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[SimplifyCFG] Remap rewritten debug intrinsic operands.
FoldBranchToCommonDest clones instructions to a different basic block, but handles debug intrinsics in a separate path. Previously, when cloning debug intrinsics, their operands were not updated to reference the correct cloned values. As a result, we would emit debug.value intrinsics with broken operand references which are discarded in later passes. This leads to incorrect debuginfo that reports incorrect values for variables. Fix this by remapping debug intrinsic operands when cloning them. Fixes https://bugs.llvm.org/show_bug.cgi?id=45667. Differential Revision: https://reviews.llvm.org/D79602
This commit is contained in:
Ricky Zhou
Vedant Kumar
parent
9de716fac1
commit
30d6c2bb93
@ -2898,9 +2898,14 @@ bool llvm::FoldBranchToCommonDest(BranchInst *BI, MemorySSAUpdater *MSSAU,
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// could replace PBI's branch probabilities with BI's.
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// Copy any debug value intrinsics into the end of PredBlock.
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for (Instruction &I : *BB)
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if (isa<DbgInfoIntrinsic>(I))
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I.clone()->insertBefore(PBI);
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for (Instruction &I : *BB) {
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if (isa<DbgInfoIntrinsic>(I)) {
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Instruction *NewI = I.clone();
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RemapInstruction(NewI, VMap,
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RF_NoModuleLevelChanges | RF_IgnoreMissingLocals);
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NewI->insertBefore(PBI);
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}
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}
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return true;
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}
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134
test/DebugInfo/simplify-cfg-preserve-dbg-values.ll
Normal file
134
test/DebugInfo/simplify-cfg-preserve-dbg-values.ll
Normal file
@ -0,0 +1,134 @@
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; RUN: opt %s -simplifycfg -verify -S -o - | FileCheck %s
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;
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; Verify that SimplifyCFG does not invalidate operands for
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; llvm.dbg.value intrinsics.
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;
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; Reduced from the following example, compiled with
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; -O1 -g -fno-exceptions -fno-discard-value-names:
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;
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; void test() {
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; bool a = false;
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; bool b = false;
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; bool c = false;
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; [&a, &b, &c] { b = true; }();
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;
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; if (a || b || c) {
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; __builtin_debugtrap();
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; }
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; }
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; CHECK: _Z4testv
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; CHECK-NOT: llvm.dbg.value(metadata !
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; CHECK: ret void
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%class.anon = type { i8*, i8*, i8* }
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; Function Attrs: nounwind uwtable
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define dso_local void @_Z4testv() local_unnamed_addr !dbg !7 {
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entry:
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%a = alloca i8, align 1
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%b = alloca i8, align 1
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%c = alloca i8, align 1
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%ref.tmp = alloca %class.anon, align 8
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call void @llvm.dbg.value(metadata i8* %a, metadata !12, metadata !DIExpression(DW_OP_deref)), !dbg !16
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call void @llvm.dbg.value(metadata i8 0, metadata !12, metadata !DIExpression()), !dbg !16
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store i8 0, i8* %a, align 1, !dbg !16
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call void @llvm.dbg.value(metadata i8* %b, metadata !14, metadata !DIExpression(DW_OP_deref)), !dbg !16
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call void @llvm.dbg.value(metadata i8 0, metadata !14, metadata !DIExpression()), !dbg !16
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store i8 0, i8* %b, align 1, !dbg !16
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call void @llvm.dbg.value(metadata i8* %c, metadata !15, metadata !DIExpression(DW_OP_deref)), !dbg !16
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call void @llvm.dbg.value(metadata i8 0, metadata !15, metadata !DIExpression()), !dbg !16
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store i8 0, i8* %c, align 1, !dbg !16
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%0 = bitcast %class.anon* %ref.tmp to i8*, !dbg !16
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%1 = getelementptr inbounds %class.anon, %class.anon* %ref.tmp, i64 0, i32 0, !dbg !16
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store i8* %a, i8** %1, align 8, !dbg !16
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%2 = getelementptr inbounds %class.anon, %class.anon* %ref.tmp, i64 0, i32 1, !dbg !16
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store i8* %b, i8** %2, align 8, !dbg !16
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%3 = getelementptr inbounds %class.anon, %class.anon* %ref.tmp, i64 0, i32 2, !dbg !16
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store i8* %c, i8** %3, align 8, !dbg !16
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call fastcc void @"_ZZ4testvENK3$_0clEv"(%class.anon* nonnull %ref.tmp), !dbg !16
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%4 = load i8, i8* %a, align 1, !dbg !17
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call void @llvm.dbg.value(metadata i8 %4, metadata !12, metadata !DIExpression()), !dbg !16
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%tobool = icmp eq i8 %4, 0, !dbg !17
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br i1 %tobool, label %lor.lhs.false, label %if.then, !dbg !17
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lor.lhs.false: ; preds = %entry
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%5 = load i8, i8* %b, align 1, !dbg !17
