Initial support for virtual tables implemented in JavaScript.

FossilOrigin-Name: a1454744c770a30a32a6d7b7fc59ef7be48cf67348b238540592850d7c2c7757

ext/wasm/GNUmakefile

@@ -289,7 +289,7 @@ sqlite3-api.jses += $(dir.api)/sqlite3-api-glue.js
 sqlite3-api.jses += $(sqlite3-api-build-version.js)
 sqlite3-api.jses += $(dir.api)/sqlite3-api-oo1.js
 sqlite3-api.jses += $(dir.api)/sqlite3-api-worker1.js
-sqlite3-api.jses += $(dir.api)/sqlite3-vfs-helper.js
+sqlite3-api.jses += $(dir.api)/sqlite3-v-helper.js
 sqlite3-api.jses += $(dir.api)/sqlite3-vfs-opfs.c-pp.js
 sqlite3-api.jses += $(dir.api)/sqlite3-api-cleanup.js
 

ext/wasm/api/EXPORTED_FUNCTIONS.sqlite3-api

@@ -6,12 +6,15 @@ _sqlite3_bind_int64
 _sqlite3_bind_null
 _sqlite3_bind_parameter_count
 _sqlite3_bind_parameter_index
+_sqlite3_bind_pointer
 _sqlite3_bind_text
+_sqlite3_busy_handler
 _sqlite3_busy_timeout
 _sqlite3_changes
 _sqlite3_changes64
 _sqlite3_clear_bindings
 _sqlite3_close_v2
+_sqlite3_collation_needed
 _sqlite3_column_blob
 _sqlite3_column_bytes
 _sqlite3_column_count
@@ -24,14 +27,21 @@ _sqlite3_column_text
 _sqlite3_column_type
 _sqlite3_compileoption_get
 _sqlite3_compileoption_used
+_sqlite3_complete
+_sqlite3_create_collation
+_sqlite3_create_collation_v2
 _sqlite3_create_function
 _sqlite3_create_function_v2
+_sqlite3_create_module
+_sqlite3_create_module_v2
 _sqlite3_create_window_function
 _sqlite3_data_count
 _sqlite3_db_filename
 _sqlite3_db_handle
 _sqlite3_db_name
+_sqlite3_declare_vtab
 _sqlite3_deserialize
+_sqlite3_drop_modules
 _sqlite3_errmsg
 _sqlite3_error_offset
 _sqlite3_errstr
@@ -42,6 +52,7 @@ _sqlite3_extended_result_codes
 _sqlite3_file_control
 _sqlite3_finalize
 _sqlite3_free
+_sqlite3_get_auxdata
 _sqlite3_initialize
 _sqlite3_libversion
 _sqlite3_libversion_number
@@ -50,6 +61,7 @@ _sqlite3_malloc64
 _sqlite3_msize
 _sqlite3_open
 _sqlite3_open_v2
+_sqlite3_overload_function
 _sqlite3_prepare_v2
 _sqlite3_prepare_v3
 _sqlite3_randomness
@@ -65,16 +77,20 @@ _sqlite3_result_error_toobig
 _sqlite3_result_int
 _sqlite3_result_int64
 _sqlite3_result_null
+_sqlite3_result_pointer
 _sqlite3_result_text
 _sqlite3_result_zeroblob
 _sqlite3_result_zeroblob64
 _sqlite3_serialize
+_sqlite3_set_auxdata
 _sqlite3_shutdown
 _sqlite3_sourceid
 _sqlite3_sql
 _sqlite3_step
 _sqlite3_strglob
+_sqlite3_stricmp
 _sqlite3_strlike
+_sqlite3_strnicmp
 _sqlite3_total_changes
 _sqlite3_total_changes64
 _sqlite3_trace_v2
@@ -88,11 +104,20 @@ _sqlite3_value_bytes
 _sqlite3_value_double
 _sqlite3_value_int
 _sqlite3_value_int64
+_sqlite3_value_pointer
 _sqlite3_value_text
 _sqlite3_value_type
 _sqlite3_vfs_find
 _sqlite3_vfs_register
 _sqlite3_vfs_unregister
+_sqlite3_vtab_collation
+_sqlite3_vtab_distinct
+_sqlite3_vtab_in
+_sqlite3_vtab_in_first
+_sqlite3_vtab_in_next
+_sqlite3_vtab_nochange
+_sqlite3_vtab_on_conflict
+_sqlite3_vtab_rhs_value
 _malloc
 _free
 _realloc

ext/wasm/api/README.md

@@ -78,11 +78,10 @@ browser client:
       a Promise-based interface into the Worker #1 API. This is
       a far user-friendlier way to interface with databases running
       in a Worker thread.
-- **`sqlite3-vfs-helper.js`**\  
+- **`sqlite3-v-helper.js`**\  
-  This internal-use-only file installs `sqlite3.VfsHelper` for use by
+  Installs `sqlite3.VfsHelper` and `sqlite3.VtabHelper` for use by
-  `sqlite3-*.js` files which create `sqlite3_vfs` implementations.
+  downstream code which creates `sqlite3_vfs` and `sqlite3_module`
-  `sqlite3.VfsHelper` gets removed from the the `sqlite3` object after
+  implementations.
-  the library is finished initializing.
 - **`sqlite3-vfs-opfs.c-pp.js`**\  
   is an sqlite3 VFS implementation which supports Google Chrome's
   Origin-Private FileSystem (OPFS) as a storage layer to provide

ext/wasm/api/sqlite3-api-glue.js

@@ -31,33 +31,50 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
     heap: 0 ? wasm.memory : wasm.heap8u,
     alloc: wasm.alloc,
     dealloc: wasm.dealloc,
-    functionTable: wasm.functionTable,
     bigIntEnabled: wasm.bigIntEnabled,
-    memberPrefix: '$'
+    memberPrefix: /* Never change this: this prefix is baked into any
+                     amount of code and client-facing docs. */ '$'
   });
   delete self.Jaccwabyt;
 
-  if(0){
-    /*  "The problem" is that the following isn't even remotely
-        type-safe. OTOH, nothing about WASM pointers is. */
-    const argPointer = wasm.xWrap.argAdapter('*');
-    wasm.xWrap.argAdapter('StructType', (v)=>{
-      if(v && v.constructor && v instanceof StructBinder.StructType){
-        v = v.pointer;
-      }
-      return wasm.isPtr(v)
-        ? argPointer(v)
-        : toss("Invalid (object) type for StructType-type argument.");
-    });
-  }
-
   {/* Convert Arrays and certain TypedArrays to strings for
-      'flexible-string'-type arguments */
+      'string:flexible'-type arguments */
     const xString = wasm.xWrap.argAdapter('string');
     wasm.xWrap.argAdapter(
-      'flexible-string', (v)=>xString(util.flexibleString(v))
+      'string:flexible', (v)=>xString(util.flexibleString(v))
     );
-  }
+
+    /**
+       The 'string:static' argument adapter treats its argument as
+       either...
+
+       - WASM pointer: assumed to be a long-lived C-string which gets
+         returned as-is.
+
+       - Anything else: gets coerced to a JS string for use as a map
+         key. If a matching entry is found (as described next), it is
+         returned, else wasm.allocCString() is used to create a a new
+         string, map its pointer to (''+v) for the remainder of the
+         application's life, and returns that pointer value for this
+         call and all future calls which are passed a
+         string-equivalent argument.
+
+       Use case: sqlite3_bind_pointer() and sqlite3_result_pointer()
+       call for "a static string and preferably a string
+       literal". This converter is used to ensure that the string
+       value seen by those functions is long-lived and behaves as they
+       need it to.
+    */
+    wasm.xWrap.argAdapter(
+      'string:static',
+      function(v){
+        if(wasm.isPtr(v)) return v;
+        v = ''+v;
+        let rc = this[v];
+        return rc || (rc = this[v] = wasm.allocCString(v));
+      }.bind(Object.create(null))
+    );
+  }/* special-case string-type argument conversions */
   
   if(1){// WhWasmUtil.xWrap() bindings...
     /**
@@ -68,15 +85,21 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
        `sqlite3_vfs*` via capi.sqlite3_vfs.pointer.
     */
     const aPtr = wasm.xWrap.argAdapter('*');
+    const nilType = function(){};
     wasm.xWrap.argAdapter('sqlite3_filename', aPtr)
     ('sqlite3_stmt*', aPtr)
     ('sqlite3_context*', aPtr)
     ('sqlite3_value*', aPtr)
     ('void*', aPtr)
-    ('sqlite3*', (v)=>{
+    ('sqlite3*', (v)=>
-      if(sqlite3.oo1 && v instanceof sqlite3.oo1.DB) v = v.pointer;
+      aPtr((v instanceof (sqlite3?.oo1?.DB || nilType))
-      return aPtr(v);
+           ? v.pointer : v))
-    })
+    ('sqlite3_index_info*', (v)=>
+      aPtr((v instanceof (capi.sqlite3_index_info || nilType))
+           ? v.pointer : v))
+    ('sqlite3_module*', (v)=>
+      aPtr((v instanceof (capi.sqlite3_module || nilType))
+           ? v.pointer : v))
     /**
        `sqlite3_vfs*`:
 
@@ -87,14 +110,13 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
     */
     ('sqlite3_vfs*', (v)=>{
       if('string'===typeof v){
-        const x = capi.sqlite3_vfs_find(v);
         /* A NULL sqlite3_vfs pointer will be treated as the default
            VFS in many contexts. We specifically do not want that
            behavior here. */
-        if(!x) sqlite3.SQLite3Error.toss("Unknown sqlite3_vfs name:",v);
+        return capi.sqlite3_vfs_find(v)
-        return x;
+          || sqlite3.SQLite3Error.toss("Unknown sqlite3_vfs name:",v);
-      }else if(v instanceof sqlite3.capi.sqlite3_vfs) v = v.pointer;
+      }
-      return aPtr(v);
+      return aPtr((v instanceof capi.sqlite3_vfs) ? v.pointer : v);
     });
 
     wasm.xWrap.resultAdapter('sqlite3*', aPtr)
@@ -127,7 +149,7 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
         : fI64Disabled(e[0]);
     }
 
-    /* There's no(?) need to expose bindingSignatures to clients,
+    /* There's no need to expose bindingSignatures to clients,
        implicitly making it part of the public interface. */
     delete wasm.bindingSignatures;
 
@@ -141,21 +163,8 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
         return errCode;
       };
     }
-
   }/*xWrap() bindings*/;
 
-  /**
-     When registering a VFS and its related components it may be
-     necessary to ensure that JS keeps a reference to them to keep
-     them from getting garbage collected. Simply pass each such value
-     to this function and a reference will be held to it for the life
-     of the app.
-  */
-  capi.sqlite3_vfs_register.addReference = function f(...args){
-    if(!f._) f._ = [];
-    f._.push(...args);
-  };
-
   /**
      Internal helper to assist in validating call argument counts in
      the hand-written sqlite3_xyz() wrappers. We do this only for
@@ -167,29 +176,9 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
                                               (1===n?"":'s')+".");
   };
 
-  /**
-     Helper for flexible-string conversions which require a
-     byte-length counterpart argument. Passed a value and its
-     ostensible length, this function returns [V,N], where V
-     is either v or a transformed copy of v and N is either n,
-     -1, or the byte length of v (if it's a byte array).
-  */
-  const __flexiString = function(v,n){
-    if('string'===typeof v){
-      n = -1;
-    }else if(util.isSQLableTypedArray(v)){
-      n = v.byteLength;
-      v = util.typedArrayToString(v);
-    }else if(Array.isArray(v)){
-      v = v.join("");
-      n = -1;
-    }
-    return [v, n];
-  };
-
   if(1){/* Special-case handling of sqlite3_exec() */
     const __exec = wasm.xWrap("sqlite3_exec", "int",
-                              ["sqlite3*", "flexible-string", "*", "*", "**"]);
+                              ["sqlite3*", "string:flexible", "*", "*", "**"]);
     /* Documented in the api object's initializer. */
     capi.sqlite3_exec = function f(pDb, sql, callback, pVoid, pErrMsg){
       if(f.length!==arguments.length){
@@ -204,8 +193,8 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
         try {
           let aVals = [], aNames = [], i = 0, offset = 0;
           for( ; i < nCols; offset += (wasm.ptrSizeof * ++i) ){
-            aVals.push( wasm.cstringToJs(wasm.getPtrValue(pColVals + offset)) );
+            aVals.push( wasm.cstrToJs(wasm.getPtrValue(pColVals + offset)) );
-            aNames.push( wasm.cstringToJs(wasm.getPtrValue(pColNames + offset)) );
+            aNames.push( wasm.cstrToJs(wasm.getPtrValue(pColNames + offset)) );
           }
           rc = callback(pVoid, nCols, aVals, aNames) | 0;
           /* The first 2 args of the callback are useless for JS but
@@ -540,6 +529,26 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
 
   if(1){/* Special-case handling of sqlite3_prepare_v2() and
            sqlite3_prepare_v3() */
+    /**
+       Helper for string:flexible conversions which require a
+       byte-length counterpart argument. Passed a value and its
+       ostensible length, this function returns [V,N], where V
+       is either v or a transformed copy of v and N is either n,
+       -1, or the byte length of v (if it's a byte array).
+    */
+    const __flexiString = (v,n)=>{
+      if('string'===typeof v){
+        n = -1;
+      }else if(util.isSQLableTypedArray(v)){
+        n = v.byteLength;
+        v = util.typedArrayToString(v);
+      }else if(Array.isArray(v)){
+        v = v.join("");
+        n = -1;
+      }
+      return [v, n];
+    };
+
     /**
        Scope-local holder of the two impls of sqlite3_prepare_v2/v3().
     */
@@ -570,7 +579,7 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
                                 "int", ["sqlite3*", "*", "int", "int",
                                         "**", "**"]);
 
-    /* Documented in the api object's initializer. */
+    /* Documented in the capi object's initializer. */
     capi.sqlite3_prepare_v3 = function f(pDb, sql, sqlLen, prepFlags, ppStmt, pzTail){
       if(f.length!==arguments.length){
         return __dbArgcMismatch(pDb,"sqlite3_prepare_v3",f.length);
@@ -587,7 +596,7 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
       }
     };
 
-    /* Documented in the api object's initializer. */
+    /* Documented in the capi object's initializer. */
     capi.sqlite3_prepare_v2 = function f(pDb, sql, sqlLen, ppStmt, pzTail){
       return (f.length===arguments.length)
         ? capi.sqlite3_prepare_v3(pDb, sql, sqlLen, 0, ppStmt, pzTail)
@@ -601,15 +610,19 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
       toss("Maintenance required: increase sqlite3_wasm_enum_json()'s",
            "static buffer size!");
     }
-    wasm.ctype = JSON.parse(wasm.cstringToJs(cJson));
+    wasm.ctype = JSON.parse(wasm.cstrToJs(cJson));
     //console.debug('wasm.ctype length =',wasm.cstrlen(cJson));
-    for(const t of ['access', 'blobFinalizers', 'dataTypes',
+    const defineGroups = ['access', 'authorizer',
-                    'encodings', 'fcntl', 'flock', 'ioCap',
+                          'blobFinalizers', 'dataTypes',
-                    'limits',
+                          'encodings', 'fcntl', 'flock', 'ioCap',
-                    'openFlags', 'prepareFlags', 'resultCodes',
+                          'limits', 'openFlags',
-                    'serialize', 'syncFlags', 'trace', 'udfFlags',
+                          'prepareFlags', 'resultCodes',
-                    'version'
+                          'serialize', 'syncFlags', 'trace', 'udfFlags',
-                   ]){
+                          'version' ];
+    if(wasm.bigIntEnabled){
+      defineGroups.push('vtab');
+    }
+    for(const t of defineGroups){
       for(const e of Object.entries(wasm.ctype[t])){
         // ^^^ [k,v] there triggers a buggy code transformation via
         // one of the Emscripten-driven optimizers.
@@ -629,19 +642,37 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
     capi.sqlite3_js_rc_str = (rc)=>__rcMap[rc];
     /* Bind all registered C-side structs... */
     const notThese = Object.assign(Object.create(null),{
-      // Structs NOT to register
+      // For each struct to NOT register, map its name to true:
-      WasmTestStruct: true
+      WasmTestStruct: true,
+      /* We unregister the kvvfs VFS from Worker threads below. */
+      sqlite3_kvvfs_methods: !util.isUIThread(),
+      /* sqlite3_index_info and friends require int64: */
+      sqlite3_index_info: !wasm.bigIntEnabled,
+      sqlite3_index_constraint: !wasm.bigIntEnabled,
+      sqlite3_index_orderby: !wasm.bigIntEnabled,
+      sqlite3_index_constraint_usage: !wasm.bigIntEnabled
     });
-    if(!util.isUIThread()){
-      /* We remove the kvvfs VFS from Worker threads below. */
-      notThese.sqlite3_kvvfs_methods = true;
-    }
     for(const s of wasm.ctype.structs){
       if(!notThese[s.name]){
         capi[s.name] = sqlite3.StructBinder(s);
       }
     }
-  }/*end C constant imports*/
+    if(capi.sqlite3_index_info){
+      /* Move these inner structs into sqlite3_index_info.  Binding
+      ** them to WASM requires that we create global-scope structs to
+      ** model them with, but those are no longer needed after we've
+      ** passed them to StructBinder. */
+      for(const k of ['sqlite3_index_constraint',
+                      'sqlite3_index_orderby',
+                      'sqlite3_index_constraint_usage']){
+        capi.sqlite3_index_info[k] = capi[k];
+        delete capi[k];
+      }
+      capi.sqlite3_vtab_config =
+        (pDb, op, arg=0)=>wasm.exports.sqlite3_wasm_vtab_config(
+          wasm.xWrap.argAdapter('sqlite3*')(pDb), op, arg);
+    }/* end vtab-related setup */
+  }/*end C constant and struct imports*/
 
   const pKvvfs = capi.sqlite3_vfs_find("kvvfs");
   if( pKvvfs ){/* kvvfs-specific glue */
@@ -652,8 +683,7 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
       delete capi.sqlite3_kvvfs_methods;
 
       const kvvfsMakeKey = wasm.exports.sqlite3_wasm_kvvfsMakeKeyOnPstack,
-            pstack = wasm.pstack,
+            pstack = wasm.pstack;
-            pAllocRaw = wasm.exports.sqlite3_wasm_pstack_alloc;
 
       const kvvfsStorage = (zClass)=>
             ((115/*=='s'*/===wasm.getMemValue(zClass))
@@ -672,7 +702,7 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
           try {
             const zXKey = kvvfsMakeKey(zClass,zKey);
             if(!zXKey) return -3/*OOM*/;
-            const jKey = wasm.cstringToJs(zXKey);
+            const jKey = wasm.cstrToJs(zXKey);
             const jV = kvvfsStorage(zClass).getItem(jKey);
             if(!jV) return -1;
             const nV = jV.length /* Note that we are relying 100% on v being
@@ -701,8 +731,8 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
           try {
             const zXKey = kvvfsMakeKey(zClass,zKey);
             if(!zXKey) return 1/*OOM*/;
-            const jKey = wasm.cstringToJs(zXKey);
+            const jKey = wasm.cstrToJs(zXKey);
-            kvvfsStorage(zClass).setItem(jKey, wasm.cstringToJs(zData));
+            kvvfsStorage(zClass).setItem(jKey, wasm.cstrToJs(zData));
             return 0;
           }catch(e){
             console.error("kvstorageWrite()",e);
@@ -716,7 +746,7 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
           try {
             const zXKey = kvvfsMakeKey(zClass,zKey);
             if(!zXKey) return 1/*OOM*/;
-            kvvfsStorage(zClass).removeItem(wasm.cstringToJs(zXKey));
+            kvvfsStorage(zClass).removeItem(wasm.cstrToJs(zXKey));
             return 0;
           }catch(e){
             console.error("kvstorageDelete()",e);

ext/wasm/api/sqlite3-api-oo1.js

@@ -73,7 +73,7 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
           if(capi.SQLITE_TRACE_STMT===t){
             // x == SQL, p == sqlite3_stmt*
             console.log("SQL TRACE #"+(++this.counter),
-                        wasm.cstringToJs(x));
+                        wasm.cstrToJs(x));
           }
         }.bind({counter: 0}));
 
@@ -139,7 +139,7 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
       console.error("Invalid DB ctor args",opt,arguments);
       toss3("Invalid arguments for DB constructor.");
     }
-    let fnJs = ('number'===typeof fn) ? wasm.cstringToJs(fn) : fn;
+    let fnJs = ('number'===typeof fn) ? wasm.cstrToJs(fn) : fn;
     const vfsCheck = ctor._name2vfs[fnJs];
     if(vfsCheck){
       vfsName = vfsCheck.vfs;
@@ -192,13 +192,13 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
   /**
      Sets SQL which should be exec()'d on a DB instance after it is
      opened with the given VFS pointer. The SQL may be any type
-     supported by the "flexible-string" function argument
+     supported by the "string:flexible" function argument conversion.
-     conversion. Alternately, the 2nd argument may be a function, in
+     Alternately, the 2nd argument may be a function, in which case it
-     which case it is called with (theOo1DbObject,sqlite3Namespace) at
+     is called with (theOo1DbObject,sqlite3Namespace) at the end of
-     the end of the DB() constructor. The function must throw on
+     the DB() constructor. The function must throw on error, in which
-     error, in which case the db is closed and the exception is
+     case the db is closed and the exception is propagated.  This
-     propagated.  This function is intended only for use by DB
+     function is intended only for use by DB subclasses or sqlite3_vfs
-     subclasses or sqlite3_vfs implementations.
+     implementations.
   */
   dbCtorHelper.setVfsPostOpenSql = function(pVfs, sql){
     __vfsPostOpenSql[pVfs] = sql;
@@ -473,6 +473,15 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
     return rc;
   };
 
+  /**
+     Internal impl of the DB.selectArrays() and
+     selectObjects() methods.
+  */
+  const __selectAll =
+        (db, sql, bind, rowMode)=>db.exec({
+          sql, bind, rowMode, returnValue: 'resultRows'
+        });
+
   /**
      Expects to be given a DB instance or an `sqlite3*` pointer (may
      be null) and an sqlite3 API result code. If the result code is
@@ -511,10 +520,12 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
        db is closed but before auxiliary state like this.filename is
        cleared.
 
-       Both onclose handlers are passed this object. If this db is not
+       Both onclose handlers are passed this object, with the onclose
-       opened, neither of the handlers are called. Any exceptions the
+       object as their "this," noting that the db will have been
-       handlers throw are ignored because "destructors must not
+       closed when onclose.after is called. If this db is not opened
-       throw."
+       when close() is called, neither of the handlers are called. Any
+       exceptions the handlers throw are ignored because "destructors
+       must not throw."
 
