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a0e8011216
Summary:
This change adds some verification in the IR verifier around struct path
TBAA metadata.
Other than some basic sanity checks (e.g. we get constant integers where
we expect constant integers), this checks:
- That by the time an struct access tuple `(base-type, offset)` is
"reduced" to a scalar base type, the offset is `0`. For instance, in
C++ you can't start from, say `("struct-a", 16)`, and end up with
`("int", 4)` -- by the time the base type is `"int"`, the offset
better be zero. In particular, a variant of this invariant is needed
for `llvm::getMostGenericTBAA` to be correct.
- That there are no cycles in a struct path.
- That struct type nodes have their offsets listed in an ascending
order.
- That when generating the struct access path, you eventually reach the
access type listed in the tbaa tag node.
Reviewers: dexonsmith, chandlerc, reames, mehdi_amini, manmanren
Subscribers: mcrosier, llvm-commits
Differential Revision: https://reviews.llvm.org/D26438
llvm-svn: 289402
40 lines
1.0 KiB
LLVM
40 lines
1.0 KiB
LLVM
; RUN: opt < %s -tbaa -licm -S | FileCheck %s
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; PR9634
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@g_58 = common global i32 0, align 4
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@g_116 = common global i32* null, align 8
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define void @f() nounwind {
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; CHECK: entry:
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; CHECK: alloca [9 x i16]
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; CHECK: load i32, i32* @g_58
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; CHECK: br label %for.body
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entry:
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%l_87.i = alloca [9 x i16], align 16
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br label %for.body
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for.body: ; preds = %entry, %for.inc
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%inc12 = phi i32 [ 0, %entry ], [ %inc, %for.body ]
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store i32* @g_58, i32** @g_116, align 8, !tbaa !0
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%tmp2 = load i32*, i32** @g_116, align 8, !tbaa !0
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%tmp3 = load i32, i32* %tmp2, !tbaa !4
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%or = or i32 %tmp3, 10
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store i32 %or, i32* %tmp2, !tbaa !4
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%inc = add nsw i32 %inc12, 1
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%cmp = icmp slt i32 %inc, 4
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br i1 %cmp, label %for.body, label %for.end
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for.end: ; preds = %for.inc
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ret void
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}
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!0 = !{!5, !5, i64 0}
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!1 = !{!"omnipotent char", !2}
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!2 = !{!"Simple C/C++ TBAA"}
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!3 = !{!"short", !1}
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!4 = !{!6, !6, i64 0}
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!5 = !{!"any pointer", !1}
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!6 = !{!"int", !1}
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