Showing the changes to java/pkg/sun/tools/tree/IncDecExpression.java (1 of 18352 files). Show all
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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.util.Hashtable; | ||
| 31 | |||
| 32 | /** | ||
| 33 | * WARNING: The contents of this source file are not part of any | ||
| 34 | * supported API. Code that depends on them does so at its own risk: | ||
| 35 | * they are subject to change or removal without notice. | ||
| 36 | */ | ||
| 37 | public | ||
| 38 | class IncDecExpression extends UnaryExpression { | ||
| 39 | |||
| 40 | private FieldUpdater updater = null; | ||
| 41 | |||
| 42 | /** | ||
| 43 | * Constructor | ||
| 44 | */ | ||
| 45 | public IncDecExpression(int op, long where, Expression right) { | ||
| 46 | super(op, where, right.type, right); | ||
| 47 | } | ||
| 48 | |||
| 49 | /** | ||
| 50 | * Check an increment or decrement expression | ||
| 51 | */ | ||
| 52 | public Vset checkValue(Environment env, Context ctx, Vset vset, Hashtable exp) { | ||
| 53 | vset = right.checkAssignOp(env, ctx, vset, exp, this); | ||
| 54 | if (right.type.inMask(TM_NUMBER)) { | ||
| 55 | type = right.type; | ||
| 56 | } else { | ||
| 57 | if (!right.type.isType(TC_ERROR)) { | ||
| 58 | env.error(where, "invalid.arg.type", right.type, opNames[op]); | ||
| 59 | } | ||
| 60 | type = Type.tError; | ||
| 61 | } | ||
| 62 | updater = right.getUpdater(env, ctx); // Must be called after 'checkAssignOp'. | ||
| 63 | return vset; | ||
| 64 | } | ||
| 65 | |||
| 66 | /** | ||
| 67 | * Check void expression | ||
| 68 | */ | ||
| 69 | public Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) { | ||
| 70 | return checkValue(env, ctx, vset, exp); | ||
| 71 | } | ||
| 72 | |||
| 73 | /** | ||
| 74 | * Inline | ||
| 75 | */ | ||
| 76 | public Expression inline(Environment env, Context ctx) { | ||
| 77 | return inlineValue(env, ctx); | ||
| 78 | } | ||
| 79 | public Expression inlineValue(Environment env, Context ctx) { | ||
| 80 | // Why not inlineLHS? But that does not work. | ||
| 81 | right = right.inlineValue(env, ctx); | ||
| 82 | if (updater != null) { | ||
| 83 | updater = updater.inline(env, ctx); | ||
| 84 | } | ||
| 85 | return this; | ||
| 86 | } | ||
| 87 | |||
| 88 | public int costInline(int thresh, Environment env, Context ctx) { | ||
| 89 | if (updater == null) { | ||
| 90 | if ((right.op == IDENT) && type.isType(TC_INT) && | ||
| 91 | (((IdentifierExpression)right).field.isLocal())) { | ||
| 92 | // Increment variable in place. Count 3 bytes for 'iinc'. | ||
| 93 | return 3; | ||
| 94 | } | ||
| 95 | // Cost to load lhs reference, fetch local, increment, and store. | ||
| 96 | // Load/store cost will be higher if variable is a field. Note that | ||
| 97 | // costs are highly approximate. See 'AssignOpExpression.costInline' | ||
| 98 | // Does not account for cost of conversions,or duplications in | ||
| 99 | // value-needed context.. | ||
| 100 | return right.costInline(thresh, env, ctx) + 4; | ||
| 101 | } else { | ||
| 102 | // Cost of two access method calls (get/set) + cost of increment. | ||
| 103 | return updater.costInline(thresh, env, ctx, true) + 1; | ||
| 104 | } | ||
| 105 | } | ||
