2017-06-22 04:58:17 +08:00
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//===- llvm/MC/MCWinCOFFStreamer.cpp --------------------------------------===//
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2010-07-12 06:05:00 +08:00
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//
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2019-01-19 16:50:56 +08:00
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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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2010-07-12 06:05:00 +08:00
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//
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//===----------------------------------------------------------------------===//
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//
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2014-04-27 11:48:05 +08:00
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// This file contains an implementation of a Windows COFF object file streamer.
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2010-07-12 06:05:00 +08:00
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//
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//===----------------------------------------------------------------------===//
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2017-02-08 07:02:00 +08:00
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#include "llvm/ADT/SmallString.h"
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#include "llvm/ADT/SmallVector.h"
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#include "llvm/ADT/Triple.h"
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#include "llvm/ADT/Twine.h"
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2017-06-07 11:48:56 +08:00
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#include "llvm/BinaryFormat/COFF.h"
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2012-12-04 00:50:05 +08:00
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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/MC/MCAssembler.h"
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#include "llvm/MC/MCCodeEmitter.h"
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2010-07-12 06:05:00 +08:00
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#include "llvm/MC/MCContext.h"
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2012-12-04 00:50:05 +08:00
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#include "llvm/MC/MCExpr.h"
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2017-02-08 07:02:00 +08:00
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#include "llvm/MC/MCFixup.h"
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#include "llvm/MC/MCFragment.h"
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2014-01-24 06:49:25 +08:00
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#include "llvm/MC/MCObjectFileInfo.h"
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2012-12-04 00:50:05 +08:00
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#include "llvm/MC/MCObjectStreamer.h"
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2018-05-19 02:26:45 +08:00
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#include "llvm/MC/MCObjectWriter.h"
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2010-07-12 06:05:00 +08:00
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#include "llvm/MC/MCSection.h"
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2015-06-09 01:17:12 +08:00
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#include "llvm/MC/MCSymbolCOFF.h"
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2014-04-27 11:48:05 +08:00
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#include "llvm/MC/MCWinCOFFStreamer.h"
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2017-06-06 19:49:48 +08:00
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#include "llvm/Support/Casting.h"
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2010-07-12 06:05:00 +08:00
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#include "llvm/Support/ErrorHandling.h"
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2014-10-08 03:37:57 +08:00
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#include "llvm/Support/MathExtras.h"
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2017-02-08 07:02:00 +08:00
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#include "llvm/Support/SMLoc.h"
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2017-06-06 19:49:48 +08:00
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#include "llvm/Support/raw_ostream.h"
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2017-02-08 07:02:00 +08:00
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#include <algorithm>
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#include <cassert>
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#include <cstdint>
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2011-12-17 09:14:52 +08:00
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2010-07-12 06:05:00 +08:00
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using namespace llvm;
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2014-04-22 11:04:17 +08:00
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#define DEBUG_TYPE "WinCOFFStreamer"
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2017-10-11 09:57:21 +08:00
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MCWinCOFFStreamer::MCWinCOFFStreamer(MCContext &Context,
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std::unique_ptr<MCAsmBackend> MAB,
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2017-10-12 07:34:47 +08:00
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std::unique_ptr<MCCodeEmitter> CE,
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2018-05-19 02:26:45 +08:00
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std::unique_ptr<MCObjectWriter> OW)
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: MCObjectStreamer(Context, std::move(MAB), std::move(OW), std::move(CE)),
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2017-10-12 07:34:47 +08:00
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CurSymbol(nullptr) {}
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2010-07-19 14:13:10 +08:00
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2020-04-20 17:53:00 +08:00
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void MCWinCOFFStreamer::emitInstToData(const MCInst &Inst,
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2014-04-27 11:48:05 +08:00
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const MCSubtargetInfo &STI) {
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MCDataFragment *DF = getOrCreateDataFragment();
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SmallVector<MCFixup, 4> Fixups;
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SmallString<256> Code;
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raw_svector_ostream VecOS(Code);
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2015-05-16 03:13:16 +08:00
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getAssembler().getEmitter().encodeInstruction(Inst, VecOS, Fixups, STI);
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2014-04-27 11:48:05 +08:00
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// Add the fixups and data.
