1// Copyright 2010 the V8 project authors. All rights reserved.
2// Redistribution and use in source and binary forms, with or without
3// modification, are permitted provided that the following conditions are
4// met:
5//
6//     * Redistributions of source code must retain the above copyright
7//       notice, this list of conditions and the following disclaimer.
8//     * Redistributions in binary form must reproduce the above
9//       copyright notice, this list of conditions and the following
10//       disclaimer in the documentation and/or other materials provided
11//       with the distribution.
12//     * Neither the name of Google Inc. nor the names of its
13//       contributors may be used to endorse or promote products derived
14//       from this software without specific prior written permission.
15//
16// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
17// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
18// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
19// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
20// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
21// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
22// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
23// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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25// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
26// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
27
28#ifndef V8_VM_STATE_INL_H_
29#define V8_VM_STATE_INL_H_
30
31#include "vm-state.h"
32#include "runtime-profiler.h"
33
34namespace v8 {
35namespace internal {
36
37//
38// VMState class implementation.  A simple stack of VM states held by the
39// logger and partially threaded through the call stack.  States are pushed by
40// VMState construction and popped by destruction.
41//
42inline const char* StateToString(StateTag state) {
43  switch (state) {
44    case JS:
45      return "JS";
46    case GC:
47      return "GC";
48    case COMPILER:
49      return "COMPILER";
50    case OTHER:
51      return "OTHER";
52    case EXTERNAL:
53      return "EXTERNAL";
54    default:
55      UNREACHABLE();
56      return NULL;
57  }
58}
59
60
61VMState::VMState(Isolate* isolate, StateTag tag)
62    : isolate_(isolate), previous_tag_(isolate->current_vm_state()) {
63  if (FLAG_log_state_changes) {
64    LOG(isolate, UncheckedStringEvent("Entering", StateToString(tag)));
65    LOG(isolate, UncheckedStringEvent("From", StateToString(previous_tag_)));
66  }
67
68  isolate_->SetCurrentVMState(tag);
69}
70
71
72VMState::~VMState() {
73  if (FLAG_log_state_changes) {
74    LOG(isolate_,
75        UncheckedStringEvent("Leaving",
76                              StateToString(isolate_->current_vm_state())));
77    LOG(isolate_,
78        UncheckedStringEvent("To", StateToString(previous_tag_)));
79  }
80
81  isolate_->SetCurrentVMState(previous_tag_);
82}
83
84
85ExternalCallbackScope::ExternalCallbackScope(Isolate* isolate, Address callback)
86    : isolate_(isolate), previous_callback_(isolate->external_callback()) {
87  isolate_->set_external_callback(callback);
88}
89
90ExternalCallbackScope::~ExternalCallbackScope() {
91  isolate_->set_external_callback(previous_callback_);
92}
93
94
95} }  // namespace v8::internal
96
97#endif  // V8_VM_STATE_INL_H_
98