Hello Jakob, Here is a workflow that enables debugging in vscode on macOS/Arm using the CodeLLDB debugger:
The gn clean command removes all files and directories except for build.ninja, build.ninja.d and args.gn ``` $ cd v8 $ gn clean out/arm64.debug ``` To ensure the `args.gn` file is present, write it like so to ensure debugging is enabled. ``` $ cat << EOF > out/arm64.debug/args.gn is_debug=true enable_dsyms=true v8_optimized_debug=false target_cpu="arm64" v8_target_cpu="arm64" is_component_build=true EOF ``` Generate ninja build files. ``` $ gn -v gen out/arm64.debug ``` Spot check that it has one of our settings. Note, this is an override from default setting of false. (I don't know how but I would like to be able to verify all settings with one command.) ``` $ gn args out/arm64.debug --list=enable_dsyms ``` Proceed with build. ``` $ ninja -v -C out/arm64.debug ``` Thanks again Jakob for pointing out the v8_optimized_debug setting. That disabled optimization (-O0) and prompted me to find the enable_dsyms setting. On Wednesday, July 10, 2024 at 2:30:16 PM UTC-4 John Davis wrote: > Hello Jakob, > > Many thanks. I haven't yet read the workflow you referenced. I will > though. > > Regarding the quick try of adding `v8_optimized_debug = false` to my gn > gen line - that did not help. ie.: > > `gn -v gen out/arm64.debug --args='is_debug=true target_cpu="arm64" > v8_target_cpu="arm64" is_component_build=true v8_optimized_debug=false'` > > > > On Wednesday, July 10, 2024 at 5:22:53 AM UTC-4 Jakob Kummerow wrote: > >> You may be missing the v8_optimized_debug = false build flag. >> Debug symbols are controlled by the symbol_level flag, which should >> default to 2 in debug builds, but it might help to manually set that. FWIW, >> on Linux I get 2640 for nm -a out/x64.debug/libv8_libplatform.so | wc -l. >> >> I recommend using the recommended building workflow >> <https://v8.dev/docs/build-gn#gm>. In short, tools/dev/gm.py arm64.debug >> should give you reasonable default settings for debugging (if args.gn >> doesn't exist yet; if it does exist, it intentionally leaves it alone). >> >> >> On Tue, Jul 9, 2024 at 6:02 PM 'John Davis' via v8-users < >> v8-u...@googlegroups.com> wrote: >> >>> Hello >>> >>> I'm building v8 on macOS with debugging symbols. (`gn gen ... >>> is_debug=true`) I see the compile command line to include -g2 >>> -dwarf-aranges, -D_DEBUG, -DDEBUG. I've compared the `nm` and `nm -a` >>> output with and without debug switch. >>> >>> ``` >>> $ ls -lh out/arm64.release/d8 >>> 543K Jul 2 15:37 out/arm64.release/d8* >>> $ ls -lh out/arm64.debug/d8 >>> 679K Jul 3 12:32 out/arm64.debug/d8* >>> $ nm -a out/arm64.release/libv8_libplatform.dylib | wc -l >>> 938 >>> $ nm out/arm64.release/libv8_libplatform.dylib | wc -l >>> 404 >>> $ nm -a out/arm64.debug/libv8_libplatform.dylib | wc -l >>> 1130 >>> $ nm out/arm64.debug/libv8_libplatform.dylib | wc -l >>> ``` >>> >>> It appears debug symbols are present. However, when I try to run the >>> debugger with the CodeLLDB extension for vscode, I can not hit any >>> breakpoints. If I build simple C++ apps with a combined compile/link I can >>> hit breakpoints using this method. >>> >>> launch.json: >>> ``` >>> { >>> "version": "0.2.0", >>> "configurations": [ >>> { >>> "name": "clang++ - Debug exe", >>> "type": "lldb", >>> "request": "launch", >>> "program": "${workspaceFolder}/v8/out/arm64.debug/d8", >>> "args": [ >>> "${workspaceFolder}/data/foo.js" >>> ], >>> "cwd": "${workspaceFolder}/v8/out/arm64.debug", >>> "stopOnEntry": false, >>> } >>> ] >>> } >>> ``` >>> >>> Any pointers on how to debug v8 code on macOS? >>> >>> This electronic communication and the information and any files >>> transmitted with it, or attached to it, are confidential and are intended >>> solely for the use of the individual or entity to whom it is addressed and >>> may contain information that is confidential, legally privileged, protected >>> by privacy laws, or otherwise restricted from disclosure to anyone else. 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