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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
1.0 KiB
LLVM
24 lines
1.0 KiB
LLVM
; RUN: llvm-as < %s | llvm-dis | llvm-as | llvm-dis | FileCheck %s
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; RUN: verify-uselistorder %s
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@foo = global i32 0
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; CHECK: !named = !{!0, !1, !2, !3, !4, !5, !6, !7}
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!named = !{!0, !1, !2, !3, !4, !5, !6, !7}
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!0 = !DIFile(filename: "scope.h", directory: "/path/to/dir")
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!1 = distinct !{}
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!2 = !DIFile(filename: "path/to/file", directory: "/path/to/dir")
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!3 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!4 = distinct !{}
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; CHECK: !5 = !DIGlobalVariable(name: "foo", linkageName: "foo", scope: !0, file: !2, line: 7, type: !3, isLocal: true, isDefinition: false, align: 32)
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!5 = !DIGlobalVariable(name: "foo", linkageName: "foo", scope: !0,
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file: !2, line: 7, type: !3, isLocal: true,
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isDefinition: false, align: 32)
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; CHECK: !6 = !DIGlobalVariableExpression(var: !5, expr: !7)
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!6 = !DIGlobalVariableExpression(var: !5, expr: !7)
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; CHECK: !7 = !DIExpression(DW_OP_constu, 42, DW_OP_stack_value)
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!7 = !DIExpression(DW_OP_constu, 42, DW_OP_stack_value)
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