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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 sun.tools.asm.Label;
31  import java.io.PrintStream;
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 InlineReturnStatement extends Statement {
40      Expression expr;
41  
42      /**
43       * Constructor
44       */
45      public InlineReturnStatement(long where, Expression expr) {
46          super(INLINERETURN, where);
47          this.expr = expr;
48      }
49  
50      /**
51       * Get the destination context of a break
52       */
53      Context getDestination(Context ctx) {
54          for (; ctx != null ; ctx = ctx.prev) {
55              if ((ctx.node != null) && ((ctx.node.op == INLINEMETHOD) || (ctx.node.op == INLINENEWINSTANCE))) {
56                  return ctx;
57              }
58          }
59          return null;
60      }
61  
62      /**
63       * Inline
64       */
65      public Statement inline(Environment env, Context ctx) {
66          if (expr != null) {
67              expr = expr.inlineValue(env, ctx);
68          }
69          return this;
70      }
71  
72      /**
73       * Create a copy of the statement for method inlining
74       */
75      public Statement copyInline(Context ctx, boolean valNeeded) {
76          InlineReturnStatement s = (InlineReturnStatement)clone();
77          if (expr != null) {
78              s.expr = expr.copyInline(ctx);
79          }
80          return s;
81      }
82  
83      /**
84       * The cost of inlining this statement
85       */
86      public int costInline(int thresh, Environment env, Context ctx) {
87          return 1 + ((expr != null) ? expr.costInline(thresh, env, ctx) : 0);
88      }
89  
90      /**
91       * Code
92       */
93      public void code(Environment env, Context ctx, Assembler asm) {
94          if (expr != null) {
95              expr.codeValue(env, ctx, asm);
96          }
97          CodeContext destctx = (CodeContext)getDestination(ctx);
98          asm.add(where, opc_goto, destctx.breakLabel);
99      }
100 
101     /**
102      * Print
103      */
104     public void print(PrintStream out, int indent) {
105         super.print(out, indent);
106         out.print("inline-return");
107         if (expr != null) {
108             out.print(" ");
109             expr.print(out);
110         }
111         out.print(";");
112     }
113 }