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// 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_H_
#define V8_VM_STATE_H_
namespace v8 {
namespace internal {
class VMState BASE_EMBEDDED {
#ifdef ENABLE_VMSTATE_TRACKING
public:
inline VMState(StateTag state);
inline ~VMState();
StateTag state() { return state_; }
void set_external_callback(Address external_callback) {
external_callback_ = external_callback;
}
// Used for debug asserts.
static bool is_outermost_external() {
return current_state_ == NULL;
}
static StateTag current_state() {
return current_state_ ? current_state_->state() : EXTERNAL;
}
static Address external_callback() {
return current_state_ ? current_state_->external_callback_ : NULL;
}
private:
bool disabled_;
StateTag state_;
VMState* previous_;
Address external_callback_;
// A stack of VM states.
static VMState* current_state_;
#else
public:
explicit VMState(StateTag state) {}
#endif
};
} } // namespace v8::internal
#endif // V8_VM_STATE_H_
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