        Note that garbage collection of a db handle, if it happens at
        all, will never trigger close(), so onclose handlers are not a
@@ -591,7 +602,7 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
       );
       if(pVfs){
         const v = new capi.sqlite3_vfs(pVfs);
-        try{ rc = wasm.cstringToJs(v.$zName) }
+        try{ rc = wasm.cstrToJs(v.$zName) }
         finally { v.dispose() }
       }
       return rc;        
@@ -1098,6 +1109,26 @@ self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
       return __selectFirstRow(this, sql, bind, {});
     },
 
+    /**
+       Runs the given SQL and returns an array of all results, with
+       each row represented as an array, as per the 'array' `rowMode`
+       option to `exec()`. An empty result set resolves
+       to an empty array. The second argument, if any, is treated as
+       the 'bind' option to a call to exec().
+    */
+    selectArrays: function(sql,bind){
+      return __selectAll(this, sql, bind, 'array');
+    },
+
+    /**
+       Works identically to selectArrays() except that each value
+       in the returned array is an object, as per the 'object' `rowMode`
+       option to `exec()`.
+    */
+    selectObjects: function(sql,bind){
+      return __selectAll(this, sql, bind, 'object');
+    },
+
     /**
        Returns the number of currently-opened Stmt handles for this db
        handle, or 0 if this DB instance is closed.

ext/wasm/api/sqlite3-api-prologue.js

@@ -185,28 +185,49 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
     /**
        Constructs this object with a message depending on its arguments:
 
-       - If it's passed only a single integer argument, it is assumed
+       If its first argument is an integer, it is assumed to be
-       to be an sqlite3 C API result code. The message becomes the
+       an SQLITE_... result code and it is passed to
-       result of sqlite3.capi.sqlite3_js_rc_str() or (if that returns
+       sqlite3.capi.sqlite3_js_rc_str() to stringify it.
-       falsy) a synthesized string which contains that integer.
 
-       - If passed 2 arguments and the 2nd is a object, it behaves
+       If called with exactly 2 arguments and the 2nd is an object,
-       like the Error(string,object) constructor except that the first
+       that object is treated as the 2nd argument to the parent
-       argument is subject to the is-integer semantics from the
+       constructor.
-       previous point.
 
-       - Else all arguments are concatenated with a space between each
+       The exception's message is created by concatenating its
-       one, using args.join(' '), to create the error message.
+       arguments with a space between each, except for the
+       two-args-with-an-objec form and that the first argument will
+       get coerced to a string, as described above, if it's an
+       integer.
+
+       If passed an integer first argument, the error object's
+       `resultCode` member will be set to the given integer value,
+       else it will be set to capi.SQLITE_ERROR.
     */
     constructor(...args){
-      if(1===args.length && __isInt(args[0])){
+      let rc;
-        super(__rcStr(args[0]));
+      if(args.length){
-      }else if(2===args.length && 'object'===typeof args[1]){
+        if(__isInt(args[0])){
-        if(__isInt(args[0])) super(__rcStr(args[0]), args[1]);
+          rc = args[0];
-        else super(...args);
+          if(1===args.length){
-      }else{
+            super(__rcStr(args[0]));
-        super(args.join(' '));
+          }else{
+            const rcStr = __rcStr(rc);
+            if('object'===typeof args[1]){
+              super(rcStr,args[1]);
+            }else{
+              args[0] = rcStr+':';
+              super(args.join(' '));
+            }
+          }
+        }else{
+          if(2===args.length && 'object'===typeof args[1]){
+            super(...args);
+          }else{
+            super(args.join(' '));
+          }
+        }
       }
+      this.resultCode = rc || capi.SQLITE_ERROR;
       this.name = 'SQLite3Error';
     }
   };
@@ -348,13 +369,13 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
   /**
      If v is-a Array, its join("") result is returned.  If
      isSQLableTypedArray(v) is true then typedArrayToString(v) is
-     returned. If it looks like a WASM pointer, wasm.cstringToJs(v) is
+     returned. If it looks like a WASM pointer, wasm.cstrToJs(v) is
      returned. Else v is returned as-is.
   */
   const flexibleString = function(v){
     if(isSQLableTypedArray(v)) return typedArrayToString(v);
     else if(Array.isArray(v)) return v.join("");
-    else if(wasm.isPtr(v)) v = wasm.cstringToJs(v);
+    else if(wasm.isPtr(v)) v = wasm.cstrToJs(v);
     return v;
   };
 
@@ -602,7 +623,7 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
        If the callback is not a JS function then this binding performs
        no translation of the callback, but the sql argument is still
        converted to a WASM string for the call using the
-       "flexible-string" argument converter.
+       "string:flexible" argument converter.
     */
     sqlite3_exec: (pDb, sql, callback, pVoid, pErrMsg)=>{}/*installed later*/,
 
@@ -884,16 +905,23 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
     ["sqlite3_bind_null",undefined, "sqlite3_stmt*", "int"],
     ["sqlite3_bind_parameter_count", "int", "sqlite3_stmt*"],
     ["sqlite3_bind_parameter_index","int", "sqlite3_stmt*", "string"],
+    ["sqlite3_bind_pointer", "int",
+     "sqlite3_stmt*", "int", "*", "string:static", "*"],
     ["sqlite3_bind_text","int", "sqlite3_stmt*", "int", "string", "int", "int"
      /* We should arguably create a hand-written binding of
         bind_text() which does more flexible text conversion, along
         the lines of sqlite3_prepare_v3(). The slightly problematic
         part is the final argument (text destructor). */
     ],
+    //["sqlite3_busy_handler","int", "sqlite3*", "*", "*"],
+    // ^^^^ TODO: custom binding which auto-converts JS function arg
+    // to a WASM function, noting that calling it multiple times
+    // would introduce a leak.
     ["sqlite3_busy_timeout","int", "sqlite3*", "int"],
     ["sqlite3_close_v2", "int", "sqlite3*"],
     ["sqlite3_changes", "int", "sqlite3*"],
     ["sqlite3_clear_bindings","int", "sqlite3_stmt*"],
+    ["sqlite3_collation_needed", "int", "sqlite3*", "*", "*"/*=>v(ppis)*/],
     ["sqlite3_column_blob","*", "sqlite3_stmt*", "int"],
     ["sqlite3_column_bytes","int", "sqlite3_stmt*", "int"],
     ["sqlite3_column_count", "int", "sqlite3_stmt*"],
@@ -904,9 +932,16 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
     ["sqlite3_column_type","int", "sqlite3_stmt*", "int"],
     ["sqlite3_compileoption_get", "string", "int"],
     ["sqlite3_compileoption_used", "int", "string"],
+    ["sqlite3_complete", "int", "string:flexible"],
     /* sqlite3_create_function(), sqlite3_create_function_v2(), and
        sqlite3_create_window_function() use hand-written bindings to
        simplify handling of their function-type arguments. */
+    ["sqlite3_create_collation", "int",
+     "sqlite3*", "string", "int"/*SQLITE_UTF8 is the only legal value*/,
+     "*", "*"],
+    ["sqlite3_create_collation_v2", "int",
+     "sqlite3*", "string", "int"/*SQLITE_UTF8 is the only legal value*/,
+     "*", "*", "*"],
     ["sqlite3_data_count", "int", "sqlite3_stmt*"],
     ["sqlite3_db_filename", "string", "sqlite3*", "string"],
     ["sqlite3_db_handle", "sqlite3*", "sqlite3_stmt*"],
@@ -928,6 +963,7 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
     ["sqlite3_file_control", "int", "sqlite3*", "string", "int", "*"],
     ["sqlite3_finalize", "int", "sqlite3_stmt*"],
     ["sqlite3_free", undefined,"*"],
+    ["sqlite3_get_auxdata", "*", "sqlite3_context*", "int"],
     ["sqlite3_initialize", undefined],
     /*["sqlite3_interrupt", undefined, "sqlite3*"
        ^^^ we cannot actually currently support this because JS is
@@ -945,23 +981,28 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
        the range of supported argument types. */
     ["sqlite3_realloc", "*","*","int"],
     ["sqlite3_reset", "int", "sqlite3_stmt*"],
-    ["sqlite3_result_blob",undefined, "sqlite3_context*", "*", "int", "*"],
+    ["sqlite3_result_blob", undefined, "sqlite3_context*", "*", "int", "*"],
-    ["sqlite3_result_double",undefined, "sqlite3_context*", "f64"],
+    ["sqlite3_result_double", undefined, "sqlite3_context*", "f64"],
-    ["sqlite3_result_error",undefined, "sqlite3_context*", "string", "int"],
+    ["sqlite3_result_error", undefined, "sqlite3_context*", "string", "int"],
     ["sqlite3_result_error_code", undefined, "sqlite3_context*", "int"],
     ["sqlite3_result_error_nomem", undefined, "sqlite3_context*"],
     ["sqlite3_result_error_toobig", undefined, "sqlite3_context*"],
-    ["sqlite3_result_int",undefined, "sqlite3_context*", "int"],
+    ["sqlite3_result_int", undefined, "sqlite3_context*", "int"],
-    ["sqlite3_result_null",undefined, "sqlite3_context*"],
+    ["sqlite3_result_null", undefined, "sqlite3_context*"],
-    ["sqlite3_result_text",undefined, "sqlite3_context*", "string", "int", "*"],
+    ["sqlite3_result_pointer", undefined,
+     "sqlite3_context*", "*", "string:static", "*"],
+    ["sqlite3_result_text", undefined, "sqlite3_context*", "string", "int", "*"],
     ["sqlite3_result_zeroblob", undefined, "sqlite3_context*", "int"],
     ["sqlite3_serialize","*", "sqlite3*", "string", "*", "int"],
+    ["sqlite3_set_auxdata", undefined, "sqlite3_context*", "int", "*", "*"/* => v(*) */],
     ["sqlite3_shutdown", undefined],
     ["sqlite3_sourceid", "string"],
     ["sqlite3_sql", "string", "sqlite3_stmt*"],
     ["sqlite3_step", "int", "sqlite3_stmt*"],
     ["sqlite3_strglob", "int", "string","string"],
-    ["sqlite3_strlike", "int", "string","string","int"],
+    ["sqlite3_stricmp", "int", "string", "string"],
+    ["sqlite3_strlike", "int", "string", "string","int"],
+    ["sqlite3_strnicmp", "int", "string", "string", "int"],
     ["sqlite3_trace_v2", "int", "sqlite3*", "int", "*", "*"],
     ["sqlite3_total_changes", "int", "sqlite3*"],
     /* Note sqlite3_uri_...() has very specific requirements
@@ -975,6 +1016,7 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
     ["sqlite3_value_bytes","int", "sqlite3_value*"],
     ["sqlite3_value_double","f64", "sqlite3_value*"],
     ["sqlite3_value_int","int", "sqlite3_value*"],
+    ["sqlite3_value_pointer", "*", "sqlite3_value*", "string:static"],
     ["sqlite3_value_text", "string", "sqlite3_value*"],
     ["sqlite3_value_type", "int", "sqlite3_value*"],
     ["sqlite3_vfs_find", "*", "string"],
@@ -993,19 +1035,40 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
      Functions which require BigInt (int64) support are separated from
      the others because we need to conditionally bind them or apply
      dummy impls, depending on the capabilities of the environment.
+
+     Note that not all of these functions directly require int64
+     but are only for use with APIs which require int64. For example,
+     the vtab-related functions.
   */
   wasm.bindingSignatures.int64 = [
     ["sqlite3_bind_int64","int", ["sqlite3_stmt*", "int", "i64"]],
     ["sqlite3_changes64","i64", ["sqlite3*"]],
     ["sqlite3_column_int64","i64", ["sqlite3_stmt*", "int"]],
+    ["sqlite3_create_module", "int",
+     ["sqlite3*","string","sqlite3_module*","*"]],
+    ["sqlite3_create_module_v2", "int",
+     ["sqlite3*","string","sqlite3_module*","*","*"]],
+    ["sqlite3_declare_vtab", "int", ["sqlite3*", "string:flexible"]],
+    ["sqlite3_drop_modules", "int", ["sqlite3*", "**"]],
     ["sqlite3_malloc64", "*","i64"],
     ["sqlite3_msize", "i64", "*"],
+    ["sqlite3_overload_function", "int", ["sqlite3*","string","int"]],
     ["sqlite3_realloc64", "*","*", "i64"],
-    ["sqlite3_result_int64",undefined, "*", "i64"],
+    ["sqlite3_result_int64", undefined, "*", "i64"],
     ["sqlite3_result_zeroblob64", "int", "*", "i64"],
     ["sqlite3_total_changes64", "i64", ["sqlite3*"]],
     ["sqlite3_uri_int64", "i64", ["sqlite3_filename", "string", "i64"]],
     ["sqlite3_value_int64","i64", "sqlite3_value*"],
+    ["sqlite3_vtab_collation","string","sqlite3_index_info*","int"],
+    ["sqlite3_vtab_distinct","int", "sqlite3_index_info*"],
+    ["sqlite3_vtab_in","int", "sqlite3_index_info*", "int", "int"],
+    ["sqlite3_vtab_in_first", "int", "sqlite3_value*", "**"],
+    ["sqlite3_vtab_in_next", "int", "sqlite3_value*", "**"],
+    /*["sqlite3_vtab_config" is variadic and requires a hand-written
+      proxy.] */
+    ["sqlite3_vtab_nochange","int", "sqlite3_context*"],
+    ["sqlite3_vtab_on_conflict","int", "sqlite3*"],
+    ["sqlite3_vtab_rhs_value","int", "sqlite3_index_info*", "int", "**"]
   ];
 
   /**
@@ -1297,7 +1360,7 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
     let pVfs = capi.sqlite3_vfs_find(0);
     while(pVfs){
       const oVfs = new capi.sqlite3_vfs(pVfs);
-      rc.push(wasm.cstringToJs(oVfs.$zName));
+      rc.push(wasm.cstrToJs(oVfs.$zName));
       pVfs = oVfs.$pNext;
       oVfs.dispose();
     }
@@ -1600,7 +1663,6 @@ self.sqlite3ApiBootstrap = function sqlite3ApiBootstrap(
              some initializers. Retain them when running in test mode
              so that we can add tests for them. */
           delete sqlite3.util;
-          delete sqlite3.VfsHelper;
           delete sqlite3.StructBinder;
         }
         return sqlite3;

ext/wasm/api/sqlite3-opfs-async-proxy.js

@@ -13,7 +13,7 @@
   A Worker which manages asynchronous OPFS handles on behalf of a
   synchronous API which controls it via a combination of Worker
   messages, SharedArrayBuffer, and Atomics. It is the asynchronous
-  counterpart of the API defined in sqlite3-api-opfs.js.
+  counterpart of the API defined in sqlite3-vfs-opfs.js.
 
   Highly indebted to:
 
@@ -343,16 +343,6 @@ const installAsyncProxy = function(self){
   const affirmNotRO = function(opName,fh){
     if(fh.readOnly) toss(opName+"(): File is read-only: "+fh.filenameAbs);
   };
-  const affirmLocked = function(opName,fh){
-    //if(!fh.syncHandle) toss(opName+"(): File does not have a lock: "+fh.filenameAbs);
-    /**
-       Currently a no-op, as speedtest1 triggers xRead() without a
-       lock (that seems like a bug but it's currently uninvestigated).
-       This means, however, that some OPFS VFS routines may trigger
-       acquisition of a lock but never let it go until xUnlock() is
-       called (which it likely won't be if xLock() was not called).
-    */
-  };
 
   /**
      We track 2 different timers: the "metrics" timer records how much
@@ -393,7 +383,6 @@ const installAsyncProxy = function(self){
   */
   let flagAsyncShutdown = false;
 
-
   /**
      Asynchronous wrappers for sqlite3_vfs and sqlite3_io_methods
      methods, as well as helpers like mkdir(). Maintenance reminder:
@@ -427,11 +416,11 @@ const installAsyncProxy = function(self){
     },
     xAccess: async (filename)=>{
       mTimeStart('xAccess');
-      /* OPFS cannot support the full range of xAccess() queries sqlite3
+      /* OPFS cannot support the full range of xAccess() queries
-         calls for. We can essentially just tell if the file is
+         sqlite3 calls for. We can essentially just tell if the file
-         accessible, but if it is it's automatically writable (unless
+         is accessible, but if it is then it's automatically writable
-         it's locked, which we cannot(?) know without trying to open
+         (unless it's locked, which we cannot(?) know without trying
-         it). OPFS does not have the notion of read-only.
+         to open it). OPFS does not have the notion of read-only.
 
          The return semantics of this function differ from sqlite3's
          xAccess semantics because we are limited in what we can
@@ -519,7 +508,6 @@ const installAsyncProxy = function(self){
       let rc = 0;
       wTimeStart('xFileSize');
       try{
-        affirmLocked('xFileSize',fh);
         const sz = await (await getSyncHandle(fh,'xFileSize')).getSize();
         state.s11n.serialize(Number(sz));
       }catch(e){
@@ -615,7 +603,6 @@ const installAsyncProxy = function(self){
       let rc = 0, nRead;
       const fh = __openFiles[fid];
       try{
-        affirmLocked('xRead',fh);
         wTimeStart('xRead');
         nRead = (await getSyncHandle(fh,'xRead')).read(
           fh.sabView.subarray(0, n),
@@ -659,7 +646,6 @@ const installAsyncProxy = function(self){
       const fh = __openFiles[fid];
       wTimeStart('xTruncate');
       try{
-        affirmLocked('xTruncate',fh);
         affirmNotRO('xTruncate', fh);
         await (await getSyncHandle(fh,'xTruncate')).truncate(size);
       }catch(e){
@@ -696,7 +682,6 @@ const installAsyncProxy = function(self){
       const fh = __openFiles[fid];
       wTimeStart('xWrite');
       try{
-        affirmLocked('xWrite',fh);
         affirmNotRO('xWrite', fh);
         rc = (
           n === (await getSyncHandle(fh,'xWrite'))

