7ed95d1577
I based this off of the API already create for llvm.dbg.value since both intrinsics have the same arguments at the API level. I added some tests exercising the API a little as well as an additional small test that shows how one can use llvm.dbg.addr to limit the PC range where an address value is available in the debugger. This is done by calling llvm.dbg.value with undef and the same metadata info as one used to create the llvm.dbg.addr. rdar://83957028 Reviewed By: aprantl Differential Revision: https://reviews.llvm.org/D117442
107 lines
4.7 KiB
LLVM
107 lines
4.7 KiB
LLVM
;; Run twice -- once with DBG_VALUEs, once with instruction referencing.
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; RUN: llc %s -o %t.s -experimental-debug-variable-locations=false
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; RUN: llvm-mc -triple x86_64--linux %t.s -filetype=obj -o %t.o
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; RUN: FileCheck -input-file=%t.s %s
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; RUN: llvm-dwarfdump %t.o | FileCheck %s --check-prefix=DWARF
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; RUN: llc %s -o %t.s -experimental-debug-variable-locations=true
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; RUN: llvm-mc -triple x86_64--linux %t.s -filetype=obj -o %t.o
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; RUN: FileCheck -input-file=%t.s %s
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; RUN: llvm-dwarfdump %t.o | FileCheck %s --check-prefix=DWARF
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; Unlike dbg.declare, dbg.addr should be lowered to DBG_VALUE instructions. It
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; is control-dependent.
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; CHECK-LABEL: use_dbg_addr:
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; CHECK: #DEBUG_VALUE: use_dbg_addr:o <- [$rsp+0]
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; CHECK-NOT: #DEBUG_VALUE:
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; DWARF: DW_TAG_variable
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; DWARF-NEXT: DW_AT_location (DW_OP_fbreg +0)
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; DWARF-NEXT: DW_AT_name ("o")
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; Make sure that in the second case, we properly get a validity range in the
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; dwarf for the value. This ensures that we can use this technique to invalidate
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; variables.
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; CHECK-LABEL: test_dbg_addr_and_dbg_val_undef
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; CHECK: #DEBUG_VALUE: test_dbg_addr_and_dbg_val_undef:second_o <- [$rsp+0]
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; CHECK: #DEBUG_VALUE: test_dbg_addr_and_dbg_val_undef:second_o <- undef
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; CHECK-NOT: #DEBUG_VALUE:
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; DWARF: DW_TAG_variable
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; DWARF-NEXT: DW_AT_location (0x{{[0-9a-z][0-9a-z]*}}:
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; DWARF-NEXT: [0x{{[0-9a-z][0-9a-z]*}}, 0x{{[0-9a-z][0-9a-z]*}}): DW_OP_breg7 RSP+0)
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; DWARF-NEXT: DW_AT_name ("second_o")
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; ModuleID = 't.c'
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source_filename = "t.c"
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target datalayout = "e-m:e-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64--linux"
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%struct.Foo = type { i32 }
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; Function Attrs: noinline nounwind uwtable
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define void @use_dbg_addr() #0 !dbg !7 {
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entry:
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%o = alloca %struct.Foo, align 4
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call void @llvm.dbg.addr(metadata %struct.Foo* %o, metadata !10, metadata !15), !dbg !16
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call void @escape_foo(%struct.Foo* %o), !dbg !17
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ret void, !dbg !18
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}
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define void @test_dbg_addr_and_dbg_val_undef() #0 !dbg !117 {
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entry:
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%o = alloca %struct.Foo, align 4
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call void @llvm.dbg.addr(metadata %struct.Foo* %o, metadata !1110, metadata !1115), !dbg !1116
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call void @escape_foo(%struct.Foo* %o), !dbg !1117
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call void @llvm.dbg.value(metadata %struct.Foo* undef, metadata !1110, metadata !1115), !dbg !1116
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ret void, !dbg !1118
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}
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; Function Attrs: nounwind readnone speculatable
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declare void @llvm.dbg.addr(metadata, metadata, metadata) #1
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declare void @llvm.dbg.value(metadata, metadata, metadata) #1
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declare void @escape_foo(%struct.Foo*)
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attributes #0 = { noinline nounwind uwtable }
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attributes #1 = { nounwind readnone speculatable }
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!3, !4, !5}
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!llvm.ident = !{!6}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 6.0.0 ", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !2)
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!1 = !DIFile(filename: "t.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 4}
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!6 = !{!"clang version 6.0.0 "}
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!7 = distinct !DISubprogram(name: "use_dbg_addr", scope: !1, file: !1, line: 3, type: !8, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!8 = !DISubroutineType(types: !9)
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!9 = !{null}
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!10 = !DILocalVariable(name: "o", scope: !7, file: !1, line: 4, type: !11)
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!11 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", file: !1, line: 1, size: 32, elements: !12)
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!12 = !{!13}
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!13 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !11, file: !1, line: 1, baseType: !14, size: 32)
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!14 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!15 = !DIExpression()
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!16 = !DILocation(line: 4, column: 14, scope: !7)
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!17 = !DILocation(line: 5, column: 3, scope: !7)
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!18 = !DILocation(line: 6, column: 1, scope: !7)
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!117 = distinct !DISubprogram(name: "test_dbg_addr_and_dbg_val_undef", scope: !1, file: !1, line: 3, type: !118, isLocal: false, isDefinition: true, scopeLine: 3, flags: DIFlagPrototyped, isOptimized: false, unit: !0, retainedNodes: !2)
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!118 = !DISubroutineType(types: !119)
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!119 = !{null}
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!1110 = !DILocalVariable(name: "second_o", scope: !117, file: !1, line: 4, type: !1111)
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!1111 = distinct !DICompositeType(tag: DW_TAG_structure_type, name: "Foo", file: !1, line: 1, size: 32, elements: !1112)
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!1112 = !{!1113}
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!1113 = !DIDerivedType(tag: DW_TAG_member, name: "x", scope: !1111, file: !1, line: 1, baseType: !1114, size: 32)
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!1114 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!1115 = !DIExpression()
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!1116 = !DILocation(line: 4, column: 14, scope: !117)
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!1117 = !DILocation(line: 5, column: 3, scope: !117)
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!1118 = !DILocation(line: 6, column: 1, scope: !117)
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