Size and performance optimization for sqlite3Init().

FossilOrigin-Name: 776d91284a891bec64d6f649ff17de898b6ac6f66dd3d2afccc394a012a40c7d

manifest

@@ -1,5 +1,5 @@
-C Small\sperformance\soptimization\sin\ssqlite3WhereBegin().
-D 2017-08-25T13:34:18.937
+C Size\sand\sperformance\soptimization\sfor\ssqlite3Init().
+D 2017-08-25T15:43:34.075
 F Makefile.in c644bbe8ebe4aae82ad6783eae6b6beea4c727b99ff97568b847ced5e2ac7afb
 F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
 F Makefile.msc 25b154da7f0b3d4924f27378c1f8d006285b80811f1ccf3ed953dbebf6282136
@@ -451,7 +451,7 @@ F src/pcache.h 521bb9610d38ef17a3cc9b5ddafd4546c2ea67fa3d0e464823d73c2a28d50e11
 F src/pcache1.c 0b793738b5dddaf0a645784835c6b5557b1ecfaee339af9c26810c6ecdb273aa
 F src/pragma.c a4e5028dfc8af4c5c347cd0e91bd2f0c0f81fcd9b2c6e0acf8da7da51df7f1fe
 F src/pragma.h bb83728944b42f6d409c77f5838a8edbdb0fe83046c5496ffc9602b40340a324
-F src/prepare.c 9e880c0efb5d7f9101bb34c0a87daf6e1e5284c34024fdb811e67bb02fdd299b
+F src/prepare.c 9a141a1b02dca53beaa9771699d390aafcac01f5d1f1c0ae6e23ded8dcdb709a
 F src/printf.c 40aee47ae9be4bd3dbdc8968bd07fddc027be8edec8daddf24d3391d36698a1c
 F src/random.c 80f5d666f23feb3e6665a6ce04c7197212a88384
 F src/resolve.c 4324a94573b1e29286f8121e4881db59eaedc014afeb274c8d3e07ed282e0e20
@@ -1651,7 +1651,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 2738b8db3caa6ce48d27cb5749d27b79241e6f6682b694886f6ef663e5443583
-R be107142fb32b5eeca2b38bf38398332
+P 39f708d1e286931365a8992dbe7f900108ff1dad146032a284ad1dec09b11e06
+R fe3e8a19bfb43e621f9a86b9a7564beb
 U drh
-Z ca59cf9901a72073d38774a5b3f91248
+Z 5ffd42d30ddfce1213880dd5c5ac3e27

manifest.uuid

@@ -1 +1 @@
-39f708d1e286931365a8992dbe7f900108ff1dad146032a284ad1dec09b11e06
+776d91284a891bec64d6f649ff17de898b6ac6f66dd3d2afccc394a012a40c7d

src/prepare.c

@@ -150,6 +150,8 @@ static int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg){
   assert( sqlite3_mutex_held(db->mutex) );
   assert( iDb==1 || sqlite3BtreeHoldsMutex(db->aDb[iDb].pBt) );
 
+  db->init.busy = 1;
+
   /* Construct the in-memory representation schema tables (sqlite_master or
   ** sqlite_temp_master) by invoking the parser directly.  The appropriate
   ** table name will be inserted automatically by the parser so we can just
@@ -158,7 +160,7 @@ static int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg){
   azArg[0] = zMasterName = SCHEMA_TABLE(iDb);
   azArg[1] = "1";
   azArg[2] = "CREATE TABLE x(type text,name text,tbl_name text,"
-                            "rootpage integer,sql text)";
+                            "rootpage int,sql text)";
   azArg[3] = 0;
   initData.db = db;
   initData.iDb = iDb;
@@ -174,10 +176,10 @@ static int sqlite3InitOne(sqlite3 *db, int iDb, char **pzErrMsg){
   */
   pDb = &db->aDb[iDb];
   if( pDb->pBt==0 ){
-    if( !OMIT_TEMPDB && ALWAYS(iDb==1) ){
-      DbSetProperty(db, 1, DB_SchemaLoaded);
-    }
-    return SQLITE_OK;
+    assert( iDb==1 );
+    DbSetProperty(db, 1, DB_SchemaLoaded);
+    rc = SQLITE_OK;
+    goto error_out;
   }
 
   /* If there is not already a read-only (or read-write) transaction opened
@@ -336,9 +338,13 @@ initone_error_out:
   sqlite3BtreeLeave(pDb->pBt);
 
 error_out:
-  if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
-    sqlite3OomFault(db);
+  if( rc ){
+    if( rc==SQLITE_NOMEM || rc==SQLITE_IOERR_NOMEM ){
+      sqlite3OomFault(db);
+    }
+    sqlite3ResetOneSchema(db, iDb);
   }
+  db->init.busy = 0;
   return rc;
 }
 
@@ -359,37 +365,24 @@ int sqlite3Init(sqlite3 *db, char **pzErrMsg){
   assert( sqlite3_mutex_held(db->mutex) );
   assert( sqlite3BtreeHoldsMutex(db->aDb[0].pBt) );
   assert( db->init.busy==0 );
-  rc = SQLITE_OK;
-  db->init.busy = 1;
   ENC(db) = SCHEMA_ENC(db);
-  for(i=0; rc==SQLITE_OK && i<db->nDb; i++){
-    if( DbHasProperty(db, i, DB_SchemaLoaded) || i==1 ) continue;
-    rc = sqlite3InitOne(db, i, pzErrMsg);
-    if( rc ){
-      sqlite3ResetOneSchema(db, i);
+  assert( db->nDb>0 );
+  /* Do the main schema first */
+  if( !DbHasProperty(db, 0, DB_SchemaLoaded) ){
+    rc = sqlite3InitOne(db, 0, pzErrMsg);
+    if( rc ) return rc;
+  }
+  /* All other schemas after the main schema. The "temp" schema must be last */
+  for(i=db->nDb-1; i>0; i--){
+    if( !DbHasProperty(db, i, DB_SchemaLoaded) ){
+      rc = sqlite3InitOne(db, i, pzErrMsg);
+      if( rc ) return rc;
     }
   }
-
-  /* Once all the other databases have been initialized, load the schema
-  ** for the TEMP database. This is loaded last, as the TEMP database
-  ** schema may contain references to objects in other databases.
-  */
-#ifndef SQLITE_OMIT_TEMPDB
-  assert( db->nDb>1 );
-  if( rc==SQLITE_OK && !DbHasProperty(db, 1, DB_SchemaLoaded) ){
-    rc = sqlite3InitOne(db, 1, pzErrMsg);
-    if( rc ){
-      sqlite3ResetOneSchema(db, 1);
-    }
-  }
-#endif
-
-  db->init.busy = 0;
-  if( rc==SQLITE_OK && commit_internal ){
+  if( commit_internal ){
     sqlite3CommitInternalChanges(db);
   }
-
-  return rc; 
+  return SQLITE_OK;
 }
 
 /*