/*
* 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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*/
package sun.tools.tree;
import sun.tools.java.*;
import sun.tools.asm.Label;
import sun.tools.asm.Assembler;
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 BinaryExpression extends UnaryExpression {
Expression left;
/**
* Constructor
*/
BinaryExpression(int op, long where, Type type, Expression left, Expression right) {
super(op, where, type, right);
this.left = left;
}
/**
* Order the expression based on precedence
*/
public Expression order() {
if (precedence() > left.precedence()) {
UnaryExpression e = (UnaryExpression)left;
left = e.right;
e.right = order();
return e;
}
return this;
}
/**
* Check a binary expression
*/
public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) {
vset = left.checkValue(env, ctx, vset, exp);
vset = right.checkValue(env, ctx, vset, exp);
int tm = left.type.getTypeMask() | right.type.getTypeMask();
if ((tm & TM_ERROR) != 0) {
return vset;
}
selectType(env, ctx, tm);
if (type.isType(TC_ERROR)) {
env.error(where, "invalid.args", opNames[op]);
}
return vset;
}
/**
* Check if constant
*/
public boolean isConstant() {
switch (op) {
case MUL:
case DIV:
case REM:
case ADD:
case SUB:
case LSHIFT:
case RSHIFT:
case URSHIFT:
case LT:
case LE:
case GT:
case GE:
case EQ:
case NE:
case BITAND:
case BITXOR:
case BITOR:
case AND:
case OR:
return left.isConstant() && right.isConstant();
}
return false;
}
/**
* Evaluate
*/
Expression eval(int a, int b) {
return this;
}
Expression eval(long a, long b) {
return this;
}
Expression eval(float a, float b) {
return this;
}
Expression eval(double a, double b) {
return this;
}
Expression eval(boolean a, boolean b) {
return this;
}
Expression eval(String a, String b) {
return this;
}
Expression eval() {
// See also the eval() code in BinaryShiftExpression.java.
if (left.op == right.op) {
switch (left.op) {
case BYTEVAL:
case CHARVAL:
case SHORTVAL:
case INTVAL:
return eval(((IntegerExpression)left).value, ((IntegerExpression)right).value);
case LONGVAL:
return eval(((LongExpression)left).value, ((LongExpression)right).value);
case FLOATVAL:
return eval(((FloatExpression)left).value, ((FloatExpression)right).value);
case DOUBLEVAL:
return eval(((DoubleExpression)left).value, ((DoubleExpression)right).value);
case BOOLEANVAL:
return eval(((BooleanExpression)left).value, ((BooleanExpression)right).value);
case STRINGVAL:
return eval(((StringExpression)left).value, ((StringExpression)right).value);
}
}
return this;
}
/**
* Inline
*/
public Expression inline(Environment env, Context ctx) {
left = left.inline(env, ctx);
right = right.inline(env, ctx);
return (left == null) ? right : new CommaExpression(where, left, right);
}
public Expression inlineValue(Environment env, Context ctx) {
left = left.inlineValue(env, 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).
//
// env.error(where, "arithmetic.exception");
return this;
}
}
/**
* Create a copy of the expression for method inlining
*/
public Expression copyInline(Context ctx) {
BinaryExpression e = (BinaryExpression)clone();
if (left != null) {
e.left = left.copyInline(ctx);
}
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 + ((left != null) ? left.costInline(thresh, env, ctx) : 0) +
((right != null) ? right.costInline(thresh, env, ctx) : 0);
}
/**
* Code
*/
void codeOperation(Environment env, Context ctx, Assembler asm) {
throw new CompilerError("codeOperation: " + opNames[op]);
}
public void codeValue(Environment env, Context ctx, Assembler asm) {
if (type.isType(TC_BOOLEAN)) {
Label l1 = new Label();
Label l2 = new Label();
codeBranch(env, ctx, asm, l1, true);
asm.add(true, where, opc_ldc, new Integer(0));
asm.add(true, where, opc_goto, l2);
asm.add(l1);
asm.add(true, where, opc_ldc, new Integer(1));
asm.add(l2);
} else {
left.codeValue(env, ctx, asm);
right.codeValue(env, ctx, asm);
codeOperation(env, ctx, asm);
}
}
/**
* Print
*/
public void print(PrintStream out) {
out.print("(" + opNames[op] + " ");
if (left != null) {
left.print(out);
} else {
out.print("<null>");
}
out.print(" ");
if (right != null) {
right.print(out);
} else {
out.print("<null>");
}
out.print(")");
}
}