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comparison src/cpu/x86/vm/c1_CodeStubs_x86.cpp @ 0:a61af66fc99e jdk7-b24

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author duke
date Sat, 01 Dec 2007 00:00:00 +0000
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children dc7f315e41f7 37f87013dfd8
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-1:000000000000 0:a61af66fc99e
1 /*
2 * Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
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/_c1_CodeStubs_x86.cpp.incl"
27
28
29 #define __ ce->masm()->
30
31 float ConversionStub::float_zero = 0.0;
32 double ConversionStub::double_zero = 0.0;
33
34 void ConversionStub::emit_code(LIR_Assembler* ce) {
35 __ bind(_entry);
36 assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
37
38
39 if (input()->is_single_xmm()) {
40 __ comiss(input()->as_xmm_float_reg(),
41 ExternalAddress((address)&float_zero));
42 } else if (input()->is_double_xmm()) {
43 __ comisd(input()->as_xmm_double_reg(),
44 ExternalAddress((address)&double_zero));
45 } else {
46 __ pushl(rax);
47 __ ftst();
48 __ fnstsw_ax();
49 __ sahf();
50 __ popl(rax);
51 }
52
53 Label NaN, do_return;
54 __ jccb(Assembler::parity, NaN);
55 __ jccb(Assembler::below, do_return);
56
57 // input is > 0 -> return maxInt
58 // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
59 __ decrement(result()->as_register());
60 __ jmpb(do_return);
61
62 // input is NaN -> return 0
63 __ bind(NaN);
64 __ xorl(result()->as_register(), result()->as_register());
65
66 __ bind(do_return);
67 __ jmp(_continuation);
68 }
69
70 #ifdef TIERED
71 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
72 __ bind(_entry);
73 ce->store_parameter(_bci, 0);
74 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
75 ce->add_call_info_here(_info);
76 ce->verify_oop_map(_info);
77
78 __ jmp(_continuation);
79 }
80 #endif // TIERED
81
82
83
84 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
85 bool throw_index_out_of_bounds_exception)
86 : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
87 , _index(index)
88 {
89 _info = info == NULL ? NULL : new CodeEmitInfo(info);
90 }
91
92
93 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
94 __ bind(_entry);
95 // pass the array index on stack because all registers must be preserved
96 if (_index->is_cpu_register()) {
97 ce->store_parameter(_index->as_register(), 0);
98 } else {
99 ce->store_parameter(_index->as_jint(), 0);
100 }
101 Runtime1::StubID stub_id;
102 if (_throw_index_out_of_bounds_exception) {
103 stub_id = Runtime1::throw_index_exception_id;
104 } else {
105 stub_id = Runtime1::throw_range_check_failed_id;
106 }
107 __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
108 ce->add_call_info_here(_info);
109 debug_only(__ should_not_reach_here());
110 }
111
112
113 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
114 if (_offset != -1) {
115 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
116 }
117 __ bind(_entry);
118 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
119 ce->add_call_info_here(_info);
120 debug_only(__ should_not_reach_here());
121 }
122
123
124 // Implementation of NewInstanceStub
125
126 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
127 _result = result;
128 _klass = klass;
129 _klass_reg = klass_reg;
130 _info = new CodeEmitInfo(info);
131 assert(stub_id == Runtime1::new_instance_id ||
132 stub_id == Runtime1::fast_new_instance_id ||
133 stub_id == Runtime1::fast_new_instance_init_check_id,
134 "need new_instance id");
135 _stub_id = stub_id;
136 }
137
138
139 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
140 assert(__ rsp_offset() == 0, "frame size should be fixed");
141 __ bind(_entry);
142 __ movl(rdx, _klass_reg->as_register());
143 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
144 ce->add_call_info_here(_info);
145 ce->verify_oop_map(_info);
146 assert(_result->as_register() == rax, "result must in rax,");
147 __ jmp(_continuation);
148 }
149
150
151 // Implementation of NewTypeArrayStub
152
153 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
154 _klass_reg = klass_reg;
155 _length = length;
156 _result = result;
157 _info = new CodeEmitInfo(info);
158 }
159
160
161 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
162 assert(__ rsp_offset() == 0, "frame size should be fixed");
163 __ bind(_entry);
164 assert(_length->as_register() == rbx, "length must in rbx,");
165 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
166 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
167 ce->add_call_info_here(_info);
168 ce->verify_oop_map(_info);
169 assert(_result->as_register() == rax, "result must in rax,");
170 __ jmp(_continuation);
171 }
172
173
174 // Implementation of NewObjectArrayStub
175
176 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
177 _klass_reg = klass_reg;
178 _result = result;
179 _length = length;
