606 lines
21 KiB
C
606 lines
21 KiB
C
/*
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** Compile and run this standalone program in order to generate code that
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** implements a function that will translate alphabetic identifiers into
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** parser token codes.
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*/
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#include <stdio.h>
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#include <string.h>
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#include <stdlib.h>
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#include <assert.h>
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/*
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** A header comment placed at the beginning of generated code.
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*/
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static const char zHdr[] =
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"/***** This file contains automatically generated code ******\n"
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"**\n"
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"** The code in this file has been automatically generated by\n"
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"**\n"
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"** sqlite/tool/mkkeywordhash.c\n"
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"**\n"
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"** The code in this file implements a function that determines whether\n"
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"** or not a given identifier is really an SQL keyword. The same thing\n"
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"** might be implemented more directly using a hand-written hash table.\n"
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"** But by using this automatically generated code, the size of the code\n"
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"** is substantially reduced. This is important for embedded applications\n"
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"** on platforms with limited memory.\n"
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"*/\n"
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;
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/*
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** All the keywords of the SQL language are stored in a hash
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** table composed of instances of the following structure.
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*/
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typedef struct Keyword Keyword;
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struct Keyword {
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char *zName; /* The keyword name */
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char *zTokenType; /* Token value for this keyword */
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int mask; /* Code this keyword if non-zero */
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int id; /* Unique ID for this record */
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int hash; /* Hash on the keyword */
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int offset; /* Offset to start of name string */
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int len; /* Length of this keyword, not counting final \000 */
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int prefix; /* Number of characters in prefix */
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int longestSuffix; /* Longest suffix that is a prefix on another word */
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int iNext; /* Index in aKeywordTable[] of next with same hash */
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int substrId; /* Id to another keyword this keyword is embedded in */
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int substrOffset; /* Offset into substrId for start of this keyword */
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char zOrigName[20]; /* Original keyword name before processing */
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};
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/*
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** Define masks used to determine which keywords are allowed
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*/
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#ifdef SQLITE_OMIT_ALTERTABLE
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# define ALTER 0
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#else
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# define ALTER 0x00000001
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#endif
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#define ALWAYS 0x00000002
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#ifdef SQLITE_OMIT_ANALYZE
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# define ANALYZE 0
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#else
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# define ANALYZE 0x00000004
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#endif
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#ifdef SQLITE_OMIT_ATTACH
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# define ATTACH 0
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#else
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# define ATTACH 0x00000008
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#endif
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#ifdef SQLITE_OMIT_AUTOINCREMENT
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# define AUTOINCR 0
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#else
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# define AUTOINCR 0x00000010
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#endif
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#ifdef SQLITE_OMIT_CAST
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# define CAST 0
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#else
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# define CAST 0x00000020
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#endif
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#ifdef SQLITE_OMIT_COMPOUND_SELECT
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# define COMPOUND 0
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#else
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# define COMPOUND 0x00000040
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#endif
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#ifdef SQLITE_OMIT_CONFLICT_CLAUSE
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# define CONFLICT 0
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#else
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# define CONFLICT 0x00000080
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#endif
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#ifdef SQLITE_OMIT_EXPLAIN
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# define EXPLAIN 0
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#else
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# define EXPLAIN 0x00000100
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#endif
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#ifdef SQLITE_OMIT_FOREIGN_KEY
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# define FKEY 0
