90b3370374
git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@5922 ce2b1a6d-e550-0410-aec6-3dcde31c8c00
135 lines
4.0 KiB
C++
135 lines
4.0 KiB
C++
// Copyright 2010 the V8 project authors. All rights reserved.
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// Redistribution and use in source and binary forms, with or without
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// modification, are permitted provided that the following conditions are
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// met:
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//
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// * Redistributions of source code must retain the above copyright
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// notice, this list of conditions and the following disclaimer.
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// * Redistributions in binary form must reproduce the above
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// copyright notice, this list of conditions and the following
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// disclaimer in the documentation and/or other materials provided
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// with the distribution.
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// * Neither the name of Google Inc. nor the names of its
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// contributors may be used to endorse or promote products derived
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// from this software without specific prior written permission.
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//
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// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
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// "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
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// LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
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// A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
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// OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
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// SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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// LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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// DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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// THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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// (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
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// OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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#ifndef V8_VM_STATE_INL_H_
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#define V8_VM_STATE_INL_H_
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#include "vm-state.h"
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#include "runtime-profiler.h"
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namespace v8 {
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namespace internal {
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//
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// VMState class implementation. A simple stack of VM states held by the
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// logger and partially threaded through the call stack. States are pushed by
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// VMState construction and popped by destruction.
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//
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#ifdef ENABLE_VMSTATE_TRACKING
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inline const char* StateToString(StateTag state) {
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switch (state) {
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case JS:
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return "JS";
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case GC:
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return "GC";
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case COMPILER:
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return "COMPILER";
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case OTHER:
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return "OTHER";
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case EXTERNAL:
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return "EXTERNAL";
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default:
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UNREACHABLE();
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return NULL;
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}
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}
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VMState::VMState(StateTag tag) : previous_tag_(Top::current_vm_state()) {
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#ifdef ENABLE_LOGGING_AND_PROFILING
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if (FLAG_log_state_changes) {
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LOG(UncheckedStringEvent("Entering", StateToString(tag)));
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LOG(UncheckedStringEvent("From", StateToString(previous_tag_)));
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}
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#endif
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Top::SetCurrentVMState(tag);
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#ifdef ENABLE_HEAP_PROTECTION
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if (FLAG_protect_heap) {
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if (tag == EXTERNAL) {
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// We are leaving V8.
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ASSERT(previous_tag_ != EXTERNAL);
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Heap::Protect();
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} else if (previous_tag_ = EXTERNAL) {
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// We are entering V8.
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Heap::Unprotect();
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}
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}
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#endif
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}
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VMState::~VMState() {
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#ifdef ENABLE_LOGGING_AND_PROFILING
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if (FLAG_log_state_changes) {
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LOG(UncheckedStringEvent("Leaving",
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StateToString(Top::current_vm_state())));
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LOG(UncheckedStringEvent("To", StateToString(previous_tag_)));
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}
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#endif // ENABLE_LOGGING_AND_PROFILING
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#ifdef ENABLE_HEAP_PROTECTION
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StateTag tag = Top::current_vm_state();
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#endif
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Top::SetCurrentVMState(previous_tag_);
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#ifdef ENABLE_HEAP_PROTECTION
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if (FLAG_protect_heap) {
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if (tag == EXTERNAL) {
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// We are reentering V8.
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ASSERT(previous_tag_ != EXTERNAL);
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Heap::Unprotect();
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} else if (previous_tag_ == EXTERNAL) {
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// We are leaving V8.
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Heap::Protect();
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}
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}
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#endif // ENABLE_HEAP_PROTECTION
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}
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#endif // ENABLE_VMSTATE_TRACKING
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#ifdef ENABLE_LOGGING_AND_PROFILING
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ExternalCallbackScope::ExternalCallbackScope(Address callback)
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: previous_callback_(Top::external_callback()) {
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Top::set_external_callback(callback);
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}
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ExternalCallbackScope::~ExternalCallbackScope() {
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Top::set_external_callback(previous_callback_);
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}
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#endif // ENABLE_LOGGING_AND_PROFILING
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} } // namespace v8::internal
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#endif // V8_VM_STATE_INL_H_
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