inline bool JSActivation::symbolTableGet(const Identifier& propertyName, PropertySlot& slot)
{
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
if (!entry.isNull()) {
ASSERT(entry.getIndex() < static_cast<int>(d()->functionExecutable->capturedVariableCount()));
slot.setRegisterSlot(®isterAt(entry.getIndex()));
return true;
}
return false;
}
inline bool JSActivation::symbolTableGet(const Identifier& propertyName, PropertySlot& slot)
{
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
if (entry.isNull())
return false;
if (entry.getIndex() >= m_numCapturedVars)
return false;
slot.setValue(registerAt(entry.getIndex()).get());
return true;
}
inline bool JSActivation::symbolTablePut(const Identifier& propertyName, JSValue value)
{
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
if (entry.isNull())
return false;
if (entry.isReadOnly())
return true;
ASSERT(entry.getIndex() < static_cast<int>(d()->functionExecutable->capturedVariableCount()));
registerAt(entry.getIndex()) = value;
return true;
}
inline bool JSActivation::symbolTablePut(JSGlobalData& globalData, const Identifier& propertyName, JSValue value)
{
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
if (entry.isNull())
return false;
if (entry.isReadOnly())
return true;
if (entry.getIndex() >= m_numCapturedVars)
return false;
registerAt(entry.getIndex()).set(globalData, this, value);
return true;
}
// Returns true if we found enough information to terminate optimization.
static inline bool abstractAccess(ExecState* exec, JSScope* scope, const Identifier& ident, GetOrPut getOrPut, size_t depth, bool& needsVarInjectionChecks, ResolveOp& op)
{
if (JSActivation* activation = jsDynamicCast<JSActivation*>(scope)) {
if (ident == exec->propertyNames().arguments) {
// We know the property will be at this activation scope, but we don't know how to cache it.
op = ResolveOp(Dynamic, 0, 0, 0, 0);
return true;
}
SymbolTableEntry entry = activation->symbolTable()->get(ident.impl());
if (entry.isReadOnly() && getOrPut == Put) {
// We know the property will be at this activation scope, but we don't know how to cache it.
op = ResolveOp(Dynamic, 0, 0, 0, 0);
return true;
}
if (!entry.isNull()) {
op = ResolveOp(makeType(ClosureVar, needsVarInjectionChecks), depth, activation->structure(), 0, entry.getIndex());
return true;
}
if (activation->symbolTable()->usesNonStrictEval())
needsVarInjectionChecks = true;
return false;
}
if (JSGlobalObject* globalObject = jsDynamicCast<JSGlobalObject*>(scope)) {
SymbolTableEntry entry = globalObject->symbolTable()->get(ident.impl());
if (!entry.isNull()) {
if (getOrPut == Put && entry.isReadOnly()) {
// We know the property will be at global scope, but we don't know how to cache it.
op = ResolveOp(Dynamic, 0, 0, 0, 0);
return true;
}
op = ResolveOp(
makeType(GlobalVar, needsVarInjectionChecks), depth, 0, entry.watchpointSet(),
reinterpret_cast<uintptr_t>(globalObject->registerAt(entry.getIndex()).slot()));
return true;
}
PropertySlot slot(globalObject);
if (!globalObject->getOwnPropertySlot(globalObject, exec, ident, slot)
|| !slot.isCacheableValue()
|| !globalObject->structure()->propertyAccessesAreCacheable()
|| (globalObject->structure()->hasReadOnlyOrGetterSetterPropertiesExcludingProto() && getOrPut == Put)) {
// We know the property will be at global scope, but we don't know how to cache it.
ASSERT(!scope->next());
op = ResolveOp(makeType(GlobalProperty, needsVarInjectionChecks), depth, 0, 0, 0);
return true;
}
op = ResolveOp(makeType(GlobalProperty, needsVarInjectionChecks), depth, globalObject->structure(), 0, slot.cachedOffset());
return true;
}
op = ResolveOp(Dynamic, 0, 0, 0, 0);
return true;
}
bool JSVariableObject::symbolTableGet(const Identifier& propertyName, PropertyDescriptor& descriptor)
{
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
if (!entry.isNull()) {
descriptor.setDescriptor(registerAt(entry.getIndex()).jsValue(), entry.getAttributes() | DontDelete);
return true;
}
return false;
}
inline bool JSActivation::symbolTablePut(ExecState* exec, PropertyName propertyName, JSValue value, bool shouldThrow)
{
JSGlobalData& globalData = exec->globalData();
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
SymbolTableEntry entry = symbolTable().inlineGet(propertyName.impl());
if (entry.isNull())
return false;
if (entry.isReadOnly()) {
if (shouldThrow)
throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
return true;
}
if (m_isTornOff && entry.getIndex() >= m_numCapturedVars)
return false;
registerAt(entry.getIndex()).set(globalData, this, value);
return true;
}
inline bool JSActivation::symbolTableGet(PropertyName propertyName, PropertyDescriptor& descriptor)
{
SymbolTableEntry entry = symbolTable()->inlineGet(propertyName.publicName());
if (entry.isNull())
return false;
// Defend against the inspector asking for a var after it has been optimized out.
if (isTornOff() && !isValid(entry))
return false;
descriptor.setDescriptor(registerAt(entry.getIndex()).get(), entry.getAttributes());
return true;
}
inline bool JSActivation::symbolTableGet(PropertyName propertyName, PropertySlot& slot)
{
SymbolTableEntry entry = symbolTable()->inlineGet(propertyName.publicName());
if (entry.isNull())
return false;
// Defend against the inspector asking for a var after it has been optimized out.
