Mercurial > hg > graal-compiler
annotate src/share/vm/opto/library_call.cpp @ 404:78c058bc5cdc
6717150: improper constant folding of subnormal strictfp multiplications and divides
Summary: suppress constant folding of double divides and multiplications on ia32
Reviewed-by: never
author | rasbold |
---|---|
date | Tue, 14 Oct 2008 06:58:58 -0700 |
parents | 9c2ecc2ffb12 |
children | a1980da045cc |
rev | line source |
---|---|
0 | 1 /* |
196 | 2 * Copyright 1999-2008 Sun Microsystems, Inc. All Rights Reserved. |
0 | 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
4 * | |
5 * This code is free software; you can redistribute it and/or modify it | |
6 * under the terms of the GNU General Public License version 2 only, as | |
7 * published by the Free Software Foundation. | |
8 * | |
9 * This code is distributed in the hope that it will be useful, but WITHOUT | |
10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
12 * version 2 for more details (a copy is included in the LICENSE file that | |
13 * accompanied this code). | |
14 * | |
15 * You should have received a copy of the GNU General Public License version | |
16 * 2 along with this work; if not, write to the Free Software Foundation, | |
17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
18 * | |
19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, | |
20 * CA 95054 USA or visit www.sun.com if you need additional information or | |
21 * have any questions. | |
22 * | |
23 */ | |
24 | |
25 #include "incls/_precompiled.incl" | |
26 #include "incls/_library_call.cpp.incl" | |
27 | |
28 class LibraryIntrinsic : public InlineCallGenerator { | |
29 // Extend the set of intrinsics known to the runtime: | |
30 public: | |
31 private: | |
32 bool _is_virtual; | |
33 vmIntrinsics::ID _intrinsic_id; | |
34 | |
35 public: | |
36 LibraryIntrinsic(ciMethod* m, bool is_virtual, vmIntrinsics::ID id) | |
37 : InlineCallGenerator(m), | |
38 _is_virtual(is_virtual), | |
39 _intrinsic_id(id) | |
40 { | |
41 } | |
42 virtual bool is_intrinsic() const { return true; } | |
43 virtual bool is_virtual() const { return _is_virtual; } | |
44 virtual JVMState* generate(JVMState* jvms); | |
45 vmIntrinsics::ID intrinsic_id() const { return _intrinsic_id; } | |
46 }; | |
47 | |
48 | |
49 // Local helper class for LibraryIntrinsic: | |
50 class LibraryCallKit : public GraphKit { | |
51 private: | |
52 LibraryIntrinsic* _intrinsic; // the library intrinsic being called | |
53 | |
54 public: | |
55 LibraryCallKit(JVMState* caller, LibraryIntrinsic* intrinsic) | |
56 : GraphKit(caller), | |
57 _intrinsic(intrinsic) | |
58 { | |
59 } | |
60 | |
61 ciMethod* caller() const { return jvms()->method(); } | |
62 int bci() const { return jvms()->bci(); } | |
63 LibraryIntrinsic* intrinsic() const { return _intrinsic; } | |
64 vmIntrinsics::ID intrinsic_id() const { return _intrinsic->intrinsic_id(); } | |
65 ciMethod* callee() const { return _intrinsic->method(); } | |
66 ciSignature* signature() const { return callee()->signature(); } | |
67 int arg_size() const { return callee()->arg_size(); } | |
68 | |
69 bool try_to_inline(); | |
70 | |
71 // Helper functions to inline natives | |
72 void push_result(RegionNode* region, PhiNode* value); | |
73 Node* generate_guard(Node* test, RegionNode* region, float true_prob); | |
74 Node* generate_slow_guard(Node* test, RegionNode* region); | |
75 Node* generate_fair_guard(Node* test, RegionNode* region); | |
76 Node* generate_negative_guard(Node* index, RegionNode* region, | |
77 // resulting CastII of index: | |
78 Node* *pos_index = NULL); | |
79 Node* generate_nonpositive_guard(Node* index, bool never_negative, | |
80 // resulting CastII of index: | |
81 Node* *pos_index = NULL); | |
82 Node* generate_limit_guard(Node* offset, Node* subseq_length, | |
83 Node* array_length, | |
84 RegionNode* region); | |
85 Node* generate_current_thread(Node* &tls_output); | |
86 address basictype2arraycopy(BasicType t, Node *src_offset, Node *dest_offset, | |
87 bool disjoint_bases, const char* &name); | |
88 Node* load_mirror_from_klass(Node* klass); | |
89 Node* load_klass_from_mirror_common(Node* mirror, bool never_see_null, | |
90 int nargs, | |
91 RegionNode* region, int null_path, | |
92 int offset); | |
93 Node* load_klass_from_mirror(Node* mirror, bool never_see_null, int nargs, | |
94 RegionNode* region, int null_path) { | |
95 int offset = java_lang_Class::klass_offset_in_bytes(); | |
96 return load_klass_from_mirror_common(mirror, never_see_null, nargs, | |
97 region, null_path, | |
98 offset); | |
99 } | |
100 Node* load_array_klass_from_mirror(Node* mirror, bool never_see_null, | |
101 int nargs, | |
102 RegionNode* region, int null_path) { | |
103 int offset = java_lang_Class::array_klass_offset_in_bytes(); | |
104 return load_klass_from_mirror_common(mirror, never_see_null, nargs, | |
105 region, null_path, | |
106 offset); | |
107 } | |
108 Node* generate_access_flags_guard(Node* kls, | |
109 int modifier_mask, int modifier_bits, | |
110 RegionNode* region); | |
111 Node* generate_interface_guard(Node* kls, RegionNode* region); | |
112 Node* generate_array_guard(Node* kls, RegionNode* region) { | |
113 return generate_array_guard_common(kls, region, false, false); | |
114 } | |
115 Node* generate_non_array_guard(Node* kls, RegionNode* region) { | |
116 return generate_array_guard_common(kls, region, false, true); | |
117 } | |
118 Node* generate_objArray_guard(Node* kls, RegionNode* region) { | |
119 return generate_array_guard_common(kls, region, true, false); | |
120 } | |
121 Node* generate_non_objArray_guard(Node* kls, RegionNode* region) { | |
122 return generate_array_guard_common(kls, region, true, true); | |
123 } | |
124 Node* generate_array_guard_common(Node* kls, RegionNode* region, | |
125 bool obj_array, bool not_array); | |
126 Node* generate_virtual_guard(Node* obj_klass, RegionNode* slow_region); | |
127 CallJavaNode* generate_method_call(vmIntrinsics::ID method_id, | |
128 bool is_virtual = false, bool is_static = false); | |
129 CallJavaNode* generate_method_call_static(vmIntrinsics::ID method_id) { | |
130 return generate_method_call(method_id, false, true); | |
131 } | |
132 CallJavaNode* generate_method_call_virtual(vmIntrinsics::ID method_id) { | |
133 return generate_method_call(method_id, true, false); | |
134 } | |
135 | |
136 bool inline_string_compareTo(); | |
137 bool inline_string_indexOf(); | |
138 Node* string_indexOf(Node* string_object, ciTypeArray* target_array, jint offset, jint cache_i, jint md2_i); | |
139 Node* pop_math_arg(); | |
140 bool runtime_math(const TypeFunc* call_type, address funcAddr, const char* funcName); | |
141 bool inline_math_native(vmIntrinsics::ID id); | |
142 bool inline_trig(vmIntrinsics::ID id); | |
143 bool inline_trans(vmIntrinsics::ID id); | |
144 bool inline_abs(vmIntrinsics::ID id); | |
145 bool inline_sqrt(vmIntrinsics::ID id); | |
146 bool inline_pow(vmIntrinsics::ID id); | |
147 bool inline_exp(vmIntrinsics::ID id); | |
148 bool inline_min_max(vmIntrinsics::ID id); | |
149 Node* generate_min_max(vmIntrinsics::ID id, Node* x, Node* y); | |
150 // This returns Type::AnyPtr, RawPtr, or OopPtr. | |
151 int classify_unsafe_addr(Node* &base, Node* &offset); | |
152 Node* make_unsafe_address(Node* base, Node* offset); | |
153 bool inline_unsafe_access(bool is_native_ptr, bool is_store, BasicType type, bool is_volatile); | |
154 bool inline_unsafe_prefetch(bool is_native_ptr, bool is_store, bool is_static); | |
155 bool inline_unsafe_allocate(); | |
156 bool inline_unsafe_copyMemory(); | |
157 bool inline_native_currentThread(); | |
158 bool inline_native_time_funcs(bool isNano); | |
159 bool inline_native_isInterrupted(); | |
160 bool inline_native_Class_query(vmIntrinsics::ID id); | |
161 bool inline_native_subtype_check(); | |
162 | |
163 bool inline_native_newArray(); | |
164 bool inline_native_getLength(); | |
165 bool inline_array_copyOf(bool is_copyOfRange); | |
169
9148c65abefc
6695049: (coll) Create an x86 intrinsic for Arrays.equals
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164
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166 bool inline_array_equals(); |
0 | 167 bool inline_native_clone(bool is_virtual); |
168 bool inline_native_Reflection_getCallerClass(); | |
169 bool inline_native_AtomicLong_get(); | |
170 bool inline_native_AtomicLong_attemptUpdate(); | |
171 bool is_method_invoke_or_aux_frame(JVMState* jvms); | |
172 // Helper function for inlining native object hash method | |
173 bool inline_native_hashcode(bool is_virtual, bool is_static); | |
174 bool inline_native_getClass(); | |
175 | |
176 // Helper functions for inlining arraycopy | |
177 bool inline_arraycopy(); | |
178 void generate_arraycopy(const TypePtr* adr_type, | |
179 BasicType basic_elem_type, | |
180 Node* src, Node* src_offset, | |
181 Node* dest, Node* dest_offset, | |
182 Node* copy_length, | |
183 int nargs, // arguments on stack for debug info | |
184 bool disjoint_bases = false, | |
185 bool length_never_negative = false, | |
186 RegionNode* slow_region = NULL); | |
187 AllocateArrayNode* tightly_coupled_allocation(Node* ptr, | |
188 RegionNode* slow_region); | |
189 void generate_clear_array(const TypePtr* adr_type, | |
190 Node* dest, | |
191 BasicType basic_elem_type, | |
192 Node* slice_off, | |
193 Node* slice_len, | |
194 Node* slice_end); | |
195 bool generate_block_arraycopy(const TypePtr* adr_type, | |
196 BasicType basic_elem_type, | |
197 AllocateNode* alloc, | |
198 Node* src, Node* src_offset, | |
199 Node* dest, Node* dest_offset, | |
200 Node* dest_size); | |
201 void generate_slow_arraycopy(const TypePtr* adr_type, | |
202 Node* src, Node* src_offset, | |
203 Node* dest, Node* dest_offset, | |
204 Node* copy_length, | |
205 int nargs); | |
206 Node* generate_checkcast_arraycopy(const TypePtr* adr_type, | |
207 Node* dest_elem_klass, | |
208 Node* src, Node* src_offset, | |
209 Node* dest, Node* dest_offset, | |
210 Node* copy_length, int nargs); | |
211 Node* generate_generic_arraycopy(const TypePtr* adr_type, | |
212 Node* src, Node* src_offset, | |
213 Node* dest, Node* dest_offset, | |
214 Node* copy_length, int nargs); | |
215 void generate_unchecked_arraycopy(const TypePtr* adr_type, | |
216 BasicType basic_elem_type, | |
217 bool disjoint_bases, | |
218 Node* src, Node* src_offset, | |
219 Node* dest, Node* dest_offset, | |
220 Node* copy_length); | |
221 bool inline_unsafe_CAS(BasicType type); | |
222 bool inline_unsafe_ordered_store(BasicType type); | |
223 bool inline_fp_conversions(vmIntrinsics::ID id); | |
224 bool inline_reverseBytes(vmIntrinsics::ID id); | |
225 }; | |
226 | |
227 | |
228 //---------------------------make_vm_intrinsic---------------------------- | |
229 CallGenerator* Compile::make_vm_intrinsic(ciMethod* m, bool is_virtual) { | |
230 vmIntrinsics::ID id = m->intrinsic_id(); | |
231 assert(id != vmIntrinsics::_none, "must be a VM intrinsic"); | |
232 | |
233 if (DisableIntrinsic[0] != '\0' | |
234 && strstr(DisableIntrinsic, vmIntrinsics::name_at(id)) != NULL) { | |
235 // disabled by a user request on the command line: | |
236 // example: -XX:DisableIntrinsic=_hashCode,_getClass | |
237 return NULL; | |
238 } | |
239 | |
240 if (!m->is_loaded()) { | |
241 // do not attempt to inline unloaded methods | |
242 return NULL; | |
243 } | |
244 | |
245 // Only a few intrinsics implement a virtual dispatch. | |
246 // They are expensive calls which are also frequently overridden. | |
247 if (is_virtual) { | |
248 switch (id) { | |
249 case vmIntrinsics::_hashCode: | |
250 case vmIntrinsics::_clone: | |
251 // OK, Object.hashCode and Object.clone intrinsics come in both flavors | |
252 break; | |
253 default: | |
254 return NULL; | |
255 } | |
256 } | |
257 | |
258 // -XX:-InlineNatives disables nearly all intrinsics: | |
259 if (!InlineNatives) { | |
260 switch (id) { | |
261 case vmIntrinsics::_indexOf: | |
262 case vmIntrinsics::_compareTo: | |
169
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263 case vmIntrinsics::_equalsC: |
0 | 264 break; // InlineNatives does not control String.compareTo |
265 default: | |
266 return NULL; | |
267 } | |
268 } | |
269 | |
270 switch (id) { | |
271 case vmIntrinsics::_compareTo: | |
272 if (!SpecialStringCompareTo) return NULL; | |
273 break; | |
274 case vmIntrinsics::_indexOf: | |
275 if (!SpecialStringIndexOf) return NULL; | |
276 break; | |
169
9148c65abefc
6695049: (coll) Create an x86 intrinsic for Arrays.equals
rasbold
parents:
164
diff
changeset
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277 case vmIntrinsics::_equalsC: |
9148c65abefc
6695049: (coll) Create an x86 intrinsic for Arrays.equals
rasbold
parents:
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278 if (!SpecialArraysEquals) return NULL; |
9148c65abefc
6695049: (coll) Create an x86 intrinsic for Arrays.equals
rasbold
parents:
164
diff
changeset
|
279 break; |
0 | 280 case vmIntrinsics::_arraycopy: |
281 if (!InlineArrayCopy) return NULL; | |
282 break; | |
283 case vmIntrinsics::_copyMemory: | |
284 if (StubRoutines::unsafe_arraycopy() == NULL) return NULL; | |
285 if (!InlineArrayCopy) return NULL; | |
286 break; | |
287 case vmIntrinsics::_hashCode: | |
288 if (!InlineObjectHash) return NULL; | |
289 break; | |
290 case vmIntrinsics::_clone: | |
291 case vmIntrinsics::_copyOf: | |
292 case vmIntrinsics::_copyOfRange: | |
293 if (!InlineObjectCopy) return NULL; | |
294 // These also use the arraycopy intrinsic mechanism: | |
295 if (!InlineArrayCopy) return NULL; | |
296 break; | |
297 case vmIntrinsics::_checkIndex: | |
298 // We do not intrinsify this. The optimizer does fine with it. | |
299 return NULL; | |
300 | |
301 case vmIntrinsics::_get_AtomicLong: | |
302 case vmIntrinsics::_attemptUpdate: | |
303 if (!InlineAtomicLong) return NULL; | |
304 break; | |
305 | |
306 case vmIntrinsics::_Object_init: | |
307 case vmIntrinsics::_invoke: | |
308 // We do not intrinsify these; they are marked for other purposes. | |
309 return NULL; | |
310 | |
311 case vmIntrinsics::_getCallerClass: | |
312 if (!UseNewReflection) return NULL; | |
313 if (!InlineReflectionGetCallerClass) return NULL; | |
314 if (!JDK_Version::is_gte_jdk14x_version()) return NULL; | |
315 break; | |
316 | |
317 default: | |
318 break; | |
319 } | |
320 | |
321 // -XX:-InlineClassNatives disables natives from the Class class. | |
322 // The flag applies to all reflective calls, notably Array.newArray | |
323 // (visible to Java programmers as Array.newInstance). | |
324 if (m->holder()->name() == ciSymbol::java_lang_Class() || | |
325 m->holder()->name() == ciSymbol::java_lang_reflect_Array()) { | |
326 if (!InlineClassNatives) return NULL; | |
327 } | |
328 | |
329 // -XX:-InlineThreadNatives disables natives from the Thread class. | |
330 if (m->holder()->name() == ciSymbol::java_lang_Thread()) { | |
331 if (!InlineThreadNatives) return NULL; | |
332 } | |
333 | |
334 // -XX:-InlineMathNatives disables natives from the Math,Float and Double classes. | |
335 if (m->holder()->name() == ciSymbol::java_lang_Math() || | |
336 m->holder()->name() == ciSymbol::java_lang_Float() || | |
337 m->holder()->name() == ciSymbol::java_lang_Double()) { | |
338 if (!InlineMathNatives) return NULL; | |
339 } | |
340 | |
341 // -XX:-InlineUnsafeOps disables natives from the Unsafe class. | |
342 if (m->holder()->name() == ciSymbol::sun_misc_Unsafe()) { | |
343 if (!InlineUnsafeOps) return NULL; | |
344 } | |
345 | |
346 return new LibraryIntrinsic(m, is_virtual, (vmIntrinsics::ID) id); | |
347 } | |
348 | |
349 //----------------------register_library_intrinsics----------------------- | |
350 // Initialize this file's data structures, for each Compile instance. | |
351 void Compile::register_library_intrinsics() { | |
352 // Nothing to do here. | |
353 } | |
354 | |
355 JVMState* LibraryIntrinsic::generate(JVMState* jvms) { | |
356 LibraryCallKit kit(jvms, this); | |
357 Compile* C = kit.C; | |
358 int nodes = C->unique(); | |
359 #ifndef PRODUCT | |
360 if ((PrintIntrinsics || PrintInlining NOT_PRODUCT( || PrintOptoInlining) ) && Verbose) { | |
361 char buf[1000]; | |
362 const char* str = vmIntrinsics::short_name_as_C_string(intrinsic_id(), buf, sizeof(buf)); | |
363 tty->print_cr("Intrinsic %s", str); | |
364 } | |
365 #endif | |
366 if (kit.try_to_inline()) { | |
367 if (PrintIntrinsics || PrintInlining NOT_PRODUCT( || PrintOptoInlining) ) { | |
368 tty->print("Inlining intrinsic %s%s at bci:%d in", | |
369 vmIntrinsics::name_at(intrinsic_id()), | |
370 (is_virtual() ? " (virtual)" : ""), kit.bci()); | |
371 kit.caller()->print_short_name(tty); | |
372 tty->print_cr(" (%d bytes)", kit.caller()->code_size()); | |
373 } | |
374 C->gather_intrinsic_statistics(intrinsic_id(), is_virtual(), Compile::_intrinsic_worked); | |
375 if (C->log()) { | |
376 C->log()->elem("intrinsic id='%s'%s nodes='%d'", | |
377 vmIntrinsics::name_at(intrinsic_id()), | |
378 (is_virtual() ? " virtual='1'" : ""), | |
379 C->unique() - nodes); | |
380 } | |
381 return kit.transfer_exceptions_into_jvms(); | |
382 } | |
383 | |
384 if (PrintIntrinsics) { | |
385 switch (intrinsic_id()) { | |
386 case vmIntrinsics::_invoke: | |
387 case vmIntrinsics::_Object_init: | |
388 // We do not expect to inline these, so do not produce any noise about them. | |
389 break; | |
390 default: | |
391 tty->print("Did not inline intrinsic %s%s at bci:%d in", | |
392 vmIntrinsics::name_at(intrinsic_id()), | |
393 (is_virtual() ? " (virtual)" : ""), kit.bci()); | |
394 kit.caller()->print_short_name(tty); | |
395 tty->print_cr(" (%d bytes)", kit.caller()->code_size()); | |
396 } | |
397 } | |
398 C->gather_intrinsic_statistics(intrinsic_id(), is_virtual(), Compile::_intrinsic_failed); | |
399 return NULL; | |
400 } | |
401 | |
402 bool LibraryCallKit::try_to_inline() { | |
403 // Handle symbolic names for otherwise undistinguished boolean switches: | |
404 const bool is_store = true; | |
405 const bool is_native_ptr = true; | |
406 const bool is_static = true; | |
407 | |
408 switch (intrinsic_id()) { | |
409 case vmIntrinsics::_hashCode: | |
410 return inline_native_hashcode(intrinsic()->is_virtual(), !is_static); | |
411 case vmIntrinsics::_identityHashCode: | |
412 return inline_native_hashcode(/*!virtual*/ false, is_static); | |
413 case vmIntrinsics::_getClass: | |
414 return inline_native_getClass(); | |
415 | |
416 case vmIntrinsics::_dsin: | |
417 case vmIntrinsics::_dcos: | |
418 case vmIntrinsics::_dtan: | |
419 case vmIntrinsics::_dabs: | |
420 case vmIntrinsics::_datan2: | |
421 case vmIntrinsics::_dsqrt: | |
422 case vmIntrinsics::_dexp: | |
423 case vmIntrinsics::_dlog: | |
424 case vmIntrinsics::_dlog10: | |
425 case vmIntrinsics::_dpow: | |
426 return inline_math_native(intrinsic_id()); | |
427 | |
428 case vmIntrinsics::_min: | |
429 case vmIntrinsics::_max: | |
430 return inline_min_max(intrinsic_id()); | |
431 | |
432 case vmIntrinsics::_arraycopy: | |
433 return inline_arraycopy(); | |
434 | |
435 case vmIntrinsics::_compareTo: | |
436 return inline_string_compareTo(); | |
437 case vmIntrinsics::_indexOf: | |
438 return inline_string_indexOf(); | |
439 | |
440 case vmIntrinsics::_getObject: | |
441 return inline_unsafe_access(!is_native_ptr, !is_store, T_OBJECT, false); | |
442 case vmIntrinsics::_getBoolean: | |
443 return inline_unsafe_access(!is_native_ptr, !is_store, T_BOOLEAN, false); | |
444 case vmIntrinsics::_getByte: | |
445 return inline_unsafe_access(!is_native_ptr, !is_store, T_BYTE, false); | |
446 case vmIntrinsics::_getShort: | |
447 return inline_unsafe_access(!is_native_ptr, !is_store, T_SHORT, false); | |
448 case vmIntrinsics::_getChar: | |
449 return inline_unsafe_access(!is_native_ptr, !is_store, T_CHAR, false); | |
450 case vmIntrinsics::_getInt: | |
451 return inline_unsafe_access(!is_native_ptr, !is_store, T_INT, false); | |
452 case vmIntrinsics::_getLong: | |
453 return inline_unsafe_access(!is_native_ptr, !is_store, T_LONG, false); | |
454 case vmIntrinsics::_getFloat: | |
455 return inline_unsafe_access(!is_native_ptr, !is_store, T_FLOAT, false); | |
456 case vmIntrinsics::_getDouble: | |
457 return inline_unsafe_access(!is_native_ptr, !is_store, T_DOUBLE, false); | |
458 | |
459 case vmIntrinsics::_putObject: | |
460 return inline_unsafe_access(!is_native_ptr, is_store, T_OBJECT, false); | |
461 case vmIntrinsics::_putBoolean: | |
462 return inline_unsafe_access(!is_native_ptr, is_store, T_BOOLEAN, false); | |
463 case vmIntrinsics::_putByte: | |
464 return inline_unsafe_access(!is_native_ptr, is_store, T_BYTE, false); | |
465 case vmIntrinsics::_putShort: | |
466 return inline_unsafe_access(!is_native_ptr, is_store, T_SHORT, false); | |
467 case vmIntrinsics::_putChar: | |
468 return inline_unsafe_access(!is_native_ptr, is_store, T_CHAR, false); | |
469 case vmIntrinsics::_putInt: | |
470 return inline_unsafe_access(!is_native_ptr, is_store, T_INT, false); | |
471 case vmIntrinsics::_putLong: | |
472 return inline_unsafe_access(!is_native_ptr, is_store, T_LONG, false); | |
473 case vmIntrinsics::_putFloat: | |
474 return inline_unsafe_access(!is_native_ptr, is_store, T_FLOAT, false); | |
475 case vmIntrinsics::_putDouble: | |
476 return inline_unsafe_access(!is_native_ptr, is_store, T_DOUBLE, false); | |
477 | |
478 case vmIntrinsics::_getByte_raw: | |
479 return inline_unsafe_access(is_native_ptr, !is_store, T_BYTE, false); | |
480 case vmIntrinsics::_getShort_raw: | |
481 return inline_unsafe_access(is_native_ptr, !is_store, T_SHORT, false); | |
482 case vmIntrinsics::_getChar_raw: | |
483 return inline_unsafe_access(is_native_ptr, !is_store, T_CHAR, false); | |
484 case vmIntrinsics::_getInt_raw: | |
485 return inline_unsafe_access(is_native_ptr, !is_store, T_INT, false); | |
486 case vmIntrinsics::_getLong_raw: | |
487 return inline_unsafe_access(is_native_ptr, !is_store, T_LONG, false); | |
488 case vmIntrinsics::_getFloat_raw: | |
489 return inline_unsafe_access(is_native_ptr, !is_store, T_FLOAT, false); | |
490 case vmIntrinsics::_getDouble_raw: | |
491 return inline_unsafe_access(is_native_ptr, !is_store, T_DOUBLE, false); | |
492 case vmIntrinsics::_getAddress_raw: | |
493 return inline_unsafe_access(is_native_ptr, !is_store, T_ADDRESS, false); | |
494 | |
495 case vmIntrinsics::_putByte_raw: | |
496 return inline_unsafe_access(is_native_ptr, is_store, T_BYTE, false); | |
497 case vmIntrinsics::_putShort_raw: | |
498 return inline_unsafe_access(is_native_ptr, is_store, T_SHORT, false); | |
499 case vmIntrinsics::_putChar_raw: | |
500 return inline_unsafe_access(is_native_ptr, is_store, T_CHAR, false); | |
501 case vmIntrinsics::_putInt_raw: | |
502 return inline_unsafe_access(is_native_ptr, is_store, T_INT, false); | |
503 case vmIntrinsics::_putLong_raw: | |
504 return inline_unsafe_access(is_native_ptr, is_store, T_LONG, false); | |
505 case vmIntrinsics::_putFloat_raw: | |
506 return inline_unsafe_access(is_native_ptr, is_store, T_FLOAT, false); | |
507 case vmIntrinsics::_putDouble_raw: | |
508 return inline_unsafe_access(is_native_ptr, is_store, T_DOUBLE, false); | |
509 case vmIntrinsics::_putAddress_raw: | |
510 return inline_unsafe_access(is_native_ptr, is_store, T_ADDRESS, false); | |
511 | |
512 case vmIntrinsics::_getObjectVolatile: | |
513 return inline_unsafe_access(!is_native_ptr, !is_store, T_OBJECT, true); | |
514 case vmIntrinsics::_getBooleanVolatile: | |
515 return inline_unsafe_access(!is_native_ptr, !is_store, T_BOOLEAN, true); | |
516 case vmIntrinsics::_getByteVolatile: | |
517 return inline_unsafe_access(!is_native_ptr, !is_store, T_BYTE, true); | |
518 case vmIntrinsics::_getShortVolatile: | |
519 return inline_unsafe_access(!is_native_ptr, !is_store, T_SHORT, true); | |
520 case vmIntrinsics::_getCharVolatile: | |
521 return inline_unsafe_access(!is_native_ptr, !is_store, T_CHAR, true); | |
522 case vmIntrinsics::_getIntVolatile: | |
523 return inline_unsafe_access(!is_native_ptr, !is_store, T_INT, true); | |
524 case vmIntrinsics::_getLongVolatile: | |
525 return inline_unsafe_access(!is_native_ptr, !is_store, T_LONG, true); | |
526 case vmIntrinsics::_getFloatVolatile: | |
527 return inline_unsafe_access(!is_native_ptr, !is_store, T_FLOAT, true); | |
528 case vmIntrinsics::_getDoubleVolatile: | |
529 return inline_unsafe_access(!is_native_ptr, !is_store, T_DOUBLE, true); | |
530 | |
531 case vmIntrinsics::_putObjectVolatile: | |
532 return inline_unsafe_access(!is_native_ptr, is_store, T_OBJECT, true); | |
533 case vmIntrinsics::_putBooleanVolatile: | |
534 return inline_unsafe_access(!is_native_ptr, is_store, T_BOOLEAN, true); | |
535 case vmIntrinsics::_putByteVolatile: | |
536 return inline_unsafe_access(!is_native_ptr, is_store, T_BYTE, true); | |
537 case vmIntrinsics::_putShortVolatile: | |
538 return inline_unsafe_access(!is_native_ptr, is_store, T_SHORT, true); | |
539 case vmIntrinsics::_putCharVolatile: | |
540 return inline_unsafe_access(!is_native_ptr, is_store, T_CHAR, true); | |
541 case vmIntrinsics::_putIntVolatile: | |
542 return inline_unsafe_access(!is_native_ptr, is_store, T_INT, true); | |
543 case vmIntrinsics::_putLongVolatile: | |
544 return inline_unsafe_access(!is_native_ptr, is_store, T_LONG, true); | |
545 case vmIntrinsics::_putFloatVolatile: | |
546 return inline_unsafe_access(!is_native_ptr, is_store, T_FLOAT, true); | |
547 case vmIntrinsics::_putDoubleVolatile: | |
548 return inline_unsafe_access(!is_native_ptr, is_store, T_DOUBLE, true); | |
549 | |
550 case vmIntrinsics::_prefetchRead: | |
551 return inline_unsafe_prefetch(!is_native_ptr, !is_store, !is_static); | |
552 case vmIntrinsics::_prefetchWrite: | |
553 return inline_unsafe_prefetch(!is_native_ptr, is_store, !is_static); | |
554 case vmIntrinsics::_prefetchReadStatic: | |
555 return inline_unsafe_prefetch(!is_native_ptr, !is_store, is_static); | |
556 case vmIntrinsics::_prefetchWriteStatic: | |
557 return inline_unsafe_prefetch(!is_native_ptr, is_store, is_static); | |
558 | |
559 case vmIntrinsics::_compareAndSwapObject: | |
560 return inline_unsafe_CAS(T_OBJECT); | |
561 case vmIntrinsics::_compareAndSwapInt: | |
562 return inline_unsafe_CAS(T_INT); | |
563 case vmIntrinsics::_compareAndSwapLong: | |
564 return inline_unsafe_CAS(T_LONG); | |
565 | |
566 case vmIntrinsics::_putOrderedObject: | |
567 return inline_unsafe_ordered_store(T_OBJECT); | |
568 case vmIntrinsics::_putOrderedInt: | |
569 return inline_unsafe_ordered_store(T_INT); | |
570 case vmIntrinsics::_putOrderedLong: | |
571 return inline_unsafe_ordered_store(T_LONG); | |
572 | |
573 case vmIntrinsics::_currentThread: | |
574 return inline_native_currentThread(); | |
575 case vmIntrinsics::_isInterrupted: | |
576 return inline_native_isInterrupted(); | |
577 | |
578 case vmIntrinsics::_currentTimeMillis: | |
579 return inline_native_time_funcs(false); | |
580 case vmIntrinsics::_nanoTime: | |
581 return inline_native_time_funcs(true); | |
582 case vmIntrinsics::_allocateInstance: | |
583 return inline_unsafe_allocate(); | |
584 case vmIntrinsics::_copyMemory: | |
585 return inline_unsafe_copyMemory(); | |
586 case vmIntrinsics::_newArray: | |
587 return inline_native_newArray(); | |
588 case vmIntrinsics::_getLength: | |
589 return inline_native_getLength(); | |
590 case vmIntrinsics::_copyOf: | |
591 return inline_array_copyOf(false); | |
592 case vmIntrinsics::_copyOfRange: | |
593 return inline_array_copyOf(true); | |
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594 case vmIntrinsics::_equalsC: |
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595 return inline_array_equals(); |
0 | 596 case vmIntrinsics::_clone: |
597 return inline_native_clone(intrinsic()->is_virtual()); | |
598 | |
599 case vmIntrinsics::_isAssignableFrom: | |
600 return inline_native_subtype_check(); | |
601 | |
602 case vmIntrinsics::_isInstance: | |
603 case vmIntrinsics::_getModifiers: | |
604 case vmIntrinsics::_isInterface: | |
605 case vmIntrinsics::_isArray: | |
606 case vmIntrinsics::_isPrimitive: | |
607 case vmIntrinsics::_getSuperclass: | |
608 case vmIntrinsics::_getComponentType: | |
609 case vmIntrinsics::_getClassAccessFlags: | |
610 return inline_native_Class_query(intrinsic_id()); | |
611 | |
612 case vmIntrinsics::_floatToRawIntBits: | |
613 case vmIntrinsics::_floatToIntBits: | |
614 case vmIntrinsics::_intBitsToFloat: | |
