1 /*
2 * Copyright 1999-2008 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 LP64_ONLY(ShouldNotReachHere());
47 __ push(rax);
48 __ ftst();
49 __ fnstsw_ax();
50 __ sahf();
51 __ pop(rax);
52 }
53
54 Label NaN, do_return;
55 __ jccb(Assembler::parity, NaN);
56 __ jccb(Assembler::below, do_return);
57
58 // input is > 0 -> return maxInt
59 // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
60 __ decrement(result()->as_register());
61 __ jmpb(do_return);
62
63 // input is NaN -> return 0
64 __ bind(NaN);
65 __ xorptr(result()->as_register(), result()->as_register());
66
67 __ bind(do_return);
68 __ jmp(_continuation);
69 }
70
71 #ifdef TIERED
72 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
73 __ bind(_entry);
74 ce->store_parameter(_bci, 0);
75 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
76 ce->add_call_info_here(_info);
77 ce->verify_oop_map(_info);
78
79 __ jmp(_continuation);
80 }
81 #endif // TIERED
82
83
84
85 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
86 bool throw_index_out_of_bounds_exception)
87 : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
88 , _index(index)
89 {
90 _info = info == NULL ? NULL : new CodeEmitInfo(info);
91 }
92
93
94 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
95 __ bind(_entry);
96 // pass the array index on stack because all registers must be preserved
97 if (_index->is_cpu_register()) {
98 ce->store_parameter(_index->as_register(), 0);
99 } else {
100 ce->store_parameter(_index->as_jint(), 0);
101 }
102 Runtime1::StubID stub_id;
103 if (_throw_index_out_of_bounds_exception) {
104 stub_id = Runtime1::throw_index_exception_id;
105 } else {
106 stub_id = Runtime1::throw_range_check_failed_id;
107 }
108 __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
109 ce->add_call_info_here(_info);
110 debug_only(__ should_not_reach_here());
111 }
112
113
114 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
115 if (_offset != -1) {
116 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
117 }
118 __ bind(_entry);
119 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
120 ce->add_call_info_here(_info);
121 debug_only(__ should_not_reach_here());
122 }
123
124
125 // Implementation of NewInstanceStub
126
127 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
128 _result = result;
129 _klass = klass;
130 _klass_reg = klass_reg;
131 _info = new CodeEmitInfo(info);
132 assert(stub_id == Runtime1::new_instance_id ||
133 stub_id == Runtime1::fast_new_instance_id ||
134 stub_id == Runtime1::fast_new_instance_init_check_id,
135 "need new_instance id");
136 _stub_id = stub_id;
137 }
138
139
140 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
141 assert(__ rsp_offset() == 0, "frame size should be fixed");
142 __ bind(_entry);
143 __ movptr(rdx, _klass_reg->as_register());
144 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
145 ce->add_call_info_here(_info);
146 ce->verify_oop_map(_info);
147 assert(_result->as_register() == rax, "result must in rax,");
148 __ jmp(_continuation);
149 }
150
151
152 // Implementation of NewTypeArrayStub
153
154 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
155 _klass_reg = klass_reg;
156 _length = length;
157 _result = result;
158 _info = new CodeEmitInfo(info);
159 }
160
161
162 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
163 assert(__ rsp_offset() == 0, "frame size should be fixed");
164 __ bind(_entry);
165 assert(_length->as_register() == rbx, "length must in rbx,");
166 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
167 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
168 ce->add_call_info_here(_info);
169 ce->verify_oop_map(_info);
170 assert(_result->as_register() == rax, "result must in rax,");
171 __ jmp(_continuation);
172 }
173
174
175 // Implementation of NewObjectArrayStub
176
177 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
178 _klass_reg = klass_reg;
179 _result = result;
180 _length = length;
181 _info = new CodeEmitInfo(info);
182 }
183
184
185 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
186 assert(__ rsp_offset() == 0, "frame size should be fixed");
187 __ bind(_entry);
188 assert(_length->as_register() == rbx, "length must in rbx,");
189 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
190 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
191 ce->add_call_info_here(_info);
192 ce->verify_oop_map(_info);
193 assert(_result->as_register() == rax, "result must in rax,");
194 __ jmp(_continuation);
195 }
196
197
198 // Implementation of MonitorAccessStubs
199
200 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
201 : MonitorAccessStub(obj_reg, lock_reg)
202 {
203 _info = new CodeEmitInfo(info);
204 }
205
206
207 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
208 assert(__ rsp_offset() == 0, "frame size should be fixed");
209 __ bind(_entry);
210 ce->store_parameter(_obj_reg->as_register(), 1);
211 ce->store_parameter(_lock_reg->as_register(), 0);
212 Runtime1::StubID enter_id;
213 if (ce->compilation()->has_fpu_code()) {
214 enter_id = Runtime1::monitorenter_id;
215 } else {
216 enter_id = Runtime1::monitorenter_nofpu_id;
217 }
218 __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
219 ce->add_call_info_here(_info);