ext/wasm/api/sqlite3-v-helper.js

@@ -0,0 +1,599 @@
+/*
+** 2022-11-30
+**
+** The author disclaims copyright to this source code.  In place of a
+** legal notice, here is a blessing:
+**
+** *   May you do good and not evil.
+** *   May you find forgiveness for yourself and forgive others.
+** *   May you share freely, never taking more than you give.
+*/
+
+/**
+   This file installs sqlite3.VfsHelper, and object which exists to
+   assist in the creation of JavaScript implementations of sqlite3_vfs,
+   along with its virtual table counterpart, sqlite3.VtabHelper.
+*/
+'use strict';
+self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
+  const wasm = sqlite3.wasm, capi = sqlite3.capi, toss = sqlite3.util.toss3;
+  const vh = Object.create(null), vt = Object.create(null);
+
+  sqlite3.VfsHelper = vh;
+  sqlite3.VtabHelper = vt;
+
+  const sii = capi.sqlite3_index_info;
+  /**
+     If n is >=0 and less than this.$nConstraint, this function
+     returns either a WASM pointer to the 0-based nth entry of
+     this.$aConstraint (if passed a truthy 2nd argument) or an
+     sqlite3_index_info.sqlite3_index_constraint object wrapping that
+     address (if passed a falsy value or no 2nd argument). Returns a
+     falsy value if n is out of range.
+  */
+  sii.prototype.nthConstraint = function(n, asPtr=false){
+    if(n<0 || n>=this.$nConstraint) return false;
+    const ptr = this.$aConstraint + (
+      sii.sqlite3_index_constraint.structInfo.sizeof * n
+    );
+    return asPtr ? ptr : new sii.sqlite3_index_constraint(ptr);
+  };
+
+  /**
+     Works identically to nthConstraint() but returns state from
+     this.$aConstraintUsage, so returns an
+     sqlite3_index_info.sqlite3_index_constraint_usage instance
+     if passed no 2nd argument or a falsy 2nd argument.
+  */
+  sii.prototype.nthConstraintUsage = function(n, asPtr=false){
+    if(n<0 || n>=this.$nConstraint) return false;
+    const ptr = this.$aConstraintUsage + (
+      sii.sqlite3_index_constraint_usage.structInfo.sizeof * n
+    );
+    return asPtr ? ptr : new sii.sqlite3_index_constraint_usage(ptr);
+  };
+
+  /**
+     If n is >=0 and less than this.$nOrderBy, this function
+     returns either a WASM pointer to the 0-based nth entry of
+     this.$aOrderBy (if passed a truthy 2nd argument) or an
+     sqlite3_index_info.sqlite3_index_orderby object wrapping that
+     address (if passed a falsy value or no 2nd argument). Returns a
+     falsy value if n is out of range.
+  */
+  sii.prototype.nthOrderBy = function(n, asPtr=false){
+    if(n<0 || n>=this.$nOrderBy) return false;
+    const ptr = this.$aOrderBy + (
+      sii.sqlite3_index_orderby.structInfo.sizeof * n
+    );
+    return asPtr ? ptr : new sii.sqlite3_index_orderby(ptr);
+  };
+
+  /**
+     Installs a StructBinder-bound function pointer member of the
+     given name and function in the given StructType target object.
+
+     It creates a WASM proxy for the given function and arranges for
+     that proxy to be cleaned up when tgt.dispose() is called. Throws
+     on the slightest hint of error, e.g. tgt is-not-a StructType,
+     name does not map to a struct-bound member, etc.
+
+     As a special case, if the given function is a pointer, it is
+     assumed to be an existing WASM-bound function pointer and is used
+     as-is with no extra level of proxying or cleanup. Results are
+     undefined if it's a pointer and it's _not_ a function pointer.
+     It is legal to pass a value of 0, indicating a NULL pointer, with
+     the caveat that 0 _is_ a legal function pointer in WASM but it
+     will not be accepted as such _here_. (Justification: the function
+     at address zero must be one which initially came from the WASM
+     module, not a method we want to bind to a virtual table or VFS.)
+
+     This function returns a proxy for itself which is bound to tgt
+     and takes 2 args (name,func). That function returns the same
+     thing as this one, permitting calls to be chained.
+
+     If called with only 1 arg, it has no side effects but returns a
+     func with the same signature as described above.
+
+     ACHTUNG: because we cannot generically know how to transform JS
+     exceptions into result codes, the installed functions do no
+     automatic catching of exceptions. It is critical, to avoid 
+     undefined behavior in the C layer, that methods mapped via
+     this function do not throw. The exception, as it were, to that
+     rule is...
+
+     If applyArgcCheck is true then each JS function (as opposed to
+     function pointers) gets wrapped in a proxy which asserts that it
+     is passed the expected number of arguments, throwing if the
+     argument count does not match expectations. That is only intended
+     for dev-time usage for sanity checking, and will leave the C
+     environment in an undefined state.
+  */
+  vh.installMethod = vt.installMethod = function callee(
+    tgt, name, func, applyArgcCheck = callee.installMethodArgcCheck
+  ){
+    if(!(tgt instanceof sqlite3.StructBinder.StructType)){
+      toss("Usage error: target object is-not-a StructType.");
+    }else if(!(func instanceof Function) && !wasm.isPtr(func)){
+      toss("Usage errror: expecting a Function or WASM pointer to one.");
+    }
+    if(1===arguments.length){
+      return (n,f)=>callee(tgt, n, f, applyArgcCheck);
+    }
+    if(!callee.argcProxy){
+      callee.argcProxy = function(tgt, funcName, func,sig){
+        return function(...args){
+          if(func.length!==arguments.length){
+            toss("Argument mismatch for",
+                 tgt.structInfo.name+"::"+funcName
+                 +": Native signature is:",sig);
+          }
+          return func.apply(this, args);
+        }
+      };
+      /* An ondispose() callback for use with
+         sqlite3.StructBinder-created types. */
+      callee.removeFuncList = function(){
+        if(this.ondispose.__removeFuncList){
+          this.ondispose.__removeFuncList.forEach(
+            (v,ndx)=>{
+              if('number'===typeof v){
+                try{wasm.uninstallFunction(v)}
+                catch(e){/*ignore*/}
+              }
+              /* else it's a descriptive label for the next number in
+                 the list. */
+            }
+          );
+          delete this.ondispose.__removeFuncList;
+        }
+      };
+    }/*static init*/
+    const sigN = tgt.memberSignature(name);
+    if(sigN.length<2){
+      toss("Member",name,"does not have a function pointer signature:",sigN);
+    }
+    const memKey = tgt.memberKey(name);
+    const fProxy = (applyArgcCheck && !wasm.isPtr(func))
+    /** This middle-man proxy is only for use during development, to
+        confirm that we always pass the proper number of
+        arguments. We know that the C-level code will always use the
+        correct argument count. */
+          ? callee.argcProxy(tgt, memKey, func, sigN)
+          : func;
+    if(wasm.isPtr(fProxy)){
+      if(fProxy && !wasm.functionEntry(fProxy)){
+        toss("Pointer",fProxy,"is not a WASM function table entry.");
+      }
+      tgt[memKey] = fProxy;
+    }else{
+      const pFunc = wasm.installFunction(fProxy, tgt.memberSignature(name, true));
+      tgt[memKey] = pFunc;
+      if(!tgt.ondispose) tgt.ondispose = [];
+      else if(!Array.isArray(tgt.ondispose)) tgt.ondispose = [tgt.ondispose];
+      if(!tgt.ondispose || !tgt.ondispose.__removeFuncList){
+        tgt.addOnDispose('ondispose.__removeFuncList handler',
+                         callee.removeFuncList);
+        tgt.ondispose.__removeFuncList = [];
+      }
+      tgt.ondispose.__removeFuncList.push(memKey, pFunc);
+    }
+    return (n,f)=>callee(tgt, n, f, applyArgcCheck);
+  }/*installMethod*/;
+  vh.installMethod.installMethodArgcCheck = false;
+
+  /**
+     Installs methods into the given StructType-type instance. Each
+     entry in the given methods object must map to a known member of
+     the given StructType, else an exception will be triggered.  See
+     installMethod() for more details, including the semantics of the
+     3rd argument.
+
+     As an exception to the above, if any two or more methods in the
+     2nd argument are the exact same function, installMethod() is
+     _not_ called for the 2nd and subsequent instances, and instead
+     those instances get assigned the same method pointer which is
+     created for the first instance. This optimization is primarily to
+     accommodate special handling of sqlite3_module::xConnect and
+     xCreate methods.
+
+     On success, returns this object. Throws on error.
+  */
+  vh.installMethods = vt.installMethods = function(
+    structType, methods, applyArgcCheck = vh.installMethod.installMethodArgcCheck
+  ){
+    const seen = new Map /* map of <Function, memberName> */;
+    for(const k of Object.keys(methods)){
+      const m = methods[k];
+      const prior = seen.get(m);
+      if(prior){
+        const mkey = structType.memberKey(k);
+        structType[mkey] = structType[structType.memberKey(prior)];
+      }else{
+        vh.installMethod(structType, k, m, applyArgcCheck);
+        seen.set(m, k);
+      }
+    }
+    return this;
+  };
+
+  /**
+     Uses sqlite3_vfs_register() to register the
+     sqlite3.capi.sqlite3_vfs-type vfs, which must have already been
+     filled out properly. If the 2nd argument is truthy, the VFS is
+     registered as the default VFS, else it is not.
+
+     On success, returns this object. Throws on error.
+  */
+  vh.registerVfs = function(vfs, asDefault=false){
+    if(!(vfs instanceof sqlite3.capi.sqlite3_vfs)){
+      toss("Expecting a sqlite3_vfs-type argument.");
+    }
+    const rc = capi.sqlite3_vfs_register(vfs.pointer, asDefault ? 1 : 0);
+    if(rc){
+      toss("sqlite3_vfs_register(",vfs,") failed with rc",rc);
+    }
+    if(vfs.pointer !== capi.sqlite3_vfs_find(vfs.$zName)){
+      toss("BUG: sqlite3_vfs_find(vfs.$zName) failed for just-installed VFS",
+           vfs);
+    }
+    return this;
+  };
+
+  /**
+     A wrapper for installMethods() or registerVfs() to reduce
+     installation of a VFS and/or its I/O methods to a single
+     call.
+
+     Accepts an object which contains the properties "io" and/or
+     "vfs", each of which is itself an object with following properties:
+
+     - `struct`: an sqlite3.StructType-type struct. This must be a
+       populated (except for the methods) object of type
+       sqlite3_io_methods (for the "io" entry) or sqlite3_vfs (for the
+       "vfs" entry).
+
+     - `methods`: an object mapping sqlite3_io_methods method names
+       (e.g. 'xClose') to JS implementations of those methods. The JS
+       implementations must be call-compatible with their native
+       counterparts.
+
+     For each of those object, this function passes its (`struct`,
+     `methods`, (optional) `applyArgcCheck`) properties to
+     this.installMethods().
+
+     If the `vfs` entry is set then:
+
+     - Its `struct` property is passed to this.registerVfs(). The
+       `vfs` entry may optionally have an `asDefault` property, which
+       gets passed as the 2nd argument to registerVfs().
+
+     - If `struct.$zName` is falsy and the entry has a string-type
+       `name` property, `struct.$zName` is set to the C-string form of
+       that `name` value before registerVfs() is called.
+
+     On success returns this object. Throws on error.
+  */
+  vh.installVfs = function(opt){
+    let count = 0;
+    const propList = ['io','vfs'];
+    for(const key of propList){
+      const o = opt[key];
+      if(o){
+        ++count;
+        this.installMethods(o.struct, o.methods, !!o.applyArgcCheck);
+        if('vfs'===key){
+          if(!o.struct.$zName && 'string'===typeof o.name){
+            o.struct.addOnDispose(
+              o.struct.$zName = wasm.allocCString(o.name)
+            );
+          }
+          this.registerVfs(o.struct, !!o.asDefault);
+        }
+      }
+    }
+    if(!count) toss("Misuse: installVfs() options object requires at least",
+                    "one of:", propList);
+    return this;
+  };
+
+  /**
+     Expects to be passed the (argc,argv) arguments of
+     sqlite3_module::xFilter(), or an equivalent API.  This function
+     transforms the arguments (an array of (sqlite3_value*)) into a JS
+     array of equivalent JS values. It uses the same type conversions
+     as sqlite3_create_function_v2() and friends. Throws on error,
+     e.g. if it cannot figure out a sensible data conversion.
+  */
+  vt.sqlite3ValuesToJs = capi.sqlite3_create_function_v2.udfConvertArgs;
+
+  /**
+     Factory function for xAbc() impls.
+  */
+  const __xWrapFactory = function(methodName,structType){
+    return function(ptr,removeMapping=false){
+      if(0===arguments.length) ptr = new structType;
+      if(ptr instanceof structType){
+        //T.assert(!this.has(ptr.pointer));
+        this.set(ptr.pointer, ptr);
+        return ptr;
+      }else if(!wasm.isPtr(ptr)){
+        sqlite3.SQLite3Error.toss("Invalid argument to",methodName+"()");
+      }
+      let rc = this.get(ptr);
+      if(removeMapping) this.delete(ptr);
+      return rc;
+    }.bind(new Map);
+  };
+  /**
+     EXPERIMENTAL. DO NOT USE IN CLIENT CODE.
+
+     Has 3 distinct uses:
+
+     - wrapVtab() instantiates a new capi.sqlite3_vtab instance, maps
+       its pointer for later by-pointer lookup, and returns that
+       object. This is intended to be called from
+       sqlite3_module::xConnect() or xCreate() implementations.
+
+     - wrapVtab(pVtab) accepts a WASM pointer to a C-level
+       (sqlite3_vtab*) instance and returns the capi.sqlite3_vtab
+       object created by the first form of this function, or undefined
+       if that form has not been used. This is intended to be called
+       from sqlite3_module methods which take a (sqlite3_vtab*)
+       pointer _except_ for xDestroy() (if there is a distinct
+       xCreate()) or xDisconnect() (if xCreate() is 0 or is the same
+       as xConnect()), in which case use...
+
+     - wrapVtab(pVtab,true) as for the previous form, but removes the
+       pointer-to-object mapping before returning.  The caller must
+       call dispose() on the returned object. This is intended to be
+       called from sqlite3_module::xDisconnect() implementations or
+       in error handling of a failed xCreate() or xConnect().
+ */
+  vt.xVtab = __xWrapFactory('xVtab',capi.sqlite3_vtab);
+
+  /**
+     EXPERIMENTAL. DO NOT USE IN CLIENT CODE.
+
+     Works identically to wrapVtab() except that it deals with
+     sqlite3_cursor objects and pointers instead of sqlite3_vtab.
+
+     - wrapCursor() is intended to be called from sqlite3_module::xOpen()
+
+     - wrapCursor(pCursor) is intended to be called from all sqlite3_module
+       methods which take a (sqlite3_vtab_cursor*) _except_ for
+       xClose(), in which case use...
+
+     - wrapCursor(pCursor, true) will remove the mapping of pCursor to a
+       capi.sqlite3_vtab_cursor object and return that object.  The
+       caller must call dispose() on the returned object. This is
+       intended to be called from xClose() or in error handling of a
+       failed xOpen().
+ */
+  vt.xCursor = __xWrapFactory('xCursor',capi.sqlite3_vtab_cursor);
+
+  /**
+     Convenience form of creating an sqlite3_index_info wrapper,
+     intended for use in xBestIndex implementations. Note that the
+     caller is expected to call dispose() on the returned object
+     before returning. Though not _strictly_ required, as that object
+     does not own the pIdxInfo memory, it is nonetheless good form.
+  */
+  vt.xIndexInfo = (pIdxInfo)=>new capi.sqlite3_index_info(pIdxInfo);
+
+  /**
+     Given an error object, this function returns
+     sqlite3.capi.SQLITE_NOMEM if (e instanceof
+     sqlite3.WasmAllocError), else it returns its
+     second argument. Its intended usage is in the methods
+     of a sqlite3_vfs or sqlite3_module:
+
+     ```
+     try{
+      let rc = ...
+      return rc;
+     }catch(e){
+       return sqlite3.VtabHelper.exceptionToRc(e, sqlite3.capi.SQLITE_XYZ);
+       // where SQLITE_XYZ is some call-appropriate result code.
+     }
+     ```
+  */
+  /**vh.exceptionToRc = vt.exceptionToRc =
+    (e, defaultRc=capi.SQLITE_ERROR)=>(
+      (e instanceof sqlite3.WasmAllocError)
+        ? capi.SQLITE_NOMEM
+        : defaultRc
+    );*/
+
+  /**
+     Given an sqlite3_module method name and error object, this
+     function returns sqlite3.capi.SQLITE_NOMEM if (e instanceof
+     sqlite3.WasmAllocError), else it returns its second argument. Its
+     intended usage is in the methods of a sqlite3_vfs or
+     sqlite3_module:
+
+     ```
+     try{
+      let rc = ...
+      return rc;
+     }catch(e){
+       return sqlite3.VtabHelper.xError(
+                'xColumn', e, sqlite3.capi.SQLITE_XYZ);
+       // where SQLITE_XYZ is some call-appropriate result code.
+     }
+     ```
+
+     If no 3rd argument is provided, its default depends on
+     the error type:
+
+     - An sqlite3.WasmAllocError always resolves to capi.SQLITE_NOMEM.
+
+     - If err is an SQLite3Error then its `resultCode` property
+       is used.
+
+     - If all else fails, capi.SQLITE_ERROR is used.
+
+     If xError.errorReporter is a function, it is called in
+     order to report the error, else the error is not reported.
+     If that function throws, that exception is ignored.
+  */
+  vt.xError = function f(methodName, err, defaultRc){
+    if(f.errorReporter instanceof Function){
+      try{f.errorReporter("sqlite3_module::"+methodName+"(): "+err.message);}
+      catch(e){/*ignored*/}
+    }
+    let rc;
+    if(err instanceof sqlite3.WasmAllocError) rc = capi.SQLITE_NOMEM;
+    else if(arguments.length>2) rc = defaultRc;
+    else if(err instanceof sqlite3.SQLite3Error) rc = err.resultCode;
+    return rc || capi.SQLITE_ERROR;
+  };
+  vt.xError.errorReporter = 1 ? console.error.bind(console) : false;
+
+  /**
+     "The problem" with this is that it introduces an outer function with
+     a different arity than the passed-in method callback. That means we
+     cannot do argc validation on these. Additionally, some methods (namely
+     xConnect) may have call-specific error handling. It would be a shame to
+     hard-coded that per-method support in this function.
+  */
+  /** vt.methodCatcher = function(methodName, method, defaultErrRc=capi.SQLITE_ERROR){
+    return function(...args){
+      try { method(...args); }
+      }catch(e){ return vt.xError(methodName, e, defaultRc) }
+  };
+  */
+
+  /**
+     A helper for sqlite3_vtab::xRowid() implementations. It must be
+     passed that function's 2nd argument and the value for that
+     pointer.  Returns the same as wasm.setMemValue() and will throw
+     if the 1st or 2nd arguments are invalid for that function.
+  */
+  vt.xRowid = (ppRowid64, value)=>wasm.setMemValue(ppRowid64, value, 'i64');
+
+  /**
+     Sets up an sqlite3_module() object for later installation into
+     individual databases using sqlite3_create_module(). Requires an
+     object with the following properties:
+
+     - `methods`: an object containing a mapping of properties with
+       the C-side names of the sqlite3_module methods, e.g. xCreate,
+       xBestIndex, etc., to JS implementations for those functions.
+       Certain special-case handling is performed, as described below.
+
+     - `catchExceptions` (default=false): if truthy, the given methods
+       are not mapped as-is, but are instead wrapped inside wrappers
+       which translate exceptions into result codes of SQLITE_ERROR or
+       SQLITE_NOMEM, depending on whether the exception is an
+       sqlite3.WasmAllocError. In the case of the xConnect and xCreate
+       methods, the exception handler also sets the output error
+       string to the exception's error string.
+
+     - OPTIONAL `struct`: a sqlite3.capi.sqlite3_module() instance. If
+       not set, one will be created automatically and (on success)
+       added to the object.
+
+     - OPTIONAL `iVersion`: if set, it must be an integer value and it
+       gets assigned to the `$iVersion` member of the struct object.
+       If it's _not_ set, and the passed-in `struct` object's `$iVersion`
+       is 0 (the default) then this function attempts to define a value
+       for that property based on the list of methods it has.
+
+     If `catchExceptions` is false, it is up to the client to ensure
+     that no exceptions escape the methods, as doing so would move
+     them through the C API, leading to undefined
+     behavior. (VtabHelper.xError() is intended to assist in reporting
+     such exceptions.)
+
+     If `methods.xConnect` is `true` then the value of
+     `methods.xCreate` is used in its place, and vice versa. This is
+     to facilitate creation of those methods inline in the passed-in
+     object without requiring the client to explicitly get a reference
+     to one of them in order to assign it to the other one. Note that
+     sqlite treats those two functions specially if they are exactly
+     the same function (same pointer value).  The
+     `catchExceptions`-installed handlers will account for identical
+     references to those two functions and will install the same
+     wrapper function for both.
+
+     The given methods are expected to return integer values, as
+     expected by the C API. If `catchExceptions` is truthy, the return
+     value of the wrapped function will be used as-is and will be
+     translated to 0 if the function returns a falsy value (e.g. if it
+     does not have an explicit return). If `catchExceptions` is _not_
+     active, the method implementations must explicitly return integer
+     values.
+
+     Throws on error. Returns the sqlite3_module object on success.
+  */
+  vt.setupModule = function(opt){
+    const mod = opt.struct || new capi.sqlite3_module();
+    try{
+      const methods = opt.methods || toss("Missing 'methods' object.");
+      if(true===methods.xConnect) methods.xConnect = methods.xCreate;
+      else if(true===methods.xCreate) methods.xCreate = methods.xConnect;
+      if(opt.catchExceptions){
+        const fwrap = function(methodName, func){
+          if(['xConnect','xCreate'].indexOf(methodName) >= 0){
+            return function(pDb, pAux, argc, argv, ppVtab, pzErr){
+              try{return func(...arguments) || 0;}
+              catch(e){
+                if(!(e instanceof sqlite3.WasmAllocError)){
+                  wasm.dealloc(wasm.getPtrValue(pzErr));
+                  wasm.setPtrValue(pzErr, wasm.allocCString(e.message));
+                }
+                return vt.xError(methodName, e);
+              }
+            };
+          }else{
+            return function(...args){
+              try{return func(...args) || 0;}
+              catch(e){
+                return vt.xError(methodName, e);
+              }
+            };
+          }
+        };
+        const mnames = [
+          'xCreate', 'xConnect', 'xBestIndex', 'xDisconnect',
+          'xDestroy', 'xOpen', 'xClose', 'xFilter', 'xNext',
+          'xEof', 'xColumn', 'xRowid', 'xUpdate',
+          'xBegin', 'xSync', 'xCommit', 'xRollback',
+          'xFindFunction', 'xRename', 'xSavepoint', 'xRelease',
+          'xRollbackTo', 'xShadowName'
+        ];
+        const remethods = Object.create(null);
+        for(const k of mnames){
+          const m = methods[k];
+          if(!(m instanceof Function)) continue;
+          else if('xConnect'===k && methods.xCreate===m){
+            remethods[k] = methods.xCreate;
+          }else if('xCreate'===k && methods.xConnect===m){
+            remethods[k] = methods.xConnect;
+          }else{
+            remethods[k] = fwrap(k, m);
+          }
+        }
+        this.installMethods(mod, remethods, false);
+      }else{
+        this.installMethods(
+          mod, methods, !!opt.applyArgcCheck/*undocumented option*/
+        );
+      }
+      if(0===mod.$iVersion){
+        let v;
+        if('number'===typeof opt.iVersion) v = opt.iVersion;
+        else if(mod.$xShadowName) v = 3;
+        else if(mod.$xSavePoint || mod.$xRelease || mod.$xRollbackTo) v = 2;
+        else v = 1;
+        mod.$iVersion = v;
+      }
+    }catch(e){
+      if(!opt.struct) mod.dispose();
+      throw e;
+    }
+    if(!opt.struct) opt.struct = mod;
+    return mod;
+  }/*setupModule()*/;
+}/*sqlite3ApiBootstrap.initializers.push()*/);

