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      */
ThrowStatement(long where, Expression expr)45     public ThrowStatement(long where, Expression expr) {
46         super(THROW, where);
47         this.expr = expr;
48     }
49 
50     /**
51      * Check statement
52      */
check(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> exp)53     Vset check(Environment env, Context ctx, Vset vset, Hashtable<Object, Object> 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      */
inline(Environment env, Context ctx)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      */
copyInline(Context ctx, boolean valNeeded)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      */
costInline(int thresh, Environment env, Context ctx)103     public int costInline(int thresh, Environment env, Context ctx) {
104         return 1 + expr.costInline(thresh, env, ctx);
105     }
106 
107     /**
108      * Code
109      */
code(Environment env, Context ctx, Assembler asm)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      */
print(PrintStream out, int indent)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 }
125