2017-09-12 06:59:45 +08:00
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; RUN: %llc_dwarf -filetype=obj < %s | llvm-dwarfdump -debug-info - | FileCheck %s
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2016-10-26 19:59:03 +08:00
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; REQUIRES: object-emission
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; Generated by clang -c -g -std=c11 -S -emit-llvm from the following C11 source
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;
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; // every object of type struct data will be aligned to 128-byte boundary
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; struct data {
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; char x;
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; _Alignas(128) char arr[2];
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; };
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;
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; _Alignas(2048) struct data d; // this instance of data is aligned even stricter
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; int foo(void)
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; {
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; struct data local_data;
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; return 0;
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; }
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; CHECK: DW_TAG_variable
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name{{.*}}"d"
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_alignment{{.*}}2048
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; CHECK: DW_TAG_structure_type
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; CHECK: DW_TAG_member
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; CHECK: DW_TAG_member
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name{{.*}}"arr"
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_alignment{{.*}}128
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; ModuleID = 'test.c'
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source_filename = "test.c"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-unknown-linux-gnu"
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%struct.data = type { i8, [127 x i8], [2 x i8], [126 x i8] }
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@d = common global %struct.data zeroinitializer, align 2048, !dbg !0
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; Function Attrs: nounwind uwtable
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define i32 @foo() #0 !dbg !17 {
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entry:
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%local_data = alloca %struct.data, align 128
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call void @llvm.dbg.declare(metadata %struct.data* %local_data, metadata !21, metadata !22), !dbg !23
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ret i32 0, !dbg !24
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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 }
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attributes #1 = { nounwind readnone }
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2016-12-22 08:45:21 +08:00
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!llvm.dbg.cu = !{!2}
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2016-10-26 19:59:03 +08:00
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!llvm.module.flags = !{!14, !15}
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!llvm.ident = !{!16}
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2017-08-31 02:06:51 +08:00
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!0 = distinct !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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2016-12-22 08:45:21 +08:00
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!1 = !DIGlobalVariable(name: "d", scope: !2, file: !3, line: 7, type: !6, isLocal: false, isDefinition: true, align: 16384)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, 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: !5)
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!3 = !DIFile(filename: "test.c", directory: "/tmp")
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!4 = !{}
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!5 = !{!0}
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!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "data", file: !3, line: 2, size: 2048, elements: !7)
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2016-10-26 19:59:03 +08:00
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!7 = !{!8, !10}
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2016-12-22 08:45:21 +08:00
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!8 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !6, file: !3, line: 3, baseType: !9, size: 8)
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2016-10-26 19:59:03 +08:00
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!9 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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2016-12-22 08:45:21 +08:00
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!10 = !DIDerivedType(tag: DW_TAG_member, name: "arr", scope: !6, file: !3, line: 4, baseType: !11, size: 16, align: 1024, offset: 1024)
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2016-10-26 19:59:03 +08:00
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!11 = !DICompositeType(tag: DW_TAG_array_type, baseType: !9, size: 16, elements: !12)
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!12 = !{!13}
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!13 = !DISubrange(count: 2)
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!14 = !{i32 2, !"Dwarf Version", i32 4}
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!15 = !{i32 2, !"Debug Info Version", i32 3}
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!16 = !{!"clang version 4.0.0 (http://llvm.org/git/clang.git 9ce5220b821054019059c2ac4a9b132c7723832d) (http://llvm.org/git/llvm.git 9a6298be89ce0359b151c0a37af2776a12c69e85)"}
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[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 10:40:45 +08:00
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!17 = distinct !DISubprogram(name: "foo", scope: !3, file: !3, line: 8, type: !18, isLocal: false, isDefinition: true, scopeLine: 9, flags: DIFlagPrototyped, isOptimized: false, unit: !2, retainedNodes: !4)
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2016-10-26 19:59:03 +08:00
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!18 = !DISubroutineType(types: !19)
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!19 = !{!20}
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!20 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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2016-12-22 08:45:21 +08:00
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!21 = !DILocalVariable(name: "local_data", scope: !17, file: !3, line: 10, type: !6)
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2016-10-26 19:59:03 +08:00
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!22 = !DIExpression()
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!23 = !DILocation(line: 10, column: 17, scope: !17)
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!24 = !DILocation(line: 11, column: 5, scope: !17)
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2016-12-22 08:45:21 +08:00
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