Introduce LanguageMode, drop StrictMode.

src/arm/full-codegen-arm.cc

Index: src/arm/full-codegen-arm.cc
diff --git a/src/arm/full-codegen-arm.cc b/src/arm/full-codegen-arm.cc
index effbac6dfb3e9333da12ab49469235d7312b3148..f82d506f9ee9538dfebb0605c14771b937c80d12 100644
--- a/src/arm/full-codegen-arm.cc
+++ b/src/arm/full-codegen-arm.cc
@@ -126,7 +126,7 @@ 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() * kPointerSize;
     __ ldr(r2, MemOperand(sp, receiver_offset));
@@ -263,7 +263,7 @@ void FullCodeGenerator::Generate() {
     // The stub will rewrite receiever 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;
@@ -1300,7 +1300,7 @@ 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(r2, Operand(info));
     __ CallStub(&stub);
   } else {
@@ -2662,7 +2662,7 @@ void FullCodeGenerator::EmitAssignment(Expression* expr) {
       __ Pop(StoreDescriptor::ValueRegister(),
              StoreDescriptor::ReceiverRegister());
       Handle<Code> ic =
-          CodeFactory::KeyedStoreIC(isolate(), strict_mode()).code();
+          CodeFactory::KeyedStoreIC(isolate(), language_mode()).code();
       CallIC(ic);
       break;
     }
@@ -2731,8 +2731,8 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op) {
       // Assignment to var.
       __ push(r0);  // Value.
       __ mov(r1, Operand(var->name()));
-      __ mov(r0, Operand(Smi::FromInt(strict_mode())));
-      __ Push(cp, r1, r0);  // Context, name, strict mode.
+      __ mov(r0, Operand(Smi::FromInt(language_mode())));
+      __ Push(cp, r1, r0);  // Context, name, language mode.
       __ CallRuntime(Runtime::kStoreLookupSlot, 4);
     } else {
       // Assignment to var or initializing assignment to let/const in harmony
@@ -2747,7 +2747,7 @@ void FullCodeGenerator::EmitVariableAssignment(Variable* var, Token::Value op) {
       }
       EmitStoreToStackLocalOrContextSlot(var, location);
     }
-  } else if (IsSignallingAssignmentToConst(var, op, strict_mode())) {
+  } else if (IsSignallingAssignmentToConst(var, op, language_mode())) {
     __ CallRuntime(Runtime::kThrowConstAssignError, 0);
   }
 }
@@ -2781,8 +2781,8 @@ void FullCodeGenerator::EmitNamedSuperPropertyStore(Property* prop) {
 
   __ Push(key->value());
   __ Push(r0);
-  __ CallRuntime((strict_mode() == STRICT ? Runtime::kStoreToSuper_Strict
-                                          : Runtime::kStoreToSuper_Sloppy),
+  __ CallRuntime((is_strict(language_mode()) ? Runtime::kStoreToSuper_Strict
+                                             : Runtime::kStoreToSuper_Sloppy),
                  4);
 }
 
@@ -2794,9 +2794,10 @@ void FullCodeGenerator::EmitKeyedSuperPropertyStore(Property* prop) {
   DCHECK(prop != NULL);
 
   __ Push(r0);
-  __ CallRuntime((strict_mode() == STRICT ? Runtime::kStoreKeyedToSuper_Strict
-                                          : Runtime::kStoreKeyedToSuper_Sloppy),
-                 4);
+  __ CallRuntime(
+      (is_strict(language_mode()) ? Runtime::kStoreKeyedToSuper_Strict
+                                  : Runtime::kStoreKeyedToSuper_Sloppy),
+      4);
 }
 
 
@@ -2808,7 +2809,8 @@ void FullCodeGenerator::EmitKeyedPropertyAssignment(Assignment* expr) {
   __ Pop(StoreDescriptor::ReceiverRegister(), StoreDescriptor::NameRegister());
   DCHECK(StoreDescriptor::ValueRegister().is(r0));
 
-  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);
@@ -3035,8 +3037,8 @@ void FullCodeGenerator::EmitResolvePossiblyDirectEval(int arg_count) {
   int receiver_offset = 2 + info_->scope()->num_parameters();
   __ ldr(r3, MemOperand(fp, receiver_offset * kPointerSize));
 
-  // r2: strict mode.
-  __ mov(r2, Operand(Smi::FromInt(strict_mode())));
+  // r2: language mode.
+  __ mov(r2, Operand(Smi::FromInt(language_mode())));
 
   // r1: the start position of the scope the calls resides in.
   __ mov(r1, Operand(Smi::FromInt(scope()->start_position())));
@@ -4571,7 +4573,7 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
       if (property != NULL) {
         VisitForStackValue(property->obj());
         VisitForStackValue(property->key());
-        __ mov(r1, Operand(Smi::FromInt(strict_mode())));
+        __ mov(r1, Operand(Smi::FromInt(language_mode())));
         __ push(r1);
         __ InvokeBuiltin(Builtins::DELETE, CALL_FUNCTION);
         context()->Plug(r0);
@@ -4579,7 +4581,7 @@ 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(r2, GlobalObjectOperand());
           __ mov(r1, Operand(var->name()));
@@ -4900,7 +4902,7 @@ void FullCodeGenerator::VisitCountOperation(CountOperation* expr) {
       __ Pop(StoreDescriptor::ReceiverRegister(),
              StoreDescriptor::NameRegister());
       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()) {