src/global.c

   1 /*
   2 ** 2008 June 13
   3 **
   4 ** The author disclaims copyright to this source code.  In place of
   5 ** a legal notice, here is a blessing:
   6 **
   7 **    May you do good and not evil.
   8 **    May you find forgiveness for yourself and forgive others.
   9 **    May you share freely, never taking more than you give.
  10 **
  11 *************************************************************************
  12 **
  13 ** This file contains definitions of global variables and constants.
  14 */
  15 #include "sqliteInt.h"
  16
  17 /* An array to map all upper-case characters into their corresponding
  18 ** lower-case character.
  19 **
  20 ** SQLite only considers US-ASCII (or EBCDIC) characters.  We do not
  21 ** handle case conversions for the UTF character set since the tables
  22 ** involved are nearly as big or bigger than SQLite itself.
  23 */
  24 const unsigned char sqlite3UpperToLower[] = {
  25 #ifdef SQLITE_ASCII
  26       0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, 16, 17,
  27      18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, 32, 33, 34, 35,
  28      36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, 48, 49, 50, 51, 52, 53,
  29      54, 55, 56, 57, 58, 59, 60, 61, 62, 63, 64, 97, 98, 99,100,101,102,103,
  30     104,105,106,107,108,109,110,111,112,113,114,115,116,117,118,119,120,121,
  31     122, 91, 92, 93, 94, 95, 96, 97, 98, 99,100,101,102,103,104,105,106,107,
  32     108,109,110,111,112,113,114,115,116,117,118,119,120,121,122,123,124,125,
  33     126,127,128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143,
  34     144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159,160,161,
  35     162,163,164,165,166,167,168,169,170,171,172,173,174,175,176,177,178,179,
  36     180,181,182,183,184,185,186,187,188,189,190,191,192,193,194,195,196,197,
  37     198,199,200,201,202,203,204,205,206,207,208,209,210,211,212,213,214,215,
  38     216,217,218,219,220,221,222,223,224,225,226,227,228,229,230,231,232,233,
  39     234,235,236,237,238,239,240,241,242,243,244,245,246,247,248,249,250,251,
  40     252,253,254,255
  41 #endif
  42 #ifdef SQLITE_EBCDIC
  43       0,  1,  2,  3,  4,  5,  6,  7,  8,  9, 10, 11, 12, 13, 14, 15, /* 0x */
  44      16, 17, 18, 19, 20, 21, 22, 23, 24, 25, 26, 27, 28, 29, 30, 31, /* 1x */
  45      32, 33, 34, 35, 36, 37, 38, 39, 40, 41, 42, 43, 44, 45, 46, 47, /* 2x */
  46      48, 49, 50, 51, 52, 53, 54, 55, 56, 57, 58, 59, 60, 61, 62, 63, /* 3x */
  47      64, 65, 66, 67, 68, 69, 70, 71, 72, 73, 74, 75, 76, 77, 78, 79, /* 4x */
  48      80, 81, 82, 83, 84, 85, 86, 87, 88, 89, 90, 91, 92, 93, 94, 95, /* 5x */
  49      96, 97, 98, 99,100,101,102,103,104,105,106,107,108,109,110,111, /* 6x */
  50     112,113,114,115,116,117,118,119,120,121,122,123,124,125,126,127, /* 7x */
  51     128,129,130,131,132,133,134,135,136,137,138,139,140,141,142,143, /* 8x */
  52     144,145,146,147,148,149,150,151,152,153,154,155,156,157,158,159, /* 9x */
  53     160,161,162,163,164,165,166,167,168,169,170,171,140,141,142,175, /* Ax */
  54     176,177,178,179,180,181,182,183,184,185,186,187,188,189,190,191, /* Bx */
  55     192,129,130,131,132,133,134,135,136,137,202,203,204,205,206,207, /* Cx */
  56     208,145,146,147,148,149,150,151,152,153,218,219,220,221,222,223, /* Dx */
  57     224,225,162,163,164,165,166,167,168,169,234,235,236,237,238,239, /* Ex */
  58     240,241,242,243,244,245,246,247,248,249,250,251,252,253,254,255, /* Fx */
  59 #endif
  60 };
  61
  62 /*
  63 ** The following 256 byte lookup table is used to support SQLites built-in
  64 ** equivalents to the following standard library functions:
  65 **
  66 **   isspace()                        0x01
  67 **   isalpha()                        0x02
  68 **   isdigit()                        0x04
  69 **   isalnum()                        0x06
  70 **   isxdigit()                       0x08
  71 **   toupper()                        0x20
  72 **   SQLite identifier character      0x40
  73 **   Quote character                  0x80
  74 **
  75 ** Bit 0x20 is set if the mapped character requires translation to upper
  76 ** case. i.e. if the character is a lower-case ASCII character.
