J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1994-2003 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun in the LICENSE file that accompanied this code. |
| 10 | * |
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 14 | * version 2 for more details (a copy is included in the LICENSE file that |
| 15 | * accompanied this code). |
| 16 | * |
| 17 | * You should have received a copy of the GNU General Public License version |
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 20 | * |
| 21 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any questions. |
| 24 | */ |
| 25 | |
| 26 | package sun.tools.tree; |
| 27 | |
| 28 | import sun.tools.java.*; |
| 29 | import sun.tools.asm.Label; |
| 30 | import sun.tools.asm.Assembler; |
| 31 | import java.io.PrintStream; |
| 32 | import java.util.Hashtable; |
| 33 | |
| 34 | /** |
| 35 | * WARNING: The contents of this source file are not part of any |
| 36 | * supported API. Code that depends on them does so at its own risk: |
| 37 | * they are subject to change or removal without notice. |
| 38 | */ |
| 39 | public |
| 40 | class BinaryExpression extends UnaryExpression { |
| 41 | Expression left; |
| 42 | |
| 43 | /** |
| 44 | * Constructor |
| 45 | */ |
| 46 | BinaryExpression(int op, long where, Type type, Expression left, Expression right) { |
| 47 | super(op, where, type, right); |
| 48 | this.left = left; |
| 49 | } |
| 50 | |
| 51 | /** |
| 52 | * Order the expression based on precedence |
| 53 | */ |
| 54 | public Expression order() { |
| 55 | if (precedence() > left.precedence()) { |
| 56 | UnaryExpression e = (UnaryExpression)left; |
| 57 | left = e.right; |
| 58 | e.right = order(); |
| 59 | return e; |
| 60 | } |
| 61 | return this; |
| 62 | } |
| 63 | |
| 64 | /** |
| 65 | * Check a binary expression |
| 66 | */ |
| 67 | public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) { |
| 68 | vset = left.checkValue(env, ctx, vset, exp); |
| 69 | vset = right.checkValue(env, ctx, vset, exp); |
| 70 | |
| 71 | int tm = left.type.getTypeMask() | right.type.getTypeMask(); |
| 72 | if ((tm & TM_ERROR) != 0) { |
| 73 | return vset; |
| 74 | } |
| 75 | selectType(env, ctx, tm); |
| 76 | |
| 77 | if (type.isType(TC_ERROR)) { |
| 78 | env.error(where, "invalid.args", opNames[op]); |
| 79 | } |
| 80 | return vset; |
| 81 | } |
| 82 | |
| 83 | /** |
| 84 | * Check if constant |
| 85 | */ |
| 86 | public boolean isConstant() { |
| 87 | switch (op) { |
| 88 | case MUL: |
| 89 | case DIV: |
| 90 | case REM: |
| 91 | case ADD: |
| 92 | case SUB: |
| 93 | case LSHIFT: |
| 94 | case RSHIFT: |
| 95 | case URSHIFT: |
| 96 | case LT: |
| 97 | case LE: |
| 98 | case GT: |
| 99 | case GE: |
| 100 | case EQ: |
| 101 | case NE: |
| 102 | case BITAND: |
| 103 | case BITXOR: |
| 104 | case BITOR: |
| 105 | case AND: |
| 106 | case OR: |
| 107 | return left.isConstant() && right.isConstant(); |
| 108 | } |
| 109 | return false; |
| 110 | } |
| 111 | /** |
| 112 | * Evaluate |
| 113 | */ |
| 114 | Expression eval(int a, int b) { |
| 115 | return this; |
| 116 | } |
| 117 | Expression eval(long a, long b) { |
| 118 | return this; |
| 119 | } |
| 120 | Expression eval(float a, float b) { |
| 121 | return this; |
| 122 | } |
| 123 | Expression eval(double a, double b) { |
| 124 | return this; |
| 125 | } |
| 126 | Expression eval(boolean a, boolean b) { |
| 127 | return this; |
| 128 | } |
| 129 | Expression eval(String a, String b) { |
| 130 | return this; |
| 131 | } |
| 132 | Expression eval() { |
| 133 | // See also the eval() code in BinaryShiftExpression.java. |
| 134 | if (left.op == right.op) { |
| 135 | switch (left.op) { |
| 136 | case BYTEVAL: |
| 137 | case CHARVAL: |
| 138 | case SHORTVAL: |
