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->instructionCount())
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 JITCode::BaselineJIT: {
387 if (Options::verboseOSR())
388 dataLogF(" Code was already compiled.\n");
389 codeBlock->jitSoon();
390 return true;
391 }
392 case JITCode::InterpreterThunk: {
393 JITWorklist::ensureGlobalWorklist().compileLater(codeBlock, loopOSREntryBytecodeOffset);
394 return codeBlock->jitType() == JITCode::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() == JITCode::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 PropertyOffset offset = invalidOffset;
723 CodeBlock::StructureWatchpointMap& watchpointMap = codeBlock->llintGetByIdWatchpointMap();
724 Bag<LLIntPrototypeLoadAdaptiveStructureWatchpoint> watchpoints;
725 for (ObjectPropertyCondition condition : conditions) {
726 if (!condition.isWatchable())
727 return;
728 if (condition.condition().kind() == PropertyCondition::Presence)
729 offset = condition.condition().offset();
730 watchpoints.add(codeBlock, condition, metadata)->install(vm);
731 }
732
733 ASSERT((offset == invalidOffset) == slot.isUnset());
734 auto result = watchpointMap.add(std::make_tuple(structure, pc), WTFMove(watchpoints));
735 ASSERT_UNUSED(result, result.isNewEntry);
736
737 ConcurrentJSLocker locker(codeBlock->m_lock);
738
739 if (slot.isUnset()) {
740 metadata.m_mode = GetByIdMode::Unset;
741 metadata.m_modeMetadata.unsetMode.structureID = structure->id();
742 return;
743 }
744 ASSERT(slot.isValue());
745
746 metadata.m_mode = GetByIdMode::ProtoLoad;
747 metadata.m_modeMetadata.protoLoadMode.structureID = structure->id();
748 metadata.m_modeMetadata.protoLoadMode.cachedOffset = offset;
749 metadata.m_modeMetadata.protoLoadMode.cachedSlot = slot.slotBase();
750 // We know that this pointer will remain valid because it will be cleared by either a watchpoint fire or
751 // during GC when we clear the LLInt caches.
752 metadata.m_modeMetadata.protoLoadMode.cachedSlot = slot.slotBase();
753}
754
755
756LLINT_SLOW_PATH_DECL(slow_path_get_by_id)
757{
758 LLINT_BEGIN();
759 auto bytecode = pc->as<OpGetById>();
760 auto& metadata = bytecode.metadata(exec);
761 CodeBlock* codeBlock = exec->codeBlock();
762 const Identifier& ident = codeBlock->identifier(bytecode.m_property);
763 JSValue baseValue = getOperand(exec, bytecode.m_base);
764 PropertySlot slot(baseValue, PropertySlot::PropertySlot::InternalMethodType::Get);
765
766 JSValue result = baseValue.get(exec, ident, slot);
767 LLINT_CHECK_EXCEPTION();
768 exec->uncheckedR(bytecode.m_dst) = result;
769
770 if (!LLINT_ALWAYS_ACCESS_SLOW
771 && baseValue.isCell()
772 && slot.isCacheable()) {
773 {
774 StructureID oldStructureID;
775 auto mode = metadata.m_mode;
776 switch (mode) {
777 case GetByIdMode::Default:
778 oldStructureID = metadata.m_modeMetadata.defaultMode.structureID;
779 break;
780 case GetByIdMode::Unset:
781 oldStructureID = metadata.m_modeMetadata.unsetMode.structureID;
782 break;
783 case GetByIdMode::ProtoLoad:
784 oldStructureID = metadata.m_modeMetadata.protoLoadMode.structureID;
785 break;
786 default:
787 oldStructureID = 0;
788 }
789 if (oldStructureID) {
790 Structure* a = vm.heap.structureIDTable().get(oldStructureID);
791 Structure* b = baseValue.asCell()->structure(vm);
792
793 if (Structure::shouldConvertToPolyProto(a, b)) {
794 ASSERT(a->rareData()->sharedPolyProtoWatchpoint().get() == b->rareData()->sharedPolyProtoWatchpoint().get());
795 a->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
796 }
797 }
798 }
799
800 JSCell* baseCell = baseValue.asCell();
801 Structure* structure = baseCell->structure(vm);
802 if (slot.isValue() && slot.slotBase() == baseValue) {
803 // Start out by clearing out the old cache.
804 metadata.m_mode = GetByIdMode::Default;
805 metadata.m_modeMetadata.defaultMode.structureID = 0;
806 metadata.m_modeMetadata.defaultMode.cachedOffset = 0;
807
808 // Prevent the prototype cache from ever happening.
809 metadata.m_hitCountForLLIntCaching = 0;
810
811 if (structure->propertyAccessesAreCacheable()
812 && !structure->needImpurePropertyWatchpoint()) {
813 vm.heap.writeBarrier(codeBlock);
814
815 ConcurrentJSLocker locker(codeBlock->m_lock);
816
817 metadata.m_modeMetadata.defaultMode.structureID = structure->id();
818 metadata.m_modeMetadata.defaultMode.cachedOffset = slot.cachedOffset();
819 }
820 } else if (UNLIKELY(metadata.m_hitCountForLLIntCaching && (slot.isValue() || slot.isUnset()))) {
821 ASSERT(slot.slotBase() != baseValue);
822
823 if (!(--metadata.m_hitCountForLLIntCaching))
824 setupGetByIdPrototypeCache(exec, vm, pc, metadata, baseCell, slot, ident);
825 }
826 } else if (!LLINT_ALWAYS_ACCESS_SLOW
827 && isJSArray(baseValue)
828 && ident == vm.propertyNames->length) {
829 metadata.m_mode = GetByIdMode::ArrayLength;
830 new (&metadata.m_modeMetadata.arrayLengthMode.arrayProfile) ArrayProfile(codeBlock->bytecodeOffset(pc));
831 metadata.m_modeMetadata.arrayLengthMode.arrayProfile.observeStructure(baseValue.asCell()->structure(vm));
832
833 // Prevent the prototype cache from ever happening.
834 metadata.m_hitCountForLLIntCaching = 0;
835 }
836
837 LLINT_PROFILE_VALUE(result);
838 LLINT_END();
839}
840
841LLINT_SLOW_PATH_DECL(slow_path_put_by_id)
842{
843 LLINT_BEGIN();
844 auto bytecode = pc->as<OpPutById>();
845 auto& metadata = bytecode.metadata(exec);
846 CodeBlock* codeBlock = exec->codeBlock();
847 const Identifier& ident = codeBlock->identifier(bytecode.m_property);
848
849 JSValue baseValue = getOperand(exec, bytecode.m_base);
850 PutPropertySlot slot(baseValue, codeBlock->isStrictMode(), codeBlock->putByIdContext());
851 if (bytecode.m_flags & PutByIdIsDirect)
852 CommonSlowPaths::putDirectWithReify(vm, exec, asObject(baseValue), ident, getOperand(exec, bytecode.m_value), slot);
853 else
854 baseValue.putInline(exec, ident, getOperand(exec, bytecode.m_value), slot);
855 LLINT_CHECK_EXCEPTION();
856
857 if (!LLINT_ALWAYS_ACCESS_SLOW
858 && baseValue.isCell()
859 && slot.isCacheablePut()) {
860
861 {
862 StructureID oldStructureID = metadata.m_oldStructureID;
863 if (oldStructureID) {
864 Structure* a = vm.heap.structureIDTable().get(oldStructureID);
865 Structure* b = baseValue.asCell()->structure(vm);
866 if (slot.type() == PutPropertySlot::NewProperty)
867 b = b->previousID();
868
869 if (Structure::shouldConvertToPolyProto(a, b)) {
870 a->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
871 b->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));
872 }
873 }
874 }
875
876 // Start out by clearing out the old cache.
