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runtime-typedarray.cc
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runtime-typedarray.cc
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// Copyright 2014 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/runtime/runtime-utils.h"
#include "src/arguments.h"
#include "src/elements.h"
#include "src/factory.h"
#include "src/messages.h"
#include "src/objects-inl.h"
#include "src/runtime/runtime.h"
namespace v8 {
namespace internal {
RUNTIME_FUNCTION(Runtime_ArrayBufferGetByteLength) {
SealHandleScope shs(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_CHECKED(JSArrayBuffer, holder, 0);
return holder->byte_length();
}
RUNTIME_FUNCTION(Runtime_ArrayBufferNeuter) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSArrayBuffer, array_buffer, 0);
if (array_buffer->backing_store() == NULL) {
CHECK(Smi::kZero == array_buffer->byte_length());
return isolate->heap()->undefined_value();
}
// Shared array buffers should never be neutered.
CHECK(!array_buffer->is_shared());
DCHECK(!array_buffer->is_external());
void* backing_store = array_buffer->backing_store();
size_t byte_length = NumberToSize(array_buffer->byte_length());
array_buffer->set_is_external(true);
isolate->heap()->UnregisterArrayBuffer(*array_buffer);
array_buffer->Neuter();
isolate->array_buffer_allocator()->Free(backing_store, byte_length);
return isolate->heap()->undefined_value();
}
#define BUFFER_VIEW_GETTER(Type, getter, accessor) \
RUNTIME_FUNCTION(Runtime_##Type##Get##getter) { \
HandleScope scope(isolate); \
DCHECK_EQ(1, args.length()); \
CONVERT_ARG_HANDLE_CHECKED(JS##Type, holder, 0); \
return holder->accessor(); \
}
BUFFER_VIEW_GETTER(ArrayBufferView, ByteLength, byte_length)
BUFFER_VIEW_GETTER(ArrayBufferView, ByteOffset, byte_offset)
BUFFER_VIEW_GETTER(TypedArray, Length, length)
#undef BUFFER_VIEW_GETTER
RUNTIME_FUNCTION(Runtime_TypedArrayGetBuffer) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, holder, 0);
return *holder->GetBuffer();
}
// Return codes for Runtime_TypedArraySetFastCases.
// Should be synchronized with typedarray.js natives.
enum TypedArraySetResultCodes {
// Set from typed array of the same type.
// This is processed by TypedArraySetFastCases
TYPED_ARRAY_SET_TYPED_ARRAY_SAME_TYPE = 0,
// Set from typed array of the different type, overlapping in memory.
TYPED_ARRAY_SET_TYPED_ARRAY_OVERLAPPING = 1,
// Set from typed array of the different type, non-overlapping.
TYPED_ARRAY_SET_TYPED_ARRAY_NONOVERLAPPING = 2,
// Set from non-typed array.
TYPED_ARRAY_SET_NON_TYPED_ARRAY = 3
};
RUNTIME_FUNCTION(Runtime_TypedArraySetFastCases) {
HandleScope scope(isolate);
DCHECK_EQ(3, args.length());
if (!args[0]->IsJSTypedArray()) {
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewTypeError(MessageTemplate::kNotTypedArray));
}
if (!args[1]->IsJSTypedArray())
return Smi::FromInt(TYPED_ARRAY_SET_NON_TYPED_ARRAY);
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, target_obj, 0);
CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, source_obj, 1);
CONVERT_NUMBER_ARG_HANDLE_CHECKED(offset_obj, 2);
Handle<JSTypedArray> target(JSTypedArray::cast(*target_obj));
Handle<JSTypedArray> source(JSTypedArray::cast(*source_obj));
size_t offset = 0;
CHECK(TryNumberToSize(*offset_obj, &offset));
size_t target_length = target->length_value();
size_t source_length = source->length_value();
size_t target_byte_length = NumberToSize(target->byte_length());
size_t source_byte_length = NumberToSize(source->byte_length());
if (offset > target_length || offset + source_length > target_length ||
offset + source_length < offset) { // overflow
THROW_NEW_ERROR_RETURN_FAILURE(
isolate, NewRangeError(MessageTemplate::kTypedArraySetSourceTooLarge));
}
size_t target_offset = NumberToSize(target->byte_offset());
size_t source_offset = NumberToSize(source->byte_offset());
uint8_t* target_base =
static_cast<uint8_t*>(target->GetBuffer()->backing_store()) +
target_offset;
uint8_t* source_base =
static_cast<uint8_t*>(source->GetBuffer()->backing_store()) +
source_offset;
// Typed arrays of the same type: use memmove.
