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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 java.io.PrintStream;
31  import java.util.Hashtable;
32  
33  /**
34   * WARNING: The contents of this source file are not part of any
35   * supported API.  Code that depends on them does so at its own risk:
36   * they are subject to change or removal without notice.
37   */
38  public
39  class ThrowStatement extends Statement {
40      Expression expr;
41  
42      /**
43       * Constructor
44       */
45      public ThrowStatement(long where, Expression expr) {
46          super(THROW, where);
47          this.expr = expr;
48      }
49  
50      /**
51       * Check statement
52       */
53      Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
54          checkLabel(env, ctx);
55          try {
56              vset = reach(env, vset);
57              expr.checkValue(env, ctx, vset, exp);
58              if (expr.type.isType(TC_CLASS)) {
59                  ClassDeclaration c = env.getClassDeclaration(expr.type);
60                  if (exp.get(c) == null) {
61                      exp.put(c, this);
62                  }
63                  ClassDefinition def = c.getClassDefinition(env);
64                  ClassDeclaration throwable =
65                      env.getClassDeclaration(idJavaLangThrowable);
66                  if (!def.subClassOf(env, throwable)) {
67                      env.error(where, "throw.not.throwable", def);
68                  }
69                  expr = convert(env, ctx, Type.tObject, expr);
70              } else if (!expr.type.isType(TC_ERROR)) {
71                  env.error(expr.where, "throw.not.throwable", expr.type);
72              }
73          } catch (ClassNotFound e) {
74              env.error(where, "class.not.found", e.name, opNames[op]);
75          }
76          CheckContext exitctx = ctx.getTryExitContext();
77          if (exitctx != null) {
78              exitctx.vsTryExit = exitctx.vsTryExit.join(vset);
79          }
80          return DEAD_END;
81      }
82  
83      /**
84       * Inline
85       */
86      public Statement inline(Environment env, Context ctx) {
87          expr = expr.inlineValue(env, ctx);
88          return this;
89      }
90  
91      /**
92       * Create a copy of the statement for method inlining
93       */
94      public Statement copyInline(Context ctx, boolean valNeeded) {
95          ThrowStatement s = (ThrowStatement)clone();
96          s.expr = expr.copyInline(ctx);
97          return s;
98      }
99  
100     /**
101      * The cost of inlining this statement
102      */
103     public int costInline(int thresh, Environment env, Context ctx) {
104         return 1 + expr.costInline(thresh, env, ctx);
105     }
106 
107     /**
108      * Code
109      */
110     public void code(Environment env, Context ctx, Assembler asm) {
111         expr.codeValue(env, ctx, asm);
112         asm.add(where, opc_athrow);
113     }
114 
115     /**
116      * Print
117      */
118     public void print(PrintStream out, int indent) {
119         super.print(out, indent);
120         out.print("throw ");
121         expr.print(out);
122         out.print(":");
123     }
124 }