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
89 lines
4.7 KiB
LLVM
89 lines
4.7 KiB
LLVM
; RUN: opt < %s -basicaa -slp-vectorizer -dce -S -mtriple=x86_64-apple-macosx10.8.0 -mcpu=corei7-avx | FileCheck %s
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.7.0"
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; int depth(double *A, int m) {
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; double y0 = 0; double y1 = 1;
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; for (int i=0; i < m; i++) {
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; y0 = A[4];
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; y1 = A[5];
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; }
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; A[8] = y0; A[8+1] = y1;
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; }
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;CHECK: @depth
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;CHECK: getelementptr inbounds {{.*}}, !dbg ![[LOC:[0-9]+]]
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;CHECK: bitcast double* {{.*}}, !dbg ![[LOC]]
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;CHECK: load <2 x double>, <2 x double>* {{.*}}, !dbg ![[LOC]]
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;CHECK: store <2 x double> {{.*}}, !dbg ![[LOC2:[0-9]+]]
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;CHECK: ret
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;CHECK: ![[LOC]] = !DILocation(line: 4, scope:
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;CHECK: ![[LOC2]] = !DILocation(line: 7, scope:
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define i32 @depth(double* nocapture %A, i32 %m) #0 !dbg !4 {
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entry:
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tail call void @llvm.dbg.value(metadata double* %A, i64 0, metadata !12, metadata !DIExpression()), !dbg !19
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tail call void @llvm.dbg.value(metadata i32 %m, i64 0, metadata !13, metadata !DIExpression()), !dbg !19
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tail call void @llvm.dbg.value(metadata double 0.0, i64 0, metadata !14, metadata !DIExpression()), !dbg !21
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tail call void @llvm.dbg.value(metadata double 0.2, i64 0, metadata !15, metadata !DIExpression()), !dbg !21
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tail call void @llvm.dbg.value(metadata i32 0, i64 0, metadata !16, metadata !DIExpression()), !dbg !23
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%cmp8 = icmp sgt i32 %m, 0, !dbg !23
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br i1 %cmp8, label %for.body.lr.ph, label %for.end, !dbg !23
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for.body.lr.ph: ; preds = %entry
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%arrayidx = getelementptr inbounds double, double* %A, i64 4, !dbg !24
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%0 = load double, double* %arrayidx, align 8, !dbg !24
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%arrayidx1 = getelementptr inbounds double, double* %A, i64 5, !dbg !29
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%1 = load double, double* %arrayidx1, align 8, !dbg !29
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br label %for.end, !dbg !23
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for.end: ; preds = %for.body.lr.ph, %entry
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%y1.0.lcssa = phi double [ %1, %for.body.lr.ph ], [ 1.000000e+00, %entry ]
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%y0.0.lcssa = phi double [ %0, %for.body.lr.ph ], [ 0.000000e+00, %entry ]
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%arrayidx2 = getelementptr inbounds double, double* %A, i64 8, !dbg !30
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store double %y0.0.lcssa, double* %arrayidx2, align 8, !dbg !30
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%arrayidx3 = getelementptr inbounds double, double* %A, i64 9, !dbg !30
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store double %y1.0.lcssa, double* %arrayidx3, align 8, !dbg !30
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ret i32 undef, !dbg !31
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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) #1
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attributes #0 = { nounwind ssp uwtable "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf"="true" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!18, !32}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.4 (trunk 187335) (llvm/trunk 187335:187340M)", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "file.c", directory: "/Users/nadav")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "depth", line: 1, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 1, file: !1, scope: !5, type: !6, retainedNodes: !11)
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!5 = !DIFile(filename: "file.c", directory: "/Users/nadav")
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !9, !8}
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !10)
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!10 = !DIBasicType(tag: DW_TAG_base_type, name: "double", size: 64, align: 64, encoding: DW_ATE_float)
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!11 = !{!12, !13, !14, !15, !16}
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!12 = !DILocalVariable(name: "A", line: 1, arg: 1, scope: !4, file: !5, type: !9)
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!13 = !DILocalVariable(name: "m", line: 1, arg: 2, scope: !4, file: !5, type: !8)
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!14 = !DILocalVariable(name: "y0", line: 2, scope: !4, file: !5, type: !10)
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!15 = !DILocalVariable(name: "y1", line: 2, scope: !4, file: !5, type: !10)
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!16 = !DILocalVariable(name: "i", line: 3, scope: !17, file: !5, type: !8)
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!17 = distinct !DILexicalBlock(line: 3, column: 0, file: !1, scope: !4)
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!18 = !{i32 2, !"Dwarf Version", i32 2}
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!19 = !DILocation(line: 1, scope: !4)
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!20 = !{double 0.000000e+00}
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!21 = !DILocation(line: 2, scope: !4)
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!22 = !{double 1.000000e+00}
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!23 = !DILocation(line: 3, scope: !17)
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!24 = !DILocation(line: 4, scope: !25)
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!25 = distinct !DILexicalBlock(line: 3, column: 0, file: !1, scope: !17)
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!29 = !DILocation(line: 5, scope: !25)
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!30 = !DILocation(line: 7, scope: !4)
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!31 = !DILocation(line: 8, scope: !4)
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!32 = !{i32 1, !"Debug Info Version", i32 3}
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