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// Copyright 2012 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * 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.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "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 THE COPYRIGHT
// OWNER 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 "v8.h"
#include "accessors.h"
#include "api.h"
#include "arguments.h"
#include "codegen.h"
#include "execution.h"
#include "ic-inl.h"
#include "runtime.h"
#include "stub-cache.h"
namespace v8 {
namespace internal {
#ifdef DEBUG
char IC::TransitionMarkFromState(IC::State state) {
switch (state) {
case UNINITIALIZED: return '0';
case PREMONOMORPHIC: return '.';
case MONOMORPHIC: return '1';
case MONOMORPHIC_PROTOTYPE_FAILURE: return '^';
case POLYMORPHIC: return 'P';
case MEGAMORPHIC: return 'N';
case GENERIC: return 'G';
// We never see the debugger states here, because the state is
// computed from the original code - not the patched code. Let
// these cases fall through to the unreachable code below.
case DEBUG_STUB: break;
}
UNREACHABLE();
return 0;
}
const char* GetTransitionMarkModifier(KeyedAccessStoreMode mode) {
if (mode == STORE_NO_TRANSITION_HANDLE_COW) return ".COW";
if (mode == STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS) {
return ".IGNORE_OOB";
}
if (IsGrowStoreMode(mode)) return ".GROW";
return "";
}
void IC::TraceIC(const char* type,
Handle<Object> name) {
if (FLAG_trace_ic) {
Code* new_target = raw_target();
State new_state = new_target->ic_state();
PrintF("[%s%s in ", new_target->is_keyed_stub() ? "Keyed" : "", type);
StackFrameIterator it(isolate());
while (it.frame()->fp() != this->fp()) it.Advance();
StackFrame* raw_frame = it.frame();
if (raw_frame->is_internal()) {
Code* apply_builtin = isolate()->builtins()->builtin(
Builtins::kFunctionApply);
if (raw_frame->unchecked_code() == apply_builtin) {
PrintF("apply from ");
it.Advance();
raw_frame = it.frame();
}
}
JavaScriptFrame::PrintTop(isolate(), stdout, false, true);
ExtraICState extra_state = new_target->extra_ic_state();
const char* modifier =
GetTransitionMarkModifier(
KeyedStoreIC::GetKeyedAccessStoreMode(extra_state));
PrintF(" (%c->%c%s)",
TransitionMarkFromState(state()),
TransitionMarkFromState(new_state),
modifier);
name->Print();
PrintF("]\n");
}
}
#define TRACE_GENERIC_IC(isolate, type, reason) \
do { \
if (FLAG_trace_ic) { \
PrintF("[%s patching generic stub in ", type); \
JavaScriptFrame::PrintTop(isolate, stdout, false, true); \
PrintF(" (%s)]\n", reason); \
} \
} while (false)
#else
#define TRACE_GENERIC_IC(isolate, type, reason)
#endif // DEBUG
#define TRACE_IC(type, name) \
ASSERT((TraceIC(type, name), true))
IC::IC(FrameDepth depth, Isolate* isolate)
: isolate_(isolate),
target_set_(false) {
// To improve the performance of the (much used) IC code, we unfold a few
// levels of the stack frame iteration code. This yields a ~35% speedup when
// running DeltaBlue and a ~25% speedup of gbemu with the '--nouse-ic' flag.
const Address entry =
Isolate::c_entry_fp(isolate->thread_local_top());
Address* pc_address =
reinterpret_cast<Address*>(entry + ExitFrameConstants::kCallerPCOffset);
Address fp = Memory::Address_at(entry + ExitFrameConstants::kCallerFPOffset);
// If there's another JavaScript frame on the stack or a
// StubFailureTrampoline, we need to look one frame further down the stack to
// find the frame pointer and the return address stack slot.
if (depth == EXTRA_CALL_FRAME) {
const int kCallerPCOffset = StandardFrameConstants::kCallerPCOffset;
pc_address = reinterpret_cast<Address*>(fp + kCallerPCOffset);
fp = Memory::Address_at(fp + StandardFrameConstants::kCallerFPOffset);
}
#ifdef DEBUG
StackFrameIterator it(isolate);
for (int i = 0; i < depth + 1; i++) it.Advance();
StackFrame* frame = it.frame();
ASSERT(fp == frame->fp() && pc_address == frame->pc_address());
#endif
fp_ = fp;
pc_address_ = StackFrame::ResolveReturnAddressLocation(pc_address);
target_ = handle(raw_target(), isolate);
state_ = target_->ic_state();
}
#ifdef ENABLE_DEBUGGER_SUPPORT
Address IC::OriginalCodeAddress() const {
HandleScope scope(isolate());
// Compute the JavaScript frame for the frame pointer of this IC
// structure. We need this to be able to find the function
// corresponding to the frame.
StackFrameIterator it(isolate());
while (it.frame()->fp() != this->fp()) it.Advance();
JavaScriptFrame* frame = JavaScriptFrame::cast(it.frame());
// Find the function on the stack and both the active code for the
// function and the original code.
JSFunction* function = frame->function();
Handle<SharedFunctionInfo> shared(function->shared(), isolate());
Code* code = shared->code();
ASSERT(Debug::HasDebugInfo(shared));
Code* original_code = Debug::GetDebugInfo(shared)->original_code();
ASSERT(original_code->IsCode());
// Get the address of the call site in the active code. This is the
// place where the call to DebugBreakXXX is and where the IC
// normally would be.
Address addr = Assembler::target_address_from_return_address(pc());
// Return the address in the original code. This is the place where
// the call which has been overwritten by the DebugBreakXXX resides
// and the place where the inline cache system should look.
intptr_t delta =
original_code->instruction_start() - code->instruction_start();
return addr + delta;
}
#endif
static bool HasInterceptorGetter(JSObject* object) {
return !object->GetNamedInterceptor()->getter()->IsUndefined();
}
static bool HasInterceptorSetter(JSObject* object) {
return !object->GetNamedInterceptor()->setter()->IsUndefined();
}
static void LookupForRead(Handle<Object> object,
Handle<String> name,
LookupResult* lookup) {
// Skip all the objects with named interceptors, but
// without actual getter.
while (true) {
object->Lookup(*name, lookup);
// Besides normal conditions (property not found or it's not
// an interceptor), bail out if lookup is not cacheable: we won't
// be able to IC it anyway and regular lookup should work fine.
if (!lookup->IsInterceptor() || !lookup->IsCacheable()) {
return;
}
Handle<JSObject> holder(lookup->holder(), lookup->isolate());
if (HasInterceptorGetter(*holder)) {
return;
}
holder->LocalLookupRealNamedProperty(*name, lookup);
if (lookup->IsFound()) {
ASSERT(!lookup->IsInterceptor());
return;
}
Handle<Object> proto(holder->GetPrototype(), lookup->isolate());
if (proto->IsNull()) {
ASSERT(!lookup->IsFound());
return;
}
object = proto;
}
}
bool CallIC::TryUpdateExtraICState(LookupResult* lookup,
Handle<Object> object) {
if (!lookup->IsConstantFunction()) return false;
JSFunction* function = lookup->GetConstantFunction();
if (!function->shared()->HasBuiltinFunctionId()) return false;
// Fetch the arguments passed to the called function.
const int argc = target()->arguments_count();
Address entry = isolate()->c_entry_fp(isolate()->thread_local_top());
Address fp = Memory::Address_at(entry + ExitFrameConstants::kCallerFPOffset);
Arguments args(argc + 1,
&Memory::Object_at(fp +
StandardFrameConstants::kCallerSPOffset +
argc * kPointerSize));
switch (function->shared()->builtin_function_id()) {
case kStringCharCodeAt:
case kStringCharAt:
if (object->IsString()) {
String* string = String::cast(*object);
// Check there's the right string value or wrapper in the receiver slot.
ASSERT(string == args[0] || string == JSValue::cast(args[0])->value());
// If we're in the default (fastest) state and the index is
// out of bounds, update the state to record this fact.
if (StringStubState::decode(extra_ic_state()) == DEFAULT_STRING_STUB &&
argc >= 1 && args[1]->IsNumber()) {
double index = DoubleToInteger(args.number_at(1));
if (index < 0 || index >= string->length()) {
extra_ic_state_ =
StringStubState::update(extra_ic_state(),
STRING_INDEX_OUT_OF_BOUNDS);
return true;
}
}
}
break;
default:
return false;
}
return false;
}
bool IC::TryRemoveInvalidPrototypeDependentStub(Handle<Object> receiver,
Handle<String> name) {
if (target()->is_call_stub()) {
LookupResult lookup(isolate());
LookupForRead(receiver, name, &lookup);
if (static_cast<CallIC*>(this)->TryUpdateExtraICState(&lookup, receiver)) {
return true;
}
}
if (target()->is_keyed_stub()) {
// Determine whether the failure is due to a name failure.
if (!name->IsName()) return false;
Name* stub_name = target()->FindFirstName();
if (*name != stub_name) return false;
}
InlineCacheHolderFlag cache_holder =
Code::ExtractCacheHolderFromFlags(target()->flags());
switch (cache_holder) {
case OWN_MAP:
// The stub was generated for JSObject but called for non-JSObject.
// IC::GetCodeCacheHolder is not applicable.
if (!receiver->IsJSObject()) return false;
break;
case PROTOTYPE_MAP:
// IC::GetCodeCacheHolder is not applicable.
if (receiver->GetPrototype(isolate())->IsNull()) return false;
break;
}
Handle<Map> map(
IC::GetCodeCacheHolder(isolate(), *receiver, cache_holder)->map());
// Decide whether the inline cache failed because of changes to the
// receiver itself or changes to one of its prototypes.
//
// If there are changes to the receiver itself, the map of the
// receiver will have changed and the current target will not be in
// the receiver map's code cache. Therefore, if the current target
// is in the receiver map's code cache, the inline cache failed due
// to prototype check failure.
int index = map->IndexInCodeCache(*name, *target());
if (index >= 0) {
map->RemoveFromCodeCache(*name, *target(), index);
// Handlers are stored in addition to the ICs on the map. Remove those, too.
TryRemoveInvalidHandlers(map, name);
return true;
}
// The stub is not in the cache. We've ruled out all other kinds of failure
// except for proptotype chain changes, a deprecated map, a map that's
// different from the one that the stub expects, elements kind changes, or a
// constant global property that will become mutable. Threat all those
// situations as prototype failures (stay monomorphic if possible).
