1 // Copyright 2006-2009 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_LOG_INL_H_ 29 #define V8_LOG_INL_H_ 30 31 #include "log.h" 32 33 namespace v8 { 34 namespace internal { 35 36 // 37 // VMState class implementation. A simple stack of VM states held by the 38 // logger and partially threaded through the call stack. States are pushed by 39 // VMState construction and popped by destruction. 40 // 41 #ifdef ENABLE_LOGGING_AND_PROFILING 42 inline 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 default: 53 UNREACHABLE(); 54 return NULL; 55 } 56 } 57 58 VMState::VMState(StateTag state) : disabled_(true), external_callback_(NULL) { 59 if (!Logger::is_logging()) { 60 return; 61 } 62 63 disabled_ = false; 64 #if !defined(ENABLE_HEAP_PROTECTION) 65 // When not protecting the heap, there is no difference between 66 // EXTERNAL and OTHER. As an optimization in that case, we will not 67 // perform EXTERNAL->OTHER transitions through the API. We thus 68 // compress the two states into one. 69 if (state == EXTERNAL) state = OTHER; 70 #endif 71 state_ = state; 72 previous_ = Logger::current_state_; 73 Logger::current_state_ = this; 74 75 if (FLAG_log_state_changes) { 76 LOG(UncheckedStringEvent("Entering", StateToString(state_))); 77 if (previous_ != NULL) { 78 LOG(UncheckedStringEvent("From", StateToString(previous_->state_))); 79 } 80 } 81 82 #ifdef ENABLE_HEAP_PROTECTION 83 if (FLAG_protect_heap && previous_ != NULL) { 84 if (state_ == EXTERNAL) { 85 // We are leaving V8. 86 ASSERT(previous_->state_ != EXTERNAL); 87 Heap::Protect(); 88 } else if (previous_->state_ == EXTERNAL) { 89 // We are entering V8. 90 Heap::Unprotect(); 91 } 92 } 93 #endif 94 } 95 96 97 VMState::~VMState() { 98 if (disabled_) return; 99 Logger::current_state_ = previous_; 100 101 if (FLAG_log_state_changes) { 102 LOG(UncheckedStringEvent("Leaving", StateToString(state_))); 103 if (previous_ != NULL) { 104 LOG(UncheckedStringEvent("To", StateToString(previous_->state_))); 105 } 106 } 107 108 #ifdef ENABLE_HEAP_PROTECTION 109 if (FLAG_protect_heap && previous_ != NULL) { 110 if (state_ == EXTERNAL) { 111 // We are reentering V8. 112 ASSERT(previous_->state_ != EXTERNAL); 113 Heap::Unprotect(); 114 } else if (previous_->state_ == EXTERNAL) { 115 // We are leaving V8. 116 Heap::Protect(); 117 } 118 } 119 #endif 120 } 121 #endif 122 123 124 } } // namespace v8::internal 125 126 #endif // V8_LOG_INL_H_ 127