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

src/ic/x87/handler-compiler-x87.cc

 // Copyright 2012 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_X87
 
 #include "src/ic/handler-compiler.h"
 
 #include "src/api-arguments.h"
 #include "src/field-type.h"
@@ skipping 393 matching lines @@
   DCHECK(!value_reg.is(scratch));
   __ JumpIfSmi(value_reg, miss_label);
   if (field_type->IsClass()) {
     __ mov(map_reg, FieldOperand(value_reg, HeapObject::kMapOffset));
     __ CmpWeakValue(map_reg, Map::WeakCellForMap(field_type->AsClass()),
                     scratch);
     __ j(not_equal, miss_label);
   }
 }
 
+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.
+  __ mov(scratch1, NativeContextOperand());
+  // Load expected native context.
+  __ LoadWeakValue(scratch2, native_context_cell, miss);
+  __ cmp(scratch1, scratch2);
+
+  if (!compare_native_contexts_only) {
+    __ j(equal, &done);
+
+    // Compare security tokens of current and expected native contexts.
+    __ mov(scratch1, ContextOperand(scratch1, Context::SECURITY_TOKEN_INDEX));
+    __ mov(scratch2, ContextOperand(scratch2, Context::SECURITY_TOKEN_INDEX));
+    __ cmp(scratch1, scratch2);
+  }
+  __ j(not_equal, miss);
+
+  __ 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 264 matching lines @@
   // Return the generated code.
   return GetCode(kind(), name);
 }
 
 
 #undef __
 }  // namespace internal
 }  // namespace v8
 
 #endif  // V8_TARGET_ARCH_X87