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Overview
| Comment: | Slightly faster keyword hash table. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
f12e743e19a04ecbf7eb69b675082f2e |
| User & Date: | drh 2019-11-01 02:30:54 |
Context
|
2019-11-01
| ||
| 10:49 | Fix a potential array bounds overflow in the mkkeywordhash.c code generator. Also add marks to omit keywords specific to generated columns when building with -DSQLITE_OMIT_GENERATED_COLUMNS. (check-in: cc6a4081 user: drh tags: trunk) | |
| 02:30 | Slightly faster keyword hash table. (check-in: f12e743e user: drh tags: trunk) | |
|
2019-10-31
| ||
| 20:54 | Correctly generate pre-UPDATE content for virtual columns that are used by foreign key constraints. Ticket [b9befa4b83a660cc] (check-in: 40d3282e user: drh tags: trunk) | |
Changes
Changes to tool/mkkeywordhash.c.
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** table composed of instances of the following structure.
*/
typedef struct Keyword Keyword;
struct Keyword {
char *zName; /* The keyword name */
char *zTokenType; /* Token value for this keyword */
int mask; /* Code this keyword if non-zero */
int id; /* Unique ID for this record */
int hash; /* Hash on the keyword */
int offset; /* Offset to start of name string */
int len; /* Length of this keyword, not counting final \000 */
int prefix; /* Number of characters in prefix */
int longestSuffix; /* Longest suffix that is a prefix on another word */
int iNext; /* Index in aKeywordTable[] of next with same hash */
................................................................................
# define WINDOWFUNC 0x00100000
#endif
/*
** These are the keywords
*/
static Keyword aKeywordTable[] = {
{ "ABORT", "TK_ABORT", CONFLICT|TRIGGER },
{ "ACTION", "TK_ACTION", FKEY },
{ "ADD", "TK_ADD", ALTER },
{ "AFTER", "TK_AFTER", TRIGGER },
{ "ALL", "TK_ALL", ALWAYS },
{ "ALTER", "TK_ALTER", ALTER },
{ "ALWAYS", "TK_ALWAYS", ALWAYS },
{ "ANALYZE", "TK_ANALYZE", ANALYZE },
{ "AND", "TK_AND", ALWAYS },
{ "AS", "TK_AS", ALWAYS },
{ "ASC", "TK_ASC", ALWAYS },
{ "ATTACH", "TK_ATTACH", ATTACH },
{ "AUTOINCREMENT", "TK_AUTOINCR", AUTOINCR },
{ "BEFORE", "TK_BEFORE", TRIGGER },
{ "BEGIN", "TK_BEGIN", ALWAYS },
{ "BETWEEN", "TK_BETWEEN", ALWAYS },
{ "BY", "TK_BY", ALWAYS },
{ "CASCADE", "TK_CASCADE", FKEY },
{ "CASE", "TK_CASE", ALWAYS },
{ "CAST", "TK_CAST", CAST },
{ "CHECK", "TK_CHECK", ALWAYS },
{ "COLLATE", "TK_COLLATE", ALWAYS },
{ "COLUMN", "TK_COLUMNKW", ALTER },
