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// Copyright 2016 the V8 project authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "src/builtins/builtins-utils.h"
#include "src/builtins/builtins.h"
#include "src/code-stub-assembler.h"
#include "src/counters.h"
#include "src/objects-inl.h"
namespace v8 {
namespace internal {
class TypedArrayBuiltinsAssembler : public CodeStubAssembler {
public:
explicit TypedArrayBuiltinsAssembler(compiler::CodeAssemblerState* state)
: CodeStubAssembler(state) {}
protected:
void GenerateTypedArrayPrototypeGetter(const char* method_name,
int object_offset);
template <IterationKind kIterationKind>
void GenerateTypedArrayPrototypeIterationMethod(const char* method_name);
};
// -----------------------------------------------------------------------------
// ES6 section 22.2 TypedArray Objects
// ES6 section 22.2.3.1 get %TypedArray%.prototype.buffer
BUILTIN(TypedArrayPrototypeBuffer) {
HandleScope scope(isolate);
CHECK_RECEIVER(JSTypedArray, typed_array, "get TypedArray.prototype.buffer");
return *typed_array->GetBuffer();
}
void TypedArrayBuiltinsAssembler::GenerateTypedArrayPrototypeGetter(
const char* method_name, int object_offset) {
Node* receiver = Parameter(0);
Node* context = Parameter(3);
// Check if the {receiver} is actually a JSTypedArray.
Label receiver_is_incompatible(this, Label::kDeferred);
GotoIf(TaggedIsSmi(receiver), &receiver_is_incompatible);
GotoIfNot(HasInstanceType(receiver, JS_TYPED_ARRAY_TYPE),
&receiver_is_incompatible);
// Check if the {receiver}'s JSArrayBuffer was neutered.
Node* receiver_buffer =
LoadObjectField(receiver, JSTypedArray::kBufferOffset);
Label if_receiverisneutered(this, Label::kDeferred);
GotoIf(IsDetachedBuffer(receiver_buffer), &if_receiverisneutered);
Return(LoadObjectField(receiver, object_offset));
Bind(&if_receiverisneutered);
{
// The {receiver}s buffer was neutered, default to zero.
Return(SmiConstant(0));
}
Bind(&receiver_is_incompatible);
{
// The {receiver} is not a valid JSTypedArray.
CallRuntime(Runtime::kThrowIncompatibleMethodReceiver, context,
HeapConstant(
factory()->NewStringFromAsciiChecked(method_name, TENURED)),
receiver);
Unreachable();
}
}
// ES6 section 22.2.3.2 get %TypedArray%.prototype.byteLength
TF_BUILTIN(TypedArrayPrototypeByteLength, TypedArrayBuiltinsAssembler) {
GenerateTypedArrayPrototypeGetter("get TypedArray.prototype.byteLength",
JSTypedArray::kByteLengthOffset);
}
// ES6 section 22.2.3.3 get %TypedArray%.prototype.byteOffset
TF_BUILTIN(TypedArrayPrototypeByteOffset, TypedArrayBuiltinsAssembler) {
GenerateTypedArrayPrototypeGetter("get TypedArray.prototype.byteOffset",
JSTypedArray::kByteOffsetOffset);
}
// ES6 section 22.2.3.18 get %TypedArray%.prototype.length
TF_BUILTIN(TypedArrayPrototypeLength, TypedArrayBuiltinsAssembler) {
GenerateTypedArrayPrototypeGetter("get TypedArray.prototype.length",
JSTypedArray::kLengthOffset);
}
template <IterationKind kIterationKind>
void TypedArrayBuiltinsAssembler::GenerateTypedArrayPrototypeIterationMethod(
const char* method_name) {
Node* receiver = Parameter(0);
Node* context = Parameter(3);
Label throw_bad_receiver(this, Label::kDeferred);
Label throw_typeerror(this, Label::kDeferred);
GotoIf(TaggedIsSmi(receiver), &throw_bad_receiver);
Node* map = LoadMap(receiver);
Node* instance_type = LoadMapInstanceType(map);
GotoIf(Word32NotEqual(instance_type, Int32Constant(JS_TYPED_ARRAY_TYPE)),
&throw_bad_receiver);
// Check if the {receiver}'s JSArrayBuffer was neutered.
