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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 | } | ||