[wasm] Prerequisites for WebAssembly Table.Grow

test/cctest/wasm/wasm-run-utils.h

 // 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.
 
 #ifndef WASM_RUN_UTILS_H
 #define WASM_RUN_UTILS_H
 
 #include <setjmp.h>
 #include <stdint.h>
 #include <stdlib.h>
@@ skipping 229 matching lines @@
                                        SignatureMap()});
     WasmIndirectFunctionTable& table = module_.function_tables.back();
     table.min_size = table_size;
     table.max_size = table_size;
     for (uint32_t i = 0; i < table_size; ++i) {
       table.values.push_back(function_indexes[i]);
       table.map.FindOrInsert(module_.functions[function_indexes[i]].sig);
     }
 
     instance->function_tables.push_back(
-        isolate_->factory()->NewFixedArray(table_size * 2));
+        isolate_->factory()->NewFixedArray(table_size));
+    instance->signature_tables.push_back(
+        isolate_->factory()->NewFixedArray(table_size));
   }
 
   void PopulateIndirectFunctionTable() {
     if (execution_mode_ == kExecuteInterpreted) return;
     // Initialize the fixed arrays in instance->function_tables.
     for (uint32_t i = 0; i < instance->function_tables.size(); i++) {
       WasmIndirectFunctionTable& table = module_.function_tables[i];
-      Handle<FixedArray> array = instance->function_tables[i];
+      Handle<FixedArray> function_table = instance->function_tables[i];
+      Handle<FixedArray> signature_table = instance->signature_tables[i];
       int table_size = static_cast<int>(table.values.size());
       for (int j = 0; j < table_size; j++) {
         WasmFunction& function = module_.functions[table.values[j]];
-        array->set(j, Smi::FromInt(table.map.Find(function.sig)));
-        array->set(j + table_size,
-                   *instance->function_code[function.func_index]);
+        signature_table->set(j, Smi::FromInt(table.map.Find(function.sig)));
+        function_table->set(j, *instance->function_code[function.func_index]);
       }
     }
   }
 
   uint32_t AddBytes(Vector<const byte> bytes) {
     Handle<SeqOneByteString> old_bytes(
         instance_object_->compiled_module()->module_bytes(), isolate_);
     uint32_t old_size = static_cast<uint32_t>(old_bytes->length());
     ScopedVector<byte> new_bytes(old_size + bytes.length());
     memcpy(new_bytes.start(), old_bytes->GetChars(), old_size);
@@ skipping 521 matching lines @@
   void RunWasm_##name(WasmExecutionMode execution_mode)
 
 #define WASM_EXEC_COMPILED_TEST(name)                                \
   void RunWasm_##name(WasmExecutionMode execution_mode);             \
   TEST(RunWasmCompiled_##name) { RunWasm_##name(kExecuteCompiled); } \
   void RunWasm_##name(WasmExecutionMode execution_mode)
 
 }  // namespace
 
 #endif