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
68 lines
2.0 KiB
C++
68 lines
2.0 KiB
C++
//===- ARCAsmPrinter.cpp - ARC LLVM assembly writer -------------*- 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 contains a printer that converts from our internal representation
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// of machine-dependent LLVM code to GNU format ARC assembly language.
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//
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//===----------------------------------------------------------------------===//
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#include "ARC.h"
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#include "ARCMCInstLower.h"
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#include "ARCSubtarget.h"
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#include "ARCTargetMachine.h"
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#include "MCTargetDesc/ARCInstPrinter.h"
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#include "TargetInfo/ARCTargetInfo.h"
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#include "llvm/CodeGen/AsmPrinter.h"
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#include "llvm/CodeGen/MachineInstr.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCInst.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Support/TargetRegistry.h"
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#include "llvm/Support/raw_ostream.h"
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using namespace llvm;
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#define DEBUG_TYPE "asm-printer"
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namespace {
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class ARCAsmPrinter : public AsmPrinter {
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ARCMCInstLower MCInstLowering;
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public:
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explicit ARCAsmPrinter(TargetMachine &TM,
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std::unique_ptr<MCStreamer> Streamer)
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: AsmPrinter(TM, std::move(Streamer)),
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MCInstLowering(&OutContext, *this) {}
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StringRef getPassName() const override { return "ARC Assembly Printer"; }
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void EmitInstruction(const MachineInstr *MI) override;
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};
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} // end anonymous namespace
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void ARCAsmPrinter::EmitInstruction(const MachineInstr *MI) {
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SmallString<128> Str;
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raw_svector_ostream O(Str);
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switch (MI->getOpcode()) {
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case ARC::DBG_VALUE:
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llvm_unreachable("Should be handled target independently");
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break;
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}
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MCInst TmpInst;
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MCInstLowering.Lower(MI, TmpInst);
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EmitToStreamer(*OutStreamer, TmpInst);
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}
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// Force static initialization.
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extern "C" LLVM_EXTERNAL_VISIBILITY void LLVMInitializeARCAsmPrinter() {
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RegisterAsmPrinter<ARCAsmPrinter> X(getTheARCTarget());
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}
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