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clang-p2996/llvm/test/DebugInfo/X86/align_cpp11.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

176 lines
7.2 KiB
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; RUN: %llc_dwarf -filetype=obj < %s | llvm-dwarfdump -debug-info - | FileCheck %s
; REQUIRES: object-emission
; Generated by clang++ -c -g -std=c++11 -S -emit-llvm from the following C++11 source
; struct S {
; char x;
; alignas(128) char xx;
; };
;
; class alignas(64) C0 {
; };
;
; class C1 {
; alignas(64) static void *p;
; };
;
; enum alignas(16) E {
; A,
; B,
; C,
; };
;
; C0 c0;
;
; alignas(2048) S s;
;
; void foo()
; {
; S ss;
; E e;
; C1 c1;
; alignas(32) int i = 42;
; auto Lambda = [i](){};
; }
; CHECK: DW_TAG_class_type
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name{{.*}}"C0"
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_alignment{{.*}}64
; CHECK: DW_TAG_variable
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name{{.*}}"s"
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_alignment{{.*}}2048
; CHECK: DW_TAG_structure_type
; CHECK: DW_TAG_member
; CHECK: DW_AT_name{{.*}}"xx"
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_alignment{{.*}}128
; CHECK: DW_TAG_enumeration_type
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_alignment{{.*}}16
; CHECK: DW_TAG_variable
; CHECK: DW_AT_name{{.*}}"i"
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_alignment{{.*}}32
; CHECK: DW_TAG_class_type
; CHECK: DW_TAG_member
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name{{.*}}"i"
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_alignment{{.*}}32
; CHECK: DW_TAG_class_type
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name{{.*}}"C1"
; CHECK: DW_TAG_member
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_name{{.*}}"p"
; CHECK-NOT: DW_TAG
; CHECK: DW_AT_alignment{{.*}}64
; ModuleID = 'test.cpp'
source_filename = "test.cpp"
target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
target triple = "x86_64-unknown-linux-gnu"
%class.C0 = type { [64 x i8] }
%struct.S = type { i8, [127 x i8], i8, [127 x i8] }
%class.C1 = type { i8 }
%class.anon = type { i32 }
@c0 = global %class.C0 zeroinitializer, align 64, !dbg !0
@s = global %struct.S zeroinitializer, align 2048, !dbg !12
; Function Attrs: nounwind uwtable
define void @_Z3foov() #0 !dbg !24 {
entry:
%ss = alloca %struct.S, align 128
%e = alloca i32, align 16
%c1 = alloca %class.C1, align 1
%i = alloca i32, align 32
%Lambda = alloca %class.anon, align 4
call void @llvm.dbg.declare(metadata %struct.S* %ss, metadata !27, metadata !28), !dbg !29
call void @llvm.dbg.declare(metadata i32* %e, metadata !30, metadata !28), !dbg !31
call void @llvm.dbg.declare(metadata %class.C1* %c1, metadata !32, metadata !28), !dbg !37
call void @llvm.dbg.declare(metadata i32* %i, metadata !38, metadata !28), !dbg !40
store i32 42, i32* %i, align 32, !dbg !40
call void @llvm.dbg.declare(metadata %class.anon* %Lambda, metadata !41, metadata !28), !dbg !50
%0 = getelementptr inbounds %class.anon, %class.anon* %Lambda, i32 0, i32 0, !dbg !51
%1 = load i32, i32* %i, align 32, !dbg !52
store i32 %1, i32* %0, align 4, !dbg !51
ret void, !dbg !53
}
; Function Attrs: nounwind readnone
declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
attributes #0 = { nounwind uwtable }
attributes #1 = { nounwind readnone }
!llvm.dbg.cu = !{!2}
!llvm.module.flags = !{!21, !22}
!llvm.ident = !{!23}
!0 = distinct !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
!1 = !DIGlobalVariable(name: "c0", scope: !2, file: !6, line: 19, type: !19, isLocal: false, isDefinition: true)
!2 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !3, producer: "clang version 4.0.0 (http://llvm.org/git/clang.git 9ce5220b821054019059c2ac4a9b132c7723832d) (http://llvm.org/git/llvm.git 9a6298be89ce0359b151c0a37af2776a12c69e85)", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !11)
