How to Print Function Caller Stack in Android Log File

[#1]

Print caller stack may help you to analyze the program and find out the caller stack more easily.

You can write your code like this:

Java:

     Exception e = new Exception();

     Log.e(TAG,"xxx",e);

C++ file:

      #include <utils/Callstack.h>

     android::CallStack stack;

     stack.update(1,30);

     stacn.dump("xxx");

Then you can see the function's caller stack in Android main log file.

C file:

#include <corkscrew/backtrace.h>

#define MAX_DEPTH 31
#define MAX_BACKTRACE_LINE_LENGTH 800

static backtrace_frame_t mStack[MAX_DEPTH];
static size_t mCount;

void csupdate(int32_t ignoreDepth, int32_t maxDepth) {
    if (maxDepth > MAX_DEPTH) {
        maxDepth = MAX_DEPTH;
    }
    ssize_t count = unwind_backtrace(mStack, ignoreDepth + 1, maxDepth);
    mCount = count > 0 ? count : 0;
}

void csdump(const char* prefix)\
{
size_t i = 0;
    backtrace_symbol_t symbols[MAX_DEPTH];

    get_backtrace_symbols(mStack, mCount, symbols);

    for (i = 0; i < mCount; i++) {
        char line[MAX_BACKTRACE_LINE_LENGTH];
        format_backtrace_line(i, &mStack[i], &symbols[i],
                line, MAX_BACKTRACE_LINE_LENGTH);
        ALOGE("%s%s", prefix, line);
    }

    free_backtrace_symbols(symbols, mCount);
}

void myFunc()

{

     csupdate(1, 30);

     csdump("myprefix");

}

In Android.mk, add libcorkscrew, as below

LOCAL_SHARED_LIBRARIES := libxxx libyyy libcorkscrew