// If the IC is shared between multiple receivers (slow dictionary mode), then
// the map cannot be deprecated and the stub invalidated.
if (cache_holder == OWN_MAP) {
Map* old_map = target()->FindFirstMap();
if (old_map == *map) return true;
if (old_map != NULL) {
if (old_map->is_deprecated()) return true;
if (IsMoreGeneralElementsKindTransition(old_map->elements_kind(),
map->elements_kind())) {
return true;
}
}
}
if (receiver->IsGlobalObject()) {
LookupResult lookup(isolate());
GlobalObject* global = GlobalObject::cast(*receiver);
global->LocalLookupRealNamedProperty(*name, &lookup);
if (!lookup.IsFound()) return false;
PropertyCell* cell = global->GetPropertyCell(&lookup);
return cell->type()->IsConstant();
}
return false;
}
void IC::TryRemoveInvalidHandlers(Handle<Map> map, Handle<String> name) {
CodeHandleList handlers;
target()->FindHandlers(&handlers);
for (int i = 0; i < handlers.length(); i++) {
Handle<Code> handler = handlers.at(i);
int index = map->IndexInCodeCache(*name, *handler);
if (index >= 0) {
map->RemoveFromCodeCache(*name, *handler, index);
return;
}
}
}
void IC::UpdateState(Handle<Object> receiver, Handle<Object> name) {
if (!name->IsString()) return;
if (state() != MONOMORPHIC) {
if (state() == POLYMORPHIC && receiver->IsHeapObject()) {
TryRemoveInvalidHandlers(
handle(Handle<HeapObject>::cast(receiver)->map()),
Handle<String>::cast(name));
}
return;
}
if (receiver->IsUndefined() || receiver->IsNull()) return;
// Remove the target from the code cache if it became invalid
// because of changes in the prototype chain to avoid hitting it
// again.
if (TryRemoveInvalidPrototypeDependentStub(
receiver, Handle<String>::cast(name))) {
return MarkMonomorphicPrototypeFailure();
}
// The builtins object is special. It only changes when JavaScript
// builtins are loaded lazily. It is important to keep inline
// caches for the builtins object monomorphic. Therefore, if we get
// an inline cache miss for the builtins object after lazily loading
// JavaScript builtins, we return uninitialized as the state to
// force the inline cache back to monomorphic state.
if (receiver->IsJSBuiltinsObject()) state_ = UNINITIALIZED;
}
RelocInfo::Mode IC::ComputeMode() {
Address addr = address();
Code* code = Code::cast(isolate()->FindCodeObject(addr));
for (RelocIterator it(code, RelocInfo::kCodeTargetMask);
!it.done(); it.next()) {
RelocInfo* info = it.rinfo();
if (info->pc() == addr) return info->rmode();
}
UNREACHABLE();
return RelocInfo::NONE32;
}
Failure* IC::TypeError(const char* type,
Handle<Object> object,
Handle<Object> key) {
HandleScope scope(isolate());
Handle<Object> args[2] = { key, object };
Handle<Object> error = isolate()->factory()->NewTypeError(
type, HandleVector(args, 2));
return isolate()->Throw(*error);
}
Failure* IC::ReferenceError(const char* type, Handle<String> name) {
HandleScope scope(isolate());
Handle<Object> error = isolate()->factory()->NewReferenceError(
type, HandleVector(&name, 1));
return isolate()->Throw(*error);
}
static int ComputeTypeInfoCountDelta(IC::State old_state, IC::State new_state) {
bool was_uninitialized =
old_state == UNINITIALIZED || old_state == PREMONOMORPHIC;
bool is_uninitialized =
new_state == UNINITIALIZED || new_state == PREMONOMORPHIC;
return (was_uninitialized && !is_uninitialized) ? 1 :
(!was_uninitialized && is_uninitialized) ? -1 : 0;
}
void IC::PostPatching(Address address, Code* target, Code* old_target) {
if (FLAG_type_info_threshold == 0 && !FLAG_watch_ic_patching) {
return;
}
Isolate* isolate = target->GetHeap()->isolate();
Code* host = isolate->
inner_pointer_to_code_cache()->GetCacheEntry(address)->code;
if (host->kind() != Code::FUNCTION) return;
if (FLAG_type_info_threshold > 0 &&
old_target->is_inline_cache_stub() &&
target->is_inline_cache_stub()) {
int delta = ComputeTypeInfoCountDelta(old_target->ic_state(),
target->ic_state());
// Not all Code objects have TypeFeedbackInfo.
if (host->type_feedback_info()->IsTypeFeedbackInfo() && delta != 0) {
TypeFeedbackInfo* info =
TypeFeedbackInfo::cast(host->type_feedback_info());
info->change_ic_with_type_info_count(delta);
}
}
if (host->type_feedback_info()->IsTypeFeedbackInfo()) {
TypeFeedbackInfo* info =
TypeFeedbackInfo::cast(host->type_feedback_info());
info->change_own_type_change_checksum();
}
if (FLAG_watch_ic_patching) {
host->set_profiler_ticks(0);
isolate->runtime_profiler()->NotifyICChanged();
}
// TODO(2029): When an optimized function is patched, it would
// be nice to propagate the corresponding type information to its
// unoptimized version for the benefit of later inlining.
}
void IC::Clear(Isolate* isolate, Address address) {
Code* target = GetTargetAtAddress(address);
// Don't clear debug break inline cache as it will remove the break point.
if (target->is_debug_stub()) return;
switch (target->kind()) {
case Code::LOAD_IC: return LoadIC::Clear(isolate, address, target);
case Code::KEYED_LOAD_IC:
return KeyedLoadIC::Clear(isolate, address, target);
case Code::STORE_IC: return StoreIC::Clear(isolate, address, target);
case Code::KEYED_STORE_IC:
return KeyedStoreIC::Clear(isolate, address, target);
case Code::CALL_IC: return CallIC::Clear(address, target);
case Code::KEYED_CALL_IC: return KeyedCallIC::Clear(address, target);
case Code::COMPARE_IC: return CompareIC::Clear(isolate, address, target);
case Code::COMPARE_NIL_IC: return CompareNilIC::Clear(address, target);
case Code::BINARY_OP_IC:
case Code::TO_BOOLEAN_IC:
// Clearing these is tricky and does not
// make any performance difference.
return;
default: UNREACHABLE();
}
}
void CallICBase::Clear(Address address, Code* target) {
if (IsCleared(target)) return;
bool contextual = CallICBase::Contextual::decode(target->extra_ic_state());
Code* code =
target->GetIsolate()->stub_cache()->FindCallInitialize(
target->arguments_count(),
contextual ? RelocInfo::CODE_TARGET_CONTEXT : RelocInfo::CODE_TARGET,
target->kind());
SetTargetAtAddress(address, code);
}
void KeyedLoadIC::Clear(Isolate* isolate, Address address, Code* target) {
if (IsCleared(target)) return;
// Make sure to also clear the map used in inline fast cases. If we
// do not clear these maps, cached code can keep objects alive
// through the embedded maps.
SetTargetAtAddress(address, *pre_monomorphic_stub(isolate));
}
void LoadIC::Clear(Isolate* isolate, Address address, Code* target) {
if (IsCleared(target)) return;
SetTargetAtAddress(address, *pre_monomorphic_stub(isolate));
}
void StoreIC::Clear(Isolate* isolate, Address address, Code* target) {
if (IsCleared(target)) return;
SetTargetAtAddress(address,
*pre_monomorphic_stub(
isolate, StoreIC::GetStrictMode(target->extra_ic_state())));
}
void KeyedStoreIC::Clear(Isolate* isolate, Address address, Code* target) {
if (IsCleared(target)) return;
SetTargetAtAddress(address,
*pre_monomorphic_stub(
isolate, StoreIC::GetStrictMode(target->extra_ic_state())));
}
void CompareIC::Clear(Isolate* isolate, Address address, Code* target) {
ASSERT(target->major_key() == CodeStub::CompareIC);
CompareIC::State handler_state;
Token::Value op;
ICCompareStub::DecodeMinorKey(target->stub_info(), NULL, NULL,
&handler_state, &op);
// Only clear CompareICs that can retain objects.
if (handler_state != KNOWN_OBJECT) return;
SetTargetAtAddress(address, GetRawUninitialized(isolate, op));
PatchInlinedSmiCode(address, DISABLE_INLINED_SMI_CHECK);
}
Handle<Object> CallICBase::TryCallAsFunction(Handle<Object> object) {
Handle<Object> delegate = Execution::GetFunctionDelegate(isolate(), object);
if (delegate->IsJSFunction() && !object->IsJSFunctionProxy()) {
// Patch the receiver and use the delegate as the function to
// invoke. This is used for invoking objects as if they were functions.
const int argc = target()->arguments_count();
StackFrameLocator locator(isolate());
JavaScriptFrame* frame = locator.FindJavaScriptFrame(0);
int index = frame->ComputeExpressionsCount() - (argc + 1);
frame->SetExpression(index, *object);
}
return delegate;
}
void CallICBase::ReceiverToObjectIfRequired(Handle<Object> callee,
Handle<Object> object) {
while (callee->IsJSFunctionProxy()) {
callee = Handle<Object>(JSFunctionProxy::cast(*callee)->call_trap(),
isolate());
}
if (callee->IsJSFunction()) {
Handle<JSFunction> function = Handle<JSFunction>::cast(callee);
if (!function->shared()->is_classic_mode() || function->IsBuiltin()) {
// Do not wrap receiver for strict mode functions or for builtins.
return;
}
}
// And only wrap string, number or boolean.
if (object->IsString() || object->IsNumber() || object->IsBoolean()) {
// Change the receiver to the result of calling ToObject on it.
const int argc = this->target()->arguments_count();
StackFrameLocator locator(isolate());
JavaScriptFrame* frame = locator.FindJavaScriptFrame(0);
int index = frame->ComputeExpressionsCount() - (argc + 1);
frame->SetExpression(index, *isolate()->factory()->ToObject(object));
}
}
static bool MigrateDeprecated(Handle<Object> object) {
if (!object->IsJSObject()) return false;
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
if (!receiver->map()->is_deprecated()) return false;
JSObject::MigrateInstance(Handle<JSObject>::cast(object));
return true;
}
MaybeObject* CallICBase::LoadFunction(Handle<Object> object,
Handle<String> name) {
bool use_ic = MigrateDeprecated(object) ? false : FLAG_use_ic;
// If the object is undefined or null it's illegal to try to get any
// of its properties; throw a TypeError in that case.
if (object->IsUndefined() || object->IsNull()) {
return TypeError("non_object_property_call", object, name);
}
// Check if the name is trivially convertible to an index and get
// the element if so.
uint32_t index;
if (name->AsArrayIndex(&index)) {
Handle<Object> result = Object::GetElement(isolate(), object, index);
RETURN_IF_EMPTY_HANDLE(isolate(), result);
if (result->IsJSFunction()) return *result;
// Try to find a suitable function delegate for the object at hand.
result = TryCallAsFunction(result);
if (result->IsJSFunction()) return *result;
// Otherwise, it will fail in the lookup step.
}
// Lookup the property in the object.
