Add script context with context-allocated "const this"

src/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.
 
 #include "src/v8.h"
 
 #if V8_TARGET_ARCH_ARM64
 
 #include "src/code-factory.h"
 #include "src/code-stubs.h"
@@ skipping 2781 matching lines @@
   ASM_LOCATION("FullCodeGenerator::EmitResolvePossiblyDirectEval");
   // Prepare to push a copy of the first argument or undefined if it doesn't
   // exist.
   if (arg_count > 0) {
     __ Peek(x9, arg_count * kXRegSize);
   } else {
     __ LoadRoot(x9, Heap::kUndefinedValueRootIndex);
   }
 
   __ Ldr(x10, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
-  // Prepare to push the receiver of the enclosing function.
-  Variable* this_var = scope()->LookupThis();
-  DCHECK_NOT_NULL(this_var);
-  __ Ldr(x11, VarOperand(this_var, x11));
 
   // Prepare to push the language mode.
-  __ Mov(x12, Smi::FromInt(language_mode()));
+  __ Mov(x11, Smi::FromInt(language_mode()));
   // Prepare to push the start position of the scope the calls resides in.
-  __ Mov(x13, Smi::FromInt(scope()->start_position()));
+  __ Mov(x12, Smi::FromInt(scope()->start_position()));
 
   // Push.
-  __ Push(x9, x10, x11, x12, x13);
+  __ Push(x9, x10, x11, x12);
 
   // Do the runtime call.
-  __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 6);
+  __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 5);
 }
 
 
 void FullCodeGenerator::EmitInitializeThisAfterSuper(
     SuperCallReference* super_ref, FeedbackVectorICSlot slot) {
   Variable* this_var = super_ref->this_var()->var();
   GetVar(x1, this_var);
   Label uninitialized_this;
   __ JumpIfRoot(x1, Heap::kTheHoleValueRootIndex, &uninitialized_this);
   __ Mov(x0, Operand(this_var->name()));
@@ skipping 11 matching lines @@
   // through this function.  Avoid early returns.
   expr->return_is_recorded_ = false;
 #endif
 
   Comment cmnt(masm_, "[ Call");
   Expression* callee = expr->expression();
   Call::CallType call_type = expr->GetCallType(isolate());
 
   if (call_type == Call::POSSIBLY_EVAL_CALL) {
     // In a call to eval, we first call RuntimeHidden_ResolvePossiblyDirectEval
-    // to resolve the function we need to call and the receiver of the
-    // call.  Then we call the resolved function using the given
-    // arguments.
+    // to resolve the function we need to call.  Then we call the resolved
+    // function using the given arguments.
     ZoneList<Expression*>* args = expr->arguments();
     int arg_count = args->length();
 
     {
       PreservePositionScope pos_scope(masm()->positions_recorder());
       VisitForStackValue(callee);
       __ LoadRoot(x10, Heap::kUndefinedValueRootIndex);
       __ Push(x10);  // Reserved receiver slot.
 
       // Push the arguments.
       for (int i = 0; i < arg_count; i++) {
         VisitForStackValue(args->at(i));
       }
 
       // Push a copy of the function (found below the arguments) and
       // resolve eval.
       __ Peek(x10, (arg_count + 1) * kPointerSize);
       __ Push(x10);
       EmitResolvePossiblyDirectEval(arg_count);
 
-      // The runtime call returns a pair of values in x0 (function) and
-      // x1 (receiver). Touch up the stack with the right values.
-      __ PokePair(x1, x0, arg_count * kPointerSize);
+      // Touch up the stack with the resolved function.
+      __ Poke(x0, (arg_count + 1) * kPointerSize);
 
       PrepareForBailoutForId(expr->EvalOrLookupId(), NO_REGISTERS);
     }
 
     // Record source position for debugger.
     SetSourcePosition(expr->position());
 
     // Call the evaluated function.
     CallFunctionStub stub(isolate(), arg_count, NO_CALL_FUNCTION_FLAGS);
     __ Peek(x1, (arg_count + 1) * kXRegSize);
@@ skipping 1573 matching lines @@
 
       if (property != NULL) {
         VisitForStackValue(property->obj());
         VisitForStackValue(property->key());
         __ Mov(x10, Smi::FromInt(language_mode()));
         __ Push(x10);
         __ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION);
         context()->Plug(x0);
       } else if (proxy != NULL) {
         Variable* var = proxy->var();
-        // Delete of an unqualified identifier is disallowed in strict mode
-        // but "delete this" is allowed.
-        DCHECK(is_sloppy(language_mode()) || var->is_this());
+        // Delete of an unqualified identifier is disallowed in strict mode but
+        // "delete this" is allowed.
+        bool is_this = var->HasThisName(isolate());
+        DCHECK(is_sloppy(language_mode()) || is_this);
         if (var->IsUnallocated()) {
           __ Ldr(x12, GlobalObjectMemOperand());
           __ Mov(x11, Operand(var->name()));
           __ Mov(x10, Smi::FromInt(SLOPPY));
           __ Push(x12, x11, x10);
           __ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION);
           context()->Plug(x0);
         } else if (var->IsStackAllocated() || var->IsContextSlot()) {
           // Result of deleting non-global, non-dynamic variables is false.
           // The subexpression does not have side effects.
-          context()->Plug(var->is_this());
+          context()->Plug(is_this);
         } else {
           // Non-global variable.  Call the runtime to try to delete from the
           // context where the variable was introduced.
           __ Mov(x2, Operand(var->name()));
           __ Push(context_register(), x2);
           __ CallRuntime(Runtime::kDeleteLookupSlot, 2);
           context()->Plug(x0);
         }
       } else {
         // Result of deleting non-property, non-variable reference is true.
@@ skipping 1077 matching lines @@
   }
 
   return INTERRUPT;
 }
 
 
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_ARM64