// Copyright 2012 the V8 project authors. All rights reserved.
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// Use of this source code is governed by a BSD-style license that can be
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// found in the LICENSE file.
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#ifndef V8_ARGUMENTS_H_
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#define V8_ARGUMENTS_H_
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#include "src/allocation.h"
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#include "src/objects.h"
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#include "src/tracing/trace-event.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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//
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// Note that length_ (whose value is in the integer range) is defined
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// as intptr_t to provide endian-neutrality on 64-bit archs.
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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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DCHECK_GE(length_, 0);
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}
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Object*& operator[] (int index) {
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DCHECK_GE(index, 0);
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DCHECK_LT(static_cast<uint32_t>(index), static_cast<uint32_t>(length_));
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return *(reinterpret_cast<Object**>(reinterpret_cast<intptr_t>(arguments_) -
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index * kPointerSize));
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}
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template <class S = Object>
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inline Handle<S> at(int index);
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inline int smi_at(int index);
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inline double number_at(int index);
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// Get the total number of arguments including the receiver.
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int length() const { return static_cast<int>(length_); }
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Object** arguments() { return arguments_; }
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Object** lowest_address() { return &this->operator[](length() - 1); }
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Object** highest_address() { return &this->operator[](0); }
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private:
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intptr_t length_;
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Object** arguments_;
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};
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template <>
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inline Handle<Object> Arguments::at(int index) {
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Object** value = &((*this)[index]);
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return Handle<Object>(value);
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}
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double ClobberDoubleRegisters(double x1, double x2, double x3, double x4);
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#ifdef DEBUG
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#define CLOBBER_DOUBLE_REGISTERS() ClobberDoubleRegisters(1, 2, 3, 4);
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#else
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#define CLOBBER_DOUBLE_REGISTERS()
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#endif
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// TODO(cbruni): add global flag to check whether any tracing events have been
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// enabled.
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#define RUNTIME_FUNCTION_RETURNS_TYPE(Type, Name) \
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static V8_INLINE Type __RT_impl_##Name(Arguments args, Isolate* isolate); \
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\
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V8_NOINLINE static Type Stats_##Name(int args_length, Object** args_object, \
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Isolate* isolate) { \
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RuntimeCallTimerScope timer(isolate, RuntimeCallCounterId::k##Name); \
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TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("v8.runtime"), \
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"V8.Runtime_" #Name); \
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Arguments args(args_length, args_object); \
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return __RT_impl_##Name(args, isolate); \
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} \
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\
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Type Name(int args_length, Object** args_object, Isolate* isolate) { \
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DCHECK(isolate->context() == nullptr || isolate->context()->IsContext()); \
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CLOBBER_DOUBLE_REGISTERS(); \
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if (V8_UNLIKELY(FLAG_runtime_stats)) { \
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return Stats_##Name(args_length, args_object, isolate); \
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} \
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Arguments args(args_length, args_object); \
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return __RT_impl_##Name(args, isolate); \
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} \
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\
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static Type __RT_impl_##Name(Arguments args, Isolate* isolate)
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#define RUNTIME_FUNCTION(Name) RUNTIME_FUNCTION_RETURNS_TYPE(Object*, Name)
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#define RUNTIME_FUNCTION_RETURN_PAIR(Name) \
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RUNTIME_FUNCTION_RETURNS_TYPE(ObjectPair, Name)
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} // namespace internal
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} // namespace v8
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#endif // V8_ARGUMENTS_H_
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