llvm/test/Linker/alias.ll
Rafael Espindola da5132018f Slit lib/Linker in two.
A linker normally has two stages: symbol resolution and "moving stuff".

In lib/Linker there is the complication of lazy linking some globals,
but it was still far more mixed than it needed to.

This splits the linker into a lower level IRMover and the linker proper.
The IRMover just takes a list of globals to move and a callback that
lets the user control what is lazy linked.

The main motivation is that now tools/gold (and soon lld) can use their
own symbol resolution to instruct IRMover what to do.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@255254 91177308-0d34-0410-b5e6-96231b3b80d8
2015-12-10 14:19:35 +00:00

38 lines
1.4 KiB
LLVM

; RUN: llvm-link %s %S/Inputs/alias.ll -S -o - | FileCheck --check-prefix=C1 %s
; RUN: llvm-link %S/Inputs/alias.ll %s -S -o - | FileCheck --check-prefix=C2 %s
; FIXME:
; The C1 direction is incorrect.
; When moving an alias to an existing module and we want to discard the aliasee
; (the C2 case), the IRMover knows to copy the aliasee as internal.
; When moving a replacement to an aliasee to a module that has an alias (C1),
; a replace all uses with blindly changes the alias.
; The C1 case doesn't happen when using a system linker with a plugin because
; the linker does full symbol resolution first.
; Given that this is a problem only with llvm-link and its 1 module at a time
; linking, it should probably learn to changes the aliases in the destination
; before using the IRMover.
@foo = weak global i32 0
; C1-DAG: @foo = alias i32, i32* @zed
; C2-DAG: @foo = alias i32, i32* @zed
@bar = alias i32, i32* @foo
; C1-DAG: @bar = alias i32, i32* @foo
; C2-DAG: @foo.1 = internal global i32 0
; C2-DAG: @bar = alias i32, i32* @foo.1
@foo2 = weak global i32 0
; C1-DAG: @foo2 = alias i16, bitcast (i32* @zed to i16*)
; C2-DAG: @foo2 = alias i16, bitcast (i32* @zed to i16*)
@bar2 = alias i32, i32* @foo2
; C1-DAG: @bar2 = alias i32, bitcast (i16* @foo2 to i32*)
; C2-DAG: @foo2.2 = internal global i32 0
; C2-DAG: @bar2 = alias i32, i32* @foo2.2
; C1-DAG: @zed = global i32 42
; C2-DAG: @zed = global i32 42