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call void @llvm.dbg.value(metadata i8 %5, metadata !14, metadata !DIExpression()), !dbg !16
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%tobool1 = icmp eq i8 %5, 0, !dbg !17
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br i1 %tobool1, label %lor.lhs.false2, label %if.then, !dbg !17
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lor.lhs.false2: ; preds = %lor.lhs.false
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%6 = load i8, i8* %c, align 1, !dbg !17
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call void @llvm.dbg.value(metadata i8 %6, metadata !15, metadata !DIExpression()), !dbg !16
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%tobool3 = icmp eq i8 %6, 0, !dbg !17
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br i1 %tobool3, label %if.end, label %if.then, !dbg !16
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if.then: ; preds = %lor.lhs.false2, %lor.lhs.false, %entry
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call void @llvm.debugtrap(), !dbg !19
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br label %if.end, !dbg !19
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if.end: ; preds = %lor.lhs.false2, %if.then
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call void @llvm.dbg.value(metadata i8* %c, metadata !15, metadata !DIExpression(DW_OP_deref)), !dbg !16
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call void @llvm.dbg.value(metadata i8* %b, metadata !14, metadata !DIExpression(DW_OP_deref)), !dbg !16
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call void @llvm.dbg.value(metadata i8* %a, metadata !12, metadata !DIExpression(DW_OP_deref)), !dbg !16
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ret void, !dbg !16
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}
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; Function Attrs: inlinehint nounwind uwtable
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define internal fastcc void @"_ZZ4testvENK3$_0clEv"(%class.anon* %this) unnamed_addr align 2 !dbg !21 {
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entry:
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call void @llvm.dbg.value(metadata %class.anon* %this, metadata !34, metadata !DIExpression()), !dbg !36
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%0 = getelementptr inbounds %class.anon, %class.anon* %this, i32 0, i32 1, !dbg !36
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%1 = load i8*, i8** %0, align 8, !dbg !36
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store i8 1, i8* %1, align 1, !dbg !36
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ret void, !dbg !36
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}
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; Function Attrs: nounwind
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declare void @llvm.debugtrap()
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 8.0.1-4 (tags/RELEASE_801/final)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, nameTableKind: None)
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!1 = !DIFile(filename: "test.cc", directory: "/dir")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{!"clang version 8.0.1-4 (tags/RELEASE_801/final)"}
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!7 = distinct !DISubprogram(name: "test", linkageName: "_Z4testv", scope: !8, file: !8, line: 1, type: !9, scopeLine: 1, flags: DIFlagPrototyped, spFlags: DISPFlagDefinition | DISPFlagOptimized, unit: !0, retainedNodes: !11)
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!8 = !DIFile(filename: "test.cc", directory: "/dir")
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!9 = !DISubroutineType(types: !10)
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!10 = !{null}
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!11 = !{!12, !14, !15}
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!12 = !DILocalVariable(name: "a", scope: !7, file: !8, line: 2, type: !13)
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!13 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
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!14 = !DILocalVariable(name: "b", scope: !7, file: !8, line: 3, type: !13)
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!15 = !DILocalVariable(name: "c", scope: !7, file: !8, line: 4, type: !13)
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!16 = !DILocation(line: 2, scope: !7)
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!17 = !DILocation(line: 7, scope: !18)
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!18 = distinct !DILexicalBlock(scope: !7, file: !8, line: 7)
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!19 = !DILocation(line: 8, scope: !20)
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!20 = distinct !DILexicalBlock(scope: !18, file: !8, line: 7)
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!21 = distinct !DISubprogram(name: "operator()", linkageName: "_ZZ4testvENK3$_0clEv", scope: !22, file: !8, line: 5, type: !28, scopeLine: 5, flags: DIFlagPrototyped, spFlags: DISPFlagLocalToUnit | DISPFlagDefinition | DISPFlagOptimized, unit: !0, declaration: !32, retainedNodes: !33)
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!22 = distinct !DICompositeType(tag: DW_TAG_class_type, scope: !7, file: !8, line: 5, size: 192, flags: DIFlagTypePassByValue, elements: !23)
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!23 = !{!24, !26, !27}
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!24 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !22, file: !8, line: 5, baseType: !25, size: 64)
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!25 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !13, size: 64)
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!26 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !22, file: !8, line: 5, baseType: !25, size: 64, offset: 64)
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!27 = !DIDerivedType(tag: DW_TAG_member, name: "c", scope: !22, file: !8, line: 5, baseType: !25, size: 64, offset: 128)
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!28 = !DISubroutineType(types: !29)
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!29 = !{null, !30}
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!30 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !31, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
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!31 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !22)
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!32 = !DISubprogram(name: "operator()", scope: !22, file: !8, line: 5, type: !28, scopeLine: 5, flags: DIFlagPublic | DIFlagPrototyped, spFlags: DISPFlagOptimized)
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!33 = !{!34}
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!34 = !DILocalVariable(name: "this", arg: 1, scope: !21, type: !35, flags: DIFlagArtificial | DIFlagObjectPointer)
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!35 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !31, size: 64)
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!36 = !DILocation(line: 0, scope: !21)
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