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https://github.com/c64scene-ar/llvm-6502.git
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1f21e0dd0d
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
192 lines
7.3 KiB
LLVM
192 lines
7.3 KiB
LLVM
; RUN: llc < %s -march=sparc -relocation-model=static | FileCheck -check-prefix=V8ABS %s
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; RUN: llc < %s -march=sparc -relocation-model=pic | FileCheck -check-prefix=V8PIC %s
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; RUN: llc < %s -march=sparc -relocation-model=pic -disable-cfi | FileCheck -check-prefix=V8PIC_NOCFI %s
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; RUN: llc < %s -march=sparcv9 -relocation-model=static | FileCheck -check-prefix=V9ABS %s
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; RUN: llc < %s -march=sparcv9 -relocation-model=pic | FileCheck -check-prefix=V9PIC %s
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; RUN: llc < %s -march=sparcv9 -relocation-model=pic -disable-cfi | FileCheck -check-prefix=V9PIC_NOCFI %s
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%struct.__fundamental_type_info_pseudo = type { %struct.__type_info_pseudo }
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%struct.__type_info_pseudo = type { i8*, i8* }
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@_ZTIi = external constant %struct.__fundamental_type_info_pseudo
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@_ZTIf = external constant %struct.__fundamental_type_info_pseudo
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@.cst = private unnamed_addr constant [12 x i8] c"catched int\00", align 64
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@.cst1 = private unnamed_addr constant [14 x i8] c"catched float\00", align 64
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; V8ABS-LABEL: main:
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; V8ABS: .cfi_startproc
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; V8ABS: .cfi_personality 0, __gxx_personality_v0
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; V8ABS: .cfi_lsda 0,
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; V8ABS: .cfi_def_cfa_register {{30|%fp}}
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; V8ABS: .cfi_window_save
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; V8ABS: .cfi_register 15, 31
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; V8ABS: call __cxa_throw
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; V8ABS: call __cxa_throw
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; V8ABS: call __cxa_begin_catch
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; V8ABS: call __cxa_end_catch
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; V8ABS: call __cxa_begin_catch
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; V8ABS: call __cxa_end_catch
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; V8ABS: .cfi_endproc
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; V8PIC-LABEL: main:
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; V8PIC: .cfi_startproc
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; V8PIC: .cfi_personality 155, DW.ref.__gxx_personality_v0
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; V8PIC: .cfi_lsda 27,
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; V8PIC: .cfi_def_cfa_register {{30|%fp}}
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; V8PIC: .cfi_window_save
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; V8PIC: .cfi_register 15, 31
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; V8PIC: .section .gcc_except_table
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; V8PIC-NOT: .section
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; V8PIC: .word %r_disp32(.L_ZTIi.DW.stub)
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; V8PIC: .data
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; V8PIC: .L_ZTIi.DW.stub:
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; V8PIC-NEXT: .word _ZTIi
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; V8PIC_NOCFI-LABEL: main:
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; V8PIC_NOCFI: .section .gcc_except_table
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; V8PIC_NOCFI-NOT: .section
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; V8PIC_NOCFI: .word %r_disp32(.L_ZTIi.DW.stub)
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; V8PIC_NOCFI: .data
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; V8PIC_NOCFI: .L_ZTIi.DW.stub:
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; V8PIC_NOCFI-NEXT: .word _ZTIi
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; V8PIC_NOCFI: .section .eh_frame
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; V8PIC_NOCFI-NOT: .section
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; V8PIC_NOCFI: .byte 15 ! CIE Return Address Column
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; V8PIC_NOCFI: .word %r_disp32(DW.ref.__gxx_personality_v0)
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; V8PIC_NOCFI: .byte 12 ! DW_CFA_def_cfa
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; V8PIC_NOCFI: .byte 14 ! Reg 14
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; V8PIC_NOCFI-NEXT: .byte 0 ! Offset 0
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; V8PIC_NOCFI: .word %r_disp32(.Ltmp{{.+}}) ! FDE initial location
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; V9ABS-LABEL: main:
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; V9ABS: .cfi_startproc
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; V9ABS: .cfi_personality 0, __gxx_personality_v0
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; V9ABS: .cfi_lsda 27,
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; V9ABS: .cfi_def_cfa_register {{30|%fp}}
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; V9ABS: .cfi_window_save
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; V9ABS: .cfi_register 15, 31
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; V9ABS: .section .gcc_except_table
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; V9ABS-NOT: .section
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; V9ABS: .xword _ZTIi
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; V9PIC-LABEL: main:
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; V9PIC: .cfi_startproc
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; V9PIC: .cfi_personality 155, DW.ref.__gxx_personality_v0
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; V9PIC: .cfi_lsda 27,
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; V9PIC: .cfi_def_cfa_register {{30|%fp}}
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; V9PIC: .cfi_window_save
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; V9PIC: .cfi_register 15, 31
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; V9PIC: .section .gcc_except_table
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; V9PIC-NOT: .section
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; V9PIC: .word %r_disp32(.L_ZTIi.DW.stub)
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; V9PIC: .data
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; V9PIC: .L_ZTIi.DW.stub:
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; V9PIC-NEXT: .xword _ZTIi
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; V9PIC_NOCFI-LABEL: main:
