External DWARF debug info

[rayglover-ibm]

Using this extension I'm trying to debug a wasm binary compiled with external debug info (enabled by the -gseparate-dwarf=<path> and SEPARATE_DWARF_URL options in Emscripten). The only way I've been able to get this to work is by embedding a file: scheme URI to the full path of the dwp file. However this doesn't work with Chrome DevTools and I suspect this is deliberate for security reasons.

Alternative methods I've tried are:

• A relative path to the dwp (works with chrome DevTools)
• A http:// URL to a localhost server serving the dwp (works with chrome DevTools)
• An absolute path

I'd like single approach which works for both the VSCode and Chrome DevTools extensions so the same binary can be debugged in different environments. Is there a way to achieve this?

[rayglover-ibm]

OK, I've done more investigation. While external symbols located at http://localhost aren't loaded by this extension, symbols at http://127.0.0.1 are. Is this possibly a bug?

(Aside: I also hacked the Chrome DWARF DevTools extension manifest.json to allow loading file:/// URIs. This is also a possible bug on their part but that's not relevant here.)