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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
64 lines
2.4 KiB
LLVM
64 lines
2.4 KiB
LLVM
; RUN: llc -filetype=obj %s -o - | llvm-dwarfdump - | FileCheck %s
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;
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; Generated at -Os from:
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; void *foo(void *dst);
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; void start() {
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; unsigned size;
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; foo(&size);
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; if (size != 0) { // Work around a bug to preserve the dbg.value.
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; }
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; }
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; ModuleID = 'test1.cpp'
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target datalayout = "e-m:o-i64:64-i128:128-n32:64-S128"
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target triple = "arm64-apple-ios"
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; Function Attrs: nounwind optsize
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define void @_Z5startv() #0 !dbg !4 {
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entry:
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%size = alloca i32, align 4
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%0 = bitcast i32* %size to i8*, !dbg !15
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%call = call i8* @_Z3fooPv(i8* %0) #3, !dbg !15
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call void @llvm.dbg.value(metadata i32* %size, metadata !10, metadata !16), !dbg !17
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; CHECK: .debug_info contents:
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; CHECK: DW_TAG_variable
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; CHECK-NEXT: DW_AT_location
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; CHECK-NEXT: DW_OP_breg31 WSP+12, DW_OP_deref
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; CHECK-NEXT: DW_AT_name {{.*}}"size"
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ret void, !dbg !18
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}
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; Function Attrs: optsize
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declare i8* @_Z3fooPv(i8*) #1
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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attributes #0 = { nounwind optsize }
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attributes #1 = { optsize }
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attributes #2 = { nounwind readnone }
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attributes #3 = { nounwind optsize }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!12, !13}
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!llvm.ident = !{!14}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.6.0 (trunk 223149) (llvm/trunk 223115)", isOptimized: true, emissionKind: FullDebug, file: !1, enums: !2, retainedTypes: !2, globals: !2, imports: !2)
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!1 = !DIFile(filename: "<stdin>", directory: "")
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!2 = !{}
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!4 = distinct !DISubprogram(name: "start", linkageName: "_Z5startv", line: 2, isLocal: false, isDefinition: true, flags: DIFlagPrototyped, isOptimized: true, unit: !0, scopeLine: 3, file: !5, scope: !6, type: !7, retainedNodes: !9)
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!5 = !DIFile(filename: "test1.c", directory: "")
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!6 = !DIFile(filename: "test1.c", directory: "")
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!9 = !{!10}
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!10 = !DILocalVariable(name: "size", line: 4, scope: !4, file: !6, type: !11)
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!11 = !DIBasicType(tag: DW_TAG_base_type, name: "unsigned int", size: 32, align: 32, encoding: DW_ATE_unsigned)
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!12 = !{i32 2, !"Dwarf Version", i32 2}
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!13 = !{i32 2, !"Debug Info Version", i32 3}
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!14 = !{!"clang version 3.6.0 (trunk 223149) (llvm/trunk 223115)"}
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!15 = !DILocation(line: 5, column: 3, scope: !4)
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!16 = !DIExpression(DW_OP_deref)
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!17 = !DILocation(line: 4, column: 12, scope: !4)
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!18 = !DILocation(line: 8, column: 1, scope: !4)
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