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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/sun/tools/tree/VarDeclarationStatement.java (1 of 18352 files). Show all

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java/pkg/sun/tools/tree/VarDeclarationStatement.java+277−0
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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.LocalVariable;
31+import java.io.PrintStream;
32+import java.util.Hashtable;
33+
34+/**
35+ * WARNING: The contents of this source file are not part of any
36+ * supported API. Code that depends on them does so at its own risk:
37+ * they are subject to change or removal without notice.
38+ */
39+public
40+class VarDeclarationStatement extends Statement {
41+ LocalMember field;
42+ Expression expr;
43+
44+ /**
45+ * Constructor
46+ */
47+ public VarDeclarationStatement(long where, Expression expr) {
48+ super(VARDECLARATION, where);
49+ this.expr = expr;
50+ }
51+ public VarDeclarationStatement(long where, LocalMember field, Expression expr) {
52+ super(VARDECLARATION, where);
53+ this.field = field;
54+ this.expr = expr;
55+ }
56+
57+ /**
58+ * Check statement
59+ */
60+ Vset checkDeclaration(Environment env, Context ctx, Vset vset, int mod, Type t, Hashtable exp) {
61+ if (labels != null) {
62+ env.error(where, "declaration.with.label", labels[0]);
63+ }
64+ if (field != null) {
65+ if (ctx.getLocalClass(field.getName()) != null
66+ && field.isInnerClass()) {
67+ env.error(where, "local.class.redefined", field.getName());
68+ }
69+
70+ ctx.declare(env, field);
71+ if (field.isInnerClass()) {
72+ ClassDefinition body = field.getInnerClass();
73+ try {
74+ vset = body.checkLocalClass(env, ctx, vset,
75+ null, null, null);
76+ } catch (ClassNotFound ee) {
77+ env.error(where, "class.not.found", ee.name, opNames[op]);
78+ }
79+ return vset;
80+ }
81+ vset.addVar(field.number);
82+ return (expr != null) ? expr.checkValue(env, ctx, vset, exp) : vset;
83+ }
84+
85+ // Argument 'expr' is either an IdentifierExpression for a declaration of
86+ // the form 'type x' or an AssignmentExpression for a declaration of the
87+ // form 'type x = initvalue'. Note that these expressions are treated
88+ // specially in this context, and don't have much connection to their ordinary
89+ // meaning.
90+
91+ Expression e = expr;
92+
93+ if (e.op == ASSIGN) {
94+ expr = ((AssignExpression)e).right;
95+ e = ((AssignExpression)e).left;
96+ } else {
97+ expr = null;
98+ }
99+
100+ boolean declError = t.isType(TC_ERROR);
101+ while (e.op == ARRAYACCESS) {
102+ ArrayAccessExpression array = (ArrayAccessExpression)e;
103+ if (array.index != null) {
104+ env.error(array.index.where, "array.dim.in.type");
105+ declError = true;
106+ }
107+ e = array.right;
108+ t = Type.tArray(t);
109+ }
110+ if (e.op == IDENT) {
111+ Identifier id = ((IdentifierExpression)e).id;
112+ if (ctx.getLocalField(id) != null) {
113+ env.error(where, "local.redefined", id);
114+ }
115+
116+ field = new LocalMember(e.where, ctx.field.getClassDefinition(), mod, t, id);
117+ ctx.declare(env, field);
118+
119+ if (expr != null) {
120+ vset = expr.checkInitializer(env, ctx, vset, t, exp);
121+ expr = convert(env, ctx, t, expr);
122+ field.setValue(expr); // for the sake of non-blank finals
123+ if (field.isConstant()) {
124+ // Keep in mind that isConstant() only means expressions
125+ // that are constant according to the JLS. They might
126+ // not be either constants or evaluable (eg. 1/0).
127+ field.addModifiers(M_INLINEABLE);
128+ }
129+ vset.addVar(field.number);
130+ } else if (declError) {
131+ vset.addVar(field.number);
132+ } else {
133+ vset.addVarUnassigned(field.number);
134+ }
135+ return vset;
136+ }
137+ env.error(e.where, "invalid.decl");
138+ return vset;
139+ }
140+
141+ /**
142+ * Inline
143+ */
144+ public Statement inline(Environment env, Context ctx) {
145+ if (field.isInnerClass()) {
146+ ClassDefinition body = field.getInnerClass();
147+ body.inlineLocalClass(env);
148+ return null;
149+ }
150+
151+ // Don't generate code for variable if unused and
152+ // optimization is on, whether or not debugging is on
153+ if (env.opt() && !field.isUsed()) {
154+ return new ExpressionStatement(where, expr).inline(env, ctx);
155+ }
156+
157+ ctx.declare(env, field);
158+
159+ if (expr != null) {
160+ expr = expr.inlineValue(env, ctx);
161+ field.setValue(expr); // for the sake of non-blank finals
162+ if (env.opt() && (field.writecount == 0)) {
163+ if (expr.op == IDENT) {
164+
165+ // This code looks like it tests whether a final variable
166+ // is being initialized by an identifier expression.
