1 /* 2 * Copyright (c) 1994, 2004, 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 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 */ CatchStatement(long where, Expression texpr, IdentifierToken id, Statement body)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 CatchStatement(long where, Expression texpr, Identifier id, Statement body)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 */ check(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp)70 Vset check(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> 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 */ inline(Environment env, Context ctx)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 */ copyInline(Context ctx, boolean valNeeded)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 */ costInline(int thresh, Environment env, Context ctx)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 */ code(Environment env, Context ctx, Assembler asm)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 */ print(PrintStream out, int indent)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 } 174