Crankshaft is now able to compile top level code even if there is a ScriptContext.

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/code-factory.h"
 #include "src/code-stubs.h"
 #include "src/codegen.h"
 #include "src/compiler.h"
@@ skipping 219 matching lines @@
         } else if (FLAG_debug_code) {
           Label done;
           __ JumpIfInNewSpace(cp, &done);
           __ Abort(kExpectedNewSpaceObject);
           __ bind(&done);
         }
       }
     }
   }
 
+  PrepareForBailoutForId(BailoutId::Prologue(), NO_REGISTERS);
+  // Function register is trashed in case we bailout here. But since that
+  // could happen only when we allocate a context the value of
+  // |function_in_register_x1| is correct.
+
   // Possibly set up a local binding to the this function which is used in
   // derived constructors with super calls.
   Variable* this_function_var = scope()->this_function_var();
   if (this_function_var != nullptr) {
     Comment cmnt(masm_, "[ This function");
     if (!function_in_register_x1) {
       __ Ldr(x1, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
-      // The write barrier clobbers register again, keep is marked as such.
+      // The write barrier clobbers register again, keep it marked as such.
     }
     SetVar(this_function_var, x1, x0, x2);
   }
 
   Variable* new_target_var = scope()->new_target_var();
   if (new_target_var != nullptr) {
     Comment cmnt(masm_, "[ new.target");
     // Get the frame pointer for the calling frame.
     __ Ldr(x2, MemOperand(fp, StandardFrameConstants::kCallerFPOffset));
 
     Label check_frame_marker;
     __ Ldr(x1, MemOperand(x2, StandardFrameConstants::kContextOffset));
     __ Cmp(x1, Smi::FromInt(StackFrame::ARGUMENTS_ADAPTOR));
     __ B(ne, &check_frame_marker);
     __ Ldr(x2, MemOperand(x2, StandardFrameConstants::kCallerFPOffset));
     __ Bind(&check_frame_marker);
     __ Ldr(x1, MemOperand(x2, StandardFrameConstants::kMarkerOffset));
     __ Cmp(x1, Smi::FromInt(StackFrame::CONSTRUCT));
+    function_in_register_x1 = false;
 
     Label non_construct_frame, done;
 
     __ B(ne, &non_construct_frame);
     __ Ldr(x0,
            MemOperand(x2, ConstructFrameConstants::kOriginalConstructorOffset));
     __ B(&done);
 
     __ Bind(&non_construct_frame);
     __ LoadRoot(x0, Heap::kUndefinedValueRootIndex);
@@ skipping 10 matching lines @@
     Comment cmnt(masm_, "[ Allocate rest parameter array");
 
     int num_parameters = info->scope()->num_parameters();
     int offset = num_parameters * kPointerSize;
 
     __ Add(x3, fp, StandardFrameConstants::kCallerSPOffset + offset);
     __ Mov(x2, Smi::FromInt(num_parameters));
     __ Mov(x1, Smi::FromInt(rest_index));
     __ Mov(x0, Smi::FromInt(language_mode()));
     __ Push(x3, x2, x1, x0);
+    function_in_register_x1 = false;
 
     RestParamAccessStub stub(isolate());
     __ CallStub(&stub);
 
     SetVar(rest_param, x0, x1, x2);
   }
 
   Variable* arguments = scope()->arguments();
   if (arguments != NULL) {
     // Function uses arguments object.
@@ skipping 5051 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64