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Have stripDebugInfo() also strip !llvm.loop annotations from all 

instructions.

The !llvm.loop annotations consist of pointers into the debug info, so
when stripping the debug info (particularly important when it is
malformed!) !llvm.loop annotations need to be stripped as well, or
else the malformed debug info stays around.  This patch applies the
stripping to all instructions, not just terminator instructions.

rdar://73687049

Differential Revision: https://reviews.llvm.org/D96181
This commit is contained in:
Adrian Prantl 2021-02-05 14:18:13 -08:00
parent 9179764710
commit 79f46a30c2
2 changed files with 28 additions and 12 deletions
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19
llvm/lib/IR/DebugInfo.cpp
View File

@ -338,18 +338,13 @@ bool llvm::stripDebugInfo(Function &F) {
Changed = true;
I.setDebugLoc(DebugLoc());
}
}
auto *TermInst = BB.getTerminator();
if (!TermInst)
// This is invalid IR, but we may not have run the verifier yet
continue;
if (auto *LoopID = TermInst->getMetadata(LLVMContext::MD_loop)) {
auto *NewLoopID = LoopIDsMap.lookup(LoopID);
if (!NewLoopID)
NewLoopID = LoopIDsMap[LoopID] = stripDebugLocFromLoopID(LoopID);
if (NewLoopID != LoopID)
TermInst->setMetadata(LLVMContext::MD_loop, NewLoopID);
if (auto *LoopID = I.getMetadata(LLVMContext::MD_loop)) {
auto *NewLoopID = LoopIDsMap.lookup(LoopID);
if (!NewLoopID)
NewLoopID = LoopIDsMap[LoopID] = stripDebugLocFromLoopID(LoopID);
if (NewLoopID != LoopID)
I.setMetadata(LLVMContext::MD_loop, NewLoopID);
}
}
}
return Changed;

21
llvm/test/Verifier/llvm.loop-cu-strip.ll Normal file
View File

@ -0,0 +1,21 @@
; RUN: llvm-as -disable-output < %s -o /dev/null 2>&1 | FileCheck %s
; RUN: llvm-as < %s -o - | llvm-dis - | FileCheck %s --check-prefix=CHECK-STRIP
; CHECK: DICompileUnit not listed in llvm.dbg.cu
; CHECK: ignoring invalid debug info in
; CHECK-NOT: DICompileUnit not listed in llvm.dbg.cu
declare hidden void @g() local_unnamed_addr #1 align 2
define hidden void @f() {
tail call void @g() #2, !llvm.loop !5
ret void
}
!llvm.module.flags = !{!0, !1}
!0 = !{i32 2, !"Dwarf Version", i32 4}
!1 = !{i32 2, !"Debug Info Version", i32 3}
; CHECK-STRIP: ![[MD:.*]] = distinct !{![[MD]], !"fake loop metadata"}
!5 = distinct !{!5, !6, !6, !"fake loop metadata"}
!6 = !DILocation(line: 1325, column: 3, scope: !7)
!7 = distinct !DISubprogram(name: "f", scope: !8, file: !8, line: 1324, type: !9, scopeLine: 1324, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition, unit: !11)
!8 = !DIFile(filename: "/", directory: "f.cpp")
!9 = !DISubroutineType(types: !10)
!10 = !{}
!11 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !8)