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J. Duke319a3b92007-12-01 00:00:00 +00001/*
2 * Copyright 1994-2003 Sun Microsystems, Inc. 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. Sun designates this
8 * particular file as subject to the "Classpath" exception as provided
9 * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
22 * CA 95054 USA or visit www.sun.com if you need additional information or
23 * have any questions.
24 */
25
26package sun.tools.tree;
27
28import sun.tools.java.*;
29import sun.tools.asm.Assembler;
30
31/**
32 * WARNING: The contents of this source file are not part of any
33 * supported API. Code that depends on them does so at its own risk:
34 * they are subject to change or removal without notice.
35 */
36public
37class AssignAddExpression extends AssignOpExpression {
38 /**
39 * Constructor
40 */
41 public AssignAddExpression(long where, Expression left, Expression right) {
42 super(ASGADD, where, left, right);
43 }
44
45
46 /**
47 * The cost of inlining this statement
48 */
49 public int costInline(int thresh, Environment env, Context ctx) {
50 return type.isType(TC_CLASS) ? 25 : super.costInline(thresh, env, ctx);
51 }
52
53 /**
54 * Code
55 */
56 void code(Environment env, Context ctx, Assembler asm, boolean valNeeded) {
57 if (itype.isType(TC_CLASS)) {
58 // Create code for String += <value>
59 try {
60 // Create new string buffer.
61 Type argTypes[] = {Type.tString};
62 ClassDeclaration c =
63 env.getClassDeclaration(idJavaLangStringBuffer);
64
65 if (updater == null) {
66
67 // No access method is needed.
68
69 asm.add(where, opc_new, c);
70 asm.add(where, opc_dup);
71 // stack: ...<buffer><buffer>
72 int depth = left.codeLValue(env, ctx, asm);
73 codeDup(env, ctx, asm, depth, 2); // copy past 2 string buffers
74 // stack: ...[<getter args>]<buffer><buffer>[<getter args>]
75 // where <buffer> isn't yet initialized, and the <getter args>
76 // has length depth and is whatever is needed to get/set the
77 // value
78 left.codeLoad(env, ctx, asm);
79 left.ensureString(env, ctx, asm); // Why is this needed?
80 // stack: ...[<getter args>]<buffer><buffer><string>
81 // call .<init>(String)
82 ClassDefinition sourceClass = ctx.field.getClassDefinition();
83 MemberDefinition f = c.getClassDefinition(env)
84 .matchMethod(env, sourceClass,
85 idInit, argTypes);
86 asm.add(where, opc_invokespecial, f);
87 // stack: ...[<getter args>]<initialized buffer>
88 // .append(value).toString()
89 right.codeAppend(env, ctx, asm, c, false);
90 f = c.getClassDefinition(env)
91 .matchMethod(env, sourceClass, idToString);
92 asm.add(where, opc_invokevirtual, f);
93 // stack: ...[<getter args>]<string>
94 // dup the string past the <getter args>, if necessary.
95 if (valNeeded) {
96 codeDup(env, ctx, asm, Type.tString.stackSize(), depth);
97 // stack: ...<string>[<getter args>]<string>
98 }
99 // store
100 left.codeStore(env, ctx, asm);
101
102 } else {
103
104 // Access method is required.
105 // (Handling this case fixes 4102566.)
106
107 updater.startUpdate(env, ctx, asm, false);
108 // stack: ...[<getter args>]<string>
109 left.ensureString(env, ctx, asm); // Why is this needed?
110 asm.add(where, opc_new, c);
111 // stack: ...[<getter args>]<string><buffer>
112 asm.add(where, opc_dup_x1);
113 // stack: ...[<getter args>]<buffer><string><buffer>
114 asm.add(where, opc_swap);
115 // stack: ...[<getter args>]<buffer><buffer><string>
116 // call .<init>(String)
117 ClassDefinition sourceClass = ctx.field.getClassDefinition();
118 MemberDefinition f = c.getClassDefinition(env)
119 .matchMethod(env, sourceClass,
120 idInit, argTypes);
121 asm.add(where, opc_invokespecial, f);
122 // stack: ...[<getter args>]<initialized buffer>
123 // .append(value).toString()
124 right.codeAppend(env, ctx, asm, c, false);
125 f = c.getClassDefinition(env)
126 .matchMethod(env, sourceClass, idToString);
127 asm.add(where, opc_invokevirtual, f);
128 // stack: .. [<getter args>]<string>
129 updater.finishUpdate(env, ctx, asm, valNeeded);
130
131 }
132
133 } catch (ClassNotFound e) {
134 throw new CompilerError(e);
135 } catch (AmbiguousMember e) {
136 throw new CompilerError(e);
137 }
138 } else {
139 super.code(env, ctx, asm, valNeeded);
140 }
141 }
142
143 /**
144 * Code
145 */
146 void codeOperation(Environment env, Context ctx, Assembler asm) {
147 asm.add(where, opc_iadd + itype.getTypeCodeOffset());
148 }
149}