Results of wtmaps look odd?

[kripken]

The attached testcase has these files:

• emcc-0-base.wasm - initial wasm file
• emcc-1-wtmaps.map - identity map
• emcc-2-wasm-emscripten-finalize.wasm - output of the binaryen wasm-emscripten-finalize tool
• emcc-3-output_map.map - the output source map from that tool
• emcc-4-wasm-emscripten-finalize.wtmapped.wasm - the modified wasm after wtmaps ran, updating the debug info

The final updated file looks odd to me, but maybe I'm not looking at it right?

Attached is a screenshot that compares the 3 wasm files. The emcc-2 looks basically like emcc-0, which actually is surprising because the files are not identical, so I would have guessed the movement should have broken things? But both look ok, the source code makes sense for the wasm code.

But then emcc-4 looks odd, like something may have gone wrong?

emscripten_temp.zip

edit: to complete the STR, here is the command to get the final wasm from the previous files:

$ wdwarf-cp emcc-0-base.wasm -o out.wasm -m emcc-3-output_map.map -w emcc-2-wasm-emscripten-finalize.wasm