Mercurial > hg > graal-compiler
annotate src/share/vm/c1/c1_Runtime1.cpp @ 3759:cfcf2ba8f3eb
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author | never |
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date | Wed, 15 Jun 2011 10:20:03 -0700 |
parents | 7ec4bb02d5f0 |
children | be4ca325525a 2c359f27615c |
rev | line source |
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0 | 1 /* |
2142 | 2 * Copyright (c) 1999, 2011, Oracle and/or its affiliates. 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 * | |
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19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
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20 * or visit www.oracle.com if you need additional information or have any |
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21 * questions. |
0 | 22 * |
23 */ | |
24 | |
1972 | 25 #include "precompiled.hpp" |
26 #include "asm/codeBuffer.hpp" | |
27 #include "c1/c1_CodeStubs.hpp" | |
28 #include "c1/c1_Defs.hpp" | |
29 #include "c1/c1_FrameMap.hpp" | |
30 #include "c1/c1_LIRAssembler.hpp" | |
31 #include "c1/c1_MacroAssembler.hpp" | |
32 #include "c1/c1_Runtime1.hpp" | |
33 #include "classfile/systemDictionary.hpp" | |
34 #include "classfile/vmSymbols.hpp" | |
35 #include "code/codeBlob.hpp" | |
36 #include "code/compiledIC.hpp" | |
37 #include "code/pcDesc.hpp" | |
38 #include "code/scopeDesc.hpp" | |
39 #include "code/vtableStubs.hpp" | |
40 #include "compiler/disassembler.hpp" | |
41 #include "gc_interface/collectedHeap.hpp" | |
42 #include "interpreter/bytecode.hpp" | |
43 #include "interpreter/interpreter.hpp" | |
44 #include "memory/allocation.inline.hpp" | |
45 #include "memory/barrierSet.hpp" | |
46 #include "memory/oopFactory.hpp" | |
47 #include "memory/resourceArea.hpp" | |
48 #include "oops/objArrayKlass.hpp" | |
49 #include "oops/oop.inline.hpp" | |
50 #include "runtime/biasedLocking.hpp" | |
51 #include "runtime/compilationPolicy.hpp" | |
52 #include "runtime/interfaceSupport.hpp" | |
53 #include "runtime/javaCalls.hpp" | |
54 #include "runtime/sharedRuntime.hpp" | |
55 #include "runtime/threadCritical.hpp" | |
56 #include "runtime/vframe.hpp" | |
57 #include "runtime/vframeArray.hpp" | |
58 #include "utilities/copy.hpp" | |
59 #include "utilities/events.hpp" | |
0 | 60 |
61 | |
62 // Implementation of StubAssembler | |
63 | |
64 StubAssembler::StubAssembler(CodeBuffer* code, const char * name, int stub_id) : C1_MacroAssembler(code) { | |
65 _name = name; | |
66 _must_gc_arguments = false; | |
67 _frame_size = no_frame_size; | |
68 _num_rt_args = 0; | |
69 _stub_id = stub_id; | |
70 } | |
71 | |
72 | |
73 void StubAssembler::set_info(const char* name, bool must_gc_arguments) { | |
74 _name = name; | |
75 _must_gc_arguments = must_gc_arguments; | |
76 } | |
77 | |
78 | |
79 void StubAssembler::set_frame_size(int size) { | |
80 if (_frame_size == no_frame_size) { | |
81 _frame_size = size; | |
82 } | |
83 assert(_frame_size == size, "can't change the frame size"); | |
84 } | |
85 | |
86 | |
87 void StubAssembler::set_num_rt_args(int args) { | |
88 if (_num_rt_args == 0) { | |
89 _num_rt_args = args; | |
90 } | |
91 assert(_num_rt_args == args, "can't change the number of args"); | |
92 } | |
93 | |
94 // Implementation of Runtime1 | |
95 | |
96 CodeBlob* Runtime1::_blobs[Runtime1::number_of_ids]; | |
97 const char *Runtime1::_blob_names[] = { | |
98 RUNTIME1_STUBS(STUB_NAME, LAST_STUB_NAME) | |
99 }; | |
100 | |
101 #ifndef PRODUCT | |
102 // statistics | |
103 int Runtime1::_generic_arraycopy_cnt = 0; | |
104 int Runtime1::_primitive_arraycopy_cnt = 0; | |
105 int Runtime1::_oop_arraycopy_cnt = 0; | |
2446 | 106 int Runtime1::_generic_arraycopystub_cnt = 0; |
0 | 107 int Runtime1::_arraycopy_slowcase_cnt = 0; |
2446 | 108 int Runtime1::_arraycopy_checkcast_cnt = 0; |
109 int Runtime1::_arraycopy_checkcast_attempt_cnt = 0; | |
0 | 110 int Runtime1::_new_type_array_slowcase_cnt = 0; |
111 int Runtime1::_new_object_array_slowcase_cnt = 0; | |
112 int Runtime1::_new_instance_slowcase_cnt = 0; | |
113 int Runtime1::_new_multi_array_slowcase_cnt = 0; | |
114 int Runtime1::_monitorenter_slowcase_cnt = 0; | |
115 int Runtime1::_monitorexit_slowcase_cnt = 0; | |
116 int Runtime1::_patch_code_slowcase_cnt = 0; | |
117 int Runtime1::_throw_range_check_exception_count = 0; | |
118 int Runtime1::_throw_index_exception_count = 0; | |
119 int Runtime1::_throw_div0_exception_count = 0; | |
120 int Runtime1::_throw_null_pointer_exception_count = 0; | |
121 int Runtime1::_throw_class_cast_exception_count = 0; | |
122 int Runtime1::_throw_incompatible_class_change_error_count = 0; | |
123 int Runtime1::_throw_array_store_exception_count = 0; | |
124 int Runtime1::_throw_count = 0; | |
2446 | 125 |
126 static int _byte_arraycopy_cnt = 0; | |
127 static int _short_arraycopy_cnt = 0; | |
128 static int _int_arraycopy_cnt = 0; | |
129 static int _long_arraycopy_cnt = 0; | |
130 static int _oop_arraycopy_cnt = 0; | |
131 | |
132 address Runtime1::arraycopy_count_address(BasicType type) { | |
133 switch (type) { | |
134 case T_BOOLEAN: | |
135 case T_BYTE: return (address)&_byte_arraycopy_cnt; | |
136 case T_CHAR: | |
137 case T_SHORT: return (address)&_short_arraycopy_cnt; | |
138 case T_FLOAT: | |
139 case T_INT: return (address)&_int_arraycopy_cnt; | |
140 case T_DOUBLE: | |
141 case T_LONG: return (address)&_long_arraycopy_cnt; | |
142 case T_ARRAY: | |
143 case T_OBJECT: return (address)&_oop_arraycopy_cnt; | |
144 default: | |
145 ShouldNotReachHere(); | |
146 return NULL; | |
147 } | |
148 } | |
149 | |
150 | |
0 | 151 #endif |
152 | |
153 // Simple helper to see if the caller of a runtime stub which | |
154 // entered the VM has been deoptimized | |
155 | |
156 static bool caller_is_deopted() { | |
157 JavaThread* thread = JavaThread::current(); | |
158 RegisterMap reg_map(thread, false); | |
159 frame runtime_frame = thread->last_frame(); | |
160 frame caller_frame = runtime_frame.sender(®_map); | |
161 assert(caller_frame.is_compiled_frame(), "must be compiled"); | |
162 return caller_frame.is_deoptimized_frame(); | |
163 } | |
164 | |
165 // Stress deoptimization | |
166 static void deopt_caller() { | |
167 if ( !caller_is_deopted()) { | |
168 JavaThread* thread = JavaThread::current(); | |
169 RegisterMap reg_map(thread, false); | |
170 frame runtime_frame = thread->last_frame(); | |
171 frame caller_frame = runtime_frame.sender(®_map); | |
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172 Deoptimization::deoptimize_frame(thread, caller_frame.id()); |
0 | 173 assert(caller_is_deopted(), "Must be deoptimized"); |
174 } | |
175 } | |
176 | |
177 | |
1584 | 178 void Runtime1::generate_blob_for(BufferBlob* buffer_blob, StubID id) { |
0 | 179 assert(0 <= id && id < number_of_ids, "illegal stub id"); |
180 ResourceMark rm; | |
181 // create code buffer for code storage | |
1748 | 182 CodeBuffer code(buffer_blob); |
0 | 183 |
1584 | 184 Compilation::setup_code_buffer(&code, 0); |
0 | 185 |
186 // create assembler for code generation | |
187 StubAssembler* sasm = new StubAssembler(&code, name_for(id), id); | |
188 // generate code for runtime stub | |
189 OopMapSet* oop_maps; | |
190 oop_maps = generate_code_for(id, sasm); | |
191 assert(oop_maps == NULL || sasm->frame_size() != no_frame_size, | |
192 "if stub has an oop map it must have a valid frame size"); | |
193 | |
194 #ifdef ASSERT | |
195 // Make sure that stubs that need oopmaps have them | |
196 switch (id) { | |
197 // These stubs don't need to have an oopmap | |
198 case dtrace_object_alloc_id: | |
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199 case g1_pre_barrier_slow_id: |
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200 case g1_post_barrier_slow_id: |
0 | 201 case slow_subtype_check_id: |
202 case fpu2long_stub_id: | |
203 case unwind_exception_id: | |
1783 | 204 case counter_overflow_id: |
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205 #if defined(SPARC) || defined(PPC) |
0 | 206 case handle_exception_nofpu_id: // Unused on sparc |
207 #endif | |
208 break; | |
