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llvm-mirror/test/DebugInfo/Generic/global-sra-array.ll
Shiva Chen a2029fa58e [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

128 lines
6.3 KiB
LLVM
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; RUN: opt -S -globalopt < %s | FileCheck %s
source_filename = "test.c"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.12.0"
%struct.mystruct = type { i32, i64 }
; Generated at -Os from:
;
; static struct { int a; char b; } array[2];
; void __attribute__((nodebug)) foo(int in) { array[0].a = in; }
; void __attribute__((nodebug)) bar(int in) { array[1].a = in; }
; int main(int argc, char **argv)
; {
; foo(argv[0][1]);
; bar(argv[0][1]);
; return array[0].a + array[1].a;
; }
%struct.anon = type { i32, i8 }
; This array is first split into two struct, which are then split into their
; elements, of which only .a survives.
@array = internal global [2 x %struct.anon] zeroinitializer, align 16, !dbg !0
; CHECK: @array.0.0 = internal unnamed_addr global i32 0, align 16, !dbg ![[EL0:.*]]
; CHECK: @array.1.0 = internal unnamed_addr global i32 0, align 8, !dbg ![[EL1:.*]]
;
; CHECK: ![[EL0]] = !DIGlobalVariableExpression(var: ![[VAR:.*]], expr: !DIExpression(DW_OP_LLVM_fragment, 0, 32))
; CHECK: ![[VAR]] = distinct !DIGlobalVariable(name: "array"
; CHECK: ![[EL1]] = !DIGlobalVariableExpression(var: ![[VAR]], expr: !DIExpression(DW_OP_LLVM_fragment, 64, 32))
; Function Attrs: nounwind optsize ssp uwtable
define void @foo(i32 %in) #0 {
entry:
store i32 %in, i32* getelementptr inbounds ([2 x %struct.anon], [2 x %struct.anon]* @array, i64 0, i64 0, i32 0), align 16, !tbaa !20
ret void
}
; Function Attrs: nounwind optsize ssp uwtable
define void @bar(i32 %in) #0 {
entry:
store i32 %in, i32* getelementptr inbounds ([2 x %struct.anon], [2 x %struct.anon]* @array, i64 0, i64 1, i32 0), align 8, !tbaa !20
ret void
}
; Function Attrs: nounwind optsize ssp uwtable
define i32 @main(i32 %argc, i8** %argv) #0 !dbg !25 {
entry:
call void @llvm.dbg.value(metadata i32 %argc, metadata !31, metadata !33), !dbg !34
call void @llvm.dbg.value(metadata i8** %argv, metadata !32, metadata !33), !dbg !35
%0 = load i8*, i8** %argv, align 8, !dbg !36, !tbaa !37
%arrayidx1 = getelementptr inbounds i8, i8* %0, i64 1, !dbg !36
%1 = load i8, i8* %arrayidx1, align 1, !dbg !36, !tbaa !39
%conv = sext i8 %1 to i32, !dbg !36
call void @foo(i32 %conv) #2, !dbg !40
%2 = load i8*, i8** %argv, align 8, !dbg !41, !tbaa !37
%arrayidx3 = getelementptr inbounds i8, i8* %2, i64 1, !dbg !41
%3 = load i8, i8* %arrayidx3, align 1, !dbg !41, !tbaa !39
%conv4 = sext i8 %3 to i32, !dbg !41
call void @bar(i32 %conv4) #2, !dbg !42
%4 = load i32, i32* getelementptr inbounds ([2 x %struct.anon], [2 x %struct.anon]* @array, i64 0, i64 0, i32 0), align 16, !dbg !43, !tbaa !20
%5 = load i32, i32* getelementptr inbounds ([2 x %struct.anon], [2 x %struct.anon]* @array, i64 0, i64 1, i32 0), align 8, !dbg !44, !tbaa !20
%add = add nsw i32 %4, %5, !dbg !45
ret i32 %add, !dbg !46
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { nounwind optsize ssp uwtable "correctly-rounded-divide-sqrt-fp-math"="false" "disable-tail-calls"="false" "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-jump-tables"="false" "no-nans-fp-math"="false" "no-signed-zeros-fp-math"="false" "no-trapping-math"="false" "stack-protector-buffer-size"="8" "target-cpu"="penryn" "target-features"="+cx16,+fxsr,+mmx,+sse,+sse2,+sse3,+sse4.1,+ssse3,+x87" "unsafe-fp-math"="false" "use-soft-float"="false" }
attributes #1 = { nounwind readnone speculatable }
attributes #2 = { optsize }
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!15, !16, !17, !18}
!llvm.ident = !{!19}
!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = distinct !DIGlobalVariable(name: "array", scope: !2, file: !3, line: 1, type: !6, isLocal: true, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 6.0.0 (trunk 309960) (llvm/trunk 309961)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
!3 = !DIFile(filename: "test.c", directory: "/")
!4 = !{}
!5 = !{!0}
!6 = !DICompositeType(tag: DW_TAG_array_type, baseType: !7, size: 128, elements: !13)
!7 = distinct !DICompositeType(tag: DW_TAG_structure_type, file: !3, line: 1, size: 64, elements: !8)
!8 = !{!9, !11}
!9 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !7, file: !3, line: 1, baseType: !10, size: 32)
!10 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!11 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !7, file: !3, line: 1, baseType: !12, size: 8, offset: 32)
!12 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!13 = !{!14}
!14 = !DISubrange(count: 2)
!15 = !{i32 2, !"Dwarf Version", i32 4}
!16 = !{i32 2, !"Debug Info Version", i32 3}
!17 = !{i32 1, !"wchar_size", i32 4}
!18 = !{i32 7, !"PIC Level", i32 2}
!19 = !{!"clang version 6.0.0 (trunk 309960) (llvm/trunk 309961)"}
!20 = !{!21, !22, i64 0}
!21 = !{!"", !22, i64 0, !23, i64 4}
!22 = !{!"int", !23, i64 0}
!23 = !{!"omnipotent char", !24, i64 0}
!24 = !{!"Simple C/C++ TBAA"}
!25 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 4, type: !26, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !30)
!26 = !DISubroutineType(types: !27)
!27 = !{!10, !10, !28}
!28 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !29, size: 64)
!29 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
!30 = !{!31, !32}
!31 = !DILocalVariable(name: "argc", arg: 1, scope: !25, file: !3, line: 4, type: !10)
!32 = !DILocalVariable(name: "argv", arg: 2, scope: !25, file: !3, line: 4, type: !28)
!33 = !DIExpression()
!34 = !DILocation(line: 4, column: 14, scope: !25)
!35 = !DILocation(line: 4, column: 27, scope: !25)
!36 = !DILocation(line: 6, column: 7, scope: !25)
!37 = !{!38, !38, i64 0}
!38 = !{!"any pointer", !23, i64 0}
!39 = !{!23, !23, i64 0}
!40 = !DILocation(line: 6, column: 3, scope: !25)
!41 = !DILocation(line: 7, column: 7, scope: !25)
!42 = !DILocation(line: 7, column: 3, scope: !25)
!43 = !DILocation(line: 8, column: 19, scope: !25)
!44 = !DILocation(line: 8, column: 32, scope: !25)
!45 = !DILocation(line: 8, column: 21, scope: !25)
!46 = !DILocation(line: 8, column: 3, scope: !25)
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