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; V9PIC_NOCFI: .section .gcc_except_table
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; V9PIC_NOCFI-NOT: .section
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; V9PIC_NOCFI: .word %r_disp32(.L_ZTIi.DW.stub)
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; V9PIC_NOCFI: .data
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; V9PIC_NOCFI: .L_ZTIi.DW.stub:
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; V9PIC_NOCFI-NEXT: .xword _ZTIi
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; V9PIC_NOCFI: .section .eh_frame
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; V9PIC_NOCFI-NOT: .section
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; V9PIC_NOCFI: .byte 15 ! CIE Return Address Column
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; V9PIC_NOCFI: .word %r_disp32(DW.ref.__gxx_personality_v0)
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; V9PIC_NOCFI: .byte 12 ! DW_CFA_def_cfa
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; V9PIC_NOCFI-NEXT: .byte 14 ! Reg 14
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; V9PIC_NOCFI: .ascii "\377\017" ! Offset 2047
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; V9PIC_NOCFI: .word %r_disp32(.Ltmp{{.+}}) ! FDE initial location
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define i32 @main(i32 %argc, i8** nocapture readnone %argv) unnamed_addr #0 {
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entry:
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%0 = icmp eq i32 %argc, 2
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%1 = tail call i8* @__cxa_allocate_exception(i32 4) #1
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br i1 %0, label %"3", label %"4"
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"3": ; preds = %entry
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%2 = bitcast i8* %1 to i32*
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store i32 0, i32* %2, align 4
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invoke void @__cxa_throw(i8* %1, i8* bitcast (%struct.__fundamental_type_info_pseudo* @_ZTIi to i8*), void (i8*)* null) #2
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to label %3 unwind label %"8"
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; <label>:3 ; preds = %"3"
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unreachable
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"4": ; preds = %entry
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%4 = bitcast i8* %1 to float*
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store float 1.000000e+00, float* %4, align 4
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invoke void @__cxa_throw(i8* %1, i8* bitcast (%struct.__fundamental_type_info_pseudo* @_ZTIf to i8*), void (i8*)* null) #2
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to label %5 unwind label %"8"
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; <label>:5 ; preds = %"4"
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unreachable
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"5": ; preds = %"13", %"11"
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%6 = phi i32 [ 2, %"13" ], [ 0, %"11" ]
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ret i32 %6
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"8": ; preds = %"4", %"3"
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%exc = landingpad { i8*, i32 } personality i32 (i32, i64, i8*, i8*)* @__gxx_personality_v0
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catch %struct.__fundamental_type_info_pseudo* @_ZTIi
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catch %struct.__fundamental_type_info_pseudo* @_ZTIf
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%exc_ptr12 = extractvalue { i8*, i32 } %exc, 0
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%filter13 = extractvalue { i8*, i32 } %exc, 1
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%typeid = tail call i32 @llvm.eh.typeid.for(i8* bitcast (%struct.__fundamental_type_info_pseudo* @_ZTIi to i8*))
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%7 = icmp eq i32 %filter13, %typeid
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br i1 %7, label %"11", label %8
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; <label>:8 ; preds = %"8"
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%typeid8 = tail call i32 @llvm.eh.typeid.for(i8* bitcast (%struct.__fundamental_type_info_pseudo* @_ZTIf to i8*))
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%9 = icmp eq i32 %filter13, %typeid8
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br i1 %9, label %"13", label %"9"
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"9": ; preds = %8
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resume { i8*, i32 } %exc
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"11": ; preds = %"8"
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%10 = tail call i8* @__cxa_begin_catch(i8* %exc_ptr12) #1
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%11 = tail call i32 @puts(i8* getelementptr inbounds ([12 x i8]* @.cst, i32 0, i32 0))
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tail call void @__cxa_end_catch() #1
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br label %"5"
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"13": ; preds = %8
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%12 = tail call i8* @__cxa_begin_catch(i8* %exc_ptr12) #1
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%13 = tail call i32 @puts(i8* getelementptr inbounds ([14 x i8]* @.cst1, i32 0, i32 0))
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tail call void @__cxa_end_catch() #1
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br label %"5"
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}
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; Function Attrs: nounwind
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declare i8* @__cxa_allocate_exception(i32) #1
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; Function Attrs: noreturn
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declare void @__cxa_throw(i8*, i8*, void (i8*)*) #2
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declare void @__cxa_end_catch()
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; Function Attrs: nounwind readnone
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declare i32 @llvm.eh.typeid.for(i8*) #3
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; Function Attrs: nounwind
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declare i8* @__cxa_begin_catch(i8*) #1
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; Function Attrs: nounwind
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declare i32 @puts(i8* nocapture readonly) #1
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declare i32 @__gxx_personality_v0(i32, i64, i8*, i8*)
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attributes #0 = { "no-frame-pointer-elim-non-leaf"="false" }
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attributes #1 = { nounwind }
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attributes #2 = { noreturn }
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attributes #3 = { nounwind readnone }
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