| 139 | case INTVAL: |
| 140 | return eval(((IntegerExpression)left).value, ((IntegerExpression)right).value); |
| 141 | case LONGVAL: |
| 142 | return eval(((LongExpression)left).value, ((LongExpression)right).value); |
| 143 | case FLOATVAL: |
| 144 | return eval(((FloatExpression)left).value, ((FloatExpression)right).value); |
| 145 | case DOUBLEVAL: |
| 146 | return eval(((DoubleExpression)left).value, ((DoubleExpression)right).value); |
| 147 | case BOOLEANVAL: |
| 148 | return eval(((BooleanExpression)left).value, ((BooleanExpression)right).value); |
| 149 | case STRINGVAL: |
| 150 | return eval(((StringExpression)left).value, ((StringExpression)right).value); |
| 151 | } |
| 152 | } |
| 153 | return this; |
| 154 | } |
| 155 | |
| 156 | /** |
| 157 | * Inline |
| 158 | */ |
| 159 | public Expression inline(Environment env, Context ctx) { |
| 160 | left = left.inline(env, ctx); |
| 161 | right = right.inline(env, ctx); |
| 162 | return (left == null) ? right : new CommaExpression(where, left, right); |
| 163 | } |
| 164 | public Expression inlineValue(Environment env, Context ctx) { |
| 165 | left = left.inlineValue(env, ctx); |
| 166 | right = right.inlineValue(env, ctx); |
| 167 | try { |
| 168 | return eval().simplify(); |
| 169 | } catch (ArithmeticException e) { |
| 170 | // Got rid of this error message. It isn't illegal to |
| 171 | // have a program which does a constant division by |
| 172 | // zero. We return `this' to make the compiler to |
| 173 | // generate code here. |
| 174 | // (bugs 4019304, 4089107). |
| 175 | // |
| 176 | // env.error(where, "arithmetic.exception"); |
| 177 | return this; |
| 178 | } |
| 179 | } |
| 180 | |
| 181 | /** |
| 182 | * Create a copy of the expression for method inlining |
| 183 | */ |
| 184 | public Expression copyInline(Context ctx) { |
| 185 | BinaryExpression e = (BinaryExpression)clone(); |
| 186 | if (left != null) { |
| 187 | e.left = left.copyInline(ctx); |
| 188 | } |
| 189 | if (right != null) { |
| 190 | e.right = right.copyInline(ctx); |
| 191 | } |
| 192 | return e; |
| 193 | } |
| 194 | |
| 195 | /** |
| 196 | * The cost of inlining this expression |
| 197 | */ |
| 198 | public int costInline(int thresh, Environment env, Context ctx) { |
| 199 | return 1 + ((left != null) ? left.costInline(thresh, env, ctx) : 0) + |
| 200 | ((right != null) ? right.costInline(thresh, env, ctx) : 0); |
| 201 | } |
| 202 | |
| 203 | /** |
| 204 | * Code |
| 205 | */ |
| 206 | void codeOperation(Environment env, Context ctx, Assembler asm) { |
| 207 | throw new CompilerError("codeOperation: " + opNames[op]); |
| 208 | } |
| 209 | public void codeValue(Environment env, Context ctx, Assembler asm) { |
| 210 | if (type.isType(TC_BOOLEAN)) { |
| 211 | Label l1 = new Label(); |
| 212 | Label l2 = new Label(); |
| 213 | |
| 214 | codeBranch(env, ctx, asm, l1, true); |
| 215 | asm.add(true, where, opc_ldc, new Integer(0)); |
| 216 | asm.add(true, where, opc_goto, l2); |
| 217 | asm.add(l1); |
| 218 | asm.add(true, where, opc_ldc, new Integer(1)); |
| 219 | asm.add(l2); |
| 220 | } else { |
| 221 | left.codeValue(env, ctx, asm); |
| 222 | right.codeValue(env, ctx, asm); |
| 223 | codeOperation(env, ctx, asm); |
| 224 | } |
| 225 | } |
| 226 | |
| 227 | /** |
| 228 | * Print |
| 229 | */ |
| 230 | public void print(PrintStream out) { |
| 231 | out.print("(" + opNames[op] + " "); |
| 232 | if (left != null) { |
| 233 | left.print(out); |
| 234 | } else { |
| 235 | out.print("<null>"); |
| 236 | } |
| 237 | out.print(" "); |
| 238 | if (right != null) { |
| 239 | right.print(out); |
| 240 | } else { |
| 241 | out.print("<null>"); |
| 242 | } |
| 243 | out.print(")"); |
| 244 | } |
| 245 | } |