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clang-p2996/llvm/test/Transforms/GCOVProfiling/linezero.ll
Shiva Chen 2c864551df [DebugInfo] Add DILabel metadata and intrinsic llvm.dbg.label. 
In order to set breakpoints on labels and list source code around
labels, we need collect debug information for labels, i.e., label
name, the function label belong, line number in the file, and the
address label located. In order to keep these information in LLVM
IR and to allow backend to generate debug information correctly.
We create a new kind of metadata for labels, DILabel. The format
of DILabel is

!DILabel(scope: !1, name: "foo", file: !2, line: 3)

We hope to keep debug information as much as possible even the
code is optimized. So, we create a new kind of intrinsic for label
metadata to avoid the metadata is eliminated with basic block.
The intrinsic will keep existing if we keep it from optimized out.
The format of the intrinsic is

llvm.dbg.label(metadata !1)

It has only one argument, that is the DILabel metadata. The
intrinsic will follow the label immediately. Backend could get the
label metadata through the intrinsic's parameter.

We also create DIBuilder API for labels to be used by Frontend.
Frontend could use createLabel() to allocate DILabel objects, and use
insertLabel() to insert llvm.dbg.label intrinsic in LLVM IR.

Differential Revision: https://reviews.llvm.org/D45024

Patch by Hsiangkai Wang.

