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llvm-6502/test/Transforms/ObjCARC/ensure-that-exception-unwind-path-is-visited.ll
Rafael Espindola 1f21e0dd0d Remove the linker_private and linker_private_weak linkages. 
These linkages were introduced some time ago, but it was never very
clear what exactly their semantics were or what they should be used
for. Some investigation found these uses:

* utf-16 strings in clang.
* non-unnamed_addr strings produced by the sanitizers.

It turns out they were just working around a more fundamental problem.
For some sections a MachO linker needs a symbol in order to split the
section into atoms, and llvm had no idea that was the case. I fixed
that in r201700 and it is now safe to use the private linkage. When
the object ends up in a section that requires symbols, llvm will use a
'l' prefix instead of a 'L' prefix and things just work.

With that, these linkages were already dead, but there was a potential
future user in the objc metadata information. I am still looking at
CGObjcMac.cpp, but at this point I am convinced that linker_private
and linker_private_weak are not what they need.

The objc uses are currently split in

* Regular symbols (no '\01' prefix). LLVM already directly provides
whatever semantics they need.
* Uses of a private name (start with "\01L" or "\01l") and private
linkage. We can drop the "\01L" and "\01l" prefixes as soon as llvm
agrees with clang on L being ok or not for a given section. I have two
patches in code review for this.
* Uses of private name and weak linkage.

The last case is the one that one could think would fit one of these
linkages. That is not the case. The semantics are

* the linker will merge these symbol by *name*.
* the linker will hide them in the final DSO.

Given that the merging is done by name, any of the private (or
internal) linkages would be a bad match. They allow llvm to rename the
symbols, and that is really not what we want. From the llvm point of
view, these objects should really be (linkonce|weak)(_odr)?.

For now, just keeping the "\01l" prefix is probably the best for these
symbols. If we one day want to have a more direct support in llvm,
IMHO what we should add is not a linkage, it is just a hidden_symbol
attribute. It would be applicable to multiple linkages. For example,
on weak it would produce the current behavior we have for objc
metadata. On internal, it would be equivalent to private (and we
should then remove private).

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203866 91177308-0d34-0410-b5e6-96231b3b80d8
2014-03-13 23:18:37 +00:00

