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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/SwitchStatement.java (1 of 18352 files). Show all

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java/pkg/sun/tools/tree/SwitchStatement.java+264−0
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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.Label;
31+import sun.tools.asm.SwitchData;
32+import java.io.PrintStream;
33+import java.util.Hashtable;
34+
35+/**
36+ * WARNING: The contents of this source file are not part of any
37+ * supported API. Code that depends on them does so at its own risk:
38+ * they are subject to change or removal without notice.
39+ */
40+public
41+class SwitchStatement extends Statement {
42+ Expression expr;
43+ Statement args[];
44+
45+ /**
46+ * Constructor
47+ */
48+ public SwitchStatement(long where, Expression expr, Statement args[]) {
49+ super(SWITCH, where);
50+ this.expr = expr;
51+ this.args = args;
52+ }
53+
54+ /**
55+ * Check statement
56+ */
57+ Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
58+ checkLabel(env, ctx);
59+ CheckContext newctx = new CheckContext(ctx, this);
60+ vset = expr.checkValue(env, newctx, reach(env, vset), exp);
61+ Type switchType = expr.type;
62+
63+ expr = convert(env, newctx, Type.tInt, expr);
64+
65+ Hashtable tab = new Hashtable();
66+ boolean hasDefault = false;
67+ // Note that vs is reset to vset.copy() on every case label.
68+ // If the first substatement is not a case label, it is unreached.
69+ Vset vs = DEAD_END;
70+
71+ for (int i = 0 ; i < args.length ; i++) {
72+ Statement s = args[i];
73+
74+ if (s.op == CASE) {
75+
76+ vs = s.check(env, newctx, vs.join(vset.copy()), exp);
77+
78+ Expression lbl = ((CaseStatement)s).expr;
79+ if (lbl != null) {
80+ if (lbl instanceof IntegerExpression) {
81+ Integer Ivalue =
82+ (Integer)(((IntegerExpression)lbl).getValue());
83+ int ivalue = Ivalue.intValue();
84+ if (tab.get(lbl) != null) {
85+ env.error(s.where, "duplicate.label", Ivalue);
86+ } else {
87+ tab.put(lbl, s);
88+ boolean overflow;
89+ switch (switchType.getTypeCode()) {
90+ case TC_BYTE:
91+ overflow = (ivalue != (byte)ivalue); break;
92+ case TC_SHORT:
93+ overflow = (ivalue != (short)ivalue); break;
94+ case TC_CHAR:
95+ overflow = (ivalue != (char)ivalue); break;
96+ default:
97+ overflow = false;
98+ }
99+ if (overflow) {
100+ env.error(s.where, "switch.overflow",
101+ Ivalue, switchType);
102+ }
103+ }
104+ } else {
105+ // Suppose a class got an error early on during
106+ // checking. It will set all of its members to
107+ // have the status "ERROR". Now suppose that a
108+ // case label refers to one of this class's
109+ // fields. When we check the case label, the
110+ // compiler will try to inline the FieldExpression.
111+ // Since the expression has ERROR status, it doesn't
112+ // inline. This means that instead of the case
113+ // label being an IntegerExpression, it will still
114+ // be a FieldExpression, and we will end up in this
115+ // else block. So, before we just assume that
116+ // the expression isn't constant, do a check to
117+ // see if it was constant but unable to inline.
118+ // This eliminates some spurious error messages.
119+ // (Bug id 4067498).
