CodeStubAssembler can generate code for builtins

test/cctest/compiler/function-tester.h

 // Copyright 2014 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_CCTEST_COMPILER_FUNCTION_TESTER_H_
 #define V8_CCTEST_COMPILER_FUNCTION_TESTER_H_
 
 #include "src/ast/ast-numbering.h"
 #include "src/ast/scopes.h"
 #include "src/compiler.h"
@@ skipping 24 matching lines @@
     CHECK_EQ(0u, flags_ & ~supported_flags);
   }
 
   FunctionTester(Graph* graph, int param_count)
       : isolate(main_isolate()),
         function(NewFunction(BuildFunction(param_count).c_str())),
         flags_(0) {
     CompileGraph(graph);
   }
 
+  FunctionTester(int param_count, Handle<Code> code)
+      : isolate(main_isolate()),
+        function(NewFunction(BuildFunction(param_count).c_str())),
+        flags_(0) {
+    Compile(function);
+    function->ReplaceCode(*code);
+  }
+
   FunctionTester(const CallInterfaceDescriptor& descriptor, Handle<Code> code)
       : isolate(main_isolate()),
         function(
             (FLAG_allow_natives_syntax = true,
              NewFunction(BuildFunctionFromDescriptor(descriptor).c_str()))),
         flags_(0) {
     Compile(function);
     function->ReplaceCode(*code);
   }
 
   Isolate* isolate;
   Handle<JSFunction> function;
 
   MaybeHandle<Object> Call() {
     return Execution::Call(isolate, function, undefined(), 0, nullptr);
   }
 
   MaybeHandle<Object> Call(Handle<Object> a, Handle<Object> b) {
     Handle<Object> args[] = {a, b};
     return Execution::Call(isolate, function, undefined(), 2, args);
   }
 
+  MaybeHandle<Object> Call(Handle<Object> a, Handle<Object> b,
+                           Handle<Object> c) {
+    Handle<Object> args[] = {a, b, c};
+    return Execution::Call(isolate, function, undefined(), 3, args);
+  }
+
   MaybeHandle<Object> Call(Handle<Object> a, Handle<Object> b, Handle<Object> c,
                            Handle<Object> d) {
     Handle<Object> args[] = {a, b, c, d};
     return Execution::Call(isolate, function, undefined(), 4, args);
   }
 
   void CheckThrows(Handle<Object> a, Handle<Object> b) {
     TryCatch try_catch(reinterpret_cast<v8::Isolate*>(isolate));
     MaybeHandle<Object> no_result = Call(a, b);
     CHECK(isolate->has_pending_exception());
@@ skipping 161 matching lines @@
     CHECK(!code.is_null());
     function->ReplaceCode(*code);
     return function;
   }
 };
 }  // namespace compiler
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_CCTEST_COMPILER_FUNCTION_TESTER_H_