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/*
* Copyright (C) 2011-2019 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.
*/
#pragma once
#include "BytecodeStructs.h"
#include "CodeBlock.h"
#include "CodeSpecializationKind.h"
#include "DirectArguments.h"
#include "ExceptionHelpers.h"
#include "FunctionCodeBlock.h"
#include "JSImmutableButterfly.h"
#include "ScopedArguments.h"
#include "SlowPathReturnType.h"
#include "StackAlignment.h"
#include "VMInlines.h"
#include <wtf/StdLibExtras.h>
namespace JSC {
// The purpose of this namespace is to include slow paths that are shared
// between the interpreter and baseline JIT. They are written to be agnostic
// with respect to the slow-path calling convention, but they do rely on the
// JS code being executed more-or-less directly from bytecode (so the call
// frame layout is unmodified, making it potentially awkward to use these
// from any optimizing JIT, like the DFG).
namespace CommonSlowPaths {
ALWAYS_INLINE int numberOfExtraSlots(int argumentCountIncludingThis)
{
int frameSize = argumentCountIncludingThis + CallFrame::headerSizeInRegisters;
int alignedFrameSize = WTF::roundUpToMultipleOf(stackAlignmentRegisters(), frameSize);
return alignedFrameSize - frameSize;
}
ALWAYS_INLINE int numberOfStackPaddingSlots(CodeBlock* codeBlock, int argumentCountIncludingThis)
{
if (argumentCountIncludingThis >= codeBlock->numParameters())
return 0;
int alignedFrameSize = WTF::roundUpToMultipleOf(stackAlignmentRegisters(), argumentCountIncludingThis + CallFrame::headerSizeInRegisters);
int alignedFrameSizeForParameters = WTF::roundUpToMultipleOf(stackAlignmentRegisters(), codeBlock->numParameters() + CallFrame::headerSizeInRegisters);
return alignedFrameSizeForParameters - alignedFrameSize;
}
ALWAYS_INLINE int numberOfStackPaddingSlotsWithExtraSlots(CodeBlock* codeBlock, int argumentCountIncludingThis)
{
if (argumentCountIncludingThis >= codeBlock->numParameters())
return 0;
return numberOfStackPaddingSlots(codeBlock, argumentCountIncludingThis) + numberOfExtraSlots(argumentCountIncludingThis);
}
ALWAYS_INLINE CodeBlock* codeBlockFromCallFrameCallee(ExecState* exec, CodeSpecializationKind kind)
{
JSFunction* callee = jsCast<JSFunction*>(exec->jsCallee());
ASSERT(!callee->isHostFunction());
return callee->jsExecutable()->codeBlockFor(kind);
}
ALWAYS_INLINE int arityCheckFor(ExecState* exec, VM& vm, CodeSpecializationKind kind)
{
CodeBlock* newCodeBlock = codeBlockFromCallFrameCallee(exec, kind);
ASSERT(exec->argumentCountIncludingThis() < static_cast<unsigned>(newCodeBlock->numParameters()));
int padding = numberOfStackPaddingSlotsWithExtraSlots(newCodeBlock, exec->argumentCountIncludingThis());
Register* newStack = exec->registers() - WTF::roundUpToMultipleOf(stackAlignmentRegisters(), padding);
if (UNLIKELY(!vm.ensureStackCapacityFor(newStack)))
return -1;
return padding;
}
inline bool opInByVal(ExecState* exec, JSValue baseVal, JSValue propName, ArrayProfile* arrayProfile = nullptr)
{
VM& vm = exec->vm();
auto scope = DECLARE_THROW_SCOPE(vm);
if (!baseVal.isObject()) {
throwException(exec, scope, createInvalidInParameterError(exec, baseVal));
return false;
}
JSObject* baseObj = asObject(baseVal);
if (arrayProfile)
arrayProfile->observeStructure(baseObj->structure(vm));
uint32_t i;
if (propName.getUInt32(i)) {
if (arrayProfile)
arrayProfile->observeIndexedRead(vm, baseObj, i);
RELEASE_AND_RETURN(scope, baseObj->hasProperty(exec, i));
}
auto property = propName.toPropertyKey(exec);
RETURN_IF_EXCEPTION(scope, false);
RELEASE_AND_RETURN(scope, baseObj->hasProperty(exec, property));
}
inline void tryCachePutToScopeGlobal(
ExecState* exec, CodeBlock* codeBlock, OpPutToScope& bytecode, JSObject* scope,
PutPropertySlot& slot, const Identifier& ident)
{
// Covers implicit globals. Since they don't exist until they first execute, we didn't know how to cache them at compile time.
