1/*
2 * Copyright (C) 2011-2019 Apple Inc. All rights reserved.
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 *
13 * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
14 * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
15 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
16 * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
17 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
18 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
19 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
20 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
21 * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
22 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
23 * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
24 */
25
26#include "config.h"
27#include "LLIntSlowPaths.h"
28
29#include "ArrayConstructor.h"
30#include "CallFrame.h"
31#include "CommonSlowPaths.h"
32#include "Error.h"
33#include "ErrorHandlingScope.h"
34#include "EvalCodeBlock.h"
35#include "Exception.h"
36#include "ExceptionFuzz.h"
37#include "ExecutableBaseInlines.h"
38#include "FrameTracers.h"
39#include "FunctionCodeBlock.h"
40#include "FunctionWhitelist.h"
41#include "GetterSetter.h"
42#include "HostCallReturnValue.h"
43#include "InterpreterInlines.h"
44#include "IteratorOperations.h"
45#include "JIT.h"
46#include "JITExceptions.h"
47#include "JITWorklist.h"
48#include "JSAsyncFunction.h"
49#include "JSAsyncGeneratorFunction.h"
50#include "JSCInlines.h"
51#include "JSCJSValue.h"
52#include "JSGeneratorFunction.h"
53#include "JSGlobalObjectFunctions.h"
54#include "JSLexicalEnvironment.h"
55#include "JSString.h"
56#include "JSWithScope.h"
57#include "LLIntCommon.h"
58#include "LLIntData.h"
59#include "LLIntExceptions.h"
60#include "LLIntPrototypeLoadAdaptiveStructureWatchpoint.h"
61#include "LowLevelInterpreter.h"
62#include "ModuleProgramCodeBlock.h"
63#include "ObjectConstructor.h"
64#include "ObjectPropertyConditionSet.h"
65#include "OpcodeInlines.h"
66#include "ProgramCodeBlock.h"
67#include "ProtoCallFrame.h"
68#include "RegExpObject.h"
69#include "ShadowChicken.h"
70#include "StructureRareDataInlines.h"
71#include "SuperSampler.h"
72#include "VMInlines.h"
73#include <wtf/NeverDestroyed.h>
74#include <wtf/StringPrintStream.h>
75
76namespace JSC { namespace LLInt {
77
78#define LLINT_BEGIN_NO_SET_PC() \
79 VM& vm = exec->vm(); \
80 NativeCallFrameTracer tracer(&vm, exec); \
81 auto throwScope = DECLARE_THROW_SCOPE(vm)
82
83#ifndef NDEBUG
84#define LLINT_SET_PC_FOR_STUBS() do { \
85 exec->codeBlock()->bytecodeOffset(pc); \
86 exec->setCurrentVPC(pc); \
87 } while (false)
88#else
89#define LLINT_SET_PC_FOR_STUBS() do { \
90 exec->setCurrentVPC(pc); \
91 } while (false)
92#endif
93
94#define LLINT_BEGIN() \
95 LLINT_BEGIN_NO_SET_PC(); \
96 LLINT_SET_PC_FOR_STUBS()
97
98inline JSValue getNonConstantOperand(ExecState* exec, const VirtualRegister& operand) { return exec->uncheckedR(operand.offset()).jsValue(); }
99inline JSValue getOperand(ExecState* exec, const VirtualRegister& operand) { return exec->r(operand.offset()).jsValue(); }
100
101#define LLINT_RETURN_TWO(first, second) do { \
102 return encodeResult(first, second); \
103 } while (false)
104
105#define LLINT_END_IMPL() LLINT_RETURN_TWO(pc, 0)
106
107#define LLINT_THROW(exceptionToThrow) do { \
108 throwException(exec, throwScope, exceptionToThrow); \
109 pc = returnToThrow(exec); \
110 LLINT_END_IMPL(); \
111 } while (false)
112
113#define LLINT_CHECK_EXCEPTION() do { \
114 doExceptionFuzzingIfEnabled(exec, throwScope, "LLIntSlowPaths", pc); \
115 if (UNLIKELY(throwScope.exception())) { \
116 pc = returnToThrow(exec); \
117 LLINT_END_IMPL(); \
118 } \
119 } while (false)
120
121#define LLINT_END() do { \
122 LLINT_CHECK_EXCEPTION(); \
123 LLINT_END_IMPL(); \
124 } while (false)
125
126#define JUMP_OFFSET(targetOffset) \
127 ((targetOffset) ? (targetOffset) : exec->codeBlock()->outOfLineJumpOffset(pc))
128
129#define JUMP_TO(target) do { \
130 pc = reinterpret_cast<const Instruction*>(reinterpret_cast<const uint8_t*>(pc) + (target)); \
131 } while (false)
132
133#define LLINT_BRANCH(condition) do { \
134 bool __b_condition = (condition); \
135 LLINT_CHECK_EXCEPTION(); \
136 if (__b_condition) \
137 JUMP_TO(JUMP_OFFSET(bytecode.m_targetLabel)); \
138 else \
139 JUMP_TO(pc->size()); \
140 LLINT_END_IMPL(); \
141 } while (false)
142
143#define LLINT_RETURN(value) do { \
144 JSValue __r_returnValue = (value); \
145 LLINT_CHECK_EXCEPTION(); \
146 exec->uncheckedR(bytecode.m_dst) = __r_returnValue; \
147 LLINT_END_IMPL(); \
148 } while (false)
149
150#define LLINT_RETURN_PROFILED(value) do { \
151 JSValue __rp_returnValue = (value); \
152 LLINT_CHECK_EXCEPTION(); \
153 exec->uncheckedR(bytecode.m_dst) = __rp_returnValue; \
154 LLINT_PROFILE_VALUE(__rp_returnValue); \
155 LLINT_END_IMPL(); \
156 } while (false)
157
158#define LLINT_PROFILE_VALUE(value) do { \
159 bytecode.metadata(exec).m_profile.m_buckets[0] = JSValue::encode(value); \
160 } while (false)
161
162#define LLINT_CALL_END_IMPL(exec, callTarget, callTargetTag) \
163 LLINT_RETURN_TWO(retagCodePtr((callTarget), callTargetTag, SlowPathPtrTag), (exec))
164
165#define LLINT_CALL_THROW(exec, exceptionToThrow) do { \
166 ExecState* __ct_exec = (exec); \
167 throwException(__ct_exec, throwScope, exceptionToThrow); \
168 LLINT_CALL_END_IMPL(0, callToThrow(__ct_exec), ExceptionHandlerPtrTag); \
169 } while (false)
170
171#define LLINT_CALL_CHECK_EXCEPTION(exec, execCallee) do { \
172 ExecState* __cce_exec = (exec); \
173 ExecState* __cce_execCallee = (execCallee); \
174 doExceptionFuzzingIfEnabled(__cce_exec, throwScope, "LLIntSlowPaths/call", nullptr); \
175 if (UNLIKELY(throwScope.exception())) \
176 LLINT_CALL_END_IMPL(0, callToThrow(__cce_execCallee), ExceptionHandlerPtrTag); \
177 } while (false)
178
179#define LLINT_CALL_RETURN(exec, execCallee, callTarget, callTargetTag) do { \
180 ExecState* __cr_exec = (exec); \
181 ExecState* __cr_execCallee = (execCallee); \
182 void* __cr_callTarget = (callTarget); \
183 LLINT_CALL_CHECK_EXCEPTION(__cr_exec, __cr_execCallee); \
184 LLINT_CALL_END_IMPL(__cr_execCallee, __cr_callTarget, callTargetTag); \
185 } while (false)
186
187#define LLINT_RETURN_CALLEE_FRAME(execCallee) do { \
188 ExecState* __rcf_exec = (execCallee); \
189 LLINT_RETURN_TWO(pc, __rcf_exec); \
190 } while (false)
191
192#if LLINT_TRACING
193
194template<typename... Types>
195void slowPathLog(const Types&... values)
196{
197 dataLogIf(Options::traceLLIntSlowPath(), values...);
198}
199
200template<typename... Types>
201void slowPathLn(const Types&... values)
202{
203 dataLogLnIf(Options::traceLLIntSlowPath(), values...);
204}
205
206template<typename... Types>
207void slowPathLogF(const char* format, const Types&... values)
208{
209 ALLOW_NONLITERAL_FORMAT_BEGIN
210 IGNORE_WARNINGS_BEGIN("format-security")
211 if (Options::traceLLIntSlowPath())
212 dataLogF(format, values...);
213 IGNORE_WARNINGS_END
214 ALLOW_NONLITERAL_FORMAT_END
215}
216
217#else // not LLINT_TRACING
218
219template<typename... Types> void slowPathLog(const Types&...) { }
220template<typename... Types> void slowPathLogLn(const Types&...) { }
221template<typename... Types> void slowPathLogF(const char*, const Types&...) { }
222
223#endif // LLINT_TRACING
224
225extern "C" SlowPathReturnType llint_trace_operand(ExecState* exec, const Instruction* pc, int fromWhere, int operand)
226{
227 if (!Options::traceLLIntExecution())
228 LLINT_END_IMPL();
229
230 LLINT_BEGIN();
231 dataLogF(
232 "<%p> %p / %p: executing bc#%zu, op#%u: Trace(%d): %d\n",
233 &Thread::current(),
234 exec->codeBlock(),
235 exec,
236 static_cast<intptr_t>(exec->codeBlock()->bytecodeOffset(pc)),
237 pc->opcodeID(),
238 fromWhere,
239 operand);
240 LLINT_END();
241}
242
243extern "C" SlowPathReturnType llint_trace_value(ExecState* exec, const Instruction* pc, int fromWhere, VirtualRegister operand)
244{
245 if (!Options::traceLLIntExecution())
246 LLINT_END_IMPL();
247
248 JSValue value = getOperand(exec, operand);
249 union {
250 struct {
251 uint32_t tag;
252 uint32_t payload;
253 } bits;
254 EncodedJSValue asValue;
255 } u;
256 u.asValue = JSValue::encode(value);
257 dataLogF(
258 "<%p> %p / %p: executing bc#%zu, op#%u: Trace(%d): %d: %08x:%08x: %s\n",
259 &Thread::current(),
260 exec->codeBlock(),
261 exec,
262 static_cast<intptr_t>(exec->codeBlock()->bytecodeOffset(pc)),
263 pc->opcodeID(),
264 fromWhere,
265 operand.offset(),
266 u.bits.tag,
267 u.bits.payload,
268 toCString(value).data());
269 LLINT_END_IMPL();
270}
271
272LLINT_SLOW_PATH_DECL(trace_prologue)
273{
274 if (!Options::traceLLIntExecution())
275 LLINT_END_IMPL();
276
277 dataLogF("<%p> %p / %p: in prologue of ", &Thread::current(), exec->codeBlock(), exec);
278 dataLog(exec->codeBlock(), "\n");
279 LLINT_END_IMPL();
280}
281
282static void traceFunctionPrologue(ExecState* exec, const char* comment, CodeSpecializationKind kind)
283{
284 if (!Options::traceLLIntExecution())
285 return;
286
287 JSFunction* callee = jsCast<JSFunction*>(exec->jsCallee());
288 FunctionExecutable* executable = callee->jsExecutable();
289 CodeBlock* codeBlock = executable->codeBlockFor(kind);
290 dataLogF("<%p> %p / %p: in %s of ", &Thread::current(), codeBlock, exec, comment);
291 dataLog(codeBlock);
292 dataLogF(" function %p, executable %p; numVars = %u, numParameters = %u, numCalleeLocals = %u, caller = %p.\n",
293 callee, executable, codeBlock->numVars(), codeBlock->numParameters(), codeBlock->numCalleeLocals(), exec->callerFrame());
294}
295
296LLINT_SLOW_PATH_DECL(trace_prologue_function_for_call)
297{
298 traceFunctionPrologue(exec, "call prologue", CodeForCall);
299 LLINT_END_IMPL();
300}
301
302LLINT_SLOW_PATH_DECL(trace_prologue_function_for_construct)
303{
304 traceFunctionPrologue(exec, "construct prologue", CodeForConstruct);
305 LLINT_END_IMPL();
306}
307
308LLINT_SLOW_PATH_DECL(trace_arityCheck_for_call)
309{
310 traceFunctionPrologue(exec, "call arity check", CodeForCall);
311 LLINT_END_IMPL();
312}
313
314LLINT_SLOW_PATH_DECL(trace_arityCheck_for_construct)
315{
316 traceFunctionPrologue(exec, "construct arity check", CodeForConstruct);
317 LLINT_END_IMPL();
318}
319
320LLINT_SLOW_PATH_DECL(trace)
321{
322 if (!Options::traceLLIntExecution())
323 LLINT_END_IMPL();
324
325 OpcodeID opcodeID = pc->opcodeID();
326 dataLogF("<%p> %p / %p: executing bc#%zu, %s, pc = %p\n",
327 &Thread::current(),
328 exec->codeBlock(),
329 exec,
330 static_cast<intptr_t>(exec->codeBlock()->bytecodeOffset(pc)),
331 pc->name(),
332 pc);
333 if (opcodeID == op_enter) {
334 dataLogF("Frame will eventually return to %p\n", exec->returnPC().value());
335 *removeCodePtrTag<volatile char*>(exec->returnPC().value());
336 }
337 if (opcodeID == op_ret) {
338 dataLogF("Will be returning to %p\n", exec->returnPC().value());
339 dataLogF("The new cfr will be %p\n", exec->callerFrame());
340 }
341 LLINT_END_IMPL();
342}
343
344enum EntryKind { Prologue, ArityCheck };
345
346#if ENABLE(JIT)
347static FunctionWhitelist& ensureGlobalJITWhitelist()
348{
349 static LazyNeverDestroyed<FunctionWhitelist> baselineWhitelist;
350 static std::once_flag initializeWhitelistFlag;
351 std::call_once(initializeWhitelistFlag, [] {
352 const char* functionWhitelistFile = Options::jitWhitelist();
353 baselineWhitelist.construct(functionWhitelistFile);
354 });
355 return baselineWhitelist;
356}
357
358inline bool shouldJIT(CodeBlock* codeBlock)
359{
360 if (!Options::bytecodeRangeToJITCompile().isInRange(codeBlock->instructionsSize())
361 || !ensureGlobalJITWhitelist().contains(codeBlock))
362 return false;
363
364 return VM::canUseJIT() && Options::useBaselineJIT();
365}
366
367// Returns true if we should try to OSR.
