| // 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/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(args.length() == 1); |
| CONVERT_ARG_CHECKED(JSArrayBuffer, holder, 0); |
| return holder->byte_length(); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_ArrayBufferSliceImpl) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 4); |
| CONVERT_ARG_HANDLE_CHECKED(JSArrayBuffer, source, 0); |
| CONVERT_ARG_HANDLE_CHECKED(JSArrayBuffer, target, 1); |
| CONVERT_NUMBER_ARG_HANDLE_CHECKED(first, 2); |
| CONVERT_NUMBER_ARG_HANDLE_CHECKED(new_length, 3); |
| RUNTIME_ASSERT(!source.is_identical_to(target)); |
| size_t start = 0, target_length = 0; |
| RUNTIME_ASSERT(TryNumberToSize(isolate, *first, &start)); |
| RUNTIME_ASSERT(TryNumberToSize(isolate, *new_length, &target_length)); |
| RUNTIME_ASSERT(NumberToSize(isolate, target->byte_length()) >= target_length); |
| |
| if (target_length == 0) return isolate->heap()->undefined_value(); |
| |
| size_t source_byte_length = NumberToSize(isolate, source->byte_length()); |
| RUNTIME_ASSERT(start <= source_byte_length); |
| RUNTIME_ASSERT(source_byte_length - start >= target_length); |
| uint8_t* source_data = reinterpret_cast<uint8_t*>(source->backing_store()); |
| uint8_t* target_data = reinterpret_cast<uint8_t*>(target->backing_store()); |
| CopyBytes(target_data, source_data + start, target_length); |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_ArrayBufferNeuter) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| CONVERT_ARG_HANDLE_CHECKED(JSArrayBuffer, array_buffer, 0); |
| if (array_buffer->backing_store() == NULL) { |
| CHECK(Smi::FromInt(0) == array_buffer->byte_length()); |
| return isolate->heap()->undefined_value(); |
| } |
| // Shared array buffers should never be neutered. |
| RUNTIME_ASSERT(!array_buffer->is_shared()); |
| DCHECK(!array_buffer->is_external()); |
| void* backing_store = array_buffer->backing_store(); |
| size_t byte_length = NumberToSize(isolate, 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(); |
| } |
| |
| |
| void Runtime::ArrayIdToTypeAndSize(int arrayId, ExternalArrayType* array_type, |
| ElementsKind* fixed_elements_kind, |
| size_t* element_size) { |
| switch (arrayId) { |
| #define ARRAY_ID_CASE(Type, type, TYPE, ctype, size) \ |
| case ARRAY_ID_##TYPE: \ |
| *array_type = kExternal##Type##Array; \ |
| *fixed_elements_kind = TYPE##_ELEMENTS; \ |
| *element_size = size; \ |
| break; |
| |
| TYPED_ARRAYS(ARRAY_ID_CASE) |
| #undef ARRAY_ID_CASE |
| |
| default: |
| UNREACHABLE(); |
| } |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_TypedArrayInitialize) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 6); |
| CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, holder, 0); |
| CONVERT_SMI_ARG_CHECKED(arrayId, 1); |
| CONVERT_ARG_HANDLE_CHECKED(Object, maybe_buffer, 2); |
| CONVERT_NUMBER_ARG_HANDLE_CHECKED(byte_offset_object, 3); |
| CONVERT_NUMBER_ARG_HANDLE_CHECKED(byte_length_object, 4); |
| CONVERT_BOOLEAN_ARG_CHECKED(initialize, 5); |
| |
| RUNTIME_ASSERT(arrayId >= Runtime::ARRAY_ID_FIRST && |
| arrayId <= Runtime::ARRAY_ID_LAST); |
| |
| ExternalArrayType array_type = kExternalInt8Array; // Bogus initialization. |
| size_t element_size = 1; // Bogus initialization. |
