alvinalexander.com | career | drupal | java | mac | mysql | perl | scala | uml | unix  

Java example source code file (sharkConstant.cpp)

This example Java source code file (sharkConstant.cpp) is included in the alvinalexander.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Learn more about this Java project at its project page.

Java - Java tags/keywords

null, sharkconstant, sharkconstant\:\:for_ldc, sharkconstant\:\:sharkconstant, sharkvalue, shouldnotreachhere, t_array, t_boolean, t_char, t_double, t_float, t_long, t_object, t_short

The sharkConstant.cpp Java example source code

/*
 * Copyright (c) 1999, 2013, Oracle and/or its affiliates. All rights reserved.
 * Copyright 2009 Red Hat, Inc.
 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
 *
 * This code is free software; you can redistribute it and/or modify it
 * under the terms of the GNU General Public License version 2 only, as
 * published by the Free Software Foundation.
 *
 * This code is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
 * version 2 for more details (a copy is included in the LICENSE file that
 * accompanied this code).
 *
 * You should have received a copy of the GNU General Public License version
 * 2 along with this work; if not, write to the Free Software Foundation,
 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 *
 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
 * or visit www.oracle.com if you need additional information or have any
 * questions.
 *
 */

#include "precompiled.hpp"
#include "ci/ciInstance.hpp"
#include "ci/ciStreams.hpp"
#include "shark/sharkBuilder.hpp"
#include "shark/sharkConstant.hpp"
#include "shark/sharkValue.hpp"

using namespace llvm;

SharkConstant* SharkConstant::for_ldc(ciBytecodeStream *iter) {
  ciConstant constant = iter->get_constant();
  ciType *type = NULL;
  if (constant.basic_type() == T_OBJECT) {
    ciEnv *env = ciEnv::current();

    assert(constant.as_object()->klass() == env->String_klass()
           || constant.as_object()->klass() == env->Class_klass()
           || constant.as_object()->klass()->is_subtype_of(env->MethodType_klass())
           || constant.as_object()->klass()->is_subtype_of(env->MethodHandle_klass()), "should be");

    type = constant.as_object()->klass();
  }
  return new SharkConstant(constant, type);
}

SharkConstant* SharkConstant::for_field(ciBytecodeStream *iter) {
  bool will_link;
  ciField *field = iter->get_field(will_link);
  assert(will_link, "typeflow responsibility");

  return new SharkConstant(field->constant_value(), field->type());
}

SharkConstant::SharkConstant(ciConstant constant, ciType *type) {
  SharkValue *value = NULL;

  switch (constant.basic_type()) {
  case T_BOOLEAN:
  case T_BYTE:
  case T_CHAR:
  case T_SHORT:
  case T_INT:
    value = SharkValue::jint_constant(constant.as_int());
    break;

  case T_LONG:
    value = SharkValue::jlong_constant(constant.as_long());
    break;

  case T_FLOAT:
    value = SharkValue::jfloat_constant(constant.as_float());
    break;

  case T_DOUBLE:
    value = SharkValue::jdouble_constant(constant.as_double());
    break;

  case T_OBJECT:
  case T_ARRAY:
    break;

  case T_ILLEGAL:
    // out of memory
    _is_loaded = false;
    return;

  default:
    tty->print_cr("Unhandled type %s", type2name(constant.basic_type()));
    ShouldNotReachHere();
  }

  // Handle primitive types.  We create SharkValues for these
  // now; doing so doesn't emit any code, and it allows us to
  // delegate a bunch of stuff to the SharkValue code.
  if (value) {
    _value       = value;
    _is_loaded   = true;
    _is_nonzero  = value->zero_checked();
    _is_two_word = value->is_two_word();
    return;
  }

  // Handle reference types.  This is tricky because some
  // ciObjects are psuedo-objects that refer to oops which
  // have yet to be created.  We need to spot the unloaded
  // objects (which differ between ldc* and get*, thanks!)
  ciObject *object = constant.as_object();
  assert(type != NULL, "shouldn't be");

  if ((! object->is_null_object()) && object->klass() == ciEnv::current()->Class_klass()) {
    ciKlass *klass = object->klass();
    if (! klass->is_loaded()) {
      _is_loaded = false;
      return;
    }
  }

  if (object->is_null_object() || ! object->can_be_constant() || ! object->is_loaded()) {
    _is_loaded = false;
    return;
  }

  _value       = NULL;
  _object      = object;
  _type        = type;
  _is_loaded   = true;
  _is_nonzero  = true;
  _is_two_word = false;
}

Other Java examples (source code examples)

Here is a short list of links related to this Java sharkConstant.cpp source code file:

... this post is sponsored by my books ...

#1 New Release!

FP Best Seller

 

new blog posts

 

Copyright 1998-2021 Alvin Alexander, alvinalexander.com
All Rights Reserved.

A percentage of advertising revenue from
pages under the /java/jwarehouse URI on this website is
paid back to open source projects.