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Prepare inbounds_gep for opaque pointers

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Implement inbounds_gep using LLVMBuildInBoundsGEP2 which takes an
explicit type argument instead of deriving it from a pointer type.
This commit is contained in:
Tomasz Miąsko 2021-08-01 00:00:00 +00:00
parent 4013e094f5
commit 77e5e17231
11 changed files with 61 additions and 22 deletions
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7
compiler/rustc_codegen_ssa/src/base.rs
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@ -168,8 +168,11 @@ pub fn unsized_info<'a, 'tcx, Bx: BuilderMethods<'a, 'tcx>>(
let ptr_ty = cx.type_i8p();
let ptr_align = cx.tcx().data_layout.pointer_align.abi;
let llvtable = bx.pointercast(old_info, bx.type_ptr_to(ptr_ty));
let gep =
bx.inbounds_gep(llvtable, &[bx.const_usize(u64::try_from(entry_idx).unwrap())]);
let gep = bx.inbounds_gep(
ptr_ty,
llvtable,
&[bx.const_usize(u64::try_from(entry_idx).unwrap())],
);
let new_vptr = bx.load(ptr_ty, gep, ptr_align);
bx.nonnull_metadata(new_vptr);
// Vtable loads are invariant.