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// Copyright 2018 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/utils/memcopy.h"
#include "src/snapshot/embedded/embedded-data.h"
namespace v8 {
namespace internal {
#if V8_TARGET_ARCH_IA32
static void MemMoveWrapper(void* dest, const void* src, size_t size) {
memmove(dest, src, size);
}
// Initialize to library version so we can call this at any time during startup.
static MemMoveFunction memmove_function = &MemMoveWrapper;
// Copy memory area to disjoint memory area.
V8_EXPORT_PRIVATE void MemMove(void* dest, const void* src, size_t size) {
if (size == 0) return;
// Note: here we rely on dependent reads being ordered. This is true
// on all architectures we currently support.
(*memmove_function)(dest, src, size);
}
#elif V8_OS_POSIX && V8_HOST_ARCH_ARM
void MemCopyUint16Uint8Wrapper(uint16_t* dest, const uint8_t* src,
size_t chars) {
uint16_t* limit = dest + chars;
while (dest < limit) {
*dest++ = static_cast<uint16_t>(*src++);
}
}
V8_EXPORT_PRIVATE MemCopyUint8Function memcopy_uint8_function =
&MemCopyUint8Wrapper;
MemCopyUint16Uint8Function memcopy_uint16_uint8_function =
&MemCopyUint16Uint8Wrapper;
#elif V8_OS_POSIX && V8_HOST_ARCH_MIPS
V8_EXPORT_PRIVATE MemCopyUint8Function memcopy_uint8_function =
&MemCopyUint8Wrapper;
#endif
void init_memcopy_functions() {
#if V8_TARGET_ARCH_IA32
if (Isolate::CurrentEmbeddedBlobIsBinaryEmbedded()) {
EmbeddedData d = EmbeddedData::FromBlob();
memmove_function = reinterpret_cast<MemMoveFunction>(
d.InstructionStartOfBuiltin(Builtins::kMemMove));
}
#elif V8_OS_POSIX && V8_HOST_ARCH_ARM
if (Isolate::CurrentEmbeddedBlobIsBinaryEmbedded()) {
EmbeddedData d = EmbeddedData::FromBlob();
memcopy_uint8_function = reinterpret_cast<MemCopyUint8Function>(
d.InstructionStartOfBuiltin(Builtins::kMemCopyUint8Uint8));
memcopy_uint16_uint8_function =
reinterpret_cast<MemCopyUint16Uint8Function>(
d.InstructionStartOfBuiltin(Builtins::kMemCopyUint16Uint8));
}
#elif V8_OS_POSIX && V8_HOST_ARCH_MIPS
if (Isolate::CurrentEmbeddedBlobIsBinaryEmbedded()) {
EmbeddedData d = EmbeddedData::FromBlob();
memcopy_uint8_function = reinterpret_cast<MemCopyUint8Function>(
d.InstructionStartOfBuiltin(Builtins::kMemCopyUint8Uint8));
}
#endif
}
} // namespace internal
} // namespace v8