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for (unsigned i = 0, e = Fixups.size(); i != e; ++i) {
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Fixups[i].setOffset(Fixups[i].getOffset() + DF->getContents().size());
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DF->getFixups().push_back(Fixups[i]);
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}
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2018-06-06 17:40:06 +08:00
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DF->setHasInstructions(STI);
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2014-04-27 11:48:05 +08:00
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DF->getContents().append(Code.begin(), Code.end());
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}
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2010-07-12 06:05:00 +08:00
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2014-10-16 00:12:52 +08:00
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void MCWinCOFFStreamer::InitSections(bool NoExecStack) {
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2014-01-24 10:28:11 +08:00
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// FIXME: this is identical to the ELF one.
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// This emulates the same behavior of GNU as. This makes it easier
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// to compare the output as the major sections are in the same order.
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SwitchSection(getContext().getObjectFileInfo()->getTextSection());
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2020-02-15 11:21:58 +08:00
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emitCodeAlignment(4);
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2014-01-24 10:28:11 +08:00
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SwitchSection(getContext().getObjectFileInfo()->getDataSection());
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2020-02-15 11:21:58 +08:00
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emitCodeAlignment(4);
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2014-01-24 10:28:11 +08:00
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SwitchSection(getContext().getObjectFileInfo()->getBSSSection());
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2020-02-15 11:21:58 +08:00
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emitCodeAlignment(4);
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2014-01-24 10:28:11 +08:00
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SwitchSection(getContext().getObjectFileInfo()->getTextSection());
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2010-09-16 05:48:40 +08:00
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}
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2020-02-15 11:21:58 +08:00
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void MCWinCOFFStreamer::emitLabel(MCSymbol *S, SMLoc Loc) {
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2016-07-09 05:54:16 +08:00
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auto *Symbol = cast<MCSymbolCOFF>(S);
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2020-02-15 11:21:58 +08:00
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MCObjectStreamer::emitLabel(Symbol, Loc);
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2010-11-29 00:22:59 +08:00
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}
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2020-02-15 10:16:24 +08:00
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void MCWinCOFFStreamer::emitAssemblerFlag(MCAssemblerFlag Flag) {
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2019-09-04 02:16:52 +08:00
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// Let the target do whatever target specific stuff it needs to do.
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getAssembler().getBackend().handleAssemblerFlag(Flag);
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switch (Flag) {
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// None of these require COFF specific handling.
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case MCAF_SyntaxUnified:
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case MCAF_Code16:
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case MCAF_Code32:
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case MCAF_Code64:
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break;
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case MCAF_SubsectionsViaSymbols:
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llvm_unreachable("COFF doesn't support .subsections_via_symbols");
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}
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2010-07-12 06:05:00 +08:00
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}
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2020-02-15 10:16:24 +08:00
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void MCWinCOFFStreamer::emitThumbFunc(MCSymbol *Func) {
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2010-11-06 06:08:08 +08:00
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llvm_unreachable("not implemented");
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}
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2020-11-03 04:32:06 +08:00
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bool MCWinCOFFStreamer::emitSymbolAttribute(MCSymbol *S,
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MCSymbolAttr Attribute) {
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2016-07-09 05:54:16 +08:00
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auto *Symbol = cast<MCSymbolCOFF>(S);
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2015-05-30 04:21:02 +08:00
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getAssembler().registerSymbol(*Symbol);
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2014-04-27 11:48:01 +08:00
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2010-07-19 14:13:10 +08:00
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switch (Attribute) {
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2014-04-27 11:48:01 +08:00
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default: return false;
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2010-07-19 14:13:10 +08:00
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case MCSA_WeakReference:
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2014-04-27 11:48:01 +08:00
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case MCSA_Weak:
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2016-07-09 05:54:16 +08:00
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Symbol->setIsWeakExternal();
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2015-05-30 05:45:01 +08:00
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Symbol->setExternal(true);
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2010-07-19 14:13:10 +08:00
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break;
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case MCSA_Global:
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2015-05-30 05:45:01 +08:00
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Symbol->setExternal(true);
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2010-07-19 14:13:10 +08:00
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break;
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2016-04-09 01:38:51 +08:00
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case MCSA_AltEntry:
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2016-04-12 02:33:45 +08:00
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llvm_unreachable("COFF doesn't support the .alt_entry attribute");
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2010-07-19 14:13:10 +08:00
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}
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2013-08-09 09:52:03 +08:00
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return true;
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2010-07-12 06:05:00 +08:00
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}