209 | |
210 // All other stubs should have oopmaps | |
211 default: | |
212 assert(oop_maps != NULL, "must have an oopmap"); | |
213 } | |
214 #endif | |
215 | |
216 // align so printing shows nop's instead of random code at the end (SimpleStubs are aligned) | |
217 sasm->align(BytesPerWord); | |
218 // make sure all code is in code buffer | |
219 sasm->flush(); | |
220 // create blob - distinguish a few special cases | |
221 CodeBlob* blob = RuntimeStub::new_runtime_stub(name_for(id), | |
222 &code, | |
223 CodeOffsets::frame_never_safe, | |
224 sasm->frame_size(), | |
225 oop_maps, | |
226 sasm->must_gc_arguments()); | |
227 // install blob | |
228 assert(blob != NULL, "blob must exist"); | |
229 _blobs[id] = blob; | |
230 } | |
231 | |
232 | |
1584 | 233 void Runtime1::initialize(BufferBlob* blob) { |
234 // platform-dependent initialization | |
235 initialize_pd(); | |
236 // generate stubs | |
237 for (int id = 0; id < number_of_ids; id++) generate_blob_for(blob, (StubID)id); | |
238 // printing | |
0 | 239 #ifndef PRODUCT |
1584 | 240 if (PrintSimpleStubs) { |
241 ResourceMark rm; | |
242 for (int id = 0; id < number_of_ids; id++) { | |
243 _blobs[id]->print(); | |
244 if (_blobs[id]->oop_maps() != NULL) { | |
245 _blobs[id]->oop_maps()->print(); | |
0 | 246 } |
247 } | |
1584 | 248 } |
0 | 249 #endif |
250 } | |
251 | |
252 | |
253 CodeBlob* Runtime1::blob_for(StubID id) { | |
254 assert(0 <= id && id < number_of_ids, "illegal stub id"); | |
255 return _blobs[id]; | |
256 } | |
257 | |
258 | |
259 const char* Runtime1::name_for(StubID id) { | |
260 assert(0 <= id && id < number_of_ids, "illegal stub id"); | |
261 return _blob_names[id]; | |
262 } | |
263 | |
264 const char* Runtime1::name_for_address(address entry) { | |
265 for (int id = 0; id < number_of_ids; id++) { | |
266 if (entry == entry_for((StubID)id)) return name_for((StubID)id); | |
267 } | |
268 | |
269 #define FUNCTION_CASE(a, f) \ | |
270 if ((intptr_t)a == CAST_FROM_FN_PTR(intptr_t, f)) return #f | |
271 | |
272 FUNCTION_CASE(entry, os::javaTimeMillis); | |
273 FUNCTION_CASE(entry, os::javaTimeNanos); | |
274 FUNCTION_CASE(entry, SharedRuntime::OSR_migration_end); | |
275 FUNCTION_CASE(entry, SharedRuntime::d2f); | |
276 FUNCTION_CASE(entry, SharedRuntime::d2i); | |
277 FUNCTION_CASE(entry, SharedRuntime::d2l); | |
278 FUNCTION_CASE(entry, SharedRuntime::dcos); | |
279 FUNCTION_CASE(entry, SharedRuntime::dexp); | |
280 FUNCTION_CASE(entry, SharedRuntime::dlog); | |
281 FUNCTION_CASE(entry, SharedRuntime::dlog10); | |
282 FUNCTION_CASE(entry, SharedRuntime::dpow); | |
283 FUNCTION_CASE(entry, SharedRuntime::drem); | |
284 FUNCTION_CASE(entry, SharedRuntime::dsin); | |
285 FUNCTION_CASE(entry, SharedRuntime::dtan); | |
286 FUNCTION_CASE(entry, SharedRuntime::f2i); | |
287 FUNCTION_CASE(entry, SharedRuntime::f2l); | |
288 FUNCTION_CASE(entry, SharedRuntime::frem); | |
289 FUNCTION_CASE(entry, SharedRuntime::l2d); | |
290 FUNCTION_CASE(entry, SharedRuntime::l2f); | |
291 FUNCTION_CASE(entry, SharedRuntime::ldiv); | |
292 FUNCTION_CASE(entry, SharedRuntime::lmul); | |
293 FUNCTION_CASE(entry, SharedRuntime::lrem); | |
294 FUNCTION_CASE(entry, SharedRuntime::lrem); | |
295 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_entry); | |
296 FUNCTION_CASE(entry, SharedRuntime::dtrace_method_exit); | |
297 FUNCTION_CASE(entry, trace_block_entry); | |
298 | |
299 #undef FUNCTION_CASE | |
300 | |
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301 // Soft float adds more runtime names. |
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302 return pd_name_for_address(entry); |
0 | 303 } |
304 | |
305 | |
306 JRT_ENTRY(void, Runtime1::new_instance(JavaThread* thread, klassOopDesc* klass)) | |
307 NOT_PRODUCT(_new_instance_slowcase_cnt++;) | |
308 | |
309 assert(oop(klass)->is_klass(), "not a class"); | |
310 instanceKlassHandle h(thread, klass); | |
311 h->check_valid_for_instantiation(true, CHECK); | |
312 // make sure klass is initialized | |
313 h->initialize(CHECK); | |
314 // allocate instance and return via TLS | |
315 oop obj = h->allocate_instance(CHECK); | |
316 thread->set_vm_result(obj); | |
317 JRT_END | |
318 | |
319 | |
320 JRT_ENTRY(void, Runtime1::new_type_array(JavaThread* thread, klassOopDesc* klass, jint length)) | |
321 NOT_PRODUCT(_new_type_array_slowcase_cnt++;) | |
322 // Note: no handle for klass needed since they are not used | |
323 // anymore after new_typeArray() and no GC can happen before. | |
324 // (This may have to change if this code changes!) | |
325 assert(oop(klass)->is_klass(), "not a class"); | |
326 BasicType elt_type = typeArrayKlass::cast(klass)->element_type(); | |
327 oop obj = oopFactory::new_typeArray(elt_type, length, CHECK); | |
328 thread->set_vm_result(obj); | |
329 // This is pretty rare but this runtime patch is stressful to deoptimization | |
330 // if we deoptimize here so force a deopt to stress the path. | |
331 if (DeoptimizeALot) { | |
332 deopt_caller(); | |
333 } | |
334 | |
335 JRT_END | |
336 | |
337 | |
338 JRT_ENTRY(void, Runtime1::new_object_array(JavaThread* thread, klassOopDesc* array_klass, jint length)) | |
339 NOT_PRODUCT(_new_object_array_slowcase_cnt++;) | |
340 | |
341 // Note: no handle for klass needed since they are not used | |
342 // anymore after new_objArray() and no GC can happen before. | |
343 // (This may have to change if this code changes!) | |
344 assert(oop(array_klass)->is_klass(), "not a class"); | |
345 klassOop elem_klass = objArrayKlass::cast(array_klass)->element_klass(); | |
346 objArrayOop obj = oopFactory::new_objArray(elem_klass, length, CHECK); | |
347 thread->set_vm_result(obj); | |
348 // This is pretty rare but this runtime patch is stressful to deoptimization | |
349 // if we deoptimize here so force a deopt to stress the path. | |
350 if (DeoptimizeALot) { | |
351 deopt_caller(); | |
352 } | |
353 JRT_END | |
354 | |
355 | |
356 JRT_ENTRY(void, Runtime1::new_multi_array(JavaThread* thread, klassOopDesc* klass, int rank, jint* dims)) | |
357 NOT_PRODUCT(_new_multi_array_slowcase_cnt++;) | |
358 | |
359 assert(oop(klass)->is_klass(), "not a class"); | |
360 assert(rank >= 1, "rank must be nonzero"); | |
361 oop obj = arrayKlass::cast(klass)->multi_allocate(rank, dims, CHECK); | |
362 thread->set_vm_result(obj); | |
363 JRT_END | |
364 | |
365 | |
366 JRT_ENTRY(void, Runtime1::unimplemented_entry(JavaThread* thread, StubID id)) | |
367 tty->print_cr("Runtime1::entry_for(%d) returned unimplemented entry point", id); | |
368 JRT_END | |
369 | |
370 | |
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371 JRT_ENTRY(void, Runtime1::throw_array_store_exception(JavaThread* thread, oopDesc* obj)) |
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372 ResourceMark rm(thread); |
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373 const char* klass_name = Klass::cast(obj->klass())->external_name(); |
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374 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayStoreException(), klass_name); |
0 | 375 JRT_END |
376 | |
377 | |
378 JRT_ENTRY(void, Runtime1::post_jvmti_exception_throw(JavaThread* thread)) | |
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379 if (JvmtiExport::can_post_on_exceptions()) { |
0 | 380 vframeStream vfst(thread, true); |
381 address bcp = vfst.method()->bcp_from(vfst.bci()); | |
382 JvmtiExport::post_exception_throw(thread, vfst.method(), bcp, thread->exception_oop()); | |
383 } | |
384 JRT_END | |
385 | |
1783 | 386 // This is a helper to allow us to safepoint but allow the outer entry |
387 // to be safepoint free if we need to do an osr | |
388 static nmethod* counter_overflow_helper(JavaThread* THREAD, int branch_bci, methodOopDesc* m) { | |
389 nmethod* osr_nm = NULL; | |
390 methodHandle method(THREAD, m); | |
391 | |
392 RegisterMap map(THREAD, false); | |
393 frame fr = THREAD->last_frame().sender(&map); | |
0 | 394 nmethod* nm = (nmethod*) fr.cb(); |
1783 | 395 assert(nm!= NULL && nm->is_nmethod(), "Sanity check"); |
396 methodHandle enclosing_method(THREAD, nm->method()); | |
