Add MinidumpThreadWriter, MinidumpThreadListWriter, and their test

minidump/minidump_thread_writer.h

Index: minidump/minidump_thread_writer.h
diff --git a/minidump/minidump_thread_writer.h b/minidump/minidump_thread_writer.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_MINIDUMP_MINIDUMP_THREAD_WRITER_H_
+#define CRASHPAD_MINIDUMP_MINIDUMP_THREAD_WRITER_H_
+
+#include <dbghelp.h>
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <vector>
+
+#include "base/basictypes.h"
+#include "minidump/minidump_stream_writer.h"
+#include "minidump/minidump_writable.h"
+#include "util/file/file_writer.h"
+
+namespace crashpad {
+
+class MinidumpContextWriter;
+class MinidumpMemoryListWriter;
+class MinidumpMemoryWriter;
+
+//! \brief The writer for a MINIDUMP_THREAD object in a minidump file.
+//!
+//! Because MINIDUMP_THREAD objects only appear as elements of
+//! MINIDUMP_THREAD_LIST objects, this class does not write any data on its own.
+//! It makes its MINIDUMP_THREAD data available to its MinidumpThreadListWriter
+//! parent, which writes it as part of a MINIDUMP_THREAD_LIST.
+class MinidumpThreadWriter final : public internal::MinidumpWritable {
+ public:
+  MinidumpThreadWriter();
+  ~MinidumpThreadWriter() {}
+
+  //! \brief Returns a MINIDUMP_THREAD referencing this object’s data.
+  //!
+  //! This method is expected to be called by a MinidumpThreadListWriter in
+  //! order to obtain a MINIDUMP_THREAD to include in its list.
+  //!
+  //! \note Valid in #kStateWritable.
+  const MINIDUMP_THREAD* MinidumpThread() const;
+
+  //! \brief Returns a MinidumpMemoryWriter that will write the memory region
+  //!     corresponding to this object’s stack.
+  //!
+  //! If the thread does not have a stack, or its stack could not be determined,
+  //! this will return NULL.
+  //!
+  //! This method is provided so that MinidumpThreadListWriter can obtain thread
+  //! stack memory regions for the purposes of adding them to a
+  //! MinidumpMemoryListWriter (configured by calling
+  //! MinidumpThreadListWriter::SetMemoryListWriter()) by calling
+  //! MinidumpMemoryListWriter::AddExtraMemory().
+  //!
+  //! \note Valid in any state.
+  MinidumpMemoryWriter* Stack() const { return stack_; }
+
+  //! \brief Arranges for MINIDUMP_THREAD::Stack to point to the MINIDUMP_MEMORY
+  //!     object to be written by \a stack.
+  //!
+  //! \a stack will become a child of this object in the overall tree of
+  //! internal::MinidumpWritable objects.
+  //!
+  //! \note Valid in #kStateMutable.
+  void SetStack(MinidumpMemoryWriter* stack);
+
+  //! \brief Arranges for MINIDUMP_THREAD::ThreadContext to point to the CPU
+  //!     context to be written by \a context.
+  //!
+  //! A context is required in all MINIDUMP_THREAD objects.
+  //!
+  //! \a context will become a child of this object in the overall tree of
+  //! internal::MinidumpWritable objects.
+  //!
+  //! \note Valid in #kStateMutable.
+  void SetContext(MinidumpContextWriter* context);
+
+  //! \brief Sets MINIDUMP_THREAD::ThreadId.
+  void SetThreadID(uint32_t thread_id) { thread_.ThreadId = thread_id; }
+
+  //! \brief Sets MINIDUMP_THREAD::SuspendCount.
+  void SetSuspendCount(uint32_t suspend_count) {
+    thread_.SuspendCount = suspend_count;
+  }
+
+  //! \brief Sets MINIDUMP_THREAD::PriorityClass.
+  void SetPriorityClass(uint32_t priority_class) {
+    thread_.PriorityClass = priority_class;
+  }
+
+  //! \brief Sets MINIDUMP_THREAD::Priority.
