v8/src/vm-state-inl.h
vitalyr@chromium.org 7976ca2cbc Merge isolates to bleeding_edge.
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@7271 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2011-03-18 20:35:07 +00:00

139 lines
4.2 KiB
C++

// Copyright 2010 the V8 project authors. All rights reserved.
// Redistribution and use in source and binary forms, with or without
// modification, are permitted provided that the following conditions are
// met:
//
// * Redistributions of source code must retain the above copyright
// notice, this list of conditions and the following disclaimer.
// * Redistributions in binary form must reproduce the above
// copyright notice, this list of conditions and the following
// disclaimer in the documentation and/or other materials provided
// with the distribution.
// * Neither the name of Google Inc. nor the names of its
// contributors may be used to endorse or promote products derived
// from this software without specific prior written permission.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
#ifndef V8_VM_STATE_INL_H_
#define V8_VM_STATE_INL_H_
#include "vm-state.h"
#include "runtime-profiler.h"
namespace v8 {
namespace internal {
//
// VMState class implementation. A simple stack of VM states held by the
// logger and partially threaded through the call stack. States are pushed by
// VMState construction and popped by destruction.
//
#ifdef ENABLE_VMSTATE_TRACKING
inline const char* StateToString(StateTag state) {
switch (state) {
case JS:
return "JS";
case GC:
return "GC";
case COMPILER:
return "COMPILER";
case OTHER:
return "OTHER";
case EXTERNAL:
return "EXTERNAL";
default:
UNREACHABLE();
return NULL;
}
}
VMState::VMState(Isolate* isolate, StateTag tag)
: isolate_(isolate), previous_tag_(isolate->current_vm_state()) {
#ifdef ENABLE_LOGGING_AND_PROFILING
if (FLAG_log_state_changes) {
LOG(isolate, UncheckedStringEvent("Entering", StateToString(tag)));
LOG(isolate, UncheckedStringEvent("From", StateToString(previous_tag_)));
}
#endif
isolate_->SetCurrentVMState(tag);
#ifdef ENABLE_HEAP_PROTECTION
if (FLAG_protect_heap) {
if (tag == EXTERNAL) {
// We are leaving V8.
ASSERT(previous_tag_ != EXTERNAL);
isolate_->heap()->Protect();
} else if (previous_tag_ = EXTERNAL) {
// We are entering V8.
isolate_->heap()->Unprotect();
}
}
#endif
}
VMState::~VMState() {
#ifdef ENABLE_LOGGING_AND_PROFILING
if (FLAG_log_state_changes) {
LOG(isolate_,
UncheckedStringEvent("Leaving",
StateToString(isolate_->current_vm_state())));
LOG(isolate_,
UncheckedStringEvent("To", StateToString(previous_tag_)));
}
#endif // ENABLE_LOGGING_AND_PROFILING
#ifdef ENABLE_HEAP_PROTECTION
StateTag tag = isolate_->current_vm_state();
#endif
isolate_->SetCurrentVMState(previous_tag_);
#ifdef ENABLE_HEAP_PROTECTION
if (FLAG_protect_heap) {
if (tag == EXTERNAL) {
// We are reentering V8.
ASSERT(previous_tag_ != EXTERNAL);
isolate_->heap()->Unprotect();
} else if (previous_tag_ == EXTERNAL) {
// We are leaving V8.
isolate_->heap()->Protect();
}
}
#endif // ENABLE_HEAP_PROTECTION
}
#endif // ENABLE_VMSTATE_TRACKING
#ifdef ENABLE_LOGGING_AND_PROFILING
ExternalCallbackScope::ExternalCallbackScope(Isolate* isolate, Address callback)
: isolate_(isolate), previous_callback_(isolate->external_callback()) {
isolate_->set_external_callback(callback);
}
ExternalCallbackScope::~ExternalCallbackScope() {
isolate_->set_external_callback(previous_callback_);
}
#endif // ENABLE_LOGGING_AND_PROFILING
} } // namespace v8::internal
#endif // V8_VM_STATE_INL_H_