forked from OSchip/llvm-project
131 lines
4.5 KiB
C++
131 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_NONE", 0, 0, 0},
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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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