| ElementsKind fixed_elements_kind = INT8_ELEMENTS; // Bogus initialization. |
| Runtime::ArrayIdToTypeAndSize(arrayId, &array_type, &fixed_elements_kind, |
| &element_size); |
| RUNTIME_ASSERT(holder->map()->elements_kind() == fixed_elements_kind); |
| |
| size_t byte_offset = 0; |
| size_t byte_length = 0; |
| RUNTIME_ASSERT(TryNumberToSize(isolate, *byte_offset_object, &byte_offset)); |
| RUNTIME_ASSERT(TryNumberToSize(isolate, *byte_length_object, &byte_length)); |
| |
| if (maybe_buffer->IsJSArrayBuffer()) { |
| Handle<JSArrayBuffer> buffer = Handle<JSArrayBuffer>::cast(maybe_buffer); |
| size_t array_buffer_byte_length = |
| NumberToSize(isolate, buffer->byte_length()); |
| RUNTIME_ASSERT(byte_offset <= array_buffer_byte_length); |
| RUNTIME_ASSERT(array_buffer_byte_length - byte_offset >= byte_length); |
| } else { |
| RUNTIME_ASSERT(maybe_buffer->IsNull()); |
| } |
| |
| RUNTIME_ASSERT(byte_length % element_size == 0); |
| size_t length = byte_length / element_size; |
| |
| if (length > static_cast<unsigned>(Smi::kMaxValue)) { |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewRangeError(MessageTemplate::kInvalidTypedArrayLength)); |
| } |
| |
| // All checks are done, now we can modify objects. |
| |
| DCHECK_EQ(v8::ArrayBufferView::kInternalFieldCount, |
| holder->GetInternalFieldCount()); |
| for (int i = 0; i < v8::ArrayBufferView::kInternalFieldCount; i++) { |
| holder->SetInternalField(i, Smi::FromInt(0)); |
| } |
| Handle<Object> length_obj = isolate->factory()->NewNumberFromSize(length); |
| holder->set_length(*length_obj); |
| holder->set_byte_offset(*byte_offset_object); |
| holder->set_byte_length(*byte_length_object); |
| |
| if (!maybe_buffer->IsNull()) { |
| Handle<JSArrayBuffer> buffer = Handle<JSArrayBuffer>::cast(maybe_buffer); |
| holder->set_buffer(*buffer); |
| |
| Handle<FixedTypedArrayBase> elements = |
| isolate->factory()->NewFixedTypedArrayWithExternalPointer( |
| static_cast<int>(length), array_type, |
| static_cast<uint8_t*>(buffer->backing_store()) + byte_offset); |
| holder->set_elements(*elements); |
| } else { |
| Handle<JSArrayBuffer> buffer = isolate->factory()->NewJSArrayBuffer(); |
| JSArrayBuffer::Setup(buffer, isolate, true, NULL, byte_length, |
| SharedFlag::kNotShared); |
| holder->set_buffer(*buffer); |
| Handle<FixedTypedArrayBase> elements = |
| isolate->factory()->NewFixedTypedArray(static_cast<int>(length), |
| array_type, initialize); |
| holder->set_elements(*elements); |
| } |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| // Initializes a typed array from an array-like object. |
| // If an array-like object happens to be a typed array of the same type, |
| // initializes backing store using memove. |
| // |
| // Returns true if backing store was initialized or false otherwise. |
| RUNTIME_FUNCTION(Runtime_TypedArrayInitializeFromArrayLike) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 4); |
| CONVERT_ARG_HANDLE_CHECKED(JSTypedArray, holder, 0); |
| CONVERT_SMI_ARG_CHECKED(arrayId, 1); |
| CONVERT_ARG_HANDLE_CHECKED(Object, source, 2); |
| CONVERT_NUMBER_ARG_HANDLE_CHECKED(length_obj, 3); |
| |
| RUNTIME_ASSERT(arrayId >= Runtime::ARRAY_ID_FIRST && |
| arrayId <= Runtime::ARRAY_ID_LAST); |
