delta.cpp

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/* Copyright 1994 - 1996, LongView Technologies L.L.C. $Revision: 1.6 $ */
/* Copyright (c) 2006, Sun Microsystems, Inc.
All rights reserved.

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          disclaimer in the documentation and/or other materials provided with the distribution.
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          from this software without specific prior written permission.

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# include "incls/_precompiled.incl"
# include "incls/_delta.cpp.incl"

// Implementation of DeltaCallCache

DeltaCallCache* DeltaCallCache::_root = NULL;   // anchor of all DeltaCallCaches


DeltaCallCache::DeltaCallCache() {
  _link = _root;
  _root = this;
  clear();
}


void DeltaCallCache::clear() {
  _key.clear();
  _result.clear();
}


void DeltaCallCache::clearAll() {
  DeltaCallCache* p = _root;
  while (p != NULL) {
    p->clear();
    p = p->_link;
  }
}


// Implementation of Delta

extern "C" oop call_delta(void* method, oop receiver, int nofArgs, oop* args);  // see interpreter_asm.asm

oop Delta::call_generic(DeltaCallCache* ic, oop receiver, oop selector, int nofArgs, oop* args) {
  if (ic->match(receiver->klass(), symbolOop(selector))) {
    // use ic entry - but first make sure it's not a zombie nmethod
    jumpTableEntry* entry = ic->result().entry();
    if (entry != NULL && entry->method()->isZombie()) {
      // is a zombie nmethod => do a new lookup
      LookupResult result = ic->lookup(receiver->klass(), symbolOop(selector));
      if (result.is_empty()) fatal("lookup failure - not treated");
      return call_delta(result.value(), receiver, nofArgs, args);
    }
    return call_delta(ic->result().value(), receiver, nofArgs, args);
  }

  if (!selector->is_symbol())
    return markSymbol(vmSymbols::second_argument_has_wrong_type());

  LookupResult result = ic->lookup(receiver->klass(), symbolOop(selector));
  if (result.is_empty()) fatal("lookup failure - not treated");
  return call_delta(result.value(), receiver, nofArgs, args);
}

oop Delta::call(oop receiver, oop selector) {
  static DeltaCallCache cache;
  return call_generic(&cache, receiver, selector, 0, NULL);
}

oop Delta::call(oop receiver, oop selector, oop arg1) {
  static DeltaCallCache cache;
  return call_generic(&cache, receiver, selector, 1, &arg1);
}

oop Delta::call(oop receiver, oop selector, oop arg1, oop arg2) {
  static DeltaCallCache cache;
  return call_generic(&cache, receiver, selector, 2, &arg1);
}

oop Delta::call(oop receiver, oop selector, oop arg1, oop arg2, oop arg3) {
  static DeltaCallCache cache;
  return call_generic(&cache, receiver, selector, 3, &arg1);
}

oop Delta::call(oop receiver, oop selector, objArrayOop args) {
  static DeltaCallCache cache;
  return call_generic(&cache, receiver, selector, args->length(), args->objs(1));
}

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