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96 lines
3.3 KiB
96 lines
3.3 KiB
// Copyright 2006-2008 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_ARGUMENTS_H_
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#define V8_ARGUMENTS_H_
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namespace v8 {
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namespace internal {
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// Arguments provides access to runtime call parameters.
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//
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// It uses the fact that the instance fields of Arguments
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// (length_, arguments_) are "overlayed" with the parameters
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// (no. of parameters, and the parameter pointer) passed so
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// that inside the C++ function, the parameters passed can
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// be accessed conveniently:
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//
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// Object* Runtime_function(Arguments args) {
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// ... use args[i] here ...
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// }
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class Arguments BASE_EMBEDDED {
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public:
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Arguments(int length, Object** arguments)
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: length_(length), arguments_(arguments) { }
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Object*& operator[] (int index) {
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ASSERT(0 <= index && index < length_);
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return arguments_[-index];
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}
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template <class S> Handle<S> at(int index) {
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Object** value = &((*this)[index]);
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// This cast checks that the object we're accessing does indeed have the
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// expected type.
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S::cast(*value);
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return Handle<S>(reinterpret_cast<S**>(value));
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}
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// Get the total number of arguments including the receiver.
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int length() const { return length_; }
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Object** arguments() { return arguments_; }
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private:
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int length_;
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Object** arguments_;
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};
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// Custom arguments replicate a small segment of stack that can be
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// accessed through an Arguments object the same way the actual stack
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// can.
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class CustomArguments : public Relocatable {
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public:
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inline CustomArguments(Object* data,
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JSObject* self,
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JSObject* holder) {
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values_[2] = self;
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values_[1] = holder;
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values_[0] = data;
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}
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void IterateInstance(ObjectVisitor* v);
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Object** end() { return values_ + ARRAY_SIZE(values_) - 1; }
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private:
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Object* values_[3];
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};
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} } // namespace v8::internal
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#endif // V8_ARGUMENTS_H_
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