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d52939585a
The discriminators pass relied on the presence of llvm.dbg.cu to decide whether to add discriminators, but this fails in the case where debug info is only enabled partially when -fprofile-sample-use is active. The reason llvm.dbg.cu is not present in these cases is to prevent codegen from emitting debug info (as it is only used for the sample profile pass). This changes the discriminators pass to also emit discriminators even when debug info is not being emitted. llvm-svn: 252763
77 lines
3.5 KiB
LLVM
77 lines
3.5 KiB
LLVM
; RUN: opt < %s -add-discriminators -S | FileCheck %s
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; We should not generate discriminators for DWARF versions prior to 4.
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;
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; Original code:
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;
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; int foo(long i) {
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; if (i < 5) return 2; else return 90;
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; }
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;
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; None of the !dbg nodes associated with the if() statement should be
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; altered. If they are, it means that the discriminators pass added a
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; new lexical scope.
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define i32 @foo(i64 %i) #0 !dbg !4 {
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entry:
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%retval = alloca i32, align 4
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%i.addr = alloca i64, align 8
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store i64 %i, i64* %i.addr, align 8
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call void @llvm.dbg.declare(metadata i64* %i.addr, metadata !13, metadata !DIExpression()), !dbg !14
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%0 = load i64, i64* %i.addr, align 8, !dbg !15
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; CHECK: %0 = load i64, i64* %i.addr, align 8, !dbg ![[ENTRY:[0-9]+]]
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%cmp = icmp slt i64 %0, 5, !dbg !15
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; CHECK: %cmp = icmp slt i64 %0, 5, !dbg ![[ENTRY:[0-9]+]]
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br i1 %cmp, label %if.then, label %if.else, !dbg !15
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; CHECK: br i1 %cmp, label %if.then, label %if.else, !dbg ![[ENTRY:[0-9]+]]
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if.then: ; preds = %entry
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store i32 2, i32* %retval, !dbg !15
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br label %return, !dbg !15
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if.else: ; preds = %entry
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store i32 90, i32* %retval, !dbg !15
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br label %return, !dbg !15
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return: ; preds = %if.else, %if.then
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%1 = load i32, i32* %retval, !dbg !17
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ret i32 %1, !dbg !17
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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 "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" }
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attributes #1 = { nounwind readnone }
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; We should be able to add discriminators even in the absence of llvm.dbg.cu.
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; When using sample profiles, the front end will generate line tables but it
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; does not generate llvm.dbg.cu to prevent codegen from emitting debug info
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; to the final binary.
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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_C99, producer: "clang version 3.5.0 ", isOptimized: false, emissionKind: 1, file: !1, enums: !2, retainedTypes: !2, subprograms: !3, globals: !2, imports: !2)
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!1 = !DIFile(filename: "no-discriminators", directory: ".")
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!2 = !{}
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!3 = !{!4}
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!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)
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; CHECK: ![[FOO:[0-9]+]] = distinct !DISubprogram(name: "foo"
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!5 = !DIFile(filename: "no-discriminators", directory: ".")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !9}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !DIBasicType(tag: DW_TAG_base_type, name: "long int", size: 64, align: 64, encoding: DW_ATE_signed)
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!10 = !{i32 2, !"Dwarf Version", i32 2}
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; CHECK: !{i32 2, !"Dwarf Version", i32 2}
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!11 = !{i32 1, !"Debug Info Version", i32 3}
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!12 = !{!"clang version 3.5.0 "}
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!13 = !DILocalVariable(name: "i", line: 1, arg: 1, scope: !4, file: !5, type: !9)
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!14 = !DILocation(line: 1, scope: !4)
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!15 = !DILocation(line: 2, scope: !16)
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; CHECK: ![[ENTRY]] = !DILocation(line: 2, scope: ![[BLOCK:[0-9]+]])
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!16 = distinct !DILexicalBlock(line: 2, column: 0, file: !1, scope: !4)
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; CHECK: ![[BLOCK]] = distinct !DILexicalBlock(scope: ![[FOO]],{{.*}} line: 2)
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!17 = !DILocation(line: 3, scope: !4)
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