ItaniumRecordLayoutBuilder doesn't take into account Target's alignment

Clang Frontend
1

Hi all,

I’m new to the Clang frontend and most probably miss something. But I’m stuck at the following problem.

I have own DataLayout, where alignment for all types is 256 bits. However, ItaniumRecordLayoutBuilder makes layout(ASTRecordLayout) for structures without taking this into account.

Thus, I got the following assertion failure:

32 != 256
Assertion failed: (TypeSizeInBits == getDataLayout().getTypeAllocSizeInBits(Ty) && "Type size mismatch!"), function ComputeRecordLayout, file /Users/shermike/proj/nilc/clang/lib/CodeGen/CGRecordLayoutBuilder.cpp, line 939

For example, for struct {int n;}, TypeSizeInBits is equal to 32 bits, but should be 256, I guess.

What I’m doing wrong? Maybe I need to implement my own Layout Builder?

2

To make a guess, I would say that the LLVM IR data layout code assumes that alignof(Ty) <= sizeof(Ty).