WebKit/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp at main · WebKit/WebKit · GitHub

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* Redistribution and use in source and binary forms, with or without

* modification, are permitted provided that the following conditions

* are met:

* 1. Redistributions of source code must retain the above copyright

* notice, this list of conditions and the following disclaimer.

* 2. Redistributions in binary form must reproduce the above copyright

* notice, this list of conditions and the following disclaimer in the

* documentation and/or other materials provided with the distribution.

* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY

* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE

* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR

* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR

* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,

* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,

* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR

* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY

* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE

* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

#include "config.h"

#include "LLIntSlowPaths.h"

#include "AbortReason.h"

#include "ArrayConstructor.h"

#include "BaselineJITPlan.h"

#include "BytecodeGenerator.h"

#include "BytecodeOperandsForCheckpoint.h"

#include "CallFrame.h"

#include "CheckpointOSRExitSideState.h"

#include "CodeBlockInlines.h"

#include "CommonSlowPathsInlines.h"

#include "Error.h"

#include "ErrorHandlingScope.h"

#include "Exception.h"

#include "ExceptionFuzz.h"

#include "FrameTracers.h"

#include "FunctionAllowlist.h"

#include "FunctionCodeBlock.h"

#include "GetterSetter.h"

#include "InterpreterInlines.h"

#include "JITExceptions.h"

#include "JITWorklist.h"

#include "JSAsyncFromSyncIterator.h"

#include "JSAsyncFunction.h"

#include "JSAsyncGenerator.h"

#include "JSAsyncGeneratorFunction.h"

#include "JSCInlines.h"

#include "JSCJSValue.h"

#include "JSGeneratorFunction.h"

#include "JSGlobalObjectFunctions.h"

#include "JSLexicalEnvironmentInlines.h"

#include "JSMicrotask.h"

#include "JSSentinel.h"

#include "JSString.h"

#include "LLIntCommon.h"

#include "LLIntData.h"

#include "LLIntEntrypoint.h"

#include "LLIntExceptions.h"

#include "LLIntPrototypeLoadAdaptiveStructureWatchpoint.h"

#include "LLIntThunks.h"

#include "MaxFrameExtentForSlowPathCall.h"

#include "ObjectConstructor.h"

#include "ObjectPropertyConditionSet.h"

#include "ProtoCallFrameInlines.h"

#include "RegExpObject.h"

#include "RepatchInlines.h"

#include "ShadowChicken.h"

#include "SuperSampler.h"

#include "SymbolTableInlines.h"

#include "VMInlines.h"

#include "VMTrapsInlines.h"

#include <wtf/NeverDestroyed.h>

#include <wtf/StringPrintStream.h>

WTF_ALLOW_UNSAFE_BUFFER_USAGE_BEGIN

namespace JSC { namespace LLInt {

#define LLINT_BEGIN_NO_SET_PC() \

CodeBlock* codeBlock = callFrame->codeBlock(); \

JSGlobalObject* globalObject = codeBlock->globalObject(); \

VM& vm = codeBlock->vm(); \

SlowPathFrameTracer tracer(vm, callFrame); \

dataLogLnIf(LLINT_TRACING && Options::traceLLIntSlowPath(), "Calling slow path ", WTF_PRETTY_FUNCTION); \

auto throwScope = DECLARE_THROW_SCOPE(vm)

#ifndef NDEBUG

#define LLINT_SET_PC_FOR_STUBS() do { \

codeBlock->bytecodeOffset(pc); \

callFrame->setCurrentVPC(pc); \

} while (false)

#else

#define LLINT_SET_PC_FOR_STUBS() do { \

callFrame->setCurrentVPC(pc); \

} while (false)

#endif

#define LLINT_BEGIN() \

LLINT_BEGIN_NO_SET_PC(); \

LLINT_SET_PC_FOR_STUBS()

static inline JSValue NODELETE getNonConstantOperand(CallFrame* callFrame, VirtualRegister operand) { return callFrame->uncheckedR(operand).jsValue(); }

static inline JSValue NODELETE getOperand(CallFrame* callFrame, VirtualRegister operand) { return callFrame->r(operand).jsValue(); }

#define LLINT_RETURN_TWO(first, second) do { \

return encodeResult(first, second); \

} while (false)

#define LLINT_END_IMPL() LLINT_RETURN_TWO(pc, nullptr)

#define LLINT_THROW(exceptionToThrow) do { \

throwException(globalObject, throwScope, exceptionToThrow); \

pc = returnToThrow(vm); \

LLINT_END_IMPL(); \

} while (false)

#define LLINT_CHECK_EXCEPTION() do { \

doExceptionFuzzingIfEnabled(globalObject, throwScope, "LLIntSlowPaths", pc); \

if (throwScope.exception()) [[unlikely]] { \

pc = returnToThrow(vm); \

LLINT_END_IMPL(); \

} \

} while (false)

#define LLINT_END() do { \

LLINT_CHECK_EXCEPTION(); \

LLINT_END_IMPL(); \

} while (false)

#define JUMP_OFFSET(targetOffset) \

((targetOffset) ? (targetOffset) : codeBlock->outOfLineJumpOffset(pc))

#define JUMP_TO(target) do { \

pc = reinterpret_cast<const JSInstruction*>(reinterpret_cast<const uint8_t*>(pc) + (target)); \

} while (false)

