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llvm-project/llvm/test/Assembler/thinlto-multiple-summaries-...

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[llvm-as] Fix assembling of index with multiple summaries sharing single GUID Differential revision: https://reviews.llvm.org/D73091
2020-01-22 17:09:13 +08:00
; Checks that llvm-as/llvm-dis correctly assembles/disassembles index with
; multiple summaries with single GUID.
; RUN: llvm-as %s -o - | llvm-dis -o - | FileCheck %s
source_filename = "index.bc"
^0 = module: (path: "main.bc", hash: (3499594384, 1671013073, 3271036935, 1830411232, 59290952))
; CHECK: ^0 = module: (path: "main.bc", hash: (3499594384, 1671013073, 3271036935, 1830411232, 59290952))
^1 = module: (path: "[Regular LTO]", hash: (0, 0, 0, 0, 0))
; CHECK-NEXT: ^1 = module: (path: "[Regular LTO]", hash: (0, 0, 0, 0, 0))
[ThinLTO] Add Visibility bits to GlobalValueSummary::GVFlags 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
2021-01-28 02:43:51 +08:00
^2 = gv: (guid: 13351721993301222997, summaries: (function: (module: ^0, flags: (linkage: linkonce_odr, visibility: default, notEligibleToImport: 0, live: 1, dsoLocal: 1, canAutoHide: 1), insts: 1), function: (module: ^1, flags: (linkage: available_externally, notEligibleToImport: 1, live: 1, dsoLocal: 1, canAutoHide: 0), insts: 1)))
; CHECK-NEXT: ^2 = gv: (guid: 13351721993301222997, summaries: (function: (module: ^0, flags: (linkage: linkonce_odr, visibility: default, notEligibleToImport: 0, live: 1, dsoLocal: 1, canAutoHide: 1), insts: 1), function: (module: ^1, flags: (linkage: available_externally, visibility: default, notEligibleToImport: 1, live: 1, dsoLocal: 1, canAutoHide: 0), insts: 1)))