368inline bool jitCompileAndSetHeuristics(CodeBlock* codeBlock, ExecState* exec, unsigned loopOSREntryBytecodeOffset = 0)
369{
370 VM& vm = exec->vm();
371 DeferGCForAWhile deferGC(vm.heap); // My callers don't set top callframe, so we don't want to GC here at all.
372 ASSERT(VM::canUseJIT());
373
374 codeBlock->updateAllValueProfilePredictions();
375
376 if (!codeBlock->checkIfJITThresholdReached()) {
377 CODEBLOCK_LOG_EVENT(codeBlock, "delayJITCompile", ("threshold not reached, counter = ", codeBlock->llintExecuteCounter()));
378 if (Options::verboseOSR())
379 dataLogF(" JIT threshold should be lifted.\n");
380 return false;
381 }
382
383 JITWorklist::ensureGlobalWorklist().poll(vm);
384
385 switch (codeBlock->jitType()) {
386 case JITType::BaselineJIT: {
387 if (Options::verboseOSR())
388 dataLogF(" Code was already compiled.\n");
389 codeBlock->jitSoon();
390 return true;
391 }
392 case JITType::InterpreterThunk: {
393 JITWorklist::ensureGlobalWorklist().compileLater(codeBlock, loopOSREntryBytecodeOffset);
394 return codeBlock->jitType() == JITType::BaselineJIT;
395 }
396 default:
397 dataLog("Unexpected code block in LLInt: ", *codeBlock, "\n");
398 RELEASE_ASSERT_NOT_REACHED();
399 return false;
400 }
401}
402
403static SlowPathReturnType entryOSR(ExecState* exec, const Instruction*, CodeBlock* codeBlock, const char *name, EntryKind kind)
404{
405 if (Options::verboseOSR()) {
406 dataLog(
407 *codeBlock, ": Entered ", name, " with executeCounter = ",
408 codeBlock->llintExecuteCounter(), "\n");
409 }
410
411 if (!shouldJIT(codeBlock)) {
412 codeBlock->dontJITAnytimeSoon();
413 LLINT_RETURN_TWO(0, 0);
414 }
415 if (!jitCompileAndSetHeuristics(codeBlock, exec))
416 LLINT_RETURN_TWO(0, 0);
417
418 CODEBLOCK_LOG_EVENT(codeBlock, "OSR entry", ("in prologue"));
419
420 if (kind == Prologue)
421 LLINT_RETURN_TWO(codeBlock->jitCode()->executableAddress(), 0);
422 ASSERT(kind == ArityCheck);
423 LLINT_RETURN_TWO(codeBlock->jitCode()->addressForCall(MustCheckArity).executableAddress(), 0);
424}
425#else // ENABLE(JIT)
426static SlowPathReturnType entryOSR(ExecState* exec, const Instruction*, CodeBlock* codeBlock, const char*, EntryKind)
427{
428 codeBlock->dontJITAnytimeSoon();
429 LLINT_RETURN_TWO(0, exec);
430}
431#endif // ENABLE(JIT)
432
433LLINT_SLOW_PATH_DECL(entry_osr)
434{
435 return entryOSR(exec, pc, exec->codeBlock(), "entry_osr", Prologue);
436}
437
438LLINT_SLOW_PATH_DECL(entry_osr_function_for_call)
439{
440 return entryOSR(exec, pc, jsCast<JSFunction*>(exec->jsCallee())->jsExecutable()->codeBlockForCall(), "entry_osr_function_for_call", Prologue);
441}
442
443LLINT_SLOW_PATH_DECL(entry_osr_function_for_construct)
444{
445 return entryOSR(exec, pc, jsCast<JSFunction*>(exec->jsCallee())->jsExecutable()->codeBlockForConstruct(), "entry_osr_function_for_construct", Prologue);
446}
447
448LLINT_SLOW_PATH_DECL(entry_osr_function_for_call_arityCheck)
449{
450 return entryOSR(exec, pc, jsCast<JSFunction*>(exec->jsCallee())->jsExecutable()->codeBlockForCall(), "entry_osr_function_for_call_arityCheck", ArityCheck);
451}
452
453LLINT_SLOW_PATH_DECL(entry_osr_function_for_construct_arityCheck)
454{
455 return entryOSR(exec, pc, jsCast<JSFunction*>(exec->jsCallee())->jsExecutable()->codeBlockForConstruct(), "entry_osr_function_for_construct_arityCheck", ArityCheck);
456}
457
458LLINT_SLOW_PATH_DECL(loop_osr)
459{
460 LLINT_BEGIN_NO_SET_PC();
461 UNUSED_PARAM(throwScope);
462 CodeBlock* codeBlock = exec->codeBlock();
463
464#if ENABLE(JIT)
465 if (Options::verboseOSR()) {
466 dataLog(
467 *codeBlock, ": Entered loop_osr with executeCounter = ",
468 codeBlock->llintExecuteCounter(), "\n");
469 }
470
471 unsigned loopOSREntryBytecodeOffset = codeBlock->bytecodeOffset(pc);
472
473 if (!shouldJIT(codeBlock)) {
474 codeBlock->dontJITAnytimeSoon();
475 LLINT_RETURN_TWO(0, 0);
476 }
477
478 if (!jitCompileAndSetHeuristics(codeBlock, exec, loopOSREntryBytecodeOffset))
479 LLINT_RETURN_TWO(0, 0);
480
481 CODEBLOCK_LOG_EVENT(codeBlock, "osrEntry", ("at bc#", loopOSREntryBytecodeOffset));
482
483 ASSERT(codeBlock->jitType() == JITType::BaselineJIT);
484
485 const JITCodeMap& codeMap = codeBlock->jitCodeMap();
486 CodeLocationLabel<JSEntryPtrTag> codeLocation = codeMap.find(loopOSREntryBytecodeOffset);
487 ASSERT(codeLocation);
488
489 void* jumpTarget = codeLocation.executableAddress();
490 ASSERT(jumpTarget);
491
492 LLINT_RETURN_TWO(jumpTarget, exec->topOfFrame());
493#else // ENABLE(JIT)
494 UNUSED_PARAM(pc);
495 codeBlock->dontJITAnytimeSoon();
496 LLINT_RETURN_TWO(0, 0);
497#endif // ENABLE(JIT)
498}
499
500LLINT_SLOW_PATH_DECL(replace)
501{
502 LLINT_BEGIN_NO_SET_PC();
503 UNUSED_PARAM(throwScope);
504 CodeBlock* codeBlock = exec->codeBlock();
505
506#if ENABLE(JIT)
507 if (Options::verboseOSR()) {
508 dataLog(
509 *codeBlock, ": Entered replace with executeCounter = ",
510 codeBlock->llintExecuteCounter(), "\n");
511 }
512
513 if (shouldJIT(codeBlock))
514 jitCompileAndSetHeuristics(codeBlock, exec);
515 else
516 codeBlock->dontJITAnytimeSoon();
517 LLINT_END_IMPL();
518#else // ENABLE(JIT)
519 codeBlock->dontJITAnytimeSoon();
520 LLINT_END_IMPL();
521#endif // ENABLE(JIT)
522}
523
524LLINT_SLOW_PATH_DECL(stack_check)
525{
526 VM& vm = exec->vm();
527 auto throwScope = DECLARE_THROW_SCOPE(vm);
528
529 // It's ok to create the NativeCallFrameTracer here before we
530 // convertToStackOverflowFrame() because this function is always called
531 // after the frame has been propulated with a proper CodeBlock and callee.
532 NativeCallFrameTracer tracer(&vm, exec);
533
534 LLINT_SET_PC_FOR_STUBS();
535
536 CodeBlock* codeBlock = exec->codeBlock();
537 slowPathLogF("Checking stack height with exec = %p.\n", exec);
538 slowPathLog("CodeBlock = ", codeBlock, "\n");
539 if (codeBlock) {
540 slowPathLogF("Num callee registers = %u.\n", codeBlock->numCalleeLocals());
541 slowPathLogF("Num vars = %u.\n", codeBlock->numVars());
542 }
543 slowPathLogF("Current OS stack end is at %p.\n", vm.softStackLimit());
544#if ENABLE(C_LOOP)
545 slowPathLogF("Current C Loop stack end is at %p.\n", vm.cloopStackLimit());
546#endif
547
548 // If the stack check succeeds and we don't need to throw the error, then
549 // we'll return 0 instead. The prologue will check for a non-zero value
550 // when determining whether to set the callFrame or not.
