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llvmjit: Work around bug in LLVM 3.9 causing crashes after 72559438f92.

Andres Freund <andres@anarazel.de>

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Commit: c835c7ffe21dae8233d21c0ad01e3cbbe475082d
Author: Andres Freund <andres@anarazel.de>
Date: 2020-10-16T01:17:01Z
Releases: 12.5 
llvmjit: Work around bug in LLVM 3.9 causing crashes after 72559438f92.

Unfortunately in LLVM 3.9 LLVMGetAttributeCountAtIndex(func, index)
crashes when called with an index that has 0 attributes. Since there's
no way to work around this in the C API, add a small C++ wrapper doing
so.

The only reason this didn't fail before 72559438f92 is that there
always are function attributes...

Author: Andres Freund <andres@anarazel.de>
Discussion: https://postgr.es/m/20201016001254.w2nfj7gd74jmb5in@alap3.anarazel.de
Backpatch: 11-, like 72559438f92

Files

PathChange+/−
src/backend/jit/llvm/llvmjit.c modified +8 −1
src/backend/jit/llvm/llvmjit_wrap.cpp modified +32 −0
src/include/jit/llvmjit.h modified +2 −0

Discussion