  77 ** If x is a lower-case ASCII character, then its upper-case equivalent
  78 ** is (x - 0x20). Therefore toupper() can be implemented as:
  79 **
  80 **   (x & ~(map[x]&0x20))
  81 **
  82 ** The equivalent of tolower() is implemented using the sqlite3UpperToLower[]
  83 ** array. tolower() is used more often than toupper() by SQLite.
  84 **
  85 ** Bit 0x40 is set if the character is non-alphanumeric and can be used in an
  86 ** SQLite identifier.  Identifiers are alphanumerics, "_", "$", and any
  87 ** non-ASCII UTF character. Hence the test for whether or not a character is
  88 ** part of an identifier is 0x46.
  89 */
  90 #ifdef SQLITE_ASCII
  91 const unsigned char sqlite3CtypeMap[256] = {
  92   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 00..07    ........ */
  93   0x00, 0x01, 0x01, 0x01, 0x01, 0x01, 0x00, 0x00,  /* 08..0f    ........ */
  94   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 10..17    ........ */
  95   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 18..1f    ........ */
  96   0x01, 0x00, 0x80, 0x00, 0x40, 0x00, 0x00, 0x80,  /* 20..27     !"#$%&' */
  97   0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 28..2f    ()*+,-./ */
  98   0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c, 0x0c,  /* 30..37    01234567 */
  99   0x0c, 0x0c, 0x00, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 38..3f    89:;<=>? */
 100
 101   0x00, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x0a, 0x02,  /* 40..47    @ABCDEFG */
 102   0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  /* 48..4f    HIJKLMNO */
 103   0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02, 0x02,  /* 50..57    PQRSTUVW */
 104   0x02, 0x02, 0x02, 0x80, 0x00, 0x00, 0x00, 0x40,  /* 58..5f    XYZ[\]^_ */
 105   0x80, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x2a, 0x22,  /* 60..67    `abcdefg */
 106   0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,  /* 68..6f    hijklmno */
 107   0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22, 0x22,  /* 70..77    pqrstuvw */
 108   0x22, 0x22, 0x22, 0x00, 0x00, 0x00, 0x00, 0x00,  /* 78..7f    xyz{|}~. */
 109
 110   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 80..87    ........ */
 111   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 88..8f    ........ */
 112   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 90..97    ........ */
 113   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* 98..9f    ........ */
 114   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* a0..a7    ........ */
 115   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* a8..af    ........ */
 116   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* b0..b7    ........ */
 117   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* b8..bf    ........ */
 118
 119   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* c0..c7    ........ */
 120   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* c8..cf    ........ */
 121   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* d0..d7    ........ */
 122   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* d8..df    ........ */
 123   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* e0..e7    ........ */
 124   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* e8..ef    ........ */
 125   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40,  /* f0..f7    ........ */
 126   0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40, 0x40   /* f8..ff    ........ */
 127 };
 128 #endif
 129
 130 /* EVIDENCE-OF: R-02982-34736 In order to maintain full backwards
 131 ** compatibility for legacy applications, the URI filename capability is
 132 ** disabled by default.