167+ // Then if the identifier is a local of the same method
168+ // it makes the final variable eligible to be inlined.
169+ // BUT: why isn't the local also checked to make sure
170+ // it is itself final? Unknown.
171+
172+ IdentifierExpression e = (IdentifierExpression)expr;
173+ if (e.field.isLocal() && ((ctx = ctx.getInlineContext()) != null) &&
174+ (((LocalMember)e.field).number < ctx.varNumber)) {
175+ //System.out.println("FINAL IDENT = " + field + " in " + ctx.field);
176+ field.setValue(expr);
177+ field.addModifiers(M_INLINEABLE);
178+
179+ // The two lines below used to elide the declaration
180+ // of inlineable variables, on the theory that there
181+ // wouldn't be any references. But this breaks the
182+ // translation of nested classes, which might refer to
183+ // the variable.
184+
185+ //expr = null;
186+ //return null;
187+ }
188+ }
189+ if (expr.isConstant() || (expr.op == THIS) || (expr.op == SUPER)) {
190+ //System.out.println("FINAL = " + field + " in " + ctx.field);
191+ field.setValue(expr);
192+ field.addModifiers(M_INLINEABLE);
193+
194+ // The two lines below used to elide the declaration
195+ // of inlineable variables, on the theory that there
196+ // wouldn't be any references. But this breaks the
197+ // translation of nested classes, which might refer to
198+ // the variable. Fix for 4073244.
199+
200+ //expr = null;
201+ //return null;
202+ }
203+ }
204+ }
205+ return this;
206+ }
207+
208+ /**
209+ * Create a copy of the statement for method inlining
210+ */
211+ public Statement copyInline(Context ctx, boolean valNeeded) {
212+ VarDeclarationStatement s = (VarDeclarationStatement)clone();
213+ if (expr != null) {
214+ s.expr = expr.copyInline(ctx);
215+ }
216+ return s;
217+ }
218+
219+ /**
220+ * The cost of inlining this statement
221+ */
222+ public int costInline(int thresh, Environment env, Context ctx) {
223+ if (field != null && field.isInnerClass()) {
224+ return thresh; // don't copy classes...
225+ }
226+ return (expr != null) ? expr.costInline(thresh, env, ctx) : 0;
227+ }
228+
229+ /**
230+ * Code
231+ */
232+ public void code(Environment env, Context ctx, Assembler asm) {
233+ if (expr != null && !expr.type.isType(TC_VOID)) {
234+ // The two lines of code directly following this comment used
235+ // to be in the opposite order. They were switched so that
236+ // lines like the following:
237+ //
238+ // int j = (j = 4);
239+ //
240+ // will compile correctly. (Constructions like the above are
241+ // legal. JLS 14.3.2 says that the scope of a local variable
242+ // includes its own initializer.) It is important that we
243+ // declare `field' before we code `expr', because otherwise
244+ // situations can arise where `field' thinks it is assigned
245+ // a local variable slot that is, in actuality, assigned to
246+ // an entirely different variable. (Bug id 4076729)
247+ ctx.declare(env, field);
248+ expr.codeValue(env, ctx, asm);
249+
250+ asm.add(where, opc_istore + field.getType().getTypeCodeOffset(),
251+ new LocalVariable(field, field.number));
252+ } else {
253+ ctx.declare(env, field);
254+ if (expr != null) {
255+ // an initial side effect, rather than an initial value
256+ expr.code(env, ctx, asm);
257+ }
258+ }
259+ }
260+
261+ /**
262+ * Print
263+ */
264+ public void print(PrintStream out, int indent) {
265+ out.print("local ");
266+ if (field != null) {
267+ out.print(field + "#" + field.hashCode());
268+ if (expr != null) {
269+ out.print(" = ");
270+ expr.print(out);
271+ }
272+ } else {
273+ expr.print(out);
274+ out.print(";");
275+ }
276+ }
277+}