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third_party/crashpad/crashpad/snapshot/mac/process_reader.h

Index: third_party/crashpad/crashpad/snapshot/mac/process_reader.h
diff --git a/third_party/crashpad/crashpad/snapshot/mac/process_reader.h b/third_party/crashpad/crashpad/snapshot/mac/process_reader.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_MAC_PROCESS_READER_H_
+#define CRASHPAD_SNAPSHOT_MAC_PROCESS_READER_H_
+
+#include <mach/mach.h>
+#include <sys/time.h>
+#include <sys/types.h>
+#include <time.h>
+
+#include <string>
+#include <vector>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "build/build_config.h"
+#include "util/mach/task_memory.h"
+#include "util/misc/initialization_state_dcheck.h"
+#include "util/posix/process_info.h"
+#include "util/stdlib/pointer_container.h"
+
+namespace crashpad {
+
+class MachOImageReader;
+
+//! \brief Accesses information about another process, identified by a Mach
+//!     task.
+class ProcessReader {
+ public:
+  //! \brief Contains information about a thread that belongs to a task
+  //!     (process).
+  struct Thread {
+#if defined(ARCH_CPU_X86_FAMILY)
+    union ThreadContext {
+      x86_thread_state64_t t64;
+      x86_thread_state32_t t32;
+    };
+    union FloatContext {
+      x86_float_state64_t f64;
+      x86_float_state32_t f32;
+    };
+    union DebugContext {
+      x86_debug_state64_t d64;
+      x86_debug_state32_t d32;
+    };
+#endif
+
+    Thread();
+    ~Thread() {}
+
+    ThreadContext thread_context;
+    FloatContext float_context;
+    DebugContext debug_context;
+    uint64_t id;
+    mach_vm_address_t stack_region_address;
+    mach_vm_size_t stack_region_size;
+    mach_vm_address_t thread_specific_data_address;
+    thread_t port;
+    int suspend_count;
+    int priority;
+  };
+
+  //! \brief Contains information about a module loaded into a process.
+  struct Module {
+    Module();
+    ~Module();
+
+    //! \brief The pathname used to load the module from disk.
+    std::string name;
+
+    //! \brief An image reader for the module.
+    //!
+    //! The lifetime of this MachOImageReader is scoped to the lifetime of the
+    //! ProcessReader that created it.
+    //!
+    //! This field may be `nullptr` if a reader could not be created for the
+    //! module.
+    const MachOImageReader* reader;
+
+    //! \brief The module’s timestamp.
+    //!
+    //! This field will be `0` if its value cannot be determined. It can only be
+    //! determined for images that are loaded by dyld, so it will be `0` for the
+    //! main executable and for dyld itself.
+    time_t timestamp;
+  };
+
+  ProcessReader();
+  ~ProcessReader();
+
+  //! \brief Initializes this object. This method must be called before any
+  //!     other.
+  //!
+  //! \param[in] task A send right to the target task’s task port. This object
+  //!     does not take ownership of the send right.
+  //!
+  //! \return `true` on success, indicating that this object will respond
+  //!     validly to further method calls. `false` on failure. On failure, no
+  //!     further method calls should be made.
+  bool Initialize(task_t task);
+
+  //! \return `true` if the target task is a 64-bit process.
+  bool Is64Bit() const { return is_64_bit_; }
+
+  //! \return The target task’s process ID.
+  pid_t ProcessID() const { return process_info_.ProcessID(); }
+
+  //! \return The target task’s parent process ID.
+  pid_t ParentProcessID() const { return process_info_.ParentProcessID(); }
+
+  //! \brief Determines the target process’ start time.
+  //!
+  //! \param[out] start_time The time that the process started.
+  void StartTime(timeval* start_time) const {
+    process_info_.StartTime(start_time);
+  }
+
+  //! \brief Determines the target process’ execution time.
+  //!
+  //! \param[out] user_time The amount of time the process has executed code in
+  //!     user mode.
+  //! \param[out] system_time The amount of time the process has executed code
+  //!     in system mode.
+  //!
+  //! \return `true` on success, `false` on failure, with a warning logged. On
+  //!     failure, \a user_time and \a system_time will be set to represent no
+  //!     time spent executing code in user or system mode.
+  bool CPUTimes(timeval* user_time, timeval* system_time) const;
+
+  //! \return Accesses the memory of the target task.