397 | |
398 CompLevel level = (CompLevel)nm->comp_level(); | |
399 int bci = InvocationEntryBci; | |
400 if (branch_bci != InvocationEntryBci) { | |
401 // Compute desination bci | |
402 address pc = method()->code_base() + branch_bci; | |
2142 | 403 Bytecodes::Code branch = Bytecodes::code_at(method(), pc); |
1783 | 404 int offset = 0; |
405 switch (branch) { | |
406 case Bytecodes::_if_icmplt: case Bytecodes::_iflt: | |
407 case Bytecodes::_if_icmpgt: case Bytecodes::_ifgt: | |
408 case Bytecodes::_if_icmple: case Bytecodes::_ifle: | |
409 case Bytecodes::_if_icmpge: case Bytecodes::_ifge: | |
410 case Bytecodes::_if_icmpeq: case Bytecodes::_if_acmpeq: case Bytecodes::_ifeq: | |
411 case Bytecodes::_if_icmpne: case Bytecodes::_if_acmpne: case Bytecodes::_ifne: | |
412 case Bytecodes::_ifnull: case Bytecodes::_ifnonnull: case Bytecodes::_goto: | |
413 offset = (int16_t)Bytes::get_Java_u2(pc + 1); | |
414 break; | |
415 case Bytecodes::_goto_w: | |
416 offset = Bytes::get_Java_u4(pc + 1); | |
417 break; | |
418 default: ; | |
0 | 419 } |
1783 | 420 bci = branch_bci + offset; |
421 } | |
422 | |
423 osr_nm = CompilationPolicy::policy()->event(enclosing_method, method, branch_bci, bci, level, THREAD); | |
424 return osr_nm; | |
425 } | |
426 | |
427 JRT_BLOCK_ENTRY(address, Runtime1::counter_overflow(JavaThread* thread, int bci, methodOopDesc* method)) | |
428 nmethod* osr_nm; | |
429 JRT_BLOCK | |
430 osr_nm = counter_overflow_helper(thread, bci, method); | |
431 if (osr_nm != NULL) { | |
432 RegisterMap map(thread, false); | |
433 frame fr = thread->last_frame().sender(&map); | |
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434 Deoptimization::deoptimize_frame(thread, fr.id()); |
0 | 435 } |
1783 | 436 JRT_BLOCK_END |
437 return NULL; | |
0 | 438 JRT_END |
439 | |
440 extern void vm_exit(int code); | |
441 | |
442 // Enter this method from compiled code handler below. This is where we transition | |
443 // to VM mode. This is done as a helper routine so that the method called directly | |
444 // from compiled code does not have to transition to VM. This allows the entry | |
445 // method to see if the nmethod that we have just looked up a handler for has | |
446 // been deoptimized while we were in the vm. This simplifies the assembly code | |
447 // cpu directories. | |
448 // | |
449 // We are entering here from exception stub (via the entry method below) | |
450 // If there is a compiled exception handler in this method, we will continue there; | |
451 // otherwise we will unwind the stack and continue at the caller of top frame method | |
452 // Note: we enter in Java using a special JRT wrapper. This wrapper allows us to | |
453 // control the area where we can allow a safepoint. After we exit the safepoint area we can | |
454 // check to see if the handler we are going to return is now in a nmethod that has | |
455 // been deoptimized. If that is the case we return the deopt blob | |
456 // unpack_with_exception entry instead. This makes life for the exception blob easier | |
457 // because making that same check and diverting is painful from assembly language. | |
458 JRT_ENTRY_NO_ASYNC(static address, exception_handler_for_pc_helper(JavaThread* thread, oopDesc* ex, address pc, nmethod*& nm)) | |
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459 // Reset method handle flag. |
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460 thread->set_is_method_handle_return(false); |
0 | 461 |
462 Handle exception(thread, ex); | |
463 nm = CodeCache::find_nmethod(pc); | |
464 assert(nm != NULL, "this is not an nmethod"); | |
465 // Adjust the pc as needed/ | |
466 if (nm->is_deopt_pc(pc)) { | |
467 RegisterMap map(thread, false); | |
468 frame exception_frame = thread->last_frame().sender(&map); | |
469 // if the frame isn't deopted then pc must not correspond to the caller of last_frame | |
470 assert(exception_frame.is_deoptimized_frame(), "must be deopted"); | |
471 pc = exception_frame.pc(); | |
472 } | |
473 #ifdef ASSERT | |
474 assert(exception.not_null(), "NULL exceptions should be handled by throw_exception"); | |
475 assert(exception->is_oop(), "just checking"); | |
476 // Check that exception is a subclass of Throwable, otherwise we have a VerifyError | |
1142 | 477 if (!(exception->is_a(SystemDictionary::Throwable_klass()))) { |
0 | 478 if (ExitVMOnVerifyError) vm_exit(-1); |
479 ShouldNotReachHere(); | |
480 } | |
481 #endif | |
482 | |
483 // Check the stack guard pages and reenable them if necessary and there is | |
484 // enough space on the stack to do so. Use fast exceptions only if the guard | |
485 // pages are enabled. | |
486 bool guard_pages_enabled = thread->stack_yellow_zone_enabled(); | |
487 if (!guard_pages_enabled) guard_pages_enabled = thread->reguard_stack(); | |
488 | |
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489 if (JvmtiExport::can_post_on_exceptions()) { |
0 | 490 // To ensure correct notification of exception catches and throws |
491 // we have to deoptimize here. If we attempted to notify the | |
492 // catches and throws during this exception lookup it's possible | |
493 // we could deoptimize on the way out of the VM and end back in | |
494 // the interpreter at the throw site. This would result in double | |
495 // notifications since the interpreter would also notify about | |
496 // these same catches and throws as it unwound the frame. | |
497 | |
498 RegisterMap reg_map(thread); | |
499 frame stub_frame = thread->last_frame(); | |
500 frame caller_frame = stub_frame.sender(®_map); | |
501 | |
502 // We don't really want to deoptimize the nmethod itself since we | |
503 // can actually continue in the exception handler ourselves but I | |
504 // don't see an easy way to have the desired effect. | |
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505 Deoptimization::deoptimize_frame(thread, caller_frame.id()); |
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506 assert(caller_is_deopted(), "Must be deoptimized"); |
0 | 507 |
508 return SharedRuntime::deopt_blob()->unpack_with_exception_in_tls(); | |
509 } | |
510 | |
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511 // ExceptionCache is used only for exceptions at call sites and not for implicit exceptions |
0 | 512 if (guard_pages_enabled) { |
513 address fast_continuation = nm->handler_for_exception_and_pc(exception, pc); | |
514 if (fast_continuation != NULL) { | |
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515 // Set flag if return address is a method handle call site. |
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516 thread->set_is_method_handle_return(nm->is_method_handle_return(pc)); |
0 | 517 return fast_continuation; |
518 } | |
519 } | |
520 | |
521 // If the stack guard pages are enabled, check whether there is a handler in | |
522 // the current method. Otherwise (guard pages disabled), force an unwind and | |
523 // skip the exception cache update (i.e., just leave continuation==NULL). | |
524 address continuation = NULL; | |
525 if (guard_pages_enabled) { | |
526 | |
527 // New exception handling mechanism can support inlined methods | |
528 // with exception handlers since the mappings are from PC to PC | |
529 | |
530 // debugging support | |
531 // tracing | |
532 if (TraceExceptions) { | |
533 ttyLocker ttyl; | |
534 ResourceMark rm; | |
535 tty->print_cr("Exception <%s> (0x%x) thrown in compiled method <%s> at PC " PTR_FORMAT " for thread 0x%x", | |
536 exception->print_value_string(), (address)exception(), nm->method()->print_value_string(), pc, thread); | |
537 } | |
538 // for AbortVMOnException flag | |
539 NOT_PRODUCT(Exceptions::debug_check_abort(exception)); | |
540 | |
541 // Clear out the exception oop and pc since looking up an | |
542 // exception handler can cause class loading, which might throw an | |
543 // exception and those fields are expected to be clear during | |
544 // normal bytecode execution. | |
545 thread->set_exception_oop(NULL); | |
546 thread->set_exception_pc(NULL); | |
547 | |
548 continuation = SharedRuntime::compute_compiled_exc_handler(nm, pc, exception, false, false); | |
