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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.LocalVariable; | ||
| 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 VarDeclarationStatement extends Statement { | ||
| 41 | LocalMember field; | ||
| 42 | Expression expr; | ||
| 43 | |||
| 44 | /** | ||
| 45 | * Constructor | ||
| 46 | */ | ||
| 47 | public VarDeclarationStatement(long where, Expression expr) { | ||
| 48 | super(VARDECLARATION, where); | ||
| 49 | this.expr = expr; | ||
| 50 | } | ||
| 51 | public VarDeclarationStatement(long where, LocalMember field, Expression expr) { | ||
| 52 | super(VARDECLARATION, where); | ||
| 53 | this.field = field; | ||
| 54 | this.expr = expr; | ||
| 55 | } | ||
| 56 | |||
| 57 | /** | ||
| 58 | * Check statement | ||
| 59 | */ | ||
| 60 | Vset checkDeclaration(Environment env, Context ctx, Vset vset, int mod, Type t, Hashtable exp) { | ||
| 61 | if (labels != null) { | ||
| 62 | env.error(where, "declaration.with.label", labels[0]); | ||
| 63 | } | ||
| 64 | if (field != null) { | ||
| 65 | if (ctx.getLocalClass(field.getName()) != null | ||
| 66 | && field.isInnerClass()) { | ||
| 67 | env.error(where, "local.class.redefined", field.getName()); | ||
| 68 | } | ||
| 69 | |||
| 70 | ctx.declare(env, field); | ||
| 71 | if (field.isInnerClass()) { | ||
| 72 | ClassDefinition body = field.getInnerClass(); | ||
| 73 | try { | ||
| 74 | vset = body.checkLocalClass(env, ctx, vset, | ||
| 75 | null, null, null); | ||
| 76 | } catch (ClassNotFound ee) { | ||
| 77 | env.error(where, "class.not.found", ee.name, opNames[op]); | ||
| 78 | } | ||
| 79 | return vset; | ||
| 80 | } | ||
| 81 | vset.addVar(field.number); | ||
| 82 | return (expr != null) ? expr.checkValue(env, ctx, vset, exp) : vset; | ||
| 83 | } | ||
| 84 | |||
| 85 | // Argument 'expr' is either an IdentifierExpression for a declaration of | ||
| 86 | // the form 'type x' or an AssignmentExpression for a declaration of the | ||
| 87 | // form 'type x = initvalue'. Note that these expressions are treated | ||
| 88 | // specially in this context, and don't have much connection to their ordinary | ||
| 89 | // meaning. | ||
| 90 | |||
| 91 | Expression e = expr; | ||
| 92 | |||
| 93 | if (e.op == ASSIGN) { | ||
| 94 | expr = ((AssignExpression)e).right; | ||
| 95 | e = ((AssignExpression)e).left; | ||
| 96 | } else { | ||
| 97 | expr = null; | ||
| 98 | } | ||
| 99 | |||
| 100 | boolean declError = t.isType(TC_ERROR); | ||
| 101 | while (e.op == ARRAYACCESS) { | ||
| 102 | ArrayAccessExpression array = (ArrayAccessExpression)e; | ||
| 103 | if (array.index != null) { | ||
| 104 | env.error(array.index.where, "array.dim.in.type"); | ||
| 105 | declError = true; | ||
| 106 | } | ||
| 107 | e = array.right; | ||
| 108 | t = Type.tArray(t); | ||
| 109 | } | ||
| 110 | if (e.op == IDENT) { | ||
| 111 | Identifier id = ((IdentifierExpression)e).id; | ||
| 112 | if (ctx.getLocalField(id) != null) { | ||
| 113 | env.error(where, "local.redefined", id); | ||
| 114 | } | ||
| 115 | |||
| 116 | field = new LocalMember(e.where, ctx.field.getClassDefinition(), mod, t, id); | ||
| 117 | ctx.declare(env, field); | ||
| 118 | |||
| 119 | if (expr != null) { | ||
| 120 | vset = expr.checkInitializer(env, ctx, vset, t, exp); | ||
| 121 | expr = convert(env, ctx, t, expr); | ||
| 122 | field.setValue(expr); // for the sake of non-blank finals | ||
| 123 | if (field.isConstant()) { | ||
| 124 | // Keep in mind that isConstant() only means expressions | ||
| 125 | // that are constant according to the JLS. They might | ||
| 126 | // not be either constants or evaluable (eg. 1/0). | ||
| 127 | field.addModifiers(M_INLINEABLE); | ||
| 128 | } | ||
| 129 | vset.addVar(field.number); | ||
| 130 | } else if (declError) { | ||
| 131 | vset.addVar(field.number); | ||
| 132 | } else { | ||
| 133 | vset.addVarUnassigned(field.number); | ||
| 134 | } | ||
| 135 | return vset; | ||
| 136 | } | ||
| 137 | env.error(e.where, "invalid.decl"); | ||
| 138 | return vset; | ||
| 139 | } | ||
| 140 | |||
| 141 | /** | ||
| 142 | * Inline | ||
| 143 | */ | ||
| 144 | public Statement inline(Environment env, Context ctx) { | ||
| 145 | if (field.isInnerClass()) { | ||
| 146 | ClassDefinition body = field.getInnerClass(); | ||
| 147 | body.inlineLocalClass(env); | ||
| 148 | return null; | ||
| 149 | } | ||
| 150 | |||
| 151 | // Don't generate code for variable if unused and | ||
| 152 | // optimization is on, whether or not debugging is on | ||
| 153 | if (env.opt() && !field.isUsed()) { | ||
| 154 | return new ExpressionStatement(where, expr).inline(env, ctx); | ||
| 155 | } | ||
| 156 | |||
| 157 | ctx.declare(env, field); | ||
| 158 | |||
| 159 | if (expr != null) { | ||
| 160 | expr = expr.inlineValue(env, ctx); | ||