if (isTornOff() && !isValid(entry))
return false;
slot.setValue(this, DontEnum, registerAt(entry.getIndex()).get());
return true;
}
inline bool JSLexicalEnvironment::symbolTableGet(PropertyName propertyName, PropertyDescriptor& descriptor)
{
SymbolTableEntry entry = symbolTable()->inlineGet(propertyName.uid());
if (entry.isNull())
return false;
// Defend against the inspector asking for a var after it has been optimized out.
if (!isValid(entry))
return false;
descriptor.setDescriptor(registerAt(entry.getIndex()).get(), entry.getAttributes());
return true;
}
inline bool JSLexicalEnvironment::symbolTableGet(PropertyName propertyName, PropertySlot& slot)
{
SymbolTableEntry entry = symbolTable()->inlineGet(propertyName.uid());
if (entry.isNull())
return false;
// Defend against the inspector asking for a var after it has been optimized out.
if (!isValid(entry))
return false;
slot.setValue(this, DontEnum, registerAt(entry.getIndex()).get());
return true;
}
inline bool JSActivation::symbolTablePut(ExecState* exec, PropertyName propertyName, JSValue value, bool shouldThrow)
{
VM& vm = exec->vm();
ASSERT(!Heap::heap(value) || Heap::heap(value) == Heap::heap(this));
SymbolTableEntry entry = symbolTable()->inlineGet(propertyName.publicName());
if (entry.isNull())
return false;
if (entry.isReadOnly()) {
if (shouldThrow)
throwTypeError(exec, StrictModeReadonlyPropertyWriteError);
return true;
}
// Defend against the inspector asking for a var after it has been optimized out.
if (isTornOff() && !isValid(entry))
return false;
registerAt(entry.getIndex()).set(vm, this, value);
return true;
}
// Returns true if we found enough information to terminate optimization.
static inline bool abstractAccess(ExecState* exec, JSScope* scope, const Identifier& ident, GetOrPut getOrPut, size_t depth, bool& needsVarInjectionChecks, ResolveOp& op)
{
if (JSActivation* activation = jsDynamicCast<JSActivation*>(scope)) {
if (ident == exec->propertyNames().arguments) {
// We know the property will be at this activation scope, but we don't know how to cache it.
op = ResolveOp(Dynamic, 0, 0, 0, 0, 0);
return true;
}
SymbolTableEntry entry = activation->symbolTable()->get(ident.impl());
if (entry.isReadOnly() && getOrPut == Put) {
// We know the property will be at this activation scope, but we don't know how to cache it.
op = ResolveOp(Dynamic, 0, 0, 0, 0, 0);
return true;
}
if (!entry.isNull()) {
op = ResolveOp(makeType(ClosureVar, needsVarInjectionChecks), depth, 0, activation, entry.watchpointSet(), entry.getIndex());
return true;
}
if (activation->symbolTable()->usesNonStrictEval())
needsVarInjectionChecks = true;
return false;
}
if (JSGlobalObject* globalObject = jsDynamicCast<JSGlobalObject*>(scope)) {
SymbolTableEntry entry = globalObject->symbolTable()->get(ident.impl());
if (!entry.isNull()) {
if (getOrPut == Put && entry.isReadOnly()) {
// We know the property will be at global scope, but we don't know how to cache it.
op = ResolveOp(Dynamic, 0, 0, 0, 0, 0);
return true;
}
op = ResolveOp(
makeType(GlobalVar, needsVarInjectionChecks), depth, 0, 0, entry.watchpointSet(),
reinterpret_cast<uintptr_t>(globalObject->registerAt(entry.getIndex()).slot()));
return true;
}
PropertySlot slot(globalObject);
if (!globalObject->getOwnPropertySlot(globalObject, exec, ident, slot)
|| !slot.isCacheableValue()
|| !globalObject->structure()->propertyAccessesAreCacheable()
|| (globalObject->structure()->hasReadOnlyOrGetterSetterPropertiesExcludingProto() && getOrPut == Put)) {
// We know the property will be at global scope, but we don't know how to cache it.
ASSERT(!scope->next());
op = ResolveOp(makeType(GlobalProperty, needsVarInjectionChecks), depth, 0, 0, 0, 0);
return true;
}
WatchpointState state = globalObject->structure()->ensurePropertyReplacementWatchpointSet(exec->vm(), slot.cachedOffset())->state();
if (state == IsWatched && getOrPut == Put) {
// The field exists, but because the replacement watchpoint is still intact. This is
// kind of dangerous. We have two options:
// 1) Invalidate the watchpoint set. That would work, but it's possible that this code
// path never executes - in which case this would be unwise.
// 2) Have the invalidation happen at run-time. All we have to do is leave the code
// uncached. The only downside is slightly more work when this does execute.
// We go with option (2) here because it seems less evil.
op = ResolveOp(makeType(GlobalProperty, needsVarInjectionChecks), depth, 0, 0, 0, 0);
} else
op = ResolveOp(makeType(GlobalProperty, needsVarInjectionChecks), depth, globalObject->structure(), 0, 0, slot.cachedOffset());
return true;
}
op = ResolveOp(Dynamic, 0, 0, 0, 0, 0);
return true;
}