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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
87 lines
5.0 KiB
LLVM
87 lines
5.0 KiB
LLVM
; RUN: opt -S -asan %s | FileCheck %s
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; The IR of this testcase is generated from the following C code:
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; void bar (int);
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;
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; void foo() {
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; __block int x;
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; bar(x);
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; }
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; by compiling it with 'clang -emit-llvm -g -S' and then by manually
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; adding the sanitize_address attribute to the @foo() function (so
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; that ASAN accepts to instrument the function in the above opt run).
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; Check that the location of the ASAN instrumented __block variable is
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; correct.
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; CHECK: !DIExpression(DW_OP_deref, DW_OP_plus_uconst, 32, DW_OP_plus_uconst, 8, DW_OP_deref, DW_OP_plus_uconst, 24)
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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%struct.__block_byref_x = type { i8*, %struct.__block_byref_x*, i32, i32, i32 }
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; Function Attrs: nounwind ssp uwtable
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define void @foo() #0 !dbg !4 {
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entry:
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%x = alloca %struct.__block_byref_x, align 8
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call void @llvm.dbg.declare(metadata %struct.__block_byref_x* %x, metadata !12, metadata !22), !dbg !23
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%byref.isa = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %x, i32 0, i32 0, !dbg !24
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store i8* null, i8** %byref.isa, !dbg !24
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%byref.forwarding = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %x, i32 0, i32 1, !dbg !24
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store %struct.__block_byref_x* %x, %struct.__block_byref_x** %byref.forwarding, !dbg !24
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%byref.flags = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %x, i32 0, i32 2, !dbg !24
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store i32 0, i32* %byref.flags, !dbg !24
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%byref.size = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %x, i32 0, i32 3, !dbg !24
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store i32 32, i32* %byref.size, !dbg !24
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%forwarding = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %x, i32 0, i32 1, !dbg !25
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%0 = load %struct.__block_byref_x*, %struct.__block_byref_x** %forwarding, !dbg !25
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%x1 = getelementptr inbounds %struct.__block_byref_x, %struct.__block_byref_x* %0, i32 0, i32 4, !dbg !25
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%1 = load i32, i32* %x1, align 4, !dbg !25
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call void @bar(i32 %1), !dbg !25
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%2 = bitcast %struct.__block_byref_x* %x to i8*, !dbg !26
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call void @_Block_object_dispose(i8* %2, i32 8) #3, !dbg !26
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ret void, !dbg !26
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}
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.declare(metadata, metadata, metadata) #1
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declare void @bar(i32) #2
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declare void @_Block_object_dispose(i8*, i32)
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attributes #0 = { nounwind ssp uwtable sanitize_address "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #1 = { nounwind readnone }
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attributes #2 = { "less-precise-fpmad"="false" "no-frame-pointer-elim"="true" "no-frame-pointer-elim-non-leaf" "no-infs-fp-math"="false" "no-nans-fp-math"="false" "stack-protector-buffer-size"="8" "unsafe-fp-math"="false" "use-soft-float"="false" }
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attributes #3 = { nounwind }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!8, !9, !10}
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!llvm.ident = !{!11}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.6.0 (trunk 223120) (llvm/trunk 223119)", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "block.c", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "foo", line: 3, isLocal: false, isDefinition: true, isOptimized: false, unit: !0, scopeLine: 3, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DIFile(filename: "block.c", directory: "/tmp")
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!6 = !DISubroutineType(types: !7)
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!7 = !{null}
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!8 = !{i32 2, !"Dwarf Version", i32 2}
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!9 = !{i32 2, !"Debug Info Version", i32 3}
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!10 = !{i32 1, !"PIC Level", i32 2}
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!11 = !{!"clang version 3.6.0 (trunk 223120) (llvm/trunk 223119)"}
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!12 = !DILocalVariable(name: "x", line: 4, scope: !4, file: !5, type: !13)
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!13 = !DICompositeType(tag: DW_TAG_structure_type, size: 224, flags: DIFlagBlockByrefStruct, file: !1, scope: !5, elements: !14)
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!14 = !{!15, !17, !18, !20, !21}
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!15 = !DIDerivedType(tag: DW_TAG_member, name: "__isa", size: 64, align: 64, file: !1, scope: !5, baseType: !16)
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!16 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: null)
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!17 = !DIDerivedType(tag: DW_TAG_member, name: "__forwarding", size: 64, align: 64, offset: 64, file: !1, scope: !5, baseType: !16)
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!18 = !DIDerivedType(tag: DW_TAG_member, name: "__flags", size: 32, align: 32, offset: 128, file: !1, scope: !5, baseType: !19)
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!19 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!20 = !DIDerivedType(tag: DW_TAG_member, name: "__size", size: 32, align: 32, offset: 160, file: !1, scope: !5, baseType: !19)
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!21 = !DIDerivedType(tag: DW_TAG_member, name: "x", size: 32, align: 32, offset: 192, file: !1, scope: !5, baseType: !19)
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!22 = !DIExpression(DW_OP_plus_uconst, 8, DW_OP_deref, DW_OP_plus_uconst, 24)
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!23 = !DILocation(line: 4, column: 15, scope: !4)
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!24 = !DILocation(line: 4, column: 3, scope: !4)
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!25 = !DILocation(line: 5, column: 3, scope: !4)
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!26 = !DILocation(line: 6, column: 1, scope: !4)
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