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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 "log.h"
     33 #include "simulator.h"
     34 
     35 namespace v8 {
     36 namespace internal {
     37 
     38 //
     39 // VMState class implementation.  A simple stack of VM states held by the
     40 // logger and partially threaded through the call stack.  States are pushed by
     41 // VMState construction and popped by destruction.
     42 //
     43 inline 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 
     62 template <StateTag Tag>
     63 VMState<Tag>::VMState(Isolate* isolate)
     64     : isolate_(isolate), previous_tag_(isolate->current_vm_state()) {
     65   if (FLAG_log_timer_events && previous_tag_ != EXTERNAL && Tag == EXTERNAL) {
     66     LOG(isolate_,
     67         TimerEvent(Logger::START, Logger::TimerEventScope::v8_external));
     68   }
     69   isolate_->set_current_vm_state(Tag);
     70 }
     71 
     72 
     73 template <StateTag Tag>
     74 VMState<Tag>::~VMState() {
     75   if (FLAG_log_timer_events && previous_tag_ != EXTERNAL && Tag == EXTERNAL) {
     76     LOG(isolate_,
     77         TimerEvent(Logger::END, Logger::TimerEventScope::v8_external));
     78   }
     79   isolate_->set_current_vm_state(previous_tag_);
     80 }
     81 
     82 
     83 ExternalCallbackScope::ExternalCallbackScope(Isolate* isolate, Address callback)
     84     : isolate_(isolate),
     85       callback_(callback),
     86       previous_scope_(isolate->external_callback_scope()) {
     87 #ifdef USE_SIMULATOR
     88   int32_t sp = Simulator::current(isolate)->get_register(Simulator::sp);
     89   scope_address_ = reinterpret_cast<Address>(static_cast<intptr_t>(sp));
     90 #endif
     91   isolate_->set_external_callback_scope(this);
     92 }
     93 
     94 ExternalCallbackScope::~ExternalCallbackScope() {
     95   isolate_->set_external_callback_scope(previous_scope_);
     96 }
     97 
     98 Address ExternalCallbackScope::scope_address() {
     99 #ifdef USE_SIMULATOR
    100   return scope_address_;
    101 #else
    102   return reinterpret_cast<Address>(this);
    103 #endif
    104 }
    105 
    106 
    107 } }  // namespace v8::internal
    108 
    109 #endif  // V8_VM_STATE_INL_H_
    110