+  TaskMemory* Memory() { return task_memory_.get(); }
+
+  //! \return The threads that are in the task (process). The first element (at
+  //!     index `0`) corresponds to the main thread.
+  const std::vector<Thread>& Threads();
+
+  //! \return The modules loaded in the process. The first element (at index
+  //!     `0`) corresponds to the main executable, and the final element
+  //!     corresponds to the dynamic loader, dyld.
+  const std::vector<Module>& Modules();
+
+ private:
+  //! Performs lazy initialization of the \a threads_ vector on behalf of
+  //! Threads().
+  void InitializeThreads();
+
+  //! Performs lazy initialization of the \a modules_ vector on behalf of
+  //! Modules().
+  void InitializeModules();
+
+  //! \brief Calculates the base address and size of the region used as a
+  //!     thread’s stack.
+  //!
+  //! The region returned by this method may be formed by merging multiple
+  //! adjacent regions in a process’ memory map if appropriate. The base address
+  //! of the returned region may be lower than the \a stack_pointer passed in
+  //! when the ABI mandates a red zone below the stack pointer.
+  //!
+  //! \param[in] stack_pointer The stack pointer, referring to the top (lowest
+  //!     address) of a thread’s stack.
+  //! \param[out] stack_region_size The size of the memory region used as the
+  //!     thread’s stack.
+  //!
+  //! \return The base address (lowest address) of the memory region used as the
+  //!     thread’s stack.
+  mach_vm_address_t CalculateStackRegion(mach_vm_address_t stack_pointer,
+                                         mach_vm_size_t* stack_region_size);
+
+  //! \brief Adjusts the region for the red zone, if the ABI requires one.
+  //!
+  //! This method performs red zone calculation for CalculateStackRegion(). Its
+  //! parameters are local variables used within that method, and may be
+  //! modified as needed.
+  //!
+  //! Where a red zone is required, the region of memory captured for a thread’s
+  //! stack will be extended to include the red zone below the stack pointer,
+  //! provided that such memory is mapped, readable, and has the correct user
+  //! tag value. If these conditions cannot be met fully, as much of the red
+  //! zone will be captured as is possible while meeting these conditions.
+  //!
+  //! \param[inout] start_address The base address of the region to begin
+  //!     capturing stack memory from. On entry, \a start_address is the stack
+  //!     pointer. On return, \a start_address may be decreased to encompass a
+  //!     red zone.
+  //! \param[inout] region_base The base address of the region that contains
+  //!     stack memory. This is distinct from \a start_address in that \a
+  //!     region_base will be page-aligned. On entry, \a region_base is the
+  //!     base address of a region that contains \a start_address. On return,
+  //!     if \a start_address is decremented and is outside of the region
+  //!     originally described by \a region_base, \a region_base will also be
+  //!     decremented appropriately.
+  //! \param[inout] region_size The size of the region that contains stack
+  //!     memory. This region begins at \a region_base. On return, if \a
+  //!     region_base is decremented, \a region_size will be incremented
+  //!     appropriately.
+  //! \param[in] user_tag The Mach VM system’s user tag for the region described
+  //!     by the initial values of \a region_base and \a region_size. The red
+  //!     zone will only be allowed to extend out of the region described by
+  //!     these initial values if the user tag is appropriate for stack memory
+  //!     and the expanded region has the same user tag value.
+  void LocateRedZone(mach_vm_address_t* start_address,
+                     mach_vm_address_t* region_base,
+                     mach_vm_address_t* region_size,
+                     unsigned int user_tag);
+
+  ProcessInfo process_info_;
+  std::vector<Thread> threads_;  // owns send rights
+  std::vector<Module> modules_;
+  PointerVector<MachOImageReader> module_readers_;
+  scoped_ptr<TaskMemory> task_memory_;
+  task_t task_;  // weak
+  InitializationStateDcheck initialized_;
+
+  // This shadows a method of process_info_, but it’s accessed so frequently
+  // that it’s given a first-class field to save a call and a few bit operations
+  // on each access.
+  bool is_64_bit_;
+
+  bool initialized_threads_;
+  bool initialized_modules_;
+
+  DISALLOW_COPY_AND_ASSIGN(ProcessReader);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_SNAPSHOT_MAC_PROCESS_READER_H_