[runtime] Introduce FastNewStrictArgumentsStub to optimize strict arguments.

src/full-codegen/arm64/full-codegen-arm64.cc

 // Copyright 2013 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.
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/ast/scopes.h"
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
@@ skipping 256 matching lines @@
     FastNewRestParameterStub stub(isolate());
     __ CallStub(&stub);
     function_in_register_x1 = false;
     SetVar(rest_param, x0, x1, x2);
   }
 
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Function uses arguments object.
     Comment cmnt(masm_, "[ Allocate arguments object");
-    DCHECK(x1.is(ArgumentsAccessNewDescriptor::function()));
     if (!function_in_register_x1) {
       // Load this again, if it's used by the local context below.
       __ Ldr(x1, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
     }
-    // Receiver is just before the parameters on the caller's stack.
-    int num_parameters = info->scope()->num_parameters();
-    int offset = num_parameters * kPointerSize;
-    __ Mov(ArgumentsAccessNewDescriptor::parameter_count(),
-           Smi::FromInt(num_parameters));
-    __ Add(ArgumentsAccessNewDescriptor::parameter_pointer(), fp,
-           StandardFrameConstants::kCallerSPOffset + offset);
+    if (is_strict(language_mode()) || !has_simple_parameters()) {
+      FastNewStrictArgumentsStub stub(isolate());
+      __ CallStub(&stub);
+    } else {
+      DCHECK(x1.is(ArgumentsAccessNewDescriptor::function()));
+      // Receiver is just before the parameters on the caller's stack.
+      int num_parameters = info->scope()->num_parameters();
+      int offset = num_parameters * kPointerSize;
+      __ Mov(ArgumentsAccessNewDescriptor::parameter_count(),
+             Smi::FromInt(num_parameters));
+      __ Add(ArgumentsAccessNewDescriptor::parameter_pointer(), fp,
+             StandardFrameConstants::kCallerSPOffset + offset);
 
-    // Arguments to ArgumentsAccessStub:
-    //   function, parameter pointer, parameter count.
-    // The stub will rewrite parameter pointer and parameter count if the
-    // previous stack frame was an arguments adapter frame.
-    bool is_unmapped = is_strict(language_mode()) || !has_simple_parameters();
-    ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
-        is_unmapped, literal()->has_duplicate_parameters());
-    ArgumentsAccessStub stub(isolate(), type);
-    __ CallStub(&stub);
+      // Arguments to ArgumentsAccessStub:
+      //   function, parameter pointer, parameter count.
+      // The stub will rewrite parameter pointer and parameter count if the
+      // previous stack frame was an arguments adapter frame.
+      ArgumentsAccessStub::Type type = ArgumentsAccessStub::ComputeType(
+          literal()->has_duplicate_parameters());
+      ArgumentsAccessStub stub(isolate(), type);
+      __ CallStub(&stub);
+    }
 
     SetVar(arguments, x0, x1, x2);
   }
 
   if (FLAG_trace) {
     __ CallRuntime(Runtime::kTraceEnter);
   }
 
   // Visit the declarations and body unless there is an illegal
   // redeclaration.
@@ skipping 4381 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64