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e204899c29
Summary: Until a more advanced version of importing can be implemented for aliases (one that imports an alias as an available_externally definition of the aliasee), skip the narrow subset of cases that was possible but came at a cost: aliases of linkonce_odr functions could be imported because the linkonce_odr function could be safely duplicated from the source module. This came/comes at the cost of not being able to 'home' imported linkonce functions (they had to be emitted linkonce_odr in all the destination modules (even if they weren't used by an alias) rather than as available_externally - causing extra object size). Tangentially, this also was the only reason ThinLTO would emit multiple CUs in to the resulting DWARF - which happens to be a problem for Fission (there's a fix for this in GDB but not released yet, etc). (actually it's not the only reason - but I'm sending a patch to fix the other reason shortly) There's no reason to believe this particularly narrow alias importing was especially/meaningfully important, only that it was /possible/ to implement in this way. When a more general solution is done, it should still satisfy the DWARF concerns above, since the import will still be available_externally, and thus not create extra CUs. Since now all aliases are treated the same, I removed/simplified some test cases since they were testing corner cases where there are no longer any corners. Reviewers: tejohnson, mehdi_amini Differential Revision: https://reviews.llvm.org/D35875 llvm-svn: 309278
166 lines
8.5 KiB
LLVM
166 lines
8.5 KiB
LLVM
; RUN: opt -module-summary %s -o %t1.bc
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; RUN: opt -module-summary %p/Inputs/alias_import.ll -o %t2.bc
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; RUN: llvm-lto -thinlto-action=thinlink -o %t.index.bc %t1.bc %t2.bc
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; RUN: llvm-lto -thinlto-action=promote -thinlto-index %t.index.bc %t2.bc -o - | llvm-dis -o - | FileCheck %s --check-prefix=PROMOTE
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; RUN: llvm-lto -thinlto-action=import -thinlto-index %t.index.bc %t1.bc -o - | llvm-dis -o - | FileCheck %s --check-prefix=IMPORT
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; Alias can't point to "available_externally", so they cannot be imported for
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; now. This could be implemented by importing the alias as an
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; available_externally definition copied from the aliasee's body.
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; PROMOTE-DAG: @globalfuncAlias = alias void (...), bitcast (void ()* @globalfunc to void (...)*)
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; PROMOTE-DAG: @globalfuncWeakAlias = weak alias void (...), bitcast (void ()* @globalfunc to void (...)*)
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; PROMOTE-DAG: @globalfuncLinkonceAlias = weak alias void (...), bitcast (void ()* @globalfunc to void (...)*)
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; PROMOTE-DAG: @globalfuncWeakODRAlias = weak_odr alias void (...), bitcast (void ()* @globalfunc to void (...)*)
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; PROMOTE-DAG: @globalfuncLinkonceODRAlias = weak_odr alias void (...), bitcast (void ()* @globalfunc to void (...)*)
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; PROMOTE-DAG: @internalfuncAlias = alias void (...), bitcast (void ()* @internalfunc to void (...)*)
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; PROMOTE-DAG: @internalfuncWeakAlias = weak alias void (...), bitcast (void ()* @internalfunc to void (...)*)
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; PROMOTE-DAG: @internalfuncLinkonceAlias = weak alias void (...), bitcast (void ()* @internalfunc to void (...)*)
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; PROMOTE-DAG: @internalfuncWeakODRAlias = weak_odr alias void (...), bitcast (void ()* @internalfunc to void (...)*)
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; PROMOTE-DAG: @internalfuncLinkonceODRAlias = weak_odr alias void (...), bitcast (void ()* @internalfunc to void (...)*)
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; PROMOTE-DAG: @linkoncefuncAlias = alias void (...), bitcast (void ()* @linkoncefunc to void (...)*)
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; PROMOTE-DAG: @linkoncefuncWeakAlias = weak alias void (...), bitcast (void ()* @linkoncefunc to void (...)*)
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; PROMOTE-DAG: @linkoncefuncLinkonceAlias = weak alias void (...), bitcast (void ()* @linkoncefunc to void (...)*)
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; PROMOTE-DAG: @linkoncefuncWeakODRAlias = weak_odr alias void (...), bitcast (void ()* @linkoncefunc to void (...)*)
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; PROMOTE-DAG: @linkoncefuncLinkonceODRAlias = weak_odr alias void (...), bitcast (void ()* @linkoncefunc to void (...)*)
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; PROMOTE-DAG: @weakfuncAlias = alias void (...), bitcast (void ()* @weakfunc to void (...)*)
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; PROMOTE-DAG: @weakfuncWeakAlias = weak alias void (...), bitcast (void ()* @weakfunc to void (...)*)
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; PROMOTE-DAG: @weakfuncLinkonceAlias = weak alias void (...), bitcast (void ()* @weakfunc to void (...)*)
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; PROMOTE-DAG: @weakfuncWeakODRAlias = weak_odr alias void (...), bitcast (void ()* @weakfunc to void (...)*)
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; PROMOTE-DAG: @weakfuncLinkonceODRAlias = weak_odr alias void (...), bitcast (void ()* @weakfunc to void (...)*)