llvm-svn: 331841
2018-05-09 02:40:45 +00:00

146 lines
7.2 KiB
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; RUN: rm -rf %t && mkdir -p %t
; RUN: sed -e 's|PATTERN|%/t|g' %s | opt -insert-gcov-profiling -disable-output
; RUN: rm %t/linezero.gcno
; RUN: sed -e 's|PATTERN|%/t|g' %s | opt -passes=insert-gcov-profiling -disable-output
; RUN: rm %t/linezero.gcno
; This is a crash test.
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%struct.vector = type { i8 }
; Function Attrs: nounwind
define i32 @_Z4testv() #0 !dbg !15 {
entry:
%retval = alloca i32, align 4
%__range = alloca %struct.vector*, align 8
%ref.tmp = alloca %struct.vector, align 1
%undef.agg.tmp = alloca %struct.vector, align 1
%__begin = alloca i8*, align 8
%__end = alloca i8*, align 8
%spec = alloca i8, align 1
call void @llvm.dbg.declare(metadata %struct.vector** %__range, metadata !27, metadata !DIExpression()), !dbg !30
br label %0
; <label>:0 ; preds = %entry
call void @_Z13TagFieldSpecsv(), !dbg !31
store %struct.vector* %ref.tmp, %struct.vector** %__range, align 8, !dbg !31
call void @llvm.dbg.declare(metadata i8** %__begin, metadata !32, metadata !DIExpression()), !dbg !30
%1 = load %struct.vector*, %struct.vector** %__range, align 8, !dbg !31
%call = call i8* @_ZN6vector5beginEv(%struct.vector* %1), !dbg !31
store i8* %call, i8** %__begin, align 8, !dbg !31
call void @llvm.dbg.declare(metadata i8** %__end, metadata !33, metadata !DIExpression()), !dbg !30
%2 = load %struct.vector*, %struct.vector** %__range, align 8, !dbg !31
%call1 = call i8* @_ZN6vector3endEv(%struct.vector* %2), !dbg !31
store i8* %call1, i8** %__end, align 8, !dbg !31
br label %for.cond, !dbg !31
for.cond: ; preds = %for.inc, %0
%3 = load i8*, i8** %__begin, align 8, !dbg !34
%4 = load i8*, i8** %__end, align 8, !dbg !34
%cmp = icmp ne i8* %3, %4, !dbg !34
br i1 %cmp, label %for.body, label %for.end, !dbg !34
for.body: ; preds = %for.cond
call void @llvm.dbg.declare(metadata i8* %spec, metadata !37, metadata !DIExpression()), !dbg !31
%5 = load i8*, i8** %__begin, align 8, !dbg !38
%6 = load i8, i8* %5, align 1, !dbg !38
store i8 %6, i8* %spec, align 1, !dbg !38
br label %for.inc, !dbg !38
for.inc: ; preds = %for.body
%7 = load i8*, i8** %__begin, align 8, !dbg !40
%incdec.ptr = getelementptr inbounds i8, i8* %7, i32 1, !dbg !40
store i8* %incdec.ptr, i8** %__begin, align 8, !dbg !40
br label %for.cond, !dbg !40
for.end: ; preds = %for.cond
call void @llvm.trap(), !dbg !42
unreachable, !dbg !42
return: ; No predecessors!
%8 = load i32, i32* %retval, !dbg !44
ret i32 %8, !dbg !44
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
declare void @_Z13TagFieldSpecsv() #2
declare i8* @_ZN6vector5beginEv(%struct.vector*) #2
declare i8* @_ZN6vector3endEv(%struct.vector*) #2
; Function Attrs: noreturn nounwind
declare void @llvm.trap() #3
; Function Attrs: nounwind
define void @_Z2f1v() #0 !dbg !20 {
entry:
br label %0
; <label>:0 ; preds = %entry
ret void, !dbg !45
}
attributes #0 = { nounwind "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone }
attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="false" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "no-realign-stack" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #3 = { noreturn nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!23, !24}
!llvm.gcov = !{!25}
!llvm.ident = !{!26}
!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.5.0 (trunk 209871)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !3, globals: !2, imports: !2)
!1 = !DIFile(filename: "<stdin>", directory: "PATTERN")
!2 = !{}
!3 = !{!4}
!4 = !DICompositeType(tag: DW_TAG_structure_type, name: "vector", line: 21, size: 8, align: 8, file: !5, elements: !6, identifier: "_ZTS6vector")
!5 = !DIFile(filename: "linezero.cc", directory: "PATTERN")
!6 = !{!7, !13}
!7 = !DISubprogram(name: "begin", linkageName: "_ZN6vector5beginEv", line: 25, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 25, file: !5, scope: !4, type: !8)
!8 = !DISubroutineType(types: !9)
!9 = !{!10, !12}
!10 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !11)
!11 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
!12 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !4)
!13 = !DISubprogram(name: "end", linkageName: "_ZN6vector3endEv", line: 26, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 26, file: !5, scope: !4, type: !8)
!15 = distinct !DISubprogram(name: "test", linkageName: "_Z4testv", line: 50, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 50, file: !5, scope: !16, type: !17, retainedNodes: !2)
!16 = !DIFile(filename: "linezero.cc", directory: "PATTERN")
!17 = !DISubroutineType(types: !18)
!18 = !{!19}
!19 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!20 = distinct !DISubprogram(name: "f1", linkageName: "_Z2f1v", line: 54, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 54, file: !5, scope: !16, type: !21, retainedNodes: !2)
!21 = !DISubroutineType(types: !22)
!22 = !{null}
!23 = !{i32 2, !"Dwarf Version", i32 4}
!24 = !{i32 2, !"Debug Info Version", i32 3}
!25 = !{!"PATTERN/linezero.o", !0}
!26 = !{!"clang version 3.5.0 (trunk 209871)"}
!27 = !DILocalVariable(name: "__range", flags: DIFlagArtificial, scope: !28, type: !29)
!28 = distinct !DILexicalBlock(line: 51, column: 0, file: !5, scope: !15)
!29 = !DIDerivedType(tag: DW_TAG_rvalue_reference_type, baseType: !4)
!30 = !DILocation(line: 0, scope: !28)
!31 = !DILocation(line: 51, scope: !28)
!32 = !DILocalVariable(name: "__begin", flags: DIFlagArtificial, scope: !28, type: !10)
!33 = !DILocalVariable(name: "__end", flags: DIFlagArtificial, scope: !28, type: !10)
!34 = !DILocation(line: 51, scope: !35)
!35 = distinct !DILexicalBlock(line: 51, column: 0, file: !5, scope: !36)
!36 = distinct !DILexicalBlock(line: 51, column: 0, file: !5, scope: !28)
!37 = !DILocalVariable(name: "spec", line: 51, scope: !28, file: !16, type: !11)
!38 = !DILocation(line: 51, scope: !39)
!39 = distinct !DILexicalBlock(line: 51, column: 0, file: !5, scope: !28)
!40 = !DILocation(line: 51, scope: !41)
!41 = distinct !DILexicalBlock(line: 51, column: 0, file: !5, scope: !28)
!42 = !DILocation(line: 51, scope: !43)
!43 = distinct !DILexicalBlock(line: 51, column: 0, file: !5, scope: !28)
!44 = !DILocation(line: 52, scope: !15)
!45 = !DILocation(line: 54, scope: !20)
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