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Current File : //home/ubuntu/node-v16.18.1/deps/v8/src/utils/memcopy.cc
// 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.
DISABLE_CFI_ICALL
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_OS_STARBOARD) && V8_HOST_ARCH_ARM
V8_EXPORT_PRIVATE MemCopyUint8Function memcopy_uint8_function =
    &MemCopyUint8Wrapper;
#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(Builtin::kMemMove));
  }
#elif(V8_OS_POSIX || V8_OS_STARBOARD) && V8_HOST_ARCH_ARM
  if (Isolate::CurrentEmbeddedBlobIsBinaryEmbedded()) {
    EmbeddedData d = EmbeddedData::FromBlob();
    memcopy_uint8_function = reinterpret_cast<MemCopyUint8Function>(
        d.InstructionStartOfBuiltin(Builtin::kMemCopyUint8Uint8));
  }
#elif V8_OS_POSIX && V8_HOST_ARCH_MIPS
  if (Isolate::CurrentEmbeddedBlobIsBinaryEmbedded()) {
    EmbeddedData d = EmbeddedData::FromBlob();
    memcopy_uint8_function = reinterpret_cast<MemCopyUint8Function>(
        d.InstructionStartOfBuiltin(Builtin::kMemCopyUint8Uint8));
  }
#endif
}

}  // namespace internal
}  // namespace v8

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