615 case vmIntrinsics::_doubleToRawLongBits: | |
616 case vmIntrinsics::_doubleToLongBits: | |
617 case vmIntrinsics::_longBitsToDouble: | |
618 return inline_fp_conversions(intrinsic_id()); | |
619 | |
620 case vmIntrinsics::_reverseBytes_i: | |
621 case vmIntrinsics::_reverseBytes_l: | |
622 return inline_reverseBytes((vmIntrinsics::ID) intrinsic_id()); | |
623 | |
624 case vmIntrinsics::_get_AtomicLong: | |
625 return inline_native_AtomicLong_get(); | |
626 case vmIntrinsics::_attemptUpdate: | |
627 return inline_native_AtomicLong_attemptUpdate(); | |
628 | |
629 case vmIntrinsics::_getCallerClass: | |
630 return inline_native_Reflection_getCallerClass(); | |
631 | |
632 default: | |
633 // If you get here, it may be that someone has added a new intrinsic | |
634 // to the list in vmSymbols.hpp without implementing it here. | |
635 #ifndef PRODUCT | |
636 if ((PrintMiscellaneous && (Verbose || WizardMode)) || PrintOpto) { | |
637 tty->print_cr("*** Warning: Unimplemented intrinsic %s(%d)", | |
638 vmIntrinsics::name_at(intrinsic_id()), intrinsic_id()); | |
639 } | |
640 #endif | |
641 return false; | |
642 } | |
643 } | |
644 | |
645 //------------------------------push_result------------------------------ | |
646 // Helper function for finishing intrinsics. | |
647 void LibraryCallKit::push_result(RegionNode* region, PhiNode* value) { | |
648 record_for_igvn(region); | |
649 set_control(_gvn.transform(region)); | |
650 BasicType value_type = value->type()->basic_type(); | |
651 push_node(value_type, _gvn.transform(value)); | |
652 } | |
653 | |
654 //------------------------------generate_guard--------------------------- | |
655 // Helper function for generating guarded fast-slow graph structures. | |
656 // The given 'test', if true, guards a slow path. If the test fails | |
657 // then a fast path can be taken. (We generally hope it fails.) | |
658 // In all cases, GraphKit::control() is updated to the fast path. | |
659 // The returned value represents the control for the slow path. | |
660 // The return value is never 'top'; it is either a valid control | |
661 // or NULL if it is obvious that the slow path can never be taken. | |
662 // Also, if region and the slow control are not NULL, the slow edge | |
663 // is appended to the region. | |
664 Node* LibraryCallKit::generate_guard(Node* test, RegionNode* region, float true_prob) { | |
665 if (stopped()) { | |
666 // Already short circuited. | |
667 return NULL; | |
668 } | |
669 | |
670 // Build an if node and its projections. | |
671 // If test is true we take the slow path, which we assume is uncommon. | |
672 if (_gvn.type(test) == TypeInt::ZERO) { | |
673 // The slow branch is never taken. No need to build this guard. | |
674 return NULL; | |
675 } | |
676 | |
677 IfNode* iff = create_and_map_if(control(), test, true_prob, COUNT_UNKNOWN); | |
678 | |
679 Node* if_slow = _gvn.transform( new (C, 1) IfTrueNode(iff) ); | |
680 if (if_slow == top()) { | |
681 // The slow branch is never taken. No need to build this guard. | |
682 return NULL; | |
683 } | |
684 | |
685 if (region != NULL) | |
686 region->add_req(if_slow); | |
687 | |
688 Node* if_fast = _gvn.transform( new (C, 1) IfFalseNode(iff) ); | |
689 set_control(if_fast); | |
690 | |
691 return if_slow; | |
692 } | |
693 | |
694 inline Node* LibraryCallKit::generate_slow_guard(Node* test, RegionNode* region) { | |
695 return generate_guard(test, region, PROB_UNLIKELY_MAG(3)); | |
696 } | |
697 inline Node* LibraryCallKit::generate_fair_guard(Node* test, RegionNode* region) { | |
698 return generate_guard(test, region, PROB_FAIR); | |
699 } | |
700 | |
701 inline Node* LibraryCallKit::generate_negative_guard(Node* index, RegionNode* region, | |
702 Node* *pos_index) { | |
703 if (stopped()) | |
704 return NULL; // already stopped | |
705 if (_gvn.type(index)->higher_equal(TypeInt::POS)) // [0,maxint] | |
706 return NULL; // index is already adequately typed | |
707 Node* cmp_lt = _gvn.transform( new (C, 3) CmpINode(index, intcon(0)) ); | |
708 Node* bol_lt = _gvn.transform( new (C, 2) BoolNode(cmp_lt, BoolTest::lt) ); | |
709 Node* is_neg = generate_guard(bol_lt, region, PROB_MIN); | |
710 if (is_neg != NULL && pos_index != NULL) { | |
711 // Emulate effect of Parse::adjust_map_after_if. | |
712 Node* ccast = new (C, 2) CastIINode(index, TypeInt::POS); | |
713 ccast->set_req(0, control()); | |
714 (*pos_index) = _gvn.transform(ccast); | |
715 } | |
716 return is_neg; | |
717 } | |
718 | |
719 inline Node* LibraryCallKit::generate_nonpositive_guard(Node* index, bool never_negative, | |
720 Node* *pos_index) { | |
721 if (stopped()) | |
722 return NULL; // already stopped | |
723 if (_gvn.type(index)->higher_equal(TypeInt::POS1)) // [1,maxint] | |
724 return NULL; // index is already adequately typed | |
725 Node* cmp_le = _gvn.transform( new (C, 3) CmpINode(index, intcon(0)) ); | |
726 BoolTest::mask le_or_eq = (never_negative ? BoolTest::eq : BoolTest::le); | |
727 Node* bol_le = _gvn.transform( new (C, 2) BoolNode(cmp_le, le_or_eq) ); | |
728 Node* is_notp = generate_guard(bol_le, NULL, PROB_MIN); | |
729 if (is_notp != NULL && pos_index != NULL) { | |
730 // Emulate effect of Parse::adjust_map_after_if. | |
731 Node* ccast = new (C, 2) CastIINode(index, TypeInt::POS1); | |
732 ccast->set_req(0, control()); | |
733 (*pos_index) = _gvn.transform(ccast); | |
734 } | |
735 return is_notp; | |
736 } | |
737 | |
738 // Make sure that 'position' is a valid limit index, in [0..length]. | |
739 // There are two equivalent plans for checking this: | |
740 // A. (offset + copyLength) unsigned<= arrayLength | |
741 // B. offset <= (arrayLength - copyLength) | |
742 // We require that all of the values above, except for the sum and | |
743 // difference, are already known to be non-negative. | |
744 // Plan A is robust in the face of overflow, if offset and copyLength | |
745 // are both hugely positive. | |
746 // | |
747 // Plan B is less direct and intuitive, but it does not overflow at | |
748 // all, since the difference of two non-negatives is always | |
749 // representable. Whenever Java methods must perform the equivalent | |
750 // check they generally use Plan B instead of Plan A. | |
751 // For the moment we use Plan A. | |
752 inline Node* LibraryCallKit::generate_limit_guard(Node* offset, | |
753 Node* subseq_length, | |
754 Node* array_length, | |
755 RegionNode* region) { | |
756 if (stopped()) | |
757 return NULL; // already stopped | |
758 bool zero_offset = _gvn.type(offset) == TypeInt::ZERO; | |
759 if (zero_offset && _gvn.eqv_uncast(subseq_length, array_length)) | |
760 return NULL; // common case of whole-array copy | |
761 Node* last = subseq_length; | |
762 if (!zero_offset) // last += offset | |
763 last = _gvn.transform( new (C, 3) AddINode(last, offset)); | |
764 Node* cmp_lt = _gvn.transform( new (C, 3) CmpUNode(array_length, last) ); | |
765 Node* bol_lt = _gvn.transform( new (C, 2) BoolNode(cmp_lt, BoolTest::lt) ); | |
766 Node* is_over = generate_guard(bol_lt, region, PROB_MIN); | |
767 return is_over; | |
768 } | |
769 | |
770 | |
771 //--------------------------generate_current_thread-------------------- | |
772 Node* LibraryCallKit::generate_current_thread(Node* &tls_output) { | |
773 ciKlass* thread_klass = env()->Thread_klass(); | |
774 const Type* thread_type = TypeOopPtr::make_from_klass(thread_klass)->cast_to_ptr_type(TypePtr::NotNull); | |
775 Node* thread = _gvn.transform(new (C, 1) ThreadLocalNode()); | |
776 Node* p = basic_plus_adr(top()/*!oop*/, thread, in_bytes(JavaThread::threadObj_offset())); | |
777 Node* threadObj = make_load(NULL, p, thread_type, T_OBJECT); | |
778 tls_output = thread; | |
779 return threadObj; | |
780 } | |
781 | |
782 | |
783 //------------------------------inline_string_compareTo------------------------ | |
784 bool LibraryCallKit::inline_string_compareTo() { | |
785 | |
786 const int value_offset = java_lang_String::value_offset_in_bytes(); | |
787 const int count_offset = java_lang_String::count_offset_in_bytes(); | |
788 const int offset_offset = java_lang_String::offset_offset_in_bytes(); | |
789 | |
790 _sp += 2; | |
791 Node *argument = pop(); // pop non-receiver first: it was pushed second | |
792 Node *receiver = pop(); | |
793 | |
794 // Null check on self without removing any arguments. The argument | |
795 // null check technically happens in the wrong place, which can lead to | |
796 // invalid stack traces when string compare is inlined into a method | |
797 // which handles NullPointerExceptions. | |
798 _sp += 2; | |
799 receiver = do_null_check(receiver, T_OBJECT); | |
800 argument = do_null_check(argument, T_OBJECT); | |
801 _sp -= 2; | |
802 if (stopped()) { | |
803 return true; | |
804 } | |
805 | |
806 ciInstanceKlass* klass = env()->String_klass(); | |
807 const TypeInstPtr* string_type = | |
808 TypeInstPtr::make(TypePtr::BotPTR, klass, false, NULL, 0); | |
809 | |
810 Node* compare = | |
811 _gvn.transform(new (C, 7) StrCompNode( | |
812 control(), | |
813 memory(TypeAryPtr::CHARS), | |
814 memory(string_type->add_offset(value_offset)), | |
815 memory(string_type->add_offset(count_offset)), | |
816 memory(string_type->add_offset(offset_offset)), | |
817 receiver, | |
818 argument)); | |
819 push(compare); | |
820 return true; | |
821 } | |
822 | |
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823 //------------------------------inline_array_equals---------------------------- |
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824 bool LibraryCallKit::inline_array_equals() { |
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825 |
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826 if (!Matcher::has_match_rule(Op_AryEq)) return false; |
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827 |
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828 _sp += 2; |
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829 Node *argument2 = pop(); |
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830 Node *argument1 = pop(); |
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831 |
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832 Node* equals = |
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833 _gvn.transform(new (C, 3) AryEqNode(control(), |
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834 argument1, |
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835 argument2) |
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836 ); |
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837 push(equals); |
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838 return true; |
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839 } |
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840 |
0 | 841 // Java version of String.indexOf(constant string) |
842 // class StringDecl { | |
843 // StringDecl(char[] ca) { | |
844 // offset = 0; | |
845 // count = ca.length; | |
846 // value = ca; | |
847 // } | |
848 // int offset; | |
849 // int count; | |
850 // char[] value; | |
851 // } | |
852 // | |
853 // static int string_indexOf_J(StringDecl string_object, char[] target_object, | |
854 // int targetOffset, int cache_i, int md2) { | |
855 // int cache = cache_i; | |
856 // int sourceOffset = string_object.offset; | |
857 // int sourceCount = string_object.count; | |
858 // int targetCount = target_object.length; | |
859 // | |
860 // int targetCountLess1 = targetCount - 1; | |
861 // int sourceEnd = sourceOffset + sourceCount - targetCountLess1; | |
862 // | |
863 // char[] source = string_object.value; | |
864 // char[] target = target_object; | |
865 // int lastChar = target[targetCountLess1]; | |
866 // | |
867 // outer_loop: | |
868 // for (int i = sourceOffset; i < sourceEnd; ) { | |
869 // int src = source[i + targetCountLess1]; | |
870 // if (src == lastChar) { | |
871 // // With random strings and a 4-character alphabet, | |
872 // // reverse matching at this point sets up 0.8% fewer | |
873 // // frames, but (paradoxically) makes 0.3% more probes. | |
874 // // Since those probes are nearer the lastChar probe, | |
875 // // there is may be a net D$ win with reverse matching. | |
876 // // But, reversing loop inhibits unroll of inner loop | |
877 // // for unknown reason. So, does running outer loop from | |
878 // // (sourceOffset - targetCountLess1) to (sourceOffset + sourceCount) | |
879 // for (int j = 0; j < targetCountLess1; j++) { | |
880 // if (target[targetOffset + j] != source[i+j]) { | |
881 // if ((cache & (1 << source[i+j])) == 0) { | |
882 // if (md2 < j+1) { | |
883 // i += j+1; | |
884 // continue outer_loop; | |
885 // } | |
886 // } | |
887 // i += md2; | |
888 // continue outer_loop; | |
889 // } | |
890 // } | |
891 // return i - sourceOffset; | |
892 // } | |
893 // if ((cache & (1 << src)) == 0) { | |
894 // i += targetCountLess1; | |
895 // } // using "i += targetCount;" and an "else i++;" causes a jump to jump. | |
896 // i++; | |
897 // } | |
898 // return -1; | |
899 // } | |
900 | |
901 //------------------------------string_indexOf------------------------ | |
902 Node* LibraryCallKit::string_indexOf(Node* string_object, ciTypeArray* target_array, jint targetOffset_i, | |
903 jint cache_i, jint md2_i) { | |
904 | |
905 Node* no_ctrl = NULL; | |
906 float likely = PROB_LIKELY(0.9); | |
907 float unlikely = PROB_UNLIKELY(0.9); | |
908 | |
909 const int value_offset = java_lang_String::value_offset_in_bytes(); | |
910 const int count_offset = java_lang_String::count_offset_in_bytes(); | |
911 const int offset_offset = java_lang_String::offset_offset_in_bytes(); | |
912 | |
913 ciInstanceKlass* klass = env()->String_klass(); | |
914 const TypeInstPtr* string_type = TypeInstPtr::make(TypePtr::BotPTR, klass, false, NULL, 0); | |
915 const TypeAryPtr* source_type = TypeAryPtr::make(TypePtr::NotNull, TypeAry::make(TypeInt::CHAR,TypeInt::POS), ciTypeArrayKlass::make(T_CHAR), true, 0); | |
916 | |
917 Node* sourceOffseta = basic_plus_adr(string_object, string_object, offset_offset); | |
918 Node* sourceOffset = make_load(no_ctrl, sourceOffseta, TypeInt::INT, T_INT, string_type->add_offset(offset_offset)); | |
919 Node* sourceCounta = basic_plus_adr(string_object, string_object, count_offset); | |
920 Node* sourceCount = make_load(no_ctrl, sourceCounta, TypeInt::INT, T_INT, string_type->add_offset(count_offset)); | |
921 Node* sourcea = basic_plus_adr(string_object, string_object, value_offset); | |
922 Node* source = make_load(no_ctrl, sourcea, source_type, T_OBJECT, string_type->add_offset(value_offset)); | |
923 | |
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924 Node* target = _gvn.transform( makecon(TypeOopPtr::make_from_constant(target_array)) ); |
0 | 925 jint target_length = target_array->length(); |
926 const TypeAry* target_array_type = TypeAry::make(TypeInt::CHAR, TypeInt::make(0, target_length, Type::WidenMin)); | |
927 const TypeAryPtr* target_type = TypeAryPtr::make(TypePtr::BotPTR, target_array_type, target_array->klass(), true, Type::OffsetBot); | |
928 | |
929 IdealKit kit(gvn(), control(), merged_memory()); | |
930 #define __ kit. | |
931 Node* zero = __ ConI(0); | |
932 Node* one = __ ConI(1); | |
933 Node* cache = __ ConI(cache_i); | |
934 Node* md2 = __ ConI(md2_i); | |
935 Node* lastChar = __ ConI(target_array->char_at(target_length - 1)); | |
936 Node* targetCount = __ ConI(target_length); | |
937 Node* targetCountLess1 = __ ConI(target_length - 1); | |
938 Node* targetOffset = __ ConI(targetOffset_i); | |
939 Node* sourceEnd = __ SubI(__ AddI(sourceOffset, sourceCount), targetCountLess1); | |
940 | |
941 IdealVariable rtn(kit), i(kit), j(kit); __ declares_done(); | |
942 Node* outer_loop = __ make_label(2 /* goto */); | |
943 Node* return_ = __ make_label(1); | |
944 | |
945 __ set(rtn,__ ConI(-1)); | |
946 __ loop(i, sourceOffset, BoolTest::lt, sourceEnd); { | |
947 Node* i2 = __ AddI(__ value(i), targetCountLess1); | |
948 // pin to prohibit loading of "next iteration" value which may SEGV (rare) | |
949 Node* src = load_array_element(__ ctrl(), source, i2, TypeAryPtr::CHARS); | |
950 __ if_then(src, BoolTest::eq, lastChar, unlikely); { | |
951 __ loop(j, zero, BoolTest::lt, targetCountLess1); { | |
952 Node* tpj = __ AddI(targetOffset, __ value(j)); | |
953 Node* targ = load_array_element(no_ctrl, target, tpj, target_type); | |
954 Node* ipj = __ AddI(__ value(i), __ value(j)); | |
955 Node* src2 = load_array_element(no_ctrl, source, ipj, TypeAryPtr::CHARS); | |
956 __ if_then(targ, BoolTest::ne, src2); { | |
957 __ if_then(__ AndI(cache, __ LShiftI(one, src2)), BoolTest::eq, zero); { | |
958 __ if_then(md2, BoolTest::lt, __ AddI(__ value(j), one)); { | |
959 __ increment(i, __ AddI(__ value(j), one)); | |
960 __ goto_(outer_loop); | |
961 } __ end_if(); __ dead(j); | |
962 }__ end_if(); __ dead(j); | |
963 __ increment(i, md2); | |
964 __ goto_(outer_loop); | |
965 }__ end_if(); | |
966 __ increment(j, one); | |
967 }__ end_loop(); __ dead(j); | |
968 __ set(rtn, __ SubI(__ value(i), sourceOffset)); __ dead(i); | |
969 __ goto_(return_); | |
970 }__ end_if(); | |
971 __ if_then(__ AndI(cache, __ LShiftI(one, src)), BoolTest::eq, zero, likely); { | |
972 __ increment(i, targetCountLess1); | |
973 }__ end_if(); | |
974 __ increment(i, one); | |
975 __ bind(outer_loop); | |
976 }__ end_loop(); __ dead(i); | |
977 __ bind(return_); | |
978 __ drain_delay_transform(); | |
979 | |
980 set_control(__ ctrl()); | |
981 Node* result = __ value(rtn); | |
982 #undef __ | |
983 C->set_has_loops(true); | |
984 return result; | |
985 } | |
986 | |
987 | |
988 //------------------------------inline_string_indexOf------------------------ | |
989 bool LibraryCallKit::inline_string_indexOf() { | |
990 | |
991 _sp += 2; | |
992 Node *argument = pop(); // pop non-receiver first: it was pushed second | |
993 Node *receiver = pop(); | |
994 | |
995 // don't intrinsify is argument isn't a constant string. | |
996 if (!argument->is_Con()) { | |
997 return false; | |
998 } | |
999 const TypeOopPtr* str_type = _gvn.type(argument)->isa_oopptr(); | |
1000 if (str_type == NULL) { | |
1001 return false; | |
1002 } | |
1003 ciInstanceKlass* klass = env()->String_klass(); | |
1004 ciObject* str_const = str_type->const_oop(); | |
1005 if (str_const == NULL || str_const->klass() != klass) { | |
1006 return false; | |
1007 } | |
1008 ciInstance* str = str_const->as_instance(); | |
1009 assert(str != NULL, "must be instance"); | |
1010 | |
1011 const int value_offset = java_lang_String::value_offset_in_bytes(); | |
1012 const int count_offset = java_lang_String::count_offset_in_bytes(); | |
1013 const int offset_offset = java_lang_String::offset_offset_in_bytes(); | |
1014 | |
1015 ciObject* v = str->field_value_by_offset(value_offset).as_object(); | |
1016 int o = str->field_value_by_offset(offset_offset).as_int(); | |
1017 int c = str->field_value_by_offset(count_offset).as_int(); | |
1018 ciTypeArray* pat = v->as_type_array(); // pattern (argument) character array | |
1019 | |
1020 // constant strings have no offset and count == length which | |
1021 // simplifies the resulting code somewhat so lets optimize for that. | |
1022 if (o != 0 || c != pat->length()) { | |
1023 return false; | |
1024 } | |
1025 | |
1026 // Null check on self without removing any arguments. The argument | |
1027 // null check technically happens in the wrong place, which can lead to | |
1028 // invalid stack traces when string compare is inlined into a method | |
1029 // which handles NullPointerExceptions. | |
1030 _sp += 2; | |
1031 receiver = do_null_check(receiver, T_OBJECT); | |
1032 // No null check on the argument is needed since it's a constant String oop. | |
1033 _sp -= 2; | |
1034 if (stopped()) { | |
1035 return true; | |
1036 } | |
1037 | |
1038 // The null string as a pattern always returns 0 (match at beginning of string) | |
1039 if (c == 0) { | |
1040 push(intcon(0)); | |
1041 return true; | |
1042 } | |
1043 | |
1044 jchar lastChar = pat->char_at(o + (c - 1)); | |
1045 int cache = 0; | |
1046 int i; | |
1047 for (i = 0; i < c - 1; i++) { | |
1048 assert(i < pat->length(), "out of range"); | |
1049 cache |= (1 << (pat->char_at(o + i) & (sizeof(cache) * BitsPerByte - 1))); | |
1050 } | |
1051 | |
1052 int md2 = c; | |
1053 for (i = 0; i < c - 1; i++) { | |
1054 assert(i < pat->length(), "out of range"); | |
1055 if (pat->char_at(o + i) == lastChar) { | |
1056 md2 = (c - 1) - i; | |
1057 } | |
1058 } | |
1059 | |
1060 Node* result = string_indexOf(receiver, pat, o, cache, md2); | |
1061 push(result); | |
1062 return true; | |
1063 } | |
1064 | |
1065 //--------------------------pop_math_arg-------------------------------- | |
1066 // Pop a double argument to a math function from the stack | |
1067 // rounding it if necessary. | |
1068 Node * LibraryCallKit::pop_math_arg() { | |
1069 Node *arg = pop_pair(); | |
1070 if( Matcher::strict_fp_requires_explicit_rounding && UseSSE<=1 ) | |
1071 arg = _gvn.transform( new (C, 2) RoundDoubleNode(0, arg) ); | |
1072 return arg; | |
1073 } | |
1074 | |
1075 //------------------------------inline_trig---------------------------------- | |
1076 // Inline sin/cos/tan instructions, if possible. If rounding is required, do | |
1077 // argument reduction which will turn into a fast/slow diamond. | |
1078 bool LibraryCallKit::inline_trig(vmIntrinsics::ID id) { | |
1079 _sp += arg_size(); // restore stack pointer | |
1080 Node* arg = pop_math_arg(); | |
1081 Node* trig = NULL; | |
1082 | |
1083 switch (id) { | |
1084 case vmIntrinsics::_dsin: | |
1085 trig = _gvn.transform((Node*)new (C, 2) SinDNode(arg)); | |
1086 break; | |
1087 case vmIntrinsics::_dcos: | |
1088 trig = _gvn.transform((Node*)new (C, 2) CosDNode(arg)); | |
1089 break; | |
1090 case vmIntrinsics::_dtan: | |
1091 trig = _gvn.transform((Node*)new (C, 2) TanDNode(arg)); | |
1092 break; | |
1093 default: | |
1094 assert(false, "bad intrinsic was passed in"); | |
1095 return false; | |
1096 } | |
1097 | |
1098 // Rounding required? Check for argument reduction! | |
1099 if( Matcher::strict_fp_requires_explicit_rounding ) { | |
1100 | |
1101 static const double pi_4 = 0.7853981633974483; | |
1102 static const double neg_pi_4 = -0.7853981633974483; | |
1103 // pi/2 in 80-bit extended precision | |
1104 // static const unsigned char pi_2_bits_x[] = {0x35,0xc2,0x68,0x21,0xa2,0xda,0x0f,0xc9,0xff,0x3f,0x00,0x00,0x00,0x00,0x00,0x00}; | |
1105 // -pi/2 in 80-bit extended precision | |
1106 // static const unsigned char neg_pi_2_bits_x[] = {0x35,0xc2,0x68,0x21,0xa2,0xda,0x0f,0xc9,0xff,0xbf,0x00,0x00,0x00,0x00,0x00,0x00}; | |
1107 // Cutoff value for using this argument reduction technique | |
1108 //static const double pi_2_minus_epsilon = 1.564660403643354; | |
1109 //static const double neg_pi_2_plus_epsilon = -1.564660403643354; | |
1110 | |
1111 // Pseudocode for sin: | |
1112 // if (x <= Math.PI / 4.0) { | |
1113 // if (x >= -Math.PI / 4.0) return fsin(x); | |
1114 // if (x >= -Math.PI / 2.0) return -fcos(x + Math.PI / 2.0); | |
1115 // } else { | |
1116 // if (x <= Math.PI / 2.0) return fcos(x - Math.PI / 2.0); | |
1117 // } | |
1118 // return StrictMath.sin(x); | |
1119 | |
1120 // Pseudocode for cos: | |
1121 // if (x <= Math.PI / 4.0) { | |
1122 // if (x >= -Math.PI / 4.0) return fcos(x); | |
1123 // if (x >= -Math.PI / 2.0) return fsin(x + Math.PI / 2.0); | |
1124 // } else { | |
1125 // if (x <= Math.PI / 2.0) return -fsin(x - Math.PI / 2.0); | |
1126 // } | |
1127 // return StrictMath.cos(x); | |
1128 | |
1129 // Actually, sticking in an 80-bit Intel value into C2 will be tough; it | |
1130 // requires a special machine instruction to load it. Instead we'll try | |
1131 // the 'easy' case. If we really need the extra range +/- PI/2 we'll | |
1132 // probably do the math inside the SIN encoding. | |
1133 | |
1134 // Make the merge point | |
1135 RegionNode *r = new (C, 3) RegionNode(3); | |
1136 Node *phi = new (C, 3) PhiNode(r,Type::DOUBLE); | |
1137 | |
1138 // Flatten arg so we need only 1 test | |
1139 Node *abs = _gvn.transform(new (C, 2) AbsDNode(arg)); | |
1140 // Node for PI/4 constant | |
1141 Node *pi4 = makecon(TypeD::make(pi_4)); | |
1142 // Check PI/4 : abs(arg) | |
1143 Node *cmp = _gvn.transform(new (C, 3) CmpDNode(pi4,abs)); | |
1144 // Check: If PI/4 < abs(arg) then go slow | |
1145 Node *bol = _gvn.transform( new (C, 2) BoolNode( cmp, BoolTest::lt ) ); | |
1146 // Branch either way | |
1147 IfNode *iff = create_and_xform_if(control(),bol, PROB_STATIC_FREQUENT, COUNT_UNKNOWN); | |
1148 set_control(opt_iff(r,iff)); | |
1149 | |
1150 // Set fast path result | |
1151 phi->init_req(2,trig); | |
1152 | |
1153 // Slow path - non-blocking leaf call | |
1154 Node* call = NULL; | |
1155 switch (id) { | |
1156 case vmIntrinsics::_dsin: | |
1157 call = make_runtime_call(RC_LEAF, OptoRuntime::Math_D_D_Type(), | |
1158 CAST_FROM_FN_PTR(address, SharedRuntime::dsin), | |
1159 "Sin", NULL, arg, top()); | |
1160 break; | |
1161 case vmIntrinsics::_dcos: | |
1162 call = make_runtime_call(RC_LEAF, OptoRuntime::Math_D_D_Type(), | |
1163 CAST_FROM_FN_PTR(address, SharedRuntime::dcos), | |
1164 "Cos", NULL, arg, top()); | |
1165 break; | |
1166 case vmIntrinsics::_dtan: | |
1167 call = make_runtime_call(RC_LEAF, OptoRuntime::Math_D_D_Type(), | |
1168 CAST_FROM_FN_PTR(address, SharedRuntime::dtan), | |
1169 "Tan", NULL, arg, top()); | |
1170 break; | |
1171 } | |
1172 assert(control()->in(0) == call, ""); | |
1173 Node* slow_result = _gvn.transform(new (C, 1) ProjNode(call,TypeFunc::Parms)); | |
1174 r->init_req(1,control()); | |
1175 phi->init_req(1,slow_result); | |
1176 | |
1177 // Post-merge | |
1178 set_control(_gvn.transform(r)); | |
1179 record_for_igvn(r); | |
1180 trig = _gvn.transform(phi); | |
1181 | |
1182 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
1183 } | |
1184 // Push result back on JVM stack | |
1185 push_pair(trig); | |
1186 return true; | |
1187 } | |
1188 | |
1189 //------------------------------inline_sqrt------------------------------------- | |
1190 // Inline square root instruction, if possible. | |
1191 bool LibraryCallKit::inline_sqrt(vmIntrinsics::ID id) { | |
1192 assert(id == vmIntrinsics::_dsqrt, "Not square root"); | |
1193 _sp += arg_size(); // restore stack pointer | |
1194 push_pair(_gvn.transform(new (C, 2) SqrtDNode(0, pop_math_arg()))); | |
1195 return true; | |
1196 } | |
1197 | |
1198 //------------------------------inline_abs------------------------------------- | |
1199 // Inline absolute value instruction, if possible. | |
1200 bool LibraryCallKit::inline_abs(vmIntrinsics::ID id) { | |
1201 assert(id == vmIntrinsics::_dabs, "Not absolute value"); | |
1202 _sp += arg_size(); // restore stack pointer | |
1203 push_pair(_gvn.transform(new (C, 2) AbsDNode(pop_math_arg()))); | |
1204 return true; | |
1205 } | |
1206 | |
1207 //------------------------------inline_exp------------------------------------- | |
1208 // Inline exp instructions, if possible. The Intel hardware only misses | |
1209 // really odd corner cases (+/- Infinity). Just uncommon-trap them. | |
1210 bool LibraryCallKit::inline_exp(vmIntrinsics::ID id) { | |
1211 assert(id == vmIntrinsics::_dexp, "Not exp"); | |
1212 | |
1213 // If this inlining ever returned NaN in the past, we do not intrinsify it | |
1214 // every again. NaN results requires StrictMath.exp handling. | |
1215 if (too_many_traps(Deoptimization::Reason_intrinsic)) return false; | |
1216 | |
1217 // Do not intrinsify on older platforms which lack cmove. | |
1218 if (ConditionalMoveLimit == 0) return false; | |
1219 | |
1220 _sp += arg_size(); // restore stack pointer | |
1221 Node *x = pop_math_arg(); | |
1222 Node *result = _gvn.transform(new (C, 2) ExpDNode(0,x)); | |
1223 | |
1224 //------------------- | |
1225 //result=(result.isNaN())? StrictMath::exp():result; | |
1226 // Check: If isNaN() by checking result!=result? then go to Strict Math | |
1227 Node* cmpisnan = _gvn.transform(new (C, 3) CmpDNode(result,result)); | |
1228 // Build the boolean node | |
1229 Node* bolisnum = _gvn.transform( new (C, 2) BoolNode(cmpisnan, BoolTest::eq) ); | |
1230 | |
1231 { BuildCutout unless(this, bolisnum, PROB_STATIC_FREQUENT); | |
1232 // End the current control-flow path | |
1233 push_pair(x); | |
1234 // Math.exp intrinsic returned a NaN, which requires StrictMath.exp | |
