V8 API Reference, 7.2.502.16 (for Deno 0.2.4)
vm-state.h
1 // Copyright 2010 the V8 project authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4 
5 #ifndef V8_VM_STATE_H_
6 #define V8_VM_STATE_H_
7 
8 #include "src/allocation.h"
9 #include "src/counters.h"
10 
11 namespace v8 {
12 namespace internal {
13 
14 // Logging and profiling. A StateTag represents a possible state of
15 // the VM. The logger maintains a stack of these. Creating a VMState
16 // object enters a state by pushing on the stack, and destroying a
17 // VMState object leaves a state by popping the current state from the
18 // stack.
19 template <StateTag Tag>
20 class VMState {
21  public:
22  explicit inline VMState(Isolate* isolate);
23  inline ~VMState();
24 
25  private:
26  Isolate* isolate_;
27  StateTag previous_tag_;
28 };
29 
31  public:
32  inline ExternalCallbackScope(Isolate* isolate, Address callback);
33  inline ~ExternalCallbackScope();
34  Address callback() { return callback_; }
35  Address* callback_entrypoint_address() {
36  if (callback_ == kNullAddress) return nullptr;
37 #if USES_FUNCTION_DESCRIPTORS
38  return FUNCTION_ENTRYPOINT_ADDRESS(callback_);
39 #else
40  return &callback_;
41 #endif
42  }
43  ExternalCallbackScope* previous() { return previous_scope_; }
44  inline Address scope_address();
45 
46  private:
47  Isolate* isolate_;
48  Address callback_;
49  ExternalCallbackScope* previous_scope_;
50 #ifdef USE_SIMULATOR
51  Address scope_address_;
52 #endif
53 };
54 
55 } // namespace internal
56 } // namespace v8
57 
58 
59 #endif // V8_VM_STATE_H_
Definition: libplatform.h:13