Changes to spellfix to try to get it to use stack space instead of heap space

in cases where that makes sense.

FossilOrigin-Name: dfcebc7393a3a780ee9c4f257723c303bb633064

ext/misc/spellfix.c

@@ -365,8 +365,8 @@ static int editdist1(const char *zA, const char *zB, int *pnMatch){
   int *m;                /* The cost matrix */
   char *cx;              /* Corresponding character values */
   int *toFree = 0;       /* Malloced space */
-  int mStack[60+15];     /* Stack space to use if not too much is needed */
   int nMatch = 0;
+  int mStack[60+15];     /* Stack space to use if not too much is needed */
 
   /* Early out if either input is NULL */
   if( zA==0 || zB==0 ) return -1;
@@ -899,15 +899,24 @@ static int editDist3Core(
   EditDist3FromString f = *pFrom;
   EditDist3To *a2;
   unsigned int *m;
+  unsigned int *pToFree;
   int szRow;
   EditDist3Cost *p;
   int res;
+  sqlite3_uint64 nByte;
+  unsigned int stackSpace[16*1024];
 
   /* allocate the Wagner matrix and the aTo[] array for the TO string */
   n = (f.n+1)*(n2+1);
   n = (n+1)&~1;
-  m = sqlite3_malloc( n*sizeof(m[0]) + sizeof(a2[0])*n2 );
-  if( m==0 ) return -1;            /* Out of memory */
+  nByte = n*sizeof(m[0]) + sizeof(a2[0])*n2;
+  if( nByte<=sizeof(stackSpace) ){
+    m = stackSpace;
+    pToFree = 0;
+  }else{
+    m = pToFree = sqlite3_malloc( nByte );
+    if( m==0 ) return -1;            /* Out of memory */
+  }
   a2 = (EditDist3To*)&m[n];
   memset(a2, 0, sizeof(a2[0])*n2);
 
@@ -1029,7 +1038,7 @@ static int editDist3Core(
 
 editDist3Abort:
   for(i2=0; i2<n2; i2++) sqlite3_free(a2[i2].apIns);
-  sqlite3_free(m);
+  sqlite3_free(pToFree);
   return res;
 }
 

manifest

@@ -1,5 +1,5 @@
-C Fix\ssome\ssigned/unsigned\scomparison\scompiler\swarnings\sin\sfts5.
-D 2016-01-23T15:57:06.186
+C Changes\sto\sspellfix\sto\stry\sto\sget\sit\sto\suse\sstack\sspace\sinstead\sof\sheap\sspace\nin\scases\swhere\sthat\smakes\ssense.
+D 2016-01-23T18:24:52.238
 F Makefile.in 027c1603f255390c43a426671055a31c0a65fdb4
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 1708a78eda223b6daa302b140037fcc214a779f9
@@ -210,7 +210,7 @@ F ext/misc/regexp.c af92cdaa5058fcec1451e49becc7ba44dba023dc
 F ext/misc/rot13.c 1ac6f95f99b575907b9b09c81a349114cf9be45a
 F ext/misc/series.c b8fb7befd85b3a9b4a10e701b30b2b79ca92b6d4
 F ext/misc/showauth.c 732578f0fe4ce42d577e1c86dc89dd14a006ab52
-F ext/misc/spellfix.c df6efb90eb668d1860c9b59e4320e985e46dffa7
+F ext/misc/spellfix.c 5850a0e05ae1eacd48a3d80991c63b58d41e2d27
 F ext/misc/totype.c 4a167594e791abeed95e0a8db028822b5e8fe512
 F ext/misc/vfslog.c fe40fab5c077a40477f7e5eba994309ecac6cc95
 F ext/misc/vtshim.c babb0dc2bf116029e3e7c9a618b8a1377045303e
@@ -1419,7 +1419,7 @@ F tool/vdbe_profile.tcl 246d0da094856d72d2c12efec03250d71639d19f
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P f0a551edf87ef061deae34d88b02c3b484ae9adc
-R 962289f1674397e1ac71fafb409f527f
-U dan
-Z 5f630552e065d9e5a5f7f6919a0222d3
+P 3be336aa893f9eb0837d7d66c83bab1489792b9a
+R e0cc5654cf9d372268674d3acd0d1178
+U drh
+Z 5f4045218ee81aac454594c9cbaf4e94

manifest.uuid

@@ -1 +1 @@
-3be336aa893f9eb0837d7d66c83bab1489792b9a
+dfcebc7393a3a780ee9c4f257723c303bb633064