#define LLINT_BRANCH(condition) do { \

bool __b_condition = (condition); \

LLINT_CHECK_EXCEPTION(); \

if (__b_condition) \

JUMP_TO(JUMP_OFFSET(bytecode.m_targetLabel)); \

else \

JUMP_TO(pc->size()); \

LLINT_END_IMPL(); \

} while (false)

#define LLINT_RETURN(value) do { \

JSValue __r_returnValue = (value); \

LLINT_CHECK_EXCEPTION(); \

callFrame->uncheckedR(bytecode.m_dst) = __r_returnValue; \

LLINT_END_IMPL(); \

} while (false)

#define LLINT_RETURN_PROFILED(value) do { \

JSValue __rp_returnValue = (value); \

LLINT_CHECK_EXCEPTION(); \

callFrame->uncheckedR(bytecode.m_dst) = __rp_returnValue; \

LLINT_PROFILE_VALUE(__rp_returnValue); \

LLINT_END_IMPL(); \

} while (false)

#define LLINT_PROFILE_VALUE(value) do { \

codeBlock->valueProfileForOffset(bytecode.m_valueProfile).m_buckets[0] = JSValue::encode(value); \

} while (false)

#define LLINT_CALL_END_IMPL(callFrame, callTarget, callTargetTag) \

LLINT_RETURN_TWO((retagCodePtr<callTargetTag, JSEntrySlowPathPtrTag>(callTarget)), (callFrame))

#define LLINT_CALL_THROW(globalObject, exceptionToThrow) do { \

JSGlobalObject* __ct_globalObject = (globalObject); \

throwException(__ct_globalObject, throwScope, exceptionToThrow); \

LLINT_CALL_END_IMPL(nullptr, callToThrow(vm).code().taggedPtr(), ExceptionHandlerPtrTag); \

} while (false)

#define LLINT_CALL_CHECK_EXCEPTION(globalObject) do { \

JSGlobalObject* __cce_globalObject = (globalObject); \

doExceptionFuzzingIfEnabled(__cce_globalObject, throwScope, "LLIntSlowPaths/call", nullptr); \

if (throwScope.exception()) [[unlikely]] \

LLINT_CALL_END_IMPL(nullptr, callToThrow(vm).code().taggedPtr(), ExceptionHandlerPtrTag); \

} while (false)

#define LLINT_CALL_RETURN(globalObject, calleeFrame, callTarget, callTargetTag) do { \

JSGlobalObject* __cr_globalObject = (globalObject); \

CallFrame* __cr_calleeFrame = (calleeFrame); \

void* __cr_callTarget = (callTarget); \

LLINT_CALL_CHECK_EXCEPTION(__cr_globalObject); \

LLINT_CALL_END_IMPL(__cr_calleeFrame, __cr_callTarget, callTargetTag); \

} while (false)

#define LLINT_RETURN_CALLEE_FRAME(calleeFrame) do { \

CallFrame* __rcf_calleeFrame = (calleeFrame); \

LLINT_RETURN_TWO(pc, __rcf_calleeFrame); \

} while (false)

#if LLINT_TRACING

template<typename... Types>

void slowPathLog(const Types&... values)

{

dataLogIf(Options::traceLLIntSlowPath(), values...);

}

template<typename... Types>

void slowPathLn(const Types&... values)

{

dataLogLnIf(Options::traceLLIntSlowPath(), values...);

}

template<typename... Types>

void slowPathLogF(const char* format, const Types&... values)

{

ALLOW_NONLITERAL_FORMAT_BEGIN

IGNORE_WARNINGS_BEGIN("format-security")

if (Options::traceLLIntSlowPath())

dataLogF(format, values...);

IGNORE_WARNINGS_END

ALLOW_NONLITERAL_FORMAT_END

}

#else // not LLINT_TRACING

template<typename... Types> void NODELETE slowPathLog(const Types&...) { }

template<typename... Types> void slowPathLogLn(const Types&...) { }

template<typename... Types> void NODELETE slowPathLogF(const char*, const Types&...) { }

#endif // LLINT_TRACING

extern "C" UGPRPair SYSV_ABI llint_trace_operand(CallFrame* callFrame, const JSInstruction* pc, int fromWhere, int operand)

{

if (!Options::traceLLIntExecution())

LLINT_END_IMPL();

LLINT_BEGIN();

dataLogF(

"<%p> %p / %p: executing bc#%zu, op#%u: Trace(%d): %d\n",

&Thread::currentSingleton(),

callFrame->codeBlock(),

globalObject,

static_cast<intptr_t>(callFrame->codeBlock()->bytecodeOffset(pc)),

pc->opcodeID(),

fromWhere,

operand);

LLINT_END();

}

extern "C" UGPRPair SYSV_ABI llint_trace_value(CallFrame* callFrame, const JSInstruction* pc, int fromWhere, VirtualRegister operand)

{

if (!Options::traceLLIntExecution())

LLINT_END_IMPL();

JSValue value = getOperand(callFrame, operand);

union {

struct {

uint32_t tag;

uint32_t payload;

} bits;

EncodedJSValue asValue;

} u;

u.asValue = JSValue::encode(value);

dataLogF(

"<%p> %p / %p: executing bc#%zu, op#%u: Trace(%d): %d: %08x:%08x: %s\n",

&Thread::currentSingleton(),

callFrame->codeBlock(),

callFrame,

static_cast<intptr_t>(callFrame->codeBlock()->bytecodeOffset(pc)),

pc->opcodeID(),

fromWhere,

operand.offset(),

u.bits.tag,

u.bits.payload,

toCString(value).data());

