J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 1994-2003 Sun Microsystems, Inc. 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. Sun designates this |
| 8 | * particular file as subject to the "Classpath" exception as provided |
| 9 | * by Sun 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 22 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 23 | * have any 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 DoStatement extends Statement { |
| 41 | Statement body; |
| 42 | Expression cond; |
| 43 | |
| 44 | /** |
| 45 | * Constructor |
| 46 | */ |
| 47 | public DoStatement(long where, Statement body, Expression cond) { |
| 48 | super(DO, where); |
| 49 | this.body = body; |
| 50 | this.cond = cond; |
| 51 | } |
| 52 | |
| 53 | /** |
| 54 | * Check statement |
| 55 | */ |
| 56 | Vset check(Environment env, Context ctx, Vset vset, Hashtable exp) { |
| 57 | checkLabel(env,ctx); |
| 58 | CheckContext newctx = new CheckContext(ctx, this); |
| 59 | // remember what was unassigned on entry |
| 60 | Vset vsEntry = vset.copy(); |
| 61 | vset = body.check(env, newctx, reach(env, vset), exp); |
| 62 | vset = vset.join(newctx.vsContinue); |
| 63 | // get to the test either by falling through the body, or through |
| 64 | // a "continue" statement. |
| 65 | ConditionVars cvars = |
| 66 | cond.checkCondition(env, newctx, vset, exp); |
| 67 | cond = convert(env, newctx, Type.tBoolean, cond); |
| 68 | // make sure the back-branch fits the entry of the loop |
| 69 | ctx.checkBackBranch(env, this, vsEntry, cvars.vsTrue); |
| 70 | // exit the loop through the test returning false, or a "break" |
| 71 | vset = newctx.vsBreak.join(cvars.vsFalse); |
| 72 | return ctx.removeAdditionalVars(vset); |
| 73 | } |
| 74 | |
| 75 | /** |
| 76 | * Inline |
| 77 | */ |
| 78 | public Statement inline(Environment env, Context ctx) { |
| 79 | ctx = new Context(ctx, this); |
| 80 | if (body != null) { |
| 81 | body = body.inline(env, ctx); |
| 82 | } |
| 83 | cond = cond.inlineValue(env, ctx); |
| 84 | return this; |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Create a copy of the statement for method inlining |
| 89 | */ |
| 90 | public Statement copyInline(Context ctx, boolean valNeeded) { |
| 91 | DoStatement s = (DoStatement)clone(); |
| 92 | s.cond = cond.copyInline(ctx); |
| 93 | if (body != null) { |
| 94 | s.body = body.copyInline(ctx, valNeeded); |
| 95 | } |
| 96 | return s; |
| 97 | } |
| 98 | |
| 99 | /** |
| 100 | * The cost of inlining this statement |
| 101 | */ |
| 102 | public int costInline(int thresh, Environment env, Context ctx) { |
| 103 | return 1 + cond.costInline(thresh, env, ctx) |
| 104 | + ((body != null) ? body.costInline(thresh, env, ctx) : 0); |
| 105 | } |
| 106 | |
| 107 | /** |
| 108 | * Code |
| 109 | */ |
| 110 | public void code(Environment env, Context ctx, Assembler asm) { |
| 111 | Label l1 = new Label(); |
| 112 | asm.add(l1); |
| 113 | |
| 114 | CodeContext newctx = new CodeContext(ctx, this); |
| 115 | |
| 116 | if (body != null) { |
| 117 | body.code(env, newctx, asm); |
| 118 | } |
| 119 | asm.add(newctx.contLabel); |
| 120 | cond.codeBranch(env, newctx, asm, l1, true); |
| 121 | asm.add(newctx.breakLabel); |
| 122 | } |
| 123 | |
| 124 | /** |
| 125 | * Print |
| 126 | */ |
| 127 | public void print(PrintStream out, int indent) { |
| 128 | super.print(out, indent); |
| 129 | out.print("do "); |
| 130 | body.print(out, indent); |
| 131 | out.print(" while "); |
| 132 | cond.print(out); |
| 133 | out.print(";"); |
| 134 | } |
| 135 | } |