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| 1 | /* | ||
| 2 | * Copyright (c) 1994, 2003, Oracle and/or its affiliates. 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.tools.tree; | ||
| 27 | |||
| 28 | import sun.tools.java.*; | ||
| 29 | import sun.tools.asm.Assembler; | ||
| 30 | import sun.tools.asm.Label; | ||
| 31 | import sun.tools.asm.SwitchData; | ||
| 32 | import java.io.PrintStream; | ||
| 33 | import java.util.Hashtable; | ||
| 34 | |||
| 35 | /** | ||
| 36 | * WARNING: The contents of this source file are not part of any | ||
| 37 | * supported API. Code that depends on them does so at its own risk: | ||
| 38 | * they are subject to change or removal without notice. | ||
| 39 | */ | ||
| 40 | public | ||
| 41 | class SwitchStatement extends Statement { | ||
| 42 | Expression expr; | ||
| 43 | Statement args[]; | ||
| 44 | |||
| 45 | /** | ||
| 46 | * Constructor | ||
| 47 | */ | ||
| 48 | public SwitchStatement(long where, Expression expr, Statement args[]) { | ||
| 49 | super(SWITCH, where); | ||
| 50 | this.expr = expr; | ||
| 51 | this.args = args; | ||
| 52 | } | ||
| 53 | |||
| 54 | /** | ||
| 55 | * Check statement | ||
| 56 | */ | ||
| 57 | Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) { | ||
| 58 | checkLabel(env, ctx); | ||
| 59 | CheckContext newctx = new CheckContext(ctx, this); | ||
| 60 | vset = expr.checkValue(env, newctx, reach(env, vset), exp); | ||
| 61 | Type switchType = expr.type; | ||
| 62 | |||
| 63 | expr = convert(env, newctx, Type.tInt, expr); | ||
| 64 | |||
| 65 | Hashtable tab = new Hashtable(); | ||
| 66 | boolean hasDefault = false; | ||
| 67 | // Note that vs is reset to vset.copy() on every case label. | ||
| 68 | // If the first substatement is not a case label, it is unreached. | ||
| 69 | Vset vs = DEAD_END; | ||
| 70 | |||
| 71 | for (int i = 0 ; i < args.length ; i++) { | ||
| 72 | Statement s = args[i]; | ||
| 73 | |||
| 74 | if (s.op == CASE) { | ||
| 75 | |||
| 76 | vs = s.check(env, newctx, vs.join(vset.copy()), exp); | ||
| 77 | |||
| 78 | Expression lbl = ((CaseStatement)s).expr; | ||
| 79 | if (lbl != null) { | ||
| 80 | if (lbl instanceof IntegerExpression) { | ||
| 81 | Integer Ivalue = | ||
| 82 | (Integer)(((IntegerExpression)lbl).getValue()); | ||
| 83 | int ivalue = Ivalue.intValue(); | ||
| 84 | if (tab.get(lbl) != null) { | ||
| 85 | env.error(s.where, "duplicate.label", Ivalue); | ||
| 86 | } else { | ||
| 87 | tab.put(lbl, s); | ||
| 88 | boolean overflow; | ||
| 89 | switch (switchType.getTypeCode()) { | ||
| 90 | case TC_BYTE: | ||
| 91 | overflow = (ivalue != (byte)ivalue); break; | ||
| 92 | case TC_SHORT: | ||
| 93 | overflow = (ivalue != (short)ivalue); break; | ||
| 94 | case TC_CHAR: | ||
| 95 | overflow = (ivalue != (char)ivalue); break; | ||
| 96 | default: | ||
| 97 | overflow = false; | ||
| 98 | } | ||
| 99 | if (overflow) { | ||
| 100 | env.error(s.where, "switch.overflow", | ||
| 101 | Ivalue, switchType); | ||
| 102 | } | ||
| 103 | } | ||
| 104 | } else { | ||
| 105 | // Suppose a class got an error early on during | ||
| 106 | // checking. It will set all of its members to | ||
| 107 | // have the status "ERROR". Now suppose that a | ||
| 108 | // case label refers to one of this class's | ||
| 109 | // fields. When we check the case label, the | ||
| 110 | // compiler will try to inline the FieldExpression. | ||
| 111 | // Since the expression has ERROR status, it doesn't | ||
| 112 | // inline. This means that instead of the case | ||
| 113 | // label being an IntegerExpression, it will still | ||
| 114 | // be a FieldExpression, and we will end up in this | ||
| 115 | // else block. So, before we just assume that | ||
| 116 | // the expression isn't constant, do a check to | ||
| 117 | // see if it was constant but unable to inline. | ||
| 118 | // This eliminates some spurious error messages. | ||
| 119 | // (Bug id 4067498). | ||
| 120 | if (!lbl.isConstant() || | ||
| 121 | lbl.getType() != Type.tInt) { | ||
| 122 | env.error(s.where, "const.expr.required"); | ||
| 123 | } | ||
| 124 | } | ||
| 125 | } else { | ||
| 126 | if (hasDefault) { | ||
| 127 | env.error(s.where, "duplicate.default"); | ||
| 128 | } | ||
| 129 | hasDefault = true; | ||
| 130 | } | ||
| 131 | } else { | ||
