-
Notifications
You must be signed in to change notification settings - Fork 1.3k
/
DFGOSRExitCompilerCommon.cpp
451 lines (383 loc) · 22.7 KB
/
DFGOSRExitCompilerCommon.cpp
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
298
299
300
301
302
303
304
305
306
307
308
309
310
311
312
313
314
315
316
317
318
319
320
321
322
323
324
325
326
327
328
329
330
331
332
333
334
335
336
337
338
339
340
341
342
343
344
345
346
347
348
349
350
351
352
353
354
355
356
357
358
359
360
361
362
363
364
365
366
367
368
369
370
371
372
373
374
375
376
377
378
379
380
381
382
383
384
385
386
387
388
389
390
391
392
393
394
395
396
397
398
399
400
401
402
403
404
405
406
407
408
409
410
411
412
413
414
415
416
417
418
419
420
421
422
423
424
425
426
427
428
429
430
431
432
433
434
435
436
437
438
439
440
441
442
443
444
445
446
447
448
449
450
/*
* Copyright (C) 2013-2020 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "DFGOSRExitCompilerCommon.h"
#if ENABLE(DFG_JIT)
#include "DFGJITCode.h"
#include "DFGOperations.h"
#include "JIT.h"
#include "JSCJSValueInlines.h"
#include "LLIntData.h"
#include "LLIntThunks.h"
#include "StructureStubInfo.h"
namespace JSC { namespace DFG {
void handleExitCounts(VM& vm, CCallHelpers& jit, const OSRExitBase& exit)
{
if (!exitKindMayJettison(exit.m_kind)) {
// FIXME: We may want to notice that we're frequently exiting
// at an op_catch that we didn't compile an entrypoint for, and
// then trigger a reoptimization of this CodeBlock:
// https://bugs.webkit.org/show_bug.cgi?id=175842
return;
}
jit.add32(AssemblyHelpers::TrustedImm32(1), AssemblyHelpers::AbsoluteAddress(&exit.m_count));
jit.move(AssemblyHelpers::TrustedImmPtr(jit.codeBlock()), GPRInfo::regT3);
AssemblyHelpers::Jump tooFewFails;
jit.load32(AssemblyHelpers::Address(GPRInfo::regT3, CodeBlock::offsetOfOSRExitCounter()), GPRInfo::regT2);
jit.add32(AssemblyHelpers::TrustedImm32(1), GPRInfo::regT2);
jit.store32(GPRInfo::regT2, AssemblyHelpers::Address(GPRInfo::regT3, CodeBlock::offsetOfOSRExitCounter()));
jit.move(AssemblyHelpers::TrustedImmPtr(jit.baselineCodeBlock()), GPRInfo::regT0);
AssemblyHelpers::Jump reoptimizeNow = jit.branch32(
AssemblyHelpers::GreaterThanOrEqual,
AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter()),
AssemblyHelpers::TrustedImm32(0));
// We want to figure out if there's a possibility that we're in a loop. For the outermost
// code block in the inline stack, we handle this appropriately by having the loop OSR trigger
// check the exit count of the replacement of the CodeBlock from which we are OSRing. The
// problem is the inlined functions, which might also have loops, but whose baseline versions
// don't know where to look for the exit count. Figure out if those loops are severe enough
// that we had tried to OSR enter. If so, then we should use the loop reoptimization trigger.
// Otherwise, we should use the normal reoptimization trigger.