LookupResult lookup(isolate());
LookupForRead(object, name, &lookup);
if (!lookup.IsFound()) {
// If the object does not have the requested property, check which
// exception we need to throw.
return IsUndeclaredGlobal(object)
? ReferenceError("not_defined", name)
: TypeError("undefined_method", object, name);
}
// Lookup is valid: Update inline cache and stub cache.
if (use_ic) UpdateCaches(&lookup, object, name);
// Get the property.
PropertyAttributes attr;
Handle<Object> result =
Object::GetProperty(object, object, &lookup, name, &attr);
RETURN_IF_EMPTY_HANDLE(isolate(), result);
if (lookup.IsInterceptor() && attr == ABSENT) {
// If the object does not have the requested property, check which
// exception we need to throw.
return IsUndeclaredGlobal(object)
? ReferenceError("not_defined", name)
: TypeError("undefined_method", object, name);
}
ASSERT(!result->IsTheHole());
// Make receiver an object if the callee requires it. Strict mode or builtin
// functions do not wrap the receiver, non-strict functions and objects
// called as functions do.
ReceiverToObjectIfRequired(result, object);
if (result->IsJSFunction()) {
Handle<JSFunction> function = Handle<JSFunction>::cast(result);
#ifdef ENABLE_DEBUGGER_SUPPORT
// Handle stepping into a function if step into is active.
Debug* debug = isolate()->debug();
if (debug->StepInActive()) {
// Protect the result in a handle as the debugger can allocate and might
// cause GC.
debug->HandleStepIn(function, object, fp(), false);
}
#endif
return *function;
}
// Try to find a suitable function delegate for the object at hand.
result = TryCallAsFunction(result);
if (result->IsJSFunction()) return *result;
return TypeError("property_not_function", object, name);
}
Handle<Code> CallICBase::ComputeMonomorphicStub(LookupResult* lookup,
Handle<Object> object,
Handle<String> name) {
int argc = target()->arguments_count();
Handle<JSObject> holder(lookup->holder(), isolate());
switch (lookup->type()) {
case FIELD: {
PropertyIndex index = lookup->GetFieldIndex();
return isolate()->stub_cache()->ComputeCallField(
argc, kind_, extra_ic_state(), name, object, holder, index);
}
case CONSTANT: {
if (!lookup->IsConstantFunction()) return Handle<Code>::null();
// Get the constant function and compute the code stub for this
// call; used for rewriting to monomorphic state and making sure
// that the code stub is in the stub cache.
Handle<JSFunction> function(lookup->GetConstantFunction(), isolate());
return isolate()->stub_cache()->ComputeCallConstant(
argc, kind_, extra_ic_state(), name, object, holder, function);
}
case NORMAL: {
// If we return a null handle, the IC will not be patched.
if (!object->IsJSObject()) return Handle<Code>::null();
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
if (holder->IsGlobalObject()) {
Handle<GlobalObject> global = Handle<GlobalObject>::cast(holder);
Handle<PropertyCell> cell(
global->GetPropertyCell(lookup), isolate());
if (!cell->value()->IsJSFunction()) return Handle<Code>::null();
Handle<JSFunction> function(JSFunction::cast(cell->value()));
return isolate()->stub_cache()->ComputeCallGlobal(
argc, kind_, extra_ic_state(), name,
receiver, global, cell, function);
} else {
// There is only one shared stub for calling normalized
// properties. It does not traverse the prototype chain, so the
// property must be found in the receiver for the stub to be
// applicable.
if (!holder.is_identical_to(receiver)) return Handle<Code>::null();
return isolate()->stub_cache()->ComputeCallNormal(
argc, kind_, extra_ic_state());
}
break;
}
case INTERCEPTOR:
ASSERT(HasInterceptorGetter(*holder));
return isolate()->stub_cache()->ComputeCallInterceptor(
argc, kind_, extra_ic_state(), name, object, holder);
default:
return Handle<Code>::null();
}
}
Handle<Code> CallICBase::megamorphic_stub() {
return isolate()->stub_cache()->ComputeCallMegamorphic(
target()->arguments_count(), kind_, extra_ic_state());
}
Handle<Code> CallICBase::pre_monomorphic_stub() {
return isolate()->stub_cache()->ComputeCallPreMonomorphic(
target()->arguments_count(), kind_, extra_ic_state());
}
void CallICBase::UpdateCaches(LookupResult* lookup,
Handle<Object> object,
Handle<String> name) {
// Bail out if we didn't find a result.
if (!lookup->IsProperty() || !lookup->IsCacheable()) return;
if (state() == UNINITIALIZED) {
set_target(*pre_monomorphic_stub());
TRACE_IC("CallIC", name);
return;
}
Handle<Code> code = ComputeMonomorphicStub(lookup, object, name);
// If there's no appropriate stub we simply avoid updating the caches.
// TODO(verwaest): Install a slow fallback in this case to avoid not learning,
// and deopting Crankshaft code.
if (code.is_null()) return;
Handle<JSObject> cache_object = object->IsJSObject()
? Handle<JSObject>::cast(object)
: Handle<JSObject>(JSObject::cast(object->GetPrototype(isolate())),
isolate());
PatchCache(CurrentTypeOf(cache_object, isolate()), name, code);
TRACE_IC("CallIC", name);
}
MaybeObject* KeyedCallIC::LoadFunction(Handle<Object> object,
Handle<Object> key) {
if (key->IsInternalizedString()) {
return CallICBase::LoadFunction(object, Handle<String>::cast(key));
}
if (object->IsUndefined() || object->IsNull()) {
return TypeError("non_object_property_call", object, key);
}
bool use_ic = MigrateDeprecated(object)
? false : FLAG_use_ic && !object->IsAccessCheckNeeded();
if (use_ic && state() != MEGAMORPHIC) {
ASSERT(!object->IsJSGlobalProxy());
int argc = target()->arguments_count();
Handle<Code> stub;
// Use the KeyedArrayCallStub if the call is of the form array[smi](...),
// where array is an instance of one of the initial array maps (without
// extra named properties).
// TODO(verwaest): Also support keyed calls on instances of other maps.
if (object->IsJSArray() && key->IsSmi()) {
Handle<JSArray> array = Handle<JSArray>::cast(object);
ElementsKind kind = array->map()->elements_kind();
if (IsFastObjectElementsKind(kind) &&
array->map() == isolate()->get_initial_js_array_map(kind)) {
KeyedArrayCallStub stub_gen(IsHoleyElementsKind(kind), argc);
stub = stub_gen.GetCode(isolate());
}
}
if (stub.is_null()) {
stub = isolate()->stub_cache()->ComputeCallMegamorphic(
argc, Code::KEYED_CALL_IC, kNoExtraICState);
if (object->IsJSObject()) {
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
if (receiver->elements()->map() ==
isolate()->heap()->non_strict_arguments_elements_map()) {
stub = isolate()->stub_cache()->ComputeCallArguments(argc);
}
}
ASSERT(!stub.is_null());
}
set_target(*stub);
TRACE_IC("CallIC", key);
}
Handle<Object> result = GetProperty(isolate(), object, key);
RETURN_IF_EMPTY_HANDLE(isolate(), result);
// Make receiver an object if the callee requires it. Strict mode or builtin
// functions do not wrap the receiver, non-strict functions and objects
// called as functions do.
ReceiverToObjectIfRequired(result, object);
if (result->IsJSFunction()) return *result;
result = TryCallAsFunction(result);
if (result->IsJSFunction()) return *result;
return TypeError("property_not_function", object, key);
}
MaybeObject* LoadIC::Load(Handle<Object> object,
Handle<String> name) {
// If the object is undefined or null it's illegal to try to get any
// of its properties; throw a TypeError in that case.
if (object->IsUndefined() || object->IsNull()) {
return TypeError("non_object_property_load", object, name);
}
if (FLAG_use_ic) {
// Use specialized code for getting the length of strings and
// string wrapper objects. The length property of string wrapper
// objects is read-only and therefore always returns the length of
// the underlying string value. See ECMA-262 15.5.5.1.
if (object->IsStringWrapper() &&
name->Equals(isolate()->heap()->length_string())) {
Handle<Code> stub;
if (state() == UNINITIALIZED) {
stub = pre_monomorphic_stub();
} else if (state() == PREMONOMORPHIC || state() == MONOMORPHIC) {
StringLengthStub string_length_stub(kind());
stub = string_length_stub.GetCode(isolate());
} else if (state() != MEGAMORPHIC) {
ASSERT(state() != GENERIC);
stub = megamorphic_stub();
}
if (!stub.is_null()) {
set_target(*stub);
if (FLAG_trace_ic) PrintF("[LoadIC : +#length /stringwrapper]\n");
}
// Get the string if we have a string wrapper object.
String* string = String::cast(JSValue::cast(*object)->value());
return Smi::FromInt(string->length());
}
// Use specialized code for getting prototype of functions.
if (object->IsJSFunction() &&
name->Equals(isolate()->heap()->prototype_string()) &&
Handle<JSFunction>::cast(object)->should_have_prototype()) {
Handle<Code> stub;
if (state() == UNINITIALIZED) {
stub = pre_monomorphic_stub();
} else if (state() == PREMONOMORPHIC) {
FunctionPrototypeStub function_prototype_stub(kind());
stub = function_prototype_stub.GetCode(isolate());
} else if (state() != MEGAMORPHIC) {
ASSERT(state() != GENERIC);
stub = megamorphic_stub();
}
if (!stub.is_null()) {
set_target(*stub);
if (FLAG_trace_ic) PrintF("[LoadIC : +#prototype /function]\n");
}
return *Accessors::FunctionGetPrototype(Handle<JSFunction>::cast(object));
}
}
// Check if the name is trivially convertible to an index and get
// the element or char if so.
uint32_t index;
if (kind() == Code::KEYED_LOAD_IC && name->AsArrayIndex(&index)) {
// Rewrite to the generic keyed load stub.
if (FLAG_use_ic) set_target(*generic_stub());
return Runtime::GetElementOrCharAtOrFail(isolate(), object, index);
}
bool use_ic = MigrateDeprecated(object) ? false : FLAG_use_ic;
// Named lookup in the object.
LookupResult lookup(isolate());
LookupForRead(object, name, &lookup);
// If we did not find a property, check if we need to throw an exception.
if (!lookup.IsFound()) {
if (IsUndeclaredGlobal(object)) {
return ReferenceError("not_defined", name);
}
LOG(isolate(), SuspectReadEvent(*name, *object));
}
// Update inline cache and stub cache.
if (use_ic) UpdateCaches(&lookup, object, name);
PropertyAttributes attr;
// Get the property.
