Reverse sort sourceMap

[ya-mouse]

Do reverse sort of the sourceMap.

In my launch.json configuration I have the following sourceFileMap:

            "sourceFileMap": {
                "/usr/src/debug/my-project/git-r0/build/src/../../git": "${workspaceFolder}",
                "/usr/src/debug": {
                    "editorPath": "${config:YOCTO_ARCH}",
                    "useForBreakpoints": false
                }
            },

The YOCTO_ARCH set in settings.json to:

    "terminal.integrated.env.linux": {
        "YOCTO_ARCH": "/home/mouse/linux-bsp/linux-devel-build/build/work/cortexa7t2hf-neon-vfpv4_linux-linux-gnueabi"
    },

The proposed change addresses an issue encountered while debugging a binary that's running on a remote system and built using Yocto. Currently, when debugging, the source files are being referenced from the Yocto build tree instead of the local workspace. This issue prevents setting breakpoints effectively in the local workspace source files.

To resolve this, the change involves modifying the way source mappings are processed. Specifically, it proposes sorting the mappings in reverse order, starting with the longer, more specific paths and moving towards the more general ones. By doing this, the debugger will first consider the project-specific paths defined in sourceFileMap. If it doesn't find a match there, it will then fall back to the more general paths. This reverse sorting ensures that the local workspace sources are prioritized over the Yocto build tree sources, allowing for effective breakpoint setting and debugging in the local workspace.

[gregg-miskelly]

Aside from that, this change looks good to me. Thanks for taking the time to submit this!

[gregg-miskelly]

Thanks for taking the time to submit this!

[gregg-miskelly]

@WardenGnaw do you want to take a quick look also?