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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
130 lines
4.5 KiB
C++
130 lines
4.5 KiB
C++
//===- MCAsmBackend.cpp - Target MC Assembly Backend ----------------------===//
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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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#include "llvm/MC/MCAsmBackend.h"
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#include "llvm/ADT/None.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/MC/MCCodePadder.h"
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#include "llvm/MC/MCELFObjectWriter.h"
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#include "llvm/MC/MCFixupKindInfo.h"
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#include "llvm/MC/MCMachObjectWriter.h"
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#include "llvm/MC/MCObjectWriter.h"
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#include "llvm/MC/MCWasmObjectWriter.h"
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#include "llvm/MC/MCWinCOFFObjectWriter.h"
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#include <cassert>
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#include <cstddef>
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#include <cstdint>
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using namespace llvm;
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MCAsmBackend::MCAsmBackend(support::endianness Endian)
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: CodePadder(new MCCodePadder()), Endian(Endian) {}
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MCAsmBackend::~MCAsmBackend() = default;
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std::unique_ptr<MCObjectWriter>
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MCAsmBackend::createObjectWriter(raw_pwrite_stream &OS) const {
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auto TW = createObjectTargetWriter();
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switch (TW->getFormat()) {
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case Triple::ELF:
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return createELFObjectWriter(cast<MCELFObjectTargetWriter>(std::move(TW)), OS,
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Endian == support::little);
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case Triple::MachO:
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return createMachObjectWriter(cast<MCMachObjectTargetWriter>(std::move(TW)),
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OS, Endian == support::little);
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case Triple::COFF:
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return createWinCOFFObjectWriter(
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cast<MCWinCOFFObjectTargetWriter>(std::move(TW)), OS);
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case Triple::Wasm:
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return createWasmObjectWriter(cast<MCWasmObjectTargetWriter>(std::move(TW)),
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OS);
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default:
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llvm_unreachable("unexpected object format");
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}
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}
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std::unique_ptr<MCObjectWriter>
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MCAsmBackend::createDwoObjectWriter(raw_pwrite_stream &OS,
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raw_pwrite_stream &DwoOS) const {
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auto TW = createObjectTargetWriter();
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if (TW->getFormat() != Triple::ELF)
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report_fatal_error("dwo only supported with ELF");
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return createELFDwoObjectWriter(cast<MCELFObjectTargetWriter>(std::move(TW)),
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OS, DwoOS, Endian == support::little);
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}
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Optional<MCFixupKind> MCAsmBackend::getFixupKind(StringRef Name) const {
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return None;
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}
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const MCFixupKindInfo &MCAsmBackend::getFixupKindInfo(MCFixupKind Kind) const {
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static const MCFixupKindInfo Builtins[] = {
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{"FK_Data_1", 0, 8, 0},
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{"FK_Data_2", 0, 16, 0},
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{"FK_Data_4", 0, 32, 0},
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{"FK_Data_8", 0, 64, 0},
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{"FK_PCRel_1", 0, 8, MCFixupKindInfo::FKF_IsPCRel},
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{"FK_PCRel_2", 0, 16, MCFixupKindInfo::FKF_IsPCRel},
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{"FK_PCRel_4", 0, 32, MCFixupKindInfo::FKF_IsPCRel},
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{"FK_PCRel_8", 0, 64, MCFixupKindInfo::FKF_IsPCRel},
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{"FK_GPRel_1", 0, 8, 0},
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{"FK_GPRel_2", 0, 16, 0},
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{"FK_GPRel_4", 0, 32, 0},
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{"FK_GPRel_8", 0, 64, 0},
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{"FK_DTPRel_4", 0, 32, 0},
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{"FK_DTPRel_8", 0, 64, 0},
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{"FK_TPRel_4", 0, 32, 0},
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{"FK_TPRel_8", 0, 64, 0},
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{"FK_SecRel_1", 0, 8, 0},
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{"FK_SecRel_2", 0, 16, 0},
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{"FK_SecRel_4", 0, 32, 0},
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{"FK_SecRel_8", 0, 64, 0},
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{"FK_Data_Add_1", 0, 8, 0},
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{"FK_Data_Add_2", 0, 16, 0},
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{"FK_Data_Add_4", 0, 32, 0},
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{"FK_Data_Add_8", 0, 64, 0},
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{"FK_Data_Sub_1", 0, 8, 0},
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{"FK_Data_Sub_2", 0, 16, 0},
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{"FK_Data_Sub_4", 0, 32, 0},
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{"FK_Data_Sub_8", 0, 64, 0}};
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assert((size_t)Kind <= array_lengthof(Builtins) && "Unknown fixup kind");
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return Builtins[Kind];
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}
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bool MCAsmBackend::fixupNeedsRelaxationAdvanced(
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const MCFixup &Fixup, bool Resolved, uint64_t Value,
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const MCRelaxableFragment *DF, const MCAsmLayout &Layout,
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const bool WasForced) const {
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if (!Resolved)
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return true;
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return fixupNeedsRelaxation(Fixup, Value, DF, Layout);
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}
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void MCAsmBackend::handleCodePaddingBasicBlockStart(
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MCObjectStreamer *OS, const MCCodePaddingContext &Context) {
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CodePadder->handleBasicBlockStart(OS, Context);
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}
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void MCAsmBackend::handleCodePaddingBasicBlockEnd(
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const MCCodePaddingContext &Context) {
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CodePadder->handleBasicBlockEnd(Context);
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}
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void MCAsmBackend::handleCodePaddingInstructionBegin(const MCInst &Inst) {
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CodePadder->handleInstructionBegin(Inst);
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}
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void MCAsmBackend::handleCodePaddingInstructionEnd(const MCInst &Inst) {
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CodePadder->handleInstructionEnd(Inst);
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}
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bool MCAsmBackend::relaxFragment(MCPaddingFragment *PF, MCAsmLayout &Layout) {
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return CodePadder->relaxFragment(PF, Layout);
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}
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