/* | |
* Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. | |
* 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. Oracle designates this | |
* particular file as subject to the "Classpath" exception as provided | |
* by Oracle in the LICENSE file that accompanied this code. | |
* | |
* 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 | |
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* questions. | |
*/ | |
package sun.tools.tree; | |
import sun.tools.java.*; | |
import java.io.PrintStream; | |
import java.util.Hashtable; | |
/** | |
* WARNING: The contents of this source file are not part of any | |
* supported API. Code that depends on them does so at its own risk: | |
* they are subject to change or removal without notice. | |
*/ | |
public | |
class UnaryExpression extends Expression { | |
Expression right; | |
/** | |
* Constructor | |
*/ | |
UnaryExpression(int op, long where, Type type, Expression right) { | |
super(op, where, type); | |
this.right = right; | |
} | |
/** | |
* Order the expression based on precedence | |
*/ | |
public Expression order() { | |
if (precedence() > right.precedence()) { | |
UnaryExpression e = (UnaryExpression)right; | |
right = e.right; | |
e.right = order(); | |
return e; | |
} | |
return this; | |
} | |
/** | |
* Select the type of the expression | |
*/ | |
void selectType(Environment env, Context ctx, int tm) { | |
throw new CompilerError("selectType: " + opNames[op]); | |
} | |
/** | |
* Check a unary expression | |
*/ | |
public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp) { | |
vset = right.checkValue(env, ctx, vset, exp); | |
int tm = right.type.getTypeMask(); | |
selectType(env, ctx, tm); | |
if (((tm & TM_ERROR) == 0) && type.isType(TC_ERROR)) { | |
env.error(where, "invalid.arg", opNames[op]); | |
} | |
return vset; | |
} | |
/** | |
* Check if constant | |
*/ | |
public boolean isConstant() { | |
switch (op) { | |
case POS: | |
case NEG: | |
case BITNOT: | |
case NOT: | |
case EXPR: | |
case CONVERT: // generated inside of CastExpression | |
return right.isConstant(); | |
} | |
return false; | |
} | |
/** | |
* Evaluate | |
*/ | |
Expression eval(int a) { | |
return this; | |
} | |
Expression eval(long a) { | |
return this; | |
} | |
Expression eval(float a) { | |
return this; | |
} | |
Expression eval(double a) { | |
return this; | |
} | |
Expression eval(boolean a) { | |
return this; | |
} | |
Expression eval(String a) { | |
return this; | |
} | |
Expression eval() { | |
switch (right.op) { | |
case BYTEVAL: | |
case CHARVAL: | |
case SHORTVAL: | |
case INTVAL: | |
return eval(((IntegerExpression)right).value); | |
case LONGVAL: | |
return eval(((LongExpression)right).value); | |
case FLOATVAL: | |
return eval(((FloatExpression)right).value); | |
case DOUBLEVAL: | |
return eval(((DoubleExpression)right).value); | |
case BOOLEANVAL: | |
return eval(((BooleanExpression)right).value); | |
case STRINGVAL: | |
return eval(((StringExpression)right).value); | |
} | |
return this; | |
} | |
/** | |
* Inline | |
*/ | |
public Expression inline(Environment env, Context ctx) { | |
return right.inline(env, ctx); | |
} | |
public Expression inlineValue(Environment env, Context ctx) { | |
right = right.inlineValue(env, ctx); | |
try { | |
return eval().simplify(); | |
} catch (ArithmeticException e) { | |
// Got rid of this error message. It isn't illegal to | |
// have a program which does a constant division by | |
// zero. We return `this' to make the compiler to | |
// generate code here. | |
// (bugs 4019304, 4089107). | |
// | |
// I am not positive that this catch is ever reached. | |
// | |
// env.error(where, "arithmetic.exception"); | |
return this; | |
} | |
} | |
/** | |
* Create a copy of the expression for method inlining | |
*/ | |
public Expression copyInline(Context ctx) { | |
UnaryExpression e = (UnaryExpression)clone(); | |
if (right != null) { | |
e.right = right.copyInline(ctx); | |
} | |
return e; | |
} | |
/** | |
* The cost of inlining this expression | |
*/ | |
public int costInline(int thresh, Environment env, Context ctx) { | |
return 1 + right.costInline(thresh, env, ctx); | |
} | |
/** | |
*/ | |
public void print(PrintStream out) { | |
out.print("(" + opNames[op] + " "); | |
right.print(out); | |
out.print(")"); | |
} | |
} |