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#else
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# define FKEY 0x00000200
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#endif
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#ifdef SQLITE_OMIT_PRAGMA
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# define PRAGMA 0
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#else
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# define PRAGMA 0x00000400
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#endif
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#ifdef SQLITE_OMIT_REINDEX
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# define REINDEX 0
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#else
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# define REINDEX 0x00000800
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#endif
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#ifdef SQLITE_OMIT_SUBQUERY
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# define SUBQUERY 0
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#else
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# define SUBQUERY 0x00001000
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#endif
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#ifdef SQLITE_OMIT_TRIGGER
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# define TRIGGER 0
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#else
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# define TRIGGER 0x00002000
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#endif
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#if defined(SQLITE_OMIT_AUTOVACUUM) && \
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(defined(SQLITE_OMIT_VACUUM) || defined(SQLITE_OMIT_ATTACH))
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# define VACUUM 0
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#else
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# define VACUUM 0x00004000
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#endif
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#ifdef SQLITE_OMIT_VIEW
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# define VIEW 0
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#else
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# define VIEW 0x00008000
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#endif
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#ifdef SQLITE_OMIT_VIRTUALTABLE
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# define VTAB 0
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#else
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# define VTAB 0x00010000
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#endif
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#ifdef SQLITE_OMIT_AUTOVACUUM
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# define AUTOVACUUM 0
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#else
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# define AUTOVACUUM 0x00020000
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#endif
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#ifdef SQLITE_OMIT_CTE
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# define CTE 0
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#else
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# define CTE 0x00040000
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#endif
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/*
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** These are the keywords
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*/
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static Keyword aKeywordTable[] = {
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{ "ABORT", "TK_ABORT", CONFLICT|TRIGGER },
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{ "ACTION", "TK_ACTION", FKEY },
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{ "ADD", "TK_ADD", ALTER },
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{ "AFTER", "TK_AFTER", TRIGGER },
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{ "ALL", "TK_ALL", ALWAYS },
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{ "ALTER", "TK_ALTER", ALTER },
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{ "ANALYZE", "TK_ANALYZE", ANALYZE },
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{ "AND", "TK_AND", ALWAYS },
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{ "AS", "TK_AS", ALWAYS },
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{ "ASC", "TK_ASC", ALWAYS },
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{ "ATTACH", "TK_ATTACH", ATTACH },
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{ "AUTOINCREMENT", "TK_AUTOINCR", AUTOINCR },
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{ "BEFORE", "TK_BEFORE", TRIGGER },
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{ "BEGIN", "TK_BEGIN", ALWAYS },
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{ "BETWEEN", "TK_BETWEEN", ALWAYS },
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{ "BY", "TK_BY", ALWAYS },
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{ "CASCADE", "TK_CASCADE", FKEY },
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{ "CASE", "TK_CASE", ALWAYS },
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{ "CAST", "TK_CAST", CAST },
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{ "CHECK", "TK_CHECK", ALWAYS },
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{ "COLLATE", "TK_COLLATE", ALWAYS },
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{ "COLUMN", "TK_COLUMNKW", ALTER },
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{ "COMMIT", "TK_COMMIT", ALWAYS },
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{ "CONFLICT", "TK_CONFLICT", CONFLICT },
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{ "CONSTRAINT", "TK_CONSTRAINT", ALWAYS },
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{ "CREATE", "TK_CREATE", ALWAYS },
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{ "CROSS", "TK_JOIN_KW", ALWAYS },
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{ "CURRENT_DATE", "TK_CTIME_KW", ALWAYS },
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{ "CURRENT_TIME", "TK_CTIME_KW", ALWAYS },
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{ "CURRENT_TIMESTAMP","TK_CTIME_KW", ALWAYS },
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{ "DATABASE", "TK_DATABASE", ATTACH },
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{ "DEFAULT", "TK_DEFAULT", ALWAYS },
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{ "DEFERRED", "TK_DEFERRED", ALWAYS },
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{ "DEFERRABLE", "TK_DEFERRABLE", FKEY },
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{ "DELETE", "TK_DELETE", ALWAYS },
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{ "DESC", "TK_DESC", ALWAYS },
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{ "DETACH", "TK_DETACH", ATTACH },
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{ "DISTINCT", "TK_DISTINCT", ALWAYS },
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{ "DROP", "TK_DROP", ALWAYS },
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{ "END", "TK_END", ALWAYS },
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{ "EACH", "TK_EACH", TRIGGER },
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{ "ELSE", "TK_ELSE", ALWAYS },
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{ "ESCAPE", "TK_ESCAPE", ALWAYS },
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{ "EXCEPT", "TK_EXCEPT", COMPOUND },