1235 // to handle. Recompile without intrinsifying Math.exp | |
1236 uncommon_trap(Deoptimization::Reason_intrinsic, | |
1237 Deoptimization::Action_make_not_entrant); | |
1238 } | |
1239 | |
1240 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
1241 | |
1242 push_pair(result); | |
1243 | |
1244 return true; | |
1245 } | |
1246 | |
1247 //------------------------------inline_pow------------------------------------- | |
1248 // Inline power instructions, if possible. | |
1249 bool LibraryCallKit::inline_pow(vmIntrinsics::ID id) { | |
1250 assert(id == vmIntrinsics::_dpow, "Not pow"); | |
1251 | |
1252 // If this inlining ever returned NaN in the past, we do not intrinsify it | |
1253 // every again. NaN results requires StrictMath.pow handling. | |
1254 if (too_many_traps(Deoptimization::Reason_intrinsic)) return false; | |
1255 | |
1256 // Do not intrinsify on older platforms which lack cmove. | |
1257 if (ConditionalMoveLimit == 0) return false; | |
1258 | |
1259 // Pseudocode for pow | |
1260 // if (x <= 0.0) { | |
1261 // if ((double)((int)y)==y) { // if y is int | |
1262 // result = ((1&(int)y)==0)?-DPow(abs(x), y):DPow(abs(x), y) | |
1263 // } else { | |
1264 // result = NaN; | |
1265 // } | |
1266 // } else { | |
1267 // result = DPow(x,y); | |
1268 // } | |
1269 // if (result != result)? { | |
1270 // ucommon_trap(); | |
1271 // } | |
1272 // return result; | |
1273 | |
1274 _sp += arg_size(); // restore stack pointer | |
1275 Node* y = pop_math_arg(); | |
1276 Node* x = pop_math_arg(); | |
1277 | |
1278 Node *fast_result = _gvn.transform( new (C, 3) PowDNode(0, x, y) ); | |
1279 | |
1280 // Short form: if not top-level (i.e., Math.pow but inlining Math.pow | |
1281 // inside of something) then skip the fancy tests and just check for | |
1282 // NaN result. | |
1283 Node *result = NULL; | |
1284 if( jvms()->depth() >= 1 ) { | |
1285 result = fast_result; | |
1286 } else { | |
1287 | |
1288 // Set the merge point for If node with condition of (x <= 0.0) | |
1289 // There are four possible paths to region node and phi node | |
1290 RegionNode *r = new (C, 4) RegionNode(4); | |
1291 Node *phi = new (C, 4) PhiNode(r, Type::DOUBLE); | |
1292 | |
1293 // Build the first if node: if (x <= 0.0) | |
1294 // Node for 0 constant | |
1295 Node *zeronode = makecon(TypeD::ZERO); | |
1296 // Check x:0 | |
1297 Node *cmp = _gvn.transform(new (C, 3) CmpDNode(x, zeronode)); | |
1298 // Check: If (x<=0) then go complex path | |
1299 Node *bol1 = _gvn.transform( new (C, 2) BoolNode( cmp, BoolTest::le ) ); | |
1300 // Branch either way | |
1301 IfNode *if1 = create_and_xform_if(control(),bol1, PROB_STATIC_INFREQUENT, COUNT_UNKNOWN); | |
1302 Node *opt_test = _gvn.transform(if1); | |
1303 //assert( opt_test->is_If(), "Expect an IfNode"); | |
1304 IfNode *opt_if1 = (IfNode*)opt_test; | |
1305 // Fast path taken; set region slot 3 | |
1306 Node *fast_taken = _gvn.transform( new (C, 1) IfFalseNode(opt_if1) ); | |
1307 r->init_req(3,fast_taken); // Capture fast-control | |
1308 | |
1309 // Fast path not-taken, i.e. slow path | |
1310 Node *complex_path = _gvn.transform( new (C, 1) IfTrueNode(opt_if1) ); | |
1311 | |
1312 // Set fast path result | |
1313 Node *fast_result = _gvn.transform( new (C, 3) PowDNode(0, y, x) ); | |
1314 phi->init_req(3, fast_result); | |
1315 | |
1316 // Complex path | |
1317 // Build the second if node (if y is int) | |
1318 // Node for (int)y | |
1319 Node *inty = _gvn.transform( new (C, 2) ConvD2INode(y)); | |
1320 // Node for (double)((int) y) | |
1321 Node *doubleinty= _gvn.transform( new (C, 2) ConvI2DNode(inty)); | |
1322 // Check (double)((int) y) : y | |
1323 Node *cmpinty= _gvn.transform(new (C, 3) CmpDNode(doubleinty, y)); | |
1324 // Check if (y isn't int) then go to slow path | |
1325 | |
1326 Node *bol2 = _gvn.transform( new (C, 2) BoolNode( cmpinty, BoolTest::ne ) ); | |
1327 // Branch eith way | |
1328 IfNode *if2 = create_and_xform_if(complex_path,bol2, PROB_STATIC_INFREQUENT, COUNT_UNKNOWN); | |
1329 Node *slow_path = opt_iff(r,if2); // Set region path 2 | |
1330 | |
1331 // Calculate DPow(abs(x), y)*(1 & (int)y) | |
1332 // Node for constant 1 | |
1333 Node *conone = intcon(1); | |
1334 // 1& (int)y | |
1335 Node *signnode= _gvn.transform( new (C, 3) AndINode(conone, inty) ); | |
1336 // zero node | |
1337 Node *conzero = intcon(0); | |
1338 // Check (1&(int)y)==0? | |
1339 Node *cmpeq1 = _gvn.transform(new (C, 3) CmpINode(signnode, conzero)); | |
1340 // Check if (1&(int)y)!=0?, if so the result is negative | |
1341 Node *bol3 = _gvn.transform( new (C, 2) BoolNode( cmpeq1, BoolTest::ne ) ); | |
1342 // abs(x) | |
1343 Node *absx=_gvn.transform( new (C, 2) AbsDNode(x)); | |
1344 // abs(x)^y | |
1345 Node *absxpowy = _gvn.transform( new (C, 3) PowDNode(0, y, absx) ); | |
1346 // -abs(x)^y | |
1347 Node *negabsxpowy = _gvn.transform(new (C, 2) NegDNode (absxpowy)); | |
1348 // (1&(int)y)==1?-DPow(abs(x), y):DPow(abs(x), y) | |
1349 Node *signresult = _gvn.transform( CMoveNode::make(C, NULL, bol3, absxpowy, negabsxpowy, Type::DOUBLE)); | |
1350 // Set complex path fast result | |
1351 phi->init_req(2, signresult); | |
1352 | |
1353 static const jlong nan_bits = CONST64(0x7ff8000000000000); | |
1354 Node *slow_result = makecon(TypeD::make(*(double*)&nan_bits)); // return NaN | |
1355 r->init_req(1,slow_path); | |
1356 phi->init_req(1,slow_result); | |
1357 | |
1358 // Post merge | |
1359 set_control(_gvn.transform(r)); | |
1360 record_for_igvn(r); | |
1361 result=_gvn.transform(phi); | |
1362 } | |
1363 | |
1364 //------------------- | |
1365 //result=(result.isNaN())? uncommon_trap():result; | |
1366 // Check: If isNaN() by checking result!=result? then go to Strict Math | |
1367 Node* cmpisnan = _gvn.transform(new (C, 3) CmpDNode(result,result)); | |
1368 // Build the boolean node | |
1369 Node* bolisnum = _gvn.transform( new (C, 2) BoolNode(cmpisnan, BoolTest::eq) ); | |
1370 | |
1371 { BuildCutout unless(this, bolisnum, PROB_STATIC_FREQUENT); | |
1372 // End the current control-flow path | |
1373 push_pair(x); | |
1374 push_pair(y); | |
1375 // Math.pow intrinsic returned a NaN, which requires StrictMath.pow | |
1376 // to handle. Recompile without intrinsifying Math.pow. | |
1377 uncommon_trap(Deoptimization::Reason_intrinsic, | |
1378 Deoptimization::Action_make_not_entrant); | |
1379 } | |
1380 | |
1381 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
1382 | |
1383 push_pair(result); | |
1384 | |
1385 return true; | |
1386 } | |
1387 | |
1388 //------------------------------inline_trans------------------------------------- | |
1389 // Inline transcendental instructions, if possible. The Intel hardware gets | |
1390 // these right, no funny corner cases missed. | |
1391 bool LibraryCallKit::inline_trans(vmIntrinsics::ID id) { | |
1392 _sp += arg_size(); // restore stack pointer | |
1393 Node* arg = pop_math_arg(); | |
1394 Node* trans = NULL; | |
1395 | |
1396 switch (id) { | |
1397 case vmIntrinsics::_dlog: | |
1398 trans = _gvn.transform((Node*)new (C, 2) LogDNode(arg)); | |
1399 break; | |
1400 case vmIntrinsics::_dlog10: | |
1401 trans = _gvn.transform((Node*)new (C, 2) Log10DNode(arg)); | |
1402 break; | |
1403 default: | |
1404 assert(false, "bad intrinsic was passed in"); | |
1405 return false; | |
1406 } | |
1407 | |
1408 // Push result back on JVM stack | |
1409 push_pair(trans); | |
1410 return true; | |
1411 } | |
1412 | |
1413 //------------------------------runtime_math----------------------------- | |
1414 bool LibraryCallKit::runtime_math(const TypeFunc* call_type, address funcAddr, const char* funcName) { | |
1415 Node* a = NULL; | |
1416 Node* b = NULL; | |
1417 | |
1418 assert(call_type == OptoRuntime::Math_DD_D_Type() || call_type == OptoRuntime::Math_D_D_Type(), | |
1419 "must be (DD)D or (D)D type"); | |
1420 | |
1421 // Inputs | |
1422 _sp += arg_size(); // restore stack pointer | |
1423 if (call_type == OptoRuntime::Math_DD_D_Type()) { | |
1424 b = pop_math_arg(); | |
1425 } | |
1426 a = pop_math_arg(); | |
1427 | |
1428 const TypePtr* no_memory_effects = NULL; | |
1429 Node* trig = make_runtime_call(RC_LEAF, call_type, funcAddr, funcName, | |
1430 no_memory_effects, | |
1431 a, top(), b, b ? top() : NULL); | |
1432 Node* value = _gvn.transform(new (C, 1) ProjNode(trig, TypeFunc::Parms+0)); | |
1433 #ifdef ASSERT | |
1434 Node* value_top = _gvn.transform(new (C, 1) ProjNode(trig, TypeFunc::Parms+1)); | |
1435 assert(value_top == top(), "second value must be top"); | |
1436 #endif | |
1437 | |
1438 push_pair(value); | |
1439 return true; | |
1440 } | |
1441 | |
1442 //------------------------------inline_math_native----------------------------- | |
1443 bool LibraryCallKit::inline_math_native(vmIntrinsics::ID id) { | |
1444 switch (id) { | |
1445 // These intrinsics are not properly supported on all hardware | |
1446 case vmIntrinsics::_dcos: return Matcher::has_match_rule(Op_CosD) ? inline_trig(id) : | |
1447 runtime_math(OptoRuntime::Math_D_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dcos), "COS"); | |
1448 case vmIntrinsics::_dsin: return Matcher::has_match_rule(Op_SinD) ? inline_trig(id) : | |
1449 runtime_math(OptoRuntime::Math_D_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dsin), "SIN"); | |
1450 case vmIntrinsics::_dtan: return Matcher::has_match_rule(Op_TanD) ? inline_trig(id) : | |
1451 runtime_math(OptoRuntime::Math_D_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dtan), "TAN"); | |
1452 | |
1453 case vmIntrinsics::_dlog: return Matcher::has_match_rule(Op_LogD) ? inline_trans(id) : | |
1454 runtime_math(OptoRuntime::Math_D_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dlog), "LOG"); | |
1455 case vmIntrinsics::_dlog10: return Matcher::has_match_rule(Op_Log10D) ? inline_trans(id) : | |
1456 runtime_math(OptoRuntime::Math_D_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dlog10), "LOG10"); | |
1457 | |
1458 // These intrinsics are supported on all hardware | |
1459 case vmIntrinsics::_dsqrt: return Matcher::has_match_rule(Op_SqrtD) ? inline_sqrt(id) : false; | |
1460 case vmIntrinsics::_dabs: return Matcher::has_match_rule(Op_AbsD) ? inline_abs(id) : false; | |
1461 | |
1462 // These intrinsics don't work on X86. The ad implementation doesn't | |
1463 // handle NaN's properly. Instead of returning infinity, the ad | |
1464 // implementation returns a NaN on overflow. See bug: 6304089 | |
1465 // Once the ad implementations are fixed, change the code below | |
1466 // to match the intrinsics above | |
1467 | |
1468 case vmIntrinsics::_dexp: return | |
1469 runtime_math(OptoRuntime::Math_D_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dexp), "EXP"); | |
1470 case vmIntrinsics::_dpow: return | |
1471 runtime_math(OptoRuntime::Math_DD_D_Type(), CAST_FROM_FN_PTR(address, SharedRuntime::dpow), "POW"); | |
1472 | |
1473 // These intrinsics are not yet correctly implemented | |
1474 case vmIntrinsics::_datan2: | |
1475 return false; | |
1476 | |
1477 default: | |
1478 ShouldNotReachHere(); | |
1479 return false; | |
1480 } | |
1481 } | |
1482 | |
1483 static bool is_simple_name(Node* n) { | |
1484 return (n->req() == 1 // constant | |
1485 || (n->is_Type() && n->as_Type()->type()->singleton()) | |
1486 || n->is_Proj() // parameter or return value | |
1487 || n->is_Phi() // local of some sort | |
1488 ); | |
1489 } | |
1490 | |
1491 //----------------------------inline_min_max----------------------------------- | |
1492 bool LibraryCallKit::inline_min_max(vmIntrinsics::ID id) { | |
1493 push(generate_min_max(id, argument(0), argument(1))); | |
1494 | |
1495 return true; | |
1496 } | |
1497 | |
1498 Node* | |
1499 LibraryCallKit::generate_min_max(vmIntrinsics::ID id, Node* x0, Node* y0) { | |
1500 // These are the candidate return value: | |
1501 Node* xvalue = x0; | |
1502 Node* yvalue = y0; | |
1503 | |
1504 if (xvalue == yvalue) { | |
1505 return xvalue; | |
1506 } | |
1507 | |
1508 bool want_max = (id == vmIntrinsics::_max); | |
1509 | |
1510 const TypeInt* txvalue = _gvn.type(xvalue)->isa_int(); | |
1511 const TypeInt* tyvalue = _gvn.type(yvalue)->isa_int(); | |
1512 if (txvalue == NULL || tyvalue == NULL) return top(); | |
1513 // This is not really necessary, but it is consistent with a | |
1514 // hypothetical MaxINode::Value method: | |
1515 int widen = MAX2(txvalue->_widen, tyvalue->_widen); | |
1516 | |
1517 // %%% This folding logic should (ideally) be in a different place. | |
1518 // Some should be inside IfNode, and there to be a more reliable | |
1519 // transformation of ?: style patterns into cmoves. We also want | |
1520 // more powerful optimizations around cmove and min/max. | |
1521 | |
1522 // Try to find a dominating comparison of these guys. | |
1523 // It can simplify the index computation for Arrays.copyOf | |
1524 // and similar uses of System.arraycopy. | |
1525 // First, compute the normalized version of CmpI(x, y). | |
1526 int cmp_op = Op_CmpI; | |
1527 Node* xkey = xvalue; | |
1528 Node* ykey = yvalue; | |
1529 Node* ideal_cmpxy = _gvn.transform( new(C, 3) CmpINode(xkey, ykey) ); | |
1530 if (ideal_cmpxy->is_Cmp()) { | |
1531 // E.g., if we have CmpI(length - offset, count), | |
1532 // it might idealize to CmpI(length, count + offset) | |
1533 cmp_op = ideal_cmpxy->Opcode(); | |
1534 xkey = ideal_cmpxy->in(1); | |
1535 ykey = ideal_cmpxy->in(2); | |
1536 } | |
1537 | |
1538 // Start by locating any relevant comparisons. | |
1539 Node* start_from = (xkey->outcnt() < ykey->outcnt()) ? xkey : ykey; | |
1540 Node* cmpxy = NULL; | |
1541 Node* cmpyx = NULL; | |
1542 for (DUIterator_Fast kmax, k = start_from->fast_outs(kmax); k < kmax; k++) { | |
1543 Node* cmp = start_from->fast_out(k); | |
1544 if (cmp->outcnt() > 0 && // must have prior uses | |
1545 cmp->in(0) == NULL && // must be context-independent | |
1546 cmp->Opcode() == cmp_op) { // right kind of compare | |
1547 if (cmp->in(1) == xkey && cmp->in(2) == ykey) cmpxy = cmp; | |
1548 if (cmp->in(1) == ykey && cmp->in(2) == xkey) cmpyx = cmp; | |
1549 } | |
1550 } | |
1551 | |
1552 const int NCMPS = 2; | |
1553 Node* cmps[NCMPS] = { cmpxy, cmpyx }; | |
1554 int cmpn; | |
1555 for (cmpn = 0; cmpn < NCMPS; cmpn++) { | |
1556 if (cmps[cmpn] != NULL) break; // find a result | |
1557 } | |
1558 if (cmpn < NCMPS) { | |
1559 // Look for a dominating test that tells us the min and max. | |
1560 int depth = 0; // Limit search depth for speed | |
1561 Node* dom = control(); | |
1562 for (; dom != NULL; dom = IfNode::up_one_dom(dom, true)) { | |
1563 if (++depth >= 100) break; | |
1564 Node* ifproj = dom; | |
1565 if (!ifproj->is_Proj()) continue; | |
1566 Node* iff = ifproj->in(0); | |
1567 if (!iff->is_If()) continue; | |
1568 Node* bol = iff->in(1); | |
1569 if (!bol->is_Bool()) continue; | |
1570 Node* cmp = bol->in(1); | |
1571 if (cmp == NULL) continue; | |
1572 for (cmpn = 0; cmpn < NCMPS; cmpn++) | |
1573 if (cmps[cmpn] == cmp) break; | |
1574 if (cmpn == NCMPS) continue; | |
1575 BoolTest::mask btest = bol->as_Bool()->_test._test; | |
1576 if (ifproj->is_IfFalse()) btest = BoolTest(btest).negate(); | |
1577 if (cmp->in(1) == ykey) btest = BoolTest(btest).commute(); | |
1578 // At this point, we know that 'x btest y' is true. | |
1579 switch (btest) { | |
1580 case BoolTest::eq: | |
1581 // They are proven equal, so we can collapse the min/max. | |
1582 // Either value is the answer. Choose the simpler. | |
1583 if (is_simple_name(yvalue) && !is_simple_name(xvalue)) | |
1584 return yvalue; | |
1585 return xvalue; | |
1586 case BoolTest::lt: // x < y | |
1587 case BoolTest::le: // x <= y | |
1588 return (want_max ? yvalue : xvalue); | |
1589 case BoolTest::gt: // x > y | |
1590 case BoolTest::ge: // x >= y | |
1591 return (want_max ? xvalue : yvalue); | |
1592 } | |
1593 } | |
1594 } | |
1595 | |
1596 // We failed to find a dominating test. | |
1597 // Let's pick a test that might GVN with prior tests. | |
1598 Node* best_bol = NULL; | |
1599 BoolTest::mask best_btest = BoolTest::illegal; | |
1600 for (cmpn = 0; cmpn < NCMPS; cmpn++) { | |
1601 Node* cmp = cmps[cmpn]; | |
1602 if (cmp == NULL) continue; | |
1603 for (DUIterator_Fast jmax, j = cmp->fast_outs(jmax); j < jmax; j++) { | |
1604 Node* bol = cmp->fast_out(j); | |
1605 if (!bol->is_Bool()) continue; | |
1606 BoolTest::mask btest = bol->as_Bool()->_test._test; | |
1607 if (btest == BoolTest::eq || btest == BoolTest::ne) continue; | |
1608 if (cmp->in(1) == ykey) btest = BoolTest(btest).commute(); | |
1609 if (bol->outcnt() > (best_bol == NULL ? 0 : best_bol->outcnt())) { | |
1610 best_bol = bol->as_Bool(); | |
1611 best_btest = btest; | |
1612 } | |
1613 } | |
1614 } | |
1615 | |
1616 Node* answer_if_true = NULL; | |
1617 Node* answer_if_false = NULL; | |
1618 switch (best_btest) { | |
1619 default: | |
1620 if (cmpxy == NULL) | |
1621 cmpxy = ideal_cmpxy; | |
1622 best_bol = _gvn.transform( new(C, 2) BoolNode(cmpxy, BoolTest::lt) ); | |
1623 // and fall through: | |
1624 case BoolTest::lt: // x < y | |
1625 case BoolTest::le: // x <= y | |
1626 answer_if_true = (want_max ? yvalue : xvalue); | |
1627 answer_if_false = (want_max ? xvalue : yvalue); | |
1628 break; | |
1629 case BoolTest::gt: // x > y | |
1630 case BoolTest::ge: // x >= y | |
1631 answer_if_true = (want_max ? xvalue : yvalue); | |
1632 answer_if_false = (want_max ? yvalue : xvalue); | |
1633 break; | |
1634 } | |
1635 | |
1636 jint hi, lo; | |
1637 if (want_max) { | |
1638 // We can sharpen the minimum. | |
1639 hi = MAX2(txvalue->_hi, tyvalue->_hi); | |
1640 lo = MAX2(txvalue->_lo, tyvalue->_lo); | |
1641 } else { | |
1642 // We can sharpen the maximum. | |
1643 hi = MIN2(txvalue->_hi, tyvalue->_hi); | |
1644 lo = MIN2(txvalue->_lo, tyvalue->_lo); | |
1645 } | |
1646 | |
1647 // Use a flow-free graph structure, to avoid creating excess control edges | |
1648 // which could hinder other optimizations. | |
1649 // Since Math.min/max is often used with arraycopy, we want | |
1650 // tightly_coupled_allocation to be able to see beyond min/max expressions. | |
1651 Node* cmov = CMoveNode::make(C, NULL, best_bol, | |
1652 answer_if_false, answer_if_true, | |
1653 TypeInt::make(lo, hi, widen)); | |
1654 | |
1655 return _gvn.transform(cmov); | |
1656 | |
1657 /* | |
1658 // This is not as desirable as it may seem, since Min and Max | |
1659 // nodes do not have a full set of optimizations. | |
1660 // And they would interfere, anyway, with 'if' optimizations | |
1661 // and with CMoveI canonical forms. | |
1662 switch (id) { | |
1663 case vmIntrinsics::_min: | |
1664 result_val = _gvn.transform(new (C, 3) MinINode(x,y)); break; | |
1665 case vmIntrinsics::_max: | |
1666 result_val = _gvn.transform(new (C, 3) MaxINode(x,y)); break; | |
1667 default: | |
1668 ShouldNotReachHere(); | |
1669 } | |
1670 */ | |
1671 } | |
1672 | |
1673 inline int | |
1674 LibraryCallKit::classify_unsafe_addr(Node* &base, Node* &offset) { | |
1675 const TypePtr* base_type = TypePtr::NULL_PTR; | |
1676 if (base != NULL) base_type = _gvn.type(base)->isa_ptr(); | |
1677 if (base_type == NULL) { | |
1678 // Unknown type. | |
1679 return Type::AnyPtr; | |
1680 } else if (base_type == TypePtr::NULL_PTR) { | |
1681 // Since this is a NULL+long form, we have to switch to a rawptr. | |
1682 base = _gvn.transform( new (C, 2) CastX2PNode(offset) ); | |
1683 offset = MakeConX(0); | |
1684 return Type::RawPtr; | |
1685 } else if (base_type->base() == Type::RawPtr) { | |
1686 return Type::RawPtr; | |
1687 } else if (base_type->isa_oopptr()) { | |
1688 // Base is never null => always a heap address. | |
1689 if (base_type->ptr() == TypePtr::NotNull) { | |
1690 return Type::OopPtr; | |
1691 } | |
1692 // Offset is small => always a heap address. | |
1693 const TypeX* offset_type = _gvn.type(offset)->isa_intptr_t(); | |
1694 if (offset_type != NULL && | |
1695 base_type->offset() == 0 && // (should always be?) | |
1696 offset_type->_lo >= 0 && | |
1697 !MacroAssembler::needs_explicit_null_check(offset_type->_hi)) { | |
1698 return Type::OopPtr; | |
1699 } | |
1700 // Otherwise, it might either be oop+off or NULL+addr. | |
1701 return Type::AnyPtr; | |
1702 } else { | |
1703 // No information: | |
1704 return Type::AnyPtr; | |
1705 } | |
1706 } | |
1707 | |
1708 inline Node* LibraryCallKit::make_unsafe_address(Node* base, Node* offset) { | |
1709 int kind = classify_unsafe_addr(base, offset); | |
1710 if (kind == Type::RawPtr) { | |
1711 return basic_plus_adr(top(), base, offset); | |
1712 } else { | |
1713 return basic_plus_adr(base, offset); | |
1714 } | |
1715 } | |
1716 | |
1717 //----------------------------inline_reverseBytes_int/long------------------- | |
1718 // inline Int.reverseBytes(int) | |
1719 // inline Long.reverseByes(long) | |
1720 bool LibraryCallKit::inline_reverseBytes(vmIntrinsics::ID id) { | |
1721 assert(id == vmIntrinsics::_reverseBytes_i || id == vmIntrinsics::_reverseBytes_l, "not reverse Bytes"); | |
1722 if (id == vmIntrinsics::_reverseBytes_i && !Matcher::has_match_rule(Op_ReverseBytesI)) return false; | |
1723 if (id == vmIntrinsics::_reverseBytes_l && !Matcher::has_match_rule(Op_ReverseBytesL)) return false; | |
1724 _sp += arg_size(); // restore stack pointer | |
1725 switch (id) { | |
1726 case vmIntrinsics::_reverseBytes_i: | |
1727 push(_gvn.transform(new (C, 2) ReverseBytesINode(0, pop()))); | |
1728 break; | |
1729 case vmIntrinsics::_reverseBytes_l: | |
1730 push_pair(_gvn.transform(new (C, 2) ReverseBytesLNode(0, pop_pair()))); | |
1731 break; | |
1732 default: | |
1733 ; | |
1734 } | |
1735 return true; | |
1736 } | |
1737 | |
1738 //----------------------------inline_unsafe_access---------------------------- | |
1739 | |
1740 const static BasicType T_ADDRESS_HOLDER = T_LONG; | |
1741 | |
1742 // Interpret Unsafe.fieldOffset cookies correctly: | |
1743 extern jlong Unsafe_field_offset_to_byte_offset(jlong field_offset); | |
1744 | |
1745 bool LibraryCallKit::inline_unsafe_access(bool is_native_ptr, bool is_store, BasicType type, bool is_volatile) { | |
1746 if (callee()->is_static()) return false; // caller must have the capability! | |
1747 | |
1748 #ifndef PRODUCT | |
1749 { | |
1750 ResourceMark rm; | |
1751 // Check the signatures. | |
1752 ciSignature* sig = signature(); | |
1753 #ifdef ASSERT | |
1754 if (!is_store) { | |
1755 // Object getObject(Object base, int/long offset), etc. | |
1756 BasicType rtype = sig->return_type()->basic_type(); | |
1757 if (rtype == T_ADDRESS_HOLDER && callee()->name() == ciSymbol::getAddress_name()) | |
1758 rtype = T_ADDRESS; // it is really a C void* | |
1759 assert(rtype == type, "getter must return the expected value"); | |
1760 if (!is_native_ptr) { | |
1761 assert(sig->count() == 2, "oop getter has 2 arguments"); | |
1762 assert(sig->type_at(0)->basic_type() == T_OBJECT, "getter base is object"); | |
1763 assert(sig->type_at(1)->basic_type() == T_LONG, "getter offset is correct"); | |
1764 } else { | |
1765 assert(sig->count() == 1, "native getter has 1 argument"); | |
1766 assert(sig->type_at(0)->basic_type() == T_LONG, "getter base is long"); | |
1767 } | |
1768 } else { | |
1769 // void putObject(Object base, int/long offset, Object x), etc. | |
1770 assert(sig->return_type()->basic_type() == T_VOID, "putter must not return a value"); | |
1771 if (!is_native_ptr) { | |
1772 assert(sig->count() == 3, "oop putter has 3 arguments"); | |
1773 assert(sig->type_at(0)->basic_type() == T_OBJECT, "putter base is object"); | |
1774 assert(sig->type_at(1)->basic_type() == T_LONG, "putter offset is correct"); | |
1775 } else { | |
1776 assert(sig->count() == 2, "native putter has 2 arguments"); | |
1777 assert(sig->type_at(0)->basic_type() == T_LONG, "putter base is long"); | |
1778 } | |
1779 BasicType vtype = sig->type_at(sig->count()-1)->basic_type(); | |
1780 if (vtype == T_ADDRESS_HOLDER && callee()->name() == ciSymbol::putAddress_name()) | |
1781 vtype = T_ADDRESS; // it is really a C void* | |
1782 assert(vtype == type, "putter must accept the expected value"); | |
1783 } | |
1784 #endif // ASSERT | |
1785 } | |
1786 #endif //PRODUCT | |
1787 | |
1788 C->set_has_unsafe_access(true); // Mark eventual nmethod as "unsafe". | |
1789 | |
1790 int type_words = type2size[ (type == T_ADDRESS) ? T_LONG : type ]; | |
1791 | |
1792 // Argument words: "this" plus (oop/offset) or (lo/hi) args plus maybe 1 or 2 value words | |
1793 int nargs = 1 + (is_native_ptr ? 2 : 3) + (is_store ? type_words : 0); | |
1794 | |
1795 debug_only(int saved_sp = _sp); | |
1796 _sp += nargs; | |
1797 | |
1798 Node* val; | |
1799 debug_only(val = (Node*)(uintptr_t)-1); | |
1800 | |
1801 | |
1802 if (is_store) { | |
1803 // Get the value being stored. (Pop it first; it was pushed last.) | |
1804 switch (type) { | |
1805 case T_DOUBLE: | |
1806 case T_LONG: | |
1807 case T_ADDRESS: | |
1808 val = pop_pair(); | |
1809 break; | |
1810 default: | |
1811 val = pop(); | |
1812 } | |
1813 } | |
1814 | |
1815 // Build address expression. See the code in inline_unsafe_prefetch. | |
1816 Node *adr; | |
1817 Node *heap_base_oop = top(); | |
1818 if (!is_native_ptr) { | |
1819 // The offset is a value produced by Unsafe.staticFieldOffset or Unsafe.objectFieldOffset | |
1820 Node* offset = pop_pair(); | |
1821 // The base is either a Java object or a value produced by Unsafe.staticFieldBase | |
1822 Node* base = pop(); | |
1823 // We currently rely on the cookies produced by Unsafe.xxxFieldOffset | |
1824 // to be plain byte offsets, which are also the same as those accepted | |
1825 // by oopDesc::field_base. | |
1826 assert(Unsafe_field_offset_to_byte_offset(11) == 11, | |
1827 "fieldOffset must be byte-scaled"); | |
1828 // 32-bit machines ignore the high half! | |
1829 offset = ConvL2X(offset); | |
1830 adr = make_unsafe_address(base, offset); | |
1831 heap_base_oop = base; | |
1832 } else { | |
1833 Node* ptr = pop_pair(); | |
1834 // Adjust Java long to machine word: | |
1835 ptr = ConvL2X(ptr); | |
1836 adr = make_unsafe_address(NULL, ptr); | |
1837 } | |
1838 | |
1839 // Pop receiver last: it was pushed first. | |
1840 Node *receiver = pop(); | |
1841 | |
1842 assert(saved_sp == _sp, "must have correct argument count"); | |
1843 | |
1844 const TypePtr *adr_type = _gvn.type(adr)->isa_ptr(); | |
1845 | |
1846 // First guess at the value type. | |
1847 const Type *value_type = Type::get_const_basic_type(type); | |
1848 | |
1849 // Try to categorize the address. If it comes up as TypeJavaPtr::BOTTOM, | |
1850 // there was not enough information to nail it down. | |
1851 Compile::AliasType* alias_type = C->alias_type(adr_type); | |
1852 assert(alias_type->index() != Compile::AliasIdxBot, "no bare pointers here"); | |
1853 | |
1854 // We will need memory barriers unless we can determine a unique | |
1855 // alias category for this reference. (Note: If for some reason | |
1856 // the barriers get omitted and the unsafe reference begins to "pollute" | |
1857 // the alias analysis of the rest of the graph, either Compile::can_alias | |
1858 // or Compile::must_alias will throw a diagnostic assert.) | |
1859 bool need_mem_bar = (alias_type->adr_type() == TypeOopPtr::BOTTOM); | |
1860 | |
1861 if (!is_store && type == T_OBJECT) { | |
1862 // Attempt to infer a sharper value type from the offset and base type. | |
1863 ciKlass* sharpened_klass = NULL; | |
1864 | |
1865 // See if it is an instance field, with an object type. | |
1866 if (alias_type->field() != NULL) { | |
1867 assert(!is_native_ptr, "native pointer op cannot use a java address"); | |
1868 if (alias_type->field()->type()->is_klass()) { | |
1869 sharpened_klass = alias_type->field()->type()->as_klass(); | |
1870 } | |
1871 } | |
1872 | |
1873 // See if it is a narrow oop array. | |
1874 if (adr_type->isa_aryptr()) { | |
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1875 if (adr_type->offset() >= objArrayOopDesc::base_offset_in_bytes(type)) { |
0 | 1876 const TypeOopPtr *elem_type = adr_type->is_aryptr()->elem()->isa_oopptr(); |
1877 if (elem_type != NULL) { | |
1878 sharpened_klass = elem_type->klass(); | |
1879 } | |
1880 } | |
1881 } | |
1882 | |
1883 if (sharpened_klass != NULL) { | |
1884 const TypeOopPtr* tjp = TypeOopPtr::make_from_klass(sharpened_klass); | |
1885 | |
1886 // Sharpen the value type. | |
1887 value_type = tjp; | |
1888 | |
1889 #ifndef PRODUCT | |
1890 if (PrintIntrinsics || PrintInlining || PrintOptoInlining) { | |
