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
122 lines
5.3 KiB
LLVM
122 lines
5.3 KiB
LLVM
; REQUIRES: object-emission
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;
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; RUN: llc -mtriple=x86_64-unknown-linux-gnu -O0 -filetype=obj < %s > %t
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; RUN: llvm-dwarfdump -v -debug-info %t | FileCheck %s
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; Test case derived from compiling the following source with clang -g:
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;
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; namespace pr14763 {
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; struct foo {
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; foo(const foo&);
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; };
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;
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; foo func(foo f) {
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; return f; // reference 'f' for now because otherwise we hit another bug
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; }
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;
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; void sink(void*);
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;
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; void func2(bool b, foo g) {
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; if (b)
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; sink(&g); // reference 'f' for now because otherwise we hit another bug
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; }
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; }
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; CHECK: debug_info contents
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; The parameter is accessed indirectly (with a zero offset) from the second
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; register parameter. RDI is consumed by 'sret'.
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; CHECK: DW_TAG_subprogram
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; CHECK: DW_AT_name{{.*}} = "func"
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; CHECK: DW_TAG_formal_parameter
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; CHECK: DW_AT_location {{.*}} (DW_OP_breg4 RSI+0, DW_OP_deref)
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name{{.*}} = "f"
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; CHECK: DW_TAG_subprogram
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; CHECK: DW_AT_name{{.*}} = "func2"
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; CHECK: DW_TAG_formal_parameter
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; CHECK: DW_AT_location{{.*}}(DW_OP_fbreg +23)
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; CHECK: DW_TAG_formal_parameter
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; CHECK: DW_AT_location{{.*}}(
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; CHECK-NEXT: {{.*}}: DW_OP_breg4 RSI+0, DW_OP_deref
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; CHECK-NEXT: {{.*}}: DW_OP_breg7 RSP+8, DW_OP_deref, DW_OP_deref)
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; CHECK-NOT: DW_TAG
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; CHECK: DW_AT_name{{.*}} = "g"
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%"struct.pr14763::foo" = type { i8 }
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; Function Attrs: uwtable
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define void @_ZN7pr147634funcENS_3fooE(%"struct.pr14763::foo"* noalias sret %agg.result, %"struct.pr14763::foo"* %f) #0 !dbg !4 {
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entry:
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call void @llvm.dbg.declare(metadata %"struct.pr14763::foo"* %f, metadata !22, metadata !DIExpression(DW_OP_deref)), !dbg !24
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call void @_ZN7pr147633fooC1ERKS0_(%"struct.pr14763::foo"* %agg.result, %"struct.pr14763::foo"* %f), !dbg !25
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ret void, !dbg !25
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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 @_ZN7pr147633fooC1ERKS0_(%"struct.pr14763::foo"*, %"struct.pr14763::foo"*) #2
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; Function Attrs: uwtable
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define void @_ZN7pr147635func2EbNS_3fooE(i1 zeroext %b, %"struct.pr14763::foo"* %g) #0 !dbg !17 {
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entry:
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%b.addr = alloca i8, align 1
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%frombool = zext i1 %b to i8
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store i8 %frombool, i8* %b.addr, align 1
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call void @llvm.dbg.declare(metadata i8* %b.addr, metadata !26, metadata !DIExpression()), !dbg !27
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call void @llvm.dbg.declare(metadata %"struct.pr14763::foo"* %g, metadata !28, metadata !DIExpression(DW_OP_deref)), !dbg !27
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%0 = load i8, i8* %b.addr, align 1, !dbg !29
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%tobool = trunc i8 %0 to i1, !dbg !29
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br i1 %tobool, label %if.then, label %if.end, !dbg !29
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if.then: ; preds = %entry
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%1 = bitcast %"struct.pr14763::foo"* %g to i8*, !dbg !31
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call void @_ZN7pr147634sinkEPv(i8* %1), !dbg !31
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br label %if.end, !dbg !31
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if.end: ; preds = %if.then, %entry
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ret void, !dbg !32
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}
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declare void @_ZN7pr147634sinkEPv(i8*)
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attributes #0 = { uwtable }
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attributes #1 = { nounwind readnone }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!21, !33}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.4 ", isOptimized: false, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "pass.cpp", directory: "/tmp")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "func", linkageName: "_ZN7pr147634funcENS_3fooE", line: 6, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 6, file: !1, scope: !5, type: !6, retainedNodes: !2)
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!5 = !DINamespace(name: "pr14763", scope: null)
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!6 = !DISubroutineType(types: !7)
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!7 = !{!8, !8}
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!8 = !DICompositeType(tag: DW_TAG_structure_type, name: "foo", line: 2, size: 8, align: 8, file: !1, scope: !5, elements: !9)
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!9 = !{!10}
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!10 = !DISubprogram(name: "foo", line: 3, isLocal: false, isDefinition: false, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, scopeLine: 3, file: !1, scope: !8, type: !11)
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!11 = !DISubroutineType(types: !12)
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!12 = !{null, !13, !14}
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!13 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !8)
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!14 = !DIDerivedType(tag: DW_TAG_reference_type, baseType: !15)
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!15 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !8)
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!17 = distinct !DISubprogram(name: "func2", linkageName: "_ZN7pr147635func2EbNS_3fooE", line: 12, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, scopeLine: 12, file: !1, scope: !5, type: !18, retainedNodes: !2)
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!18 = !DISubroutineType(types: !19)
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!19 = !{null, !20, !8}
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!20 = !DIBasicType(tag: DW_TAG_base_type, name: "bool", size: 8, align: 8, encoding: DW_ATE_boolean)
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!21 = !{i32 2, !"Dwarf Version", i32 3}
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!22 = !DILocalVariable(name: "f", line: 6, arg: 1, scope: !4, file: !23, type: !8)
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!23 = !DIFile(filename: "pass.cpp", directory: "/tmp")
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!24 = !DILocation(line: 6, scope: !4)
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!25 = !DILocation(line: 7, scope: !4)
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!26 = !DILocalVariable(name: "b", line: 12, arg: 1, scope: !17, file: !23, type: !20)
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!27 = !DILocation(line: 12, scope: !17)
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!28 = !DILocalVariable(name: "g", line: 12, arg: 2, scope: !17, file: !23, type: !8)
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!29 = !DILocation(line: 13, scope: !30)
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!30 = distinct !DILexicalBlock(line: 13, column: 0, file: !1, scope: !17)
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!31 = !DILocation(line: 14, scope: !30)
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!32 = !DILocation(line: 15, scope: !17)
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!33 = !{i32 1, !"Debug Info Version", i32 3}
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