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2020-02-15 10:16:24 +08:00
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void MCWinCOFFStreamer::emitSymbolDesc(MCSymbol *Symbol, unsigned DescValue) {
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2010-07-19 14:13:10 +08:00
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llvm_unreachable("not implemented");
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2010-07-12 06:05:00 +08:00
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}
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2016-07-09 05:54:16 +08:00
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void MCWinCOFFStreamer::BeginCOFFSymbolDef(MCSymbol const *S) {
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auto *Symbol = cast<MCSymbolCOFF>(S);
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2014-05-22 10:18:10 +08:00
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if (CurSymbol)
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2015-11-17 18:00:43 +08:00
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Error("starting a new symbol definition without completing the "
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"previous one");
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2010-07-19 14:13:10 +08:00
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CurSymbol = Symbol;
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2010-07-12 06:05:00 +08:00
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}
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2014-04-27 11:48:05 +08:00
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void MCWinCOFFStreamer::EmitCOFFSymbolStorageClass(int StorageClass) {
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2015-11-17 18:00:43 +08:00
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if (!CurSymbol) {
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Error("storage class specified outside of symbol definition");
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return;
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}
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2014-05-22 10:18:10 +08:00
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2015-11-17 18:00:43 +08:00
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if (StorageClass & ~COFF::SSC_Invalid) {
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Error("storage class value '" + Twine(StorageClass) +
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2014-05-22 10:18:10 +08:00
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"' out of range");
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2015-11-17 18:00:43 +08:00
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return;
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}
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2010-07-19 14:13:10 +08:00
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2015-05-30 04:21:02 +08:00
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getAssembler().registerSymbol(*CurSymbol);
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2015-06-09 01:17:19 +08:00
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cast<MCSymbolCOFF>(CurSymbol)->setClass((uint16_t)StorageClass);
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2010-07-12 06:05:00 +08:00
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}
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2014-04-27 11:48:05 +08:00
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void MCWinCOFFStreamer::EmitCOFFSymbolType(int Type) {
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2015-11-17 18:00:43 +08:00
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if (!CurSymbol) {
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Error("symbol type specified outside of a symbol definition");
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return;
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}
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2014-05-22 10:18:10 +08:00
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2015-11-17 18:00:43 +08:00
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if (Type & ~0xffff) {
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Error("type value '" + Twine(Type) + "' out of range");
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return;
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}
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2010-07-19 14:13:10 +08:00
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2015-05-30 04:21:02 +08:00
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getAssembler().registerSymbol(*CurSymbol);
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2015-06-09 01:17:12 +08:00
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cast<MCSymbolCOFF>(CurSymbol)->setType((uint16_t)Type);
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2010-07-12 06:05:00 +08:00
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}
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2014-04-27 11:48:05 +08:00
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void MCWinCOFFStreamer::EndCOFFSymbolDef() {
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2014-05-22 10:18:10 +08:00
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if (!CurSymbol)
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2015-11-17 18:00:43 +08:00
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Error("ending symbol definition without starting one");
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2014-04-13 12:57:38 +08:00
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CurSymbol = nullptr;
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2010-07-12 06:05:00 +08:00
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}
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2015-05-30 12:56:02 +08:00
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void MCWinCOFFStreamer::EmitCOFFSafeSEH(MCSymbol const *Symbol) {
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2015-06-01 15:34:26 +08:00
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// SafeSEH is a feature specific to 32-bit x86. It does not exist (and is
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// unnecessary) on all platforms which use table-based exception dispatch.
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if (getContext().getObjectFileInfo()->getTargetTriple().getArch() !=
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Triple::x86)
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return;
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2015-06-10 09:02:30 +08:00
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const MCSymbolCOFF *CSymbol = cast<MCSymbolCOFF>(Symbol);
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if (CSymbol->isSafeSEH())
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2015-05-30 12:56:02 +08:00
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return;
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MCSection *SXData = getContext().getObjectFileInfo()->getSXDataSection();
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getAssembler().registerSection(*SXData);
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if (SXData->getAlignment() < 4)
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2019-09-27 20:54:21 +08:00
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SXData->setAlignment(Align(4));
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2015-05-30 12:56:02 +08:00
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2017-11-09 02:57:02 +08:00
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new MCSymbolIdFragment(Symbol, SXData);
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2015-05-30 12:56:02 +08:00
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getAssembler().registerSymbol(*Symbol);
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2015-06-10 09:02:30 +08:00
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CSymbol->setIsSafeSEH();
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// The Microsoft linker requires that the symbol type of a handler be
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// function. Go ahead and oblige it here.
