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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
14 lines
1.3 KiB
LLVM
14 lines
1.3 KiB
LLVM
;; Test visibility parsing in GlobalValueSummary::GVFlags.
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; RUN: llvm-as %s -o - | llvm-dis -o - | FileCheck %s
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^0 = module: (path: "thinlto-summary-visibility1.o", hash: (1369602428, 2747878711, 259090915, 2507395659, 1141468049))
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^1 = module: (path: "thinlto-summary-visibility2.o", hash: (2998369023, 4283347029, 1195487472, 2757298015, 1852134156))
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; CHECK: ^2 = gv: (guid: 2, summaries: (function: (module: ^0, flags: (linkage: external, visibility: default, notEligibleToImport: 0, live: 0, dsoLocal: 0, canAutoHide: 0), insts: 10)))
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; CHECK-NEXT: ^3 = gv: (guid: 3, summaries: (function: (module: ^0, flags: (linkage: external, visibility: protected, notEligibleToImport: 0, live: 0, dsoLocal: 0, canAutoHide: 0), insts: 10)))
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; CHECK-NEXT: ^4 = gv: (guid: 4, summaries: (function: (module: ^0, flags: (linkage: external, visibility: hidden, notEligibleToImport: 0, live: 0, dsoLocal: 0, canAutoHide: 0), insts: 10)))
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^2 = gv: (guid: 2, summaries: (function: (module: ^0, flags: (linkage: external, visibility: default), insts: 10)))
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^3 = gv: (guid: 3, summaries: (function: (module: ^0, flags: (linkage: external, visibility: protected), insts: 10)))
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^4 = gv: (guid: 4, summaries: (function: (module: ^0, flags: (linkage: external, visibility: hidden, notEligibleToImport: 0), insts: 10)))
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