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
81 lines
3.9 KiB
LLVM
81 lines
3.9 KiB
LLVM
; RUN: llc < %s -mcpu=generic -mtriple=i386-apple-darwin -no-integrated-as
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source_filename = "test/CodeGen/X86/fpstack-debuginstr-kill.ll"
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@g1 = global double 0.000000e+00, align 8, !dbg !0
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@g2 = global i32 0, align 4, !dbg !7
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define void @_Z16fpuop_arithmeticjj(i32, i32) !dbg !16 {
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entry:
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switch i32 undef, label %sw.bb.i1921 [
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]
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sw.bb261: ; No predecessors!
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unreachable
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sw.bb.i1921: ; preds = %entry
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switch i32 undef, label %if.end511 [
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i32 1, label %sw.bb27.i
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]
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sw.bb27.i: ; preds = %sw.bb.i1921
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%conv.i.i1923 = fpext float undef to x86_fp80
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br label %if.end511
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if.end511: ; preds = %sw.bb27.i, %sw.bb.i1921
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%src.sroa.0.0.src.sroa.0.0.2280 = phi x86_fp80 [ %conv.i.i1923, %sw.bb27.i ], [ undef, %sw.bb.i1921 ]
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switch i32 undef, label %sw.bb992 [
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i32 3, label %sw.bb735
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i32 18, label %if.end41.i2210
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]
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sw.bb735: ; preds = %if.end511
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%2 = call x86_fp80 asm sideeffect "frndint", "={st},0,~{dirflag},~{fpsr},~{flags}"(x86_fp80 %src.sroa.0.0.src.sroa.0.0.2280)
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unreachable
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if.end41.i2210: ; preds = %if.end511
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call void @llvm.dbg.value(metadata x86_fp80 %src.sroa.0.0.src.sroa.0.0.2280, i64 0, metadata !25, metadata !26), !dbg !27
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unreachable
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sw.bb992: ; preds = %if.end511
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ret void
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, i64, metadata, metadata) #0
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attributes #0 = { nounwind readnone }
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!llvm.dbg.cu = !{!10}
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!llvm.module.flags = !{!14, !15}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = !DIGlobalVariable(name: "g1", scope: null, file: !2, line: 5, type: !3, isLocal: false, isDefinition: true)
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!2 = !DIFile(filename: "f1.cpp", directory: "x87stackifier")
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!3 = !DIDerivedType(tag: DW_TAG_typedef, name: "fpu_extended", file: !2, line: 3, baseType: !4)
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!4 = !DIDerivedType(tag: DW_TAG_typedef, name: "fpu_register", file: !2, line: 2, baseType: !5)
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!5 = !DIDerivedType(tag: DW_TAG_typedef, name: "uae_f64", file: !2, line: 1, baseType: !6)
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!6 = !DIBasicType(name: "long double", size: 128, align: 128, encoding: DW_ATE_float)
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!7 = !DIGlobalVariableExpression(var: !8, expr: !DIExpression())
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!8 = !DIGlobalVariable(name: "g2", scope: null, file: !2, line: 6, type: !9, isLocal: false, isDefinition: true)
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!9 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!10 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, file: !11, producer: "clang version 3.6.0 (http://llvm.org/git/clang 8444ae7cfeaefae031f8fedf0d1435ca3b14d90b) (http://llvm.org/git/llvm 886f0101a7d176543b831f5efb74c03427244a55)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !12, retainedTypes: !12, globals: !13, imports: !12)
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!11 = !DIFile(filename: "fpu_ieee.cpp", directory: "x87stackifier")
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!12 = !{}
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!13 = !{!0, !7}
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!14 = !{i32 2, !"Dwarf Version", i32 2}
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!15 = !{i32 2, !"Debug Info Version", i32 3}
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!16 = distinct !DISubprogram(name: "fpuop_arithmetic", linkageName: "_Z16fpuop_arithmeticjj", scope: !2, file: !2, line: 11, type: !17, isLocal: false, isDefinition: true, scopeLine: 13, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !10, retainedNodes: !20)
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!17 = !DISubroutineType(types: !18)
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!18 = !{null, !19, !19}
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!19 = !DIBasicType(name: "unsigned int", size: 32, align: 32, encoding: DW_ATE_unsigned)
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!20 = !{!21, !22, !23, !24, !25}
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!21 = !DILocalVariable(arg: 1, scope: !16, file: !2, line: 11, type: !19)
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!22 = !DILocalVariable(arg: 2, scope: !16, file: !2, line: 11, type: !19)
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!23 = !DILocalVariable(name: "x", scope: !16, file: !2, line: 14, type: !3)
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!24 = !DILocalVariable(name: "a", scope: !16, file: !2, line: 15, type: !9)
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!25 = !DILocalVariable(name: "value", scope: !16, file: !2, line: 16, type: !3)
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!26 = !DIExpression()
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!27 = !DILocation(line: 0, scope: !16)
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