Move CallStack to libbacktrace.

Fix a small bug in the Printer for strings that didn't properly
prepend the prefix.

(cherry picked from commit 9b0e074c6d38143e01616404a08b0c7aa992f3c3)

Change-Id: I78bfa3f76864c34f33fb439bf20dfc85616f1077

2 files changed, 9 insertions, 32 deletions

diff --git a/include/utils/CallStack.h b/include/utils/CallStack.h
index 2056751..5836037 100644
--- a/include/utils/CallStack.h
+++ b/include/utils/CallStack.h
@@ -18,8 +18,9 @@
 #define ANDROID_CALLSTACK_H
 
 #include <android/log.h>
+#include <backtrace/backtrace.h>
 #include <utils/String8.h>
-#include <corkscrew/backtrace.h>
+#include <utils/Vector.h>
 
 #include <stdint.h>
 #include <sys/types.h>
@@ -31,42 +32,19 @@ class Printer;
 // Collect/print the call stack (function, file, line) traces for a single thread.
 class CallStack {
 public:
-    enum {
-        // Prune the lowest-most stack frames until we have at most MAX_DEPTH.
-        MAX_DEPTH = 31,
-        // Placeholder for specifying the current thread when updating the stack.
-        CURRENT_THREAD = -1,
-    };
-
     // 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,
-            int32_t maxDepth=MAX_DEPTH);
-    // Copy the existing callstack (no other side effects).
-    CallStack(const CallStack& rhs);
+    CallStack(const char* logtag, int32_t ignoreDepth=1);
     ~CallStack();
 
-    // Copy the existing callstack (no other side effects).
-    CallStack& operator = (const CallStack& rhs);
-
-    // Compare call stacks by their backtrace frame memory.
-    bool operator == (const CallStack& rhs) const;
-    bool operator != (const CallStack& rhs) const;
-    bool operator < (const CallStack& rhs) const;
-    bool operator >= (const CallStack& rhs) const;
-    bool operator > (const CallStack& rhs) const;
-    bool operator <= (const CallStack& rhs) const;
-
-    // Get the PC address for the stack frame specified by index.
-    const void* operator [] (int index) const;
-
     // Reset the stack frames (same as creating an empty call stack).
-    void clear();
+    void clear() { mFrameLines.clear(); }
 
     // Immediately collect the stack traces for the specified thread.
-    void update(int32_t ignoreDepth=1, int32_t maxDepth=MAX_DEPTH, pid_t tid=CURRENT_THREAD);
+    // The default is to dump the stack of the current call.
+    void update(int32_t ignoreDepth=1, pid_t tid=BACKTRACE_NO_TID);
 
     // Dump a stack trace to the log using the supplied logtag.
     void log(const char* logtag,
@@ -83,11 +61,10 @@ public:
     void print(Printer& printer) const;
 
     // Get the count of stack frames that are in this call stack.
-    size_t size() const { return mCount; }
+    size_t size() const { return mFrameLines.size(); }
 
 private:
-    size_t mCount;
-    backtrace_frame_t mStack[MAX_DEPTH];
+    Vector<String8> mFrameLines;
 };
 
 }; // namespace android
diff --git a/include/utils/ProcessCallStack.h b/include/utils/ProcessCallStack.h
index 4a86869..32458b8 100644
--- a/include/utils/ProcessCallStack.h
+++ b/include/utils/ProcessCallStack.h
@@ -39,7 +39,7 @@ public:
     ~ProcessCallStack();
 
     // Immediately collect the stack traces for all threads.
-    void update(int32_t maxDepth = CallStack::MAX_DEPTH);
+    void update();
 
     // Print all stack traces to the log using the supplied logtag.
     void log(const char* logtag, android_LogPriority priority = ANDROID_LOG_DEBUG,