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; PROMOTE-DAG: @weakODRfuncAlias = alias void (...), bitcast (void ()* @weakODRfunc to void (...)*)
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; PROMOTE-DAG: @weakODRfuncWeakAlias = weak alias void (...), bitcast (void ()* @weakODRfunc to void (...)*)
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; PROMOTE-DAG: @weakODRfuncLinkonceAlias = weak alias void (...), bitcast (void ()* @weakODRfunc to void (...)*)
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; PROMOTE-DAG: @weakODRfuncWeakODRAlias = weak_odr alias void (...), bitcast (void ()* @weakODRfunc to void (...)*)
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; PROMOTE-DAG: @weakODRfuncLinkonceODRAlias = weak_odr alias void (...), bitcast (void ()* @weakODRfunc to void (...)*)
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; PROMOTE-DAG: @linkonceODRfuncAlias = alias void (...), bitcast (void ()* @linkonceODRfunc to void (...)*)
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; PROMOTE-DAG: @linkonceODRfuncWeakAlias = weak alias void (...), bitcast (void ()* @linkonceODRfunc to void (...)*)
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; PROMOTE-DAG: @linkonceODRfuncWeakODRAlias = weak_odr alias void (...), bitcast (void ()* @linkonceODRfunc to void (...)*)
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; PROMOTE-DAG: @linkonceODRfuncLinkonceAlias = weak alias void (...), bitcast (void ()* @linkonceODRfunc to void (...)*)
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; PROMOTE-DAG: @linkonceODRfuncLinkonceODRAlias = weak_odr alias void (...), bitcast (void ()* @linkonceODRfunc to void (...)*)
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; PROMOTE-DAG: define void @globalfunc()
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; PROMOTE-DAG: define internal void @internalfunc()
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; PROMOTE-DAG: define weak_odr void @linkonceODRfunc()
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; PROMOTE-DAG: define weak_odr void @weakODRfunc()
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; PROMOTE-DAG: define weak void @linkoncefunc()
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; PROMOTE-DAG: define weak void @weakfunc()
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; On the import side now, verify that aliases are not imported
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; IMPORT-DAG: declare void @linkonceODRfuncWeakAlias
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; IMPORT-DAG: declare void @linkonceODRfuncLinkonceAlias
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; IMPORT-DAG: declare void @linkonceODRfuncAlias
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; IMPORT-DAG: declare void @linkonceODRfuncWeakODRAlias
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; IMPORT-DAG: declare void @linkonceODRfuncLinkonceODRAlias
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; On the import side, these aliases are not imported (they don't point to a linkonce_odr)
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; IMPORT-DAG: declare void @globalfuncAlias()
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; IMPORT-DAG: declare void @globalfuncWeakAlias()
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; IMPORT-DAG: declare void @globalfuncLinkonceAlias()
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; IMPORT-DAG: declare void @globalfuncWeakODRAlias()
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; IMPORT-DAG: declare void @globalfuncLinkonceODRAlias()
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; IMPORT-DAG: declare void @internalfuncAlias()
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; IMPORT-DAG: declare void @internalfuncWeakAlias()
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; IMPORT-DAG: declare void @internalfuncLinkonceAlias()
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; IMPORT-DAG: declare void @internalfuncWeakODRAlias()
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; IMPORT-DAG: declare void @internalfuncLinkonceODRAlias()
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; IMPORT-DAG: declare void @weakODRfuncAlias()
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; IMPORT-DAG: declare void @weakODRfuncWeakAlias()
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; IMPORT-DAG: declare void @weakODRfuncLinkonceAlias()
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; IMPORT-DAG: declare void @weakODRfuncWeakODRAlias()
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; IMPORT-DAG: declare void @weakODRfuncLinkonceODRAlias()
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; IMPORT-DAG: declare void @linkoncefuncAlias()
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; IMPORT-DAG: declare void @linkoncefuncWeakAlias()
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; IMPORT-DAG: declare void @linkoncefuncLinkonceAlias()
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; IMPORT-DAG: declare void @linkoncefuncWeakODRAlias()
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; IMPORT-DAG: declare void @linkoncefuncLinkonceODRAlias()
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; IMPORT-DAG: declare void @weakfuncAlias()
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; IMPORT-DAG: declare void @weakfuncWeakAlias()
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; IMPORT-DAG: declare void @weakfuncLinkonceAlias()
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; IMPORT-DAG: declare void @weakfuncWeakODRAlias()
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; IMPORT-DAG: declare void @weakfuncLinkonceODRAlias()
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; IMPORT-DAG: declare void @linkonceODRfuncAlias()
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; IMPORT-DAG: declare void @linkonceODRfuncWeakAlias()
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; IMPORT-DAG: declare void @linkonceODRfuncWeakODRAlias()