AssemblyHelpers::JumpList loopThreshold;
for (InlineCallFrame* inlineCallFrame = exit.m_codeOrigin.inlineCallFrame(); inlineCallFrame; inlineCallFrame = inlineCallFrame->directCaller.inlineCallFrame()) {
loopThreshold.append(
jit.branchTest8(
AssemblyHelpers::NonZero,
AssemblyHelpers::AbsoluteAddress(
inlineCallFrame->baselineCodeBlock->ownerExecutable()->addressOfDidTryToEnterInLoop())));
}
jit.move(
AssemblyHelpers::TrustedImm32(jit.codeBlock()->exitCountThresholdForReoptimization()),
GPRInfo::regT1);
if (!loopThreshold.empty()) {
AssemblyHelpers::Jump done = jit.jump();
loopThreshold.link(&jit);
jit.move(
AssemblyHelpers::TrustedImm32(
jit.codeBlock()->exitCountThresholdForReoptimizationFromLoop()),
GPRInfo::regT1);
done.link(&jit);
}
tooFewFails = jit.branch32(AssemblyHelpers::BelowOrEqual, GPRInfo::regT2, GPRInfo::regT1);
reoptimizeNow.link(&jit);
jit.setupArguments<decltype(operationTriggerReoptimizationNow)>(GPRInfo::regT0, GPRInfo::regT3, AssemblyHelpers::TrustedImmPtr(&exit));
jit.prepareCallOperation(vm);
jit.move(AssemblyHelpers::TrustedImmPtr(tagCFunction<OperationPtrTag>(operationTriggerReoptimizationNow)), GPRInfo::nonArgGPR0);
jit.call(GPRInfo::nonArgGPR0, OperationPtrTag);
AssemblyHelpers::Jump doneAdjusting = jit.jump();
tooFewFails.link(&jit);
// Adjust the execution counter such that the target is to only optimize after a while.
int32_t activeThreshold =
jit.baselineCodeBlock()->adjustedCounterValue(
Options::thresholdForOptimizeAfterLongWarmUp());
int32_t targetValue = applyMemoryUsageHeuristicsAndConvertToInt(
activeThreshold, jit.baselineCodeBlock());
int32_t clippedValue;
switch (jit.codeBlock()->jitType()) {
case JITType::DFGJIT:
clippedValue = BaselineExecutionCounter::clippedThreshold(jit.codeBlock()->globalObject(), targetValue);
break;
case JITType::FTLJIT:
clippedValue = UpperTierExecutionCounter::clippedThreshold(jit.codeBlock()->globalObject(), targetValue);
break;
default:
RELEASE_ASSERT_NOT_REACHED();
#if COMPILER_QUIRK(CONSIDERS_UNREACHABLE_CODE)
clippedValue = 0; // Make some compilers, and mhahnenberg, happy.
#endif
break;
}
jit.store32(AssemblyHelpers::TrustedImm32(-clippedValue), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecuteCounter()));
jit.store32(AssemblyHelpers::TrustedImm32(activeThreshold), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionActiveThreshold()));
jit.store32(AssemblyHelpers::TrustedImm32(formattedTotalExecutionCount(clippedValue)), AssemblyHelpers::Address(GPRInfo::regT0, CodeBlock::offsetOfJITExecutionTotalCount()));
doneAdjusting.link(&jit);
}
static MacroAssemblerCodePtr<JSEntryPtrTag> callerReturnPC(CodeBlock* baselineCodeBlockForCaller, BytecodeIndex callBytecodeIndex, InlineCallFrame::Kind trueCallerCallKind, bool& callerIsLLInt)
{
callerIsLLInt = Options::forceOSRExitToLLInt() || baselineCodeBlockForCaller->jitType() == JITType::InterpreterThunk;
if (callBytecodeIndex.checkpoint()) {
if (!callerIsLLInt)
baselineCodeBlockForCaller->m_hasLinkedOSRExit = true;
return LLInt::checkpointOSRExitFromInlinedCallTrampolineThunk().code();
}
MacroAssemblerCodePtr<JSEntryPtrTag> jumpTarget;
const Instruction& callInstruction = *baselineCodeBlockForCaller->instructions().at(callBytecodeIndex).ptr();
if (callerIsLLInt) {
#define LLINT_RETURN_LOCATION(name) LLInt::returnLocationThunk(name##_return_location, callInstruction.width()).code()
switch (trueCallerCallKind) {
case InlineCallFrame::Call: {
if (callInstruction.opcodeID() == op_call)
jumpTarget = LLINT_RETURN_LOCATION(op_call);
else if (callInstruction.opcodeID() == op_iterator_open)
jumpTarget = LLINT_RETURN_LOCATION(op_iterator_open);
else if (callInstruction.opcodeID() == op_iterator_next)
