Force pretenuring of closures that are immediately assigned to...

src/x64/codegen-x64.cc

 // Copyright 2010 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 4226 matching lines @@
   // Spill everything, even constants, to the frame.
   frame_->SpillAll();
 
   frame_->DebugBreak();
   // Ignore the return value.
 #endif
 }
 
 
 void CodeGenerator::InstantiateFunction(
-    Handle<SharedFunctionInfo> function_info) {
+    Handle<SharedFunctionInfo> function_info,
+    bool pretenure) {
   // The inevitable call will sync frame elements to memory anyway, so
   // we do it eagerly to allow us to push the arguments directly into
   // place.
   frame_->SyncRange(0, frame_->element_count() - 1);
 
   // Use the fast case closure allocation code that allocates in new
   // space for nested functions that don't need literals cloning.
-  if (scope()->is_function_scope() && function_info->num_literals() == 0) {
+  if (scope()->is_function_scope() &&
+      function_info->num_literals() == 0 &&
+      !pretenure) {
     FastNewClosureStub stub;
     frame_->Push(function_info);
     Result answer = frame_->CallStub(&stub, 1);
     frame_->Push(&answer);
   } else {
     // Call the runtime to instantiate the function based on the
     // shared function info.
     frame_->EmitPush(rsi);
     frame_->EmitPush(function_info);
-    Result result = frame_->CallRuntime(Runtime::kNewClosure, 2);
+    frame_->EmitPush(pretenure
+                     ? Factory::true_value()
+                     : Factory::false_value());
+    Result result = frame_->CallRuntime(Runtime::kNewClosure, 3);
     frame_->Push(&result);
   }
 }
 
 
 void CodeGenerator::VisitFunctionLiteral(FunctionLiteral* node) {
   Comment cmnt(masm_, "[ FunctionLiteral");
 
   // Build the function info and instantiate it.
   Handle<SharedFunctionInfo> function_info =
       Compiler::BuildFunctionInfo(node, script());
   // Check for stack-overflow exception.
   if (function_info.is_null()) {
     SetStackOverflow();
     return;
   }
-  InstantiateFunction(function_info);
+  InstantiateFunction(function_info, node->pretenure());
 }
 
 
 void CodeGenerator::VisitSharedFunctionInfoLiteral(
     SharedFunctionInfoLiteral* node) {
   Comment cmnt(masm_, "[ SharedFunctionInfoLiteral");
-  InstantiateFunction(node->shared_function_info());
+  InstantiateFunction(node->shared_function_info(), false);
 }
 
 
 void CodeGenerator::VisitConditional(Conditional* node) {
   Comment cmnt(masm_, "[ Conditional");
   JumpTarget then;
   JumpTarget else_;
   JumpTarget exit;
   ControlDestination dest(&then, &else_, true);
   LoadCondition(node->condition(), &dest, true);
@@ skipping 4572 matching lines @@
 #undef __
 
 void RecordWriteStub::Generate(MacroAssembler* masm) {
   masm->RecordWriteHelper(object_, addr_, scratch_);
   masm->ret(0);
 }
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64