Handle<Object> result =
Object::GetProperty(object, object, &lookup, name, &attr);
RETURN_IF_EMPTY_HANDLE(isolate(), result);
// If the property is not present, check if we need to throw an
// exception.
if ((lookup.IsInterceptor() || lookup.IsHandler()) &&
attr == ABSENT && IsUndeclaredGlobal(object)) {
return ReferenceError("not_defined", name);
}
return *result;
}
static bool AddOneReceiverMapIfMissing(MapHandleList* receiver_maps,
Handle<Map> new_receiver_map) {
ASSERT(!new_receiver_map.is_null());
for (int current = 0; current < receiver_maps->length(); ++current) {
if (!receiver_maps->at(current).is_null() &&
receiver_maps->at(current).is_identical_to(new_receiver_map)) {
return false;
}
}
receiver_maps->Add(new_receiver_map);
return true;
}
bool IC::UpdatePolymorphicIC(Handle<Type> type,
Handle<String> name,
Handle<Code> code) {
if (!code->is_handler()) return false;
TypeHandleList types;
CodeHandleList handlers;
int number_of_valid_types;
int handler_to_overwrite = -1;
target()->FindAllTypes(&types);
int number_of_types = types.length();
number_of_valid_types = number_of_types;
for (int i = 0; i < number_of_types; i++) {
Handle<Type> current_type = types.at(i);
// Filter out deprecated maps to ensure their instances get migrated.
if (current_type->IsClass() && current_type->AsClass()->is_deprecated()) {
number_of_valid_types--;
// If the receiver type is already in the polymorphic IC, this indicates
// there was a prototoype chain failure. In that case, just overwrite the
// handler.
} else if (type->IsCurrently(current_type)) {
ASSERT(handler_to_overwrite == -1);
number_of_valid_types--;
handler_to_overwrite = i;
}
}
if (number_of_valid_types >= 4) return false;
if (number_of_types == 0) return false;
if (!target()->FindHandlers(&handlers, types.length())) return false;
number_of_valid_types++;
if (handler_to_overwrite >= 0) {
handlers.Set(handler_to_overwrite, code);
} else {
types.Add(type);
handlers.Add(code);
}
Handle<Code> ic = isolate()->stub_cache()->ComputePolymorphicIC(
&types, &handlers, number_of_valid_types, name, extra_ic_state());
set_target(*ic);
return true;
}
Handle<Type> IC::CurrentTypeOf(Handle<Object> object, Isolate* isolate) {
Type* type = object->IsJSGlobalObject()
? Type::Constant(Handle<JSGlobalObject>::cast(object))
: Type::OfCurrently(object);
return handle(type, isolate);
}
Handle<Map> IC::TypeToMap(Type* type, Isolate* isolate) {
if (type->Is(Type::Number())) return isolate->factory()->heap_number_map();
if (type->Is(Type::Boolean())) return isolate->factory()->oddball_map();
if (type->IsConstant()) {
return handle(Handle<JSGlobalObject>::cast(type->AsConstant())->map());
}
ASSERT(type->IsClass());
return type->AsClass();
}
Type* IC::MapToType(Handle<Map> map) {
if (map->instance_type() == HEAP_NUMBER_TYPE) return Type::Number();
// The only oddballs that can be recorded in ICs are booleans.
if (map->instance_type() == ODDBALL_TYPE) return Type::Boolean();
return Type::Class(map);
}
void IC::UpdateMonomorphicIC(Handle<Type> type,
Handle<Code> handler,
Handle<String> name) {
if (!handler->is_handler()) return set_target(*handler);
Handle<Code> ic = isolate()->stub_cache()->ComputeMonomorphicIC(
name, type, handler, extra_ic_state());
set_target(*ic);
}
void IC::CopyICToMegamorphicCache(Handle<String> name) {
TypeHandleList types;
CodeHandleList handlers;
target()->FindAllTypes(&types);
if (!target()->FindHandlers(&handlers, types.length())) return;
for (int i = 0; i < types.length(); i++) {
UpdateMegamorphicCache(*types.at(i), *name, *handlers.at(i));
}
}
bool IC::IsTransitionOfMonomorphicTarget(Type* type) {
if (!type->IsClass()) return false;
Map* receiver_map = *type->AsClass();
Map* current_map = target()->FindFirstMap();
ElementsKind receiver_elements_kind = receiver_map->elements_kind();
bool more_general_transition =
IsMoreGeneralElementsKindTransition(
current_map->elements_kind(), receiver_elements_kind);
Map* transitioned_map = more_general_transition
? current_map->LookupElementsTransitionMap(receiver_elements_kind)
: NULL;
return transitioned_map == receiver_map;
}
void IC::PatchCache(Handle<Type> type,
Handle<String> name,
Handle<Code> code) {
switch (state()) {
case UNINITIALIZED:
case PREMONOMORPHIC:
case MONOMORPHIC_PROTOTYPE_FAILURE:
UpdateMonomorphicIC(type, code, name);
break;
case MONOMORPHIC: {
// For now, call stubs are allowed to rewrite to the same stub. This
// happens e.g., when the field does not contain a function.
ASSERT(target()->is_call_stub() ||
target()->is_keyed_call_stub() ||
!target().is_identical_to(code));
Code* old_handler = target()->FindFirstHandler();
if (old_handler == *code && IsTransitionOfMonomorphicTarget(*type)) {
UpdateMonomorphicIC(type, code, name);
break;
}
// Fall through.
}
case POLYMORPHIC:
if (!target()->is_keyed_stub()) {
if (UpdatePolymorphicIC(type, name, code)) break;
CopyICToMegamorphicCache(name);
}
set_target(*megamorphic_stub());
// Fall through.
case MEGAMORPHIC:
UpdateMegamorphicCache(*type, *name, *code);
break;
case DEBUG_STUB:
break;
case GENERIC:
UNREACHABLE();
break;
}
}
Handle<Code> LoadIC::SimpleFieldLoad(int offset,
bool inobject,
Representation representation) {
if (kind() == Code::LOAD_IC) {
LoadFieldStub stub(inobject, offset, representation);
return stub.GetCode(isolate());
} else {
KeyedLoadFieldStub stub(inobject, offset, representation);
return stub.GetCode(isolate());
}
}
void LoadIC::UpdateCaches(LookupResult* lookup,
Handle<Object> object,
Handle<String> name) {
if (state() == UNINITIALIZED) {
// This is the first time we execute this inline cache.
// Set the target to the pre monomorphic stub to delay
// setting the monomorphic state.
set_target(*pre_monomorphic_stub());
TRACE_IC("LoadIC", name);
return;
}
Handle<Type> type = CurrentTypeOf(object, isolate());
Handle<Code> code;
if (!lookup->IsCacheable()) {
// Bail out if the result is not cacheable.
code = slow_stub();
} else if (!lookup->IsProperty()) {
if (kind() == Code::LOAD_IC) {
code = isolate()->stub_cache()->ComputeLoadNonexistent(name, type);
} else {
code = slow_stub();
}
} else {
code = ComputeHandler(lookup, object, name);
}
PatchCache(type, name, code);
TRACE_IC("LoadIC", name);
}
void IC::UpdateMegamorphicCache(Type* type, Name* name, Code* code) {
// Cache code holding map should be consistent with
// GenerateMonomorphicCacheProbe.
Map* map = *TypeToMap(type, isolate());
isolate()->stub_cache()->Set(name, map, code);
}
Handle<Code> IC::ComputeHandler(LookupResult* lookup,
Handle<Object> object,
Handle<String> name,
Handle<Object> value) {
InlineCacheHolderFlag cache_holder = GetCodeCacheForObject(*object);
Handle<HeapObject> stub_holder(GetCodeCacheHolder(
isolate(), *object, cache_holder));
Handle<Code> code = isolate()->stub_cache()->FindHandler(
name, handle(stub_holder->map()), kind(), cache_holder);
if (!code.is_null()) return code;
code = CompileHandler(lookup, object, name, value, cache_holder);
ASSERT(code->is_handler());
if (code->type() != Code::NORMAL) {
HeapObject::UpdateMapCodeCache(stub_holder, name, code);
}
return code;
}
Handle<Code> LoadIC::CompileHandler(LookupResult* lookup,
Handle<Object> object,
Handle<String> name,
Handle<Object> unused,
InlineCacheHolderFlag cache_holder) {
if (object->IsString() && name->Equals(isolate()->heap()->length_string())) {
int length_index = String::kLengthOffset / kPointerSize;
return SimpleFieldLoad(length_index);
}
Handle<Type> type = CurrentTypeOf(object, isolate());
Handle<JSObject> holder(lookup->holder());
LoadStubCompiler compiler(isolate(), cache_holder, kind());
switch (lookup->type()) {
case FIELD: {
PropertyIndex field = lookup->GetFieldIndex();
if (object.is_identical_to(holder)) {
return SimpleFieldLoad(field.translate(holder),
field.is_inobject(holder),
lookup->representation());
}
return compiler.CompileLoadField(
type, holder, name, field, lookup->representation());
}
case CONSTANT: {
Handle<Object> constant(lookup->GetConstant(), isolate());
// TODO(2803): Don't compute a stub for cons strings because they cannot
// be embedded into code.
if (constant->IsConsString()) break;
return compiler.CompileLoadConstant(type, holder, name, constant);
}
case NORMAL:
if (kind() != Code::LOAD_IC) break;
if (holder->IsGlobalObject()) {
Handle<GlobalObject> global = Handle<GlobalObject>::cast(holder);
Handle<PropertyCell> cell(
global->GetPropertyCell(lookup), isolate());
Handle<Code> code = compiler.CompileLoadGlobal(
type, global, cell, name, lookup->IsDontDelete());
// TODO(verwaest): Move caching of these NORMAL stubs outside as well.