{ "COMMIT", "TK_COMMIT", ALWAYS },
{ "CONFLICT", "TK_CONFLICT", CONFLICT },
{ "CONSTRAINT", "TK_CONSTRAINT", ALWAYS },
{ "CREATE", "TK_CREATE", ALWAYS },
{ "CROSS", "TK_JOIN_KW", ALWAYS },
{ "CURRENT", "TK_CURRENT", WINDOWFUNC },
{ "CURRENT_DATE", "TK_CTIME_KW", ALWAYS },
{ "CURRENT_TIME", "TK_CTIME_KW", ALWAYS },
{ "CURRENT_TIMESTAMP","TK_CTIME_KW", ALWAYS },
{ "DATABASE", "TK_DATABASE", ATTACH },
{ "DEFAULT", "TK_DEFAULT", ALWAYS },
{ "DEFERRED", "TK_DEFERRED", ALWAYS },
{ "DEFERRABLE", "TK_DEFERRABLE", FKEY },
{ "DELETE", "TK_DELETE", ALWAYS },
{ "DESC", "TK_DESC", ALWAYS },
{ "DETACH", "TK_DETACH", ATTACH },
{ "DISTINCT", "TK_DISTINCT", ALWAYS },
{ "DO", "TK_DO", UPSERT },
{ "DROP", "TK_DROP", ALWAYS },
{ "END", "TK_END", ALWAYS },
{ "EACH", "TK_EACH", TRIGGER },
{ "ELSE", "TK_ELSE", ALWAYS },
{ "ESCAPE", "TK_ESCAPE", ALWAYS },
{ "EXCEPT", "TK_EXCEPT", COMPOUND },
{ "EXCLUSIVE", "TK_EXCLUSIVE", ALWAYS },
{ "EXCLUDE", "TK_EXCLUDE", WINDOWFUNC },
{ "EXISTS", "TK_EXISTS", ALWAYS },
{ "EXPLAIN", "TK_EXPLAIN", EXPLAIN },
{ "FAIL", "TK_FAIL", CONFLICT|TRIGGER },
{ "FILTER", "TK_FILTER", WINDOWFUNC },
{ "FIRST", "TK_FIRST", ALWAYS },
{ "FOLLOWING", "TK_FOLLOWING", WINDOWFUNC },
{ "FOR", "TK_FOR", TRIGGER },
{ "FOREIGN", "TK_FOREIGN", FKEY },
{ "FROM", "TK_FROM", ALWAYS },
{ "FULL", "TK_JOIN_KW", ALWAYS },
{ "GENERATED", "TK_GENERATED", ALWAYS },
{ "GLOB", "TK_LIKE_KW", ALWAYS },
{ "GROUP", "TK_GROUP", ALWAYS },
{ "GROUPS", "TK_GROUPS", WINDOWFUNC },
{ "HAVING", "TK_HAVING", ALWAYS },
{ "IF", "TK_IF", ALWAYS },
{ "IGNORE", "TK_IGNORE", CONFLICT|TRIGGER },
{ "IMMEDIATE", "TK_IMMEDIATE", ALWAYS },
{ "IN", "TK_IN", ALWAYS },
{ "INDEX", "TK_INDEX", ALWAYS },
{ "INDEXED", "TK_INDEXED", ALWAYS },
{ "INITIALLY", "TK_INITIALLY", FKEY },
{ "INNER", "TK_JOIN_KW", ALWAYS },
{ "INSERT", "TK_INSERT", ALWAYS },
{ "INSTEAD", "TK_INSTEAD", TRIGGER },
{ "INTERSECT", "TK_INTERSECT", COMPOUND },
{ "INTO", "TK_INTO", ALWAYS },
{ "IS", "TK_IS", ALWAYS },
{ "ISNULL", "TK_ISNULL", ALWAYS },
{ "JOIN", "TK_JOIN", ALWAYS },
{ "KEY", "TK_KEY", ALWAYS },
{ "LAST", "TK_LAST", ALWAYS },
{ "LEFT", "TK_JOIN_KW", ALWAYS },
{ "LIKE", "TK_LIKE_KW", ALWAYS },
{ "LIMIT", "TK_LIMIT", ALWAYS },
{ "MATCH", "TK_MATCH", ALWAYS },
{ "NATURAL", "TK_JOIN_KW", ALWAYS },
{ "NO", "TK_NO", FKEY|WINDOWFUNC },
{ "NOT", "TK_NOT", ALWAYS },
{ "NOTHING", "TK_NOTHING", UPSERT },
{ "NOTNULL", "TK_NOTNULL", ALWAYS },
{ "NULL", "TK_NULL", ALWAYS },
{ "NULLS", "TK_NULLS", ALWAYS },
{ "OF", "TK_OF", ALWAYS },
