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PR19623: Implement typedefs of void. 

This the LLVM portion that will allow Clang and other frontends to emit
typedefs of void by providing a null type for the typedef's underlying
type.

llvm-svn: 207777
This commit is contained in:
David Blaikie 2014-05-01 17:56:13 +00:00
parent daff37013c
commit 0f82c225b8
2 changed files with 32 additions and 1 deletions
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1
llvm/lib/IR/DIBuilder.cpp
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@ -355,7 +355,6 @@ DIDerivedType DIBuilder::createReferenceType(unsigned Tag, DIType RTy) {
DIDerivedType DIBuilder::createTypedef(DIType Ty, StringRef Name, DIFile File,
unsigned LineNo, DIDescriptor Context) {
// typedefs are encoded in DIDerivedType format.
assert(Ty.isType() && "Invalid typedef type!");
Value *Elts[] = {
GetTagConstant(VMContext, dwarf::DW_TAG_typedef),
File.getFileNode(),

32
llvm/test/DebugInfo/typedef.ll Normal file
View File

@ -0,0 +1,32 @@
; REQUIRES: object-emission
; RUN: %llc_dwarf -O0 -filetype=obj < %s | llvm-dwarfdump -debug-dump=info - | FileCheck %s
; From source:
; typedef void x;
; x *y;
; Check that a typedef with no DW_TAG_type is produced. The absence of a type is used to imply the 'void' type.
; CHECK: DW_TAG_typedef
; CHECK-NOT: DW_TAG_type
; CHECK: {{DW_TAG|NULL}}
@y = global i8* null, align 8
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!8, !9}
!llvm.ident = !{!10}
!0 = metadata !{i32 786449, metadata !1, i32 4, metadata !"clang version 3.5.0 ", i1 false, metadata !"", i32 0, metadata !2, metadata !2, metadata !2, metadata !3, metadata !2, metadata !"", i32 1} ; [ DW_TAG_compile_unit ] [/tmp/dbginfo/typedef.cpp] [DW_LANG_C_plus_plus]
!1 = metadata !{metadata !"typedef.cpp", metadata !"/tmp/dbginfo"}
!2 = metadata !{}
!3 = metadata !{metadata !4}
!4 = metadata !{i32 786484, i32 0, null, metadata !"y", metadata !"y", metadata !"", metadata !5, i32 2, metadata !6, i32 0, i32 1, i8** @y, null} ; [ DW_TAG_variable ] [y] [line 2] [def]
!5 = metadata !{i32 786473, metadata !1} ; [ DW_TAG_file_type ] [/tmp/dbginfo/typedef.cpp]
!6 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !7} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from x]
!7 = metadata !{i32 786454, metadata !1, null, metadata !"x", i32 1, i64 0, i64 0, i64 0, i32 0, null} ; [ DW_TAG_typedef ] [x] [line 1, size 0, align 0, offset 0] [from ]
!8 = metadata !{i32 2, metadata !"Dwarf Version", i32 4}
!9 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
!10 = metadata !{metadata !"clang version 3.5.0 "}