Add SystemSnapshotMac and its test

snapshot/system_snapshot_mac.h

Index: snapshot/system_snapshot_mac.h
diff --git a/snapshot/system_snapshot_mac.h b/snapshot/system_snapshot_mac.h
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+// Copyright 2014 The Crashpad Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//     http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+#ifndef CRASHPAD_SNAPSHOT_SYSTEM_SNAPSHOT_MAC_H_
+#define CRASHPAD_SNAPSHOT_SYSTEM_SNAPSHOT_MAC_H_
+
+#include <stdint.h>
+
+#include <string>
+
+#include "base/basictypes.h"
+#include "snapshot/system_snapshot.h"
+#include "util/misc/initialization_state_dcheck.h"
+
+namespace crashpad {
+
+class ProcessReader;
+
+namespace internal {
+
+//! \brief A SystemSnapshot of the running system, when the system runs Mac OS
+//!     X.
+class SystemSnapshotMac final : public SystemSnapshot {
+ public:
+  SystemSnapshotMac();
+  ~SystemSnapshotMac();
+
+  //! \brief Initializes the object.
+  //!
+  //! \param[in] process_reader A reader for the process being snapshotted.
+  //!     \n\n
+  //!     It seems odd that a system snapshot implementation would need a
+  //!     ProcessReader, but some of the information reported about the system
+  //!     depends on the process it’s being reported for. For example, the
+  //!     architecture returned by GetCPUArchitecture() should be the
+  //!     architecture of the process, which may be different than the native
+  //!     architecture of the system: an x86_64 system can run both x86_64 and
+  //!     32-bit x86 processes.
+  //! \param[in] snapshot_time The time of the snapshot being taken.
+  //!     \n\n
+  //!     This parameter is necessary for TimeZone() to determine whether
+  //!     daylight saving time was in effect at the time the snapshot was taken.
+  //!     Otherwise, it would need to base its determination on the current
+  //!     time, which may be different than the snapshot time for snapshots
+  //!     generated around the daylight saving transition time.
+  void Initialize(ProcessReader* process_reader, const timeval* snapshot_time);
+
+  // SystemSnapshot:
+
+  virtual CPUArchitecture GetCPUArchitecture() const override;
+  virtual uint32_t CPURevision() const override;
+  virtual uint8_t CPUCount() const override;
+  virtual std::string CPUVendor() const override;
+  virtual void CPUFrequency(uint64_t* current_hz,
+                            uint64_t* max_hz) const override;
+  virtual uint32_t CPUX86Signature() const override;
+  virtual uint64_t CPUX86Features() const override;
+  virtual uint64_t CPUX86ExtendedFeatures() const override;
+  virtual uint32_t CPUX86Leaf7Features() const override;
+  virtual bool CPUX86SupportsDAZ() const override;
+  virtual OperatingSystem GetOperatingSystem() const override;
+  virtual bool OSServer() const override;
+  virtual void OSVersion(int* major,
+                         int* minor,
+                         int* bugfix,
+                         std::string* build) const override;
+  virtual std::string OSVersionFull() const override;
+  virtual bool NXEnabled() const override;
+  virtual std::string MachineDescription() const override;
+  virtual void TimeZone(DaylightSavingTimeStatus* dst_status,
+                        int* standard_offset_seconds,
+                        int* daylight_offset_seconds,
+                        std::string* standard_name,
+                        std::string* daylight_name) const override;
+
+ private:
+  std::string os_version_full_;
+  std::string os_version_build_;
+  ProcessReader* process_reader_;  // weak
+  const timeval* snapshot_time_;  // weak
+  int os_version_major_;
+  int os_version_minor_;
+  int os_version_bugfix_;
+  bool os_server_;
+  InitializationStateDcheck initialized_;
+
+  DISALLOW_COPY_AND_ASSIGN(SystemSnapshotMac);
+};
+
+}  // namespace internal
+}  // namespace crashpad
+
+#endif  // CRASHPAD_SNAPSHOT_SYSTEM_SNAPSHOT_MAC_H_