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// Copyright 2010 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_VM_STATE_H_
#define V8_EXECUTION_VM_STATE_H_
#include "include/v8-unwinder.h"
#include "src/common/globals.h"
#include "src/logging/counters-scopes.h"
#include "v8-internal.h"
namespace v8 {
namespace internal {
// Logging and profiling. A StateTag represents a possible state of the VM. The
// logger maintains a stack of these. Creating a VMState object enters a state
// by pushing on the stack, and destroying a VMState object leaves a state by
// popping the current state from the stack.
template <StateTag Tag>
class VMState {
public:
explicit inline VMState(Isolate* isolate);
inline ~VMState();
private:
Isolate* const isolate_;
StateTag const previous_tag_;
friend ExternalCallbackScope;
};
class V8_NODISCARD ExternalCallbackScope {
public:
inline ExternalCallbackScope(Isolate* isolate, Address callback);
inline ~ExternalCallbackScope();
Address callback() { return callback_; }
Address* callback_entrypoint_address() {
if (callback_ == kNullAddress) return nullptr;
#if USES_FUNCTION_DESCRIPTORS
return FUNCTION_ENTRYPOINT_ADDRESS(callback_);
#else
return const_cast<Address*>(&callback_);
#endif
}
ExternalCallbackScope* previous() { return previous_scope_; }
inline Address scope_address();
private:
Address const callback_;
ExternalCallbackScope* const previous_scope_;
VMState<EXTERNAL> const vm_state_;
PauseNestedTimedHistogramScope const pause_timed_histogram_scope_;
#ifdef USE_SIMULATOR
Address scope_address_;
#endif
};
} // namespace internal
} // namespace v8
#endif // V8_EXECUTION_VM_STATE_H_
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