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cranelift-wasm: Allow more customization of ref type representations

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* Allow different Cranelift IR types to be used for different Wasm reference
  types.

* Do not assume that all Wasm reference types are always a Cranelift IR
  reference type. For example, `funcref`s might not need GC in some
  implementations, and can therefore be represented with a pointer rather than a
  reference type.
This commit is contained in:
Nick Fitzgerald
2020-06-23 15:19:22 -07:00
parent 28fccaedc4
commit 03165e0cb5
5 changed files with 54 additions and 13 deletions
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6
cranelift/wasm/src/translation_utils.rs
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@@ -143,7 +143,7 @@ pub fn type_to_type<PE: TargetEnvironment + ?Sized>(
wasmparser::Type::F32 => Ok(ir::types::F32),
wasmparser::Type::F64 => Ok(ir::types::F64),
wasmparser::Type::V128 => Ok(ir::types::I8X16),
wasmparser::Type::ExternRef | wasmparser::Type::FuncRef => Ok(environ.reference_type()),
wasmparser::Type::ExternRef | wasmparser::Type::FuncRef => Ok(environ.reference_type(ty)),
ty => Err(wasm_unsupported!("type_to_type: wasm type {:?}", ty)),
}
}
@@ -160,7 +160,7 @@ pub fn tabletype_to_type<PE: TargetEnvironment + ?Sized>(
wasmparser::Type::F32 => Ok(Some(ir::types::F32)),
wasmparser::Type::F64 => Ok(Some(ir::types::F64)),
wasmparser::Type::V128 => Ok(Some(ir::types::I8X16)),
wasmparser::Type::ExternRef => Ok(Some(environ.reference_type())),
wasmparser::Type::ExternRef => Ok(Some(environ.reference_type(ty))),
wasmparser::Type::FuncRef => Ok(None),
ty => Err(wasm_unsupported!(
"tabletype_to_type: table wasm type {:?}",
@@ -216,7 +216,7 @@ pub fn block_with_params<PE: TargetEnvironment + ?Sized>(
builder.append_block_param(block, ir::types::F64);
}
wasmparser::Type::ExternRef | wasmparser::Type::FuncRef => {
builder.append_block_param(block, environ.reference_type());
builder.append_block_param(block, environ.reference_type(*ty));
}
wasmparser::Type::V128 => {
builder.append_block_param(block, ir::types::I8X16);