877 metadata.m_oldStructureID = 0;
878 metadata.m_offset = 0;
879 metadata.m_newStructureID = 0;
880 metadata.m_structureChain.clear();
881
882 JSCell* baseCell = baseValue.asCell();
883 Structure* structure = baseCell->structure(vm);
884
885 if (!structure->isUncacheableDictionary()
886 && !structure->typeInfo().prohibitsPropertyCaching()
887 && baseCell == slot.base()) {
888
889 vm.heap.writeBarrier(codeBlock);
890
891 if (slot.type() == PutPropertySlot::NewProperty) {
892 GCSafeConcurrentJSLocker locker(codeBlock->m_lock, vm.heap);
893
894 if (!structure->isDictionary() && structure->previousID()->outOfLineCapacity() == structure->outOfLineCapacity()) {
895 ASSERT(structure->previousID()->transitionWatchpointSetHasBeenInvalidated());
896
897 bool sawPolyProto = false;
898 auto result = normalizePrototypeChain(exec, baseCell, sawPolyProto);
899 if (result != InvalidPrototypeChain && !sawPolyProto) {
900 ASSERT(structure->previousID()->isObject());
901 metadata.m_oldStructureID = structure->previousID()->id();
902 metadata.m_offset = slot.cachedOffset();
903 metadata.m_newStructureID = structure->id();
904 if (!(bytecode.m_flags & PutByIdIsDirect)) {
905 StructureChain* chain = structure->prototypeChain(exec, asObject(baseCell));
906 ASSERT(chain);
907 metadata.m_structureChain.set(vm, codeBlock, chain);
908 }
909 }
910 }
911 } else {
912 structure->didCachePropertyReplacement(vm, slot.cachedOffset());
913 metadata.m_oldStructureID = structure->id();
914 metadata.m_offset = slot.cachedOffset();
915 }
916 }
917 }
918
919 LLINT_END();
920}
921
922LLINT_SLOW_PATH_DECL(slow_path_del_by_id)
923{
924 LLINT_BEGIN();
925 auto bytecode = pc->as<OpDelById>();
926 CodeBlock* codeBlock = exec->codeBlock();
927 JSObject* baseObject = getOperand(exec, bytecode.m_base).toObject(exec);
928 LLINT_CHECK_EXCEPTION();
929 bool couldDelete = baseObject->methodTable(vm)->deleteProperty(baseObject, exec, codeBlock->identifier(bytecode.m_property));
930 LLINT_CHECK_EXCEPTION();
931 if (!couldDelete && codeBlock->isStrictMode())
932 LLINT_THROW(createTypeError(exec, UnableToDeletePropertyError));
933 LLINT_RETURN(jsBoolean(couldDelete));
934}
935
936static ALWAYS_INLINE JSValue getByVal(VM& vm, ExecState* exec, OpGetByVal bytecode)
937{
938 JSValue baseValue = getOperand(exec, bytecode.m_base);
939 JSValue subscript = getOperand(exec, bytecode.m_property);
940 auto scope = DECLARE_THROW_SCOPE(vm);
941
942 if (LIKELY(baseValue.isCell() && subscript.isString())) {
943 Structure& structure = *baseValue.asCell()->structure(vm);
944 if (JSCell::canUseFastGetOwnProperty(structure)) {
945 RefPtr<AtomicStringImpl> existingAtomicString = asString(subscript)->toExistingAtomicString(exec);
946 RETURN_IF_EXCEPTION(scope, JSValue());
947 if (existingAtomicString) {
948 if (JSValue result = baseValue.asCell()->fastGetOwnProperty(vm, structure, existingAtomicString.get()))
949 return result;
950 }
951 }
952 }
953
954 if (subscript.isUInt32()) {
955 uint32_t i = subscript.asUInt32();
956 auto& metadata = bytecode.metadata(exec);
957 ArrayProfile* arrayProfile = &metadata.m_arrayProfile;
958
959 if (isJSString(baseValue)) {
960 if (asString(baseValue)->canGetIndex(i)) {
961 scope.release();
962 return asString(baseValue)->getIndex(exec, i);
963 }
964 arrayProfile->setOutOfBounds();
965 } else if (baseValue.isObject()) {
966 JSObject* object = asObject(baseValue);
967 if (object->canGetIndexQuickly(i))
968 return object->getIndexQuickly(i);
969
970 bool skipMarkingOutOfBounds = false;
971
972 if (object->indexingType() == ArrayWithContiguous && i < object->butterfly()->publicLength()) {
973 // FIXME: expand this to ArrayStorage, Int32, and maybe Double:
974 // https://bugs.webkit.org/show_bug.cgi?id=182940
975 auto* globalObject = object->globalObject(vm);
976 skipMarkingOutOfBounds = globalObject->isOriginalArrayStructure(object->structure(vm)) && globalObject->arrayPrototypeChainIsSane();
977 }
978
979 if (!skipMarkingOutOfBounds && !CommonSlowPaths::canAccessArgumentIndexQuickly(*object, i))
980 arrayProfile->setOutOfBounds();
981 }
982
983 scope.release();
984 return baseValue.get(exec, i);
985 }
986
987 baseValue.requireObjectCoercible(exec);
988 RETURN_IF_EXCEPTION(scope, JSValue());
989 auto property = subscript.toPropertyKey(exec);
990 RETURN_IF_EXCEPTION(scope, JSValue());
991 scope.release();
992 return baseValue.get(exec, property);
993}
994
995LLINT_SLOW_PATH_DECL(slow_path_get_by_val)
996{
997 LLINT_BEGIN();
998 auto bytecode = pc->as<OpGetByVal>();
999 LLINT_RETURN_PROFILED(getByVal(vm, exec, bytecode));
1000}
1001
1002LLINT_SLOW_PATH_DECL(slow_path_put_by_val)
1003{
1004 LLINT_BEGIN();
1005
1006 auto bytecode = pc->as<OpPutByVal>();
1007 JSValue baseValue = getOperand(exec, bytecode.m_base);
1008 JSValue subscript = getOperand(exec, bytecode.m_property);
1009 JSValue value = getOperand(exec, bytecode.m_value);
1010 bool isStrictMode = exec->codeBlock()->isStrictMode();
1011
1012 if (LIKELY(subscript.isUInt32())) {
1013 uint32_t i = subscript.asUInt32();
1014 if (baseValue.isObject()) {
1015 JSObject* object = asObject(baseValue);
1016 if (object->canSetIndexQuickly(i))
1017 object->setIndexQuickly(vm, i, value);
1018 else
1019 object->methodTable(vm)->putByIndex(object, exec, i, value, isStrictMode);
1020 LLINT_END();
1021 }
1022 baseValue.putByIndex(exec, i, value, isStrictMode);
1023 LLINT_END();
1024 }
1025
1026 auto property = subscript.toPropertyKey(exec);
1027 LLINT_CHECK_EXCEPTION();
1028 PutPropertySlot slot(baseValue, isStrictMode);
1029 baseValue.put(exec, property, value, slot);
1030 LLINT_END();
1031}
1032
1033LLINT_SLOW_PATH_DECL(slow_path_put_by_val_direct)
1034{
1035 LLINT_BEGIN();
1036
1037 auto bytecode = pc->as<OpPutByValDirect>();
1038 JSValue baseValue = getOperand(exec, bytecode.m_base);
1039 JSValue subscript = getOperand(exec, bytecode.m_property);
1040 JSValue value = getOperand(exec, bytecode.m_value);
1041 RELEASE_ASSERT(baseValue.isObject());
1042 JSObject* baseObject = asObject(baseValue);
1043 bool isStrictMode = exec->codeBlock()->isStrictMode();
1044 if (LIKELY(subscript.isUInt32())) {
1045 // Despite its name, JSValue::isUInt32 will return true only for positive boxed int32_t; all those values are valid array indices.