ext/wasm/api/sqlite3-vfs-helper.js

@@ -1,221 +0,0 @@
-/*
-** 2022-11-30
-**
-** The author disclaims copyright to this source code.  In place of a
-** legal notice, here is a blessing:
-**
-** *   May you do good and not evil.
-** *   May you find forgiveness for yourself and forgive others.
-** *   May you share freely, never taking more than you give.
-*/
-
-/**
-   This file installs sqlite.VfsHelper, an object which exists
-   to assist in the creation of JavaScript implementations of
-   sqlite3_vfs. It is NOT part of the public API, and is an
-   internal implemenation detail for use in this project's
-   own development of VFSes. It may be exposed to clients
-   at some point, provided there is value in doing so.
-*/
-'use strict';
-self.sqlite3ApiBootstrap.initializers.push(function(sqlite3){
-  const wasm = sqlite3.wasm, capi = sqlite3.capi, toss = sqlite3.util.toss;
-  const vh = Object.create(null);
-
-  /**
-     Does nothing more than holds a permanent reference to each
-     argument. This is useful in some cases to ensure that, e.g., a
-     custom sqlite3_io_methods instance does not get
-     garbage-collected.
-
-     Returns this object.
-  */
-  vh.holdReference = function(...args){
-    for(const v of args) this.refs.add(v);
-    return vh;
-  }.bind({refs: new Set});
-  
-  /**
-     Installs a StructBinder-bound function pointer member of the
-     given name and function in the given StructType target object.
-     It creates a WASM proxy for the given function and arranges for
-     that proxy to be cleaned up when tgt.dispose() is called.  Throws
-     on the slightest hint of error, e.g. tgt is-not-a StructType,
-     name does not map to a struct-bound member, etc.
-
-     If applyArgcCheck is true then each method gets wrapped in a
-     proxy which asserts that it is passed the expected number of
-     arguments, throwing if the argument count does not match
-     expectations. That is only recommended for dev-time usage for
-     sanity checking. Once a VFS implementation is known to be
-     working, it is a given that the C API will never call it with the
-     wrong argument count.
-
-     Returns a proxy for this function which is bound to tgt and takes
-     2 args (name,func). That function returns the same thing,
-     permitting calls to be chained.
-
-     If called with only 1 arg, it has no side effects but returns a
-     func with the same signature as described above.
-
-     If tgt.ondispose is set before this is called then it _must_
-     be an array, to which this function will append entries.
-  */
-  vh.installMethod = function callee(tgt, name, func,
-                                     applyArgcCheck=callee.installMethodArgcCheck){
-    if(!(tgt instanceof sqlite3.StructBinder.StructType)){
-      toss("Usage error: target object is-not-a StructType.");
-    }
-    if(1===arguments.length){
-      return (n,f)=>callee(tgt, n, f, applyArgcCheck);
-    }
-    if(!callee.argcProxy){
-      callee.argcProxy = function(func,sig){
-        return function(...args){
-          if(func.length!==arguments.length){
-            toss("Argument mismatch. Native signature is:",sig);
-          }
-          return func.apply(this, args);
-        }
-      };
-      /* An ondispose() callback for use with
-         sqlite3.StructBinder-created types. */
-      callee.removeFuncList = function(){
-        if(this.ondispose.__removeFuncList){
-          this.ondispose.__removeFuncList.forEach(
-            (v,ndx)=>{
-              if('number'===typeof v){
-                try{wasm.uninstallFunction(v)}
-                catch(e){/*ignore*/}
-              }
-              /* else it's a descriptive label for the next number in
-                 the list. */
-            }
-          );
-          delete this.ondispose.__removeFuncList;
-        }
-      };
-    }/*static init*/
-    const sigN = tgt.memberSignature(name);
-    if(sigN.length<2){
-      toss("Member",name," is not a function pointer. Signature =",sigN);
-    }
-    const memKey = tgt.memberKey(name);
-    const fProxy = applyArgcCheck
-    /** This middle-man proxy is only for use during development, to
-        confirm that we always pass the proper number of
-        arguments. We know that the C-level code will always use the
-        correct argument count. */
-          ? callee.argcProxy(func, sigN)
-          : func;
-    const pFunc = wasm.installFunction(fProxy, tgt.memberSignature(name, true));
-    tgt[memKey] = pFunc;
-    if(!tgt.ondispose) tgt.ondispose = [];
-    if(!tgt.ondispose.__removeFuncList){
-      tgt.ondispose.push('ondispose.__removeFuncList handler',
-                         callee.removeFuncList);
-      tgt.ondispose.__removeFuncList = [];
-    }
-    tgt.ondispose.__removeFuncList.push(memKey, pFunc);
-    return (n,f)=>callee(tgt, n, f, applyArgcCheck);
-  }/*installMethod*/;
-  vh.installMethod.installMethodArgcCheck = false;
-
-  /**
-     Installs methods into the given StructType-type object. Each
-     entry in the given methods object must map to a known member of
-     the given StructType, else an exception will be triggered.
-     See installMethod() for more details, including the semantics
-     of the 3rd argument.
-
-     On success, passes its first argument to holdRefence() and
-     returns this object. Throws on error.
-  */
-  vh.installMethods = function(structType, methods,
-                               applyArgcCheck=vh.installMethod.installMethodArgcCheck){
-    for(const k of Object.keys(methods)){
-      vh.installMethod(structType, k, methods[k], applyArgcCheck);
-    }
-    return vh.holdReference(structType);
-  };
-
-  /**
-     Uses sqlite3_vfs_register() to register the
-     sqlite3.capi.sqlite3_vfs-type vfs, which must have already been
-     filled out properly. If the 2nd argument is truthy, the VFS is
-     registered as the default VFS, else it is not.
-
-     On success, passes its first argument to this.holdReference() and
-     returns this object. Throws on error.
-  */
-  vh.registerVfs = function(vfs, asDefault=false){
-    if(!(vfs instanceof sqlite3.capi.sqlite3_vfs)){
-      toss("Expecting a sqlite3_vfs-type argument.");
-    }
-    const rc = capi.sqlite3_vfs_register(vfs.pointer, asDefault ? 1 : 0);
-    if(rc){
-      toss("sqlite3_vfs_register(",vfs,") failed with rc",rc);
-    }
-    if(vfs.pointer !== capi.sqlite3_vfs_find(vfs.$zName)){
-      toss("BUG: sqlite3_vfs_find(vfs.$zName) failed for just-installed VFS",
-           vfs);
-    }
-    return vh.holdReference(vfs);
-  };
-
-  /**
-     A wrapper for installMethods() or registerVfs() to reduce
-     installation of a VFS and/or its I/O methods to a single
-     call.
-
-     Accepts an object which contains the properties "io" and/or
-     "vfs", each of which is itself an object with following properties:
-
-     - `struct`: an sqlite3.StructType-type struct. This must be a
-       populated (except for the methods) object of type
-       sqlite3_io_methods (for the "io" entry) or sqlite3_vfs (for the
-       "vfs" entry).
-
-     - `methods`: an object mapping sqlite3_io_methods method names
-       (e.g. 'xClose') to JS implementations of those methods.
-
-     For each of those object, this function passes its (`struct`,
-     `methods`, (optional) `applyArgcCheck`) properties to
-     this.installMethods().
-
-     If the `vfs` entry is set then:
-
-     - Its `struct` property is passed to this.registerVfs(). The
-       `vfs` entry may optionally have an `asDefault` property, which
-       gets passed as the 2nd argument to registerVfs().
-
-     - If `struct.$zName` is falsy and the entry has a string-type
-       `name` property, `struct.$zName` is set to the C-string form of
-       that `name` value before registerVfs() is called.
-
-     On success returns this object. Throws on error.
-  */
-  vh.installVfs = function(opt){
-    let count = 0;
-    const propList = ['io','vfs'];
-    for(const key of propList){
-      const o = opt[key];
-      if(o){
-        ++count;
-        this.installMethods(o.struct, o.methods, !!o.applyArgcCheck);
-        if('vfs'===key){
-          if(!o.struct.$zName && 'string'===typeof o.name){
-            o.struct.$zName = wasm.allocCString(o.name);
-            /* Note that we leak that C-string. */
-          }
-          this.registerVfs(o.struct, !!o.asDefault);
-        }
-      }
-    }
-    if(!count) toss("Misuse: installVfs() options object requires at least",
-                    "one of:", propList);
-    return this;
-  };
-  
-  sqlite3.VfsHelper = vh;
-}/*sqlite3ApiBootstrap.initializers.push()*/);

ext/wasm/api/sqlite3-vfs-opfs.c-pp.js

@@ -803,7 +803,7 @@ const installOpfsVfs = function callee(options){
     const vfsSyncWrappers = {
       xAccess: function(pVfs,zName,flags,pOut){
         mTimeStart('xAccess');
-        const rc = opRun('xAccess', wasm.cstringToJs(zName));
+        const rc = opRun('xAccess', wasm.cstrToJs(zName));
         wasm.setMemValue( pOut, (rc ? 0 : 1), 'i32' );
         mTimeEnd();
         return 0;
@@ -823,7 +823,7 @@ const installOpfsVfs = function callee(options){
       },
       xDelete: function(pVfs, zName, doSyncDir){
         mTimeStart('xDelete');
-        opRun('xDelete', wasm.cstringToJs(zName), doSyncDir, false);
+        opRun('xDelete', wasm.cstrToJs(zName), doSyncDir, false);
         /* We're ignoring errors because we cannot yet differentiate
            between harmless and non-harmless failures. */
         mTimeEnd();
@@ -855,7 +855,7 @@ const installOpfsVfs = function callee(options){
                C-string here. */
             opfsFlags |= state.opfsFlags.OPFS_UNLOCK_ASAP;
           }
-          zName = wasm.cstringToJs(zName);
+          zName = wasm.cstrToJs(zName);
         }
         const fh = Object.create(null);
         fh.fid = pFile;
@@ -1156,11 +1156,8 @@ const installOpfsVfs = function callee(options){
         opt.vfs = opfsVfs.$zName;
         sqlite3.oo1.DB.dbCtorHelper.call(this, opt);
       };
-      sqlite3.oo1.OpfsDb =
-        opfsUtil.OpfsDb /* sqlite3.opfs.OpfsDb => deprecated name -
-                           will be phased out Real Soon */ =
-        OpfsDb;
       OpfsDb.prototype = Object.create(sqlite3.oo1.DB.prototype);
+      sqlite3.oo1.OpfsDb = OpfsDb;
       sqlite3.oo1.DB.dbCtorHelper.setVfsPostOpenSql(
         opfsVfs.pointer,
         function(oo1Db, sqlite3){
@@ -1185,7 +1182,7 @@ const installOpfsVfs = function callee(options){
           ], 0, 0, 0);
         }
       );
-    }
+    }/*extend sqlite3.oo1*/
 
     const sanityCheck = function(){
       const scope = wasm.scopedAllocPush();
@@ -1231,7 +1228,7 @@ const installOpfsVfs = function callee(options){
         const readBuf = wasm.scopedAlloc(16);
         rc = ioSyncWrappers.xRead(sq3File.pointer, readBuf, 6, 2);
         wasm.setMemValue(readBuf+6,0);
-        let jRead = wasm.cstringToJs(readBuf);
+        let jRead = wasm.cstrToJs(readBuf);
         log("xRead() got:",jRead);
         if("sanity"!==jRead) toss("Unexpected xRead() value.");
         if(vfsSyncWrappers.xSleep){

ext/wasm/api/sqlite3-wasm.c

@@ -368,7 +368,7 @@ void sqlite3_wasm_test_struct(WasmTestStruct * s){
 */
 SQLITE_WASM_KEEP
 const char * sqlite3_wasm_enum_json(void){
-  static char aBuffer[1024 * 12] = {0} /* where the JSON goes */;
+  static char aBuffer[1024 * 16] = {0} /* where the JSON goes */;
   int n = 0, nChildren = 0, nStruct = 0
     /* output counters for figuring out where commas go */;
   char * zPos = &aBuffer[1] /* skip first byte for now to help protect
@@ -410,6 +410,12 @@ const char * sqlite3_wasm_enum_json(void){
     DefInt(SQLITE_ACCESS_READ)/*docs say this is unused*/;
   } _DefGroup;
 
+  /* TODO? Authorizer... */
+  DefGroup(authorizer){
+    DefInt(SQLITE_DENY);
+    DefInt(SQLITE_IGNORE);
+  } _DefGroup;
+
   DefGroup(blobFinalizers) {
     /* SQLITE_STATIC/TRANSIENT need to be handled explicitly as
     ** integers to avoid casting-related warnings. */
@@ -681,7 +687,36 @@ const char * sqlite3_wasm_enum_json(void){
     DefStr(SQLITE_VERSION);
     DefStr(SQLITE_SOURCE_ID);
   } _DefGroup;
-  
+
+  DefGroup(vtab) {
+    DefInt(SQLITE_INDEX_SCAN_UNIQUE);
+    DefInt(SQLITE_INDEX_CONSTRAINT_EQ);
+    DefInt(SQLITE_INDEX_CONSTRAINT_GT);
+    DefInt(SQLITE_INDEX_CONSTRAINT_LE);
+    DefInt(SQLITE_INDEX_CONSTRAINT_LT);
+    DefInt(SQLITE_INDEX_CONSTRAINT_GE);
+    DefInt(SQLITE_INDEX_CONSTRAINT_MATCH);
+    DefInt(SQLITE_INDEX_CONSTRAINT_LIKE);
+    DefInt(SQLITE_INDEX_CONSTRAINT_GLOB);
+    DefInt(SQLITE_INDEX_CONSTRAINT_REGEXP);
+    DefInt(SQLITE_INDEX_CONSTRAINT_NE);
+    DefInt(SQLITE_INDEX_CONSTRAINT_ISNOT);
+    DefInt(SQLITE_INDEX_CONSTRAINT_ISNOTNULL);
+    DefInt(SQLITE_INDEX_CONSTRAINT_ISNULL);
+    DefInt(SQLITE_INDEX_CONSTRAINT_IS);
+    DefInt(SQLITE_INDEX_CONSTRAINT_LIMIT);
+    DefInt(SQLITE_INDEX_CONSTRAINT_OFFSET);
+    DefInt(SQLITE_INDEX_CONSTRAINT_FUNCTION);
+    DefInt(SQLITE_VTAB_CONSTRAINT_SUPPORT);
+    DefInt(SQLITE_VTAB_INNOCUOUS);
+    DefInt(SQLITE_VTAB_DIRECTONLY);
+    DefInt(SQLITE_ROLLBACK);
+    //DefInt(SQLITE_IGNORE); // Also used by sqlite3_authorizer() callback
+    DefInt(SQLITE_FAIL);
+    //DefInt(SQLITE_ABORT); // Also an error code
+    DefInt(SQLITE_REPLACE);
+  } _DefGroup;
+
 #undef DefGroup
 #undef DefStr
 #undef DefInt
@@ -793,6 +828,128 @@ const char * sqlite3_wasm_enum_json(void){
     } _StructBinder;
 #undef CurrentStruct
 
+
+#define CurrentStruct sqlite3_vtab
+    StructBinder {
+      M(pModule, "p");
+      M(nRef,    "i");
+      M(zErrMsg, "p");
+    } _StructBinder;
+#undef CurrentStruct
+
+#define CurrentStruct sqlite3_vtab_cursor
+    StructBinder {
+      M(pVtab, "p");
+    } _StructBinder;
+#undef CurrentStruct
+
+#define CurrentStruct sqlite3_module
+    StructBinder {
+      M(iVersion,       "i");
+      M(xCreate,        "i(ppippp)");
+      M(xConnect,       "i(ppippp)");
+      M(xBestIndex,     "i(pp)");
+      M(xDisconnect,    "i(p)");
+      M(xDestroy,       "i(p)");
+      M(xOpen,          "i(pp)");
+      M(xClose,         "i(p)");
+      M(xFilter,        "i(pisip)");
+      M(xNext,          "i(p)");
+      M(xEof,           "i(p)");
+      M(xColumn,        "i(ppi)");
+      M(xRowid,         "i(pp)");
+      M(xUpdate,        "i(pipp)");
+      M(xBegin,         "i(p)");
+      M(xSync,          "i(p)");
+      M(xCommit,        "i(p)");
+      M(xRollback,      "i(p)");
+      M(xFindFunction,  "i(pispp)");
+      M(xRename,        "i(ps)");
+      // ^^^ v1. v2+ follows...
+      M(xSavepoint,     "i(pi)");
+      M(xRelease,       "i(pi)");
+      M(xRollbackTo,    "i(pi)");
+      // ^^^ v2. v3+ follows...
+      M(xShadowName,    "i(s)");
+    } _StructBinder;
+#undef CurrentStruct
+    
+    /**
+     ** Workaround: in order to map the various inner structs from
+     ** sqlite3_index_info, we have to uplift those into constructs we
+     ** can access by type name. These structs _must_ match their
+     ** in-sqlite3_index_info counterparts byte for byte.
+    */
+    typedef struct {
+      int iColumn;
+      unsigned char op;
+      unsigned char usable;
+      int iTermOffset;
+    } sqlite3_index_constraint;
+    typedef struct {
+      int iColumn;
+      unsigned char desc;
+    } sqlite3_index_orderby;
+    typedef struct {
+      int argvIndex;
+      unsigned char omit;
+    } sqlite3_index_constraint_usage;
+    { /* Validate that the above struct sizeof()s match
+      ** expectations. We could improve upon this by
+      ** checking the offsetof() for each member. */
+      const sqlite3_index_info siiCheck;
+#define IndexSzCheck(T,M)           \
+      (sizeof(T) == sizeof(*siiCheck.M))
+      if(!IndexSzCheck(sqlite3_index_constraint,aConstraint)
+         || !IndexSzCheck(sqlite3_index_orderby,aOrderBy)
+         || !IndexSzCheck(sqlite3_index_constraint_usage,aConstraintUsage)){
+        assert(!"sizeof mismatch in sqlite3_index_... struct(s)");
+        return 0;
+      }
+#undef IndexSzCheck
+    }
+
+#define CurrentStruct sqlite3_index_constraint
+    StructBinder {
+      M(iColumn,        "i");
+      M(op,             "C");
+      M(usable,         "C");
+      M(iTermOffset,    "i");
+    } _StructBinder;
+#undef CurrentStruct
+
+#define CurrentStruct sqlite3_index_orderby
+    StructBinder {
+      M(iColumn,   "i");
+      M(desc,      "C");
+    } _StructBinder;
+#undef CurrentStruct
+
+#define CurrentStruct sqlite3_index_constraint_usage
+    StructBinder {
+      M(argvIndex,  "i");
+      M(omit,       "C");
+    } _StructBinder;
+#undef CurrentStruct
+
+#define CurrentStruct sqlite3_index_info
+    StructBinder {
+      M(nConstraint,        "i");
+      M(aConstraint,        "p");
+      M(nOrderBy,           "i");
+      M(aOrderBy,           "p");
+      M(aConstraintUsage,   "p");
+      M(idxNum,             "i");
+      M(idxStr,             "p");
+      M(needToFreeIdxStr,   "i");
+      M(orderByConsumed,    "i");
+      M(estimatedCost,      "d");
+      M(estimatedRows,      "j");
+      M(idxFlags,           "i");
+      M(colUsed,            "j");
+    } _StructBinder;
+#undef CurrentStruct
+
 #if SQLITE_WASM_TESTS
 #define CurrentStruct WasmTestStruct
     StructBinder {
@@ -864,7 +1021,11 @@ sqlite3_vfs * sqlite3_wasm_db_vfs(sqlite3 *pDb, const char *zDbName){
 **
 ** This function resets the given db pointer's database as described at
 **
-** https://www.sqlite.org/c3ref/c_dbconfig_defensive.html#sqlitedbconfigresetdatabase
+** https://sqlite.org/c3ref/c_dbconfig_defensive.html#sqlitedbconfigresetdatabase
+**
+** But beware: virtual tables destroyed that way do not have their
+** xDestroy() called, so will leak if they require that function for
+** proper cleanup.
 **
 ** Returns 0 on success, an SQLITE_xxx code on error. Returns
 ** SQLITE_MISUSE if pDb is NULL.
@@ -873,6 +1034,7 @@ SQLITE_WASM_KEEP
 int sqlite3_wasm_db_reset(sqlite3 *pDb){
   int rc = SQLITE_MISUSE;
   if( pDb ){
+    sqlite3_table_column_metadata(pDb, "main", 0, 0, 0, 0, 0, 0, 0);
     rc = sqlite3_db_config(pDb, SQLITE_DBCONFIG_RESET_DATABASE, 1, 0);
     if( 0==rc ){
       rc = sqlite3_exec(pDb, "VACUUM", 0, 0, 0);
@@ -1109,6 +1271,31 @@ sqlite3_kvvfs_methods * sqlite3_wasm_kvvfs_methods(void){
   return &sqlite3KvvfsMethods;
 }
 
+/*
+** This function is NOT part of the sqlite3 public API. It is strictly
+** for use by the sqlite project's own JS/WASM bindings.
+**
+** This is a proxy for the variadic sqlite3_vtab_config() which passes
+** its argument on, or not, to sqlite3_vtab_config(), depending on the
+** value of its 2nd argument. Returns the result of
+** sqlite3_vtab_config(), or SQLITE_MISUSE if the 2nd arg is not a
+** valid value.
+*/
+SQLITE_WASM_KEEP
+int sqlite3_wasm_vtab_config(sqlite3 *pDb, int op, int arg){
+  switch(op){
+  case SQLITE_VTAB_DIRECTONLY:
+  case SQLITE_VTAB_INNOCUOUS:
+    return sqlite3_vtab_config(pDb, op);
+  case SQLITE_VTAB_CONSTRAINT_SUPPORT:
+    return sqlite3_vtab_config(pDb, op, arg);
+  default:
+    return SQLITE_MISUSE;
+  }
+
+}
+
+
 #if defined(__EMSCRIPTEN__) && defined(SQLITE_ENABLE_WASMFS)
 #include <emscripten/wasmfs.h>
 

ext/wasm/common/emscripten.css

@@ -1,4 +1,4 @@
-/* emcscript-related styling, used during the module load/intialization processes... */
+/* emscripten-related styling, used during the module load/intialization processes... */
 .emscripten { padding-right: 0; margin-left: auto; margin-right: auto; display: block; }
 div.emscripten { text-align: center; }
 div.emscripten_border { border: 1px solid black; }

ext/wasm/common/testing.css

@@ -61,3 +61,9 @@ span.labeled-input {
   flex-direction: column-reverse;
 }
 label[for] { cursor: pointer }
+
+h1 {
+  border-radius: 0.25em;
+  padding: 0.15em 0.25em;
+}
+h1:first-of-type {margin: 0 0 0.5em 0;}

ext/wasm/common/whwasmutil.js

@@ -725,11 +725,12 @@ self.WhWasmUtilInstaller = function(target){
      Expects ptr to be a pointer into the WASM heap memory which
      refers to a NUL-terminated C-style string encoded as UTF-8.
      Returns the length, in bytes, of the string, as for `strlen(3)`.
-     As a special case, if !ptr then it it returns `null`. Throws if
+     As a special case, if !ptr or if it's not a pointer then it
-     ptr is out of range for target.heap8u().
+     returns `null`. Throws if ptr is out of range for
+     target.heap8u().
   */
   target.cstrlen = function(ptr){
-    if(!ptr) return null;
+    if(!ptr || !target.isPtr(ptr)) return null;
     const h = heapWrappers().HEAP8U;
     let pos = ptr;
     for( ; h[pos] !== 0; ++pos ){}
@@ -753,9 +754,9 @@ self.WhWasmUtilInstaller = function(target){
      refers to a NUL-terminated C-style string encoded as UTF-8. This
      function counts its byte length using cstrlen() then returns a
      JS-format string representing its contents. As a special case, if
-     ptr is falsy, `null` is returned.
+     ptr is falsy or not a pointer, `null` is returned.
   */
-  target.cstringToJs = function(ptr){
+  target.cstrToJs = function(ptr){
     const n = target.cstrlen(ptr);
     return n ? __utf8Decode(heapWrappers().HEAP8U, ptr, ptr+n) : (null===n ? n : "");
   };
@@ -942,10 +943,19 @@ self.WhWasmUtilInstaller = function(target){
   const __allocCStr = function(jstr, returnWithLength, allocator, funcName){
     __affirmAlloc(target, funcName);
     if('string'!==typeof jstr) return null;
-    const n = target.jstrlen(jstr),
+    if(0){/* older impl, possibly more widely compatible? */
-          ptr = allocator(n+1);
+      const n = target.jstrlen(jstr),
-    target.jstrcpy(jstr, target.heap8u(), ptr, n+1, true);
+            ptr = allocator(n+1);
-    return returnWithLength ? [ptr, n] : ptr;
+      target.jstrcpy(jstr, target.heap8u(), ptr, n+1, true);
+      return returnWithLength ? [ptr, n] : ptr;
+    }else{/* newer, (probably) faster and (certainly) simpler impl */
+      const u = cache.utf8Encoder.encode(jstr),
+            ptr = allocator(u.length+1),
+            heap = heapWrappers().HEAP8U;
+      heap.set(u, ptr);
+      heap[ptr + u.length] = 0;
+      return returnWithLength ? [ptr, u.length] : ptr;
+    }
   };
 
   /**
@@ -1081,10 +1091,9 @@ self.WhWasmUtilInstaller = function(target){
 
   // impl for allocMainArgv() and scopedAllocMainArgv().
   const __allocMainArgv = function(isScoped, list){
-    if(!list.length) toss("Cannot allocate empty array.");
     const pList = target[
       isScoped ? 'scopedAlloc' : 'alloc'
-    ](list.length * target.ptrSizeof);
+    ]((list.length + 1) * target.ptrSizeof);
     let i = 0;
     list.forEach((e)=>{
       target.setPtrValue(pList + (target.ptrSizeof * i++),
@@ -1092,29 +1101,57 @@ self.WhWasmUtilInstaller = function(target){
                            isScoped ? 'scopedAllocCString' : 'allocCString'
                          ](""+e));
     });
+    target.setPtrValue(pList + (target.ptrSizeof * i), 0);
     return pList;
   };
 
   /**
      Creates an array, using scopedAlloc(), suitable for passing to a
      C-level main() routine. The input is a collection with a length
-     property and a forEach() method. A block of memory list.length
+     property and a forEach() method. A block of memory
-     entries long is allocated and each pointer-sized block of that
+     (list.length+1) entries long is allocated and each pointer-sized
-     memory is populated with a scopedAllocCString() conversion of the
+     block of that memory is populated with a scopedAllocCString()
-     (""+value) of each element. Returns a pointer to the start of the
+     conversion of the (""+value) of each element, with the exception
-     list, suitable for passing as the 2nd argument to a C-style
+     that the final entry is a NULL pointer. Returns a pointer to the
-     main() function.
+     start of the list, suitable for passing as the 2nd argument to a
+     C-style main() function.
 
