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| 1 | /* | ||
| 2 | * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. | ||
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | ||
| 4 | * | ||
| 5 | * This code is free software; you can redistribute it and/or modify it | ||
| 6 | * under the terms of the GNU General Public License version 2 only, as | ||
| 7 | * published by the Free Software Foundation. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package sun.tools.tree; | ||
| 27 | |||
| 28 | import sun.tools.java.*; | ||
| 29 | import sun.tools.asm.Assembler; | ||
| 30 | import sun.tools.asm.Label; | ||
| 31 | import java.io.PrintStream; | ||
| 32 | import java.util.Hashtable; | ||
| 33 | |||
| 34 | /** | ||
| 35 | * WARNING: The contents of this source file are not part of any | ||
| 36 | * supported API. Code that depends on them does so at its own risk: | ||
| 37 | * they are subject to change or removal without notice. | ||
| 38 | */ | ||
| 39 | public | ||
| 40 | class ReturnStatement extends Statement { | ||
| 41 | Expression expr; | ||
| 42 | |||
| 43 | /** | ||
| 44 | * Constructor | ||
| 45 | */ | ||
| 46 | public ReturnStatement(long where, Expression expr) { | ||
| 47 | super(RETURN, where); | ||
| 48 | this.expr = expr; | ||
| 49 | } | ||
| 50 | |||
| 51 | /** | ||
| 52 | * Check statement | ||
| 53 | */ | ||
| 54 | Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) { | ||
| 55 | checkLabel(env, ctx); | ||
| 56 | vset = reach(env, vset); | ||
| 57 | if (expr != null) { | ||
| 58 | vset = expr.checkValue(env, ctx, vset, exp); | ||
| 59 | } | ||
| 60 | |||
| 61 | // Make sure the return isn't inside a static initializer | ||
| 62 | if (ctx.field.isInitializer()) { | ||
| 63 | env.error(where, "return.inside.static.initializer"); | ||
| 64 | return DEAD_END; | ||
| 65 | } | ||
| 66 | // Check return type | ||
| 67 | if (ctx.field.getType().getReturnType().isType(TC_VOID)) { | ||
| 68 | if (expr != null) { | ||
| 69 | if (ctx.field.isConstructor()) { | ||
| 70 | env.error(where, "return.with.value.constr", ctx.field); | ||
| 71 | } else { | ||
| 72 | env.error(where, "return.with.value", ctx.field); | ||
| 73 | } | ||
| 74 | expr = null; | ||
| 75 | } | ||
| 76 | } else { | ||
| 77 | if (expr == null) { | ||
| 78 | env.error(where, "return.without.value", ctx.field); | ||
| 79 | } else { | ||
| 80 | expr = convert(env, ctx, ctx.field.getType().getReturnType(), expr); | ||
| 81 | } | ||
| 82 | } | ||
| 83 | CheckContext mctx = ctx.getReturnContext(); | ||
| 84 | if (mctx != null) { | ||
| 85 | mctx.vsBreak = mctx.vsBreak.join(vset); | ||
| 86 | } | ||
| 87 | CheckContext exitctx = ctx.getTryExitContext(); | ||
| 88 | if (exitctx != null) { | ||
| 89 | exitctx.vsTryExit = exitctx.vsTryExit.join(vset); | ||
| 90 | } | ||
| 91 | if (expr != null) { | ||
| 92 | // see if we are returning a value out of a try or synchronized | ||
| 93 | // statement. If so, find the outermost one. . . . | ||
| 94 | Node outerFinallyNode = null; | ||
| 95 | for (Context c = ctx; c != null; c = c.prev) { | ||
| 96 | if (c.node == null) { | ||
| 97 | continue; | ||
| 98 | } | ||
| 99 | if (c.node.op == METHOD) { | ||
| 100 | // Don't search outside current method. Fixes 4084230. | ||
| 101 | break; | ||
| 102 | } | ||
| 103 | if (c.node.op == SYNCHRONIZED) { | ||
| 104 | outerFinallyNode = c.node; | ||
| 105 | break; | ||
| 106 | } else if (c.node.op == FINALLY | ||
| 107 | && ((CheckContext)c).vsContinue != null) { | ||
| 108 | outerFinallyNode = c.node; | ||
| 109 | } | ||
| 110 | } | ||
| 111 | if (outerFinallyNode != null) { | ||
| 112 | if (outerFinallyNode.op == FINALLY) { | ||
| 113 | ((FinallyStatement)outerFinallyNode).needReturnSlot = true; | ||
| 114 | } else { | ||
| 115 | ((SynchronizedStatement)outerFinallyNode).needReturnSlot = true; | ||
| 116 | } | ||
| 117 | } | ||
| 118 | } | ||
| 119 | return DEAD_END; | ||
| 120 | } | ||
| 121 | |||
| 122 | |||
| 123 | /** | ||
| 124 | * Inline | ||
| 125 | */ | ||
| 126 | public Statement inline(Environment env, Context ctx) { | ||
| 127 | if (expr != null) { | ||
| 128 | expr = expr.inlineValue(env, ctx); | ||
| 129 | } | ||
| 130 | return this; | ||
| 131 | } | ||
| 132 | |||
| 133 | /** | ||
| 134 | * The cost of inlining this statement | ||
| 135 | */ | ||
| 136 | public int costInline(int thresh, Environment env, Context ctx) { | ||
| 137 | return 1 + ((expr != null) ? expr.costInline(thresh, env, ctx) : 0); | ||
| 138 | } | ||
| 139 | |||
| 140 | /** | ||
| 141 | * Create a copy of the statement for method inlining | ||
| 142 | */ | ||
| 143 | public Statement copyInline(Context ctx, boolean valNeeded) { | ||
| 144 | Expression e = (expr != null) ? expr.copyInline(ctx) : null; | ||
| 145 | if ((!valNeeded) && (e != null)) { | ||
| 146 | Statement body[] = { | ||
| 147 | new ExpressionStatement(where, e), | ||
| 148 | new InlineReturnStatement(where, null) | ||
| 149 | }; | ||
| 150 | return new CompoundStatement(where, body); | ||
| 151 | } | ||
| 152 | return new InlineReturnStatement(where, e); | ||
| 153 | } | ||
| 154 | |||
| 155 | /** | ||
| 156 | * Code | ||
| 157 | */ | ||
| 158 | public void code(Environment env, Context ctx, Assembler asm) { | ||
| 159 | if (expr == null) { | ||
| 160 | codeFinally(env, ctx, asm, null, null); | ||
| 161 | asm.add(where, opc_return); | ||
| 162 | } else { | ||
| 163 | expr.codeValue(env, ctx, asm); | ||
| 164 | codeFinally(env, ctx, asm, null, expr.type); | ||
| 165 | asm.add(where, opc_ireturn + expr.type.getTypeCodeOffset()); | ||
| 166 | } | ||
| 167 | } | ||
| 168 | |||
| 169 | /** | ||
| 170 | |||
| 171 | */ | ||
| 172 | public void print(PrintStream out, int indent) { | ||
| 173 | super.print(out, indent); | ||
| 174 | out.print("return"); | ||
| 175 | if (expr != null) { | ||
| 176 | out.print(" "); | ||
| 177 | expr.print(out); | ||
| 178 | } | ||
| 179 | out.print(";"); | ||
| 180 | } | ||
| 181 | } | ||