llvm-6502/test/Assembler/2007-09-10-AliasFwdRef.ll

; RUN: llvm-as < %s | llvm-dis
; RUN: verify-uselistorder %s
; PR1645

@__gthread_active_ptr.5335 = internal constant i8* bitcast (i32 (i32)* @__gthrw_pthread_cancel to i8*)    
@__gthrw_pthread_cancel = weak alias i32 (i32)* @pthread_cancel


define weak i32 @pthread_cancel(i32) {
  ret i32 0
}
Fix PR1645 by resolving forward alias references. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41815 91177308-0d34-0410-b5e6-96231b3b80d8 2007-09-10 23:23:53 +00:00			`; RUN: llvm-as < %s \| llvm-dis`
verify-uselistorder: Force -preserve-bc-use-list-order git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@216022 91177308-0d34-0410-b5e6-96231b3b80d8 2014-08-19 21:08:27 +00:00			`; RUN: verify-uselistorder %s`
Fix PR1645 by resolving forward alias references. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41815 91177308-0d34-0410-b5e6-96231b3b80d8 2007-09-10 23:23:53 +00:00			`; PR1645`

			`@__gthread_active_ptr.5335 = internal constant i8* bitcast (i32 (i32)* @__gthrw_pthread_cancel to i8*)`
Use "weak alias" instead of "alias weak" Before this patch we had @a = weak global ... but @b = alias weak ... The patch changes aliases to look more like global variables. Looking at some really old code suggests that the reason was that the old bison based parser had a reduction for alias linkages and another one for global variable linkages. Putting the alias first avoided the reduce/reduce conflict. The days of the old .ll parser are long gone. The new one parses just "linkage" and a later check is responsible for deciding if a linkage is valid in a given context. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@214355 91177308-0d34-0410-b5e6-96231b3b80d8 2014-07-30 22:51:54 +00:00			`@__gthrw_pthread_cancel = weak alias i32 (i32)* @pthread_cancel`
Fix PR1645 by resolving forward alias references. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41815 91177308-0d34-0410-b5e6-96231b3b80d8 2007-09-10 23:23:53 +00:00


Reject alias to undefined symbols in the verifier. On ELF and COFF an alias is just another name for a position in the file. There is no way to refer to a position in another file, so an alias to undefined is meaningless. MachO currently doesn't support aliases. The spec has a N_INDR, which when implemented will have a different set of restrictions. Adding support for it shouldn't be harder than any other IR extension. For now, having the IR represent what is actually possible with current tools makes it easier to fix the design of GlobalAlias. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@203705 91177308-0d34-0410-b5e6-96231b3b80d8 2014-03-12 20:15:49 +00:00			`define weak i32 @pthread_cancel(i32) {`
			`ret i32 0`
			`}`