551
552 // For JIT enabled builds which uses the C stack, the stack is not growable.
553 // Hence, if we get here, then we know a stack overflow is imminent. So, just
554 // throw the StackOverflowError unconditionally.
555#if ENABLE(C_LOOP)
556 Register* topOfFrame = exec->topOfFrame();
557 if (LIKELY(topOfFrame < reinterpret_cast<Register*>(exec))) {
558 ASSERT(!vm.interpreter->cloopStack().containsAddress(topOfFrame));
559 if (LIKELY(vm.ensureStackCapacityFor(topOfFrame)))
560 LLINT_RETURN_TWO(pc, 0);
561 }
562#endif
563
564 exec->convertToStackOverflowFrame(vm, codeBlock);
565 ErrorHandlingScope errorScope(vm);
566 throwStackOverflowError(exec, throwScope);
567 pc = returnToThrow(exec);
568 LLINT_RETURN_TWO(pc, exec);
569}
570
571LLINT_SLOW_PATH_DECL(slow_path_new_object)
572{
573 LLINT_BEGIN();
574 auto bytecode = pc->as<OpNewObject>();
575 auto& metadata = bytecode.metadata(exec);
576 LLINT_RETURN(constructEmptyObject(exec, metadata.m_objectAllocationProfile.structure()));
577}
578
579LLINT_SLOW_PATH_DECL(slow_path_new_array)
580{
581 LLINT_BEGIN();
582 auto bytecode = pc->as<OpNewArray>();
583 auto& metadata = bytecode.metadata(exec);
584 LLINT_RETURN(constructArrayNegativeIndexed(exec, &metadata.m_arrayAllocationProfile, bitwise_cast<JSValue*>(&exec->uncheckedR(bytecode.m_argv)), bytecode.m_argc));
585}
586
587LLINT_SLOW_PATH_DECL(slow_path_new_array_with_size)
588{
589 LLINT_BEGIN();
590 auto bytecode = pc->as<OpNewArrayWithSize>();
591 auto& metadata = bytecode.metadata(exec);
592 LLINT_RETURN(constructArrayWithSizeQuirk(exec, &metadata.m_arrayAllocationProfile, exec->lexicalGlobalObject(), getOperand(exec, bytecode.m_length)));
593}
594
595LLINT_SLOW_PATH_DECL(slow_path_new_regexp)
596{
597 LLINT_BEGIN();
598 auto bytecode = pc->as<OpNewRegexp>();
599 RegExp* regExp = jsCast<RegExp*>(getOperand(exec, bytecode.m_regexp));
600 ASSERT(regExp->isValid());
601 LLINT_RETURN(RegExpObject::create(vm, exec->lexicalGlobalObject()->regExpStructure(), regExp));
602}
603
604LLINT_SLOW_PATH_DECL(slow_path_instanceof)
605{
606 LLINT_BEGIN();
607 auto bytecode = pc->as<OpInstanceof>();
608 JSValue value = getOperand(exec, bytecode.m_value);
609 JSValue proto = getOperand(exec, bytecode.m_prototype);
610 LLINT_RETURN(jsBoolean(JSObject::defaultHasInstance(exec, value, proto)));
611}
612
613LLINT_SLOW_PATH_DECL(slow_path_instanceof_custom)
614{
615 LLINT_BEGIN();
616
617 auto bytecode = pc->as<OpInstanceofCustom>();
618 JSValue value = getOperand(exec, bytecode.m_value);
619 JSValue constructor = getOperand(exec, bytecode.m_constructor);
620 JSValue hasInstanceValue = getOperand(exec, bytecode.m_hasInstanceValue);
621
622 ASSERT(constructor.isObject());
623 ASSERT(hasInstanceValue != exec->lexicalGlobalObject()->functionProtoHasInstanceSymbolFunction() || !constructor.getObject()->structure(vm)->typeInfo().implementsDefaultHasInstance());
624
625 JSValue result = jsBoolean(constructor.getObject()->hasInstance(exec, value, hasInstanceValue));
626 LLINT_RETURN(result);
627}
628
629LLINT_SLOW_PATH_DECL(slow_path_try_get_by_id)
630{
631 LLINT_BEGIN();
632 auto bytecode = pc->as<OpTryGetById>();
633 CodeBlock* codeBlock = exec->codeBlock();
634 const Identifier& ident = codeBlock->identifier(bytecode.m_property);
635 JSValue baseValue = getOperand(exec, bytecode.m_base);
636 PropertySlot slot(baseValue, PropertySlot::PropertySlot::InternalMethodType::VMInquiry);
637
638 baseValue.getPropertySlot(exec, ident, slot);
639 JSValue result = slot.getPureResult();
640
641 LLINT_RETURN_PROFILED(result);
642}
643
644LLINT_SLOW_PATH_DECL(slow_path_get_by_id_direct)
645{
646 LLINT_BEGIN();
647 auto bytecode = pc->as<OpGetByIdDirect>();
648 CodeBlock* codeBlock = exec->codeBlock();
649 const Identifier& ident = codeBlock->identifier(bytecode.m_property);
650 JSValue baseValue = getOperand(exec, bytecode.m_base);
651 PropertySlot slot(baseValue, PropertySlot::PropertySlot::InternalMethodType::GetOwnProperty);
652
653 bool found = baseValue.getOwnPropertySlot(exec, ident, slot);
654 LLINT_CHECK_EXCEPTION();
655 JSValue result = found ? slot.getValue(exec, ident) : jsUndefined();
656 LLINT_CHECK_EXCEPTION();
657
658 if (!LLINT_ALWAYS_ACCESS_SLOW && slot.isCacheable()) {
659 auto& metadata = bytecode.metadata(exec);
660 {
661 StructureID oldStructureID = metadata.m_structureID;
662 if (oldStructureID) {
663 Structure* a = vm.heap.structureIDTable().get(oldStructureID);
664 Structure* b = baseValue.asCell()->structure(vm);
665
666 if (Structure::shouldConvertToPolyProto(a, b)) {
667 ASSERT(a->rareData()->sharedPolyProtoWatchpoint().get() == b->rareData()->sharedPolyProtoWatchpoint().get());
668 a->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
669 }
670 }
671 }
672
673 JSCell* baseCell = baseValue.asCell();
674 Structure* structure = baseCell->structure(vm);
675 if (slot.isValue()) {
676 // Start out by clearing out the old cache.
677 metadata.m_structureID = 0;
678 metadata.m_offset = 0;
679
680 if (structure->propertyAccessesAreCacheable()
681 && !structure->needImpurePropertyWatchpoint()) {
682 vm.heap.writeBarrier(codeBlock);
683
684 ConcurrentJSLocker locker(codeBlock->m_lock);
685
686 metadata.m_structureID = structure->id();
687 metadata.m_offset = slot.cachedOffset();
688 }
689 }
690 }
691
692 LLINT_RETURN_PROFILED(result);
693}
694
695
696static void setupGetByIdPrototypeCache(ExecState* exec, VM& vm, const Instruction* pc, OpGetById::Metadata& metadata, JSCell* baseCell, PropertySlot& slot, const Identifier& ident)
697{
698 CodeBlock* codeBlock = exec->codeBlock();
699 Structure* structure = baseCell->structure(vm);
700
701 if (structure->typeInfo().prohibitsPropertyCaching())
702 return;
703
704 if (structure->needImpurePropertyWatchpoint())
705 return;
706
707 if (structure->isDictionary()) {
708 if (structure->hasBeenFlattenedBefore())
709 return;
710 structure->flattenDictionaryStructure(vm, jsCast<JSObject*>(baseCell));
711 }
712
713 ObjectPropertyConditionSet conditions;
714 if (slot.isUnset())
715 conditions = generateConditionsForPropertyMiss(vm, codeBlock, exec, structure, ident.impl());
716 else
717 conditions = generateConditionsForPrototypePropertyHit(vm, codeBlock, exec, structure, slot.slotBase(), ident.impl());
718
719 if (!conditions.isValid())
720 return;
721
722 unsigned bytecodeOffset = codeBlock->bytecodeOffset(pc);
723 PropertyOffset offset = invalidOffset;
724 CodeBlock::StructureWatchpointMap& watchpointMap = codeBlock->llintGetByIdWatchpointMap();
725 Vector<LLIntPrototypeLoadAdaptiveStructureWatchpoint> watchpoints;
726 watchpoints.reserveInitialCapacity(conditions.size());
727 for (ObjectPropertyCondition condition : conditions) {
728 if (!condition.isWatchable())
729 return;
730 if (condition.condition().kind() == PropertyCondition::Presence)
731 offset = condition.condition().offset();
732 watchpoints.uncheckedConstructAndAppend(codeBlock, condition, bytecodeOffset);
733 watchpoints.last().install(vm);
734 }
735
736 ASSERT((offset == invalidOffset) == slot.isUnset());
737 auto result = watchpointMap.add(std::make_tuple(structure->id(), bytecodeOffset), WTFMove(watchpoints));
738 ASSERT_UNUSED(result, result.isNewEntry);
739
740 ConcurrentJSLocker locker(codeBlock->m_lock);
741
742 if (slot.isUnset()) {
743 metadata.m_modeMetadata.setUnsetMode(structure);
744 return;
745 }
746 ASSERT(slot.isValue());
747
748 metadata.m_modeMetadata.setProtoLoadMode(structure, offset, slot.slotBase());
749}
750
751
752LLINT_SLOW_PATH_DECL(slow_path_get_by_id)
753{
754 LLINT_BEGIN();
755 auto bytecode = pc->as<OpGetById>();
756 auto& metadata = bytecode.metadata(exec);
757 CodeBlock* codeBlock = exec->codeBlock();
758 const Identifier& ident = codeBlock->identifier(bytecode.m_property);
759 JSValue baseValue = getOperand(exec, bytecode.m_base);
760 PropertySlot slot(baseValue, PropertySlot::PropertySlot::InternalMethodType::Get);
761
762 JSValue result = baseValue.get(exec, ident, slot);
763 LLINT_CHECK_EXCEPTION();
764 exec->uncheckedR(bytecode.m_dst) = result;
765
766 if (!LLINT_ALWAYS_ACCESS_SLOW
767 && baseValue.isCell()
768 && slot.isCacheable()) {
769 {
770 StructureID oldStructureID;
771 switch (metadata.m_modeMetadata.mode) {
772 case GetByIdMode::Default:
773 oldStructureID = metadata.m_modeMetadata.defaultMode.structureID;
774 break;
775 case GetByIdMode::Unset:
776 oldStructureID = metadata.m_modeMetadata.unsetMode.structureID;
777 break;
778 case GetByIdMode::ProtoLoad:
779 oldStructureID = metadata.m_modeMetadata.protoLoadMode.structureID;
780 break;
781 default:
782 oldStructureID = 0;
783 }
784 if (oldStructureID) {
785 Structure* a = vm.heap.structureIDTable().get(oldStructureID);
786 Structure* b = baseValue.asCell()->structure(vm);
787
788 if (Structure::shouldConvertToPolyProto(a, b)) {
789 ASSERT(a->rareData()->sharedPolyProtoWatchpoint().get() == b->rareData()->sharedPolyProtoWatchpoint().get());
790 a->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
791 }
792 }
793 }
794
795 JSCell* baseCell = baseValue.asCell();
796 Structure* structure = baseCell->structure(vm);
797 if (slot.isValue() && slot.slotBase() == baseValue) {
798 ConcurrentJSLocker locker(codeBlock->m_lock);
799
800 // Start out by clearing out the old cache.