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; RUN: opt -objc-arc -S < %s | FileCheck %s
; rdar://11744105
; bugzilla://14584
target datalayout = "e-p:64:64:64-i1:8:8-i8:8:8-i16:16:16-i32:32:32-i64:64:64-f32:32:32-f64:64:64-v64:64:64-v128:128:128-a0:0:64-s0:64:64-f80:128:128-n8:16:32:64-S128"
target triple = "x86_64-apple-macosx10.9.0"
%0 = type opaque
%struct._class_t = type { %struct._class_t*, %struct._class_t*, %struct._objc_cache*, i8* (i8*, i8*)**, %struct._class_ro_t* }
%struct._objc_cache = type opaque
%struct._class_ro_t = type { i32, i32, i32, i8*, i8*, %struct.__method_list_t*, %struct._objc_protocol_list*, %struct._ivar_list_t*, i8*, %struct._prop_list_t* }
%struct.__method_list_t = type { i32, i32, [0 x %struct._objc_method] }
%struct._objc_method = type { i8*, i8*, i8* }
%struct._objc_protocol_list = type { i64, [0 x %struct._protocol_t*] }
%struct._protocol_t = type { i8*, i8*, %struct._objc_protocol_list*, %struct.__method_list_t*, %struct.__method_list_t*, %struct.__method_list_t*, %struct.__method_list_t*, %struct._prop_list_t*, i32, i32, i8** }
%struct._prop_list_t = type { i32, i32, [0 x %struct._prop_t] }
%struct._prop_t = type { i8*, i8* }
%struct._ivar_list_t = type { i32, i32, [0 x %struct._ivar_t] }
%struct._ivar_t = type { i64*, i8*, i8*, i32, i32 }
%struct.NSConstantString = type { i32*, i32, i8*, i64 }
@"OBJC_CLASS_$_NSObject" = external global %struct._class_t
@"\01L_OBJC_CLASSLIST_REFERENCES_$_" = internal global %struct._class_t* @"OBJC_CLASS_$_NSObject", section "__DATA, __objc_classrefs, regular, no_dead_strip", align 8
@"\01L_OBJC_METH_VAR_NAME_" = internal global [4 x i8] c"new\00", section "__TEXT,__objc_methname,cstring_literals", align 1
@"\01L_OBJC_SELECTOR_REFERENCES_" = internal global i8* getelementptr inbounds ([4 x i8]* @"\01L_OBJC_METH_VAR_NAME_", i64 0, i64 0), section "__DATA, __objc_selrefs, literal_pointers, no_dead_strip"
@__CFConstantStringClassReference = external global [0 x i32]
@.str = private unnamed_addr constant [11 x i8] c"Failed: %@\00", align 1
@_unnamed_cfstring_ = private constant %struct.NSConstantString { i32* getelementptr inbounds ([0 x i32]* @__CFConstantStringClassReference, i32 0, i32 0), i32 1992, i8* getelementptr inbounds ([11 x i8]* @.str, i32 0, i32 0), i64 10 }, section "__DATA,__cfstring"
@"OBJC_CLASS_$_NSException" = external global %struct._class_t
@"\01L_OBJC_CLASSLIST_REFERENCES_$_1" = internal global %struct._class_t* @"OBJC_CLASS_$_NSException", section "__DATA, __objc_classrefs, regular, no_dead_strip", align 8
@.str2 = private unnamed_addr constant [4 x i8] c"Foo\00", align 1
@_unnamed_cfstring_3 = private constant %struct.NSConstantString { i32* getelementptr inbounds ([0 x i32]* @__CFConstantStringClassReference, i32 0, i32 0), i32 1992, i8* getelementptr inbounds ([4 x i8]* @.str2, i32 0, i32 0), i64 3 }, section "__DATA,__cfstring"
@"\01L_OBJC_METH_VAR_NAME_4" = internal global [14 x i8] c"raise:format:\00", section "__TEXT,__objc_methname,cstring_literals", align 1
@"\01L_OBJC_SELECTOR_REFERENCES_5" = internal global i8* getelementptr inbounds ([14 x i8]* @"\01L_OBJC_METH_VAR_NAME_4", i64 0, i64 0), section "__DATA, __objc_selrefs, literal_pointers, no_dead_strip"
@llvm.used = appending global [6 x i8*] [i8* bitcast (%struct._class_t** @"\01L_OBJC_CLASSLIST_REFERENCES_$_" to i8*), i8* getelementptr inbounds ([4 x i8]* @"\01L_OBJC_METH_VAR_NAME_", i32 0, i32 0), i8* bitcast (i8** @"\01L_OBJC_SELECTOR_REFERENCES_" to i8*), i8* bitcast (%struct._class_t** @"\01L_OBJC_CLASSLIST_REFERENCES_$_1" to i8*), i8* getelementptr inbounds ([14 x i8]* @"\01L_OBJC_METH_VAR_NAME_4", i32 0, i32 0), i8* bitcast (i8** @"\01L_OBJC_SELECTOR_REFERENCES_5" to i8*)], section "llvm.metadata"
