chromium/v8/src/libplatform/default-thread-isolated-allocator.cc

// Copyright 2023 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/libplatform/default-thread-isolated-allocator.h"

#if V8_HAS_PKU_JIT_WRITE_PROTECT

#if !V8_OS_LINUX
#error pkey support in this file is only implemented on Linux
#endif

#include <sys/mman.h>
#include <sys/syscall.h>
#include <sys/utsname.h>
#include <unistd.h>
#endif

#if V8_HAS_PKU_JIT_WRITE_PROTECT

extern int pkey_alloc(unsigned int flags, unsigned int access_rights) V8_WEAK;
extern int pkey_free(int pkey) V8_WEAK;

namespace {

bool KernelHasPkruFix() { … }

int PkeyAlloc() { … }

int PkeyFree(int pkey) { … }

}  // namespace

#endif  // V8_HAS_PKU_JIT_WRITE_PROTECT

namespace v8::platform {

DefaultThreadIsolatedAllocator::DefaultThreadIsolatedAllocator()
#if V8_HAS_PKU_JIT_WRITE_PROTECT
    : … { … }

DefaultThreadIsolatedAllocator::~DefaultThreadIsolatedAllocator() { … }

// TODO(sroettger): this should return thread isolated (e.g. pkey-tagged) memory
//                  for testing.
void* DefaultThreadIsolatedAllocator::Allocate(size_t size) { … }

void DefaultThreadIsolatedAllocator::Free(void* object) { … }

enum DefaultThreadIsolatedAllocator::Type DefaultThreadIsolatedAllocator::Type()
    const { … }

int DefaultThreadIsolatedAllocator::Pkey() const { … }

bool DefaultThreadIsolatedAllocator::Valid() const { … }

}  // namespace v8::platform