[ic] Resurrect access checks for primitive and global proxy receivers.

src/ic/mips/handler-compiler-mips.cc

 // Copyright 2014 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_MIPS
 
 #include "src/ic/handler-compiler.h"
 
 #include "src/api-arguments.h"
 #include "src/field-type.h"
@@ skipping 375 matching lines @@
   DCHECK(!value_reg.is(scratch));
   __ JumpIfSmi(value_reg, miss_label);
   if (field_type->IsClass()) {
     __ lw(map_reg, FieldMemOperand(value_reg, HeapObject::kMapOffset));
     // Compare map directly within the Branch() functions.
     __ GetWeakValue(scratch, Map::WeakCellForMap(field_type->AsClass()));
     __ Branch(miss_label, ne, map_reg, Operand(scratch));
   }
 }
 
+void PropertyHandlerCompiler::GenerateAccessCheck(
+    Handle<WeakCell> native_context_cell, Register scratch1, Register scratch2,
+    Label* miss, bool compare_native_contexts_only) {
+  Label done;
+  // Load current native context.
+  __ lw(scratch1, NativeContextMemOperand());
+  // Load expected native context.
+  __ LoadWeakValue(scratch2, native_context_cell, miss);
+
+  if (!compare_native_contexts_only) {
+    __ Branch(&done, eq, scratch1, Operand(scratch2));
+
+    // Compare security tokens of current and expected native contexts.
+    __ lw(scratch1, ContextMemOperand(scratch1, Context::SECURITY_TOKEN_INDEX));
+    __ lw(scratch2, ContextMemOperand(scratch2, Context::SECURITY_TOKEN_INDEX));
+  }
+  __ Branch(miss, ne, scratch1, Operand(scratch2));
+
+  __ bind(&done);
+}
+
 Register PropertyHandlerCompiler::CheckPrototypes(
     Register object_reg, Register holder_reg, Register scratch1,
     Register scratch2, Handle<Name> name, Label* miss,
     ReturnHolder return_what) {
   Handle<Map> receiver_map = map();
 
   // Make sure there's no overlap between holder and object registers.
   DCHECK(!scratch1.is(object_reg) && !scratch1.is(holder_reg));
   DCHECK(!scratch2.is(object_reg) && !scratch2.is(holder_reg) &&
          !scratch2.is(scratch1));
@@ skipping 240 matching lines @@
   // Return the generated code.
   return GetCode(kind(), name);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_MIPS