0N/A/*
2362N/A * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved.
0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
0N/A *
0N/A * This code is free software; you can redistribute it and/or modify it
0N/A * under the terms of the GNU General Public License version 2 only, as
2362N/A * published by the Free Software Foundation. Oracle designates this
0N/A * particular file as subject to the "Classpath" exception as provided
2362N/A * by Oracle in the LICENSE file that accompanied this code.
0N/A *
0N/A * This code is distributed in the hope that it will be useful, but WITHOUT
0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
0N/A * version 2 for more details (a copy is included in the LICENSE file that
0N/A * accompanied this code).
0N/A *
0N/A * You should have received a copy of the GNU General Public License version
0N/A * 2 along with this work; if not, write to the Free Software Foundation,
0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
0N/A *
2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
2362N/A * or visit www.oracle.com if you need additional information or have any
2362N/A * questions.
0N/A */
0N/A
0N/Apackage sun.tools.tree;
0N/A
0N/Aimport sun.tools.java.*;
0N/Aimport sun.tools.asm.Assembler;
0N/Aimport sun.tools.asm.Label;
0N/Aimport java.io.PrintStream;
0N/Aimport java.util.Hashtable;
0N/A
0N/A/**
0N/A * WARNING: The contents of this source file are not part of any
0N/A * supported API. Code that depends on them does so at its own risk:
0N/A * they are subject to change or removal without notice.
0N/A */
0N/Apublic
0N/Aclass ForStatement extends Statement {
0N/A Statement init;
0N/A Expression cond;
0N/A Expression inc;
0N/A Statement body;
0N/A
0N/A /**
0N/A * Constructor
0N/A */
0N/A public ForStatement(long where, Statement init, Expression cond, Expression inc, Statement body) {
0N/A super(FOR, where);
0N/A this.init = init;
0N/A this.cond = cond;
0N/A this.inc = inc;
0N/A this.body = body;
0N/A }
0N/A
0N/A /**
0N/A * Check statement
0N/A */
0N/A Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) {
0N/A checkLabel(env, ctx);
0N/A vset = reach(env, vset);
0N/A Context initctx = new Context(ctx, this);
0N/A if (init != null) {
0N/A vset = init.checkBlockStatement(env, initctx, vset, exp);
0N/A }
0N/A CheckContext newctx = new CheckContext(initctx, this);
0N/A // remember what was unassigned on entry
0N/A Vset vsEntry = vset.copy();
0N/A ConditionVars cvars;
0N/A if (cond != null) {
0N/A cvars = cond.checkCondition(env, newctx, vset, exp);
0N/A cond = convert(env, newctx, Type.tBoolean, cond);
0N/A } else {
0N/A // a missing test is equivalent to "true"
0N/A cvars = new ConditionVars();
0N/A cvars.vsFalse = Vset.DEAD_END;
0N/A cvars.vsTrue = vset;
0N/A }
0N/A vset = body.check(env, newctx, cvars.vsTrue, exp);
0N/A vset = vset.join(newctx.vsContinue);
0N/A if (inc != null) {
0N/A vset = inc.check(env, newctx, vset, exp);
0N/A }
0N/A // Make sure the back-branch fits the entry of the loop.
0N/A // Must include variables declared in the for-init part in the
0N/A // set of variables visible upon loop entry that must be checked.
0N/A initctx.checkBackBranch(env, this, vsEntry, vset);
0N/A // exit by testing false or executing a break;
0N/A vset = newctx.vsBreak.join(cvars.vsFalse);
0N/A return ctx.removeAdditionalVars(vset);
0N/A }
0N/A
0N/A /**
0N/A * Inline
0N/A */
0N/A public Statement inline(Environment env, Context ctx) {
0N/A ctx = new Context(ctx, this);
0N/A if (init != null) {
0N/A Statement body[] = {init, this};
0N/A init = null;
0N/A return new CompoundStatement(where, body).inline(env, ctx);
0N/A }
0N/A if (cond != null) {
0N/A cond = cond.inlineValue(env, ctx);
0N/A }
0N/A if (body != null) {
0N/A body = body.inline(env, ctx);
0N/A }
0N/A if (inc != null) {
0N/A inc = inc.inline(env, ctx);
0N/A }
0N/A return this;
0N/A }
0N/A
0N/A /**
0N/A * Create a copy of the statement for method inlining
0N/A */
0N/A public Statement copyInline(Context ctx, boolean valNeeded) {
0N/A ForStatement s = (ForStatement)clone();
0N/A if (init != null) {
0N/A s.init = init.copyInline(ctx, valNeeded);
0N/A }
0N/A if (cond != null) {
0N/A s.cond = cond.copyInline(ctx);
0N/A }
0N/A if (body != null) {
0N/A s.body = body.copyInline(ctx, valNeeded);
0N/A }
0N/A if (inc != null) {
0N/A s.inc = inc.copyInline(ctx);
0N/A }
0N/A return s;
0N/A }
0N/A
0N/A /**
0N/A * The cost of inlining this statement
0N/A */
0N/A public int costInline(int thresh, Environment env, Context ctx) {
0N/A int cost = 2;
0N/A if (init != null) {
0N/A cost += init.costInline(thresh, env, ctx);
0N/A }
0N/A if (cond != null) {
0N/A cost += cond.costInline(thresh, env, ctx);
0N/A }
0N/A if (body != null) {
0N/A cost += body.costInline(thresh, env, ctx);
0N/A }
0N/A if (inc != null) {
0N/A cost += inc.costInline(thresh, env, ctx);
0N/A }
0N/A return cost;
0N/A }
0N/A
0N/A /**
0N/A * Code
0N/A */
0N/A public void code(Environment env, Context ctx, Assembler asm) {
0N/A CodeContext newctx = new CodeContext(ctx, this);
0N/A if (init != null) {
0N/A init.code(env, newctx, asm);
0N/A }
0N/A
0N/A Label l1 = new Label();
0N/A Label l2 = new Label();
0N/A
0N/A asm.add(where, opc_goto, l2);
0N/A
0N/A asm.add(l1);
0N/A if (body != null) {
0N/A body.code(env, newctx, asm);
0N/A }
0N/A
0N/A asm.add(newctx.contLabel);
0N/A if (inc != null) {
0N/A inc.code(env, newctx, asm);
0N/A }
0N/A
0N/A asm.add(l2);
0N/A if (cond != null) {
0N/A cond.codeBranch(env, newctx, asm, l1, true);
0N/A } else {
0N/A asm.add(where, opc_goto, l1);
0N/A }
0N/A asm.add(newctx.breakLabel);
0N/A }
0N/A
0N/A /**
0N/A * Print
0N/A */
0N/A public void print(PrintStream out, int indent) {
0N/A super.print(out, indent);
0N/A out.print("for (");
0N/A if (init != null) {
0N/A init.print(out, indent);
0N/A out.print(" ");
0N/A } else {
0N/A out.print("; ");
0N/A }
0N/A if (cond != null) {
0N/A cond.print(out);
0N/A out.print(" ");
0N/A }
0N/A out.print("; ");
0N/A if (inc != null) {
0N/A inc.print(out);
0N/A }
0N/A out.print(") ");
0N/A if (body != null) {
0N/A body.print(out, indent);
0N/A } else {
0N/A out.print(";");
0N/A }
0N/A }
0N/A}