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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
39 lines
1.4 KiB
LLVM
39 lines
1.4 KiB
LLVM
; RUN: llc -o - %s | FileCheck --check-prefix=CHECK-DWARF2 %s
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; RUN: llc -dwarf-version=4 -o - %s | FileCheck --check-prefix=CHECK-DWARF4 %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-DWARF2: .byte 13 # DW_AT_location
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; CHECK-DWARF2-NEXT: .byte 3
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; CHECK-DWARF2-NEXT: .quad g
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; CHECK-DWARF2-NEXT: .byte 16
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; CHECK-DWARF2-NEXT: .byte 4
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; CHECK-DWARF2-NEXT: .byte 16
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; CHECK-DWARF2-NEXT: .byte 4
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; CHECK-DWARF4: .byte 14 # DW_AT_location
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; CHECK-DWARF4-NEXT: .byte 3
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; CHECK-DWARF4-NEXT: .quad g
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; CHECK-DWARF4-NEXT: .byte 16
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; CHECK-DWARF4-NEXT: .byte 4
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; CHECK-DWARF4-NEXT: .byte 16
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; CHECK-DWARF4-NEXT: .byte 4
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; CHECK-DWARF4-NEXT: .byte 159
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@g = global i32 0, !dbg !2
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!0 = distinct !DICompileUnit(language: DW_LANG_C_plus_plus, producer: "clang", file: !4, globals: !1, emissionKind: FullDebug)
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!1 = !{!2}
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!2 = !DIGlobalVariableExpression(var: !8, expr: !3)
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!3 = !DIExpression(DW_OP_constu, 4, DW_OP_constu, 4, DW_OP_stack_value)
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!4 = !DIFile(filename: "<stdin>", directory: "/")
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!5 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
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!6 = !{i32 2, !"Dwarf Version", i32 2}
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!7 = !{i32 2, !"Debug Info Version", i32 3}
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!8 = distinct !DIGlobalVariable(name: "a", scope: null, isLocal: false, isDefinition: true, type: !5)
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!llvm.dbg.cu = !{!0}
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!llvm.module.flags = !{!6, !7}
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