LLINT_END_IMPL();

}

LLINT_SLOW_PATH_DECL(trace_prologue)

{

if (!Options::traceLLIntExecution())

LLINT_END_IMPL();

CodeBlock* codeBlock = callFrame->codeBlock();

dataLogF("<%p> %p / %p: in prologue of ", &Thread::currentSingleton(), codeBlock, callFrame);

dataLog(codeBlock, "\n");

LLINT_END_IMPL();

}

static void traceFunctionPrologue(CallFrame* callFrame, const char* comment, CodeSpecializationKind kind)

{

if (!Options::traceLLIntExecution())

return;

JSFunction* callee = uncheckedDowncast<JSFunction>(callFrame->jsCallee());

FunctionExecutable* executable = callee->jsExecutable();

CodeBlock* codeBlock = executable->codeBlockFor(kind);

dataLogF("<%p> %p / %p: in %s of ", &Thread::currentSingleton(), codeBlock, callFrame, comment);

dataLog(codeBlock);

dataLogF(" function %p, executable %p; numVars = %u, numParameters = %u, numCalleeLocals = %u, caller = %p.\n",

callee, executable, codeBlock->numVars(), codeBlock->numParameters(), codeBlock->numCalleeLocals(), callFrame->callerFrame());

}

LLINT_SLOW_PATH_DECL(trace_prologue_function_for_call)

{

traceFunctionPrologue(callFrame, "call prologue", CodeSpecializationKind::CodeForCall);

LLINT_END_IMPL();

}

LLINT_SLOW_PATH_DECL(trace_prologue_function_for_construct)

{

traceFunctionPrologue(callFrame, "construct prologue", CodeSpecializationKind::CodeForConstruct);

LLINT_END_IMPL();

}

LLINT_SLOW_PATH_DECL(trace_arityCheck_for_call)

{

traceFunctionPrologue(callFrame, "call arity check", CodeSpecializationKind::CodeForCall);

LLINT_END_IMPL();

}

LLINT_SLOW_PATH_DECL(trace_arityCheck_for_construct)

{

traceFunctionPrologue(callFrame, "construct arity check", CodeSpecializationKind::CodeForConstruct);

LLINT_END_IMPL();

}

LLINT_SLOW_PATH_DECL(trace)

{

if (!Options::traceLLIntExecution())

LLINT_END_IMPL();

CodeBlock* codeBlock = callFrame->codeBlock();

OpcodeID opcodeID = pc->opcodeID();

SAFE_DATALOGF("<%p> %p / %p: executing bc#%zu, %s, pc = %p\n",

&Thread::currentSingleton(),

codeBlock,

callFrame,

static_cast<intptr_t>(codeBlock->bytecodeOffset(pc)),

pc->name(),

pc);

if (opcodeID == op_enter) {

dataLogF("Frame will eventually return to %p\n", callFrame->returnPCForInspection());

*std::bit_cast<volatile char*>(callFrame->returnPCForInspection());

}

if (opcodeID == op_ret) {

dataLogF("Will be returning to %p\n", callFrame->returnPCForInspection());

dataLogF("The new cfr will be %p\n", callFrame->callerFrame());

}

LLINT_END_IMPL();

}

enum EntryKind { Prologue, ArityCheck };

#if ENABLE(JIT)

static FunctionAllowlist& ensureGlobalJITAllowlist()

{

static LazyNeverDestroyed<FunctionAllowlist> baselineAllowlist;

static std::once_flag initializeAllowlistFlag;

std::call_once(initializeAllowlistFlag, [] {

const char* functionAllowlistFile = Options::jitAllowlist();

baselineAllowlist.construct(functionAllowlistFile);

});

return baselineAllowlist;

}

static inline bool shouldJIT(CodeBlock* codeBlock)

{

if (!Options::bytecodeRangeToJITCompile().isInRange(codeBlock->instructionsSize())

|| !ensureGlobalJITAllowlist().contains(codeBlock))

return false;

return Options::useBaselineJIT();

}

// Returns true if we should try to OSR.

static inline bool jitCompileAndSetHeuristics(VM& vm, CodeBlock* codeBlock)

{

DeferGCForAWhile deferGC(vm); // My callers don't set top callframe, so we don't want to GC here at all.

ASSERT(Options::useJIT());

if (codeBlock->jitType() != JITType::BaselineJIT) {

if (RefPtr<BaselineJITCode> baselineRef = codeBlock->unlinkedCodeBlock()->m_unlinkedBaselineCode) {

codeBlock->setupWithUnlinkedBaselineCode(baselineRef.releaseNonNull());

codeBlock->ownerExecutable()->installCode(codeBlock);

codeBlock->jitNextInvocation();

return true;

}

if (!codeBlock->checkIfJITThresholdReached()) {

CODEBLOCK_LOG_EVENT(codeBlock, "delayJITCompile", ("threshold not reached, counter = ", codeBlock->llintExecuteCounter()));

dataLogLnIf(Options::verboseOSR(), " JIT threshold should be lifted.");

return false;

}

JITWorklist::State worklistState = JITWorklist::ensureGlobalWorklist().completeAllReadyPlansForVM(vm, JITCompilationKey(codeBlock->unlinkedCodeBlock(), JITCompilationMode::Baseline));

if (codeBlock->jitType() == JITType::BaselineJIT) {

dataLogLnIf(Options::verboseOSR(), " Code was already compiled.");

codeBlock->jitSoon();

return true;

