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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
115 lines
5.0 KiB
LLVM
115 lines
5.0 KiB
LLVM
; RUN: llc < %s | FileCheck %s --check-prefix=ASM
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; RUN: llc < %s -filetype=obj | llvm-dwarfdump -v - | FileCheck %s --check-prefix=DWARF
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; Values in registers should be clobbered by calls, which use a regmask instead
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; of individual register def operands.
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; ASM: main: # @main
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; ASM: #DEBUG_VALUE: main:argc <- $ecx
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; ASM: movl $1, x(%rip)
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; ASM: callq clobber
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; ASM-NEXT: [[argc_range_end:.Ltmp[0-9]+]]:
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; Previously LiveDebugValues would claim argc was still in ecx after the call.
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; ASM-NOT: #DEBUG_VALUE: main:argc
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; argc is the first debug location.
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; ASM: .Ldebug_loc1:
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; ASM-NEXT: .quad .Lfunc_begin0-.Lfunc_begin0
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; ASM-NEXT: .quad [[argc_range_end]]-.Lfunc_begin0
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; ASM-NEXT: .short 1 # Loc expr size
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; ASM-NEXT: .byte 82 # super-register DW_OP_reg2
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; argc is the first formal parameter.
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; DWARF: .debug_info contents:
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; DWARF: DW_TAG_formal_parameter
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; DWARF-NEXT: DW_AT_location [DW_FORM_sec_offset] ({{0x.*}}
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; DWARF-NEXT: [0x0000000000000000, 0x0000000000000013): DW_OP_reg2 RCX)
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; DWARF-NEXT: DW_AT_name [DW_FORM_strp] {{.*}} "argc"
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; ModuleID = 't.cpp'
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source_filename = "test/DebugInfo/X86/dbg-value-regmask-clobber.ll"
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target datalayout = "e-m:w-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-pc-windows-msvc18.0.0"
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@x = common global i32 0, align 4, !dbg !0
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; Function Attrs: nounwind uwtable
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define i32 @main(i32 %argc, i8** nocapture readnone %argv) #0 !dbg !12 {
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entry:
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tail call void @llvm.dbg.value(metadata i8** %argv, metadata !19, metadata !21), !dbg !22
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tail call void @llvm.dbg.value(metadata i32 %argc, metadata !20, metadata !21), !dbg !23
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store volatile i32 1, i32* @x, align 4, !dbg !24, !tbaa !25
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tail call void @clobber() #2, !dbg !29
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store volatile i32 2, i32* @x, align 4, !dbg !30, !tbaa !25
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%0 = load volatile i32, i32* @x, align 4, !dbg !31, !tbaa !25
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%tobool = icmp eq i32 %0, 0, !dbg !31
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br i1 %tobool, label %if.else, label %if.then, !dbg !33
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if.then: ; preds = %entry
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store volatile i32 3, i32* @x, align 4, !dbg !34, !tbaa !25
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br label %if.end, !dbg !36
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if.else: ; preds = %entry
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store volatile i32 4, i32* @x, align 4, !dbg !37, !tbaa !25
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br label %if.end
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if.end: ; preds = %if.else, %if.then
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ret i32 0, !dbg !39
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}
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declare void @clobber()
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; Function Attrs: nounwind readnone
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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attributes #0 = { nounwind uwtable }
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attributes #1 = { nounwind readnone }
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attributes #2 = { nounwind }
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!llvm.dbg.cu = !{!2}
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!llvm.module.flags = !{!8, !9, !10}
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!llvm.ident = !{!11}
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!0 = !DIGlobalVariableExpression(var: !1, expr: !DIExpression())
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!1 = !DIGlobalVariable(name: "x", scope: !2, file: !3, line: 1, type: !6, isLocal: false, isDefinition: true)
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!2 = distinct !DICompileUnit(language: DW_LANG_C99, file: !3, producer: "clang version 3.9.0 (trunk 260617) (llvm/trunk 260619)", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !4, globals: !5)
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!3 = !DIFile(filename: "t.cpp", directory: "D:\5Csrc\5Cllvm\5Cbuild")
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!4 = !{}
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!5 = !{!0}
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!6 = !DIDerivedType(tag: DW_TAG_volatile_type, baseType: !7)
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!7 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!8 = !{i32 2, !"Dwarf Version", i32 4}
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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 3.9.0 (trunk 260617) (llvm/trunk 260619)"}
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!12 = distinct !DISubprogram(name: "main", scope: !3, file: !3, line: 4, type: !13, isLocal: false, isDefinition: true, scopeLine: 4, flags: DIFlagPrototyped, isOptimized: true, unit: !2, retainedNodes: !18)
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!13 = !DISubroutineType(types: !14)
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!14 = !{!7, !7, !15}
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!15 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !16, size: 64, align: 64)
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!16 = !DIDerivedType(tag: DW_TAG_pointer_type, baseType: !17, size: 64, align: 64)
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!17 = !DIBasicType(name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!18 = !{!19, !20}
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!19 = !DILocalVariable(name: "argv", arg: 2, scope: !12, file: !3, line: 4, type: !15)
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!20 = !DILocalVariable(name: "argc", arg: 1, scope: !12, file: !3, line: 4, type: !7)
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!21 = !DIExpression()
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!22 = !DILocation(line: 4, column: 27, scope: !12)
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!23 = !DILocation(line: 4, column: 14, scope: !12)
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!24 = !DILocation(line: 5, column: 5, scope: !12)
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!25 = !{!26, !26, i64 0}
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!26 = !{!"int", !27, i64 0}
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!27 = !{!"omnipotent char", !28, i64 0}
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!28 = !{!"Simple C/C++ TBAA"}
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!29 = !DILocation(line: 6, column: 3, scope: !12)
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!30 = !DILocation(line: 7, column: 5, scope: !12)
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!31 = !DILocation(line: 8, column: 7, scope: !32)
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!32 = distinct !DILexicalBlock(scope: !12, file: !3, line: 8, column: 7)
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!33 = !DILocation(line: 8, column: 7, scope: !12)
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!34 = !DILocation(line: 9, column: 7, scope: !35)
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!35 = distinct !DILexicalBlock(scope: !32, file: !3, line: 8, column: 10)
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!36 = !DILocation(line: 10, column: 3, scope: !35)
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!37 = !DILocation(line: 11, column: 7, scope: !38)
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!38 = distinct !DILexicalBlock(scope: !32, file: !3, line: 10, column: 10)
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!39 = !DILocation(line: 13, column: 1, scope: !12)
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