{ "OFFSET", "TK_OFFSET", ALWAYS },
{ "ON", "TK_ON", ALWAYS },
{ "OR", "TK_OR", ALWAYS },
{ "ORDER", "TK_ORDER", ALWAYS },
{ "OTHERS", "TK_OTHERS", WINDOWFUNC },
{ "OUTER", "TK_JOIN_KW", ALWAYS },
{ "OVER", "TK_OVER", WINDOWFUNC },
{ "PARTITION", "TK_PARTITION", WINDOWFUNC },
{ "PLAN", "TK_PLAN", EXPLAIN },
{ "PRAGMA", "TK_PRAGMA", PRAGMA },
{ "PRECEDING", "TK_PRECEDING", WINDOWFUNC },
{ "PRIMARY", "TK_PRIMARY", ALWAYS },
{ "QUERY", "TK_QUERY", EXPLAIN },
{ "RAISE", "TK_RAISE", TRIGGER },
{ "RANGE", "TK_RANGE", WINDOWFUNC },
{ "RECURSIVE", "TK_RECURSIVE", CTE },
{ "REFERENCES", "TK_REFERENCES", FKEY },
{ "REGEXP", "TK_LIKE_KW", ALWAYS },
{ "REINDEX", "TK_REINDEX", REINDEX },
{ "RELEASE", "TK_RELEASE", ALWAYS },
{ "RENAME", "TK_RENAME", ALTER },
{ "REPLACE", "TK_REPLACE", CONFLICT },
{ "RESTRICT", "TK_RESTRICT", FKEY },
{ "RIGHT", "TK_JOIN_KW", ALWAYS },
{ "ROLLBACK", "TK_ROLLBACK", ALWAYS },
{ "ROW", "TK_ROW", TRIGGER },
{ "ROWS", "TK_ROWS", ALWAYS },
{ "SAVEPOINT", "TK_SAVEPOINT", ALWAYS },
{ "SELECT", "TK_SELECT", ALWAYS },
{ "SET", "TK_SET", ALWAYS },
{ "TABLE", "TK_TABLE", ALWAYS },
{ "TEMP", "TK_TEMP", ALWAYS },
{ "TEMPORARY", "TK_TEMP", ALWAYS },
{ "THEN", "TK_THEN", ALWAYS },
{ "TIES", "TK_TIES", WINDOWFUNC },
{ "TO", "TK_TO", ALWAYS },
{ "TRANSACTION", "TK_TRANSACTION", ALWAYS },
{ "TRIGGER", "TK_TRIGGER", TRIGGER },
{ "UNBOUNDED", "TK_UNBOUNDED", WINDOWFUNC },
{ "UNION", "TK_UNION", COMPOUND },
{ "UNIQUE", "TK_UNIQUE", ALWAYS },
{ "UPDATE", "TK_UPDATE", ALWAYS },
{ "USING", "TK_USING", ALWAYS },
{ "VACUUM", "TK_VACUUM", VACUUM },
{ "VALUES", "TK_VALUES", ALWAYS },
{ "VIEW", "TK_VIEW", VIEW },
{ "VIRTUAL", "TK_VIRTUAL", VTAB },
{ "WHEN", "TK_WHEN", ALWAYS },
{ "WHERE", "TK_WHERE", ALWAYS },
{ "WINDOW", "TK_WINDOW", WINDOWFUNC },
{ "WITH", "TK_WITH", CTE },
{ "WITHOUT", "TK_WITHOUT", ALWAYS },
};
/* Number of keywords */
static int nKeyword = (sizeof(aKeywordTable)/sizeof(aKeywordTable[0]));
/* Map all alphabetic characters into lower-case for hashing. This is
** only valid for alphabetics. In particular it does not work for '_'
................................................................................
static Keyword *findById(int id){
int i;
for(i=0; i<nKeyword; i++){
if( aKeywordTable[i].id==id ) break;
}
return &aKeywordTable[i];
}
/*
** This routine does the work. The generated code is printed on standard
** output.
*/
int main(int argc, char **argv){
int i, j, k, h;
................................................................................
