First shot at static type propagation and type test elimination.

runtime/vm/intermediate_language.cc

Index: runtime/vm/intermediate_language.cc
===================================================================
--- runtime/vm/intermediate_language.cc	(revision 7707)
+++ runtime/vm/intermediate_language.cc	(working copy)
@@ -288,4 +288,251 @@
 }
 
 
+// ==== Support for propagating static type.
+RawAbstractType* ConstantVal::StaticType() const {
+  if (value().IsInstance()) {
+    Instance& instance = Instance::Handle();
+    instance ^= value().raw();
+    return instance.GetType();
+  } else {
+    UNREACHABLE();
+    return AbstractType::null();
+  }
+}
+
+
+RawAbstractType* UseVal::StaticType() const {
+  return definition()->StaticType();
+}
+
+
+RawAbstractType* AssertAssignableComp::StaticType() const {
+  return dst_type().raw();
+}
+
+
+RawAbstractType* AssertBooleanComp::StaticType() const {
+  return Type::BoolInterface();
+}
+
+
+RawAbstractType* CurrentContextComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* StoreContextComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* ClosureCallComp::StaticType() const {
+  // The closure is the first argument to the call.
+  const AbstractType& function_type =
+      AbstractType::Handle(ArgumentAt(0)->StaticType());
+  if (function_type.IsDynamicType() || function_type.IsFunctionInterface()) {
+    // The function type is not statically known or simply Function.
+    return Type::DynamicType();
+  }
+  const Class& signature_class = Class::Handle(function_type.type_class());
+  ASSERT(signature_class.IsSignatureClass());
+  const Function& signature_function =
+      Function::Handle(signature_class.signature_function());
+  // TODO(regis): The result type may be generic.
+  return signature_function.result_type();
+}
+
+
+RawAbstractType* InstanceCallComp::StaticType() const {
+  return Type::DynamicType();
+}
+
+
+RawAbstractType* StaticCallComp::StaticType() const {
+  return function().result_type();
+}
+
+
+RawAbstractType* LoadLocalComp::StaticType() const {
+  return local().type().raw();
+}
+
+
+RawAbstractType* StoreLocalComp::StaticType() const {
+  const AbstractType& assigned_value_type =
+      AbstractType::Handle(value()->StaticType());
+  if (assigned_value_type.IsDynamicType()) {
+    // Static type of assigned value is unknown, return static type of local.
+    return local().type().raw();
+  }
+  return assigned_value_type.raw();
+}
+
+
+RawAbstractType* StrictCompareComp::StaticType() const {
+  return Type::BoolInterface();
+}
+
+
+RawAbstractType* EqualityCompareComp::StaticType() const {
+  return Type::BoolInterface();
+}
+
+
+RawAbstractType* NativeCallComp::StaticType() const {
+  // The result type of the native function is identical to the result type of
+  // the enclosing native Dart function.
+  // TODO(regis): Can we trust it or should we check anyway? Check for now.
+  return Type::DynamicType();
+}
+
+
+RawAbstractType* StoreIndexedComp::StaticType() const {
+  return value()->StaticType();
+}
+
+
+RawAbstractType* InstanceSetterComp::StaticType() const {
+  // TODO(regis): Would it be correct to return value()->StaticType()?
+  return Type::DynamicType();
+}
+
+
+RawAbstractType* StaticSetterComp::StaticType() const {
+  // TODO(regis): Would it be correct/better to return value()->StaticType()?
+  return setter_function().result_type();
+}
+
+
+RawAbstractType* LoadInstanceFieldComp::StaticType() const {
+  return field().type();
+}
+
+
+RawAbstractType* StoreInstanceFieldComp::StaticType() const {
+  const AbstractType& assigned_value_type =
+      AbstractType::Handle(value()->StaticType());
+  if (assigned_value_type.IsDynamicType()) {
+    // Static type of assigned value is unknown, return static type of field.
+    return field().type();
+  }
+  return assigned_value_type.raw();
+}
+
+
+RawAbstractType* LoadStaticFieldComp::StaticType() const {
+  return field().type();
+}
+
+
+RawAbstractType* StoreStaticFieldComp::StaticType() const {
+  const AbstractType& assigned_value_type =
+      AbstractType::Handle(value()->StaticType());
+  if (assigned_value_type.IsDynamicType()) {
+    // Static type of assigned value is unknown, return static type of field.
+    return field().type();
+  }
+  return assigned_value_type.raw();
+}
+
+
+RawAbstractType* BooleanNegateComp::StaticType() const {
+  return Type::BoolInterface();
+}
+
+
+RawAbstractType* InstanceOfComp::StaticType() const {
+  return Type::BoolInterface();
+}
+
+
+RawAbstractType* CreateArrayComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* CreateClosureComp::StaticType() const {
+  const Function& fun = function();
+  const Class& signature_class = Class::Handle(fun.signature_class());
+  // TODO(regis): Can we take (constant) type_arguments() into consideration?
+  // For now, we return Dynamic (no type test elimination) if the signature
+  // class is parameterized, or a non-parameterized finalized type otherwise.
+  if (signature_class.HasTypeArguments()) {
+    return Type::DynamicType();
+  }
+  // Make sure we use the canonical signature class.
+  const Type& type = Type::Handle(signature_class.SignatureType());
+  const Class& canonical_signature_class = Class::Handle(type.type_class());
+  return Type::NewNonParameterizedType(canonical_signature_class);
+}
+
+
+RawAbstractType* AllocateObjectComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* AllocateObjectWithBoundsCheckComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* NativeLoadFieldComp::StaticType() const {
+  ASSERT(!type().IsNull());
+  return type().raw();
+}
+
+
+RawAbstractType* NativeStoreFieldComp::StaticType() const {
+  return value()->StaticType();
+}
+
+
+RawAbstractType* InstantiateTypeArgumentsComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* ExtractConstructorTypeArgumentsComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* ExtractConstructorInstantiatorComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* AllocateContextComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* ChainContextComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* CloneContextComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
+RawAbstractType* CatchEntryComp::StaticType() const {
+  UNREACHABLE();
+  return AbstractType::null();
+}
+
+
 }  // namespace dart