1; RUN: opt < %s -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, i64* %i.addr, align 8
20  call void @llvm.dbg.declare(metadata i64* %i.addr, metadata !13, metadata !DIExpression()), !dbg !14
21  %0 = load i64, i64* %i.addr, align 8, !dbg !15
22; CHECK:  %0 = load i64, i64* %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, i32* %retval, !dbg !15
30  br label %return, !dbg !15
31
32if.else:                                          ; preds = %entry
33  store i32 90, i32* %retval, !dbg !15
34  br label %return, !dbg !15
35
36return:                                           ; preds = %if.else, %if.then
37  %1 = load i32, i32* %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" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
56!1 = !DIFile(filename: "no-discriminators", directory: ".")
57!2 = !{}
58!3 = !{!4}
59!4 = distinct !DISubprogram(name: "foo", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 1, file: !1, scope: !5, type: !6, variables: !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; CHECK: !{i32 2, !"Dwarf Version", i32 2}
68!11 = !{i32 1, !"Debug Info Version", i32 3}
69!12 = !{!"clang version 3.5.0 "}
70!13 = !DILocalVariable(name: "i", line: 1, arg: 1, scope: !4, file: !5, type: !9)
71!14 = !DILocation(line: 1, scope: !4)
72!15 = !DILocation(line: 2, scope: !16)
73; CHECK: ![[ENTRY]] = !DILocation(line: 2, scope: ![[BLOCK:[0-9]+]])
74!16 = distinct !DILexicalBlock(line: 2, column: 0, file: !1, scope: !4)
75; CHECK: ![[BLOCK]] = distinct !DILexicalBlock(scope: ![[FOO]],{{.*}} line: 2)
76!17 = !DILocation(line: 3, scope: !4)
77