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Auto merge of #24224 - asajeffrey:magicleap-rime-of-the-ancient-debugger, r=jdm
Added description of debugging gstreamer in magicleap <!-- Please describe your changes on the following line: --> A description of the steps needed to debug gstreamer on magicleap. --- <!-- Thank you for contributing to Servo! Please replace each `[ ]` by `[X]` when the step is complete, and replace `___` with appropriate data: --> - [x] `./mach build -d` does not report any errors - [x] `./mach test-tidy` does not report any errors - [x] These changes do not require tests because it's documentation <!-- Also, please make sure that "Allow edits from maintainers" checkbox is checked, so that we can help you if you get stuck somewhere along the way.--> <!-- Pull requests that do not address these steps are welcome, but they will require additional verification as part of the review process. --> <!-- Reviewable:start --> --- This change is [<img src="https://reviewable.io/review_button.svg" height="34" align="absmiddle" alt="Reviewable"/>](https://reviewable.io/reviews/servo/servo/24224) <!-- Reviewable:end -->
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@ -29,3 +29,104 @@ This builds the application `.out/Servo2D/Servo2D.mpk`.
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Alternatively, in Visual Studio code, open the `support/magicleap/Servo2D` directory,
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and use the `Terminal/Run Build Task...` menu option to build the
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Servo2D application.
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## Debugging gstreamer
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By default, Servo links against release builds of gstreamer, even for debug builds,
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so if you want to use gdb on gstreamer, you've got some work to do...
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First off, you'll need to build the gstreamer libraries with debug symbols.
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To do this, edit `support/magicleap/gstreamer/mlsdk.txt.in` and add `'-g', '-O0`,` to
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`c_args` and `cpp_args`:
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```
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[properties]
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c_args = [
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'-g', '-O0',
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'--sysroot=@MAGICLEAP_SDK@/lumin/usr',
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'-I@MAGICLEAP_SDK@/include',
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'-I@MAGICLEAP_SDK@/staging/include',
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'-I@INSTALL_DIR@/system/include',
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]
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cpp_args = [
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'-g', '-O0',
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'--sysroot=@MAGICLEAP_SDK@/lumin/usr',
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'-I@MAGICLEAP_SDK@/include',
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'-I@MAGICLEAP_SDK@/staging/include',
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'-I@INSTALL_DIR@/system/include',
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]
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```
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then build the libraries with `./gstreamer.sh` from inside `support/magicleap/gstreamer`.
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The libraries will be built in `_install/system`, and should be moved over to
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where `mach` expects them to be:
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```
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rm -r target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system
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cp -r support/magicleap/gstreamer/_install/system target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/
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```
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You can now build, package and install as normal:
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```
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./mach build -d --magicleap
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./mach package -d --magicleap
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$MAGICLEAP_SDK/tools/mldb/mldb install -u target/magicleap/aarch64-linux-android/debug/Servo.mpk
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```
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to launch gdb on the application:
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```
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$MAGICLEAP_SDK/debug --package com.mozilla.servo support/magicleap/Servo2D/.out/debug_lumin_clang-3.8_aarch64/Servo2D
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```
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Using the debug libraries in gdb is slightly tricky because you need to set everything up
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in the right order, setting `solib-search-path` should happen before doing any dynamic loading,
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but setting `sysroot` after dynamic loading has started. The easiest thing to do is to place a
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breakpoint somewhere in Servo after gstreamer has started loading, for example:
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```
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(gdb) set solib-search-path /Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib:/Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/
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warning: Unable to find dynamic linker breakpoint function.
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GDB will be unable to debug shared library initializers
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and track explicitly loaded dynamic code.
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(gdb) rbreak RenderAndroid::new
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Breakpoint 1 at 0xaaaac59953a4
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struct Option<servo_media_gstreamer_render_android::RenderAndroid> servo_media_gstreamer_render_android::RenderAndroid::new::he5ddafe679ae0dff(struct Box<PlayerGLContext>);
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Breakpoint 2 at 0xaaaac423f184: file /Users/ajeffrey/github/asajeffrey/media/backends/gstreamer/render-android/lib.rs, line 81.
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static struct Option<gstreamer_gl::auto::gl_display::GLDisplay> servo_media_gstreamer_render_android::RenderAndroid::new::_$u7b$$u7b$closure$u7d$$u7d$::h53b9e99990e38d92(struct closure, struct GLDisplayEGL);
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(gdb) c
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...
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Thread 2 "ScriptThread Pi" hit Breakpoint 1, 0x0000aaaac59953a4 in servo_media_gstreamer_render_android::RenderAndroid::new::he5ddafe679ae0dff
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(app_gl_context=...)
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(gdb) set sysroot /Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin
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warning: .dynamic section for "/Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/libc.so" is not at the expected address (wrong library or version mismatch?)
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warning: .dynamic section for "/Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/liblog.so" is not at the expected address (wrong library or version mismatch?)
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warning: .dynamic section for "/Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/libz.so" is not at the expected address (wrong library or version mismatch?)
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warning: .dynamic section for "/Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/libEGL.so" is not at the expected address (wrong library or version mismatch?)
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warning: .dynamic section for "/Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/libGLESv2.so" is not at the expected address (wrong library or version mismatch?)
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warning: .dynamic section for "/Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/libGLESv3.so" is not at the expected address (wrong library or version mismatch?)
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warning: .dynamic section for "/Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/libm.so" is not at the expected address (wrong library or version mismatch?)
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warning: .dynamic section for "/Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/libvulkan.so" is not at the expected address (wrong library or version mismatch?)
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warning: .dynamic section for "/Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/libstdc++.so" is not at the expected address (wrong library or version mismatch?)
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warning: .dynamic section for "/Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/libGLESv1_CM.so" is not at the expected address (wrong library or version mismatch?)
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warning: Could not load shared library symbols for 191 libraries, e.g. /system/bin/linker64.
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Use the "info sharedlibrary" command to see the complete listing.
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Do you need "set solib-search-path" or "set sysroot"?
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Reading symbols from /Users/ajeffrey/MagicLeap/mlsdk/v0.22.0/lumin/usr/lib/libc.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libglib-2.0.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libgobject-2.0.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libgstreamer-1.0.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libgstapp-1.0.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libgstaudio-1.0.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libgstbase-1.0.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libgstgl-1.0.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libgstplayer-1.0.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libgstsdp-1.0.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libgstvideo-1.0.so...done.
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Reading symbols from /Users/ajeffrey/github/asajeffrey/servo/target/magicleap/aarch64-linux-android/native/gstreamer-1.16.0/system/lib64/libgstwebrtc-1.0.so...done.
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...
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(gdb) break gst_gl_context_activate
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Breakpoint 3 at 0x40003ba0bb98: file ../gst-build/subprojects/gst-plugins-base/gst-libs/gst/gl/gstglcontext.c, line 746.
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```
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At this point, setting breakpoints and step-debugging should work as expected.
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