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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
82 lines
3.1 KiB
LLVM
82 lines
3.1 KiB
LLVM
; RUN: llc -generate-arange-section < %s | FileCheck %s
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; -- header --
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; CHECK: .short 2 # DWARF Arange version number
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; CHECK-NEXT: .long .Lcu_begin0
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; CHECK-NEXT: .byte 8 # Address Size (in bytes)
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; CHECK-NEXT: .byte 0 # Segment Size (in bytes)
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; -- alignment --
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; CHECK-NEXT: .zero 4,255
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; <data section> - it should have made one span covering all vars in this CU.
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; CHECK-NEXT: .quad some_data
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; CHECK-NEXT: .quad .Lsec_end0-some_data
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; <other sections> - it should have made one span covering all vars in this CU.
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; CHECK-NEXT: .quad some_other
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; CHECK-NEXT: .quad .Lsec_end1-some_other
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; <common symbols> - it should have made one span for each symbol.
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; CHECK-NEXT: .quad some_bss
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; CHECK-NEXT: .quad 4
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; <text section> - it should have made one span covering all functions in this CU.
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; CHECK-NEXT: .quad .Lfunc_begin0
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; CHECK-NEXT: .quad .Lsec_end2-.Lfunc_begin0
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; -- finish --
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; CHECK-NEXT: # ARange terminator
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; -- source code --
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; Generated from: "clang -c -g -emit-llvm"
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;
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; int some_data = 4;
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; int some_bss;
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; int some_other __attribute__ ((section ("strange+section"))) = 5;
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;
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; void some_code()
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; {
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; some_bss += some_data + some_other;
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; }
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source_filename = "test/DebugInfo/X86/dwarf-aranges.ll"
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target triple = "x86_64-unknown-linux-gnu"
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@some_data = global i32 4, align 4, !dbg !0
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@some_other = global i32 5, section "strange+section", align 4, !dbg !4
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@some_bss = common global i32 0, align 4, !dbg !6
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define void @some_code() !dbg !13 {
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entry:
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%0 = load i32, i32* @some_data, align 4, !dbg !16
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%1 = load i32, i32* @some_other, align 4, !dbg !16
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%add = add nsw i32 %0, %1, !dbg !16
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%2 = load i32, i32* @some_bss, align 4, !dbg !16
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%add1 = add nsw i32 %2, %add, !dbg !16
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store i32 %add1, i32* @some_bss, align 4, !dbg !16
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ret void, !dbg !17
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}
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!llvm.dbg.cu = !{!8}
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!llvm.module.flags = !{!11, !12}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = !DIGlobalVariable(name: "some_data", scope: null, file: !2, line: 1, type: !3, isLocal: false, isDefinition: true)
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!2 = !DIFile(filename: "test.c", directory: "/home/kayamon")
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!3 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!4 = !DIGlobalVariableExpression(var: !5, expr: !DIExpression())
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!5 = !DIGlobalVariable(name: "some_other", scope: null, file: !2, line: 3, type: !3, isLocal: false, isDefinition: true)
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!6 = !DIGlobalVariableExpression(var: !7, expr: !DIExpression())
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!7 = !DIGlobalVariable(name: "some_bss", scope: null, file: !2, line: 2, type: !3, isLocal: false, isDefinition: true)
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!8 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang version 3.4 ", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !9, retainedTypes: !9, globals: !10, imports: !9)
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!9 = !{}
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!10 = !{!0, !4, !6}
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!11 = !{i32 2, !"Dwarf Version", i32 4}
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!12 = !{i32 1, !"Debug Info Version", i32 3}
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!13 = distinct !DISubprogram(name: "some_code", scope: !2, file: !2, line: 5, type: !14, isLocal: false, isDefinition: true, scopeLine: 6, virtualIndex: 6, isOptimized: false, unit: !8, retainedNodes: !9)
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!14 = !DISubroutineType(types: !15)
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!15 = !{null}
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!16 = !DILocation(line: 7, scope: !13)
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!17 = !DILocation(line: 8, scope: !13)
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