Introduce LanguageMode, drop StrictMode.

src/arm64/full-codegen-arm64.cc

Index: src/arm64/full-codegen-arm64.cc
diff --git a/src/arm64/full-codegen-arm64.cc b/src/arm64/full-codegen-arm64.cc
index 3841838595a44e6f3f159f71a3503d57b82a7502..8c7fb5d0abb8649c788987ac36d7cc47cb18e6fe 100644
--- a/src/arm64/full-codegen-arm64.cc
+++ b/src/arm64/full-codegen-arm64.cc
@@ -124,7 +124,7 @@ void FullCodeGenerator::Generate() {
   // Sloppy mode functions and builtins need to replace the receiver with the
   // global proxy when called as functions (without an explicit receiver
   // object).
-  if (info->strict_mode() == SLOPPY && !info->is_native()) {
+  if (is_sloppy(info->language_mode()) && !info->is_native()) {
     Label ok;
     int receiver_offset = info->scope()->num_parameters() * kXRegSize;
     __ Peek(x10, receiver_offset);
@@ -263,7 +263,7 @@ void FullCodeGenerator::Generate() {
     // The stub will rewrite receiver and parameter count if the previous
     // stack frame was an arguments adapter frame.
     ArgumentsAccessStub::Type type;
-    if (strict_mode() == STRICT) {
+    if (is_strict(language_mode())) {
       type = ArgumentsAccessStub::NEW_STRICT;
     } else if (function()->has_duplicate_parameters()) {
       type = ArgumentsAccessStub::NEW_SLOPPY_SLOW;
@@ -1288,7 +1288,7 @@ void FullCodeGenerator::EmitNewClosure(Handle<SharedFunctionInfo> info,
       !pretenure &&
       scope()->is_function_scope() &&
       info->num_literals() == 0) {
-    FastNewClosureStub stub(isolate(), info->strict_mode(), info->kind());
+    FastNewClosureStub stub(isolate(), info->language_mode(), info->kind());
     __ Mov(x2, Operand(info));
     __ CallStub(&stub);
   } else {
@@ -1721,7 +1721,7 @@ void FullCodeGenerator::VisitObjectLiteral(ObjectLiteral* expr) {
           VisitForStackValue(key);
           VisitForStackValue(value);
           EmitSetHomeObjectIfNeeded(value, 2);
-          __ Mov(x0, Smi::FromInt(SLOPPY));  // Strict mode
+          __ Mov(x0, Smi::FromInt(SLOPPY));  // Language mode
           __ Push(x0);
           __ CallRuntime(Runtime::kSetProperty, 4);
         } else {
@@ -2349,7 +2349,7 @@ void FullCodeGenerator::EmitAssignment(Expression* expr) {
       __ Pop(StoreDescriptor::ReceiverRegister(),
              StoreDescriptor::ValueRegister());
       Handle<Code> ic =
-          CodeFactory::KeyedStoreIC(isolate(), strict_mode()).code();
+          CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
       CallIC(ic);
       break;
     }
@@ -2416,7 +2416,7 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
     if (var->IsLookupSlot()) {
       // Assignment to var.
       __ Mov(x11, Operand(var->name()));
-      __ Mov(x10, Smi::FromInt(strict_mode()));
+      __ Mov(x10, Smi::FromInt(language_mode()));
       // jssp[0]  : mode.
       // jssp[8]  : name.
       // jssp[16] : context.
@@ -2435,7 +2435,7 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var,
       }
       EmitStoreToStackLocalOrContextSlot(var, location);
     }
-  } else if (IsSignallingAssignmentToConst(var, op, strict_mode())) {
+  } else if (IsSignallingAssignmentToConst(var, op, language_mode())) {
     __ CallRuntime(Runtime::kThrowConstAssignError, 0);
   }
 }
@@ -2470,8 +2470,8 @@ void FullCodeGenerator::EmitNamedSuperPropertyStore(Property* prop) {
 
   __ Push(key->value());
   __ Push(x0);
-  __ CallRuntime((strict_mode() == STRICT ? Runtime::kStoreToSuper_Strict
-                                          : Runtime::kStoreToSuper_Sloppy),
+  __ CallRuntime((is_strict(language_mode()) ? Runtime::kStoreToSuper_Strict
+                                             : Runtime::kStoreToSuper_Sloppy),
                  4);
 }
 
@@ -2483,9 +2483,10 @@ void FullCodeGenerator::EmitKeyedSuperPropertyStore(Property* prop) {
   DCHECK(prop != NULL);
 
   __ Push(x0);
-  __ CallRuntime((strict_mode() == STRICT ? Runtime::kStoreKeyedToSuper_Strict
-                                          : Runtime::kStoreKeyedToSuper_Sloppy),
-                 4);
+  __ CallRuntime(
+      (is_strict(language_mode()) ? Runtime::kStoreKeyedToSuper_Strict
+                                  : Runtime::kStoreKeyedToSuper_Sloppy),
+      4);
 }
 
 
@@ -2499,7 +2500,8 @@ void FullCodeGenerator::EmitKeyedPropertyAssignment(Assignment* expr) {
   __ Pop(StoreDescriptor::NameRegister(), StoreDescriptor::ReceiverRegister());
   DCHECK(StoreDescriptor::ValueRegister().is(x0));
 
-  Handle<Code> ic = CodeFactory::KeyedStoreIC(isolate(), strict_mode()).code();
+  Handle<Code> ic =
+      CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
   CallIC(ic, expr->AssignmentFeedbackId());
 
   PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
@@ -2724,7 +2726,7 @@ void FullCodeGenerator::EmitResolvePossiblyDirectEval(int arg_count) {
   __ Ldr(x11, MemOperand(fp, receiver_offset * kPointerSize));
 
   // Prepare to push the language mode.
-  __ Mov(x12, Smi::FromInt(strict_mode()));
+  __ Mov(x12, Smi::FromInt(language_mode()));
   // Prepare to push the start position of the scope the calls resides in.
   __ Mov(x13, Smi::FromInt(scope()->start_position()));
 
@@ -4258,7 +4260,7 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
       if (property != NULL) {
         VisitForStackValue(property->obj());
         VisitForStackValue(property->key());
-        __ Mov(x10, Smi::FromInt(strict_mode()));
+        __ Mov(x10, Smi::FromInt(language_mode()));
         __ Push(x10);
         __ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION);
         context()->Plug(x0);
@@ -4266,7 +4268,7 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
         Variable* var = proxy->var();
         // Delete of an unqualified identifier is disallowed in strict mode
         // but "delete this" is allowed.
-        DCHECK(strict_mode() == SLOPPY || var->is_this());
+        DCHECK(is_sloppy(language_mode()) || var->is_this());
         if (var->IsUnallocated()) {
           __ Ldr(x12, GlobalObjectMemOperand());
           __ Mov(x11, Operand(var->name()));
@@ -4585,7 +4587,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
       __ Pop(StoreDescriptor::NameRegister());
       __ Pop(StoreDescriptor::ReceiverRegister());
       Handle<Code> ic =
-          CodeFactory::KeyedStoreIC(isolate(), strict_mode()).code();
+          CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
       CallIC(ic, expr->CountStoreFeedbackId());
       PrepareForBailoutForId(expr->AssignmentId(), TOS_REG);
       if (expr->is_postfix()) {