549 // If an exception was thrown during exception dispatch, the exception oop may have changed | |
550 thread->set_exception_oop(exception()); | |
551 thread->set_exception_pc(pc); | |
552 | |
553 // the exception cache is used only by non-implicit exceptions | |
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554 if (continuation != NULL) { |
0 | 555 nm->add_handler_for_exception_and_pc(exception, pc, continuation); |
556 } | |
557 } | |
558 | |
559 thread->set_vm_result(exception()); | |
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560 // Set flag if return address is a method handle call site. |
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561 thread->set_is_method_handle_return(nm->is_method_handle_return(pc)); |
0 | 562 |
563 if (TraceExceptions) { | |
564 ttyLocker ttyl; | |
565 ResourceMark rm; | |
566 tty->print_cr("Thread " PTR_FORMAT " continuing at PC " PTR_FORMAT " for exception thrown at PC " PTR_FORMAT, | |
567 thread, continuation, pc); | |
568 } | |
569 | |
570 return continuation; | |
571 JRT_END | |
572 | |
573 // Enter this method from compiled code only if there is a Java exception handler | |
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574 // in the method handling the exception. |
0 | 575 // We are entering here from exception stub. We don't do a normal VM transition here. |
576 // We do it in a helper. This is so we can check to see if the nmethod we have just | |
577 // searched for an exception handler has been deoptimized in the meantime. | |
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578 address Runtime1::exception_handler_for_pc(JavaThread* thread) { |
0 | 579 oop exception = thread->exception_oop(); |
580 address pc = thread->exception_pc(); | |
581 // Still in Java mode | |
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582 DEBUG_ONLY(ResetNoHandleMark rnhm); |
0 | 583 nmethod* nm = NULL; |
584 address continuation = NULL; | |
585 { | |
586 // Enter VM mode by calling the helper | |
587 ResetNoHandleMark rnhm; | |
588 continuation = exception_handler_for_pc_helper(thread, exception, pc, nm); | |
589 } | |
590 // Back in JAVA, use no oops DON'T safepoint | |
591 | |
592 // Now check to see if the nmethod we were called from is now deoptimized. | |
593 // If so we must return to the deopt blob and deoptimize the nmethod | |
594 if (nm != NULL && caller_is_deopted()) { | |
595 continuation = SharedRuntime::deopt_blob()->unpack_with_exception_in_tls(); | |
596 } | |
597 | |
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598 assert(continuation != NULL, "no handler found"); |
0 | 599 return continuation; |
600 } | |
601 | |
602 | |
603 JRT_ENTRY(void, Runtime1::throw_range_check_exception(JavaThread* thread, int index)) | |
604 NOT_PRODUCT(_throw_range_check_exception_count++;) | |
605 Events::log("throw_range_check"); | |
606 char message[jintAsStringSize]; | |
607 sprintf(message, "%d", index); | |
608 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArrayIndexOutOfBoundsException(), message); | |
609 JRT_END | |
610 | |
611 | |
612 JRT_ENTRY(void, Runtime1::throw_index_exception(JavaThread* thread, int index)) | |
613 NOT_PRODUCT(_throw_index_exception_count++;) | |
614 Events::log("throw_index"); | |
615 char message[16]; | |
616 sprintf(message, "%d", index); | |
617 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IndexOutOfBoundsException(), message); | |
618 JRT_END | |
619 | |
620 | |
621 JRT_ENTRY(void, Runtime1::throw_div0_exception(JavaThread* thread)) | |
622 NOT_PRODUCT(_throw_div0_exception_count++;) | |
623 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_ArithmeticException(), "/ by zero"); | |
624 JRT_END | |
625 | |
626 | |
627 JRT_ENTRY(void, Runtime1::throw_null_pointer_exception(JavaThread* thread)) | |
628 NOT_PRODUCT(_throw_null_pointer_exception_count++;) | |
629 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_NullPointerException()); | |
630 JRT_END | |
631 | |
632 | |
633 JRT_ENTRY(void, Runtime1::throw_class_cast_exception(JavaThread* thread, oopDesc* object)) | |
634 NOT_PRODUCT(_throw_class_cast_exception_count++;) | |
635 ResourceMark rm(thread); | |
636 char* message = SharedRuntime::generate_class_cast_message( | |
637 thread, Klass::cast(object->klass())->external_name()); | |
638 SharedRuntime::throw_and_post_jvmti_exception( | |
639 thread, vmSymbols::java_lang_ClassCastException(), message); | |
640 JRT_END | |
641 | |
642 | |
643 JRT_ENTRY(void, Runtime1::throw_incompatible_class_change_error(JavaThread* thread)) | |
644 NOT_PRODUCT(_throw_incompatible_class_change_error_count++;) | |
645 ResourceMark rm(thread); | |
646 SharedRuntime::throw_and_post_jvmti_exception(thread, vmSymbols::java_lang_IncompatibleClassChangeError()); | |
647 JRT_END | |
648 | |
649 | |
650 JRT_ENTRY_NO_ASYNC(void, Runtime1::monitorenter(JavaThread* thread, oopDesc* obj, BasicObjectLock* lock)) | |
651 NOT_PRODUCT(_monitorenter_slowcase_cnt++;) | |
652 if (PrintBiasedLockingStatistics) { | |
653 Atomic::inc(BiasedLocking::slow_path_entry_count_addr()); | |
654 } | |
655 Handle h_obj(thread, obj); | |
656 assert(h_obj()->is_oop(), "must be NULL or an object"); | |
657 if (UseBiasedLocking) { | |
658 // Retry fast entry if bias is revoked to avoid unnecessary inflation | |
659 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), true, CHECK); | |
660 } else { | |
661 if (UseFastLocking) { | |
662 // When using fast locking, the compiled code has already tried the fast case | |
663 assert(obj == lock->obj(), "must match"); | |
664 ObjectSynchronizer::slow_enter(h_obj, lock->lock(), THREAD); | |
665 } else { | |
666 lock->set_obj(obj); | |
667 ObjectSynchronizer::fast_enter(h_obj, lock->lock(), false, THREAD); | |
668 } | |
669 } | |
670 JRT_END | |
671 | |
672 | |
673 JRT_LEAF(void, Runtime1::monitorexit(JavaThread* thread, BasicObjectLock* lock)) | |
674 NOT_PRODUCT(_monitorexit_slowcase_cnt++;) | |
675 assert(thread == JavaThread::current(), "threads must correspond"); | |
676 assert(thread->last_Java_sp(), "last_Java_sp must be set"); | |
677 // monitorexit is non-blocking (leaf routine) => no exceptions can be thrown | |
678 EXCEPTION_MARK; | |
679 | |
680 oop obj = lock->obj(); | |
681 assert(obj->is_oop(), "must be NULL or an object"); | |
682 if (UseFastLocking) { | |
683 // When using fast locking, the compiled code has already tried the fast case | |
684 ObjectSynchronizer::slow_exit(obj, lock->lock(), THREAD); | |
685 } else { | |
686 ObjectSynchronizer::fast_exit(obj, lock->lock(), THREAD); | |
687 } | |
688 JRT_END | |
689 | |
690 | |
691 static klassOop resolve_field_return_klass(methodHandle caller, int bci, TRAPS) { | |
2142 | 692 Bytecode_field field_access(caller, bci); |
0 | 693 // This can be static or non-static field access |
2142 | 694 Bytecodes::Code code = field_access.code(); |
0 | 695 |
696 // We must load class, initialize class and resolvethe field | |
697 FieldAccessInfo result; // initialize class if needed | |
698 constantPoolHandle constants(THREAD, caller->constants()); | |
2142 | 699 LinkResolver::resolve_field(result, constants, field_access.index(), Bytecodes::java_code(code), false, CHECK_NULL); |
0 | 700 return result.klass()(); |
701 } | |
702 | |
703 | |
704 // | |
705 // This routine patches sites where a class wasn't loaded or | |
706 // initialized at the time the code was generated. It handles | |
707 // references to classes, fields and forcing of initialization. Most | |
708 // of the cases are straightforward and involving simply forcing | |
709 // resolution of a class, rewriting the instruction stream with the | |
710 // needed constant and replacing the call in this function with the | |
711 // patched code. The case for static field is more complicated since | |
712 // the thread which is in the process of initializing a class can | |
713 // access it's static fields but other threads can't so the code | |
714 // either has to deoptimize when this case is detected or execute a | |
715 // check that the current thread is the initializing thread. The | |
