Debug info support / method for debugging lightbeam needed

[jlb6740]

Hi,

I was looking to debug a trap error while running a benchmark:

error: failed to process main module /home/jlb6740/wasm_files/wasmtime/shootout/strcat2.c.debug.wasm
caused by: Instantiation error: Trap occurred while invoking start function: wasm trap: call stack exhausted, source location: @rep-nop

In doing so I realized I would not be able to step through the code due to supported needed for generating_debug_info.

error: failed to process main module /home/jlb6740/wasm_files/wasmtime/shootout/strcat2.c.debug.wasm
caused by: WebAssembly compilation error: Debug info is not supported with this configuration

This issue is to track that issue, but also to solicit comments on alternative ways of tracking down the trap error I am seeing.

Thanks.

[yurydelendik]

I would be nice to generate at least ModuleAddressMap data.

@jlb6740 did you try removing https://github.com/CraneStation/wasmtime/blob/a3dd4b91e1986d419a97ff708cb34f46a2e502b5/wasmtime-environ/src/lightbeam.rs#L39-L41 and let lightbeam to generate empty ModuleAddressMap ? I wonder if #267 can help here.

[alexcrichton]

Lightbeam was removed in #3390 as explained in RFC 14, so I'm going to close this.