180 _info = new CodeEmitInfo(info);
181 }
182
183
184 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
185 assert(__ rsp_offset() == 0, "frame size should be fixed");
186 __ bind(_entry);
187 assert(_length->as_register() == rbx, "length must in rbx,");
188 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
189 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
190 ce->add_call_info_here(_info);
191 ce->verify_oop_map(_info);
192 assert(_result->as_register() == rax, "result must in rax,");
193 __ jmp(_continuation);
194 }
195
196
197 // Implementation of MonitorAccessStubs
198
199 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
200 : MonitorAccessStub(obj_reg, lock_reg)
201 {
202 _info = new CodeEmitInfo(info);
203 }
204
205
206 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
207 assert(__ rsp_offset() == 0, "frame size should be fixed");
208 __ bind(_entry);
209 ce->store_parameter(_obj_reg->as_register(), 1);
210 ce->store_parameter(_lock_reg->as_register(), 0);
211 Runtime1::StubID enter_id;
212 if (ce->compilation()->has_fpu_code()) {
213 enter_id = Runtime1::monitorenter_id;
214 } else {
215 enter_id = Runtime1::monitorenter_nofpu_id;
216 }
217 __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
218 ce->add_call_info_here(_info);
219 ce->verify_oop_map(_info);
220 __ jmp(_continuation);
221 }
222
223
224 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
225 __ bind(_entry);
226 if (_compute_lock) {
227 // lock_reg was destroyed by fast unlocking attempt => recompute it
228 ce->monitor_address(_monitor_ix, _lock_reg);
229 }
230 ce->store_parameter(_lock_reg->as_register(), 0);
231 // note: non-blocking leaf routine => no call info needed
232 Runtime1::StubID exit_id;
233 if (ce->compilation()->has_fpu_code()) {
234 exit_id = Runtime1::monitorexit_id;
235 } else {
236 exit_id = Runtime1::monitorexit_nofpu_id;
237 }
238 __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
239 __ jmp(_continuation);
240 }
241
242
243 // Implementation of patching:
244 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
245 // - Replace original code with a call to the stub
246 // At Runtime:
247 // - call to stub, jump to runtime
248 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
249 // - in runtime: after initializing class, restore original code, reexecute instruction
250
251 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
252
253 void PatchingStub::align_patch_site(MacroAssembler* masm) {
254 // We're patching a 5-7 byte instruction on intel and we need to
255 // make sure that we don't see a piece of the instruction. It
256 // appears mostly impossible on Intel to simply invalidate other
257 // processors caches and since they may do aggressive prefetch it's
258 // very hard to make a guess about what code might be in the icache.
259 // Force the instruction to be double word aligned so that it
260 // doesn't span a cache line.
261 masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
262 }
263
264 void PatchingStub::emit_code(LIR_Assembler* ce) {
265 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
266
267 Label call_patch;
268
269 // static field accesses have special semantics while the class
270 // initializer is being run so we emit a test which can be used to
271 // check that this code is being executed by the initializing
272 // thread.
273 address being_initialized_entry = __ pc();
274 if (CommentedAssembly) {
275 __ block_comment(" patch template");
276 }
277 if (_id == load_klass_id) {
278 // produce a copy of the load klass instruction for use by the being initialized case
279 address start = __ pc();
280 jobject o = NULL;
281 __ movoop(_obj, o);
282 #ifdef ASSERT
283 for (int i = 0; i < _bytes_to_copy; i++) {
284 address ptr = (address)(_pc_start + i);
285 int a_byte = (*ptr) & 0xFF;
286 assert(a_byte == *start++, "should be the same code");
287 }
288 #endif
289 } else {
290 // make a copy the code which is going to be patched.
291 for ( int i = 0; i < _bytes_to_copy; i++) {
292 address ptr = (address)(_pc_start + i);
293 int a_byte = (*ptr) & 0xFF;
294 __ a_byte (a_byte);
295 *ptr = 0x90; // make the site look like a nop
296 }
297 }
298
299 address end_of_patch = __ pc();
300 int bytes_to_skip = 0;
301 if (_id == load_klass_id) {
302 int offset = __ offset();
303 if (CommentedAssembly) {
304 __ block_comment(" being_initialized check");
305 }
306 assert(_obj != noreg, "must be a valid register");
307 Register tmp = rax;
308 if (_obj == tmp) tmp = rbx;
309 __ pushl(tmp);
310 __ get_thread(tmp);
311 __ cmpl(tmp, Address(_obj, instanceKlass::init_thread_offset_in_bytes() + sizeof(klassOopDesc)));
312 __ popl(tmp);
313 __ jcc(Assembler::notEqual, call_patch);
314
315 // access_field patches may execute the patched code before it's
316 // copied back into place so we need to jump back into the main
317 // code of the nmethod to continue execution.
