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b3b970744d
Imported functions and variable get the visibility from the module supplying the definition. However, non-imported definitions do not get the visibility from (ELF) the most constraining visibility among all modules (Mach-O) the visibility of the prevailing definition. This patch * adds visibility bits to GlobalValueSummary::GVFlags * computes the result visibility and propagates it to all definitions Protected/hidden can imply dso_local which can enable some optimizations (this is stronger than GVFlags::DSOLocal because the implied dso_local can be leveraged for ELF -shared while default visibility dso_local has to be cleared for ELF -shared). Note: we don't have summaries for declarations, so for ELF if a declaration has the most constraining visibility, the result visibility may not be that one. Differential Revision: https://reviews.llvm.org/D92900
93 lines
2.9 KiB
LLVM
93 lines
2.9 KiB
LLVM
; RUN: split-file %s %t
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; RUN: opt -module-summary %t/a.ll -o %ta.bc
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; RUN: opt -module-summary %t/b.ll -o %tb.bc
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;; Test visibility propagation. The prevailing definitions are all from %tb.bc.
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; RUN: llvm-lto2 run -save-temps -enable-import-metadata -o %t1.bc %ta.bc %tb.bc \
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; RUN: -r=%ta.bc,_var1,l -r=%ta.bc,_var2,l \
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; RUN: -r=%ta.bc,_hidden_def_weak_def,l -r=%ta.bc,_not_imported,l -r=%ta.bc,_hidden_def_ref,l \
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; RUN: -r=%ta.bc,_hidden_def_weak_ref,l \
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; RUN: -r=%ta.bc,_ext, -r=%ta.bc,_main,plx \
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; RUN: -r=%tb.bc,_var1,plx -r=%tb.bc,_var2,plx \
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; RUN: -r=%tb.bc,_hidden_def_weak_def,pl -r=%tb.bc,_not_imported,pl -r=%tb.bc,_hidden_def_ref,pl \
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; RUN: -r=%tb.bc,_hidden_def_weak_ref,pl
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; RUN: llvm-dis < %t1.bc.1.3.import.bc | FileCheck %s
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; RUN: llvm-dis < %t1.bc.2.1.promote.bc | FileCheck %s --check-prefix=CHECK2
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;--- a.ll
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target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.15.0"
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; CHECK: @var1 = external hidden global i32, align 4
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; CHECK-NEXT: @var2 = available_externally hidden global i32 1, align 4
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@var1 = weak global i32 1, align 4
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@var2 = extern_weak global i32
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declare void @ext(void ()*)
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; CHECK: declare hidden i32 @hidden_def_weak_def()
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;; Currently the visibility is not propagated onto an unimported function,
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;; because we don't have summaries for declarations.
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; CHECK: declare extern_weak dso_local void @not_imported()
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; CHECK: define available_externally hidden void @hidden_def_ref() !thinlto_src_module !0
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; CHECK: define available_externally hidden void @hidden_def_weak_ref() !thinlto_src_module !0
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; CHECK2: define hidden i32 @hidden_def_weak_def()
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; CHECK2: define hidden void @hidden_def_ref()
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; CHECK2: define hidden void @hidden_def_weak_ref()
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; CHECK2: define hidden void @not_imported()
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define weak i32 @hidden_def_weak_def() {
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entry:
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%0 = load i32, i32* @var2
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ret i32 %0
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}
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declare extern_weak void @not_imported()
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declare void @hidden_def_ref()
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declare extern_weak void @hidden_def_weak_ref()
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define i32 @main() {
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entry:
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call void @ext(void ()* bitcast (i32 ()* @hidden_def_weak_def to void ()*))
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call void @ext(void ()* @hidden_def_ref)
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call void @ext(void ()* @hidden_def_weak_ref)
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call void @ext(void ()* @not_imported)
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;; Calls ensure the functions are imported.
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call i32 @hidden_def_weak_def()
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call void @hidden_def_ref()
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call void @hidden_def_weak_ref()
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ret i32 0
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}
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;--- b.ll
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target datalayout = "e-m:o-p270:32:32-p271:32:32-p272:64:64-i64:64-f80:128-n8:16:32:64-S128"
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target triple = "x86_64-apple-macosx10.15.0"
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@var1 = hidden global i32 1, align 4
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@var2 = hidden global i32 1, align 4
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define hidden i32 @hidden_def_weak_def() {
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entry:
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%0 = load i32, i32* @var1
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ret i32 %0
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}
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define hidden void @hidden_def_ref() {
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entry:
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ret void
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}
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define hidden void @hidden_def_weak_ref() {
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entry:
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ret void
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}
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define hidden void @not_imported() {
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entry:
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ret void
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}
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