1046 ASSERT(isIndex(subscript.asUInt32()));
1047 baseObject->putDirectIndex(exec, subscript.asUInt32(), value, 0, isStrictMode ? PutDirectIndexShouldThrow : PutDirectIndexShouldNotThrow);
1048 LLINT_END();
1049 }
1050
1051 if (subscript.isDouble()) {
1052 double subscriptAsDouble = subscript.asDouble();
1053 uint32_t subscriptAsUInt32 = static_cast<uint32_t>(subscriptAsDouble);
1054 if (subscriptAsDouble == subscriptAsUInt32 && isIndex(subscriptAsUInt32)) {
1055 baseObject->putDirectIndex(exec, subscriptAsUInt32, value, 0, isStrictMode ? PutDirectIndexShouldThrow : PutDirectIndexShouldNotThrow);
1056 LLINT_END();
1057 }
1058 }
1059
1060 // Don't put to an object if toString threw an exception.
1061 auto property = subscript.toPropertyKey(exec);
1062 if (UNLIKELY(throwScope.exception()))
1063 LLINT_END();
1064
1065 if (Optional<uint32_t> index = parseIndex(property))
1066 baseObject->putDirectIndex(exec, index.value(), value, 0, isStrictMode ? PutDirectIndexShouldThrow : PutDirectIndexShouldNotThrow);
1067 else {
1068 PutPropertySlot slot(baseObject, isStrictMode);
1069 CommonSlowPaths::putDirectWithReify(vm, exec, baseObject, property, value, slot);
1070 }
1071 LLINT_END();
1072}
1073
1074LLINT_SLOW_PATH_DECL(slow_path_del_by_val)
1075{
1076 LLINT_BEGIN();
1077 auto bytecode = pc->as<OpDelByVal>();
1078 JSValue baseValue = getOperand(exec, bytecode.m_base);
1079 JSObject* baseObject = baseValue.toObject(exec);
1080 LLINT_CHECK_EXCEPTION();
1081
1082 JSValue subscript = getOperand(exec, bytecode.m_property);
1083
1084 bool couldDelete;
1085
1086 uint32_t i;
1087 if (subscript.getUInt32(i))
1088 couldDelete = baseObject->methodTable(vm)->deletePropertyByIndex(baseObject, exec, i);
1089 else {
1090 LLINT_CHECK_EXCEPTION();
1091 auto property = subscript.toPropertyKey(exec);
1092 LLINT_CHECK_EXCEPTION();
1093 couldDelete = baseObject->methodTable(vm)->deleteProperty(baseObject, exec, property);
1094 }
1095 LLINT_CHECK_EXCEPTION();
1096
1097 if (!couldDelete && exec->codeBlock()->isStrictMode())
1098 LLINT_THROW(createTypeError(exec, UnableToDeletePropertyError));
1099
1100 LLINT_RETURN(jsBoolean(couldDelete));
1101}
1102
1103LLINT_SLOW_PATH_DECL(slow_path_put_getter_by_id)
1104{
1105 LLINT_BEGIN();
1106 auto bytecode = pc->as<OpPutGetterById>();
1107 ASSERT(getNonConstantOperand(exec, bytecode.m_base).isObject());
1108 JSObject* baseObj = asObject(getNonConstantOperand(exec, bytecode.m_base));
1109
1110 unsigned options = bytecode.m_attributes;
1111
1112 JSValue getter = getNonConstantOperand(exec, bytecode.m_accessor);
1113 ASSERT(getter.isObject());
1114
1115 baseObj->putGetter(exec, exec->codeBlock()->identifier(bytecode.m_property), asObject(getter), options);
1116 LLINT_END();
1117}
1118
1119LLINT_SLOW_PATH_DECL(slow_path_put_setter_by_id)
1120{
1121 LLINT_BEGIN();
1122 auto bytecode = pc->as<OpPutSetterById>();
1123 ASSERT(getNonConstantOperand(exec, bytecode.m_base).isObject());
1124 JSObject* baseObj = asObject(getNonConstantOperand(exec, bytecode.m_base));
1125
1126 unsigned options = bytecode.m_attributes;
1127
1128 JSValue setter = getNonConstantOperand(exec, bytecode.m_accessor);
1129 ASSERT(setter.isObject());
1130
1131 baseObj->putSetter(exec, exec->codeBlock()->identifier(bytecode.m_property), asObject(setter), options);
1132 LLINT_END();
1133}
1134
1135LLINT_SLOW_PATH_DECL(slow_path_put_getter_setter_by_id)
1136{
1137 LLINT_BEGIN();
1138 auto bytecode = pc->as<OpPutGetterSetterById>();
1139 ASSERT(getNonConstantOperand(exec, bytecode.m_base).isObject());
1140 JSObject* baseObject = asObject(getNonConstantOperand(exec, bytecode.m_base));
1141
1142 JSValue getter = getNonConstantOperand(exec, bytecode.m_getter);
1143 JSValue setter = getNonConstantOperand(exec, bytecode.m_setter);
1144 ASSERT(getter.isObject() || setter.isObject());
1145 GetterSetter* accessor = GetterSetter::create(vm, exec->lexicalGlobalObject(), getter, setter);
1146
1147 CommonSlowPaths::putDirectAccessorWithReify(vm, exec, baseObject, exec->codeBlock()->identifier(bytecode.m_property), accessor, bytecode.m_attributes);
1148 LLINT_END();
1149}
1150
1151LLINT_SLOW_PATH_DECL(slow_path_put_getter_by_val)
1152{
1153 LLINT_BEGIN();
1154 auto bytecode = pc->as<OpPutGetterByVal>();
1155 ASSERT(getNonConstantOperand(exec, bytecode.m_base).isObject());
1156 JSObject* baseObj = asObject(getNonConstantOperand(exec, bytecode.m_base));
1157 JSValue subscript = getOperand(exec, bytecode.m_property);
1158
1159 unsigned options = bytecode.m_attributes;
1160
1161 JSValue getter = getNonConstantOperand(exec, bytecode.m_accessor);
1162 ASSERT(getter.isObject());
1163
1164 auto property = subscript.toPropertyKey(exec);
1165 LLINT_CHECK_EXCEPTION();
1166
1167 baseObj->putGetter(exec, property, asObject(getter), options);
1168 LLINT_END();
1169}
1170
1171LLINT_SLOW_PATH_DECL(slow_path_put_setter_by_val)
1172{
1173 LLINT_BEGIN();
1174 auto bytecode = pc->as<OpPutSetterByVal>();
1175 ASSERT(getNonConstantOperand(exec, bytecode.m_base).isObject());
1176 JSObject* baseObj = asObject(getNonConstantOperand(exec, bytecode.m_base));
1177 JSValue subscript = getOperand(exec, bytecode.m_property);
1178
1179 unsigned options = bytecode.m_attributes;
1180
1181 JSValue setter = getNonConstantOperand(exec, bytecode.m_accessor);
1182 ASSERT(setter.isObject());
1183
1184 auto property = subscript.toPropertyKey(exec);
1185 LLINT_CHECK_EXCEPTION();
1186
1187 baseObj->putSetter(exec, property, asObject(setter), options);
1188 LLINT_END();
1189}
1190
1191LLINT_SLOW_PATH_DECL(slow_path_jtrue)
1192{
1193 LLINT_BEGIN();
1194 auto bytecode = pc->as<OpJtrue>();
1195 LLINT_BRANCH(getOperand(exec, bytecode.m_condition).toBoolean(exec));
1196}
1197
1198LLINT_SLOW_PATH_DECL(slow_path_jfalse)
1199{
1200 LLINT_BEGIN();
1201 auto bytecode = pc->as<OpJfalse>();
