1 #ifdef USE_PRAGMA_IDENT_SRC
2 #pragma ident "@(#)c1_CodeStubs_x86.cpp 1.101 07/09/17 09:25:57 JVM"
3 #endif
4 /*
5 * Copyright 1999-2006 Sun Microsystems, Inc. All Rights Reserved.
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
7 *
8 * This code is free software; you can redistribute it and/or modify it
9 * under the terms of the GNU General Public License version 2 only, as
10 * published by the Free Software Foundation.
11 *
12 * This code is distributed in the hope that it will be useful, but WITHOUT
13 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
14 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
15 * version 2 for more details (a copy is included in the LICENSE file that
16 * accompanied this code).
17 *
18 * You should have received a copy of the GNU General Public License version
19 * 2 along with this work; if not, write to the Free Software Foundation,
20 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
21 *
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
24 * have any questions.
25 *
26 */
27
28 #include "incls/_precompiled.incl"
29 #include "incls/_c1_CodeStubs_x86.cpp.incl"
30
31
32 #define __ ce->masm()->
33
34 float ConversionStub::float_zero = 0.0;
35 double ConversionStub::double_zero = 0.0;
36
37 void ConversionStub::emit_code(LIR_Assembler* ce) {
38 __ bind(_entry);
39 assert(bytecode() == Bytecodes::_f2i || bytecode() == Bytecodes::_d2i, "other conversions do not require stub");
40
41
42 if (input()->is_single_xmm()) {
43 __ comiss(input()->as_xmm_float_reg(),
44 ExternalAddress((address)&float_zero));
45 } else if (input()->is_double_xmm()) {
46 __ comisd(input()->as_xmm_double_reg(),
47 ExternalAddress((address)&double_zero));
48 } else {
49 __ pushl(rax);
50 __ ftst();
51 __ fnstsw_ax();
52 __ sahf();
53 __ popl(rax);
54 }
55
56 Label NaN, do_return;
57 __ jccb(Assembler::parity, NaN);
58 __ jccb(Assembler::below, do_return);
59
60 // input is > 0 -> return maxInt
61 // result register already contains 0x80000000, so subtracting 1 gives 0x7fffffff
62 __ decrement(result()->as_register());
63 __ jmpb(do_return);
64
65 // input is NaN -> return 0
66 __ bind(NaN);
67 __ xorl(result()->as_register(), result()->as_register());
68
69 __ bind(do_return);
70 __ jmp(_continuation);
71 }
72
73 #ifdef TIERED
74 void CounterOverflowStub::emit_code(LIR_Assembler* ce) {
75 __ bind(_entry);
76 ce->store_parameter(_bci, 0);
77 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::counter_overflow_id)));
78 ce->add_call_info_here(_info);
79 ce->verify_oop_map(_info);
80
81 __ jmp(_continuation);
82 }
83 #endif // TIERED
84
85
86
87 RangeCheckStub::RangeCheckStub(CodeEmitInfo* info, LIR_Opr index,
88 bool throw_index_out_of_bounds_exception)
89 : _throw_index_out_of_bounds_exception(throw_index_out_of_bounds_exception)
90 , _index(index)
91 {
92 _info = info == NULL ? NULL : new CodeEmitInfo(info);
93 }
94
95
96 void RangeCheckStub::emit_code(LIR_Assembler* ce) {
97 __ bind(_entry);
98 // pass the array index on stack because all registers must be preserved
99 if (_index->is_cpu_register()) {
100 ce->store_parameter(_index->as_register(), 0);
101 } else {
102 ce->store_parameter(_index->as_jint(), 0);
103 }
104 Runtime1::StubID stub_id;
105 if (_throw_index_out_of_bounds_exception) {
106 stub_id = Runtime1::throw_index_exception_id;
107 } else {
108 stub_id = Runtime1::throw_range_check_failed_id;
109 }
110 __ call(RuntimeAddress(Runtime1::entry_for(stub_id)));
111 ce->add_call_info_here(_info);
112 debug_only(__ should_not_reach_here());
113 }
114
115
116 void DivByZeroStub::emit_code(LIR_Assembler* ce) {
117 if (_offset != -1) {
118 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
119 }
120 __ bind(_entry);
121 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_div0_exception_id)));
122 ce->add_call_info_here(_info);
123 debug_only(__ should_not_reach_here());
124 }
125
126
127 // Implementation of NewInstanceStub
128
129 NewInstanceStub::NewInstanceStub(LIR_Opr klass_reg, LIR_Opr result, ciInstanceKlass* klass, CodeEmitInfo* info, Runtime1::StubID stub_id) {
130 _result = result;
131 _klass = klass;
132 _klass_reg = klass_reg;
133 _info = new CodeEmitInfo(info);
134 assert(stub_id == Runtime1::new_instance_id ||
135 stub_id == Runtime1::fast_new_instance_id ||
136 stub_id == Runtime1::fast_new_instance_init_check_id,
137 "need new_instance id");
138 _stub_id = stub_id;
139 }
140
141
