AOTClassInfo.hpp

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 * Copyright (c) 2000, 2021 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
 * General Public License, version 2 with the GNU Classpath
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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 TR_AOTCLASSINFO_INCL
#define TR_AOTCLASSINFO_INCL

#include "env/FrontEnd.hpp"
#include "runtime/J9Runtime.hpp"
#include "env/jittypes.h"
#include "env/VMJ9.h"

class AOTCacheClassChainRecord;


// AOTClassInfo is a structure used to record assumptions on classes made by the
// current compilation.  There are two types of validations: ones based on a
// constant pool entry, and ones that are not (could be recognized method where
// we don't have the cp info or could be based on profile data)
//
// TR_ValidateClass, TR_ValidateStaticField, TR_ValidateInstanceField are all
// based on a constant pool entry
//
// TR_ValidateArbitraryClass is not based on a constant pool entry
//
// First class of validation has _cpIndex >= 0, second class has _cpIndex == -1
//

namespace TR
{

class AOTClassInfo
   {
public:

   TR_ALLOC(TR_Memory::AOTClassInfo)

   AOTClassInfo(
         TR_FrontEnd *fe,
         TR_OpaqueClassBlock *clazz,
         void *classChain,
         TR_OpaqueMethodBlock *method,
         uint32_t cpIndex,
         TR_ExternalRelocationTargetKind reloKind,
         const AOTCacheClassChainRecord *aotCacheClassChainRecord = NULL
   ) :
      _clazz(clazz),
      _classChain(classChain),
      _method(method),
      _constantPool((void *) ((TR_J9VMBase *)fe)->getConstantPoolFromMethod(method)),
      _cpIndex(cpIndex),
      _reloKind(reloKind)
      {
#if defined(J9VM_OPT_JITSERVER)
      TR_ASSERT(!aotCacheClassChainRecord || (fe->getPersistentInfo()->getRemoteCompilationMode() == JITServer::SERVER),
                "Must always be NULL at JIT client");
      _aotCacheClassChainRecord = aotCacheClassChainRecord;
#endif /* defined(J9VM_OPT_JITSERVER) */
      }

#if defined(J9VM_OPT_JITSERVER)
   const AOTCacheClassChainRecord *getAOTCacheClassChainRecord() { return _aotCacheClassChainRecord; }
#else /* defined(J9VM_OPT_JITSERVER) */
   const AOTCacheClassChainRecord *getAOTCacheClassChainRecord() { return NULL; }
#endif /* defined(J9VM_OPT_JITSERVER) */

   TR_ExternalRelocationTargetKind _reloKind;   // identifies validation needed (instance field, static field, class, arbitrary class)
   uint32_t _cpIndex;                           // cpindex identifying the cp entry if known otherwise -1
   TR_OpaqueMethodBlock *_method;               // inlined method owning the cp entry or to which assumption is attached
                                                // _method must be compiled method or some method in the inlined site table
   void *_constantPool;                         // constant pool owning the cp entry, initialized based on _method
   TR_OpaqueClassBlock *_clazz;                 // class on which assumption is formed
   void *_classChain;                           // class chain for clazz: captures the assumption
                                                // == NULL for TR_ValidateStaticField validations
#if defined(J9VM_OPT_JITSERVER)
   const AOTCacheClassChainRecord *_aotCacheClassChainRecord; // NULL at JITServer if compiled method won't be cached
                                                              // Always NULL at JIT client
#endif /* defined(J9VM_OPT_JITSERVER) */
   };

}

#endif