 133 **
 134 ** EVIDENCE-OF: R-38799-08373 URI filenames can be enabled or disabled
 135 ** using the SQLITE_USE_URI=1 or SQLITE_USE_URI=0 compile-time options.
 136 **
 137 ** EVIDENCE-OF: R-43642-56306 By default, URI handling is globally
 138 ** disabled. The default value may be changed by compiling with the
 139 ** SQLITE_USE_URI symbol defined.
 140 **
 141 ** URI filenames are enabled by default if SQLITE_HAS_CODEC is
 142 ** enabled.
 143 */
 144 #ifndef SQLITE_USE_URI
 145 # ifdef SQLITE_HAS_CODEC
 146 #  define SQLITE_USE_URI 1
 147 # else
 148 #  define SQLITE_USE_URI 0
 149 # endif
 150 #endif
 151
 152 /* EVIDENCE-OF: R-38720-18127 The default setting is determined by the
 153 ** SQLITE_ALLOW_COVERING_INDEX_SCAN compile-time option, or is "on" if
 154 ** that compile-time option is omitted.
 155 */
 156 #ifndef SQLITE_ALLOW_COVERING_INDEX_SCAN
 157 # define SQLITE_ALLOW_COVERING_INDEX_SCAN 1
 158 #endif
 159
 160 /* The minimum PMA size is set to this value multiplied by the database
 161 ** page size in bytes.
 162 */
 163 #ifndef SQLITE_SORTER_PMASZ
 164 # define SQLITE_SORTER_PMASZ 250
 165 #endif
 166
 167 /* Statement journals spill to disk when their size exceeds the following
 168 ** threshold (in bytes). 0 means that statement journals are created and
 169 ** written to disk immediately (the default behavior for SQLite versions
 170 ** before 3.12.0).  -1 means always keep the entire statement journal in
 171 ** memory.  (The statement journal is also always held entirely in memory
 172 ** if journal_mode=MEMORY or if temp_store=MEMORY, regardless of this
 173 ** setting.)
 174 */
 175 #ifndef SQLITE_STMTJRNL_SPILL
 176 # define SQLITE_STMTJRNL_SPILL (64*1024)
 177 #endif
 178
 179 /*
 180 ** The default lookaside-configuration, the format "SZ,N".  SZ is the
 181 ** number of bytes in each lookaside slot (should be a multiple of 8)
 182 ** and N is the number of slots.  The lookaside-configuration can be
 183 ** changed as start-time using sqlite3_config(SQLITE_CONFIG_LOOKASIDE)
 184 ** or at run-time for an individual database connection using
 185 ** sqlite3_db_config(db, SQLITE_DBCONFIG_LOOKASIDE);
 186 */
 187 #ifndef SQLITE_DEFAULT_LOOKASIDE
 188 # define SQLITE_DEFAULT_LOOKASIDE 1200,100
 189 #endif
 190
 191
 192 /*
 193 ** The following singleton contains the global configuration for
 194 ** the SQLite library.
