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0eee52640f
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.
<rdar://problem/29250149>
https://llvm.org/bugs/show_bug.cgi?id=31013
Differential Revision: https://reviews.llvm.org/D26769
llvm-svn: 289902
28 lines
1.4 KiB
LLVM
28 lines
1.4 KiB
LLVM
; RUN: llc -mtriple=x86_64-macosx %s -o %t -filetype=obj
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; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
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; CHECK: DW_TAG_structure_type
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; CHECK: DW_AT_declaration
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; CHECK: DW_AT_APPLE_runtime_class
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%0 = type opaque
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@a = common global %0* null, align 8, !dbg !5
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!9, !10, !11, !12, !14}
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!0 = distinct !DICompileUnit(language: DW_LANG_ObjC, producer: "clang version 3.1 (trunk 152054 trunk 152094)", isOptimized: false, runtimeVersion: 2, emissionKind: FullDebug, file: !13, enums: !1, retainedTypes: !1, globals: !3, imports: !1)
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!1 = !{}
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!3 = !{!5}
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!5 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "a", line: 3, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7))
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!6 = !DIFile(filename: "foo.m", directory: "/Users/echristo")
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!7 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, baseType: !8)
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!8 = !DICompositeType(tag: DW_TAG_structure_type, name: "FooBarBaz", line: 1, flags: DIFlagFwdDecl, runtimeLang: DW_LANG_ObjC, file: !13)
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!9 = !{i32 1, !"Objective-C Version", i32 2}
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!10 = !{i32 1, !"Objective-C Image Info Version", i32 0}
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!11 = !{i32 1, !"Objective-C Image Info Section", !"__DATA, __objc_imageinfo, regular, no_dead_strip"}
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!12 = !{i32 4, !"Objective-C Garbage Collection", i32 0}
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!13 = !DIFile(filename: "foo.m", directory: "/Users/echristo")
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!14 = !{i32 1, !"Debug Info Version", i32 3}
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