mirror of
https://github.com/c64scene-ar/llvm-6502.git
synced 2024-12-18 10:31:57 +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
37 lines
827 B
LLVM
37 lines
827 B
LLVM
; RUN: llvm-as < %s | llvm-dis > %t1.ll
|
|
; RUN: llvm-as %t1.ll -o - | llvm-dis > %t2.ll
|
|
; RUN: diff %t1.ll %t2.ll
|
|
|
|
@llvm.used = appending global [1 x i8*] [i8* bitcast (i32* @foo1 to i8*)], section "llvm.metadata"
|
|
|
|
@bar = global i32 0
|
|
@foo1 = alias i32* @bar
|
|
@foo2 = alias i32* @bar
|
|
@foo3 = alias i32* @foo2
|
|
|
|
%FunTy = type i32()
|
|
|
|
define i32 @foo_f() {
|
|
ret i32 0
|
|
}
|
|
@bar_f = alias weak_odr %FunTy* @foo_f
|
|
@bar_ff = alias i32()* @bar_f
|
|
|
|
@bar_i = alias internal i32* @bar
|
|
|
|
@A = alias bitcast (i32* @bar to i64*)
|
|
|
|
define i32 @test() {
|
|
entry:
|
|
%tmp = load i32* @foo1
|
|
%tmp1 = load i32* @foo2
|
|
%tmp0 = load i32* @bar_i
|
|
%tmp2 = call i32 @foo_f()
|
|
%tmp3 = add i32 %tmp, %tmp2
|
|
%tmp4 = call %FunTy* @bar_f()
|
|
%tmp5 = add i32 %tmp3, %tmp4
|
|
%tmp6 = add i32 %tmp1, %tmp5
|
|
%tmp7 = add i32 %tmp6, %tmp0
|
|
ret i32 %tmp7
|
|
}
|