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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 java.io.PrintStream; | |
| 31 | +import java.util.Hashtable; | |
| 32 | + | |
| 33 | +/** | |
| 34 | + * WARNING: The contents of this source file are not part of any | |
| 35 | + * supported API. Code that depends on them does so at its own risk: | |
| 36 | + * they are subject to change or removal without notice. | |
| 37 | + */ | |
| 38 | +public | |
| 39 | +class AssignExpression extends BinaryAssignExpression { | |
| 40 | + | |
| 41 | + private FieldUpdater updater = null; | |
| 42 | + | |
| 43 | + /** | |
| 44 | + * Constructor | |
| 45 | + */ | |
| 46 | + public AssignExpression(long where, Expression left, Expression right) { | |
| 47 | + super(ASSIGN, where, left, right); | |
| 48 | + } | |
| 49 | + | |
| 50 | + /** | |
| 51 | + * Check an assignment expression | |
| 52 | + */ | |
| 53 | + public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) { | |
| 54 | + if (left instanceof IdentifierExpression) { | |
| 55 | + // we don't want to mark an identifier as having a value | |
| 56 | + // until having evaluated the right-hand side | |
| 57 | + vset = right.checkValue(env, ctx, vset, exp); | |
| 58 | + vset = left.checkLHS(env, ctx, vset, exp); | |
| 59 | + } else { | |
| 60 | + // normally left to right evaluation. | |
| 61 | + vset = left.checkLHS(env, ctx, vset, exp); | |
| 62 | + vset = right.checkValue(env, ctx, vset, exp); | |
| 63 | + } | |
| 64 | + type = left.type; | |
| 65 | + right = convert(env, ctx, type, right); | |
| 66 | + | |
| 67 | + // Get field updater (access method) if needed, else null. | |
| 68 | + updater = left.getAssigner(env, ctx); | |
| 69 | + | |
| 70 | + return vset; | |
| 71 | + } | |
| 72 | + | |
| 73 | + /** | |
| 74 | + * Inline | |
| 75 | + */ | |
| 76 | + public Expression inlineValue(Environment env, Context ctx) { | |
| 77 | + if (implementation != null) | |
| 78 | + return implementation.inlineValue(env, ctx); | |
| 79 | + // Must be 'inlineLHS' here. But compare with similar case in | |
| 80 | + // 'AssignOpExpression' and 'IncDecExpression', which needs 'inlineValue'. | |
| 81 | + left = left.inlineLHS(env, ctx); | |
| 82 | + right = right.inlineValue(env, ctx); | |
| 83 | + if (updater != null) { | |
| 84 | + updater = updater.inline(env, ctx); | |
| 85 | + } | |
| 86 | + return this; | |
| 87 | + } | |
| 88 | + | |
| 89 | + /** | |
| 90 | + * Create a copy of the expression for method inlining | |
| 91 | + */ | |
| 92 | + public Expression copyInline(Context ctx) { | |
| 93 | + if (implementation != null) | |
| 94 | + return implementation.copyInline(ctx); | |
| 95 | + AssignExpression e = (AssignExpression)clone(); | |
| 96 | + e.left = left.copyInline(ctx); | |
| 97 | + e.right = right.copyInline(ctx); | |
| 98 | + if (updater != null) { | |
| 99 | + e.updater = updater.copyInline(ctx); | |
| 100 | + } | |
| 101 | + return e; | |
| 102 | + } | |
| 103 | + | |
| 104 | + /** | |
| 105 | + * The cost of inlining this expression | |
| 106 | + */ | |
| 107 | + public int costInline(int thresh, Environment env, Context ctx) { | |
| 108 | + /*----------* | |
| 109 | + return 2 + super.costInline(thresh, env, ctx); | |
| 110 | + *----------*/ | |
| 111 | + return (updater != null) | |
| 112 | + // Cost of rhs expression + cost of access method call. | |
| 113 | + // Access method call cost includes lhs cost. | |
| 114 | + ? right.costInline(thresh, env, ctx) + | |
| 115 | + updater.costInline(thresh, env, ctx, false) | |
| 116 | + // Cost of rhs expression + cost of lhs expression + | |
| 117 | + // cost of store instruction. | |
| 118 | + : right.costInline(thresh, env, ctx) + | |
| 119 | + left.costInline(thresh, env, ctx) + 2; | |
| 120 | + } | |
| 121 | + | |
| 122 | + /** | |
| 123 | + * Code | |
| 124 | + */ | |
| 125 | + public void codeValue(Environment env, Context ctx, Assembler asm) { | |
| 126 | + if (updater == null) { | |
| 127 | + // Field is directly accessible. | |
| 128 | + int depth = left.codeLValue(env, ctx, asm); | |
| 129 | + right.codeValue(env, ctx, asm); | |
| 130 | + codeDup(env, ctx, asm, right.type.stackSize(), depth); | |
| 131 | + left.codeStore(env, ctx, asm); | |
| 132 | + } else { | |
| 133 | + // Must use access method. | |
| 134 | + // Left operand is always a 'FieldExpression', or | |
| 135 | + // is rewritten as one via 'implementation'. | |
| 136 | + updater.startAssign(env, ctx, asm); | |
| 137 | + right.codeValue(env, ctx, asm); | |
| 138 | + updater.finishAssign(env, ctx, asm, true); | |
| 139 | + } | |
| 140 | + } | |
| 141 | + | |
| 142 | + public void code(Environment env, Context ctx, Assembler asm) { | |
| 143 | + if (updater == null) { | |
| 144 | + // Field is directly accessible. | |
| 145 | + left.codeLValue(env, ctx, asm); | |
| 146 | + right.codeValue(env, ctx, asm); | |
| 147 | + left.codeStore(env, ctx, asm); | |
| 148 | + } else { | |
| 149 | + // Must use access method. | |
| 150 | + // Left operand is always a 'FieldExpression', or | |
| 151 | + // is rewritten as one via 'implementation'. | |
| 152 | + updater.startAssign(env, ctx, asm); | |
| 153 | + right.codeValue(env, ctx, asm); | |
| 154 | + updater.finishAssign(env, ctx, asm, false); | |
| 155 | + } | |
| 156 | + } | |
| 157 | +} | |