1202 LLINT_BRANCH(!getOperand(exec, bytecode.m_condition).toBoolean(exec));
1203}
1204
1205LLINT_SLOW_PATH_DECL(slow_path_jless)
1206{
1207 LLINT_BEGIN();
1208 auto bytecode = pc->as<OpJless>();
1209 LLINT_BRANCH(jsLess<true>(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1210}
1211
1212LLINT_SLOW_PATH_DECL(slow_path_jnless)
1213{
1214 LLINT_BEGIN();
1215 auto bytecode = pc->as<OpJnless>();
1216 LLINT_BRANCH(!jsLess<true>(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1217}
1218
1219LLINT_SLOW_PATH_DECL(slow_path_jgreater)
1220{
1221 LLINT_BEGIN();
1222 auto bytecode = pc->as<OpJgreater>();
1223 LLINT_BRANCH(jsLess<false>(exec, getOperand(exec, bytecode.m_rhs), getOperand(exec, bytecode.m_lhs)));
1224}
1225
1226LLINT_SLOW_PATH_DECL(slow_path_jngreater)
1227{
1228 LLINT_BEGIN();
1229 auto bytecode = pc->as<OpJngreater>();
1230 LLINT_BRANCH(!jsLess<false>(exec, getOperand(exec, bytecode.m_rhs), getOperand(exec, bytecode.m_lhs)));
1231}
1232
1233LLINT_SLOW_PATH_DECL(slow_path_jlesseq)
1234{
1235 LLINT_BEGIN();
1236 auto bytecode = pc->as<OpJlesseq>();
1237 LLINT_BRANCH(jsLessEq<true>(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1238}
1239
1240LLINT_SLOW_PATH_DECL(slow_path_jnlesseq)
1241{
1242 LLINT_BEGIN();
1243 auto bytecode = pc->as<OpJnlesseq>();
1244 LLINT_BRANCH(!jsLessEq<true>(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1245}
1246
1247LLINT_SLOW_PATH_DECL(slow_path_jgreatereq)
1248{
1249 LLINT_BEGIN();
1250 auto bytecode = pc->as<OpJgreatereq>();
1251 LLINT_BRANCH(jsLessEq<false>(exec, getOperand(exec, bytecode.m_rhs), getOperand(exec, bytecode.m_lhs)));
1252}
1253
1254LLINT_SLOW_PATH_DECL(slow_path_jngreatereq)
1255{
1256 LLINT_BEGIN();
1257 auto bytecode = pc->as<OpJngreatereq>();
1258 LLINT_BRANCH(!jsLessEq<false>(exec, getOperand(exec, bytecode.m_rhs), getOperand(exec, bytecode.m_lhs)));
1259}
1260
1261LLINT_SLOW_PATH_DECL(slow_path_jeq)
1262{
1263 LLINT_BEGIN();
1264 auto bytecode = pc->as<OpJeq>();
1265 LLINT_BRANCH(JSValue::equal(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1266}
1267
1268LLINT_SLOW_PATH_DECL(slow_path_jneq)
1269{
1270 LLINT_BEGIN();
1271 auto bytecode = pc->as<OpJneq>();
1272 LLINT_BRANCH(!JSValue::equal(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1273}
1274
1275LLINT_SLOW_PATH_DECL(slow_path_jstricteq)
1276{
1277 LLINT_BEGIN();
1278 auto bytecode = pc->as<OpJstricteq>();
1279 LLINT_BRANCH(JSValue::strictEqual(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1280}
1281
1282LLINT_SLOW_PATH_DECL(slow_path_jnstricteq)
1283{
1284 LLINT_BEGIN();
1285 auto bytecode = pc->as<OpJnstricteq>();
1286 LLINT_BRANCH(!JSValue::strictEqual(exec, getOperand(exec, bytecode.m_lhs), getOperand(exec, bytecode.m_rhs)));
1287}
1288
1289LLINT_SLOW_PATH_DECL(slow_path_switch_imm)
1290{
1291 LLINT_BEGIN();
1292 auto bytecode = pc->as<OpSwitchImm>();
1293 JSValue scrutinee = getOperand(exec, bytecode.m_scrutinee);
1294 ASSERT(scrutinee.isDouble());
1295 double value = scrutinee.asDouble();
1296 int32_t intValue = static_cast<int32_t>(value);
1297 int defaultOffset = JUMP_OFFSET(bytecode.m_defaultOffset);
1298 if (value == intValue) {
1299 CodeBlock* codeBlock = exec->codeBlock();
1300 JUMP_TO(codeBlock->switchJumpTable(bytecode.m_tableIndex).offsetForValue(intValue, defaultOffset));
1301 } else
1302 JUMP_TO(defaultOffset);
1303 LLINT_END();
1304}
1305
1306LLINT_SLOW_PATH_DECL(slow_path_switch_char)
1307{
1308 LLINT_BEGIN();
1309 auto bytecode = pc->as<OpSwitchChar>();
1310 JSValue scrutinee = getOperand(exec, bytecode.m_scrutinee);
1311 ASSERT(scrutinee.isString());
1312 JSString* string = asString(scrutinee);
1313 ASSERT(string->length() == 1);
1314 int defaultOffset = JUMP_OFFSET(bytecode.m_defaultOffset);
1315 StringImpl* impl = string->value(exec).impl();
1316 CodeBlock* codeBlock = exec->codeBlock();
1317 JUMP_TO(codeBlock->switchJumpTable(bytecode.m_tableIndex).offsetForValue((*impl)[0], defaultOffset));
1318 LLINT_END();
1319}
1320
1321LLINT_SLOW_PATH_DECL(slow_path_switch_string)
1322{
1323 LLINT_BEGIN();
1324 auto bytecode = pc->as<OpSwitchString>();
1325 JSValue scrutinee = getOperand(exec, bytecode.m_scrutinee);
1326 int defaultOffset = JUMP_OFFSET(bytecode.m_defaultOffset);
1327 if (!scrutinee.isString())
1328 JUMP_TO(defaultOffset);
1329 else {
1330 CodeBlock* codeBlock = exec->codeBlock();
1331 JUMP_TO(codeBlock->stringSwitchJumpTable(bytecode.m_tableIndex).offsetForValue(asString(scrutinee)->value(exec).impl(), defaultOffset));
1332 }
1333 LLINT_END();
1334}
1335
1336LLINT_SLOW_PATH_DECL(slow_path_new_func)
1337{
1338 LLINT_BEGIN();
1339 auto bytecode = pc->as<OpNewFunc>();
1340 CodeBlock* codeBlock = exec->codeBlock();
1341 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1342 slowPathLogF("Creating function!\n");
1343 LLINT_RETURN(JSFunction::create(vm, codeBlock->functionDecl(bytecode.m_functionDecl), scope));
1344}
1345
1346LLINT_SLOW_PATH_DECL(slow_path_new_generator_func)
1347{
1348 LLINT_BEGIN();
1349 auto bytecode = pc->as<OpNewGeneratorFunc>();
1350 CodeBlock* codeBlock = exec->codeBlock();
1351 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1352 slowPathLogF("Creating function!\n");
1353 LLINT_RETURN(JSGeneratorFunction::create(vm, codeBlock->functionDecl(bytecode.m_functionDecl), scope));
1354}
1355
1356LLINT_SLOW_PATH_DECL(slow_path_new_async_func)
1357{
1358 LLINT_BEGIN();
1359 auto bytecode = pc->as<OpNewAsyncFunc>();
1360 CodeBlock* codeBlock = exec->codeBlock();
1361 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1362 slowPathLogF("Creating async function!\n");
1363 LLINT_RETURN(JSAsyncFunction::create(vm, codeBlock->functionDecl(bytecode.m_functionDecl), scope));
1364}
1365
1366LLINT_SLOW_PATH_DECL(slow_path_new_async_generator_func)
1367{
1368 LLINT_BEGIN();
