1 files changed, 72 insertions, 0 deletions
diff --git a/libutils/include/utils/CallStack.h b/libutils/include/utils/CallStack.h
new file mode 100644
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+++ b/libutils/include/utils/CallStack.h
@@ -0,0 +1,72 @@
+/*
+ * Copyright (C) 2007 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 ANDROID_CALLSTACK_H
+#define ANDROID_CALLSTACK_H
+
+#include <android/log.h>
+#include <backtrace/backtrace_constants.h>
+#include <utils/String8.h>
+#include <utils/Vector.h>
+
+#include <stdint.h>
+#include <sys/types.h>
+
+namespace android {
+
+class Printer;
+
+// Collect/print the call stack (function, file, line) traces for a single thread.
+class CallStack {
+public:
+    // Create an empty call stack. No-op.
+    CallStack();
+    // Create a callstack with the current thread's stack trace.
+    // Immediately dump it to logcat using the given logtag.
+    CallStack(const char* logtag, int32_t ignoreDepth=1);
+    ~CallStack();
+
+    // Reset the stack frames (same as creating an empty call stack).
+    void clear() { mFrameLines.clear(); }
+
+    // Immediately collect the stack traces for the specified thread.
+    // The default is to dump the stack of the current call.
+    void update(int32_t ignoreDepth=1, pid_t tid=BACKTRACE_CURRENT_THREAD);
+
+    // Dump a stack trace to the log using the supplied logtag.
+    void log(const char* logtag,
+             android_LogPriority priority = ANDROID_LOG_DEBUG,
+             const char* prefix = 0) const;
+
+    // Dump a stack trace to the specified file descriptor.
+    void dump(int fd, int indent = 0, const char* prefix = 0) const;
+
+    // Return a string (possibly very long) containing the complete stack trace.
+    String8 toString(const char* prefix = 0) const;
+
+    // Dump a serialized representation of the stack trace to the specified printer.
+    void print(Printer& printer) const;
+
+    // Get the count of stack frames that are in this call stack.
+    size_t size() const { return mFrameLines.size(); }
+
+private:
+    Vector<String8> mFrameLines;
+};
+
+}; // namespace android
+
+#endif // ANDROID_CALLSTACK_H