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//===-- VEMCCodeEmitter.cpp - Convert VE code to machine code -------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements the VEMCCodeEmitter class.
//
//===----------------------------------------------------------------------===//
#include "MCTargetDesc/VEFixupKinds.h"
#include "VE.h"
#include "VEMCExpr.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCFixup.h"
#include "llvm/MC/MCInst.h"
#include "llvm/MC/MCInstrInfo.h"
#include "llvm/MC/MCRegisterInfo.h"
#include "llvm/MC/MCSubtargetInfo.h"
#include "llvm/MC/MCSymbol.h"
#include "llvm/Support/EndianStream.h"
#include "llvm/Support/ErrorHandling.h"
#include "llvm/Support/raw_ostream.h"
#include <cassert>
#include <cstdint>
using namespace llvm;
#define DEBUG_TYPE "mccodeemitter"
STATISTIC(MCNumEmitted, "Number of MC instructions emitted");
namespace {
class VEMCCodeEmitter : public MCCodeEmitter {
MCContext &Ctx;
public:
VEMCCodeEmitter(const MCInstrInfo &, MCContext &ctx)
: Ctx(ctx) {}
VEMCCodeEmitter(const VEMCCodeEmitter &) = delete;
VEMCCodeEmitter &operator=(const VEMCCodeEmitter &) = delete;
~VEMCCodeEmitter() override = default;
void encodeInstruction(const MCInst &MI, SmallVectorImpl<char> &CB,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const override;
// getBinaryCodeForInstr - TableGen'erated function for getting the
// binary encoding for an instruction.
uint64_t getBinaryCodeForInstr(const MCInst &MI,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
/// getMachineOpValue - Return binary encoding of operand. If the machine
/// operand requires relocation, record the relocation and return zero.
unsigned getMachineOpValue(const MCInst &MI, const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint64_t getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint64_t getCCOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
uint64_t getRDOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const;
};
} // end anonymous namespace
void VEMCCodeEmitter::encodeInstruction(const MCInst &MI,
SmallVectorImpl<char> &CB,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
uint64_t Bits = getBinaryCodeForInstr(MI, Fixups, STI);
support::endian::write<uint64_t>(CB, Bits, support::little);
++MCNumEmitted; // Keep track of the # of mi's emitted.
}
unsigned VEMCCodeEmitter::getMachineOpValue(const MCInst &MI,
const MCOperand &MO,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
if (MO.isReg())
return Ctx.getRegisterInfo()->getEncodingValue(MO.getReg());
if (MO.isImm())
return static_cast<unsigned>(MO.getImm());
assert(MO.isExpr());
const MCExpr *Expr = MO.getExpr();
if (const VEMCExpr *SExpr = dyn_cast<VEMCExpr>(Expr)) {
MCFixupKind Kind = (MCFixupKind)SExpr->getFixupKind();
Fixups.push_back(MCFixup::create(0, Expr, Kind));
return 0;
}
int64_t Res;
if (Expr->evaluateAsAbsolute(Res))
return Res;
llvm_unreachable("Unhandled expression!");
return 0;
}
uint64_t
VEMCCodeEmitter::getBranchTargetOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isReg() || MO.isImm())
return getMachineOpValue(MI, MO, Fixups, STI);
Fixups.push_back(
MCFixup::create(0, MO.getExpr(), (MCFixupKind)VE::fixup_ve_srel32));
return 0;
}
uint64_t VEMCCodeEmitter::getCCOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isImm())
return VECondCodeToVal(
static_cast<VECC::CondCode>(getMachineOpValue(MI, MO, Fixups, STI)));
return 0;
}
uint64_t VEMCCodeEmitter::getRDOpValue(const MCInst &MI, unsigned OpNo,
SmallVectorImpl<MCFixup> &Fixups,
const MCSubtargetInfo &STI) const {
const MCOperand &MO = MI.getOperand(OpNo);
if (MO.isImm())
return VERDToVal(static_cast<VERD::RoundingMode>(
getMachineOpValue(MI, MO, Fixups, STI)));
return 0;
}
#include "VEGenMCCodeEmitter.inc"
MCCodeEmitter *llvm::createVEMCCodeEmitter(const MCInstrInfo &MCII,
MCContext &Ctx) {
return new VEMCCodeEmitter(MCII, Ctx);
}
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