1; RUN: opt < %s -passes=add-discriminators -S | FileCheck %s 2 3; We should not generate discriminators for DWARF versions prior to 4. 4; 5; Original code: 6; 7; int foo(long i) { 8; if (i < 5) return 2; else return 90; 9; } 10; 11; None of the !dbg nodes associated with the if() statement should be 12; altered. If they are, it means that the discriminators pass added a 13; new lexical scope. 14 15define i32 @foo(i64 %i) #0 !dbg !4 { 16entry: 17 %retval = alloca i32, align 4 18 %i.addr = alloca i64, align 8 19 store i64 %i, ptr %i.addr, align 8 20 call void @llvm.dbg.declare(metadata ptr %i.addr, metadata !13, metadata !DIExpression()), !dbg !14 21 %0 = load i64, ptr %i.addr, align 8, !dbg !15 22; CHECK: %0 = load i64, ptr %i.addr, align 8, !dbg ![[ENTRY:[0-9]+]] 23 %cmp = icmp slt i64 %0, 5, !dbg !15 24; CHECK: %cmp = icmp slt i64 %0, 5, !dbg ![[ENTRY:[0-9]+]] 25 br i1 %cmp, label %if.then, label %if.else, !dbg !15 26; CHECK: br i1 %cmp, label %if.then, label %if.else, !dbg ![[ENTRY:[0-9]+]] 27 28if.then: ; preds = %entry 29 store i32 2, ptr %retval, !dbg !15 30 br label %return, !dbg !15 31 32if.else: ; preds = %entry 33 store i32 90, ptr %retval, !dbg !15 34 br label %return, !dbg !15 35 36return: ; preds = %if.else, %if.then 37 %1 = load i32, ptr %retval, !dbg !17 38 ret i32 %1, !dbg !17 39} 40 41; Function Attrs: nounwind readnone 42declare void @llvm.dbg.declare(metadata, metadata, metadata) #1 43 44attributes #0 = { nounwind uwtable "less-precise-fpmad"="false" "frame-pointer"="all" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" } 45attributes #1 = { nounwind readnone } 46 47; We should be able to add discriminators even in the absence of llvm.dbg.cu. 48; When using sample profiles, the front end will generate line tables but it 49; does not generate llvm.dbg.cu to prevent codegen from emitting debug info 50; to the final binary. 51!llvm.dbg.cu = !{!0} 52!llvm.module.flags = !{!10, !11} 53!llvm.ident = !{!12} 54 55; CHECK: !{i32 2, !"Dwarf Version", i32 2} 56!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2) 57!1 = !DIFile(filename: "no-discriminators", directory: ".") 58!2 = !{} 59!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !2) 60; CHECK: ![[FOO:[0-9]+]] = distinct !DISubprogram(name: "foo" 61!5 = !DIFile(filename: "no-discriminators", directory: ".") 62!6 = !DISubroutineType(types: !7) 63!7 = !{!8, !9} 64!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed) 65!9 = !DIBasicType(tag: DW_TAG_base_type, name: "long int", size: 64, align: 64, encoding: DW_ATE_signed) 66!10 = !{i32 2, !"Dwarf Version", i32 2} 67!11 = !{i32 1, !"Debug Info Version", i32 3} 68!12 = !{!"clang version 3.5.0 "} 69!13 = !DILocalVariable(name: "i", line: 1, arg: 1, scope: !4, file: !5, type: !9) 70!14 = !DILocation(line: 1, scope: !4) 71!15 = !DILocation(line: 2, scope: !16) 72; CHECK: ![[ENTRY]] = !DILocation(line: 2, scope: ![[BLOCK:[0-9]+]]) 73!16 = distinct !DILexicalBlock(line: 2, column: 0, file: !1, scope: !4) 74; CHECK: ![[BLOCK]] = distinct !DILexicalBlock(scope: ![[FOO]],{{.*}} line: 2) 75!17 = !DILocation(line: 3, scope: !4) 76