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.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 | * Print |
| 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 | } |