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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
100 lines
3.8 KiB
LLVM
100 lines
3.8 KiB
LLVM
; RUN: llc %s -o %t.s
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; RUN: llvm-mc %t.s -filetype=obj -triple=x86_64-windows-msvc -o %t.o
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; RUN: FileCheck %s < %t.s --check-prefix=ASM
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; RUN: llvm-dwarfdump %t.o | FileCheck %s --check-prefix=DWARF
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; In this example, the variable lives mostly in memory, but at the point of the
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; assignment to global, it lives nowhere, and is described as the constant
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; value 1.
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; C source:
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;
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; void escape(int *);
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; extern int global;
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; void f(int x) {
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; escape(&x);
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; x = 1; // DSE should delete and insert dbg.value(i32 1)
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; global = x;
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; x = 2; // DSE should insert dbg.addr
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; escape(&x);
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; }
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; ModuleID = 'dse.c'
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source_filename = "dse.c"
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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-msvc19.0.24215"
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declare void @llvm.dbg.addr(metadata, metadata, metadata) #2
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declare void @llvm.dbg.value(metadata, metadata, metadata) #2
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declare void @escape(i32*)
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@global = external global i32, align 4
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; Function Attrs: nounwind uwtable
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define void @f(i32 %x) #0 !dbg !8 {
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entry:
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%x.addr = alloca i32, align 4
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store i32 %x, i32* %x.addr, align 4
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call void @llvm.dbg.addr(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !18
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call void @escape(i32* %x.addr), !dbg !19
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call void @llvm.dbg.value(metadata i32 1, metadata !13, metadata !DIExpression()), !dbg !20
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store i32 1, i32* @global, align 4, !dbg !22
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call void @llvm.dbg.addr(metadata i32* %x.addr, metadata !13, metadata !DIExpression()), !dbg !23
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store i32 2, i32* %x.addr, align 4, !dbg !23
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call void @escape(i32* %x.addr), !dbg !24
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ret void, !dbg !25
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}
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; ASM-LABEL: f: # @f
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; ASM: movl %ecx, [[OFF_X:[0-9]+]](%rsp)
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; ASM: #DEBUG_VALUE: f:x <- [DW_OP_plus_uconst [[OFF_X]]] [$rsp+0]
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; ASM: callq escape
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; ASM: #DEBUG_VALUE: f:x <- 1
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; ASM: movl $1, global(%rip)
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; FIXME: Needs a fix to LiveDebugVariables
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; ASMX: #DEBUG_VALUE: f:x <- [DW_OP_plus_uconst [[OFF_X]]] [$rsp+0]
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; ASM: movl $2, [[OFF_X]](%rsp)
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; ASM: callq escape
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; ASM: retq
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; DWARF: DW_TAG_formal_parameter
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; DWARF-NEXT: DW_AT_location (0x00000000
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; DWARF-NEXT: {{[^:]*}}: DW_OP_breg7 RSP+{{[0-9]+}}
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; DWARF-NEXT: {{[^:]*}}: DW_OP_consts +1, DW_OP_stack_value
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; DWARF-NEXT: {{[^:]*}}: DW_OP_breg7 RSP+{{[0-9]+}})
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; DWARF-NEXT: DW_AT_name ("x")
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attributes #0 = { nounwind uwtable }
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attributes #2 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5, !6}
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!llvm.ident = !{!7}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "dse.c", directory: "C:\5Csrc\5Cllvm-project\5Cbuild")
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!2 = !{}
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!3 = !{i32 2, !"Dwarf Version", i32 4}
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!4 = !{i32 2, !"Debug Info Version", i32 3}
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!5 = !{i32 1, !"wchar_size", i32 2}
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!6 = !{i32 7, !"PIC Level", i32 2}
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!7 = !{!"clang version 6.0.0 "}
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!8 = distinct !DISubprogram(name: "f", scope: !1, file: !1, line: 3, type: !9, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: true, unit: !0, retainedNodes: !12)
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!9 = !DISubroutineType(types: !10)
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!10 = !{null, !11}
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!11 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!12 = !{!13}
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!13 = !DILocalVariable(name: "x", arg: 1, scope: !8, file: !1, line: 3, type: !11)
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!14 = !{!15, !15, i64 0}
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!15 = !{!"int", !16, i64 0}
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!16 = !{!"omnipotent char", !17, i64 0}
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!17 = !{!"Simple C/C++ TBAA"}
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!18 = !DILocation(line: 3, column: 12, scope: !8)
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!19 = !DILocation(line: 4, column: 3, scope: !8)
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!20 = !DILocation(line: 5, column: 5, scope: !8)
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!21 = !DILocation(line: 6, column: 12, scope: !8)
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!22 = !DILocation(line: 6, column: 10, scope: !8)
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!23 = !DILocation(line: 7, column: 5, scope: !8)
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!24 = !DILocation(line: 8, column: 3, scope: !8)
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!25 = !DILocation(line: 9, column: 1, scope: !8)
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