}

if (worklistState == JITWorklist::NotKnown) {

Ref<BaselineJITPlan> plan = adoptRef(*new BaselineJITPlan(codeBlock));

JITWorklist::ensureGlobalWorklist().enqueue(WTF::move(plan));

return codeBlock->jitType() == JITType::BaselineJIT;

}

return false;

}

static UGPRPair entryOSR(CodeBlock* codeBlock, const char *name, EntryKind kind)

{

dataLogLnIf(Options::verboseOSR(),

*codeBlock, ": Entered ", name, " with executeCounter = ",

codeBlock->llintExecuteCounter());

if (!shouldJIT(codeBlock)) {

codeBlock->dontJITAnytimeSoon();

LLINT_RETURN_TWO(nullptr, nullptr);

}

VM& vm = codeBlock->vm();

if (!jitCompileAndSetHeuristics(vm, codeBlock))

LLINT_RETURN_TWO(nullptr, nullptr);

CODEBLOCK_LOG_EVENT(codeBlock, "OSR entry", ("in prologue"));

if (kind == Prologue)

LLINT_RETURN_TWO(codeBlock->jitCode()->executableAddress(), nullptr);

ASSERT(kind == ArityCheck);

LLINT_RETURN_TWO(codeBlock->jitCode()->addressForCall(ArityCheckMode::MustCheckArity).taggedPtr(), nullptr);

}

#else // ENABLE(JIT)

static UGPRPair entryOSR(CodeBlock* codeBlock, const char*, EntryKind)

{

codeBlock->dontJITAnytimeSoon();

LLINT_RETURN_TWO(nullptr, nullptr);

}

#endif // ENABLE(JIT)

LLINT_SLOW_PATH_DECL(entry_osr)

{

UNUSED_PARAM(pc);

return entryOSR(callFrame->codeBlock(), "entry_osr", Prologue);

}

LLINT_SLOW_PATH_DECL(entry_osr_function_for_call)

{

UNUSED_PARAM(pc);

return entryOSR(uncheckedDowncast<JSFunction>(callFrame->jsCallee())->jsExecutable()->codeBlockForCall(), "entry_osr_function_for_call", Prologue);

}

LLINT_SLOW_PATH_DECL(entry_osr_function_for_construct)

{

UNUSED_PARAM(pc);

return entryOSR(uncheckedDowncast<JSFunction>(callFrame->jsCallee())->jsExecutable()->codeBlockForConstruct(), "entry_osr_function_for_construct", Prologue);

}

LLINT_SLOW_PATH_DECL(entry_osr_function_for_call_arityCheck)

{

UNUSED_PARAM(pc);

return entryOSR(uncheckedDowncast<JSFunction>(callFrame->jsCallee())->jsExecutable()->codeBlockForCall(), "entry_osr_function_for_call_arityCheck", ArityCheck);

}

LLINT_SLOW_PATH_DECL(entry_osr_function_for_construct_arityCheck)

{

UNUSED_PARAM(pc);

return entryOSR(uncheckedDowncast<JSFunction>(callFrame->jsCallee())->jsExecutable()->codeBlockForConstruct(), "entry_osr_function_for_construct_arityCheck", ArityCheck);

}

LLINT_SLOW_PATH_DECL(loop_osr)

{

LLINT_BEGIN_NO_SET_PC();

UNUSED_PARAM(throwScope);

UNUSED_PARAM(globalObject);

#if ENABLE(JIT)

dataLogLnIf(Options::verboseOSR(),

*codeBlock, ": Entered loop_osr with executeCounter = ",

codeBlock->llintExecuteCounter());

if (Options::returnEarlyFromInfiniteLoopsForFuzzing() && codeBlock->loopHintsAreEligibleForFuzzingEarlyReturn()) [[unlikely]] {

uintptr_t* ptr = vm.getLoopHintExecutionCounter(pc);

*ptr += codeBlock->llintExecuteCounter().m_activeThreshold;

if (*ptr >= Options::earlyReturnFromInfiniteLoopsLimit())

LLINT_RETURN_TWO(LLInt::fuzzerReturnEarlyFromLoopHintEntrypoint().code().taggedPtr(), callFrame->topOfFrame());

}

if (!shouldJIT(codeBlock)) {

codeBlock->dontJITAnytimeSoon();

LLINT_RETURN_TWO(nullptr, nullptr);

}

if (!jitCompileAndSetHeuristics(vm, codeBlock))

LLINT_RETURN_TWO(nullptr, nullptr);

auto loopOSREntryBytecodeIndex = BytecodeIndex(codeBlock->bytecodeOffset(pc));

CODEBLOCK_LOG_EVENT(codeBlock, "osrEntry", ("at ", loopOSREntryBytecodeIndex));

RELEASE_ASSERT(codeBlock->jitType() == JITType::BaselineJIT);

const JITCodeMap& codeMap = codeBlock->jitCodeMap();

CodeLocationLabel<JSEntryPtrTag> codeLocation = codeMap.find(loopOSREntryBytecodeIndex);

ASSERT(codeLocation);

void* jumpTarget = codeLocation.taggedPtr();

ASSERT(jumpTarget);

LLINT_RETURN_TWO(jumpTarget, callFrame->topOfFrame());