801 metadata.m_modeMetadata.clearToDefaultModeWithoutCache();
802
803 // Prevent the prototype cache from ever happening.
804 metadata.m_modeMetadata.hitCountForLLIntCaching = 0;
805
806 if (structure->propertyAccessesAreCacheable()
807 && !structure->needImpurePropertyWatchpoint()) {
808 vm.heap.writeBarrier(codeBlock);
809
810 metadata.m_modeMetadata.defaultMode.structureID = structure->id();
811 metadata.m_modeMetadata.defaultMode.cachedOffset = slot.cachedOffset();
812 }
813 } else if (UNLIKELY(metadata.m_modeMetadata.hitCountForLLIntCaching && (slot.isValue() || slot.isUnset()))) {
814 ASSERT(slot.slotBase() != baseValue);
815
816 if (!(--metadata.m_modeMetadata.hitCountForLLIntCaching))
817 setupGetByIdPrototypeCache(exec, vm, pc, metadata, baseCell, slot, ident);
818 }
819 } else if (!LLINT_ALWAYS_ACCESS_SLOW
820 && isJSArray(baseValue)
821 && ident == vm.propertyNames->length) {
822 ConcurrentJSLocker locker(codeBlock->m_lock);
823 metadata.m_modeMetadata.setArrayLengthMode();
824 metadata.m_modeMetadata.arrayLengthMode.arrayProfile.observeStructure(baseValue.asCell()->structure(vm));
825 }
826
827 LLINT_PROFILE_VALUE(result);
828 LLINT_END();
829}
830
831LLINT_SLOW_PATH_DECL(slow_path_put_by_id)
832{
833 LLINT_BEGIN();
834 auto bytecode = pc->as<OpPutById>();
835 auto& metadata = bytecode.metadata(exec);
836 CodeBlock* codeBlock = exec->codeBlock();
837 const Identifier& ident = codeBlock->identifier(bytecode.m_property);
838
839 JSValue baseValue = getOperand(exec, bytecode.m_base);
840 PutPropertySlot slot(baseValue, codeBlock->isStrictMode(), codeBlock->putByIdContext());
841 if (bytecode.m_flags & PutByIdIsDirect)
842 CommonSlowPaths::putDirectWithReify(vm, exec, asObject(baseValue), ident, getOperand(exec, bytecode.m_value), slot);
843 else
844 baseValue.putInline(exec, ident, getOperand(exec, bytecode.m_value), slot);
845 LLINT_CHECK_EXCEPTION();
846
847 if (!LLINT_ALWAYS_ACCESS_SLOW
848 && baseValue.isCell()
849 && slot.isCacheablePut()) {
850
851 {
852 StructureID oldStructureID = metadata.m_oldStructureID;
853 if (oldStructureID) {
854 Structure* a = vm.heap.structureIDTable().get(oldStructureID);
855 Structure* b = baseValue.asCell()->structure(vm);
856 if (slot.type() == PutPropertySlot::NewProperty)
857 b = b->previousID();
858
859 if (Structure::shouldConvertToPolyProto(a, b)) {
860 a->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
861 b->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
862 }
863 }
864 }
865
866 // Start out by clearing out the old cache.
867 metadata.m_oldStructureID = 0;
868 metadata.m_offset = 0;
869 metadata.m_newStructureID = 0;
870 metadata.m_structureChain.clear();
871
872 JSCell* baseCell = baseValue.asCell();
873 Structure* structure = baseCell->structure(vm);
874
875 if (!structure->isUncacheableDictionary()
876 && !structure->typeInfo().prohibitsPropertyCaching()
877 && baseCell == slot.base()) {
878
879 vm.heap.writeBarrier(codeBlock);
880
881 if (slot.type() == PutPropertySlot::NewProperty) {
882 GCSafeConcurrentJSLocker locker(codeBlock->m_lock, vm.heap);
883
884 if (!structure->isDictionary() && structure->previousID()->outOfLineCapacity() == structure->outOfLineCapacity()) {
885 ASSERT(structure->previousID()->transitionWatchpointSetHasBeenInvalidated());
886
887 bool sawPolyProto = false;
888 auto result = normalizePrototypeChain(exec, baseCell, sawPolyProto);
889 if (result != InvalidPrototypeChain && !sawPolyProto) {
890 ASSERT(structure->previousID()->isObject());
891 metadata.m_oldStructureID = structure->previousID()->id();
892 metadata.m_offset = slot.cachedOffset();
893 metadata.m_newStructureID = structure->id();
894 if (!(bytecode.m_flags & PutByIdIsDirect)) {
895 StructureChain* chain = structure->prototypeChain(exec, asObject(baseCell));
896 ASSERT(chain);
897 metadata.m_structureChain.set(vm, codeBlock, chain);
898 }
899 }
900 }
901 } else {
902 structure->didCachePropertyReplacement(vm, slot.cachedOffset());
903 metadata.m_oldStructureID = structure->id();
904 metadata.m_offset = slot.cachedOffset();
905 }
906 }
907 }
908
909 LLINT_END();
910}
911
912LLINT_SLOW_PATH_DECL(slow_path_del_by_id)
913{
914 LLINT_BEGIN();
915 auto bytecode = pc->as<OpDelById>();
916 CodeBlock* codeBlock = exec->codeBlock();
917 JSObject* baseObject = getOperand(exec, bytecode.m_base).toObject(exec);
918 LLINT_CHECK_EXCEPTION();
919 bool couldDelete = baseObject->methodTable(vm)->deleteProperty(baseObject, exec, codeBlock->identifier(bytecode.m_property));
920 LLINT_CHECK_EXCEPTION();
921 if (!couldDelete && codeBlock->isStrictMode())
922 LLINT_THROW(createTypeError(exec, UnableToDeletePropertyError));
923 LLINT_RETURN(jsBoolean(couldDelete));
924}
925
926static ALWAYS_INLINE JSValue getByVal(VM& vm, ExecState* exec, OpGetByVal bytecode)
927{
928 JSValue baseValue = getOperand(exec, bytecode.m_base);
929 JSValue subscript = getOperand(exec, bytecode.m_property);
930 auto scope = DECLARE_THROW_SCOPE(vm);
931
932 if (LIKELY(baseValue.isCell() && subscript.isString())) {
933 Structure& structure = *baseValue.asCell()->structure(vm);
934 if (JSCell::canUseFastGetOwnProperty(structure)) {
935 RefPtr<AtomStringImpl> existingAtomString = asString(subscript)->toExistingAtomString(exec);
936 RETURN_IF_EXCEPTION(scope, JSValue());
937 if (existingAtomString) {
938 if (JSValue result = baseValue.asCell()->fastGetOwnProperty(vm, structure, existingAtomString.get()))
939 return result;
940 }
941 }
942 }
943
944 if (subscript.isUInt32()) {
945 uint32_t i = subscript.asUInt32();
946 auto& metadata = bytecode.metadata(exec);
947 ArrayProfile* arrayProfile = &metadata.m_arrayProfile;
948
949 if (isJSString(baseValue)) {
950 if (asString(baseValue)->canGetIndex(i)) {
951 scope.release();
952 return asString(baseValue)->getIndex(exec, i);
953 }
954 arrayProfile->setOutOfBounds();
955 } else if (baseValue.isObject()) {
956 JSObject* object = asObject(baseValue);
957 if (object->canGetIndexQuickly(i))
958 return object->getIndexQuickly(i);
959
960 bool skipMarkingOutOfBounds = false;
961
962 if (object->indexingType() == ArrayWithContiguous && i < object->butterfly()->publicLength()) {
963 // FIXME: expand this to ArrayStorage, Int32, and maybe Double:
964 // https://bugs.webkit.org/show_bug.cgi?id=182940
965 auto* globalObject = object->globalObject(vm);
966 skipMarkingOutOfBounds = globalObject->isOriginalArrayStructure(object->structure(vm)) && globalObject->arrayPrototypeChainIsSane();
967 }
968
969 if (!skipMarkingOutOfBounds && !CommonSlowPaths::canAccessArgumentIndexQuickly(*object, i))
970 arrayProfile->setOutOfBounds();
971 }
972
973 scope.release();
974 return baseValue.get(exec, i);
975 }
976
977 baseValue.requireObjectCoercible(exec);
978 RETURN_IF_EXCEPTION(scope, JSValue());
979 auto property = subscript.toPropertyKey(exec);
980 RETURN_IF_EXCEPTION(scope, JSValue());
981 scope.release();
982 return baseValue.get(exec, property);
983}
984
985LLINT_SLOW_PATH_DECL(slow_path_get_by_val)
986{
987 LLINT_BEGIN();
988 auto bytecode = pc->as<OpGetByVal>();
989 LLINT_RETURN_PROFILED(getByVal(vm, exec, bytecode));
990}
991
992LLINT_SLOW_PATH_DECL(slow_path_put_by_val)
993{
994 LLINT_BEGIN();
995
996 auto bytecode = pc->as<OpPutByVal>();
997 JSValue baseValue = getOperand(exec, bytecode.m_base);
998 JSValue subscript = getOperand(exec, bytecode.m_property);
999 JSValue value = getOperand(exec, bytecode.m_value);
1000 bool isStrictMode = exec->codeBlock()->isStrictMode();
1001
1002 if (LIKELY(subscript.isUInt32())) {
1003 uint32_t i = subscript.asUInt32();
1004 if (baseValue.isObject()) {
1005 JSObject* object = asObject(baseValue);
1006 if (object->canSetIndexQuickly(i))
1007 object->setIndexQuickly(vm, i, value);
1008 else
1009 object->methodTable(vm)->putByIndex(object, exec, i, value, isStrictMode);
1010 LLINT_END();
1011 }
1012 baseValue.putByIndex(exec, i, value, isStrictMode);
1013 LLINT_END();
1014 }
1015
1016 auto property = subscript.toPropertyKey(exec);
1017 LLINT_CHECK_EXCEPTION();
1018 PutPropertySlot slot(baseValue, isStrictMode);
1019 baseValue.put(exec, property, value, slot);
1020 LLINT_END();
1021}
1022
1023LLINT_SLOW_PATH_DECL(slow_path_put_by_val_direct)
1024{
1025 LLINT_BEGIN();
1026
1027 auto bytecode = pc->as<OpPutByValDirect>();
1028 JSValue baseValue = getOperand(exec, bytecode.m_base);
1029 JSValue subscript = getOperand(exec, bytecode.m_property);
1030 JSValue value = getOperand(exec, bytecode.m_value);
1031 RELEASE_ASSERT(baseValue.isObject());
1032 JSObject* baseObject = asObject(baseValue);
1033 bool isStrictMode = exec->codeBlock()->isStrictMode();
1034 if (LIKELY(subscript.isUInt32())) {
1035 // Despite its name, JSValue::isUInt32 will return true only for positive boxed int32_t; all those values are valid array indices.