716 // current | |
717 // | |
718 // Patches basically look like this: | |
719 // | |
720 // | |
721 // patch_site: jmp patch stub ;; will be patched | |
722 // continue: ... | |
723 // ... | |
724 // ... | |
725 // ... | |
726 // | |
727 // They have a stub which looks like this: | |
728 // | |
729 // ;; patch body | |
730 // movl <const>, reg (for class constants) | |
731 // <or> movl [reg1 + <const>], reg (for field offsets) | |
732 // <or> movl reg, [reg1 + <const>] (for field offsets) | |
733 // <being_init offset> <bytes to copy> <bytes to skip> | |
734 // patch_stub: call Runtime1::patch_code (through a runtime stub) | |
735 // jmp patch_site | |
736 // | |
737 // | |
738 // A normal patch is done by rewriting the patch body, usually a move, | |
739 // and then copying it into place over top of the jmp instruction | |
740 // being careful to flush caches and doing it in an MP-safe way. The | |
741 // constants following the patch body are used to find various pieces | |
742 // of the patch relative to the call site for Runtime1::patch_code. | |
743 // The case for getstatic and putstatic is more complicated because | |
744 // getstatic and putstatic have special semantics when executing while | |
745 // the class is being initialized. getstatic/putstatic on a class | |
746 // which is being_initialized may be executed by the initializing | |
747 // thread but other threads have to block when they execute it. This | |
748 // is accomplished in compiled code by executing a test of the current | |
749 // thread against the initializing thread of the class. It's emitted | |
750 // as boilerplate in their stub which allows the patched code to be | |
751 // executed before it's copied back into the main body of the nmethod. | |
752 // | |
753 // being_init: get_thread(<tmp reg> | |
754 // cmpl [reg1 + <init_thread_offset>], <tmp reg> | |
755 // jne patch_stub | |
756 // movl [reg1 + <const>], reg (for field offsets) <or> | |
757 // movl reg, [reg1 + <const>] (for field offsets) | |
758 // jmp continue | |
759 // <being_init offset> <bytes to copy> <bytes to skip> | |
760 // patch_stub: jmp Runtim1::patch_code (through a runtime stub) | |
761 // jmp patch_site | |
762 // | |
763 // If the class is being initialized the patch body is rewritten and | |
764 // the patch site is rewritten to jump to being_init, instead of | |
765 // patch_stub. Whenever this code is executed it checks the current | |
766 // thread against the intializing thread so other threads will enter | |
767 // the runtime and end up blocked waiting the class to finish | |
768 // initializing inside the calls to resolve_field below. The | |
769 // initializing class will continue on it's way. Once the class is | |
770 // fully_initialized, the intializing_thread of the class becomes | |
771 // NULL, so the next thread to execute this code will fail the test, | |
772 // call into patch_code and complete the patching process by copying | |
773 // the patch body back into the main part of the nmethod and resume | |
774 // executing. | |
775 // | |
776 // | |
777 | |
778 JRT_ENTRY(void, Runtime1::patch_code(JavaThread* thread, Runtime1::StubID stub_id )) | |
779 NOT_PRODUCT(_patch_code_slowcase_cnt++;) | |
780 | |
781 ResourceMark rm(thread); | |
782 RegisterMap reg_map(thread, false); | |
783 frame runtime_frame = thread->last_frame(); | |
784 frame caller_frame = runtime_frame.sender(®_map); | |
785 | |
786 // last java frame on stack | |
787 vframeStream vfst(thread, true); | |
788 assert(!vfst.at_end(), "Java frame must exist"); | |
789 | |
790 methodHandle caller_method(THREAD, vfst.method()); | |
791 // Note that caller_method->code() may not be same as caller_code because of OSR's | |
792 // Note also that in the presence of inlining it is not guaranteed | |
793 // that caller_method() == caller_code->method() | |
794 | |
795 | |
796 int bci = vfst.bci(); | |
797 | |
798 Events::log("patch_code @ " INTPTR_FORMAT , caller_frame.pc()); | |
799 | |
2142 | 800 Bytecodes::Code code = caller_method()->java_code_at(bci); |
0 | 801 |
802 #ifndef PRODUCT | |
803 // this is used by assertions in the access_field_patching_id | |
804 BasicType patch_field_type = T_ILLEGAL; | |
805 #endif // PRODUCT | |
806 bool deoptimize_for_volatile = false; | |
807 int patch_field_offset = -1; | |
808 KlassHandle init_klass(THREAD, klassOop(NULL)); // klass needed by access_field_patching code | |
809 Handle load_klass(THREAD, NULL); // oop needed by load_klass_patching code | |
810 if (stub_id == Runtime1::access_field_patching_id) { | |
811 | |
2142 | 812 Bytecode_field field_access(caller_method, bci); |
0 | 813 FieldAccessInfo result; // initialize class if needed |
2142 | 814 Bytecodes::Code code = field_access.code(); |
0 | 815 constantPoolHandle constants(THREAD, caller_method->constants()); |
2142 | 816 LinkResolver::resolve_field(result, constants, field_access.index(), Bytecodes::java_code(code), false, CHECK); |
0 | 817 patch_field_offset = result.field_offset(); |
818 | |
819 // If we're patching a field which is volatile then at compile it | |
820 // must not have been know to be volatile, so the generated code | |
821 // isn't correct for a volatile reference. The nmethod has to be | |
822 // deoptimized so that the code can be regenerated correctly. | |
823 // This check is only needed for access_field_patching since this | |
824 // is the path for patching field offsets. load_klass is only | |
825 // used for patching references to oops which don't need special | |
826 // handling in the volatile case. | |
827 deoptimize_for_volatile = result.access_flags().is_volatile(); | |
828 | |
829 #ifndef PRODUCT | |
830 patch_field_type = result.field_type(); | |
831 #endif | |
832 } else if (stub_id == Runtime1::load_klass_patching_id) { | |
833 oop k; | |
834 switch (code) { | |
835 case Bytecodes::_putstatic: | |
836 case Bytecodes::_getstatic: | |
837 { klassOop klass = resolve_field_return_klass(caller_method, bci, CHECK); | |
838 // Save a reference to the class that has to be checked for initialization | |
839 init_klass = KlassHandle(THREAD, klass); | |
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840 k = klass->java_mirror(); |
0 | 841 } |
842 break; | |
843 case Bytecodes::_new: | |
2142 | 844 { Bytecode_new bnew(caller_method(), caller_method->bcp_from(bci)); |
845 k = caller_method->constants()->klass_at(bnew.index(), CHECK); | |
0 | 846 } |
847 break; | |
848 case Bytecodes::_multianewarray: | |
2142 | 849 { Bytecode_multianewarray mna(caller_method(), caller_method->bcp_from(bci)); |
850 k = caller_method->constants()->klass_at(mna.index(), CHECK); | |
0 | 851 } |
852 break; | |
853 case Bytecodes::_instanceof: | |
2142 | 854 { Bytecode_instanceof io(caller_method(), caller_method->bcp_from(bci)); |
855 k = caller_method->constants()->klass_at(io.index(), CHECK); | |
0 | 856 } |
857 break; | |
858 case Bytecodes::_checkcast: | |
2142 | 859 { Bytecode_checkcast cc(caller_method(), caller_method->bcp_from(bci)); |
860 k = caller_method->constants()->klass_at(cc.index(), CHECK); | |
0 | 861 } |
862 break; | |
863 case Bytecodes::_anewarray: | |
2142 | 864 { Bytecode_anewarray anew(caller_method(), caller_method->bcp_from(bci)); |
865 klassOop ek = caller_method->constants()->klass_at(anew.index(), CHECK); | |
0 | 866 k = Klass::cast(ek)->array_klass(CHECK); |
867 } | |
868 break; | |
869 case Bytecodes::_ldc: | |
870 case Bytecodes::_ldc_w: | |
871 { | |
2142 | 872 Bytecode_loadconstant cc(caller_method, bci); |
873 k = cc.resolve_constant(CHECK); | |
1602 | 874 assert(k != NULL && !k->is_klass(), "must be class mirror or other Java constant"); |
0 | 875 } |
876 break; | |
877 default: Unimplemented(); | |
878 } | |
879 // convert to handle | |
880 load_klass = Handle(THREAD, k); | |
881 } else { | |
882 ShouldNotReachHere(); | |
883 } | |
884 | |
885 if (deoptimize_for_volatile) { | |
886 // At compile time we assumed the field wasn't volatile but after | |
887 // loading it turns out it was volatile so we have to throw the | |
888 // compiled code out and let it be regenerated. | |