220 ce->verify_oop_map(_info);
221 __ jmp(_continuation);
222 }
223
224
225 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
226 __ bind(_entry);
227 if (_compute_lock) {
228 // lock_reg was destroyed by fast unlocking attempt => recompute it
229 ce->monitor_address(_monitor_ix, _lock_reg);
230 }
231 ce->store_parameter(_lock_reg->as_register(), 0);
232 // note: non-blocking leaf routine => no call info needed
233 Runtime1::StubID exit_id;
234 if (ce->compilation()->has_fpu_code()) {
235 exit_id = Runtime1::monitorexit_id;
236 } else {
237 exit_id = Runtime1::monitorexit_nofpu_id;
238 }
239 __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
240 __ jmp(_continuation);
241 }
242
243
244 // Implementation of patching:
245 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
246 // - Replace original code with a call to the stub
247 // At Runtime:
248 // - call to stub, jump to runtime
249 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
250 // - in runtime: after initializing class, restore original code, reexecute instruction
251
252 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
253
254 void PatchingStub::align_patch_site(MacroAssembler* masm) {
255 // We're patching a 5-7 byte instruction on intel and we need to
256 // make sure that we don't see a piece of the instruction. It
257 // appears mostly impossible on Intel to simply invalidate other
258 // processors caches and since they may do aggressive prefetch it's
259 // very hard to make a guess about what code might be in the icache.
260 // Force the instruction to be double word aligned so that it
261 // doesn't span a cache line.
262 masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
263 }
264
265 void PatchingStub::emit_code(LIR_Assembler* ce) {
266 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
267
268 Label call_patch;
269
270 // static field accesses have special semantics while the class
271 // initializer is being run so we emit a test which can be used to
272 // check that this code is being executed by the initializing
273 // thread.
274 address being_initialized_entry = __ pc();
275 if (CommentedAssembly) {
276 __ block_comment(" patch template");
277 }
278 if (_id == load_klass_id) {
279 // produce a copy of the load klass instruction for use by the being initialized case
280 address start = __ pc();
281 jobject o = NULL;
282 __ movoop(_obj, o);
283 #ifdef ASSERT
284 for (int i = 0; i < _bytes_to_copy; i++) {
285 address ptr = (address)(_pc_start + i);
286 int a_byte = (*ptr) & 0xFF;
287 assert(a_byte == *start++, "should be the same code");
288 }
289 #endif
290 } else {
291 // make a copy the code which is going to be patched.
292 for ( int i = 0; i < _bytes_to_copy; i++) {
293 address ptr = (address)(_pc_start + i);
294 int a_byte = (*ptr) & 0xFF;
295 __ a_byte (a_byte);
296 *ptr = 0x90; // make the site look like a nop
297 }
298 }
299
300 address end_of_patch = __ pc();
301 int bytes_to_skip = 0;
302 if (_id == load_klass_id) {
303 int offset = __ offset();
304 if (CommentedAssembly) {
305 __ block_comment(" being_initialized check");
306 }
307 assert(_obj != noreg, "must be a valid register");
308 Register tmp = rax;
309 if (_obj == tmp) tmp = rbx;
310 __ push(tmp);
311 __ get_thread(tmp);
312 __ cmpptr(tmp, Address(_obj, instanceKlass::init_thread_offset_in_bytes() + sizeof(klassOopDesc)));
313 __ pop(tmp);
314 __ jcc(Assembler::notEqual, call_patch);
315
316 // access_field patches may execute the patched code before it's
317 // copied back into place so we need to jump back into the main
318 // code of the nmethod to continue execution.
319 __ jmp(_patch_site_continuation);
320
321 // make sure this extra code gets skipped
322 bytes_to_skip += __ offset() - offset;
323 }
324 if (CommentedAssembly) {
325 __ block_comment("patch data encoded as movl");
326 }
327 // Now emit the patch record telling the runtime how to find the
328 // pieces of the patch. We only need 3 bytes but for readability of
329 // the disassembly we make the data look like a movl reg, imm32,
330 // which requires 5 bytes
331 int sizeof_patch_record = 5;
332 bytes_to_skip += sizeof_patch_record;
333
334 // emit the offsets needed to find the code to patch
335 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
336
337 __ a_byte(0xB8);
338 __ a_byte(0);
339 __ a_byte(being_initialized_entry_offset);
340 __ a_byte(bytes_to_skip);
341 __ a_byte(_bytes_to_copy);
342 address patch_info_pc = __ pc();
343 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
344
345 address entry = __ pc();
346 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
347 address target = NULL;
348 switch (_id) {
349 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
350 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); break;
351 default: ShouldNotReachHere();
352 }
353 __ bind(call_patch);
354
355 if (CommentedAssembly) {
356 __ block_comment("patch entry point");
357 }
358 __ call(RuntimeAddress(target));
359 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
360 ce->add_call_info_here(_info);
361 int jmp_off = __ offset();
362 __ jmp(_patch_site_entry);
363 // Add enough nops so deoptimization can overwrite the jmp above with a call
364 // and not destroy the world.
