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llvm-mirror/test/DebugInfo/X86/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
5.5 KiB
LLVM
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; ModuleID = 'array.c'
;
; From (clang -g -c -O1):
;
; void f(int* p) {
; p[0] = 42;
; }
;
; int main(int argc, char** argv) {
; int array[4] = { 0, 1, 2, 3 };
; f(array);
; return array[0];
; }
;
; RUN: llc -filetype=asm %s -o - | FileCheck %s
; RUN: llc -filetype=obj %s -o - | llvm-dwarfdump -v - ---debug-info | FileCheck %s --check-prefix=DWARF
; CHECK-LABEL: _main:
; CHECK: movaps {{.*}}, (%rsp)
; CHECK: movq %rsp, %rdi
; CHECK: callq _f
; DWARF: DW_TAG_variable
; DWARF-NEXT: DW_AT_location [DW_FORM_exprloc] (DW_OP_fbreg +0)
; DWARF-NEXT: DW_AT_name [DW_FORM_strp] ( {{.*}} = "array")
; ModuleID = '/tmp/array.c'
source_filename = "/tmp/array.c"
target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.12.0"
@main.array = private unnamed_addr constant [4 x i32] [i32 0, i32 1, i32 2, i32 3], align 16
; Function Attrs: nounwind ssp uwtable
define void @f(i32* nocapture %p) local_unnamed_addr #0 !dbg !8 {
entry:
tail call void @llvm.dbg.value(metadata i32* %p, metadata !14, metadata !15), !dbg !16
store i32 42, i32* %p, align 4, !dbg !17, !tbaa !18
ret void, !dbg !22
}
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
; Function Attrs: nounwind ssp uwtable
define i32 @main(i32 %argc, i8** nocapture readnone %argv) local_unnamed_addr #0 !dbg !23 {
entry:
%array = alloca [4 x i32], align 16
tail call void @llvm.dbg.value(metadata i32 %argc, metadata !30, metadata !15), !dbg !36
tail call void @llvm.dbg.value(metadata i8** %argv, metadata !31, metadata !15), !dbg !37
%0 = bitcast [4 x i32]* %array to i8*, !dbg !38
call void @llvm.lifetime.start.p0i8(i64 16, i8* nonnull %0) #3, !dbg !38
tail call void @llvm.dbg.declare(metadata [4 x i32]* %array, metadata !32, metadata !15), !dbg !39
call void @llvm.memcpy.p0i8.p0i8.i64(i8* align 16 nonnull %0, i8* align 16 bitcast ([4 x i32]* @main.array to i8*), i64 16, i1 false), !dbg !39
%arraydecay = getelementptr inbounds [4 x i32], [4 x i32]* %array, i64 0, i64 0, !dbg !40
call void @f(i32* nonnull %arraydecay), !dbg !41
%1 = load i32, i32* %arraydecay, align 16, !dbg !42, !tbaa !18
call void @llvm.lifetime.end.p0i8(i64 16, i8* nonnull %0) #3, !dbg !43
ret i32 %1, !dbg !44
}
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.start.p0i8(i64, i8* nocapture) #2
; Function Attrs: argmemonly nounwind
declare void @llvm.memcpy.p0i8.p0i8.i64(i8* nocapture writeonly, i8* nocapture readonly, i64, i1) #2
; Function Attrs: argmemonly nounwind
declare void @llvm.lifetime.end.p0i8(i64, i8* nocapture) #2
; Function Attrs: nounwind readnone speculatable
declare void @llvm.dbg.value(metadata, metadata, metadata) #1
attributes #0 = { nounwind ssp uwtable }
attributes #1 = { nounwind readnone speculatable }
attributes #2 = { argmemonly nounwind }
attributes #3 = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!3, !4, !5, !6}
!llvm.ident = !{!7}
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 5.0.0 (trunk 303873) (llvm/trunk 303875)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
!1 = !DIFile(filename: "/tmp/array.c", directory: "/")
!2 = !{}
!3 = !{i32 2, !"Dwarf Version", i32 4}
!4 = !{i32 2, !"Debug Info Version", i32 3}
!5 = !{i32 1, !"wchar_size", i32 4}
!6 = !{i32 7, !"PIC Level", i32 2}
!7 = !{!"clang version 5.0.0 (trunk 303873) (llvm/trunk 303875)"}
!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 1, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !13)
!9 = !DISubroutineType(types: !10)
!10 = !{null, !11}
!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!13 = !{!14}
!14 = !DILocalVariable(name: "p", arg: 1, scope: !8, file: !1, line: 1, type: !11)
!15 = !DIExpression()
!16 = !DILocation(line: 1, column: 13, scope: !8)
!17 = !DILocation(line: 2, column: 8, scope: !8)
!18 = !{!19, !19, i64 0}
!19 = !{!"int", !20, i64 0}
!20 = !{!"omnipotent char", !21, i64 0}
!21 = !{!"Simple C/C++ TBAA"}
!22 = !DILocation(line: 3, column: 1, scope: !8)
!23 = distinct !DISubprogram(name: "main", scope: !1, file: !1, line: 5, type: !24, isLocal: false, isDefinition: true, scopeLine: 5, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !29)
!24 = !DISubroutineType(types: !25)
!25 = !{!12, !12, !26}
!26 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !27, size: 64)
!27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !28, size: 64)
!28 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!29 = !{!30, !31, !32}
!30 = !DILocalVariable(name: "argc", arg: 1, scope: !23, file: !1, line: 5, type: !12)
!31 = !DILocalVariable(name: "argv", arg: 2, scope: !23, file: !1, line: 5, type: !26)
!32 = !DILocalVariable(name: "array", scope: !23, file: !1, line: 6, type: !33)
!33 = !DICompositeType(tag: DW_TAG_array_type, baseType: !12, size: 128, elements: !34)
!34 = !{!35}
!35 = !DISubrange(count: 4)
!36 = !DILocation(line: 5, column: 14, scope: !23)
!37 = !DILocation(line: 5, column: 27, scope: !23)
!38 = !DILocation(line: 6, column: 3, scope: !23)
!39 = !DILocation(line: 6, column: 7, scope: !23)
!40 = !DILocation(line: 7, column: 5, scope: !23)
!41 = !DILocation(line: 7, column: 3, scope: !23)
!42 = !DILocation(line: 8, column: 10, scope: !23)
!43 = !DILocation(line: 9, column: 1, scope: !23)
!44 = !DILocation(line: 8, column: 3, scope: !23)
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