if (target->type() == source->type()) {
memmove(target_base + offset * target->element_size(), source_base,
source_byte_length);
return Smi::FromInt(TYPED_ARRAY_SET_TYPED_ARRAY_SAME_TYPE);
}
// Typed arrays of different types over the same backing store
if ((source_base <= target_base &&
source_base + source_byte_length > target_base) ||
(target_base <= source_base &&
target_base + target_byte_length > source_base)) {
// We do not support overlapping ArrayBuffers
DCHECK(target->GetBuffer()->backing_store() ==
source->GetBuffer()->backing_store());
return Smi::FromInt(TYPED_ARRAY_SET_TYPED_ARRAY_OVERLAPPING);
} else { // Non-overlapping typed arrays
return Smi::FromInt(TYPED_ARRAY_SET_TYPED_ARRAY_NONOVERLAPPING);
}
}
namespace {
template <typename T>
bool CompareNum(T x, T y) {
if (x < y) {
return true;
} else if (x > y) {
return false;
} else if (!std::is_integral<T>::value) {
double _x = x, _y = y;
if (x == 0 && x == y) {
/* -0.0 is less than +0.0 */
return std::signbit(_x) && !std::signbit(_y);
} else if (!std::isnan(_x) && std::isnan(_y)) {
/* number is less than NaN */
return true;
}
}
return false;
}
} // namespace
RUNTIME_FUNCTION(Runtime_TypedArraySortFast) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
CONVERT_ARG_HANDLE_CHECKED(Object, target_obj, 0);
Handle<JSTypedArray> array;
const char* method = "%TypedArray%.prototype.sort";
ASSIGN_RETURN_FAILURE_ON_EXCEPTION(
isolate, array, JSTypedArray::Validate(isolate, target_obj, method));
// This line can be removed when JSTypedArray::Validate throws
// if array.[[ViewedArrayBuffer]] is neutered(v8:4648)
if (V8_UNLIKELY(array->WasNeutered())) return *array;
size_t length = array->length_value();
if (length <= 1) return *array;
Handle<FixedTypedArrayBase> elements(
FixedTypedArrayBase::cast(array->elements()));
switch (array->type()) {
#define TYPED_ARRAY_SORT(Type, type, TYPE, ctype, size) \
case kExternal##Type##Array: { \
ctype* data = static_cast<ctype*>(elements->DataPtr()); \
if (kExternal##Type##Array == kExternalFloat64Array || \
kExternal##Type##Array == kExternalFloat32Array) \
std::sort(data, data + length, CompareNum<ctype>); \
else \
std::sort(data, data + length); \
break; \
}
TYPED_ARRAYS(TYPED_ARRAY_SORT)
#undef TYPED_ARRAY_SORT
}
return *array;
}
RUNTIME_FUNCTION(Runtime_TypedArrayMaxSizeInHeap) {
DCHECK_EQ(0, args.length());
DCHECK_OBJECT_SIZE(FLAG_typed_array_max_size_in_heap +
FixedTypedArrayBase::kDataOffset);
return Smi::FromInt(FLAG_typed_array_max_size_in_heap);
}
RUNTIME_FUNCTION(Runtime_IsTypedArray) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
return isolate->heap()->ToBoolean(args[0]->IsJSTypedArray());
}
RUNTIME_FUNCTION(Runtime_IsSharedTypedArray) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
return isolate->heap()->ToBoolean(
args[0]->IsJSTypedArray() &&
JSTypedArray::cast(args[0])->GetBuffer()->is_shared());
}
RUNTIME_FUNCTION(Runtime_IsSharedIntegerTypedArray) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
if (!args[0]->IsJSTypedArray()) {
return isolate->heap()->false_value();
}
Handle<JSTypedArray> obj(JSTypedArray::cast(args[0]));
return isolate->heap()->ToBoolean(obj->GetBuffer()->is_shared() &&
obj->type() != kExternalFloat32Array &&
obj->type() != kExternalFloat64Array &&
obj->type() != kExternalUint8ClampedArray);
}
RUNTIME_FUNCTION(Runtime_IsSharedInteger32TypedArray) {
HandleScope scope(isolate);
DCHECK_EQ(1, args.length());
if (!args[0]->IsJSTypedArray()) {
return isolate->heap()->false_value();
}
Handle<JSTypedArray> obj(JSTypedArray::cast(args[0]));
return isolate->heap()->ToBoolean(obj->GetBuffer()->is_shared() &&
obj->type() == kExternalInt32Array);
}
} // namespace internal
} // namespace v8