-     Throws if list.length is falsy or scopedAllocPush() is not active.
+     Throws if scopedAllocPush() is not active.
+
+     Design note: the returned array is allocated with an extra NULL
+     pointer entry to accommodate certain APIs, but client code which
+     does not need that functionality should treat the returned array
+     as list.length entries long.
   */
   target.scopedAllocMainArgv = (list)=>__allocMainArgv(true, list);
 
   /**
      Identical to scopedAllocMainArgv() but uses alloc() instead of
-     scopedAllocMainArgv
+     scopedAlloc().
   */
   target.allocMainArgv = (list)=>__allocMainArgv(false, list);
 
+  /**
+     Expects to be given a C-style string array and its length. It
+     returns a JS array of strings and/or nulls: any entry in the
+     pArgv array which is NULL results in a null entry in the result
+     array. If argc is 0 then an empty array is returned.
+
+     Results are undefined if any entry in the first argc entries of
+     pArgv are neither 0 (NULL) nor legal UTF-format C strings.
+
+     To be clear, the expected C-style arguments to be passed to this
+     function are `(int, char **)` (optionally const-qualified).
+  */
+  target.cArgvToJs = (argc, pArgv)=>{
+    const list = [];
+    for(let i = 0; i < argc; ++i){
+      const arg = target.getPtrValue(pArgv + (target.ptrSizeof * i));
+      list.push( arg ? target.cstrToJs(arg) : null );
+    }
+    return list;
+  };
+
   /**
      Wraps function call func() in a scopedAllocPush() and
      scopedAllocPop() block, such that all calls to scopedAlloc() and
@@ -1278,14 +1315,14 @@ self.WhWasmUtilInstaller = function(target){
       if('string'===typeof v) return target.scopedAllocCString(v);
       return v ? xcv.arg[ptrIR](v) : null;
     };
-  xcv.result.string = xcv.result.utf8 = (i)=>target.cstringToJs(i);
+  xcv.result.string = xcv.result.utf8 = (i)=>target.cstrToJs(i);
   xcv.result['string:dealloc'] = xcv.result['utf8:dealloc'] = (i)=>{
-    try { return i ? target.cstringToJs(i) : null }
+    try { return i ? target.cstrToJs(i) : null }
     finally{ target.dealloc(i) }
   };
-  xcv.result.json = (i)=>JSON.parse(target.cstringToJs(i));
+  xcv.result.json = (i)=>JSON.parse(target.cstrToJs(i));
   xcv.result['json:dealloc'] = (i)=>{
-    try{ return i ? JSON.parse(target.cstringToJs(i)) : null }
+    try{ return i ? JSON.parse(target.cstrToJs(i)) : null }
     finally{ target.dealloc(i) }
   }
   xcv.result['void'] = (v)=>undefined;
@@ -1423,7 +1460,7 @@ self.WhWasmUtilInstaller = function(target){
 
 ```js
    target.xWrap.resultAdapter('string:my_free',(i)=>{
-      try { return i ? target.cstringToJs(i) : null }
+      try { return i ? target.cstrToJs(i) : null }
       finally{ target.exports.my_free(i) }
    };
 ```

ext/wasm/jaccwabyt/jaccwabyt.js

@@ -10,9 +10,12 @@
 
   ***********************************************************************
 
-  The Jaccwabyt API is documented in detail in an external file.
+  The Jaccwabyt API is documented in detail in an external file,
+  _possibly_ called jaccwabyt.md in the same directory as this file.
 
-  Project home: https://fossil.wanderinghorse.net/r/jaccwabyt
+  Project homes:
+  - https://fossil.wanderinghorse.net/r/jaccwabyt
+  - https://sqlite.org/src/dir/ext/wasm/jaccwabyt
 
 */
 'use strict';
@@ -61,7 +64,6 @@ self.Jaccwabyt = function StructBinderFactory(config){
         BigInt = self['BigInt'],
         BigInt64Array = self['BigInt64Array'],
         /* Undocumented (on purpose) config options: */
-        functionTable = config.functionTable/*EXPERIMENTAL, undocumented*/,
         ptrSizeof = config.ptrSizeof || 4,
         ptrIR = config.ptrIR || 'i32'
   ;
@@ -121,6 +123,7 @@ self.Jaccwabyt = function StructBinderFactory(config){
       at SIG s[0]. Throws for an unknown SIG. */
   const sigIR = function(s){
     switch(sigLetter(s)){
+        case 'c': case 'C': return 'i8';
         case 'i': return 'i32';
         case 'p': case 'P': case 's': return ptrIR;
         case 'j': return 'i64';
@@ -129,33 +132,9 @@ self.Jaccwabyt = function StructBinderFactory(config){
     }
     toss("Unhandled signature IR:",s);
   };
-  /** Returns the sizeof value for the given SIG. Throws for an
+
-      unknown SIG. */
-  const sigSizeof = function(s){
-    switch(sigLetter(s)){
-        case 'i': return 4;
-        case 'p': case 'P': case 's': return ptrSizeof;
-        case 'j': return 8;
-        case 'f': return 4 /* C-side floats, not JS-side */;
-        case 'd': return 8;
-    }
-    toss("Unhandled signature sizeof:",s);
-  };
   const affirmBigIntArray = BigInt64Array
         ? ()=>true : ()=>toss('BigInt64Array is not available.');
-  /** Returns the (signed) TypedArray associated with the type
-      described by the given SIG. Throws for an unknown SIG. */
-  /**********
-  const sigTypedArray = function(s){
-    switch(sigIR(s)) {
-        case 'i32': return Int32Array;
-        case 'i64': return affirmBigIntArray() && BigInt64Array;
-        case 'float': return Float32Array;
-        case 'double': return Float64Array;
-    }
-    toss("Unhandled signature TypedArray:",s);
-  };
-  **************/
   /** Returns the name of a DataView getter method corresponding
       to the given SIG. */
   const sigDVGetter = function(s){
@@ -168,6 +147,8 @@ self.Jaccwabyt = function StructBinderFactory(config){
           break;
         }
         case 'i': return 'getInt32';
+        case 'c': return 'getInt8';
+        case 'C': return 'getUint8';
         case 'j': return affirmBigIntArray() && 'getBigInt64';
         case 'f': return 'getFloat32';
         case 'd': return 'getFloat64';
@@ -186,6 +167,8 @@ self.Jaccwabyt = function StructBinderFactory(config){
           break;
         }
         case 'i': return 'setInt32';
+        case 'c': return 'setInt8';
+        case 'C': return 'setUint8';
         case 'j': return affirmBigIntArray() && 'setBigInt64';
         case 'f': return 'setFloat32';
         case 'd': return 'setFloat64';
@@ -199,7 +182,7 @@ self.Jaccwabyt = function StructBinderFactory(config){
   */
   const sigDVSetWrapper = function(s){
     switch(sigLetter(s)) {
-        case 'i': case 'f': case 'd': return Number;
+        case 'i': case 'f': case 'c': case 'C': case 'd': return Number;
         case 'j': return affirmBigIntArray() && BigInt;
         case 'p': case 'P': case 's':
           switch(ptrSizeof){
@@ -211,36 +194,14 @@ self.Jaccwabyt = function StructBinderFactory(config){
     toss("Unhandled DataView set wrapper for signature:",s);
   };
 
+  /** Returns the given struct and member name in a form suitable for
+      debugging and error output. */
   const sPropName = (s,k)=>s+'::'+k;
 
   const __propThrowOnSet = function(structName,propName){
     return ()=>toss(sPropName(structName,propName),"is read-only.");
   };
 
-  /**
-     When C code passes a pointer of a bound struct to back into
-     a JS function via a function pointer struct member, it
-     arrives in JS as a number (pointer).
-     StructType.instanceForPointer(ptr) can be used to get the
-     instance associated with that pointer, and __ptrBacklinks
-     holds that mapping. WeakMap keys must be objects, so we
-     cannot use a weak map to map pointers to instances. We use
-     the StructType constructor as the WeakMap key, mapped to a
-     plain, prototype-less Object which maps the pointers to
-     struct instances. That arrangement gives us a
-     per-StructType type-safe way to resolve pointers.
-  */
-  const __ptrBacklinks = new WeakMap();
-  /**
-     Similar to __ptrBacklinks but is scoped at the StructBinder
-     level and holds pointer-to-object mappings for all struct
-     instances created by any struct from any StructFactory
-     which this specific StructBinder has created. The intention
-     of this is to help implement more transparent handling of
-     pointer-type property resolution.
-  */
-  const __ptrBacklinksGlobal = Object.create(null);
-
   /**
      In order to completely hide StructBinder-bound struct
      pointers from JS code, we store them in a scope-local
@@ -261,17 +222,13 @@ self.Jaccwabyt = function StructBinderFactory(config){
   const __freeStruct = function(ctor, obj, m){
     if(!m) m = __instancePointerMap.get(obj);
     if(m) {
-      if(obj.ondispose instanceof Function){
+      __instancePointerMap.delete(obj);
-        try{obj.ondispose()}
+      if(Array.isArray(obj.ondispose)){
-        catch(e){
+        let x;
-          /*do not rethrow: destructors must not throw*/
+        while((x = obj.ondispose.shift())){
-          console.warn("ondispose() for",ctor.structName,'@',
-                       m,'threw. NOT propagating it.',e);
-        }
-      }else if(Array.isArray(obj.ondispose)){
-        obj.ondispose.forEach(function(x){
           try{
             if(x instanceof Function) x.call(obj);
+            else if(x instanceof StructType) x.dispose();
             else if('number' === typeof x) dealloc(x);
             // else ignore. Strings are permitted to annotate entries
             // to assist in debugging.
@@ -279,12 +236,16 @@ self.Jaccwabyt = function StructBinderFactory(config){
             console.warn("ondispose() for",ctor.structName,'@',
                          m,'threw. NOT propagating it.',e);
           }
-        });
+        }
+      }else if(obj.ondispose instanceof Function){
+        try{obj.ondispose()}
+        catch(e){
+          /*do not rethrow: destructors must not throw*/
+          console.warn("ondispose() for",ctor.structName,'@',
+                       m,'threw. NOT propagating it.',e);
+        }
       }
       delete obj.ondispose;
-      delete __ptrBacklinks.get(ctor)[m];
-      delete __ptrBacklinksGlobal[m];
-      __instancePointerMap.delete(obj);
       if(ctor.debugFlags.__flags.dealloc){
         log("debug.dealloc:",(obj[xPtrPropName]?"EXTERNAL":""),
             ctor.structName,"instance:",
@@ -300,7 +261,7 @@ self.Jaccwabyt = function StructBinderFactory(config){
                             iterable: false, value: v}};
 
   /** Allocates obj's memory buffer based on the size defined in
-      DEF.sizeof. */
+      ctor.structInfo.sizeof. */
   const __allocStruct = function(ctor, obj, m){
     let fill = !m;
     if(m) Object.defineProperty(obj, xPtrPropName, rop(m));
@@ -316,8 +277,6 @@ self.Jaccwabyt = function StructBinderFactory(config){
       }
       if(fill) heap().fill(0, m, m + ctor.structInfo.sizeof);
       __instancePointerMap.set(obj, m);
-      __ptrBacklinks.get(ctor)[m] = obj;
-      __ptrBacklinksGlobal[m] = obj;
     }catch(e){
       __freeStruct(ctor, obj, m);
       throw e;
@@ -339,7 +298,7 @@ self.Jaccwabyt = function StructBinderFactory(config){
      if tossIfNotFound is true, else returns undefined if not
      found. The given name may be either the name of the
      structInfo.members key (faster) or the key as modified by the
-     memberPrefix/memberSuffix settings.
+     memberPrefix and memberSuffix settings.
   */
   const __lookupMember = function(structInfo, memberName, tossIfNotFound=true){
     let m = structInfo.members[memberName];
@@ -361,21 +320,11 @@ self.Jaccwabyt = function StructBinderFactory(config){
      framework's native format or in Emscripten format.
   */
   const __memberSignature = function f(obj,memberName,emscriptenFormat=false){
-    if(!f._) f._ = (x)=>x.replace(/[^vipPsjrd]/g,"").replace(/[pPs]/g,'i');
+    if(!f._) f._ = (x)=>x.replace(/[^vipPsjrdcC]/g,"").replace(/[pPscC]/g,'i');
     const m = __lookupMember(obj.structInfo, memberName, true);
     return emscriptenFormat ? f._(m.signature) : m.signature;
   };
 
-  /**
-     Returns the instanceForPointer() impl for the given
-     StructType constructor.
-  */
-  const __instanceBacklinkFactory = function(ctor){
-    const b = Object.create(null);
-    __ptrBacklinks.set(ctor, b);
-    return (ptr)=>b[ptr];
-  };
-
   const __ptrPropDescriptor = {
     configurable: false, enumerable: false,
     get: function(){return __instancePointerMap.get(this)},
@@ -388,7 +337,9 @@ self.Jaccwabyt = function StructBinderFactory(config){
   /** Impl of X.memberKeys() for StructType and struct ctors. */
   const __structMemberKeys = rop(function(){
     const a = [];
-    Object.keys(this.structInfo.members).forEach((k)=>a.push(this.memberKey(k)));
+    for(const k of Object.keys(this.structInfo.members)){
+      a.push(this.memberKey(k));
+    }
     return a;
   });
 
@@ -454,15 +405,15 @@ self.Jaccwabyt = function StructBinderFactory(config){
      Adds value v to obj.ondispose, creating ondispose,
      or converting it to an array, if needed.
   */
-  const __addOnDispose = function(obj, v){
+  const __addOnDispose = function(obj, ...v){
     if(obj.ondispose){
-      if(obj.ondispose instanceof Function){
+      if(!Array.isArray(obj.ondispose)){
         obj.ondispose = [obj.ondispose];
-      }/*else assume it's an array*/
+      }
     }else{
       obj.ondispose = [];
     }
-    obj.ondispose.push(v);
+    obj.ondispose.push(...v);
   };
 
   /**
@@ -477,8 +428,9 @@ self.Jaccwabyt = function StructBinderFactory(config){
     const mem = alloc(u.length+1);
     if(!mem) toss("Allocation error while duplicating string:",str);
     const h = heap();
-    let i = 0;
+    //let i = 0;
-    for( ; i < u.length; ++i ) h[mem + i] = u[i];
+    //for( ; i < u.length; ++i ) h[mem + i] = u[i];
+    h.set(u, mem);
     h[mem + u.length] = 0;
     //log("allocCString @",mem," =",u);
     return mem;
@@ -490,6 +442,10 @@ self.Jaccwabyt = function StructBinderFactory(config){
      to free any prior memory, if appropriate. The newly-allocated
      string is added to obj.ondispose so will be freed when the object
      is disposed.
+
+     The given name may be either the name of the structInfo.members
+     key (faster) or the key as modified by the memberPrefix and
+     memberSuffix settings.
   */
   const __setMemberCString = function(obj, memberName, str){
     const m = __lookupMember(obj.structInfo, memberName, true);
@@ -544,13 +500,19 @@ self.Jaccwabyt = function StructBinderFactory(config){
       return __setMemberCString(this, memberName, str);
     })
   });
+  // Function-type non-Property inherited members 
+  Object.assign(StructType.prototype,{
+    addOnDispose: function(...v){
+      __addOnDispose(this,...v);
+      return this;
+    }
+  });
 
   /**
      "Static" properties for StructType.
   */
   Object.defineProperties(StructType, {
     allocCString: rop(__allocCString),
-    instanceForPointer: rop((ptr)=>__ptrBacklinksGlobal[ptr]),
     isA: rop((v)=>v instanceof StructType),
     hasExternalPointer: rop((v)=>(v instanceof StructType) && !!v[xPtrPropName]),
     memberKey: __memberKeyProp
@@ -570,7 +532,7 @@ self.Jaccwabyt = function StructBinderFactory(config){
       /*cache all available getters/setters/set-wrappers for
         direct reuse in each accessor function. */
       f._ = {getters: {}, setters: {}, sw:{}};
-      const a = ['i','p','P','s','f','d','v()'];
+      const a = ['i','c','C','p','P','s','f','d','v()'];
       if(bigIntEnabled) a.push('j');
       a.forEach(function(v){
         //const ir = sigIR(v);
@@ -579,8 +541,8 @@ self.Jaccwabyt = function StructBinderFactory(config){
         f._.sw[v] = sigDVSetWrapper(v)  /* BigInt or Number ctor to wrap around values
                                            for conversion */;
       });
-      const rxSig1 = /^[ipPsjfd]$/,
+      const rxSig1 = /^[ipPsjfdcC]$/,
-            rxSig2 = /^[vipPsjfd]\([ipPsjfd]*\)$/;
+            rxSig2 = /^[vipPsjfdcC]\([ipPsjfdcC]*\)$/;
       f.sigCheck = function(obj, name, key,sig){
         if(Object.prototype.hasOwnProperty.call(obj, key)){
           toss(obj.structName,'already has a property named',key+'.');
@@ -594,7 +556,6 @@ self.Jaccwabyt = function StructBinderFactory(config){
     f.sigCheck(ctor.prototype, name, key, descr.signature);
     descr.key = key;
     descr.name = name;
-    const sizeOf = sigSizeof(descr.signature);
     const sigGlyph = sigLetter(descr.signature);
     const xPropName = sPropName(ctor.prototype.structName,key);
     const dbg = ctor.prototype.debugFlags.__flags;
@@ -610,16 +571,12 @@ self.Jaccwabyt = function StructBinderFactory(config){
     prop.get = function(){
       if(dbg.getter){
         log("debug.getter:",f._.getters[sigGlyph],"for", sigIR(sigGlyph),
-            xPropName,'@', this.pointer,'+',descr.offset,'sz',sizeOf);
+            xPropName,'@', this.pointer,'+',descr.offset,'sz',descr.sizeof);
       }
       let rc = (
-        new DataView(heap().buffer, this.pointer + descr.offset, sizeOf)
+        new DataView(heap().buffer, this.pointer + descr.offset, descr.sizeof)
       )[f._.getters[sigGlyph]](0, isLittleEndian);
       if(dbg.getter) log("debug.getter:",xPropName,"result =",rc);
-      if(rc && isAutoPtrSig(descr.signature)){
-        rc = StructType.instanceForPointer(rc) || rc;
-        if(dbg.getter) log("debug.getter:",xPropName,"resolved =",rc);
-      }                
       return rc;
     };
     if(descr.readOnly){
@@ -628,7 +585,7 @@ self.Jaccwabyt = function StructBinderFactory(config){
       prop.set = function(v){
         if(dbg.setter){
           log("debug.setter:",f._.setters[sigGlyph],"for", sigIR(sigGlyph),
-              xPropName,'@', this.pointer,'+',descr.offset,'sz',sizeOf, v);
+              xPropName,'@', this.pointer,'+',descr.offset,'sz',descr.sizeof, v);
         }
         if(!this.pointer){
           toss("Cannot set struct property on disposed instance.");
@@ -644,7 +601,7 @@ self.Jaccwabyt = function StructBinderFactory(config){
           toss("Invalid value for pointer-type",xPropName+'.');
         }
         (
-          new DataView(heap().buffer, this.pointer + descr.offset, sizeOf)
+          new DataView(heap().buffer, this.pointer + descr.offset, descr.sizeof)
         )[f._.setters[sigGlyph]](0, f._.sw[sigGlyph](v), isLittleEndian);
       };
     }
@@ -665,13 +622,25 @@ self.Jaccwabyt = function StructBinderFactory(config){
     if(!structName) toss("Struct name is required.");
     let lastMember = false;
     Object.keys(structInfo.members).forEach((k)=>{
+      // Sanity checks of sizeof/offset info...
       const m = structInfo.members[k];
       if(!m.sizeof) toss(structName,"member",k,"is missing sizeof.");
-      else if(0!==(m.sizeof%4)){
+      else if(m.sizeof===1){
-        toss(structName,"member",k,"sizeof is not aligned.");
+        (m.signature === 'c' || m.signature === 'C') ||
-      }
+          toss("Unexpected sizeof==1 member",
-      else if(0!==(m.offset%4)){
+               sPropName(structInfo.name,k),
-        toss(structName,"member",k,"offset is not aligned.");
+               "with signature",m.signature);
+      }else{
+        // sizes and offsets of size-1 members may be odd values, but
+        // others may not.
+        if(0!==(m.sizeof%4)){
+          console.warn("Invalid struct member description =",m,"from",structInfo);
+          toss(structName,"member",k,"sizeof is not aligned. sizeof="+m.sizeof);
+        }
+        if(0!==(m.offset%4)){
+          console.warn("Invalid struct member description =",m,"from",structInfo);
+          toss(structName,"member",k,"offset is not aligned. offset="+m.offset);
+        }
       }
       if(!lastMember || lastMember.offset < m.offset) lastMember = m;
     });
@@ -697,27 +666,9 @@ self.Jaccwabyt = function StructBinderFactory(config){
     };
     Object.defineProperties(StructCtor,{
       debugFlags: debugFlags,
-      disposeAll: rop(function(){
-        const map = __ptrBacklinks.get(StructCtor);
-        Object.keys(map).forEach(function(ptr){
-          const b = map[ptr];
-          if(b) __freeStruct(StructCtor, b, ptr);
-        });
-        __ptrBacklinks.set(StructCtor, Object.create(null));
-        return StructCtor;
-      }),
-      instanceForPointer: rop(__instanceBacklinkFactory(StructCtor)),
       isA: rop((v)=>v instanceof StructCtor),
       memberKey: __memberKeyProp,
       memberKeys: __structMemberKeys,
-      resolveToInstance: rop(function(v, throwIfNot=false){
-        if(!(v instanceof StructCtor)){
-          v = Number.isSafeInteger(v)
-            ? StructCtor.instanceForPointer(v) : undefined;
-        }
-        if(!v && throwIfNot) toss("Value is-not-a",StructCtor.structName);
-        return v;
-      }),
       methodInfoForKey: rop(function(mKey){
       }),
       structInfo: rop(structInfo),
@@ -735,7 +686,6 @@ self.Jaccwabyt = function StructBinderFactory(config){
     );
     return StructCtor;
   };
-  StructBinder.instanceForPointer = StructType.instanceForPointer;
   StructBinder.StructType = StructType;
   StructBinder.config = config;
   StructBinder.allocCString = __allocCString;

ext/wasm/jaccwabyt/jaccwabyt.md

@@ -4,7 +4,6 @@ Jaccwabyt 🐇
 **Jaccwabyt**: _JavaScript ⇄ C Struct Communication via WASM Byte
 Arrays_
 
-
 Welcome to Jaccwabyt, a JavaScript API which creates bindings for
 WASM-compiled C structs, defining them in such a way that changes to
 their state in JS are visible in C/WASM, and vice versa, permitting
@@ -27,8 +26,28 @@ are based solely on feature compatibility tables provided at
 **Formalities:**
 
 - Author: [Stephan Beal][sgb]
-- License: Public Domain
+- Project Homes:
-- Project Home: <https://fossil.wanderinghorse.net/r/jaccwabyt>
+  - <https://fossil.wanderinghorse.net/r/jaccwabyt>\  
+    Is the primary home but...
+  - <https://sqlite.org/src/dir/ext/wasm/jaccwabyt>\  
+    ... most development happens here.
+
+The license for both this documentation and the software it documents
+is the same as [sqlite3][], the project from which this spinoff
+project was spawned:
+
+-----
+
+> 2022-06-30:
+>
+> The author disclaims copyright to this source code.  In place of a
+> legal notice, here is a blessing:
+>
+>    May you do good and not evil.
+>    May you find forgiveness for yourself and forgive others.
+>    May you share freely, never taking more than you give.
+
+-----
 
 <a name='overview'></a>
 Table of Contents
@@ -205,7 +224,6 @@ simply look like:
 The StructBinder factory function returns a function which can then be
 used to create bindings for our structs.
 