889 if (TracePatching) { | |
890 tty->print_cr("Deoptimizing for patching volatile field reference"); | |
891 } | |
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892 // It's possible the nmethod was invalidated in the last |
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893 // safepoint, but if it's still alive then make it not_entrant. |
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894 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); |
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895 if (nm != NULL) { |
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896 nm->make_not_entrant(); |
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897 } |
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898 |
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899 Deoptimization::deoptimize_frame(thread, caller_frame.id()); |
0 | 900 |
901 // Return to the now deoptimized frame. | |
902 } | |
903 | |
1602 | 904 // If we are patching in a non-perm oop, make sure the nmethod |
905 // is on the right list. | |
906 if (ScavengeRootsInCode && load_klass.not_null() && load_klass->is_scavengable()) { | |
907 MutexLockerEx ml_code (CodeCache_lock, Mutex::_no_safepoint_check_flag); | |
908 nmethod* nm = CodeCache::find_nmethod(caller_frame.pc()); | |
909 guarantee(nm != NULL, "only nmethods can contain non-perm oops"); | |
910 if (!nm->on_scavenge_root_list()) | |
911 CodeCache::add_scavenge_root_nmethod(nm); | |
912 } | |
0 | 913 |
914 // Now copy code back | |
915 | |
916 { | |
917 MutexLockerEx ml_patch (Patching_lock, Mutex::_no_safepoint_check_flag); | |
918 // | |
919 // Deoptimization may have happened while we waited for the lock. | |
920 // In that case we don't bother to do any patching we just return | |
921 // and let the deopt happen | |
922 if (!caller_is_deopted()) { | |
923 NativeGeneralJump* jump = nativeGeneralJump_at(caller_frame.pc()); | |
924 address instr_pc = jump->jump_destination(); | |
925 NativeInstruction* ni = nativeInstruction_at(instr_pc); | |
926 if (ni->is_jump() ) { | |
927 // the jump has not been patched yet | |
928 // The jump destination is slow case and therefore not part of the stubs | |
929 // (stubs are only for StaticCalls) | |
930 | |
931 // format of buffer | |
932 // .... | |
933 // instr byte 0 <-- copy_buff | |
934 // instr byte 1 | |
935 // .. | |
936 // instr byte n-1 | |
937 // n | |
938 // .... <-- call destination | |
939 | |
940 address stub_location = caller_frame.pc() + PatchingStub::patch_info_offset(); | |
941 unsigned char* byte_count = (unsigned char*) (stub_location - 1); | |
942 unsigned char* byte_skip = (unsigned char*) (stub_location - 2); | |
943 unsigned char* being_initialized_entry_offset = (unsigned char*) (stub_location - 3); | |
944 address copy_buff = stub_location - *byte_skip - *byte_count; | |
945 address being_initialized_entry = stub_location - *being_initialized_entry_offset; | |
946 if (TracePatching) { | |
947 tty->print_cr(" Patching %s at bci %d at address 0x%x (%s)", Bytecodes::name(code), bci, | |
948 instr_pc, (stub_id == Runtime1::access_field_patching_id) ? "field" : "klass"); | |
949 nmethod* caller_code = CodeCache::find_nmethod(caller_frame.pc()); | |
950 assert(caller_code != NULL, "nmethod not found"); | |
951 | |
952 // NOTE we use pc() not original_pc() because we already know they are | |
953 // identical otherwise we'd have never entered this block of code | |
954 | |
955 OopMap* map = caller_code->oop_map_for_return_address(caller_frame.pc()); | |
956 assert(map != NULL, "null check"); | |
957 map->print(); | |
958 tty->cr(); | |
959 | |
960 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); | |
961 } | |
962 // depending on the code below, do_patch says whether to copy the patch body back into the nmethod | |
963 bool do_patch = true; | |
964 if (stub_id == Runtime1::access_field_patching_id) { | |
965 // The offset may not be correct if the class was not loaded at code generation time. | |
966 // Set it now. | |
967 NativeMovRegMem* n_move = nativeMovRegMem_at(copy_buff); | |
968 assert(n_move->offset() == 0 || (n_move->offset() == 4 && (patch_field_type == T_DOUBLE || patch_field_type == T_LONG)), "illegal offset for type"); | |
969 assert(patch_field_offset >= 0, "illegal offset"); | |
970 n_move->add_offset_in_bytes(patch_field_offset); | |
971 } else if (stub_id == Runtime1::load_klass_patching_id) { | |
972 // If a getstatic or putstatic is referencing a klass which | |
973 // isn't fully initialized, the patch body isn't copied into | |
974 // place until initialization is complete. In this case the | |
975 // patch site is setup so that any threads besides the | |
976 // initializing thread are forced to come into the VM and | |
977 // block. | |
978 do_patch = (code != Bytecodes::_getstatic && code != Bytecodes::_putstatic) || | |
979 instanceKlass::cast(init_klass())->is_initialized(); | |
980 NativeGeneralJump* jump = nativeGeneralJump_at(instr_pc); | |
981 if (jump->jump_destination() == being_initialized_entry) { | |
982 assert(do_patch == true, "initialization must be complete at this point"); | |
983 } else { | |
984 // patch the instruction <move reg, klass> | |
985 NativeMovConstReg* n_copy = nativeMovConstReg_at(copy_buff); | |
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986 |
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987 assert(n_copy->data() == 0 || |
1783 | 988 n_copy->data() == (intptr_t)Universe::non_oop_word(), |
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989 "illegal init value"); |
0 | 990 assert(load_klass() != NULL, "klass not set"); |
991 n_copy->set_data((intx) (load_klass())); | |
992 | |
993 if (TracePatching) { | |
994 Disassembler::decode(copy_buff, copy_buff + *byte_count, tty); | |
995 } | |
996 | |
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997 #if defined(SPARC) || defined(PPC) |
0 | 998 // Update the oop location in the nmethod with the proper |
999 // oop. When the code was generated, a NULL was stuffed | |
1000 // in the oop table and that table needs to be update to | |
1001 // have the right value. On intel the value is kept | |
1002 // directly in the instruction instead of in the oop | |
1003 // table, so set_data above effectively updated the value. | |
1004 nmethod* nm = CodeCache::find_nmethod(instr_pc); | |
1005 assert(nm != NULL, "invalid nmethod_pc"); | |
1006 RelocIterator oops(nm, copy_buff, copy_buff + 1); | |
1007 bool found = false; | |
1008 while (oops.next() && !found) { | |
1009 if (oops.type() == relocInfo::oop_type) { | |
1010 oop_Relocation* r = oops.oop_reloc(); | |
1011 oop* oop_adr = r->oop_addr(); | |
1012 *oop_adr = load_klass(); | |
1013 r->fix_oop_relocation(); | |
1014 found = true; | |
1015 } | |
1016 } | |
1017 assert(found, "the oop must exist!"); | |
1018 #endif | |
1019 | |
1020 } | |
1021 } else { | |
1022 ShouldNotReachHere(); | |
1023 } | |
1024 if (do_patch) { | |
1025 // replace instructions | |
1026 // first replace the tail, then the call | |
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1027 #ifdef ARM |
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1028 if(stub_id == Runtime1::load_klass_patching_id && !VM_Version::supports_movw()) { |
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1029 nmethod* nm = CodeCache::find_nmethod(instr_pc); |
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1030 oop* oop_addr = NULL; |
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1031 assert(nm != NULL, "invalid nmethod_pc"); |
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1032 RelocIterator oops(nm, copy_buff, copy_buff + 1); |
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1033 while (oops.next()) { |
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1034 if (oops.type() == relocInfo::oop_type) { |
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1035 oop_Relocation* r = oops.oop_reloc(); |
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1036 oop_addr = r->oop_addr(); |
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1037 break; |
