MIPS: Track storage types of instance variables.

src/mips/stub-cache-mips.cc

Index: src/mips/stub-cache-mips.cc
diff --git a/src/mips/stub-cache-mips.cc b/src/mips/stub-cache-mips.cc
index e110c47c6f12a7d46ae04f094b21e75ff4af4844..aeb26ee9ac0dea3757fdfc7499e817346fb69999 100644
--- a/src/mips/stub-cache-mips.cc
+++ b/src/mips/stub-cache-mips.cc
@@ -456,6 +456,25 @@ void StubCompiler::GenerateStoreTransition(MacroAssembler* masm,
     __ 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;
@@ -537,18 +556,20 @@ void StubCompiler::GenerateStoreTransition(MacroAssembler* masm,
     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);
-
-    // 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);
+    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);
+    }
   } else {
     // Write to the properties array.
     int offset = index * kPointerSize + FixedArray::kHeaderSize;
@@ -557,18 +578,20 @@ void StubCompiler::GenerateStoreTransition(MacroAssembler* masm,
           FieldMemOperand(receiver_reg, JSObject::kPropertiesOffset));
     __ sw(value_reg, FieldMemOperand(scratch1, offset));
 
-    // 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);
+    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);
+    }
   }
 
   // Return the value (register v0).
@@ -615,24 +638,38 @@ void StubCompiler::GenerateStoreField(MacroAssembler* masm,
   // 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);
-
-    // 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);
+    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);
+    }
   } else {
     // Write to the properties array.
     int offset = index * kPointerSize + FixedArray::kHeaderSize;
@@ -641,18 +678,20 @@ void StubCompiler::GenerateStoreField(MacroAssembler* masm,
           FieldMemOperand(receiver_reg, JSObject::kPropertiesOffset));
     __ sw(value_reg, FieldMemOperand(scratch1, offset));
 
-    // 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);
+    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);
+    }
   }
 
   // Return the value (register v0).
@@ -2935,18 +2974,24 @@ Handle<Code> BaseLoadStubCompiler::CompilePolymorphicIC(
   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);
 }