Handle<HeapObject> stub_holder(GetCodeCacheHolder(
isolate(), *object, cache_holder));
HeapObject::UpdateMapCodeCache(stub_holder, name, code);
return code;
}
// There is only one shared stub for loading normalized
// properties. It does not traverse the prototype chain, so the
// property must be found in the object for the stub to be
// applicable.
if (!object.is_identical_to(holder)) break;
return isolate()->builtins()->LoadIC_Normal();
case CALLBACKS: {
// Use simple field loads for some well-known callback properties.
if (object->IsJSObject()) {
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
Handle<Map> map(receiver->map());
int object_offset;
if (Accessors::IsJSObjectFieldAccessor(map, name, &object_offset)) {
return SimpleFieldLoad(object_offset / kPointerSize);
}
}
Handle<Object> callback(lookup->GetCallbackObject(), isolate());
if (callback->IsExecutableAccessorInfo()) {
Handle<ExecutableAccessorInfo> info =
Handle<ExecutableAccessorInfo>::cast(callback);
if (v8::ToCData<Address>(info->getter()) == 0) break;
if (!info->IsCompatibleReceiver(*object)) break;
return compiler.CompileLoadCallback(type, holder, name, info);
} else if (callback->IsAccessorPair()) {
Handle<Object> getter(Handle<AccessorPair>::cast(callback)->getter(),
isolate());
if (!getter->IsJSFunction()) break;
if (holder->IsGlobalObject()) break;
if (!holder->HasFastProperties()) break;
Handle<JSFunction> function = Handle<JSFunction>::cast(getter);
if (!object->IsJSObject() &&
!function->IsBuiltin() &&
function->shared()->is_classic_mode()) {
// Calling non-strict non-builtins with a value as the receiver
// requires boxing.
break;
}
CallOptimization call_optimization(function);
if (call_optimization.is_simple_api_call() &&
call_optimization.IsCompatibleReceiver(*object)) {
return compiler.CompileLoadCallback(
type, holder, name, call_optimization);
}
return compiler.CompileLoadViaGetter(type, holder, name, function);
}
// TODO(dcarney): Handle correctly.
if (callback->IsDeclaredAccessorInfo()) break;
ASSERT(callback->IsForeign());
// No IC support for old-style native accessors.
break;
}
case INTERCEPTOR:
ASSERT(HasInterceptorGetter(*holder));
return compiler.CompileLoadInterceptor(type, holder, name);
default:
break;
}
return slow_stub();
}
static Handle<Object> TryConvertKey(Handle<Object> key, Isolate* isolate) {
// This helper implements a few common fast cases for converting
// non-smi keys of keyed loads/stores to a smi or a string.
if (key->IsHeapNumber()) {
double value = Handle<HeapNumber>::cast(key)->value();
if (std::isnan(value)) {
key = isolate->factory()->nan_string();
} else {
int int_value = FastD2I(value);
if (value == int_value && Smi::IsValid(int_value)) {
key = Handle<Smi>(Smi::FromInt(int_value), isolate);
}
}
} else if (key->IsUndefined()) {
key = isolate->factory()->undefined_string();
}
return key;
}
Handle<Code> KeyedLoadIC::LoadElementStub(Handle<JSObject> receiver) {
// Don't handle megamorphic property accesses for INTERCEPTORS or CALLBACKS
// via megamorphic stubs, since they don't have a map in their relocation info
// and so the stubs can't be harvested for the object needed for a map check.
if (target()->type() != Code::NORMAL) {
TRACE_GENERIC_IC(isolate(), "KeyedIC", "non-NORMAL target type");
return generic_stub();
}
Handle<Map> receiver_map(receiver->map(), isolate());
MapHandleList target_receiver_maps;
if (state() == UNINITIALIZED || state() == PREMONOMORPHIC) {
// Optimistically assume that ICs that haven't reached the MONOMORPHIC state
// yet will do so and stay there.
return isolate()->stub_cache()->ComputeKeyedLoadElement(receiver_map);
}
if (target().is_identical_to(string_stub())) {
target_receiver_maps.Add(isolate()->factory()->string_map());
} else {
target()->FindAllMaps(&target_receiver_maps);
if (target_receiver_maps.length() == 0) {
return isolate()->stub_cache()->ComputeKeyedLoadElement(receiver_map);
}
}
// The first time a receiver is seen that is a transitioned version of the
// previous monomorphic receiver type, assume the new ElementsKind is the
// monomorphic type. This benefits global arrays that only transition
// once, and all call sites accessing them are faster if they remain
// monomorphic. If this optimistic assumption is not true, the IC will
// miss again and it will become polymorphic and support both the
// untransitioned and transitioned maps.
if (state() == MONOMORPHIC &&
IsMoreGeneralElementsKindTransition(
target_receiver_maps.at(0)->elements_kind(),
receiver->GetElementsKind())) {
return isolate()->stub_cache()->ComputeKeyedLoadElement(receiver_map);
}
ASSERT(state() != GENERIC);
// Determine the list of receiver maps that this call site has seen,
// adding the map that was just encountered.
if (!AddOneReceiverMapIfMissing(&target_receiver_maps, receiver_map)) {
// If the miss wasn't due to an unseen map, a polymorphic stub
// won't help, use the generic stub.
TRACE_GENERIC_IC(isolate(), "KeyedIC", "same map added twice");
return generic_stub();
}
// If the maximum number of receiver maps has been exceeded, use the generic
// version of the IC.
if (target_receiver_maps.length() > kMaxKeyedPolymorphism) {
TRACE_GENERIC_IC(isolate(), "KeyedIC", "max polymorph exceeded");
return generic_stub();
}
return isolate()->stub_cache()->ComputeLoadElementPolymorphic(
&target_receiver_maps);
}
MaybeObject* KeyedLoadIC::Load(Handle<Object> object, Handle<Object> key) {
if (MigrateDeprecated(object)) {
return Runtime::GetObjectPropertyOrFail(isolate(), object, key);
}
MaybeObject* maybe_object = NULL;
Handle<Code> stub = generic_stub();
// Check for values that can be converted into an internalized string directly
// or is representable as a smi.
key = TryConvertKey(key, isolate());
if (key->IsInternalizedString()) {
maybe_object = LoadIC::Load(object, Handle<String>::cast(key));
if (maybe_object->IsFailure()) return maybe_object;
} else if (FLAG_use_ic && !object->IsAccessCheckNeeded()) {
ASSERT(!object->IsJSGlobalProxy());
if (object->IsString() && key->IsNumber()) {
if (state() == UNINITIALIZED) stub = string_stub();
} else if (object->IsJSObject()) {
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
if (receiver->elements()->map() ==
isolate()->heap()->non_strict_arguments_elements_map()) {
stub = non_strict_arguments_stub();
} else if (receiver->HasIndexedInterceptor()) {
stub = indexed_interceptor_stub();
} else if (!key->ToSmi()->IsFailure() &&
(!target().is_identical_to(non_strict_arguments_stub()))) {
stub = LoadElementStub(receiver);
}
}
}
if (!is_target_set()) {
if (*stub == *generic_stub()) {
TRACE_GENERIC_IC(isolate(), "KeyedLoadIC", "set generic");
}
ASSERT(!stub.is_null());
set_target(*stub);
TRACE_IC("LoadIC", key);
}
if (maybe_object != NULL) return maybe_object;
return Runtime::GetObjectPropertyOrFail(isolate(), object, key);
}
static bool LookupForWrite(Handle<JSObject> receiver,
Handle<String> name,
Handle<Object> value,
LookupResult* lookup,
IC* ic) {
Handle<JSObject> holder = receiver;
receiver->Lookup(*name, lookup);
if (lookup->IsFound()) {
if (lookup->IsReadOnly() || !lookup->IsCacheable()) return false;
if (lookup->holder() == *receiver) {
if (lookup->IsInterceptor() && !HasInterceptorSetter(*receiver)) {
receiver->LocalLookupRealNamedProperty(*name, lookup);
return lookup->IsFound() &&
!lookup->IsReadOnly() &&
lookup->CanHoldValue(value) &&
lookup->IsCacheable();
}
return lookup->CanHoldValue(value);
}
if (lookup->IsPropertyCallbacks()) return true;
// JSGlobalProxy always goes via the runtime, so it's safe to cache.
if (receiver->IsJSGlobalProxy()) return true;
// Currently normal holders in the prototype chain are not supported. They
// would require a runtime positive lookup and verification that the details
// have not changed.
if (lookup->IsInterceptor() || lookup->IsNormal()) return false;
holder = Handle<JSObject>(lookup->holder(), lookup->isolate());
}
// While normally LookupTransition gets passed the receiver, in this case we
// pass the holder of the property that we overwrite. This keeps the holder in
// the LookupResult intact so we can later use it to generate a prototype
// chain check. This avoids a double lookup, but requires us to pass in the
// receiver when trying to fetch extra information from the transition.
receiver->map()->LookupTransition(*holder, *name, lookup);
if (!lookup->IsTransition()) return false;
PropertyDetails target_details =
lookup->GetTransitionDetails(receiver->map());
if (target_details.IsReadOnly()) return false;
// If the value that's being stored does not fit in the field that the
// instance would transition to, create a new transition that fits the value.
// This has to be done before generating the IC, since that IC will embed the
// transition target.
// Ensure the instance and its map were migrated before trying to update the
// transition target.
ASSERT(!receiver->map()->is_deprecated());
if (!value->FitsRepresentation(target_details.representation())) {
Handle<Map> target(lookup->GetTransitionMapFromMap(receiver->map()));
Map::GeneralizeRepresentation(
target, target->LastAdded(),
value->OptimalRepresentation(), FORCE_FIELD);
// Lookup the transition again since the transition tree may have changed
// entirely by the migration above.
receiver->map()->LookupTransition(*holder, *name, lookup);
if (!lookup->IsTransition()) return false;
ic->MarkMonomorphicPrototypeFailure();
}
return true;
}
MaybeObject* StoreIC::Store(Handle<Object> object,
Handle<String> name,
Handle<Object> value,
JSReceiver::StoreFromKeyed store_mode) {
if (MigrateDeprecated(object) || object->IsJSProxy()) {
Handle<Object> result = JSReceiver::SetProperty(
Handle<JSReceiver>::cast(object), name, value, NONE, strict_mode());
RETURN_IF_EMPTY_HANDLE(isolate(), result);
return *result;
}
// If the object is undefined or null it's illegal to try to set any
// properties on it; throw a TypeError in that case.
if (object->IsUndefined() || object->IsNull()) {
return TypeError("non_object_property_store", object, name);
}
// The length property of string values is read-only. Throw in strict mode.
if (strict_mode() == kStrictMode && object->IsString() &&
name->Equals(isolate()->heap()->length_string())) {
return TypeError("strict_read_only_property", object, name);
}
// Ignore other stores where the receiver is not a JSObject.
// TODO(1475): Must check prototype chains of object wrappers.
if (!object->IsJSObject()) return *value;
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
// Check if the given name is an array index.
uint32_t index;
if (name->AsArrayIndex(&index)) {
Handle<Object> result =
JSObject::SetElement(receiver, index, value, NONE, strict_mode());
RETURN_IF_EMPTY_HANDLE(isolate(), result);
return *value;
}
// Observed objects are always modified through the runtime.
if (FLAG_harmony_observation && receiver->map()->is_observed()) {
Handle<Object> result = JSReceiver::SetProperty(
receiver, name, value, NONE, strict_mode(), store_mode);
RETURN_IF_EMPTY_HANDLE(isolate(), result);
return *result;
}
// Use specialized code for setting the length of arrays with fast
// properties. Slow properties might indicate redefinition of the length
// property. Note that when redefined using Object.freeze, it's possible
// to have fast properties but a read-only length.
if (FLAG_use_ic &&
receiver->IsJSArray() &&
name->Equals(isolate()->heap()->length_string()) &&
Handle<JSArray>::cast(receiver)->AllowsSetElementsLength() &&
receiver->HasFastProperties() &&
!receiver->map()->is_frozen()) {
Handle<Code> stub =
StoreArrayLengthStub(kind(), strict_mode()).GetCode(isolate());
set_target(*stub);
TRACE_IC("StoreIC", name);
Handle<Object> result = JSReceiver::SetProperty(
receiver, name, value, NONE, strict_mode(), store_mode);
RETURN_IF_EMPTY_HANDLE(isolate(), result);
return *result;
}
LookupResult lookup(isolate());
bool can_store = LookupForWrite(receiver, name, value, &lookup, this);
if (!can_store &&
strict_mode() == kStrictMode &&
!(lookup.IsProperty() && lookup.IsReadOnly()) &&
IsUndeclaredGlobal(object)) {
// Strict mode doesn't allow setting non-existent global property.
return ReferenceError("not_defined", name);
}
if (FLAG_use_ic) {
if (state() == UNINITIALIZED) {
Handle<Code> stub = pre_monomorphic_stub();
set_target(*stub);
TRACE_IC("StoreIC", name);
} else if (can_store) {
UpdateCaches(&lookup, receiver, name, value);
} else if (!name->IsCacheable(isolate()) ||
lookup.IsNormal() ||
(lookup.IsField() && lookup.CanHoldValue(value))) {
Handle<Code> stub = generic_stub();
set_target(*stub);
}
}
// Set the property.