define i32 @main() uwtable ssp {
entry:
%tmp = load %struct._class_t** @"\01L_OBJC_CLASSLIST_REFERENCES_$_", align 8, !dbg !37
%tmp1 = load i8** @"\01L_OBJC_SELECTOR_REFERENCES_", align 8, !dbg !37, !invariant.load !38
%tmp2 = bitcast %struct._class_t* %tmp to i8*, !dbg !37
; CHECK: call i8* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to i8* (i8*, i8*)*)(i8* %tmp2, i8* %tmp1)
%call = call i8* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to i8* (i8*, i8*)*)(i8* %tmp2, i8* %tmp1), !dbg !37, !clang.arc.no_objc_arc_exceptions !38
call void @llvm.dbg.value(metadata !{i8* %call}, i64 0, metadata !12), !dbg !37
; CHECK: call i8* @objc_retain(i8* %call) [[NUW:#[0-9]+]]
%tmp3 = call i8* @objc_retain(i8* %call) nounwind, !dbg !39
call void @llvm.dbg.value(metadata !{i8* %call}, i64 0, metadata !25), !dbg !39
invoke fastcc void @ThrowFunc(i8* %call)
to label %eh.cont unwind label %lpad, !dbg !40, !clang.arc.no_objc_arc_exceptions !38
eh.cont: ; preds = %entry
; CHECK: call void @objc_release(i8* %call)
call void @objc_release(i8* %call) nounwind, !dbg !42, !clang.imprecise_release !38
br label %if.end, !dbg !43
lpad: ; preds = %entry
%tmp4 = landingpad { i8*, i32 } personality i8* bitcast (i32 (...)* @__objc_personality_v0 to i8*)
catch i8* null, !dbg !40
%tmp5 = extractvalue { i8*, i32 } %tmp4, 0, !dbg !40
%exn.adjusted = call i8* @objc_begin_catch(i8* %tmp5) nounwind, !dbg !44
call void @llvm.dbg.value(metadata !45, i64 0, metadata !21), !dbg !46
call void @objc_end_catch(), !dbg !49, !clang.arc.no_objc_arc_exceptions !38
; CHECK: call void @objc_release(i8* %call)
call void @objc_release(i8* %call) nounwind, !dbg !42, !clang.imprecise_release !38
call void (i8*, ...)* @NSLog(i8* bitcast (%struct.NSConstantString* @_unnamed_cfstring_ to i8*), i8* %call), !dbg !50, !clang.arc.no_objc_arc_exceptions !38
br label %if.end, !dbg !52
if.end: ; preds = %lpad, %eh.cont
call void (i8*, ...)* @NSLog(i8* bitcast (%struct.NSConstantString* @_unnamed_cfstring_ to i8*), i8* %call), !dbg !53, !clang.arc.no_objc_arc_exceptions !38
; CHECK: call void @objc_release(i8* %call)
call void @objc_release(i8* %call) nounwind, !dbg !54, !clang.imprecise_release !38
ret i32 0, !dbg !54
}
declare void @llvm.dbg.declare(metadata, metadata) nounwind readnone
declare i8* @objc_msgSend(i8*, i8*, ...) nonlazybind
declare i8* @objc_retain(i8*) nonlazybind
declare i8* @objc_begin_catch(i8*)
declare void @objc_end_catch()
declare void @objc_exception_rethrow()
define internal fastcc void @ThrowFunc(i8* %obj) uwtable noinline ssp {
entry:
%tmp = call i8* @objc_retain(i8* %obj) nounwind
call void @llvm.dbg.value(metadata !{i8* %obj}, i64 0, metadata !32), !dbg !55
%tmp1 = load %struct._class_t** @"\01L_OBJC_CLASSLIST_REFERENCES_$_1", align 8, !dbg !56
%tmp2 = load i8** @"\01L_OBJC_SELECTOR_REFERENCES_5", align 8, !dbg !56, !invariant.load !38
%tmp3 = bitcast %struct._class_t* %tmp1 to i8*, !dbg !56
call void (i8*, i8*, %0*, %0*, ...)* bitcast (i8* (i8*, i8*, ...)* @objc_msgSend to void (i8*, i8*, %0*, %0*, ...)*)(i8* %tmp3, i8* %tmp2, %0* bitcast (%struct.NSConstantString* @_unnamed_cfstring_3 to %0*), %0* bitcast (%struct.NSConstantString* @_unnamed_cfstring_3 to %0*)), !dbg !56, !clang.arc.no_objc_arc_exceptions !38
call void @objc_release(i8* %obj) nounwind, !dbg !58, !clang.imprecise_release !38
ret void, !dbg !58
}
declare i32 @__objc_personality_v0(...)