auto& metadata = bytecode.metadata(exec);
ResolveType resolveType = metadata.m_getPutInfo.resolveType();
switch (resolveType) {
case UnresolvedProperty:
case UnresolvedPropertyWithVarInjectionChecks: {
if (scope->isGlobalObject()) {
ResolveType newResolveType = needsVarInjectionChecks(resolveType) ? GlobalPropertyWithVarInjectionChecks : GlobalProperty;
resolveType = newResolveType; // Allow below caching mechanism to kick in.
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_getPutInfo = GetPutInfo(metadata.m_getPutInfo.resolveMode(), newResolveType, metadata.m_getPutInfo.initializationMode());
break;
}
FALLTHROUGH;
}
case GlobalProperty:
case GlobalPropertyWithVarInjectionChecks: {
// Global Lexical Binding Epoch is changed. Update op_get_from_scope from GlobalProperty to GlobalLexicalVar.
if (scope->isGlobalLexicalEnvironment()) {
JSGlobalLexicalEnvironment* globalLexicalEnvironment = jsCast<JSGlobalLexicalEnvironment*>(scope);
ResolveType newResolveType = needsVarInjectionChecks(resolveType) ? GlobalLexicalVarWithVarInjectionChecks : GlobalLexicalVar;
metadata.m_getPutInfo = GetPutInfo(metadata.m_getPutInfo.resolveMode(), newResolveType, metadata.m_getPutInfo.initializationMode());
SymbolTableEntry entry = globalLexicalEnvironment->symbolTable()->get(ident.impl());
ASSERT(!entry.isNull());
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_watchpointSet = entry.watchpointSet();
metadata.m_operand = reinterpret_cast<uintptr_t>(globalLexicalEnvironment->variableAt(entry.scopeOffset()).slot());
return;
}
break;
}
default:
return;
}
if (resolveType == GlobalProperty || resolveType == GlobalPropertyWithVarInjectionChecks) {
VM& vm = exec->vm();
JSGlobalObject* globalObject = codeBlock->globalObject();
ASSERT(globalObject == scope || globalObject->varInjectionWatchpoint()->hasBeenInvalidated());
if (!slot.isCacheablePut()
|| slot.base() != scope
|| scope != globalObject
|| !scope->structure(vm)->propertyAccessesAreCacheable())
return;
if (slot.type() == PutPropertySlot::NewProperty) {
// Don't cache if we've done a transition. We want to detect the first replace so that we
// can invalidate the watchpoint.
return;
}
scope->structure(vm)->didCachePropertyReplacement(vm, slot.cachedOffset());
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_structure.set(vm, codeBlock, scope->structure(vm));
metadata.m_operand = slot.cachedOffset();
}
}
inline void tryCacheGetFromScopeGlobal(
ExecState* exec, VM& vm, OpGetFromScope& bytecode, JSObject* scope, PropertySlot& slot, const Identifier& ident)
{
auto& metadata = bytecode.metadata(exec);
ResolveType resolveType = metadata.m_getPutInfo.resolveType();
switch (resolveType) {
case UnresolvedProperty:
case UnresolvedPropertyWithVarInjectionChecks: {
if (scope->isGlobalObject()) {
ResolveType newResolveType = needsVarInjectionChecks(resolveType) ? GlobalPropertyWithVarInjectionChecks : GlobalProperty;
resolveType = newResolveType; // Allow below caching mechanism to kick in.