Handle<Object> result = JSReceiver::SetProperty(
receiver, name, value, NONE, strict_mode(), store_mode);
RETURN_IF_EMPTY_HANDLE(isolate(), result);
return *result;
}
void StoreIC::UpdateCaches(LookupResult* lookup,
Handle<JSObject> receiver,
Handle<String> name,
Handle<Object> value) {
ASSERT(lookup->IsFound());
// These are not cacheable, so we never see such LookupResults here.
ASSERT(!lookup->IsHandler());
Handle<Code> code = ComputeHandler(lookup, receiver, name, value);
PatchCache(CurrentTypeOf(receiver, isolate()), name, code);
TRACE_IC("StoreIC", name);
}
Handle<Code> StoreIC::CompileHandler(LookupResult* lookup,
Handle<Object> object,
Handle<String> name,
Handle<Object> value,
InlineCacheHolderFlag cache_holder) {
if (object->IsJSGlobalProxy()) return slow_stub();
ASSERT(cache_holder == OWN_MAP);
// This is currently guaranteed by checks in StoreIC::Store.
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
Handle<JSObject> holder(lookup->holder());
// Handlers do not use strict mode.
StoreStubCompiler compiler(isolate(), kNonStrictMode, kind());
switch (lookup->type()) {
case FIELD:
return compiler.CompileStoreField(receiver, lookup, name);
case TRANSITION: {
// Explicitly pass in the receiver map since LookupForWrite may have
// stored something else than the receiver in the holder.
Handle<Map> transition(
lookup->GetTransitionTarget(receiver->map()), isolate());
int descriptor = transition->LastAdded();
DescriptorArray* target_descriptors = transition->instance_descriptors();
PropertyDetails details = target_descriptors->GetDetails(descriptor);
if (details.type() == CALLBACKS || details.attributes() != NONE) break;
return compiler.CompileStoreTransition(
receiver, lookup, transition, name);
}
case NORMAL:
if (kind() == Code::KEYED_STORE_IC) break;
if (receiver->IsGlobalObject()) {
// The stub generated for the global object picks the value directly
// from the property cell. So the property must be directly on the
// global object.
Handle<GlobalObject> global = Handle<GlobalObject>::cast(receiver);
Handle<PropertyCell> cell(global->GetPropertyCell(lookup), isolate());
Handle<Type> union_type = PropertyCell::UpdatedType(cell, value);
StoreGlobalStub stub(union_type->IsConstant());
Handle<Code> code = stub.GetCodeCopyFromTemplate(
isolate(), receiver->map(), *cell);
// TODO(verwaest): Move caching of these NORMAL stubs outside as well.
HeapObject::UpdateMapCodeCache(receiver, name, code);
return code;
}
ASSERT(holder.is_identical_to(receiver));
return isolate()->builtins()->StoreIC_Normal();
case CALLBACKS: {
if (kind() == Code::KEYED_STORE_IC) break;
Handle<Object> callback(lookup->GetCallbackObject(), isolate());
if (callback->IsExecutableAccessorInfo()) {
Handle<ExecutableAccessorInfo> info =
Handle<ExecutableAccessorInfo>::cast(callback);
if (v8::ToCData<Address>(info->setter()) == 0) break;
if (!holder->HasFastProperties()) break;
if (!info->IsCompatibleReceiver(*receiver)) break;
return compiler.CompileStoreCallback(receiver, holder, name, info);
} else if (callback->IsAccessorPair()) {
Handle<Object> setter(
Handle<AccessorPair>::cast(callback)->setter(), isolate());
if (!setter->IsJSFunction()) break;
if (holder->IsGlobalObject()) break;
if (!holder->HasFastProperties()) break;
Handle<JSFunction> function = Handle<JSFunction>::cast(setter);
CallOptimization call_optimization(function);
if (call_optimization.is_simple_api_call() &&
call_optimization.IsCompatibleReceiver(*receiver)) {
return compiler.CompileStoreCallback(
receiver, holder, name, call_optimization);
}
return compiler.CompileStoreViaSetter(
receiver, holder, name, Handle<JSFunction>::cast(setter));
}
// TODO(dcarney): Handle correctly.
if (callback->IsDeclaredAccessorInfo()) break;
ASSERT(callback->IsForeign());
// No IC support for old-style native accessors.
break;
}
case INTERCEPTOR:
if (kind() == Code::KEYED_STORE_IC) break;
ASSERT(HasInterceptorSetter(*receiver));
return compiler.CompileStoreInterceptor(receiver, name);
case CONSTANT:
break;
case NONEXISTENT:
case HANDLER:
UNREACHABLE();
break;
}
return slow_stub();
}
Handle<Code> KeyedStoreIC::StoreElementStub(Handle<JSObject> receiver,
KeyedAccessStoreMode store_mode) {
// Don't handle megamorphic property accesses for INTERCEPTORS or CALLBACKS
// via megamorphic stubs, since they don't have a map in their relocation info
// and so the stubs can't be harvested for the object needed for a map check.
if (target()->type() != Code::NORMAL) {
TRACE_GENERIC_IC(isolate(), "KeyedIC", "non-NORMAL target type");
return generic_stub();
}
Handle<Map> receiver_map(receiver->map(), isolate());
if (state() == UNINITIALIZED || state() == PREMONOMORPHIC) {
// Optimistically assume that ICs that haven't reached the MONOMORPHIC state
// yet will do so and stay there.
Handle<Map> monomorphic_map = ComputeTransitionedMap(receiver, store_mode);
store_mode = GetNonTransitioningStoreMode(store_mode);
return isolate()->stub_cache()->ComputeKeyedStoreElement(
monomorphic_map, strict_mode(), store_mode);
}
MapHandleList target_receiver_maps;
target()->FindAllMaps(&target_receiver_maps);
if (target_receiver_maps.length() == 0) {
// In the case that there is a non-map-specific IC is installed (e.g. keyed
// stores into properties in dictionary mode), then there will be not
// receiver maps in the target.
return generic_stub();
}
// There are several special cases where an IC that is MONOMORPHIC can still
// transition to a different GetNonTransitioningStoreMode IC that handles a
// superset of the original IC. Handle those here if the receiver map hasn't
// changed or it has transitioned to a more general kind.
KeyedAccessStoreMode old_store_mode =
KeyedStoreIC::GetKeyedAccessStoreMode(target()->extra_ic_state());
Handle<Map> previous_receiver_map = target_receiver_maps.at(0);
if (state() == MONOMORPHIC) {
// If the "old" and "new" maps are in the same elements map family, stay
// MONOMORPHIC and use the map for the most generic ElementsKind.
Handle<Map> transitioned_receiver_map = receiver_map;
if (IsTransitionStoreMode(store_mode)) {
transitioned_receiver_map =
ComputeTransitionedMap(receiver, store_mode);
}
if (IsTransitionOfMonomorphicTarget(MapToType(transitioned_receiver_map))) {
// Element family is the same, use the "worst" case map.
store_mode = GetNonTransitioningStoreMode(store_mode);
return isolate()->stub_cache()->ComputeKeyedStoreElement(
transitioned_receiver_map, strict_mode(), store_mode);
} else if (*previous_receiver_map == receiver->map() &&
old_store_mode == STANDARD_STORE &&
(IsGrowStoreMode(store_mode) ||
store_mode == STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS ||
store_mode == STORE_NO_TRANSITION_HANDLE_COW)) {
// A "normal" IC that handles stores can switch to a version that can
// grow at the end of the array, handle OOB accesses or copy COW arrays
// and still stay MONOMORPHIC.
return isolate()->stub_cache()->ComputeKeyedStoreElement(
receiver_map, strict_mode(), store_mode);
}
}
ASSERT(state() != GENERIC);
bool map_added =
AddOneReceiverMapIfMissing(&target_receiver_maps, receiver_map);
if (IsTransitionStoreMode(store_mode)) {
Handle<Map> transitioned_receiver_map =
ComputeTransitionedMap(receiver, store_mode);
map_added |= AddOneReceiverMapIfMissing(&target_receiver_maps,
transitioned_receiver_map);
}
if (!map_added) {
// If the miss wasn't due to an unseen map, a polymorphic stub
// won't help, use the generic stub.