#else // ENABLE(JIT)

UNUSED_PARAM(pc);

codeBlock->dontJITAnytimeSoon();

LLINT_RETURN_TWO(0, 0);

#endif // ENABLE(JIT)

}

LLINT_SLOW_PATH_DECL(replace)

{

LLINT_BEGIN_NO_SET_PC();

UNUSED_PARAM(throwScope);

UNUSED_PARAM(globalObject);

#if ENABLE(JIT)

dataLogLnIf(Options::verboseOSR(),

*codeBlock, ": Entered replace with executeCounter = ",

codeBlock->llintExecuteCounter());

if (shouldJIT(codeBlock))

jitCompileAndSetHeuristics(vm, codeBlock);

else

codeBlock->dontJITAnytimeSoon();

LLINT_END_IMPL();

#else // ENABLE(JIT)

codeBlock->dontJITAnytimeSoon();

LLINT_END_IMPL();

#endif // ENABLE(JIT)

}

UGPRPair SYSV_ABI llint_check_stack_and_vm_traps(CallFrame* callFrame, const JSInstruction* pc, void* newTopOfStack)

{

// It's ok to create the SlowPathFrameTracer here before we

// convertToZombieFrame() because this function is always called

// after the frame has been propulated with a proper CodeBlock and callee.

LLINT_BEGIN();

if (Options::traceLLIntSlowPath()) [[unlikely]] {

slowPathLogF("Checking VMTraps and stack height with callFrame = %p.\n", callFrame);

slowPathLog("CodeBlock = ", codeBlock, "\n");

if (codeBlock) {

slowPathLogF("Num callee registers = %u.\n", codeBlock->numCalleeLocals());

slowPathLogF("Num vars = %u.\n", codeBlock->numVars());

}

slowPathLogF("Current OS stack end is at %p.\n", vm.softStackLimit());

#if ENABLE(C_LOOP)

slowPathLogF("Current C Loop stack end is at %p.\n", vm.cloopStackLimit());

#endif

}

if (vm.traps().handleTrapsIfNeeded()) {

if (vm.hasPendingTerminationException()) {

throwScope.release();

callFrame->convertToZombieFrame(vm, codeBlock);

pc = returnToThrow(vm);

LLINT_RETURN_TWO(pc, callFrame);

}

throwScope.assertNoException();

// Redo stack check because we may really have gotten here due to an imminent StackOverflow.

bool imminentOverflowDetected = false;

#if ENABLE(C_LOOP)

if (newTopOfStackRegister < reinterpret_cast<Register*>(callFrame)) {

if (!vm.ensureJSStackCapacityFor(newTopOfStackRegister))

imminentOverflowDetected = true;

} else

imminentOverflowDetected = true; // Stack underflow == overflow.

#else // not C_LOOP case

void* softStackLimit = vm.softStackLimit();

#if CPU(ADDRESS32)

// With 32-bit addresses, there's a chance that we can underflow, and need this check.

// The new stack pointer should only grow smaller. The only way it can be larger than

// the callFrame is if subtracting the stack frame size resulted in an underflow.

if (std::bit_cast<uintptr_t>(newTopOfStack) > std::bit_cast<uintptr_t>(callFrame))

imminentOverflowDetected = true;

#endif

if (newTopOfStack < softStackLimit)

imminentOverflowDetected = true;

#endif // end of not C_LOOP case

// If the stack check succeeds and we don't need to throw any errors, then

// we'll return 0 instead. The prologue will check for a non-zero value

// when determining whether to set the callFrame or not.

if (!imminentOverflowDetected)

LLINT_RETURN_TWO(pc, 0);

// Hence, if we get here, then we know a stack overflow is imminent. So, just

// throw the StackOverflowError unconditionally.

callFrame->convertToZombieFrame(vm, codeBlock);

ErrorHandlingScope errorScope(vm);

throwStackOverflowError(globalObject, throwScope);

pc = returnToThrow(vm);

LLINT_RETURN_TWO(pc, callFrame);

}

extern "C" UGPRPair SYSV_ABI llint_default_call(CallFrame* calleeFrame, CallLinkInfo* callLinkInfo)

{

JSCell* owner = callLinkInfo->ownerForSlowPath(calleeFrame);

VM& vm = owner->vm();

NativeCallFrameTracer tracer(vm, calleeFrame);

sanitizeStackForVM(vm);

auto scope = DECLARE_THROW_SCOPE(vm);

calleeFrame->setCodeBlock(nullptr);

void* callTarget = linkFor(vm, owner, calleeFrame, callLinkInfo);

ensureStillAliveHere(owner);

if (scope.exception()) [[unlikely]]

return encodeResult(callTarget, std::bit_cast<void*>(&vm));

return encodeResult(callTarget, nullptr);

}

extern "C" UGPRPair SYSV_ABI llint_virtual_call(CallFrame* calleeFrame, CallLinkInfo* callLinkInfo)

{

JSCell* owner = callLinkInfo->ownerForSlowPath(calleeFrame);

VM& vm = owner->vm();

NativeCallFrameTracer tracer(vm, calleeFrame);

sanitizeStackForVM(vm);

auto scope = DECLARE_THROW_SCOPE(vm);

