# HG changeset patch # User mcimadamore # Date 1441032620 -3600 # Node ID 8eebd1f0b8ea69e33f7bb51af997008bdd02faf2 # Parent 3c9f5bd909ae7187f24622ee4b69f8a5756a9271 8134007: Improve string folding Summary: Generalize string folding algorithm to detect mulitple groups of foldable constants within an concat expression Reviewed-by: jlahoda diff -r 3c9f5bd909ae -r 8eebd1f0b8ea langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java --- a/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java Wed Jul 05 20:47:29 2017 +0200 +++ b/langtools/src/jdk.compiler/share/classes/com/sun/tools/javac/parser/JavacParser.java Mon Aug 31 15:50:20 2015 +0100 @@ -26,6 +26,7 @@ package com.sun.tools.javac.parser; import java.util.*; +import java.util.stream.Collectors; import com.sun.source.tree.MemberReferenceTree.ReferenceMode; @@ -510,7 +511,7 @@ if (mods != 0) { long lowestMod = mods & -mods; error(token.pos, "mod.not.allowed.here", - Flags.asFlagSet(lowestMod)); + Flags.asFlagSet(lowestMod)); } } @@ -946,10 +947,7 @@ t = odStack[0]; if (t.hasTag(JCTree.Tag.PLUS)) { - StringBuilder buf = foldStrings(t); - if (buf != null) { - t = toP(F.at(startPos).Literal(TypeTag.CLASS, buf.toString())); - } + t = foldStrings(t); } odStackSupply.add(odStack); @@ -973,37 +971,76 @@ /** If tree is a concatenation of string literals, replace it * by a single literal representing the concatenated string. */ - protected StringBuilder foldStrings(JCTree tree) { + protected JCExpression foldStrings(JCExpression tree) { if (!allowStringFolding) return null; - List buf = List.nil(); + ListBuffer opStack = new ListBuffer<>(); + ListBuffer litBuf = new ListBuffer<>(); + boolean needsFolding = false; + JCExpression curr = tree; while (true) { - if (tree.hasTag(LITERAL)) { - JCLiteral lit = (JCLiteral) tree; - if (lit.typetag == TypeTag.CLASS) { - StringBuilder sbuf = - new StringBuilder((String)lit.value); - while (buf.nonEmpty()) { - sbuf.append(buf.head); - buf = buf.tail; - } - return sbuf; - } - } else if (tree.hasTag(JCTree.Tag.PLUS)) { - JCBinary op = (JCBinary)tree; - if (op.rhs.hasTag(LITERAL)) { - JCLiteral lit = (JCLiteral) op.rhs; - if (lit.typetag == TypeTag.CLASS) { - buf = buf.prepend((String) lit.value); - tree = op.lhs; - continue; - } - } + if (curr.hasTag(JCTree.Tag.PLUS)) { + JCBinary op = (JCBinary)curr; + needsFolding |= foldIfNeeded(op.rhs, litBuf, opStack, false); + curr = op.lhs; + } else { + needsFolding |= foldIfNeeded(curr, litBuf, opStack, true); + break; //last one! } - return null; + } + if (needsFolding) { + List ops = opStack.toList(); + JCExpression res = ops.head; + for (JCExpression op : ops.tail) { + res = F.at(op.getStartPosition()).Binary(optag(TokenKind.PLUS), res, op); + storeEnd(res, getEndPos(op)); + } + return res; + } else { + return tree; } } + private boolean foldIfNeeded(JCExpression tree, ListBuffer litBuf, + ListBuffer opStack, boolean last) { + JCLiteral str = stringLiteral(tree); + if (str != null) { + litBuf.prepend(str); + return last && merge(litBuf, opStack); + } else { + boolean res = merge(litBuf, opStack); + litBuf.clear(); + opStack.prepend(tree); + return res; + } + } + + boolean merge(ListBuffer litBuf, ListBuffer opStack) { + if (litBuf.isEmpty()) { + return false; + } else if (litBuf.size() == 1) { + opStack.prepend(litBuf.first()); + return false; + } else { + JCExpression t = F.at(litBuf.first().getStartPosition()).Literal(TypeTag.CLASS, + litBuf.stream().map(lit -> (String)lit.getValue()).collect(Collectors.joining())); + storeEnd(t, litBuf.last().getEndPosition(endPosTable)); + opStack.prepend(t); + return true; + } + } + + private JCLiteral stringLiteral(JCTree tree) { + if (tree.hasTag(LITERAL)) { + JCLiteral lit = (JCLiteral)tree; + if (lit.typetag == TypeTag.CLASS) { + return lit; + } + } + return null; + } + + /** optimization: To save allocating a new operand/operator stack * for every binary operation, we use supplys. */ diff -r 3c9f5bd909ae -r 8eebd1f0b8ea langtools/test/tools/javac/parser/8134007/T8134007.java --- /dev/null Thu Jan 01 00:00:00 1970 +0000 +++ b/langtools/test/tools/javac/parser/8134007/T8134007.java Mon Aug 31 15:50:20 2015 +0100 @@ -0,0 +1,488 @@ +/* + * Copyright (c) 2015, Oracle and/or its affiliates. All rights reserved. + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. + * + * This code is free software; you can redistribute it and/or modify it + * under the terms of the GNU General Public License version 2 only, as + * published by the Free Software Foundation. + * + * This code is distributed in the hope that it will be useful, but WITHOUT + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License + * version 2 for more details (a copy is included in the LICENSE file that + * accompanied this code). + * + * You should have received a copy of the GNU General Public License version + * 2 along with this work; if not, write to the Free Software Foundation, + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. + * + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA + * or visit www.oracle.com if you need additional information or have any + * questions. + */ + +/* + * @test + * @bug 8134007 + * @summary Improve string folding + * @compile T8134007.java + */ +class T8134007 { + String v = ""; + + //interleaved non-literals + String s1 = "Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + "Str5" + "Str6" + "Str7" + "Str8" + "Str9" + v + +"Str0" + "Str1" + "Str2" + "Str3" + "Str4" + 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