1891 tty->print(" from base type: "); adr_type->dump(); | |
1892 tty->print(" sharpened value: "); value_type->dump(); | |
1893 } | |
1894 #endif | |
1895 } | |
1896 } | |
1897 | |
1898 // Null check on self without removing any arguments. The argument | |
1899 // null check technically happens in the wrong place, which can lead to | |
1900 // invalid stack traces when the primitive is inlined into a method | |
1901 // which handles NullPointerExceptions. | |
1902 _sp += nargs; | |
1903 do_null_check(receiver, T_OBJECT); | |
1904 _sp -= nargs; | |
1905 if (stopped()) { | |
1906 return true; | |
1907 } | |
1908 // Heap pointers get a null-check from the interpreter, | |
1909 // as a courtesy. However, this is not guaranteed by Unsafe, | |
1910 // and it is not possible to fully distinguish unintended nulls | |
1911 // from intended ones in this API. | |
1912 | |
1913 if (is_volatile) { | |
1914 // We need to emit leading and trailing CPU membars (see below) in | |
1915 // addition to memory membars when is_volatile. This is a little | |
1916 // too strong, but avoids the need to insert per-alias-type | |
1917 // volatile membars (for stores; compare Parse::do_put_xxx), which | |
1918 // we cannot do effctively here because we probably only have a | |
1919 // rough approximation of type. | |
1920 need_mem_bar = true; | |
1921 // For Stores, place a memory ordering barrier now. | |
1922 if (is_store) | |
1923 insert_mem_bar(Op_MemBarRelease); | |
1924 } | |
1925 | |
1926 // Memory barrier to prevent normal and 'unsafe' accesses from | |
1927 // bypassing each other. Happens after null checks, so the | |
1928 // exception paths do not take memory state from the memory barrier, | |
1929 // so there's no problems making a strong assert about mixing users | |
1930 // of safe & unsafe memory. Otherwise fails in a CTW of rt.jar | |
1931 // around 5701, class sun/reflect/UnsafeBooleanFieldAccessorImpl. | |
1932 if (need_mem_bar) insert_mem_bar(Op_MemBarCPUOrder); | |
1933 | |
1934 if (!is_store) { | |
1935 Node* p = make_load(control(), adr, value_type, type, adr_type, is_volatile); | |
1936 // load value and push onto stack | |
1937 switch (type) { | |
1938 case T_BOOLEAN: | |
1939 case T_CHAR: | |
1940 case T_BYTE: | |
1941 case T_SHORT: | |
1942 case T_INT: | |
1943 case T_FLOAT: | |
1944 case T_OBJECT: | |
1945 push( p ); | |
1946 break; | |
1947 case T_ADDRESS: | |
1948 // Cast to an int type. | |
1949 p = _gvn.transform( new (C, 2) CastP2XNode(NULL,p) ); | |
1950 p = ConvX2L(p); | |
1951 push_pair(p); | |
1952 break; | |
1953 case T_DOUBLE: | |
1954 case T_LONG: | |
1955 push_pair( p ); | |
1956 break; | |
1957 default: ShouldNotReachHere(); | |
1958 } | |
1959 } else { | |
1960 // place effect of store into memory | |
1961 switch (type) { | |
1962 case T_DOUBLE: | |
1963 val = dstore_rounding(val); | |
1964 break; | |
1965 case T_ADDRESS: | |
1966 // Repackage the long as a pointer. | |
1967 val = ConvL2X(val); | |
1968 val = _gvn.transform( new (C, 2) CastX2PNode(val) ); | |
1969 break; | |
1970 } | |
1971 | |
1972 if (type != T_OBJECT ) { | |
1973 (void) store_to_memory(control(), adr, val, type, adr_type, is_volatile); | |
1974 } else { | |
1975 // Possibly an oop being stored to Java heap or native memory | |
1976 if (!TypePtr::NULL_PTR->higher_equal(_gvn.type(heap_base_oop))) { | |
1977 // oop to Java heap. | |
1978 (void) store_oop_to_unknown(control(), heap_base_oop, adr, adr_type, val, val->bottom_type(), type); | |
1979 } else { | |
1980 | |
1981 // We can't tell at compile time if we are storing in the Java heap or outside | |
1982 // of it. So we need to emit code to conditionally do the proper type of | |
1983 // store. | |
1984 | |
1985 IdealKit kit(gvn(), control(), merged_memory()); | |
1986 kit.declares_done(); | |
1987 // QQQ who knows what probability is here?? | |
1988 kit.if_then(heap_base_oop, BoolTest::ne, null(), PROB_UNLIKELY(0.999)); { | |
1989 (void) store_oop_to_unknown(control(), heap_base_oop, adr, adr_type, val, val->bottom_type(), type); | |
1990 } kit.else_(); { | |
1991 (void) store_to_memory(control(), adr, val, type, adr_type, is_volatile); | |
1992 } kit.end_if(); | |
1993 } | |
1994 } | |
1995 } | |
1996 | |
1997 if (is_volatile) { | |
1998 if (!is_store) | |
1999 insert_mem_bar(Op_MemBarAcquire); | |
2000 else | |
2001 insert_mem_bar(Op_MemBarVolatile); | |
2002 } | |
2003 | |
2004 if (need_mem_bar) insert_mem_bar(Op_MemBarCPUOrder); | |
2005 | |
2006 return true; | |
2007 } | |
2008 | |
2009 //----------------------------inline_unsafe_prefetch---------------------------- | |
2010 | |
2011 bool LibraryCallKit::inline_unsafe_prefetch(bool is_native_ptr, bool is_store, bool is_static) { | |
2012 #ifndef PRODUCT | |
2013 { | |
2014 ResourceMark rm; | |
2015 // Check the signatures. | |
2016 ciSignature* sig = signature(); | |
2017 #ifdef ASSERT | |
2018 // Object getObject(Object base, int/long offset), etc. | |
2019 BasicType rtype = sig->return_type()->basic_type(); | |
2020 if (!is_native_ptr) { | |
2021 assert(sig->count() == 2, "oop prefetch has 2 arguments"); | |
2022 assert(sig->type_at(0)->basic_type() == T_OBJECT, "prefetch base is object"); | |
2023 assert(sig->type_at(1)->basic_type() == T_LONG, "prefetcha offset is correct"); | |
2024 } else { | |
2025 assert(sig->count() == 1, "native prefetch has 1 argument"); | |
2026 assert(sig->type_at(0)->basic_type() == T_LONG, "prefetch base is long"); | |
2027 } | |
2028 #endif // ASSERT | |
2029 } | |
2030 #endif // !PRODUCT | |
2031 | |
2032 C->set_has_unsafe_access(true); // Mark eventual nmethod as "unsafe". | |
2033 | |
2034 // Argument words: "this" if not static, plus (oop/offset) or (lo/hi) args | |
2035 int nargs = (is_static ? 0 : 1) + (is_native_ptr ? 2 : 3); | |
2036 | |
2037 debug_only(int saved_sp = _sp); | |
2038 _sp += nargs; | |
2039 | |
2040 // Build address expression. See the code in inline_unsafe_access. | |
2041 Node *adr; | |
2042 if (!is_native_ptr) { | |
2043 // The offset is a value produced by Unsafe.staticFieldOffset or Unsafe.objectFieldOffset | |
2044 Node* offset = pop_pair(); | |
2045 // The base is either a Java object or a value produced by Unsafe.staticFieldBase | |
2046 Node* base = pop(); | |
2047 // We currently rely on the cookies produced by Unsafe.xxxFieldOffset | |
2048 // to be plain byte offsets, which are also the same as those accepted | |
2049 // by oopDesc::field_base. | |
2050 assert(Unsafe_field_offset_to_byte_offset(11) == 11, | |
2051 "fieldOffset must be byte-scaled"); | |
2052 // 32-bit machines ignore the high half! | |
2053 offset = ConvL2X(offset); | |
2054 adr = make_unsafe_address(base, offset); | |
2055 } else { | |
2056 Node* ptr = pop_pair(); | |
2057 // Adjust Java long to machine word: | |
2058 ptr = ConvL2X(ptr); | |
2059 adr = make_unsafe_address(NULL, ptr); | |
2060 } | |
2061 | |
2062 if (is_static) { | |
2063 assert(saved_sp == _sp, "must have correct argument count"); | |
2064 } else { | |
2065 // Pop receiver last: it was pushed first. | |
2066 Node *receiver = pop(); | |
2067 assert(saved_sp == _sp, "must have correct argument count"); | |
2068 | |
2069 // Null check on self without removing any arguments. The argument | |
2070 // null check technically happens in the wrong place, which can lead to | |
2071 // invalid stack traces when the primitive is inlined into a method | |
2072 // which handles NullPointerExceptions. | |
2073 _sp += nargs; | |
2074 do_null_check(receiver, T_OBJECT); | |
2075 _sp -= nargs; | |
2076 if (stopped()) { | |
2077 return true; | |
2078 } | |
2079 } | |
2080 | |
2081 // Generate the read or write prefetch | |
2082 Node *prefetch; | |
2083 if (is_store) { | |
2084 prefetch = new (C, 3) PrefetchWriteNode(i_o(), adr); | |
2085 } else { | |
2086 prefetch = new (C, 3) PrefetchReadNode(i_o(), adr); | |
2087 } | |
2088 prefetch->init_req(0, control()); | |
2089 set_i_o(_gvn.transform(prefetch)); | |
2090 | |
2091 return true; | |
2092 } | |
2093 | |
2094 //----------------------------inline_unsafe_CAS---------------------------- | |
2095 | |
2096 bool LibraryCallKit::inline_unsafe_CAS(BasicType type) { | |
2097 // This basic scheme here is the same as inline_unsafe_access, but | |
2098 // differs in enough details that combining them would make the code | |
2099 // overly confusing. (This is a true fact! I originally combined | |
2100 // them, but even I was confused by it!) As much code/comments as | |
2101 // possible are retained from inline_unsafe_access though to make | |
2102 // the correspondances clearer. - dl | |
2103 | |
2104 if (callee()->is_static()) return false; // caller must have the capability! | |
2105 | |
2106 #ifndef PRODUCT | |
2107 { | |
2108 ResourceMark rm; | |
2109 // Check the signatures. | |
2110 ciSignature* sig = signature(); | |
2111 #ifdef ASSERT | |
2112 BasicType rtype = sig->return_type()->basic_type(); | |
2113 assert(rtype == T_BOOLEAN, "CAS must return boolean"); | |
2114 assert(sig->count() == 4, "CAS has 4 arguments"); | |
2115 assert(sig->type_at(0)->basic_type() == T_OBJECT, "CAS base is object"); | |
2116 assert(sig->type_at(1)->basic_type() == T_LONG, "CAS offset is long"); | |
2117 #endif // ASSERT | |
2118 } | |
2119 #endif //PRODUCT | |
2120 | |
2121 // number of stack slots per value argument (1 or 2) | |
2122 int type_words = type2size[type]; | |
2123 | |
2124 // Cannot inline wide CAS on machines that don't support it natively | |
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2125 if (type2aelembytes(type) > BytesPerInt && !VM_Version::supports_cx8()) |
0 | 2126 return false; |
2127 | |
2128 C->set_has_unsafe_access(true); // Mark eventual nmethod as "unsafe". | |
2129 | |
2130 // Argument words: "this" plus oop plus offset plus oldvalue plus newvalue; | |
2131 int nargs = 1 + 1 + 2 + type_words + type_words; | |
2132 | |
2133 // pop arguments: newval, oldval, offset, base, and receiver | |
2134 debug_only(int saved_sp = _sp); | |
2135 _sp += nargs; | |
2136 Node* newval = (type_words == 1) ? pop() : pop_pair(); | |
2137 Node* oldval = (type_words == 1) ? pop() : pop_pair(); | |
2138 Node *offset = pop_pair(); | |
2139 Node *base = pop(); | |
2140 Node *receiver = pop(); | |
2141 assert(saved_sp == _sp, "must have correct argument count"); | |
2142 | |
2143 // Null check receiver. | |
2144 _sp += nargs; | |
2145 do_null_check(receiver, T_OBJECT); | |
2146 _sp -= nargs; | |
2147 if (stopped()) { | |
2148 return true; | |
2149 } | |
2150 | |
2151 // Build field offset expression. | |
2152 // We currently rely on the cookies produced by Unsafe.xxxFieldOffset | |
2153 // to be plain byte offsets, which are also the same as those accepted | |
2154 // by oopDesc::field_base. | |
2155 assert(Unsafe_field_offset_to_byte_offset(11) == 11, "fieldOffset must be byte-scaled"); | |
2156 // 32-bit machines ignore the high half of long offsets | |
2157 offset = ConvL2X(offset); | |
2158 Node* adr = make_unsafe_address(base, offset); | |
2159 const TypePtr *adr_type = _gvn.type(adr)->isa_ptr(); | |
2160 | |
2161 // (Unlike inline_unsafe_access, there seems no point in trying | |
2162 // to refine types. Just use the coarse types here. | |
2163 const Type *value_type = Type::get_const_basic_type(type); | |
2164 Compile::AliasType* alias_type = C->alias_type(adr_type); | |
2165 assert(alias_type->index() != Compile::AliasIdxBot, "no bare pointers here"); | |
2166 int alias_idx = C->get_alias_index(adr_type); | |
2167 | |
2168 // Memory-model-wise, a CAS acts like a little synchronized block, | |
2169 // so needs barriers on each side. These don't't translate into | |
2170 // actual barriers on most machines, but we still need rest of | |
2171 // compiler to respect ordering. | |
2172 | |
2173 insert_mem_bar(Op_MemBarRelease); | |
2174 insert_mem_bar(Op_MemBarCPUOrder); | |
2175 | |
2176 // 4984716: MemBars must be inserted before this | |
2177 // memory node in order to avoid a false | |
2178 // dependency which will confuse the scheduler. | |
2179 Node *mem = memory(alias_idx); | |
2180 | |
2181 // For now, we handle only those cases that actually exist: ints, | |
2182 // longs, and Object. Adding others should be straightforward. | |
2183 Node* cas; | |
2184 switch(type) { | |
2185 case T_INT: | |
2186 cas = _gvn.transform(new (C, 5) CompareAndSwapINode(control(), mem, adr, newval, oldval)); | |
2187 break; | |
2188 case T_LONG: | |
2189 cas = _gvn.transform(new (C, 5) CompareAndSwapLNode(control(), mem, adr, newval, oldval)); | |
2190 break; | |
2191 case T_OBJECT: | |
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2192 // reference stores need a store barrier. |
0 | 2193 // (They don't if CAS fails, but it isn't worth checking.) |
2194 pre_barrier(control(), base, adr, alias_idx, newval, value_type, T_OBJECT); | |
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2195 #ifdef _LP64 |
163 | 2196 if (adr->bottom_type()->is_ptr_to_narrowoop()) { |
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2197 Node *newval_enc = _gvn.transform(new (C, 2) EncodePNode(newval, newval->bottom_type()->make_narrowoop())); |
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2198 Node *oldval_enc = _gvn.transform(new (C, 2) EncodePNode(oldval, oldval->bottom_type()->make_narrowoop())); |
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2199 cas = _gvn.transform(new (C, 5) CompareAndSwapNNode(control(), mem, adr, |
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2200 newval_enc, oldval_enc)); |
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2201 } else |
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2202 #endif |
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2203 { |
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2204 cas = _gvn.transform(new (C, 5) CompareAndSwapPNode(control(), mem, adr, newval, oldval)); |
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2205 } |
0 | 2206 post_barrier(control(), cas, base, adr, alias_idx, newval, T_OBJECT, true); |
2207 break; | |
2208 default: | |
2209 ShouldNotReachHere(); | |
2210 break; | |
2211 } | |
2212 | |
2213 // SCMemProjNodes represent the memory state of CAS. Their main | |
2214 // role is to prevent CAS nodes from being optimized away when their | |
2215 // results aren't used. | |
2216 Node* proj = _gvn.transform( new (C, 1) SCMemProjNode(cas)); | |
2217 set_memory(proj, alias_idx); | |
2218 | |
2219 // Add the trailing membar surrounding the access | |
2220 insert_mem_bar(Op_MemBarCPUOrder); | |
2221 insert_mem_bar(Op_MemBarAcquire); | |
2222 | |
2223 push(cas); | |
2224 return true; | |
2225 } | |
2226 | |
2227 bool LibraryCallKit::inline_unsafe_ordered_store(BasicType type) { | |
2228 // This is another variant of inline_unsafe_access, differing in | |
2229 // that it always issues store-store ("release") barrier and ensures | |
2230 // store-atomicity (which only matters for "long"). | |
2231 | |
2232 if (callee()->is_static()) return false; // caller must have the capability! | |
2233 | |
2234 #ifndef PRODUCT | |
2235 { | |
2236 ResourceMark rm; | |
2237 // Check the signatures. | |
2238 ciSignature* sig = signature(); | |
2239 #ifdef ASSERT | |
2240 BasicType rtype = sig->return_type()->basic_type(); | |
2241 assert(rtype == T_VOID, "must return void"); | |
2242 assert(sig->count() == 3, "has 3 arguments"); | |
2243 assert(sig->type_at(0)->basic_type() == T_OBJECT, "base is object"); | |
2244 assert(sig->type_at(1)->basic_type() == T_LONG, "offset is long"); | |
2245 #endif // ASSERT | |
2246 } | |
2247 #endif //PRODUCT | |
2248 | |
2249 // number of stack slots per value argument (1 or 2) | |
2250 int type_words = type2size[type]; | |
2251 | |
2252 C->set_has_unsafe_access(true); // Mark eventual nmethod as "unsafe". | |
2253 | |
2254 // Argument words: "this" plus oop plus offset plus value; | |
2255 int nargs = 1 + 1 + 2 + type_words; | |
2256 | |
2257 // pop arguments: val, offset, base, and receiver | |
2258 debug_only(int saved_sp = _sp); | |
2259 _sp += nargs; | |
2260 Node* val = (type_words == 1) ? pop() : pop_pair(); | |
2261 Node *offset = pop_pair(); | |
2262 Node *base = pop(); | |
2263 Node *receiver = pop(); | |
2264 assert(saved_sp == _sp, "must have correct argument count"); | |
2265 | |
2266 // Null check receiver. | |
2267 _sp += nargs; | |
2268 do_null_check(receiver, T_OBJECT); | |
2269 _sp -= nargs; | |
2270 if (stopped()) { | |
2271 return true; | |
2272 } | |
2273 | |
2274 // Build field offset expression. | |
2275 assert(Unsafe_field_offset_to_byte_offset(11) == 11, "fieldOffset must be byte-scaled"); | |
2276 // 32-bit machines ignore the high half of long offsets | |
2277 offset = ConvL2X(offset); | |
2278 Node* adr = make_unsafe_address(base, offset); | |
2279 const TypePtr *adr_type = _gvn.type(adr)->isa_ptr(); | |
2280 const Type *value_type = Type::get_const_basic_type(type); | |
2281 Compile::AliasType* alias_type = C->alias_type(adr_type); | |
2282 | |
2283 insert_mem_bar(Op_MemBarRelease); | |
2284 insert_mem_bar(Op_MemBarCPUOrder); | |
2285 // Ensure that the store is atomic for longs: | |
2286 bool require_atomic_access = true; | |
2287 Node* store; | |
2288 if (type == T_OBJECT) // reference stores need a store barrier. | |
2289 store = store_oop_to_unknown(control(), base, adr, adr_type, val, value_type, type); | |
2290 else { | |
2291 store = store_to_memory(control(), adr, val, type, adr_type, require_atomic_access); | |
2292 } | |
2293 insert_mem_bar(Op_MemBarCPUOrder); | |
2294 return true; | |
2295 } | |
2296 | |
2297 bool LibraryCallKit::inline_unsafe_allocate() { | |
2298 if (callee()->is_static()) return false; // caller must have the capability! | |
2299 int nargs = 1 + 1; | |
2300 assert(signature()->size() == nargs-1, "alloc has 1 argument"); | |
2301 null_check_receiver(callee()); // check then ignore argument(0) | |
2302 _sp += nargs; // set original stack for use by uncommon_trap | |
2303 Node* cls = do_null_check(argument(1), T_OBJECT); | |
2304 _sp -= nargs; | |
2305 if (stopped()) return true; | |
2306 | |
2307 Node* kls = load_klass_from_mirror(cls, false, nargs, NULL, 0); | |
2308 _sp += nargs; // set original stack for use by uncommon_trap | |
2309 kls = do_null_check(kls, T_OBJECT); | |
2310 _sp -= nargs; | |
2311 if (stopped()) return true; // argument was like int.class | |
2312 | |
2313 // Note: The argument might still be an illegal value like | |
2314 // Serializable.class or Object[].class. The runtime will handle it. | |
2315 // But we must make an explicit check for initialization. | |
2316 Node* insp = basic_plus_adr(kls, instanceKlass::init_state_offset_in_bytes() + sizeof(oopDesc)); | |
2317 Node* inst = make_load(NULL, insp, TypeInt::INT, T_INT); | |
2318 Node* bits = intcon(instanceKlass::fully_initialized); | |
2319 Node* test = _gvn.transform( new (C, 3) SubINode(inst, bits) ); | |
2320 // The 'test' is non-zero if we need to take a slow path. | |
2321 | |
2322 Node* obj = new_instance(kls, test); | |
2323 push(obj); | |
2324 | |
2325 return true; | |
2326 } | |
2327 | |
2328 //------------------------inline_native_time_funcs-------------- | |
2329 // inline code for System.currentTimeMillis() and System.nanoTime() | |
2330 // these have the same type and signature | |
2331 bool LibraryCallKit::inline_native_time_funcs(bool isNano) { | |
2332 address funcAddr = isNano ? CAST_FROM_FN_PTR(address, os::javaTimeNanos) : | |
2333 CAST_FROM_FN_PTR(address, os::javaTimeMillis); | |
2334 const char * funcName = isNano ? "nanoTime" : "currentTimeMillis"; | |
2335 const TypeFunc *tf = OptoRuntime::current_time_millis_Type(); | |
2336 const TypePtr* no_memory_effects = NULL; | |
2337 Node* time = make_runtime_call(RC_LEAF, tf, funcAddr, funcName, no_memory_effects); | |
2338 Node* value = _gvn.transform(new (C, 1) ProjNode(time, TypeFunc::Parms+0)); | |
2339 #ifdef ASSERT | |
2340 Node* value_top = _gvn.transform(new (C, 1) ProjNode(time, TypeFunc::Parms + 1)); | |
2341 assert(value_top == top(), "second value must be top"); | |
2342 #endif | |
2343 push_pair(value); | |
2344 return true; | |
2345 } | |
2346 | |
2347 //------------------------inline_native_currentThread------------------ | |
2348 bool LibraryCallKit::inline_native_currentThread() { | |
2349 Node* junk = NULL; | |
2350 push(generate_current_thread(junk)); | |
2351 return true; | |
2352 } | |
2353 | |
2354 //------------------------inline_native_isInterrupted------------------ | |
2355 bool LibraryCallKit::inline_native_isInterrupted() { | |
2356 const int nargs = 1+1; // receiver + boolean | |
2357 assert(nargs == arg_size(), "sanity"); | |
2358 // Add a fast path to t.isInterrupted(clear_int): | |
2359 // (t == Thread.current() && (!TLS._osthread._interrupted || !clear_int)) | |
2360 // ? TLS._osthread._interrupted : /*slow path:*/ t.isInterrupted(clear_int) | |
2361 // So, in the common case that the interrupt bit is false, | |
2362 // we avoid making a call into the VM. Even if the interrupt bit | |
2363 // is true, if the clear_int argument is false, we avoid the VM call. | |
2364 // However, if the receiver is not currentThread, we must call the VM, | |
2365 // because there must be some locking done around the operation. | |
2366 | |
2367 // We only go to the fast case code if we pass two guards. | |
2368 // Paths which do not pass are accumulated in the slow_region. | |
2369 RegionNode* slow_region = new (C, 1) RegionNode(1); | |
2370 record_for_igvn(slow_region); | |
2371 RegionNode* result_rgn = new (C, 4) RegionNode(1+3); // fast1, fast2, slow | |
2372 PhiNode* result_val = new (C, 4) PhiNode(result_rgn, TypeInt::BOOL); | |
2373 enum { no_int_result_path = 1, | |
2374 no_clear_result_path = 2, | |
2375 slow_result_path = 3 | |
2376 }; | |
2377 | |
2378 // (a) Receiving thread must be the current thread. | |
2379 Node* rec_thr = argument(0); | |
2380 Node* tls_ptr = NULL; | |
2381 Node* cur_thr = generate_current_thread(tls_ptr); | |
2382 Node* cmp_thr = _gvn.transform( new (C, 3) CmpPNode(cur_thr, rec_thr) ); | |
2383 Node* bol_thr = _gvn.transform( new (C, 2) BoolNode(cmp_thr, BoolTest::ne) ); | |
2384 | |
2385 bool known_current_thread = (_gvn.type(bol_thr) == TypeInt::ZERO); | |
2386 if (!known_current_thread) | |
2387 generate_slow_guard(bol_thr, slow_region); | |
2388 | |
2389 // (b) Interrupt bit on TLS must be false. | |
2390 Node* p = basic_plus_adr(top()/*!oop*/, tls_ptr, in_bytes(JavaThread::osthread_offset())); | |
2391 Node* osthread = make_load(NULL, p, TypeRawPtr::NOTNULL, T_ADDRESS); | |
2392 p = basic_plus_adr(top()/*!oop*/, osthread, in_bytes(OSThread::interrupted_offset())); | |
2393 Node* int_bit = make_load(NULL, p, TypeInt::BOOL, T_INT); | |
2394 Node* cmp_bit = _gvn.transform( new (C, 3) CmpINode(int_bit, intcon(0)) ); | |
2395 Node* bol_bit = _gvn.transform( new (C, 2) BoolNode(cmp_bit, BoolTest::ne) ); | |
2396 | |
2397 IfNode* iff_bit = create_and_map_if(control(), bol_bit, PROB_UNLIKELY_MAG(3), COUNT_UNKNOWN); | |
2398 | |
2399 // First fast path: if (!TLS._interrupted) return false; | |
2400 Node* false_bit = _gvn.transform( new (C, 1) IfFalseNode(iff_bit) ); | |
2401 result_rgn->init_req(no_int_result_path, false_bit); | |
2402 result_val->init_req(no_int_result_path, intcon(0)); | |
2403 | |
2404 // drop through to next case | |
2405 set_control( _gvn.transform(new (C, 1) IfTrueNode(iff_bit)) ); | |
2406 | |
2407 // (c) Or, if interrupt bit is set and clear_int is false, use 2nd fast path. | |
2408 Node* clr_arg = argument(1); | |
2409 Node* cmp_arg = _gvn.transform( new (C, 3) CmpINode(clr_arg, intcon(0)) ); | |
2410 Node* bol_arg = _gvn.transform( new (C, 2) BoolNode(cmp_arg, BoolTest::ne) ); | |
2411 IfNode* iff_arg = create_and_map_if(control(), bol_arg, PROB_FAIR, COUNT_UNKNOWN); | |
2412 | |
2413 // Second fast path: ... else if (!clear_int) return true; | |
2414 Node* false_arg = _gvn.transform( new (C, 1) IfFalseNode(iff_arg) ); | |
2415 result_rgn->init_req(no_clear_result_path, false_arg); | |
2416 result_val->init_req(no_clear_result_path, intcon(1)); | |
2417 | |
2418 // drop through to next case | |
2419 set_control( _gvn.transform(new (C, 1) IfTrueNode(iff_arg)) ); | |
2420 | |
2421 // (d) Otherwise, go to the slow path. | |
2422 slow_region->add_req(control()); | |
2423 set_control( _gvn.transform(slow_region) ); | |
2424 | |
2425 if (stopped()) { | |
2426 // There is no slow path. | |
2427 result_rgn->init_req(slow_result_path, top()); | |
2428 result_val->init_req(slow_result_path, top()); | |
2429 } else { | |
2430 // non-virtual because it is a private non-static | |
2431 CallJavaNode* slow_call = generate_method_call(vmIntrinsics::_isInterrupted); | |
2432 | |
2433 Node* slow_val = set_results_for_java_call(slow_call); | |
2434 // this->control() comes from set_results_for_java_call | |
2435 | |
2436 // If we know that the result of the slow call will be true, tell the optimizer! | |
2437 if (known_current_thread) slow_val = intcon(1); | |
2438 | |
2439 Node* fast_io = slow_call->in(TypeFunc::I_O); | |
2440 Node* fast_mem = slow_call->in(TypeFunc::Memory); | |
2441 // These two phis are pre-filled with copies of of the fast IO and Memory | |
2442 Node* io_phi = PhiNode::make(result_rgn, fast_io, Type::ABIO); | |
2443 Node* mem_phi = PhiNode::make(result_rgn, fast_mem, Type::MEMORY, TypePtr::BOTTOM); | |
2444 | |
2445 result_rgn->init_req(slow_result_path, control()); | |
2446 io_phi ->init_req(slow_result_path, i_o()); | |
2447 mem_phi ->init_req(slow_result_path, reset_memory()); | |
2448 result_val->init_req(slow_result_path, slow_val); | |
2449 | |
2450 set_all_memory( _gvn.transform(mem_phi) ); | |
2451 set_i_o( _gvn.transform(io_phi) ); | |
2452 } | |
2453 | |
2454 push_result(result_rgn, result_val); | |
2455 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2456 | |
2457 return true; | |
2458 } | |
2459 | |
2460 //---------------------------load_mirror_from_klass---------------------------- | |
2461 // Given a klass oop, load its java mirror (a java.lang.Class oop). | |
2462 Node* LibraryCallKit::load_mirror_from_klass(Node* klass) { | |
2463 Node* p = basic_plus_adr(klass, Klass::java_mirror_offset_in_bytes() + sizeof(oopDesc)); | |
2464 return make_load(NULL, p, TypeInstPtr::MIRROR, T_OBJECT); | |
2465 } | |
2466 | |
2467 //-----------------------load_klass_from_mirror_common------------------------- | |
2468 // Given a java mirror (a java.lang.Class oop), load its corresponding klass oop. | |
2469 // Test the klass oop for null (signifying a primitive Class like Integer.TYPE), | |
2470 // and branch to the given path on the region. | |
2471 // If never_see_null, take an uncommon trap on null, so we can optimistically | |
2472 // compile for the non-null case. | |
2473 // If the region is NULL, force never_see_null = true. | |
2474 Node* LibraryCallKit::load_klass_from_mirror_common(Node* mirror, | |
2475 bool never_see_null, | |
2476 int nargs, | |
2477 RegionNode* region, | |
2478 int null_path, | |
2479 int offset) { | |
2480 if (region == NULL) never_see_null = true; | |
2481 Node* p = basic_plus_adr(mirror, offset); | |
2482 const TypeKlassPtr* kls_type = TypeKlassPtr::OBJECT_OR_NULL; | |
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2483 Node* kls = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeRawPtr::BOTTOM, kls_type) ); |
0 | 2484 _sp += nargs; // any deopt will start just before call to enclosing method |
2485 Node* null_ctl = top(); | |
2486 kls = null_check_oop(kls, &null_ctl, never_see_null); | |
2487 if (region != NULL) { | |
2488 // Set region->in(null_path) if the mirror is a primitive (e.g, int.class). | |
2489 region->init_req(null_path, null_ctl); | |
2490 } else { | |
2491 assert(null_ctl == top(), "no loose ends"); | |
2492 } | |
2493 _sp -= nargs; | |
2494 return kls; | |
2495 } | |
2496 | |
2497 //--------------------(inline_native_Class_query helpers)--------------------- | |
2498 // Use this for JVM_ACC_INTERFACE, JVM_ACC_IS_CLONEABLE, JVM_ACC_HAS_FINALIZER. | |
2499 // Fall through if (mods & mask) == bits, take the guard otherwise. | |
2500 Node* LibraryCallKit::generate_access_flags_guard(Node* kls, int modifier_mask, int modifier_bits, RegionNode* region) { | |
2501 // Branch around if the given klass has the given modifier bit set. | |
2502 // Like generate_guard, adds a new path onto the region. | |