Node* receiver_buffer =
LoadObjectField(receiver, JSTypedArray::kBufferOffset);
Label if_receiverisneutered(this, Label::kDeferred);
GotoIf(IsDetachedBuffer(receiver_buffer), &if_receiverisneutered);
Return(CreateArrayIterator(receiver, map, instance_type, context,
kIterationKind));
Variable var_message(this, MachineRepresentation::kTagged);
Bind(&throw_bad_receiver);
var_message.Bind(SmiConstant(MessageTemplate::kNotTypedArray));
Goto(&throw_typeerror);
Bind(&if_receiverisneutered);
var_message.Bind(
SmiConstant(Smi::FromInt(MessageTemplate::kDetachedOperation)));
Goto(&throw_typeerror);
Bind(&throw_typeerror);
{
Node* method_arg = HeapConstant(
isolate()->factory()->NewStringFromAsciiChecked(method_name, TENURED));
Node* result = CallRuntime(Runtime::kThrowTypeError, context,
var_message.value(), method_arg);
Return(result);
}
}
TF_BUILTIN(TypedArrayPrototypeValues, TypedArrayBuiltinsAssembler) {
GenerateTypedArrayPrototypeIterationMethod<IterationKind::kValues>(
"%TypedArray%.prototype.values()");
}
TF_BUILTIN(TypedArrayPrototypeEntries, TypedArrayBuiltinsAssembler) {
GenerateTypedArrayPrototypeIterationMethod<IterationKind::kEntries>(
"%TypedArray%.prototype.entries()");
}
TF_BUILTIN(TypedArrayPrototypeKeys, TypedArrayBuiltinsAssembler) {
GenerateTypedArrayPrototypeIterationMethod<IterationKind::kKeys>(
"%TypedArray%.prototype.keys()");
}
namespace {
int64_t CapRelativeIndex(Handle<Object> num, int64_t minimum, int64_t maximum) {
int64_t relative;
if (V8_LIKELY(num->IsSmi())) {
relative = Smi::cast(*num)->value();
} else {
DCHECK(num->IsHeapNumber());
double fp = HeapNumber::cast(*num)->value();
if (V8_UNLIKELY(!std::isfinite(fp))) {
// +Infinity / -Infinity
DCHECK(!std::isnan(fp));
return fp < 0 ? minimum : maximum;
}
relative = static_cast<int64_t>(fp);
}
return relative < 0 ? std::max<int64_t>(relative + maximum, minimum)
: std::min<int64_t>(relative, maximum);
}
} // namespace
BUILTIN(TypedArrayPrototypeCopyWithin) {
HandleScope scope(isolate);
Handle<JSTypedArray> array;
const char* method = "%TypedArray%.prototype.copyWithin";
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, array, JSTypedArray::Validate(isolate, args.receiver(), method));
if (V8_UNLIKELY(array->WasNeutered())) return *array;
int64_t len = array->length_value();
int64_t to = 0;
int64_t from = 0;
int64_t final = len;
if (V8_LIKELY(args.length() > 1)) {
Handle<Object> num;
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, num, Object::ToInteger(isolate, args.at<Object>(1)));
to = CapRelativeIndex(num, 0, len);
if (args.length() > 2) {
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, num, Object::ToInteger(isolate, args.at<Object>(2)));
from = CapRelativeIndex(num, 0, len);
Handle<Object> end = args.atOrUndefined(isolate, 3);
if (!end->IsUndefined(isolate)) {
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(isolate, num,
Object::ToInteger(isolate, end));
final = CapRelativeIndex(num, 0, len);
}
}
}
int64_t count = std::min<int64_t>(final - from, len - to);
if (count <= 0) return *array;
// TypedArray buffer may have been transferred/detached during parameter
// processing above. Return early in this case, to prevent potential UAF error
// TODO(caitp): throw here, as though the full algorithm were performed (the
// throw would have come from ecma262/#sec-integerindexedelementget)
// (see )
if (V8_UNLIKELY(array->WasNeutered())) return *array;
// Ensure processed indexes are within array bounds
DCHECK_GE(from, 0);
DCHECK_LT(from, len);
DCHECK_GE(to, 0);
DCHECK_LT(to, len);
DCHECK_GE(len - count, 0);
Handle<FixedTypedArrayBase> elements(
FixedTypedArrayBase::cast(array->elements()));
size_t element_size = array->element_size();
to = to * element_size;
from = from * element_size;
count = count * element_size;
uint8_t* data = static_cast<uint8_t*>(elements->DataPtr());
std::memmove(data + to, data + from, count);
return *array;
}
} // namespace internal
} // namespace v8
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