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{ "EXCLUSIVE", "TK_EXCLUSIVE", ALWAYS },
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{ "EXISTS", "TK_EXISTS", ALWAYS },
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{ "EXPLAIN", "TK_EXPLAIN", EXPLAIN },
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{ "FAIL", "TK_FAIL", CONFLICT|TRIGGER },
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{ "FOR", "TK_FOR", TRIGGER },
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{ "FOREIGN", "TK_FOREIGN", FKEY },
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{ "FROM", "TK_FROM", ALWAYS },
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{ "FULL", "TK_JOIN_KW", ALWAYS },
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{ "GLOB", "TK_LIKE_KW", ALWAYS },
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{ "GROUP", "TK_GROUP", ALWAYS },
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{ "HAVING", "TK_HAVING", ALWAYS },
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{ "IF", "TK_IF", ALWAYS },
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{ "IGNORE", "TK_IGNORE", CONFLICT|TRIGGER },
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{ "IMMEDIATE", "TK_IMMEDIATE", ALWAYS },
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{ "IN", "TK_IN", ALWAYS },
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{ "INDEX", "TK_INDEX", ALWAYS },
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{ "INDEXED", "TK_INDEXED", ALWAYS },
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{ "INITIALLY", "TK_INITIALLY", FKEY },
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{ "INNER", "TK_JOIN_KW", ALWAYS },
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{ "INSERT", "TK_INSERT", ALWAYS },
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{ "INSTEAD", "TK_INSTEAD", TRIGGER },
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{ "INTERSECT", "TK_INTERSECT", COMPOUND },
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{ "INTO", "TK_INTO", ALWAYS },
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{ "IS", "TK_IS", ALWAYS },
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{ "ISNULL", "TK_ISNULL", ALWAYS },
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{ "JOIN", "TK_JOIN", ALWAYS },
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{ "KEY", "TK_KEY", ALWAYS },
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{ "LEFT", "TK_JOIN_KW", ALWAYS },
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{ "LIKE", "TK_LIKE_KW", ALWAYS },
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{ "LIMIT", "TK_LIMIT", ALWAYS },
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{ "MATCH", "TK_MATCH", ALWAYS },
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{ "NATURAL", "TK_JOIN_KW", ALWAYS },
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{ "NO", "TK_NO", FKEY },
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{ "NOT", "TK_NOT", ALWAYS },
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{ "NOTNULL", "TK_NOTNULL", ALWAYS },
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{ "NULL", "TK_NULL", ALWAYS },
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{ "OF", "TK_OF", ALWAYS },
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{ "OFFSET", "TK_OFFSET", ALWAYS },
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{ "ON", "TK_ON", ALWAYS },
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{ "OR", "TK_OR", ALWAYS },
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{ "ORDER", "TK_ORDER", ALWAYS },
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{ "OUTER", "TK_JOIN_KW", ALWAYS },
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{ "PLAN", "TK_PLAN", EXPLAIN },
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{ "PRAGMA", "TK_PRAGMA", PRAGMA },
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{ "PRIMARY", "TK_PRIMARY", ALWAYS },
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{ "QUERY", "TK_QUERY", EXPLAIN },
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{ "RAISE", "TK_RAISE", TRIGGER },
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{ "RECURSIVE", "TK_RECURSIVE", CTE },
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{ "REFERENCES", "TK_REFERENCES", FKEY },
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{ "REGEXP", "TK_LIKE_KW", ALWAYS },
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{ "REINDEX", "TK_REINDEX", REINDEX },
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{ "RELEASE", "TK_RELEASE", ALWAYS },
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{ "RENAME", "TK_RENAME", ALTER },
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{ "REPLACE", "TK_REPLACE", CONFLICT },
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{ "RESTRICT", "TK_RESTRICT", FKEY },
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{ "RIGHT", "TK_JOIN_KW", ALWAYS },
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{ "ROLLBACK", "TK_ROLLBACK", ALWAYS },
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{ "ROW", "TK_ROW", TRIGGER },
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{ "SAVEPOINT", "TK_SAVEPOINT", ALWAYS },
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{ "SELECT", "TK_SELECT", ALWAYS },
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{ "SET", "TK_SET", ALWAYS },
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{ "TABLE", "TK_TABLE", ALWAYS },
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{ "TEMP", "TK_TEMP", ALWAYS },
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{ "TEMPORARY", "TK_TEMP", ALWAYS },
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{ "THEN", "TK_THEN", ALWAYS },
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{ "TO", "TK_TO", ALWAYS },
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{ "TRANSACTION", "TK_TRANSACTION", ALWAYS },
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{ "TRIGGER", "TK_TRIGGER", TRIGGER },
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{ "UNION", "TK_UNION", COMPOUND },
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{ "UNIQUE", "TK_UNIQUE", ALWAYS },
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{ "UPDATE", "TK_UPDATE", ALWAYS },
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{ "USING", "TK_USING", ALWAYS },
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{ "VACUUM", "TK_VACUUM", VACUUM },
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{ "VALUES", "TK_VALUES", ALWAYS },
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{ "VIEW", "TK_VIEW", VIEW },
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{ "VIRTUAL", "TK_VIRTUAL", VTAB },
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{ "WITH", "TK_WITH", CTE },
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{ "WITHOUT", "TK_WITHOUT", ALWAYS },
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{ "WHEN", "TK_WHEN", ALWAYS },
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{ "WHERE", "TK_WHERE", ALWAYS },
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};
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/* Number of keywords */
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static int nKeyword = (sizeof(aKeywordTable)/sizeof(aKeywordTable[0]));
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/* Map all alphabetic characters into lower-case for hashing. This is
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** only valid for alphabetics. In particular it does not work for '_'
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** and so the hash cannot be on a keyword position that might be an '_'.
