/*
* Copyright 2000-2004 The Apache Software Foundation
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*
*/
/* Generated By:JJTree: Do not edit this line. ASTIdent.java */
/* JJT: 0.3pre1 */
package Mini;
import org.apache.bcel.generic.ConstantPoolGen;
import org.apache.bcel.generic.ILOAD;
import org.apache.bcel.generic.InstructionList;
import org.apache.bcel.generic.LocalVariableGen;
import org.apache.bcel.generic.MethodGen;
import org.apache.bcel.generic.PUSH;
/**
*
* @version $Id: ASTIdent.java 410087 2006-05-29 12:12:19Z tcurdt $
* @author <A HREF="mailto:m.dahm@gmx.de">M. Dahm</A>
*/
public class ASTIdent extends ASTExpr implements org.apache.bcel.Constants {
private String name;
private Variable reference; // Reference in environment to decl of this ident
// Generated methods
ASTIdent(int id) {
super(id);
}
ASTIdent(MiniParser p, int id) {
super(p, id);
}
public static Node jjtCreate(MiniParser p, int id) {
return new ASTIdent(p, id);
}
public ASTIdent(String name, int type, int line, int column) {
super(line, column, JJTIDENT);
this.name = name;
this.type = type;
}
// closeNode, dump inherited
/**
* @return identifier and line/column number of appearance
*/
public String toString() {
return super.toString() + " = " + name;
}
/**
* Overrides ASTExpr.traverse()
*/
public ASTExpr traverse(Environment env) {
EnvEntry entry = env.get(name);
if(entry == null) {
MiniC.addError(line, column, "Undeclared identifier " + name);
} else if(entry instanceof Function) {
MiniC.addError(line, column,
"Function " + name + " used as an identifier.");
} else {
reference = (Variable)entry;
}
return this; // Nothing to reduce/traverse further here
}
/**
* Overrides AstExpr.eval()
*/
public int eval(int expected) {
ASTIdent ident = reference.getName();
int t = ident.getType();
is_simple = true; // (Very) simple expression, always true
if((t == T_UNKNOWN) && (expected == T_UNKNOWN)) {
type = T_UNKNOWN;
} else if((t == T_UNKNOWN) && (expected != T_UNKNOWN)) {
ident.setType(expected);
type = expected;
}
else if((t != T_UNKNOWN) && (expected == T_UNKNOWN)) {
ident.setType(t);
type = t;
} else {
type = t; // Caller has to check for an error, i.e. t != expected
}
return type;
}
/**
* Fourth pass, produce Java code.
*/
public void code(StringBuffer buf) {
if(name.equals("TRUE")) {
ASTFunDecl.push(buf, "1");
} else if(name.equals("FALSE")) {
ASTFunDecl.push(buf, "0");
} else {
ASTFunDecl.push(buf, name);
}
}
/**
* Fifth pass, produce Java byte code.
*/
public void byte_code(InstructionList il, MethodGen method, ConstantPoolGen cp) {
if(name.equals("TRUE")) {
il.append(new PUSH(cp, 1));
} else if(name.equals("FALSE")) {
il.append(new PUSH(cp, 0));
} else {
LocalVariableGen local_var = reference.getLocalVariable();
il.append(new ILOAD(local_var.getIndex()));
}
ASTFunDecl.push();
}
public void setName(String name) { this.name = name; }
public String getName() { return name; }
}