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