-
 <a name='step-2'></a>
 Step 2: Create a Struct Description
 ------------------------------------------------------------
@@ -281,21 +299,29 @@ supported letters are:
   signature entry.
 - **`f`** = `float` (4 bytes)
 - **`d`** = `double` (8 bytes)
-- **`p`** = `int32` (but see below!)
+- **`c`** = `int8` (1 byte) char - see notes below!
+- **`C`** = `uint8` (1 byte) unsigned char - see notes below!
+- **`p`** = `int32` (see notes below!)
 - **`P`** = Like `p` but with extra handling. Described below.
-- **`s`** = like `int32` but is a _hint_ that it's a pointer to a string
+- **`s`** = like `int32` but is a _hint_ that it's a pointer to a
-  so that _some_ (very limited) contexts may treat it as such, noting
+  string so that _some_ (very limited) contexts may treat it as such,
-  such algorithms must, for lack of information to the contrary,
+  noting that such algorithms must, for lack of information to the
-  assume both that the encoding is UTF-8 and that the pointer's member
+  contrary, assume both that the encoding is UTF-8 and that the
-  is NUL-terminated. If that is _not_ the case for a given string
+  pointer's member is NUL-terminated. If that is _not_ the case for a
-  member, do not use `s`: use `i` or `p` instead and do any string
+  given string member, do not use `s`: use `i` or `p` instead and do
-  handling yourself.
+  any string handling yourself.
 
 Noting that:
 
-- All of these types are numeric. Attempting to set any struct-bound
+- **All of these types are numeric**. Attempting to set any
-  property to a non-numeric value will trigger an exception except in
+  struct-bound property to a non-numeric value will trigger an
-  cases explicitly noted otherwise.
+  exception except in cases explicitly noted otherwise.
+- **"Char" types**: WASM does not define an `int8` type, nor does it
+  distinguish between signed and unsigned. This API treats `c` as
+  `int8` and `C` as `uint8` for purposes of getting and setting values
+  when using the `DataView` class. It is _not_ recommended that client
+  code use these types in new WASM-capable code, but they were added
+  for the sake of binding some immutable legacy code to WASM.
 
 > Sidebar: Emscripten's public docs do not mention `p`, but their
 generated code includes `p` as an alias for `i`, presumably to mean
@@ -317,12 +343,12 @@ Signatures in the form `x(...)` denote function-pointer members and
 form `x()`. For function-type signatures, the strings are formulated
 such that they can be passed to Emscripten's `addFunction()` after
 stripping out the `(` and `)` characters. For good measure, to match
-the public Emscripten docs, `p` should also be replaced with `i`. In
+the public Emscripten docs, `p`, `c`, and `C`, should also be replaced
-JavaScript that might look like:
+with `i`. In JavaScript that might look like:
 
 >  
 ```
-signature.replace(/[^vipPsjfd]/g,'').replace(/[pPs]/g,'i');
+signature.replace(/[^vipPsjfdcC]/g,'').replace(/[pPscC]/g,'i');
 ```
 
 <a name='step-2-pvsp'></a>
@@ -337,12 +363,6 @@ special use of unsigned numbers). A capital `P` changes the semantics
 of plain member pointers (but not, as of this writing, function
 pointer members) as follows:
 
-- When a `P`-type member is **fetched** via `myStruct.x` and its value is
-  a non-0 integer, [`StructBinder.instanceForPointer()`][StructBinder]
-  is used to try to map that pointer to a struct instance. If a match
-  is found, the "get" operation returns that instance instead of the
-  integer. If no match is found, it behaves exactly as for `p`, returning
-  the integer value.
 - When a `P`-type member is **set** via `myStruct.x=y`, if
   [`(y instanceof StructType)`][StructType] then the value of `y.pointer` is
   stored in `myStruct.x`. If `y` is neither a number nor
@@ -388,14 +408,11 @@ It is important to understand that creating a new instance allocates
 memory on the WASM heap. We must not simply rely on garbage collection
 to clean up the instances because doing so will not free up the WASM
 heap memory. The correct way to free up that memory is to use the
-object's `dispose()` method. Alternately, there is a "nuclear option":
+object's `dispose()` method.
-`MyBinder.disposeAll()` will free the memory allocated for _all_
-instances which have not been manually disposed.
 
 The following usage pattern offers one way to easily ensure proper
 cleanup of struct instances:
 
