9ba95f99f3
This restores commit r278330, with fixes for a few bot failures: - Fix a late change I had made to the save temps output file that I missed due to existing files sitting on my disk - Fix a bunch of Windows bot failures with "ambiguous call to overloaded function" due to confusion between llvm::make_unique vs std::make_unique (preface the new make_unique calls with "llvm::") - Attempt to fix a modules bot failure by adding a missing include to LTO/Config.h. Original change: Resolution-based LTO API. Summary: This introduces a resolution-based LTO API. The main advantage of this API over existing APIs is that it allows the linker to supply a resolution for each symbol in each object, rather than the combined object as a whole. This will become increasingly important for use cases such as ThinLTO which require us to process symbol resolutions in a more complicated way than just adjusting linkage. Patch by Peter Collingbourne. Reviewers: rafael, tejohnson, mehdi_amini Subscribers: lhames, tejohnson, mehdi_amini, llvm-commits Differential Revision: https://reviews.llvm.org/D20268 llvm-svn: 278338
93 lines
2.7 KiB
LLVM
93 lines
2.7 KiB
LLVM
; RUN: opt -module-summary %s -o %t.o
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; RUN: opt -module-summary %p/Inputs/thinlto_weak_resolution.ll -o %t2.o
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; Verify that prevailing weak for linker symbol is kept.
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; Note that gold picks the first copy of a function as the prevailing one,
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; so listing %t.o first is sufficient to ensure that its copies are prevailing.
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; RUN: %gold -m elf_x86_64 -plugin %llvmshlibdir/LLVMgold.so \
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; RUN: --plugin-opt=thinlto \
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; RUN: --plugin-opt=save-temps \
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; RUN: -shared \
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; RUN: -o %t3.o %t.o %t2.o
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; RUN: llvm-nm %t3.o | FileCheck %s
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; CHECK: weakfunc
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; Most of the preempted functions should have been eliminated (the plugin will
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; set linkage of odr functions to available_externally and linkonce functions
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; are removed by globaldce). FIXME: Need to introduce combined index linkage
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; that means "drop this function" so we can avoid importing linkonce functions
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; and drop weak functions.
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; RUN: llvm-dis %t2.o.4.opt.bc -o - | FileCheck --check-prefix=OPT2 %s
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; OPT2-NOT: @
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; OPT2: @weakfunc
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; OPT2-NOT: @
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; RUN: llvm-dis %t.o.4.opt.bc -o - | FileCheck --check-prefix=OPT %s
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target triple = "x86_64-unknown-linux-gnu"
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define i32 @main() #0 {
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entry:
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call void @linkonceodralias()
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call void @linkoncealias()
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call void @linkonceodrfuncwithalias()
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call void @linkoncefuncwithalias()
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call void @linkonceodrfunc()
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call void @linkoncefunc()
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call void @weakodrfunc()
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call void @weakfunc()
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call void @linkonceodrfuncInSingleModule()
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ret i32 0
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}
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; Alias are resolved
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; OPT: @linkonceodralias = weak_odr alias void (), void ()* @linkonceodrfuncwithalias
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@linkonceodralias = linkonce_odr alias void (), void ()* @linkonceodrfuncwithalias
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; Alias are resolved
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; OPT: @linkoncealias = weak alias void (), void ()* @linkoncefuncwithalias
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@linkoncealias = linkonce alias void (), void ()* @linkoncefuncwithalias
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; Function with an alias are not optimized
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; OPT: define linkonce_odr void @linkonceodrfuncwithalias()
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define linkonce_odr void @linkonceodrfuncwithalias() #0 {
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entry:
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ret void
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}
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; Function with an alias are not optimized
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; OPT: define linkonce void @linkoncefuncwithalias()
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define linkonce void @linkoncefuncwithalias() #0 {
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entry:
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ret void
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}
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; OPT: define weak_odr void @linkonceodrfunc()
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define linkonce_odr void @linkonceodrfunc() #0 {
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entry:
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ret void
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}
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; OPT: define weak void @linkoncefunc()
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define linkonce void @linkoncefunc() #0 {
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entry:
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ret void
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}
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; OPT: define weak_odr void @weakodrfunc()
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define weak_odr void @weakodrfunc() #0 {
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entry:
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ret void
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}
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; OPT: define weak void @weakfunc()
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define weak void @weakfunc() #0 {
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entry:
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ret void
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}
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; OPT: weak_odr void @linkonceodrfuncInSingleModule()
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define linkonce_odr void @linkonceodrfuncInSingleModule() #0 {
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entry:
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ret void
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}
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