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      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 
     34 namespace v8 {
     35 namespace 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 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     case EXTERNAL:
     53       return "EXTERNAL";
     54     default:
     55       UNREACHABLE();
     56       return NULL;
     57   }
     58 }
     59 
     60 
     61 VMState::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 
     72 VMState::~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 
     85 ExternalCallbackScope::ExternalCallbackScope(Isolate* isolate, Address callback)
     86     : isolate_(isolate), previous_callback_(isolate->external_callback()) {
     87   isolate_->set_external_callback(callback);
     88 }
     89 
     90 ExternalCallbackScope::~ExternalCallbackScope() {
     91   isolate_->set_external_callback(previous_callback_);
     92 }
     93 
     94 
     95 } }  // namespace v8::internal
     96 
     97 #endif  // V8_VM_STATE_INL_H_
     98