ConcurrentJSLocker locker(exec->codeBlock()->m_lock);
metadata.m_getPutInfo = GetPutInfo(metadata.m_getPutInfo.resolveMode(), newResolveType, metadata.m_getPutInfo.initializationMode());
break;
}
FALLTHROUGH;
}
case GlobalProperty:
case GlobalPropertyWithVarInjectionChecks: {
// Global Lexical Binding Epoch is changed. Update op_get_from_scope from GlobalProperty to GlobalLexicalVar.
if (scope->isGlobalLexicalEnvironment()) {
JSGlobalLexicalEnvironment* globalLexicalEnvironment = jsCast<JSGlobalLexicalEnvironment*>(scope);
ResolveType newResolveType = needsVarInjectionChecks(resolveType) ? GlobalLexicalVarWithVarInjectionChecks : GlobalLexicalVar;
SymbolTableEntry entry = globalLexicalEnvironment->symbolTable()->get(ident.impl());
ASSERT(!entry.isNull());
ConcurrentJSLocker locker(exec->codeBlock()->m_lock);
metadata.m_getPutInfo = GetPutInfo(metadata.m_getPutInfo.resolveMode(), newResolveType, metadata.m_getPutInfo.initializationMode());
metadata.m_watchpointSet = entry.watchpointSet();
metadata.m_operand = reinterpret_cast<uintptr_t>(globalLexicalEnvironment->variableAt(entry.scopeOffset()).slot());
return;
}
break;
}
default:
return;
}
// Covers implicit globals. Since they don't exist until they first execute, we didn't know how to cache them at compile time.
if (resolveType == GlobalProperty || resolveType == GlobalPropertyWithVarInjectionChecks) {
CodeBlock* codeBlock = exec->codeBlock();
JSGlobalObject* globalObject = codeBlock->globalObject();
ASSERT(scope == globalObject || globalObject->varInjectionWatchpoint()->hasBeenInvalidated());
if (slot.isCacheableValue() && slot.slotBase() == scope && scope == globalObject && scope->structure(vm)->propertyAccessesAreCacheable()) {
Structure* structure = scope->structure(vm);
{
ConcurrentJSLocker locker(codeBlock->m_lock);
metadata.m_structure.set(vm, codeBlock, structure);
metadata.m_operand = slot.cachedOffset();
}
structure->startWatchingPropertyForReplacements(vm, slot.cachedOffset());
}
}
}
inline bool canAccessArgumentIndexQuickly(JSObject& object, uint32_t index)
{
switch (object.type()) {
case DirectArgumentsType: {
DirectArguments* directArguments = jsCast<DirectArguments*>(&object);
if (directArguments->isMappedArgumentInDFG(index))
return true;
break;
}
case ScopedArgumentsType: {
ScopedArguments* scopedArguments = jsCast<ScopedArguments*>(&object);
if (scopedArguments->isMappedArgumentInDFG(index))
return true;
break;
}
default:
break;
}
return false;
}
static ALWAYS_INLINE void putDirectWithReify(VM& vm, ExecState* exec, JSObject* baseObject, PropertyName propertyName, JSValue value, PutPropertySlot& slot, Structure** result = nullptr)
{
auto scope = DECLARE_THROW_SCOPE(vm);
if (baseObject->inherits<JSFunction>(vm)) {
jsCast<JSFunction*>(baseObject)->reifyLazyPropertyIfNeeded(vm, exec, propertyName);
RETURN_IF_EXCEPTION(scope, void());
}
if (result)
*result = baseObject->structure(vm);
scope.release();
baseObject->putDirect(vm, propertyName, value, slot);
}
static ALWAYS_INLINE void putDirectAccessorWithReify(VM& vm, ExecState* exec, JSObject* baseObject, PropertyName propertyName, GetterSetter* accessor, unsigned attribute)
{
auto scope = DECLARE_THROW_SCOPE(vm);
if (baseObject->inherits<JSFunction>(vm)) {
jsCast<JSFunction*>(baseObject)->reifyLazyPropertyIfNeeded(vm, exec, propertyName);
RETURN_IF_EXCEPTION(scope, void());
}
scope.release();
baseObject->putDirectAccessor(exec, propertyName, accessor, attribute);
}
inline JSArray* allocateNewArrayBuffer(VM& vm, Structure* structure, JSImmutableButterfly* immutableButterfly)
{
JSGlobalObject* globalObject = structure->globalObject();
Structure* originalStructure = globalObject->originalArrayStructureForIndexingType(immutableButterfly->indexingMode());
ASSERT(originalStructure->indexingMode() == immutableButterfly->indexingMode());
ASSERT(isCopyOnWrite(immutableButterfly->indexingMode()));
ASSERT(!structure->outOfLineCapacity());
JSArray* result = JSArray::createWithButterfly(vm, nullptr, originalStructure, immutableButterfly->toButterfly());
// FIXME: This works but it's slow. If we cared enough about the perf when having a bad time then we could fix it.