| |
| ExternalArrayType array_type = kExternalInt8Array; // Bogus initialization. |
| size_t element_size = 1; // Bogus initialization. |
| ElementsKind fixed_elements_kind = INT8_ELEMENTS; // Bogus initialization. |
| Runtime::ArrayIdToTypeAndSize(arrayId, &array_type, &fixed_elements_kind, |
| &element_size); |
| |
| RUNTIME_ASSERT(holder->map()->elements_kind() == fixed_elements_kind); |
| |
| Handle<JSArrayBuffer> buffer = isolate->factory()->NewJSArrayBuffer(); |
| size_t length = 0; |
| if (source->IsJSTypedArray() && |
| JSTypedArray::cast(*source)->type() == array_type) { |
| length_obj = handle(JSTypedArray::cast(*source)->length(), isolate); |
| length = JSTypedArray::cast(*source)->length_value(); |
| } else { |
| RUNTIME_ASSERT(TryNumberToSize(isolate, *length_obj, &length)); |
| } |
| |
| if ((length > static_cast<unsigned>(Smi::kMaxValue)) || |
| (length > (kMaxInt / element_size))) { |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewRangeError(MessageTemplate::kInvalidTypedArrayLength)); |
| } |
| size_t byte_length = length * element_size; |
| |
| DCHECK_EQ(v8::ArrayBufferView::kInternalFieldCount, |
| holder->GetInternalFieldCount()); |
| for (int i = 0; i < v8::ArrayBufferView::kInternalFieldCount; i++) { |
| holder->SetInternalField(i, Smi::FromInt(0)); |
| } |
| |
| // NOTE: not initializing backing store. |
| // We assume that the caller of this function will initialize holder |
| // with the loop |
| // for(i = 0; i < length; i++) { holder[i] = source[i]; } |
| // We assume that the caller of this function is always a typed array |
| // constructor. |
| // If source is a typed array, this loop will always run to completion, |
| // so we are sure that the backing store will be initialized. |
| // Otherwise, the indexing operation might throw, so the loop will not |
| // run to completion and the typed array might remain partly initialized. |
| // However we further assume that the caller of this function is a typed array |
| // constructor, and the exception will propagate out of the constructor, |
| // therefore uninitialized memory will not be accessible by a user program. |
| // |
| // TODO(dslomov): revise this once we support subclassing. |
| |
| if (!JSArrayBuffer::SetupAllocatingData(buffer, isolate, byte_length, |
| false)) { |
| THROW_NEW_ERROR_RETURN_FAILURE( |
| isolate, NewRangeError(MessageTemplate::kInvalidArrayBufferLength)); |
| } |
| |
| holder->set_buffer(*buffer); |
| holder->set_byte_offset(Smi::FromInt(0)); |
| Handle<Object> byte_length_obj( |
| isolate->factory()->NewNumberFromSize(byte_length)); |
| holder->set_byte_length(*byte_length_obj); |
| holder->set_length(*length_obj); |
| |
| Handle<FixedTypedArrayBase> elements = |
| isolate->factory()->NewFixedTypedArrayWithExternalPointer( |
| static_cast<int>(length), array_type, |
| static_cast<uint8_t*>(buffer->backing_store())); |
| holder->set_elements(*elements); |
| |
| if (source->IsJSTypedArray()) { |
| Handle<JSTypedArray> typed_array(JSTypedArray::cast(*source)); |
| |
| if (typed_array->type() == holder->type()) { |
| uint8_t* backing_store = |
| static_cast<uint8_t*>(typed_array->GetBuffer()->backing_store()); |
| size_t source_byte_offset = |