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CSymbol->setType(COFF::IMAGE_SYM_DTYPE_FUNCTION
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<< COFF::SCT_COMPLEX_TYPE_SHIFT);
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2015-05-30 12:56:02 +08:00
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}
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2018-01-10 07:49:30 +08:00
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void MCWinCOFFStreamer::EmitCOFFSymbolIndex(MCSymbol const *Symbol) {
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MCSection *Sec = getCurrentSectionOnly();
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getAssembler().registerSection(*Sec);
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if (Sec->getAlignment() < 4)
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2019-09-27 20:54:21 +08:00
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Sec->setAlignment(Align(4));
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2018-01-10 07:49:30 +08:00
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new MCSymbolIdFragment(Symbol, getCurrentSectionOnly());
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getAssembler().registerSymbol(*Symbol);
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}
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2017-06-23 05:02:14 +08:00
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void MCWinCOFFStreamer::EmitCOFFSectionIndex(const MCSymbol *Symbol) {
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visitUsedSymbol(*Symbol);
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2013-12-21 02:15:00 +08:00
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MCDataFragment *DF = getOrCreateDataFragment();
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2015-05-30 09:25:56 +08:00
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const MCSymbolRefExpr *SRE = MCSymbolRefExpr::create(Symbol, getContext());
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2015-05-16 03:13:05 +08:00
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MCFixup Fixup = MCFixup::create(DF->getContents().size(), SRE, FK_SecRel_2);
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2014-04-27 11:48:01 +08:00
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DF->getFixups().push_back(Fixup);
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2014-10-09 02:01:49 +08:00
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DF->getContents().resize(DF->getContents().size() + 2, 0);
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2013-12-21 02:15:00 +08:00
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}
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2017-06-23 05:02:14 +08:00
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void MCWinCOFFStreamer::EmitCOFFSecRel32(const MCSymbol *Symbol,
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2017-01-02 11:00:19 +08:00
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uint64_t Offset) {
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2017-06-23 05:02:14 +08:00
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visitUsedSymbol(*Symbol);
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2011-12-17 09:14:52 +08:00
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MCDataFragment *DF = getOrCreateDataFragment();
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2017-01-02 11:00:19 +08:00
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// Create Symbol A for the relocation relative reference.
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const MCExpr *MCE = MCSymbolRefExpr::create(Symbol, getContext());
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// Add the constant offset, if given.
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if (Offset)
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MCE = MCBinaryExpr::createAdd(
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MCE, MCConstantExpr::create(Offset, getContext()), getContext());
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// Build the secrel32 relocation.
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MCFixup Fixup = MCFixup::create(DF->getContents().size(), MCE, FK_SecRel_4);
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// Record the relocation.
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2014-04-27 11:48:01 +08:00
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DF->getFixups().push_back(Fixup);
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2017-01-02 11:00:19 +08:00
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// Emit 4 bytes (zeros) to the object file.
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2011-12-17 09:14:52 +08:00
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DF->getContents().resize(DF->getContents().size() + 4, 0);
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}
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2018-07-27 04:11:26 +08:00
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void MCWinCOFFStreamer::EmitCOFFImgRel32(const MCSymbol *Symbol,
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int64_t Offset) {
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visitUsedSymbol(*Symbol);
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MCDataFragment *DF = getOrCreateDataFragment();
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// Create Symbol A for the relocation relative reference.
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const MCExpr *MCE = MCSymbolRefExpr::create(
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Symbol, MCSymbolRefExpr::VK_COFF_IMGREL32, getContext());
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// Add the constant offset, if given.
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if (Offset)
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MCE = MCBinaryExpr::createAdd(
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MCE, MCConstantExpr::create(Offset, getContext()), getContext());
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// Build the imgrel relocation.
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MCFixup Fixup = MCFixup::create(DF->getContents().size(), MCE, FK_Data_4);
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// Record the relocation.
