hotspot/src/share/vm/oops/symbol.cpp
author coleenp
Thu, 27 Jan 2011 16:11:27 -0800
changeset 8076 96d498ec7ae1
parent 7397 hotspot/src/share/vm/oops/symbolOop.cpp@5b173b4ca846
child 8921 14bfe81f2a9d
permissions -rw-r--r--
6990754: Use native memory and reference counting to implement SymbolTable Summary: move symbols from permgen into C heap and reference count them Reviewed-by: never, acorn, jmasa, stefank
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/*
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 * Copyright (c) 1997, 2009, Oracle and/or its affiliates. All rights reserved.
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 *
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 * This code is free software; you can redistribute it and/or modify it
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 * under the terms of the GNU General Public License version 2 only, as
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 * published by the Free Software Foundation.
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 *
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 * This code is distributed in the hope that it will be useful, but WITHOUT
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 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * accompanied this code).
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 *
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 * You should have received a copy of the GNU General Public License version
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 * 2 along with this work; if not, write to the Free Software Foundation,
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 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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 *
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 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
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 * or visit www.oracle.com if you need additional information or have any
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 * questions.
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 *
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 */
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#include "precompiled.hpp"
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#include "oops/oop.inline.hpp"
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#include "oops/symbol.hpp"
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#include "runtime/os.hpp"
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#include "memory/allocation.inline.hpp"
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Symbol::Symbol(const u1* name, int length) : _refcount(0), _length(length) {
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  _identity_hash = os::random();
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  for (int i = 0; i < _length; i++) {
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    byte_at_put(i, name[i]);
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  }
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}
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void* Symbol::operator new(size_t size, int len) {
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  return (void *) AllocateHeap(object_size(len) * HeapWordSize, "symbol");
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}
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// ------------------------------------------------------------------
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// Symbol::equals
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//
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// Compares the symbol with a string of the given length.
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bool Symbol::equals(const char* str, int len) const {
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  int l = utf8_length();
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  if (l != len) return false;
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  while (l-- > 0) {
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    if (str[l] != (char) byte_at(l))
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      return false;
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  }
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  assert(l == -1, "we should be at the beginning");
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  return true;
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}
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// ------------------------------------------------------------------
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// Symbol::starts_with
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//
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// Tests if the symbol starts with the specified prefix of the given
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// length.
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bool Symbol::starts_with(const char* prefix, int len) const {
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  if (len > utf8_length()) return false;
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  while (len-- > 0) {
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    if (prefix[len] != (char) byte_at(len))
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      return false;
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  }
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  assert(len == -1, "we should be at the beginning");
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  return true;
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}
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// ------------------------------------------------------------------
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// Symbol::index_of
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//
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// Finds if the given string is a substring of this symbol's utf8 bytes.
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// Return -1 on failure.  Otherwise return the first index where str occurs.
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int Symbol::index_of_at(int i, const char* str, int len) const {
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  assert(i >= 0 && i <= utf8_length(), "oob");
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  if (len <= 0)  return 0;
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  char first_char = str[0];
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  address bytes = (address) ((Symbol*)this)->base();
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  address limit = bytes + utf8_length() - len;  // inclusive limit
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  address scan = bytes + i;
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  if (scan > limit)
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    return -1;
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  for (;;) {
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    scan = (address) memchr(scan, first_char, (limit + 1 - scan));
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    if (scan == NULL)
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      return -1;  // not found
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    assert(scan >= bytes+i && scan <= limit, "scan oob");
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    if (memcmp(scan, str, len) == 0)
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      return (int)(scan - bytes);
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  }
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}
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char* Symbol::as_C_string(char* buf, int size) const {
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  if (size > 0) {
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    int len = MIN2(size - 1, utf8_length());
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    for (int i = 0; i < len; i++) {
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      buf[i] = byte_at(i);
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    }
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    buf[len] = '\0';
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  }
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  return buf;
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}
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char* Symbol::as_C_string() const {
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  int len = utf8_length();
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  char* str = NEW_RESOURCE_ARRAY(char, len + 1);
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  return as_C_string(str, len + 1);
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}
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char* Symbol::as_C_string_flexible_buffer(Thread* t,
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                                                 char* buf, int size) const {
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  char* str;
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  int len = utf8_length();
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  int buf_len = len + 1;
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  if (size < buf_len) {
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    str = NEW_RESOURCE_ARRAY(char, buf_len);
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  } else {
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    str = buf;
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  }
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  return as_C_string(str, buf_len);
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}
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void Symbol::print_symbol_on(outputStream* st) const {
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  st = st ? st : tty;
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  int length = UTF8::unicode_length((const char*)bytes(), utf8_length());
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  const char *ptr = (const char *)bytes();
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  jchar value;
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  for (int index = 0; index < length; index++) {
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    ptr = UTF8::next(ptr, &value);
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    if (value >= 32 && value < 127 || value == '\'' || value == '\\') {
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      st->put(value);
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    } else {
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      st->print("\\u%04x", value);
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    }
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  }
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}
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jchar* Symbol::as_unicode(int& length) const {
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  Symbol* this_ptr = (Symbol*)this;
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  length = UTF8::unicode_length((char*)this_ptr->bytes(), utf8_length());
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  jchar* result = NEW_RESOURCE_ARRAY(jchar, length);
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  if (length > 0) {
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    UTF8::convert_to_unicode((char*)this_ptr->bytes(), result, length);
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  }
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  return result;
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}
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const char* Symbol::as_klass_external_name(char* buf, int size) const {
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  if (size > 0) {
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    char* str    = as_C_string(buf, size);
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    int   length = (int)strlen(str);
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    // Turn all '/'s into '.'s (also for array klasses)
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    for (int index = 0; index < length; index++) {
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      if (str[index] == '/') {
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        str[index] = '.';
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      }
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    }
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    return str;
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  } else {
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    return buf;
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  }
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}
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const char* Symbol::as_klass_external_name() const {
1
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  char* str    = as_C_string();
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  int   length = (int)strlen(str);
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  // Turn all '/'s into '.'s (also for array klasses)
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  for (int index = 0; index < length; index++) {
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    if (str[index] == '/') {
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      str[index] = '.';
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    }
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  }
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  return str;
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}
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void Symbol::print_on(outputStream* st) const {
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  if (this == NULL) {
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    st->print_cr("NULL");
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  } else {
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    st->print("Symbol: '");
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    print_symbol_on(st);
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    st->print("'");
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    st->print(" count %d", refcount());
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  }
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}
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// The print_value functions are present in all builds, to support the
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// disassembler and error reporting.
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void Symbol::print_value_on(outputStream* st) const {
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  if (this == NULL) {
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    st->print("NULL");
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  } else {
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    st->print("'");
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    for (int i = 0; i < utf8_length(); i++) {
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      st->print("%c", byte_at(i));
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    }
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    st->print("'");
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  }
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}
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void Symbol::increment_refcount() {
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  // Only increment the refcount if positive.  If negative either
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  // overflow has occurred or it is a permanent symbol in a read only
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  // shared archive.
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  if (_refcount >= 0) {
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    Atomic::inc(&_refcount);
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    NOT_PRODUCT(Atomic::inc(&_total_count);)
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  }
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}
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void Symbol::decrement_refcount() {
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  if (_refcount >= 0) {
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    Atomic::dec(&_refcount);
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#ifdef ASSERT
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    if (_refcount < 0) {
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      print();
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      assert(false, "reference count underflow for symbol");
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    }
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#endif
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  }
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}
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NOT_PRODUCT(int Symbol::_total_count = 0;)