Make eval consider anything on the form eval(args...) a potential direct cal

src/x64/full-codegen-x64.cc

 // Copyright 2011 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 2081 matching lines @@
   CallFunctionStub stub(arg_count, flags);
   __ CallStub(&stub);
   RecordJSReturnSite(expr);
   // Restore context register.
   __ movq(rsi, Operand(rbp, StandardFrameConstants::kContextOffset));
   // Discard the function left on TOS.
   context()->DropAndPlug(1, rax);
 }
 
 
-void FullCodeGenerator::EmitResolvePossiblyDirectEval(ResolveEvalFlag flag,
-                                                      int arg_count) {
+void FullCodeGenerator::EmitResolvePossiblyDirectEval(int arg_count) {
   // Push copy of the first argument or undefined if it doesn't exist.
   if (arg_count > 0) {
     __ push(Operand(rsp, arg_count * kPointerSize));
   } else {
     __ PushRoot(Heap::kUndefinedValueRootIndex);
   }
 
   // Push the receiver of the enclosing function and do runtime call.
   __ push(Operand(rbp, (2 + info_->scope()->num_parameters()) * kPointerSize));
 
   // Push the strict mode flag. In harmony mode every eval call
   // is a strict mode eval call.
   StrictModeFlag strict_mode =
       FLAG_harmony_scoping ? kStrictMode : strict_mode_flag();
   __ Push(Smi::FromInt(strict_mode));
 
-  __ CallRuntime(flag == SKIP_CONTEXT_LOOKUP
-                 ? Runtime::kResolvePossiblyDirectEvalNoLookup
-                 : Runtime::kResolvePossiblyDirectEval, 4);
+  __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 4);
 }
 
 
 void FullCodeGenerator::VisitCall(Call* expr) {
 #ifdef DEBUG
   // We want to verify that RecordJSReturnSite gets called on all paths
   // through this function.  Avoid early returns.
   expr->return_is_recorded_ = false;
 #endif
 
@@ skipping 10 matching lines @@
     int arg_count = args->length();
     { PreservePositionScope pos_scope(masm()->positions_recorder());
       VisitForStackValue(callee);
       __ PushRoot(Heap::kUndefinedValueRootIndex);  // Reserved receiver slot.
 
       // Push the arguments.
       for (int i = 0; i < arg_count; i++) {
         VisitForStackValue(args->at(i));
       }
 
-      // If we know that eval can only be shadowed by eval-introduced
-      // variables we attempt to load the global eval function directly in
-      // generated code. If we succeed, there is no need to perform a
-      // context lookup in the runtime system.
-      Label done;
-      Variable* var = proxy->var();
-      if (!var->IsUnallocated() && var->mode() == DYNAMIC_GLOBAL) {
-        Label slow;
-        EmitLoadGlobalCheckExtensions(var, NOT_INSIDE_TYPEOF, &slow);
-        // Push the function and resolve eval.
-        __ push(rax);
-        EmitResolvePossiblyDirectEval(SKIP_CONTEXT_LOOKUP, arg_count);
-        __ jmp(&done);
-        __ bind(&slow);
-      }
-
       // Push a copy of the function (found below the arguments) and resolve
       // eval.
       __ push(Operand(rsp, (arg_count + 1) * kPointerSize));
-      EmitResolvePossiblyDirectEval(PERFORM_CONTEXT_LOOKUP, arg_count);
-      __ bind(&done);
+      EmitResolvePossiblyDirectEval(arg_count);
 
       // The runtime call returns a pair of values in rax (function) and
       // rdx (receiver). Touch up the stack with the right values.
       __ movq(Operand(rsp, (arg_count + 0) * kPointerSize), rdx);
       __ movq(Operand(rsp, (arg_count + 1) * kPointerSize), rax);
     }
     // Record source position for debugger.
     SetSourcePosition(expr->position());
     CallFunctionStub stub(arg_count, RECEIVER_MIGHT_BE_IMPLICIT);
     __ CallStub(&stub);
@@ skipping 2090 matching lines @@
   *context_length = 0;
   return previous_;
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_X64