+  void SetPriority(uint32_t priority) { thread_.Priority = priority; }
+
+  //! \brief Sets MINIDUMP_THREAD::Teb.
+  void SetTEB(uint64_t teb) { thread_.Teb = teb; }
+
+ protected:
+  // MinidumpWritable:
+  virtual bool Freeze() override;
+  virtual size_t SizeOfObject() override;
+  virtual std::vector<MinidumpWritable*> Children() override;
+  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+
+ private:
+  MINIDUMP_THREAD thread_;
+  MinidumpMemoryWriter* stack_;  // weak
+  MinidumpContextWriter* context_;  // weak
+
+  DISALLOW_COPY_AND_ASSIGN(MinidumpThreadWriter);
+};
+
+//! \brief The writer for a MINIDUMP_THREAD_LIST stream in a minidump file,
+//!     containing a list of MINIDUMP_THREAD objects.
+class MinidumpThreadListWriter final : public internal::MinidumpStreamWriter {
+ public:
+  MinidumpThreadListWriter();
+  ~MinidumpThreadListWriter();
+
+  //! \brief Sets the MinidumpMemoryListWriter that each thread’s stack memory
+  //!     region should be added to as extra memory.
+  //!
+  //! Each MINIDUMP_THREAD object can contain a reference to a
+  //! MinidumpMemoryWriter object that contains a snapshot of its stack memory.
+  //! In the overall tree of internal::MinidumpWritable objects, these
+  //! MinidumpMemoryWriter objects are considered children of their
+  //! MINIDUMP_THREAD, and are referenced by a MINIDUMP_MEMORY_DESCRIPTOR
+  //! contained in the MINIDUMP_THREAD. It is also possible for the same memory
+  //! regions to have MINIDUMP_MEMORY_DESCRIPTOR objects present in a
+  //! MINIDUMP_MEMORY_LIST stream. This is accomplished by calling this method,
+  //! which informs a MinidumpThreadListWriter that it should call
+  //! MinidumpMemoryListWriter::AddExtraMemory() for each extant thread stack
+  //! while the thread is being added in AddThread(). When this is done, the
+  //! MinidumpMemoryListWriter will contain a MINIDUMP_MEMORY_DESCRIPTOR
+  //! pointing to the thread’s stack memory in its MINIDUMP_MEMORY_LIST. Note
+  //! that the actual contents of the memory is only written once, as a child of
+  //! the MinidumpThreadWriter. The MINIDUMP_MEMORY_DESCRIPTOR objects in both
+  //! the MINIDUMP_THREAD and MINIDUMP_MEMORY_LIST will point to the same copy
+  //! of the memory’s contents.
+  //!
+  //! \note This method must be called before AddThread() is called. Threads
+  //!     added by AddThread() prior to this method being called will not have
+  //!     their stacks added to \a memory_list_writer as extra memory.
+  //! \note Valid in #kStateMutable.
+  void SetMemoryListWriter(MinidumpMemoryListWriter* memory_list_writer);
+
+  //! \brief Adds a MinidumpThreadWriter to the MINIDUMP_THREAD_LIST.
+  //!
+  //! \a thread will become a child of this object in the overall tree of
+  //! internal::MinidumpWritable objects.
+  //!
+  //! \note Valid in #kStateMutable.
+  void AddThread(MinidumpThreadWriter* thread);
+
+ protected:
+  // MinidumpWritable:
+  virtual bool Freeze() override;
+  virtual size_t SizeOfObject() override;
+  virtual std::vector<MinidumpWritable*> Children() override;
+  virtual bool WriteObject(FileWriterInterface* file_writer) override;
+
+  // MinidumpStreamWriter:
+  virtual MinidumpStreamType StreamType() const override;
+
+ private:
+  MINIDUMP_THREAD_LIST thread_list_base_;
+  std::vector<MinidumpThreadWriter*> threads_;  // weak
+  MinidumpMemoryListWriter* memory_list_writer_;  // weak
+
+  DISALLOW_COPY_AND_ASSIGN(MinidumpThreadListWriter);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_MINIDUMP_MINIDUMP_THREAD_WRITER_H_