jumpTarget = LLINT_RETURN_LOCATION(op_iterator_next);
break;
}
case InlineCallFrame::Construct:
jumpTarget = LLINT_RETURN_LOCATION(op_construct);
break;
case InlineCallFrame::CallVarargs:
jumpTarget = LLINT_RETURN_LOCATION(op_call_varargs_slow);
break;
case InlineCallFrame::ConstructVarargs:
jumpTarget = LLINT_RETURN_LOCATION(op_construct_varargs_slow);
break;
case InlineCallFrame::GetterCall: {
if (callInstruction.opcodeID() == op_get_by_id)
jumpTarget = LLINT_RETURN_LOCATION(op_get_by_id);
else if (callInstruction.opcodeID() == op_get_by_val)
jumpTarget = LLINT_RETURN_LOCATION(op_get_by_val);
else
RELEASE_ASSERT_NOT_REACHED();
break;
}
case InlineCallFrame::SetterCall: {
if (callInstruction.opcodeID() == op_put_by_id)
jumpTarget = LLINT_RETURN_LOCATION(op_put_by_id);
else if (callInstruction.opcodeID() == op_put_by_val)
jumpTarget = LLINT_RETURN_LOCATION(op_put_by_val);
else
RELEASE_ASSERT_NOT_REACHED();
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
}
#undef LLINT_RETURN_LOCATION
} else {
baselineCodeBlockForCaller->m_hasLinkedOSRExit = true;
switch (trueCallerCallKind) {
case InlineCallFrame::Call:
case InlineCallFrame::Construct:
case InlineCallFrame::CallVarargs:
case InlineCallFrame::ConstructVarargs: {
CallLinkInfo* callLinkInfo =
baselineCodeBlockForCaller->getCallLinkInfoForBytecodeIndex(callBytecodeIndex);
RELEASE_ASSERT(callLinkInfo);
jumpTarget = callLinkInfo->callReturnLocation().retagged<JSEntryPtrTag>();
break;
}
case InlineCallFrame::GetterCall:
case InlineCallFrame::SetterCall: {
if (callInstruction.opcodeID() == op_put_by_val) {
// We compile op_put_by_val as PutById and inlines SetterCall only when we found StructureStubInfo for this op_put_by_val.
// But still it is possible that we cannot find StructureStubInfo here. Let's consider the following scenario.
// 1. Baseline CodeBlock (A) is compiled.
// 2. (A) gets DFG (B).
// 3. Since (A) collects enough information for put_by_val, (B) can get StructureStubInfo from (A) and copmile it as inlined Setter call.
// 4. (A)'s JITData is destroyed since it is not executed. Then, (A) becomes LLInt.
// 5. The CodeBlock inlining (A) gets OSR exit. So (A) is executed and (A) eventually gets Baseline CodeBlock again.
// 6. (B) gets OSR exit. (B) attempts to search for StructureStubInfo in (A) for PutById (originally, put_by_val). But it does not exist since (A)'s JITData is cleared once.
ByValInfo* byValInfo = baselineCodeBlockForCaller->findByValInfo(CodeOrigin(callBytecodeIndex));
RELEASE_ASSERT(byValInfo);
jumpTarget = byValInfo->doneTarget.retagged<JSEntryPtrTag>();
break;
}
StructureStubInfo* stubInfo = baselineCodeBlockForCaller->findStubInfo(CodeOrigin(callBytecodeIndex));
RELEASE_ASSERT(stubInfo);
jumpTarget = stubInfo->doneLocation.retagged<JSEntryPtrTag>();
break;
}
default:
RELEASE_ASSERT_NOT_REACHED();
}
}
ASSERT(jumpTarget);
return jumpTarget;
}
CCallHelpers::Address calleeSaveSlot(InlineCallFrame* inlineCallFrame, CodeBlock* baselineCodeBlock, GPRReg calleeSave)
{
const RegisterAtOffsetList* calleeSaves = baselineCodeBlock->calleeSaveRegisters();
for (unsigned i = 0; i < calleeSaves->size(); i++) {
RegisterAtOffset entry = calleeSaves->at(i);
if (entry.reg() != calleeSave)
continue;
return CCallHelpers::Address(CCallHelpers::framePointerRegister, static_cast<VirtualRegister>(inlineCallFrame->stackOffset).offsetInBytes() + entry.offset());
}
RELEASE_ASSERT_NOT_REACHED();
return CCallHelpers::Address(CCallHelpers::framePointerRegister);
}
void reifyInlinedCallFrames(CCallHelpers& jit, const OSRExitBase& exit)
{
// FIXME: We shouldn't leave holes on the stack when performing an OSR exit
// in presence of inlined tail calls.
