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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, variables: !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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