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1038 } |
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1039 } |
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1040 assert(oop_addr != NULL, "oop relocation must exist"); |
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1041 copy_buff -= *byte_count; |
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1042 NativeMovConstReg* n_copy2 = nativeMovConstReg_at(copy_buff); |
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1043 n_copy2->set_pc_relative_offset((address)oop_addr, instr_pc); |
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1044 } |
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1045 #endif |
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1046 |
0 | 1047 for (int i = NativeCall::instruction_size; i < *byte_count; i++) { |
1048 address ptr = copy_buff + i; | |
1049 int a_byte = (*ptr) & 0xFF; | |
1050 address dst = instr_pc + i; | |
1051 *(unsigned char*)dst = (unsigned char) a_byte; | |
1052 } | |
1053 ICache::invalidate_range(instr_pc, *byte_count); | |
1054 NativeGeneralJump::replace_mt_safe(instr_pc, copy_buff); | |
1055 | |
1056 if (stub_id == Runtime1::load_klass_patching_id) { | |
1057 // update relocInfo to oop | |
1058 nmethod* nm = CodeCache::find_nmethod(instr_pc); | |
1059 assert(nm != NULL, "invalid nmethod_pc"); | |
1060 | |
1061 // The old patch site is now a move instruction so update | |
1062 // the reloc info so that it will get updated during | |
1063 // future GCs. | |
1064 RelocIterator iter(nm, (address)instr_pc, (address)(instr_pc + 1)); | |
1065 relocInfo::change_reloc_info_for_address(&iter, (address) instr_pc, | |
1066 relocInfo::none, relocInfo::oop_type); | |
1067 #ifdef SPARC | |
1068 // Sparc takes two relocations for an oop so update the second one. | |
1069 address instr_pc2 = instr_pc + NativeMovConstReg::add_offset; | |
1070 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1); | |
1071 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2, | |
1072 relocInfo::none, relocInfo::oop_type); | |
1073 #endif | |
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1074 #ifdef PPC |
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1075 { address instr_pc2 = instr_pc + NativeMovConstReg::lo_offset; |
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1076 RelocIterator iter2(nm, instr_pc2, instr_pc2 + 1); |
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1077 relocInfo::change_reloc_info_for_address(&iter2, (address) instr_pc2, relocInfo::none, relocInfo::oop_type); |
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1078 } |
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1079 #endif |
0 | 1080 } |
1081 | |
1082 } else { | |
1083 ICache::invalidate_range(copy_buff, *byte_count); | |
1084 NativeGeneralJump::insert_unconditional(instr_pc, being_initialized_entry); | |
1085 } | |
1086 } | |
1087 } | |
1088 } | |
1089 JRT_END | |
1090 | |
1091 // | |
1092 // Entry point for compiled code. We want to patch a nmethod. | |
1093 // We don't do a normal VM transition here because we want to | |
1094 // know after the patching is complete and any safepoint(s) are taken | |
1095 // if the calling nmethod was deoptimized. We do this by calling a | |
1096 // helper method which does the normal VM transition and when it | |
1097 // completes we can check for deoptimization. This simplifies the | |
1098 // assembly code in the cpu directories. | |
1099 // | |
1100 int Runtime1::move_klass_patching(JavaThread* thread) { | |
1101 // | |
1102 // NOTE: we are still in Java | |
1103 // | |
1104 Thread* THREAD = thread; | |
1105 debug_only(NoHandleMark nhm;) | |
1106 { | |
1107 // Enter VM mode | |
1108 | |
1109 ResetNoHandleMark rnhm; | |
1110 patch_code(thread, load_klass_patching_id); | |
1111 } | |
1112 // Back in JAVA, use no oops DON'T safepoint | |
1113 | |
1114 // Return true if calling code is deoptimized | |
1115 | |
1116 return caller_is_deopted(); | |
1117 } | |
1118 | |
1119 // | |
1120 // Entry point for compiled code. We want to patch a nmethod. | |
1121 // We don't do a normal VM transition here because we want to | |
1122 // know after the patching is complete and any safepoint(s) are taken | |
1123 // if the calling nmethod was deoptimized. We do this by calling a | |
1124 // helper method which does the normal VM transition and when it | |
1125 // completes we can check for deoptimization. This simplifies the | |
1126 // assembly code in the cpu directories. | |
1127 // | |
1128 | |
1129 int Runtime1::access_field_patching(JavaThread* thread) { | |
1130 // | |
1131 // NOTE: we are still in Java | |
1132 // | |
1133 Thread* THREAD = thread; | |
1134 debug_only(NoHandleMark nhm;) | |
1135 { | |
1136 // Enter VM mode | |
1137 | |
1138 ResetNoHandleMark rnhm; | |
1139 patch_code(thread, access_field_patching_id); | |
1140 } | |
1141 // Back in JAVA, use no oops DON'T safepoint | |
1142 | |
1143 // Return true if calling code is deoptimized | |
1144 | |
1145 return caller_is_deopted(); | |
1146 JRT_END | |
1147 | |
1148 | |
1149 JRT_LEAF(void, Runtime1::trace_block_entry(jint block_id)) | |
1150 // for now we just print out the block id | |
1151 tty->print("%d ", block_id); | |
1152 JRT_END | |
1153 | |
1154 | |
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1155 // Array copy return codes. |
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1156 enum { |
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1157 ac_failed = -1, // arraycopy failed |
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1158 ac_ok = 0 // arraycopy succeeded |
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1159 }; |
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1160 |
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1161 |
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1162 // Below length is the # elements copied. |
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1163 template <class T> int obj_arraycopy_work(oopDesc* src, T* src_addr, |
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1164 oopDesc* dst, T* dst_addr, |
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1165 int length) { |
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1166 |
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1167 // For performance reasons, we assume we are using a card marking write |
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1168 // barrier. The assert will fail if this is not the case. |
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1169 // Note that we use the non-virtual inlineable variant of write_ref_array. |
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1170 BarrierSet* bs = Universe::heap()->barrier_set(); |
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1171 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt"); |
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1172 assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well."); |
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1173 if (src == dst) { |
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1174 // same object, no check |
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1175 bs->write_ref_array_pre(dst_addr, length); |
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1176 Copy::conjoint_oops_atomic(src_addr, dst_addr, length); |
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1177 bs->write_ref_array((HeapWord*)dst_addr, length); |
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1178 return ac_ok; |
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1179 } else { |
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1180 klassOop bound = objArrayKlass::cast(dst->klass())->element_klass(); |
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1181 klassOop stype = objArrayKlass::cast(src->klass())->element_klass(); |
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1182 if (stype == bound || Klass::cast(stype)->is_subtype_of(bound)) { |
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1183 // Elements are guaranteed to be subtypes, so no check necessary |
