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

src/ia32/codegen-ia32.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 4879 matching lines @@
   // Spill everything, even constants, to the frame.
   frame_->SpillAll();
 
   frame_->DebugBreak();
   // Ignore the return value.
 #endif
 }
 
 
 Result 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()->EmitPush(Immediate(function_info));
     return frame()->CallStub(&stub, 1);
   } else {
     // Call the runtime to instantiate the function based on the
     // shared function info.
     frame()->EmitPush(esi);
     frame()->EmitPush(Immediate(function_info));
-    return frame()->CallRuntime(Runtime::kNewClosure, 2);
+    frame()->EmitPush(Immediate(pretenure
+                                ? Factory::true_value()
+                                : Factory::false_value()));
+    return frame()->CallRuntime(Runtime::kNewClosure, 3);
   }
 }
 
 
 void CodeGenerator::VisitFunctionLiteral(FunctionLiteral* node) {
   Comment cmnt(masm_, "[ FunctionLiteral");
   ASSERT(!in_safe_int32_mode());
   // 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;
   }
-  Result result = InstantiateFunction(function_info);
+  Result result = InstantiateFunction(function_info, node->pretenure());
   frame()->Push(&result);
 }
 
 
 void CodeGenerator::VisitSharedFunctionInfoLiteral(
     SharedFunctionInfoLiteral* node) {
   ASSERT(!in_safe_int32_mode());
   Comment cmnt(masm_, "[ SharedFunctionInfoLiteral");
-  Result result = InstantiateFunction(node->shared_function_info());
+  Result result = InstantiateFunction(node->shared_function_info(), false);
   frame()->Push(&result);
 }
 
 
 void CodeGenerator::VisitConditional(Conditional* node) {
   Comment cmnt(masm_, "[ Conditional");
   ASSERT(!in_safe_int32_mode());
   JumpTarget then;
   JumpTarget else_;
   JumpTarget exit;
@@ skipping 5313 matching lines @@
   masm.GetCode(&desc);
   // Call the function from C++.
   return FUNCTION_CAST<MemCopyFunction>(buffer);
 }
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_IA32