2503 Node* modp = basic_plus_adr(kls, Klass::access_flags_offset_in_bytes() + sizeof(oopDesc)); | |
2504 Node* mods = make_load(NULL, modp, TypeInt::INT, T_INT); | |
2505 Node* mask = intcon(modifier_mask); | |
2506 Node* bits = intcon(modifier_bits); | |
2507 Node* mbit = _gvn.transform( new (C, 3) AndINode(mods, mask) ); | |
2508 Node* cmp = _gvn.transform( new (C, 3) CmpINode(mbit, bits) ); | |
2509 Node* bol = _gvn.transform( new (C, 2) BoolNode(cmp, BoolTest::ne) ); | |
2510 return generate_fair_guard(bol, region); | |
2511 } | |
2512 Node* LibraryCallKit::generate_interface_guard(Node* kls, RegionNode* region) { | |
2513 return generate_access_flags_guard(kls, JVM_ACC_INTERFACE, 0, region); | |
2514 } | |
2515 | |
2516 //-------------------------inline_native_Class_query------------------- | |
2517 bool LibraryCallKit::inline_native_Class_query(vmIntrinsics::ID id) { | |
2518 int nargs = 1+0; // just the Class mirror, in most cases | |
2519 const Type* return_type = TypeInt::BOOL; | |
2520 Node* prim_return_value = top(); // what happens if it's a primitive class? | |
2521 bool never_see_null = !too_many_traps(Deoptimization::Reason_null_check); | |
2522 bool expect_prim = false; // most of these guys expect to work on refs | |
2523 | |
2524 enum { _normal_path = 1, _prim_path = 2, PATH_LIMIT }; | |
2525 | |
2526 switch (id) { | |
2527 case vmIntrinsics::_isInstance: | |
2528 nargs = 1+1; // the Class mirror, plus the object getting queried about | |
2529 // nothing is an instance of a primitive type | |
2530 prim_return_value = intcon(0); | |
2531 break; | |
2532 case vmIntrinsics::_getModifiers: | |
2533 prim_return_value = intcon(JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC); | |
2534 assert(is_power_of_2((int)JVM_ACC_WRITTEN_FLAGS+1), "change next line"); | |
2535 return_type = TypeInt::make(0, JVM_ACC_WRITTEN_FLAGS, Type::WidenMin); | |
2536 break; | |
2537 case vmIntrinsics::_isInterface: | |
2538 prim_return_value = intcon(0); | |
2539 break; | |
2540 case vmIntrinsics::_isArray: | |
2541 prim_return_value = intcon(0); | |
2542 expect_prim = true; // cf. ObjectStreamClass.getClassSignature | |
2543 break; | |
2544 case vmIntrinsics::_isPrimitive: | |
2545 prim_return_value = intcon(1); | |
2546 expect_prim = true; // obviously | |
2547 break; | |
2548 case vmIntrinsics::_getSuperclass: | |
2549 prim_return_value = null(); | |
2550 return_type = TypeInstPtr::MIRROR->cast_to_ptr_type(TypePtr::BotPTR); | |
2551 break; | |
2552 case vmIntrinsics::_getComponentType: | |
2553 prim_return_value = null(); | |
2554 return_type = TypeInstPtr::MIRROR->cast_to_ptr_type(TypePtr::BotPTR); | |
2555 break; | |
2556 case vmIntrinsics::_getClassAccessFlags: | |
2557 prim_return_value = intcon(JVM_ACC_ABSTRACT | JVM_ACC_FINAL | JVM_ACC_PUBLIC); | |
2558 return_type = TypeInt::INT; // not bool! 6297094 | |
2559 break; | |
2560 default: | |
2561 ShouldNotReachHere(); | |
2562 } | |
2563 | |
2564 Node* mirror = argument(0); | |
2565 Node* obj = (nargs <= 1)? top(): argument(1); | |
2566 | |
2567 const TypeInstPtr* mirror_con = _gvn.type(mirror)->isa_instptr(); | |
2568 if (mirror_con == NULL) return false; // cannot happen? | |
2569 | |
2570 #ifndef PRODUCT | |
2571 if (PrintIntrinsics || PrintInlining || PrintOptoInlining) { | |
2572 ciType* k = mirror_con->java_mirror_type(); | |
2573 if (k) { | |
2574 tty->print("Inlining %s on constant Class ", vmIntrinsics::name_at(intrinsic_id())); | |
2575 k->print_name(); | |
2576 tty->cr(); | |
2577 } | |
2578 } | |
2579 #endif | |
2580 | |
2581 // Null-check the mirror, and the mirror's klass ptr (in case it is a primitive). | |
2582 RegionNode* region = new (C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
2583 record_for_igvn(region); | |
2584 PhiNode* phi = new (C, PATH_LIMIT) PhiNode(region, return_type); | |
2585 | |
2586 // The mirror will never be null of Reflection.getClassAccessFlags, however | |
2587 // it may be null for Class.isInstance or Class.getModifiers. Throw a NPE | |
2588 // if it is. See bug 4774291. | |
2589 | |
2590 // For Reflection.getClassAccessFlags(), the null check occurs in | |
2591 // the wrong place; see inline_unsafe_access(), above, for a similar | |
2592 // situation. | |
2593 _sp += nargs; // set original stack for use by uncommon_trap | |
2594 mirror = do_null_check(mirror, T_OBJECT); | |
2595 _sp -= nargs; | |
2596 // If mirror or obj is dead, only null-path is taken. | |
2597 if (stopped()) return true; | |
2598 | |
2599 if (expect_prim) never_see_null = false; // expect nulls (meaning prims) | |
2600 | |
2601 // Now load the mirror's klass metaobject, and null-check it. | |
2602 // Side-effects region with the control path if the klass is null. | |
2603 Node* kls = load_klass_from_mirror(mirror, never_see_null, nargs, | |
2604 region, _prim_path); | |
2605 // If kls is null, we have a primitive mirror. | |
2606 phi->init_req(_prim_path, prim_return_value); | |
2607 if (stopped()) { push_result(region, phi); return true; } | |
2608 | |
2609 Node* p; // handy temp | |
2610 Node* null_ctl; | |
2611 | |
2612 // Now that we have the non-null klass, we can perform the real query. | |
2613 // For constant classes, the query will constant-fold in LoadNode::Value. | |
2614 Node* query_value = top(); | |
2615 switch (id) { | |
2616 case vmIntrinsics::_isInstance: | |
2617 // nothing is an instance of a primitive type | |
2618 query_value = gen_instanceof(obj, kls); | |
2619 break; | |
2620 | |
2621 case vmIntrinsics::_getModifiers: | |
2622 p = basic_plus_adr(kls, Klass::modifier_flags_offset_in_bytes() + sizeof(oopDesc)); | |
2623 query_value = make_load(NULL, p, TypeInt::INT, T_INT); | |
2624 break; | |
2625 | |
2626 case vmIntrinsics::_isInterface: | |
2627 // (To verify this code sequence, check the asserts in JVM_IsInterface.) | |
2628 if (generate_interface_guard(kls, region) != NULL) | |
2629 // A guard was added. If the guard is taken, it was an interface. | |
2630 phi->add_req(intcon(1)); | |
2631 // If we fall through, it's a plain class. | |
2632 query_value = intcon(0); | |
2633 break; | |
2634 | |
2635 case vmIntrinsics::_isArray: | |
2636 // (To verify this code sequence, check the asserts in JVM_IsArrayClass.) | |
2637 if (generate_array_guard(kls, region) != NULL) | |
2638 // A guard was added. If the guard is taken, it was an array. | |
2639 phi->add_req(intcon(1)); | |
2640 // If we fall through, it's a plain class. | |
2641 query_value = intcon(0); | |
2642 break; | |
2643 | |
2644 case vmIntrinsics::_isPrimitive: | |
2645 query_value = intcon(0); // "normal" path produces false | |
2646 break; | |
2647 | |
2648 case vmIntrinsics::_getSuperclass: | |
2649 // The rules here are somewhat unfortunate, but we can still do better | |
2650 // with random logic than with a JNI call. | |
2651 // Interfaces store null or Object as _super, but must report null. | |
2652 // Arrays store an intermediate super as _super, but must report Object. | |
2653 // Other types can report the actual _super. | |
2654 // (To verify this code sequence, check the asserts in JVM_IsInterface.) | |
2655 if (generate_interface_guard(kls, region) != NULL) | |
2656 // A guard was added. If the guard is taken, it was an interface. | |
2657 phi->add_req(null()); | |
2658 if (generate_array_guard(kls, region) != NULL) | |
2659 // A guard was added. If the guard is taken, it was an array. | |
2660 phi->add_req(makecon(TypeInstPtr::make(env()->Object_klass()->java_mirror()))); | |
2661 // If we fall through, it's a plain class. Get its _super. | |
2662 p = basic_plus_adr(kls, Klass::super_offset_in_bytes() + sizeof(oopDesc)); | |
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2663 kls = _gvn.transform( LoadKlassNode::make(_gvn, immutable_memory(), p, TypeRawPtr::BOTTOM, TypeKlassPtr::OBJECT_OR_NULL) ); |
0 | 2664 null_ctl = top(); |
2665 kls = null_check_oop(kls, &null_ctl); | |
2666 if (null_ctl != top()) { | |
2667 // If the guard is taken, Object.superClass is null (both klass and mirror). | |
2668 region->add_req(null_ctl); | |
2669 phi ->add_req(null()); | |
2670 } | |
2671 if (!stopped()) { | |
2672 query_value = load_mirror_from_klass(kls); | |
2673 } | |
2674 break; | |
2675 | |
2676 case vmIntrinsics::_getComponentType: | |
2677 if (generate_array_guard(kls, region) != NULL) { | |
2678 // Be sure to pin the oop load to the guard edge just created: | |
2679 Node* is_array_ctrl = region->in(region->req()-1); | |
2680 Node* cma = basic_plus_adr(kls, in_bytes(arrayKlass::component_mirror_offset()) + sizeof(oopDesc)); | |
2681 Node* cmo = make_load(is_array_ctrl, cma, TypeInstPtr::MIRROR, T_OBJECT); | |
2682 phi->add_req(cmo); | |
2683 } | |
2684 query_value = null(); // non-array case is null | |
2685 break; | |
2686 | |
2687 case vmIntrinsics::_getClassAccessFlags: | |
2688 p = basic_plus_adr(kls, Klass::access_flags_offset_in_bytes() + sizeof(oopDesc)); | |
2689 query_value = make_load(NULL, p, TypeInt::INT, T_INT); | |
2690 break; | |
2691 | |
2692 default: | |
2693 ShouldNotReachHere(); | |
2694 } | |
2695 | |
2696 // Fall-through is the normal case of a query to a real class. | |
2697 phi->init_req(1, query_value); | |
2698 region->init_req(1, control()); | |
2699 | |
2700 push_result(region, phi); | |
2701 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2702 | |
2703 return true; | |
2704 } | |
2705 | |
2706 //--------------------------inline_native_subtype_check------------------------ | |
2707 // This intrinsic takes the JNI calls out of the heart of | |
2708 // UnsafeFieldAccessorImpl.set, which improves Field.set, readObject, etc. | |
2709 bool LibraryCallKit::inline_native_subtype_check() { | |
2710 int nargs = 1+1; // the Class mirror, plus the other class getting examined | |
2711 | |
2712 // Pull both arguments off the stack. | |
2713 Node* args[2]; // two java.lang.Class mirrors: superc, subc | |
2714 args[0] = argument(0); | |
2715 args[1] = argument(1); | |
2716 Node* klasses[2]; // corresponding Klasses: superk, subk | |
2717 klasses[0] = klasses[1] = top(); | |
2718 | |
2719 enum { | |
2720 // A full decision tree on {superc is prim, subc is prim}: | |
2721 _prim_0_path = 1, // {P,N} => false | |
2722 // {P,P} & superc!=subc => false | |
2723 _prim_same_path, // {P,P} & superc==subc => true | |
2724 _prim_1_path, // {N,P} => false | |
2725 _ref_subtype_path, // {N,N} & subtype check wins => true | |
2726 _both_ref_path, // {N,N} & subtype check loses => false | |
2727 PATH_LIMIT | |
2728 }; | |
2729 | |
2730 RegionNode* region = new (C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
2731 Node* phi = new (C, PATH_LIMIT) PhiNode(region, TypeInt::BOOL); | |
2732 record_for_igvn(region); | |
2733 | |
2734 const TypePtr* adr_type = TypeRawPtr::BOTTOM; // memory type of loads | |
2735 const TypeKlassPtr* kls_type = TypeKlassPtr::OBJECT_OR_NULL; | |
2736 int class_klass_offset = java_lang_Class::klass_offset_in_bytes(); | |
2737 | |
2738 // First null-check both mirrors and load each mirror's klass metaobject. | |
2739 int which_arg; | |
2740 for (which_arg = 0; which_arg <= 1; which_arg++) { | |
2741 Node* arg = args[which_arg]; | |
2742 _sp += nargs; // set original stack for use by uncommon_trap | |
2743 arg = do_null_check(arg, T_OBJECT); | |
2744 _sp -= nargs; | |
2745 if (stopped()) break; | |
2746 args[which_arg] = _gvn.transform(arg); | |
2747 | |
2748 Node* p = basic_plus_adr(arg, class_klass_offset); | |
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2749 Node* kls = LoadKlassNode::make(_gvn, immutable_memory(), p, adr_type, kls_type); |
0 | 2750 klasses[which_arg] = _gvn.transform(kls); |
2751 } | |
2752 | |
2753 // Having loaded both klasses, test each for null. | |
2754 bool never_see_null = !too_many_traps(Deoptimization::Reason_null_check); | |
2755 for (which_arg = 0; which_arg <= 1; which_arg++) { | |
2756 Node* kls = klasses[which_arg]; | |
2757 Node* null_ctl = top(); | |
2758 _sp += nargs; // set original stack for use by uncommon_trap | |
2759 kls = null_check_oop(kls, &null_ctl, never_see_null); | |
2760 _sp -= nargs; | |
2761 int prim_path = (which_arg == 0 ? _prim_0_path : _prim_1_path); | |
2762 region->init_req(prim_path, null_ctl); | |
2763 if (stopped()) break; | |
2764 klasses[which_arg] = kls; | |
2765 } | |
2766 | |
2767 if (!stopped()) { | |
2768 // now we have two reference types, in klasses[0..1] | |
2769 Node* subk = klasses[1]; // the argument to isAssignableFrom | |
2770 Node* superk = klasses[0]; // the receiver | |
2771 region->set_req(_both_ref_path, gen_subtype_check(subk, superk)); | |
2772 // now we have a successful reference subtype check | |
2773 region->set_req(_ref_subtype_path, control()); | |
2774 } | |
2775 | |
2776 // If both operands are primitive (both klasses null), then | |
2777 // we must return true when they are identical primitives. | |
2778 // It is convenient to test this after the first null klass check. | |
2779 set_control(region->in(_prim_0_path)); // go back to first null check | |
2780 if (!stopped()) { | |
2781 // Since superc is primitive, make a guard for the superc==subc case. | |
2782 Node* cmp_eq = _gvn.transform( new (C, 3) CmpPNode(args[0], args[1]) ); | |
2783 Node* bol_eq = _gvn.transform( new (C, 2) BoolNode(cmp_eq, BoolTest::eq) ); | |
2784 generate_guard(bol_eq, region, PROB_FAIR); | |
2785 if (region->req() == PATH_LIMIT+1) { | |
2786 // A guard was added. If the added guard is taken, superc==subc. | |
2787 region->swap_edges(PATH_LIMIT, _prim_same_path); | |
2788 region->del_req(PATH_LIMIT); | |
2789 } | |
2790 region->set_req(_prim_0_path, control()); // Not equal after all. | |
2791 } | |
2792 | |
2793 // these are the only paths that produce 'true': | |
2794 phi->set_req(_prim_same_path, intcon(1)); | |
2795 phi->set_req(_ref_subtype_path, intcon(1)); | |
2796 | |
2797 // pull together the cases: | |
2798 assert(region->req() == PATH_LIMIT, "sane region"); | |
2799 for (uint i = 1; i < region->req(); i++) { | |
2800 Node* ctl = region->in(i); | |
2801 if (ctl == NULL || ctl == top()) { | |
2802 region->set_req(i, top()); | |
2803 phi ->set_req(i, top()); | |
2804 } else if (phi->in(i) == NULL) { | |
2805 phi->set_req(i, intcon(0)); // all other paths produce 'false' | |
2806 } | |
2807 } | |
2808 | |
2809 set_control(_gvn.transform(region)); | |
2810 push(_gvn.transform(phi)); | |
2811 | |
2812 return true; | |
2813 } | |
2814 | |
2815 //---------------------generate_array_guard_common------------------------ | |
2816 Node* LibraryCallKit::generate_array_guard_common(Node* kls, RegionNode* region, | |
2817 bool obj_array, bool not_array) { | |
2818 // If obj_array/non_array==false/false: | |
2819 // Branch around if the given klass is in fact an array (either obj or prim). | |
2820 // If obj_array/non_array==false/true: | |
2821 // Branch around if the given klass is not an array klass of any kind. | |
2822 // If obj_array/non_array==true/true: | |
2823 // Branch around if the kls is not an oop array (kls is int[], String, etc.) | |
2824 // If obj_array/non_array==true/false: | |
2825 // Branch around if the kls is an oop array (Object[] or subtype) | |
2826 // | |
2827 // Like generate_guard, adds a new path onto the region. | |
2828 jint layout_con = 0; | |
2829 Node* layout_val = get_layout_helper(kls, layout_con); | |
2830 if (layout_val == NULL) { | |
2831 bool query = (obj_array | |
2832 ? Klass::layout_helper_is_objArray(layout_con) | |
2833 : Klass::layout_helper_is_javaArray(layout_con)); | |
2834 if (query == not_array) { | |
2835 return NULL; // never a branch | |
2836 } else { // always a branch | |
2837 Node* always_branch = control(); | |
2838 if (region != NULL) | |
2839 region->add_req(always_branch); | |
2840 set_control(top()); | |
2841 return always_branch; | |
2842 } | |
2843 } | |
2844 // Now test the correct condition. | |
2845 jint nval = (obj_array | |
2846 ? ((jint)Klass::_lh_array_tag_type_value | |
2847 << Klass::_lh_array_tag_shift) | |
2848 : Klass::_lh_neutral_value); | |
2849 Node* cmp = _gvn.transform( new(C, 3) CmpINode(layout_val, intcon(nval)) ); | |
2850 BoolTest::mask btest = BoolTest::lt; // correct for testing is_[obj]array | |
2851 // invert the test if we are looking for a non-array | |
2852 if (not_array) btest = BoolTest(btest).negate(); | |
2853 Node* bol = _gvn.transform( new(C, 2) BoolNode(cmp, btest) ); | |
2854 return generate_fair_guard(bol, region); | |
2855 } | |
2856 | |
2857 | |
2858 //-----------------------inline_native_newArray-------------------------- | |
2859 bool LibraryCallKit::inline_native_newArray() { | |
2860 int nargs = 2; | |
2861 Node* mirror = argument(0); | |
2862 Node* count_val = argument(1); | |
2863 | |
2864 _sp += nargs; // set original stack for use by uncommon_trap | |
2865 mirror = do_null_check(mirror, T_OBJECT); | |
2866 _sp -= nargs; | |
163 | 2867 // If mirror or obj is dead, only null-path is taken. |
2868 if (stopped()) return true; | |
0 | 2869 |
2870 enum { _normal_path = 1, _slow_path = 2, PATH_LIMIT }; | |
2871 RegionNode* result_reg = new(C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
2872 PhiNode* result_val = new(C, PATH_LIMIT) PhiNode(result_reg, | |
2873 TypeInstPtr::NOTNULL); | |
2874 PhiNode* result_io = new(C, PATH_LIMIT) PhiNode(result_reg, Type::ABIO); | |
2875 PhiNode* result_mem = new(C, PATH_LIMIT) PhiNode(result_reg, Type::MEMORY, | |
2876 TypePtr::BOTTOM); | |
2877 | |
2878 bool never_see_null = !too_many_traps(Deoptimization::Reason_null_check); | |
2879 Node* klass_node = load_array_klass_from_mirror(mirror, never_see_null, | |
2880 nargs, | |
2881 result_reg, _slow_path); | |
2882 Node* normal_ctl = control(); | |
2883 Node* no_array_ctl = result_reg->in(_slow_path); | |
2884 | |
2885 // Generate code for the slow case. We make a call to newArray(). | |
2886 set_control(no_array_ctl); | |
2887 if (!stopped()) { | |
2888 // Either the input type is void.class, or else the | |
2889 // array klass has not yet been cached. Either the | |
2890 // ensuing call will throw an exception, or else it | |
2891 // will cache the array klass for next time. | |
2892 PreserveJVMState pjvms(this); | |
2893 CallJavaNode* slow_call = generate_method_call_static(vmIntrinsics::_newArray); | |
2894 Node* slow_result = set_results_for_java_call(slow_call); | |
2895 // this->control() comes from set_results_for_java_call | |
2896 result_reg->set_req(_slow_path, control()); | |
2897 result_val->set_req(_slow_path, slow_result); | |
2898 result_io ->set_req(_slow_path, i_o()); | |
2899 result_mem->set_req(_slow_path, reset_memory()); | |
2900 } | |
2901 | |
2902 set_control(normal_ctl); | |
2903 if (!stopped()) { | |
2904 // Normal case: The array type has been cached in the java.lang.Class. | |
2905 // The following call works fine even if the array type is polymorphic. | |
2906 // It could be a dynamic mix of int[], boolean[], Object[], etc. | |
2907 _sp += nargs; // set original stack for use by uncommon_trap | |
2908 Node* obj = new_array(klass_node, count_val); | |
2909 _sp -= nargs; | |
2910 result_reg->init_req(_normal_path, control()); | |
2911 result_val->init_req(_normal_path, obj); | |
2912 result_io ->init_req(_normal_path, i_o()); | |
2913 result_mem->init_req(_normal_path, reset_memory()); | |
2914 } | |
2915 | |
2916 // Return the combined state. | |
2917 set_i_o( _gvn.transform(result_io) ); | |
2918 set_all_memory( _gvn.transform(result_mem) ); | |
2919 push_result(result_reg, result_val); | |
2920 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2921 | |
2922 return true; | |
2923 } | |
2924 | |
2925 //----------------------inline_native_getLength-------------------------- | |
2926 bool LibraryCallKit::inline_native_getLength() { | |
2927 if (too_many_traps(Deoptimization::Reason_intrinsic)) return false; | |
2928 | |
2929 int nargs = 1; | |
2930 Node* array = argument(0); | |
2931 | |
2932 _sp += nargs; // set original stack for use by uncommon_trap | |
2933 array = do_null_check(array, T_OBJECT); | |
2934 _sp -= nargs; | |
2935 | |
2936 // If array is dead, only null-path is taken. | |
2937 if (stopped()) return true; | |
2938 | |
2939 // Deoptimize if it is a non-array. | |
2940 Node* non_array = generate_non_array_guard(load_object_klass(array), NULL); | |
2941 | |
2942 if (non_array != NULL) { | |
2943 PreserveJVMState pjvms(this); | |
2944 set_control(non_array); | |
2945 _sp += nargs; // push the arguments back on the stack | |
2946 uncommon_trap(Deoptimization::Reason_intrinsic, | |
2947 Deoptimization::Action_maybe_recompile); | |
2948 } | |
2949 | |
2950 // If control is dead, only non-array-path is taken. | |
2951 if (stopped()) return true; | |
2952 | |
2953 // The works fine even if the array type is polymorphic. | |
2954 // It could be a dynamic mix of int[], boolean[], Object[], etc. | |
2955 push( load_array_length(array) ); | |
2956 | |
2957 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
2958 | |
2959 return true; | |
2960 } | |
2961 | |
2962 //------------------------inline_array_copyOf---------------------------- | |
2963 bool LibraryCallKit::inline_array_copyOf(bool is_copyOfRange) { | |
2964 if (too_many_traps(Deoptimization::Reason_intrinsic)) return false; | |
2965 | |
2966 // Restore the stack and pop off the arguments. | |
2967 int nargs = 3 + (is_copyOfRange? 1: 0); | |
2968 Node* original = argument(0); | |
2969 Node* start = is_copyOfRange? argument(1): intcon(0); | |
2970 Node* end = is_copyOfRange? argument(2): argument(1); | |
2971 Node* array_type_mirror = is_copyOfRange? argument(3): argument(2); | |
2972 | |
2973 _sp += nargs; // set original stack for use by uncommon_trap | |
2974 array_type_mirror = do_null_check(array_type_mirror, T_OBJECT); | |
2975 original = do_null_check(original, T_OBJECT); | |
2976 _sp -= nargs; | |
2977 | |
2978 // Check if a null path was taken unconditionally. | |
2979 if (stopped()) return true; | |
2980 | |
2981 Node* orig_length = load_array_length(original); | |
2982 | |
2983 Node* klass_node = load_klass_from_mirror(array_type_mirror, false, nargs, | |
2984 NULL, 0); | |
2985 _sp += nargs; // set original stack for use by uncommon_trap | |
2986 klass_node = do_null_check(klass_node, T_OBJECT); | |
2987 _sp -= nargs; | |
2988 | |
2989 RegionNode* bailout = new (C, 1) RegionNode(1); | |
2990 record_for_igvn(bailout); | |
2991 | |
2992 // Despite the generic type of Arrays.copyOf, the mirror might be int, int[], etc. | |
2993 // Bail out if that is so. | |
2994 Node* not_objArray = generate_non_objArray_guard(klass_node, bailout); | |
2995 if (not_objArray != NULL) { | |
2996 // Improve the klass node's type from the new optimistic assumption: | |
2997 ciKlass* ak = ciArrayKlass::make(env()->Object_klass()); | |
2998 const Type* akls = TypeKlassPtr::make(TypePtr::NotNull, ak, 0/*offset*/); | |
2999 Node* cast = new (C, 2) CastPPNode(klass_node, akls); | |
3000 cast->init_req(0, control()); | |
3001 klass_node = _gvn.transform(cast); | |
3002 } | |
3003 | |
3004 // Bail out if either start or end is negative. | |
3005 generate_negative_guard(start, bailout, &start); | |
3006 generate_negative_guard(end, bailout, &end); | |
3007 | |
3008 Node* length = end; | |
3009 if (_gvn.type(start) != TypeInt::ZERO) { | |
3010 length = _gvn.transform( new (C, 3) SubINode(end, start) ); | |
3011 } | |
3012 | |
3013 // Bail out if length is negative. | |
3014 // ...Not needed, since the new_array will throw the right exception. | |
3015 //generate_negative_guard(length, bailout, &length); | |
3016 | |
3017 if (bailout->req() > 1) { | |
3018 PreserveJVMState pjvms(this); | |
3019 set_control( _gvn.transform(bailout) ); | |
3020 _sp += nargs; // push the arguments back on the stack | |
3021 uncommon_trap(Deoptimization::Reason_intrinsic, | |
3022 Deoptimization::Action_maybe_recompile); | |
3023 } | |
3024 | |
3025 if (!stopped()) { | |
3026 // How many elements will we copy from the original? | |
3027 // The answer is MinI(orig_length - start, length). | |
3028 Node* orig_tail = _gvn.transform( new(C, 3) SubINode(orig_length, start) ); | |
3029 Node* moved = generate_min_max(vmIntrinsics::_min, orig_tail, length); | |
3030 | |
3031 _sp += nargs; // set original stack for use by uncommon_trap | |
3032 Node* newcopy = new_array(klass_node, length); | |
3033 _sp -= nargs; | |
3034 | |
3035 // Generate a direct call to the right arraycopy function(s). | |
3036 // We know the copy is disjoint but we might not know if the | |
3037 // oop stores need checking. | |
3038 // Extreme case: Arrays.copyOf((Integer[])x, 10, String[].class). | |
3039 // This will fail a store-check if x contains any non-nulls. | |
3040 bool disjoint_bases = true; | |
3041 bool length_never_negative = true; | |
3042 generate_arraycopy(TypeAryPtr::OOPS, T_OBJECT, | |
3043 original, start, newcopy, intcon(0), moved, | |
3044 nargs, disjoint_bases, length_never_negative); | |
3045 | |
3046 push(newcopy); | |
3047 } | |
3048 | |
3049 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
3050 | |
3051 return true; | |
3052 } | |
3053 | |
3054 | |
3055 //----------------------generate_virtual_guard--------------------------- | |
3056 // Helper for hashCode and clone. Peeks inside the vtable to avoid a call. | |
3057 Node* LibraryCallKit::generate_virtual_guard(Node* obj_klass, | |
3058 RegionNode* slow_region) { | |
3059 ciMethod* method = callee(); | |
3060 int vtable_index = method->vtable_index(); | |
3061 // Get the methodOop out of the appropriate vtable entry. | |
3062 int entry_offset = (instanceKlass::vtable_start_offset() + | |
3063 vtable_index*vtableEntry::size()) * wordSize + | |
3064 vtableEntry::method_offset_in_bytes(); | |
3065 Node* entry_addr = basic_plus_adr(obj_klass, entry_offset); | |
3066 Node* target_call = make_load(NULL, entry_addr, TypeInstPtr::NOTNULL, T_OBJECT); | |
3067 | |
3068 // Compare the target method with the expected method (e.g., Object.hashCode). | |
3069 const TypeInstPtr* native_call_addr = TypeInstPtr::make(method); | |
3070 | |
3071 Node* native_call = makecon(native_call_addr); | |
3072 Node* chk_native = _gvn.transform( new(C, 3) CmpPNode(target_call, native_call) ); | |
3073 Node* test_native = _gvn.transform( new(C, 2) BoolNode(chk_native, BoolTest::ne) ); | |
3074 | |
3075 return generate_slow_guard(test_native, slow_region); | |
3076 } | |
3077 | |
3078 //-----------------------generate_method_call---------------------------- | |
3079 // Use generate_method_call to make a slow-call to the real | |
3080 // method if the fast path fails. An alternative would be to | |
3081 // use a stub like OptoRuntime::slow_arraycopy_Java. | |
3082 // This only works for expanding the current library call, | |
3083 // not another intrinsic. (E.g., don't use this for making an | |
3084 // arraycopy call inside of the copyOf intrinsic.) | |
3085 CallJavaNode* | |
3086 LibraryCallKit::generate_method_call(vmIntrinsics::ID method_id, bool is_virtual, bool is_static) { | |
3087 // When compiling the intrinsic method itself, do not use this technique. | |
3088 guarantee(callee() != C->method(), "cannot make slow-call to self"); | |
3089 | |
3090 ciMethod* method = callee(); | |
3091 // ensure the JVMS we have will be correct for this call | |
3092 guarantee(method_id == method->intrinsic_id(), "must match"); | |
3093 | |
3094 const TypeFunc* tf = TypeFunc::make(method); | |
3095 int tfdc = tf->domain()->cnt(); | |
3096 CallJavaNode* slow_call; | |
3097 if (is_static) { | |
3098 assert(!is_virtual, ""); | |
3099 slow_call = new(C, tfdc) CallStaticJavaNode(tf, | |
3100 SharedRuntime::get_resolve_static_call_stub(), | |
3101 method, bci()); | |
3102 } else if (is_virtual) { | |
3103 null_check_receiver(method); | |
3104 int vtable_index = methodOopDesc::invalid_vtable_index; | |
3105 if (UseInlineCaches) { | |
3106 // Suppress the vtable call | |
3107 } else { | |
3108 // hashCode and clone are not a miranda methods, | |
3109 // so the vtable index is fixed. | |
3110 // No need to use the linkResolver to get it. | |
3111 vtable_index = method->vtable_index(); | |
3112 } | |
3113 slow_call = new(C, tfdc) CallDynamicJavaNode(tf, | |
3114 SharedRuntime::get_resolve_virtual_call_stub(), | |
3115 method, vtable_index, bci()); | |
3116 } else { // neither virtual nor static: opt_virtual | |
3117 null_check_receiver(method); | |
3118 slow_call = new(C, tfdc) CallStaticJavaNode(tf, | |
