llvm-mirror/test/Bitcode/diglobalvariable-3.8.ll
Adrian Prantl cf7e846d11 [IR] Remove the DIExpression field from DIGlobalVariable.
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
2016-12-20 02:09:43 +00:00

21 lines
1.1 KiB
LLVM

; RUN: llvm-dis -o - %s.bc | FileCheck %s
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!7, !8}
; CHECK: !0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.1", isOptimized: true, runtimeVersion: 0, emissionKind: FullDebug, enums: !2, globals: !3)
!0 = distinct !DICompileUnit(language: DW_LANG_C99, file: !1, producer: "clang version 3.8.1", isOptimized: true, runtimeVersion: 0, emissionKind: 1, enums: !2, globals: !3)
!1 = !DIFile(filename: "g.c", directory: "/")
!2 = !{}
; CHECK: !3 = !{!4}
!3 = !{!4}
; CHECK: !4 = {{.*}}!DIGlobalVariableExpression(var: !5, expr: !8)
; CHECK: !5 = !DIGlobalVariable(name: "c", scope: !0, file: !1, line: 1, type: !6, isLocal: false, isDefinition: true)
; CHECK: !8 = !DIExpression(DW_OP_constu, 42, DW_OP_stack_value)
!4 = !DIGlobalVariable(name: "c", scope: !0, file: !1, line: 1, type: !5, isLocal: false, isDefinition: true, variable: i32 42)
!5 = !DIDerivedType(tag: DW_TAG_const_type, baseType: !6)
!6 = !DIBasicType(name: "int", size: 32, align: 32, encoding: DW_ATE_signed)
!7 = !{i32 2, !"Dwarf Version", i32 2}
!8 = !{i32 2, !"Debug Info Version", i32 3}