2362N/A * Copyright (c) 1994, 2003, Oracle and/or its affiliates. All rights reserved. 0N/A * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 0N/A * This code is free software; you can redistribute it and/or modify it 0N/A * under the terms of the GNU General Public License version 2 only, as 2362N/A * published by the Free Software Foundation. Oracle designates this 0N/A * particular file as subject to the "Classpath" exception as provided 2362N/A * by Oracle in the LICENSE file that accompanied this code. 0N/A * This code is distributed in the hope that it will be useful, but WITHOUT 0N/A * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 0N/A * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 0N/A * version 2 for more details (a copy is included in the LICENSE file that 0N/A * accompanied this code). 0N/A * You should have received a copy of the GNU General Public License version 0N/A * 2 along with this work; if not, write to the Free Software Foundation, 0N/A * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 2362N/A * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 2362N/A * or visit www.oracle.com if you need additional information or have any 0N/A * WARNING: The contents of this source file are not part of any 0N/A * supported API. Code that depends on them does so at its own risk: 0N/A * they are subject to change or removal without notice. 0N/A // Vset vsExtra = vset.copy(); // See comment below. 0N/A // The following code, now deleted, was apparently an erroneous attempt 0N/A // at providing better error diagnostics. The comment read: 'If either 0N/A // the true clause or the false clause is unreachable, do a reasonable 0N/A // check on the child anyway.' 0N/A // Vset vsTrue = cvars.vsTrue.isDeadEnd() ? vsExtra : cvars.vsTrue; 0N/A // Vset vsFalse = cvars.vsFalse.isDeadEnd() ? vsExtra : cvars.vsFalse; 0N/A // Unfortunately, this violates the rules laid out in the JLS, and leads to 0N/A // blatantly incorrect results. For example, 'i' will not be recognized 0N/A // as definitely assigned following the statement 'if (true) i = 1;'. 0N/A // It is best to slavishly follow the JLS here. A cleverer approach could 0N/A // only correctly issue warnings, as JLS 16.2.6 is quite explicit, and it 0N/A // is OK for a dead branch of an if-statement to omit an assignment that 0N/A // would be required in the other branch. A complication: This code also 0N/A // had the effect of implementing the special-case rules for 'if-then' and 0N/A // 'if-then-else' in JLS 14.19, "Unreachable Statements". We now use 0N/A // 'Vset.clearDeadEnd' to remove the dead-end status of unreachable branches 0N/A // without affecting the definite-assignment status of the variables, thus 0N/A // maintaining a correct implementation of JLS 16.2.6. Fixes 4094353. 0N/A // Note that the code below will not consider the branches unreachable if 0N/A // the entire statement is unreachable. This is consistent with the error 0N/A // recovery policy that reports the only the first unreachable statement 0N/A // along an acyclic execution path. 0N/A // The compiler currently needs to perform inlining on both 0N/A // branches of the if statement -- even if `cond' is a constant 0N/A // true or false. Why? The compiler will later try to compile 0N/A // all classes that it has seen; this includes classes that 0N/A // appear in dead code. If we don't inline the dead branch here 0N/A // then the compiler will never perform inlining on any local 0N/A // classes appearing on the dead code. When the compiler tries 0N/A // to compile an un-inlined local class with uplevel references, 0N/A // it dies. (bug 4059492) 0N/A // A better solution to this would be to walk the dead branch and 0N/A // mark any local classes appearing therein as unneeded. Then the 0N/A // compilation phase could skip these classes. 0N/A * Create a copy of the statement for method inlining 0N/A * The cost of inlining this statement