sal/rtl/strimp.cxx

   1 /* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
   2 /*
   3  * This file is part of the LibreOffice project.
   4  *
   5  * This Source Code Form is subject to the terms of the Mozilla Public
   6  * License, v. 2.0. If a copy of the MPL was not distributed with this
   7  * file, You can obtain one at http://mozilla.org/MPL/2.0/.
   8  *
   9  * This file incorporates work covered by the following license notice:
  10  *
  11  *   Licensed to the Apache Software Foundation (ASF) under one or more
  12  *   contributor license agreements. See the NOTICE file distributed
  13  *   with this work for additional information regarding copyright
  14  *   ownership. The ASF licenses this file to you under the Apache
  15  *   License, Version 2.0 (the "License"); you may not use this file
  16  *   except in compliance with the License. You may obtain a copy of
  17  *   the License at http://www.apache.org/licenses/LICENSE-2.0 .
  18  */
  19 #include <sal/config.h>
  20
  21 #include <assert.h>
  22 #include <rtl/alloc.h>
  23 #include <rtl/ustring.h>
  24 #include <rtllifecycle.h>
  25
  26 #include "strimp.hxx"
  27 #include "alloc_impl.hxx"
  28 #include "alloc_arena.hxx"
  29
  30 sal_Int16 rtl_ImplGetDigit( sal_Unicode ch, sal_Int16 nRadix )
  31 {
  32     sal_Int16 n = -1;
  33     if ( (ch >= '0') && (ch <= '9') )
  34         n = ch-'0';
  35     else if ( (ch >= 'a') && (ch <= 'z') )
  36         n = ch-'a'+10;
  37     else if ( (ch >= 'A') && (ch <= 'Z') )
  38         n = ch-'A'+10;
  39     return (n < nRadix) ? n : -1;
  40 }
  41
  42 bool rtl_ImplIsWhitespace( sal_Unicode c )
  43 {
  44     /* Space or Control character? */
  45     if ( (c <= 32) && c )
  46         return true;
  47
  48     /* Only in the General Punctuation area Space or Control characters are included? */
  49     if ( (c < 0x2000) || (c > 0x206F) )
  50         return false;
  51
  52     if ( ((c >= 0x2000) && (c <= 0x200B)) ||    /* All Spaces           */
  53          (c == 0x2028) ||                       /* LINE SEPARATOR       */
  54          (c == 0x2029) )                        /* PARAGRAPH SEPARATOR  */
  55         return true;
  56
  57     return false;
  58 }
  59
  60 /*
  61  * TODO: add a slower, more awful, but more space efficient
  62  * custom allocator for the pre-init phase. Existing slab
  63  * allocator's minimum alloc size is 24bytes, and by default
  64  * is 32 bytes.
  65  */
  66 static rtl_arena_type *pre_arena = nullptr;
  67
  68 rtl_allocateStringFn rtl_allocateString = malloc;
  69 rtl_freeStringFn rtl_freeString = free;
  70
  71 extern "C" {
  72 static void *pre_allocateStringFn(size_t n)
  73 {
  74     sal_Size size = RTL_MEMORY_ALIGN(n + 4, 4);
  75     char *addr = static_cast<char*>(rtl_arena_alloc(pre_arena, &size));
  76     assert(size>= 12);
  77     reinterpret_cast<sal_uInt32*>(addr)[0] = size - 12;
  78     return addr + 4;
  79 }
  80
  81 static void pre_freeStringFn(void *data)
  82 {
  83     char    *addr = static_cast<char*>(data) - 4;
  84     sal_uInt32 size = reinterpret_cast<sal_uInt32*>(addr)[0] + 12;
  85
  86     rtl_arena_free(pre_arena, addr, size);
  87 }
  88 } // extern "C"
  89
  90 static void mark_static(void *addr, sal_Size /* size */)
  91 {
  92     char *inner = static_cast<char*>(addr) + 4;
  93     rtl_uString *str = reinterpret_cast<rtl_uString *>(inner);
  94     str->refCount |= SAL_STRING_STATIC_FLAG;
  95 }
  96
  97 void SAL_CALL rtl_alloc_preInit (sal_Bool start) SAL_THROW_EXTERN_C()
  98 {
  99     if (start)
 100     {
 101         rtl_allocateString = pre_allocateStringFn;
 102         rtl_freeString = pre_freeStringFn;
 103         pre_arena = rtl_arena_create("pre-init strings", 4, 0,
 104                                      nullptr, rtl_arena_alloc,
 105                                      rtl_arena_free, 0);
 106
 107         // To be consistent (and to ensure the rtl_cache threads are started).
 108         ensureCacheSingleton();
 109     }
 110     else
 111     {
 112         rtl_arena_foreach(pre_arena, mark_static);
 113         rtl_allocateString = malloc;
 114         rtl_freeString = free;
 115
 116         // TODO: also re-initialize main allocator as well.
 117     }
 118 }
 119
 120 /* vim:set shiftwidth=4 softtabstop=4 expandtab: */