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_INL_H_
6 #define V8_VM_STATE_INL_H_
7 
8 #include "src/vm-state.h"
9 #include "src/log.h"
10 #include "src/simulator.h"
11 
12 namespace v8 {
13 namespace internal {
14 
15 //
16 // VMState class implementation.  A simple stack of VM states held by the
17 // logger and partially threaded through the call stack.  States are pushed by
18 // VMState construction and popped by destruction.
19 //
StateToString(StateTag state)20 inline const char* StateToString(StateTag state) {
21   switch (state) {
22     case JS:
23       return "JS";
24     case GC:
25       return "GC";
26     case COMPILER:
27       return "COMPILER";
28     case OTHER:
29       return "OTHER";
30     case EXTERNAL:
31       return "EXTERNAL";
32     default:
33       UNREACHABLE();
34       return NULL;
35   }
36 }
37 
38 
39 template <StateTag Tag>
VMState(Isolate * isolate)40 VMState<Tag>::VMState(Isolate* isolate)
41     : isolate_(isolate), previous_tag_(isolate->current_vm_state()) {
42   if (FLAG_log_timer_events && previous_tag_ != EXTERNAL && Tag == EXTERNAL) {
43     LOG(isolate_, TimerEvent(Logger::START, TimerEventExternal::name()));
44   }
45   isolate_->set_current_vm_state(Tag);
46 }
47 
48 
49 template <StateTag Tag>
~VMState()50 VMState<Tag>::~VMState() {
51   if (FLAG_log_timer_events && previous_tag_ != EXTERNAL && Tag == EXTERNAL) {
52     LOG(isolate_, TimerEvent(Logger::END, TimerEventExternal::name()));
53   }
54   isolate_->set_current_vm_state(previous_tag_);
55 }
56 
57 
ExternalCallbackScope(Isolate * isolate,Address callback)58 ExternalCallbackScope::ExternalCallbackScope(Isolate* isolate, Address callback)
59     : isolate_(isolate),
60       callback_(callback),
61       previous_scope_(isolate->external_callback_scope()) {
62 #ifdef USE_SIMULATOR
63   scope_address_ = Simulator::current(isolate)->get_sp();
64 #endif
65   isolate_->set_external_callback_scope(this);
66 }
67 
~ExternalCallbackScope()68 ExternalCallbackScope::~ExternalCallbackScope() {
69   isolate_->set_external_callback_scope(previous_scope_);
70 }
71 
scope_address()72 Address ExternalCallbackScope::scope_address() {
73 #ifdef USE_SIMULATOR
74   return scope_address_;
75 #else
76   return reinterpret_cast<Address>(this);
77 #endif
78 }
79 
80 
81 } }  // namespace v8::internal
82 
83 #endif  // V8_VM_STATE_INL_H_
84