142 void NewInstanceStub::emit_code(LIR_Assembler* ce) {
143 assert(__ rsp_offset() == 0, "frame size should be fixed");
144 __ bind(_entry);
145 __ movl(rdx, _klass_reg->as_register());
146 __ call(RuntimeAddress(Runtime1::entry_for(_stub_id)));
147 ce->add_call_info_here(_info);
148 ce->verify_oop_map(_info);
149 assert(_result->as_register() == rax, "result must in rax,");
150 __ jmp(_continuation);
151 }
152
153
154 // Implementation of NewTypeArrayStub
155
156 NewTypeArrayStub::NewTypeArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
157 _klass_reg = klass_reg;
158 _length = length;
159 _result = result;
160 _info = new CodeEmitInfo(info);
161 }
162
163
164 void NewTypeArrayStub::emit_code(LIR_Assembler* ce) {
165 assert(__ rsp_offset() == 0, "frame size should be fixed");
166 __ bind(_entry);
167 assert(_length->as_register() == rbx, "length must in rbx,");
168 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
169 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_type_array_id)));
170 ce->add_call_info_here(_info);
171 ce->verify_oop_map(_info);
172 assert(_result->as_register() == rax, "result must in rax,");
173 __ jmp(_continuation);
174 }
175
176
177 // Implementation of NewObjectArrayStub
178
179 NewObjectArrayStub::NewObjectArrayStub(LIR_Opr klass_reg, LIR_Opr length, LIR_Opr result, CodeEmitInfo* info) {
180 _klass_reg = klass_reg;
181 _result = result;
182 _length = length;
183 _info = new CodeEmitInfo(info);
184 }
185
186
187 void NewObjectArrayStub::emit_code(LIR_Assembler* ce) {
188 assert(__ rsp_offset() == 0, "frame size should be fixed");
189 __ bind(_entry);
190 assert(_length->as_register() == rbx, "length must in rbx,");
191 assert(_klass_reg->as_register() == rdx, "klass_reg must in rdx");
192 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::new_object_array_id)));
193 ce->add_call_info_here(_info);
194 ce->verify_oop_map(_info);
195 assert(_result->as_register() == rax, "result must in rax,");
196 __ jmp(_continuation);
197 }
198
199
200 // Implementation of MonitorAccessStubs
201
202 MonitorEnterStub::MonitorEnterStub(LIR_Opr obj_reg, LIR_Opr lock_reg, CodeEmitInfo* info)
203 : MonitorAccessStub(obj_reg, lock_reg)
204 {
205 _info = new CodeEmitInfo(info);
206 }
207
208
209 void MonitorEnterStub::emit_code(LIR_Assembler* ce) {
210 assert(__ rsp_offset() == 0, "frame size should be fixed");
211 __ bind(_entry);
212 ce->store_parameter(_obj_reg->as_register(), 1);
213 ce->store_parameter(_lock_reg->as_register(), 0);
214 Runtime1::StubID enter_id;
215 if (ce->compilation()->has_fpu_code()) {
216 enter_id = Runtime1::monitorenter_id;
217 } else {
218 enter_id = Runtime1::monitorenter_nofpu_id;
219 }
220 __ call(RuntimeAddress(Runtime1::entry_for(enter_id)));
221 ce->add_call_info_here(_info);
222 ce->verify_oop_map(_info);
223 __ jmp(_continuation);
224 }
225
226
227 void MonitorExitStub::emit_code(LIR_Assembler* ce) {
228 __ bind(_entry);
229 if (_compute_lock) {
230 // lock_reg was destroyed by fast unlocking attempt => recompute it
231 ce->monitor_address(_monitor_ix, _lock_reg);
232 }
233 ce->store_parameter(_lock_reg->as_register(), 0);
234 // note: non-blocking leaf routine => no call info needed
235 Runtime1::StubID exit_id;
236 if (ce->compilation()->has_fpu_code()) {
237 exit_id = Runtime1::monitorexit_id;
238 } else {
239 exit_id = Runtime1::monitorexit_nofpu_id;
240 }
241 __ call(RuntimeAddress(Runtime1::entry_for(exit_id)));
242 __ jmp(_continuation);
243 }
244
245
246 // Implementation of patching:
247 // - Copy the code at given offset to an inlined buffer (first the bytes, then the number of bytes)
248 // - Replace original code with a call to the stub
249 // At Runtime:
250 // - call to stub, jump to runtime
251 // - in runtime: preserve all registers (rspecially objects, i.e., source and destination object)
252 // - in runtime: after initializing class, restore original code, reexecute instruction
253
254 int PatchingStub::_patch_info_offset = -NativeGeneralJump::instruction_size;
255
256 void PatchingStub::align_patch_site(MacroAssembler* masm) {
257 // We're patching a 5-7 byte instruction on intel and we need to
258 // make sure that we don't see a piece of the instruction. It
259 // appears mostly impossible on Intel to simply invalidate other
260 // processors caches and since they may do aggressive prefetch it's
261 // very hard to make a guess about what code might be in the icache.