1036 ASSERT(isIndex(subscript.asUInt32()));
1037 baseObject->putDirectIndex(exec, subscript.asUInt32(), value, 0, isStrictMode ? PutDirectIndexShouldThrow : PutDirectIndexShouldNotThrow);
1038 LLINT_END();
1039 }
1040
1041 if (subscript.isDouble()) {
1042 double subscriptAsDouble = subscript.asDouble();
1043 uint32_t subscriptAsUInt32 = static_cast<uint32_t>(subscriptAsDouble);
1044 if (subscriptAsDouble == subscriptAsUInt32 && isIndex(subscriptAsUInt32)) {
1045 baseObject->putDirectIndex(exec, subscriptAsUInt32, value, 0, isStrictMode ? PutDirectIndexShouldThrow : PutDirectIndexShouldNotThrow);
1046 LLINT_END();
1047 }
1048 }
1049
1050 // Don't put to an object if toString threw an exception.
1051 auto property = subscript.toPropertyKey(exec);
1052 if (UNLIKELY(throwScope.exception()))
1053 LLINT_END();
1054
1055 if (Optional<uint32_t> index = parseIndex(property))
1056 baseObject->putDirectIndex(exec, index.value(), value, 0, isStrictMode ? PutDirectIndexShouldThrow : PutDirectIndexShouldNotThrow);
1057 else {
1058 PutPropertySlot slot(baseObject, isStrictMode);
1059 CommonSlowPaths::putDirectWithReify(vm, exec, baseObject, property, value, slot);
1060 }
1061 LLINT_END();
1062}
1063
1064LLINT_SLOW_PATH_DECL(slow_path_del_by_val)
1065{
1066 LLINT_BEGIN();
1067 auto bytecode = pc->as<OpDelByVal>();
1068 JSValue baseValue = getOperand(exec, bytecode.m_base);
1069 JSObject* baseObject = baseValue.toObject(exec);
1070 LLINT_CHECK_EXCEPTION();
1071
1072 JSValue subscript = getOperand(exec, bytecode.m_property);
1073
1074 bool couldDelete;
1075
1076 uint32_t i;
1077 if (subscript.getUInt32(i))
1078 couldDelete = baseObject->methodTable(vm)->deletePropertyByIndex(baseObject, exec, i);
1079 else {
1080 LLINT_CHECK_EXCEPTION();
1081 auto property = subscript.toPropertyKey(exec);
1082 LLINT_CHECK_EXCEPTION();
1083 couldDelete = baseObject->methodTable(vm)->deleteProperty(baseObject, exec, property);
1084 }
1085 LLINT_CHECK_EXCEPTION();
1086
1087 if (!couldDelete && exec->codeBlock()->isStrictMode())
1088 LLINT_THROW(createTypeError(exec, UnableToDeletePropertyError));
1089
1090 LLINT_RETURN(jsBoolean(couldDelete));
1091}
1092
1093LLINT_SLOW_PATH_DECL(slow_path_put_getter_by_id)
1094{
1095 LLINT_BEGIN();
1096 auto bytecode = pc->as<OpPutGetterById>();
1097 ASSERT(getNonConstantOperand(exec, bytecode.m_base).isObject());
1098 JSObject* baseObj = asObject(getNonConstantOperand(exec, bytecode.m_base));
1099
1100 unsigned options = bytecode.m_attributes;
1101
1102 JSValue getter = getNonConstantOperand(exec, bytecode.m_accessor);
1103 ASSERT(getter.isObject());
1104
1105 baseObj->putGetter(exec, exec->codeBlock()->identifier(bytecode.m_property), asObject(getter), options);
1106 LLINT_END();
1107}
1108
1109LLINT_SLOW_PATH_DECL(slow_path_put_setter_by_id)
1110{
1111 LLINT_BEGIN();
1112 auto bytecode = pc->as<OpPutSetterById>();
1113 ASSERT(getNonConstantOperand(exec, bytecode.m_base).isObject());
1114 JSObject* baseObj = asObject(getNonConstantOperand(exec, bytecode.m_base));
1115
1116 unsigned options = bytecode.m_attributes;
1117
1118 JSValue setter = getNonConstantOperand(exec, bytecode.m_accessor);
1119 ASSERT(setter.isObject());
1120
1121 baseObj->putSetter(exec, exec->codeBlock()->identifier(bytecode.m_property), asObject(setter), options);
1122 LLINT_END();
1123}
1124
1125LLINT_SLOW_PATH_DECL(slow_path_put_getter_setter_by_id)
1126{
1127 LLINT_BEGIN();
1128 auto bytecode = pc->as<OpPutGetterSetterById>();
1129 ASSERT(getNonConstantOperand(exec, bytecode.m_base).isObject());
1130 JSObject* baseObject = asObject(getNonConstantOperand(exec, bytecode.m_base));
1131
1132 JSValue getter = getNonConstantOperand(exec, bytecode.m_getter);
1133 JSValue setter = getNonConstantOperand(exec, bytecode.m_setter);
1134 ASSERT(getter.isObject() || setter.isObject());
1135 GetterSetter* accessor = GetterSetter::create(vm, exec->lexicalGlobalObject(), getter, setter);
1136
1137 CommonSlowPaths::putDirectAccessorWithReify(vm, exec, baseObject, exec->codeBlock()->identifier(bytecode.m_property), accessor, bytecode.m_attributes);
1138 LLINT_END();
1139}
1140
1141LLINT_SLOW_PATH_DECL(slow_path_put_getter_by_val)
1142{
1143 LLINT_BEGIN();
1144 auto bytecode = pc->as<OpPutGetterByVal>();
1145 ASSERT(getNonConstantOperand(exec, bytecode.m_base).isObject());
1146 JSObject* baseObj = asObject(getNonConstantOperand(exec, bytecode.m_base));
1147 JSValue subscript = getOperand(exec, bytecode.m_property);
1148
1149 unsigned options = bytecode.m_attributes;
1150
1151 JSValue getter = getNonConstantOperand(exec, bytecode.m_accessor);
1152 ASSERT(getter.isObject());
1153
1154 auto property = subscript.toPropertyKey(exec);
1155 LLINT_CHECK_EXCEPTION();
1156
1157 baseObj->putGetter(exec, property, asObject(getter), options);
1158 LLINT_END();
1159}
1160
1161LLINT_SLOW_PATH_DECL(slow_path_put_setter_by_val)
1162{
1163 LLINT_BEGIN();
1164 auto bytecode = pc->as<OpPutSetterByVal>();
1165 ASSERT(getNonConstantOperand(exec, bytecode.m_base).isObject());
1166 JSObject* baseObj = asObject(getNonConstantOperand(exec, bytecode.m_base));
1167 JSValue subscript = getOperand(exec, bytecode.m_property);
1168
1169 unsigned options = bytecode.m_attributes;
1170
1171 JSValue setter = getNonConstantOperand(exec, bytecode.m_accessor);
1172 ASSERT(setter.isObject());
1173
1174 auto property = subscript.toPropertyKey(exec);
1175 LLINT_CHECK_EXCEPTION();
1176
1177 baseObj->putSetter(exec, property, asObject(setter), options);
1178 LLINT_END();
1179}
1180
1181LLINT_SLOW_PATH_DECL(slow_path_jtrue)
1182{
1183 LLINT_BEGIN();
1184 auto bytecode = pc->as<OpJtrue>();
1185 LLINT_BRANCH(getOperand(exec, bytecode.m_condition).toBoolean(exec));
1186}
1187
1188LLINT_SLOW_PATH_DECL(slow_path_jfalse)
1189{
1190 LLINT_BEGIN();
1191 auto bytecode = pc->as<OpJfalse>();
1192 LLINT_BRANCH(!getOperand(exec, bytecode.m_condition).toBoolean(exec));
1193}
1194
1195LLINT_SLOW_PATH_DECL(slow_path_jless)
1196{
1197 LLINT_BEGIN();
1198 auto bytecode = pc->as<OpJless>();
1199 LLINT_BRANCH(jsLess<true>(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1200}
1201
1202LLINT_SLOW_PATH_DECL(slow_path_jnless)
1203{
1204 LLINT_BEGIN();
1205 auto bytecode = pc->as<OpJnless>();
1206 LLINT_BRANCH(!jsLess<true>(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1207}
1208
1209LLINT_SLOW_PATH_DECL(slow_path_jgreater)
1210{
1211 LLINT_BEGIN();
1212 auto bytecode = pc->as<OpJgreater>();
1213 LLINT_BRANCH(jsLess<false>(exec, getOperand(exec, bytecode.m_rhs), getOperand(exec, bytecode.m_lhs)));
1214}
1215
1216LLINT_SLOW_PATH_DECL(slow_path_jngreater)
1217{
1218 LLINT_BEGIN();
1219 auto bytecode = pc->as<OpJngreater>();
1220 LLINT_BRANCH(!jsLess<false>(exec, getOperand(exec, bytecode.m_rhs), getOperand(exec, bytecode.m_lhs)));
1221}
1222
1223LLINT_SLOW_PATH_DECL(slow_path_jlesseq)
1224{
1225 LLINT_BEGIN();
1226 auto bytecode = pc->as<OpJlesseq>();
1227 LLINT_BRANCH(jsLessEq<true>(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1228}
1229
1230LLINT_SLOW_PATH_DECL(slow_path_jnlesseq)
1231{
1232 LLINT_BEGIN();
1233 auto bytecode = pc->as<OpJnlesseq>();
1234 LLINT_BRANCH(!jsLessEq<true>(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1235}
1236
1237LLINT_SLOW_PATH_DECL(slow_path_jgreatereq)
1238{
1239 LLINT_BEGIN();
1240 auto bytecode = pc->as<OpJgreatereq>();
1241 LLINT_BRANCH(jsLessEq<false>(exec, getOperand(exec, bytecode.m_rhs), getOperand(exec, bytecode.m_lhs)));
1242}
1243
1244LLINT_SLOW_PATH_DECL(slow_path_jngreatereq)
1245{
1246 LLINT_BEGIN();
1247 auto bytecode = pc->as<OpJngreatereq>();
1248 LLINT_BRANCH(!jsLessEq<false>(exec, getOperand(exec, bytecode.m_rhs), getOperand(exec, bytecode.m_lhs)));
1249}
1250
1251LLINT_SLOW_PATH_DECL(slow_path_jeq)
1252{
1253 LLINT_BEGIN();
1254 auto bytecode = pc->as<OpJeq>();
1255 LLINT_BRANCH(JSValue::equal(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1256}
1257
1258LLINT_SLOW_PATH_DECL(slow_path_jneq)
1259{
1260 LLINT_BEGIN();
1261 auto bytecode = pc->as<OpJneq>();
1262 LLINT_BRANCH(!JSValue::equal(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1263}
1264
1265LLINT_SLOW_PATH_DECL(slow_path_jstricteq)
1266{
1267 LLINT_BEGIN();
1268 auto bytecode = pc->as<OpJstricteq>();
1269 LLINT_BRANCH(JSValue::strictEqual(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1270}
1271
1272LLINT_SLOW_PATH_DECL(slow_path_jnstricteq)
1273{
1274 LLINT_BEGIN();
1275 auto bytecode = pc->as<OpJnstricteq>();
1276 LLINT_BRANCH(!JSValue::strictEqual(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1277}
1278
1279LLINT_SLOW_PATH_DECL(slow_path_switch_imm)
1280{
1281 LLINT_BEGIN();
1282 auto bytecode = pc->as<OpSwitchImm>();
1283 JSValue scrutinee = getOperand(exec, bytecode.m_scrutinee);
1284 ASSERT(scrutinee.isDouble());
1285 double value = scrutinee.asDouble();
1286 int32_t intValue = static_cast<int32_t>(value);
1287 int defaultOffset = JUMP_OFFSET(bytecode.m_defaultOffset);
1288 if (value == intValue) {
1289 CodeBlock* codeBlock = exec->codeBlock();
1290 JUMP_TO(codeBlock->switchJumpTable(bytecode.m_tableIndex).offsetForValue(intValue, defaultOffset));
1291 } else
1292 JUMP_TO(defaultOffset);
1293 LLINT_END();
1294}
1295
1296LLINT_SLOW_PATH_DECL(slow_path_switch_char)
1297{
1298 LLINT_BEGIN();
1299 auto bytecode = pc->as<OpSwitchChar>();
1300 JSValue scrutinee = getOperand(exec, bytecode.m_scrutinee);
1301 ASSERT(scrutinee.isString());
1302 JSString* string = asString(scrutinee);
1303 ASSERT(string->length() == 1);
