Comments (7)
What code gets LLVM to produce the inrange
flag? I was never sure how to trigger it last time I looked at this.
from crucible.
I'm not entirely sure. The file that triggers this is about 1MB of LLVM bitcode from some modern-style C++ source.
from crucible.
For now, I've modified the constant expression translation code to ignore the inrange
flag. This is not completely sound, but allows us to accept more code.
To correctly address this issue would take some additional nontrivial infrastructure to add artificial bounds to pointer values, beyond those corresponding to the bounds of memory objects.
from crucible.
FWIW, I believe this is why this verification is failing: https://github.com/acfoltzer/charm/blob/O2-gep-bug/verify/verify-xoodoo.sh
The default and -O1 versions work fine, but when I try to run -O2 bitcode it produces:
Invalid GEP
getelementptr inbounds <16 x i8>, <16 x i8>* %8, i64 0, i64 0
from crucible.
Oh, that's a pretty odd construct... I can see why we reject it, it doesn't make a lot of sense. Looks like a clang bug to me; either that, or I've misunderstood something about GEPs (always a possibility).
At any rate, I don't think it's related to the inrange
flag.
from crucible.
Ah, right, it's still early enough for me to mix up inrange
and inbounds
.
from crucible.
Is it reasonable for you to produce a complete bitcode file of the example that's causing problems? I find these things are often quite sensitive to the exact compiler and build environment.
from crucible.
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