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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
84 lines
3.2 KiB
LLVM
84 lines
3.2 KiB
LLVM
; RUN: %llc_dwarf -filetype=obj < %s | llvm-dwarfdump -v - | FileCheck %s
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; Generated at -O2 from:
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; bool c();
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; void f();
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; bool start() {
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; bool result = c();
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; if (!c()) {
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; result = false;
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; goto exit;
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; }
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; f();
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; result = true;
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; exit:
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; return result;
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; }
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;
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; The constant should NOT be available for the entire function.
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; CHECK-NOT: DW_AT_const_value
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; CHECK: .debug_loc contents:
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; CHECK-NEXT: 0x00000000:
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; CHECK-NEXT: {{.*}}: DW_OP_constu 0x1, DW_OP_stack_value
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source_filename = "test.ii"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.12.0"
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; Function Attrs: noimplicitfloat noredzone nounwind optsize
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define zeroext i1 @_Z5startv() local_unnamed_addr #0 !dbg !7 {
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entry:
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%call = tail call zeroext i1 @_Z1cv() #3, !dbg !13
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%call1 = tail call zeroext i1 @_Z1cv() #3, !dbg !14
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br i1 %call1, label %if.end, label %exit, !dbg !16
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if.end: ; preds = %entry
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tail call void @_Z1fv() #3, !dbg !17
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tail call void @llvm.dbg.value(metadata i8 1, metadata !12, metadata !18), !dbg !19
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br label %exit, !dbg !20
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exit: ; preds = %entry, %if.end
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%result.0 = phi i1 [ true, %if.end ], [ false, %entry ]
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ret i1 %result.0, !dbg !21
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}
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; Function Attrs: noimplicitfloat noredzone optsize
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declare zeroext i1 @_Z1cv() local_unnamed_addr #1
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; Function Attrs: noimplicitfloat noredzone optsize
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declare void @_Z1fv() local_unnamed_addr #1
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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 = { noimplicitfloat noredzone nounwind optsize }
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attributes #1 = { noimplicitfloat noredzone optsize }
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attributes #2 = { nounwind readnone speculatable }
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attributes #3 = { nobuiltin noimplicitfloat noredzone nounwind optsize }
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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_C_plus_plus, file: !1, producer: "clang version 5.0.0 (trunk 303873) (llvm/trunk 303897)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "test.ii", 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, !"wchar_size", i32 4}
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!6 = !{!"clang version 5.0.0 (trunk 303873) (llvm/trunk 303897)"}
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!7 = distinct !DISubprogram(name: "start", linkageName: "_Z5startv", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !11)
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!8 = !DISubroutineType(types: !9)
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!9 = !{!10}
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!10 = !DIBasicType(name: "bool", size: 8, encoding: DW_ATE_boolean)
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!11 = !{!12}
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!12 = !DILocalVariable(name: "result", scope: !7, file: !1, line: 4, type: !10)
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!13 = !DILocation(line: 4, column: 17, scope: !7)
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!14 = !DILocation(line: 5, column: 8, scope: !15)
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!15 = distinct !DILexicalBlock(scope: !7, file: !1, line: 5, column: 7)
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!16 = !DILocation(line: 5, column: 7, scope: !7)
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!17 = !DILocation(line: 9, column: 3, scope: !7)
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!18 = !DIExpression()
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!19 = !DILocation(line: 4, column: 8, scope: !7)
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!20 = !DILocation(line: 10, column: 3, scope: !7)
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!21 = !DILocation(line: 12, column: 3, scope: !7)
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