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; IMPORT-DAG: declare void @linkonceODRfuncLinkonceAlias()
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; IMPORT-DAG: declare void @linkonceODRfuncLinkonceODRAlias()
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define i32 @main() #0 {
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entry:
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call void @globalfuncAlias()
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call void @globalfuncWeakAlias()
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call void @globalfuncLinkonceAlias()
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call void @globalfuncWeakODRAlias()
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call void @globalfuncLinkonceODRAlias()
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call void @internalfuncAlias()
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call void @internalfuncWeakAlias()
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call void @internalfuncLinkonceAlias()
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call void @internalfuncWeakODRAlias()
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call void @internalfuncLinkonceODRAlias()
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call void @linkonceODRfuncAlias()
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call void @linkonceODRfuncWeakAlias()
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call void @linkonceODRfuncLinkonceAlias()
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call void @linkonceODRfuncWeakODRAlias()
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call void @linkonceODRfuncLinkonceODRAlias()
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call void @weakODRfuncAlias()
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call void @weakODRfuncWeakAlias()
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call void @weakODRfuncLinkonceAlias()
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call void @weakODRfuncWeakODRAlias()
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call void @weakODRfuncLinkonceODRAlias()
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call void @linkoncefuncAlias()
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call void @linkoncefuncWeakAlias()
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call void @linkoncefuncLinkonceAlias()
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call void @linkoncefuncWeakODRAlias()
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call void @linkoncefuncLinkonceODRAlias()
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call void @weakfuncAlias()
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call void @weakfuncWeakAlias()
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call void @weakfuncLinkonceAlias()
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call void @weakfuncWeakODRAlias()
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call void @weakfuncLinkonceODRAlias()
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ret i32 0
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}
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declare void @globalfuncAlias()
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declare void @globalfuncWeakAlias()
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declare void @globalfuncLinkonceAlias()
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declare void @globalfuncWeakODRAlias()
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declare void @globalfuncLinkonceODRAlias()
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declare void @internalfuncAlias()
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declare void @internalfuncWeakAlias()
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declare void @internalfuncLinkonceAlias()
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declare void @internalfuncWeakODRAlias()
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declare void @internalfuncLinkonceODRAlias()
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declare void @linkonceODRfuncAlias()
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declare void @linkonceODRfuncWeakAlias()
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declare void @linkonceODRfuncLinkonceAlias()
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declare void @linkonceODRfuncWeakODRAlias()
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declare void @linkonceODRfuncLinkonceODRAlias()
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declare void @weakODRfuncAlias()
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declare void @weakODRfuncWeakAlias()
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declare void @weakODRfuncLinkonceAlias()
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declare void @weakODRfuncWeakODRAlias()
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declare void @weakODRfuncLinkonceODRAlias()
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declare void @linkoncefuncAlias()
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declare void @linkoncefuncWeakAlias()
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declare void @linkoncefuncLinkonceAlias()
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declare void @linkoncefuncWeakODRAlias()
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declare void @linkoncefuncLinkonceODRAlias()
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declare void @weakfuncAlias()
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declare void @weakfuncWeakAlias()
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declare void @weakfuncLinkonceAlias()
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declare void @weakfuncWeakODRAlias()
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declare void @weakfuncLinkonceODRAlias()
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