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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
89 lines
2.1 KiB
LLVM
89 lines
2.1 KiB
LLVM
; RUN: llc < %s -verify-machineinstrs
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; <rdar://problem/9187612>
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target datalayout = "e-p:32:32:32-i1:8:32-i8:8:32-i16:16:32-i32:32:32-i64:32:32-f32:32:32-f64:32:32-v64:64:64-v128:128:128-a0:0:32-n32"
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target triple = "thumbv7-apple-darwin"
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define void @func() unnamed_addr align 2 personality i8* bitcast (i32 (...)* @__gxx_personality_sj0 to i8*) {
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entry:
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br label %for.cond
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for.cond:
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%tmp2 = phi i32 [ 0, %entry ], [ %add, %for.cond.backedge ]
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%cmp = icmp ult i32 %tmp2, 14
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br i1 %cmp, label %for.body, label %for.end
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for.body:
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%add = add i32 %tmp2, 1
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switch i32 %tmp2, label %sw.default [
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i32 0, label %sw.bb
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i32 1, label %sw.bb
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i32 2, label %sw.bb
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i32 4, label %sw.bb
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i32 5, label %sw.bb
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i32 10, label %sw.bb
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]
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sw.bb:
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invoke void @foo()
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to label %invoke.cont17 unwind label %lpad
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invoke.cont17:
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invoke void @foo()
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to label %for.cond.backedge unwind label %lpad26
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for.cond.backedge:
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br label %for.cond
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lpad:
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%exn = landingpad { i8*, i32 }
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catch i8* null
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invoke void @foo()
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to label %eh.resume unwind label %terminate.lpad
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lpad26:
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%exn27 = landingpad { i8*, i32 }
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catch i8* null
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invoke void @foo()
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to label %eh.resume unwind label %terminate.lpad
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sw.default:
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br label %for.cond.backedge
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for.end:
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invoke void @foo()
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to label %call8.i.i.i.noexc unwind label %lpad44
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call8.i.i.i.noexc:
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ret void
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lpad44:
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%exn45 = landingpad { i8*, i32 }
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catch i8* null
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invoke void @foo()
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to label %eh.resume unwind label %terminate.lpad
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eh.resume:
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%exn.slot.0 = phi { i8*, i32 } [ %exn27, %lpad26 ], [ %exn, %lpad ], [ %exn45, %lpad44 ]
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resume { i8*, i32 } %exn.slot.0
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terminate.lpad:
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%exn51 = landingpad { i8*, i32 }
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catch i8* null
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tail call void @_ZSt9terminatev() noreturn nounwind
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unreachable
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}
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declare void @foo()
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declare i32 @__gxx_personality_sj0(...)
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declare void @_Unwind_SjLj_Resume_or_Rethrow(i8*)
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declare void @_ZSt9terminatev()
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!0 = !{!"any pointer", !1}
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!1 = !{!"omnipotent char", !2}
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!2 = !{!"Simple C/C++ TBAA"}
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!3 = !{!"bool", !1}
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!4 = !{!"int", !1}
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