!3 = !DIFile(filename: "test.cpp", directory: "/tmp")
!4 = !{!5}
!5 = !DICompositeType(tag: DW_TAG_enumeration_type, name: "E", file: !6, line: 13, size: 32, align: 128, elements: !7, identifier: "_ZTS1E")
!6 = !DIFile(filename: "./test.cpp", directory: "/tmp")
!7 = !{!8, !9, !10}
!8 = !DIEnumerator(name: "A", value: 0)
!9 = !DIEnumerator(name: "B", value: 1)
!10 = !DIEnumerator(name: "C", value: 2)
!11 = !{!0, !12}
!12 = distinct !DIGlobalVariableExpression(var: !13, expr: !DIExpression())
!13 = !DIGlobalVariable(name: "s", scope: !2, file: !6, line: 21, type: !14, isLocal: false, isDefinition: true, align: 16384)
!14 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S", file: !6, line: 1, size: 2048, elements: !15, identifier: "_ZTS1S")
!15 = !{!16, !18}
!16 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !14, file: !6, line: 2, baseType: !17, size: 8)
!17 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
!18 = !DIDerivedType(tag: DW_TAG_member, name: "xx", scope: !14, file: !6, line: 3, baseType: !17, size: 8, align: 1024, offset: 1024)
!19 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "C0", file: !6, line: 6, size: 512, align: 512, elements: !20, identifier: "_ZTS2C0")
!20 = !{}
!21 = !{i32 2, !"Dwarf Version", i32 4}
!22 = !{i32 2, !"Debug Info Version", i32 3}
!23 = !{!"clang version 4.0.0 (http://llvm.org/git/clang.git 9ce5220b821054019059c2ac4a9b132c7723832d) (http://llvm.org/git/llvm.git 9a6298be89ce0359b151c0a37af2776a12c69e85)"}
!24 = distinct !DISubprogram(name: "foo", linkageName: "_Z3foov", scope: !6, file: !6, line: 23, type: !25, isLocal: false, isDefinition: true, scopeLine: 24, flags: DIFlagPrototyped, isOptimized: false, unit: !2, retainedNodes: !20)
!25 = !DISubroutineType(types: !26)
!26 = !{null}
!27 = !DILocalVariable(name: "ss", scope: !24, file: !6, line: 25, type: !14)
!28 = !DIExpression()
!29 = !DILocation(line: 25, column: 7, scope: !24)
!30 = !DILocalVariable(name: "e", scope: !24, file: !6, line: 26, type: !5)
!31 = !DILocation(line: 26, column: 7, scope: !24)
!32 = !DILocalVariable(name: "c1", scope: !24, file: !6, line: 27, type: !33)
!33 = distinct !DICompositeType(tag: DW_TAG_class_type, name: "C1", file: !6, line: 9, size: 8, elements: !34, identifier: "_ZTS2C1")
!34 = !{!35}
!35 = !DIDerivedType(tag: DW_TAG_member, name: "p", scope: !33, file: !6, line: 10, baseType: !36, align: 512, flags: DIFlagStaticMember)
!36 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: null, size: 64)
!37 = !DILocation(line: 27, column: 8, scope: !24)
!38 = !DILocalVariable(name: "i", scope: !24, file: !6, line: 28, type: !39, align: 256)
!39 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
!40 = !DILocation(line: 28, column: 21, scope: !24)
!41 = !DILocalVariable(name: "Lambda", scope: !24, file: !6, line: 29, type: !42)
!42 = distinct !DICompositeType(tag: DW_TAG_class_type, scope: !24, file: !6, line: 29, size: 32, elements: !43)
!43 = !{!44, !45}
!44 = !DIDerivedType(tag: DW_TAG_member, name: "i", scope: !42, file: !6, line: 29, baseType: !39, size: 32, align: 256)
!45 = !DISubprogram(name: "operator()", scope: !42, file: !6, line: 29, type: !46, isLocal: false, isDefinition: false, scopeLine: 29, flags: DIFlagPublic | DIFlagPrototyped, isOptimized: false)
!46 = !DISubroutineType(types: !47)
!47 = !{null, !48}
!48 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !49, size: 64, flags: DIFlagArtificial | DIFlagObjectPointer)
!49 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !42)
!50 = !DILocation(line: 29, column: 10, scope: !24)
!51 = !DILocation(line: 29, column: 19, scope: !24)
!52 = !DILocation(line: 29, column: 20, scope: !24)
!53 = !DILocation(line: 30, column: 1, scope: !24)
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