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cf7e846d11
This patch implements PR31013 by introducing a
DIGlobalVariableExpression that holds a pair of DIGlobalVariable and
DIExpression.
Currently, DIGlobalVariables holds a DIExpression. This is not the
best way to model this:
(1) The DIGlobalVariable should describe the source level variable,
not how to get to its location.
(2) It makes it unsafe/hard to update the expressions when we call
replaceExpression on the DIGLobalVariable.
(3) It makes it impossible to represent a global variable that is in
more than one location (e.g., a variable with multiple
DW_OP_LLVM_fragment-s). We also moved away from attaching the
DIExpression to DILocalVariable for the same reasons.
This reapplies r289902 with additional testcase upgrades and a change
to the Bitcode record for DIGlobalVariable, that makes upgrading the
old format unambiguous also for variables without DIExpressions.
<rdar://problem/29250149>
https://llvm.org/bugs/show_bug.cgi?id=31013
Differential Revision: https://reviews.llvm.org/D26769
llvm-svn: 290153
35 lines
1.8 KiB
LLVM
35 lines
1.8 KiB
LLVM
; RUN: llc -O0 < %s | FileCheck %s
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; Radar 10464995
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target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.7.2"
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@s = common global [4294967296 x i8] zeroinitializer, align 16, !dbg !13
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; CHECK: .quad 4294967296 ## DW_AT_count
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define void @bar() nounwind uwtable ssp !dbg !5 {
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entry:
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store i8 97, i8* getelementptr inbounds ([4294967296 x i8], [4294967296 x i8]* @s, i32 0, i64 0), align 1, !dbg !18
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ret void, !dbg !20
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}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!22}
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!0 = distinct !DICompileUnit(language: DW_LANG_C99, producer: "clang version 3.1 (trunk 144833)", isOptimized: false, emissionKind: FullDebug, file: !21, enums: !1, retainedTypes: !1, globals: !11, imports: !1)
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!1 = !{}
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!5 = distinct !DISubprogram(name: "bar", line: 4, isLocal: false, isDefinition: true, virtualIndex: 6, flags: DIFlagPrototyped, isOptimized: false, unit: !0, file: !21, scope: !6, type: !7)
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!6 = !DIFile(filename: "small.c", directory: "/private/tmp")
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!7 = !DISubroutineType(types: !8)
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!8 = !{null}
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!11 = !{!13}
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!13 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "s", line: 2, isLocal: false, isDefinition: true, scope: null, file: !6, type: !14))
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!14 = !DICompositeType(tag: DW_TAG_array_type, size: 34359738368, align: 8, baseType: !15, elements: !16)
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!15 = !DIBasicType(tag: DW_TAG_base_type, name: "char", size: 8, align: 8, encoding: DW_ATE_signed_char)
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!16 = !{!17}
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!17 = !DISubrange(count: 4294967296)
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!18 = !DILocation(line: 5, column: 3, scope: !19)
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!19 = distinct !DILexicalBlock(line: 4, column: 1, file: !21, scope: !5)
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!20 = !DILocation(line: 6, column: 1, scope: !19)
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!21 = !DIFile(filename: "small.c", directory: "/private/tmp")
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!22 = !{i32 1, !"Debug Info Version", i32 3}
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