101 lines
4.3 KiB
LLVM
101 lines
4.3 KiB
LLVM
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; RUN: opt -adce -S < %s | FileCheck %s
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; Test that debug info intrinsics in dead scopes get eliminated by -adce.
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; Generated with 'clang -g -S -emit-llvm | opt -mem2reg -inline' at r262899
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; (before -adce was augmented) and then hand-reduced. This was the input:
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;
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;;void sink(void);
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;;
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;;void variable_in_unused_subscope(void) {
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;; { int i = 0; }
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;; sink();
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;;}
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;;
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;;void variable_in_parent_scope(void) {
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;; int i = 0;
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;; { sink(); }
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;;}
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;;
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;;static int empty_function_with_unused_variable(void) {
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;; { int i = 0; }
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;; return 0;
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;;}
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;;
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;;void calls_empty_function_with_unused_variable_in_unused_subscope(void) {
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;; { empty_function_with_unused_variable(); }
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;; sink();
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;;}
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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declare void @sink()
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; CHECK-LABEL: define void @variable_in_unused_subscope(
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define void @variable_in_unused_subscope() !dbg !4 {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @sink
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; CHECK-NEXT: ret void
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entry:
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call void @llvm.dbg.value(metadata i32 0, metadata !15, metadata !17), !dbg !18
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call void @sink(), !dbg !19
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ret void, !dbg !20
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}
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; CHECK-LABEL: define void @variable_in_parent_scope(
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define void @variable_in_parent_scope() !dbg !7 {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @llvm.dbg.value
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; CHECK-NEXT: call void @sink
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; CHECK-NEXT: ret void
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entry:
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call void @llvm.dbg.value(metadata i32 0, metadata !21, metadata !17), !dbg !22
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call void @sink(), !dbg !23
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ret void, !dbg !25
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}
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; CHECK-LABEL: define void @calls_empty_function_with_unused_variable_in_unused_subscope(
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define void @calls_empty_function_with_unused_variable_in_unused_subscope() !dbg !8 {
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; CHECK-NEXT: entry:
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; CHECK-NEXT: call void @sink
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; CHECK-NEXT: ret void
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entry:
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call void @llvm.dbg.value(metadata i32 0, metadata !26, metadata !17), !dbg !28
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call void @sink(), !dbg !31
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ret void, !dbg !32
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!14}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "t.c", directory: "/path/to/test/Transforms/ADCE")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "variable_in_unused_subscope", scope: !1, file: !1, line: 3, type: !5, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!5 = !DISubroutineType(types: !6)
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!6 = !{null}
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!7 = distinct !DISubprogram(name: "variable_in_parent_scope", scope: !1, file: !1, line: 8, type: !5, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!8 = distinct !DISubprogram(name: "calls_empty_function_with_unused_variable_in_unused_subscope", scope: !1, file: !1, line: 18, type: !5, isLocal: false, isDefinition: true, scopeLine: 18, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!10 = distinct !DISubprogram(name: "empty_function_with_unused_variable", scope: !1, file: !1, line: 13, type: !11, isLocal: true, isDefinition: true, scopeLine: 13, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!11 = !DISubroutineType(types: !12)
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!12 = !{!13}
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!13 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!14 = !{i32 2, !"Debug Info Version", i32 3}
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!15 = !DILocalVariable(name: "i", scope: !16, file: !1, line: 4, type: !13)
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!16 = distinct !DILexicalBlock(scope: !4, file: !1, line: 4, column: 3)
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!17 = !DIExpression()
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!18 = !DILocation(line: 4, column: 9, scope: !16)
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!19 = !DILocation(line: 5, column: 3, scope: !4)
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!20 = !DILocation(line: 6, column: 1, scope: !4)
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!21 = !DILocalVariable(name: "i", scope: !7, file: !1, line: 9, type: !13)
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!22 = !DILocation(line: 9, column: 7, scope: !7)
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!23 = !DILocation(line: 10, column: 5, scope: !24)
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!24 = distinct !DILexicalBlock(scope: !7, file: !1, line: 10, column: 3)
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!25 = !DILocation(line: 11, column: 1, scope: !7)
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!26 = !DILocalVariable(name: "i", scope: !27, file: !1, line: 14, type: !13)
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!27 = distinct !DILexicalBlock(scope: !10, file: !1, line: 14, column: 3)
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!28 = !DILocation(line: 14, column: 9, scope: !27, inlinedAt: !29)
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!29 = distinct !DILocation(line: 19, column: 5, scope: !30)
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!30 = distinct !DILexicalBlock(scope: !8, file: !1, line: 19, column: 3)
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!31 = !DILocation(line: 20, column: 3, scope: !8)
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!32 = !DILocation(line: 21, column: 1, scope: !8)
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