J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1994-2004 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 sun.tools.asm.Label; |
| 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 CatchStatement extends Statement { |
| 42 | int mod; |
| 43 | Expression texpr; |
| 44 | Identifier id; |
| 45 | Statement body; |
| 46 | LocalMember field; |
| 47 | |
| 48 | /** |
| 49 | * Constructor |
| 50 | */ |
| 51 | public CatchStatement(long where, Expression texpr, IdentifierToken id, Statement body) { |
| 52 | super(CATCH, where); |
| 53 | this.mod = id.getModifiers(); |
| 54 | this.texpr = texpr; |
| 55 | this.id = id.getName(); |
| 56 | this.body = body; |
| 57 | } |
| 58 | /** @deprecated */ |
| 59 | @Deprecated |
| 60 | public CatchStatement(long where, Expression texpr, Identifier id, Statement body) { |
| 61 | super(CATCH, where); |
| 62 | this.texpr = texpr; |
| 63 | this.id = id; |
| 64 | this.body = body; |
| 65 | } |
| 66 | |
| 67 | /** |
| 68 | * Check statement |
| 69 | */ |
| 70 | Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) { |
| 71 | vset = reach(env, vset); |
| 72 | ctx = new Context(ctx, this); |
| 73 | Type type = texpr.toType(env, ctx); |
| 74 | |
| 75 | try { |
| 76 | if (ctx.getLocalField(id) != null) { |
| 77 | env.error(where, "local.redefined", id); |
| 78 | } |
| 79 | |
| 80 | if (type.isType(TC_ERROR)) { |
| 81 | // error message printed out elsewhere |
| 82 | } else if (!type.isType(TC_CLASS)) { |
| 83 | env.error(where, "catch.not.throwable", type); |
| 84 | } else { |
| 85 | ClassDefinition def = env.getClassDefinition(type); |
| 86 | if (!def.subClassOf(env, |
| 87 | env.getClassDeclaration(idJavaLangThrowable))) { |
| 88 | env.error(where, "catch.not.throwable", def); |
| 89 | } |
| 90 | } |
| 91 | |
| 92 | field = new LocalMember(where, ctx.field.getClassDefinition(), mod, type, id); |
| 93 | ctx.declare(env, field); |
| 94 | vset.addVar(field.number); |
| 95 | |
| 96 | return body.check(env, ctx, vset, exp); |
| 97 | } catch (ClassNotFound e) { |
| 98 | env.error(where, "class.not.found", e.name, opNames[op]); |
| 99 | return vset; |
| 100 | } |
| 101 | } |
| 102 | |
| 103 | /** |
| 104 | * Inline |
| 105 | */ |
| 106 | public Statement inline(Environment env, Context ctx) { |
| 107 | ctx = new Context(ctx, this); |
| 108 | if (field.isUsed()) { |
| 109 | ctx.declare(env, field); |
| 110 | } |
| 111 | if (body != null) { |
| 112 | body = body.inline(env, ctx); |
| 113 | } |
| 114 | return this; |
| 115 | } |
| 116 | |
| 117 | /** |
| 118 | * Create a copy of the statement for method inlining |
| 119 | */ |
| 120 | public Statement copyInline(Context ctx, boolean valNeeded) { |
| 121 | CatchStatement s = (CatchStatement)clone(); |
| 122 | if (body != null) { |
| 123 | s.body = body.copyInline(ctx, valNeeded); |
| 124 | } |
| 125 | if (field != null) { |
| 126 | s.field = field.copyInline(ctx); |
| 127 | } |
| 128 | return s; |
| 129 | } |
| 130 | |
| 131 | /** |
| 132 | * Compute cost of inlining this statement |
| 133 | */ |
| 134 | public int costInline(int thresh, Environment env, Context ctx){ |
| 135 | int cost = 1; |
| 136 | if (body != null) { |
| 137 | cost += body.costInline(thresh, env,ctx); |
| 138 | } |
| 139 | return cost; |
| 140 | } |
| 141 | |
| 142 | /** |
| 143 | * Code |
| 144 | */ |
| 145 | public void code(Environment env, Context ctx, Assembler asm) { |
| 146 | CodeContext newctx = new CodeContext(ctx, this); |
| 147 | if (field.isUsed()) { |
| 148 | newctx.declare(env, field); |
| 149 | asm.add(where, opc_astore, new LocalVariable(field, field.number)); |
| 150 | } else { |
| 151 | asm.add(where, opc_pop); |
| 152 | } |
| 153 | if (body != null) { |
| 154 | body.code(env, newctx, asm); |
| 155 | } |
| 156 | //asm.add(newctx.breakLabel); |
| 157 | } |
| 158 | |
| 159 | /** |
| 160 | * Print |
| 161 | */ |
| 162 | public void print(PrintStream out, int indent) { |
| 163 | super.print(out, indent); |
| 164 | out.print("catch ("); |
| 165 | texpr.print(out); |
| 166 | out.print(" " + id + ") "); |
| 167 | if (body != null) { |
| 168 | body.print(out, indent); |
| 169 | } else { |
| 170 | out.print("<empty>"); |
| 171 | } |
| 172 | } |
| 173 | } |