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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
111 lines
5.3 KiB
LLVM
111 lines
5.3 KiB
LLVM
; RUN: llc -mtriple=x86_64-unknown-unknown -stop-before livedebugvalues %s -o - \
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; RUN: | FileCheck %s
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;
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; Generated at -O1 from:
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; typedef struct {
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; unsigned long long c;
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; } S1;
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; struct S3 {
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; unsigned long long packed;
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; };
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; struct S6 {
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; struct S0 *b;
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; };
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; void f(struct S3 *a3)
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; {
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; struct S4 *s4 = (struct S4 *)(a3->packed + 0x1000UL);
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; struct S6 *myVar = (struct S6 *)s4;
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; struct S0 *b = myVar->b;
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; use(b);
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; }
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;
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; The debug info is attached to the ADD 4096 operation, which doesn't survive
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; instruction selection as it is folded into the load.
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;
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; CHECK: ![[S4:.*]] = !DILocalVariable(name: "s4",
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; CHECK: ![[MYVAR:.*]] = !DILocalVariable(name: "myVar",
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; CHECK: DBG_VALUE debug-use $rax, debug-use $noreg, ![[MYVAR]],
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; CHECK-SAME: !DIExpression(DW_OP_plus_uconst, 4096, DW_OP_stack_value)
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; CHECK-NEXT: DBG_VALUE debug-use $rax, debug-use $noreg, ![[S4]],
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; CHECK-SAME: !DIExpression(DW_OP_plus_uconst, 4096, DW_OP_stack_value)
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; CHECK-NEXT: $rdi = MOV64rm killed renamable $rax, 1, $noreg, 4096, $noreg,
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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-macosx10.13.0"
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%struct.S3 = type { i64 }
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%struct.S4 = type opaque
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%struct.S0 = type opaque
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; Function Attrs: noinline nounwind ssp uwtable
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define void @f(%struct.S3* nocapture readonly %a3) local_unnamed_addr #0 !dbg !6 {
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entry:
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tail call void @llvm.dbg.value(metadata %struct.S3* %a3, metadata !15, metadata !DIExpression()), !dbg !30
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%packed = getelementptr inbounds %struct.S3, %struct.S3* %a3, i64 0, i32 0, !dbg !31
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%0 = load i64, i64* %packed, align 8, !dbg !31
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%add = add i64 %0, 4096, !dbg !37
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%1 = inttoptr i64 %add to %struct.S4*, !dbg !38
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tail call void @llvm.dbg.value(metadata %struct.S4* %1, metadata !16, metadata !DIExpression()), !dbg !39
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tail call void @llvm.dbg.value(metadata %struct.S4* %1, metadata !17, metadata !DIExpression()), !dbg !40
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%b1 = bitcast %struct.S4* %1 to %struct.S0**, !dbg !41
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%2 = load %struct.S0*, %struct.S0** %b1, align 8, !dbg !41
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tail call void @llvm.dbg.value(metadata %struct.S0* %2, metadata !24, metadata !DIExpression()), !dbg !45
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%call = tail call i32 (%struct.S0*, ...) bitcast (i32 (...)* @use to i32 (%struct.S0*, ...)*)(%struct.S0* %2) #3, !dbg !46
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ret void, !dbg !47
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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 = { noinline nounwind ssp uwtable }
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attributes #2 = { nounwind readnone speculatable }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!25, !26, !27, !28}
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!llvm.ident = !{!29}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 (trunk 316467) (llvm/trunk 316466)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, retainedTypes: !3)
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!1 = !DIFile(filename: "test.c", directory: "/")
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!2 = !{}
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!3 = !{!4, !18}
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!4 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !5, size: 64)
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!5 = !DICompositeType(tag: DW_TAG_structure_type, name: "S4", scope: !6, file: !1, line: 20, flags: DIFlagFwdDecl)
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!6 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 18, type: !7, isLocal: false, isDefinition: true, scopeLine: 19, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !14)
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!7 = !DISubroutineType(types: !8)
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!8 = !{null, !9}
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!9 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !10, size: 64)
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!10 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S3", file: !1, line: 5, size: 64, elements: !11)
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!11 = !{!12}
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!12 = !DIDerivedType(tag: DW_TAG_member, name: "packed", scope: !10, file: !1, line: 6, baseType: !13, size: 64)
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!13 = !DIBasicType(name: "long long unsigned int", size: 64, encoding: DW_ATE_unsigned)
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!14 = !{!15, !16, !17, !24}
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!15 = !DILocalVariable(name: "a3", arg: 1, scope: !6, file: !1, line: 18, type: !9)
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!16 = !DILocalVariable(name: "s4", scope: !6, file: !1, line: 20, type: !4)
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!17 = !DILocalVariable(name: "myVar", scope: !6, file: !1, line: 21, type: !18)
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!18 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !19, size: 64)
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!19 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "S6", file: !1, line: 8, size: 64, elements: !20)
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!20 = !{!21}
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!21 = !DIDerivedType(tag: DW_TAG_member, name: "b", scope: !19, file: !1, line: 9, baseType: !22, size: 64)
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!22 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !23, size: 64)
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!23 = !DICompositeType(tag: DW_TAG_structure_type, name: "S0", file: !1, line: 4, flags: DIFlagFwdDecl)
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!24 = !DILocalVariable(name: "b", scope: !6, file: !1, line: 22, type: !22)
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!25 = !{i32 2, !"Dwarf Version", i32 4}
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!26 = !{i32 2, !"Debug Info Version", i32 3}
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!27 = !{i32 1, !"wchar_size", i32 4}
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!28 = !{i32 7, !"PIC Level", i32 2}
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!29 = !{!"clang version 6.0.0 (trunk 316467) (llvm/trunk 316466)"}
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!30 = !DILocation(line: 18, column: 14, scope: !6)
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!31 = !DILocation(line: 20, column: 37, scope: !6)
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!37 = !DILocation(line: 20, column: 44, scope: !6)
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!38 = !DILocation(line: 20, column: 19, scope: !6)
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!39 = !DILocation(line: 20, column: 14, scope: !6)
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!40 = !DILocation(line: 21, column: 14, scope: !6)
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!41 = !DILocation(line: 22, column: 25, scope: !6)
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!45 = !DILocation(line: 22, column: 14, scope: !6)
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!46 = !DILocation(line: 23, column: 3, scope: !6)
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!47 = !DILocation(line: 24, column: 1, scope: !6)
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