https://llvm.org/bugs/show_bug.cgi?id=30681
Bug ID: 30681
Summary: [crash] add-discriminators pass handles inlined
locations incorrectly
Product: libraries
Version: trunk
Hardware: All
OS: All
Status: NEW
Severity: normal
Priority: P
Component: Transformation Utilities
Assignee: unassignedb...@nondot.org
Reporter: apra...@apple.com
CC: llvm-bugs@lists.llvm.org
Classification: Unclassified
Created attachment 17430
--> https://llvm.org/bugs/attachment.cgi?id=17430&action=edit
t.ll
In the following example the add-discriminators pass is incorrectly setting the
scope of a non-inlined instruction (br) to the scope of its inlined predecessor
(%call.i).
This causes the LLVM Verifier to fail and assertions to fire.
To reproduce run:
clang-4.0 -cc1 -emit-obj -disable-llvm-optzns t.ll -o /dev/null -mllvm
-debug-only=add-discriminators
warning: overriding the module target triple with x86_64-apple-darwin16.1.0
t.c:1:27:1 %call.i = tail call i8* @__memset_chk(i8* null, i32 0, i64 0, i64
%0) #2, !dbg !19
t.c:1:9:1 br label %for.cond, !dbg !21, !llvm.loop !22
!dbg attachment points at wrong subprogram for function
!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8,
isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0,
variables: !2)
i32 ()* @f
br label %for.cond, !dbg !21, !llvm.loop !22
!21 = !DILocation(line: 1, column: 9, scope: !20)
!20 = !DILexicalBlockFile(scope: !12, file: !1, discriminator: 1)
!12 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 1, type: !8,
isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0,
variables: !2)
!dbg attachment points at wrong subprogram for function
!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8,
isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0,
variables: !2)
i32 ()* @f
br label %for.cond, !dbg !21, !llvm.loop !22
!21 = !DILocation(line: 1, column: 9, scope: !20)
!20 = !DILexicalBlockFile(scope: !12, file: !1, discriminator: 1)
!12 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 1, type: !8,
isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0,
variables: !2)
Assertion failed: (cast<DISubprogram>(Scope)->describes(MF->getFunction())),
function getOrCreateRegularScope, file ../lib/CodeGen/LexicalScopes.cpp, line
159.
Stack dump:
0. Program arguments:
/Volumes/Fusion/Data/llvm/_build.ninja.release/bin/clang-4.0 -cc1 -emit-obj
-disable-llvm-optzns t.ll -o /dev/null -mllvm -debug-only=add-discriminators
1. Code generation
2. Running pass 'Function Pass Manager' on module 't.ll'.
3. Running pass 'Live DEBUG_VALUE analysis' on function '@f'
Abort trap: 6
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