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third_party/crashpad/crashpad/minidump/minidump_context_writer.h

Index: third_party/crashpad/crashpad/minidump/minidump_context_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_CONTEXT_WRITER_H_
+#define CRASHPAD_MINIDUMP_MINIDUMP_CONTEXT_WRITER_H_
+
+#include <sys/types.h>
+
+#include "base/basictypes.h"
+#include "base/memory/scoped_ptr.h"
+#include "minidump/minidump_context.h"
+#include "minidump/minidump_writable.h"
+
+namespace crashpad {
+
+struct CPUContext;
+struct CPUContextX86;
+struct CPUContextX86_64;
+
+//! \brief The base class for writers of CPU context structures in minidump
+//!     files.
+class MinidumpContextWriter : public internal::MinidumpWritable {
+ public:
+  ~MinidumpContextWriter() override;
+
+  //! \brief Creates a MinidumpContextWriter based on \a context_snapshot.
+  //!
+  //! \param[in] context_snapshot The context snapshot to use as source data.
+  //!
+  //! \return A MinidumpContextWriter subclass, such as MinidumpContextWriterX86
+  //!     or MinidumpContextWriterAMD64, appropriate to the CPU type of \a
+  //!     context_snapshot. The returned object is initialized using the source
+  //!     data in \a context_snapshot. If \a context_snapshot is an unknown CPU
+  //!     type’s context, logs a message and returns `nullptr`.
+  static scoped_ptr<MinidumpContextWriter> CreateFromSnapshot(
+      const CPUContext* context_snapshot);
+
+ protected:
+  MinidumpContextWriter() : MinidumpWritable() {}
+
+  //! \brief Returns the size of the context structure that this object will
+  //!     write.
+  //!
+  //! \note This method will only be called in #kStateFrozen or a subsequent
+  //!     state.
+  virtual size_t ContextSize() const = 0;
+
+  // MinidumpWritable:
+  size_t SizeOfObject() final;
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(MinidumpContextWriter);
+};
+
+//! \brief The writer for a MinidumpContextX86 structure in a minidump file.
+class MinidumpContextX86Writer final : public MinidumpContextWriter {
+ public:
+  MinidumpContextX86Writer();
+  ~MinidumpContextX86Writer() override;
+
+  //! \brief Initializes the MinidumpContextX86 based on \a context_snapshot.
+  //!
+  //! \param[in] context_snapshot The context snapshot to use as source data.
+  //!
+  //! \note Valid in #kStateMutable. No mutation of context() may be done before
+  //!     calling this method, and it is not normally necessary to alter
+  //!     context() after calling this method.
+  void InitializeFromSnapshot(const CPUContextX86* context_snapshot);
+
+  //! \brief Returns a pointer to the context structure that this object will
+  //!     write.
+  //!
+  //! \attention This returns a non-`const` pointer to this object’s private
+  //!     data so that a caller can populate the context structure directly.
+  //!     This is done because providing setter interfaces to each field in the
+  //!     context structure would be unwieldy and cumbersome. Care must be taken
+  //!     to populate the context structure correctly. The context structure
+  //!     must only be modified while this object is in the #kStateMutable
+  //!     state.
+  MinidumpContextX86* context() { return &context_; }
+
+ protected:
+  // MinidumpWritable:
+  bool WriteObject(FileWriterInterface* file_writer) override;
+
+  // MinidumpContextWriter:
+  size_t ContextSize() const override;
+
+ private:
+  MinidumpContextX86 context_;
+
+  DISALLOW_COPY_AND_ASSIGN(MinidumpContextX86Writer);
+};
+
+//! \brief The writer for a MinidumpContextAMD64 structure in a minidump file.
+class MinidumpContextAMD64Writer final : public MinidumpContextWriter {
+ public:
+  MinidumpContextAMD64Writer();
+  ~MinidumpContextAMD64Writer() override;
+
+  //! \brief Initializes the MinidumpContextAMD64 based on \a context_snapshot.
+  //!
+  //! \param[in] context_snapshot The context snapshot to use as source data.
+  //!
+  //! \note Valid in #kStateMutable. No mutation of context() may be done before
+  //!     calling this method, and it is not normally necessary to alter
+  //!     context() after calling this method.
+  void InitializeFromSnapshot(const CPUContextX86_64* context_snapshot);
+
+  //! \brief Returns a pointer to the context structure that this object will
+  //!     write.
+  //!
+  //! \attention This returns a non-`const` pointer to this object’s private
+  //!     data so that a caller can populate the context structure directly.
+  //!     This is done because providing setter interfaces to each field in the
+  //!     context structure would be unwieldy and cumbersome. Care must be taken
+  //!     to populate the context structure correctly. The context structure
+  //!     must only be modified while this object is in the #kStateMutable
+  //!     state.
+  MinidumpContextAMD64* context() { return &context_; }
+
+ protected:
+  // MinidumpWritable:
+  size_t Alignment() override;
+  bool WriteObject(FileWriterInterface* file_writer) override;
+
+  // MinidumpContextWriter:
+  size_t ContextSize() const override;
+
+ private:
+  MinidumpContextAMD64 context_;
+
+  DISALLOW_COPY_AND_ASSIGN(MinidumpContextAMD64Writer);
+};
+
+}  // namespace crashpad
+
+#endif  // CRASHPAD_MINIDUMP_MINIDUMP_CONTEXT_WRITER_H_