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
106 lines
3.7 KiB
C++
106 lines
3.7 KiB
C++
//===- ARCMCTargetDesc.cpp - ARC Target Descriptions ------------*- C++ -*-===//
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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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// This file provides ARC specific target descriptions.
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//
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//===----------------------------------------------------------------------===//
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#include "ARCMCTargetDesc.h"
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#include "ARCInstPrinter.h"
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#include "ARCMCAsmInfo.h"
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#include "ARCTargetStreamer.h"
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#include "TargetInfo/ARCTargetInfo.h"
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#include "llvm/MC/MCDwarf.h"
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#include "llvm/MC/MCInstrInfo.h"
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#include "llvm/MC/MCRegisterInfo.h"
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#include "llvm/MC/MCSubtargetInfo.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/FormattedStream.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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#define GET_INSTRINFO_MC_DESC
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#include "ARCGenInstrInfo.inc"
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#define GET_SUBTARGETINFO_MC_DESC
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#include "ARCGenSubtargetInfo.inc"
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#define GET_REGINFO_MC_DESC
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#include "ARCGenRegisterInfo.inc"
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static MCInstrInfo *createARCMCInstrInfo() {
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auto *X = new MCInstrInfo();
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InitARCMCInstrInfo(X);
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return X;
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}
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static MCRegisterInfo *createARCMCRegisterInfo(const Triple &TT) {
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auto *X = new MCRegisterInfo();
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InitARCMCRegisterInfo(X, ARC::BLINK);
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return X;
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}
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static MCSubtargetInfo *createARCMCSubtargetInfo(const Triple &TT,
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StringRef CPU, StringRef FS) {
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return createARCMCSubtargetInfoImpl(TT, CPU, FS);
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}
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static MCAsmInfo *createARCMCAsmInfo(const MCRegisterInfo &MRI,
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const Triple &TT,
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const MCTargetOptions &Options) {
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MCAsmInfo *MAI = new ARCMCAsmInfo(TT);
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// Initial state of the frame pointer is SP.
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MCCFIInstruction Inst = MCCFIInstruction::createDefCfa(nullptr, ARC::SP, 0);
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MAI->addInitialFrameState(Inst);
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return MAI;
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}
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static MCInstPrinter *createARCMCInstPrinter(const Triple &T,
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unsigned SyntaxVariant,
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const MCAsmInfo &MAI,
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const MCInstrInfo &MII,
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const MCRegisterInfo &MRI) {
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return new ARCInstPrinter(MAI, MII, MRI);
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}
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ARCTargetStreamer::ARCTargetStreamer(MCStreamer &S) : MCTargetStreamer(S) {}
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ARCTargetStreamer::~ARCTargetStreamer() = default;
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static MCTargetStreamer *createTargetAsmStreamer(MCStreamer &S,
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formatted_raw_ostream &OS,
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MCInstPrinter *InstPrint,
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bool isVerboseAsm) {
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return new ARCTargetStreamer(S);
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}
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// Force static initialization.
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extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARCTargetMC() {
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// Register the MC asm info.
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Target &TheARCTarget = getTheARCTarget();
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RegisterMCAsmInfoFn X(TheARCTarget, createARCMCAsmInfo);
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// Register the MC instruction info.
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TargetRegistry::RegisterMCInstrInfo(TheARCTarget, createARCMCInstrInfo);
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// Register the MC register info.
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TargetRegistry::RegisterMCRegInfo(TheARCTarget, createARCMCRegisterInfo);
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// Register the MC subtarget info.
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TargetRegistry::RegisterMCSubtargetInfo(TheARCTarget,
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createARCMCSubtargetInfo);
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// Register the MCInstPrinter
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TargetRegistry::RegisterMCInstPrinter(TheARCTarget, createARCMCInstPrinter);
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TargetRegistry::RegisterAsmTargetStreamer(TheARCTarget,
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createTargetAsmStreamer);
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}
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