262 // Force the instruction to be double word aligned so that it
263 // doesn't span a cache line.
264 masm->align(round_to(NativeGeneralJump::instruction_size, wordSize));
265 }
266
267 void PatchingStub::emit_code(LIR_Assembler* ce) {
268 assert(NativeCall::instruction_size <= _bytes_to_copy && _bytes_to_copy <= 0xFF, "not enough room for call");
269
270 Label call_patch;
271
272 // static field accesses have special semantics while the class
273 // initializer is being run so we emit a test which can be used to
274 // check that this code is being executed by the initializing
275 // thread.
276 address being_initialized_entry = __ pc();
277 if (CommentedAssembly) {
278 __ block_comment(" patch template");
279 }
280 if (_id == load_klass_id) {
281 // produce a copy of the load klass instruction for use by the being initialized case
282 address start = __ pc();
283 jobject o = NULL;
284 __ movoop(_obj, o);
285 #ifdef ASSERT
286 for (int i = 0; i < _bytes_to_copy; i++) {
287 address ptr = (address)(_pc_start + i);
288 int a_byte = (*ptr) & 0xFF;
289 assert(a_byte == *start++, "should be the same code");
290 }
291 #endif
292 } else {
293 // make a copy the code which is going to be patched.
294 for ( int i = 0; i < _bytes_to_copy; i++) {
295 address ptr = (address)(_pc_start + i);
296 int a_byte = (*ptr) & 0xFF;
297 __ a_byte (a_byte);
298 *ptr = 0x90; // make the site look like a nop
299 }
300 }
301
302 address end_of_patch = __ pc();
303 int bytes_to_skip = 0;
304 if (_id == load_klass_id) {
305 int offset = __ offset();
306 if (CommentedAssembly) {
307 __ block_comment(" being_initialized check");
308 }
309 assert(_obj != noreg, "must be a valid register");
310 Register tmp = rax;
311 if (_obj == tmp) tmp = rbx;
312 __ pushl(tmp);
313 __ get_thread(tmp);
314 __ cmpl(tmp, Address(_obj, instanceKlass::init_thread_offset_in_bytes() + sizeof(klassOopDesc)));
315 __ popl(tmp);
316 __ jcc(Assembler::notEqual, call_patch);
317
318 // access_field patches may execute the patched code before it's
319 // copied back into place so we need to jump back into the main
320 // code of the nmethod to continue execution.
321 __ jmp(_patch_site_continuation);
322
323 // make sure this extra code gets skipped
324 bytes_to_skip += __ offset() - offset;
325 }
326 if (CommentedAssembly) {
327 __ block_comment("patch data encoded as movl");
328 }
329 // Now emit the patch record telling the runtime how to find the
330 // pieces of the patch. We only need 3 bytes but for readability of
331 // the disassembly we make the data look like a movl reg, imm32,
332 // which requires 5 bytes
333 int sizeof_patch_record = 5;
334 bytes_to_skip += sizeof_patch_record;
335
336 // emit the offsets needed to find the code to patch
337 int being_initialized_entry_offset = __ pc() - being_initialized_entry + sizeof_patch_record;
338
339 __ a_byte(0xB8);
340 __ a_byte(0);
341 __ a_byte(being_initialized_entry_offset);
342 __ a_byte(bytes_to_skip);
343 __ a_byte(_bytes_to_copy);
344 address patch_info_pc = __ pc();
345 assert(patch_info_pc - end_of_patch == bytes_to_skip, "incorrect patch info");
346
347 address entry = __ pc();
348 NativeGeneralJump::insert_unconditional((address)_pc_start, entry);
349 address target = NULL;
350 switch (_id) {
351 case access_field_id: target = Runtime1::entry_for(Runtime1::access_field_patching_id); break;
352 case load_klass_id: target = Runtime1::entry_for(Runtime1::load_klass_patching_id); break;
353 default: ShouldNotReachHere();
354 }
355 __ bind(call_patch);
356
357 if (CommentedAssembly) {
358 __ block_comment("patch entry point");
359 }
360 __ call(RuntimeAddress(target));
361 assert(_patch_info_offset == (patch_info_pc - __ pc()), "must not change");
362 ce->add_call_info_here(_info);
363 int jmp_off = __ offset();
364 __ jmp(_patch_site_entry);
365 // Add enough nops so deoptimization can overwrite the jmp above with a call
366 // and not destroy the world.
