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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * 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,
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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.
/** * 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
/** * 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
/** * 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
/** * 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
/** * 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
/** * 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
/** * 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
/** * 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(";"); } } }