/* Compute the hash */
for(i=0; i<bestSize; i++) aKWHash[i] = 0;
for(i=0; i<nKeyword; i++){
h = aKeywordTable[i].hash % bestSize;
aKeywordTable[i].iNext = aKWHash[h];
aKWHash[h] = i+1;
}
/* Begin generating code */
printf("%s", zHdr);
printf("/* Hash score: %d */\n", bestCount);
printf("/* zKWText[] encodes %d bytes of keyword text in %d bytes */\n",
totalLen + nKeyword, nChar+1 );
................................................................................
j++;
if( j>=5 ){
printf("\n");
j = 0;
}
}
printf("%s};\n", j==0 ? "" : "\n");
printf("/* Check to see if z[0..n-1] is a keyword. If it is, write the\n");
printf("** parser symbol code for that keyword into *pType. Always\n");
printf("** return the integer n (the length of the token). */\n");
printf("static int keywordCode(const char *z, int n, int *pType){\n");
printf(" int i, j;\n");
printf(" const char *zKW;\n");
printf(" if( n>=2 ){\n");
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** table composed of instances of the following structure.
*/
typedef struct Keyword Keyword;
struct Keyword {
char *zName; /* The keyword name */
char *zTokenType; /* Token value for this keyword */
int mask; /* Code this keyword if non-zero */
int priority; /* Put higher priorities earlier in the hash chain */
int id; /* Unique ID for this record */
int hash; /* Hash on the keyword */
int offset; /* Offset to start of name string */
int len; /* Length of this keyword, not counting final \000 */
int prefix; /* Number of characters in prefix */
int longestSuffix; /* Longest suffix that is a prefix on another word */
int iNext; /* Index in aKeywordTable[] of next with same hash */
................................................................................
# define WINDOWFUNC 0x00100000
#endif
/*
** These are the keywords
*/
static Keyword aKeywordTable[] = {
{ "ABORT", "TK_ABORT", CONFLICT|TRIGGER, 0 },
{ "ACTION", "TK_ACTION", FKEY, 0 },
{ "ADD", "TK_ADD", ALTER, 1 },
{ "AFTER", "TK_AFTER", TRIGGER, 0 },
{ "ALL", "TK_ALL", ALWAYS, 0 },
{ "ALTER", "TK_ALTER", ALTER, 0 },
{ "ALWAYS", "TK_ALWAYS", ALWAYS, 0 },
{ "ANALYZE", "TK_ANALYZE", ANALYZE, 0 },
{ "AND", "TK_AND", ALWAYS, 10 },
{ "AS", "TK_AS", ALWAYS, 10 },
{ "ASC", "TK_ASC", ALWAYS, 0 },
{ "ATTACH", "TK_ATTACH", ATTACH, 1 },
{ "AUTOINCREMENT", "TK_AUTOINCR", AUTOINCR, 0 },
{ "BEFORE", "TK_BEFORE", TRIGGER, 0 },
{ "BEGIN", "TK_BEGIN", ALWAYS, 1 },
