Add out-of-process memory logging stream parsing.

chrome/profiling/address.h

+// 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 CHROME_PROFILING_ADDRESS_H_
+#define CHROME_PROFILING_ADDRESS_H_
+
+#include <stdint.h>
+
+#include <functional>
+#include <iosfwd>
+
+#include "base/hash.h"
+
+namespace 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 profiling
+
+namespace std {
+
+template <>
+struct hash<profiling::Address> {
+  typedef profiling::Address argument_type;
+  typedef uint32_t result_type;
+  result_type operator()(argument_type a) const {
+    return base::Hash(reinterpret_cast<char*>(&a.value), sizeof(int64_t));
+  }
+};
+
+}  // namespace std
+
+std::ostream& operator<<(std::ostream& out, profiling::Address a);
+
+#endif  // CHROME_PROFILING_ADDRESS_H_