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1184 bs->write_ref_array_pre(dst_addr, length); |
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1185 Copy::conjoint_oops_atomic(src_addr, dst_addr, length); |
1245
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1186 bs->write_ref_array((HeapWord*)dst_addr, length); |
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1187 return ac_ok; |
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1188 } |
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1189 } |
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1190 return ac_failed; |
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1191 } |
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1192 |
0 | 1193 // fast and direct copy of arrays; returning -1, means that an exception may be thrown |
1194 // and we did not copy anything | |
1195 JRT_LEAF(int, Runtime1::arraycopy(oopDesc* src, int src_pos, oopDesc* dst, int dst_pos, int length)) | |
1196 #ifndef PRODUCT | |
1197 _generic_arraycopy_cnt++; // Slow-path oop array copy | |
1198 #endif | |
1199 | |
1200 if (src == NULL || dst == NULL || src_pos < 0 || dst_pos < 0 || length < 0) return ac_failed; | |
1201 if (!dst->is_array() || !src->is_array()) return ac_failed; | |
1202 if ((unsigned int) arrayOop(src)->length() < (unsigned int)src_pos + (unsigned int)length) return ac_failed; | |
1203 if ((unsigned int) arrayOop(dst)->length() < (unsigned int)dst_pos + (unsigned int)length) return ac_failed; | |
1204 | |
1205 if (length == 0) return ac_ok; | |
1206 if (src->is_typeArray()) { | |
1207 const klassOop klass_oop = src->klass(); | |
1208 if (klass_oop != dst->klass()) return ac_failed; | |
1209 typeArrayKlass* klass = typeArrayKlass::cast(klass_oop); | |
1210 const int l2es = klass->log2_element_size(); | |
1211 const int ihs = klass->array_header_in_bytes() / wordSize; | |
1212 char* src_addr = (char*) ((oopDesc**)src + ihs) + (src_pos << l2es); | |
1213 char* dst_addr = (char*) ((oopDesc**)dst + ihs) + (dst_pos << l2es); | |
1214 // Potential problem: memmove is not guaranteed to be word atomic | |
1215 // Revisit in Merlin | |
1216 memmove(dst_addr, src_addr, length << l2es); | |
1217 return ac_ok; | |
1218 } else if (src->is_objArray() && dst->is_objArray()) { | |
2002 | 1219 if (UseCompressedOops) { |
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1220 narrowOop *src_addr = objArrayOop(src)->obj_at_addr<narrowOop>(src_pos); |
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1221 narrowOop *dst_addr = objArrayOop(dst)->obj_at_addr<narrowOop>(dst_pos); |
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1222 return obj_arraycopy_work(src, src_addr, dst, dst_addr, length); |
0 | 1223 } else { |
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1224 oop *src_addr = objArrayOop(src)->obj_at_addr<oop>(src_pos); |
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1225 oop *dst_addr = objArrayOop(dst)->obj_at_addr<oop>(dst_pos); |
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1226 return obj_arraycopy_work(src, src_addr, dst, dst_addr, length); |
0 | 1227 } |
1228 } | |
1229 return ac_failed; | |
1230 JRT_END | |
1231 | |
1232 | |
1233 JRT_LEAF(void, Runtime1::primitive_arraycopy(HeapWord* src, HeapWord* dst, int length)) | |
1234 #ifndef PRODUCT | |
1235 _primitive_arraycopy_cnt++; | |
1236 #endif | |
1237 | |
1238 if (length == 0) return; | |
1239 // Not guaranteed to be word atomic, but that doesn't matter | |
1240 // for anything but an oop array, which is covered by oop_arraycopy. | |
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1241 Copy::conjoint_jbytes(src, dst, length); |
0 | 1242 JRT_END |
1243 | |
1244 JRT_LEAF(void, Runtime1::oop_arraycopy(HeapWord* src, HeapWord* dst, int num)) | |
1245 #ifndef PRODUCT | |
1246 _oop_arraycopy_cnt++; | |
1247 #endif | |
1248 | |
1249 if (num == 0) return; | |
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1250 BarrierSet* bs = Universe::heap()->barrier_set(); |
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1251 assert(bs->has_write_ref_array_opt(), "Barrier set must have ref array opt"); |
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1252 assert(bs->has_write_ref_array_pre_opt(), "For pre-barrier as well."); |
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1253 if (UseCompressedOops) { |
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1254 bs->write_ref_array_pre((narrowOop*)dst, num); |
2002 | 1255 Copy::conjoint_oops_atomic((narrowOop*) src, (narrowOop*) dst, num); |
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1256 } else { |
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1257 bs->write_ref_array_pre((oop*)dst, num); |
2002 | 1258 Copy::conjoint_oops_atomic((oop*) src, (oop*) dst, num); |
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1259 } |
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1260 bs->write_ref_array(dst, num); |
0 | 1261 JRT_END |
1262 | |
1263 | |
1264 #ifndef PRODUCT | |
1265 void Runtime1::print_statistics() { | |
1266 tty->print_cr("C1 Runtime statistics:"); | |
1267 tty->print_cr(" _resolve_invoke_virtual_cnt: %d", SharedRuntime::_resolve_virtual_ctr); | |
1268 tty->print_cr(" _resolve_invoke_opt_virtual_cnt: %d", SharedRuntime::_resolve_opt_virtual_ctr); | |
1269 tty->print_cr(" _resolve_invoke_static_cnt: %d", SharedRuntime::_resolve_static_ctr); | |
1270 tty->print_cr(" _handle_wrong_method_cnt: %d", SharedRuntime::_wrong_method_ctr); | |
1271 tty->print_cr(" _ic_miss_cnt: %d", SharedRuntime::_ic_miss_ctr); | |
1272 tty->print_cr(" _generic_arraycopy_cnt: %d", _generic_arraycopy_cnt); | |
2446 | 1273 tty->print_cr(" _generic_arraycopystub_cnt: %d", _generic_arraycopystub_cnt); |
1274 tty->print_cr(" _byte_arraycopy_cnt: %d", _byte_arraycopy_cnt); | |
1275 tty->print_cr(" _short_arraycopy_cnt: %d", _short_arraycopy_cnt); | |
1276 tty->print_cr(" _int_arraycopy_cnt: %d", _int_arraycopy_cnt); | |
1277 tty->print_cr(" _long_arraycopy_cnt: %d", _long_arraycopy_cnt); | |
0 | 1278 tty->print_cr(" _primitive_arraycopy_cnt: %d", _primitive_arraycopy_cnt); |
2446 | 1279 tty->print_cr(" _oop_arraycopy_cnt (C): %d", Runtime1::_oop_arraycopy_cnt); |
1280 tty->print_cr(" _oop_arraycopy_cnt (stub): %d", _oop_arraycopy_cnt); | |
0 | 1281 tty->print_cr(" _arraycopy_slowcase_cnt: %d", _arraycopy_slowcase_cnt); |
2446 | 1282 tty->print_cr(" _arraycopy_checkcast_cnt: %d", _arraycopy_checkcast_cnt); |
1283 tty->print_cr(" _arraycopy_checkcast_attempt_cnt:%d", _arraycopy_checkcast_attempt_cnt); | |
0 | 1284 |
1285 tty->print_cr(" _new_type_array_slowcase_cnt: %d", _new_type_array_slowcase_cnt); | |
1286 tty->print_cr(" _new_object_array_slowcase_cnt: %d", _new_object_array_slowcase_cnt); | |
1287 tty->print_cr(" _new_instance_slowcase_cnt: %d", _new_instance_slowcase_cnt); | |
1288 tty->print_cr(" _new_multi_array_slowcase_cnt: %d", _new_multi_array_slowcase_cnt); | |
1289 tty->print_cr(" _monitorenter_slowcase_cnt: %d", _monitorenter_slowcase_cnt); | |
1290 tty->print_cr(" _monitorexit_slowcase_cnt: %d", _monitorexit_slowcase_cnt); | |
1291 tty->print_cr(" _patch_code_slowcase_cnt: %d", _patch_code_slowcase_cnt); | |
1292 | |
1293 tty->print_cr(" _throw_range_check_exception_count: %d:", _throw_range_check_exception_count); | |
1294 tty->print_cr(" _throw_index_exception_count: %d:", _throw_index_exception_count); | |
1295 tty->print_cr(" _throw_div0_exception_count: %d:", _throw_div0_exception_count); | |
1296 tty->print_cr(" _throw_null_pointer_exception_count: %d:", _throw_null_pointer_exception_count); | |
1297 tty->print_cr(" _throw_class_cast_exception_count: %d:", _throw_class_cast_exception_count); | |
1298 tty->print_cr(" _throw_incompatible_class_change_error_count: %d:", _throw_incompatible_class_change_error_count); | |
1299 tty->print_cr(" _throw_array_store_exception_count: %d:", _throw_array_store_exception_count); | |
1300 tty->print_cr(" _throw_count: %d:", _throw_count); | |
1301 | |
1302 SharedRuntime::print_ic_miss_histogram(); | |
1303 tty->cr(); | |
1304 } | |
1305 #endif // PRODUCT |