365 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
366 __ nop();
367 }
368 if (_id == load_klass_id) {
369 CodeSection* cs = __ code_section();
370 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
371 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, relocInfo::oop_type, relocInfo::none);
372 }
373 }
374
375
376 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
377 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
378 __ bind(_entry);
379 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id)));
380 ce->add_call_info_here(_info);
381 debug_only(__ should_not_reach_here());
382 }
383
384
385 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
386 assert(__ rsp_offset() == 0, "frame size should be fixed");
387
388 __ bind(_entry);
389 // pass the object on stack because all registers must be preserved
390 if (_obj->is_cpu_register()) {
391 ce->store_parameter(_obj->as_register(), 0);
392 }
393 __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
394 ce->add_call_info_here(_info);
395 debug_only(__ should_not_reach_here());
396 }
397
398
399 ArrayStoreExceptionStub::ArrayStoreExceptionStub(CodeEmitInfo* info):
400 _info(info) {
401 }
402
403
404 void ArrayStoreExceptionStub::emit_code(LIR_Assembler* ce) {
405 assert(__ rsp_offset() == 0, "frame size should be fixed");
406 __ bind(_entry);
407 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_array_store_exception_id)));
408 ce->add_call_info_here(_info);
409 debug_only(__ should_not_reach_here());
410 }
411
412
413 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
414 //---------------slow case: call to native-----------------
415 __ bind(_entry);
416 // Figure out where the args should go
417 // This should really convert the IntrinsicID to the methodOop and signature
418 // but I don't know how to do that.
419 //
420 VMRegPair args[5];
421 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
422 SharedRuntime::java_calling_convention(signature, args, 5, true);
423
424 // push parameters
425 // (src, src_pos, dest, destPos, length)
426 Register r[5];
427 r[0] = src()->as_register();
428 r[1] = src_pos()->as_register();
429 r[2] = dst()->as_register();
430 r[3] = dst_pos()->as_register();
431 r[4] = length()->as_register();
432
433 // next registers will get stored on the stack
434 for (int i = 0; i < 5 ; i++ ) {
435 VMReg r_1 = args[i].first();
436 if (r_1->is_stack()) {
437 int st_off = r_1->reg2stack() * wordSize;
438 __ movptr (Address(rsp, st_off), r[i]);
439 } else {
440 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
441 }
442 }
443
444 ce->align_call(lir_static_call);
445
446 ce->emit_static_call_stub();
447 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
448 relocInfo::static_call_type);
449 __ call(resolve);
450 ce->add_call_info_here(info());
451
452 #ifndef PRODUCT
453 __ incrementl(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
454 #endif
455
456 __ jmp(_continuation);
457 }
458
459 /////////////////////////////////////////////////////////////////////////////
460 #ifndef SERIALGC
461
462 void G1PreBarrierStub::emit_code(LIR_Assembler* ce) {
463
464 // At this point we know that marking is in progress
465
466 __ bind(_entry);
467 assert(pre_val()->is_register(), "Precondition.");
468
469 Register pre_val_reg = pre_val()->as_register();
470
471 ce->mem2reg(addr(), pre_val(), T_OBJECT, patch_code(), info(), false);
472
473 __ cmpptr(pre_val_reg, (int32_t) NULL_WORD);
474 __ jcc(Assembler::equal, _continuation);
475 ce->store_parameter(pre_val()->as_register(), 0);
476 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_pre_barrier_slow_id)));
477 __ jmp(_continuation);
478
479 }
480
481 jbyte* G1PostBarrierStub::_byte_map_base = NULL;
482
483 jbyte* G1PostBarrierStub::byte_map_base_slow() {
484 BarrierSet* bs = Universe::heap()->barrier_set();
485 assert(bs->is_a(BarrierSet::G1SATBCTLogging),
486 "Must be if we're using this.");
487 return ((G1SATBCardTableModRefBS*)bs)->byte_map_base;
488 }
489
490 void G1PostBarrierStub::emit_code(LIR_Assembler* ce) {
491 __ bind(_entry);
492 assert(addr()->is_register(), "Precondition.");
493 assert(new_val()->is_register(), "Precondition.");
494 Register new_val_reg = new_val()->as_register();
495 __ cmpptr(new_val_reg, (int32_t) NULL_WORD);
496 __ jcc(Assembler::equal, _continuation);
497 ce->store_parameter(addr()->as_register(), 0);
498 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::g1_post_barrier_slow_id)));
499 __ jmp(_continuation);
500 }
501
502 #endif // SERIALGC
503 /////////////////////////////////////////////////////////////////////////////
504
505 #undef __