120+ if (!lbl.isConstant() ||
121+ lbl.getType() != Type.tInt) {
122+ env.error(s.where, "const.expr.required");
123+ }
124+ }
125+ } else {
126+ if (hasDefault) {
127+ env.error(s.where, "duplicate.default");
128+ }
129+ hasDefault = true;
130+ }
131+ } else {
132+ vs = s.checkBlockStatement(env, newctx, vs, exp);
133+ }
134+ }
135+ if (!vs.isDeadEnd()) {
136+ newctx.vsBreak = newctx.vsBreak.join(vs);
137+ }
138+ if (hasDefault)
139+ vset = newctx.vsBreak;
140+ return ctx.removeAdditionalVars(vset);
141+ }
142+
143+ /**
144+ * Inline
145+ */
146+ public Statement inline(Environment env, Context ctx) {
147+ ctx = new Context(ctx, this);
148+ expr = expr.inlineValue(env, ctx);
149+ for (int i = 0 ; i < args.length ; i++) {
150+ if (args[i] != null) {
151+ args[i] = args[i].inline(env, ctx);
152+ }
153+ }
154+ return this;
155+ }
156+
157+ /**
158+ * Create a copy of the statement for method inlining
159+ */
160+ public Statement copyInline(Context ctx, boolean valNeeded) {
161+ SwitchStatement s = (SwitchStatement)clone();
162+ s.expr = expr.copyInline(ctx);
163+ s.args = new Statement[args.length];
164+ for (int i = 0 ; i < args.length ; i++) {
165+ if (args[i] != null) {
166+ s.args[i] = args[i].copyInline(ctx, valNeeded);
167+ }
168+ }
169+ return s;
170+ }
171+
172+ /**
173+ * The cost of inlining this statement
174+ */
175+ public int costInline(int thresh, Environment env, Context ctx) {
176+ int cost = expr.costInline(thresh, env, ctx);
177+ for (int i = 0 ; (i < args.length) && (cost < thresh) ; i++) {
178+ if (args[i] != null) {
179+ cost += args[i].costInline(thresh, env, ctx);
180+ }
181+ }
182+ return cost;
183+ }
184+
185+ /**
186+ * Code
187+ */
188+ public void code(Environment env, Context ctx, Assembler asm) {
189+ CodeContext newctx = new CodeContext(ctx, this);
190+
191+ expr.codeValue(env, newctx, asm);
192+
193+ SwitchData sw = new SwitchData();
194+ boolean hasDefault = false;
195+
196+ for (int i = 0 ; i < args.length ; i++) {
197+ Statement s = args[i];
198+ if ((s != null) && (s.op == CASE)) {
199+ Expression e = ((CaseStatement)s).expr;
200+ if (e != null) {
201+ sw.add(((IntegerExpression)e).value, new Label());
202+ }
203+// JCOV
204+ else {
205+ hasDefault = true;
206+ }
207+// end JCOV
208+ }
209+ }
210+
211+// JCOV
212+ if (env.coverage())
213+ sw.initTableCase();
214+// end JCOV
215+ asm.add(where, opc_tableswitch, sw);
216+
217+ for (int i = 0 ; i < args.length ; i++) {
218+ Statement s = args[i];
219+ if (s != null) {
220+ if (s.op == CASE) {
221+ Expression e = ((CaseStatement)s).expr;
222+ if (e != null) {
223+ asm.add(sw.get(((IntegerExpression)e).value));
224+// JCOV
225+ sw.addTableCase(((IntegerExpression)e).value, s.where);
226+// end JCOV
227+ } else {
228+ asm.add(sw.getDefaultLabel());
229+// JCOV
230+ sw.addTableDefault(s.where);
231+// end JCOV
232+/* JCOV hasDefault = true; end JCOV */
233+ }
234+ } else {
235+ s.code(env, newctx, asm);
236+ }
237+ }
238+ }
239+
240+ if (!hasDefault) {
241+ asm.add(sw.getDefaultLabel());
242+ }
243+ asm.add(newctx.breakLabel);
244+ }
245+
246+ /**
247+ * Print
248+ */
249+ public void print(PrintStream out, int indent) {
250+ super.print(out, indent);
251+ out.print("switch (");
252+ expr.print(out);
253+ out.print(") {\n");
254+ for (int i = 0 ; i < args.length ; i++) {
255+ if (args[i] != null) {
256+ printIndent(out, indent + 1);
257+ args[i].print(out, indent + 1);
258+ out.print("\n");
259+ }
260+ }
261+ printIndent(out, indent);
262+ out.print("}");
263+ }
264+}