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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
24 lines
841 B
LLVM
24 lines
841 B
LLVM
; RUN: %llc_dwarf -filetype=obj -o - %s | llvm-dwarfdump - | FileCheck %s
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target datalayout = "e-p:64:64"
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target triple = "x86_64-unknown-linux-gnu"
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; CHECK: DW_TAG_variable
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; CHECK: DW_AT_name {{.*}}"a"
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; CHECK-NOT: DW_AT_location
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; CHECK: DW_TAG
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang", file: !5, globals: !1, emissionKind: FullDebug)
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!1 = !{!2}
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!2 = !DIGlobalVariableExpression(var: !3, expr: !4)
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!3 = distinct !DIGlobalVariable(name: "a", scope: null, isLocal: false, isDefinition: true, type: !6)
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!4 = !DIExpression(DW_OP_plus, 4)
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!5 = !DIFile(filename: "<stdin>", directory: "/")
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!6 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!7 = !{i32 2, !"Dwarf Version", i32 2}
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!8 = !{i32 2, !"Debug Info Version", i32 3}
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!7, !8}
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