JSCell* calleeAsFunctionCellIgnored;

calleeFrame->setCodeBlock(nullptr);

void* callTarget = virtualForWithFunction(vm, owner, calleeFrame, callLinkInfo, calleeAsFunctionCellIgnored);

ensureStillAliveHere(owner);

if (scope.exception()) [[unlikely]]

return encodeResult(callTarget, std::bit_cast<void*>(&vm));

return encodeResult(callTarget, nullptr);

}

extern "C" UGPRPair SYSV_ABI llint_polymorphic_call(CallFrame* calleeFrame, CallLinkInfo* callLinkInfo)

{

JSCell* owner = callLinkInfo->ownerForSlowPath(calleeFrame);

VM& vm = owner->vm();

NativeCallFrameTracer tracer(vm, calleeFrame);

sanitizeStackForVM(vm);

auto scope = DECLARE_THROW_SCOPE(vm);

JSCell* calleeAsFunctionCell;

calleeFrame->setCodeBlock(nullptr);

void* callTarget = virtualForWithFunction(vm, owner, calleeFrame, callLinkInfo, calleeAsFunctionCell);

if (scope.exception()) [[unlikely]]

return encodeResult(callTarget, std::bit_cast<void*>(&vm));

// A null cell means virtualForWithFunction did a host call that ran JS and may have freed *callLinkInfo; don't link.

if (calleeAsFunctionCell) [[likely]]

linkPolymorphicCall(vm, owner, calleeFrame, *callLinkInfo, CallVariant(calleeAsFunctionCell));

ensureStillAliveHere(owner);

if (scope.exception()) [[unlikely]]

return encodeResult(callTarget, std::bit_cast<void*>(&vm));

return encodeResult(callTarget, nullptr);

}

LLINT_SLOW_PATH_DECL(slow_path_new_object)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpNewObject>();

auto& metadata = bytecode.metadata(codeBlock);

LLINT_RETURN(constructEmptyObject(vm, metadata.m_objectAllocationProfile.structure()));

}

LLINT_SLOW_PATH_DECL(slow_path_new_array)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpNewArray>();

auto& metadata = bytecode.metadata(codeBlock);

LLINT_RETURN(constructArrayNegativeIndexed(globalObject, &metadata.m_arrayAllocationProfile, std::bit_cast<JSValue*>(&callFrame->uncheckedR(bytecode.m_argv)), bytecode.m_argc));

}

LLINT_SLOW_PATH_DECL(slow_path_new_array_with_size)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpNewArrayWithSize>();

auto& metadata = bytecode.metadata(codeBlock);

LLINT_RETURN(constructArrayWithSizeQuirk(globalObject, &metadata.m_arrayAllocationProfile, getOperand(callFrame, bytecode.m_length)));

}

LLINT_SLOW_PATH_DECL(slow_path_new_reg_exp)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpNewRegExp>();

RegExp* regExp = uncheckedDowncast<RegExp>(getOperand(callFrame, bytecode.m_regexp));

static constexpr bool areLegacyFeaturesEnabled = true;

LLINT_RETURN(RegExpObject::create(vm, globalObject->regExpStructure(), regExp, areLegacyFeaturesEnabled));

}

LLINT_SLOW_PATH_DECL(slow_path_create_lexical_environment)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpCreateLexicalEnvironment>();

JSScope* currentScope = callFrame->uncheckedR(bytecode.m_scope).Register::scope();

SymbolTable* symbolTable = uncheckedDowncast<SymbolTable>(getOperand(callFrame, bytecode.m_symbolTable));

JSValue initialValue = getOperand(callFrame, bytecode.m_initialValue);

ASSERT(initialValue == jsUndefined() || initialValue == jsTDZValue());

JSScope* newScope = JSLexicalEnvironment::create(vm, globalObject, currentScope, symbolTable, initialValue);

LLINT_RETURN(newScope);

}

LLINT_SLOW_PATH_DECL(slow_path_create_direct_arguments)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpCreateDirectArguments>();

LLINT_RETURN(DirectArguments::createByCopying(globalObject, callFrame));

}

LLINT_SLOW_PATH_DECL(slow_path_create_scoped_arguments)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpCreateScopedArguments>();

JSLexicalEnvironment* scope = uncheckedDowncast<JSLexicalEnvironment>(getOperand(callFrame, bytecode.m_scope));

ScopedArgumentsTable* table = scope->symbolTable()->arguments();

LLINT_RETURN(ScopedArguments::createByCopying(globalObject, callFrame, table, scope));

}

LLINT_SLOW_PATH_DECL(slow_path_create_cloned_arguments)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpCreateClonedArguments>();

auto result = ClonedArguments::createWithMachineFrame(globalObject, callFrame, ArgumentsMode::Cloned);

EXCEPTION_ASSERT(throwScope.exception() || result);

LLINT_RETURN(result);

}

LLINT_SLOW_PATH_DECL(slow_path_get_by_id_direct)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpGetByIdDirect>();

const Identifier& ident = codeBlock->identifier(bytecode.m_property);

JSValue baseValue = getOperand(callFrame, bytecode.m_base);

PropertySlot slot(baseValue, PropertySlot::PropertySlot::InternalMethodType::GetOwnProperty);

bool found = baseValue.getOwnPropertySlot(globalObject, ident, slot);

LLINT_CHECK_EXCEPTION();

JSValue result = found ? slot.getValue(globalObject, ident) : jsUndefined();

LLINT_CHECK_EXCEPTION();

if (Options::useLLIntICs() && slot.isCacheable() && !slot.isUnset()) {

auto& metadata = bytecode.metadata(codeBlock);

