Add script context with context-allocated "const this"

src/mips/full-codegen-mips.cc

Index: src/mips/full-codegen-mips.cc
diff --git a/src/mips/full-codegen-mips.cc b/src/mips/full-codegen-mips.cc
index b7d161193c6ff1ecc693edcf0f1d700a7c5254d5..2440f9838362534dd70a472b133c2670b92824a7 100644
--- a/src/mips/full-codegen-mips.cc
+++ b/src/mips/full-codegen-mips.cc
@@ -3089,21 +3089,15 @@ void FullCodeGenerator::EmitResolvePossiblyDirectEval(int arg_count) {
   // t2: the receiver of the enclosing function.
   __ lw(t2, MemOperand(fp, JavaScriptFrameConstants::kFunctionOffset));
 
-  // t1: the receiver of the enclosing function.
-  Variable* this_var = scope()->LookupThis();
-  DCHECK_NOT_NULL(this_var);
-  __ lw(t1, VarOperand(this_var, t1));
+  // t1: the language mode.
+  __ li(t1, Operand(Smi::FromInt(language_mode())));
 
-  // t0: the language mode.
-  __ li(t0, Operand(Smi::FromInt(language_mode())));
-
-  // a1: the start position of the scope the calls resides in.
-  __ li(a1, Operand(Smi::FromInt(scope()->start_position())));
+  // t0: the start position of the scope the calls resides in.
+  __ li(t0, Operand(Smi::FromInt(scope()->start_position())));
 
   // Do the runtime call.
-  __ Push(t3);
-  __ Push(t2, t1, t0, a1);
-  __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 6);
+  __ Push(t3, t2, t1, t0);
+  __ CallRuntime(Runtime::kResolvePossiblyDirectEval, 5);
 }
 
 
@@ -3136,9 +3130,8 @@ void FullCodeGenerator::VisitCall(Call* expr) {
 
   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();
 
@@ -3158,10 +3151,8 @@ void FullCodeGenerator::VisitCall(Call* expr) {
       __ push(a1);
       EmitResolvePossiblyDirectEval(arg_count);
 
-      // The runtime call returns a pair of values in v0 (function) and
-      // v1 (receiver). Touch up the stack with the right values.
+      // Touch up the stack with the resolved function.
       __ sw(v0, MemOperand(sp, (arg_count + 1) * kPointerSize));
-      __ sw(v1, MemOperand(sp, arg_count * kPointerSize));
 
       PrepareForBailoutForId(expr->EvalOrLookupId(), NO_REGISTERS);
     }
@@ -4790,9 +4781,10 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
         context()->Plug(v0);
       } 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()) {
           __ lw(a2, GlobalObjectOperand());
           __ li(a1, Operand(var->name()));
@@ -4803,7 +4795,7 @@ void FullCodeGenerator::VisitUnaryOperation(UnaryOperation* expr) {
         } 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.