// https://bugs.webkit.org/show_bug.cgi?id=147511
ASSERT(JITCode::isBaselineCode(jit.baselineCodeBlock()->jitType()));
jit.storePtr(AssemblyHelpers::TrustedImmPtr(jit.baselineCodeBlock()), AssemblyHelpers::addressFor(CallFrameSlot::codeBlock));
const CodeOrigin* codeOrigin;
for (codeOrigin = &exit.m_codeOrigin; codeOrigin && codeOrigin->inlineCallFrame(); codeOrigin = codeOrigin->inlineCallFrame()->getCallerSkippingTailCalls()) {
InlineCallFrame* inlineCallFrame = codeOrigin->inlineCallFrame();
CodeBlock* baselineCodeBlock = jit.baselineCodeBlockFor(*codeOrigin);
InlineCallFrame::Kind trueCallerCallKind;
CodeOrigin* trueCaller = inlineCallFrame->getCallerSkippingTailCalls(&trueCallerCallKind);
GPRReg callerFrameGPR = GPRInfo::callFrameRegister;
bool callerIsLLInt = false;
if (!trueCaller) {
ASSERT(inlineCallFrame->isTail());
jit.loadPtr(AssemblyHelpers::Address(GPRInfo::callFrameRegister, CallFrame::returnPCOffset()), GPRInfo::regT3);
#if CPU(ARM64E)
jit.addPtr(AssemblyHelpers::TrustedImm32(sizeof(CallerFrameAndPC)), GPRInfo::callFrameRegister, GPRInfo::regT2);
jit.untagPtr(GPRInfo::regT2, GPRInfo::regT3);
jit.addPtr(AssemblyHelpers::TrustedImm32(inlineCallFrame->returnPCOffset() + sizeof(void*)), GPRInfo::callFrameRegister, GPRInfo::regT2);
jit.validateUntaggedPtr(GPRInfo::regT3, GPRInfo::nonArgGPR0);
jit.tagPtr(GPRInfo::regT2, GPRInfo::regT3);
#endif
jit.storePtr(GPRInfo::regT3, AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset()));
jit.loadPtr(AssemblyHelpers::Address(GPRInfo::callFrameRegister, CallFrame::callerFrameOffset()), GPRInfo::regT3);
callerFrameGPR = GPRInfo::regT3;
} else {
CodeBlock* baselineCodeBlockForCaller = jit.baselineCodeBlockFor(*trueCaller);
auto callBytecodeIndex = trueCaller->bytecodeIndex();
MacroAssemblerCodePtr<JSEntryPtrTag> jumpTarget = callerReturnPC(baselineCodeBlockForCaller, callBytecodeIndex, trueCallerCallKind, callerIsLLInt);
if (trueCaller->inlineCallFrame()) {
jit.addPtr(
AssemblyHelpers::TrustedImm32(trueCaller->inlineCallFrame()->stackOffset * sizeof(EncodedJSValue)),
GPRInfo::callFrameRegister,
GPRInfo::regT3);
callerFrameGPR = GPRInfo::regT3;
}
#if CPU(ARM64E)
jit.addPtr(AssemblyHelpers::TrustedImm32(inlineCallFrame->returnPCOffset() + sizeof(void*)), GPRInfo::callFrameRegister, GPRInfo::regT2);
jit.move(AssemblyHelpers::TrustedImmPtr(jumpTarget.untaggedExecutableAddress()), GPRInfo::nonArgGPR0);
jit.tagPtr(GPRInfo::regT2, GPRInfo::nonArgGPR0);
jit.storePtr(GPRInfo::nonArgGPR0, AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset()));
#else
jit.storePtr(AssemblyHelpers::TrustedImmPtr(jumpTarget.untaggedExecutableAddress()), AssemblyHelpers::addressForByteOffset(inlineCallFrame->returnPCOffset()));
#endif
}
jit.storePtr(AssemblyHelpers::TrustedImmPtr(baselineCodeBlock), AssemblyHelpers::addressFor((VirtualRegister)(inlineCallFrame->stackOffset + CallFrameSlot::codeBlock)));
// Restore the inline call frame's callee save registers.