| 106 | |||
| 107 | |||
| 108 | /** | ||
| 109 | * Code | ||
| 110 | */ | ||
| 111 | |||
| 112 | private void codeIncDecOp(Assembler asm, boolean inc) { | ||
| 113 | switch (type.getTypeCode()) { | ||
| 114 | case TC_BYTE: | ||
| 115 | asm.add(where, opc_ldc, new Integer(1)); | ||
| 116 | asm.add(where, inc ? opc_iadd : opc_isub); | ||
| 117 | asm.add(where, opc_i2b); | ||
| 118 | break; | ||
| 119 | case TC_SHORT: | ||
| 120 | asm.add(where, opc_ldc, new Integer(1)); | ||
| 121 | asm.add(where, inc ? opc_iadd : opc_isub); | ||
| 122 | asm.add(where, opc_i2s); | ||
| 123 | break; | ||
| 124 | case TC_CHAR: | ||
| 125 | asm.add(where, opc_ldc, new Integer(1)); | ||
| 126 | asm.add(where, inc ? opc_iadd : opc_isub); | ||
| 127 | asm.add(where, opc_i2c); | ||
| 128 | break; | ||
| 129 | case TC_INT: | ||
| 130 | asm.add(where, opc_ldc, new Integer(1)); | ||
| 131 | asm.add(where, inc ? opc_iadd : opc_isub); | ||
| 132 | break; | ||
| 133 | case TC_LONG: | ||
| 134 | asm.add(where, opc_ldc2_w, new Long(1)); | ||
| 135 | asm.add(where, inc ? opc_ladd : opc_lsub); | ||
| 136 | break; | ||
| 137 | case TC_FLOAT: | ||
| 138 | asm.add(where, opc_ldc, new Float(1)); | ||
| 139 | asm.add(where, inc ? opc_fadd : opc_fsub); | ||
| 140 | break; | ||
| 141 | case TC_DOUBLE: | ||
| 142 | asm.add(where, opc_ldc2_w, new Double(1)); | ||
| 143 | asm.add(where, inc ? opc_dadd : opc_dsub); | ||
| 144 | break; | ||
| 145 | default: | ||
| 146 | throw new CompilerError("invalid type"); | ||
| 147 | } | ||
| 148 | } | ||
| 149 | |||
| 150 | void codeIncDec(Environment env, Context ctx, Assembler asm, boolean inc, boolean prefix, boolean valNeeded) { | ||
| 151 | |||
| 152 | // The 'iinc' instruction cannot be used if an access method call is required. | ||
| 153 | if ((right.op == IDENT) && type.isType(TC_INT) && | ||
| 154 | (((IdentifierExpression)right).field.isLocal()) && updater == null) { | ||
| 155 | if (valNeeded && !prefix) { | ||
| 156 | right.codeLoad(env, ctx, asm); | ||
| 157 | } | ||
| 158 | int v = ((LocalMember)((IdentifierExpression)right).field).number; | ||
| 159 | int[] operands = { v, inc ? 1 : -1 }; | ||
| 160 | asm.add(where, opc_iinc, operands); | ||
| 161 | if (valNeeded && prefix) { | ||
| 162 | right.codeLoad(env, ctx, asm); | ||
| 163 | } | ||
| 164 | return; | ||
| 165 | |||
| 166 | } | ||
| 167 | |||
| 168 | if (updater == null) { | ||
| 169 | // Field is directly accessible. | ||
| 170 | int depth = right.codeLValue(env, ctx, asm); | ||
| 171 | codeDup(env, ctx, asm, depth, 0); | ||
| 172 | right.codeLoad(env, ctx, asm); | ||
| 173 | if (valNeeded && !prefix) { | ||
| 174 | codeDup(env, ctx, asm, type.stackSize(), depth); | ||
| 175 | } | ||
| 176 | codeIncDecOp(asm, inc); | ||
| 177 | if (valNeeded && prefix) { | ||
| 178 | codeDup(env, ctx, asm, type.stackSize(), depth); | ||
| 179 | } | ||
| 180 | right.codeStore(env, ctx, asm); | ||
| 181 | } else { | ||
| 182 | // Must use access methods. | ||
| 183 | updater.startUpdate(env, ctx, asm, (valNeeded && !prefix)); | ||
| 184 | codeIncDecOp(asm, inc); | ||
| 185 | updater.finishUpdate(env, ctx, asm, (valNeeded && prefix)); | ||
| 186 | } | ||
| 187 | } | ||
| 188 | |||
| 189 | } | ||