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Add the SQLITE_SPELLFIX_STACKALLOC_SZ compile-time option to control how much

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stack space is available for use as the Wagner matrix in editDest3 of the
spellfix extension.

FossilOrigin-Name: dd0100dd87e2c7c70fabb2d3188f0906e605583d
This commit is contained in:
drh
2016-01-23 22:55:53 +00:00
parent c6aab32144
commit 9084ec1d96
3 changed files with 19 additions and 8 deletions
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13
ext/misc/spellfix.c
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@ -875,6 +875,17 @@ static void updateCost(
}
}
/*
** How much stack space (int bytes) to use for Wagner matrix in
** editDist3Core(). If more space than this is required, the entire
** matrix is taken from the heap. To reduce the load on the memory
** allocator, make this value as large as practical for the
** architecture in use.
*/
#ifndef SQLITE_SPELLFIX_STACKALLOC_SZ
# define SQLITE_SPELLFIX_STACKALLOC_SZ (1024)
#endif
/* Compute the edit distance between two strings.
**
** If an error occurs, return a negative number which is the error code.
@ -904,7 +915,7 @@ static int editDist3Core(
EditDist3Cost *p;
int res;
sqlite3_uint64 nByte;
unsigned int stackSpace[16*1024];
unsigned int stackSpace[SQLITE_SPELLFIX_STACKALLOC_SZ/sizeof(unsigned int)];
/* allocate the Wagner matrix and the aTo[] array for the TO string */
n = (f.n+1)*(n2+1);