{ "BETWEEN", "TK_BETWEEN", ALWAYS, 5 },
{ "BY", "TK_BY", ALWAYS, 10 },
{ "CASCADE", "TK_CASCADE", FKEY, 1 },
{ "CASE", "TK_CASE", ALWAYS, 5 },
{ "CAST", "TK_CAST", CAST, 5 },
{ "CHECK", "TK_CHECK", ALWAYS, 1 },
{ "COLLATE", "TK_COLLATE", ALWAYS, 1 },
{ "COLUMN", "TK_COLUMNKW", ALTER, 1 },
{ "COMMIT", "TK_COMMIT", ALWAYS, 1 },
{ "CONFLICT", "TK_CONFLICT", CONFLICT, 0 },
{ "CONSTRAINT", "TK_CONSTRAINT", ALWAYS, 1 },
{ "CREATE", "TK_CREATE", ALWAYS, 2 },
{ "CROSS", "TK_JOIN_KW", ALWAYS, 3 },
{ "CURRENT", "TK_CURRENT", WINDOWFUNC, 1 },
{ "CURRENT_DATE", "TK_CTIME_KW", ALWAYS, 1 },
{ "CURRENT_TIME", "TK_CTIME_KW", ALWAYS, 1 },
{ "CURRENT_TIMESTAMP","TK_CTIME_KW", ALWAYS, 1 },
{ "DATABASE", "TK_DATABASE", ATTACH, 0 },
{ "DEFAULT", "TK_DEFAULT", ALWAYS, 1 },
{ "DEFERRED", "TK_DEFERRED", ALWAYS, 1 },
{ "DEFERRABLE", "TK_DEFERRABLE", FKEY, 1 },
{ "DELETE", "TK_DELETE", ALWAYS, 10 },
{ "DESC", "TK_DESC", ALWAYS, 3 },
{ "DETACH", "TK_DETACH", ATTACH, 0 },
{ "DISTINCT", "TK_DISTINCT", ALWAYS, 5 },
{ "DO", "TK_DO", UPSERT, 2 },
{ "DROP", "TK_DROP", ALWAYS, 1 },
{ "END", "TK_END", ALWAYS, 1 },
{ "EACH", "TK_EACH", TRIGGER, 1 },
{ "ELSE", "TK_ELSE", ALWAYS, 2 },
{ "ESCAPE", "TK_ESCAPE", ALWAYS, 4 },
{ "EXCEPT", "TK_EXCEPT", COMPOUND, 4 },
{ "EXCLUSIVE", "TK_EXCLUSIVE", ALWAYS, 1 },
{ "EXCLUDE", "TK_EXCLUDE", WINDOWFUNC, 1 },
{ "EXISTS", "TK_EXISTS", ALWAYS, 4 },
{ "EXPLAIN", "TK_EXPLAIN", EXPLAIN, 1 },
{ "FAIL", "TK_FAIL", CONFLICT|TRIGGER, 1 },
{ "FILTER", "TK_FILTER", WINDOWFUNC, 4 },
{ "FIRST", "TK_FIRST", ALWAYS, 4 },
{ "FOLLOWING", "TK_FOLLOWING", WINDOWFUNC, 4 },
{ "FOR", "TK_FOR", TRIGGER, 2 },
{ "FOREIGN", "TK_FOREIGN", FKEY, 1 },
{ "FROM", "TK_FROM", ALWAYS, 10 },
{ "FULL", "TK_JOIN_KW", ALWAYS, 3 },
{ "GENERATED", "TK_GENERATED", ALWAYS, 1 },
{ "GLOB", "TK_LIKE_KW", ALWAYS, 3 },
{ "GROUP", "TK_GROUP", ALWAYS, 5 },
{ "GROUPS", "TK_GROUPS", WINDOWFUNC, 2 },
{ "HAVING", "TK_HAVING", ALWAYS, 5 },
{ "IF", "TK_IF", ALWAYS, 2 },
{ "IGNORE", "TK_IGNORE", CONFLICT|TRIGGER, 1 },
{ "IMMEDIATE", "TK_IMMEDIATE", ALWAYS, 1 },
{ "IN", "TK_IN", ALWAYS, 10 },
{ "INDEX", "TK_INDEX", ALWAYS, 1 },
{ "INDEXED", "TK_INDEXED", ALWAYS, 0 },
{ "INITIALLY", "TK_INITIALLY", FKEY, 1 },
{ "INNER", "TK_JOIN_KW", ALWAYS, 1 },
{ "INSERT", "TK_INSERT", ALWAYS, 10 },
{ "INSTEAD", "TK_INSTEAD", TRIGGER, 1 },
{ "INTERSECT", "TK_INTERSECT", COMPOUND, 5 },
{ "INTO", "TK_INTO", ALWAYS, 10 },
{ "IS", "TK_IS", ALWAYS, 5 },