| 132 | vs = s.checkBlockStatement(env, newctx, vs, exp); | ||
| 133 | } | ||
| 134 | } | ||
| 135 | if (!vs.isDeadEnd()) { | ||
| 136 | newctx.vsBreak = newctx.vsBreak.join(vs); | ||
| 137 | } | ||
| 138 | if (hasDefault) | ||
| 139 | vset = newctx.vsBreak; | ||
| 140 | return ctx.removeAdditionalVars(vset); | ||
| 141 | } | ||
| 142 | |||
| 143 | /** | ||
| 144 | * Inline | ||
| 145 | */ | ||
| 146 | public Statement inline(Environment env, Context ctx) { | ||
| 147 | ctx = new Context(ctx, this); | ||
| 148 | expr = expr.inlineValue(env, ctx); | ||
| 149 | for (int i = 0 ; i < args.length ; i++) { | ||
| 150 | if (args[i] != null) { | ||
| 151 | args[i] = args[i].inline(env, ctx); | ||
| 152 | } | ||
| 153 | } | ||
| 154 | return this; | ||
| 155 | } | ||
| 156 | |||
| 157 | /** | ||
| 158 | * Create a copy of the statement for method inlining | ||
| 159 | */ | ||
| 160 | public Statement copyInline(Context ctx, boolean valNeeded) { | ||
| 161 | SwitchStatement s = (SwitchStatement)clone(); | ||
| 162 | s.expr = expr.copyInline(ctx); | ||
| 163 | s.args = new Statement[args.length]; | ||
| 164 | for (int i = 0 ; i < args.length ; i++) { | ||
| 165 | if (args[i] != null) { | ||
| 166 | s.args[i] = args[i].copyInline(ctx, valNeeded); | ||
| 167 | } | ||
| 168 | } | ||
| 169 | return s; | ||
| 170 | } | ||
| 171 | |||
| 172 | /** | ||
| 173 | * The cost of inlining this statement | ||
| 174 | */ | ||
| 175 | public int costInline(int thresh, Environment env, Context ctx) { | ||
| 176 | int cost = expr.costInline(thresh, env, ctx); | ||
| 177 | for (int i = 0 ; (i < args.length) && (cost < thresh) ; i++) { | ||
| 178 | if (args[i] != null) { | ||
| 179 | cost += args[i].costInline(thresh, env, ctx); | ||
| 180 | } | ||
| 181 | } | ||
| 182 | return cost; | ||
| 183 | } | ||
| 184 | |||
| 185 | /** | ||
| 186 | * Code | ||
| 187 | */ | ||
| 188 | public void code(Environment env, Context ctx, Assembler asm) { | ||
| 189 | CodeContext newctx = new CodeContext(ctx, this); | ||
| 190 | |||
| 191 | expr.codeValue(env, newctx, asm); | ||
| 192 | |||
| 193 | SwitchData sw = new SwitchData(); | ||
| 194 | boolean hasDefault = false; | ||
| 195 | |||
| 196 | for (int i = 0 ; i < args.length ; i++) { | ||
| 197 | Statement s = args[i]; | ||
| 198 | if ((s != null) && (s.op == CASE)) { | ||
| 199 | Expression e = ((CaseStatement)s).expr; | ||
| 200 | if (e != null) { | ||
| 201 | sw.add(((IntegerExpression)e).value, new Label()); | ||
| 202 | } | ||
| 203 | // JCOV | ||
| 204 | else { | ||
| 205 | hasDefault = true; | ||
| 206 | } | ||
| 207 | // end JCOV | ||
| 208 | } | ||
| 209 | } | ||
| 210 | |||
| 211 | // JCOV | ||
| 212 | if (env.coverage()) | ||
| 213 | sw.initTableCase(); | ||
| 214 | // end JCOV | ||
| 215 | asm.add(where, opc_tableswitch, sw); | ||
| 216 | |||
| 217 | for (int i = 0 ; i < args.length ; i++) { | ||
| 218 | Statement s = args[i]; | ||
| 219 | if (s != null) { | ||
| 220 | if (s.op == CASE) { | ||
| 221 | Expression e = ((CaseStatement)s).expr; | ||
| 222 | if (e != null) { | ||
| 223 | asm.add(sw.get(((IntegerExpression)e).value)); | ||
| 224 | // JCOV | ||
| 225 | sw.addTableCase(((IntegerExpression)e).value, s.where); | ||
| 226 | // end JCOV | ||
| 227 | } else { | ||
| 228 | asm.add(sw.getDefaultLabel()); | ||
| 229 | // JCOV | ||
| 230 | sw.addTableDefault(s.where); | ||
| 231 | // end JCOV | ||
| 232 | /* JCOV hasDefault = true; end JCOV */ | ||
| 233 | } | ||
| 234 | } else { | ||
| 235 | s.code(env, newctx, asm); | ||
| 236 | } | ||
| 237 | } | ||
| 238 | } | ||
| 239 | |||
| 240 | if (!hasDefault) { | ||
| 241 | asm.add(sw.getDefaultLabel()); | ||
| 242 | } | ||
| 243 | asm.add(newctx.breakLabel); | ||
| 244 | } | ||
| 245 | |||
| 246 | /** | ||
| 247 | |||
| 248 | */ | ||
| 249 | public void print(PrintStream out, int indent) { | ||
| 250 | super.print(out, indent); | ||
| 251 | out.print("switch ("); | ||
| 252 | expr.print(out); | ||
| 253 | out.print(") {\n"); | ||
| 254 | for (int i = 0 ; i < args.length ; i++) { | ||
| 255 | if (args[i] != null) { | ||
| 256 | printIndent(out, indent + 1); | ||
| 257 | args[i].print(out, indent + 1); | ||
| 258 | out.print("\n"); | ||
| 259 | } | ||
| 260 | } | ||
| 261 | printIndent(out, indent); | ||
| 262 | out.print("}"); | ||
| 263 | } | ||
| 264 | } | ||