Mercurial > hg > truffle
view src/share/vm/runtime/fieldType.cpp @ 1145:e018e6884bd8
6631166: CMS: better heuristics when combatting fragmentation
Summary: Autonomic per-worker free block cache sizing, tunable coalition policies, fixes to per-size block statistics, retuned gain and bandwidth of some feedback loop filters to allow quicker reactivity to abrupt changes in ambient demand, and other heuristics to reduce fragmentation of the CMS old gen. Also tightened some assertions, including those related to locking.
Reviewed-by: jmasa
author | ysr |
---|---|
date | Wed, 23 Dec 2009 09:23:54 -0800 |
parents | a61af66fc99e |
children | c18cbe5936b8 |
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/* * Copyright 1997-2000 Sun Microsystems, Inc. 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 Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, * CA 95054 USA or visit www.sun.com if you need additional information or * have any questions. * */ # include "incls/_precompiled.incl" # include "incls/_fieldType.cpp.incl" void FieldType::skip_optional_size(symbolOop signature, int* index) { jchar c = signature->byte_at(*index); while (c >= '0' && c <= '9') { *index = *index + 1; c = signature->byte_at(*index); } } BasicType FieldType::basic_type(symbolOop signature) { return char2type(signature->byte_at(0)); } // Check if it is a valid array signature bool FieldType::is_valid_array_signature(symbolOop sig) { assert(sig->utf8_length() > 1, "this should already have been checked"); assert(sig->byte_at(0) == '[', "this should already have been checked"); // The first character is already checked int i = 1; int len = sig->utf8_length(); // First skip all '['s while(i < len - 1 && sig->byte_at(i) == '[') i++; // Check type switch(sig->byte_at(i)) { case 'B': // T_BYTE case 'C': // T_CHAR case 'D': // T_DOUBLE case 'F': // T_FLOAT case 'I': // T_INT case 'J': // T_LONG case 'S': // T_SHORT case 'Z': // T_BOOLEAN // If it is an array, the type is the last character return (i + 1 == len); case 'L': // If it is an object, the last character must be a ';' return sig->byte_at(len - 1) == ';'; } return false; } BasicType FieldType::get_array_info(symbolOop signature, jint* dimension, symbolOop* object_key, TRAPS) { assert(basic_type(signature) == T_ARRAY, "must be array"); int index = 1; int dim = 1; skip_optional_size(signature, &index); while (signature->byte_at(index) == '[') { index++; dim++; skip_optional_size(signature, &index); } ResourceMark rm; symbolOop element = oopFactory::new_symbol(signature->as_C_string() + index, CHECK_(T_BYTE)); BasicType element_type = FieldType::basic_type(element); if (element_type == T_OBJECT) { char* object_type = element->as_C_string(); object_type[element->utf8_length() - 1] = '\0'; *object_key = oopFactory::new_symbol(object_type + 1, CHECK_(T_BYTE)); } // Pass dimension back to caller *dimension = dim; return element_type; }