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
84 lines
3.8 KiB
LLVM
84 lines
3.8 KiB
LLVM
; RUN: opt < %s -add-discriminators -S | FileCheck %s
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;
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; Generated at -O3 from:
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; g();f(){for(;;){g();}}g(){__builtin___memset_chk(0,0,0,__builtin_object_size(1,0));}
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; The fact that everything is on one line is significant!
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;
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; This test ensures that inline info isn't dropped even if the call site and the
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; inlined function are defined on the same line.
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source_filename = "t.c"
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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target triple = "arm64-apple-ios"
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; Function Attrs: noreturn nounwind ssp
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define i32 @f() local_unnamed_addr #0 !dbg !7 {
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entry:
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%0 = tail call i64 @llvm.objectsize.i64.p0i8(i8* inttoptr (i64 1 to i8*), i1 false) #2, !dbg !11
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br label %for.cond, !dbg !18
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for.cond: ; preds = %for.cond, %entry
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; CHECK: %call.i
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%call.i = tail call i8* @__memset_chk(i8* null, i32 0, i64 0, i64 %0) #2, !dbg !19
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; CHECK: br label %for.cond, !dbg ![[BR:[0-9]+]]
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br label %for.cond, !dbg !20, !llvm.loop !21
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}
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; Function Attrs: nounwind ssp
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define i32 @g() local_unnamed_addr #1 !dbg !12 {
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entry:
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%0 = tail call i64 @llvm.objectsize.i64.p0i8(i8* inttoptr (i64 1 to i8*), i1 false), !dbg !22
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%call = tail call i8* @__memset_chk(i8* null, i32 0, i64 0, i64 %0) #2, !dbg !23
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ret i32 undef, !dbg !24
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}
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; Function Attrs: nounwind
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declare i8* @__memset_chk(i8*, i32, i64, i64) local_unnamed_addr #2
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; Function Attrs: nounwind readnone
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declare i64 @llvm.objectsize.i64.p0i8(i8*, i1) #3
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attributes #0 = { noreturn nounwind ssp }
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attributes #1 = { nounwind ssp }
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attributes #2 = { nounwind }
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attributes #3 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "LLVM version 4.0.0", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "t.c", directory: "/")
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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, !"PIC Level", i32 2}
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!6 = !{!"LLVM version 4.0.0"}
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; CHECK: ![[F:.*]] = distinct !DISubprogram(name: "f",
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!7 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!11 = !DILocation(line: 1, column: 56, scope: !12, inlinedAt: !13)
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!12 = distinct !DISubprogram(name: "g", scope: !1, file: !1, line: 1, type: !8, isLocal: false, isDefinition: true, scopeLine: 1, isOptimized: true, unit: !0, retainedNodes: !2)
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!13 = distinct !DILocation(line: 1, column: 17, scope: !14)
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; CHECK: ![[BF:.*]] = !DILexicalBlockFile(scope: ![[LB1:[0-9]+]],
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; CHECK-SAME: discriminator: 2)
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!14 = !DILexicalBlockFile(scope: !15, file: !1, discriminator: 2)
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; CHECK: ![[LB1]] = distinct !DILexicalBlock(scope: ![[LB2:[0-9]+]],
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; CHECK-SAME: line: 1, column: 16)
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!15 = distinct !DILexicalBlock(scope: !16, file: !1, line: 1, column: 16)
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; CHECK: ![[LB2]] = distinct !DILexicalBlock(scope: ![[LB3:[0-9]+]],
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; CHECK-SAME: line: 1, column: 9)
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!16 = distinct !DILexicalBlock(scope: !17, file: !1, line: 1, column: 9)
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; CHECK: ![[LB3]] = distinct !DILexicalBlock(scope: ![[F]],
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; CHECK-SAME: line: 1, column: 9)
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!17 = distinct !DILexicalBlock(scope: !7, file: !1, line: 1, column: 9)
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!18 = !DILocation(line: 1, column: 9, scope: !7)
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!19 = !DILocation(line: 1, column: 27, scope: !12, inlinedAt: !13)
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; CHECK: ![[BR]] = !DILocation(line: 1, column: 9, scope: !14)
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!20 = !DILocation(line: 1, column: 9, scope: !14)
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!21 = distinct !{!21, !18}
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!22 = !DILocation(line: 1, column: 56, scope: !12)
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!23 = !DILocation(line: 1, column: 27, scope: !12)
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!24 = !DILocation(line: 1, column: 84, scope: !12)
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