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Update the discriminator assignment algorithm
* If a scope has already been assigned a discriminator, do not reassign a nested discriminator for it. * If the file and line both match, even if the column does not match, we should assign a new discriminator for the stmt. original code: ; #1 int foo(int i) { ; #2 if (i == 3 || i == 5) return 100; else return 99; ; #3 } ; i == 3: discriminator 0 ; i == 5: discriminator 2 ; return 100: discriminator 1 ; return 99: discriminator 3 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@251680 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Dehao Chen
parent
a18aee17c8
commit
8ce527d38a
@ -180,7 +180,7 @@ bool AddDiscriminators::runOnFunction(Function &F) {
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BasicBlock *Succ = Last->getSuccessor(I);
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Instruction *First = Succ->getFirstNonPHIOrDbgOrLifetime();
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const DILocation *FirstDIL = First->getDebugLoc();
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if (!FirstDIL)
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if (!FirstDIL || FirstDIL->getDiscriminator())
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continue;
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// If the first instruction (First) of Succ is at the same file
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@ -202,21 +202,22 @@ bool AddDiscriminators::runOnFunction(Function &F) {
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unsigned Discriminator = FirstDIL->computeNewDiscriminator();
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auto *NewScope =
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Builder.createLexicalBlockFile(Scope, File, Discriminator);
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auto *NewDIL =
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DILocation::get(Ctx, FirstDIL->getLine(), FirstDIL->getColumn(),
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NewScope, FirstDIL->getInlinedAt());
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DebugLoc newDebugLoc = NewDIL;
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// Attach this new debug location to First and every
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// instruction following First that shares the same location.
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for (BasicBlock::iterator I1(*First), E1 = Succ->end(); I1 != E1;
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++I1) {
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if (I1->getDebugLoc().get() != FirstDIL)
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break;
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I1->setDebugLoc(newDebugLoc);
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DEBUG(dbgs() << NewDIL->getFilename() << ":" << NewDIL->getLine()
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<< ":" << NewDIL->getColumn() << ":"
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<< NewDIL->getDiscriminator() << *I1 << "\n");
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const DILocation *CurrentDIL = I1->getDebugLoc();
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if (CurrentDIL && CurrentDIL->getLine() == FirstDIL->getLine() &&
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CurrentDIL->getFilename() == FirstDIL->getFilename()) {
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I1->setDebugLoc(DILocation::get(Ctx, CurrentDIL->getLine(),
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CurrentDIL->getColumn(), NewScope,
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CurrentDIL->getInlinedAt()));
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DEBUG(dbgs() << CurrentDIL->getFilename() << ":"
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<< CurrentDIL->getLine() << ":"
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<< CurrentDIL->getColumn() << ":"
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<< CurrentDIL->getDiscriminator() << *I1 << "\n");
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}
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}
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DEBUG(dbgs() << "\n");
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Changed = true;
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98
test/Transforms/AddDiscriminators/oneline.ll
Normal file
98
test/Transforms/AddDiscriminators/oneline.ll
Normal file
@ -0,0 +1,98 @@
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; RUN: opt < %s -add-discriminators -S | FileCheck %s
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; Discriminator support for code that is written in one line:
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; #1 int foo(int i) {
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; #2 if (i == 3 || i == 5) return 100; else return 99;
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; #3 }
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; i == 3: discriminator 0
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; i == 5: discriminator 2
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; return 100: discriminator 1
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; return 99: discriminator 3
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define i32 @_Z3fooi(i32 %i) #0 {
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%1 = alloca i32, align 4
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%2 = alloca i32, align 4
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store i32 %i, i32* %2, align 4, !tbaa !13
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call void @llvm.dbg.declare(metadata i32* %2, metadata !9, metadata !17), !dbg !18
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%3 = load i32, i32* %2, align 4, !dbg !19, !tbaa !13
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%4 = icmp eq i32 %3, 3, !dbg !21
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br i1 %4, label %8, label %5, !dbg !22