{ "ISNULL", "TK_ISNULL", ALWAYS, 5 },
{ "JOIN", "TK_JOIN", ALWAYS, 5 },
{ "KEY", "TK_KEY", ALWAYS, 1 },
{ "LAST", "TK_LAST", ALWAYS, 4 },
{ "LEFT", "TK_JOIN_KW", ALWAYS, 5 },
{ "LIKE", "TK_LIKE_KW", ALWAYS, 5 },
{ "LIMIT", "TK_LIMIT", ALWAYS, 3 },
{ "MATCH", "TK_MATCH", ALWAYS, 2 },
{ "NATURAL", "TK_JOIN_KW", ALWAYS, 3 },
{ "NO", "TK_NO", FKEY|WINDOWFUNC, 2 },
{ "NOT", "TK_NOT", ALWAYS, 10 },
{ "NOTHING", "TK_NOTHING", UPSERT, 1 },
{ "NOTNULL", "TK_NOTNULL", ALWAYS, 3 },
{ "NULL", "TK_NULL", ALWAYS, 10 },
{ "NULLS", "TK_NULLS", ALWAYS, 3 },
{ "OF", "TK_OF", ALWAYS, 3 },
{ "OFFSET", "TK_OFFSET", ALWAYS, 1 },
{ "ON", "TK_ON", ALWAYS, 1 },
{ "OR", "TK_OR", ALWAYS, 9 },
{ "ORDER", "TK_ORDER", ALWAYS, 10 },
{ "OTHERS", "TK_OTHERS", WINDOWFUNC, 3 },
{ "OUTER", "TK_JOIN_KW", ALWAYS, 5 },
{ "OVER", "TK_OVER", WINDOWFUNC, 3 },
{ "PARTITION", "TK_PARTITION", WINDOWFUNC, 3 },
{ "PLAN", "TK_PLAN", EXPLAIN, 0 },
{ "PRAGMA", "TK_PRAGMA", PRAGMA, 0 },
{ "PRECEDING", "TK_PRECEDING", WINDOWFUNC, 3 },
{ "PRIMARY", "TK_PRIMARY", ALWAYS, 1 },
{ "QUERY", "TK_QUERY", EXPLAIN, 0 },
{ "RAISE", "TK_RAISE", TRIGGER, 1 },
{ "RANGE", "TK_RANGE", WINDOWFUNC, 3 },
{ "RECURSIVE", "TK_RECURSIVE", CTE, 3 },
{ "REFERENCES", "TK_REFERENCES", FKEY, 1 },
{ "REGEXP", "TK_LIKE_KW", ALWAYS, 3 },
{ "REINDEX", "TK_REINDEX", REINDEX, 1 },
{ "RELEASE", "TK_RELEASE", ALWAYS, 1 },
{ "RENAME", "TK_RENAME", ALTER, 1 },
{ "REPLACE", "TK_REPLACE", CONFLICT, 10 },
{ "RESTRICT", "TK_RESTRICT", FKEY, 1 },
{ "RIGHT", "TK_JOIN_KW", ALWAYS, 0 },
{ "ROLLBACK", "TK_ROLLBACK", ALWAYS, 1 },
{ "ROW", "TK_ROW", TRIGGER, 1 },
{ "ROWS", "TK_ROWS", ALWAYS, 1 },
{ "SAVEPOINT", "TK_SAVEPOINT", ALWAYS, 1 },
{ "SELECT", "TK_SELECT", ALWAYS, 10 },
{ "SET", "TK_SET", ALWAYS, 10 },
{ "TABLE", "TK_TABLE", ALWAYS, 1 },
{ "TEMP", "TK_TEMP", ALWAYS, 1 },
{ "TEMPORARY", "TK_TEMP", ALWAYS, 1 },
{ "THEN", "TK_THEN", ALWAYS, 3 },
{ "TIES", "TK_TIES", WINDOWFUNC, 3 },
{ "TO", "TK_TO", ALWAYS, 3 },
{ "TRANSACTION", "TK_TRANSACTION", ALWAYS, 1 },
{ "TRIGGER", "TK_TRIGGER", TRIGGER, 1 },
{ "UNBOUNDED", "TK_UNBOUNDED", WINDOWFUNC, 3 },
{ "UNION", "TK_UNION", COMPOUND, 3 },
{ "UNIQUE", "TK_UNIQUE", ALWAYS, 1 },
{ "UPDATE", "TK_UPDATE", ALWAYS, 10 },
{ "USING", "TK_USING", ALWAYS, 8 },
{ "VACUUM", "TK_VACUUM", VACUUM, 1 },
{ "VALUES", "TK_VALUES", ALWAYS, 10 },
{ "VIEW", "TK_VIEW", VIEW, 1 },
{ "VIRTUAL", "TK_VIRTUAL", VTAB, 1 },
{ "WHEN", "TK_WHEN", ALWAYS, 1 },