1304 int defaultOffset = JUMP_OFFSET(bytecode.m_defaultOffset);
1305 StringImpl* impl = string->value(exec).impl();
1306 CodeBlock* codeBlock = exec->codeBlock();
1307 JUMP_TO(codeBlock->switchJumpTable(bytecode.m_tableIndex).offsetForValue((*impl)[0], defaultOffset));
1308 LLINT_END();
1309}
1310
1311LLINT_SLOW_PATH_DECL(slow_path_switch_string)
1312{
1313 LLINT_BEGIN();
1314 auto bytecode = pc->as<OpSwitchString>();
1315 JSValue scrutinee = getOperand(exec, bytecode.m_scrutinee);
1316 int defaultOffset = JUMP_OFFSET(bytecode.m_defaultOffset);
1317 if (!scrutinee.isString())
1318 JUMP_TO(defaultOffset);
1319 else {
1320 CodeBlock* codeBlock = exec->codeBlock();
1321 JUMP_TO(codeBlock->stringSwitchJumpTable(bytecode.m_tableIndex).offsetForValue(asString(scrutinee)->value(exec).impl(), defaultOffset));
1322 }
1323 LLINT_END();
1324}
1325
1326LLINT_SLOW_PATH_DECL(slow_path_new_func)
1327{
1328 LLINT_BEGIN();
1329 auto bytecode = pc->as<OpNewFunc>();
1330 CodeBlock* codeBlock = exec->codeBlock();
1331 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1332 slowPathLogF("Creating function!\n");
1333 LLINT_RETURN(JSFunction::create(vm, codeBlock->functionDecl(bytecode.m_functionDecl), scope));
1334}
1335
1336LLINT_SLOW_PATH_DECL(slow_path_new_generator_func)
1337{
1338 LLINT_BEGIN();
1339 auto bytecode = pc->as<OpNewGeneratorFunc>();
1340 CodeBlock* codeBlock = exec->codeBlock();
1341 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1342 slowPathLogF("Creating function!\n");
1343 LLINT_RETURN(JSGeneratorFunction::create(vm, codeBlock->functionDecl(bytecode.m_functionDecl), scope));
1344}
1345
1346LLINT_SLOW_PATH_DECL(slow_path_new_async_func)
1347{
1348 LLINT_BEGIN();
1349 auto bytecode = pc->as<OpNewAsyncFunc>();
1350 CodeBlock* codeBlock = exec->codeBlock();
1351 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1352 slowPathLogF("Creating async function!\n");
1353 LLINT_RETURN(JSAsyncFunction::create(vm, codeBlock->functionDecl(bytecode.m_functionDecl), scope));
1354}
1355
1356LLINT_SLOW_PATH_DECL(slow_path_new_async_generator_func)
1357{
1358 LLINT_BEGIN();
1359 auto bytecode = pc->as<OpNewAsyncGeneratorFunc>();
1360 CodeBlock* codeBlock = exec->codeBlock();
1361 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1362 slowPathLogF("Creating async generator function!\n");
1363 LLINT_RETURN(JSAsyncGeneratorFunction::create(vm, codeBlock->functionDecl(bytecode.m_functionDecl), scope));
1364}
1365
1366LLINT_SLOW_PATH_DECL(slow_path_new_func_exp)
1367{
1368 LLINT_BEGIN();
1369
1370 auto bytecode = pc->as<OpNewFuncExp>();
1371 CodeBlock* codeBlock = exec->codeBlock();
1372 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1373 FunctionExecutable* executable = codeBlock->functionExpr(bytecode.m_functionDecl);
1374
1375 LLINT_RETURN(JSFunction::create(vm, executable, scope));
1376}
1377
1378LLINT_SLOW_PATH_DECL(slow_path_new_generator_func_exp)
1379{
1380 LLINT_BEGIN();
1381
1382 auto bytecode = pc->as<OpNewGeneratorFuncExp>();
1383 CodeBlock* codeBlock = exec->codeBlock();
1384 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1385 FunctionExecutable* executable = codeBlock->functionExpr(bytecode.m_functionDecl);
1386
1387 LLINT_RETURN(JSGeneratorFunction::create(vm, executable, scope));
1388}
1389
1390LLINT_SLOW_PATH_DECL(slow_path_new_async_func_exp)
1391{
1392 LLINT_BEGIN();
1393
1394 auto bytecode = pc->as<OpNewAsyncFuncExp>();
1395 CodeBlock* codeBlock = exec->codeBlock();
1396 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1397 FunctionExecutable* executable = codeBlock->functionExpr(bytecode.m_functionDecl);
1398
1399 LLINT_RETURN(JSAsyncFunction::create(vm, executable, scope));
1400}
1401
1402LLINT_SLOW_PATH_DECL(slow_path_new_async_generator_func_exp)
1403{
1404 LLINT_BEGIN();
1405
1406 auto bytecode = pc->as<OpNewAsyncGeneratorFuncExp>();
1407 CodeBlock* codeBlock = exec->codeBlock();
1408 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1409 FunctionExecutable* executable = codeBlock->functionExpr(bytecode.m_functionDecl);
1410
1411 LLINT_RETURN(JSAsyncGeneratorFunction::create(vm, executable, scope));
1412}
1413
1414LLINT_SLOW_PATH_DECL(slow_path_set_function_name)
1415{
1416 LLINT_BEGIN();
1417 auto bytecode = pc->as<OpSetFunctionName>();
1418 JSFunction* func = jsCast<JSFunction*>(getNonConstantOperand(exec, bytecode.m_function));
1419 JSValue name = getOperand(exec, bytecode.m_name);
1420 func->setFunctionName(exec, name);
1421 LLINT_END();
1422}
1423
1424static SlowPathReturnType handleHostCall(ExecState* execCallee, JSValue callee, CodeSpecializationKind kind)
1425{
1426 slowPathLog("Performing host call.\n");
1427
1428 ExecState* exec = execCallee->callerFrame();
1429 VM& vm = exec->vm();
1430 auto throwScope = DECLARE_THROW_SCOPE(vm);
1431
1432 execCallee->setCodeBlock(0);
1433 execCallee->clearReturnPC();
1434
1435 if (kind == CodeForCall) {
1436 CallData callData;
1437 CallType callType = getCallData(vm, callee, callData);
1438
1439 ASSERT(callType != CallType::JS);
1440
1441 if (callType == CallType::Host) {
1442 NativeCallFrameTracer tracer(&vm, execCallee);
1443 execCallee->setCallee(asObject(callee));
1444 vm.hostCallReturnValue = JSValue::decode(callData.native.function(execCallee));
1445 LLINT_CALL_RETURN(execCallee, execCallee, LLInt::getCodePtr(getHostCallReturnValue), CFunctionPtrTag);
1446 }
1447
1448 slowPathLog("Call callee is not a function: ", callee, "\n");
1449
1450 ASSERT(callType == CallType::None);
1451 LLINT_CALL_THROW(exec, createNotAFunctionError(exec, callee));
1452 }
1453
1454 ASSERT(kind == CodeForConstruct);
1455
1456 ConstructData constructData;
1457 ConstructType constructType = getConstructData(vm, callee, constructData);
1458
1459 ASSERT(constructType != ConstructType::JS);
1460
1461 if (constructType == ConstructType::Host) {
1462 NativeCallFrameTracer tracer(&vm, execCallee);
1463 execCallee->setCallee(asObject(callee));
1464 vm.hostCallReturnValue = JSValue::decode(constructData.native.function(execCallee));
1465 LLINT_CALL_RETURN(execCallee, execCallee, LLInt::getCodePtr(getHostCallReturnValue), CFunctionPtrTag);
1466 }
1467
1468 slowPathLog("Constructor callee is not a function: ", callee, "\n");
1469
1470 ASSERT(constructType == ConstructType::None);
1471 LLINT_CALL_THROW(exec, createNotAConstructorError(exec, callee));
1472}
1473
1474inline SlowPathReturnType setUpCall(ExecState* execCallee, CodeSpecializationKind kind, JSValue calleeAsValue, LLIntCallLinkInfo* callLinkInfo = nullptr)
1475{
1476 ExecState* exec = execCallee->callerFrame();
1477 VM& vm = exec->vm();
1478 auto throwScope = DECLARE_THROW_SCOPE(vm);
1479
1480 slowPathLogF("Performing call with recorded PC = %p\n", exec->currentVPC());
1481
1482 JSCell* calleeAsFunctionCell = getJSFunction(calleeAsValue);
1483 if (!calleeAsFunctionCell) {
1484 if (auto* internalFunction = jsDynamicCast<InternalFunction*>(vm, calleeAsValue)) {
1485 MacroAssemblerCodePtr<JSEntryPtrTag> codePtr = vm.getCTIInternalFunctionTrampolineFor(kind);
1486 ASSERT(!!codePtr);
1487
1488 if (!LLINT_ALWAYS_ACCESS_SLOW && callLinkInfo) {
1489 CodeBlock* callerCodeBlock = exec->codeBlock();
1490
1491 ConcurrentJSLocker locker(callerCodeBlock->m_lock);
1492 callLinkInfo->link(vm, callerCodeBlock, internalFunction, codePtr);
1493 }
1494
1495 assertIsTaggedWith(codePtr.executableAddress(), JSEntryPtrTag);
1496 LLINT_CALL_RETURN(exec, execCallee, codePtr.executableAddress(), JSEntryPtrTag);
1497 }
1498 RELEASE_AND_RETURN(throwScope, handleHostCall(execCallee, calleeAsValue, kind));
1499 }
1500 JSFunction* callee = jsCast<JSFunction*>(calleeAsFunctionCell);
1501 JSScope* scope = callee->scopeUnchecked();
1502 ExecutableBase* executable = callee->executable();
1503
1504 MacroAssemblerCodePtr<JSEntryPtrTag> codePtr;
1505 CodeBlock* codeBlock = 0;
1506 if (executable->isHostFunction())
1507 codePtr = executable->entrypointFor(kind, MustCheckArity);
1508 else {
1509 FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
1510
1511 if (!isCall(kind) && functionExecutable->constructAbility() == ConstructAbility::CannotConstruct)
1512 LLINT_CALL_THROW(exec, createNotAConstructorError(exec, callee));
1513
1514 CodeBlock** codeBlockSlot = execCallee->addressOfCodeBlock();
1515 Exception* error = functionExecutable->prepareForExecution<FunctionExecutable>(vm, callee, scope, kind, *codeBlockSlot);
1516 EXCEPTION_ASSERT(throwScope.exception() == error);
1517 if (UNLIKELY(error))
1518 LLINT_CALL_THROW(exec, error);
1519 codeBlock = *codeBlockSlot;
1520 ASSERT(codeBlock);
1521 ArityCheckMode arity;
1522 if (execCallee->argumentCountIncludingThis() < static_cast<size_t>(codeBlock->numParameters()))
1523 arity = MustCheckArity;
1524 else
1525 arity = ArityCheckNotRequired;
1526 codePtr = functionExecutable->entrypointFor(kind, arity);
1527 }
1528
1529 ASSERT(!!codePtr);
1530
1531 if (!LLINT_ALWAYS_ACCESS_SLOW && callLinkInfo) {
1532 CodeBlock* callerCodeBlock = exec->codeBlock();
1533
1534 ConcurrentJSLocker locker(callerCodeBlock->m_lock);
1535 callLinkInfo->link(vm, callerCodeBlock, callee, codePtr);
1536 if (codeBlock)
1537 codeBlock->linkIncomingCall(exec, callLinkInfo);
1538 }
1539
1540 assertIsTaggedWith(codePtr.executableAddress(), JSEntryPtrTag);
1541 LLINT_CALL_RETURN(exec, execCallee, codePtr.executableAddress(), JSEntryPtrTag);
1542}
1543
1544template<typename Op>
1545inline SlowPathReturnType genericCall(ExecState* exec, Op&& bytecode, CodeSpecializationKind kind)
1546{
1547 // This needs to:
1548 // - Set up a call frame.
