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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
65 lines
2.8 KiB
LLVM
65 lines
2.8 KiB
LLVM
; RUN: llc -filetype=obj -o - %s | llvm-dwarfdump --name cntrl_flags - | FileCheck %s
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; CHECK: DW_OP_reg0 W0
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;
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; void use(unsigned char);
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; f(unsigned long long cntrl_flags,
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; int page_count)
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; {
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; unsigned char tag;
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; tag = (((cntrl_flags) >> 32) & 0xFF);
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; use(tag);
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; }
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source_filename = "test.i"
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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target triple = "arm64-apple-ios5.0.0"
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; Function Attrs: nounwind ssp uwtable
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define i32 @f(i64 %cntrl_flags) local_unnamed_addr #0 !dbg !8 {
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entry:
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tail call void @llvm.dbg.value(metadata i64 %cntrl_flags, metadata !14, metadata !DIExpression()), !dbg !18
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%shr = lshr i64 %cntrl_flags, 32, !dbg !20
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%conv = trunc i64 %shr to i8, !dbg !21
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tail call void @llvm.dbg.value(metadata i8 %conv, metadata !16, metadata !DIExpression()), !dbg !22
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tail call void @use(i8 zeroext %conv) #3, !dbg !23
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ret i32 undef, !dbg !24
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}
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declare void @use(i8 zeroext) local_unnamed_addr
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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attributes #0 = { nounwind ssp uwtable }
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attributes #2 = { nounwind readnone speculatable }
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attributes #3 = { nobuiltin nounwind }
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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 version 6.0.0 (trunk 317700) (llvm/trunk 317708)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.i", directory: "/")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 2}
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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 7, !"PIC Level", i32 2}
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!7 = !{!"clang version 6.0.0 (trunk 317700) (llvm/trunk 317708)"}
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!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 2, type: !9, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !13)
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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, encoding: DW_ATE_signed)
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!12 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!13 = !{!14, !16}
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!14 = !DILocalVariable(name: "cntrl_flags", arg: 1, scope: !8, file: !1, line: 2, type: !12)
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!16 = !DILocalVariable(name: "tag", scope: !8, file: !1, line: 5, type: !17)
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!17 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)
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!18 = !DILocation(line: 2, column: 22, scope: !8)
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!19 = !DILocation(line: 3, column: 31, scope: !8)
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!20 = !DILocation(line: 6, column: 24, scope: !8)
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!21 = !DILocation(line: 6, column: 8, scope: !8)
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!22 = !DILocation(line: 5, column: 16, scope: !8)
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!23 = !DILocation(line: 7, column: 2, scope: !8)
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!24 = !DILocation(line: 8, column: 1, scope: !8)
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