3119 SharedRuntime::get_resolve_opt_virtual_call_stub(), | |
3120 method, bci()); | |
3121 slow_call->set_optimized_virtual(true); | |
3122 } | |
3123 set_arguments_for_java_call(slow_call); | |
3124 set_edges_for_java_call(slow_call); | |
3125 return slow_call; | |
3126 } | |
3127 | |
3128 | |
3129 //------------------------------inline_native_hashcode-------------------- | |
3130 // Build special case code for calls to hashCode on an object. | |
3131 bool LibraryCallKit::inline_native_hashcode(bool is_virtual, bool is_static) { | |
3132 assert(is_static == callee()->is_static(), "correct intrinsic selection"); | |
3133 assert(!(is_virtual && is_static), "either virtual, special, or static"); | |
3134 | |
3135 enum { _slow_path = 1, _fast_path, _null_path, PATH_LIMIT }; | |
3136 | |
3137 RegionNode* result_reg = new(C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
3138 PhiNode* result_val = new(C, PATH_LIMIT) PhiNode(result_reg, | |
3139 TypeInt::INT); | |
3140 PhiNode* result_io = new(C, PATH_LIMIT) PhiNode(result_reg, Type::ABIO); | |
3141 PhiNode* result_mem = new(C, PATH_LIMIT) PhiNode(result_reg, Type::MEMORY, | |
3142 TypePtr::BOTTOM); | |
3143 Node* obj = NULL; | |
3144 if (!is_static) { | |
3145 // Check for hashing null object | |
3146 obj = null_check_receiver(callee()); | |
3147 if (stopped()) return true; // unconditionally null | |
3148 result_reg->init_req(_null_path, top()); | |
3149 result_val->init_req(_null_path, top()); | |
3150 } else { | |
3151 // Do a null check, and return zero if null. | |
3152 // System.identityHashCode(null) == 0 | |
3153 obj = argument(0); | |
3154 Node* null_ctl = top(); | |
3155 obj = null_check_oop(obj, &null_ctl); | |
3156 result_reg->init_req(_null_path, null_ctl); | |
3157 result_val->init_req(_null_path, _gvn.intcon(0)); | |
3158 } | |
3159 | |
3160 // Unconditionally null? Then return right away. | |
3161 if (stopped()) { | |
3162 set_control( result_reg->in(_null_path) ); | |
3163 if (!stopped()) | |
3164 push( result_val ->in(_null_path) ); | |
3165 return true; | |
3166 } | |
3167 | |
3168 // After null check, get the object's klass. | |
3169 Node* obj_klass = load_object_klass(obj); | |
3170 | |
3171 // This call may be virtual (invokevirtual) or bound (invokespecial). | |
3172 // For each case we generate slightly different code. | |
3173 | |
3174 // We only go to the fast case code if we pass a number of guards. The | |
3175 // paths which do not pass are accumulated in the slow_region. | |
3176 RegionNode* slow_region = new (C, 1) RegionNode(1); | |
3177 record_for_igvn(slow_region); | |
3178 | |
3179 // If this is a virtual call, we generate a funny guard. We pull out | |
3180 // the vtable entry corresponding to hashCode() from the target object. | |
3181 // If the target method which we are calling happens to be the native | |
3182 // Object hashCode() method, we pass the guard. We do not need this | |
3183 // guard for non-virtual calls -- the caller is known to be the native | |
3184 // Object hashCode(). | |
3185 if (is_virtual) { | |
3186 generate_virtual_guard(obj_klass, slow_region); | |
3187 } | |
3188 | |
3189 // Get the header out of the object, use LoadMarkNode when available | |
3190 Node* header_addr = basic_plus_adr(obj, oopDesc::mark_offset_in_bytes()); | |
3191 Node* header = make_load(NULL, header_addr, TypeRawPtr::BOTTOM, T_ADDRESS); | |
3192 header = _gvn.transform( new (C, 2) CastP2XNode(NULL, header) ); | |
3193 | |
3194 // Test the header to see if it is unlocked. | |
3195 Node *lock_mask = _gvn.MakeConX(markOopDesc::biased_lock_mask_in_place); | |
3196 Node *lmasked_header = _gvn.transform( new (C, 3) AndXNode(header, lock_mask) ); | |
3197 Node *unlocked_val = _gvn.MakeConX(markOopDesc::unlocked_value); | |
3198 Node *chk_unlocked = _gvn.transform( new (C, 3) CmpXNode( lmasked_header, unlocked_val)); | |
3199 Node *test_unlocked = _gvn.transform( new (C, 2) BoolNode( chk_unlocked, BoolTest::ne) ); | |
3200 | |
3201 generate_slow_guard(test_unlocked, slow_region); | |
3202 | |
3203 // Get the hash value and check to see that it has been properly assigned. | |
3204 // We depend on hash_mask being at most 32 bits and avoid the use of | |
3205 // hash_mask_in_place because it could be larger than 32 bits in a 64-bit | |
3206 // vm: see markOop.hpp. | |
3207 Node *hash_mask = _gvn.intcon(markOopDesc::hash_mask); | |
3208 Node *hash_shift = _gvn.intcon(markOopDesc::hash_shift); | |
3209 Node *hshifted_header= _gvn.transform( new (C, 3) URShiftXNode(header, hash_shift) ); | |
3210 // This hack lets the hash bits live anywhere in the mark object now, as long | |
3211 // as the shift drops the relevent bits into the low 32 bits. Note that | |
3212 // Java spec says that HashCode is an int so there's no point in capturing | |
3213 // an 'X'-sized hashcode (32 in 32-bit build or 64 in 64-bit build). | |
3214 hshifted_header = ConvX2I(hshifted_header); | |
3215 Node *hash_val = _gvn.transform( new (C, 3) AndINode(hshifted_header, hash_mask) ); | |
3216 | |
3217 Node *no_hash_val = _gvn.intcon(markOopDesc::no_hash); | |
3218 Node *chk_assigned = _gvn.transform( new (C, 3) CmpINode( hash_val, no_hash_val)); | |
3219 Node *test_assigned = _gvn.transform( new (C, 2) BoolNode( chk_assigned, BoolTest::eq) ); | |
3220 | |
3221 generate_slow_guard(test_assigned, slow_region); | |
3222 | |
3223 Node* init_mem = reset_memory(); | |
3224 // fill in the rest of the null path: | |
3225 result_io ->init_req(_null_path, i_o()); | |
3226 result_mem->init_req(_null_path, init_mem); | |
3227 | |
3228 result_val->init_req(_fast_path, hash_val); | |
3229 result_reg->init_req(_fast_path, control()); | |
3230 result_io ->init_req(_fast_path, i_o()); | |
3231 result_mem->init_req(_fast_path, init_mem); | |
3232 | |
3233 // Generate code for the slow case. We make a call to hashCode(). | |
3234 set_control(_gvn.transform(slow_region)); | |
3235 if (!stopped()) { | |
3236 // No need for PreserveJVMState, because we're using up the present state. | |
3237 set_all_memory(init_mem); | |
3238 vmIntrinsics::ID hashCode_id = vmIntrinsics::_hashCode; | |
3239 if (is_static) hashCode_id = vmIntrinsics::_identityHashCode; | |
3240 CallJavaNode* slow_call = generate_method_call(hashCode_id, is_virtual, is_static); | |
3241 Node* slow_result = set_results_for_java_call(slow_call); | |
3242 // this->control() comes from set_results_for_java_call | |
3243 result_reg->init_req(_slow_path, control()); | |
3244 result_val->init_req(_slow_path, slow_result); | |
3245 result_io ->set_req(_slow_path, i_o()); | |
3246 result_mem ->set_req(_slow_path, reset_memory()); | |
3247 } | |
3248 | |
3249 // Return the combined state. | |
3250 set_i_o( _gvn.transform(result_io) ); | |
3251 set_all_memory( _gvn.transform(result_mem) ); | |
3252 push_result(result_reg, result_val); | |
3253 | |
3254 return true; | |
3255 } | |
3256 | |
3257 //---------------------------inline_native_getClass---------------------------- | |
3258 // Build special case code for calls to hashCode on an object. | |
3259 bool LibraryCallKit::inline_native_getClass() { | |
3260 Node* obj = null_check_receiver(callee()); | |
3261 if (stopped()) return true; | |
3262 push( load_mirror_from_klass(load_object_klass(obj)) ); | |
3263 return true; | |
3264 } | |
3265 | |
3266 //-----------------inline_native_Reflection_getCallerClass--------------------- | |
3267 // In the presence of deep enough inlining, getCallerClass() becomes a no-op. | |
3268 // | |
3269 // NOTE that this code must perform the same logic as | |
3270 // vframeStream::security_get_caller_frame in that it must skip | |
3271 // Method.invoke() and auxiliary frames. | |
3272 | |
3273 | |
3274 | |
3275 | |
3276 bool LibraryCallKit::inline_native_Reflection_getCallerClass() { | |
3277 ciMethod* method = callee(); | |
3278 | |
3279 #ifndef PRODUCT | |
3280 if ((PrintIntrinsics || PrintInlining || PrintOptoInlining) && Verbose) { | |
3281 tty->print_cr("Attempting to inline sun.reflect.Reflection.getCallerClass"); | |
3282 } | |
3283 #endif | |
3284 | |
3285 debug_only(int saved_sp = _sp); | |
3286 | |
3287 // Argument words: (int depth) | |
3288 int nargs = 1; | |
3289 | |
3290 _sp += nargs; | |
3291 Node* caller_depth_node = pop(); | |
3292 | |
3293 assert(saved_sp == _sp, "must have correct argument count"); | |
3294 | |
3295 // The depth value must be a constant in order for the runtime call | |
3296 // to be eliminated. | |
3297 const TypeInt* caller_depth_type = _gvn.type(caller_depth_node)->isa_int(); | |
3298 if (caller_depth_type == NULL || !caller_depth_type->is_con()) { | |
3299 #ifndef PRODUCT | |
3300 if ((PrintIntrinsics || PrintInlining || PrintOptoInlining) && Verbose) { | |
3301 tty->print_cr(" Bailing out because caller depth was not a constant"); | |
3302 } | |
3303 #endif | |
3304 return false; | |
3305 } | |
3306 // Note that the JVM state at this point does not include the | |
3307 // getCallerClass() frame which we are trying to inline. The | |
3308 // semantics of getCallerClass(), however, are that the "first" | |
3309 // frame is the getCallerClass() frame, so we subtract one from the | |
3310 // requested depth before continuing. We don't inline requests of | |
3311 // getCallerClass(0). | |
3312 int caller_depth = caller_depth_type->get_con() - 1; | |
3313 if (caller_depth < 0) { | |
3314 #ifndef PRODUCT | |
3315 if ((PrintIntrinsics || PrintInlining || PrintOptoInlining) && Verbose) { | |
3316 tty->print_cr(" Bailing out because caller depth was %d", caller_depth); | |
3317 } | |
3318 #endif | |
3319 return false; | |
3320 } | |
3321 | |
3322 if (!jvms()->has_method()) { | |
3323 #ifndef PRODUCT | |
3324 if ((PrintIntrinsics || PrintInlining || PrintOptoInlining) && Verbose) { | |
3325 tty->print_cr(" Bailing out because intrinsic was inlined at top level"); | |
3326 } | |
3327 #endif | |
3328 return false; | |
3329 } | |
3330 int _depth = jvms()->depth(); // cache call chain depth | |
3331 | |
3332 // Walk back up the JVM state to find the caller at the required | |
3333 // depth. NOTE that this code must perform the same logic as | |
3334 // vframeStream::security_get_caller_frame in that it must skip | |
3335 // Method.invoke() and auxiliary frames. Note also that depth is | |
3336 // 1-based (1 is the bottom of the inlining). | |
3337 int inlining_depth = _depth; | |
3338 JVMState* caller_jvms = NULL; | |
3339 | |
3340 if (inlining_depth > 0) { | |
3341 caller_jvms = jvms(); | |
3342 assert(caller_jvms = jvms()->of_depth(inlining_depth), "inlining_depth == our depth"); | |
3343 do { | |
3344 // The following if-tests should be performed in this order | |
3345 if (is_method_invoke_or_aux_frame(caller_jvms)) { | |
3346 // Skip a Method.invoke() or auxiliary frame | |
3347 } else if (caller_depth > 0) { | |
3348 // Skip real frame | |
3349 --caller_depth; | |
3350 } else { | |
3351 // We're done: reached desired caller after skipping. | |
3352 break; | |
3353 } | |
3354 caller_jvms = caller_jvms->caller(); | |
3355 --inlining_depth; | |
3356 } while (inlining_depth > 0); | |
3357 } | |
3358 | |
3359 if (inlining_depth == 0) { | |
3360 #ifndef PRODUCT | |
3361 if ((PrintIntrinsics || PrintInlining || PrintOptoInlining) && Verbose) { | |
3362 tty->print_cr(" Bailing out because caller depth (%d) exceeded inlining depth (%d)", caller_depth_type->get_con(), _depth); | |
3363 tty->print_cr(" JVM state at this point:"); | |
3364 for (int i = _depth; i >= 1; i--) { | |
3365 tty->print_cr(" %d) %s", i, jvms()->of_depth(i)->method()->name()->as_utf8()); | |
3366 } | |
3367 } | |
3368 #endif | |
3369 return false; // Reached end of inlining | |
3370 } | |
3371 | |
3372 // Acquire method holder as java.lang.Class | |
3373 ciInstanceKlass* caller_klass = caller_jvms->method()->holder(); | |
3374 ciInstance* caller_mirror = caller_klass->java_mirror(); | |
3375 // Push this as a constant | |
3376 push(makecon(TypeInstPtr::make(caller_mirror))); | |
3377 #ifndef PRODUCT | |
3378 if ((PrintIntrinsics || PrintInlining || PrintOptoInlining) && Verbose) { | |
3379 tty->print_cr(" Succeeded: caller = %s.%s, caller depth = %d, depth = %d", caller_klass->name()->as_utf8(), caller_jvms->method()->name()->as_utf8(), caller_depth_type->get_con(), _depth); | |
3380 tty->print_cr(" JVM state at this point:"); | |
3381 for (int i = _depth; i >= 1; i--) { | |
3382 tty->print_cr(" %d) %s", i, jvms()->of_depth(i)->method()->name()->as_utf8()); | |
3383 } | |
3384 } | |
3385 #endif | |
3386 return true; | |
3387 } | |
3388 | |
3389 // Helper routine for above | |
3390 bool LibraryCallKit::is_method_invoke_or_aux_frame(JVMState* jvms) { | |
3391 // Is this the Method.invoke method itself? | |
3392 if (jvms->method()->intrinsic_id() == vmIntrinsics::_invoke) | |
3393 return true; | |
3394 | |
3395 // Is this a helper, defined somewhere underneath MethodAccessorImpl. | |
3396 ciKlass* k = jvms->method()->holder(); | |
3397 if (k->is_instance_klass()) { | |
3398 ciInstanceKlass* ik = k->as_instance_klass(); | |
3399 for (; ik != NULL; ik = ik->super()) { | |
3400 if (ik->name() == ciSymbol::sun_reflect_MethodAccessorImpl() && | |
3401 ik == env()->find_system_klass(ik->name())) { | |
3402 return true; | |
3403 } | |
3404 } | |
3405 } | |
3406 | |
3407 return false; | |
3408 } | |
3409 | |
3410 static int value_field_offset = -1; // offset of the "value" field of AtomicLongCSImpl. This is needed by | |
3411 // inline_native_AtomicLong_attemptUpdate() but it has no way of | |
3412 // computing it since there is no lookup field by name function in the | |
3413 // CI interface. This is computed and set by inline_native_AtomicLong_get(). | |
3414 // Using a static variable here is safe even if we have multiple compilation | |
3415 // threads because the offset is constant. At worst the same offset will be | |
3416 // computed and stored multiple | |
3417 | |
3418 bool LibraryCallKit::inline_native_AtomicLong_get() { | |
3419 // Restore the stack and pop off the argument | |
3420 _sp+=1; | |
3421 Node *obj = pop(); | |
3422 | |
3423 // get the offset of the "value" field. Since the CI interfaces | |
3424 // does not provide a way to look up a field by name, we scan the bytecodes | |
3425 // to get the field index. We expect the first 2 instructions of the method | |
3426 // to be: | |
3427 // 0 aload_0 | |
3428 // 1 getfield "value" | |
3429 ciMethod* method = callee(); | |
3430 if (value_field_offset == -1) | |
3431 { | |
3432 ciField* value_field; | |
3433 ciBytecodeStream iter(method); | |
3434 Bytecodes::Code bc = iter.next(); | |
3435 | |
3436 if ((bc != Bytecodes::_aload_0) && | |
3437 ((bc != Bytecodes::_aload) || (iter.get_index() != 0))) | |
3438 return false; | |
3439 bc = iter.next(); | |
3440 if (bc != Bytecodes::_getfield) | |
3441 return false; | |
3442 bool ignore; | |
3443 value_field = iter.get_field(ignore); | |
3444 value_field_offset = value_field->offset_in_bytes(); | |
3445 } | |
3446 | |
3447 // Null check without removing any arguments. | |
3448 _sp++; | |
3449 obj = do_null_check(obj, T_OBJECT); | |
3450 _sp--; | |
3451 // Check for locking null object | |
3452 if (stopped()) return true; | |
3453 | |
3454 Node *adr = basic_plus_adr(obj, obj, value_field_offset); | |
3455 const TypePtr *adr_type = _gvn.type(adr)->is_ptr(); | |
3456 int alias_idx = C->get_alias_index(adr_type); | |
3457 | |
3458 Node *result = _gvn.transform(new (C, 3) LoadLLockedNode(control(), memory(alias_idx), adr)); | |
3459 | |
3460 push_pair(result); | |
3461 | |
3462 return true; | |
3463 } | |
3464 | |
3465 bool LibraryCallKit::inline_native_AtomicLong_attemptUpdate() { | |
3466 // Restore the stack and pop off the arguments | |
3467 _sp+=5; | |
3468 Node *newVal = pop_pair(); | |
3469 Node *oldVal = pop_pair(); | |
3470 Node *obj = pop(); | |
3471 | |
3472 // we need the offset of the "value" field which was computed when | |
3473 // inlining the get() method. Give up if we don't have it. | |
3474 if (value_field_offset == -1) | |
3475 return false; | |
3476 | |
3477 // Null check without removing any arguments. | |
3478 _sp+=5; | |
3479 obj = do_null_check(obj, T_OBJECT); | |
3480 _sp-=5; | |
3481 // Check for locking null object | |
3482 if (stopped()) return true; | |
3483 | |
3484 Node *adr = basic_plus_adr(obj, obj, value_field_offset); | |
3485 const TypePtr *adr_type = _gvn.type(adr)->is_ptr(); | |
3486 int alias_idx = C->get_alias_index(adr_type); | |
3487 | |
3488 Node *result = _gvn.transform(new (C, 5) StoreLConditionalNode(control(), memory(alias_idx), adr, newVal, oldVal)); | |
3489 Node *store_proj = _gvn.transform( new (C, 1) SCMemProjNode(result)); | |
3490 set_memory(store_proj, alias_idx); | |
3491 | |
3492 push(result); | |
3493 return true; | |
3494 } | |
3495 | |
3496 bool LibraryCallKit::inline_fp_conversions(vmIntrinsics::ID id) { | |
3497 // restore the arguments | |
3498 _sp += arg_size(); | |
3499 | |
3500 switch (id) { | |
3501 case vmIntrinsics::_floatToRawIntBits: | |
3502 push(_gvn.transform( new (C, 2) MoveF2INode(pop()))); | |
3503 break; | |
3504 | |
3505 case vmIntrinsics::_intBitsToFloat: | |
3506 push(_gvn.transform( new (C, 2) MoveI2FNode(pop()))); | |
3507 break; | |
3508 | |
3509 case vmIntrinsics::_doubleToRawLongBits: | |
3510 push_pair(_gvn.transform( new (C, 2) MoveD2LNode(pop_pair()))); | |
3511 break; | |
3512 | |
3513 case vmIntrinsics::_longBitsToDouble: | |
3514 push_pair(_gvn.transform( new (C, 2) MoveL2DNode(pop_pair()))); | |
3515 break; | |
3516 | |
3517 case vmIntrinsics::_doubleToLongBits: { | |
3518 Node* value = pop_pair(); | |
3519 | |
3520 // two paths (plus control) merge in a wood | |
3521 RegionNode *r = new (C, 3) RegionNode(3); | |
3522 Node *phi = new (C, 3) PhiNode(r, TypeLong::LONG); | |
3523 | |
3524 Node *cmpisnan = _gvn.transform( new (C, 3) CmpDNode(value, value)); | |
3525 // Build the boolean node | |
3526 Node *bolisnan = _gvn.transform( new (C, 2) BoolNode( cmpisnan, BoolTest::ne ) ); | |
3527 | |
3528 // Branch either way. | |
3529 // NaN case is less traveled, which makes all the difference. | |
3530 IfNode *ifisnan = create_and_xform_if(control(), bolisnan, PROB_STATIC_FREQUENT, COUNT_UNKNOWN); | |
3531 Node *opt_isnan = _gvn.transform(ifisnan); | |
3532 assert( opt_isnan->is_If(), "Expect an IfNode"); | |
3533 IfNode *opt_ifisnan = (IfNode*)opt_isnan; | |
3534 Node *iftrue = _gvn.transform( new (C, 1) IfTrueNode(opt_ifisnan) ); | |
3535 | |
3536 set_control(iftrue); | |
3537 | |
3538 static const jlong nan_bits = CONST64(0x7ff8000000000000); | |
3539 Node *slow_result = longcon(nan_bits); // return NaN | |
3540 phi->init_req(1, _gvn.transform( slow_result )); | |
3541 r->init_req(1, iftrue); | |
3542 | |
3543 // Else fall through | |
3544 Node *iffalse = _gvn.transform( new (C, 1) IfFalseNode(opt_ifisnan) ); | |
3545 set_control(iffalse); | |
3546 | |
3547 phi->init_req(2, _gvn.transform( new (C, 2) MoveD2LNode(value))); | |
3548 r->init_req(2, iffalse); | |
3549 | |
3550 // Post merge | |
3551 set_control(_gvn.transform(r)); | |
3552 record_for_igvn(r); | |
3553 | |
3554 Node* result = _gvn.transform(phi); | |
3555 assert(result->bottom_type()->isa_long(), "must be"); | |
3556 push_pair(result); | |
3557 | |
3558 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
3559 | |
3560 break; | |
3561 } | |
3562 | |
3563 case vmIntrinsics::_floatToIntBits: { | |
3564 Node* value = pop(); | |
3565 | |
3566 // two paths (plus control) merge in a wood | |
3567 RegionNode *r = new (C, 3) RegionNode(3); | |
3568 Node *phi = new (C, 3) PhiNode(r, TypeInt::INT); | |
3569 | |
3570 Node *cmpisnan = _gvn.transform( new (C, 3) CmpFNode(value, value)); | |
3571 // Build the boolean node | |
3572 Node *bolisnan = _gvn.transform( new (C, 2) BoolNode( cmpisnan, BoolTest::ne ) ); | |
3573 | |
3574 // Branch either way. | |
3575 // NaN case is less traveled, which makes all the difference. | |
3576 IfNode *ifisnan = create_and_xform_if(control(), bolisnan, PROB_STATIC_FREQUENT, COUNT_UNKNOWN); | |
3577 Node *opt_isnan = _gvn.transform(ifisnan); | |
3578 assert( opt_isnan->is_If(), "Expect an IfNode"); | |
3579 IfNode *opt_ifisnan = (IfNode*)opt_isnan; | |
3580 Node *iftrue = _gvn.transform( new (C, 1) IfTrueNode(opt_ifisnan) ); | |
3581 | |
3582 set_control(iftrue); | |
3583 | |
3584 static const jint nan_bits = 0x7fc00000; | |
3585 Node *slow_result = makecon(TypeInt::make(nan_bits)); // return NaN | |
3586 phi->init_req(1, _gvn.transform( slow_result )); | |
3587 r->init_req(1, iftrue); | |
3588 | |
3589 // Else fall through | |
3590 Node *iffalse = _gvn.transform( new (C, 1) IfFalseNode(opt_ifisnan) ); | |
3591 set_control(iffalse); | |
3592 | |
3593 phi->init_req(2, _gvn.transform( new (C, 2) MoveF2INode(value))); | |
3594 r->init_req(2, iffalse); | |
3595 | |
3596 // Post merge | |
3597 set_control(_gvn.transform(r)); | |
3598 record_for_igvn(r); | |
3599 | |
3600 Node* result = _gvn.transform(phi); | |
3601 assert(result->bottom_type()->isa_int(), "must be"); | |
3602 push(result); | |
3603 | |
3604 C->set_has_split_ifs(true); // Has chance for split-if optimization | |
3605 | |
3606 break; | |
3607 } | |
3608 | |
3609 default: | |
3610 ShouldNotReachHere(); | |
3611 } | |
3612 | |
3613 return true; | |
3614 } | |
3615 | |
3616 #ifdef _LP64 | |
3617 #define XTOP ,top() /*additional argument*/ | |
3618 #else //_LP64 | |
3619 #define XTOP /*no additional argument*/ | |
3620 #endif //_LP64 | |
3621 | |
3622 //----------------------inline_unsafe_copyMemory------------------------- | |
3623 bool LibraryCallKit::inline_unsafe_copyMemory() { | |
3624 if (callee()->is_static()) return false; // caller must have the capability! | |
3625 int nargs = 1 + 5 + 3; // 5 args: (src: ptr,off, dst: ptr,off, size) | |
3626 assert(signature()->size() == nargs-1, "copy has 5 arguments"); | |
3627 null_check_receiver(callee()); // check then ignore argument(0) | |
3628 if (stopped()) return true; | |
3629 | |
3630 C->set_has_unsafe_access(true); // Mark eventual nmethod as "unsafe". | |
3631 | |
3632 Node* src_ptr = argument(1); | |
3633 Node* src_off = ConvL2X(argument(2)); | |
3634 assert(argument(3)->is_top(), "2nd half of long"); | |
3635 Node* dst_ptr = argument(4); | |
3636 Node* dst_off = ConvL2X(argument(5)); | |
3637 assert(argument(6)->is_top(), "2nd half of long"); | |
3638 Node* size = ConvL2X(argument(7)); | |
3639 assert(argument(8)->is_top(), "2nd half of long"); | |
3640 | |
3641 assert(Unsafe_field_offset_to_byte_offset(11) == 11, | |
3642 "fieldOffset must be byte-scaled"); | |
3643 | |
3644 Node* src = make_unsafe_address(src_ptr, src_off); | |
3645 Node* dst = make_unsafe_address(dst_ptr, dst_off); | |
3646 | |
3647 // Conservatively insert a memory barrier on all memory slices. | |
3648 // Do not let writes of the copy source or destination float below the copy. | |
3649 insert_mem_bar(Op_MemBarCPUOrder); | |
3650 | |
3651 // Call it. Note that the length argument is not scaled. | |
3652 make_runtime_call(RC_LEAF|RC_NO_FP, | |
3653 OptoRuntime::fast_arraycopy_Type(), | |
3654 StubRoutines::unsafe_arraycopy(), | |
3655 "unsafe_arraycopy", | |
3656 TypeRawPtr::BOTTOM, | |
3657 src, dst, size XTOP); | |
3658 | |
3659 // Do not let reads of the copy destination float above the copy. | |
3660 insert_mem_bar(Op_MemBarCPUOrder); | |
3661 | |
3662 return true; | |
3663 } | |
3664 | |
3665 | |
3666 //------------------------inline_native_clone---------------------------- | |
3667 // Here are the simple edge cases: | |
3668 // null receiver => normal trap | |
3669 // virtual and clone was overridden => slow path to out-of-line clone | |
3670 // not cloneable or finalizer => slow path to out-of-line Object.clone | |
3671 // | |
3672 // The general case has two steps, allocation and copying. | |
3673 // Allocation has two cases, and uses GraphKit::new_instance or new_array. | |
3674 // | |
3675 // Copying also has two cases, oop arrays and everything else. | |
3676 // Oop arrays use arrayof_oop_arraycopy (same as System.arraycopy). | |
3677 // Everything else uses the tight inline loop supplied by CopyArrayNode. | |
3678 // | |
3679 // These steps fold up nicely if and when the cloned object's klass | |
3680 // can be sharply typed as an object array, a type array, or an instance. | |
3681 // | |
3682 bool LibraryCallKit::inline_native_clone(bool is_virtual) { | |
3683 int nargs = 1; | |
3684 Node* obj = null_check_receiver(callee()); | |
3685 if (stopped()) return true; | |
3686 Node* obj_klass = load_object_klass(obj); | |
3687 const TypeKlassPtr* tklass = _gvn.type(obj_klass)->isa_klassptr(); | |
3688 const TypeOopPtr* toop = ((tklass != NULL) | |
3689 ? tklass->as_instance_type() | |
3690 : TypeInstPtr::NOTNULL); | |
3691 | |
3692 // Conservatively insert a memory barrier on all memory slices. | |
3693 // Do not let writes into the original float below the clone. | |
3694 insert_mem_bar(Op_MemBarCPUOrder); | |
3695 | |
3696 // paths into result_reg: | |
3697 enum { | |
3698 _slow_path = 1, // out-of-line call to clone method (virtual or not) | |
3699 _objArray_path, // plain allocation, plus arrayof_oop_arraycopy | |
3700 _fast_path, // plain allocation, plus a CopyArray operation | |
3701 PATH_LIMIT | |
3702 }; | |
3703 RegionNode* result_reg = new(C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
3704 PhiNode* result_val = new(C, PATH_LIMIT) PhiNode(result_reg, | |
3705 TypeInstPtr::NOTNULL); | |
3706 PhiNode* result_i_o = new(C, PATH_LIMIT) PhiNode(result_reg, Type::ABIO); | |
3707 PhiNode* result_mem = new(C, PATH_LIMIT) PhiNode(result_reg, Type::MEMORY, | |
3708 TypePtr::BOTTOM); | |
3709 record_for_igvn(result_reg); | |
3710 | |
3711 const TypePtr* raw_adr_type = TypeRawPtr::BOTTOM; | |
3712 int raw_adr_idx = Compile::AliasIdxRaw; | |
3713 const bool raw_mem_only = true; | |
3714 | |
3715 // paths into alloc_reg (on the fast path, just before the CopyArray): | |
3716 enum { _typeArray_alloc = 1, _instance_alloc, ALLOC_LIMIT }; | |
3717 RegionNode* alloc_reg = new(C, ALLOC_LIMIT) RegionNode(ALLOC_LIMIT); | |
3718 PhiNode* alloc_val = new(C, ALLOC_LIMIT) PhiNode(alloc_reg, raw_adr_type); | |
3719 PhiNode* alloc_siz = new(C, ALLOC_LIMIT) PhiNode(alloc_reg, TypeX_X); | |
3720 PhiNode* alloc_i_o = new(C, ALLOC_LIMIT) PhiNode(alloc_reg, Type::ABIO); | |
3721 PhiNode* alloc_mem = new(C, ALLOC_LIMIT) PhiNode(alloc_reg, Type::MEMORY, | |
3722 raw_adr_type); | |
3723 record_for_igvn(alloc_reg); | |
3724 | |
3725 bool card_mark = false; // (see below) | |
3726 | |
3727 Node* array_ctl = generate_array_guard(obj_klass, (RegionNode*)NULL); | |
3728 if (array_ctl != NULL) { | |
3729 // It's an array. | |
3730 PreserveJVMState pjvms(this); | |
3731 set_control(array_ctl); | |
3732 Node* obj_length = load_array_length(obj); | |
3733 Node* obj_size = NULL; | |
3734 _sp += nargs; // set original stack for use by uncommon_trap | |
3735 Node* alloc_obj = new_array(obj_klass, obj_length, | |
3736 raw_mem_only, &obj_size); | |
3737 _sp -= nargs; | |
3738 assert(obj_size != NULL, ""); | |
3739 Node* raw_obj = alloc_obj->in(1); | |
3740 assert(raw_obj->is_Proj() && raw_obj->in(0)->is_Allocate(), ""); | |
3741 if (ReduceBulkZeroing) { | |
3742 AllocateNode* alloc = AllocateNode::Ideal_allocation(alloc_obj, &_gvn); | |
3743 if (alloc != NULL) { | |
3744 // We will be completely responsible for initializing this object. | |
3745 alloc->maybe_set_complete(&_gvn); | |
3746 } | |
3747 } | |
3748 | |
3749 if (!use_ReduceInitialCardMarks()) { | |
3750 // If it is an oop array, it requires very special treatment, | |
3751 // because card marking is required on each card of the array. | |
3752 Node* is_obja = generate_objArray_guard(obj_klass, (RegionNode*)NULL); | |
3753 if (is_obja != NULL) { | |
3754 PreserveJVMState pjvms2(this); | |
3755 set_control(is_obja); | |
3756 // Generate a direct call to the right arraycopy function(s). | |
3757 bool disjoint_bases = true; | |
3758 bool length_never_negative = true; | |
3759 generate_arraycopy(TypeAryPtr::OOPS, T_OBJECT, | |
3760 obj, intcon(0), alloc_obj, intcon(0), | |
3761 obj_length, nargs, | |
3762 disjoint_bases, length_never_negative); | |
3763 result_reg->init_req(_objArray_path, control()); | |
3764 result_val->init_req(_objArray_path, alloc_obj); | |
3765 result_i_o ->set_req(_objArray_path, i_o()); | |
3766 result_mem ->set_req(_objArray_path, reset_memory()); | |
