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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
41 lines
2.0 KiB
LLVM
41 lines
2.0 KiB
LLVM
; REQUIRES: object-emission
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; XFAIL: hexagon
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; RUN: %llc_dwarf -filetype=obj -O0 < %s > %t
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; RUN: llvm-dwarfdump -debug-dump=info %t | FileCheck %s
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; CHECK: DW_TAG_ptr_to_member_type
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; CHECK: DW_TAG_ptr_to_member_type
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; CHECK-NEXT: DW_AT_type [DW_FORM_ref4] (cu + {{.*}} => {[[TYPE:0x[0-9a-f]+]]})
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; CHECK: [[TYPE]]: DW_TAG_subroutine_type
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; CHECK: DW_TAG_formal_parameter
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; CHECK-NEXT: DW_AT_type
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; CHECK-NEXT: DW_AT_artificial [DW_FORM_flag
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; IR generated from clang -g with the following source:
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; struct S {
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; };
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;
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; int S::*x = 0;
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; void (S::*y)(int) = 0;
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@x = global i64 -1, align 8, !dbg !5
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@y = global { i64, i64 } zeroinitializer, align 8, !dbg !10
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!16}
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang version 3.3 ", isOptimized: false, emissionKind: FullDebug, file: !15, enums: !1, retainedTypes: !1, globals: !3, imports: !1)
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!1 = !{}
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!3 = !{!5, !10}
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!5 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "x", line: 4, isLocal: false, isDefinition: true, scope: null, file: !6, type: !7))
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!6 = !DIFile(filename: "simple.cpp", directory: "/home/blaikie/Development/scratch")
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!7 = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !8, extraData: !9)
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!8 = !DIBasicType(tag: DW_TAG_base_type, name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!9 = !DICompositeType(tag: DW_TAG_structure_type, name: "S", line: 1, size: 8, align: 8, file: !15, elements: !1)
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!10 = !DIGlobalVariableExpression(var: !DIGlobalVariable(name: "y", line: 5, isLocal: false, isDefinition: true, scope: null, file: !6, type: !11))
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!11 = !DIDerivedType(tag: DW_TAG_ptr_to_member_type, baseType: !12, extraData: !9)
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!12 = !DISubroutineType(types: !13)
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!13 = !{null, !14, !8}
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!14 = !DIDerivedType(tag: DW_TAG_pointer_type, size: 64, align: 64, flags: DIFlagArtificial | DIFlagObjectPointer, baseType: !9)
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!15 = !DIFile(filename: "simple.cpp", directory: "/home/blaikie/Development/scratch")
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!16 = !{i32 1, !"Debug Info Version", i32 3}
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