| 161 | field.setValue(expr); // for the sake of non-blank finals | ||
| 162 | if (env.opt() && (field.writecount == 0)) { | ||
| 163 | if (expr.op == IDENT) { | ||
| 164 | |||
| 165 | // This code looks like it tests whether a final variable | ||
| 166 | // is being initialized by an identifier expression. | ||
| 167 | // Then if the identifier is a local of the same method | ||
| 168 | // it makes the final variable eligible to be inlined. | ||
| 169 | // BUT: why isn't the local also checked to make sure | ||
| 170 | // it is itself final? Unknown. | ||
| 171 | |||
| 172 | IdentifierExpression e = (IdentifierExpression)expr; | ||
| 173 | if (e.field.isLocal() && ((ctx = ctx.getInlineContext()) != null) && | ||
| 174 | (((LocalMember)e.field).number < ctx.varNumber)) { | ||
| 175 | //System.out.println("FINAL IDENT = " + field + " in " + ctx.field); | ||
| 176 | field.setValue(expr); | ||
| 177 | field.addModifiers(M_INLINEABLE); | ||
| 178 | |||
| 179 | // The two lines below used to elide the declaration | ||
| 180 | // of inlineable variables, on the theory that there | ||
| 181 | // wouldn't be any references. But this breaks the | ||
| 182 | // translation of nested classes, which might refer to | ||
| 183 | // the variable. | ||
| 184 | |||
| 185 | //expr = null; | ||
| 186 | //return null; | ||
| 187 | } | ||
| 188 | } | ||
| 189 | if (expr.isConstant() || (expr.op == THIS) || (expr.op == SUPER)) { | ||
| 190 | //System.out.println("FINAL = " + field + " in " + ctx.field); | ||
| 191 | field.setValue(expr); | ||
| 192 | field.addModifiers(M_INLINEABLE); | ||
| 193 | |||
| 194 | // The two lines below used to elide the declaration | ||
| 195 | // of inlineable variables, on the theory that there | ||
| 196 | // wouldn't be any references. But this breaks the | ||
| 197 | // translation of nested classes, which might refer to | ||
| 198 | // the variable. Fix for 4073244. | ||
| 199 | |||
| 200 | //expr = null; | ||
| 201 | //return null; | ||
| 202 | } | ||
| 203 | } | ||
| 204 | } | ||
| 205 | return this; | ||
| 206 | } | ||
| 207 | |||
| 208 | /** | ||
| 209 | * Create a copy of the statement for method inlining | ||
| 210 | */ | ||
| 211 | public Statement copyInline(Context ctx, boolean valNeeded) { | ||
| 212 | VarDeclarationStatement s = (VarDeclarationStatement)clone(); | ||
| 213 | if (expr != null) { | ||
| 214 | s.expr = expr.copyInline(ctx); | ||
| 215 | } | ||
| 216 | return s; | ||
| 217 | } | ||
| 218 | |||
| 219 | /** | ||
| 220 | * The cost of inlining this statement | ||
| 221 | */ | ||
| 222 | public int costInline(int thresh, Environment env, Context ctx) { | ||
| 223 | if (field != null && field.isInnerClass()) { | ||
| 224 | return thresh; // don't copy classes... | ||
| 225 | } | ||
| 226 | return (expr != null) ? expr.costInline(thresh, env, ctx) : 0; | ||
| 227 | } | ||
| 228 | |||
| 229 | /** | ||
| 230 | * Code | ||
| 231 | */ | ||
| 232 | public void code(Environment env, Context ctx, Assembler asm) { | ||
| 233 | if (expr != null && !expr.type.isType(TC_VOID)) { | ||
| 234 | // The two lines of code directly following this comment used | ||
| 235 | // to be in the opposite order. They were switched so that | ||
| 236 | // lines like the following: | ||
| 237 | // | ||
| 238 | // int j = (j = 4); | ||
| 239 | // | ||
| 240 | // will compile correctly. (Constructions like the above are | ||
| 241 | // legal. JLS 14.3.2 says that the scope of a local variable | ||
| 242 | // includes its own initializer.) It is important that we | ||
| 243 | // declare `field' before we code `expr', because otherwise | ||
| 244 | // situations can arise where `field' thinks it is assigned | ||
| 245 | // a local variable slot that is, in actuality, assigned to | ||
| 246 | // an entirely different variable. (Bug id 4076729) | ||
| 247 | ctx.declare(env, field); | ||
| 248 | expr.codeValue(env, ctx, asm); | ||
| 249 | |||
| 250 | asm.add(where, opc_istore + field.getType().getTypeCodeOffset(), | ||
| 251 | new LocalVariable(field, field.number)); | ||
| 252 | } else { | ||
| 253 | ctx.declare(env, field); | ||
| 254 | if (expr != null) { | ||
| 255 | // an initial side effect, rather than an initial value | ||
| 256 | expr.code(env, ctx, asm); | ||
| 257 | } | ||
| 258 | } | ||
| 259 | } | ||
| 260 | |||
| 261 | /** | ||
| 262 | |||
| 263 | */ | ||
| 264 | public void print(PrintStream out, int indent) { | ||
| 265 | out.print("local "); | ||
| 266 | if (field != null) { | ||
| 267 | out.print(field + "#" + field.hashCode()); | ||
| 268 | if (expr != null) { | ||
| 269 | out.print(" = "); | ||
| 270 | expr.print(out); | ||
| 271 | } | ||
| 272 | } else { | ||
| 273 | expr.print(out); | ||
| 274 | out.print(";"); | ||
| 275 | } | ||
| 276 | } | ||
| 277 | } | ||