Test Case

Any Wasm module.

Steps to Reproduce

    let engine = Engine::default();
    let module = Module::from_file(&engine, "testcase.wasm").unwrap();
    let range = module.image_range();
    let offset = unsafe { range.end.offset_from(range.start) };
    println!("Offset is {offset}");

Expected Results

The documentation for the method says:

Returns the range of bytes in memory where this module’s compilation image resides.

The compilation image for a module contains executable code, data, debug information, etc. This is roughly the same as the Module::serialize but not the exact same.

I was expecting the range to contain the bytes that contain all of the compilation image.

Actual Results

The range contains the bytes for the executable code but no longer includes data, debug information, or any other parts of the compilation image.

The source code for the method appears to only retrieve the text section.

Versions and Environment

Wasmtime version or commit: Wasmtime 40.0.0

Operating system: All

Architecture: All

Extra Info

We're using the image_size API in wasmtime-rb to inform the Ruby garbage collector about the size of the memory used for the anonymous mmap when creating a module.

It looks like the change in implementation was introduced here on line 975.