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*/
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#define charMap(X) (0x20|(X))
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/*
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** Comparision function for two Keyword records
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*/
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static int keywordCompare1(const void *a, const void *b){
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const Keyword *pA = (Keyword*)a;
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const Keyword *pB = (Keyword*)b;
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int n = pA->len - pB->len;
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if( n==0 ){
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n = strcmp(pA->zName, pB->zName);
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}
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assert( n!=0 );
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return n;
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}
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static int keywordCompare2(const void *a, const void *b){
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const Keyword *pA = (Keyword*)a;
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const Keyword *pB = (Keyword*)b;
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int n = pB->longestSuffix - pA->longestSuffix;
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if( n==0 ){
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n = strcmp(pA->zName, pB->zName);
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}
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assert( n!=0 );
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return n;
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}
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static int keywordCompare3(const void *a, const void *b){
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const Keyword *pA = (Keyword*)a;
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const Keyword *pB = (Keyword*)b;
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int n = pA->offset - pB->offset;
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if( n==0 ) n = pB->id - pA->id;
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assert( n!=0 );
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return n;
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}
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/*
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** Return a KeywordTable entry with the given id
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*/
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static Keyword *findById(int id){
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int i;
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for(i=0; i<nKeyword; i++){
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if( aKeywordTable[i].id==id ) break;
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}
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return &aKeywordTable[i];
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}
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/*
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** This routine does the work. The generated code is printed on standard
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** output.
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*/
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int main(int argc, char **argv){
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int i, j, k, h;
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int bestSize, bestCount;
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int count;
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int nChar;
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int totalLen = 0;
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int aHash[1000]; /* 1000 is much bigger than nKeyword */
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char zText[2000];
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/* Remove entries from the list of keywords that have mask==0 */
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for(i=j=0; i<nKeyword; i++){
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if( aKeywordTable[i].mask==0 ) continue;
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if( j<i ){
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aKeywordTable[j] = aKeywordTable[i];
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}
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j++;
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}
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nKeyword = j;
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/* Fill in the lengths of strings and hashes for all entries. */
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for(i=0; i<nKeyword; i++){
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Keyword *p = &aKeywordTable[i];
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p->len = (int)strlen(p->zName);
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assert( p->len<sizeof(p->zOrigName) );
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memcpy(p->zOrigName, p->zName, p->len+1);
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totalLen += p->len;
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p->hash = (charMap(p->zName[0])*4) ^
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(charMap(p->zName[p->len-1])*3) ^ (p->len*1);
