77 lines
2.7 KiB
Java
77 lines
2.7 KiB
Java
/*
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Copyright (c) 2000 The Regents of the University of California.
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All rights reserved.
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Permission to use, copy, modify, and distribute this software for any
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purpose, without fee, and without written agreement is hereby granted,
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provided that the above copyright notice and the following two
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paragraphs appear in all copies of this software.
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IN NO EVENT SHALL THE UNIVERSITY OF CALIFORNIA BE LIABLE TO ANY PARTY FOR
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DIRECT, INDIRECT, SPECIAL, INCIDENTAL, OR CONSEQUENTIAL DAMAGES ARISING OUT
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OF THE USE OF THIS SOFTWARE AND ITS DOCUMENTATION, EVEN IF THE UNIVERSITY OF
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CALIFORNIA HAS BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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THE UNIVERSITY OF CALIFORNIA SPECIFICALLY DISCLAIMS ANY WARRANTIES,
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INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY
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AND FITNESS FOR A PARTICULAR PURPOSE. THE SOFTWARE PROVIDED HEREUNDER IS
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ON AN "AS IS" BASIS, AND THE UNIVERSITY OF CALIFORNIA HAS NO OBLIGATION TO
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PROVIDE MAINTENANCE, SUPPORT, UPDATES, ENHANCEMENTS, OR MODIFICATIONS.
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*/
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// This is a project skeleton file for PA5, but a regular support code
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// for other assignments.
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import java.io.PrintStream;
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/** String table entry for string constants. */
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class StringSymbol extends AbstractSymbol {
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/* Creates a new symbol.
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*
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* @see AbstractSymbol
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* */
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public StringSymbol(String str, int len, int index) {
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super(str, len, index);
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}
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/** Generates code for the string constant definition. This method
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* is incomplete; you get to finish it up in programming assignment
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* 5.
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* @param stringclasstag the class tag for string object
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* @param s the output stream
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*
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* */
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public void codeDef(int stringclasstag, PrintStream s) {
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IntSymbol lensym = (IntSymbol)AbstractTable.inttable.addInt(str.length());
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// Add -1 eye catcher
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s.println(CgenSupport.WORD + "-1");
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codeRef(s); s.print(CgenSupport.LABEL); // label
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s.println(CgenSupport.WORD + stringclasstag); // tag
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s.println(CgenSupport.WORD + (CgenSupport.DEFAULT_OBJFIELDS +
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CgenSupport.STRING_SLOTS +
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(str.length() + 4) / 4)); // object size
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s.print(CgenSupport.WORD);
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/* Add code to reference the dispatch table for class String here */
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s.println(""); // dispatch table
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s.print(CgenSupport.WORD); lensym.codeRef(s); s.println(""); // length
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CgenSupport.emitStringConstant(str, s); // ascii string
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s.print(CgenSupport.ALIGN); // align to word
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}
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/** Emits a reference to this string constant.
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* @param s the output stream
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* */
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public void codeRef(PrintStream s) {
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s.print(CgenSupport.STRCONST_PREFIX + index);
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}
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/** Returns a copy of this symbol */
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public Object clone() {
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return new StringSymbol(str, str.length(), index);
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}
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}
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