367 for (int j = __ offset() ; j < jmp_off + 5 ; j++ ) {
368 __ nop();
369 }
370 if (_id == load_klass_id) {
371 CodeSection* cs = __ code_section();
372 RelocIterator iter(cs, (address)_pc_start, (address)(_pc_start + 1));
373 relocInfo::change_reloc_info_for_address(&iter, (address) _pc_start, relocInfo::oop_type, relocInfo::none);
374 }
375 }
376
377
378 void ImplicitNullCheckStub::emit_code(LIR_Assembler* ce) {
379 ce->compilation()->implicit_exception_table()->append(_offset, __ offset());
380 __ bind(_entry);
381 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_null_pointer_exception_id)));
382 ce->add_call_info_here(_info);
383 debug_only(__ should_not_reach_here());
384 }
385
386
387 void SimpleExceptionStub::emit_code(LIR_Assembler* ce) {
388 assert(__ rsp_offset() == 0, "frame size should be fixed");
389
390 __ bind(_entry);
391 // pass the object on stack because all registers must be preserved
392 if (_obj->is_cpu_register()) {
393 ce->store_parameter(_obj->as_register(), 0);
394 }
395 __ call(RuntimeAddress(Runtime1::entry_for(_stub)));
396 ce->add_call_info_here(_info);
397 debug_only(__ should_not_reach_here());
398 }
399
400
401 ArrayStoreExceptionStub::ArrayStoreExceptionStub(CodeEmitInfo* info):
402 _info(info) {
403 }
404
405
406 void ArrayStoreExceptionStub::emit_code(LIR_Assembler* ce) {
407 assert(__ rsp_offset() == 0, "frame size should be fixed");
408 __ bind(_entry);
409 __ call(RuntimeAddress(Runtime1::entry_for(Runtime1::throw_array_store_exception_id)));
410 ce->add_call_info_here(_info);
411 debug_only(__ should_not_reach_here());
412 }
413
414
415 void ArrayCopyStub::emit_code(LIR_Assembler* ce) {
416 //---------------slow case: call to native-----------------
417 __ bind(_entry);
418 // Figure out where the args should go
419 // This should really convert the IntrinsicID to the methodOop and signature
420 // but I don't know how to do that.
421 //
422 VMRegPair args[5];
423 BasicType signature[5] = { T_OBJECT, T_INT, T_OBJECT, T_INT, T_INT};
424 SharedRuntime::java_calling_convention(signature, args, 5, true);
425
426 // push parameters
427 // (src, src_pos, dest, destPos, length)
428 Register r[5];
429 r[0] = src()->as_register();
430 r[1] = src_pos()->as_register();
431 r[2] = dst()->as_register();
432 r[3] = dst_pos()->as_register();
433 r[4] = length()->as_register();
434
435 // next registers will get stored on the stack
436 for (int i = 0; i < 5 ; i++ ) {
437 VMReg r_1 = args[i].first();
438 if (r_1->is_stack()) {
439 int st_off = r_1->reg2stack() * wordSize;
440 __ movl (Address(rsp, st_off), r[i]);
441 } else {
442 assert(r[i] == args[i].first()->as_Register(), "Wrong register for arg ");
443 }
444 }
445
446 ce->align_call(lir_static_call);
447
448 ce->emit_static_call_stub();
449 AddressLiteral resolve(SharedRuntime::get_resolve_static_call_stub(),
450 relocInfo::static_call_type);
451 __ call(resolve);
452 ce->add_call_info_here(info());
453
454 #ifndef PRODUCT
455 __ increment(ExternalAddress((address)&Runtime1::_arraycopy_slowcase_cnt));
456 #endif
457
458 __ jmp(_continuation);
459 }
460
461
462 #undef __