Slightly smaller and faster by allocating Parser objects on the stack.

FossilOrigin-Name: 436a89b91901851ce21bf0cb997291b48888c52788b904822083d8dfac32b84b

manifest

@@ -1,5 +1,5 @@
-C Split\sthe\sOP_Last\sopcode\sinto\sOP_Last\sand\sOP_SeekEnd.\s\sUse\sOP_SeekEnd\sto\nposition\sa\scursor\sprior\sto\sappending.\s\sTicket\s[cb91bf4290c211d].
+C Slightly\ssmaller\sand\sfaster\sby\sallocating\sParser\sobjects\son\sthe\sstack.
-D 2017-08-01T19:53:43.985
+D 2017-08-01T20:59:41.114
 F Makefile.in d9873c9925917cca9990ee24be17eb9613a668012c85a343aef7e5536ae266e8
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 02b469e9dcd5b7ee63fc1fb05babc174260ee4cfa4e0ef2e48c3c6801567a016
@@ -447,7 +447,7 @@ F src/pcache.h 521bb9610d38ef17a3cc9b5ddafd4546c2ea67fa3d0e464823d73c2a28d50e11
 F src/pcache1.c 1195a21fe28e223e024f900b2011e80df53793f0356a24caace4188b098540dc
 F src/pragma.c cd6aeda3587be6c5c08f9b2d45eae6068666a03c9d077c8c43cdb85fb0aa70f2
 F src/pragma.h bb83728944b42f6d409c77f5838a8edbdb0fe83046c5496ffc9602b40340a324
-F src/prepare.c 1eaeccc1f9dd5b2806408e530c0f05a1972272b66d827d0a7fdc2b192b357ead
+F src/prepare.c 3cbb99757d7295997674972f9dd2331c5c544368854ca08954c9beb1e9b6145a
 F src/printf.c 8757834f1b54dae512fb25eb1acc8e94a0d15dd2290b58f2563f65973265adb2
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c 4324a94573b1e29286f8121e4881db59eaedc014afeb274c8d3e07ed282e0e20
@@ -525,11 +525,11 @@ F src/vdbe.h d50cadf12bcf9fb99117ef392ce1ea283aa429270481426b6e8b0280c101fd97
 F src/vdbeInt.h ff2b7db0968d20e6184aee256d2e535d565f5a172e3588a78adb166a41fc4911
 F src/vdbeapi.c 0823531191f9d5588a245ed5b39306798681814e9e8099d54a3213a13a28fbe7
 F src/vdbeaux.c 3fe68bad02b33b09e08bdc0ad90d6b92b3d571f7864c3d047abca1bde050751c
-F src/vdbeblob.c 359891617358deefc85bef7bcf787fa6b77facb9
+F src/vdbeblob.c db3cf91060f6f4b2f1358a4200e844697990752177784c7c95da00b7ac9f1c7b
 F src/vdbemem.c 9ca2854976f35db40341977e688a08204c96427505f5b90215dc7970f6ea42c4
 F src/vdbesort.c f512c68d0bf7e0105316a5594c4329358c8ee9cae3b25138df041d97516c0372
 F src/vdbetrace.c 41963d5376f0349842b5fc4aaaaacd7d9cdc0834
-F src/vtab.c 35b9bdc2b41de32a417141d12097bcc4e29a77ed7cdb8f836d1d2305d946b61b
+F src/vtab.c a305582d3a6c7090982ac1610b8e5724fa954d8b28899fa6c633cb4de9c2f8ee
 F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
 F src/wal.c 40c543f0a2195d1b0dc88ef12142bea690009344
 F src/wal.h 06b2a0b599cc0f53ea97f497cf8c6b758c999f71
@@ -1640,7 +1640,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 24190b221f73472dafaead6de101b4debc2c91c1ca28d70b45a38df5bb61fb39
+P 3e02474c7bbe16891a7cfc8771cf72f64cd2c0692779037982d7d307512a4f23
-R e20c96636649f5a0133f10107f6b5f8c
+R 35dd6f122e0eccef84c52104465fc373
 U drh
-Z 860ec7307cf1110562833040172ad143
+Z f4141e1f5aaa0f85940bd20cb4d51443

manifest.uuid

@@ -1 +1 @@
-3e02474c7bbe16891a7cfc8771cf72f64cd2c0692779037982d7d307512a4f23
+436a89b91901851ce21bf0cb997291b48888c52788b904822083d8dfac32b84b

src/prepare.c

@@ -494,16 +494,14 @@ int sqlite3SchemaToIndex(sqlite3 *db, Schema *pSchema){
 ** Free all memory allocations in the pParse object
 */
 void sqlite3ParserReset(Parse *pParse){
-  if( pParse ){
+  sqlite3 *db = pParse->db;
-    sqlite3 *db = pParse->db;
+  sqlite3DbFree(db, pParse->aLabel);
-    sqlite3DbFree(db, pParse->aLabel);
+  sqlite3ExprListDelete(db, pParse->pConstExpr);
-    sqlite3ExprListDelete(db, pParse->pConstExpr);
+  if( db ){
-    if( db ){
+    assert( db->lookaside.bDisable >= pParse->disableLookaside );
-      assert( db->lookaside.bDisable >= pParse->disableLookaside );
+    db->lookaside.bDisable -= pParse->disableLookaside;
-      db->lookaside.bDisable -= pParse->disableLookaside;
-    }
-    pParse->disableLookaside = 0;
   }
+  pParse->disableLookaside = 0;
 }
 
