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2902 lines (2459 loc) · 114 KB
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/*
* Copyright (C) 2011-2025 Apple Inc. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
* EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
* PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL APPLE INC. OR
* CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
* EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
* PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
* PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
* OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
* OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
#include "config.h"
#include "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 "JSAsyncFunction.h"
#include "JSAsyncGeneratorFunction.h"
#include "JSCInlines.h"
#include "JSCJSValue.h"
#include "JSGeneratorFunction.h"
#include "JSGlobalObjectFunctions.h"
#include "JSLexicalEnvironment.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)
Register* newTopOfStackRegister = reinterpret_cast<Register*>(newTopOfStack);
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));
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_try_get_by_id)
{
LLINT_BEGIN();
auto bytecode = pc->as<OpTryGetById>();
const Identifier& ident = codeBlock->identifier(bytecode.m_property);
JSValue baseValue = getOperand(callFrame, bytecode.m_base);
PropertySlot slot(baseValue, PropertySlot::PropertySlot::InternalMethodType::VMInquiry, &vm);
baseValue.getPropertySlot(globalObject, ident, slot);
JSValue result = slot.getPureResult();
if (Options::useLLIntICs() && slot.isCacheable() && !slot.isUnset()) {
ASSERT(!slot.isTaintedByOpaqueObject());
ASSERT(baseValue.isCell());
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() && slot.slotBase() == baseValue) {
// 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_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(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);
Register& nextRegister = callFrame->uncheckedR(bytecode.m_next);
if (!iterator.isObject())
LLINT_THROW(createTypeError(globalObject, "Iterator result interface is not an object."_s));