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c944447e56
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. llvm-svn: 255254
38 lines
1.4 KiB
LLVM
38 lines
1.4 KiB
LLVM
; RUN: llvm-link %s %S/Inputs/alias.ll -S -o - | FileCheck --check-prefix=C1 %s
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; RUN: llvm-link %S/Inputs/alias.ll %s -S -o - | FileCheck --check-prefix=C2 %s
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; FIXME:
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; The C1 direction is incorrect.
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; When moving an alias to an existing module and we want to discard the aliasee
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; (the C2 case), the IRMover knows to copy the aliasee as internal.
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; When moving a replacement to an aliasee to a module that has an alias (C1),
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; a replace all uses with blindly changes the alias.
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; The C1 case doesn't happen when using a system linker with a plugin because
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; the linker does full symbol resolution first.
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; Given that this is a problem only with llvm-link and its 1 module at a time
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; linking, it should probably learn to changes the aliases in the destination
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; before using the IRMover.
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@foo = weak global i32 0
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; C1-DAG: @foo = alias i32, i32* @zed
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; C2-DAG: @foo = alias i32, i32* @zed
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@bar = alias i32, i32* @foo
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; C1-DAG: @bar = alias i32, i32* @foo
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; C2-DAG: @foo.1 = internal global i32 0
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; C2-DAG: @bar = alias i32, i32* @foo.1
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@foo2 = weak global i32 0
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; C1-DAG: @foo2 = alias i16, bitcast (i32* @zed to i16*)
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; C2-DAG: @foo2 = alias i16, bitcast (i32* @zed to i16*)
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@bar2 = alias i32, i32* @foo2
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; C1-DAG: @bar2 = alias i32, bitcast (i16* @foo2 to i32*)
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; C2-DAG: @foo2.2 = internal global i32 0
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; C2-DAG: @bar2 = alias i32, i32* @foo2.2
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; C1-DAG: @zed = global i32 42
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; C2-DAG: @zed = global i32 42
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