TRACE_GENERIC_IC(isolate(), "KeyedIC", "same map added twice");
return generic_stub();
}
// If the maximum number of receiver maps has been exceeded, use the generic
// version of the IC.
if (target_receiver_maps.length() > kMaxKeyedPolymorphism) {
TRACE_GENERIC_IC(isolate(), "KeyedIC", "max polymorph exceeded");
return generic_stub();
}
// Make sure all polymorphic handlers have the same store mode, otherwise the
// generic stub must be used.
store_mode = GetNonTransitioningStoreMode(store_mode);
if (old_store_mode != STANDARD_STORE) {
if (store_mode == STANDARD_STORE) {
store_mode = old_store_mode;
} else if (store_mode != old_store_mode) {
TRACE_GENERIC_IC(isolate(), "KeyedIC", "store mode mismatch");
return generic_stub();
}
}
// If the store mode isn't the standard mode, make sure that all polymorphic
// receivers are either external arrays, or all "normal" arrays. Otherwise,
// use the generic stub.
if (store_mode != STANDARD_STORE) {
int external_arrays = 0;
for (int i = 0; i < target_receiver_maps.length(); ++i) {
if (target_receiver_maps[i]->has_external_array_elements()) {
external_arrays++;
}
}
if (external_arrays != 0 &&
external_arrays != target_receiver_maps.length()) {
TRACE_GENERIC_IC(isolate(), "KeyedIC",
"unsupported combination of external and normal arrays");
return generic_stub();
}
}
return isolate()->stub_cache()->ComputeStoreElementPolymorphic(
&target_receiver_maps, store_mode, strict_mode());
}
Handle<Map> KeyedStoreIC::ComputeTransitionedMap(
Handle<JSObject> receiver,
KeyedAccessStoreMode store_mode) {
switch (store_mode) {
case STORE_TRANSITION_SMI_TO_OBJECT:
case STORE_TRANSITION_DOUBLE_TO_OBJECT:
case STORE_AND_GROW_TRANSITION_SMI_TO_OBJECT:
case STORE_AND_GROW_TRANSITION_DOUBLE_TO_OBJECT:
return JSObject::GetElementsTransitionMap(receiver, FAST_ELEMENTS);
case STORE_TRANSITION_SMI_TO_DOUBLE:
case STORE_AND_GROW_TRANSITION_SMI_TO_DOUBLE:
return JSObject::GetElementsTransitionMap(receiver, FAST_DOUBLE_ELEMENTS);
case STORE_TRANSITION_HOLEY_SMI_TO_OBJECT:
case STORE_TRANSITION_HOLEY_DOUBLE_TO_OBJECT:
case STORE_AND_GROW_TRANSITION_HOLEY_SMI_TO_OBJECT:
case STORE_AND_GROW_TRANSITION_HOLEY_DOUBLE_TO_OBJECT:
return JSObject::GetElementsTransitionMap(receiver,
FAST_HOLEY_ELEMENTS);
case STORE_TRANSITION_HOLEY_SMI_TO_DOUBLE:
case STORE_AND_GROW_TRANSITION_HOLEY_SMI_TO_DOUBLE:
return JSObject::GetElementsTransitionMap(receiver,
FAST_HOLEY_DOUBLE_ELEMENTS);
case STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS:
ASSERT(receiver->map()->has_external_array_elements());
// Fall through
case STORE_NO_TRANSITION_HANDLE_COW:
case STANDARD_STORE:
case STORE_AND_GROW_NO_TRANSITION:
return Handle<Map>(receiver->map(), isolate());
}
return Handle<Map>::null();
}
bool IsOutOfBoundsAccess(Handle<JSObject> receiver,
int index) {
if (receiver->IsJSArray()) {
return JSArray::cast(*receiver)->length()->IsSmi() &&
index >= Smi::cast(JSArray::cast(*receiver)->length())->value();
}
return index >= receiver->elements()->length();
}
KeyedAccessStoreMode KeyedStoreIC::GetStoreMode(Handle<JSObject> receiver,
Handle<Object> key,
Handle<Object> value) {
ASSERT(!key->ToSmi()->IsFailure());
Smi* smi_key = NULL;
key->ToSmi()->To(&smi_key);
int index = smi_key->value();
bool oob_access = IsOutOfBoundsAccess(receiver, index);
bool allow_growth = receiver->IsJSArray() && oob_access;
if (allow_growth) {
// Handle growing array in stub if necessary.
if (receiver->HasFastSmiElements()) {
if (value->IsHeapNumber()) {
if (receiver->HasFastHoleyElements()) {
return STORE_AND_GROW_TRANSITION_HOLEY_SMI_TO_DOUBLE;
} else {
return STORE_AND_GROW_TRANSITION_SMI_TO_DOUBLE;
}
}
if (value->IsHeapObject()) {
if (receiver->HasFastHoleyElements()) {
return STORE_AND_GROW_TRANSITION_HOLEY_SMI_TO_OBJECT;
} else {
return STORE_AND_GROW_TRANSITION_SMI_TO_OBJECT;
}
}
} else if (receiver->HasFastDoubleElements()) {
if (!value->IsSmi() && !value->IsHeapNumber()) {
if (receiver->HasFastHoleyElements()) {
return STORE_AND_GROW_TRANSITION_HOLEY_DOUBLE_TO_OBJECT;
} else {
return STORE_AND_GROW_TRANSITION_DOUBLE_TO_OBJECT;
}
}
}
return STORE_AND_GROW_NO_TRANSITION;
} else {
// Handle only in-bounds elements accesses.
if (receiver->HasFastSmiElements()) {
if (value->IsHeapNumber()) {
if (receiver->HasFastHoleyElements()) {
return STORE_TRANSITION_HOLEY_SMI_TO_DOUBLE;
} else {
return STORE_TRANSITION_SMI_TO_DOUBLE;
}
} else if (value->IsHeapObject()) {
if (receiver->HasFastHoleyElements()) {
return STORE_TRANSITION_HOLEY_SMI_TO_OBJECT;
} else {
return STORE_TRANSITION_SMI_TO_OBJECT;
}
}
} else if (receiver->HasFastDoubleElements()) {
if (!value->IsSmi() && !value->IsHeapNumber()) {
if (receiver->HasFastHoleyElements()) {
return STORE_TRANSITION_HOLEY_DOUBLE_TO_OBJECT;
} else {
return STORE_TRANSITION_DOUBLE_TO_OBJECT;
}
}
}
if (!FLAG_trace_external_array_abuse &&
receiver->map()->has_external_array_elements() && oob_access) {
return STORE_NO_TRANSITION_IGNORE_OUT_OF_BOUNDS;
}
Heap* heap = receiver->GetHeap();
if (receiver->elements()->map() == heap->fixed_cow_array_map()) {
return STORE_NO_TRANSITION_HANDLE_COW;
} else {
return STANDARD_STORE;
}
}
}
MaybeObject* KeyedStoreIC::Store(Handle<Object> object,
Handle<Object> key,
Handle<Object> value) {
if (MigrateDeprecated(object)) {
Handle<Object> result = Runtime::SetObjectProperty(isolate(), object,
key,
value,
NONE,
strict_mode());
RETURN_IF_EMPTY_HANDLE(isolate(), result);
return *result;
}
// Check for values that can be converted into an internalized string directly
// or is representable as a smi.
key = TryConvertKey(key, isolate());
MaybeObject* maybe_object = NULL;
Handle<Code> stub = generic_stub();
if (key->IsInternalizedString()) {
maybe_object = StoreIC::Store(object,
Handle<String>::cast(key),
value,
JSReceiver::MAY_BE_STORE_FROM_KEYED);
if (maybe_object->IsFailure()) return maybe_object;
} else {
bool use_ic = FLAG_use_ic && !object->IsAccessCheckNeeded() &&
!(FLAG_harmony_observation && object->IsJSObject() &&
JSObject::cast(*object)->map()->is_observed());
if (use_ic && !object->IsSmi()) {
// Don't use ICs for maps of the objects in Array's prototype chain. We
// expect to be able to trap element sets to objects with those maps in
// the runtime to enable optimization of element hole access.
Handle<HeapObject> heap_object = Handle<HeapObject>::cast(object);
if (heap_object->map()->IsMapInArrayPrototypeChain()) use_ic = false;
}
if (use_ic) {
ASSERT(!object->IsJSGlobalProxy());
if (object->IsJSObject()) {
Handle<JSObject> receiver = Handle<JSObject>::cast(object);
bool key_is_smi_like = key->IsSmi() || !key->ToSmi()->IsFailure();
if (receiver->elements()->map() ==
isolate()->heap()->non_strict_arguments_elements_map()) {
stub = non_strict_arguments_stub();
} else if (key_is_smi_like &&
!(target().is_identical_to(non_strict_arguments_stub()))) {
// We should go generic if receiver isn't a dictionary, but our
// prototype chain does have dictionary elements. This ensures that
// other non-dictionary receivers in the polymorphic case benefit
// from fast path keyed stores.
if (!(receiver->map()->DictionaryElementsInPrototypeChainOnly())) {
KeyedAccessStoreMode store_mode =
GetStoreMode(receiver, key, value);
stub = StoreElementStub(receiver, store_mode);
}
}
}
}
}
if (!is_target_set()) {
if (*stub == *generic_stub()) {
TRACE_GENERIC_IC(isolate(), "KeyedStoreIC", "set generic");
}
ASSERT(!stub.is_null());
set_target(*stub);
TRACE_IC("StoreIC", key);
}
if (maybe_object) return maybe_object;
Handle<Object> result = Runtime::SetObjectProperty(isolate(), object, key,
value,
NONE,
strict_mode());
RETURN_IF_EMPTY_HANDLE(isolate(), result);
return *result;
}
#undef TRACE_IC
// ----------------------------------------------------------------------------
// Static IC stub generators.
//
// Used from ic-<arch>.cc.
RUNTIME_FUNCTION(MaybeObject*, CallIC_Miss) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
CallIC ic(isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<String> key = args.at<String>(1);
ic.UpdateState(receiver, key);
MaybeObject* maybe_result = ic.LoadFunction(receiver, key);
JSFunction* raw_function;
if (!maybe_result->To(&raw_function)) return maybe_result;
// The first time the inline cache is updated may be the first time the
// function it references gets called. If the function is lazily compiled
// then the first call will trigger a compilation. We check for this case
// and we do the compilation immediately, instead of waiting for the stub
// currently attached to the JSFunction object to trigger compilation.
if (raw_function->is_compiled()) return raw_function;
Handle<JSFunction> function(raw_function);
JSFunction::CompileLazy(function, CLEAR_EXCEPTION);
return *function;
}
// Used from ic-<arch>.cc.
RUNTIME_FUNCTION(MaybeObject*, KeyedCallIC_Miss) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
KeyedCallIC ic(isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
ic.UpdateState(receiver, key);
MaybeObject* maybe_result = ic.LoadFunction(receiver, key);
// Result could be a function or a failure.
JSFunction* raw_function = NULL;
if (!maybe_result->To(&raw_function)) return maybe_result;
if (raw_function->is_compiled()) return raw_function;
Handle<JSFunction> function(raw_function, isolate);
JSFunction::CompileLazy(function, CLEAR_EXCEPTION);
return *function;
}
// Used from ic-<arch>.cc.
RUNTIME_FUNCTION(MaybeObject*, LoadIC_Miss) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
LoadIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<String> key = args.at<String>(1);
ic.UpdateState(receiver, key);
return ic.Load(receiver, key);
}
// Used from ic-<arch>.cc
RUNTIME_FUNCTION(MaybeObject*, KeyedLoadIC_Miss) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
KeyedLoadIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
ic.UpdateState(receiver, key);
return ic.Load(receiver, key);
}
RUNTIME_FUNCTION(MaybeObject*, KeyedLoadIC_MissFromStubFailure) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
KeyedLoadIC ic(IC::EXTRA_CALL_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
ic.UpdateState(receiver, key);
return ic.Load(receiver, key);
}
// Used from ic-<arch>.cc.
