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diff --git a/libunwindstack/include/unwindstack/RegsX86_64.h b/libunwindstack/include/unwindstack/RegsX86_64.h
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+/*
+ * Copyright (C) 2016 The Android Open Source Project
+ *
+ * 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 _LIBUNWINDSTACK_REGS_X86_64_H
+#define _LIBUNWINDSTACK_REGS_X86_64_H
+
+#include <stdint.h>
+
+#include <functional>
+
+#include <unwindstack/Elf.h>
+#include <unwindstack/Regs.h>
+
+namespace unwindstack {
+
+// Forward declarations.
+class Memory;
+struct x86_64_ucontext_t;
+
+class RegsX86_64 : public RegsImpl<uint64_t> {
+ public:
+ RegsX86_64();
+ virtual ~RegsX86_64() = default;
+
+ virtual ArchEnum Arch() override final;
+
+ uint64_t GetAdjustedPc(uint64_t rel_pc, Elf* elf) override;
+
+ void SetFromRaw() override;
+
+ bool SetPcFromReturnAddress(Memory* process_memory) override;
+
+ bool StepIfSignalHandler(uint64_t rel_pc, Elf* elf, Memory* process_memory) override;
+
+ void SetFromUcontext(x86_64_ucontext_t* ucontext);
+
+ virtual void IterateRegisters(std::function<void(const char*, uint64_t)>) override final;
+
+ static Regs* Read(void* data);
+
+ static Regs* CreateFromUcontext(void* ucontext);
+};
+
+} // namespace unwindstack
+
+#endif // _LIBUNWINDSTACK_REGS_X86_64_H