 /*

src/vdbeblob.c

@@ -129,8 +129,8 @@ int sqlite3_blob_open(
   int rc = SQLITE_OK;
   char *zErr = 0;
   Table *pTab;
-  Parse *pParse = 0;
   Incrblob *pBlob = 0;
+  Parse sParse;
 
 #ifdef SQLITE_ENABLE_API_ARMOR
   if( ppBlob==0 ){
@@ -148,37 +148,34 @@ int sqlite3_blob_open(
   sqlite3_mutex_enter(db->mutex);
 
   pBlob = (Incrblob *)sqlite3DbMallocZero(db, sizeof(Incrblob));
-  if( !pBlob ) goto blob_open_out;
-  pParse = sqlite3StackAllocRaw(db, sizeof(*pParse));
-  if( !pParse ) goto blob_open_out;
-
   do {
-    memset(pParse, 0, sizeof(Parse));
+    memset(&sParse, 0, sizeof(Parse));
-    pParse->db = db;
+    if( !pBlob ) goto blob_open_out;
+    sParse.db = db;
     sqlite3DbFree(db, zErr);
     zErr = 0;
 
     sqlite3BtreeEnterAll(db);
-    pTab = sqlite3LocateTable(pParse, 0, zTable, zDb);
+    pTab = sqlite3LocateTable(&sParse, 0, zTable, zDb);
     if( pTab && IsVirtual(pTab) ){
       pTab = 0;
-      sqlite3ErrorMsg(pParse, "cannot open virtual table: %s", zTable);
+      sqlite3ErrorMsg(&sParse, "cannot open virtual table: %s", zTable);
     }
     if( pTab && !HasRowid(pTab) ){
       pTab = 0;
-      sqlite3ErrorMsg(pParse, "cannot open table without rowid: %s", zTable);
+      sqlite3ErrorMsg(&sParse, "cannot open table without rowid: %s", zTable);
     }
 #ifndef SQLITE_OMIT_VIEW
     if( pTab && pTab->pSelect ){
       pTab = 0;
-      sqlite3ErrorMsg(pParse, "cannot open view: %s", zTable);
+      sqlite3ErrorMsg(&sParse, "cannot open view: %s", zTable);
     }
 #endif
     if( !pTab ){
-      if( pParse->zErrMsg ){
+      if( sParse.zErrMsg ){
         sqlite3DbFree(db, zErr);
-        zErr = pParse->zErrMsg;
+        zErr = sParse.zErrMsg;
-        pParse->zErrMsg = 0;
+        sParse.zErrMsg = 0;
       }
       rc = SQLITE_ERROR;
       sqlite3BtreeLeaveAll(db);
@@ -242,7 +239,7 @@ int sqlite3_blob_open(
       }
     }
 
-    pBlob->pStmt = (sqlite3_stmt *)sqlite3VdbeCreate(pParse);
+    pBlob->pStmt = (sqlite3_stmt *)sqlite3VdbeCreate(&sParse);
     assert( pBlob->pStmt || db->mallocFailed );
     if( pBlob->pStmt ){
       
@@ -315,10 +312,10 @@ int sqlite3_blob_open(
         aOp[1].p4.i = pTab->nCol+1;
         aOp[3].p2 = pTab->nCol;
 
-        pParse->nVar = 0;
+        sParse.nVar = 0;
-        pParse->nMem = 1;
+        sParse.nMem = 1;
-        pParse->nTab = 1;
+        sParse.nTab = 1;
-        sqlite3VdbeMakeReady(v, pParse);
+        sqlite3VdbeMakeReady(v, &sParse);
       }
     }
    
@@ -340,8 +337,7 @@ blob_open_out:
   }
   sqlite3ErrorWithMsg(db, rc, (zErr ? "%s" : 0), zErr);
   sqlite3DbFree(db, zErr);
-  sqlite3ParserReset(pParse);
+  sqlite3ParserReset(&sParse);
-  sqlite3StackFree(db, pParse);
   rc = sqlite3ApiExit(db, rc);
   sqlite3_mutex_leave(db->mutex);
   return rc;

src/vtab.c

@@ -733,10 +733,10 @@ int sqlite3VtabCallCreate(sqlite3 *db, int iDb, const char *zTab, char **pzErr){
 */
 int sqlite3_declare_vtab(sqlite3 *db, const char *zCreateTable){
   VtabCtx *pCtx;
-  Parse *pParse;
   int rc = SQLITE_OK;
   Table *pTab;
   char *zErr = 0;
+  Parse sParse;
 
