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7b500b4bdf
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
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@290153 91177308-0d34-0410-b5e6-96231b3b80d8
26 lines
1.2 KiB
LLVM
26 lines
1.2 KiB
LLVM
; RUN: llvm-link -S %s %S/debug-info-version-a.ll | FileCheck %s
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source_filename = "debug-info-global-var.c"
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target datalayout = "e-m:o-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.12.0"
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; CHECK: @g = global i32 0, align 4, !dbg ![[G:[0-9]+]]{{$}}
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@g = global i32 0, align 4, !dbg !0
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!llvm.dbg.cu = !{!1}
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!llvm.module.flags = !{!6, !7, !8}
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!llvm.ident = !{!9}
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; CHECK: ![[G]] = !DIGlobalVariableExpression(var: ![[GVAR:.*]])
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; CHECK: ![[GVAR]] = distinct !DIGlobalVariable(name: "g"
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!0 = !DIGlobalVariableExpression(var: !10)
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!1 = distinct !DICompileUnit(language: DW_LANG_C99, file: !2, producer: "clang", isOptimized: false, runtimeVersion: 0, emissionKind: FullDebug, enums: !3, globals: !4)
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!2 = !DIFile(filename: "debug-info-global-var.c", directory: "/")
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!3 = !{}
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!4 = !{!0}
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!5 = !DIBasicType(name: "int", size: 32, encoding: DW_ATE_signed)
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!6 = !{i32 2, !"Dwarf Version", i32 4}
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = !{i32 1, !"PIC Level", i32 2}
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!9 = !{!"clang version 4.0.0 (trunk 286129) (llvm/trunk 286128)"}
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!10 = distinct !DIGlobalVariable(name: "g", scope: !1, file: !2, line: 1, type: !5, isLocal: false, isDefinition: true)
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