[wasm] Add support for import section.

src/compiler/wasm-compiler.h

 // 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.
 
 #ifndef V8_COMPILER_WASM_COMPILER_H_
 #define V8_COMPILER_WASM_COMPILER_H_
 
 // Clients of this interface shouldn't depend on lots of compiler internals.
 // Do not include anything from src/compiler here!
 #include "src/wasm/wasm-opcodes.h"
@@ skipping 22 matching lines @@
 
 namespace compiler {
 // Compiles a single function, producing a code object.
 Handle<Code> CompileWasmFunction(wasm::ErrorThrower& thrower, Isolate* isolate,
                                  wasm::ModuleEnv* module_env,
                                  const wasm::WasmFunction& function);
 
 // Wraps a JS function, producing a code object that can be called from WASM.
 Handle<Code> CompileWasmToJSWrapper(Isolate* isolate, wasm::ModuleEnv* module,
                                     Handle<JSFunction> function,
-                                    uint32_t index);
+                                    wasm::FunctionSig* sig, const char* name);
 
 // Wraps a given wasm code object, producing a JSFunction that can be called
 // from JavaScript.
 Handle<JSFunction> CompileJSToWasmWrapper(
     Isolate* isolate, wasm::ModuleEnv* module, Handle<String> name,
     Handle<Code> wasm_code, Handle<JSObject> module_object, uint32_t index);
 
 // Abstracts details of building TurboFan graph nodes for WASM to separate
 // the WASM decoder from the internal details of TurboFan.
 class WasmTrapHelper;
@@ skipping 39 matching lines @@
   //-----------------------------------------------------------------------
   Node* Branch(Node* cond, Node** true_node, Node** false_node);
   Node* Switch(unsigned count, Node* key);
   Node* IfValue(int32_t value, Node* sw);
   Node* IfDefault(Node* sw);
   Node* Return(unsigned count, Node** vals);
   Node* ReturnVoid();
   Node* Unreachable();
 
   Node* CallDirect(uint32_t index, Node** args);
+  Node* CallImport(uint32_t index, Node** args);
   Node* CallIndirect(uint32_t index, Node** args);
   void BuildJSToWasmWrapper(Handle<Code> wasm_code, wasm::FunctionSig* sig);
   void BuildWasmToJSWrapper(Handle<JSFunction> function,
                             wasm::FunctionSig* sig);
   Node* ToJS(Node* node, Node* context, wasm::LocalType type);
   Node* FromJS(Node* node, Node* context, wasm::LocalType type);
   Node* Invert(Node* node);
   Node* FunctionTable();
 
   //-----------------------------------------------------------------------
@@ skipping 81 matching lines @@
     Node** buf = Buffer(count);
     if (buf != buffer) memcpy(buf, buffer, count * sizeof(Node*));
     return buf;
   }
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_COMPILER_WASM_COMPILER_H_