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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
43 lines
783 B
LLVM
43 lines
783 B
LLVM
; RUN: opt < %s -globalopt -S | FileCheck %s
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@foo1 = alias void ()* @foo2
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; CHECK: @foo1 = alias void ()* @bar2
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@foo2 = alias void()* @bar1
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; CHECK: @foo2 = alias void ()* @bar2
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@bar1 = alias void ()* @bar2
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; CHECK: @bar1 = alias void ()* @bar2
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@weak1 = alias weak void ()* @bar2
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; CHECK: @weak1 = alias weak void ()* @bar2
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define void @bar2() {
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ret void
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}
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; CHECK: define void @bar2()
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define void @baz() {
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entry:
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call void @foo1()
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; CHECK: call void @bar2()
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call void @foo2()
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; CHECK: call void @bar2()
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call void @bar1()
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; CHECK: call void @bar2()
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call void @weak1()
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; CHECK: call void @weak1()
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ret void
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}
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@foo3 = alias void ()* @bar3
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; CHECK-NOT: bar3
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define internal void @bar3() {
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ret void
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}
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;CHECK: define void @foo3
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