declare void @objc_release(i8*) nonlazybind
declare void @NSLog(i8*, ...)
declare void @llvm.dbg.value(metadata, i64, metadata) nounwind readnone
; CHECK: attributes #0 = { ssp uwtable }
; CHECK: attributes #1 = { nounwind readnone }
; CHECK: attributes #2 = { nonlazybind }
; CHECK: attributes #3 = { noinline ssp uwtable }
; CHECK: attributes [[NUW]] = { nounwind }
!llvm.dbg.cu = !{!0}
!llvm.module.flags = !{!33, !34, !35, !36, !61}
!0 = metadata !{i32 786449, metadata !60, i32 16, metadata !"clang version 3.3 ", i1 true, metadata !"", i32 2, metadata !1, metadata !1, metadata !3, metadata !1, null, metadata !""} ; [ DW_TAG_compile_unit ] [/Volumes/Files/gottesmmcab/Radar/12906997/test.m] [DW_LANG_ObjC]
!1 = metadata !{i32 0}
!3 = metadata !{metadata !5, metadata !27}
!5 = metadata !{i32 786478, metadata !60, metadata !6, metadata !"main", metadata !"main", metadata !"", i32 9, metadata !7, i1 false, i1 true, i32 0, i32 0, null, i32 0, i1 true, i32 ()* @main, null, null, metadata !10, i32 10} ; [ DW_TAG_subprogram ] [line 9] [def] [scope 10] [main]
!6 = metadata !{i32 786473, metadata !60} ; [ DW_TAG_file_type ]
!7 = metadata !{i32 786453, i32 0, null, i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !8, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!8 = metadata !{metadata !9}
!9 = metadata !{i32 786468, null, null, metadata !"int", i32 0, i64 32, i64 32, i64 0, i32 0, i32 5} ; [ DW_TAG_base_type ] [int] [line 0, size 32, align 32, offset 0, enc DW_ATE_signed]
!10 = metadata !{metadata !11}
!11 = metadata !{metadata !12, metadata !21, metadata !25}
!12 = metadata !{i32 786688, metadata !13, metadata !"obj", metadata !6, i32 11, metadata !14, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [obj] [line 11]
!13 = metadata !{i32 786443, metadata !60, metadata !5, i32 10, i32 0, i32 0} ; [ DW_TAG_lexical_block ] [/Volumes/Files/gottesmmcab/Radar/12906997/test.m]
!14 = metadata !{i32 786454, metadata !60, null, metadata !"id", i32 11, i64 0, i64 0, i64 0, i32 0, metadata !15} ; [ DW_TAG_typedef ] [id] [line 11, size 0, align 0, offset 0] [from ]
!15 = metadata !{i32 786447, metadata !60, null, metadata !"", i32 0, i64 64, i64 64, i64 0, i32 0, metadata !16} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 64, offset 0] [from objc_object]
!16 = metadata !{i32 786451, metadata !60, null, metadata !"objc_object", i32 0, i64 0, i64 0, i32 0, i32 0, null, metadata !17, i32 0, null, i32 0, null} ; [ DW_TAG_structure_type ] [objc_object] [line 0, size 0, align 0, offset 0] [def] [from ]
!17 = metadata !{metadata !18}
!18 = metadata !{i32 786445, metadata !60, metadata !16, metadata !"isa", i32 0, i64 64, i64 0, i64 0, i32 0, metadata !19} ; [ DW_TAG_member ] [isa] [line 0, size 64, align 0, offset 0] [from ]
!19 = metadata !{i32 786447, null, null, metadata !"", i32 0, i64 64, i64 0, i64 0, i32 0, metadata !20} ; [ DW_TAG_pointer_type ] [line 0, size 64, align 0, offset 0] [from objc_class]
!20 = metadata !{i32 786451, metadata !60, null, metadata !"objc_class", i32 0, i64 0, i64 0, i32 0, i32 4, null, null, i32 0, null, null, null} ; [ DW_TAG_structure_type ] [objc_class] [line 0, size 0, align 0, offset 0] [decl] [from ]
!21 = metadata !{i32 786688, metadata !22, metadata !"ok", metadata !6, i32 13, metadata !23, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [ok] [line 13]
!22 = metadata !{i32 786443, metadata !60, metadata !13, i32 12, i32 0, i32 1} ; [ DW_TAG_lexical_block ] [/Volumes/Files/gottesmmcab/Radar/12906997/test.m]
