0dbcb36394
Summary: For builds with LLVM_BUILD_LLVM_DYLIB=ON and BUILD_SHARED_LIBS=OFF this change makes all symbols in the target specific libraries hidden by default. A new macro called LLVM_EXTERNAL_VISIBILITY has been added to mark symbols in these libraries public, which is mainly needed for the definitions of the LLVMInitialize* functions. This patch reduces the number of public symbols in libLLVM.so by about 25%. This should improve load times for the dynamic library and also make abi checker tools, like abidiff require less memory when analyzing libLLVM.so One side-effect of this change is that for builds with LLVM_BUILD_LLVM_DYLIB=ON and LLVM_LINK_LLVM_DYLIB=ON some unittests that access symbols that are no longer public will need to be statically linked. Before and after public symbol counts (using gcc 8.2.1, ld.bfd 2.31.1): nm before/libLLVM-9svn.so | grep ' [A-Zuvw] ' | wc -l 36221 nm after/libLLVM-9svn.so | grep ' [A-Zuvw] ' | wc -l 26278 Reviewers: chandlerc, beanz, mgorny, rnk, hans Reviewed By: rnk, hans Subscribers: merge_guards_bot, luismarques, smeenai, ldionne, lenary, s.egerton, pzheng, sameer.abuasal, MaskRay, wuzish, echristo, Jim, hiraditya, michaelplatings, chapuni, jholewinski, arsenm, dschuff, jyknight, dylanmckay, sdardis, nemanjai, jvesely, javed.absar, sbc100, jgravelle-google, aheejin, kbarton, fedor.sergeev, asb, rbar, johnrusso, simoncook, apazos, sabuasal, niosHD, jrtc27, zzheng, edward-jones, mgrang, atanasyan, rogfer01, MartinMosbeck, brucehoult, the_o, PkmX, jocewei, kristina, jsji, llvm-commits Tags: #llvm Differential Revision: https://reviews.llvm.org/D54439
35 lines
1.3 KiB
C++
35 lines
1.3 KiB
C++
//===-- WebAssemblyTargetInfo.cpp - WebAssembly Target Implementation -----===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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///
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/// \file
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/// This file registers the WebAssembly target.
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///
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//===----------------------------------------------------------------------===//
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#include "TargetInfo/WebAssemblyTargetInfo.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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#define DEBUG_TYPE "wasm-target-info"
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Target &llvm::getTheWebAssemblyTarget32() {
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static Target TheWebAssemblyTarget32;
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return TheWebAssemblyTarget32;
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}
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Target &llvm::getTheWebAssemblyTarget64() {
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static Target TheWebAssemblyTarget64;
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return TheWebAssemblyTarget64;
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}
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extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeWebAssemblyTargetInfo() {
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RegisterTarget<Triple::wasm32> X(getTheWebAssemblyTarget32(), "wasm32",
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"WebAssembly 32-bit", "WebAssembly");
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RegisterTarget<Triple::wasm64> Y(getTheWebAssemblyTarget64(), "wasm64",
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"WebAssembly 64-bit", "WebAssembly");
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}
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