[wasm] Adding feature to JIT a wasm function at runtime and hook up the compiled code into the indi…

src/wasm/wasm-module.cc

 // Copyright 2015 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.
 
 #include "src/base/atomic-utils.h"
 #include "src/macro-assembler.h"
 #include "src/objects.h"
 #include "src/property-descriptor.h"
 #include "src/v8.h"
 
@@ skipping 390 matching lines @@
     bool modified = LinkFunction(code, imports, Code::WASM_TO_JS_FUNCTION);
     if (modified) {
       Assembler::FlushICache(isolate, code->instruction_start(),
                              code->instruction_size());
     }
   }
 }
 
 }  // namespace
 
-WasmModule::WasmModule()
-    : module_start(nullptr),
+WasmModule::WasmModule(byte* module_start)
+    : module_start(module_start),
       module_end(nullptr),
       min_mem_pages(0),
       max_mem_pages(0),
       mem_export(false),
       mem_external(false),
       start_function_index(-1),
       origin(kWasmOrigin),
       globals_size(0),
       indirect_table_size(0),
       pending_tasks(new base::Semaphore(0)) {}
@@ skipping 946 matching lines @@
     return static_cast<int32_t>(HeapNumber::cast(*result)->value());
   }
   thrower.Error("WASM.compileRun() failed: Return value should be number");
   return -1;
 }
 
 }  // namespace testing
 }  // namespace wasm
 }  // namespace internal
 }  // namespace v8