1369 auto bytecode = pc->as<OpNewAsyncGeneratorFunc>();
1370 CodeBlock* codeBlock = exec->codeBlock();
1371 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1372 slowPathLogF("Creating async generator function!\n");
1373 LLINT_RETURN(JSAsyncGeneratorFunction::create(vm, codeBlock->functionDecl(bytecode.m_functionDecl), scope));
1374}
1375
1376LLINT_SLOW_PATH_DECL(slow_path_new_func_exp)
1377{
1378 LLINT_BEGIN();
1379
1380 auto bytecode = pc->as<OpNewFuncExp>();
1381 CodeBlock* codeBlock = exec->codeBlock();
1382 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1383 FunctionExecutable* executable = codeBlock->functionExpr(bytecode.m_functionDecl);
1384
1385 LLINT_RETURN(JSFunction::create(vm, executable, scope));
1386}
1387
1388LLINT_SLOW_PATH_DECL(slow_path_new_generator_func_exp)
1389{
1390 LLINT_BEGIN();
1391
1392 auto bytecode = pc->as<OpNewGeneratorFuncExp>();
1393 CodeBlock* codeBlock = exec->codeBlock();
1394 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1395 FunctionExecutable* executable = codeBlock->functionExpr(bytecode.m_functionDecl);
1396
1397 LLINT_RETURN(JSGeneratorFunction::create(vm, executable, scope));
1398}
1399
1400LLINT_SLOW_PATH_DECL(slow_path_new_async_func_exp)
1401{
1402 LLINT_BEGIN();
1403
1404 auto bytecode = pc->as<OpNewAsyncFuncExp>();
1405 CodeBlock* codeBlock = exec->codeBlock();
1406 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1407 FunctionExecutable* executable = codeBlock->functionExpr(bytecode.m_functionDecl);
1408
1409 LLINT_RETURN(JSAsyncFunction::create(vm, executable, scope));
1410}
1411
1412LLINT_SLOW_PATH_DECL(slow_path_new_async_generator_func_exp)
1413{
1414 LLINT_BEGIN();
1415
1416 auto bytecode = pc->as<OpNewAsyncGeneratorFuncExp>();
1417 CodeBlock* codeBlock = exec->codeBlock();
1418 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1419 FunctionExecutable* executable = codeBlock->functionExpr(bytecode.m_functionDecl);
1420
1421 LLINT_RETURN(JSAsyncGeneratorFunction::create(vm, executable, scope));
1422}
1423
1424LLINT_SLOW_PATH_DECL(slow_path_set_function_name)
1425{
1426 LLINT_BEGIN();
1427 auto bytecode = pc->as<OpSetFunctionName>();
1428 JSFunction* func = jsCast<JSFunction*>(getNonConstantOperand(exec, bytecode.m_function));
1429 JSValue name = getOperand(exec, bytecode.m_name);
1430 func->setFunctionName(exec, name);
1431 LLINT_END();
1432}
1433
1434static SlowPathReturnType handleHostCall(ExecState* execCallee, JSValue callee, CodeSpecializationKind kind)
1435{
1436 slowPathLog("Performing host call.\n");
1437
1438 ExecState* exec = execCallee->callerFrame();
1439 VM& vm = exec->vm();
1440 auto throwScope = DECLARE_THROW_SCOPE(vm);
1441
1442 execCallee->setCodeBlock(0);
1443 execCallee->clearReturnPC();
1444
1445 if (kind == CodeForCall) {
1446 CallData callData;
1447 CallType callType = getCallData(vm, callee, callData);
1448
1449 ASSERT(callType != CallType::JS);
1450
1451 if (callType == CallType::Host) {
1452 NativeCallFrameTracer tracer(&vm, execCallee);
1453 execCallee->setCallee(asObject(callee));
1454 vm.hostCallReturnValue = JSValue::decode(callData.native.function(execCallee));
1455 LLINT_CALL_RETURN(execCallee, execCallee, LLInt::getCodePtr(getHostCallReturnValue), CFunctionPtrTag);
1456 }
1457
1458 slowPathLog("Call callee is not a function: ", callee, "\n");
1459
1460 ASSERT(callType == CallType::None);
1461 LLINT_CALL_THROW(exec, createNotAFunctionError(exec, callee));
1462 }
1463
1464 ASSERT(kind == CodeForConstruct);
1465
1466 ConstructData constructData;
1467 ConstructType constructType = getConstructData(vm, callee, constructData);
1468
1469 ASSERT(constructType != ConstructType::JS);
1470
1471 if (constructType == ConstructType::Host) {
1472 NativeCallFrameTracer tracer(&vm, execCallee);
1473 execCallee->setCallee(asObject(callee));
1474 vm.hostCallReturnValue = JSValue::decode(constructData.native.function(execCallee));
1475 LLINT_CALL_RETURN(execCallee, execCallee, LLInt::getCodePtr(getHostCallReturnValue), CFunctionPtrTag);
1476 }
1477
1478 slowPathLog("Constructor callee is not a function: ", callee, "\n");
1479
1480 ASSERT(constructType == ConstructType::None);
1481 LLINT_CALL_THROW(exec, createNotAConstructorError(exec, callee));
1482}
1483
1484inline SlowPathReturnType setUpCall(ExecState* execCallee, CodeSpecializationKind kind, JSValue calleeAsValue, LLIntCallLinkInfo* callLinkInfo = nullptr)
1485{
1486 ExecState* exec = execCallee->callerFrame();
1487 VM& vm = exec->vm();
1488 auto throwScope = DECLARE_THROW_SCOPE(vm);
1489
1490 slowPathLogF("Performing call with recorded PC = %p\n", exec->currentVPC());
1491
1492 JSCell* calleeAsFunctionCell = getJSFunction(calleeAsValue);
1493 if (!calleeAsFunctionCell) {
1494 if (auto* internalFunction = jsDynamicCast<InternalFunction*>(vm, calleeAsValue)) {
1495 MacroAssemblerCodePtr<JSEntryPtrTag> codePtr = vm.getCTIInternalFunctionTrampolineFor(kind);
1496 ASSERT(!!codePtr);
1497
1498 if (!LLINT_ALWAYS_ACCESS_SLOW && callLinkInfo) {
1499 CodeBlock* callerCodeBlock = exec->codeBlock();
1500
1501 ConcurrentJSLocker locker(callerCodeBlock->m_lock);
1502
1503 if (callLinkInfo->isOnList())
1504 callLinkInfo->remove();
1505 callLinkInfo->callee.set(vm, callerCodeBlock, internalFunction);
1506 callLinkInfo->lastSeenCallee.set(vm, callerCodeBlock, internalFunction);
1507 callLinkInfo->machineCodeTarget = codePtr;
1508 }
1509
1510 assertIsTaggedWith(codePtr.executableAddress(), JSEntryPtrTag);
1511 LLINT_CALL_RETURN(exec, execCallee, codePtr.executableAddress(), JSEntryPtrTag);
1512 }
1513 RELEASE_AND_RETURN(throwScope, handleHostCall(execCallee, calleeAsValue, kind));
1514 }
1515 JSFunction* callee = jsCast<JSFunction*>(calleeAsFunctionCell);
1516 JSScope* scope = callee->scopeUnchecked();
1517 ExecutableBase* executable = callee->executable();