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DF->getFixups().push_back(Fixup);
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// Emit 4 bytes (zeros) to the object file.
|
|
|
|
DF->getContents().resize(DF->getContents().size() + 4, 0);
|
|
|
|
}
|
|
|
|
|
2020-02-15 10:16:24 +08:00
|
|
|
void MCWinCOFFStreamer::emitCommonSymbol(MCSymbol *S, uint64_t Size,
|
2014-04-27 11:48:05 +08:00
|
|
|
unsigned ByteAlignment) {
|
2016-07-09 05:54:16 +08:00
|
|
|
auto *Symbol = cast<MCSymbolCOFF>(S);
|
2014-04-09 06:33:40 +08:00
|
|
|
|
2014-09-21 17:18:07 +08:00
|
|
|
const Triple &T = getContext().getObjectFileInfo()->getTargetTriple();
|
2019-07-09 05:05:20 +08:00
|
|
|
if (T.isWindowsMSVCEnvironment()) {
|
2014-09-21 17:18:07 +08:00
|
|
|
if (ByteAlignment > 32)
|
|
|
|
report_fatal_error("alignment is limited to 32-bytes");
|
2014-10-08 03:37:57 +08:00
|
|
|
|
2014-10-08 14:38:53 +08:00
|
|
|
// Round size up to alignment so that we will honor the alignment request.
|
|
|
|
Size = std::max(Size, static_cast<uint64_t>(ByteAlignment));
|
|
|
|
}
|
2014-04-09 06:33:40 +08:00
|
|
|
|
2015-05-30 04:21:02 +08:00
|
|
|
getAssembler().registerSymbol(*Symbol);
|
2015-05-30 05:45:01 +08:00
|
|
|
Symbol->setExternal(true);
|
2015-05-30 01:48:04 +08:00
|
|
|
Symbol->setCommon(Size, ByteAlignment);
|
2014-10-08 03:37:57 +08:00
|
|
|
|
2019-07-09 05:05:20 +08:00
|
|
|
if (!T.isWindowsMSVCEnvironment() && ByteAlignment > 1) {
|
2014-10-08 03:37:57 +08:00
|
|
|
SmallString<128> Directive;
|
|
|
|
raw_svector_ostream OS(Directive);
|
|
|
|
const MCObjectFileInfo *MFI = getContext().getObjectFileInfo();
|
|
|
|
|
|
|
|
OS << " -aligncomm:\"" << Symbol->getName() << "\","
|
|
|
|
<< Log2_32_Ceil(ByteAlignment);
|
|
|
|
|
|
|
|
PushSection();
|
|
|
|
SwitchSection(MFI->getDrectveSection());
|
2020-02-15 10:16:24 +08:00
|
|
|
emitBytes(Directive);
|
2014-10-08 03:37:57 +08:00
|
|
|
PopSection();
|
|
|
|
}
|
2010-07-12 06:05:00 +08:00
|
|
|
}
|
|
|
|
|
2020-02-15 10:16:24 +08:00
|
|
|
void MCWinCOFFStreamer::emitLocalCommonSymbol(MCSymbol *S, uint64_t Size,
|
2014-04-27 11:48:05 +08:00
|
|
|
unsigned ByteAlignment) {
|
2016-07-09 05:54:16 +08:00
|
|
|
auto *Symbol = cast<MCSymbolCOFF>(S);
|
2014-04-09 06:33:40 +08:00
|
|
|
|
2015-05-22 03:20:38 +08:00
|
|
|
MCSection *Section = getContext().getObjectFileInfo()->getBSSSection();
|
2018-01-10 05:55:10 +08:00
|
|
|
PushSection();
|
|
|
|
SwitchSection(Section);
|
2020-02-15 11:21:58 +08:00
|
|
|
emitValueToAlignment(ByteAlignment, 0, 1, 0);
|
|
|
|
emitLabel(Symbol);
|
2015-05-30 05:45:01 +08:00
|
|
|
Symbol->setExternal(false);
|
2020-02-16 00:52:56 +08:00
|
|
|
emitZeros(Size);
|
2018-01-10 05:55:10 +08:00
|
|
|
PopSection();
|
2010-07-12 06:05:00 +08:00
|
|
|
}
|
|
|
|
|
2020-09-30 04:59:42 +08:00
|
|
|
void MCWinCOFFStreamer::emitWeakReference(MCSymbol *AliasS,
|
|
|
|
const MCSymbol *Symbol) {
|