// If this inlined frame is a tail call that will return back to the original caller, we need to
// copy the prior contents of the tag registers already saved for the outer frame to this frame.
jit.emitSaveOrCopyCalleeSavesFor(
baselineCodeBlock,
static_cast<VirtualRegister>(inlineCallFrame->stackOffset),
trueCaller ? AssemblyHelpers::UseExistingTagRegisterContents : AssemblyHelpers::CopyBaselineCalleeSavedRegistersFromBaseFrame,
GPRInfo::regT2);
if (callerIsLLInt) {
CodeBlock* baselineCodeBlockForCaller = jit.baselineCodeBlockFor(*trueCaller);
jit.storePtr(CCallHelpers::TrustedImmPtr(baselineCodeBlockForCaller->metadataTable()), calleeSaveSlot(inlineCallFrame, baselineCodeBlock, LLInt::Registers::metadataTableGPR));
jit.storePtr(CCallHelpers::TrustedImmPtr(baselineCodeBlockForCaller->instructionsRawPointer()), calleeSaveSlot(inlineCallFrame, baselineCodeBlock, LLInt::Registers::pbGPR));
}
if (!inlineCallFrame->isVarargs())
jit.store32(AssemblyHelpers::TrustedImm32(inlineCallFrame->argumentCountIncludingThis), AssemblyHelpers::payloadFor(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::argumentCountIncludingThis)));
jit.storePtr(callerFrameGPR, AssemblyHelpers::addressForByteOffset(inlineCallFrame->callerFrameOffset()));
uint32_t locationBits = CallSiteIndex(baselineCodeBlock->bytecodeIndexForExit(codeOrigin->bytecodeIndex())).bits();
jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::argumentCountIncludingThis)));
#if USE(JSVALUE64)
if (!inlineCallFrame->isClosureCall)
jit.store64(AssemblyHelpers::TrustedImm64(JSValue::encode(JSValue(inlineCallFrame->calleeConstant()))), AssemblyHelpers::addressFor(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::callee)));
#else // USE(JSVALUE64) // so this is the 32-bit part
jit.store32(AssemblyHelpers::TrustedImm32(JSValue::CellTag), AssemblyHelpers::tagFor(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::callee)));
if (!inlineCallFrame->isClosureCall)
jit.storePtr(AssemblyHelpers::TrustedImmPtr(inlineCallFrame->calleeConstant()), AssemblyHelpers::payloadFor(VirtualRegister(inlineCallFrame->stackOffset + CallFrameSlot::callee)));
#endif // USE(JSVALUE64) // ending the #else part, so directly above is the 32-bit part
}
// Don't need to set the toplevel code origin if we only did inline tail calls
if (codeOrigin) {
uint32_t locationBits = CallSiteIndex(BytecodeIndex(codeOrigin->bytecodeIndex().offset())).bits();
jit.store32(AssemblyHelpers::TrustedImm32(locationBits), AssemblyHelpers::tagFor(CallFrameSlot::argumentCountIncludingThis));
}
}
static void osrWriteBarrier(VM& vm, CCallHelpers& jit, GPRReg owner, GPRReg scratch)
{
AssemblyHelpers::Jump ownerIsRememberedOrInEden = jit.barrierBranchWithoutFence(owner);
jit.setupArguments<decltype(operationOSRWriteBarrier)>(&vm, owner);
jit.prepareCallOperation(vm);
jit.move(MacroAssembler::TrustedImmPtr(tagCFunction<OperationPtrTag>(operationOSRWriteBarrier)), scratch);
jit.call(scratch, OperationPtrTag);
ownerIsRememberedOrInEden.link(&jit);
}
void adjustAndJumpToTarget(VM& vm, CCallHelpers& jit, const OSRExitBase& exit)
{
jit.memoryFence();
jit.move(
AssemblyHelpers::TrustedImmPtr(
jit.codeBlock()->baselineAlternative()), GPRInfo::argumentGPR1);
osrWriteBarrier(vm, jit, GPRInfo::argumentGPR1, GPRInfo::nonArgGPR0);
// We barrier all inlined frames -- and not just the current inline stack --
// because we don't know which inlined function owns the value profile that
// we'll update when we exit. In the case of "f() { a(); b(); }", if both
// a and b are inlined, we might exit inside b due to a bad value loaded
// from a.
