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https://github.com/RPCS3/llvm-mirror.git
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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
119 lines
5.5 KiB
LLVM
119 lines
5.5 KiB
LLVM
; RUN: opt -codegenprepare -S %s -o - | FileCheck %s
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; typedef struct info {
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; unsigned long long size;
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; } info_t;
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; extern unsigned p;
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; extern unsigned n;
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; void f() {
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; unsigned int i;
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; if (p) {
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; info_t *info = (info_t *)p;
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; for (i = 0; i < n; i++)
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; use(info[i].size);
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; }
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; }
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source_filename = "debug.i"
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target datalayout = "e-m:o-p:32:32-i64:64-a:0:32-n32-S128"
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target triple = "thumbv7k-apple-ios10.0.0"
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%struct.info = type { i64 }
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@p = external local_unnamed_addr global i32, align 4
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@n = external local_unnamed_addr global i32, align 4
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; Function Attrs: nounwind ssp uwtable
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define void @f() local_unnamed_addr #0 !dbg !16 {
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entry:
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%0 = load i32, i32* @p, align 4, !dbg !25
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%tobool = icmp eq i32 %0, 0, !dbg !25
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br i1 %tobool, label %if.end, label %if.then, !dbg !26
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if.then: ; preds = %entry
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%1 = inttoptr i32 %0 to %struct.info*, !dbg !27
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tail call void @llvm.dbg.value(metadata %struct.info* %1, metadata !22, metadata !DIExpression()), !dbg !28
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; CHECK: call void @llvm.dbg.value(metadata i32 %0, metadata !22, metadata !DIExpression())
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tail call void @llvm.dbg.value(metadata i32 0, metadata !20, metadata !DIExpression()), !dbg !29
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%2 = load i32, i32* @n, align 4, !dbg !30
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%cmp5 = icmp eq i32 %2, 0, !dbg !33
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br i1 %cmp5, label %if.end, label %for.body.preheader, !dbg !34
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for.body.preheader: ; preds = %if.then
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; CHECK: for.body.preheader:
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; CHECK: %2 = inttoptr i32 %0 to %struct.info*
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br label %for.body, !dbg !35
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for.body: ; preds = %for.body.preheader, %for.body
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%lsr.iv = phi %struct.info* [ %1, %for.body.preheader ], [ %scevgep, %for.body ]
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%i.06 = phi i32 [ %inc, %for.body ], [ 0, %for.body.preheader ]
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%lsr.iv7 = bitcast %struct.info* %lsr.iv to i64*
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tail call void @llvm.dbg.value(metadata i32 %i.06, metadata !20, metadata !DIExpression()), !dbg !29
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%3 = load i64, i64* %lsr.iv7, align 8, !dbg !35
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%call = tail call i32 bitcast (i32 (...)* @use to i32 (i64)*)(i64 %3) #3, !dbg !36
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%inc = add nuw i32 %i.06, 1, !dbg !37
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tail call void @llvm.dbg.value(metadata i32 %inc, metadata !20, metadata !DIExpression()), !dbg !29
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%4 = load i32, i32* @n, align 4, !dbg !30
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%scevgep = getelementptr %struct.info, %struct.info* %lsr.iv, i32 1, !dbg !33
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%cmp = icmp ult i32 %inc, %4, !dbg !33
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br i1 %cmp, label %for.body, label %if.end.loopexit, !dbg !34, !llvm.loop !38
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if.end.loopexit: ; preds = %for.body
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br label %if.end, !dbg !40
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if.end: ; preds = %if.end.loopexit, %if.then, %entry
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ret void, !dbg !40
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}
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declare i32 @use(...) 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 = { nounwind ssp uwtable }
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attributes #2 = { nounwind readnone speculatable }
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attributes #3 = { nobuiltin nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!10, !11, !12, !13, !14}
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!llvm.ident = !{!15}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 317231) (llvm/trunk 317262)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
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!1 = !DIFile(filename: "debug.i", directory: "/Data/radar/35321562")
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!2 = !{}
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!3 = !{!4}
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!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 32)
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!5 = !DIDerivedType(tag: DW_TAG_typedef, name: "info_t", file: !1, line: 3, baseType: !6)
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!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "info", file: !1, line: 1, size: 64, elements: !7)
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!7 = !{!8}
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!8 = !DIDerivedType(tag: DW_TAG_member, name: "size", scope: !6, file: !1, line: 2, baseType: !9, size: 64)
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!9 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!10 = !{i32 2, !"Dwarf Version", i32 4}
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!11 = !{i32 2, !"Debug Info Version", i32 3}
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!12 = !{i32 1, !"wchar_size", i32 4}
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!13 = !{i32 1, !"min_enum_size", i32 4}
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!14 = !{i32 7, !"PIC Level", i32 2}
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!15 = !{!"clang version 6.0.0 (trunk 317231) (llvm/trunk 317262)"}
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!16 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 6, type: !17, isLocal: false, isDefinition: true, scopeLine: 6, isOptimized: true, unit: !0, retainedNodes: !19)
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!17 = !DISubroutineType(types: !18)
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!18 = !{null}
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!19 = !{!20, !22}
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!20 = !DILocalVariable(name: "i", scope: !16, file: !1, line: 7, type: !21)
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!21 = !DIBasicType(name: "unsigned int", size: 32, encoding: DW_ATE_unsigned)
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!22 = !DILocalVariable(name: "info", scope: !23, file: !1, line: 9, type: !4)
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!23 = distinct !DILexicalBlock(scope: !24, file: !1, line: 8, column: 10)
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!24 = distinct !DILexicalBlock(scope: !16, file: !1, line: 8, column: 7)
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!25 = !DILocation(line: 8, column: 7, scope: !24)
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!26 = !DILocation(line: 8, column: 7, scope: !16)
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!27 = !DILocation(line: 9, column: 20, scope: !23)
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!28 = !DILocation(line: 9, column: 13, scope: !23)
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!29 = !DILocation(line: 7, column: 16, scope: !16)
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!30 = !DILocation(line: 10, column: 21, scope: !31)
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!31 = distinct !DILexicalBlock(scope: !32, file: !1, line: 10, column: 5)
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!32 = distinct !DILexicalBlock(scope: !23, file: !1, line: 10, column: 5)
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!33 = !DILocation(line: 10, column: 19, scope: !31)
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!34 = !DILocation(line: 10, column: 5, scope: !32)
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!35 = !DILocation(line: 11, column: 19, scope: !31)
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!36 = !DILocation(line: 11, column: 7, scope: !31)
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!37 = !DILocation(line: 10, column: 25, scope: !31)
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!38 = distinct !{!38, !34, !39}
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!39 = !DILocation(line: 11, column: 23, scope: !32)
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!40 = !DILocation(line: 13, column: 1, scope: !16)
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