win: support x64 reading x86 (wow64)

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"
+#include "util/win/process_structs.h"
 
 namespace crashpad {
 
 class ProcessReaderWin;
 
 namespace internal {
 
 class ExceptionSnapshotWin final : public ExceptionSnapshot {
  public:
   ExceptionSnapshotWin();
@@ skipping 17 matching lines @@
   // 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:
-  template <class ExceptionRecordType, class ContextType>
+  template <class ExceptionRecordType,
+            class ExceptionPointersType,
+            class ContextType>
   bool InitializeFromExceptionPointers(
       const ProcessReaderWin& process_reader,
-      const EXCEPTION_POINTERS& exception_pointers,
+      const ExceptionPointersType& exception_pointers,
       ContextType* context_record);
 
+  template <class ContextRecordType>
+  bool CommonX86Initialize(
+      const ProcessReaderWin& process_reader,
+      const process_types::EXCEPTION_POINTERS<
+          process_types::internal::Traits32>& exception_pointers);
+
+  template <class ExceptionPointersType>
+  bool ReadExceptionPointers(const ProcessReaderWin& process_reader,
+                             WinVMAddress exception_pointers_address,
+                             ExceptionPointersType* exception_pointers);
+
 #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_