{

StructureID oldStructureID = metadata.m_structureID;

if (oldStructureID) {

Structure* a = oldStructureID.decode();

Structure* b = baseValue.asCell()->structure();

if (Structure::shouldConvertToPolyProto(a, b)) {

ASSERT(a->rareData()->sharedPolyProtoWatchpoint().get() == b->rareData()->sharedPolyProtoWatchpoint().get());

a->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));

}

JSCell* baseCell = baseValue.asCell();

Structure* structure = baseCell->structure();

if (slot.isValue()) {

// Start out by clearing out the old cache.

metadata.m_structureID = StructureID();

metadata.m_offset = 0;

if (structure->propertyAccessesAreCacheable() && !structure->needImpurePropertyWatchpoint()) {

{

ConcurrentJSLocker locker(codeBlock->m_lock);

metadata.m_structureID = structure->id();

metadata.m_offset = slot.cachedOffset();

}

vm.writeBarrier(codeBlock);

}

LLINT_RETURN_PROFILED(result);

}

LLINT_SLOW_PATH_DECL(slow_path_get_by_id_with_this)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpGetByIdWithThis>();

const Identifier& ident = codeBlock->identifier(bytecode.m_property);

JSValue baseValue = getOperand(callFrame, bytecode.m_base);

JSValue thisVal = getOperand(callFrame, bytecode.m_thisValue);

PropertySlot slot(thisVal, PropertySlot::PropertySlot::InternalMethodType::Get);

JSValue result = baseValue.get(globalObject, ident, slot);

LLINT_RETURN_PROFILED(result);

}

static void setupGetByIdPrototypeCache(JSGlobalObject* globalObject, VM& vm, CodeBlock* codeBlock, BytecodeIndex bytecodeIndex, GetByIdModeMetadata& metadata, JSCell* baseCell, PropertySlot& slot, const Identifier& ident)

{

Structure* structure = baseCell->structure();

if (structure->typeInfo().prohibitsPropertyCaching())

return;

if (structure->needImpurePropertyWatchpoint())

return;

if (structure->isDictionary()) {

if (structure->hasBeenFlattenedBefore())

return;

structure->flattenDictionaryStructure(vm, uncheckedDowncast<JSObject>(baseCell));

}

prepareChainForCaching(globalObject, baseCell, ident.impl(), slot);

ObjectPropertyConditionSet conditions;

if (slot.isUnset())

conditions = generateConditionsForPropertyMiss(vm, codeBlock, globalObject, structure, ident.impl());

else

conditions = generateConditionsForPrototypePropertyHit(vm, codeBlock, globalObject, structure, slot.slotBase(), ident.impl());

if (!conditions.isValid())

return;

PropertyOffset offset = invalidOffset;

CodeBlock::StructureWatchpointMap& watchpointMap = codeBlock->llintGetByIdWatchpointMap();

FixedVector<LLIntPrototypeLoadAdaptiveStructureWatchpoint> watchpoints(conditions.size());

unsigned index = 0;

for (ObjectPropertyCondition condition : conditions) {

auto& watchpoint = watchpoints[index++];

if (!condition.isWatchable(PropertyCondition::MakeNoChanges))

return;

if (condition.condition().kind() == PropertyCondition::Presence)

offset = condition.condition().offset();

watchpoint.initialize(codeBlock, condition, bytecodeIndex);

watchpoint.install(vm);

}

ASSERT((offset == invalidOffset) == slot.isUnset());

auto result = watchpointMap.add(std::make_tuple(structure->id(), bytecodeIndex), WTF::move(watchpoints));

ASSERT_UNUSED(result, result.isNewEntry);

{

ConcurrentJSLocker locker(codeBlock->m_lock);

if (slot.isUnset())

metadata.setUnsetMode(structure);

else {

ASSERT(slot.isValue());

metadata.setProtoLoadMode(structure, offset, slot.slotBase());

}

vm.writeBarrier(codeBlock);

}

static JSValue performLLIntGetByID(BytecodeIndex bytecodeIndex, CodeBlock* codeBlock, JSGlobalObject* globalObject, JSValue baseValue, const Identifier& ident, GetByIdModeMetadata& metadata)

{

VM& vm = globalObject->vm();

auto throwScope = DECLARE_THROW_SCOPE(vm);

PropertySlot slot(baseValue, PropertySlot::PropertySlot::InternalMethodType::Get);

JSValue result = baseValue.get<true>(globalObject, ident, slot);

RETURN_IF_EXCEPTION(throwScope, { });

if (Options::useLLIntICs()

&& baseValue.isCell()

&& slot.isCacheable()

&& !slot.isUnset()) {

{

StructureID oldStructureID;

switch (metadata.mode) {

case GetByIdMode::Default:

oldStructureID = metadata.defaultMode.structureID;

break;

case GetByIdMode::Unset:

oldStructureID = metadata.unsetMode.structureID;

break;

case GetByIdMode::ProtoLoad:

oldStructureID = metadata.protoLoadMode.structureID;

break;

default:

oldStructureID = StructureID();

}

if (oldStructureID) {

Structure* a = oldStructureID.decode();

Structure* b = baseValue.asCell()->structure();

if (Structure::shouldConvertToPolyProto(a, b)) {

ASSERT(a->rareData()->sharedPolyProtoWatchpoint().get() == b->rareData()->sharedPolyProtoWatchpoint().get());

a->rareData()->sharedPolyProtoWatchpoint()->invalidate(vm, StringFireDetail("Detected poly proto opportunity."));