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; <label>:5 ; preds = %0
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%6 = load i32, i32* %2, align 4, !dbg !23, !tbaa !13
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; CHECK: %6 = load i32, i32* %2, align 4, !dbg ![[THEN1:[0-9]+]],{{.*}}
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%7 = icmp eq i32 %6, 5, !dbg !24
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; CHECK: %7 = icmp eq i32 %6, 5, !dbg ![[THEN2:[0-9]+]]
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br i1 %7, label %8, label %9, !dbg !25
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; CHECK: br i1 %7, label %8, label %9, !dbg ![[THEN3:[0-9]+]]
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; <label>:8 ; preds = %5, %0
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store i32 100, i32* %1, align 4, !dbg !26
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; CHECK: store i32 100, i32* %1, align 4, !dbg ![[ELSE:[0-9]+]]
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br label %10, !dbg !26
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; CHECK: br label %10, !dbg ![[ELSE]]
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; <label>:9 ; preds = %5
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store i32 99, i32* %1, align 4, !dbg !27
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; CHECK: store i32 99, i32* %1, align 4, !dbg ![[COMBINE:[0-9]+]]
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br label %10, !dbg !27
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; CHECK: br label %10, !dbg ![[COMBINE]]
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; <label>:10 ; preds = %9, %8
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%11 = load i32, i32* %1, align 4, !dbg !28
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ret i32 %11, !dbg !28
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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attributes #0 = { nounwind uwtable "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="x86-64" "target-features"="+fxsr,+mmx,+sse,+sse2" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!10, !11}
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!llvm.ident = !{!12}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !1, producer: "clang version 3.8.0 (trunk 250915)", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, subprograms: !3)
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!1 = !DIFile(filename: "a.cc", directory: "/usr/local/google/home/dehao/discr")
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!2 = !{}
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!3 = !{!4}
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!4 = distinct !DISubprogram(name: "foo", linkageName: "_Z3fooi", scope: !1, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, function: i32 (i32)* @_Z3fooi, variables: !8)
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!5 = !DISubroutineType(types: !6)
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!6 = !{!7, !7}
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{!9}
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!9 = !DILocalVariable(name: "i", arg: 1, scope: !4, file: !1, line: 1, type: !7)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{!"clang version 3.8.0 (trunk 250915)"}
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!13 = !{!14, !14, i64 0}
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!14 = !{!"int", !15, i64 0}
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!15 = !{!"omnipotent char", !16, i64 0}
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!16 = !{!"Simple C/C++ TBAA"}
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!17 = !DIExpression()
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!18 = !DILocation(line: 1, column: 13, scope: !4)
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!19 = !DILocation(line: 2, column: 7, scope: !20)
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!20 = distinct !DILexicalBlock(scope: !4, file: !1, line: 2, column: 7)
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!21 = !DILocation(line: 2, column: 9, scope: !20)
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!22 = !DILocation(line: 2, column: 14, scope: !20)
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!23 = !DILocation(line: 2, column: 17, scope: !20)
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!24 = !DILocation(line: 2, column: 19, scope: !20)
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!25 = !DILocation(line: 2, column: 7, scope: !4)
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!26 = !DILocation(line: 2, column: 25, scope: !20)
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!27 = !DILocation(line: 2, column: 42, scope: !20)
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!28 = !DILocation(line: 3, column: 1, scope: !4)
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; CHECK: ![[THEN1]] = !DILocation(line: 2, column: 17, scope: ![[THENBLOCK:[0-9]+]])
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; CHECK: ![[THENBLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 2)
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; CHECK: ![[THEN2]] = !DILocation(line: 2, column: 19, scope: ![[THENBLOCK]])
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; CHECK: ![[THEN3]] = !DILocation(line: 2, column: 7, scope: ![[THENBLOCK]])
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; CHECK: ![[ELSE]] = !DILocation(line: 2, column: 25, scope: ![[ELSEBLOCK:[0-9]+]])
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; CHECK: ![[ELSEBLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 1)
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; CHECK: ![[COMBINE]] = !DILocation(line: 2, column: 42, scope: ![[COMBINEBLOCK:[0-9]+]])
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; CHECK: ![[COMBINEBLOCK]] = !DILexicalBlockFile({{.*}} discriminator: 3)
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