1518
1519 MacroAssemblerCodePtr<JSEntryPtrTag> codePtr;
1520 CodeBlock* codeBlock = 0;
1521 if (executable->isHostFunction())
1522 codePtr = executable->entrypointFor(kind, MustCheckArity);
1523 else {
1524 FunctionExecutable* functionExecutable = static_cast<FunctionExecutable*>(executable);
1525
1526 if (!isCall(kind) && functionExecutable->constructAbility() == ConstructAbility::CannotConstruct)
1527 LLINT_CALL_THROW(exec, createNotAConstructorError(exec, callee));
1528
1529 CodeBlock** codeBlockSlot = execCallee->addressOfCodeBlock();
1530 Exception* error = functionExecutable->prepareForExecution<FunctionExecutable>(vm, callee, scope, kind, *codeBlockSlot);
1531 EXCEPTION_ASSERT(throwScope.exception() == error);
1532 if (UNLIKELY(error))
1533 LLINT_CALL_THROW(exec, error);
1534 codeBlock = *codeBlockSlot;
1535 ASSERT(codeBlock);
1536 ArityCheckMode arity;
1537 if (execCallee->argumentCountIncludingThis() < static_cast<size_t>(codeBlock->numParameters()))
1538 arity = MustCheckArity;
1539 else
1540 arity = ArityCheckNotRequired;
1541 codePtr = functionExecutable->entrypointFor(kind, arity);
1542 }
1543
1544 ASSERT(!!codePtr);
1545
1546 if (!LLINT_ALWAYS_ACCESS_SLOW && callLinkInfo) {
1547 CodeBlock* callerCodeBlock = exec->codeBlock();
1548
1549 ConcurrentJSLocker locker(callerCodeBlock->m_lock);
1550
1551 if (callLinkInfo->isOnList())
1552 callLinkInfo->remove();
1553 callLinkInfo->callee.set(vm, callerCodeBlock, callee);
1554 callLinkInfo->lastSeenCallee.set(vm, callerCodeBlock, callee);
1555 callLinkInfo->machineCodeTarget = codePtr;
1556 if (codeBlock)
1557 codeBlock->linkIncomingCall(exec, callLinkInfo);
1558 }
1559
1560 assertIsTaggedWith(codePtr.executableAddress(), JSEntryPtrTag);
1561 LLINT_CALL_RETURN(exec, execCallee, codePtr.executableAddress(), JSEntryPtrTag);
1562}
1563
1564template<typename Op>
1565inline SlowPathReturnType genericCall(ExecState* exec, Op&& bytecode, CodeSpecializationKind kind)
1566{
1567 // This needs to:
1568 // - Set up a call frame.
1569 // - Figure out what to call and compile it if necessary.
1570 // - If possible, link the call's inline cache.
1571 // - Return a tuple of machine code address to call and the new call frame.
1572
1573 JSValue calleeAsValue = getOperand(exec, bytecode.m_callee);
1574
1575 ExecState* execCallee = exec - bytecode.m_argv;
1576
1577 execCallee->setArgumentCountIncludingThis(bytecode.m_argc);
1578 execCallee->uncheckedR(CallFrameSlot::callee) = calleeAsValue;
1579 execCallee->setCallerFrame(exec);
1580
1581 auto& metadata = bytecode.metadata(exec);
1582 return setUpCall(execCallee, kind, calleeAsValue, &metadata.m_callLinkInfo);
1583}
1584
1585LLINT_SLOW_PATH_DECL(slow_path_call)
1586{
1587 LLINT_BEGIN_NO_SET_PC();
1588 RELEASE_AND_RETURN(throwScope, genericCall(exec, pc->as<OpCall>(), CodeForCall));
1589}
1590
1591LLINT_SLOW_PATH_DECL(slow_path_tail_call)
1592{
1593 LLINT_BEGIN_NO_SET_PC();
1594 RELEASE_AND_RETURN(throwScope, genericCall(exec, pc->as<OpTailCall>(), CodeForCall));
1595}
1596
1597LLINT_SLOW_PATH_DECL(slow_path_construct)
1598{
1599 LLINT_BEGIN_NO_SET_PC();
1600 RELEASE_AND_RETURN(throwScope, genericCall(exec, pc->as<OpConstruct>(), CodeForConstruct));
1601}
1602
1603LLINT_SLOW_PATH_DECL(slow_path_size_frame_for_varargs)
1604{
1605 LLINT_BEGIN();
1606 // This needs to:
1607 // - Set up a call frame while respecting the variable arguments.
1608
1609 unsigned numUsedStackSlots;
1610 JSValue arguments;
1611 int firstVarArg;
1612 switch (pc->opcodeID()) {
1613 case op_call_varargs: {
1614 auto bytecode = pc->as<OpCallVarargs>();
1615 numUsedStackSlots = -bytecode.m_firstFree.offset();
1616 arguments = getOperand(exec, bytecode.m_arguments);
1617 firstVarArg = bytecode.m_firstVarArg;
1618 break;
1619 }
1620 case op_tail_call_varargs: {
1621 auto bytecode = pc->as<OpTailCallVarargs>();
1622 numUsedStackSlots = -bytecode.m_firstFree.offset();
1623 arguments = getOperand(exec, bytecode.m_arguments);
1624 firstVarArg = bytecode.m_firstVarArg;
1625 break;
1626 }
1627 case op_construct_varargs: {
1628 auto bytecode = pc->as<OpConstructVarargs>();
1629 numUsedStackSlots = -bytecode.m_firstFree.offset();
1630 arguments = getOperand(exec, bytecode.m_arguments);
1631 firstVarArg = bytecode.m_firstVarArg;
1632 break;
1633 }
1634 default:
1635 RELEASE_ASSERT_NOT_REACHED();
1636 }
1637 unsigned length = sizeFrameForVarargs(exec, vm, arguments, numUsedStackSlots, firstVarArg);
1638 LLINT_CALL_CHECK_EXCEPTION(exec, exec);
1639
1640 ExecState* execCallee = calleeFrameForVarargs(exec, numUsedStackSlots, length + 1);
1641 vm.varargsLength = length;
1642 vm.newCallFrameReturnValue = execCallee;
1643
1644 LLINT_RETURN_CALLEE_FRAME(execCallee);
1645}
1646
1647LLINT_SLOW_PATH_DECL(slow_path_size_frame_for_forward_arguments)
1648{
1649 LLINT_BEGIN();
1650 // This needs to:
1651 // - Set up a call frame with the same arguments as the current frame.
1652
1653 auto bytecode = pc->as<OpTailCallForwardArguments>();
1654 unsigned numUsedStackSlots = -bytecode.m_firstFree.offset();
1655
1656 unsigned arguments = sizeFrameForForwardArguments(exec, vm, numUsedStackSlots);
1657 LLINT_CALL_CHECK_EXCEPTION(exec, exec);
1658
1659 ExecState* execCallee = calleeFrameForVarargs(exec, numUsedStackSlots, arguments + 1);
1660
1661 vm.varargsLength = arguments;
1662 vm.newCallFrameReturnValue = execCallee;
1663
1664 LLINT_RETURN_CALLEE_FRAME(execCallee);
1665}
1666
1667enum class SetArgumentsWith {
1668 Object,
1669 CurrentArguments
1670};
1671
1672template<typename Op>
1673inline SlowPathReturnType varargsSetup(ExecState* exec, const Instruction* pc, CodeSpecializationKind kind, SetArgumentsWith set)
1674{
1675 LLINT_BEGIN_NO_SET_PC();
1676 // This needs to:
1677 // - Figure out what to call and compile it if necessary.