1549 // - Figure out what to call and compile it if necessary.
1550 // - If possible, link the call's inline cache.
1551 // - Return a tuple of machine code address to call and the new call frame.
1552
1553 JSValue calleeAsValue = getOperand(exec, bytecode.m_callee);
1554
1555 ExecState* execCallee = exec - bytecode.m_argv;
1556
1557 execCallee->setArgumentCountIncludingThis(bytecode.m_argc);
1558 execCallee->uncheckedR(CallFrameSlot::callee) = calleeAsValue;
1559 execCallee->setCallerFrame(exec);
1560
1561 auto& metadata = bytecode.metadata(exec);
1562 return setUpCall(execCallee, kind, calleeAsValue, &metadata.m_callLinkInfo);
1563}
1564
1565LLINT_SLOW_PATH_DECL(slow_path_call)
1566{
1567 LLINT_BEGIN_NO_SET_PC();
1568 RELEASE_AND_RETURN(throwScope, genericCall(exec, pc->as<OpCall>(), CodeForCall));
1569}
1570
1571LLINT_SLOW_PATH_DECL(slow_path_tail_call)
1572{
1573 LLINT_BEGIN_NO_SET_PC();
1574 RELEASE_AND_RETURN(throwScope, genericCall(exec, pc->as<OpTailCall>(), CodeForCall));
1575}
1576
1577LLINT_SLOW_PATH_DECL(slow_path_construct)
1578{
1579 LLINT_BEGIN_NO_SET_PC();
1580 RELEASE_AND_RETURN(throwScope, genericCall(exec, pc->as<OpConstruct>(), CodeForConstruct));
1581}
1582
1583LLINT_SLOW_PATH_DECL(slow_path_size_frame_for_varargs)
1584{
1585 LLINT_BEGIN();
1586 // This needs to:
1587 // - Set up a call frame while respecting the variable arguments.
1588
1589 unsigned numUsedStackSlots;
1590 JSValue arguments;
1591 int firstVarArg;
1592 switch (pc->opcodeID()) {
1593 case op_call_varargs: {
1594 auto bytecode = pc->as<OpCallVarargs>();
1595 numUsedStackSlots = -bytecode.m_firstFree.offset();
1596 arguments = getOperand(exec, bytecode.m_arguments);
1597 firstVarArg = bytecode.m_firstVarArg;
1598 break;
1599 }
1600 case op_tail_call_varargs: {
1601 auto bytecode = pc->as<OpTailCallVarargs>();
1602 numUsedStackSlots = -bytecode.m_firstFree.offset();
1603 arguments = getOperand(exec, bytecode.m_arguments);
1604 firstVarArg = bytecode.m_firstVarArg;
1605 break;
1606 }
1607 case op_construct_varargs: {
1608 auto bytecode = pc->as<OpConstructVarargs>();
1609 numUsedStackSlots = -bytecode.m_firstFree.offset();
1610 arguments = getOperand(exec, bytecode.m_arguments);
1611 firstVarArg = bytecode.m_firstVarArg;
1612 break;
1613 }
1614 default:
1615 RELEASE_ASSERT_NOT_REACHED();
1616 }
1617 unsigned length = sizeFrameForVarargs(exec, vm, arguments, numUsedStackSlots, firstVarArg);
1618 LLINT_CALL_CHECK_EXCEPTION(exec, exec);
1619
1620 ExecState* execCallee = calleeFrameForVarargs(exec, numUsedStackSlots, length + 1);
1621 vm.varargsLength = length;
1622 vm.newCallFrameReturnValue = execCallee;
1623
1624 LLINT_RETURN_CALLEE_FRAME(execCallee);
1625}
1626
1627LLINT_SLOW_PATH_DECL(slow_path_size_frame_for_forward_arguments)
1628{
1629 LLINT_BEGIN();
1630 // This needs to:
1631 // - Set up a call frame with the same arguments as the current frame.
1632
1633 auto bytecode = pc->as<OpTailCallForwardArguments>();
1634 unsigned numUsedStackSlots = -bytecode.m_firstFree.offset();
1635
1636 unsigned arguments = sizeFrameForForwardArguments(exec, vm, numUsedStackSlots);
1637 LLINT_CALL_CHECK_EXCEPTION(exec, exec);
1638
1639 ExecState* execCallee = calleeFrameForVarargs(exec, numUsedStackSlots, arguments + 1);
1640
1641 vm.varargsLength = arguments;
1642 vm.newCallFrameReturnValue = execCallee;
1643
1644 LLINT_RETURN_CALLEE_FRAME(execCallee);
1645}
1646
1647enum class SetArgumentsWith {
1648 Object,
1649 CurrentArguments
1650};
1651
1652template<typename Op>
1653inline SlowPathReturnType varargsSetup(ExecState* exec, const Instruction* pc, CodeSpecializationKind kind, SetArgumentsWith set)
1654{
1655 LLINT_BEGIN_NO_SET_PC();
1656 // This needs to:
1657 // - Figure out what to call and compile it if necessary.
1658 // - Return a tuple of machine code address to call and the new call frame.
1659
1660 auto bytecode = pc->as<Op>();
1661 JSValue calleeAsValue = getOperand(exec, bytecode.m_callee);
1662
1663 ExecState* execCallee = vm.newCallFrameReturnValue;
1664
1665 if (set == SetArgumentsWith::Object) {
1666 setupVarargsFrameAndSetThis(exec, execCallee, getOperand(exec, bytecode.m_thisValue), getOperand(exec, bytecode.m_arguments), bytecode.m_firstVarArg, vm.varargsLength);
1667 LLINT_CALL_CHECK_EXCEPTION(exec, exec);
1668 } else
1669 setupForwardArgumentsFrameAndSetThis(exec, execCallee, getOperand(exec, bytecode.m_thisValue), vm.varargsLength);
1670
1671 execCallee->setCallerFrame(exec);
1672 execCallee->uncheckedR(CallFrameSlot::callee) = calleeAsValue;
1673 exec->setCurrentVPC(pc);
1674
1675 RELEASE_AND_RETURN(throwScope, setUpCall(execCallee, kind, calleeAsValue));
1676}
1677
1678LLINT_SLOW_PATH_DECL(slow_path_call_varargs)
1679{
1680 return varargsSetup<OpCallVarargs>(exec, pc, CodeForCall, SetArgumentsWith::Object);
1681}
1682
1683LLINT_SLOW_PATH_DECL(slow_path_tail_call_varargs)
1684{
1685 return varargsSetup<OpTailCallVarargs>(exec, pc, CodeForCall, SetArgumentsWith::Object);
1686}
1687
1688LLINT_SLOW_PATH_DECL(slow_path_tail_call_forward_arguments)
1689{
1690 return varargsSetup<OpTailCallForwardArguments>(exec, pc, CodeForCall, SetArgumentsWith::CurrentArguments);
1691}
1692
1693LLINT_SLOW_PATH_DECL(slow_path_construct_varargs)
1694{
1695 return varargsSetup<OpConstructVarargs>(exec, pc, CodeForConstruct, SetArgumentsWith::Object);
1696}
1697
1698inline SlowPathReturnType commonCallEval(ExecState* exec, const Instruction* pc, MacroAssemblerCodePtr<JSEntryPtrTag> returnPoint)
1699{
1700 LLINT_BEGIN_NO_SET_PC();
1701 auto bytecode = pc->as<OpCallEval>();
1702 JSValue calleeAsValue = getNonConstantOperand(exec, bytecode.m_callee);
1703
1704 ExecState* execCallee = exec - bytecode.m_argv;
1705
1706 execCallee->setArgumentCountIncludingThis(bytecode.m_argc);
1707 execCallee->setCallerFrame(exec);
1708 execCallee->uncheckedR(CallFrameSlot::callee) = calleeAsValue;
1709 execCallee->setReturnPC(returnPoint.executableAddress());
1710 execCallee->setCodeBlock(0);
1711 exec->setCurrentVPC(pc);
1712
1713 if (!isHostFunction(calleeAsValue, globalFuncEval))
1714 RELEASE_AND_RETURN(throwScope, setUpCall(execCallee, CodeForCall, calleeAsValue));
1715
1716 vm.hostCallReturnValue = eval(execCallee);
1717 LLINT_CALL_RETURN(exec, execCallee, LLInt::getCodePtr(getHostCallReturnValue), CFunctionPtrTag);
1718}
1719
1720LLINT_SLOW_PATH_DECL(slow_path_call_eval)
1721{
1722 return commonCallEval(exec, pc, LLInt::getCodePtr<JSEntryPtrTag>(llint_generic_return_point));
1723}
1724
1725LLINT_SLOW_PATH_DECL(slow_path_call_eval_wide16)
1726{
1727 return commonCallEval(exec, pc, LLInt::getWide16CodePtr<JSEntryPtrTag>(llint_generic_return_point));
1728}
1729
1730LLINT_SLOW_PATH_DECL(slow_path_call_eval_wide32)
1731{
1732 return commonCallEval(exec, pc, LLInt::getWide32CodePtr<JSEntryPtrTag>(llint_generic_return_point));
1733}
1734
1735LLINT_SLOW_PATH_DECL(slow_path_strcat)
1736{
1737 LLINT_BEGIN();
1738 auto bytecode = pc->as<OpStrcat>();
1739 LLINT_RETURN(jsStringFromRegisterArray(exec, &exec->uncheckedR(bytecode.m_src), bytecode.m_count));
1740}
1741
1742LLINT_SLOW_PATH_DECL(slow_path_to_primitive)
1743{
1744 LLINT_BEGIN();
1745 auto bytecode = pc->as<OpToPrimitive>();
1746 LLINT_RETURN(getOperand(exec, bytecode.m_src).toPrimitive(exec));
1747}
1748
1749LLINT_SLOW_PATH_DECL(slow_path_throw)
1750{
1751 LLINT_BEGIN();
1752 auto bytecode = pc->as<OpThrow>();
1753 LLINT_THROW(getOperand(exec, bytecode.m_value));
1754}
1755
1756LLINT_SLOW_PATH_DECL(slow_path_handle_traps)
1757{
1758 LLINT_BEGIN_NO_SET_PC();
1759 ASSERT(vm.needTrapHandling());
1760 vm.handleTraps(exec);
1761 UNUSED_PARAM(pc);
1762 LLINT_RETURN_TWO(throwScope.exception(), exec);
1763}
1764
1765LLINT_SLOW_PATH_DECL(slow_path_debug)
1766{
1767 LLINT_BEGIN();
1768 auto bytecode = pc->as<OpDebug>();
1769 vm.interpreter->debug(exec, bytecode.m_debugHookType);
1770
1771 LLINT_END();
1772}
1773
1774LLINT_SLOW_PATH_DECL(slow_path_handle_exception)
1775{
1776 LLINT_BEGIN_NO_SET_PC();
1777 UNUSED_PARAM(throwScope);
1778 genericUnwind(&vm, exec);
1779 LLINT_END_IMPL();
1780}
1781
1782LLINT_SLOW_PATH_DECL(slow_path_get_from_scope)
1783{
1784 LLINT_BEGIN();
1785 auto bytecode = pc->as<OpGetFromScope>();
1786 auto& metadata = bytecode.metadata(exec);
1787 const Identifier& ident = exec->codeBlock()->identifier(bytecode.m_var);
1788 JSObject* scope = jsCast<JSObject*>(getNonConstantOperand(exec, bytecode.m_scope));
1789
1790 // ModuleVar is always converted to ClosureVar for get_from_scope.