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p->id = i+1;
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}
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/* Sort the table from shortest to longest keyword */
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qsort(aKeywordTable, nKeyword, sizeof(aKeywordTable[0]), keywordCompare1);
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/* Look for short keywords embedded in longer keywords */
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for(i=nKeyword-2; i>=0; i--){
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Keyword *p = &aKeywordTable[i];
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for(j=nKeyword-1; j>i && p->substrId==0; j--){
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Keyword *pOther = &aKeywordTable[j];
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if( pOther->substrId ) continue;
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if( pOther->len<=p->len ) continue;
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for(k=0; k<=pOther->len-p->len; k++){
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if( memcmp(p->zName, &pOther->zName[k], p->len)==0 ){
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p->substrId = pOther->id;
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p->substrOffset = k;
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break;
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}
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}
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}
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}
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/* Compute the longestSuffix value for every word */
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for(i=0; i<nKeyword; i++){
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Keyword *p = &aKeywordTable[i];
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if( p->substrId ) continue;
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for(j=0; j<nKeyword; j++){
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Keyword *pOther;
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if( j==i ) continue;
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pOther = &aKeywordTable[j];
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if( pOther->substrId ) continue;
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for(k=p->longestSuffix+1; k<p->len && k<pOther->len; k++){
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if( memcmp(&p->zName[p->len-k], pOther->zName, k)==0 ){
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p->longestSuffix = k;
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}
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}
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}
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}
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/* Sort the table into reverse order by length */
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qsort(aKeywordTable, nKeyword, sizeof(aKeywordTable[0]), keywordCompare2);
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/* Fill in the offset for all entries */
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nChar = 0;
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for(i=0; i<nKeyword; i++){
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Keyword *p = &aKeywordTable[i];
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if( p->offset>0 || p->substrId ) continue;
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p->offset = nChar;
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nChar += p->len;
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for(k=p->len-1; k>=1; k--){
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for(j=i+1; j<nKeyword; j++){
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Keyword *pOther = &aKeywordTable[j];
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if( pOther->offset>0 || pOther->substrId ) continue;
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if( pOther->len<=k ) continue;
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if( memcmp(&p->zName[p->len-k], pOther->zName, k)==0 ){
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p = pOther;
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p->offset = nChar - k;
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nChar = p->offset + p->len;
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p->zName += k;
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p->len -= k;
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p->prefix = k;
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j = i;
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k = p->len;
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}
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}
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}
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}
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for(i=0; i<nKeyword; i++){
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Keyword *p = &aKeywordTable[i];
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if( p->substrId ){
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p->offset = findById(p->substrId)->offset + p->substrOffset;
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}
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}
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/* Sort the table by offset */
