v8/src/log-inl.h
mikhail.naganov@gmail.com 9d440fdd36 Store API callback entry address prior to entering a callback.
Callback entry address is stored in VMState and is later retrieved by
profiler stack sampler. This makes possible relating API entry to JS
stack, and this is simpler than trying to unwind native stack.

Review URL: http://codereview.chromium.org/437004

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@3344 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
2009-11-23 14:43:00 +00:00

127 lines
3.9 KiB
C++

// Copyright 2006-2009 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_LOG_INL_H_
#define V8_LOG_INL_H_
#include "log.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_LOGGING_AND_PROFILING
inline const char* StateToString(StateTag state) {
switch (state) {
case JS:
return "JS";
case GC:
return "GC";
case COMPILER:
return "COMPILER";
case OTHER:
return "OTHER";
default:
UNREACHABLE();
return NULL;
}
}
VMState::VMState(StateTag state) : disabled_(true), external_callback_(NULL) {
if (!Logger::is_logging()) {
return;
}
disabled_ = false;
#if !defined(ENABLE_HEAP_PROTECTION)
// When not protecting the heap, there is no difference between
// EXTERNAL and OTHER. As an optimization in that case, we will not
// perform EXTERNAL->OTHER transitions through the API. We thus
// compress the two states into one.
if (state == EXTERNAL) state = OTHER;
#endif
state_ = state;
previous_ = Logger::current_state_;
Logger::current_state_ = this;
if (FLAG_log_state_changes) {
LOG(UncheckedStringEvent("Entering", StateToString(state_)));
if (previous_ != NULL) {
LOG(UncheckedStringEvent("From", StateToString(previous_->state_)));
}
}
#ifdef ENABLE_HEAP_PROTECTION
if (FLAG_protect_heap && previous_ != NULL) {
if (state_ == EXTERNAL) {
// We are leaving V8.
ASSERT(previous_->state_ != EXTERNAL);
Heap::Protect();
} else if (previous_->state_ == EXTERNAL) {
// We are entering V8.
Heap::Unprotect();
}
}
#endif
}
VMState::~VMState() {
if (disabled_) return;
Logger::current_state_ = previous_;
if (FLAG_log_state_changes) {
LOG(UncheckedStringEvent("Leaving", StateToString(state_)));
if (previous_ != NULL) {
LOG(UncheckedStringEvent("To", StateToString(previous_->state_)));
}
}
#ifdef ENABLE_HEAP_PROTECTION
if (FLAG_protect_heap && previous_ != NULL) {
if (state_ == EXTERNAL) {
// We are reentering V8.
ASSERT(previous_->state_ != EXTERNAL);
Heap::Unprotect();
} else if (previous_->state_ == EXTERNAL) {
// We are leaving V8.
Heap::Protect();
}
}
#endif
}
#endif
} } // namespace v8::internal
#endif // V8_LOG_INL_H_