The changes to fix [f7b4edece25c9948] mean that the schema is always loaded

whenever a prepared statement is running.  This means that a couple of
branches can be eliminated and one operand of OP_ParseSchema can be removed.

FossilOrigin-Name: b6e268fce12829f058f1dfa223731ec8479493f8

manifest

@@ -1,8 +1,8 @@
 -----BEGIN PGP SIGNED MESSAGE-----
 Hash: SHA1
 
-C Fix\sa\ssigned/unsigned\scomparison\scompiler\swarning.
-D 2011-03-23T22:54:59.680
+C The\schanges\sto\sfix\s[f7b4edece25c9948]\smean\sthat\sthe\sschema\sis\salways\sloaded\nwhenever\sa\sprepared\sstatement\sis\srunning.\s\sThis\smeans\sthat\sa\scouple\sof\nbranches\scan\sbe\seliminated\sand\sone\soperand\sof\sOP_ParseSchema\scan\sbe\sremoved.
+D 2011-03-24T01:34:03.589
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 27701a1653595a1f2187dc61c8117e00a6c1d50f
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -127,7 +127,7 @@ F src/btmutex.c 96a12f50f7a17475155971a241d85ec5171573ff
 F src/btree.c 43302cc4f3de6479b90fa6bb271b65d86333d00e
 F src/btree.h e2f2cd9933bf30724f53ffa12c4c5a3a864bbd6e
 F src/btreeInt.h 20f73dc93b1eeb83afd7259fbc6bd7dcf2df7fe4
-F src/build.c 821d4b3c6b1da068a4eb1e9c8c414b75612d34c2
+F src/build.c 6c490fe14dedb094a202f559e3b29a276abffcf8
 F src/callback.c 5069f224882cbdccd559f591271d28d7f37745bc
 F src/complete.c dc1d136c0feee03c2f7550bafc0d29075e36deac
 F src/ctime.c 52ff72f966cee3087e0138a3ec69371c22be3c01
@@ -234,7 +234,7 @@ F src/update.c 81911be16ece3c3e7716aa18565b4814ec41f8b9
 F src/utf.c 1baeeac91707a4df97ccc6141ec0f808278af685
 F src/util.c cd997077bad039efc0597eb027c929658f93c018
 F src/vacuum.c 924bd1bcee2dfb05376f79845bd3b4cec7b54b2f
-F src/vdbe.c 8430780c643bf67d4b5da27f24d6ad39804fdaf4
+F src/vdbe.c e3f37ca0afdd72e883475e2a32a06167df2810d0
 F src/vdbe.h 4de0efb4b0fdaaa900cf419b35c458933ef1c6d2
 F src/vdbeInt.h e1c6254641168507d25b46affb6dfb53c782f553
 F src/vdbeapi.c a09ad9164cafc505250d5dd6b69660c960f1308c
@@ -242,7 +242,7 @@ F src/vdbeaux.c cfd3f3ac674691ba1166ceb9a2698b0d00b2ef91
 F src/vdbeblob.c c3ccb7c8732858c680f442932e66ad06bb036562
 F src/vdbemem.c 0498796b6ffbe45e32960d6a1f5adfb6e419883b
 F src/vdbetrace.c 3ba13bc32bdf16d2bdea523245fd16736bed67b5
-F src/vtab.c b297e8fa656ab5e66244ab15680d68db0adbec30
+F src/vtab.c e1edca38c4c4310710635bb91bb3c87fdf60f21d
 F src/wal.c 7334009b396285b658a95a3b6bc6d2b016a1f794
 F src/wal.h 7a5fbb00114b7f2cd40c7e1003d4c41ce9d26840
 F src/walker.c 3112bb3afe1d85dc52317cb1d752055e9a781f8f
@@ -918,14 +918,14 @@ F tool/speedtest2.tcl ee2149167303ba8e95af97873c575c3e0fab58ff
 F tool/speedtest8.c 2902c46588c40b55661e471d7a86e4dd71a18224
 F tool/speedtest8inst1.c 293327bc76823f473684d589a8160bde1f52c14e
 F tool/vdbe-compress.tcl d70ea6d8a19e3571d7ab8c9b75cba86d1173ff0f
-P ad4dc7b95f94fc9a5430c1305fb61d9de79b3365
-R 05f42cc00ab3cdb64365c2fe171fc56f
+P c81da6f98d89935442c447a51736e11baf5a7bc1
+R 1385a7d5de36b79443cb7c3a0640b642
 U drh
-Z 644dd0f67efa20295e11832c3a2205f7
+Z 543f2172a6c6f59b12f6f8179ba74ac8
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manifest.uuid

