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/*
* Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This code is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License version 2 only, as
* published by the Free Software Foundation. Oracle designates this
* particular file as subject to the "Classpath" exception as provided
* by Oracle in the LICENSE file that accompanied this code.
*
* This code is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
* version 2 for more details (a copy is included in the LICENSE file that
* accompanied this code).
*
* You should have received a copy of the GNU General Public License version
* 2 along with this work; if not, write to the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
*
* Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
* or visit www.oracle.com if you need additional information or have any
* questions.
*/
package sun.tools.tree;
import sun.tools.java.*;
import sun.tools.asm.Assembler;
import sun.tools.asm.Label;
import java.io.PrintStream;
import java.util.Hashtable;
/**
* WARNING: The contents of this source file are not part of any
* supported API. Code that depends on them does so at its own risk:
* they are subject to change or removal without notice.
*/
public
class ForStatement extends Statement {
Statement init;
Expression cond;
Expression inc;
Statement body;
/**
* Constructor
*/
public ForStatement(long where, Statement init, Expression cond, Expression inc, Statement body) {
super(FOR, where);
this.init = init;
this.cond = cond;
this.inc = inc;
this.body = body;
}
/**
* Check statement
*/
Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
checkLabel(env, ctx);
vset = reach(env, vset);
Context initctx = new Context(ctx, this);
if (init != null) {
vset = init.checkBlockStatement(env, initctx, vset, exp);
}
CheckContext newctx = new CheckContext(initctx, this);
// remember what was unassigned on entry
Vset vsEntry = vset.copy();
ConditionVars cvars;
if (cond != null) {
cvars = cond.checkCondition(env, newctx, vset, exp);
cond = convert(env, newctx, Type.tBoolean, cond);
} else {
// a missing test is equivalent to "true"
cvars = new ConditionVars();
cvars.vsFalse = Vset.DEAD_END;
cvars.vsTrue = vset;
}
vset = body.check(env, newctx, cvars.vsTrue, exp);
vset = vset.join(newctx.vsContinue);
if (inc != null) {
vset = inc.check(env, newctx, vset, exp);
}
// Make sure the back-branch fits the entry of the loop.
// Must include variables declared in the for-init part in the
// set of variables visible upon loop entry that must be checked.
initctx.checkBackBranch(env, this, vsEntry, vset);
// exit by testing false or executing a break;
vset = newctx.vsBreak.join(cvars.vsFalse);
return ctx.removeAdditionalVars(vset);
}
/**
* Inline
*/
public Statement inline(Environment env, Context ctx) {
ctx = new Context(ctx, this);
if (init != null) {
Statement body[] = {init, this};
init = null;
return new CompoundStatement(where, body).inline(env, ctx);
}
if (cond != null) {
cond = cond.inlineValue(env, ctx);
}
if (body != null) {
body = body.inline(env, ctx);
}
if (inc != null) {
inc = inc.inline(env, ctx);
}
return this;
}
/**
* Create a copy of the statement for method inlining
*/
public Statement copyInline(Context ctx, boolean valNeeded) {
ForStatement s = (ForStatement)clone();
if (init != null) {
s.init = init.copyInline(ctx, valNeeded);
}
if (cond != null) {
s.cond = cond.copyInline(ctx);
}
if (body != null) {
s.body = body.copyInline(ctx, valNeeded);
}
if (inc != null) {
s.inc = inc.copyInline(ctx);
}
return s;
}
/**
* The cost of inlining this statement
*/
public int costInline(int thresh, Environment env, Context ctx) {
int cost = 2;
if (init != null) {
cost += init.costInline(thresh, env, ctx);
}
if (cond != null) {
cost += cond.costInline(thresh, env, ctx);
}
if (body != null) {
cost += body.costInline(thresh, env, ctx);
}
if (inc != null) {
cost += inc.costInline(thresh, env, ctx);
}
return cost;
}
/**
* Code
*/
public void code(Environment env, Context ctx, Assembler asm) {
CodeContext newctx = new CodeContext(ctx, this);
if (init != null) {
init.code(env, newctx, asm);
}
Label l1 = new Label();
Label l2 = new Label();
asm.add(where, opc_goto, l2);
asm.add(l1);
if (body != null) {
body.code(env, newctx, asm);
}
asm.add(newctx.contLabel);
if (inc != null) {
inc.code(env, newctx, asm);
}
asm.add(l2);
if (cond != null) {
cond.codeBranch(env, newctx, asm, l1, true);
} else {
asm.add(where, opc_goto, l1);
}
asm.add(newctx.breakLabel);
}
/**
* Print
*/
public void print(PrintStream out, int indent) {
super.print(out, indent);
out.print("for (");
if (init != null) {
init.print(out, indent);
out.print(" ");
} else {
out.print("; ");
}
if (cond != null) {
cond.print(out);
out.print(" ");
}
out.print("; ");
if (inc != null) {
inc.print(out);
}
out.print(") ");
if (body != null) {
body.print(out, indent);
} else {
out.print(";");
}
}
}
