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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
131 lines
6.0 KiB
LLVM
131 lines
6.0 KiB
LLVM
; RUN: opt -S -globalopt < %s | FileCheck %s
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source_filename = "test.c"
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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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%struct.mystruct = type { i32, i64 }
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; Generated at -Os from:
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;
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; static struct mystruct {
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; int a;
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; long long int b;
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; } static_struct;
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; void __attribute__((nodebug)) foo(int in) { static_struct.a = in; }
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; void __attribute__((nodebug)) bar(int in) { static_struct.b = in; }
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; int main(int argc, char **argv)
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; {
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; foo(argv[0][1]);
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; bar(argv[0][1]);
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; return static_struct.a + static_struct.b;
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; }
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; CHECK: @static_struct.0 = internal unnamed_addr global i32 0, align 8, !dbg ![[EL0:.*]]
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; CHECK: @static_struct.1 = internal unnamed_addr global i64 0, align 8, !dbg ![[EL1:.*]]
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; CHECK: ![[EL0]] = !DIGlobalVariableExpression(var: ![[VAR:.*]], expr: !DIExpression(DW_OP_LLVM_fragment, 0, 32))
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; CHECK: ![[VAR]] = distinct !DIGlobalVariable(name: "static_struct"
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; CHECK: ![[EL1]] = !DIGlobalVariableExpression(var: ![[VAR]], expr: !DIExpression(DW_OP_LLVM_fragment, 64, 64))
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@static_struct = internal global %struct.mystruct zeroinitializer, align 8, !dbg !0
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; Function Attrs: nounwind optsize ssp uwtable
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define void @foo(i32 %in) #0 {
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entry:
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store i32 %in, i32* getelementptr inbounds (%struct.mystruct, %struct.mystruct* @static_struct, i32 0, i32 0), align 8, !tbaa !17
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ret void
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}
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; Function Attrs: nounwind optsize ssp uwtable
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define void @bar(i32 %in) #0 {
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entry:
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%conv = sext i32 %in to i64
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store i64 %conv, i64* getelementptr inbounds (%struct.mystruct, %struct.mystruct* @static_struct, i32 0, i32 1), align 8, !tbaa !23
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ret void
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}
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; Function Attrs: nounwind optsize ssp uwtable
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define i32 @main(i32 %argc, i8** %argv) #0 !dbg !24 {
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entry:
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call void @llvm.dbg.value(metadata i32 %argc, metadata !31, metadata !33), !dbg !34
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call void @llvm.dbg.value(metadata i8** %argv, metadata !32, metadata !33), !dbg !35
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%0 = load i8*, i8** %argv, align 8, !dbg !36, !tbaa !37
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%arrayidx1 = getelementptr inbounds i8, i8* %0, i64 1, !dbg !36
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%1 = load i8, i8* %arrayidx1, align 1, !dbg !36, !tbaa !39
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%conv = sext i8 %1 to i32, !dbg !36
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call void @foo(i32 %conv) #2, !dbg !40
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%2 = load i8*, i8** %argv, align 8, !dbg !41, !tbaa !37
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%arrayidx3 = getelementptr inbounds i8, i8* %2, i64 1, !dbg !41
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%3 = load i8, i8* %arrayidx3, align 1, !dbg !41, !tbaa !39
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%conv4 = sext i8 %3 to i32, !dbg !41
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call void @bar(i32 %conv4) #2, !dbg !42
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%4 = load i32, i32* getelementptr inbounds (%struct.mystruct, %struct.mystruct* @static_struct, i32 0, i32 0), align 8, !dbg !43, !tbaa !17
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%conv5 = sext i32 %4 to i64, !dbg !44
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%5 = load i64, i64* getelementptr inbounds (%struct.mystruct, %struct.mystruct* @static_struct, i32 0, i32 1), align 8, !dbg !45, !tbaa !23
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%add = add nsw i64 %conv5, %5, !dbg !46
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%conv6 = trunc i64 %add to i32, !dbg !44
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ret i32 %conv6, !dbg !47
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind optsize ssp uwtable }
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attributes #1 = { nounwind readnone speculatable }
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attributes #2 = { optsize }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!12, !13, !14, !15}
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!llvm.ident = !{!16}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = distinct !DIGlobalVariable(name: "static_struct", scope: !2, file: !3, line: 4, type: !6, isLocal: true, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 6.0.0 (trunk 309852) (llvm/trunk 309850)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "test.c", directory: "/")
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!4 = !{}
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!5 = !{!0}
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!6 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "mystruct", file: !3, line: 1, size: 128, elements: !7)
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!7 = !{!8, !10}
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!8 = !DIDerivedType(tag: DW_TAG_member, name: "a", scope: !6, file: !3, line: 2, baseType: !9, size: 32)
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!9 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!10 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !6, file: !3, line: 3, baseType: !11, size: 64, offset: 64)
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!11 = !DIBasicType(name: "long long int", size: 64, encoding: DW_ATE_signed)
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!12 = !{i32 2, !"Dwarf Version", i32 4}
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!13 = !{i32 2, !"Debug Info Version", i32 3}
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!14 = !{i32 1, !"wchar_size", i32 4}
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!15 = !{i32 7, !"PIC Level", i32 2}
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!16 = !{!"clang version 6.0.0 (trunk 309852) (llvm/trunk 309850)"}
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!17 = !{!18, !19, i64 0}
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!18 = !{!"mystruct", !19, i64 0, !22, i64 8}
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!19 = !{!"int", !20, i64 0}
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!20 = !{!"omnipotent char", !21, i64 0}
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!21 = !{!"Simple C/C++ TBAA"}
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!22 = !{!"long long", !20, i64 0}
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!23 = !{!18, !22, i64 8}
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!24 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 7, type: !25, isLocal: false, isDefinition: true, scopeLine: 8, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !30)
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!25 = !DISubroutineType(types: !26)
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!26 = !{!9, !9, !27}
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!27 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !28, size: 64)
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!28 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !29, size: 64)
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!29 = !DIBasicType(name: "char", size: 8, encoding: DW_ATE_signed_char)
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!30 = !{!31, !32}
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!31 = !DILocalVariable(name: "argc", arg: 1, scope: !24, file: !3, line: 7, type: !9)
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!32 = !DILocalVariable(name: "argv", arg: 2, scope: !24, file: !3, line: 7, type: !27)
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!33 = !DIExpression()
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!34 = !DILocation(line: 7, column: 14, scope: !24)
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!35 = !DILocation(line: 7, column: 27, scope: !24)
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!36 = !DILocation(line: 9, column: 9, scope: !24)
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!37 = !{!38, !38, i64 0}
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!38 = !{!"any pointer", !20, i64 0}
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!39 = !{!20, !20, i64 0}
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!40 = !DILocation(line: 9, column: 5, scope: !24)
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!41 = !DILocation(line: 10, column: 9, scope: !24)
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!42 = !DILocation(line: 10, column: 5, scope: !24)
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!43 = !DILocation(line: 11, column: 26, scope: !24)
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!44 = !DILocation(line: 11, column: 12, scope: !24)
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!45 = !DILocation(line: 11, column: 44, scope: !24)
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!46 = !DILocation(line: 11, column: 28, scope: !24)
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!47 = !DILocation(line: 11, column: 5, scope: !24)
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