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Auto merge of #108012 - compiler-errors:issue-107999, r=oli-obk

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Don't ICE in `might_permit_raw_init` if reference is polymorphic

Emitting optimized MIR for a polymorphic function may require computing layout of a type that isn't (yet) known. This happens in the instcombine pass, for example. Let's fail gracefully in that condition.

cc `@saethlin`
fixes #107999
This commit is contained in:
bors 2023-02-15 20:56:07 +00:00
commit c5283576ec
11 changed files with 116 additions and 56 deletions
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10
compiler/rustc_codegen_ssa/src/mir/block.rs
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@ -674,8 +674,14 @@ impl<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>> FunctionCx<'a, 'tcx, Bx> {
let layout = bx.layout_of(ty);
let do_panic = match intrinsic {
Inhabited => layout.abi.is_uninhabited(),
ZeroValid => !bx.tcx().permits_zero_init(bx.param_env().and(layout)),
MemUninitializedValid => !bx.tcx().permits_uninit_init(bx.param_env().and(layout)),
ZeroValid => !bx
.tcx()
.permits_zero_init(bx.param_env().and(ty))
.expect("expected to have layout during codegen"),
MemUninitializedValid => !bx
.tcx()
.permits_uninit_init(bx.param_env().and(ty))
.expect("expected to have layout during codegen"),
};
Some(if do_panic {
let msg_str = with_no_visible_paths!({