mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2025-01-15 07:34:33 +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
105 lines
2.3 KiB
LLVM
105 lines
2.3 KiB
LLVM
; RUN: llc -mtriple x86_64-pc-win32 < %s | FileCheck -check-prefix=CHECK -check-prefix=WIN32 %s
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; RUN: llc -mtriple x86_64-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: .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: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: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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