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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.Label;
30  import sun.tools.asm.Assembler;
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 InlineMethodExpression extends Expression {
40      MemberDefinition field;
41      Statement body;
42  
43      /**
44       * Constructor
45       */
46      InlineMethodExpression(long where, Type type, MemberDefinition field, Statement body) {
47          super(INLINEMETHOD, where, type);
48          this.field = field;
49          this.body = body;
50      }
51      /**
52       * Inline
53       */
54      public Expression inline(Environment env, Context ctx) {
55          body = body.inline(env, new Context(ctx, this));
56          if (body == null) {
57              return null;
58          } else if (body.op == INLINERETURN) {
59              Expression expr = ((InlineReturnStatement)body).expr;
60              if (expr != null && type.isType(TC_VOID)) {
61                  throw new CompilerError("value on inline-void return");
62              }
63              return expr;
64          } else {
65              return this;
66          }
67      }
68      public Expression inlineValue(Environment env, Context ctx) {
69          // When this node was constructed, "copyInline" walked the body
70          // with a "valNeeded" flag which made all returns either void
71          // or value-bearing.  The type of this node reflects that
72          // earlier choice.  The present inline/inlineValue distinction
73          // is ignored.
74          return inline(env, ctx);
75      }
76  
77      /**
78       * Create a copy of the expression for method inlining
79       */
80      public Expression copyInline(Context ctx) {
81          InlineMethodExpression e = (InlineMethodExpression)clone();
82          if (body != null) {
83              e.body = body.copyInline(ctx, true);
84          }
85          return e;
86      }
87  
88      /**
89       * Code
90       */
91      public void code(Environment env, Context ctx, Assembler asm) {
92          // pop the result if there is any (usually, type is already void)
93          super.code(env, ctx, asm);
94      }
95      public void codeValue(Environment env, Context ctx, Assembler asm) {
96          CodeContext newctx = new CodeContext(ctx, this);
97          body.code(env, newctx, asm);
98          asm.add(newctx.breakLabel);
99      }
100 
101     /**
102      * Print
103      */
104     public void print(PrintStream out) {
105         out.print("(" + opNames[op] + "\n");
106         body.print(out, 1);
107         out.print(")");
108     }
109 }