upload android base code part6

android/system/core/libbacktrace/UnwindPtrace.h

@@ -0,0 +1,48 @@
+/*
+ * Copyright (C) 2013 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 _LIBBACKTRACE_UNWIND_PTRACE_H
+#define _LIBBACKTRACE_UNWIND_PTRACE_H
+
+#include <stdint.h>
+#include <sys/types.h>
+
+#include <string>
+
+#ifdef UNW_LOCAL_ONLY
+#undef UNW_LOCAL_ONLY
+#endif
+#include <libunwind.h>
+
+#include "BacktracePtrace.h"
+
+class UnwindPtrace : public BacktracePtrace {
+ public:
+  UnwindPtrace(pid_t pid, pid_t tid, BacktraceMap* map);
+  virtual ~UnwindPtrace();
+
+  bool Unwind(size_t num_ignore_frames, ucontext_t* ucontext) override;
+
+  std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) override;
+
+ private:
+  bool Init();
+
+  unw_addr_space_t addr_space_;
+  struct UPT_info* upt_info_;
+};
+
+#endif // _LIBBACKTRACE_UNWIND_PTRACE_H