1678 // - Return a tuple of machine code address to call and the new call frame.
1679
1680 auto bytecode = pc->as<Op>();
1681 JSValue calleeAsValue = getOperand(exec, bytecode.m_callee);
1682
1683 ExecState* execCallee = vm.newCallFrameReturnValue;
1684
1685 if (set == SetArgumentsWith::Object) {
1686 setupVarargsFrameAndSetThis(exec, execCallee, getOperand(exec, bytecode.m_thisValue), getOperand(exec, bytecode.m_arguments), bytecode.m_firstVarArg, vm.varargsLength);
1687 LLINT_CALL_CHECK_EXCEPTION(exec, exec);
1688 } else
1689 setupForwardArgumentsFrameAndSetThis(exec, execCallee, getOperand(exec, bytecode.m_thisValue), vm.varargsLength);
1690
1691 execCallee->setCallerFrame(exec);
1692 execCallee->uncheckedR(CallFrameSlot::callee) = calleeAsValue;
1693 exec->setCurrentVPC(pc);
1694
1695 RELEASE_AND_RETURN(throwScope, setUpCall(execCallee, kind, calleeAsValue));
1696}
1697
1698LLINT_SLOW_PATH_DECL(slow_path_call_varargs)
1699{
1700 return varargsSetup<OpCallVarargs>(exec, pc, CodeForCall, SetArgumentsWith::Object);
1701}
1702
1703LLINT_SLOW_PATH_DECL(slow_path_tail_call_varargs)
1704{
1705 return varargsSetup<OpTailCallVarargs>(exec, pc, CodeForCall, SetArgumentsWith::Object);
1706}
1707
1708LLINT_SLOW_PATH_DECL(slow_path_tail_call_forward_arguments)
1709{
1710 return varargsSetup<OpTailCallForwardArguments>(exec, pc, CodeForCall, SetArgumentsWith::CurrentArguments);
1711}
1712
1713LLINT_SLOW_PATH_DECL(slow_path_construct_varargs)
1714{
1715 return varargsSetup<OpConstructVarargs>(exec, pc, CodeForConstruct, SetArgumentsWith::Object);
1716}
1717
1718inline SlowPathReturnType commonCallEval(ExecState* exec, const Instruction* pc, MacroAssemblerCodePtr<JSEntryPtrTag> returnPoint)
1719{
1720 LLINT_BEGIN_NO_SET_PC();
1721 auto bytecode = pc->as<OpCallEval>();
1722 JSValue calleeAsValue = getNonConstantOperand(exec, bytecode.m_callee);
1723
1724 ExecState* execCallee = exec - bytecode.m_argv;
1725
1726 execCallee->setArgumentCountIncludingThis(bytecode.m_argc);
1727 execCallee->setCallerFrame(exec);
1728 execCallee->uncheckedR(CallFrameSlot::callee) = calleeAsValue;
1729 execCallee->setReturnPC(returnPoint.executableAddress());
1730 execCallee->setCodeBlock(0);
1731 exec->setCurrentVPC(pc);
1732
1733 if (!isHostFunction(calleeAsValue, globalFuncEval))
1734 RELEASE_AND_RETURN(throwScope, setUpCall(execCallee, CodeForCall, calleeAsValue));
1735
1736 vm.hostCallReturnValue = eval(execCallee);
1737 LLINT_CALL_RETURN(exec, execCallee, LLInt::getCodePtr(getHostCallReturnValue), CFunctionPtrTag);
1738}
1739
1740LLINT_SLOW_PATH_DECL(slow_path_call_eval)
1741{
1742 return commonCallEval(exec, pc, LLInt::getCodePtr<JSEntryPtrTag>(llint_generic_return_point));
1743}
1744
1745LLINT_SLOW_PATH_DECL(slow_path_call_eval_wide)
1746{
1747 return commonCallEval(exec, pc, LLInt::getWideCodePtr<JSEntryPtrTag>(llint_generic_return_point));
1748}
1749
1750LLINT_SLOW_PATH_DECL(slow_path_strcat)
1751{
1752 LLINT_BEGIN();
1753 auto bytecode = pc->as<OpStrcat>();
1754 LLINT_RETURN(jsStringFromRegisterArray(exec, &exec->uncheckedR(bytecode.m_src), bytecode.m_count));
1755}
1756
1757LLINT_SLOW_PATH_DECL(slow_path_to_primitive)
1758{
1759 LLINT_BEGIN();
1760 auto bytecode = pc->as<OpToPrimitive>();
1761 LLINT_RETURN(getOperand(exec, bytecode.m_src).toPrimitive(exec));
1762}
1763
1764LLINT_SLOW_PATH_DECL(slow_path_throw)
1765{
1766 LLINT_BEGIN();
1767 auto bytecode = pc->as<OpThrow>();
1768 LLINT_THROW(getOperand(exec, bytecode.m_value));
1769}
1770
1771LLINT_SLOW_PATH_DECL(slow_path_handle_traps)
1772{
1773 LLINT_BEGIN_NO_SET_PC();
1774 ASSERT(vm.needTrapHandling());
1775 vm.handleTraps(exec);
1776 UNUSED_PARAM(pc);
1777 LLINT_RETURN_TWO(throwScope.exception(), exec);
1778}
1779
1780LLINT_SLOW_PATH_DECL(slow_path_debug)
1781{
1782 LLINT_BEGIN();
1783 auto bytecode = pc->as<OpDebug>();
1784 vm.interpreter->debug(exec, bytecode.m_debugHookType);
1785
1786 LLINT_END();
1787}
1788
1789LLINT_SLOW_PATH_DECL(slow_path_handle_exception)
1790{
1791 LLINT_BEGIN_NO_SET_PC();
1792 UNUSED_PARAM(throwScope);
1793 genericUnwind(&vm, exec);
1794 LLINT_END_IMPL();
1795}
1796
1797LLINT_SLOW_PATH_DECL(slow_path_get_from_scope)
1798{
1799 LLINT_BEGIN();
1800 auto bytecode = pc->as<OpGetFromScope>();
1801 auto& metadata = bytecode.metadata(exec);
1802 const Identifier& ident = exec->codeBlock()->identifier(bytecode.m_var);
1803 JSObject* scope = jsCast<JSObject*>(getNonConstantOperand(exec, bytecode.m_scope));
1804
1805 // ModuleVar is always converted to ClosureVar for get_from_scope.
1806 ASSERT(metadata.m_getPutInfo.resolveType() != ModuleVar);
1807
1808 LLINT_RETURN(scope->getPropertySlot(exec, ident, [&] (bool found, PropertySlot& slot) -> JSValue {
1809 if (!found) {
1810 if (metadata.m_getPutInfo.resolveMode() == ThrowIfNotFound)
1811 return throwException(exec, throwScope, createUndefinedVariableError(exec, ident));
1812 return jsUndefined();
1813 }
1814
1815 JSValue result = JSValue();
1816 if (scope->isGlobalLexicalEnvironment()) {
1817 // When we can't statically prove we need a TDZ check, we must perform the check on the slow path.
