MIPS: Track storage types of instance variables.

src/mips/stub-cache-mips.cc

 // Copyright 2012 the V8 project authors. All rights reserved.
 // Redistribution and use in source and binary forms, with or without
 // modification, are permitted provided that the following conditions are
 // met:
 //
 //     * Redistributions of source code must retain the above copyright
 //       notice, this list of conditions and the following disclaimer.
 //     * Redistributions in binary form must reproduce the above
 //       copyright notice, this list of conditions and the following
 //       disclaimer in the documentation and/or other materials provided
@@ skipping 438 matching lines @@
 
   // Check that the map of the object hasn't changed.
   __ CheckMap(receiver_reg, scratch1, Handle<Map>(object->map()), miss_label,
               DO_SMI_CHECK, REQUIRE_EXACT_MAP);
 
   // Perform global security token check if needed.
   if (object->IsJSGlobalProxy()) {
     __ CheckAccessGlobalProxy(receiver_reg, scratch1, miss_label);
   }
 
+  int descriptor = transition->LastAdded();
+  DescriptorArray* descriptors = transition->instance_descriptors();
+  PropertyDetails details = descriptors->GetDetails(descriptor);
+  Representation representation = details.representation();
+  ASSERT(!representation.IsNone());
+
+  // Ensure no transitions to deprecated maps are followed.
+  __ CheckMapDeprecated(transition, scratch1, miss_label);
+
+  if (FLAG_track_fields && representation.IsSmi()) {
+    __ JumpIfNotSmi(value_reg, miss_label);
+  } else if (FLAG_track_double_fields && representation.IsDouble()) {
+    Label do_store;
+    __ JumpIfSmi(value_reg, &do_store);
+    __ CheckMap(value_reg, scratch1, Heap::kHeapNumberMapRootIndex,
+                miss_label, DONT_DO_SMI_CHECK);
+    __ bind(&do_store);
+  }
+
   // Check that we are allowed to write this.
   if (object->GetPrototype()->IsJSObject()) {
     JSObject* holder;
     // holder == object indicates that no property was found.
     if (lookup->holder() != *object) {
       holder = lookup->holder();
     } else {
       // Find the top object.
       holder = *object;
       do {
@@ skipping 61 matching lines @@
   // face of a transition we can use the old map here because the size of the
   // object and the number of in-object properties is not going to change.
   index -= object->map()->inobject_properties();
 
   // TODO(verwaest): Share this code as a code stub.
   if (index < 0) {
     // Set the property straight into the object.
     int offset = object->map()->instance_size() + (index * kPointerSize);
     __ sw(value_reg, FieldMemOperand(receiver_reg, offset));
 
-    // Skip updating write barrier if storing a smi.
-    __ JumpIfSmi(value_reg, &exit);
+    if (!FLAG_track_fields || !representation.IsSmi()) {
+      // Skip updating write barrier if storing a smi.
+      __ JumpIfSmi(value_reg, &exit);
 
-    // Update the write barrier for the array address.
-    // Pass the now unused name_reg as a scratch register.
-    __ mov(name_reg, value_reg);
-    __ RecordWriteField(receiver_reg,
-                        offset,
-                        name_reg,
-                        scratch1,
-                        kRAHasNotBeenSaved,
-                        kDontSaveFPRegs);
+      // Update the write barrier for the array address.
+      // Pass the now unused name_reg as a scratch register.
+      __ mov(name_reg, value_reg);
+      __ RecordWriteField(receiver_reg,
+                          offset,
+                          name_reg,
+                          scratch1,
+                          kRAHasNotBeenSaved,
+                          kDontSaveFPRegs);
+    }
   } else {
     // Write to the properties array.
     int offset = index * kPointerSize + FixedArray::kHeaderSize;
     // Get the properties array
     __ lw(scratch1,
           FieldMemOperand(receiver_reg, JSObject::kPropertiesOffset));
     __ sw(value_reg, FieldMemOperand(scratch1, offset));
 
-    // Skip updating write barrier if storing a smi.
-    __ JumpIfSmi(value_reg, &exit);
+    if (!FLAG_track_fields || !representation.IsSmi()) {
+      // Skip updating write barrier if storing a smi.
+      __ JumpIfSmi(value_reg, &exit);
 
-    // Update the write barrier for the array address.
-    // Ok to clobber receiver_reg and name_reg, since we return.
-    __ mov(name_reg, value_reg);
-    __ RecordWriteField(scratch1,
-                        offset,
-                        name_reg,
-                        receiver_reg,
-                        kRAHasNotBeenSaved,
-                        kDontSaveFPRegs);
+      // Update the write barrier for the array address.
+      // Ok to clobber receiver_reg and name_reg, since we return.
+      __ mov(name_reg, value_reg);
+      __ RecordWriteField(scratch1,
+                          offset,
+                          name_reg,
+                          receiver_reg,
+                          kRAHasNotBeenSaved,
+                          kDontSaveFPRegs);
+    }
   }
 
   // Return the value (register v0).
   ASSERT(value_reg.is(a0));
   __ bind(&exit);
   __ mov(v0, a0);
   __ Ret();
 }
 
 
@@ skipping 26 matching lines @@
   // checks.
   ASSERT(object->IsJSGlobalProxy() || !object->IsAccessCheckNeeded());
 
   int index = lookup->GetFieldIndex().field_index();
 
