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644f06ec1f
Replace ad-hoc ABI "adjustments" with an `AbiMap` to `CanonAbi`
Our `conv_from_spec_abi`, `adjust_abi`, and `is_abi_supported` combine to give us a very confusing way of reasoning about what _actual_ calling convention we want to lower our code to and whether we want to compile the resulting code at all. Instead of leaving this code as a miniature adventure game in which someone tries to combine stateful mutations into a Rube Goldberg machine that will let them escape the maze and arrive at the promised land of codegen, we let `AbiMap` devour this complexity. Once you have an `AbiMap`, you can answer which `ExternAbi`s will lower to what `CanonAbi`s (and whether they will lower at all).
Removed:
- `conv_from_spec_abi` replaced by `AbiMap::canonize_abi`
- `adjust_abi` replaced by same
- `Conv::PreserveAll` as unused
- `Conv::Cold` as unused
- `enum Conv` replaced by `enum CanonAbi`
target-spec.json changes:
- If you have a target-spec.json then now your "entry-abi" key will be specified in terms of one of the `"{abi}"` strings Rust recognizes, e.g.
```json
"entry-abi": "C",
"entry-abi": "win64",
"entry-abi": "aapcs",
```
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| .. | ||
| abi | ||
| debuginfo | ||
| driver | ||
| intrinsics | ||
| optimize | ||
| allocator.rs | ||
| analyze.rs | ||
| base.rs | ||
| cast.rs | ||
| codegen_f16_f128.rs | ||
| codegen_i128.rs | ||
| common.rs | ||
| compiler_builtins.rs | ||
| concurrency_limiter.rs | ||
| config.rs | ||
| constant.rs | ||
| discriminant.rs | ||
| global_asm.rs | ||
| inline_asm.rs | ||
| lib.rs | ||
| linkage.rs | ||
| main_shim.rs | ||
| num.rs | ||
| pointer.rs | ||
| pretty_clif.rs | ||
| toolchain.rs | ||
| unsize.rs | ||
| unwind_module.rs | ||
| value_and_place.rs | ||
| vtable.rs | ||