if (UNLIKELY(originalStructure != structure)) {
ASSERT(hasSlowPutArrayStorage(structure->indexingMode()));
ASSERT(globalObject->isHavingABadTime());
result->switchToSlowPutArrayStorage(vm);
ASSERT(result->butterfly() != immutableButterfly->toButterfly());
ASSERT(!result->butterfly()->arrayStorage()->m_sparseMap.get());
ASSERT(result->structureID() == structure->id());
}
return result;
}
} // namespace CommonSlowPaths
class ExecState;
struct Instruction;
#define SLOW_PATH
#define SLOW_PATH_DECL(name) \
extern "C" SlowPathReturnType SLOW_PATH name(ExecState* exec, const Instruction* pc)
#define SLOW_PATH_HIDDEN_DECL(name) \
SLOW_PATH_DECL(name) WTF_INTERNAL
SLOW_PATH_HIDDEN_DECL(slow_path_call_arityCheck);
SLOW_PATH_HIDDEN_DECL(slow_path_construct_arityCheck);
SLOW_PATH_HIDDEN_DECL(slow_path_create_direct_arguments);
SLOW_PATH_HIDDEN_DECL(slow_path_create_scoped_arguments);
SLOW_PATH_HIDDEN_DECL(slow_path_create_cloned_arguments);
SLOW_PATH_HIDDEN_DECL(slow_path_create_this);
SLOW_PATH_HIDDEN_DECL(slow_path_enter);
SLOW_PATH_HIDDEN_DECL(slow_path_get_callee);
SLOW_PATH_HIDDEN_DECL(slow_path_to_this);
SLOW_PATH_HIDDEN_DECL(slow_path_throw_tdz_error);
SLOW_PATH_HIDDEN_DECL(slow_path_check_tdz);
SLOW_PATH_HIDDEN_DECL(slow_path_throw_strict_mode_readonly_property_write_error);
SLOW_PATH_HIDDEN_DECL(slow_path_not);
SLOW_PATH_HIDDEN_DECL(slow_path_eq);
SLOW_PATH_HIDDEN_DECL(slow_path_neq);
SLOW_PATH_HIDDEN_DECL(slow_path_stricteq);
SLOW_PATH_HIDDEN_DECL(slow_path_nstricteq);
SLOW_PATH_HIDDEN_DECL(slow_path_less);
SLOW_PATH_HIDDEN_DECL(slow_path_lesseq);
SLOW_PATH_HIDDEN_DECL(slow_path_greater);
SLOW_PATH_HIDDEN_DECL(slow_path_greatereq);
SLOW_PATH_HIDDEN_DECL(slow_path_inc);
SLOW_PATH_HIDDEN_DECL(slow_path_dec);
SLOW_PATH_HIDDEN_DECL(slow_path_to_number);
SLOW_PATH_HIDDEN_DECL(slow_path_to_string);
SLOW_PATH_HIDDEN_DECL(slow_path_to_object);
SLOW_PATH_HIDDEN_DECL(slow_path_negate);
SLOW_PATH_HIDDEN_DECL(slow_path_add);
SLOW_PATH_HIDDEN_DECL(slow_path_mul);
SLOW_PATH_HIDDEN_DECL(slow_path_sub);
SLOW_PATH_HIDDEN_DECL(slow_path_div);
SLOW_PATH_HIDDEN_DECL(slow_path_mod);
SLOW_PATH_HIDDEN_DECL(slow_path_pow);
SLOW_PATH_HIDDEN_DECL(slow_path_lshift);
SLOW_PATH_HIDDEN_DECL(slow_path_rshift);
SLOW_PATH_HIDDEN_DECL(slow_path_urshift);
SLOW_PATH_HIDDEN_DECL(slow_path_unsigned);
SLOW_PATH_HIDDEN_DECL(slow_path_bitnot);