!23 = metadata !{i32 786454, metadata !60, null, metadata !"BOOL", i32 62, i64 0, i64 0, i64 0, i32 0, metadata !24} ; [ DW_TAG_typedef ] [BOOL] [line 62, size 0, align 0, offset 0] [from signed char]
!24 = metadata !{i32 786468, null, null, metadata !"signed char", i32 0, i64 8, i64 8, i64 0, i32 0, i32 6} ; [ DW_TAG_base_type ] [signed char] [line 0, size 8, align 8, offset 0, enc DW_ATE_signed_char]
!25 = metadata !{i32 786688, metadata !26, metadata !"obj2", metadata !6, i32 15, metadata !14, i32 0, i32 0} ; [ DW_TAG_auto_variable ] [obj2] [line 15]
!26 = metadata !{i32 786443, metadata !60, metadata !22, i32 14, i32 0, i32 2} ; [ DW_TAG_lexical_block ] [/Volumes/Files/gottesmmcab/Radar/12906997/test.m]
!27 = metadata !{i32 786478, metadata !60, metadata !6, metadata !"ThrowFunc", metadata !"ThrowFunc", metadata !"", i32 4, metadata !28, i1 true, i1 true, i32 0, i32 0, null, i32 256, i1 true, void (i8*)* @ThrowFunc, null, null, metadata !30, i32 5} ; [ DW_TAG_subprogram ] [line 4] [local] [def] [scope 5] [ThrowFunc]
!28 = metadata !{i32 786453, i32 0, null, i32 0, i32 0, i64 0, i64 0, i64 0, i32 0, null, metadata !29, i32 0, null, null, null} ; [ DW_TAG_subroutine_type ] [line 0, size 0, align 0, offset 0] [from ]
!29 = metadata !{null, metadata !14}
!30 = metadata !{metadata !31}
!31 = metadata !{metadata !32}
!32 = metadata !{i32 786689, metadata !27, metadata !"obj", metadata !6, i32 16777220, metadata !14, i32 0, i32 0} ; [ DW_TAG_arg_variable ] [obj] [line 4]
!33 = metadata !{i32 1, metadata !"Objective-C Version", i32 2}
!34 = metadata !{i32 1, metadata !"Objective-C Image Info Version", i32 0}
!35 = metadata !{i32 1, metadata !"Objective-C Image Info Section", metadata !"__DATA, __objc_imageinfo, regular, no_dead_strip"}
!36 = metadata !{i32 4, metadata !"Objective-C Garbage Collection", i32 0}
!37 = metadata !{i32 11, i32 0, metadata !13, null}
!38 = metadata !{}
!39 = metadata !{i32 15, i32 0, metadata !26, null}
!40 = metadata !{i32 17, i32 0, metadata !41, null}
!41 = metadata !{i32 786443, metadata !60, metadata !26, i32 16, i32 0, i32 3} ; [ DW_TAG_lexical_block ] [/Volumes/Files/gottesmmcab/Radar/12906997/test.m]
!42 = metadata !{i32 22, i32 0, metadata !26, null}
!43 = metadata !{i32 23, i32 0, metadata !22, null}
!44 = metadata !{i32 19, i32 0, metadata !41, null}
!45 = metadata !{i8 0}
!46 = metadata !{i32 20, i32 0, metadata !47, null}
!47 = metadata !{i32 786443, metadata !60, metadata !48, i32 19, i32 0, i32 5} ; [ DW_TAG_lexical_block ] [/Volumes/Files/gottesmmcab/Radar/12906997/test.m]
!48 = metadata !{i32 786443, metadata !60, metadata !26, i32 19, i32 0, i32 4} ; [ DW_TAG_lexical_block ] [/Volumes/Files/gottesmmcab/Radar/12906997/test.m]
!49 = metadata !{i32 21, i32 0, metadata !47, null}
!50 = metadata !{i32 24, i32 0, metadata !51, null}
!51 = metadata !{i32 786443, metadata !60, metadata !22, i32 23, i32 0, i32 6} ; [ DW_TAG_lexical_block ] [/Volumes/Files/gottesmmcab/Radar/12906997/test.m]
!52 = metadata !{i32 25, i32 0, metadata !51, null}
!53 = metadata !{i32 27, i32 0, metadata !13, null}
!54 = metadata !{i32 28, i32 0, metadata !13, null}
!55 = metadata !{i32 4, i32 0, metadata !27, null}
!56 = metadata !{i32 6, i32 0, metadata !57, null}
!57 = metadata !{i32 786443, metadata !60, metadata !27, i32 5, i32 0, i32 7} ; [ DW_TAG_lexical_block ] [/Volumes/Files/gottesmmcab/Radar/12906997/test.m]
!58 = metadata !{i32 7, i32 0, metadata !57, null}
!60 = metadata !{metadata !"test.m", metadata !"/Volumes/Files/gottesmmcab/Radar/12906997"}
!61 = metadata !{i32 1, metadata !"Debug Info Version", i32 1}
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