   // Adjust for the number of properties stored in the object. Even in the
   // face of a transition we can use the old map here because the size of the
   // object and the number of in-object properties is not going to change.
   index -= object->map()->inobject_properties();
 
+  Representation representation = lookup->representation();
+  ASSERT(!representation.IsNone());
+  if (FLAG_track_fields && representation.IsSmi()) {
+    __ JumpIfNotSmi(value_reg, miss_label);
+  } else if (FLAG_track_double_fields && representation.IsDouble()) {
+    Label do_store;
+    __ JumpIfSmi(value_reg, &do_store);
+    __ CheckMap(value_reg, scratch1, Heap::kHeapNumberMapRootIndex,
+                miss_label, DONT_DO_SMI_CHECK);
+    __ bind(&do_store);
+  }
+
   // TODO(verwaest): Share this code as a code stub.
   if (index < 0) {
     // Set the property straight into the object.
     int offset = object->map()->instance_size() + (index * kPointerSize);
     __ sw(value_reg, FieldMemOperand(receiver_reg, offset));
 
-    // Skip updating write barrier if storing a smi.
-    __ JumpIfSmi(value_reg, &exit);
+    if (!FLAG_track_fields || !representation.IsSmi()) {
+      // Skip updating write barrier if storing a smi.
+      __ JumpIfSmi(value_reg, &exit);
 
-    // Update the write barrier for the array address.
-    // Pass the now unused name_reg as a scratch register.
-    __ mov(name_reg, value_reg);
-    __ RecordWriteField(receiver_reg,
-                        offset,
-                        name_reg,
-                        scratch1,
-                        kRAHasNotBeenSaved,
-                        kDontSaveFPRegs);
+      // Update the write barrier for the array address.
+      // Pass the now unused name_reg as a scratch register.
+      __ mov(name_reg, value_reg);
+      __ RecordWriteField(receiver_reg,
+                          offset,
+                          name_reg,
+                          scratch1,
+                          kRAHasNotBeenSaved,
+                          kDontSaveFPRegs);
+    }
   } else {
     // Write to the properties array.
     int offset = index * kPointerSize + FixedArray::kHeaderSize;
     // Get the properties array.
     __ lw(scratch1,
           FieldMemOperand(receiver_reg, JSObject::kPropertiesOffset));
     __ sw(value_reg, FieldMemOperand(scratch1, offset));
 
-    // Skip updating write barrier if storing a smi.
-    __ JumpIfSmi(value_reg, &exit);
+    if (!FLAG_track_fields || !representation.IsSmi()) {
+      // Skip updating write barrier if storing a smi.
+      __ JumpIfSmi(value_reg, &exit);
 
-    // Update the write barrier for the array address.
-    // Ok to clobber receiver_reg and name_reg, since we return.
-    __ mov(name_reg, value_reg);
-    __ RecordWriteField(scratch1,
-                        offset,
-                        name_reg,
-                        receiver_reg,
-                        kRAHasNotBeenSaved,
-                        kDontSaveFPRegs);
+      // Update the write barrier for the array address.
+      // Ok to clobber receiver_reg and name_reg, since we return.
+      __ mov(name_reg, value_reg);
+      __ RecordWriteField(scratch1,
+                          offset,
+                          name_reg,
+                          receiver_reg,
+                          kRAHasNotBeenSaved,
+                          kDontSaveFPRegs);
+    }
   }
 
   // Return the value (register v0).
   ASSERT(value_reg.is(a0));
   __ bind(&exit);
   __ mov(v0, a0);
   __ Ret();
 }
 
 
@@ skipping 2262 matching lines @@
   Label miss;
 
   if (check == PROPERTY) {
     GenerateNameCheck(name, this->name(), &miss);
   }
 
   __ JumpIfSmi(receiver(), &miss);
   Register map_reg = scratch1();
 
   int receiver_count = receiver_maps->length();
+  int number_of_handled_maps = 0;
   __ lw(map_reg, FieldMemOperand(receiver(), HeapObject::kMapOffset));
   for (int current = 0; current < receiver_count; ++current) {
-    __ Jump(handlers->at(current), RelocInfo::CODE_TARGET,
-        eq, map_reg, Operand(receiver_maps->at(current)));
+    Handle<Map> map = receiver_maps->at(current);
+    if (!map->is_deprecated()) {
+      number_of_handled_maps++;
+      __ Jump(handlers->at(current), RelocInfo::CODE_TARGET,
+          eq, map_reg, Operand(receiver_maps->at(current)));
+    }
   }
+  ASSERT(number_of_handled_maps != 0);
 
   __ bind(&miss);
   TailCallBuiltin(masm(), MissBuiltin(kind()));
 
   // Return the generated code.
   InlineCacheState state =
-      receiver_maps->length() > 1 ? POLYMORPHIC : MONOMORPHIC;
+      number_of_handled_maps > 1 ? POLYMORPHIC : MONOMORPHIC;
   return GetICCode(kind(), type, name, state);
 }
 
 
 Handle<Code> KeyedStoreStubCompiler::CompileStorePolymorphic(
     MapHandleList* receiver_maps,
     CodeHandleList* handler_stubs,
     MapHandleList* transitioned_maps) {
   Label miss;
   __ JumpIfSmi(receiver(), &miss);
@@ skipping 782 matching lines @@
     TailCallBuiltin(masm, Builtins::kKeyedStoreIC_Slow);
   }
 }
 
 
 #undef __
 
 } }  // namespace v8::internal
 
 #endif  // V8_TARGET_ARCH_MIPS