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 ReturnStatement extends Statement {
0N/A Expression expr;
0N/A
0N/A /**
0N/A * Constructor
0N/A */
0N/A public ReturnStatement(long where, Expression expr) {
0N/A super(RETURN, where);
0N/A this.expr = expr;
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 if (expr != null) {
0N/A vset = expr.checkValue(env, ctx, vset, exp);
0N/A }
0N/A
0N/A // Make sure the return isn't inside a static initializer
0N/A if (ctx.field.isInitializer()) {
0N/A env.error(where, "return.inside.static.initializer");
0N/A return DEAD_END;
0N/A }
0N/A // Check return type
0N/A if (ctx.field.getType().getReturnType().isType(TC_VOID)) {
0N/A if (expr != null) {
0N/A if (ctx.field.isConstructor()) {
0N/A env.error(where, "return.with.value.constr", ctx.field);
0N/A } else {
0N/A env.error(where, "return.with.value", ctx.field);
0N/A }
0N/A expr = null;
0N/A }
0N/A } else {
0N/A if (expr == null) {
0N/A env.error(where, "return.without.value", ctx.field);
0N/A } else {
0N/A expr = convert(env, ctx, ctx.field.getType().getReturnType(), expr);
0N/A }
0N/A }
0N/A CheckContext mctx = ctx.getReturnContext();
0N/A if (mctx != null) {
0N/A mctx.vsBreak = mctx.vsBreak.join(vset);
0N/A }
0N/A CheckContext exitctx = ctx.getTryExitContext();
0N/A if (exitctx != null) {
0N/A exitctx.vsTryExit = exitctx.vsTryExit.join(vset);
0N/A }
0N/A if (expr != null) {
0N/A // see if we are returning a value out of a try or synchronized
0N/A // statement. If so, find the outermost one. . . .
0N/A Node outerFinallyNode = null;
0N/A for (Context c = ctx; c != null; c = c.prev) {
0N/A if (c.node == null) {
0N/A continue;
0N/A }
0N/A if (c.node.op == METHOD) {
0N/A // Don't search outside current method. Fixes 4084230.
0N/A break;
0N/A }
0N/A if (c.node.op == SYNCHRONIZED) {
0N/A outerFinallyNode = c.node;
0N/A break;
0N/A } else if (c.node.op == FINALLY
0N/A && ((CheckContext)c).vsContinue != null) {
0N/A outerFinallyNode = c.node;
0N/A }
0N/A }
0N/A if (outerFinallyNode != null) {
0N/A if (outerFinallyNode.op == FINALLY) {
0N/A ((FinallyStatement)outerFinallyNode).needReturnSlot = true;
0N/A } else {
0N/A ((SynchronizedStatement)outerFinallyNode).needReturnSlot = true;
0N/A }
0N/A }
0N/A }
0N/A return DEAD_END;
0N/A }
0N/A
0N/A
0N/A /**
0N/A * Inline
0N/A */
0N/A public Statement inline(Environment env, Context ctx) {
0N/A if (expr != null) {
0N/A expr = expr.inlineValue(env, ctx);
0N/A }
0N/A return this;
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 return 1 + ((expr != null) ? expr.costInline(thresh, env, ctx) : 0);
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 Expression e = (expr != null) ? expr.copyInline(ctx) : null;
0N/A if ((!valNeeded) && (e != null)) {
0N/A Statement body[] = {
0N/A new ExpressionStatement(where, e),
0N/A new InlineReturnStatement(where, null)
0N/A };
0N/A return new CompoundStatement(where, body);
0N/A }
0N/A return new InlineReturnStatement(where, e);
0N/A }
0N/A
0N/A /**
0N/A * Code
0N/A */
0N/A public void code(Environment env, Context ctx, Assembler asm) {
0N/A if (expr == null) {
0N/A codeFinally(env, ctx, asm, null, null);
0N/A asm.add(where, opc_return);
0N/A } else {
0N/A expr.codeValue(env, ctx, asm);
0N/A codeFinally(env, ctx, asm, null, expr.type);
0N/A asm.add(where, opc_ireturn + expr.type.getTypeCodeOffset());
0N/A }
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("return");
0N/A if (expr != null) {
0N/A out.print(" ");
0N/A expr.print(out);
0N/A }
0N/A out.print(";");
0N/A }
0N/A}