frame.c

This is a java virtual machine implement in c

/*0001*//*
/*0002./ * Copyright (c) 1998-2001 Sun Microsystems, Inc. All Rights Reserved.
/*0003./ *
/*0004./ * This software is the confidential and proprietary information of Sun
/*0005./ * Microsystems, Inc. ("Confidential Information").  You shall not
/*0006./ * disclose such Confidential Information and shall use it only in
/*0007./ * accordance with the terms of the license agreement you entered into
/*0008./ * with Sun.
/*0009./ *
/*0010./ * SUN MAKES NO REPRESENTATIONS OR WARRANTIES ABOUT THE SUITABILITY OF THE
/*0011./ * SOFTWARE, EITHER EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE
/*0012./ * IMPLIED WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR
/*0013./ * PURPOSE, OR NON-INFRINGEMENT. SUN SHALL NOT BE LIABLE FOR ANY DAMAGES
/*0014./ * SUFFERED BY LICENSEE AS A RESULT OF USING, MODIFYING OR DISTRIBUTING
/*0015./ * THIS SOFTWARE OR ITS DERIVATIVES.
/*0016./ *
/*0017./ */
/*0018*/
/*0019*//*=========================================================================
/*0020./ * SYSTEM:    KVM
/*0021./ * SUBSYSTEM: Interpreter stack frames
/*0022./ * FILE:      frame.c
/*0023./ * OVERVIEW:  This file defines the internal operations for
/*0024./ *            manipulating stack frames & performing exception
/*0025./ *            handling.
/*0026./ * AUTHOR:    Antero Taivalsaari, Sun Labs
/*0027./ *            Edited by Doug Simon 11/1998 (simplified exception handling)
/*0028./ *            Sheng Liang (chunky stacks), Frank Yellin
/*0029./ *=======================================================================*/
/*0030*/
/*0031*//*=========================================================================
/*0032./ * Include files
/*0033./ *=======================================================================*/
/*0034*/
/*0035*/#include <global.h>
/*0036*/
/*0037*//*=========================================================================
/*0038./ * Global variables and definitions
/*0039./ *=======================================================================*/
/*0040*/
/*0041*//* Shortcuts to the errors/exceptions that the VM may throw */
/*0042*/
/*0043*/const char NullPointerException[]
/*0044*/           = "java/lang/NullPointerException";
/*0045*/const char IndexOutOfBoundsException[]
/*0046*/           = "java/lang/IndexOutOfBoundsException";
/*0047*/const char ArrayIndexOutOfBoundsException[]
/*0048*/           = "java/lang/ArrayIndexOutOfBoundsException";
/*0049*/const char ArrayStoreException[]
/*0050*/           = "java/lang/ArrayStoreException";
/*0051*/const char ArithmeticException[]
/*0052*/           = "java/lang/ArithmeticException";
/*0053*/const char ClassCastException[]
/*0054*/           = "java/lang/ClassCastException";
/*0055*/const char NegativeArraySizeException[]
/*0056*/           = "java/lang/NegativeArraySizeException";
/*0057*/
/*0181*//*=========================================================================
/*0182./ * Operations on stack frames
/*0183./ *=======================================================================*/
/*0184*/
/*0185*//*=========================================================================
/*0186./ * FUNCTION:      pushFrame()
/*0187./ * TYPE:          constructor (kind of)
/*0188./ * OVERVIEW:      Creates a new execution stack frame for the currently
/*0189./ *                executing thread. The operation is used for invoking
/*0190./ *                methods upon message sending to objects.
/*0191./ * INTERFACE:
/*0192./ *   parameters:  method pointer
/*0193./ *   returns:     TRUE if pushFrame succeeds;
/*0194./ *                FALSE on stack overflow (it will have raised the exception)
/*0195./ *
/*0196./ * COMMENTS:      Note: this function operates in the context of
/*0197./ *                currently executing thread. All VM registers must
/*0198./ *                be initialized correctly before allocating frames.
/*0199./ *
/*0200./ *                Remember that the zeroeth local variable '*lp'
/*0201./ *                must contain the 'this' (self) pointer
/*0202./ *                in virtual/special/interface function calls.
/*0203./ *=======================================================================*/
/*0204*/
/*0205*/bool_t pushFrame(METHOD thisMethod)
/*0206*/{
/*0207*/    int thisFrameSize = thisMethod->frameSize; //\\