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qsort(aKeywordTable, nKeyword, sizeof(aKeywordTable[0]), keywordCompare3);
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/* Figure out how big to make the hash table in order to minimize the
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** number of collisions */
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bestSize = nKeyword;
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bestCount = nKeyword*nKeyword;
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for(i=nKeyword/2; i<=2*nKeyword; i++){
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for(j=0; j<i; j++) aHash[j] = 0;
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for(j=0; j<nKeyword; j++){
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h = aKeywordTable[j].hash % i;
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aHash[h] *= 2;
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aHash[h]++;
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}
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for(j=count=0; j<i; j++) count += aHash[j];
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if( count<bestCount ){
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bestCount = count;
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bestSize = i;
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}
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}
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/* Compute the hash */
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for(i=0; i<bestSize; i++) aHash[i] = 0;
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for(i=0; i<nKeyword; i++){
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h = aKeywordTable[i].hash % bestSize;
|
|
aKeywordTable[i].iNext = aHash[h];
|
|
aHash[h] = i+1;
|
|
}
|
|
|
|
/* Begin generating code */
|
|
printf("%s", zHdr);
|
|
printf("/* Hash score: %d */\n", bestCount);
|
|
printf("static int keywordCode(const char *z, int n, int *pType){\n");
|
|
printf(" /* zText[] encodes %d bytes of keywords in %d bytes */\n",
|
|
totalLen + nKeyword, nChar+1 );
|
|
for(i=j=k=0; i<nKeyword; i++){
|
|
Keyword *p = &aKeywordTable[i];
|
|
if( p->substrId ) continue;
|
|
memcpy(&zText[k], p->zName, p->len);
|
|
k += p->len;
|
|
if( j+p->len>70 ){
|
|
printf("%*s */\n", 74-j, "");
|
|
j = 0;
|
|
}
|
|
if( j==0 ){
|
|
printf(" /* ");
|
|
j = 8;
|
|
}
|
|
printf("%s", p->zName);
|
|
j += p->len;
|
|
}
|
|
if( j>0 ){
|
|
printf("%*s */\n", 74-j, "");
|
|
}
|
|
printf(" static const char zText[%d] = {\n", nChar);
|
|
zText[nChar] = 0;
|
|
for(i=j=0; i<k; i++){
|
|
if( j==0 ){
|
|
printf(" ");
|
|
}
|
|
if( zText[i]==0 ){
|
|
printf("0");
|
|
}else{
|
|
printf("'%c',", zText[i]);
|
|
}
|
|
j += 4;
|
|
if( j>68 ){
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
if( j>0 ) printf("\n");
|
|
printf(" };\n");
|
|
|
|
printf(" static const unsigned char aHash[%d] = {\n", bestSize);
|
|
for(i=j=0; i<bestSize; i++){
|
|
if( j==0 ) printf(" ");
|
|
printf(" %3d,", aHash[i]);
|
|
j++;
|
|
if( j>12 ){
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
printf("%s };\n", j==0 ? "" : "\n");
|
|
|
|
printf(" static const unsigned char aNext[%d] = {\n", nKeyword);
|
|
for(i=j=0; i<nKeyword; i++){
|
|
if( j==0 ) printf(" ");
|
|
printf(" %3d,", aKeywordTable[i].iNext);
|
|
j++;
|
|
if( j>12 ){
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
printf("%s };\n", j==0 ? "" : "\n");
|
|
|
|
printf(" static const unsigned char aLen[%d] = {\n", nKeyword);
|
|
for(i=j=0; i<nKeyword; i++){
|
|
if( j==0 ) printf(" ");
|
|
printf(" %3d,", aKeywordTable[i].len+aKeywordTable[i].prefix);
|
|
j++;
|
|
if( j>12 ){
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
printf("%s };\n", j==0 ? "" : "\n");
|
|
|
|
printf(" static const unsigned short int aOffset[%d] = {\n", nKeyword);
|
|
for(i=j=0; i<nKeyword; i++){
|
|
if( j==0 ) printf(" ");
|
|
printf(" %3d,", aKeywordTable[i].offset);
|
|
j++;
|
|
if( j>12 ){
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
printf("%s };\n", j==0 ? "" : "\n");
|
|
|
|
printf(" static const unsigned char aCode[%d] = {\n", nKeyword);
|
|
for(i=j=0; i<nKeyword; i++){
|
|
char *zToken = aKeywordTable[i].zTokenType;
|
|
if( j==0 ) printf(" ");
|
|
printf("%s,%*s", zToken, (int)(14-strlen(zToken)), "");
|
|
j++;
|
|
if( j>=5 ){
|
|
printf("\n");
|
|
j = 0;
|
|
}
|
|
}
|
|
printf("%s };\n", j==0 ? "" : "\n");
|
|
|
|
printf(" int i, j;\n");
|
|
printf(" const char *zKW;\n");
|
|
printf(" if( n>=2 ){\n");
|
|
printf(" i = ((charMap(z[0])*4) ^ (charMap(z[n-1])*3) ^ n) %% %d;\n",
|
|
bestSize);
|
|
printf(" for(i=((int)aHash[i])-1; i>=0; i=((int)aNext[i])-1){\n");
|
|
printf(" if( aLen[i]!=n ) continue;\n");
|
|
printf(" j = 0;\n");
|
|
printf(" zKW = &zText[aOffset[i]];\n");
|
|
printf("#ifdef SQLITE_ASCII\n");
|
|
printf(" while( j<n && (z[j]&~0x20)==zKW[j] ){ j++; }\n");
|
|
printf("#endif\n");
|
|
printf("#ifdef SQLITE_EBCDIC\n");
|
|
printf(" while( j<n && toupper(z[j])==zKW[j] ){ j++; }\n");
|
|
printf("#endif\n");
|
|
printf(" if( j<n ) continue;\n");
|
|
for(i=0; i<nKeyword; i++){
|
|
printf(" testcase( i==%d ); /* %s */\n",
|
|
i, aKeywordTable[i].zOrigName);
|
|
}
|
|
printf(" *pType = aCode[i];\n");
|
|
printf(" break;\n");
|
|
printf(" }\n");
|
|
printf(" }\n");
|
|
printf(" return n;\n");
|
|
printf("}\n");
|
|
printf("int sqlite3KeywordCode(const unsigned char *z, int n){\n");
|
|
printf(" int id = TK_ID;\n");
|
|
printf(" keywordCode((char*)z, n, &id);\n");
|
|
printf(" return id;\n");
|
|
printf("}\n");
|
|
printf("#define SQLITE_N_KEYWORD %d\n", nKeyword);
|
|
|
|
return 0;
|
|
}
|