3767 } | |
3768 } | |
3769 // We can dispense with card marks if we know the allocation | |
3770 // comes out of eden (TLAB)... In fact, ReduceInitialCardMarks | |
3771 // causes the non-eden paths to simulate a fresh allocation, | |
3772 // insofar that no further card marks are required to initialize | |
3773 // the object. | |
3774 | |
3775 // Otherwise, there are no card marks to worry about. | |
3776 alloc_val->init_req(_typeArray_alloc, raw_obj); | |
3777 alloc_siz->init_req(_typeArray_alloc, obj_size); | |
3778 alloc_reg->init_req(_typeArray_alloc, control()); | |
3779 alloc_i_o->init_req(_typeArray_alloc, i_o()); | |
3780 alloc_mem->init_req(_typeArray_alloc, memory(raw_adr_type)); | |
3781 } | |
3782 | |
3783 // We only go to the fast case code if we pass a number of guards. | |
3784 // The paths which do not pass are accumulated in the slow_region. | |
3785 RegionNode* slow_region = new (C, 1) RegionNode(1); | |
3786 record_for_igvn(slow_region); | |
3787 if (!stopped()) { | |
3788 // It's an instance. Make the slow-path tests. | |
3789 // If this is a virtual call, we generate a funny guard. We grab | |
3790 // the vtable entry corresponding to clone() from the target object. | |
3791 // If the target method which we are calling happens to be the | |
3792 // Object clone() method, we pass the guard. We do not need this | |
3793 // guard for non-virtual calls; the caller is known to be the native | |
3794 // Object clone(). | |
3795 if (is_virtual) { | |
3796 generate_virtual_guard(obj_klass, slow_region); | |
3797 } | |
3798 | |
3799 // The object must be cloneable and must not have a finalizer. | |
3800 // Both of these conditions may be checked in a single test. | |
3801 // We could optimize the cloneable test further, but we don't care. | |
3802 generate_access_flags_guard(obj_klass, | |
3803 // Test both conditions: | |
3804 JVM_ACC_IS_CLONEABLE | JVM_ACC_HAS_FINALIZER, | |
3805 // Must be cloneable but not finalizer: | |
3806 JVM_ACC_IS_CLONEABLE, | |
3807 slow_region); | |
3808 } | |
3809 | |
3810 if (!stopped()) { | |
3811 // It's an instance, and it passed the slow-path tests. | |
3812 PreserveJVMState pjvms(this); | |
3813 Node* obj_size = NULL; | |
3814 Node* alloc_obj = new_instance(obj_klass, NULL, raw_mem_only, &obj_size); | |
3815 assert(obj_size != NULL, ""); | |
3816 Node* raw_obj = alloc_obj->in(1); | |
3817 assert(raw_obj->is_Proj() && raw_obj->in(0)->is_Allocate(), ""); | |
3818 if (ReduceBulkZeroing) { | |
3819 AllocateNode* alloc = AllocateNode::Ideal_allocation(alloc_obj, &_gvn); | |
3820 if (alloc != NULL && !alloc->maybe_set_complete(&_gvn)) | |
3821 alloc = NULL; | |
3822 } | |
3823 if (!use_ReduceInitialCardMarks()) { | |
3824 // Put in store barrier for any and all oops we are sticking | |
3825 // into this object. (We could avoid this if we could prove | |
3826 // that the object type contains no oop fields at all.) | |
3827 card_mark = true; | |
3828 } | |
3829 alloc_val->init_req(_instance_alloc, raw_obj); | |
3830 alloc_siz->init_req(_instance_alloc, obj_size); | |
3831 alloc_reg->init_req(_instance_alloc, control()); | |
3832 alloc_i_o->init_req(_instance_alloc, i_o()); | |
3833 alloc_mem->init_req(_instance_alloc, memory(raw_adr_type)); | |
3834 } | |
3835 | |
3836 // Generate code for the slow case. We make a call to clone(). | |
3837 set_control(_gvn.transform(slow_region)); | |
3838 if (!stopped()) { | |
3839 PreserveJVMState pjvms(this); | |
3840 CallJavaNode* slow_call = generate_method_call(vmIntrinsics::_clone, is_virtual); | |
3841 Node* slow_result = set_results_for_java_call(slow_call); | |
3842 // this->control() comes from set_results_for_java_call | |
3843 result_reg->init_req(_slow_path, control()); | |
3844 result_val->init_req(_slow_path, slow_result); | |
3845 result_i_o ->set_req(_slow_path, i_o()); | |
3846 result_mem ->set_req(_slow_path, reset_memory()); | |
3847 } | |
3848 | |
3849 // The object is allocated, as an array and/or an instance. Now copy it. | |
3850 set_control( _gvn.transform(alloc_reg) ); | |
3851 set_i_o( _gvn.transform(alloc_i_o) ); | |
3852 set_memory( _gvn.transform(alloc_mem), raw_adr_type ); | |
3853 Node* raw_obj = _gvn.transform(alloc_val); | |
3854 | |
3855 if (!stopped()) { | |
3856 // Copy the fastest available way. | |
3857 // (No need for PreserveJVMState, since we're using it all up now.) | |
163 | 3858 // TODO: generate fields/elements copies for small objects instead. |
0 | 3859 Node* src = obj; |
3860 Node* dest = raw_obj; | |
3861 Node* size = _gvn.transform(alloc_siz); | |
3862 | |
3863 // Exclude the header. | |
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3864 int base_off = instanceOopDesc::base_offset_in_bytes(); |
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3865 if (UseCompressedOops) { |
163 | 3866 assert(base_off % BytesPerLong != 0, "base with compressed oops"); |
3867 // With compressed oops base_offset_in_bytes is 12 which creates | |
3868 // the gap since countx is rounded by 8 bytes below. | |
3869 // Copy klass and the gap. | |
3870 base_off = instanceOopDesc::klass_offset_in_bytes(); | |
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3871 } |
0 | 3872 src = basic_plus_adr(src, base_off); |
3873 dest = basic_plus_adr(dest, base_off); | |
3874 | |
3875 // Compute the length also, if needed: | |
3876 Node* countx = size; | |
3877 countx = _gvn.transform( new (C, 3) SubXNode(countx, MakeConX(base_off)) ); | |
3878 countx = _gvn.transform( new (C, 3) URShiftXNode(countx, intcon(LogBytesPerLong) )); | |
3879 | |
3880 // Select an appropriate instruction to initialize the range. | |
3881 // The CopyArray instruction (if supported) can be optimized | |
3882 // into a discrete set of scalar loads and stores. | |
3883 bool disjoint_bases = true; | |
3884 generate_unchecked_arraycopy(raw_adr_type, T_LONG, disjoint_bases, | |
3885 src, NULL, dest, NULL, countx); | |
3886 | |
3887 // Now that the object is properly initialized, type it as an oop. | |
3888 // Use a secondary InitializeNode memory barrier. | |
3889 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, raw_adr_idx, | |
3890 raw_obj)->as_Initialize(); | |
3891 init->set_complete(&_gvn); // (there is no corresponding AllocateNode) | |
3892 Node* new_obj = new(C, 2) CheckCastPPNode(control(), raw_obj, | |
3893 TypeInstPtr::NOTNULL); | |
3894 new_obj = _gvn.transform(new_obj); | |
3895 | |
3896 // If necessary, emit some card marks afterwards. (Non-arrays only.) | |
3897 if (card_mark) { | |
3898 Node* no_particular_value = NULL; | |
3899 Node* no_particular_field = NULL; | |
3900 post_barrier(control(), | |
3901 memory(raw_adr_type), | |
3902 new_obj, | |
3903 no_particular_field, | |
3904 raw_adr_idx, | |
3905 no_particular_value, | |
3906 T_OBJECT, | |
3907 false); | |
3908 } | |
3909 // Present the results of the slow call. | |
3910 result_reg->init_req(_fast_path, control()); | |
3911 result_val->init_req(_fast_path, new_obj); | |
3912 result_i_o ->set_req(_fast_path, i_o()); | |
3913 result_mem ->set_req(_fast_path, reset_memory()); | |
3914 } | |
3915 | |
3916 // Return the combined state. | |
3917 set_control( _gvn.transform(result_reg) ); | |
3918 set_i_o( _gvn.transform(result_i_o) ); | |
3919 set_all_memory( _gvn.transform(result_mem) ); | |
3920 | |
3921 // Cast the result to a sharper type, since we know what clone does. | |
3922 Node* new_obj = _gvn.transform(result_val); | |
3923 Node* cast = new (C, 2) CheckCastPPNode(control(), new_obj, toop); | |
3924 push(_gvn.transform(cast)); | |
3925 | |
3926 return true; | |
3927 } | |
3928 | |
3929 | |
3930 // constants for computing the copy function | |
3931 enum { | |
3932 COPYFUNC_UNALIGNED = 0, | |
3933 COPYFUNC_ALIGNED = 1, // src, dest aligned to HeapWordSize | |
3934 COPYFUNC_CONJOINT = 0, | |
3935 COPYFUNC_DISJOINT = 2 // src != dest, or transfer can descend | |
3936 }; | |
3937 | |
3938 // Note: The condition "disjoint" applies also for overlapping copies | |
3939 // where an descending copy is permitted (i.e., dest_offset <= src_offset). | |
3940 static address | |
3941 select_arraycopy_function(BasicType t, bool aligned, bool disjoint, const char* &name) { | |
3942 int selector = | |
3943 (aligned ? COPYFUNC_ALIGNED : COPYFUNC_UNALIGNED) + | |
3944 (disjoint ? COPYFUNC_DISJOINT : COPYFUNC_CONJOINT); | |
3945 | |
3946 #define RETURN_STUB(xxx_arraycopy) { \ | |
3947 name = #xxx_arraycopy; \ | |
3948 return StubRoutines::xxx_arraycopy(); } | |
3949 | |
3950 switch (t) { | |
3951 case T_BYTE: | |
3952 case T_BOOLEAN: | |
3953 switch (selector) { | |
3954 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jbyte_arraycopy); | |
3955 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jbyte_arraycopy); | |
3956 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jbyte_disjoint_arraycopy); | |
3957 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jbyte_disjoint_arraycopy); | |
3958 } | |
3959 case T_CHAR: | |
3960 case T_SHORT: | |
3961 switch (selector) { | |
3962 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jshort_arraycopy); | |
3963 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jshort_arraycopy); | |
3964 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jshort_disjoint_arraycopy); | |
3965 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jshort_disjoint_arraycopy); | |
3966 } | |
3967 case T_INT: | |
3968 case T_FLOAT: | |
3969 switch (selector) { | |
3970 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jint_arraycopy); | |
3971 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jint_arraycopy); | |
3972 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jint_disjoint_arraycopy); | |
3973 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jint_disjoint_arraycopy); | |
3974 } | |
3975 case T_DOUBLE: | |
3976 case T_LONG: | |
3977 switch (selector) { | |
3978 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jlong_arraycopy); | |
3979 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jlong_arraycopy); | |
3980 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(jlong_disjoint_arraycopy); | |
3981 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_jlong_disjoint_arraycopy); | |
3982 } | |
3983 case T_ARRAY: | |
3984 case T_OBJECT: | |
3985 switch (selector) { | |
3986 case COPYFUNC_CONJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(oop_arraycopy); | |
3987 case COPYFUNC_CONJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_oop_arraycopy); | |
3988 case COPYFUNC_DISJOINT | COPYFUNC_UNALIGNED: RETURN_STUB(oop_disjoint_arraycopy); | |
3989 case COPYFUNC_DISJOINT | COPYFUNC_ALIGNED: RETURN_STUB(arrayof_oop_disjoint_arraycopy); | |
3990 } | |
3991 default: | |
3992 ShouldNotReachHere(); | |
3993 return NULL; | |
3994 } | |
3995 | |
3996 #undef RETURN_STUB | |
3997 } | |
3998 | |
3999 //------------------------------basictype2arraycopy---------------------------- | |
4000 address LibraryCallKit::basictype2arraycopy(BasicType t, | |
4001 Node* src_offset, | |
4002 Node* dest_offset, | |
4003 bool disjoint_bases, | |
4004 const char* &name) { | |
4005 const TypeInt* src_offset_inttype = gvn().find_int_type(src_offset);; | |
4006 const TypeInt* dest_offset_inttype = gvn().find_int_type(dest_offset);; | |
4007 | |
4008 bool aligned = false; | |
4009 bool disjoint = disjoint_bases; | |
4010 | |
4011 // if the offsets are the same, we can treat the memory regions as | |
4012 // disjoint, because either the memory regions are in different arrays, | |
4013 // or they are identical (which we can treat as disjoint.) We can also | |
4014 // treat a copy with a destination index less that the source index | |
4015 // as disjoint since a low->high copy will work correctly in this case. | |
4016 if (src_offset_inttype != NULL && src_offset_inttype->is_con() && | |
4017 dest_offset_inttype != NULL && dest_offset_inttype->is_con()) { | |
4018 // both indices are constants | |
4019 int s_offs = src_offset_inttype->get_con(); | |
4020 int d_offs = dest_offset_inttype->get_con(); | |
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4021 int element_size = type2aelembytes(t); |
0 | 4022 aligned = ((arrayOopDesc::base_offset_in_bytes(t) + s_offs * element_size) % HeapWordSize == 0) && |
4023 ((arrayOopDesc::base_offset_in_bytes(t) + d_offs * element_size) % HeapWordSize == 0); | |
4024 if (s_offs >= d_offs) disjoint = true; | |
4025 } else if (src_offset == dest_offset && src_offset != NULL) { | |
4026 // This can occur if the offsets are identical non-constants. | |
4027 disjoint = true; | |
4028 } | |
4029 | |
4030 return select_arraycopy_function(t, aligned, disjoint, name); | |
4031 } | |
4032 | |
4033 | |
4034 //------------------------------inline_arraycopy----------------------- | |
4035 bool LibraryCallKit::inline_arraycopy() { | |
4036 // Restore the stack and pop off the arguments. | |
4037 int nargs = 5; // 2 oops, 3 ints, no size_t or long | |
4038 assert(callee()->signature()->size() == nargs, "copy has 5 arguments"); | |
4039 | |
4040 Node *src = argument(0); | |
4041 Node *src_offset = argument(1); | |
4042 Node *dest = argument(2); | |
4043 Node *dest_offset = argument(3); | |
4044 Node *length = argument(4); | |
4045 | |
4046 // Compile time checks. If any of these checks cannot be verified at compile time, | |
4047 // we do not make a fast path for this call. Instead, we let the call remain as it | |
4048 // is. The checks we choose to mandate at compile time are: | |
4049 // | |
4050 // (1) src and dest are arrays. | |
4051 const Type* src_type = src->Value(&_gvn); | |
4052 const Type* dest_type = dest->Value(&_gvn); | |
4053 const TypeAryPtr* top_src = src_type->isa_aryptr(); | |
4054 const TypeAryPtr* top_dest = dest_type->isa_aryptr(); | |
4055 if (top_src == NULL || top_src->klass() == NULL || | |
4056 top_dest == NULL || top_dest->klass() == NULL) { | |
4057 // Conservatively insert a memory barrier on all memory slices. | |
4058 // Do not let writes into the source float below the arraycopy. | |
4059 insert_mem_bar(Op_MemBarCPUOrder); | |
4060 | |
4061 // Call StubRoutines::generic_arraycopy stub. | |
4062 generate_arraycopy(TypeRawPtr::BOTTOM, T_CONFLICT, | |
4063 src, src_offset, dest, dest_offset, length, | |
4064 nargs); | |
4065 | |
4066 // Do not let reads from the destination float above the arraycopy. | |
4067 // Since we cannot type the arrays, we don't know which slices | |
4068 // might be affected. We could restrict this barrier only to those | |
4069 // memory slices which pertain to array elements--but don't bother. | |
4070 if (!InsertMemBarAfterArraycopy) | |
4071 // (If InsertMemBarAfterArraycopy, there is already one in place.) | |
4072 insert_mem_bar(Op_MemBarCPUOrder); | |
4073 return true; | |
4074 } | |
4075 | |
4076 // (2) src and dest arrays must have elements of the same BasicType | |
4077 // Figure out the size and type of the elements we will be copying. | |
4078 BasicType src_elem = top_src->klass()->as_array_klass()->element_type()->basic_type(); | |
4079 BasicType dest_elem = top_dest->klass()->as_array_klass()->element_type()->basic_type(); | |
4080 if (src_elem == T_ARRAY) src_elem = T_OBJECT; | |
4081 if (dest_elem == T_ARRAY) dest_elem = T_OBJECT; | |
4082 | |
4083 if (src_elem != dest_elem || dest_elem == T_VOID) { | |
4084 // The component types are not the same or are not recognized. Punt. | |
4085 // (But, avoid the native method wrapper to JVM_ArrayCopy.) | |
4086 generate_slow_arraycopy(TypePtr::BOTTOM, | |
4087 src, src_offset, dest, dest_offset, length, | |
4088 nargs); | |
4089 return true; | |
4090 } | |
4091 | |
4092 //--------------------------------------------------------------------------- | |
4093 // We will make a fast path for this call to arraycopy. | |
4094 | |
4095 // We have the following tests left to perform: | |
4096 // | |
4097 // (3) src and dest must not be null. | |
4098 // (4) src_offset must not be negative. | |
4099 // (5) dest_offset must not be negative. | |
4100 // (6) length must not be negative. | |
4101 // (7) src_offset + length must not exceed length of src. | |
4102 // (8) dest_offset + length must not exceed length of dest. | |
4103 // (9) each element of an oop array must be assignable | |
4104 | |
4105 RegionNode* slow_region = new (C, 1) RegionNode(1); | |
4106 record_for_igvn(slow_region); | |
4107 | |
4108 // (3) operands must not be null | |
4109 // We currently perform our null checks with the do_null_check routine. | |
4110 // This means that the null exceptions will be reported in the caller | |
4111 // rather than (correctly) reported inside of the native arraycopy call. | |
4112 // This should be corrected, given time. We do our null check with the | |
4113 // stack pointer restored. | |
4114 _sp += nargs; | |
4115 src = do_null_check(src, T_ARRAY); | |
4116 dest = do_null_check(dest, T_ARRAY); | |
4117 _sp -= nargs; | |
4118 | |
4119 // (4) src_offset must not be negative. | |
4120 generate_negative_guard(src_offset, slow_region); | |
4121 | |
4122 // (5) dest_offset must not be negative. | |
4123 generate_negative_guard(dest_offset, slow_region); | |
4124 | |
4125 // (6) length must not be negative (moved to generate_arraycopy()). | |
4126 // generate_negative_guard(length, slow_region); | |
4127 | |
4128 // (7) src_offset + length must not exceed length of src. | |
4129 generate_limit_guard(src_offset, length, | |
4130 load_array_length(src), | |
4131 slow_region); | |
4132 | |
4133 // (8) dest_offset + length must not exceed length of dest. | |
4134 generate_limit_guard(dest_offset, length, | |
4135 load_array_length(dest), | |
4136 slow_region); | |
4137 | |
4138 // (9) each element of an oop array must be assignable | |
4139 // The generate_arraycopy subroutine checks this. | |
4140 | |
4141 // This is where the memory effects are placed: | |
4142 const TypePtr* adr_type = TypeAryPtr::get_array_body_type(dest_elem); | |
4143 generate_arraycopy(adr_type, dest_elem, | |
4144 src, src_offset, dest, dest_offset, length, | |
4145 nargs, false, false, slow_region); | |
4146 | |
4147 return true; | |
4148 } | |
4149 | |
4150 //-----------------------------generate_arraycopy---------------------- | |
4151 // Generate an optimized call to arraycopy. | |
4152 // Caller must guard against non-arrays. | |
4153 // Caller must determine a common array basic-type for both arrays. | |
4154 // Caller must validate offsets against array bounds. | |
4155 // The slow_region has already collected guard failure paths | |
4156 // (such as out of bounds length or non-conformable array types). | |
4157 // The generated code has this shape, in general: | |
4158 // | |
4159 // if (length == 0) return // via zero_path | |
4160 // slowval = -1 | |
4161 // if (types unknown) { | |
4162 // slowval = call generic copy loop | |
4163 // if (slowval == 0) return // via checked_path | |
4164 // } else if (indexes in bounds) { | |
4165 // if ((is object array) && !(array type check)) { | |
4166 // slowval = call checked copy loop | |
4167 // if (slowval == 0) return // via checked_path | |
4168 // } else { | |
4169 // call bulk copy loop | |
4170 // return // via fast_path | |
4171 // } | |
4172 // } | |
4173 // // adjust params for remaining work: | |
4174 // if (slowval != -1) { | |
4175 // n = -1^slowval; src_offset += n; dest_offset += n; length -= n | |
4176 // } | |
4177 // slow_region: | |
4178 // call slow arraycopy(src, src_offset, dest, dest_offset, length) | |
4179 // return // via slow_call_path | |
4180 // | |
4181 // This routine is used from several intrinsics: System.arraycopy, | |
4182 // Object.clone (the array subcase), and Arrays.copyOf[Range]. | |
4183 // | |
4184 void | |
4185 LibraryCallKit::generate_arraycopy(const TypePtr* adr_type, | |
4186 BasicType basic_elem_type, | |
4187 Node* src, Node* src_offset, | |
4188 Node* dest, Node* dest_offset, | |
4189 Node* copy_length, | |
4190 int nargs, | |
4191 bool disjoint_bases, | |
4192 bool length_never_negative, | |
4193 RegionNode* slow_region) { | |
4194 | |
4195 if (slow_region == NULL) { | |
4196 slow_region = new(C,1) RegionNode(1); | |
4197 record_for_igvn(slow_region); | |
4198 } | |
4199 | |
4200 Node* original_dest = dest; | |
4201 AllocateArrayNode* alloc = NULL; // used for zeroing, if needed | |
4202 Node* raw_dest = NULL; // used before zeroing, if needed | |
4203 bool must_clear_dest = false; | |
4204 | |
4205 // See if this is the initialization of a newly-allocated array. | |
4206 // If so, we will take responsibility here for initializing it to zero. | |
4207 // (Note: Because tightly_coupled_allocation performs checks on the | |
4208 // out-edges of the dest, we need to avoid making derived pointers | |
4209 // from it until we have checked its uses.) | |
4210 if (ReduceBulkZeroing | |
4211 && !ZeroTLAB // pointless if already zeroed | |
4212 && basic_elem_type != T_CONFLICT // avoid corner case | |
4213 && !_gvn.eqv_uncast(src, dest) | |
4214 && ((alloc = tightly_coupled_allocation(dest, slow_region)) | |
4215 != NULL) | |
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4216 && _gvn.find_int_con(alloc->in(AllocateNode::ALength), 1) > 0 |
0 | 4217 && alloc->maybe_set_complete(&_gvn)) { |
4218 // "You break it, you buy it." | |
4219 InitializeNode* init = alloc->initialization(); | |
4220 assert(init->is_complete(), "we just did this"); | |
4221 assert(dest->Opcode() == Op_CheckCastPP, "sanity"); | |
4222 assert(dest->in(0)->in(0) == init, "dest pinned"); | |
4223 raw_dest = dest->in(1); // grab the raw pointer! | |
4224 original_dest = dest; | |
4225 dest = raw_dest; | |
4226 adr_type = TypeRawPtr::BOTTOM; // all initializations are into raw memory | |
4227 // Decouple the original InitializeNode, turning it into a simple membar. | |
4228 // We will build a new one at the end of this routine. | |
4229 init->set_req(InitializeNode::RawAddress, top()); | |
4230 // From this point on, every exit path is responsible for | |
4231 // initializing any non-copied parts of the object to zero. | |
4232 must_clear_dest = true; | |
4233 } else { | |
4234 // No zeroing elimination here. | |
4235 alloc = NULL; | |
4236 //original_dest = dest; | |
4237 //must_clear_dest = false; | |
4238 } | |
4239 | |
4240 // Results are placed here: | |
4241 enum { fast_path = 1, // normal void-returning assembly stub | |
4242 checked_path = 2, // special assembly stub with cleanup | |
4243 slow_call_path = 3, // something went wrong; call the VM | |
4244 zero_path = 4, // bypass when length of copy is zero | |
4245 bcopy_path = 5, // copy primitive array by 64-bit blocks | |
4246 PATH_LIMIT = 6 | |
4247 }; | |
4248 RegionNode* result_region = new(C, PATH_LIMIT) RegionNode(PATH_LIMIT); | |
4249 PhiNode* result_i_o = new(C, PATH_LIMIT) PhiNode(result_region, Type::ABIO); | |
4250 PhiNode* result_memory = new(C, PATH_LIMIT) PhiNode(result_region, Type::MEMORY, adr_type); | |
4251 record_for_igvn(result_region); | |
4252 _gvn.set_type_bottom(result_i_o); | |
4253 _gvn.set_type_bottom(result_memory); | |
4254 assert(adr_type != TypePtr::BOTTOM, "must be RawMem or a T[] slice"); | |
4255 | |
4256 // The slow_control path: | |
4257 Node* slow_control; | |
4258 Node* slow_i_o = i_o(); | |
4259 Node* slow_mem = memory(adr_type); | |
4260 debug_only(slow_control = (Node*) badAddress); | |
4261 | |
4262 // Checked control path: | |
4263 Node* checked_control = top(); | |
4264 Node* checked_mem = NULL; | |
4265 Node* checked_i_o = NULL; | |
4266 Node* checked_value = NULL; | |
4267 | |
4268 if (basic_elem_type == T_CONFLICT) { | |
4269 assert(!must_clear_dest, ""); | |
4270 Node* cv = generate_generic_arraycopy(adr_type, | |
4271 src, src_offset, dest, dest_offset, | |
4272 copy_length, nargs); | |
4273 if (cv == NULL) cv = intcon(-1); // failure (no stub available) | |
4274 checked_control = control(); | |
4275 checked_i_o = i_o(); | |
4276 checked_mem = memory(adr_type); | |
4277 checked_value = cv; | |
4278 set_control(top()); // no fast path | |
4279 } | |
4280 | |
4281 Node* not_pos = generate_nonpositive_guard(copy_length, length_never_negative); | |
4282 if (not_pos != NULL) { | |
4283 PreserveJVMState pjvms(this); | |
4284 set_control(not_pos); | |
4285 | |
4286 // (6) length must not be negative. | |
4287 if (!length_never_negative) { | |
4288 generate_negative_guard(copy_length, slow_region); | |
4289 } | |
4290 | |
4291 if (!stopped() && must_clear_dest) { | |
4292 Node* dest_length = alloc->in(AllocateNode::ALength); | |
4293 if (_gvn.eqv_uncast(copy_length, dest_length) | |
4294 || _gvn.find_int_con(dest_length, 1) <= 0) { | |
4295 // There is no zeroing to do. | |
4296 } else { | |
4297 // Clear the whole thing since there are no source elements to copy. | |
4298 generate_clear_array(adr_type, dest, basic_elem_type, | |
4299 intcon(0), NULL, | |
4300 alloc->in(AllocateNode::AllocSize)); | |
4301 } | |
4302 } | |
4303 | |
4304 // Present the results of the fast call. | |
4305 result_region->init_req(zero_path, control()); | |
4306 result_i_o ->init_req(zero_path, i_o()); | |
4307 result_memory->init_req(zero_path, memory(adr_type)); | |
4308 } | |
4309 | |
4310 if (!stopped() && must_clear_dest) { | |
4311 // We have to initialize the *uncopied* part of the array to zero. | |
4312 // The copy destination is the slice dest[off..off+len]. The other slices | |
4313 // are dest_head = dest[0..off] and dest_tail = dest[off+len..dest.length]. | |
4314 Node* dest_size = alloc->in(AllocateNode::AllocSize); | |
4315 Node* dest_length = alloc->in(AllocateNode::ALength); | |
4316 Node* dest_tail = _gvn.transform( new(C,3) AddINode(dest_offset, | |
4317 copy_length) ); | |
4318 | |
4319 // If there is a head section that needs zeroing, do it now. | |
4320 if (find_int_con(dest_offset, -1) != 0) { | |
4321 generate_clear_array(adr_type, dest, basic_elem_type, | |
4322 intcon(0), dest_offset, | |
4323 NULL); | |
4324 } | |
4325 | |
4326 // Next, perform a dynamic check on the tail length. | |
4327 // It is often zero, and we can win big if we prove this. | |
4328 // There are two wins: Avoid generating the ClearArray | |
4329 // with its attendant messy index arithmetic, and upgrade | |
4330 // the copy to a more hardware-friendly word size of 64 bits. | |
4331 Node* tail_ctl = NULL; | |
4332 if (!stopped() && !_gvn.eqv_uncast(dest_tail, dest_length)) { | |
4333 Node* cmp_lt = _gvn.transform( new(C,3) CmpINode(dest_tail, dest_length) ); | |
4334 Node* bol_lt = _gvn.transform( new(C,2) BoolNode(cmp_lt, BoolTest::lt) ); | |
4335 tail_ctl = generate_slow_guard(bol_lt, NULL); | |
4336 assert(tail_ctl != NULL || !stopped(), "must be an outcome"); | |
4337 } | |
4338 | |
4339 // At this point, let's assume there is no tail. | |
4340 if (!stopped() && alloc != NULL && basic_elem_type != T_OBJECT) { | |
4341 // There is no tail. Try an upgrade to a 64-bit copy. | |
4342 bool didit = false; | |
4343 { PreserveJVMState pjvms(this); | |
4344 didit = generate_block_arraycopy(adr_type, basic_elem_type, alloc, | |
4345 src, src_offset, dest, dest_offset, | |
4346 dest_size); | |
4347 if (didit) { | |
4348 // Present the results of the block-copying fast call. | |
4349 result_region->init_req(bcopy_path, control()); | |
4350 result_i_o ->init_req(bcopy_path, i_o()); | |
4351 result_memory->init_req(bcopy_path, memory(adr_type)); | |
4352 } | |
4353 } | |
4354 if (didit) | |
4355 set_control(top()); // no regular fast path | |
4356 } | |
4357 | |
4358 // Clear the tail, if any. | |
4359 if (tail_ctl != NULL) { | |
4360 Node* notail_ctl = stopped() ? NULL : control(); | |
4361 set_control(tail_ctl); | |
4362 if (notail_ctl == NULL) { | |
4363 generate_clear_array(adr_type, dest, basic_elem_type, | |
4364 dest_tail, NULL, | |
4365 dest_size); | |
4366 } else { | |
4367 // Make a local merge. | |
4368 Node* done_ctl = new(C,3) RegionNode(3); | |
4369 Node* done_mem = new(C,3) PhiNode(done_ctl, Type::MEMORY, adr_type); | |
4370 done_ctl->init_req(1, notail_ctl); | |
4371 done_mem->init_req(1, memory(adr_type)); | |
4372 generate_clear_array(adr_type, dest, basic_elem_type, | |
4373 dest_tail, NULL, | |
4374 dest_size); | |
4375 done_ctl->init_req(2, control()); | |
4376 done_mem->init_req(2, memory(adr_type)); | |
4377 set_control( _gvn.transform(done_ctl) ); | |
4378 set_memory( _gvn.transform(done_mem), adr_type ); | |
4379 } | |
4380 } | |
4381 } | |
4382 | |
4383 BasicType copy_type = basic_elem_type; | |