| NumberToSize(isolate, typed_array->byte_offset()); |
| memcpy(buffer->backing_store(), backing_store + source_byte_offset, |
| byte_length); |
| return isolate->heap()->true_value(); |
| } |
| } |
| |
| return isolate->heap()->false_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) |
| BUFFER_VIEW_GETTER(DataView, Buffer, buffer) |
| |
| #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(args.length() == 3); |
| 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; |
| RUNTIME_ASSERT(TryNumberToSize(isolate, *offset_obj, &offset)); |
| size_t target_length = target->length_value(); |
| size_t source_length = source->length_value(); |
| size_t target_byte_length = NumberToSize(isolate, target->byte_length()); |
| size_t source_byte_length = NumberToSize(isolate, 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(isolate, target->byte_offset()); |
| size_t source_offset = NumberToSize(isolate, 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); |
| } |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_TypedArrayMaxSizeInHeap) { |
| DCHECK(args.length() == 0); |
| 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(args.length() == 1); |
| return isolate->heap()->ToBoolean(args[0]->IsJSTypedArray()); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_IsSharedTypedArray) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| return isolate->heap()->ToBoolean( |
| args[0]->IsJSTypedArray() && |
| JSTypedArray::cast(args[0])->GetBuffer()->is_shared()); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_IsSharedIntegerTypedArray) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| 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); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_IsSharedInteger32TypedArray) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 1); |
| 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); |
| } |
| |
| |
| RUNTIME_FUNCTION(Runtime_DataViewInitialize) { |
| HandleScope scope(isolate); |
| DCHECK(args.length() == 4); |
| CONVERT_ARG_HANDLE_CHECKED(JSDataView, holder, 0); |
| CONVERT_ARG_HANDLE_CHECKED(JSArrayBuffer, buffer, 1); |
| CONVERT_NUMBER_ARG_HANDLE_CHECKED(byte_offset, 2); |
| CONVERT_NUMBER_ARG_HANDLE_CHECKED(byte_length, 3); |
| |
| DCHECK_EQ(v8::ArrayBufferView::kInternalFieldCount, |
| holder->GetInternalFieldCount()); |
| for (int i = 0; i < v8::ArrayBufferView::kInternalFieldCount; i++) { |
| holder->SetInternalField(i, Smi::FromInt(0)); |
| } |
| size_t buffer_length = 0; |
| size_t offset = 0; |
| size_t length = 0; |
| RUNTIME_ASSERT( |
| TryNumberToSize(isolate, buffer->byte_length(), &buffer_length)); |
| RUNTIME_ASSERT(TryNumberToSize(isolate, *byte_offset, &offset)); |
| RUNTIME_ASSERT(TryNumberToSize(isolate, *byte_length, &length)); |
| |
| // TODO(jkummerow): When we have a "safe numerics" helper class, use it here. |
| // Entire range [offset, offset + length] must be in bounds. |
| RUNTIME_ASSERT(offset <= buffer_length); |
| RUNTIME_ASSERT(offset + length <= buffer_length); |
| // No overflow. |
| RUNTIME_ASSERT(offset + length >= offset); |
| |
| holder->set_buffer(*buffer); |
| holder->set_byte_offset(*byte_offset); |
| holder->set_byte_length(*byte_length); |
| |
| return isolate->heap()->undefined_value(); |
