bjoernager/rust
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Fix pointer value punning.

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Seems this doesn't trigger error on LLVM 15, but let's fix it for better compatibility.
This commit is contained in:
Charles Lew 2022-09-10 19:42:51 +08:00
parent db9d86b58d
commit 1cbbd2aa61
2 changed files with 27 additions and 1 deletions
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7
compiler/rustc_codegen_ssa/src/base.rs
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@ -166,6 +166,11 @@ pub fn unsized_info<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
if let Some(entry_idx) = vptr_entry_idx {
let ptr_ty = cx.type_i8p();
let ptr_align = cx.tcx().data_layout.pointer_align.abi;
let vtable_ptr_ty = cx.scalar_pair_element_backend_type(
cx.layout_of(cx.tcx().mk_mut_ptr(target)),
1,
true,
);
let llvtable = bx.pointercast(old_info, bx.type_ptr_to(ptr_ty));
let gep = bx.inbounds_gep(
ptr_ty,
@ -176,7 +181,7 @@ pub fn unsized_info<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
bx.nonnull_metadata(new_vptr);
// VTable loads are invariant.
bx.set_invariant_load(new_vptr);
new_vptr
bx.pointercast(new_vptr, vtable_ptr_ty)
} else {
old_info
}