SLOW_PATH_HIDDEN_DECL(slow_path_bitand);
SLOW_PATH_HIDDEN_DECL(slow_path_bitor);
SLOW_PATH_HIDDEN_DECL(slow_path_bitxor);
SLOW_PATH_HIDDEN_DECL(slow_path_typeof);
SLOW_PATH_HIDDEN_DECL(slow_path_is_object);
SLOW_PATH_HIDDEN_DECL(slow_path_is_object_or_null);
SLOW_PATH_HIDDEN_DECL(slow_path_is_function);
SLOW_PATH_HIDDEN_DECL(slow_path_in_by_id);
SLOW_PATH_HIDDEN_DECL(slow_path_in_by_val);
SLOW_PATH_HIDDEN_DECL(slow_path_del_by_val);
SLOW_PATH_HIDDEN_DECL(slow_path_strcat);
SLOW_PATH_HIDDEN_DECL(slow_path_to_primitive);
SLOW_PATH_HIDDEN_DECL(slow_path_get_enumerable_length);
SLOW_PATH_HIDDEN_DECL(slow_path_has_generic_property);
SLOW_PATH_HIDDEN_DECL(slow_path_has_structure_property);
SLOW_PATH_HIDDEN_DECL(slow_path_has_indexed_property);
SLOW_PATH_HIDDEN_DECL(slow_path_get_direct_pname);
SLOW_PATH_HIDDEN_DECL(slow_path_get_property_enumerator);
SLOW_PATH_HIDDEN_DECL(slow_path_enumerator_structure_pname);
SLOW_PATH_HIDDEN_DECL(slow_path_enumerator_generic_pname);
SLOW_PATH_HIDDEN_DECL(slow_path_to_index_string);
SLOW_PATH_HIDDEN_DECL(slow_path_profile_type_clear_log);
SLOW_PATH_HIDDEN_DECL(slow_path_unreachable);
SLOW_PATH_HIDDEN_DECL(slow_path_create_lexical_environment);
SLOW_PATH_HIDDEN_DECL(slow_path_push_with_scope);
SLOW_PATH_HIDDEN_DECL(slow_path_resolve_scope);
SLOW_PATH_HIDDEN_DECL(slow_path_is_var_scope);
SLOW_PATH_HIDDEN_DECL(slow_path_resolve_scope_for_hoisting_func_decl_in_eval);
SLOW_PATH_HIDDEN_DECL(slow_path_create_promise);
SLOW_PATH_HIDDEN_DECL(slow_path_create_generator);
SLOW_PATH_HIDDEN_DECL(slow_path_create_async_generator);
SLOW_PATH_HIDDEN_DECL(slow_path_create_rest);
SLOW_PATH_HIDDEN_DECL(slow_path_get_by_id_with_this);
SLOW_PATH_HIDDEN_DECL(slow_path_get_by_val_with_this);
SLOW_PATH_HIDDEN_DECL(slow_path_put_by_id_with_this);
SLOW_PATH_HIDDEN_DECL(slow_path_put_by_val_with_this);
SLOW_PATH_HIDDEN_DECL(slow_path_define_data_property);
SLOW_PATH_HIDDEN_DECL(slow_path_define_accessor_property);
SLOW_PATH_HIDDEN_DECL(slow_path_throw_static_error);
SLOW_PATH_HIDDEN_DECL(slow_path_new_promise);
SLOW_PATH_HIDDEN_DECL(slow_path_new_generator);
SLOW_PATH_HIDDEN_DECL(slow_path_new_array_with_spread);
SLOW_PATH_HIDDEN_DECL(slow_path_new_array_buffer);
SLOW_PATH_HIDDEN_DECL(slow_path_spread);
using SlowPathFunction = SlowPathReturnType(SLOW_PATH *)(ExecState*, const Instruction*);
} // namespace JSC