J9CodeGenerator.hpp

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 * Copyright (c) 2000, 2022 IBM Corp. and others
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 * This program and the accompanying materials are made available under
 * the terms of the Eclipse Public License 2.0 which accompanies this
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 * is available at https://www.apache.org/licenses/LICENSE-2.0.
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 * forth in the Eclipse Public License, v. 2.0 are satisfied: GNU
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 * 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
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#ifndef J9_X86_CODEGENERATOR_INCL
#define J9_X86_CODEGENERATOR_INCL

#include "compiler/codegen/J9CodeGenerator.hpp"

namespace TR { class Recompilation; }

namespace J9
{

namespace X86
{

class OMR_EXTENSIBLE CodeGenerator : public J9::CodeGenerator
   {

protected:

   CodeGenerator(TR::Compilation *comp);

public:

   void initialize();

   TR::Recompilation *allocateRecompilationInfo();

   void beginInstructionSelection();

   void endInstructionSelection();

   TR::Instruction *generateSwitchToInterpreterPrePrologue(
         TR::Instruction *prev,
         uint8_t alignment,
         uint8_t alignmentMargin);

   // Stack frame padding
   int32_t getStackFramePaddingSizeInBytes() {return _stackFramePaddingSizeInBytes;}
   int32_t setStackFramePaddingSizeInBytes(int32_t s) {return (_stackFramePaddingSizeInBytes = s);}
   int32_t _stackFramePaddingSizeInBytes;

   bool nopsAlsoProcessedByRelocations();

#ifdef J9VM_OPT_JAVA_CRYPTO_ACCELERATION
   bool inlineCryptoMethod(TR::Node *node, TR::Register *&resultReg);
#endif

   bool enableAESInHardwareTransformations();

   bool suppressInliningOfRecognizedMethod(TR::RecognizedMethod method);

   /** \brief
    *     Determines whether the code generator supports inlining of java/lang/Class.isAssignableFrom
    */
   bool supportsInliningOfIsAssignableFrom();

   /*
    * \brief Reserve space in the code cache for a specified number of trampolines.
    *        This is useful for inline caches where the methods are not yet known at
    *        compile-time but for which trampolines may be required for compiled
    *        bodies in the future.
    *
    * \param[in] numTrampolines : number of trampolines to reserve
    *
    * \return : none
    */
   void reserveNTrampolines(int32_t numTrampolines);

   /**
    * \brief Determines whether the code generator supports stack allocations
    */
   bool supportsStackAllocations() { return true; }
   /** \brief
    *     Determines whether to insert instructions to check DF flag and break on DF set
    */
   bool canEmitBreakOnDFSet();

   // See J9::CodeGenerator::guaranteesResolvedDirectDispatchForSVM
   bool guaranteesResolvedDirectDispatchForSVM() { return true; }

   // See J9::CodeGenerator::guaranteesResolvedVirtualDispatchForSVM
   bool guaranteesResolvedVirtualDispatchForSVM() { return true; }
   };

}

}

#endif