Debug JNI code with ndk-gdb and eclipse GUI
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This document provides instructions for debugging JNI code with ndk-gdb and the Eclipse IDE. It outlines prerequisites like building a debuggable JNI library and setting up a Cygwin environment. It then explains how to use ndk-gdb to debug from the command line, and modifies scripts and Eclipse configurations to enable debugging JNI code directly within Eclipse.
Debug JNI code with ndk-gdb and eclipse GUI
- 1. Debug JNI code with ndk-gdb and eclipse GUI Tom Chen
- 2. Overview ● Prerequisite ● Debug with ndk-gdb ● Set up eclipse gdb environment ● Debug JNI in eclipse
- 3. Prerequisite Build Debuggable JNI Lib ● Download android-ndk-r9 ● In AndroidManifest.xml ● android:debuggable=true ● In Application.mk, APP_OPTIM := debug. ● Without this variable is also fine. Just don't let it be "release". ● Build Code: ndk-build NDK_DEBUG=1
- 4. Prerequisite Cygwin Environment ● Download and install cygwin ● Remember to install make(2.7 or higher) ● Install JDK and set up env variables, PATH and CLASSPATH ● Without JDK is also fine, but have to run ndk-gdb with "--nowait". ● Set up path to android-sdk and ndk in PATH env variables. ● For unix-like env, just set up these relative paths.
- 5. Debug with ndk-gdb Steps ● First, run your debuggle app directly or via eclipse. ● Open cygwin and go to where your project resides. ● Execute ndk-gdb ● With --nowait specified if no JDK installed. ● Set up some break points and start debugging!
- 6. Debug with ndk-gdb Basic gdb commands ● break (br or b): Setup break points ● info br: Show all break points ● bt: Display call stack ● list: Show next ten lines of code ● print (p): Print the content of variable ● continue (c): Continue the process. ● step (s): Step to next line
- 7. Set up eclipse gdb ● CDT plugin is required! ● Create C/C++ debug configuration.
- 9. {ndk path}toolchainsarm-linux-androideabi-4.6prebuiltwindows- x86_64binarm-linux-androideabi-gdb.exe
- 11. Set up eclipse gdb Modify scripts ● ndk-gdb ● Make a copy and rename it as ndk-gdb-eclipse ● Edit the new file and comment out the last line – #$GDBCLIENT -x `native_path $GDBSETUP` ● gdb.setup ● The file located at objlocalarmeabigdb.setup . ● Make a copy named gdb2.setup ● Delete the last line – target remote :5039
- 12. Debug JNI in eclipse ● First, run your debuggle app directly or via eclipse ● Open cygwin and go to where your project resides. ● Execute ndk-gdb-eclipse ● With --nowait specified if no JDK installed. ● Wait until the command finish ● Go back to eclipse and execute the debug configuration just created!