llvm-6502/test/Transforms/GlobalOpt/2009-02-15-BitcastAlias.ll

; RUN: opt < %s -globalopt

@g = global i32 0

@a = alias bitcast (i32* @g to i8*)

define void @f() {
	%tmp = load i8* @a
	ret void
}
Change tests from "opt %s" to "opt < %s" so that opt doesn't see the input filename so that opt doesn't print the input filename in the output so that grep lines in the tests don't unintentionally match strings in the input filename. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@81537 91177308-0d34-0410-b5e6-96231b3b80d8 2009-09-11 18:01:28 +00:00			`; RUN: opt < %s -globalopt`
If the target of an alias has internal linkage, then the alias can be morphed into the target. Implement this transform, and fix a crash in the existing transform at the same time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64583 91177308-0d34-0410-b5e6-96231b3b80d8 2009-02-15 09:56:08 +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			`@g = global i32 0`
If the target of an alias has internal linkage, then the alias can be morphed into the target. Implement this transform, and fix a crash in the existing transform at the same time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64583 91177308-0d34-0410-b5e6-96231b3b80d8 2009-02-15 09:56:08 +00:00
Allow alias to point to an arbitrary ConstantExpr. This patch changes GlobalAlias to point to an arbitrary ConstantExpr and it is up to MC (or the system assembler) to decide if that expression is valid or not. This reduces our ability to diagnose invalid uses and how early we can spot them, but it also lets us do things like @test5 = alias inttoptr(i32 sub (i32 ptrtoint (i32* @test2 to i32), i32 ptrtoint (i32* @bar to i32)) to i32) An important implication of this patch is that the notion of aliased global doesn't exist any more. The alias has to encode the information needed to access it in its metadata (linkage, visibility, type, etc). Another consequence to notice is that getSection has to return a "const char ". It could return a NullTerminatedStringRef if there was such a thing, but when that was proposed the decision was to just uses "const char*" for that. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210062 91177308-0d34-0410-b5e6-96231b3b80d8 2014-06-03 02:41:57 +00:00			`@a = alias bitcast (i32* @g to i8*)`
If the target of an alias has internal linkage, then the alias can be morphed into the target. Implement this transform, and fix a crash in the existing transform at the same time. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@64583 91177308-0d34-0410-b5e6-96231b3b80d8 2009-02-15 09:56:08 +00:00
			`define void @f() {`
			`%tmp = load i8* @a`
			`ret void`
			`}`