TPEGFX/dump b2g stack

• Dump kernel call stack

 void func()
 {
   dump_stack()
 }

• Dump user-space call stack

 android.mk:
   LOCAL_SHARED_LIBRARIES += libutils
 
 #include <utils/CallStack.h>
 void func()
 {
   ...
   android::CallStack stack;
   stack.update( );
   stack.log("XXX");  // after android 4.4
   stack.dump("XXX"); // before android 4.4
   ...
 }

• The log should like

 D/bignose ( 8131): #01 pc 00c50c53  /system/b2g/libxul.so
 D/bignose ( 8131): #02 pc 00b638e5  /system/b2g/libxul.so
 D/bignose ( 8131): #03 pc 00bbe341  /system/b2g/libxul.so
 ...

• Use addr2line

 cmd:
 cat ~/tmp/stackLog.txt | awk '{print "./prebuilts/gcc/darwin-x86/arm/arm-linux-androideabi-4.8/bin/arm-linux-androideabi-addr2line --demangle -f -e /Users/bignose/work/mozilla/gecko/git/obj/mozilla_central/gecko_obj-nexus5-l/dist/bin/libxul.so " $6}' | bash
 result:
 mozilla::dom::GenericBindingMethod(JSContext*, unsigned int, JS::Value*)
 /Users/bignose/work/mozilla/gecko/git/obj/mozilla_central/gecko_obj-nexus5-l/dom/bindings/../../../../../mozilla_central/dom/bindings/BindingUtils.cpp:2609
 CallJSNative
 /Users/bignose/work/mozilla/gecko/git/obj/mozilla_central/gecko_obj-nexus5-l/js/src/../../../../../mozilla_central/js/src/jscntxtinlines.h:235
 Interpret
 /Users/bignose/work/mozilla/gecko/git/obj/mozilla_central/gecko_obj-nexus5-l/js/src/../../../../../mozilla_central/js/src/vm/Interpreter.cpp:2955
 ...