-
 >  
 ```javascript
 const my = new MyStruct();
@@ -409,11 +426,6 @@ try {
      from the byte array. */
   // Pass the struct to C code which takes a MyStruct pointer:
   aCFunction( my.pointer );
-  // Type-safely check if a pointer returned from C is a MyStruct:
-  const x = MyStruct.instanceForPointer( anotherCFunction() );
-  // If it is a MyStruct, x now refers to that object. Note, however,
-  // that this only works for instances created in JS, as the
-  // pointer mapping only exists in JS space.
 } finally {
   my.dispose();
 }
@@ -426,6 +438,16 @@ to use `try`/`finally` without a `catch`, and doing so is an ideal
 match for the memory management requirements of Jaccwaby-bound struct
 instances.
 
+It is often useful to wrap an existing instance of a C-side struct
+without taking over ownership of its memory. That can be achieved by
+simply passing a pointer to the constructor. For example:
+
+```js
+const m = new MyStruct( functionReturningASharedPtr() );
+// calling m.dispose() will _not_ free the wrapped C-side instance
+// but will trigger any ondispose handler.
+```
+
 Now that we have struct instances, there are a number of things we
 can do with them, as covered in the rest of this document.
 
@@ -549,20 +571,6 @@ The Struct Binder has the following members:
   any of its "significant" configuration values may have undefined
   results.
 
-- `instanceForPointer(pointer)`  
-  Given a pointer value relative to `config.memory`, if that pointer
-  resolves to a struct of _any type_ generated via the same Struct
-  Binder, this returns the struct instance associated with it, or
-  `undefined` if no struct object is mapped to that pointer. This
-  differs from the struct-type-specific member of the same name in
-  that this one is not "type-safe": it does not know the type of the
-  returned object (if any) and may return a struct of any
-  [StructType][] for which this Struct Binder has created a
-  constructor. It cannot return instances created via a different
-  [StructBinderFactory][] because each factory can hypothetically have
-  a different memory heap.
-
-
 <a name='api-structtype'></a>
 API: Struct Type
 ------------------------------------------------------------
@@ -582,6 +590,14 @@ only called by the [StructBinder][]-generated
 has the following "static" properties (^Which are accessible from
 individual instances via `theInstance.constructor`.):
 
+- `addOnDispose(...value)`\  
+  If this object has no `ondispose` property, this function creates it
+  as an array and pushes the given value(s) onto it. If the object has
+  a function-typed `ondispose` property, this call replaces it with an
+  array and moves that function into the array. In all other cases,
+  `ondispose` is assumed to be an array and the argument(s) is/are
+  appended to it. Returns `this`.
+
 - `allocCString(str)`  
   Identical to the [StructBinder][] method of the same name.
 
@@ -591,9 +607,6 @@ individual instances via `theInstance.constructor`.):
   [struct's constructor][StructCtors]. If true, the memory is owned by
   someone other than the object and must outlive the object.
 
-- `instanceForPointer(pointer)`  
-  Works identically to the [StructBinder][] method of the same name.
-
 - `isA(value)`  
   Returns true if its argument is a StructType instance _from the same
   [StructBinder][]_ as this StructType.
@@ -619,14 +632,15 @@ legally be called on concrete struct instances unless noted otherwise:
   - If it is a function, it is called with the struct object as its `this`.
   That method must not throw - if it does, the exception will be
   ignored.
-  - If it is an array, it may contain functions, pointers, and/or JS
+  - If it is an array, it may contain functions, pointers, other
-    strings. If an entry is a function, it is called as described
+    [StructType] instances, and/or JS strings. If an entry is a
-    above. If it's a number, it's assumed to be a pointer and is
+    function, it is called as described above. If it's a number, it's
-    passed to the `dealloc()` function configured for the parent
+    assumed to be a pointer and is passed to the `dealloc()` function
-    [StructBinder][].  If it's a JS string, it's assumed to be a
+    configured for the parent [StructBinder][]. If it's a
-    helpful description of the next entry in the list and is simply
+    [StructType][] instance then its `dispose()` method is called. If
-    ignored. Strings are supported primarily for use as debugging
+    it's a JS string, it's assumed to be a helpful description of the
-    information.
+    next entry in the list and is simply ignored. Strings are
+    supported primarily for use as debugging information.
   - Some struct APIs will manipulate the `ondispose` member, creating
     it as an array or converting it from a function to array as
     needed.
@@ -738,21 +752,6 @@ pointer can be taken over using something like
 
 These constructors have the following "static" members:
 
-- `disposeAll()`  
-  For each instance of this struct, the equivalent of its `dispose()`
-  method is called. This frees all WASM-allocated memory associated
-  with _all_ instances and clears the `instanceForPointer()`
-  mappings. Returns `this`.
-
-- `instanceForPointer(pointer)`  
-  Given a pointer value (accessible via the `pointer` property of all
-  struct instances) which ostensibly refers to an instance of this
-  class, this returns the instance associated with it, or `undefined`
-  if no object _of this specific struct type_ is mapped to that
-  pointer. When C-side code calls back into JS code and passes a
-  pointer to an object, this function can be used to type-safely
-  "cast" that pointer back to its original object.
-
 - `isA(value)`  
   Returns true if its argument was created by this constructor.
 
@@ -762,15 +761,6 @@ These constructors have the following "static" members:
 - `memberKeys(string)`  
   Works exactly as documented for [StructType][].
 
-- `resolveToInstance(value [,throwIfNot=false])`  
-  Works like `instanceForPointer()` but accepts either an instance
-  of this struct type or a pointer which resolves to one.
-  It returns an instance of this struct type on success.
-  By default it returns a falsy value if its argument is not,
-  or does not resolve to, an instance of this struct type,
-  but if passed a truthy second argument then it will throw
-  instead.
-
 - `structInfo`  
   The structure description passed to [StructBinder][] when this
   constructor was generated.

ext/wasm/speedtest1-worker.html

@@ -75,7 +75,7 @@
         </li>
         <li>The easiest way to try different optimization levels is,
           from this directory:
-          <pre>$ rm -f speedtest1.js; make -e emcc_opt='-O2' speedtest1.js</pre>
+          <pre>$ rm -f jswasm/speedtest1.js; make -e emcc_opt='-O2' speedtest1</pre>
           Then reload this page. -O2 seems to consistently produce the fastest results.
         </li>
         </ul>

ext/wasm/speedtest1.html

@@ -40,9 +40,9 @@
     <script src="jswasm/speedtest1.js"></script>
     <script>(function(){
     /**
-       If this environment contains OPFS, this function initializes it and
+       If this environment contains WASMFS with OPFS, this function
-       returns the name of the dir on which OPFS is mounted, else it returns
+       initializes it and returns the name of the dir on which OPFS is
-       an empty string.
+       mounted, else it returns an empty string.
     */
     const wasmfsDir = function f(wasmUtil){
         if(undefined !== f._) return f._;

ext/wasm/tester1-worker.html

@@ -7,11 +7,7 @@
     <link rel="stylesheet" href="../common/emscripten.css"/>
     <link rel="stylesheet" href="../common/testing.css"/>
     <title>sqlite3 tester #1: Worker thread</title>
-    <style>
+    <style></style>
-      body {
-          font-family: monospace;
-      }
-    </style>
   </head>
   <body>
     <h1 id='color-target'>sqlite3 tester #1: Worker thread</h1>

ext/wasm/tester1.c-pp.html

@@ -13,14 +13,9 @@ ES6 Module in UI thread
 UI thread
 //#endif
     </title>
-    <style>
+    <style></style>
-      body {
-          font-family: monospace;
-      }
-    </style>
   </head>
-  <body>
+  <body><h1 id='color-target'></h1>
-    <h1 id='color-target'></h1>
     <div>See <a href='tester1-worker.html' target='tester1-worker.html'>tester1-worker.html</a>
       for the Worker-thread variant.</div>
     <div class='input-wrapper'>

ext/wasm/tester1.c-pp.js

@@ -22,12 +22,14 @@
   groups and individual tests can be assigned a predicate function
   which determines whether to run them or not, and this is
   specifically intended to be used to toggle certain tests on or off
-  for the main/worker threads.
+  for the main/worker threads or the availability (or not) of
+  optional features such as int64 support.
 
-  Each test group defines a state object which gets applied as each
+  Each test group defines a single state object which gets applied as
-  test function's `this`. Test functions can use that to, e.g., set up
+  the test functions' `this` for all tests in that group. Test
-  a db in an early test and close it in a later test. Each test gets
+  functions can use that to, e.g., set up a db in an early test and
-  passed the sqlite3 namespace object as its only argument.
+  close it in a later test. Each test gets passed the sqlite3
+  namespace object as its only argument.
 */
 /*
    This file is intended to be processed by c-pp to inject (or not)
@@ -301,14 +303,12 @@ self.sqlite3InitModule = sqlite3InitModule;
     addTest: function(name, callback){
       let predicate;
       if(1===arguments.length){
-        const opt = arguments[0];
+        this.currentTestGroup.addTest(arguments[0]);
-        predicate = opt.predicate;
+      }else{
-        name = opt.name;
+        this.currentTestGroup.addTest({
-        callback = opt.test;
+          name, predicate, test: callback
+        });
       }
-      this.currentTestGroup.addTest({
-        name, predicate, test: callback
-      });
       return this;
     },
     runTests: async function(sqlite3){
@@ -399,12 +399,21 @@ self.sqlite3InitModule = sqlite3InitModule;
       catch(e){T.assert("test ing ." === e.message)}
 
       try{ throw new sqlite3.SQLite3Error(capi.SQLITE_SCHEMA) }
-      catch(e){ T.assert('SQLITE_SCHEMA' === e.message) }
+      catch(e){
+        T.assert('SQLITE_SCHEMA' === e.message)
+          .assert(capi.SQLITE_SCHEMA === e.resultCode);
+      }
       try{ sqlite3.SQLite3Error.toss(capi.SQLITE_CORRUPT,{cause: true}) }
       catch(e){
-        T.assert('SQLITE_CORRUPT'===e.message)
+        T.assert('SQLITE_CORRUPT' === e.message)
+          .assert(capi.SQLITE_CORRUPT === e.resultCode)
           .assert(true===e.cause);
       }
+      try{ sqlite3.SQLite3Error.toss("resultCode check") }
+      catch(e){
+        T.assert(capi.SQLITE_ERROR === e.resultCode)
+          .assert('resultCode check' === e.message);        
+      }
     })
   ////////////////////////////////////////////////////////////////////
     .t('strglob/strlike', function(sqlite3){
@@ -419,6 +428,7 @@ self.sqlite3InitModule = sqlite3InitModule;
   ////////////////////////////////////////////////////////////////////
   T.g('C/WASM Utilities')
     .t('sqlite3.wasm namespace', function(sqlite3){
+      // TODO: break this into smaller individual test functions.
       const w = wasm;
       const chr = (x)=>x.charCodeAt(0);
       //log("heap getters...");
@@ -546,13 +556,13 @@ self.sqlite3InitModule = sqlite3InitModule;
           let cpy = w.scopedAlloc(n+10);
           let rc = w.cstrncpy(cpy, cStr, n+10);
           T.assert(n+1 === rc).
-            assert("hello" === w.cstringToJs(cpy)).
+            assert("hello" === w.cstrToJs(cpy)).
             assert(chr('o') === w.getMemValue(cpy+n-1)).
             assert(0 === w.getMemValue(cpy+n));
           let cStr2 = w.scopedAllocCString("HI!!!");
           rc = w.cstrncpy(cpy, cStr2, 3);
           T.assert(3===rc).
-            assert("HI!lo" === w.cstringToJs(cpy)).
+            assert("HI!lo" === w.cstrToJs(cpy)).
             assert(chr('!') === w.getMemValue(cpy+2)).
             assert(chr('l') === w.getMemValue(cpy+3));
         }finally{
@@ -660,6 +670,26 @@ self.sqlite3InitModule = sqlite3InitModule;
         T.assert(rc>0 && Number.isFinite(rc));
         rc = w.xCallWrapped('sqlite3_wasm_enum_json','utf8');
         T.assert('string'===typeof rc).assert(rc.length>300);
+
+
+        { // 'string:static' argAdapter() sanity checks...
+          let argAd = w.xWrap.argAdapter('string:static');
+          let p0 = argAd('foo'), p1 = argAd('bar');
+          T.assert(w.isPtr(p0) && w.isPtr(p1))
+            .assert(p0 !== p1)
+            .assert(p0 === argAd('foo'))
+            .assert(p1 === argAd('bar'));
+        }
+
+        // 'string:flexible' argAdapter() sanity checks...
+        w.scopedAllocCall(()=>{
+          const argAd = w.xWrap.argAdapter('string:flexible');
+          const cj = (v)=>w.cstrToJs(argAd(v));
+          T.assert('Hi' === cj('Hi'))
+            .assert('hi' === cj(['h','i']))
+            .assert('HI' === cj(new Uint8Array([72, 73])));
+        });
+
         if(haveWasmCTests()){
           if(!sqlite3.config.useStdAlloc){
             fw = w.xWrap('sqlite3_wasm_test_str_hello', 'utf8:dealloc',['i32']);
@@ -689,7 +719,7 @@ self.sqlite3InitModule = sqlite3InitModule;
     }/*WhWasmUtil*/)
 
   ////////////////////////////////////////////////////////////////////
-    .t('sqlite3.StructBinder (jaccwabyt)', function(sqlite3){
+    .t('sqlite3.StructBinder (jaccwabyt🐇)', function(sqlite3){
       const S = sqlite3, W = S.wasm;
       const MyStructDef = {
         sizeof: 16,
@@ -720,9 +750,6 @@ self.sqlite3InitModule = sqlite3InitModule;
           assert(undefined === K.prototype.lookupMember('nope',false)).
           assert(k1 instanceof StructType).
           assert(StructType.isA(k1)).
-          assert(K.resolveToInstance(k1.pointer)===k1).
-          mustThrowMatching(()=>K.resolveToInstance(null,true), /is-not-a my_struct/).
-          assert(k1 === StructType.instanceForPointer(k1.pointer)).
           mustThrowMatching(()=>k1.$ro = 1, /read-only/);
         Object.keys(MyStructDef.members).forEach(function(key){
           key = K.memberKey(key);
@@ -732,8 +759,7 @@ self.sqlite3InitModule = sqlite3InitModule;
                    " from "+k1.memoryDump());
         });
         T.assert('number' === typeof k1.pointer).
-          mustThrowMatching(()=>k1.pointer = 1, /pointer/).
+          mustThrowMatching(()=>k1.pointer = 1, /pointer/);
-          assert(K.instanceForPointer(k1.pointer) === k1);
         k1.$p4 = 1; k1.$pP = 2;
         T.assert(1 === k1.$p4).assert(2 === k1.$pP);
         if(MyStructDef.members.$p8){
@@ -748,22 +774,13 @@ self.sqlite3InitModule = sqlite3InitModule;
           assert('number' === typeof k1.$cstr).
           assert('A C-string.' === k1.memberToJsString('cstr'));
         k1.$pP = k2;
-        T.assert(k1.$pP === k2);
+        T.assert(k1.$pP === k2.pointer);
         k1.$pP = null/*null is special-cased to 0.*/;
         T.assert(0===k1.$pP);
         let ptr = k1.pointer;
         k1.dispose();
         T.assert(undefined === k1.pointer).
-          assert(undefined === K.instanceForPointer(ptr)).
           mustThrowMatching(()=>{k1.$pP=1}, /disposed instance/);
-        const k3 = new K();
-        ptr = k3.pointer;
-        T.assert(k3 === K.instanceForPointer(ptr));
-        K.disposeAll();
-        T.assert(ptr).
-          assert(undefined === k2.pointer).
-          assert(undefined === k3.pointer).
-          assert(undefined === K.instanceForPointer(ptr));
       }finally{
         k1.dispose();
         k2.dispose();
@@ -793,10 +810,8 @@ self.sqlite3InitModule = sqlite3InitModule;
           assert(wts instanceof WTStruct).
           assert(wts instanceof StructType).
           assert(StructType.isA(wts)).
-          assert(wts === StructType.instanceForPointer(wts.pointer));
+          assert(wts.pointer>0).assert(0===wts.$v4).assert(0n===wts.$v8).
-        T.assert(wts.pointer>0).assert(0===wts.$v4).assert(0n===wts.$v8).
+          assert(0===wts.$ppV).assert(0===wts.$xFunc);
-          assert(0===wts.$ppV).assert(0===wts.$xFunc).
-          assert(WTStruct.instanceForPointer(wts.pointer) === wts);
         const testFunc =
               W.xGet('sqlite3_wasm_test_struct'/*name gets mangled in -O3 builds!*/);
         let counter = 0;
@@ -805,7 +820,6 @@ self.sqlite3InitModule = sqlite3InitModule;
           /*log("This from a JS function called from C, "+
               "which itself was called from JS. arg =",arg);*/
           ++counter;
-          T.assert(WTStruct.instanceForPointer(arg) === wts);
           if(3===counter){
             tossQuietly("Testing exception propagation.");
           }
@@ -829,7 +843,7 @@ self.sqlite3InitModule = sqlite3InitModule;
         testFunc(wts.pointer);
         //log("wts.pointer, wts.$ppV",wts.pointer, wts.$ppV);
         T.assert(1===counter).assert(20 === wts.$v4).assert(40n === wts.$v8)
-          .assert(autoResolvePtr ? (wts.$ppV === wts) : (wts.$ppV === wts.pointer))
+          .assert(wts.$ppV === wts.pointer)
           .assert('string' === typeof wts.memberToJsString('cstr'))
           .assert(wts.memberToJsString('cstr') === wts.memberToJsString('$cstr'))
           .mustThrowMatching(()=>wts.memberToJsString('xFunc'),
@@ -837,279 +851,42 @@ self.sqlite3InitModule = sqlite3InitModule;
         ;
         testFunc(wts.pointer);
         T.assert(2===counter).assert(40 === wts.$v4).assert(80n === wts.$v8)
-          .assert(autoResolvePtr ? (wts.$ppV === wts) : (wts.$ppV === wts.pointer));
+          .assert(wts.$ppV === wts.pointer);
         /** The 3rd call to wtsFunc throw from JS, which is called
             from C, which is called from JS. Let's ensure that
             that exception propagates back here... */
         T.mustThrowMatching(()=>testFunc(wts.pointer),/^Testing/);
         W.uninstallFunction(wts.$xFunc);
         wts.$xFunc = 0;
-        if(autoResolvePtr){
+        wts.$ppV = 0;
-          wts.$ppV = 0;
+        T.assert(!wts.$ppV);
-          T.assert(!wts.$ppV);
+        //WTStruct.debugFlags(0x03);
-          //WTStruct.debugFlags(0x03);
+        wts.$ppV = wts;
-          wts.$ppV = wts;
+        T.assert(wts.pointer === wts.$ppV)
-          T.assert(wts === wts.$ppV)
-          //WTStruct.debugFlags(0);
-        }
         wts.setMemberCString('cstr', "A C-string.");
         T.assert(Array.isArray(wts.ondispose)).
           assert(wts.ondispose[0] === wts.$cstr).
           assert('A C-string.' === wts.memberToJsString('cstr'));
         const ptr = wts.pointer;
         wts.dispose();
-        T.assert(ptr).assert(undefined === wts.pointer).
+        T.assert(ptr).assert(undefined === wts.pointer);
-          assert(undefined === WTStruct.instanceForPointer(ptr))
       }finally{
         wts.dispose();
       }
+
+      if(1){ // ondispose of other struct instances
+        const s1 = new WTStruct, s2 = new WTStruct, s3 = new WTStruct;
+        T.assert(s1.lookupMember instanceof Function)
+          .assert(s1.addOnDispose instanceof Function);
+        s1.addOnDispose(s2,"testing variadic args");
+        T.assert(2===s1.ondispose.length);
+        s2.addOnDispose(s3);
+        s1.dispose();
+        T.assert(!s2.pointer,"Expecting s2 to be ondispose'd by s1.");
+        T.assert(!s3.pointer,"Expecting s3 to be ondispose'd by s2.");
+      }
     }/*StructBinder*/)
 
-  ////////////////////////////////////////////////////////////////////
-    .t('sqlite3.StructBinder part 2', function(sqlite3){
-      // https://www.sqlite.org/c3ref/vfs.html
-      // https://www.sqlite.org/c3ref/io_methods.html
-      const sqlite3_io_methods = capi.sqlite3_io_methods,
-            sqlite3_vfs = capi.sqlite3_vfs,
-            sqlite3_file = capi.sqlite3_file;
-      //log("struct sqlite3_file", sqlite3_file.memberKeys());
-      //log("struct sqlite3_vfs", sqlite3_vfs.memberKeys());
-      //log("struct sqlite3_io_methods", sqlite3_io_methods.memberKeys());
-      const installMethod = function callee(tgt, name, func){
-        if(1===arguments.length){
-          return (n,f)=>callee(tgt,n,f);
-        }
-        if(!callee.argcProxy){
-          callee.argcProxy = function(func,sig){
-            return function(...args){
-              if(func.length!==arguments.length){
-                toss("Argument mismatch. Native signature is:",sig);
-              }
-              return func.apply(this, args);
-            }
-          };
-          callee.ondisposeRemoveFunc = function(){
-            if(this.__ondispose){
-              const who = this;
-              this.__ondispose.forEach(
-                (v)=>{
-                  if('number'===typeof v){
-                    try{wasm.uninstallFunction(v)}
-                    catch(e){/*ignore*/}
-                  }else{/*wasm function wrapper property*/
-                    delete who[v];
-                  }
-                }
-              );
-              delete this.__ondispose;
-            }
-          };
-        }/*static init*/
-        const sigN = tgt.memberSignature(name),
-              memKey = tgt.memberKey(name);
-        //log("installMethod",tgt, name, sigN);
-        if(!tgt.__ondispose){
-          T.assert(undefined === tgt.ondispose);
-          tgt.ondispose = [callee.ondisposeRemoveFunc];
-          tgt.__ondispose = [];
-        }
-        const fProxy = callee.argcProxy(func, sigN);
-        const pFunc = wasm.installFunction(fProxy, tgt.memberSignature(name, true));
-        tgt[memKey] = pFunc;
-        /**
-           ACHTUNG: function pointer IDs are from a different pool than
-           allocation IDs, starting at 1 and incrementing in steps of 1,
-           so if we set tgt[memKey] to those values, we'd very likely
-           later misinterpret them as plain old pointer addresses unless
-           unless we use some silly heuristic like "all values <5k are
-           presumably function pointers," or actually perform a function
-           lookup on every pointer to first see if it's a function. That
-           would likely work just fine, but would be kludgy.
-
-           It turns out that "all values less than X are functions" is
-           essentially how it works in wasm: a function pointer is
-           reported to the client as its index into the
-           __indirect_function_table.
-
-           So... once jaccwabyt can be told how to access the
-           function table, it could consider all pointer values less
-           than that table's size to be functions.  As "real" pointer
-           values start much, much higher than the function table size,
-           that would likely work reasonably well. e.g. the object
-           pointer address for sqlite3's default VFS is (in this local
-           setup) 65104, whereas the function table has fewer than 600
-           entries.
-        */
-        const wrapperKey = '$'+memKey;
-        tgt[wrapperKey] = fProxy;
-        tgt.__ondispose.push(pFunc, wrapperKey);
-        //log("tgt.__ondispose =",tgt.__ondispose);
-        return (n,f)=>callee(tgt, n, f);
-      }/*installMethod*/;
-
-      const installIOMethods = function instm(iom){
-        (iom instanceof capi.sqlite3_io_methods) || toss("Invalid argument type.");
-        if(!instm._requireFileArg){
-          instm._requireFileArg = function(arg,methodName){
-            arg = capi.sqlite3_file.resolveToInstance(arg);
-            if(!arg){
-              err("sqlite3_io_methods::xClose() was passed a non-sqlite3_file.");
-            }
-            return arg;
-          };
-          instm._methods = {
-            // https://sqlite.org/c3ref/io_methods.html
-            xClose: /*i(P)*/function(f){
-              /* int (*xClose)(sqlite3_file*) */
-              log("xClose(",f,")");
-              if(!(f = instm._requireFileArg(f,'xClose'))) return capi.SQLITE_MISUSE;
-              f.dispose(/*noting that f has externally-owned memory*/);
-              return 0;
-            },
-            xRead: /*i(Ppij)*/function(f,dest,n,offset){
-              /* int (*xRead)(sqlite3_file*, void*, int iAmt, sqlite3_int64 iOfst) */
-              log("xRead(",arguments,")");
-              if(!(f = instm._requireFileArg(f))) return capi.SQLITE_MISUSE;
-              wasm.heap8().fill(0, dest + offset, n);
-              return 0;
-            },
-            xWrite: /*i(Ppij)*/function(f,dest,n,offset){
-              /* int (*xWrite)(sqlite3_file*, const void*, int iAmt, sqlite3_int64 iOfst) */
-              log("xWrite(",arguments,")");
-              if(!(f=instm._requireFileArg(f,'xWrite'))) return capi.SQLITE_MISUSE;
-              return 0;
-            },
-            xTruncate: /*i(Pj)*/function(f){
-              /* int (*xTruncate)(sqlite3_file*, sqlite3_int64 size) */
-              log("xTruncate(",arguments,")");
-              if(!(f=instm._requireFileArg(f,'xTruncate'))) return capi.SQLITE_MISUSE;
-              return 0;
-            },
-            xSync: /*i(Pi)*/function(f){
-              /* int (*xSync)(sqlite3_file*, int flags) */
-              log("xSync(",arguments,")");
-              if(!(f=instm._requireFileArg(f,'xSync'))) return capi.SQLITE_MISUSE;
-              return 0;
-            },
-            xFileSize: /*i(Pp)*/function(f,pSz){
-              /* int (*xFileSize)(sqlite3_file*, sqlite3_int64 *pSize) */
-              log("xFileSize(",arguments,")");
-              if(!(f=instm._requireFileArg(f,'xFileSize'))) return capi.SQLITE_MISUSE;
-              wasm.setMemValue(pSz, 0/*file size*/);
-              return 0;
-            },
-            xLock: /*i(Pi)*/function(f){
-              /* int (*xLock)(sqlite3_file*, int) */
-              log("xLock(",arguments,")");
-              if(!(f=instm._requireFileArg(f,'xLock'))) return capi.SQLITE_MISUSE;
-              return 0;
-            },
-            xUnlock: /*i(Pi)*/function(f){
-              /* int (*xUnlock)(sqlite3_file*, int) */
-              log("xUnlock(",arguments,")");
-              if(!(f=instm._requireFileArg(f,'xUnlock'))) return capi.SQLITE_MISUSE;
-              return 0;
-            },
-            xCheckReservedLock: /*i(Pp)*/function(){
-              /* int (*xCheckReservedLock)(sqlite3_file*, int *pResOut) */
-              log("xCheckReservedLock(",arguments,")");
-              return 0;
-            },
-            xFileControl: /*i(Pip)*/function(){
-              /* int (*xFileControl)(sqlite3_file*, int op, void *pArg) */
-              log("xFileControl(",arguments,")");
-              return capi.SQLITE_NOTFOUND;
-            },
-            xSectorSize: /*i(P)*/function(){
-              /* int (*xSectorSize)(sqlite3_file*) */
-              log("xSectorSize(",arguments,")");
-              return 0/*???*/;
-            },
-            xDeviceCharacteristics:/*i(P)*/function(){
-              /* int (*xDeviceCharacteristics)(sqlite3_file*) */
-              log("xDeviceCharacteristics(",arguments,")");
-              return 0;
-            }
-          };
-        }/*static init*/
-        iom.$iVersion = 1;
-        Object.keys(instm._methods).forEach(
-          (k)=>installMethod(iom, k, instm._methods[k])
-        );
-      }/*installIOMethods()*/;
-
-      const iom = new sqlite3_io_methods, sfile = new sqlite3_file;
-      const err = console.error.bind(console);
-      try {
-        const IOM = sqlite3_io_methods, S3F = sqlite3_file;
-        //log("iom proto",iom,iom.constructor.prototype);
-        //log("sfile",sfile,sfile.constructor.prototype);
-        T.assert(0===sfile.$pMethods).assert(iom.pointer > 0);
-        //log("iom",iom);
-        sfile.$pMethods = iom.pointer;
-        T.assert(iom.pointer === sfile.$pMethods)
-          .assert(IOM.resolveToInstance(iom))
-          .assert(undefined ===IOM.resolveToInstance(sfile))
-          .mustThrow(()=>IOM.resolveToInstance(0,true))
-          .assert(S3F.resolveToInstance(sfile.pointer))
-          .assert(undefined===S3F.resolveToInstance(iom))
-          .assert(iom===IOM.resolveToInstance(sfile.$pMethods));
-        T.assert(0===iom.$iVersion);
-        installIOMethods(iom);
-        T.assert(1===iom.$iVersion);
-        //log("iom.__ondispose",iom.__ondispose);
-        T.assert(Array.isArray(iom.__ondispose)).assert(iom.__ondispose.length>10);
-      }finally{
-        iom.dispose();
-        T.assert(undefined === iom.__ondispose);
-      }
-
-      const dVfs = new sqlite3_vfs(capi.sqlite3_vfs_find(null));
-      try {
-        const SB = sqlite3.StructBinder;
-        T.assert(dVfs instanceof SB.StructType)
-          .assert(dVfs.pointer)
-          .assert('sqlite3_vfs' === dVfs.structName)
-          .assert(!!dVfs.structInfo)
-          .assert(SB.StructType.hasExternalPointer(dVfs))
-          .assert(dVfs.$iVersion>0)
-          .assert('number'===typeof dVfs.$zName)
-          .assert('number'===typeof dVfs.$xSleep)
-          .assert(wasm.functionEntry(dVfs.$xOpen))
