[wasm] Support for restricted table imports.

test/mjsunit/wasm/wasm-module-builder.js

 // Copyright 2016 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Used for encoding f32 and double constants to bits.
 let __buffer = new ArrayBuffer(8);
 let byte_view = new Int8Array(__buffer);
 let f32_view = new Float32Array(__buffer);
 let f64_view = new Float64Array(__buffer);
 
@@ skipping 186 matching lines @@
     return this.num_imported_globals++;
   }
 
   addImportedMemory(module, name, initial = 0, maximum) {
     let o = {module: module, name: name, kind: kExternalMemory,
              initial: initial, maximum: maximum};
     this.imports.push(o);
     return this;
   }
 
+  addImportedTable(module, name, initial, maximum) {
+    let o = {module: module, name: name, kind: kExternalTable, initial: initial,
+             maximum: maximum};
+    this.imports.push(o);
+  }
+
   addExport(name, index) {
     this.exports.push({name: name, kind: kExternalFunction, index: index});
     return this;
   }
 
   addExportOfKind(name, kind, index) {
     this.exports.push({name: name, kind: kind, index: index});
     return this;
   }
 
@@ skipping 65 matching lines @@
           if (imp.kind == kExternalFunction) {
             section.emit_u32v(imp.type);
           } else if (imp.kind == kExternalGlobal) {
             section.emit_u32v(imp.type);
             section.emit_u8(imp.mutable);
           } else if (imp.kind == kExternalMemory) {
             var has_max = (typeof imp.maximum) != "undefined";
             section.emit_u8(has_max ? 1 : 0); // flags
             section.emit_u32v(imp.initial); // initial
             if (has_max) section.emit_u32v(imp.maximum); // maximum
+          } else if (imp.kind == kExternalTable) {
+            section.emit_u8(kWasmAnyFunctionTypeForm);
+            var has_max = (typeof imp.maximum) != "undefined";
+            section.emit_u8(has_max ? 1 : 0); // flags
+            section.emit_u32v(imp.initial); // initial
+            if (has_max) section.emit_u32v(imp.maximum); // maximum
           } else {
             throw new Error("unknown/unsupported import kind " + imp.kind);
           }
         }
       });
     }
 
     // Add functions declarations
     let has_names = false;
     let names = false;
@@ skipping 231 matching lines @@
     }
     return buffer;
   }
 
   instantiate(...args) {
     let module = new WebAssembly.Module(this.toBuffer());
     let instance = new WebAssembly.Instance(module, ...args);
     return instance;
   }
 }