 195 */
 196 SQLITE_WSD struct Sqlite3Config sqlite3Config = {
 197    SQLITE_DEFAULT_MEMSTATUS,  /* bMemstat */
 198    1,                         /* bCoreMutex */
 199    SQLITE_THREADSAFE==1,      /* bFullMutex */
 200    SQLITE_USE_URI,            /* bOpenUri */
 201    SQLITE_ALLOW_COVERING_INDEX_SCAN,   /* bUseCis */
 202    0,                         /* bSmallMalloc */
 203    0x7ffffffe,                /* mxStrlen */
 204    0,                         /* neverCorrupt */
 205    SQLITE_DEFAULT_LOOKASIDE,  /* szLookaside, nLookaside */
 206    SQLITE_STMTJRNL_SPILL,     /* nStmtSpill */
 207    {0,0,0,0,0,0,0,0},         /* m */
 208    {0,0,0,0,0,0,0,0,0},       /* mutex */
 209    {0,0,0,0,0,0,0,0,0,0,0,0,0},/* pcache2 */
 210    (void*)0,                  /* pHeap */
 211    0,                         /* nHeap */
 212    0, 0,                      /* mnHeap, mxHeap */
 213    SQLITE_DEFAULT_MMAP_SIZE,  /* szMmap */
 214    SQLITE_MAX_MMAP_SIZE,      /* mxMmap */
 215    (void*)0,                  /* pPage */
 216    0,                         /* szPage */
 217    SQLITE_DEFAULT_PCACHE_INITSZ, /* nPage */
 218    0,                         /* mxParserStack */
 219    0,                         /* sharedCacheEnabled */
 220    SQLITE_SORTER_PMASZ,       /* szPma */
 221    /* All the rest should always be initialized to zero */
 222    0,                         /* isInit */
 223    0,                         /* inProgress */
 224    0,                         /* isMutexInit */
 225    0,                         /* isMallocInit */
 226    0,                         /* isPCacheInit */
 227    0,                         /* nRefInitMutex */
 228    0,                         /* pInitMutex */
 229    0,                         /* xLog */
 230    0,                         /* pLogArg */
 231 #ifdef SQLITE_ENABLE_SQLLOG
 232    0,                         /* xSqllog */
 233    0,                         /* pSqllogArg */
 234 #endif
 235 #ifdef SQLITE_VDBE_COVERAGE
 236    0,                         /* xVdbeBranch */
 237    0,                         /* pVbeBranchArg */
 238 #endif
 239 #ifndef SQLITE_UNTESTABLE
 240    0,                         /* xTestCallback */
 241 #endif
 242    0,                         /* bLocaltimeFault */
 243    0x7ffffffe                 /* iOnceResetThreshold */
 244 };
 245
 246 /*
 247 ** Hash table for global functions - functions common to all
 248 ** database connections.  After initialization, this table is
 249 ** read-only.
 250 */
 251 FuncDefHash sqlite3BuiltinFunctions;
 252
 253 /*
 254 ** Constant tokens for values 0 and 1.
 255 */
 256 const Token sqlite3IntTokens[] = {
 257    { "0", 1 },
 258    { "1", 1 }
 259 };
 260
 261 #ifdef VDBE_PROFILE
 262 /*
 263 ** The following performance counter can be used in place of
 264 ** sqlite3Hwtime() for profiling.  This is a no-op on standard builds.
 265 */
 266 sqlite3_uint64 sqlite3NProfileCnt = 0;
 267 #endif
 268
 269 /*
 270 ** The value of the "pending" byte must be 0x40000000 (1 byte past the
 271 ** 1-gibabyte boundary) in a compatible database.  SQLite never uses
 272 ** the database page that contains the pending byte.  It never attempts
 273 ** to read or write that page.  The pending byte page is set aside
 274 ** for use by the VFS layers as space for managing file locks.
 275 **
 276 ** During testing, it is often desirable to move the pending byte to
 277 ** a different position in the file.  This allows code that has to
 278 ** deal with the pending byte to run on files that are much smaller
 279 ** than 1 GiB.  The sqlite3_test_control() interface can be used to
 280 ** move the pending byte.
 281 **
 282 ** IMPORTANT:  Changing the pending byte to any value other than
 283 ** 0x40000000 results in an incompatible database file format!
 284 ** Changing the pending byte during operation will result in undefined
 285 ** and incorrect behavior.
 286 */
 287 #ifndef SQLITE_OMIT_WSD
 288 int sqlite3PendingByte = 0x40000000;
 289 #endif
 290
 291 #include "opcodes.h"
 292 /*
 293 ** Properties of opcodes.  The OPFLG_INITIALIZER macro is
 294 ** created by mkopcodeh.awk during compilation.  Data is obtained
 295 ** from the comments following the "case OP_xxxx:" statements in
 296 ** the vdbe.c file.
 297 */
 298 const unsigned char sqlite3OpcodeProperty[] = OPFLG_INITIALIZER;
 299
 300 /*
 301 ** Name of the default collating sequence
 302 */
 303 const char sqlite3StrBINARY[] = "BINARY";