| } |
| |
| |
| inline static bool NeedToFlipBytes(bool is_little_endian) { |
| #ifdef V8_TARGET_LITTLE_ENDIAN |
| return !is_little_endian; |
| #else |
| return is_little_endian; |
| #endif |
| } |
| |
| |
| template <int n> |
| inline void CopyBytes(uint8_t* target, uint8_t* source) { |
| for (int i = 0; i < n; i++) { |
| *(target++) = *(source++); |
| } |
| } |
| |
| |
| template <int n> |
| inline void FlipBytes(uint8_t* target, uint8_t* source) { |
| source = source + (n - 1); |
| for (int i = 0; i < n; i++) { |
| *(target++) = *(source--); |
| } |
| } |
| |
| |
| template <typename T> |
| inline static bool DataViewGetValue(Isolate* isolate, |
| Handle<JSDataView> data_view, |
| Handle<Object> byte_offset_obj, |
| bool is_little_endian, T* result) { |
| size_t byte_offset = 0; |
| if (!TryNumberToSize(isolate, *byte_offset_obj, &byte_offset)) { |
| return false; |
| } |
| Handle<JSArrayBuffer> buffer(JSArrayBuffer::cast(data_view->buffer())); |
| |
| size_t data_view_byte_offset = |
| NumberToSize(isolate, data_view->byte_offset()); |
| size_t data_view_byte_length = |
| NumberToSize(isolate, data_view->byte_length()); |
| if (byte_offset + sizeof(T) > data_view_byte_length || |
| byte_offset + sizeof(T) < byte_offset) { // overflow |
| return false; |
| } |
| |
| union Value { |
| T data; |
| uint8_t bytes[sizeof(T)]; |
| }; |
| |
| Value value; |
| size_t buffer_offset = data_view_byte_offset + byte_offset; |
| DCHECK(NumberToSize(isolate, buffer->byte_length()) >= |
| buffer_offset + sizeof(T)); |
| uint8_t* source = |
| static_cast<uint8_t*>(buffer->backing_store()) + buffer_offset; |
| if (NeedToFlipBytes(is_little_endian)) { |
| FlipBytes<sizeof(T)>(value.bytes, source); |
| } else { |
| CopyBytes<sizeof(T)>(value.bytes, source); |
| } |
| *result = value.data; |
| return true; |
| } |
| |
| |
| template <typename T> |
| static bool DataViewSetValue(Isolate* isolate, Handle<JSDataView> data_view, |
| Handle<Object> byte_offset_obj, |
| bool is_little_endian, T data) { |
| size_t byte_offset = 0; |
| if (!TryNumberToSize(isolate, *byte_offset_obj, &byte_offset)) { |
| return false; |
| } |
| Handle<JSArrayBuffer> buffer(JSArrayBuffer::cast(data_view->buffer())); |
| |
| size_t data_view_byte_offset = |
| NumberToSize(isolate, data_view->byte_offset()); |
| size_t data_view_byte_length = |
| NumberToSize(isolate, data_view->byte_length()); |
| if (byte_offset + sizeof(T) > data_view_byte_length || |
| byte_offset + sizeof(T) < byte_offset) { // overflow |
| return false; |
| } |
| |
| union Value { |
| T data; |
| uint8_t bytes[sizeof(T)]; |
| }; |
| |
| Value value; |
| value.data = data; |
| size_t buffer_offset = data_view_byte_offset + byte_offset; |
| DCHECK(NumberToSize(isolate, buffer->byte_length()) >= |
| buffer_offset + sizeof(T)); |
| uint8_t* target = |
| static_cast<uint8_t*>(buffer->backing_store()) + buffer_offset; |
| if (NeedToFlipBytes(is_little_endian)) { |
| FlipBytes<sizeof(T)>(target, value.bytes); |
| } else { |
| CopyBytes<sizeof(T)>(target, value.bytes); |
| } |
| return true; |
| } |
| |
| |
| #define DATA_VIEW_GETTER(TypeName, Type, Converter) \ |
| RUNTIME_FUNCTION(Runtime_DataViewGet##TypeName) { \ |
| HandleScope scope(isolate); \ |
