73fddc3f8d
The current build of wasmtime on aarch64 panics immediately because the debug infrastructure constructs an address-to-instruction map unconditionally now, and the new backend does not yet support debug info generally (#1523). In this particular case, the address-map construction consults the encoding info, which is not implemented by the new backend and causes the panic. This fix simply avoids generating per-instruction entries in the address map; it at least gets us going until we plumb SourceLocs all the way through the new pipeline.
This is the wasmtime-environ crate, which contains the implementations
of the ModuleEnvironment and FuncEnvironment traits from
cranelift-wasm. They effectively
implement an ABI for basic wasm compilation that defines how linear memories
are allocated, how indirect calls work, and other details. They can be used
for JITing, native object files, or other purposes.