/*******************************************************************************
 * Copyright IBM Corp. and others 2000
 *
 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
 * distribution and is available at https://www.eclipse.org/legal/epl-2.0/
 * or the Apache License, Version 2.0 which accompanies this distribution
 * and is available at https://www.apache.org/licenses/LICENSE-2.0.
 *
 * This Source Code may also be made available under the following Secondary
 * Licenses when the conditions for such availability set forth in the
 * Eclipse Public License, v. 2.0 are satisfied: GNU General Public License,
 * version 2 with the GNU Classpath Exception [1] and GNU General Public
 * License, version 2 with the OpenJDK Assembly Exception [2].
 *
 * [1] https://www.gnu.org/software/classpath/license.html
 * [2] https://openjdk.org/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0-only WITH Classpath-exception-2.0 OR GPL-2.0-only WITH OpenJDK-assembly-exception-1.0
 *******************************************************************************/

#ifndef OMR_ARM_MACHINE_INCL
#define OMR_ARM_MACHINE_INCL

/*
 * The following #define and typedef must appear before any #includes in this file
 */
#ifndef OMR_MACHINE_CONNECTOR
#define OMR_MACHINE_CONNECTOR

namespace OMR {
namespace ARM {
class Machine;
}

typedef OMR::ARM::Machine MachineConnector;
} // namespace OMR
#else
#error OMR::ARM::Machine expected to be a primary connector, but an OMR connector is already defined
#endif

#include "compiler/codegen/OMRMachine.hpp"

#include "codegen/RealRegister.hpp"
#include "infra/TRlist.hpp"

namespace TR {
class CodeGenerator;
class Register;
class RegisterDependencyConditions;
} // namespace TR

#define NUM_ARM_GPR 16
#define NUM_ARM_MAXR 16
#define MAX_ARM_GLOBAL_GPRS 10
#if (defined(__VFP_FP__) && !defined(__SOFTFP__))
#define NUM_ARM_FPR 16
#define MAX_ARM_GLOBAL_FPRS 16
#else
#define NUM_ARM_FPR 8
#define MAX_ARM_GLOBAL_FPRS 8
#endif
#define UPPER_IMMED12 ((1 << 12) - 1)
#define LOWER_IMMED12 (-(1 << 12) + 1)

namespace OMR { namespace ARM {

class OMR_EXTENSIBLE Machine : public OMR::Machine {
    static uint32_t _globalRegisterNumberToRealRegisterMap[MAX_ARM_GLOBAL_GPRS + MAX_ARM_GLOBAL_FPRS];

    void initializeRegisterFile();

    // For register snap shot
    uint16_t _registerFlagsSnapShot[TR::RealRegister::NumRegisters];
    TR::RealRegister::RegState _registerStatesSnapShot[TR::RealRegister::NumRegisters];
    TR::Register *_registerAssociationsSnapShot[TR::RealRegister::NumRegisters];
    TR::Register *_assignedRegisterSnapShot[TR::RealRegister::NumRegisters];

public:
    Machine(TR::CodeGenerator *cg);

    TR::RealRegister *findBestFreeRegister(TR_RegisterKinds rk, bool excludeGPR0 = false,
        bool considerUnlatched = false, bool isSinglePrecision = false);

    TR::RealRegister *freeBestRegister(TR::Instruction *currentInstruction, TR_RegisterKinds rk,
        TR::RealRegister *forced = NULL, bool excludeGPR0 = false, bool isSinglePrecision = false);

    TR::RealRegister *reverseSpillState(TR::Instruction *currentInstruction, TR::Register *spilledRegister,
        TR::RealRegister *targetRegister = NULL, bool excludeGPR0 = false, bool isSinglePrecision = false);

    void coerceRegisterAssignment(TR::Instruction *currentInstruction, TR::Register *virtualRegister,
        TR::RealRegister::RegNum registerNumber);

    bool getLinkRegisterKilled() { return _registerFile[TR::RealRegister::gr14]->getHasBeenAssignedInMethod(); }

    bool setLinkRegisterKilled(bool b) { return _registerFile[TR::RealRegister::gr14]->setHasBeenAssignedInMethod(b); }

    // Snap shot methods
    void takeRegisterStateSnapShot();
    void restoreRegisterStateFromSnapShot();
    TR::RegisterDependencyConditions *createCondForLiveAndSpilledGPRs(
        TR::list<TR::Register *> *spilledRegisterList = NULL);

    TR::RealRegister *assignSingleRegister(TR::Register *virtualRegister, TR::Instruction *currentInstruction);

    static uint32_t *getGlobalRegisterTable() { return _globalRegisterNumberToRealRegisterMap; }

    static TR_GlobalRegisterNumber getLastGlobalGPRRegisterNumber() { return MAX_ARM_GLOBAL_GPRS - 1; }

    static TR_GlobalRegisterNumber getLast8BitGlobalGPRRegisterNumber() { return MAX_ARM_GLOBAL_GPRS - 1; }

    static TR_GlobalRegisterNumber getLastGlobalFPRRegisterNumber()
    {
        return MAX_ARM_GLOBAL_GPRS + MAX_ARM_GLOBAL_FPRS - 1;
    }
};

}} // namespace OMR::ARM
#endif