@@ -1 +1 @@
-c81da6f98d89935442c447a51736e11baf5a7bc1
+b6e268fce12829f058f1dfa223731ec8479493f8

src/build.c

@@ -368,7 +368,7 @@ void sqlite3UnlinkAndDeleteIndex(sqlite3 *db, int iDb, const char *zIdxName){
 
   len = sqlite3Strlen30(zIdxName);
   pIndex = sqlite3HashInsert(pHash, zIdxName, len, 0);
-  if( pIndex ){
+  if( ALWAYS(pIndex) ){
     if( pIndex->pTable->pIndex==pIndex ){
       pIndex->pTable->pIndex = pIndex->pNext;
     }else{

src/vdbe.c

@@ -4608,14 +4608,10 @@ case OP_CreateTable: {          /* out2-prerelease */
   break;
 }
 
-/* Opcode: ParseSchema P1 P2 * P4 *
+/* Opcode: ParseSchema P1 * * P4 *
 **
 ** Read and parse all entries from the SQLITE_MASTER table of database P1
-** that match the WHERE clause P4.  P2 is the "force" flag.   Always do
-** the parsing if P2 is true.  If P2 is false, then this routine is a
-** no-op if the schema is not currently loaded.  In other words, if P2
-** is false, the SQLITE_MASTER table is only parsed if the rest of the
-** schema is already loaded into the symbol table.
+** that match the WHERE clause P4. 
 **
 ** This opcode invokes the parser to create a new virtual machine,
 ** then runs the new virtual machine.  It is thus a re-entrant opcode.
@@ -4629,14 +4625,7 @@ case OP_ParseSchema: {
   iDb = pOp->p1;
   assert( iDb>=0 && iDb<db->nDb );
 
-  /* If pOp->p2 is 0, then this opcode is being executed to read a
-  ** single row, for example the row corresponding to a new index
-  ** created by this VDBE, from the sqlite_master table. It only
-  ** does this if the corresponding in-memory schema is currently
-  ** loaded. Otherwise, the new index definition can be loaded along
-  ** with the rest of the schema when it is required.
-  **
-  ** Although the mutex on the BtShared object that corresponds to
+  /* Although the mutex on the BtShared object that corresponds to
   ** database iDb (the database containing the sqlite_master table
   ** read by this instruction) is currently held, it is necessary to
   ** obtain the mutexes on all attached databases before checking if
@@ -4652,7 +4641,7 @@ case OP_ParseSchema: {
   */
   assert( sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );
   sqlite3BtreeEnterAll(db);
-  if( pOp->p2 || DbHasProperty(db, iDb, DB_SchemaLoaded) ){
+  if( ALWAYS(DbHasProperty(db, iDb, DB_SchemaLoaded)) ){
     zMaster = SCHEMA_TABLE(iDb);
     initData.db = db;
     initData.iDb = pOp->p1;

src/vtab.c

@@ -372,7 +372,7 @@ void sqlite3VtabFinishParse(Parse *pParse, Token *pEnd){
 
     sqlite3VdbeAddOp2(v, OP_Expire, 0, 0);
     zWhere = sqlite3MPrintf(db, "name='%q' AND type='table'", pTab->zName);
-    sqlite3VdbeAddOp4(v, OP_ParseSchema, iDb, 1, 0, zWhere, P4_DYNAMIC);
+    sqlite3VdbeAddOp4(v, OP_ParseSchema, iDb, 0, 0, zWhere, P4_DYNAMIC);
     sqlite3VdbeAddOp4(v, OP_VCreate, iDb, 0, 0, 
                          pTab->zName, sqlite3Strlen30(pTab->zName) + 1);
   }