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// Copyright 2017 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_SERVICES_HEAP_PROFILING_ADDRESS_H_
#define COMPONENTS_SERVICES_HEAP_PROFILING_ADDRESS_H_
#include <stdint.h>
#include <functional>
#include <iosfwd>
#include "base/hash.h"
namespace heap_profiling {
// Wrapper around an address in the instrumented process. This wrapper should
// be a zero-overhead abstraction around a 64-bit integer (so pass by value)
// that prevents getting confused between addresses in the local process and
// ones in the instrumented process.
struct Address {
Address() : value(0) {}
explicit Address(uint64_t v) : value(v) {}
uint64_t value;
bool operator<(Address other) const { return value < other.value; }
bool operator<=(Address other) const { return value <= other.value; }
bool operator>(Address other) const { return value > other.value; }
bool operator>=(Address other) const { return value >= other.value; }
bool operator==(Address other) const { return value == other.value; }
bool operator!=(Address other) const { return value != other.value; }
Address operator+(int64_t delta) const { return Address(value + delta); }
Address operator+=(int64_t delta) {
value += delta;
return *this;
}
Address operator-(int64_t delta) const { return Address(value - delta); }
Address operator-=(int64_t delta) {
value -= delta;
return *this;
}
int64_t operator-(Address a) const { return value - a.value; }
};
} // namespace heap_profiling
namespace std {
template <>
struct hash<heap_profiling::Address> {
typedef heap_profiling::Address argument_type;
typedef uint32_t result_type;
result_type operator()(argument_type a) const {
return base::Hash(&a.value, sizeof(int64_t));
}
};
} // namespace std
#endif // COMPONENTS_SERVICES_HEAP_PROFILING_ADDRESS_H_
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