 #ifdef SQLITE_ENABLE_API_ARMOR
   if( !sqlite3SafetyCheckOk(db) || zCreateTable==0 ){
@@ -753,55 +753,49 @@ int sqlite3_declare_vtab(sqlite3 *db, const char *zCreateTable){
   pTab = pCtx->pTab;
   assert( IsVirtual(pTab) );
 
-  pParse = sqlite3StackAllocZero(db, sizeof(*pParse));
+  memset(&sParse, 0, sizeof(sParse));
-  if( pParse==0 ){
+  sParse.declareVtab = 1;
-    rc = SQLITE_NOMEM_BKPT;
+  sParse.db = db;
-  }else{
+  sParse.nQueryLoop = 1;
-    pParse->declareVtab = 1;
+  if( SQLITE_OK==sqlite3RunParser(&sParse, zCreateTable, &zErr) 
-    pParse->db = db;
+   && sParse.pNewTable
-    pParse->nQueryLoop = 1;
+   && !db->mallocFailed
-  
+   && !sParse.pNewTable->pSelect
-    if( SQLITE_OK==sqlite3RunParser(pParse, zCreateTable, &zErr) 
+   && !IsVirtual(sParse.pNewTable)
-     && pParse->pNewTable
+  ){
-     && !db->mallocFailed
+    if( !pTab->aCol ){
-     && !pParse->pNewTable->pSelect
+      Table *pNew = sParse.pNewTable;
-     && !IsVirtual(pParse->pNewTable)
+      Index *pIdx;
-    ){
+      pTab->aCol = pNew->aCol;
-      if( !pTab->aCol ){
+      pTab->nCol = pNew->nCol;
-        Table *pNew = pParse->pNewTable;
+      pTab->tabFlags |= pNew->tabFlags & (TF_WithoutRowid|TF_NoVisibleRowid);
-        Index *pIdx;
+      pNew->nCol = 0;
-        pTab->aCol = pNew->aCol;
+      pNew->aCol = 0;
-        pTab->nCol = pNew->nCol;
+      assert( pTab->pIndex==0 );
-        pTab->tabFlags |= pNew->tabFlags & (TF_WithoutRowid|TF_NoVisibleRowid);
+      if( !HasRowid(pNew) && pCtx->pVTable->pMod->pModule->xUpdate!=0 ){
-        pNew->nCol = 0;
+        rc = SQLITE_ERROR;
-        pNew->aCol = 0;
+      }
-        assert( pTab->pIndex==0 );
+      pIdx = pNew->pIndex;
-        if( !HasRowid(pNew) && pCtx->pVTable->pMod->pModule->xUpdate!=0 ){
+      if( pIdx ){
-          rc = SQLITE_ERROR;
+        assert( pIdx->pNext==0 );
-        }
+        pTab->pIndex = pIdx;
-        pIdx = pNew->pIndex;
+        pNew->pIndex = 0;
-        if( pIdx ){
+        pIdx->pTable = pTab;
-          assert( pIdx->pNext==0 );
-          pTab->pIndex = pIdx;
-          pNew->pIndex = 0;
-          pIdx->pTable = pTab;
-        }
       }
-      pCtx->bDeclared = 1;
-    }else{
-      sqlite3ErrorWithMsg(db, SQLITE_ERROR, (zErr ? "%s" : 0), zErr);
-      sqlite3DbFree(db, zErr);
-      rc = SQLITE_ERROR;
     }
-    pParse->declareVtab = 0;
+    pCtx->bDeclared = 1;
-  
+  }else{
-    if( pParse->pVdbe ){
+    sqlite3ErrorWithMsg(db, SQLITE_ERROR, (zErr ? "%s" : 0), zErr);
-      sqlite3VdbeFinalize(pParse->pVdbe);
+    sqlite3DbFree(db, zErr);
-    }
+    rc = SQLITE_ERROR;
-    sqlite3DeleteTable(db, pParse->pNewTable);
-    sqlite3ParserReset(pParse);
-    sqlite3StackFree(db, pParse);
   }
+  sParse.declareVtab = 0;
+
+  if( sParse.pVdbe ){
+    sqlite3VdbeFinalize(sParse.pVdbe);
+  }
+  sqlite3DeleteTable(db, sParse.pNewTable);
+  sqlite3ParserReset(&sParse);
 
   assert( (rc&0xff)==rc );
   rc = sqlite3ApiExit(db, rc);