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a2029fa58e
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
120 lines
4.8 KiB
LLVM
120 lines
4.8 KiB
LLVM
; RUN: llc -mtriple=x86_64-apple-darwin %s -o %t.o -filetype=obj -O0
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; RUN: llvm-dwarfdump -v %t.o | FileCheck %s
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;
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; Test that on x86_64, the 32-bit subregister esi is emitted as
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; subregister of the 64-bit rsi.
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;
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; rdar://problem/16015314
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;
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; CHECK: .debug_info contents:
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_location [DW_FORM_data4] (
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; CHECK-NEXT: [{{.*}}, {{.*}}): DW_OP_reg4 RSI)
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; CHECK-NEXT: DW_AT_name [DW_FORM_strp]{{.*}} "a"
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;
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; struct bar {
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; int a;
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; int b;
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; };
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;
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; void doSomething() __attribute__ ((noinline));
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;
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; void doSomething(struct bar *b)
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; {
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; int a = b->a;
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; printf("%d\n", a); // set breakpoint here
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; }
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;
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; int main()
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; {
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; struct bar myBar = { 3, 4 };
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; doSomething(&myBar);
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; return 0;
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; }
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.9.0"
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%struct.bar = type { i32, i32 }
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@.str = private unnamed_addr constant [4 x i8] c"%d\0A\00", align 1
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@main.myBar = private unnamed_addr constant %struct.bar { i32 3, i32 4 }, align 4
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; Function Attrs: noinline nounwind ssp uwtable
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define void @doSomething(%struct.bar* nocapture readonly %b) #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata %struct.bar* %b, metadata !15, metadata !DIExpression()), !dbg !25
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%a1 = getelementptr inbounds %struct.bar, %struct.bar* %b, i64 0, i32 0, !dbg !26
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%0 = load i32, i32* %a1, align 4, !dbg !26, !tbaa !27
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tail call void @llvm.dbg.value(metadata i32 %0, metadata !16, metadata !DIExpression()), !dbg !26
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%call = tail call i32 (i8*, ...) @printf(i8* getelementptr inbounds ([4 x i8], [4 x i8]* @.str, i64 0, i64 0), i32 %0) #4, !dbg !32
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ret void, !dbg !33
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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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; Function Attrs: nounwind
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declare i32 @printf(i8* nocapture readonly, ...) #2
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; Function Attrs: nounwind ssp uwtable
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define i32 @main() #3 !dbg !17 {
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entry:
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%myBar = alloca i64, align 8, !dbg !34
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%tmpcast = bitcast i64* %myBar to %struct.bar*, !dbg !34
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tail call void @llvm.dbg.declare(metadata %struct.bar* %tmpcast, metadata !21, metadata !DIExpression()), !dbg !34
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store i64 17179869187, i64* %myBar, align 8, !dbg !34
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call void @doSomething(%struct.bar* %tmpcast), !dbg !35
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ret i32 0, !dbg !36
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { noinline nounwind ssp uwtable }
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attributes #1 = { nounwind readnone }
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attributes #2 = { nounwind }
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attributes #3 = { nounwind ssp uwtable }
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attributes #4 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!22, !23}
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!llvm.ident = !{!24}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.5 ", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "subregisters.c", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "doSomething", line: 10, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 11, file: !1, scope: !5, type: !6, retainedNodes: !14)
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!5 = !DIFile(filename: "subregisters.c", directory: "")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null, !8}
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!8 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !9)
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!9 = !DICompositeType(tag: DW_TAG_structure_type, name: "bar", line: 3, size: 64, align: 32, file: !1, elements: !10)
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!10 = !{!11, !13}
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!11 = !DIDerivedType(tag: DW_TAG_member, name: "a", line: 4, size: 32, align: 32, file: !1, scope: !9, baseType: !12)
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!12 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "b", line: 5, size: 32, align: 32, offset: 32, file: !1, scope: !9, baseType: !12)
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!14 = !{!15, !16}
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!15 = !DILocalVariable(name: "b", line: 10, arg: 1, scope: !4, file: !5, type: !8)
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!16 = !DILocalVariable(name: "a", line: 12, scope: !4, file: !5, type: !12)
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!17 = distinct !DISubprogram(name: "main", line: 16, isLocal: false, isDefinition: true, virtualIndex: 6, isOptimized: true, unit: !0, scopeLine: 17, file: !1, scope: !5, type: !18, retainedNodes: !20)
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!18 = !DISubroutineType(types: !19)
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!19 = !{!12}
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!20 = !{!21}
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!21 = !DILocalVariable(name: "myBar", line: 18, scope: !17, file: !5, type: !9)
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!22 = !{i32 2, !"Dwarf Version", i32 2}
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!23 = !{i32 1, !"Debug Info Version", i32 3}
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!24 = !{!"clang version 3.5 "}
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!25 = !DILocation(line: 10, scope: !4)
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!26 = !DILocation(line: 12, scope: !4)
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!27 = !{!28, !29, i64 0}
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!28 = !{!"bar", !29, i64 0, !29, i64 4}
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!29 = !{!"int", !30, i64 0}
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!30 = !{!"omnipotent char", !31, i64 0}
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!31 = !{!"Simple C/C++ TBAA"}
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!32 = !DILocation(line: 13, scope: !4)
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!33 = !DILocation(line: 14, scope: !4)
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!34 = !DILocation(line: 18, scope: !17)
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!35 = !DILocation(line: 19, scope: !17)
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!36 = !DILocation(line: 20, scope: !17)
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