win: Implement exception snapshot

snapshot/win/exception_snapshot_win.h

+// Copyright 2015 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_WIN_EXCEPTION_SNAPSHOT_WIN_H_
+#define CRASHPAD_SNAPSHOT_WIN_EXCEPTION_SNAPSHOT_WIN_H_
+
+#include <stdint.h>
+#include <windows.h>
+
+#include "base/basictypes.h"
+#include "build/build_config.h"
+#include "snapshot/cpu_context.h"
+#include "snapshot/exception_snapshot.h"
+#include "util/misc/initialization_state_dcheck.h"
+#include "util/win/address_types.h"
+
+namespace crashpad {
+
+class ProcessReaderWin;
+
+namespace internal {
+
+class ExceptionSnapshotWin final : public ExceptionSnapshot {
+ public:
+  ExceptionSnapshotWin();
+  ~ExceptionSnapshotWin() override;
+
+  //! \brief Initializes the object.
+  //!
+  //! \param[in] process_reader A ProcessReader for the process that sustained
+  //!     the exception.
+  //! \param[in] thread_id The thread ID in which the exception occurred.
+  //! \param[in] exception_pointers_address The address of an
+  //!     `EXCEPTION_POINTERS` record in the target process, passed through from
+  //!     the exception handler.
+  //!
+  //! \return `true` if the snapshot could be created, `false` otherwise with
+  //!     an appropriate message logged.
+  bool Initialize(ProcessReaderWin* process_reader,
+                  DWORD thread_id,
+                  WinVMAddress exception_pointers);
+
+  // ExceptionSnapshot:
+
+  const CPUContext* Context() const override;
+  uint64_t ThreadID() const override;
+  uint32_t Exception() const override;
+  uint32_t ExceptionInfo() const override;
+  uint64_t ExceptionAddress() const override;
+  const std::vector<uint64_t>& Codes() const override;
+
+ private:
+#if defined(ARCH_CPU_X86_FAMILY)
+  union {
+    CPUContextX86 x86;
+    CPUContextX86_64 x86_64;
+  } context_union_;
+#endif
+  CPUContext context_;
+  std::vector<uint64_t> codes_;
+  uint64_t thread_id_;
+  uint64_t exception_address_;
+  uint32_t exception_flags_;
+  DWORD exception_code_;
+  InitializationStateDcheck initialized_;
+
+  DISALLOW_COPY_AND_ASSIGN(ExceptionSnapshotWin);
+};
+
+}  // namespace internal
+}  // namespace crashpad
+
+#endif  // CRASHPAD_SNAPSHOT_WIN_EXCEPTION_SNAPSHOT_WIN_H_