Add fast paths for Smi values in the dart embedding api.

vm/object.h

Index: vm/object.h
===================================================================
--- vm/object.h	(revision 6600)
+++ vm/object.h	(working copy)
@@ -25,6 +25,7 @@
   class clazz;
 CLASS_LIST(DEFINE_FORWARD_DECLARATION)
 #undef DEFINE_FORWARD_DECLARATION
+class Api;
 class Assembler;
 class Code;
 class LocalScope;
@@ -2737,10 +2738,17 @@
     return reinterpret_cast<intptr_t>(New(value));
   }
 
-  static bool IsValid(intptr_t value);
-  static bool IsValid64(int64_t value);
+  static bool IsValid(intptr_t value) {
+    return (value >= kMinValue) && (value <= kMaxValue);
+  }
 
+  static bool IsValid64(int64_t value) {
+    return (value >= kMinValue) && (value <= kMaxValue);
+  }
+
  private:
+  friend class Api;  // For ValueFromRaw

[cshapiro, 2012/04/16 20:32:45]

Co-locate this with the other friend classes below?

+
   static intptr_t ValueFromRaw(uword raw_value) {
     intptr_t value = raw_value;
     ASSERT((value & kSmiTagMask) == kSmiTag);