|
|
|
auto *Alias = cast<MCSymbolCOFF>(AliasS);
|
|
|
|
emitSymbolAttribute(Alias, MCSA_Weak);
|
|
|
|
|
|
|
|
getAssembler().registerSymbol(*Symbol);
|
|
|
|
Alias->setVariableValue(MCSymbolRefExpr::create(
|
|
|
|
Symbol, MCSymbolRefExpr::VK_WEAKREF, getContext()));
|
|
|
|
}
|
|
|
|
|
2020-02-15 10:16:24 +08:00
|
|
|
void MCWinCOFFStreamer::emitZerofill(MCSection *Section, MCSymbol *Symbol,
|
2018-07-03 01:29:43 +08:00
|
|
|
uint64_t Size, unsigned ByteAlignment,
|
|
|
|
SMLoc Loc) {
|
2010-07-19 14:13:10 +08:00
|
|
|
llvm_unreachable("not implemented");
|
2010-07-12 06:05:00 +08:00
|
|
|
}
|
|
|
|
|
2020-02-16 00:52:56 +08:00
|
|
|
void MCWinCOFFStreamer::emitTBSSSymbol(MCSection *Section, MCSymbol *Symbol,
|
2015-05-22 03:20:38 +08:00
|
|
|
uint64_t Size, unsigned ByteAlignment) {
|
2010-07-19 14:13:10 +08:00
|
|
|
llvm_unreachable("not implemented");
|
2010-07-12 06:05:00 +08:00
|
|
|
}
|
|
|
|
|
2013-10-16 09:05:45 +08:00
|
|
|
// TODO: Implement this if you want to emit .comment section in COFF obj files.
|
2020-02-16 00:52:56 +08:00
|
|
|
void MCWinCOFFStreamer::emitIdent(StringRef IdentString) {
|
2014-04-27 11:48:01 +08:00
|
|
|
llvm_unreachable("not implemented");
|
2013-10-16 09:05:45 +08:00
|
|
|
}
|
|
|
|
|
2017-10-10 09:26:25 +08:00
|
|
|
void MCWinCOFFStreamer::EmitWinEHHandlerData(SMLoc Loc) {
|
2014-04-27 11:48:12 +08:00
|
|
|
llvm_unreachable("not implemented");
|
2011-05-22 11:01:05 +08:00
|
|
|
}
|
|
|
|
|
2020-06-26 11:35:03 +08:00
|
|
|
void MCWinCOFFStreamer::emitCGProfileEntry(const MCSymbolRefExpr *From,
|
|
|
|
const MCSymbolRefExpr *To,
|
|
|
|
uint64_t Count) {
|
|
|
|
// Ignore temporary symbols for now.
|
|
|
|
if (!From->getSymbol().isTemporary() && !To->getSymbol().isTemporary())
|
|
|
|
getAssembler().CGProfile.push_back({From, To, Count});
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCWinCOFFStreamer::finalizeCGProfileEntry(const MCSymbolRefExpr *&SRE) {
|
|
|
|
const MCSymbol *S = &SRE->getSymbol();
|
|
|
|
bool Created;
|
|
|
|
getAssembler().registerSymbol(*S, &Created);
|
2020-09-29 08:17:23 +08:00
|
|
|
if (Created)
|
2020-06-26 11:35:03 +08:00
|
|
|
cast<MCSymbolCOFF>(S)->setExternal(true);
|
|
|
|
}
|
|
|
|
|
|
|
|
void MCWinCOFFStreamer::finalizeCGProfile() {
|
|
|
|
for (MCAssembler::CGProfileEntry &E : getAssembler().CGProfile) {
|
|
|
|
finalizeCGProfileEntry(E.From);
|
|
|
|
finalizeCGProfileEntry(E.To);
|
|
|
|
}
|
|
|
|
}
|
|
|
|
|
2020-04-21 10:28:13 +08:00
|
|
|
void MCWinCOFFStreamer::finishImpl() {
|
2020-06-26 11:35:03 +08:00
|
|
|
finalizeCGProfile();
|
|
|
|
|
2020-04-21 10:28:13 +08:00
|
|
|
MCObjectStreamer::finishImpl();
|
2010-07-12 06:05:00 +08:00
|
|
|
}
|
2014-05-22 10:18:10 +08:00
|
|
|
|
2015-11-17 18:00:43 +08:00
|
|
|
void MCWinCOFFStreamer::Error(const Twine &Msg) const {
|
|
|
|
getContext().reportError(SMLoc(), Msg);
|
2014-05-22 10:18:10 +08:00
|
|
|
}
|