2c864551df
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
114 lines
4.6 KiB
LLVM
114 lines
4.6 KiB
LLVM
; REQUIRES: object-emission
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; Check that when variables are allocated on the stack we generate debug locations
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; for the stack location directly instead of generating a register+offset indirection.
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; RUN: llc -O2 -filetype=obj -disable-post-ra -mtriple=x86_64-unknown-linux-gnu < %s \
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; RUN: | llvm-dwarfdump -v - | FileCheck %s
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;
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; int data = 17;
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; int sum = 0;
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; int zero = 0;
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; int *ptr;
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;
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; extern void foo(int i, int *p);
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;
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; int main()
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; {
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; int val;
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; val = data;
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; foo(1, &val);
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; foo(2, &data);
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; return zero;
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; }
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;
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; CHECK: .debug_info contents
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; CHECK: DW_TAG_subprogram
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; CHECK-NOT: NULL
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; CHECK: DW_TAG_variable
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; CHECK: DW_AT_location [DW_FORM_sec_offset] ({{.*}}
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; CHECK-NEXT: [{{0x.*}}, {{0x.*}}): DW_OP_reg0 RAX
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; CHECK-NEXT: [{{0x.*}}, {{0x.*}}): DW_OP_breg7 RSP+4, DW_OP_deref)
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; CHECK-NEXT: DW_AT_name {{.*}}"val"
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; ModuleID = 'frame.c'
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source_filename = "frame.c"
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@data = global i32 17, align 4, !dbg !0
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@sum = local_unnamed_addr global i32 0, align 4, !dbg !6
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@zero = local_unnamed_addr global i32 0, align 4, !dbg !9
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@ptr = common local_unnamed_addr global i32* null, align 8, !dbg !11
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define i32 @main() local_unnamed_addr !dbg !17 {
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entry:
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%val = alloca i32, align 4
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%0 = bitcast i32* %val to i8*, !dbg !22
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call void @llvm.lifetime.start(i64 4, i8* %0), !dbg !22
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%1 = load i32, i32* @data, align 4, !dbg !23, !tbaa !24
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tail call void @llvm.dbg.value(metadata i32 %1, metadata !21, metadata !28), !dbg !29
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store i32 %1, i32* %val, align 4, !dbg !30, !tbaa !24
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tail call void @llvm.dbg.value(metadata i32* %val, metadata !21, metadata !31), !dbg !29
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call void @foo(i32 1, i32* nonnull %val), !dbg !32
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call void @foo(i32 2, i32* nonnull @data), !dbg !33
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%2 = load i32, i32* @zero, align 4, !dbg !34, !tbaa !24
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call void @llvm.lifetime.end(i64 4, i8* %0), !dbg !35
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ret i32 %2, !dbg !36
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}
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.start(i64, i8* nocapture) #0
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declare void @foo(i32, i32*) local_unnamed_addr
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; Function Attrs: argmemonly nounwind
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declare void @llvm.lifetime.end(i64, i8* nocapture) #0
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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 = { argmemonly nounwind }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!14, !15}
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!llvm.ident = !{!16}
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!0 = distinct !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = !DIGlobalVariable(name: "data", scope: !2, file: !3, line: 1, type: !8, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 3.9.0 (trunk 273961)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "frame.c", directory: "/home/user/test")
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!4 = !{}
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!5 = !{!0, !6, !9, !11}
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!6 = distinct !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
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!7 = !DIGlobalVariable(name: "sum", scope: !2, file: !3, line: 2, type: !8, isLocal: false, isDefinition: true)
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!8 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = distinct !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
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!10 = !DIGlobalVariable(name: "zero", scope: !2, file: !3, line: 3, type: !8, isLocal: false, isDefinition: true)
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!11 = distinct !DIGlobalVariableExpression(var: !12, expr: !DIExpression())
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!12 = !DIGlobalVariable(name: "ptr", scope: !2, file: !3, line: 4, type: !13, isLocal: false, isDefinition: true)
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!13 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64, align: 64)
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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 3.9.0 (trunk 273961)"}
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!17 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 8, type: !18, isLocal: false, isDefinition: true, scopeLine: 9, isOptimized: true, unit: !2, retainedNodes: !20)
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!18 = !DISubroutineType(types: !19)
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!19 = !{!8}
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!20 = !{!21}
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!21 = !DILocalVariable(name: "val", scope: !17, file: !3, line: 10, type: !8)
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!22 = !DILocation(line: 10, column: 3, scope: !17)
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!23 = !DILocation(line: 11, column: 9, scope: !17)
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!24 = !{!25, !25, i64 0}
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!25 = !{!"int", !26, i64 0}
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!26 = !{!"omnipotent char", !27, i64 0}
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!27 = !{!"Simple C/C++ TBAA"}
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!28 = !DIExpression()
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!29 = !DILocation(line: 10, column: 7, scope: !17)
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!30 = !DILocation(line: 11, column: 7, scope: !17)
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!31 = !DIExpression(DW_OP_deref)
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!32 = !DILocation(line: 12, column: 3, scope: !17)
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!33 = !DILocation(line: 13, column: 3, scope: !17)
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!34 = !DILocation(line: 14, column: 10, scope: !17)
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!35 = !DILocation(line: 15, column: 1, scope: !17)
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!36 = !DILocation(line: 14, column: 3, scope: !17)
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