{ "WHERE", "TK_WHERE", ALWAYS, 10 },
{ "WINDOW", "TK_WINDOW", WINDOWFUNC, 3 },
{ "WITH", "TK_WITH", CTE, 4 },
{ "WITHOUT", "TK_WITHOUT", ALWAYS, 1 },
};
/* Number of keywords */
static int nKeyword = (sizeof(aKeywordTable)/sizeof(aKeywordTable[0]));
/* Map all alphabetic characters into lower-case for hashing. This is
** only valid for alphabetics. In particular it does not work for '_'
................................................................................
static Keyword *findById(int id){
int i;
for(i=0; i<nKeyword; i++){
if( aKeywordTable[i].id==id ) break;
}
return &aKeywordTable[i];
}
/*
** If aKeyword[*pFrom-1].iNext has a higher priority that aKeyword[*pFrom-1]
** itself, then swap them.
*/
static void reorder(int *pFrom){
int i = *pFrom - 1;
int j = aKeywordTable[i].iNext;
if( j==0 ) return;
j--;
if( aKeywordTable[i].priority >= aKeywordTable[j].priority ) return;
aKeywordTable[i].iNext = aKeywordTable[j].iNext;
aKeywordTable[j].iNext = i+1;
*pFrom = j+1;
reorder(&aKeywordTable[i].iNext);
}
/*
** This routine does the work. The generated code is printed on standard
** output.
*/
int main(int argc, char **argv){
int i, j, k, h;
................................................................................
/* Compute the hash */
for(i=0; i<bestSize; i++) aKWHash[i] = 0;
for(i=0; i<nKeyword; i++){
h = aKeywordTable[i].hash % bestSize;
aKeywordTable[i].iNext = aKWHash[h];
aKWHash[h] = i+1;
reorder(&aKWHash[h]);
}
/* Begin generating code */
printf("%s", zHdr);
printf("/* Hash score: %d */\n", bestCount);
printf("/* zKWText[] encodes %d bytes of keyword text in %d bytes */\n",
totalLen + nKeyword, nChar+1 );
................................................................................
j++;
if( j>=5 ){
printf("\n");
j = 0;
}
}
printf("%s};\n", j==0 ? "" : "\n");
printf("/* Hash table decoded:\n");
for(i=0; i<bestSize; i++){
j = aKWHash[i];
printf("** %3d:", i);
while( j ){
printf(" %s", aKeywordTable[j-1].zOrigName);
j = aKeywordTable[j-1].iNext;
}
printf("\n");
}
printf("*/\n");
printf("/* Check to see if z[0..n-1] is a keyword. If it is, write the\n");
printf("** parser symbol code for that keyword into *pType. Always\n");
printf("** return the integer n (the length of the token). */\n");
printf("static int keywordCode(const char *z, int n, int *pType){\n");
printf(" int i, j;\n");
printf(" const char *zKW;\n");
printf(" if( n>=2 ){\n");
|