1791 ASSERT(metadata.m_getPutInfo.resolveType() != ModuleVar);
1792
1793 LLINT_RETURN(scope->getPropertySlot(exec, ident, [&] (bool found, PropertySlot& slot) -> JSValue {
1794 if (!found) {
1795 if (metadata.m_getPutInfo.resolveMode() == ThrowIfNotFound)
1796 return throwException(exec, throwScope, createUndefinedVariableError(exec, ident));
1797 return jsUndefined();
1798 }
1799
1800 JSValue result = JSValue();
1801 if (scope->isGlobalLexicalEnvironment()) {
1802 // When we can't statically prove we need a TDZ check, we must perform the check on the slow path.
1803 result = slot.getValue(exec, ident);
1804 if (result == jsTDZValue())
1805 return throwException(exec, throwScope, createTDZError(exec));
1806 }
1807
1808 CommonSlowPaths::tryCacheGetFromScopeGlobal(exec, vm, bytecode, scope, slot, ident);
1809
1810 if (!result)
1811 return slot.getValue(exec, ident);
1812 return result;
1813 }));
1814}
1815
1816LLINT_SLOW_PATH_DECL(slow_path_put_to_scope)
1817{
1818 LLINT_BEGIN();
1819
1820 auto bytecode = pc->as<OpPutToScope>();
1821 auto& metadata = bytecode.metadata(exec);
1822 CodeBlock* codeBlock = exec->codeBlock();
1823 const Identifier& ident = codeBlock->identifier(bytecode.m_var);
1824 JSObject* scope = jsCast<JSObject*>(getNonConstantOperand(exec, bytecode.m_scope));
1825 JSValue value = getOperand(exec, bytecode.m_value);
1826 if (metadata.m_getPutInfo.resolveType() == LocalClosureVar) {
1827 JSLexicalEnvironment* environment = jsCast<JSLexicalEnvironment*>(scope);
1828 environment->variableAt(ScopeOffset(metadata.m_operand)).set(vm, environment, value);
1829
1830 // Have to do this *after* the write, because if this puts the set into IsWatched, then we need
1831 // to have already changed the value of the variable. Otherwise we might watch and constant-fold
1832 // to the Undefined value from before the assignment.
1833 if (metadata.m_watchpointSet)
1834 metadata.m_watchpointSet->touch(vm, "Executed op_put_scope<LocalClosureVar>");
1835 LLINT_END();
1836 }
1837
1838 bool hasProperty = scope->hasProperty(exec, ident);
1839 LLINT_CHECK_EXCEPTION();
1840 if (hasProperty
1841 && scope->isGlobalLexicalEnvironment()
1842 && !isInitialization(metadata.m_getPutInfo.initializationMode())) {
1843 // When we can't statically prove we need a TDZ check, we must perform the check on the slow path.
1844 PropertySlot slot(scope, PropertySlot::InternalMethodType::Get);
1845 JSGlobalLexicalEnvironment::getOwnPropertySlot(scope, exec, ident, slot);
1846 if (slot.getValue(exec, ident) == jsTDZValue())
1847 LLINT_THROW(createTDZError(exec));
1848 }
1849
1850 if (metadata.m_getPutInfo.resolveMode() == ThrowIfNotFound && !hasProperty)
1851 LLINT_THROW(createUndefinedVariableError(exec, ident));
1852
1853 PutPropertySlot slot(scope, codeBlock->isStrictMode(), PutPropertySlot::UnknownContext, isInitialization(metadata.m_getPutInfo.initializationMode()));
1854 scope->methodTable(vm)->put(scope, exec, ident, value, slot);
1855
1856 CommonSlowPaths::tryCachePutToScopeGlobal(exec, codeBlock, bytecode, scope, slot, ident);
1857
1858 LLINT_END();
1859}
1860
1861LLINT_SLOW_PATH_DECL(slow_path_check_if_exception_is_uncatchable_and_notify_profiler)
1862{
1863 LLINT_BEGIN();
1864 RELEASE_ASSERT(!!throwScope.exception());
1865
1866 if (isTerminatedExecutionException(vm, throwScope.exception()))
1867 LLINT_RETURN_TWO(pc, bitwise_cast<void*>(static_cast<uintptr_t>(1)));
1868 LLINT_RETURN_TWO(pc, 0);
1869}
1870
1871LLINT_SLOW_PATH_DECL(slow_path_log_shadow_chicken_prologue)
1872{
1873 LLINT_BEGIN();
1874
1875 auto bytecode = pc->as<OpLogShadowChickenPrologue>();
1876 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1877 ShadowChicken* shadowChicken = vm.shadowChicken();
1878 RELEASE_ASSERT(shadowChicken);
1879 shadowChicken->log(vm, exec, ShadowChicken::Packet::prologue(exec->jsCallee(), exec, exec->callerFrame(), scope));
1880
1881 LLINT_END();
1882}
1883
1884LLINT_SLOW_PATH_DECL(slow_path_log_shadow_chicken_tail)
1885{
1886 LLINT_BEGIN();
1887
1888 auto bytecode = pc->as<OpLogShadowChickenTail>();
1889 JSValue thisValue = getNonConstantOperand(exec, bytecode.m_thisValue);
1890 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1891
1892#if USE(JSVALUE64)
1893 CallSiteIndex callSiteIndex(exec->codeBlock()->bytecodeOffset(pc));
1894#else
1895 CallSiteIndex callSiteIndex(pc);
1896#endif
1897 ShadowChicken* shadowChicken = vm.shadowChicken();
1898 RELEASE_ASSERT(shadowChicken);
1899 shadowChicken->log(vm, exec, ShadowChicken::Packet::tail(exec, thisValue, scope, exec->codeBlock(), callSiteIndex));
1900
1901 LLINT_END();
1902}
1903
1904LLINT_SLOW_PATH_DECL(slow_path_profile_catch)
1905{
1906 LLINT_BEGIN();
1907
1908 exec->codeBlock()->ensureCatchLivenessIsComputedForBytecodeOffset(exec->bytecodeOffset());
1909
1910 auto bytecode = pc->as<OpCatch>();
1911 auto& metadata = bytecode.metadata(exec);
1912 metadata.m_buffer->forEach([&] (ValueProfileAndOperand& profile) {
1913 profile.m_buckets[0] = JSValue::encode(exec->uncheckedR(profile.m_operand).jsValue());
1914 });
1915
1916 LLINT_END();
1917}
1918
1919LLINT_SLOW_PATH_DECL(slow_path_super_sampler_begin)
1920{
1921 // FIXME: It seems like we should be able to do this in asm but llint doesn't seem to like global variables.
1922 // See: https://bugs.webkit.org/show_bug.cgi?id=179438
1923 UNUSED_PARAM(exec);
1924 g_superSamplerCount++;
1925 LLINT_END_IMPL();
1926}
1927
1928LLINT_SLOW_PATH_DECL(slow_path_super_sampler_end)
1929{
1930 // FIXME: It seems like we should be able to do this in asm but llint doesn't seem to like global variables.
1931 // See: https://bugs.webkit.org/show_bug.cgi?id=179438
1932 UNUSED_PARAM(exec);
1933 g_superSamplerCount--;
1934 LLINT_END_IMPL();
1935}
1936
1937LLINT_SLOW_PATH_DECL(slow_path_out_of_line_jump_target)
1938{
1939 CodeBlock* codeBlock = exec->codeBlock();
1940 pc = codeBlock->outOfLineJumpTarget(pc);
1941 LLINT_END_IMPL();
1942}
1943
1944extern "C" SlowPathReturnType llint_throw_stack_overflow_error(VM* vm, ProtoCallFrame* protoFrame)
1945{
1946 ExecState* exec = vm->topCallFrame;
1947 auto scope = DECLARE_THROW_SCOPE(*vm);
1948
1949 if (!exec)
1950 exec = protoFrame->callee()->globalObject(*vm)->globalExec();
1951 throwStackOverflowError(exec, scope);
1952 return encodeResult(0, 0);
1953}
1954
1955#if ENABLE(C_LOOP)
1956extern "C" SlowPathReturnType llint_stack_check_at_vm_entry(VM* vm, Register* newTopOfStack)
1957{
1958 bool success = vm->ensureStackCapacityFor(newTopOfStack);
1959 return encodeResult(reinterpret_cast<void*>(success), 0);
1960}
1961#endif
1962
1963extern "C" void llint_write_barrier_slow(ExecState* exec, JSCell* cell)
1964{
1965 VM& vm = exec->vm();
1966 vm.heap.writeBarrier(cell);
1967}
1968
1969extern "C" NO_RETURN_DUE_TO_CRASH void llint_crash()
1970{
1971 CRASH();
1972}
1973
1974} } // namespace JSC::LLInt
1975