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llvm-6502/test/Verifier/alias.ll

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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
; RUN: not llvm-as %s -o /dev/null 2>&1 | FileCheck %s
declare void @f()
@fa = alias void ()* @f
; CHECK: Alias must point to a definition
; CHECK-NEXT: @fa
@g = external global i32
@ga = alias i32* @g
; CHECK: Alias must point to a definition
; CHECK-NEXT: @ga
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
Fix verifier for GlobalAliases to avoid recursing into global initializers. The verifier follows GlobalAlias operands so that it can detect cycles of alias definitions. It was doing this in a way that caused it to also recurse through initializers for the GlobalValue aliasees, and it would fail when an initializer refers to a global that is a declaration and not a definition. This patch causes it to stop recursing when it hits a global definition. <rdar://problem/17277451> git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@210734 91177308-0d34-0410-b5e6-96231b3b80d8
2014-06-12 01:46:54 +00:00
; References to a global declaration from an initializer are OK.
@gptr = global i32* @g
@gptr_a = alias i32** @gptr
; CHECK-NOT: Alias must point to a definition
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
@test2_a = alias i32* @test2_b
@test2_b = alias i32* @test2_a
; CHECK: Aliases cannot form a cycle
; CHECK-NEXT: i32* @test2_a
; CHECK-NEXT: Aliases cannot form a cycle
; CHECK-NEXT: i32* @test2_b
@test3_a = global i32 42
@test3_b = alias weak i32* @test3_a
@test3_c = alias i32* @test3_b
; CHECK: Alias cannot point to a weak alias
; CHECK-NEXT: i32* @test3_c
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