RUNTIME_FUNCTION(MaybeObject*, StoreIC_Miss) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
StoreIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<String> key = args.at<String>(1);
ic.UpdateState(receiver, key);
return ic.Store(receiver, key, args.at<Object>(2));
}
RUNTIME_FUNCTION(MaybeObject*, StoreIC_MissFromStubFailure) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
StoreIC ic(IC::EXTRA_CALL_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<String> key = args.at<String>(1);
ic.UpdateState(receiver, key);
return ic.Store(receiver, key, args.at<Object>(2));
}
RUNTIME_FUNCTION(MaybeObject*, KeyedCallIC_MissFromStubFailure) {
HandleScope scope(isolate);
ASSERT(args.length() == 2);
KeyedCallIC ic(isolate);
Arguments* caller_args = reinterpret_cast<Arguments*>(args[0]);
Handle<Object> key = args.at<Object>(1);
Handle<Object> receiver((*caller_args)[0], isolate);
ic.UpdateState(receiver, key);
MaybeObject* maybe_result = ic.LoadFunction(receiver, key);
// Result could be a function or a failure.
JSFunction* raw_function = NULL;
if (!maybe_result->To(&raw_function)) return maybe_result;
if (raw_function->is_compiled()) return raw_function;
Handle<JSFunction> function(raw_function, isolate);
JSFunction::CompileLazy(function, CLEAR_EXCEPTION);
return *function;
}
RUNTIME_FUNCTION(MaybeObject*, StoreIC_ArrayLength) {
SealHandleScope shs(isolate);
ASSERT(args.length() == 2);
JSArray* receiver = JSArray::cast(args[0]);
Object* len = args[1];
// The generated code should filter out non-Smis before we get here.
ASSERT(len->IsSmi());
#ifdef DEBUG
// The length property has to be a writable callback property.
LookupResult debug_lookup(isolate);
receiver->LocalLookup(isolate->heap()->length_string(), &debug_lookup);
ASSERT(debug_lookup.IsPropertyCallbacks() && !debug_lookup.IsReadOnly());
#endif
Object* result;
MaybeObject* maybe_result = receiver->SetElementsLength(len);
if (!maybe_result->To(&result)) return maybe_result;
return len;
}
// Extend storage is called in a store inline cache when
// it is necessary to extend the properties array of a
// JSObject.
RUNTIME_FUNCTION(MaybeObject*, SharedStoreIC_ExtendStorage) {
SealHandleScope shs(isolate);
ASSERT(args.length() == 3);
// Convert the parameters
JSObject* object = JSObject::cast(args[0]);
Map* transition = Map::cast(args[1]);
Object* value = args[2];
// Check the object has run out out property space.
ASSERT(object->HasFastProperties());
ASSERT(object->map()->unused_property_fields() == 0);
// Expand the properties array.
FixedArray* old_storage = object->properties();
int new_unused = transition->unused_property_fields();
int new_size = old_storage->length() + new_unused + 1;
Object* result;
MaybeObject* maybe_result = old_storage->CopySize(new_size);
if (!maybe_result->ToObject(&result)) return maybe_result;
FixedArray* new_storage = FixedArray::cast(result);
Object* to_store = value;
if (FLAG_track_double_fields) {
DescriptorArray* descriptors = transition->instance_descriptors();
PropertyDetails details = descriptors->GetDetails(transition->LastAdded());
if (details.representation().IsDouble()) {
MaybeObject* maybe_storage =
isolate->heap()->AllocateHeapNumber(value->Number());
if (!maybe_storage->To(&to_store)) return maybe_storage;
}
}
new_storage->set(old_storage->length(), to_store);
// Set the new property value and do the map transition.
object->set_properties(new_storage);
object->set_map(transition);
// Return the stored value.
return value;
}
// Used from ic-<arch>.cc.
RUNTIME_FUNCTION(MaybeObject*, KeyedStoreIC_Miss) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
KeyedStoreIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
ic.UpdateState(receiver, key);
return ic.Store(receiver, key, args.at<Object>(2));
}
RUNTIME_FUNCTION(MaybeObject*, KeyedStoreIC_MissFromStubFailure) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
KeyedStoreIC ic(IC::EXTRA_CALL_FRAME, isolate);
Handle<Object> receiver = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
ic.UpdateState(receiver, key);
return ic.Store(receiver, key, args.at<Object>(2));
}
RUNTIME_FUNCTION(MaybeObject*, StoreIC_Slow) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
StoreIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> object = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
Handle<Object> value = args.at<Object>(2);
StrictModeFlag strict_mode = ic.strict_mode();
Handle<Object> result = Runtime::SetObjectProperty(isolate, object, key,
value,
NONE,
strict_mode);
RETURN_IF_EMPTY_HANDLE(isolate, result);
return *result;
}
RUNTIME_FUNCTION(MaybeObject*, KeyedStoreIC_Slow) {
HandleScope scope(isolate);
ASSERT(args.length() == 3);
KeyedStoreIC ic(IC::NO_EXTRA_FRAME, isolate);
Handle<Object> object = args.at<Object>(0);
Handle<Object> key = args.at<Object>(1);
Handle<Object> value = args.at<Object>(2);
StrictModeFlag strict_mode = ic.strict_mode();
Handle<Object> result = Runtime::SetObjectProperty(isolate, object, key,
value,
NONE,
strict_mode);
RETURN_IF_EMPTY_HANDLE(isolate, result);
return *result;
}
RUNTIME_FUNCTION(MaybeObject*, ElementsTransitionAndStoreIC_Miss) {
HandleScope scope(isolate);
ASSERT(args.length() == 4);
KeyedStoreIC ic(IC::EXTRA_CALL_FRAME, isolate);
Handle<Object> value = args.at<Object>(0);
Handle<Map> map = args.at<Map>(1);
Handle<Object> key = args.at<Object>(2);
Handle<Object> object = args.at<Object>(3);
StrictModeFlag strict_mode = ic.strict_mode();
if (object->IsJSObject()) {
JSObject::TransitionElementsKind(Handle<JSObject>::cast(object),
map->elements_kind());
}
Handle<Object> result = Runtime::SetObjectProperty(isolate, object, key,
value,
NONE,
strict_mode);
RETURN_IF_EMPTY_HANDLE(isolate, result);
return *result;
}
const char* BinaryOpIC::GetName(TypeInfo type_info) {
switch (type_info) {
case UNINITIALIZED: return "Uninitialized";
case SMI: return "Smi";
case INT32: return "Int32";
case NUMBER: return "Number";
case ODDBALL: return "Oddball";
case STRING: return "String";
case GENERIC: return "Generic";
default: return "Invalid";
}
}
MaybeObject* BinaryOpIC::Transition(Handle<Object> left, Handle<Object> right) {
ExtraICState extra_ic_state = target()->extended_extra_ic_state();
BinaryOpStub stub(extra_ic_state);
Handle<Type> left_type = stub.GetLeftType(isolate());
Handle<Type> right_type = stub.GetRightType(isolate());
bool smi_was_enabled = left_type->Maybe(Type::Smi()) &&
right_type->Maybe(Type::Smi());
Maybe<Handle<Object> > result = stub.Result(left, right, isolate());
if (!result.has_value) return Failure::Exception();
if (FLAG_trace_ic) {
char buffer[100];
NoAllocationStringAllocator allocator(buffer,
static_cast<unsigned>(sizeof(buffer)));
StringStream stream(&allocator);
stream.Add("[");
stub.PrintName(&stream);
stub.UpdateStatus(left, right, result);
stream.Add(" => ");
stub.PrintState(&stream);
stream.Add(" ");
stream.OutputToStdOut();
PrintF(" @ %p <- ", static_cast<void*>(*stub.GetCode(isolate())));
JavaScriptFrame::PrintTop(isolate(), stdout, false, true);
PrintF("]\n");
} else {
stub.UpdateStatus(left, right, result);
}
Handle<Code> code = stub.GetCode(isolate());
set_target(*code);
left_type = stub.GetLeftType(isolate());
right_type = stub.GetRightType(isolate());
bool enable_smi = left_type->Maybe(Type::Smi()) &&
right_type->Maybe(Type::Smi());
if (!smi_was_enabled && enable_smi) {
PatchInlinedSmiCode(address(), ENABLE_INLINED_SMI_CHECK);
} else if (smi_was_enabled && !enable_smi) {
PatchInlinedSmiCode(address(), DISABLE_INLINED_SMI_CHECK);
}
ASSERT(result.has_value);
return static_cast<MaybeObject*>(*result.value);
}
RUNTIME_FUNCTION(MaybeObject*, BinaryOpIC_Miss) {
HandleScope scope(isolate);
Handle<Object> left = args.at<Object>(0);
Handle<Object> right = args.at<Object>(1);
BinaryOpIC ic(isolate);
return ic.Transition(left, right);
}
Code* CompareIC::GetRawUninitialized(Isolate* isolate, Token::Value op) {
ICCompareStub stub(op, UNINITIALIZED, UNINITIALIZED, UNINITIALIZED);
Code* code = NULL;
CHECK(stub.FindCodeInCache(&code, isolate));
return code;
}
Handle<Code> CompareIC::GetUninitialized(Isolate* isolate, Token::Value op) {
ICCompareStub stub(op, UNINITIALIZED, UNINITIALIZED, UNINITIALIZED);
return stub.GetCode(isolate);
}
const char* CompareIC::GetStateName(State state) {
switch (state) {
case UNINITIALIZED: return "UNINITIALIZED";
case SMI: return "SMI";
case NUMBER: return "NUMBER";
case INTERNALIZED_STRING: return "INTERNALIZED_STRING";
case STRING: return "STRING";
case UNIQUE_NAME: return "UNIQUE_NAME";
case OBJECT: return "OBJECT";
case KNOWN_OBJECT: return "KNOWN_OBJECT";
case GENERIC: return "GENERIC";
}
UNREACHABLE();
return NULL;
}
Handle<Type> CompareIC::StateToType(
Isolate* isolate,
CompareIC::State state,
Handle<Map> map) {
switch (state) {
case CompareIC::UNINITIALIZED:
return handle(Type::None(), isolate);
case CompareIC::SMI:
return handle(Type::Smi(), isolate);
case CompareIC::NUMBER:
return handle(Type::Number(), isolate);
case CompareIC::STRING:
return handle(Type::String(), isolate);
case CompareIC::INTERNALIZED_STRING:
return handle(Type::InternalizedString(), isolate);
case CompareIC::UNIQUE_NAME:
return handle(Type::UniqueName(), isolate);
case CompareIC::OBJECT:
return handle(Type::Receiver(), isolate);
case CompareIC::KNOWN_OBJECT:
return handle(
map.is_null() ? Type::Receiver() : Type::Class(map), isolate);
case CompareIC::GENERIC:
return handle(Type::Any(), isolate);
}
UNREACHABLE();
return Handle<Type>();
}
void CompareIC::StubInfoToType(int stub_minor_key,
Handle<Type>* left_type,
Handle<Type>* right_type,
Handle<Type>* overall_type,
Handle<Map> map,
Isolate* isolate) {
State left_state, right_state, handler_state;
<