Process generic function type arguments in more places (function type tests,

runtime/vm/raw_object.h

 // Copyright (c) 2012, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 #ifndef RUNTIME_VM_RAW_OBJECT_H_
 #define RUNTIME_VM_RAW_OBJECT_H_
 
 #include "platform/assert.h"
 #include "vm/atomic.h"
 #include "vm/exceptions.h"
@@ skipping 1765 matching lines @@
 
 
 class RawClosure : public RawInstance {
  private:
   RAW_HEAP_OBJECT_IMPLEMENTATION(Closure);
 
   RawObject** from() {
     return reinterpret_cast<RawObject**>(&ptr()->instantiator_type_arguments_);
   }
 
-  // No instance fields should be declared before the following 3 fields whose
+  // No instance fields should be declared before the following 4 fields whose
   // offsets must be identical in Dart and C++.
 
   // These 4 fields are also declared in the Dart source of class _Closure.
   RawTypeArguments* instantiator_type_arguments_;
   RawTypeArguments* function_type_arguments_;
   RawFunction* function_;
   RawContext* context_;
 
   RawObject** to() { return reinterpret_cast<RawObject**>(&ptr()->context_); }
+
+  // Note that instantiator_type_arguments_ and function_type_arguments_ are
+  // used to instantiate the signature of function_ when this closure is
+  // involved in a type test. In other words, these fields define the function
+  // type of this closure instance, but they are not used when invoking it.
+  // If this closure is generic, it can be invoked with function type arguments
+  // that will be processed in the prolog of the closure function_. For example,
+  // if the generic closure function_ has a generic parent function, the
+  // passed-in function type arguments get concatenated to the function type
+  // arguments of the parent that are found in the context_.
 };
 
 
 class RawNumber : public RawInstance {
   RAW_OBJECT_IMPLEMENTATION(Number);
 };
 
 
 class RawInteger : public RawNumber {
   RAW_OBJECT_IMPLEMENTATION(Integer);
@@ skipping 630 matching lines @@
   COMPILE_ASSERT(kExternalTypedDataInt8ArrayCid ==
                  kTypedDataInt8ArrayViewCid + 15);
   COMPILE_ASSERT(kByteBufferCid == kExternalTypedDataInt8ArrayCid + 14);
   COMPILE_ASSERT(kNullCid == kByteBufferCid + 1);
   return (kNullCid - kTypedDataInt8ArrayCid);
 }
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_RAW_OBJECT_H_