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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
91 lines
4.6 KiB
LLVM
91 lines
4.6 KiB
LLVM
; RUN: llc -mtriple=mips64-unknown-freebsd -target-abi n64 -relocation-model pic -verify-machineinstrs -o /dev/null %s -O2
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; Test that the presence of debug information does not cause the branch folder
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; to rewrite branches to have negative basic block ids, which would cause the
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; long branch pass to crash.
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@c = external global i32, align 4
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define void @e() !dbg !19 {
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entry:
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%0 = load i32, i32* @c, align 4, !dbg !28, !tbaa !31
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%tobool8 = icmp eq i32 %0, 0, !dbg !35
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br i1 %tobool8, label %for.end, label %for.body.preheader, !dbg !35
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for.body.preheader: ; preds = %entry
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br label %for.body, !dbg !36
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for.body: ; preds = %for.body.preheader
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%1 = load i8, i8* undef, align 1, !dbg !36, !tbaa !38
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%conv = zext i8 %1 to i32, !dbg !36
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%cmp = icmp sgt i32 %0, %conv, !dbg !39
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br i1 %cmp, label %if.end, label %if.then, !dbg !40
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if.then: ; preds = %for.body
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tail call void @llvm.dbg.value(metadata i32 %conv, metadata !41, metadata !DIExpression()), !dbg !43
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%idxprom5 = zext i8 %1 to i64, !dbg !44
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%call = tail call i32 bitcast (i32 (...)* @g to i32 (i32)*)(i32 signext undef) #3, !dbg !45
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br label %if.end, !dbg !46
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if.end: ; preds = %if.then, %for.body
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unreachable
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for.end: ; preds = %entry
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ret void
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}
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declare i32 @g(...)
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declare void @llvm.dbg.value(metadata, metadata, metadata)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!17, !18}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3)
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!1 = !DIFile(filename: "/local/scratch/alr48/cheri/llvm/tools/clang/test/CodeGen/<stdin>", directory: "/local/scratch/alr48/cheri/llvm/cmake-build-debug/tools/clang/test/CodeGen")
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!2 = !{}
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!3 = !{!4, !9, !13, !15}
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!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
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!5 = distinct !DIGlobalVariable(name: "a", scope: !0, file: !6, line: 6, type: !7, isLocal: false, isDefinition: true)
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!6 = !DIFile(filename: "/crash.c", directory: "/tmp")
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!7 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !8, size: 64)
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!8 = !DIBasicType(name: "unsigned char", size: 8, encoding: DW_ATE_unsigned_char)
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!9 = !DIGlobalVariableExpression(var: !10, expr: !DIExpression())
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!10 = distinct !DIGlobalVariable(name: "b", scope: !0, file: !6, line: 7, type: !11, isLocal: false, isDefinition: true)
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!11 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !12, size: 64)
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!12 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!13 = !DIGlobalVariableExpression(var: !14, expr: !DIExpression())
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!14 = distinct !DIGlobalVariable(name: "c", scope: !0, file: !6, line: 8, type: !12, isLocal: false, isDefinition: true)
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!15 = !DIGlobalVariableExpression(var: !16, expr: !DIExpression())
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!16 = distinct !DIGlobalVariable(name: "d", scope: !0, file: !6, line: 8, type: !12, isLocal: false, isDefinition: true)
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!17 = !{i32 2, !"Debug Info Version", i32 3}
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!18 = !{i32 7, !"PIC Level", i32 2}
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!19 = distinct !DISubprogram(name: "e", scope: !6, file: !6, line: 9, type: !20, isLocal: false, isDefinition: true, scopeLine: 9, isOptimized: true, unit: !0, retainedNodes: !22)
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!20 = !DISubroutineType(types: !21)
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!21 = !{!12}
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!22 = !{!23}
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!23 = !DILocalVariable(name: "f", scope: !24, file: !6, line: 12, type: !12)
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!24 = distinct !DILexicalBlock(scope: !25, file: !6, line: 11, column: 20)
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!25 = distinct !DILexicalBlock(scope: !26, file: !6, line: 11, column: 9)
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!26 = distinct !DILexicalBlock(scope: !27, file: !6, line: 10, column: 3)
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!27 = distinct !DILexicalBlock(scope: !19, file: !6, line: 10, column: 3)
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!28 = !DILocation(line: 10, column: 10, scope: !29)
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!29 = distinct !DILexicalBlock(scope: !30, file: !6, line: 10, column: 3)
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!30 = distinct !DILexicalBlock(scope: !19, file: !6, line: 10, column: 3)
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!31 = !{!32, !32, i64 0}
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!32 = !{!"int", !33, i64 0}
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!33 = !{!"omnipotent char", !34, i64 0}
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!34 = !{!"Simple C/C++ TBAA"}
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!35 = !DILocation(line: 10, column: 3, scope: !30)
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!36 = !DILocation(line: 11, column: 9, scope: !37)
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!37 = distinct !DILexicalBlock(scope: !29, file: !6, line: 11, column: 9)
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!38 = !{!33, !33, i64 0}
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!39 = !DILocation(line: 11, column: 14, scope: !37)
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!40 = !DILocation(line: 11, column: 9, scope: !29)
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!41 = !DILocalVariable(name: "f", scope: !42, file: !6, line: 12, type: !12)
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!42 = distinct !DILexicalBlock(scope: !37, file: !6, line: 11, column: 20)
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!43 = !DILocation(line: 12, column: 11, scope: !42)
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!44 = !DILocation(line: 13, column: 9, scope: !42)
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!45 = !DILocation(line: 13, column: 7, scope: !42)
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!46 = !DILocation(line: 14, column: 5, scope: !42)
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