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
115 lines
6.2 KiB
LLVM
115 lines
6.2 KiB
LLVM
; RUN: opt -instcombine %s -o - -S | FileCheck %s
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; typedef struct v *v_t;
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; struct v {
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; unsigned long long p;
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; };
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;
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; void f(v_t object, unsigned long long *start) {
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; unsigned head_size;
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; unsigned long long orig_start;
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; unsigned long long offset;
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; orig_start = *start;
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; for (offset = orig_start - (unsigned long long)(1 << 12); head_size;
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; offset -= (unsigned long long)(1 << 12), head_size -= (1 << 12))
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; use(offset, (object));
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; }
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source_filename = "test.i"
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target datalayout = "e-m:o-p:32:32-f64:32:64-v64:32:64-v128:32:128-a:0:32-n32-S32"
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target triple = "thumbv7s-apple-ios5.0.0"
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%struct.vm_object = type { i64 }
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; Function Attrs: nounwind ssp
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define void @f(%struct.vm_object* %object, i64* nocapture readonly %start) local_unnamed_addr #0 !dbg !11 {
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entry:
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tail call void @llvm.dbg.value(metadata %struct.vm_object* %object, metadata !21, metadata !DIExpression()), !dbg !27
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tail call void @llvm.dbg.value(metadata i64* %start, metadata !22, metadata !DIExpression()), !dbg !28
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%0 = load i64, i64* %start, align 4, !dbg !29
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tail call void @llvm.dbg.value(metadata i64 %0, metadata !25, metadata !DIExpression()), !dbg !30
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%offset.08 = add i64 %0, -4096
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tail call void @llvm.dbg.value(metadata i64 %offset.08, metadata !26, metadata !DIExpression()), !dbg !31
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tail call void @llvm.dbg.value(metadata i32 undef, metadata !23, metadata !DIExpression()), !dbg !32
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br i1 undef, label %for.end, label %for.body.lr.ph, !dbg !32
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for.body.lr.ph: ; preds = %entry
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; The 'load' and the 'add' are sunken to this basic block. So let's verify that the related dbg.values are sunken as well.
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; The add is later eliminated, so we verify that the dbg.value is salvaged by using DW_OP_minus.
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; CHECK-LABEL: for.body.lr.ph:
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; CHECK-NEXT: %0 = load
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i64 %0, metadata !25, metadata !DIExpression()), !dbg !
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; CHECK-NEXT: call void @llvm.dbg.value(metadata i64 %0, metadata !26, metadata !DIExpression(DW_OP_constu, 4096, DW_OP_minus, DW_OP_stack_value)), !dbg !
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br label %for.body, !dbg !32
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for.body: ; preds = %for.body.lr.ph, %for.body
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; CHECK-LABEL: for.body:
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%offset.010 = phi i64 [ %offset.08, %for.body.lr.ph ], [ %offset.0, %for.body ]
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%head_size.09 = phi i32 [ undef, %for.body.lr.ph ], [ %sub2, %for.body ]
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tail call void @llvm.dbg.value(metadata i32 %head_size.09, metadata !23, metadata !DIExpression()), !dbg !31
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%call = tail call i32 bitcast (i32 (...)* @use to i32 (i64, %struct.vm_object*)*)(i64 %offset.010, %struct.vm_object* %object) #3, !dbg !34
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%sub2 = add i32 %head_size.09, -4096, !dbg !37
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%offset.0 = add i64 %offset.010, -4096
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tail call void @llvm.dbg.value(metadata i64 %offset.0, metadata !26, metadata !DIExpression()), !dbg !30
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; CHECK: call void @llvm.dbg.value(metadata i64 %offset.010, metadata !26, metadata !DIExpression(DW_OP_constu, 4096, DW_OP_minus, DW_OP_stack_value)), !dbg !
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tail call void @llvm.dbg.value(metadata i32 %sub2, metadata !23, metadata !DIExpression()), !dbg !31
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%tobool = icmp eq i32 %sub2, 0, !dbg !32
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br i1 %tobool, label %for.end, label %for.body, !dbg !32, !llvm.loop !38
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for.end: ; preds = %for.body, %entry
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ret void, !dbg !40
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}
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declare i32 @use(...) local_unnamed_addr
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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 = { nounwind ssp }
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attributes #2 = { nounwind readnone speculatable }
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attributes #3 = { nobuiltin }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!5, !6, !7, !8, !9}
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!llvm.ident = !{!10}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 317434) (llvm/trunk 317437)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
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!1 = !DIFile(filename: "test.i", directory: "/Data/radar/31209283")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!5 = !{i32 2, !"Dwarf Version", i32 2}
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!6 = !{i32 2, !"Debug Info Version", i32 3}
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!7 = !{i32 1, !"wchar_size", i32 4}
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!8 = !{i32 1, !"min_enum_size", i32 4}
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!9 = !{i32 7, !"PIC Level", i32 2}
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!10 = !{!"clang version 6.0.0 (trunk 317434) (llvm/trunk 317437)"}
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!11 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 6, type: !12, isLocal: false, isDefinition: true, scopeLine: 6, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !20)
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!12 = !DISubroutineType(types: !13)
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!13 = !{null, !14, !19}
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!14 = !DIDerivedType(tag: DW_TAG_typedef, name: "v_t", file: !1, line: 1, baseType: !15)
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!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 32)
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!16 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "v", file: !1, line: 2, size: 64, elements: !17)
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!17 = !{!18}
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!18 = !DIDerivedType(tag: DW_TAG_member, name: "p", scope: !16, file: !1, line: 3, baseType: !4, size: 64)
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!19 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !4, size: 32)
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!20 = !{!21, !22, !23, !25, !26}
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!21 = !DILocalVariable(name: "object", arg: 1, scope: !11, file: !1, line: 6, type: !14)
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!22 = !DILocalVariable(name: "start", arg: 2, scope: !11, file: !1, line: 6, type: !19)
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!23 = !DILocalVariable(name: "head_size", scope: !11, file: !1, line: 7, type: !24)
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!24 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!25 = !DILocalVariable(name: "orig_start", scope: !11, file: !1, line: 8, type: !4)
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!26 = !DILocalVariable(name: "offset", scope: !11, file: !1, line: 9, type: !4)
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!27 = !DILocation(line: 6, column: 20, scope: !11)
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!28 = !DILocation(line: 6, column: 48, scope: !11)
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!29 = !DILocation(line: 8, column: 22, scope: !11)
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!30 = !DILocation(line: 7, column: 12, scope: !11)
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!31 = !DILocation(line: 10, column: 16, scope: !11)
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!32 = !DILocation(line: 11, column: 5, scope: !33)
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!33 = distinct !DILexicalBlock(scope: !11, file: !1, line: 11, column: 5)
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!34 = !DILocation(line: 13, column: 7, scope: !35)
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!35 = distinct !DILexicalBlock(scope: !36, file: !1, line: 12, column: 75)
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!36 = distinct !DILexicalBlock(scope: !33, file: !1, line: 11, column: 5)
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!37 = !DILocation(line: 12, column: 61, scope: !36)
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!38 = distinct !{!38, !32, !39}
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!39 = !DILocation(line: 14, column: 3, scope: !33)
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!40 = !DILocation(line: 15, column: 1, scope: !11)
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