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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
76 lines
3.1 KiB
LLVM
76 lines
3.1 KiB
LLVM
; RUN: llc -O0 %s -mtriple=aarch64 -o - | FileCheck %s
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; Test that a DEBUG_VALUE node is create for variable c after the phi has been
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; converted to a ldr. The DEBUG_VALUE must be *after* the ldr and not before it.
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; Created from the C code, compiled with -O0 -g and then passed through opt -mem2reg:
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;
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; int func(int a)
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; {
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; int c = 1;
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; if (a < 0 ) {
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; c = 12;
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; }
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; return c;
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; }
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;
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; Function Attrs: nounwind
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define i32 @func(i32) #0 !dbg !8 {
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call void @llvm.dbg.value(metadata i32 %0, i64 0, metadata !12, metadata !13), !dbg !14
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call void @llvm.dbg.value(metadata i32 1, i64 0, metadata !15, metadata !13), !dbg !16
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%2 = icmp slt i32 %0, 0, !dbg !17
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br i1 %2, label %3, label %4, !dbg !19
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; <label>:3: ; preds = %1
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call void @llvm.dbg.value(metadata i32 12, i64 0, metadata !15, metadata !13), !dbg !16
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br label %4, !dbg !20
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; <label>:4: ; preds = %3, %1
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%.0 = phi i32 [ 12, %3 ], [ 1, %1 ]
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; CHECK: ldr w[[REG:[0-9]+]], [sp, #8]
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; CHECK-NEXT: .Ltmp
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call void @llvm.dbg.value(metadata i32 %.0, i64 0, metadata !15, metadata !13), !dbg !16
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; CHECK-NEXT: //DEBUG_VALUE: func:c <- $w[[REG]]
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%5 = add nsw i32 %.0, %0, !dbg !22
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call void @llvm.dbg.value(metadata i32 %5, i64 0, metadata !15, metadata !13), !dbg !16
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ret i32 %5, !dbg !23
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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 readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #1
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attributes #0 = { nounwind }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "a.c", directory: "/tmp")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 4}
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!6 = !{i32 1, !"min_enum_size", i32 4}
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!7 = !{!"clang"}
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!8 = distinct !DISubprogram(name: "func", scope: !1, file: !1, line: 1, type: !9, isLocal: false, isDefinition: true, scopeLine: 2, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!9 = !DISubroutineType(types: !10)
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!10 = !{!11, !11}
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!11 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!12 = !DILocalVariable(name: "a", arg: 1, scope: !8, file: !1, line: 1, type: !11)
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!13 = !DIExpression()
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!14 = !DILocation(line: 1, column: 14, scope: !8)
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!15 = !DILocalVariable(name: "c", scope: !8, file: !1, line: 3, type: !11)
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!16 = !DILocation(line: 3, column: 13, scope: !8)
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!17 = !DILocation(line: 4, column: 15, scope: !18)
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!18 = distinct !DILexicalBlock(scope: !8, file: !1, line: 4, column: 13)
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!19 = !DILocation(line: 4, column: 13, scope: !8)
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!20 = !DILocation(line: 6, column: 9, scope: !21)
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!21 = distinct !DILexicalBlock(scope: !18, file: !1, line: 4, column: 21)
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!22 = !DILocation(line: 7, column: 4, scope: !8)
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!23 = !DILocation(line: 8, column: 9, scope: !8)
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