4384 assert(basic_elem_type != T_ARRAY, "caller must fix this"); | |
4385 if (!stopped() && copy_type == T_OBJECT) { | |
4386 // If src and dest have compatible element types, we can copy bits. | |
4387 // Types S[] and D[] are compatible if D is a supertype of S. | |
4388 // | |
4389 // If they are not, we will use checked_oop_disjoint_arraycopy, | |
4390 // which performs a fast optimistic per-oop check, and backs off | |
4391 // further to JVM_ArrayCopy on the first per-oop check that fails. | |
4392 // (Actually, we don't move raw bits only; the GC requires card marks.) | |
4393 | |
4394 // Get the klassOop for both src and dest | |
4395 Node* src_klass = load_object_klass(src); | |
4396 Node* dest_klass = load_object_klass(dest); | |
4397 | |
4398 // Generate the subtype check. | |
4399 // This might fold up statically, or then again it might not. | |
4400 // | |
4401 // Non-static example: Copying List<String>.elements to a new String[]. | |
4402 // The backing store for a List<String> is always an Object[], | |
4403 // but its elements are always type String, if the generic types | |
4404 // are correct at the source level. | |
4405 // | |
4406 // Test S[] against D[], not S against D, because (probably) | |
4407 // the secondary supertype cache is less busy for S[] than S. | |
4408 // This usually only matters when D is an interface. | |
4409 Node* not_subtype_ctrl = gen_subtype_check(src_klass, dest_klass); | |
4410 // Plug failing path into checked_oop_disjoint_arraycopy | |
4411 if (not_subtype_ctrl != top()) { | |
4412 PreserveJVMState pjvms(this); | |
4413 set_control(not_subtype_ctrl); | |
4414 // (At this point we can assume disjoint_bases, since types differ.) | |
4415 int ek_offset = objArrayKlass::element_klass_offset_in_bytes() + sizeof(oopDesc); | |
4416 Node* p1 = basic_plus_adr(dest_klass, ek_offset); | |
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4417 Node* n1 = LoadKlassNode::make(_gvn, immutable_memory(), p1, TypeRawPtr::BOTTOM); |
0 | 4418 Node* dest_elem_klass = _gvn.transform(n1); |
4419 Node* cv = generate_checkcast_arraycopy(adr_type, | |
4420 dest_elem_klass, | |
4421 src, src_offset, dest, dest_offset, | |
4422 copy_length, | |
4423 nargs); | |
4424 if (cv == NULL) cv = intcon(-1); // failure (no stub available) | |
4425 checked_control = control(); | |
4426 checked_i_o = i_o(); | |
4427 checked_mem = memory(adr_type); | |
4428 checked_value = cv; | |
4429 } | |
4430 // At this point we know we do not need type checks on oop stores. | |
4431 | |
4432 // Let's see if we need card marks: | |
4433 if (alloc != NULL && use_ReduceInitialCardMarks()) { | |
4434 // If we do not need card marks, copy using the jint or jlong stub. | |
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diff
changeset
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4435 copy_type = LP64_ONLY(UseCompressedOops ? T_INT : T_LONG) NOT_LP64(T_INT); |
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0
diff
changeset
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4436 assert(type2aelembytes(basic_elem_type) == type2aelembytes(copy_type), |
0 | 4437 "sizes agree"); |
4438 } | |
4439 } | |
4440 | |
4441 if (!stopped()) { | |
4442 // Generate the fast path, if possible. | |
4443 PreserveJVMState pjvms(this); | |
4444 generate_unchecked_arraycopy(adr_type, copy_type, disjoint_bases, | |
4445 src, src_offset, dest, dest_offset, | |
4446 ConvI2X(copy_length)); | |
4447 | |
4448 // Present the results of the fast call. | |
4449 result_region->init_req(fast_path, control()); | |
4450 result_i_o ->init_req(fast_path, i_o()); | |
4451 result_memory->init_req(fast_path, memory(adr_type)); | |
4452 } | |
4453 | |
4454 // Here are all the slow paths up to this point, in one bundle: | |
4455 slow_control = top(); | |
4456 if (slow_region != NULL) | |
4457 slow_control = _gvn.transform(slow_region); | |
4458 debug_only(slow_region = (RegionNode*)badAddress); | |
4459 | |
4460 set_control(checked_control); | |
4461 if (!stopped()) { | |
4462 // Clean up after the checked call. | |
4463 // The returned value is either 0 or -1^K, | |
4464 // where K = number of partially transferred array elements. | |
4465 Node* cmp = _gvn.transform( new(C, 3) CmpINode(checked_value, intcon(0)) ); | |
4466 Node* bol = _gvn.transform( new(C, 2) BoolNode(cmp, BoolTest::eq) ); | |
4467 IfNode* iff = create_and_map_if(control(), bol, PROB_MAX, COUNT_UNKNOWN); | |
4468 | |
4469 // If it is 0, we are done, so transfer to the end. | |
4470 Node* checks_done = _gvn.transform( new(C, 1) IfTrueNode(iff) ); | |
4471 result_region->init_req(checked_path, checks_done); | |
4472 result_i_o ->init_req(checked_path, checked_i_o); | |
4473 result_memory->init_req(checked_path, checked_mem); | |
4474 | |
4475 // If it is not zero, merge into the slow call. | |
4476 set_control( _gvn.transform( new(C, 1) IfFalseNode(iff) )); | |
4477 RegionNode* slow_reg2 = new(C, 3) RegionNode(3); | |
4478 PhiNode* slow_i_o2 = new(C, 3) PhiNode(slow_reg2, Type::ABIO); | |
4479 PhiNode* slow_mem2 = new(C, 3) PhiNode(slow_reg2, Type::MEMORY, adr_type); | |
4480 record_for_igvn(slow_reg2); | |
4481 slow_reg2 ->init_req(1, slow_control); | |
4482 slow_i_o2 ->init_req(1, slow_i_o); | |
4483 slow_mem2 ->init_req(1, slow_mem); | |
4484 slow_reg2 ->init_req(2, control()); | |
4485 slow_i_o2 ->init_req(2, i_o()); | |
4486 slow_mem2 ->init_req(2, memory(adr_type)); | |
4487 | |
4488 slow_control = _gvn.transform(slow_reg2); | |
4489 slow_i_o = _gvn.transform(slow_i_o2); | |
4490 slow_mem = _gvn.transform(slow_mem2); | |
4491 | |
4492 if (alloc != NULL) { | |
4493 // We'll restart from the very beginning, after zeroing the whole thing. | |
4494 // This can cause double writes, but that's OK since dest is brand new. | |
4495 // So we ignore the low 31 bits of the value returned from the stub. | |
4496 } else { | |
4497 // We must continue the copy exactly where it failed, or else | |
4498 // another thread might see the wrong number of writes to dest. | |
4499 Node* checked_offset = _gvn.transform( new(C, 3) XorINode(checked_value, intcon(-1)) ); | |
4500 Node* slow_offset = new(C, 3) PhiNode(slow_reg2, TypeInt::INT); | |
4501 slow_offset->init_req(1, intcon(0)); | |
4502 slow_offset->init_req(2, checked_offset); | |
4503 slow_offset = _gvn.transform(slow_offset); | |
4504 | |
4505 // Adjust the arguments by the conditionally incoming offset. | |
4506 Node* src_off_plus = _gvn.transform( new(C, 3) AddINode(src_offset, slow_offset) ); | |
4507 Node* dest_off_plus = _gvn.transform( new(C, 3) AddINode(dest_offset, slow_offset) ); | |
4508 Node* length_minus = _gvn.transform( new(C, 3) SubINode(copy_length, slow_offset) ); | |
4509 | |
4510 // Tweak the node variables to adjust the code produced below: | |
4511 src_offset = src_off_plus; | |
4512 dest_offset = dest_off_plus; | |
4513 copy_length = length_minus; | |
4514 } | |
4515 } | |
4516 | |
4517 set_control(slow_control); | |
4518 if (!stopped()) { | |
4519 // Generate the slow path, if needed. | |
4520 PreserveJVMState pjvms(this); // replace_in_map may trash the map | |
4521 | |
4522 set_memory(slow_mem, adr_type); | |
4523 set_i_o(slow_i_o); | |
4524 | |
4525 if (must_clear_dest) { | |
4526 generate_clear_array(adr_type, dest, basic_elem_type, | |
4527 intcon(0), NULL, | |
4528 alloc->in(AllocateNode::AllocSize)); | |
4529 } | |
4530 | |
4531 if (dest != original_dest) { | |
4532 // Promote from rawptr to oop, so it looks right in the call's GC map. | |
4533 dest = _gvn.transform( new(C,2) CheckCastPPNode(control(), dest, | |
4534 TypeInstPtr::NOTNULL) ); | |
4535 | |
4536 // Edit the call's debug-info to avoid referring to original_dest. | |
4537 // (The problem with original_dest is that it isn't ready until | |
4538 // after the InitializeNode completes, but this stuff is before.) | |
4539 // Substitute in the locally valid dest_oop. | |
4540 replace_in_map(original_dest, dest); | |
4541 } | |
4542 | |
4543 generate_slow_arraycopy(adr_type, | |
4544 src, src_offset, dest, dest_offset, | |
4545 copy_length, nargs); | |
4546 | |
4547 result_region->init_req(slow_call_path, control()); | |
4548 result_i_o ->init_req(slow_call_path, i_o()); | |
4549 result_memory->init_req(slow_call_path, memory(adr_type)); | |
4550 } | |
4551 | |
4552 // Remove unused edges. | |
4553 for (uint i = 1; i < result_region->req(); i++) { | |
4554 if (result_region->in(i) == NULL) | |
4555 result_region->init_req(i, top()); | |
4556 } | |
4557 | |
4558 // Finished; return the combined state. | |
4559 set_control( _gvn.transform(result_region) ); | |
4560 set_i_o( _gvn.transform(result_i_o) ); | |
4561 set_memory( _gvn.transform(result_memory), adr_type ); | |
4562 | |
4563 if (dest != original_dest) { | |
4564 // Pin the "finished" array node after the arraycopy/zeroing operations. | |
4565 // Use a secondary InitializeNode memory barrier. | |
4566 InitializeNode* init = insert_mem_bar_volatile(Op_Initialize, | |
4567 Compile::AliasIdxRaw, | |
4568 raw_dest)->as_Initialize(); | |
4569 init->set_complete(&_gvn); // (there is no corresponding AllocateNode) | |
4570 _gvn.hash_delete(original_dest); | |
4571 original_dest->set_req(0, control()); | |
4572 _gvn.hash_find_insert(original_dest); // put back into GVN table | |
4573 } | |
4574 | |
4575 // The memory edges above are precise in order to model effects around | |
4576 // array copyies accurately to allow value numbering of field loads around | |
4577 // arraycopy. Such field loads, both before and after, are common in Java | |
4578 // collections and similar classes involving header/array data structures. | |
4579 // | |
4580 // But with low number of register or when some registers are used or killed | |
4581 // by arraycopy calls it causes registers spilling on stack. See 6544710. | |
4582 // The next memory barrier is added to avoid it. If the arraycopy can be | |
4583 // optimized away (which it can, sometimes) then we can manually remove | |
4584 // the membar also. | |
4585 if (InsertMemBarAfterArraycopy) | |
4586 insert_mem_bar(Op_MemBarCPUOrder); | |
4587 } | |
4588 | |
4589 | |
4590 // Helper function which determines if an arraycopy immediately follows | |
4591 // an allocation, with no intervening tests or other escapes for the object. | |
4592 AllocateArrayNode* | |
4593 LibraryCallKit::tightly_coupled_allocation(Node* ptr, | |
4594 RegionNode* slow_region) { | |
4595 if (stopped()) return NULL; // no fast path | |
4596 if (C->AliasLevel() == 0) return NULL; // no MergeMems around | |
4597 | |
4598 AllocateArrayNode* alloc = AllocateArrayNode::Ideal_array_allocation(ptr, &_gvn); | |
4599 if (alloc == NULL) return NULL; | |
4600 | |
4601 Node* rawmem = memory(Compile::AliasIdxRaw); | |
4602 // Is the allocation's memory state untouched? | |
4603 if (!(rawmem->is_Proj() && rawmem->in(0)->is_Initialize())) { | |
4604 // Bail out if there have been raw-memory effects since the allocation. | |
4605 // (Example: There might have been a call or safepoint.) | |
4606 return NULL; | |
4607 } | |
4608 rawmem = rawmem->in(0)->as_Initialize()->memory(Compile::AliasIdxRaw); | |
4609 if (!(rawmem->is_Proj() && rawmem->in(0) == alloc)) { | |
4610 return NULL; | |
4611 } | |
4612 | |
4613 // There must be no unexpected observers of this allocation. | |
4614 for (DUIterator_Fast imax, i = ptr->fast_outs(imax); i < imax; i++) { | |
4615 Node* obs = ptr->fast_out(i); | |
4616 if (obs != this->map()) { | |
4617 return NULL; | |
4618 } | |
4619 } | |
4620 | |
4621 // This arraycopy must unconditionally follow the allocation of the ptr. | |
4622 Node* alloc_ctl = ptr->in(0); | |
4623 assert(just_allocated_object(alloc_ctl) == ptr, "most recent allo"); | |
4624 | |
4625 Node* ctl = control(); | |
4626 while (ctl != alloc_ctl) { | |
4627 // There may be guards which feed into the slow_region. | |
4628 // Any other control flow means that we might not get a chance | |
4629 // to finish initializing the allocated object. | |
4630 if ((ctl->is_IfFalse() || ctl->is_IfTrue()) && ctl->in(0)->is_If()) { | |
4631 IfNode* iff = ctl->in(0)->as_If(); | |
4632 Node* not_ctl = iff->proj_out(1 - ctl->as_Proj()->_con); | |
4633 assert(not_ctl != NULL && not_ctl != ctl, "found alternate"); | |
4634 if (slow_region != NULL && slow_region->find_edge(not_ctl) >= 1) { | |
4635 ctl = iff->in(0); // This test feeds the known slow_region. | |
4636 continue; | |
4637 } | |
4638 // One more try: Various low-level checks bottom out in | |
4639 // uncommon traps. If the debug-info of the trap omits | |
4640 // any reference to the allocation, as we've already | |
4641 // observed, then there can be no objection to the trap. | |
4642 bool found_trap = false; | |
4643 for (DUIterator_Fast jmax, j = not_ctl->fast_outs(jmax); j < jmax; j++) { | |
4644 Node* obs = not_ctl->fast_out(j); | |
4645 if (obs->in(0) == not_ctl && obs->is_Call() && | |
4646 (obs->as_Call()->entry_point() == | |
4647 SharedRuntime::uncommon_trap_blob()->instructions_begin())) { | |
4648 found_trap = true; break; | |
4649 } | |
4650 } | |
4651 if (found_trap) { | |
4652 ctl = iff->in(0); // This test feeds a harmless uncommon trap. | |
4653 continue; | |
4654 } | |
4655 } | |
4656 return NULL; | |
4657 } | |
4658 | |
4659 // If we get this far, we have an allocation which immediately | |
4660 // precedes the arraycopy, and we can take over zeroing the new object. | |
4661 // The arraycopy will finish the initialization, and provide | |
4662 // a new control state to which we will anchor the destination pointer. | |
4663 | |
4664 return alloc; | |
4665 } | |
4666 | |
4667 // Helper for initialization of arrays, creating a ClearArray. | |
4668 // It writes zero bits in [start..end), within the body of an array object. | |
4669 // The memory effects are all chained onto the 'adr_type' alias category. | |
4670 // | |
4671 // Since the object is otherwise uninitialized, we are free | |
4672 // to put a little "slop" around the edges of the cleared area, | |
4673 // as long as it does not go back into the array's header, | |
4674 // or beyond the array end within the heap. | |
4675 // | |
4676 // The lower edge can be rounded down to the nearest jint and the | |
4677 // upper edge can be rounded up to the nearest MinObjAlignmentInBytes. | |
4678 // | |
4679 // Arguments: | |
4680 // adr_type memory slice where writes are generated | |
4681 // dest oop of the destination array | |
4682 // basic_elem_type element type of the destination | |
4683 // slice_idx array index of first element to store | |
4684 // slice_len number of elements to store (or NULL) | |
4685 // dest_size total size in bytes of the array object | |
4686 // | |
4687 // Exactly one of slice_len or dest_size must be non-NULL. | |
4688 // If dest_size is non-NULL, zeroing extends to the end of the object. | |
4689 // If slice_len is non-NULL, the slice_idx value must be a constant. | |
4690 void | |
4691 LibraryCallKit::generate_clear_array(const TypePtr* adr_type, | |
4692 Node* dest, | |
4693 BasicType basic_elem_type, | |
4694 Node* slice_idx, | |
4695 Node* slice_len, | |
4696 Node* dest_size) { | |
4697 // one or the other but not both of slice_len and dest_size: | |
4698 assert((slice_len != NULL? 1: 0) + (dest_size != NULL? 1: 0) == 1, ""); | |
4699 if (slice_len == NULL) slice_len = top(); | |
4700 if (dest_size == NULL) dest_size = top(); | |
4701 | |
4702 // operate on this memory slice: | |
4703 Node* mem = memory(adr_type); // memory slice to operate on | |
4704 | |
4705 // scaling and rounding of indexes: | |
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4706 int scale = exact_log2(type2aelembytes(basic_elem_type)); |
0 | 4707 int abase = arrayOopDesc::base_offset_in_bytes(basic_elem_type); |
4708 int clear_low = (-1 << scale) & (BytesPerInt - 1); | |
4709 int bump_bit = (-1 << scale) & BytesPerInt; | |
4710 | |
4711 // determine constant starts and ends | |
4712 const intptr_t BIG_NEG = -128; | |
4713 assert(BIG_NEG + 2*abase < 0, "neg enough"); | |
4714 intptr_t slice_idx_con = (intptr_t) find_int_con(slice_idx, BIG_NEG); | |
4715 intptr_t slice_len_con = (intptr_t) find_int_con(slice_len, BIG_NEG); | |
4716 if (slice_len_con == 0) { | |
4717 return; // nothing to do here | |
4718 } | |
4719 intptr_t start_con = (abase + (slice_idx_con << scale)) & ~clear_low; | |
4720 intptr_t end_con = find_intptr_t_con(dest_size, -1); | |
4721 if (slice_idx_con >= 0 && slice_len_con >= 0) { | |
4722 assert(end_con < 0, "not two cons"); | |
4723 end_con = round_to(abase + ((slice_idx_con + slice_len_con) << scale), | |
4724 BytesPerLong); | |
4725 } | |
4726 | |
4727 if (start_con >= 0 && end_con >= 0) { | |
4728 // Constant start and end. Simple. | |
4729 mem = ClearArrayNode::clear_memory(control(), mem, dest, | |
4730 start_con, end_con, &_gvn); | |
4731 } else if (start_con >= 0 && dest_size != top()) { | |
4732 // Constant start, pre-rounded end after the tail of the array. | |
4733 Node* end = dest_size; | |
4734 mem = ClearArrayNode::clear_memory(control(), mem, dest, | |
4735 start_con, end, &_gvn); | |
4736 } else if (start_con >= 0 && slice_len != top()) { | |
4737 // Constant start, non-constant end. End needs rounding up. | |
4738 // End offset = round_up(abase + ((slice_idx_con + slice_len) << scale), 8) | |
4739 intptr_t end_base = abase + (slice_idx_con << scale); | |
4740 int end_round = (-1 << scale) & (BytesPerLong - 1); | |
4741 Node* end = ConvI2X(slice_len); | |
4742 if (scale != 0) | |
4743 end = _gvn.transform( new(C,3) LShiftXNode(end, intcon(scale) )); | |
4744 end_base += end_round; | |
4745 end = _gvn.transform( new(C,3) AddXNode(end, MakeConX(end_base)) ); | |
4746 end = _gvn.transform( new(C,3) AndXNode(end, MakeConX(~end_round)) ); | |
4747 mem = ClearArrayNode::clear_memory(control(), mem, dest, | |
4748 start_con, end, &_gvn); | |
4749 } else if (start_con < 0 && dest_size != top()) { | |
4750 // Non-constant start, pre-rounded end after the tail of the array. | |
4751 // This is almost certainly a "round-to-end" operation. | |
4752 Node* start = slice_idx; | |
4753 start = ConvI2X(start); | |
4754 if (scale != 0) | |
4755 start = _gvn.transform( new(C,3) LShiftXNode( start, intcon(scale) )); | |
4756 start = _gvn.transform( new(C,3) AddXNode(start, MakeConX(abase)) ); | |
4757 if ((bump_bit | clear_low) != 0) { | |
4758 int to_clear = (bump_bit | clear_low); | |
4759 // Align up mod 8, then store a jint zero unconditionally | |
4760 // just before the mod-8 boundary. | |
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4761 if (((abase + bump_bit) & ~to_clear) - bump_bit |
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4762 < arrayOopDesc::length_offset_in_bytes() + BytesPerInt) { |
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4763 bump_bit = 0; |
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4764 assert((abase & to_clear) == 0, "array base must be long-aligned"); |
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4765 } else { |
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4766 // Bump 'start' up to (or past) the next jint boundary: |
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4767 start = _gvn.transform( new(C,3) AddXNode(start, MakeConX(bump_bit)) ); |
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4768 assert((abase & clear_low) == 0, "array base must be int-aligned"); |
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4769 } |
0 | 4770 // Round bumped 'start' down to jlong boundary in body of array. |
4771 start = _gvn.transform( new(C,3) AndXNode(start, MakeConX(~to_clear)) ); | |
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4772 if (bump_bit != 0) { |
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4773 // Store a zero to the immediately preceding jint: |
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4774 Node* x1 = _gvn.transform( new(C,3) AddXNode(start, MakeConX(-bump_bit)) ); |
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4775 Node* p1 = basic_plus_adr(dest, x1); |
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4776 mem = StoreNode::make(_gvn, control(), mem, p1, adr_type, intcon(0), T_INT); |
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4777 mem = _gvn.transform(mem); |
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4778 } |
0 | 4779 } |
4780 Node* end = dest_size; // pre-rounded | |
4781 mem = ClearArrayNode::clear_memory(control(), mem, dest, | |
4782 start, end, &_gvn); | |
4783 } else { | |
4784 // Non-constant start, unrounded non-constant end. | |
4785 // (Nobody zeroes a random midsection of an array using this routine.) | |
4786 ShouldNotReachHere(); // fix caller | |
4787 } | |
4788 | |
4789 // Done. | |
4790 set_memory(mem, adr_type); | |
4791 } | |
4792 | |
4793 | |
4794 bool | |
4795 LibraryCallKit::generate_block_arraycopy(const TypePtr* adr_type, | |
4796 BasicType basic_elem_type, | |
4797 AllocateNode* alloc, | |
4798 Node* src, Node* src_offset, | |
4799 Node* dest, Node* dest_offset, | |
4800 Node* dest_size) { | |
4801 // See if there is an advantage from block transfer. | |
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4802 int scale = exact_log2(type2aelembytes(basic_elem_type)); |
0 | 4803 if (scale >= LogBytesPerLong) |
4804 return false; // it is already a block transfer | |
4805 | |
4806 // Look at the alignment of the starting offsets. | |
4807 int abase = arrayOopDesc::base_offset_in_bytes(basic_elem_type); | |
4808 const intptr_t BIG_NEG = -128; | |
4809 assert(BIG_NEG + 2*abase < 0, "neg enough"); | |
4810 | |
4811 intptr_t src_off = abase + ((intptr_t) find_int_con(src_offset, -1) << scale); | |
4812 intptr_t dest_off = abase + ((intptr_t) find_int_con(dest_offset, -1) << scale); | |
4813 if (src_off < 0 || dest_off < 0) | |
4814 // At present, we can only understand constants. | |
4815 return false; | |
4816 | |
4817 if (((src_off | dest_off) & (BytesPerLong-1)) != 0) { | |
4818 // Non-aligned; too bad. | |
4819 // One more chance: Pick off an initial 32-bit word. | |
4820 // This is a common case, since abase can be odd mod 8. | |
4821 if (((src_off | dest_off) & (BytesPerLong-1)) == BytesPerInt && | |
4822 ((src_off ^ dest_off) & (BytesPerLong-1)) == 0) { | |
4823 Node* sptr = basic_plus_adr(src, src_off); | |
4824 Node* dptr = basic_plus_adr(dest, dest_off); | |
4825 Node* sval = make_load(control(), sptr, TypeInt::INT, T_INT, adr_type); | |
4826 store_to_memory(control(), dptr, sval, T_INT, adr_type); | |
4827 src_off += BytesPerInt; | |
4828 dest_off += BytesPerInt; | |
4829 } else { | |
4830 return false; | |
4831 } | |
4832 } | |
4833 assert(src_off % BytesPerLong == 0, ""); | |
4834 assert(dest_off % BytesPerLong == 0, ""); | |
4835 | |
4836 // Do this copy by giant steps. | |
4837 Node* sptr = basic_plus_adr(src, src_off); | |
4838 Node* dptr = basic_plus_adr(dest, dest_off); | |
4839 Node* countx = dest_size; | |
4840 countx = _gvn.transform( new (C, 3) SubXNode(countx, MakeConX(dest_off)) ); | |
4841 countx = _gvn.transform( new (C, 3) URShiftXNode(countx, intcon(LogBytesPerLong)) ); | |
4842 | |
4843 bool disjoint_bases = true; // since alloc != NULL | |
4844 generate_unchecked_arraycopy(adr_type, T_LONG, disjoint_bases, | |
4845 sptr, NULL, dptr, NULL, countx); | |
4846 | |
4847 return true; | |
4848 } | |
4849 | |
4850 | |
4851 // Helper function; generates code for the slow case. | |
4852 // We make a call to a runtime method which emulates the native method, | |
4853 // but without the native wrapper overhead. | |
4854 void | |
4855 LibraryCallKit::generate_slow_arraycopy(const TypePtr* adr_type, | |
4856 Node* src, Node* src_offset, | |
4857 Node* dest, Node* dest_offset, | |
4858 Node* copy_length, | |
4859 int nargs) { | |
4860 _sp += nargs; // any deopt will start just before call to enclosing method | |
4861 Node* call = make_runtime_call(RC_NO_LEAF | RC_UNCOMMON, | |
4862 OptoRuntime::slow_arraycopy_Type(), | |
4863 OptoRuntime::slow_arraycopy_Java(), | |
4864 "slow_arraycopy", adr_type, | |
4865 src, src_offset, dest, dest_offset, | |
4866 copy_length); | |
4867 _sp -= nargs; | |
4868 | |
4869 // Handle exceptions thrown by this fellow: | |
4870 make_slow_call_ex(call, env()->Throwable_klass(), false); | |
4871 } | |
4872 | |
4873 // Helper function; generates code for cases requiring runtime checks. | |
4874 Node* | |
4875 LibraryCallKit::generate_checkcast_arraycopy(const TypePtr* adr_type, | |
4876 Node* dest_elem_klass, | |
4877 Node* src, Node* src_offset, | |
4878 Node* dest, Node* dest_offset, | |
4879 Node* copy_length, | |
4880 int nargs) { | |
4881 if (stopped()) return NULL; | |
4882 | |
4883 address copyfunc_addr = StubRoutines::checkcast_arraycopy(); | |
4884 if (copyfunc_addr == NULL) { // Stub was not generated, go slow path. | |
4885 return NULL; | |
4886 } | |
4887 | |
4888 // Pick out the parameters required to perform a store-check | |
4889 // for the target array. This is an optimistic check. It will | |
4890 // look in each non-null element's class, at the desired klass's | |
4891 // super_check_offset, for the desired klass. | |
4892 int sco_offset = Klass::super_check_offset_offset_in_bytes() + sizeof(oopDesc); | |
4893 Node* p3 = basic_plus_adr(dest_elem_klass, sco_offset); | |
4894 Node* n3 = new(C, 3) LoadINode(NULL, immutable_memory(), p3, TypeRawPtr::BOTTOM); | |
4895 Node* check_offset = _gvn.transform(n3); | |
4896 Node* check_value = dest_elem_klass; | |
4897 | |
4898 Node* src_start = array_element_address(src, src_offset, T_OBJECT); | |
4899 Node* dest_start = array_element_address(dest, dest_offset, T_OBJECT); | |
4900 | |
4901 // (We know the arrays are never conjoint, because their types differ.) | |
4902 Node* call = make_runtime_call(RC_LEAF|RC_NO_FP, | |
4903 OptoRuntime::checkcast_arraycopy_Type(), | |
4904 copyfunc_addr, "checkcast_arraycopy", adr_type, | |
4905 // five arguments, of which two are | |
4906 // intptr_t (jlong in LP64) | |
4907 src_start, dest_start, | |
4908 copy_length XTOP, | |
4909 check_offset XTOP, | |
4910 check_value); | |
4911 | |
4912 return _gvn.transform(new (C, 1) ProjNode(call, TypeFunc::Parms)); | |
4913 } | |
4914 | |
4915 | |
4916 // Helper function; generates code for cases requiring runtime checks. | |
4917 Node* | |
4918 LibraryCallKit::generate_generic_arraycopy(const TypePtr* adr_type, | |
4919 Node* src, Node* src_offset, | |
4920 Node* dest, Node* dest_offset, | |
4921 Node* copy_length, | |
4922 int nargs) { | |
4923 if (stopped()) return NULL; | |
4924 | |
4925 address copyfunc_addr = StubRoutines::generic_arraycopy(); | |
4926 if (copyfunc_addr == NULL) { // Stub was not generated, go slow path. | |
4927 return NULL; | |
4928 } | |
4929 | |
4930 Node* call = make_runtime_call(RC_LEAF|RC_NO_FP, | |
4931 OptoRuntime::generic_arraycopy_Type(), | |
4932 copyfunc_addr, "generic_arraycopy", adr_type, | |
4933 src, src_offset, dest, dest_offset, copy_length); | |
4934 | |
4935 return _gvn.transform(new (C, 1) ProjNode(call, TypeFunc::Parms)); | |
4936 } | |
4937 | |
4938 // Helper function; generates the fast out-of-line call to an arraycopy stub. | |
4939 void | |
4940 LibraryCallKit::generate_unchecked_arraycopy(const TypePtr* adr_type, | |
4941 BasicType basic_elem_type, | |
4942 bool disjoint_bases, | |
4943 Node* src, Node* src_offset, | |
4944 Node* dest, Node* dest_offset, | |
4945 Node* copy_length) { | |
4946 if (stopped()) return; // nothing to do | |
4947 | |
4948 Node* src_start = src; | |
4949 Node* dest_start = dest; | |
4950 if (src_offset != NULL || dest_offset != NULL) { | |
4951 assert(src_offset != NULL && dest_offset != NULL, ""); | |
4952 src_start = array_element_address(src, src_offset, basic_elem_type); | |
4953 dest_start = array_element_address(dest, dest_offset, basic_elem_type); | |
4954 } | |
4955 | |
4956 // Figure out which arraycopy runtime method to call. | |
4957 const char* copyfunc_name = "arraycopy"; | |
4958 address copyfunc_addr = | |
4959 basictype2arraycopy(basic_elem_type, src_offset, dest_offset, | |
4960 disjoint_bases, copyfunc_name); | |
4961 | |
4962 // Call it. Note that the count_ix value is not scaled to a byte-size. | |
4963 make_runtime_call(RC_LEAF|RC_NO_FP, | |
4964 OptoRuntime::fast_arraycopy_Type(), | |
4965 copyfunc_addr, copyfunc_name, adr_type, | |
4966 src_start, dest_start, copy_length XTOP); | |
4967 } |