J9CodeGenerator.hpp

/*******************************************************************************
 * Copyright (c) 2019, 2021 IBM Corp. and others
 *
 * 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] http://openjdk.java.net/legal/assembly-exception.html
 *
 * SPDX-License-Identifier: EPL-2.0 OR Apache-2.0 OR GPL-2.0 WITH Classpath-exception-2.0 OR LicenseRef-GPL-2.0 WITH Assembly-exception
 *******************************************************************************/

#ifndef J9_ARM64_CODEGENERATOR_INCL
#define J9_ARM64_CODEGENERATOR_INCL

/*
 * The following #define and typedef must appear before any #includes in this file
 */
#ifndef J9_CODEGENERATOR_CONNECTOR
#define J9_CODEGENERATOR_CONNECTOR
namespace J9 { namespace ARM64 { class CodeGenerator; } }
namespace J9 { typedef J9::ARM64::CodeGenerator CodeGeneratorConnector; }
#else
#error J9::ARM64::CodeGenerator expected to be a primary connector, but a J9 connector is already defined
#endif

#include "compiler/codegen/J9CodeGenerator.hpp"
#include "codegen/LinkageConventionsEnum.hpp"

namespace TR { class Recompilation; }

namespace J9
{

namespace ARM64
{

class OMR_EXTENSIBLE CodeGenerator : public J9::CodeGenerator
   {

protected:

   CodeGenerator(TR::Compilation *comp);

public:

   void initialize();

   /**
    * @brief Allocates recompilation information
    */
   TR::Recompilation *allocateRecompilationInfo();

   /**
    * @brief Gets or creates a TR::Linkage object
    * @param[in] lc : linkage convention
    * @return created linkage object
    */
   TR::Linkage *createLinkage(TR_LinkageConventions lc);

   /**
    * @brief Encode a BL (or B) instruction to the specified symbol
    * @param[in] symRef : target symbol
    * @param[in] cursor : instruction cursor
    * @param[in] node : node
    * @param[in] omitLink : use `b` instruction if true
    * @return Endoded BL (or B) instruction
    */
   uint32_t encodeHelperBranchAndLink(TR::SymbolReference *symRef, uint8_t *cursor, TR::Node *node, bool omitLink = false);

   bool inlineDirectCall(TR::Node *node, TR::Register *&resultReg);

   /**
    * @brief Generates pre-prologue
    * @param[in] data : binary encoding data
    */
   void generateBinaryEncodingPrePrologue(TR_ARM64BinaryEncodingData &data);

   /**
    * @brief Generates switch-to-interpreter pre-prologue
    * @param[in] cursor : cursor
    * @param[in] node : node
    */
   TR::Instruction *generateSwitchToInterpreterPrePrologue(TR::Instruction *cursor, TR::Node *node);

   bool supportsDirectJNICallsForAOT() { return true; }

   /**
    * \brief Determines whether the code generator supports stack allocations
    */
   bool supportsStackAllocations() { return true; }

   /**
    * @brief Answers whether isInstance inline fast helper is supported
    * @return true if isInstance inline fast helper is supported
    */
   bool supportsInliningOfIsInstance();

   /**
    * @brief Answers whether inlining of the specified recognized method should be suppressed
    * @return true if inlining of the method should be suppressed
    */
   bool suppressInliningOfRecognizedMethod(TR::RecognizedMethod method);
   };

}

}

#endif