| DCHECK(args.length() == 3); \ |
| CONVERT_ARG_HANDLE_CHECKED(JSDataView, holder, 0); \ |
| CONVERT_NUMBER_ARG_HANDLE_CHECKED(offset, 1); \ |
| CONVERT_BOOLEAN_ARG_CHECKED(is_little_endian, 2); \ |
| Type result; \ |
| if (DataViewGetValue(isolate, holder, offset, is_little_endian, \ |
| &result)) { \ |
| return *isolate->factory()->Converter(result); \ |
| } else { \ |
| THROW_NEW_ERROR_RETURN_FAILURE( \ |
| isolate, \ |
| NewRangeError(MessageTemplate::kInvalidDataViewAccessorOffset)); \ |
| } \ |
| } |
| |
| DATA_VIEW_GETTER(Uint8, uint8_t, NewNumberFromUint) |
| DATA_VIEW_GETTER(Int8, int8_t, NewNumberFromInt) |
| DATA_VIEW_GETTER(Uint16, uint16_t, NewNumberFromUint) |
| DATA_VIEW_GETTER(Int16, int16_t, NewNumberFromInt) |
| DATA_VIEW_GETTER(Uint32, uint32_t, NewNumberFromUint) |
| DATA_VIEW_GETTER(Int32, int32_t, NewNumberFromInt) |
| DATA_VIEW_GETTER(Float32, float, NewNumber) |
| DATA_VIEW_GETTER(Float64, double, NewNumber) |
| |
| #undef DATA_VIEW_GETTER |
| |
| |
| template <typename T> |
| static T DataViewConvertValue(double value); |
| |
| |
| template <> |
| int8_t DataViewConvertValue<int8_t>(double value) { |
| return static_cast<int8_t>(DoubleToInt32(value)); |
| } |
| |
| |
| template <> |
| int16_t DataViewConvertValue<int16_t>(double value) { |
| return static_cast<int16_t>(DoubleToInt32(value)); |
| } |
| |
| |
| template <> |
| int32_t DataViewConvertValue<int32_t>(double value) { |
| return DoubleToInt32(value); |
| } |
| |
| |
| template <> |
| uint8_t DataViewConvertValue<uint8_t>(double value) { |
| return static_cast<uint8_t>(DoubleToUint32(value)); |
| } |
| |
| |
| template <> |
| uint16_t DataViewConvertValue<uint16_t>(double value) { |
| return static_cast<uint16_t>(DoubleToUint32(value)); |
| } |
| |
| |
| template <> |
| uint32_t DataViewConvertValue<uint32_t>(double value) { |
| return DoubleToUint32(value); |
| } |
| |
| |
| template <> |
| float DataViewConvertValue<float>(double value) { |
| return static_cast<float>(value); |
| } |
| |
| |
| template <> |
| double DataViewConvertValue<double>(double value) { |
| return value; |
| } |
| |
| |
| #define DATA_VIEW_SETTER(TypeName, Type) \ |
| RUNTIME_FUNCTION(Runtime_DataViewSet##TypeName) { \ |
| HandleScope scope(isolate); \ |
| DCHECK(args.length() == 4); \ |
| CONVERT_ARG_HANDLE_CHECKED(JSDataView, holder, 0); \ |
| CONVERT_NUMBER_ARG_HANDLE_CHECKED(offset, 1); \ |
| CONVERT_NUMBER_ARG_HANDLE_CHECKED(value, 2); \ |
| CONVERT_BOOLEAN_ARG_CHECKED(is_little_endian, 3); \ |
| Type v = DataViewConvertValue<Type>(value->Number()); \ |
| if (DataViewSetValue(isolate, holder, offset, is_little_endian, v)) { \ |
| return isolate->heap()->undefined_value(); \ |
| } else { \ |
| THROW_NEW_ERROR_RETURN_FAILURE( \ |
| isolate, \ |
| NewRangeError(MessageTemplate::kInvalidDataViewAccessorOffset)); \ |
| } \ |
| } |
| |
| DATA_VIEW_SETTER(Uint8, uint8_t) |
| DATA_VIEW_SETTER(Int8, int8_t) |
| DATA_VIEW_SETTER(Uint16, uint16_t) |
| DATA_VIEW_SETTER(Int16, int16_t) |
| DATA_VIEW_SETTER(Uint32, uint32_t) |
| DATA_VIEW_SETTER(Int32, int32_t) |
| DATA_VIEW_SETTER(Float32, float) |
| DATA_VIEW_SETTER(Float64, double) |
| |
| #undef DATA_VIEW_SETTER |
| } // namespace internal |
| } // namespace v8 |