// FIXME: MethodOfGettingAValueProfile should remember which CodeBlock owns
// the value profile.
InlineCallFrameSet* inlineCallFrames = jit.codeBlock()->jitCode()->dfgCommon()->inlineCallFrames.get();
if (inlineCallFrames) {
for (InlineCallFrame* inlineCallFrame : *inlineCallFrames) {
jit.move(
AssemblyHelpers::TrustedImmPtr(
inlineCallFrame->baselineCodeBlock.get()), GPRInfo::argumentGPR1);
osrWriteBarrier(vm, jit, GPRInfo::argumentGPR1, GPRInfo::nonArgGPR0);
}
}
auto* exitInlineCallFrame = exit.m_codeOrigin.inlineCallFrame();
if (exitInlineCallFrame)
jit.addPtr(AssemblyHelpers::TrustedImm32(exitInlineCallFrame->stackOffset * sizeof(EncodedJSValue)), GPRInfo::callFrameRegister);
CodeBlock* codeBlockForExit = jit.baselineCodeBlockFor(exit.m_codeOrigin);
ASSERT(codeBlockForExit == codeBlockForExit->baselineVersion());
ASSERT(JITCode::isBaselineCode(codeBlockForExit->jitType()));
void* jumpTarget;
bool exitToLLInt = Options::forceOSRExitToLLInt() || codeBlockForExit->jitType() == JITType::InterpreterThunk;
if (exitToLLInt) {
auto bytecodeIndex = exit.m_codeOrigin.bytecodeIndex();
const Instruction& currentInstruction = *codeBlockForExit->instructions().at(bytecodeIndex).ptr();
MacroAssemblerCodePtr<JSEntryPtrTag> destination;
if (bytecodeIndex.checkpoint())
destination = LLInt::checkpointOSRExitTrampolineThunk().code();
else
destination = LLInt::normalOSRExitTrampolineThunk().code();
if (exit.isExceptionHandler()) {
jit.move(CCallHelpers::TrustedImmPtr(¤tInstruction), GPRInfo::regT2);
jit.storePtr(GPRInfo::regT2, &vm.targetInterpreterPCForThrow);
}
jit.move(CCallHelpers::TrustedImmPtr(codeBlockForExit->metadataTable()), LLInt::Registers::metadataTableGPR);
jit.move(CCallHelpers::TrustedImmPtr(codeBlockForExit->instructionsRawPointer()), LLInt::Registers::pbGPR);
jit.move(CCallHelpers::TrustedImm32(bytecodeIndex.offset()), LLInt::Registers::pcGPR);
jumpTarget = destination.retagged<OSRExitPtrTag>().executableAddress();
} else {
codeBlockForExit->m_hasLinkedOSRExit = true;
BytecodeIndex exitIndex = exit.m_codeOrigin.bytecodeIndex();
MacroAssemblerCodePtr<JSEntryPtrTag> destination;
if (exitIndex.checkpoint())
destination = LLInt::checkpointOSRExitTrampolineThunk().code();
else {
ASSERT(codeBlockForExit->bytecodeIndexForExit(exitIndex) == exitIndex);
destination = codeBlockForExit->jitCodeMap().find(exitIndex);
}
ASSERT(destination);
jumpTarget = destination.retagged<OSRExitPtrTag>().executableAddress();
}
jit.addPtr(AssemblyHelpers::TrustedImm32(JIT::stackPointerOffsetFor(codeBlockForExit) * sizeof(Register)), GPRInfo::callFrameRegister, AssemblyHelpers::stackPointerRegister);
if (exit.isExceptionHandler()) {
// Since we're jumping to op_catch, we need to set callFrameForCatch.
jit.storePtr(GPRInfo::callFrameRegister, vm.addressOfCallFrameForCatch());
}
jit.move(AssemblyHelpers::TrustedImmPtr(jumpTarget), GPRInfo::regT2);
jit.farJump(GPRInfo::regT2, OSRExitPtrTag);
}
} } // namespace JSC::DFG
#endif // ENABLE(DFG_JIT)