-          .assert(dVfs.memberIsString('zName'))
-          .assert(dVfs.memberIsString('$zName'))
-          .assert(!dVfs.memberIsString('pAppData'))
-          .mustThrowMatching(()=>dVfs.memberToJsString('xSleep'),
-                             /Invalid member type signature for C-string/)
-          .mustThrowMatching(()=>dVfs.memberSignature('nope'), /nope is not a mapped/)
-          .assert('string' === typeof dVfs.memberToJsString('zName'))
-          .assert(dVfs.memberToJsString('zName')===dVfs.memberToJsString('$zName'))
-        ;
-        //log("Default VFS: @",dVfs.pointer);
-        Object.keys(sqlite3_vfs.structInfo.members).forEach(function(mname){
-          const mk = sqlite3_vfs.memberKey(mname), mbr = sqlite3_vfs.structInfo.members[mname],
-                addr = dVfs[mk], prefix = 'defaultVfs.'+mname;
-          if(1===mbr.signature.length){
-            let sep = '?', val = undefined;
-            switch(mbr.signature[0]){
-                  // TODO: move this into an accessor, e.g. getPreferredValue(member)
-                case 'i': case 'j': case 'f': case 'd': sep = '='; val = dVfs[mk]; break
-                case 'p': case 'P': sep = '@'; val = dVfs[mk]; break;
-                case 's': sep = '=';
-                  val = dVfs.memberToJsString(mname);
-                  break;
-            }
-            //log(prefix, sep, val);
-          }else{
-            //log(prefix," = funcptr @",addr, wasm.functionEntry(addr));
-          }
-        });
-      }finally{
-        dVfs.dispose();
-        T.assert(undefined===dVfs.pointer);
-      }
-    }/*StructBinder part 2*/)
-  
   ////////////////////////////////////////////////////////////////////
     .t('sqlite3.wasm.pstack', function(sqlite3){
       const P = wasm.pstack;
@@ -1219,7 +996,40 @@ self.sqlite3InitModule = sqlite3InitModule;
     .t('Create db', function(sqlite3){
       const dbFile = '/tester1.db';
       wasm.sqlite3_wasm_vfs_unlink(0, dbFile);
-      const db = this.db = new sqlite3.oo1.DB(dbFile);
+      const db = this.db = new sqlite3.oo1.DB(dbFile, 0 ? 'ct' : 'c');
+      db.onclose = {
+        disposeAfter: [],
+        disposeBefore: [],
+        before: function(db){
+          while(this.disposeBefore.length){
+            const v = this.disposeBefore.shift();
+            console.debug("db.onclose.before cleaning up:",v);
+            if(wasm.isPtr(v)) wasm.dealloc(v);
+            else if(v instanceof sqlite3.StructBinder.StructType){
+              v.dispose();
+            }else if(v instanceof Function){
+              try{ v(db) } catch(e){
+                console.warn("beforeDispose() callback threw:",e);
+              }
+            }
+          }
+          console.debug("db.onclose.before dropping modules");
+          sqlite3.capi.sqlite3_drop_modules(db.pointer, 0);
+        },
+        after: function(){
+          while(this.disposeAfter.length){
+            const v = this.disposeAfter.shift();
+            console.debug("db.onclose.after cleaning up:",v);
+            if(wasm.isPtr(v)) wasm.dealloc(v);
+            else if(v instanceof sqlite3.StructBinder.StructType){
+              v.dispose();
+            }else if(v instanceof Function){
+              try{v()} catch(e){/*ignored*/}
+            }
+          }
+        }
+      };
+      
       T.assert(Number.isInteger(db.pointer))
         .mustThrowMatching(()=>db.pointer=1, /read-only/)
         .assert(0===sqlite3.capi.sqlite3_extended_result_codes(db.pointer,1))
@@ -1442,6 +1252,29 @@ self.sqlite3InitModule = sqlite3InitModule;
       rc = db.selectArray('select a, b from t where b=-1');
       T.assert(undefined === rc);
     })
+  ////////////////////////////////////////////////////////////////////////
+    .t('selectArrays/Objects()', function(sqlite3){
+      const db = this.db;
+      const sql = 'select a, b from t where a=? or b=? order by a';
+      let rc = db.selectArrays(sql, [1, 4]);
+      T.assert(Array.isArray(rc))
+        .assert(2===rc.length)
+        .assert(2===rc[0].length)
+        .assert(1===rc[0][0])
+        .assert(2===rc[0][1])
+        .assert(3===rc[1][0])
+        .assert(4===rc[1][1])
+      rc = db.selectArrays(sql, [99,99]);
+      T.assert(Array.isArray(rc)).assert(0===rc.length);
+      rc = db.selectObjects(sql, [1,4]);
+      T.assert(Array.isArray(rc))
+        .assert(2===rc.length)
+        .assert('object' === typeof rc[1])
+        .assert(1===rc[0].a)
+        .assert(2===rc[0].b)
+        .assert(3===rc[1].a)
+        .assert(4===rc[1].b);
+    })
 
   ////////////////////////////////////////////////////////////////////////
     .t({
@@ -1750,8 +1583,8 @@ self.sqlite3InitModule = sqlite3InitModule;
 
   ////////////////////////////////////////////////////////////////////
     .t({
-      name: 'C-side WASM tests (if compiled in)',
+      name: 'C-side WASM tests',
-      predicate: haveWasmCTests,
+      predicate: ()=>(haveWasmCTests() || "Not compiled in."),
       test: function(){
         const w = wasm, db = this.db;
         const stack = w.scopedAllocPush();
@@ -1834,9 +1667,398 @@ self.sqlite3InitModule = sqlite3InitModule;
       }
     }/* jaccwabyt-specific tests */)
 
+  ////////////////////////////////////////////////////////////////////////
+    .t({
+      name: 'virtual table #1',
+      predicate: ()=>!!capi.sqlite3_index_info,
+      test: function(sqlite3){
+        warn("The vtab/module JS bindings are experimental and subject to change.");
+        const vth = sqlite3.VtabHelper;
+        const tmplCols = Object.assign(Object.create(null),{
+          A: 0, B: 1
+        });
+        /**
+           The vtab demonstrated here is a JS-ification of
+           ext/misc/templatevtab.c.
+        */
+        const tmplMethods = {
+          xConnect: function(pDb, pAux, argc, argv, ppVtab, pzErr){
+            try{
+              const args = wasm.cArgvToJs(argc, argv);
+              T.assert(args.length>=3)
+                .assert(args[0] === 'testvtab')
+                .assert(args[1] === 'main')
+                .assert(args[2] === 'testvtab');
+              console.debug("xConnect() args =",args);
+              const rc = capi.sqlite3_declare_vtab(
+                pDb, "CREATE TABLE ignored(a,b)"
+              );
+              if(0===rc){
+                const t = vth.xVtab();
+                wasm.setPtrValue(ppVtab, t.pointer);
+                T.assert(t === vth.xVtab(wasm.getPtrValue(ppVtab)));
+              }
+              return rc;
+            }catch(e){
+              if(!(e instanceof sqlite3.WasmAllocError)){
+                wasm.dealloc(wasm.getPtrValue, pzErr);
+                wasm.setPtrValue(pzErr, wasm.allocCString(e.message));
+              }
+              return vth.xError('xConnect',e);
+            }
+          },
+          xDisconnect: function(pVtab){
+            try {
+              const t = vth.xVtab(pVtab, true);
+              t.dispose();
+              return 0;
+            }catch(e){
+              return vth.xError('xDisconnect',e);
+            }
+          },
+          xOpen: function(pVtab, ppCursor){
+            try{
+              const t = vth.xVtab(pVtab), c = vth.xCursor();
+              T.assert(t instanceof capi.sqlite3_vtab)
+                .assert(c instanceof capi.sqlite3_vtab_cursor);
+              wasm.setPtrValue(ppCursor, c.pointer);
+              c._rowId = 0;
+              return 0;
+            }catch(e){
+              return vth.xError('xOpen',e);
+            }
+          },
+          xClose: function(pCursor){
+            try{
+              const c = vth.xCursor(pCursor,true);
+              T.assert(c instanceof capi.sqlite3_vtab_cursor)
+                .assert(!vth.xCursor(pCursor));
+              c.dispose();
+              return 0;
+            }catch(e){
+              return vth.xError('xClose',e);
+            }
+          },
+          xNext: function(pCursor){
+            try{
+              const c = vth.xCursor(pCursor);
+              ++c._rowId;
+              return 0;
+            }catch(e){
+              return vth.xError('xNext',e);
+            }
+
+          },
+          xColumn: function(pCursor, pCtx, iCol){
+            try{
+              const c = vth.xCursor(pCursor);
+              switch(iCol){
+                  case tmplCols.A:
+                    capi.sqlite3_result_int(pCtx, 1000 + c._rowId);
+                    break;
+                  case tmplCols.B:
+                    capi.sqlite3_result_int(pCtx, 2000 + c._rowId);
+                    break;
+                  default: sqlite3.SQLite3Error.toss("Invalid column id",iCol);
+              }
+              return 0;
+            }catch(e){
+              return vth.xError('xColumn',e);
+            }
+          },
+          xRowid: function(pCursor, ppRowid64){
+            try{
+              const c = vth.xCursor(pCursor);
+              vth.xRowid(ppRowid64, c._rowId);
+              return 0;
+            }catch(e){
+              return vth.xError('xRowid',e);
+            }
+          },
+          xEof: function(pCursor){
+            const c = vth.xCursor(pCursor),
+                  rc = c._rowId>=10;
+            c.dispose();
+            return rc;
+          },
+          xFilter: function(pCursor, idxNum, idxCStr,
+                            argc, argv/* [sqlite3_value* ...] */){
+            try{
+              const c = vth.xCursor(pCursor);
+              c._rowId = 0;
+              const list = vth.sqlite3ValuesToJs(argc, argv);
+              T.assert(argc === list.length);
+              //log(argc,"xFilter value(s):",list);
+              c.dispose();
+              return 0;
+            }catch(e){
+              return vth.xError('xFilter',e);
+            }
+          },
+          xBestIndex: function(pVtab, pIdxInfo){
+            try{
+              //const t = vth.xVtab(pVtab);
+              const sii = capi.sqlite3_index_info;
+              const pii = new sii(pIdxInfo);
+              pii.$estimatedRows = 10;
+              pii.$estimatedCost = 10.0;
+              //log("xBestIndex $nConstraint =",pii.$nConstraint);
+              if(pii.$nConstraint>0){
+                // Validate nthConstraint() and nthConstraintUsage()
+                const max = pii.$nConstraint;
+                for(let i=0; i < max; ++i ){
+                  let v = pii.nthConstraint(i,true);
+                  T.assert(wasm.isPtr(v));
+                  v = pii.nthConstraint(i);
+                  T.assert(v instanceof sii.sqlite3_index_constraint)
+                    .assert(v.pointer >= pii.$aConstraint);
+                  v.dispose();
+                  v = pii.nthConstraintUsage(i,true);
+                  T.assert(wasm.isPtr(v));
+                  v = pii.nthConstraintUsage(i);
+                  T.assert(v instanceof sii.sqlite3_index_constraint_usage)
+                    .assert(v.pointer >= pii.$aConstraintUsage);
+                  v.$argvIndex = i;//just to get some values into xFilter
+                  v.dispose();
+                }
+              }
+              //log("xBestIndex $nOrderBy =",pii.$nOrderBy);
+              if(pii.$nOrderBy>0){
+                // Validate nthOrderBy()
+                const max = pii.$nOrderBy;
+                for(let i=0; i < max; ++i ){
+                  let v = pii.nthOrderBy(i,true);
+                  T.assert(wasm.isPtr(v));
+                  v = pii.nthOrderBy(i);
+                  T.assert(v instanceof sii.sqlite3_index_orderby)
+                    .assert(v.pointer >= pii.$aOrderBy);
+                  v.dispose();
+                }
+              }
+              pii.dispose();
+              return 0;
+            }catch(e){
+              return vth.xError('xBestIndex',e);
+            }
+          }
+        };
+        /**
+           The vtab API places relevance on whether xCreate and
+           xConnect are exactly the same function (same pointer
+           address). Two JS-side references to the same method will
+           end up, without acrobatics to counter it, being compiled as
+           two different WASM-side bindings, i.e. two different
+           pointers.
+
+           In order to account for this, VtabHelper.installMethods()
+           checks for duplicate function entries and maps them to the
+           same WASM-compiled instance.
+        */
+        if(1){
+          tmplMethods.xCreate = tmplMethods.xConnect;
+        }
+
+        const tmplMod = new sqlite3.capi.sqlite3_module();
+        tmplMod.$iVersion = 0;
+        this.db.onclose.disposeAfter.push(tmplMod);
+        vth.installMethods(tmplMod, tmplMethods, true);
+        if(tmplMethods.xCreate){
+          T.assert(tmplMod.$xCreate)
+            .assert(tmplMod.$xCreate === tmplMod.$xConnect,
+                    "installMethods() must avoid re-compiling identical functions");
+          tmplMod.$xCreate = 0;
+        }
+        let rc = capi.sqlite3_create_module(
+          this.db, "testvtab", tmplMod, 0
+        );
+        this.db.checkRc(rc);
+
+        const list = this.db.selectArrays(
+          "SELECT a,b FROM testvtab where a<9999 and b>1 order by a, b"
+          /* Query is shaped so that it will ensure that some constraints
+             end up in xBestIndex(). */
+        );
+        T.assert(10===list.length)
+          .assert(1000===list[0][0])
+          .assert(2009===list[list.length-1][1]);
+      }
+    })/*custom vtab #1*/
+
+  ////////////////////////////////////////////////////////////////////////
+    .t({
+      name: 'virtual table #2 (non-eponymous w/ automated exception wrapping)',
+      predicate: ()=>!!capi.sqlite3_index_info,
+      test: function(sqlite3){
+        warn("The vtab/module JS bindings are experimental and subject to change.");
+        const vth = sqlite3.VtabHelper;
+        const tmplCols = Object.assign(Object.create(null),{
+          A: 0, B: 1
+        });
+        /**
+           The vtab demonstrated here is a JS-ification of
+           ext/misc/templatevtab.c.
+        */
+        let throwOnCreate = 1 ? 0 : capi.SQLITE_CANTOPEN
+        /* ^^^ just for testing exception wrapping. Note that sqlite
+           always translates errors from a vtable to a generic
+           SQLITE_ERROR unless it's from xConnect()/xCreate() and that
+           callback sets an error string. */;
+        const vtabTrace = 1
+              ? ()=>{}
+              : (methodName,...args)=>console.debug('sqlite3_module::'+methodName+'():',...args);
+        const modConfig = {
+          /* catchExceptions changes how the methods are wrapped */
+          catchExceptions: true,
+          name: "vtab2test",
+          methods:{
+            xCreate: function(pDb, pAux, argc, argv, ppVtab, pzErr){
+              vtabTrace("xCreate",...arguments);
+              if(throwOnCreate){
+                sqlite3.SQLite3Error.toss(
+                  throwOnCreate,
+                  "Throwing a test exception."
+                );
+              }
+              const args = wasm.cArgvToJs(argc, argv);
+              vtabTrace("xCreate","argv:",args);
+              T.assert(args.length>=3);
+              const rc = capi.sqlite3_declare_vtab(
+                pDb, "CREATE TABLE ignored(a,b)"
+              );
+              if(0===rc){
+                const t = vth.xVtab();
+                wasm.setPtrValue(ppVtab, t.pointer);
+                T.assert(t === vth.xVtab(wasm.getPtrValue(ppVtab)));
+                vtabTrace("xCreate",...arguments," ppVtab =",t.pointer);
+              }
+              return rc;
+            },
+            xDestroy: function(pVtab){
+              vtabTrace("sqlite3_xDestroy",pVtab);
+              const t = vth.xVtab(pVtab, true);
+              T.assert(t);
+              t.dispose();
+            },
+            /*xConnect: function(pDb, pAux, argc, argv, ppVtab, pzErr){
+              vtabTrace("xConnect",...arguments);
+              const t = vth.xVtab();
+              wasm.setPtrValue(ppVtab, t.pointer);
+              T.assert(t === vth.xVtab(wasm.getPtrValue(ppVtab)));
+              vtabTrace("xConnect",...arguments,"ppVtab =",t.pointer);
+            },
+            xDisconnect: function(pVtab){
+              vtabTrace("xDisconnect",pVtab);
+              const t = vth.xVtab(pVtab, true);
+              T.assert(t);
+              t.dispose();
+            },*/
+            xOpen: function(pVtab, ppCursor){
+              const t = vth.xVtab(pVtab), c = vth.xCursor();
+              T.assert(t instanceof capi.sqlite3_vtab)
+                .assert(c instanceof capi.sqlite3_vtab_cursor);
+              wasm.setPtrValue(ppCursor, c.pointer);
+              vtabTrace("xOpen",...arguments," cursor =",c.pointer);
+              c._rowId = 0;
+            },
+            xClose: function(pCursor){
+              vtabTrace("xClose",...arguments);
+              const c = vth.xCursor(pCursor,true);
+              T.assert(c instanceof capi.sqlite3_vtab_cursor)
+                .assert(!vth.xCursor(pCursor));
+              c.dispose();
+            },
+            xNext: function(pCursor){
+              vtabTrace("xNext",...arguments);
+              const c = vth.xCursor(pCursor);
+              ++c._rowId;
+            },
+            xColumn: function(pCursor, pCtx, iCol){
+              vtabTrace("xColumn",...arguments);
+              const c = vth.xCursor(pCursor);
+              switch(iCol){
+                  case tmplCols.A:
+                    capi.sqlite3_result_int(pCtx, 1000 + c._rowId);
+                    break;
+                  case tmplCols.B:
+                    capi.sqlite3_result_int(pCtx, 2000 + c._rowId);
+                    break;
+                  default: sqlite3.SQLite3Error.toss("Invalid column id",iCol);
+              }
+            },
+            xRowid: function(pCursor, ppRowid64){
+              vtabTrace("xRowid",...arguments);
+              const c = vth.xCursor(pCursor);
+              vth.xRowid(ppRowid64, c._rowId);
+            },
+            xEof: function(pCursor){
+              vtabTrace("xEof",...arguments);
+              return vth.xCursor(pCursor)._rowId>=10;
+            },
+            xFilter: function(pCursor, idxNum, idxCStr,
+                              argc, argv/* [sqlite3_value* ...] */){
+              vtabTrace("xFilter",...arguments);
+              const c = vth.xCursor(pCursor);
+              c._rowId = 0;
+              const list = vth.sqlite3ValuesToJs(argc, argv);
+              T.assert(argc === list.length);
+            },
+            xBestIndex: function(pVtab, pIdxInfo){
+              vtabTrace("xBestIndex",...arguments);
+              //const t = vth.xVtab(pVtab);
+              const pii = vth.xIndexInfo(pIdxInfo);
+              pii.$estimatedRows = 10;
+              pii.$estimatedCost = 10.0;
+              pii.dispose();
+            }
+          }/*methods*/
+        };
+        const tmplMod = vth.setupModule(modConfig);
+        T.assert(tmplMod instanceof capi.sqlite3_module)
+          .assert(1===tmplMod.$iVersion);
+        this.db.onclose.disposeAfter.push(tmplMod);
+        this.db.checkRc(capi.sqlite3_create_module(
+          this.db.pointer, modConfig.name, tmplMod.pointer, 0
+        ));
+        this.db.exec([
+          "create virtual table testvtab2 using ",
+          modConfig.name,
+          "(arg1 blah, arg2 bloop)"
+        ]);
+        this.db.onclose.disposeBefore.push(function(db){
+          console.debug("testvtab2 disposeBefore handler...");
+          db.exec(
+            /**
+               DROP TABLE is the only way to get xDestroy() to be called.
+               If we DROP TABLE at the end of the containing
+               test function, xDestroy() is called. If we instead
+               delay it until db.onclose.before(), we're getting
+               "no such table"?
+            */
+            "DROP TABLE testvtab2"
+          );
+        });
+        let list = this.db.selectArrays(
+          "SELECT a,b FROM testvtab2 where a<9999 and b>1 order by a, b"
+          /* Query is shaped so that it will ensure that some
+             constraints end up in xBestIndex(). */
+        );
+        T.assert(10===list.length)
+          .assert(1000===list[0][0])
+          .assert(2009===list[list.length-1][1]);
+
+        list = this.db.selectArrays(
+          "SELECT a,b FROM testvtab2 where a<9999 and b>1 order by b, a limit 5"
+        );
+        T.assert(5===list.length)
+          .assert(1000===list[0][0])
+          .assert(2004===list[list.length-1][1]);
+      }
+    })/*custom vtab #2*/
+
+  ////////////////////////////////////////////////////////////////////////
     .t('Close db', function(){
-      T.assert(this.db).assert(Number.isInteger(this.db.pointer));
+      T.assert(this.db).assert(wasm.isPtr(this.db.pointer));
-      wasm.exports.sqlite3_wasm_db_reset(this.db.pointer);
+      //wasm.sqlite3_wasm_db_reset(this.db); // will leak virtual tables!
       this.db.close();
       T.assert(!this.db.pointer);
     })
@@ -1856,7 +2078,8 @@ self.sqlite3InitModule = sqlite3InitModule;
     })
     .t({
       name: 'kvvfs in main thread',
-      predicate: ()=>(isUIThread() ? true : "No local/sessionStorage in Worker"),
+      predicate: ()=>(isUIThread()
+                      || "local/sessionStorage are unavailable in a Worker"),
       test: function(sqlite3){
         const filename = this.kvvfsDbFile = 'session';
         const pVfs = capi.sqlite3_vfs_find('kvvfs');
@@ -1901,7 +2124,7 @@ self.sqlite3InitModule = sqlite3InitModule;
         delete this.kvvfsUnlink;
         delete this.JDb;
       }
-    }/*kvvfs sqlite3_js_vfs_create_file()*/)
+   }/*kvvfs sqlite3_js_vfs_create_file()*/)
   ;/* end kvvfs tests */
 
   ////////////////////////////////////////////////////////////////////////

manifest

@@ -1,5 +1,5 @@
-C Describe\sthe\sSQLITE_DBCONFIG_RESET_DATABASE\sflag's\spolicy\sregarding\svirtual\stables,\sper\s/chat\sdiscussion.
+C Initial\ssupport\sfor\svirtual\stables\simplemented\sin\sJavaScript.
-D 2022-12-08T12:51:11.019
+D 2022-12-08T15:00:53.415
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 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -491,37 +491,37 @@ F ext/userauth/sqlite3userauth.h 7f3ea8c4686db8e40b0a0e7a8e0b00fac13aa7a3
 F ext/userauth/user-auth.txt e6641021a9210364665fe625d067617d03f27b04
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-F ext/wasm/GNUmakefile bfa47f169468ca9db031105b0e336db29a88e93c3abd217d0bbb2b8731fa5413
+F ext/wasm/GNUmakefile 54c0db93a5493f625c0a993c12aee5d83951440eee03b2aecfc8aeb998182998
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-F ext/wasm/api/README.md 20a256f4aaae80035d2bb1c9e3e0a125570313a8d137d427471d7be10edde87a
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-F ext/wasm/api/sqlite3-api-oo1.js 91a7d7b9203fb0f031e6ba380a644a7f871e1798b388de399c01ed4087bac9e0
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-F ext/wasm/api/sqlite3-api-prologue.js 697a5989ad52a9ba7bc60b5436589bd05885ee2201d84c38c5e9af3876af3ba4
+F ext/wasm/api/sqlite3-api-prologue.js 1380e933325c11786b2afc93fc8ff88c2fd1ffeac3e0081da35e5a7317f20e09
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 F ext/wasm/api/sqlite3-license-version-header.js a661182fc93fc2cf212dfd0b987f8e138a3ac98f850b1112e29b5fbdaecc87c3
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+F ext/wasm/api/sqlite3-opfs-async-proxy.js 7795b84b66a7a8dedc791340709b310bb497c3c72a80bef364fa2a58e2ddae3f
-F ext/wasm/api/sqlite3-vfs-helper.js 4ad4faf02e1524bf0296be8452c00b5708dce6faf649468d0377e26a0b299263
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 F ext/wasm/api/sqlite3-wasi.h 25356084cfe0d40458a902afb465df8c21fc4152c1d0a59b563a3fba59a068f9
-F ext/wasm/api/sqlite3-wasm.c b0babf8435f31d21f28454fb81433aa538c68b23d0a4a251f0666fdec4e71f59
+F ext/wasm/api/sqlite3-wasm.c 97034ab4f40ec1fac71ccfaf3afffdca6b1ea2dcd95b7871527bad0f34e152b0
 F ext/wasm/api/sqlite3-worker1-promiser.js 0c7a9826dbf82a5ed4e4f7bf7816e825a52aff253afbf3350431f5773faf0e4b
 F ext/wasm/api/sqlite3-worker1.js 1e54ea3d540161bcfb2100368a2fc0cad871a207b8336afee1c445715851ec54
 F ext/wasm/batch-runner.html 4deeed44fe41496dc6898d9fb17938ea3291f40f4bfb977e29d0cef96fbbe4c8
 F ext/wasm/batch-runner.js 49609e89aaac9989d6c1ad3fae268e4878e1ad7bc5fd3e5c2f44959660780b2e
 F ext/wasm/c-pp.c 92285f7bce67ed7b7020b40fde8ed0982c442b63dc33df9dfd4b658d4a6c0779
 F ext/wasm/common/SqliteTestUtil.js d8bf97ecb0705a2299765c8fc9e11b1a5ac7f10988bbf375a6558b7ca287067b
-F ext/wasm/common/emscripten.css 3d253a6fdb8983a2ac983855bfbdd4b6fa1ff267c28d69513dd6ef1f289ada3f
+F ext/wasm/common/emscripten.css 11bd104b6c0d597c67d40cc8ecc0a60dae2b965151e3b6a37fa5708bac3acd15
-F ext/wasm/common/testing.css 35889709547d89a6109ff83b25c11bbc91d8dd43aab8722e428655ca98880a06
+F ext/wasm/common/testing.css 0ff15602a3ab2bad8aef2c3bd120c7ee3fd1c2054ad2ace7e214187ae68d926f
-F ext/wasm/common/whwasmutil.js c1bc5715cd96728929cc31d788b16152ccbd6b2e111d2e88fbc9725247e67b4f
+F ext/wasm/common/whwasmutil.js f0a742270b490748b9fdb0974287429b036698609b40eee81f13fe13e64358a7
 F ext/wasm/demo-123-worker.html a0b58d9caef098a626a1a1db567076fca4245e8d60ba94557ede8684350a81ed
 F ext/wasm/demo-123.html 8c70a412ce386bd3796534257935eb1e3ea5c581e5d5aea0490b8232e570a508
 F ext/wasm/demo-123.js ebae30756585bca655b4ab2553ec9236a87c23ad24fc8652115dcedb06d28df6
@@ -539,23 +539,23 @@ F ext/wasm/fiddle/fiddle.js 974b995119ac443685d7d94d3b3c58c6a36540e9eb3fed7069d5
 F ext/wasm/fiddle/index.html 5daf54e8f3d7777cbb1ca4f93affe28858dbfff25841cb4ab81d694efed28ec2
 F ext/wasm/index-dist.html c806b6005145b71d64240606e9c6e0bf56878ee8829c66fe7486cebf34b0e6b1
 F ext/wasm/index.html f151b7c7b5cfdc066567d556acd168e769efd4e982286dc5f849a5ee69ecd0ff
-F ext/wasm/jaccwabyt/jaccwabyt.js 95f573de1826474c9605dda620ee622fcb1673ae74f191eb324c0853aa4dcb66
+F ext/wasm/jaccwabyt/jaccwabyt.js 06f2ef1ad640c26c593def3d960336e9bb789819b920516480895c38ed5f58fa
-F ext/wasm/jaccwabyt/jaccwabyt.md 9aa6951b529a8b29f578ec8f0355713c39584c92cf1708f63ba0cf917cb5b68e
+F ext/wasm/jaccwabyt/jaccwabyt.md 37911f00db12cbcca73aa1ed72594430365f30aafae2fa9c886961de74e5e0eb
 F ext/wasm/module-symbols.html 980680c8acfa3c8ae6a5aa223512d1b8e78040ced20f8ba2c382129bc73ec028
 F ext/wasm/scratchpad-wasmfs-main.html 20cf6f1a8f368e70d01e8c17200e3eaa90f1c8e1029186d836d14b83845fbe06
 F ext/wasm/scratchpad-wasmfs-main.js 4c140457f4d6da9d646a49addd91edb6e9ad1643c6c48e3258b5bce24725dc18
 F ext/wasm/speedtest1-wasmfs.html bc28eb29b69a73864b8d7aae428448f8b7e1de81d8bfb9bba99541322054dbd0
-F ext/wasm/speedtest1-worker.html e94cecebcbb9d187647025edd04d37af9789dfba98c2cc439b549b5ae8a8bc93
+F ext/wasm/speedtest1-worker.html fe6b36a63de1012bb9fb4d2fb888b6de9c589c21b0aa3ae054459b0093e077bf
 F ext/wasm/speedtest1-worker.js 13b57c4a41729678a1194014afec2bd5b94435dcfc8d1039dfa9a533ac819ee1
-F ext/wasm/speedtest1.html e4c4e5c1c8ec1ad13c995e346e4216a1df152fd2c5cd17e0793b865b2f3c5000
+F ext/wasm/speedtest1.html ff048b4a623aa192e83e143e48f1ce2a899846dd42c023fdedc8772b6e3f07da
 F ext/wasm/split-speedtest1-script.sh a3e271938d4d14ee49105eb05567c6a69ba4c1f1293583ad5af0cd3a3779e205 x
 F ext/wasm/sql/000-mandelbrot.sql 775337a4b80938ac8146aedf88808282f04d02d983d82675bd63d9c2d97a15f0
 F ext/wasm/sql/001-sudoku.sql 35b7cb7239ba5d5f193bc05ec379bcf66891bce6f2a5b3879f2f78d0917299b5
 F ext/wasm/test-opfs-vfs.html 1f2d672f3f3fce810dfd48a8d56914aba22e45c6834e262555e685bce3da8c3f
 F ext/wasm/test-opfs-vfs.js 44363db07b2a20e73b0eb1808de4400ca71b703af718d0fa6d962f15e73bf2ac
-F ext/wasm/tester1-worker.html 29b1d87f7d51f70d61645719fee657f3787fe939bb695f27034c75404e8f1e6f
+F ext/wasm/tester1-worker.html d43f3c131d88f10d00aff3e328fed13c858d674ea2ff1ff90225506137f85aa9
-F ext/wasm/tester1.c-pp.html 74aa9b31c75f12490653f814b53c3dd39f40cd3f70d6a53a716f4e8587107399
+F ext/wasm/tester1.c-pp.html d34bef3d48e5cbc1c7c06882ad240fec49bf88f5f65696cc2c72c416933aa406
-F ext/wasm/tester1.c-pp.js d096a8fadfd27caa680a4311b1d529551f8fe885a63dd27457c87b6008c64632
+F ext/wasm/tester1.c-pp.js ecd0ecd6c9f0c5bce7f39a3ccb28151c7ae7b1042379a0c855e930661579f2e8
 F ext/wasm/tests/opfs/concurrency/index.html 86d8ac435074d1e7007b91105f4897f368c165e8cecb6a9aa3d81f5cf5dcbe70
 F ext/wasm/tests/opfs/concurrency/test.js a98016113eaf71e81ddbf71655aa29b0fed9a8b79a3cdd3620d1658eb1cc9a5d
 F ext/wasm/tests/opfs/concurrency/worker.js 0a8c1a3e6ebb38aabbee24f122693f1fb29d599948915c76906681bb7da1d3d2
@@ -2067,8 +2067,9 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 212927e97e7be7d237de08359dce0dfb9211ac406b32009a6e15afd79c006475
+P 53dcb81b029e4422bdc0b5cf694183854b997195427d437b6154ed4dad7ad0ba 51e3c3b569dce2097063d39dc484f44b2f98cad0a902ef66765ca4cdc3e06f47
-R fada471bb8a33625833c6790242167a1
+R 8761e73b7826ed273f62994737b011e2
+T +closed 51e3c3b569dce2097063d39dc484f44b2f98cad0a902ef66765ca4cdc3e06f47 Closed\sby\sintegrate-merge.
 U stephan
-Z f05b54503032cba875652db3d0ee8337
+Z b6d983dab7ab65c0caebb5e5bbac6324
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-53dcb81b029e4422bdc0b5cf694183854b997195427d437b6154ed4dad7ad0ba
+a1454744c770a30a32a6d7b7fc59ef7be48cf67348b238540592850d7c2c7757