chromium/v8/src/execution/isolate-data.h

// 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.

#ifndef V8_EXECUTION_ISOLATE_DATA_H_
#define V8_EXECUTION_ISOLATE_DATA_H_

#include "src/builtins/builtins.h"
#include "src/codegen/constants-arch.h"
#include "src/codegen/external-reference-table.h"
#include "src/execution/stack-guard.h"
#include "src/execution/thread-local-top.h"
#include "src/heap/linear-allocation-area.h"
#include "src/init/isolate-group.h"
#include "src/roots/roots.h"
#include "src/sandbox/code-pointer-table.h"
#include "src/sandbox/cppheap-pointer-table.h"
#include "src/sandbox/external-pointer-table.h"
#include "src/sandbox/trusted-pointer-table.h"
#include "src/utils/utils.h"
#include "testing/gtest/include/gtest/gtest_prod.h"  // nogncheck

namespace v8 {
namespace internal {

class Isolate;

#if V8_HOST_ARCH_64_BIT
// No padding is currently required for fast_c_call_XXX and wasm64_oob_offset_
// fields.
#define ISOLATE_DATA_FAST_C_CALL_PADDING(V) …
#else
// Aligns fast_c_call_XXX fields so that they stay in the same CPU cache line.
#define ISOLATE_DATA_FAST_C_CALL_PADDING …
#endif  // V8_HOST_ARCH_64_BIT

#ifdef V8_ENABLE_LEAPTIERING

#define BUILTINS_WITH_DISPATCH_ADAPTER …

#define BUILTINS_WITH_DISPATCH_LIST …

struct JSBuiltinDispatchHandleRoot {
  enum Idx {
#define CASE …
    BUILTINS_WITH_DISPATCH_LIST(CASE)

        kCount,
    kFirst = 0
#undef CASE
  };

  static inline Builtin to_builtin(Idx idx) {
#define CASE …
    return std::array<Builtin, Idx::kCount>{
        BUILTINS_WITH_DISPATCH_LIST(CASE)}[idx];
#undef CASE
  }
  static inline Idx to_idx(Builtin builtin) {
    switch (builtin) {
#define CASE …
      BUILTINS_WITH_DISPATCH_LIST(CASE)
#undef CASE
      default:
        UNREACHABLE();
    }
  }

  static inline Idx to_idx(RootIndex root_idx) {
    switch (root_idx) {
#define CASE …
      BUILTINS_WITH_DISPATCH_LIST(CASE)
#undef CASE
      default:
        UNREACHABLE();
    }
  }
};

#endif  // V8_ENABLE_LEAPTIERING

// IsolateData fields, defined as: V(CamelName, Size, hacker_name)
#define ISOLATE_DATA_FIELDS(V) …

#ifdef V8_COMPRESS_POINTERS
#define ISOLATE_DATA_FIELDS_POINTER_COMPRESSION(V) …
#else
#define ISOLATE_DATA_FIELDS_POINTER_COMPRESSION …
#endif  // V8_COMPRESS_POINTERS

#ifdef V8_ENABLE_SANDBOX
#define ISOLATE_DATA_FIELDS_SANDBOX(V) …
#else
#define ISOLATE_DATA_FIELDS_SANDBOX …
#endif  // V8_ENABLE_SANDBOX

#define EXTERNAL_REFERENCE_LIST_ISOLATE_FIELDS(V) …

constexpr uint8_t kNumIsolateFieldIds = …;
#undef PLUS_1

enum class IsolateFieldId : uint8_t { … };

// This class contains a collection of data accessible from both C++ runtime
// and compiled code (including builtins, interpreter bytecode handlers and
// optimized code). The compiled code accesses the isolate data fields
// indirectly via the root register.
class IsolateData final { … };

// IsolateData object must have "predictable" layout which does not change when
// cross-compiling to another platform. Otherwise there may be compatibility
// issues because of different compilers used for snapshot generator and
// actual V8 code.
void IsolateData::AssertPredictableLayout() { … }

}  // namespace internal
}  // namespace v8

#endif  // V8_EXECUTION_ISOLATE_DATA_H_