1818 result = slot.getValue(exec, ident);
1819 if (result == jsTDZValue())
1820 return throwException(exec, throwScope, createTDZError(exec));
1821 }
1822
1823 CommonSlowPaths::tryCacheGetFromScopeGlobal(exec, vm, bytecode, scope, slot, ident);
1824
1825 if (!result)
1826 return slot.getValue(exec, ident);
1827 return result;
1828 }));
1829}
1830
1831LLINT_SLOW_PATH_DECL(slow_path_put_to_scope)
1832{
1833 LLINT_BEGIN();
1834
1835 auto bytecode = pc->as<OpPutToScope>();
1836 auto& metadata = bytecode.metadata(exec);
1837 CodeBlock* codeBlock = exec->codeBlock();
1838 const Identifier& ident = codeBlock->identifier(bytecode.m_var);
1839 JSObject* scope = jsCast<JSObject*>(getNonConstantOperand(exec, bytecode.m_scope));
1840 JSValue value = getOperand(exec, bytecode.m_value);
1841 if (metadata.m_getPutInfo.resolveType() == LocalClosureVar) {
1842 JSLexicalEnvironment* environment = jsCast<JSLexicalEnvironment*>(scope);
1843 environment->variableAt(ScopeOffset(metadata.m_operand)).set(vm, environment, value);
1844
1845 // Have to do this *after* the write, because if this puts the set into IsWatched, then we need
1846 // to have already changed the value of the variable. Otherwise we might watch and constant-fold
1847 // to the Undefined value from before the assignment.
1848 if (metadata.m_watchpointSet)
1849 metadata.m_watchpointSet->touch(vm, "Executed op_put_scope<LocalClosureVar>");
1850 LLINT_END();
1851 }
1852
1853 bool hasProperty = scope->hasProperty(exec, ident);
1854 LLINT_CHECK_EXCEPTION();
1855 if (hasProperty
1856 && scope->isGlobalLexicalEnvironment()
1857 && !isInitialization(metadata.m_getPutInfo.initializationMode())) {
1858 // When we can't statically prove we need a TDZ check, we must perform the check on the slow path.
1859 PropertySlot slot(scope, PropertySlot::InternalMethodType::Get);
1860 JSGlobalLexicalEnvironment::getOwnPropertySlot(scope, exec, ident, slot);
1861 if (slot.getValue(exec, ident) == jsTDZValue())
1862 LLINT_THROW(createTDZError(exec));
1863 }
1864
1865 if (metadata.m_getPutInfo.resolveMode() == ThrowIfNotFound && !hasProperty)
1866 LLINT_THROW(createUndefinedVariableError(exec, ident));
1867
1868 PutPropertySlot slot(scope, codeBlock->isStrictMode(), PutPropertySlot::UnknownContext, isInitialization(metadata.m_getPutInfo.initializationMode()));
1869 scope->methodTable(vm)->put(scope, exec, ident, value, slot);
1870
1871 CommonSlowPaths::tryCachePutToScopeGlobal(exec, codeBlock, bytecode, scope, slot, ident);
1872
1873 LLINT_END();
1874}
1875
1876LLINT_SLOW_PATH_DECL(slow_path_check_if_exception_is_uncatchable_and_notify_profiler)
1877{
1878 LLINT_BEGIN();
1879 RELEASE_ASSERT(!!throwScope.exception());
1880
1881 if (isTerminatedExecutionException(vm, throwScope.exception()))
1882 LLINT_RETURN_TWO(pc, bitwise_cast<void*>(static_cast<uintptr_t>(1)));
1883 LLINT_RETURN_TWO(pc, 0);
1884}
1885
1886LLINT_SLOW_PATH_DECL(slow_path_log_shadow_chicken_prologue)
1887{
1888 LLINT_BEGIN();
1889
1890 auto bytecode = pc->as<OpLogShadowChickenPrologue>();
1891 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1892 ShadowChicken* shadowChicken = vm.shadowChicken();
1893 RELEASE_ASSERT(shadowChicken);
1894 shadowChicken->log(vm, exec, ShadowChicken::Packet::prologue(exec->jsCallee(), exec, exec->callerFrame(), scope));
1895
1896 LLINT_END();
1897}
1898
1899LLINT_SLOW_PATH_DECL(slow_path_log_shadow_chicken_tail)
1900{
1901 LLINT_BEGIN();
1902
1903 auto bytecode = pc->as<OpLogShadowChickenTail>();
1904 JSValue thisValue = getNonConstantOperand(exec, bytecode.m_thisValue);
1905 JSScope* scope = exec->uncheckedR(bytecode.m_scope).Register::scope();
1906
1907#if USE(JSVALUE64)
1908 CallSiteIndex callSiteIndex(exec->codeBlock()->bytecodeOffset(pc));
1909#else
1910 CallSiteIndex callSiteIndex(pc);
1911#endif
1912 ShadowChicken* shadowChicken = vm.shadowChicken();
1913 RELEASE_ASSERT(shadowChicken);
1914 shadowChicken->log(vm, exec, ShadowChicken::Packet::tail(exec, thisValue, scope, exec->codeBlock(), callSiteIndex));
1915
1916 LLINT_END();
1917}
1918
1919LLINT_SLOW_PATH_DECL(slow_path_profile_catch)
1920{
1921 LLINT_BEGIN();
1922
1923 exec->codeBlock()->ensureCatchLivenessIsComputedForBytecodeOffset(exec->bytecodeOffset());
1924
1925 auto bytecode = pc->as<OpCatch>();
1926 auto& metadata = bytecode.metadata(exec);
1927 metadata.m_buffer->forEach([&] (ValueProfileAndOperand& profile) {
1928 profile.m_profile.m_buckets[0] = JSValue::encode(exec->uncheckedR(profile.m_operand).jsValue());
1929 });
1930
1931 LLINT_END();
1932}
1933
1934LLINT_SLOW_PATH_DECL(slow_path_super_sampler_begin)
1935{
1936 // FIXME: It seems like we should be able to do this in asm but llint doesn't seem to like global variables.
1937 // See: https://bugs.webkit.org/show_bug.cgi?id=179438
1938 UNUSED_PARAM(exec);
1939 g_superSamplerCount++;
1940 LLINT_END_IMPL();
1941}
1942
1943LLINT_SLOW_PATH_DECL(slow_path_super_sampler_end)
1944{
1945 // FIXME: It seems like we should be able to do this in asm but llint doesn't seem to like global variables.
1946 // See: https://bugs.webkit.org/show_bug.cgi?id=179438
1947 UNUSED_PARAM(exec);
1948 g_superSamplerCount--;
1949 LLINT_END_IMPL();
1950}
1951
1952LLINT_SLOW_PATH_DECL(slow_path_out_of_line_jump_target)
1953{
1954 CodeBlock* codeBlock = exec->codeBlock();
1955 pc = codeBlock->outOfLineJumpTarget(pc);
1956 LLINT_END_IMPL();
1957}
1958
1959extern "C" SlowPathReturnType llint_throw_stack_overflow_error(VM* vm, ProtoCallFrame* protoFrame)
1960{
1961 ExecState* exec = vm->topCallFrame;
1962 auto scope = DECLARE_THROW_SCOPE(*vm);
1963
1964 if (!exec)
1965 exec = protoFrame->callee()->globalObject(*vm)->globalExec();
1966 throwStackOverflowError(exec, scope);
1967 return encodeResult(0, 0);
1968}
1969
1970#if ENABLE(C_LOOP)
1971extern "C" SlowPathReturnType llint_stack_check_at_vm_entry(VM* vm, Register* newTopOfStack)
1972{
1973 bool success = vm->ensureStackCapacityFor(newTopOfStack);
1974 return encodeResult(reinterpret_cast<void*>(success), 0);
1975}
1976#endif
1977
1978extern "C" void llint_write_barrier_slow(ExecState* exec, JSCell* cell)
1979{
1980 VM& vm = exec->vm();
1981 vm.heap.writeBarrier(cell);
1982}
1983
1984extern "C" NO_RETURN_DUE_TO_CRASH void llint_crash()
1985{
1986 CRASH();
1987}
1988
1989} } // namespace JSC::LLInt
1990