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 24// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 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// 42#ifdef ENABLE_VMSTATE_TRACKING 43inline const char* StateToString(StateTag state) { 44 switch (state) { 45 case JS: 46 return "JS"; 47 case GC: 48 return "GC"; 49 case COMPILER: 50 return "COMPILER"; 51 case OTHER: 52 return "OTHER"; 53 case EXTERNAL: 54 return "EXTERNAL"; 55 default: 56 UNREACHABLE(); 57 return NULL; 58 } 59} 60 61 62VMState::VMState(Isolate* isolate, StateTag tag) 63 : isolate_(isolate), previous_tag_(isolate->current_vm_state()) { 64#ifdef ENABLE_LOGGING_AND_PROFILING 65 if (FLAG_log_state_changes) { 66 LOG(isolate, UncheckedStringEvent("Entering", StateToString(tag))); 67 LOG(isolate, UncheckedStringEvent("From", StateToString(previous_tag_))); 68 } 69#endif 70 71 isolate_->SetCurrentVMState(tag); 72 73#ifdef ENABLE_HEAP_PROTECTION 74 if (FLAG_protect_heap) { 75 if (tag == EXTERNAL) { 76 // We are leaving V8. 77 ASSERT(previous_tag_ != EXTERNAL); 78 isolate_->heap()->Protect(); 79 } else if (previous_tag_ = EXTERNAL) { 80 // We are entering V8. 81 isolate_->heap()->Unprotect(); 82 } 83 } 84#endif 85} 86 87 88VMState::~VMState() { 89#ifdef ENABLE_LOGGING_AND_PROFILING 90 if (FLAG_log_state_changes) { 91 LOG(isolate_, 92 UncheckedStringEvent("Leaving", 93 StateToString(isolate_->current_vm_state()))); 94 LOG(isolate_, 95 UncheckedStringEvent("To", StateToString(previous_tag_))); 96 } 97#endif // ENABLE_LOGGING_AND_PROFILING 98 99#ifdef ENABLE_HEAP_PROTECTION 100 StateTag tag = isolate_->current_vm_state(); 101#endif 102 103 isolate_->SetCurrentVMState(previous_tag_); 104 105#ifdef ENABLE_HEAP_PROTECTION 106 if (FLAG_protect_heap) { 107 if (tag == EXTERNAL) { 108 // We are reentering V8. 109 ASSERT(previous_tag_ != EXTERNAL); 110 isolate_->heap()->Unprotect(); 111 } else if (previous_tag_ == EXTERNAL) { 112 // We are leaving V8. 113 isolate_->heap()->Protect(); 114 } 115 } 116#endif // ENABLE_HEAP_PROTECTION 117} 118 119#endif // ENABLE_VMSTATE_TRACKING 120 121 122#ifdef ENABLE_LOGGING_AND_PROFILING 123 124ExternalCallbackScope::ExternalCallbackScope(Isolate* isolate, Address callback) 125 : isolate_(isolate), previous_callback_(isolate->external_callback()) { 126 isolate_->set_external_callback(callback); 127} 128 129ExternalCallbackScope::~ExternalCallbackScope() { 130 isolate_->set_external_callback(previous_callback_); 131} 132 133#endif // ENABLE_LOGGING_AND_PROFILING 134 135 136} } // namespace v8::internal 137 138#endif // V8_VM_STATE_INL_H_ 139