mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-15 04:30:12 +00:00
f165cf7ce8
This adds back r204781.
Original message:
Aliases are just another name for a position in a file. As such, the
regular symbol resolutions are not applied. For example, given
define void @my_func() {
ret void
}
@my_alias = alias weak void ()* @my_func
@my_alias2 = alias void ()* @my_alias
We produce without this patch:
.weak my_alias
my_alias = my_func
.globl my_alias2
my_alias2 = my_alias
That is, in the resulting ELF file my_alias, my_func and my_alias are
just 3 names pointing to offset 0 of .text. That is *not* the
semantics of IR linking. For example, linking in a
@my_alias = alias void ()* @other_func
would require the strong my_alias to override the weak one and
my_alias2 would end up pointing to other_func.
There is no way to represent that with aliases being just another
name, so the best solution seems to be to just disallow it, converting
a miscompile into an error.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@204934 91177308-0d34-0410-b5e6-96231b3b80d8
126 lines
2.8 KiB
LLVM
126 lines
2.8 KiB
LLVM
; RUN: llc -mtriple i386-pc-win32 < %s | FileCheck -check-prefix=CHECK -check-prefix=WIN32 %s
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; RUN: llc -mtriple i386-pc-mingw32 < %s | FileCheck -check-prefix=CHECK -check-prefix=MINGW %s
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; CHECK: .text
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define void @notExported() {
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ret void
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}
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; CHECK: .globl _f1
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define dllexport void @f1() {
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ret void
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}
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; CHECK: .globl _f2
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define dllexport void @f2() unnamed_addr {
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ret void
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}
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; CHECK: .globl _stdfun@0
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define dllexport x86_stdcallcc void @stdfun() nounwind {
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ret void
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}
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; CHECK: .globl @fastfun@0
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define dllexport x86_fastcallcc i32 @fastfun() nounwind {
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ret i32 0
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}
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; CHECK: .globl _thisfun
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define dllexport x86_thiscallcc void @thisfun() nounwind {
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ret void
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}
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; CHECK: .section .text,"xr",discard,_lnk1
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; CHECK: .globl _lnk1
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define linkonce_odr dllexport void @lnk1() {
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ret void
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}
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; CHECK: .section .text,"xr",discard,_lnk2
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; CHECK: .globl _lnk2
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define linkonce_odr dllexport void @lnk2() alwaysinline {
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ret void
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}
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; CHECK: .section .text,"xr",discard,_weak1
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; CHECK: .globl _weak1
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define weak_odr dllexport void @weak1() {
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ret void
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}
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; CHECK: .data
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; CHECK: .globl _Var1
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@Var1 = dllexport global i32 1, align 4
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; CHECK: .rdata,"r"
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; CHECK: .globl _Var2
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@Var2 = dllexport unnamed_addr constant i32 1
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; CHECK: .comm _Var3
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@Var3 = common dllexport global i32 0, align 4
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; CHECK: .section .data,"w",discard,_WeakVar1
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; CHECK: .globl _WeakVar1
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@WeakVar1 = weak_odr dllexport global i32 1, align 4
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; CHECK: .section .rdata,"r",discard,_WeakVar2
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; CHECK: .globl _WeakVar2
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@WeakVar2 = weak_odr dllexport unnamed_addr constant i32 1
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; CHECK: .globl _alias
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; CHECK: _alias = _notExported
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@alias = dllexport alias void()* @notExported
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; CHECK: .globl _alias2
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; CHECK: _alias2 = _f1
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@alias2 = dllexport alias void()* @f1
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; CHECK: .globl _alias3
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; CHECK: _alias3 = _notExported
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@alias3 = dllexport alias void()* @alias
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; CHECK: .weak _weak_alias
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; CHECK: _weak_alias = _f1
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@weak_alias = dllexport alias weak_odr void()* @f1
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; CHECK: .section .drectve
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; WIN32: /EXPORT:_Var1,DATA
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; WIN32: /EXPORT:_Var2,DATA
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; WIN32: /EXPORT:_Var3,DATA
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; WIN32: /EXPORT:_WeakVar1,DATA
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; WIN32: /EXPORT:_WeakVar2,DATA
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; WIN32: /EXPORT:_f1
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; WIN32: /EXPORT:_f2
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; WIN32: /EXPORT:_stdfun@0
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; WIN32: /EXPORT:@fastfun@0
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; WIN32: /EXPORT:_thisfun
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; WIN32: /EXPORT:_lnk1
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; WIN32: /EXPORT:_lnk2
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; WIN32: /EXPORT:_weak1
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; WIN32: /EXPORT:_alias
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; WIN32: /EXPORT:_alias2
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; WIN32: /EXPORT:_alias3
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; WIN32: /EXPORT:_weak_alias
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; MINGW: -export:_Var1,data
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; MINGW: -export:_Var2,data
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; MINGW: -export:_Var3,data
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; MINGW: -export:_WeakVar1,data
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; MINGW: -export:_WeakVar2,data
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; MINGW: -export:_f1
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; MINGW: -export:_f2
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; MINGW: -export:_stdfun@0
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; MINGW: -export:@fastfun@0
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; MINGW: -export:_thisfun
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; MINGW: -export:_lnk1
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; MINGW: -export:_lnk2
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; MINGW: -export:_weak1
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; MINGW: -export:_alias
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; MINGW: -export:_alias2
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; MINGW: -export:_alias3
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; MINGW: -export:_weak_alias
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