v8/src/code.h

75 lines
2.7 KiB
C++

// Copyright 2006-2008 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_CODE_H_
#define V8_CODE_H_
#include "allocation.h"
#include "handles.h"
#include "objects.h"
namespace v8 {
namespace internal {
// Wrapper class for passing expected and actual parameter counts as
// either registers or immediate values. Used to make sure that the
// caller provides exactly the expected number of parameters to the
// callee.
class ParameterCount BASE_EMBEDDED {
public:
explicit ParameterCount(Register reg)
: reg_(reg), immediate_(0) { }
explicit ParameterCount(int immediate)
: reg_(no_reg), immediate_(immediate) { }
explicit ParameterCount(Handle<JSFunction> f)
: reg_(no_reg), immediate_(f->shared()->formal_parameter_count()) { }
bool is_reg() const { return !reg_.is(no_reg); }
bool is_immediate() const { return !is_reg(); }
Register reg() const {
ASSERT(is_reg());
return reg_;
}
int immediate() const {
ASSERT(is_immediate());
return immediate_;
}
private:
const Register reg_;
const int immediate_;
DISALLOW_IMPLICIT_CONSTRUCTORS(ParameterCount);
};
} } // namespace v8::internal
#endif // V8_CODE_H_