}

JSCell* baseCell = baseValue.asCell();

Structure* structure = baseCell->structure();

if (slot.isValue() && slot.slotBase() == baseValue) {

ConcurrentJSLocker locker(codeBlock->m_lock);

// Start out by clearing out the old cache.

metadata.clearToDefaultModeWithoutCache();

// Prevent the prototype cache from ever happening.

metadata.hitCountForLLIntCaching = 0;

if (structure->propertyAccessesAreCacheable() && !structure->needImpurePropertyWatchpoint()) {

metadata.defaultMode.structureID = structure->id();

metadata.defaultMode.cachedOffset = slot.cachedOffset();

vm.writeBarrier(codeBlock);

}

} else if (metadata.hitCountForLLIntCaching && slot.isValue()) [[unlikely]] {

ASSERT(slot.slotBase() != baseValue);

if (!(--metadata.hitCountForLLIntCaching))

setupGetByIdPrototypeCache(globalObject, vm, codeBlock, bytecodeIndex, metadata, baseCell, slot, ident);

}

} else if (Options::useLLIntICs() && isJSArray(baseValue) && ident == vm.propertyNames->length)

metadata.setArrayLengthMode();

return result;

}

LLINT_SLOW_PATH_DECL(slow_path_get_by_id)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpGetById>();

auto& metadata = bytecode.metadata(codeBlock);

const Identifier& ident = codeBlock->identifier(bytecode.m_property);

JSValue baseValue = getOperand(callFrame, bytecode.m_base);

JSValue result = performLLIntGetByID(codeBlock->bytecodeIndex(pc), codeBlock, globalObject, baseValue, ident, metadata.m_modeMetadata);

LLINT_RETURN_PROFILED(result);

}

LLINT_SLOW_PATH_DECL(slow_path_get_length)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpGetLength>();

auto& metadata = bytecode.metadata(codeBlock);

const Identifier& ident = vm.propertyNames->length;

JSValue baseValue = getOperand(callFrame, bytecode.m_base);

if (baseValue.isCell())

metadata.m_arrayProfile.observeStructure(baseValue.asCell()->structure());

JSValue result = performLLIntGetByID(codeBlock->bytecodeIndex(pc), codeBlock, globalObject, baseValue, ident, metadata.m_modeMetadata);

LLINT_RETURN_PROFILED(result);

}

LLINT_SLOW_PATH_DECL(slow_path_iterator_open_get_next)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpIteratorOpen>();

auto& metadata = bytecode.metadata(codeBlock);

JSValue iterator = getOperand(callFrame, bytecode.m_iterator);

if (!iterator.isObject())

LLINT_THROW(createTypeError(globalObject, "Iterator result interface is not an object."_s));

JSValue result = performLLIntGetByID(codeBlock->bytecodeIndex(pc).withCheckpoint(OpIteratorOpen::getNext), codeBlock, globalObject, iterator, vm.propertyNames->next, metadata.m_modeMetadata);

LLINT_CHECK_EXCEPTION();

nextRegister = result;

codeBlock->valueProfileForOffset(bytecode.m_nextValueProfile).m_buckets[0] = JSValue::encode(result);

LLINT_END();

}

LLINT_SLOW_PATH_DECL(slow_path_iterator_next_get_done)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpIteratorNext>();

auto& metadata = bytecode.metadata(codeBlock);

// We use m_value to hold the iterator return value since it's either not live past this bytecode or it's going to be filled later.

JSValue iteratorReturn = getOperand(callFrame, bytecode.m_value);

if (!iteratorReturn.isObject())

LLINT_THROW(createTypeError(globalObject, "Iterator result interface is not an object."_s));

JSValue result = performLLIntGetByID(codeBlock->bytecodeIndex(pc).withCheckpoint(OpIteratorNext::getDone), codeBlock, globalObject, iteratorReturn, vm.propertyNames->done, metadata.m_doneModeMetadata);

LLINT_CHECK_EXCEPTION();

doneRegister = result;

codeBlock->valueProfileForOffset(bytecode.m_doneValueProfile).m_buckets[0] = JSValue::encode(result);

LLINT_END();

}

LLINT_SLOW_PATH_DECL(slow_path_iterator_next_get_value)

{

LLINT_BEGIN();

auto bytecode = pc->as<OpIteratorNext>();

auto& metadata = bytecode.metadata(codeBlock);

// We use m_value to hold the iterator return value tmp since it's either not live past this bytecode or it's going to be filled later.

JSValue iteratorReturn = valueRegister.jsValue();

if (callFrame->uncheckedR(bytecode.m_done).jsValue().toBoolean(globalObject))

LLINT_END();

JSValue result = performLLIntGetByID(codeBlock->bytecodeIndex(pc).withCheckpoint(OpIteratorNext::getValue), codeBlock, globalObject, iteratorReturn, vm.propertyNames->value, metadata.m_valueModeMetadata);

LLINT_CHECK_EXCEPTION();

valueRegister = result;

codeBlock->valueProfileForOffset(bytecode.m_valueValueProfile).m_buckets[0] = JSValue::encode(result);

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WebKit/Source/JavaScriptCore/llint/LLIntSlowPaths.cpp at main · WebKit/WebKit · GitHub

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