Rewrite libbacktrace using C++.
The old code was essentially trying to be C++ in C and was awkward. This
change makes it all objects with a thin layer that C code can use.
There is a C++ backtrace object that is not very useful, this code will
replace it.
This change also includes moving the backtrace test to a gtest, and adding
coverage of all major functionality.
Bug: 8410085
Change-Id: Iae0f1b09b3dd60395f71ed66010c1ea5cdd37841
diff --git a/libbacktrace/Backtrace.h b/libbacktrace/Backtrace.h
new file mode 100644
index 0000000..b89bc89
--- /dev/null
+++ b/libbacktrace/Backtrace.h
@@ -0,0 +1,62 @@
+/*
+ * 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_BACKTRACE_H
+#define _LIBBACKTRACE_BACKTRACE_H
+
+#include <backtrace/Backtrace.h>
+
+#include <sys/types.h>
+
+class BacktraceImpl {
+public:
+ virtual ~BacktraceImpl() { }
+
+ virtual bool Unwind(size_t num_ignore_frames) = 0;
+
+ // The name returned is not demangled, Backtrace::GetFunctionName()
+ // takes care of demangling the name.
+ virtual std::string GetFunctionNameRaw(uintptr_t pc, uintptr_t* offset) = 0;
+
+ void SetParent(Backtrace* backtrace) { backtrace_obj_ = backtrace; }
+
+protected:
+ backtrace_t* GetBacktraceData();
+
+ Backtrace* backtrace_obj_;
+};
+
+class BacktraceCurrent : public Backtrace {
+public:
+ BacktraceCurrent(BacktraceImpl* impl);
+ virtual ~BacktraceCurrent();
+
+ bool ReadWord(uintptr_t ptr, uint32_t* out_value);
+};
+
+class BacktracePtrace : public Backtrace {
+public:
+ BacktracePtrace(BacktraceImpl* impl, pid_t pid, pid_t tid);
+ virtual ~BacktracePtrace();
+
+ bool ReadWord(uintptr_t ptr, uint32_t* out_value);
+};
+
+Backtrace* CreateCurrentObj();
+Backtrace* CreatePtraceObj(pid_t pid, pid_t tid);
+Backtrace* CreateThreadObj(pid_t tid);
+
+#endif // _LIBBACKTRACE_BACKTRACE_H