318 __ jmp(_patch_site_continuation);
319
320 // make sure this extra code gets skipped
321 bytes_to_skip += __ offset() - offset;
322 }
323 if (CommentedAssembly) {
324 __ block_comment("patch data encoded as movl");
325 }
326 // Now emit the patch record telling the runtime how to find the
327 // pieces of the patch. We only need 3 bytes but for readability of
328 // the disassembly we make the data look like a movl reg, imm32,
329 // which requires 5 bytes
330 int sizeof_patch_record = 5;
331 bytes_to_skip += sizeof_patch_record;
332
333 // emit the offsets needed to find the code to patch
334 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
335
336 __ a_byte(0xB8);
337 __ a_byte(0);
338 __ a_byte(being_initialized_entry_offset);
339 __ a_byte(bytes_to_skip);
340 __ a_byte(_bytes_to_copy);
341 address patch_info_pc = __ pc();
342 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
343
344 address entry = __ pc();
345 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
346 address target = NULL;
347 switch (_id) {
348 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
349 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); break;
350 default: ShouldNotReachHere();
351 }
352 __ bind(call_patch);
353
354 if (CommentedAssembly) {
355 __ block_comment("patch entry point");
356 }
357 __ call(RuntimeAddress(target));
358 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
359 ce->add_call_info_here(_info);
360 int jmp_off = __ offset();
361 __ jmp(_patch_site_entry);
362 // Add enough nops so deoptimization can overwrite the jmp above with a call
363 // and not destroy the world.
364 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
365 __ nop();
366 }
367 if (_id == load_klass_id) {
368 CodeSection* cs = __ code_section();
369 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
370 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, relocInfo::oop_type, relocInfo::none);
371 }
372 }
373
374
375 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
376 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
377 __ bind(_entry);
378 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id)));
379 ce->add_call_info_here(_info);
380 debug_only(__ should_not_reach_here());
381 }
382
383
384 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
385 assert(__ rsp_offset() == 0, "frame size should be fixed");
386
387 __ bind(_entry);
388 // pass the object on stack because all registers must be preserved
389 if (_obj->is_cpu_register()) {
390 ce->store_parameter(_obj->as_register(), 0);
391 }
392 __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
393 ce->add_call_info_here(_info);
394 debug_only(__ should_not_reach_here());
395 }
396
397
398 ArrayStoreExceptionStub::ArrayStoreExceptionStub(CodeEmitInfo* info):
399 _info(info) {
400 }
401
402
403 void ArrayStoreExceptionStub::emit_code(LIR_Assembler* ce) {
404 assert(__ rsp_offset() == 0, "frame size should be fixed");
405 __ bind(_entry);
406 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_array_store_exception_id)));
407 ce->add_call_info_here(_info);
408 debug_only(__ should_not_reach_here());
409 }
410
411
412 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
413 //---------------slow case: call to native-----------------
414 __ bind(_entry);
415 // Figure out where the args should go
416 // This should really convert the IntrinsicID to the methodOop and signature
417 // but I don't know how to do that.
418 //
419 VMRegPair args[5];
420 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
421 SharedRuntime::java_calling_convention(signature, args, 5, true);
422
423 // push parameters
424 // (src, src_pos, dest, destPos, length)
425 Register r[5];
426 r[0] = src()->as_register();
427 r[1] = src_pos()->as_register();
428 r[2] = dst()->as_register();
429 r[3] = dst_pos()->as_register();
430 r[4] = length()->as_register();
431
432 // next registers will get stored on the stack
433 for (int i = 0; i < 5 ; i++ ) {
434 VMReg r_1 = args[i].first();
435 if (r_1->is_stack()) {
436 int st_off = r_1->reg2stack() * wordSize;
437 __ movl (Address(rsp, st_off), r[i]);
438 } else {
439 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
440 }
441 }
442
443 ce->align_call(lir_static_call);
444
445 ce->emit_static_call_stub();
446 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
447 relocInfo::static_call_type);
448 __ call(resolve);
449 ce->add_call_info_here(info());
450
451 #ifndef PRODUCT
452 __ increment(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
453 #endif
454
455 __ jmp(_continuation);
456 }
457
458
459 #undef __