Speed up identifier, keyword and smi parsing

src/char-predicates-inl.h

 // Copyright 2011 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef V8_CHAR_PREDICATES_INL_H_
 #define V8_CHAR_PREDICATES_INL_H_
 
 #include "src/char-predicates.h"
 
 namespace v8 {
@@ skipping 17 matching lines @@
   return c == 0x000A;
 }
 
 
 inline bool IsInRange(int value, int lower_limit, int higher_limit) {
   DCHECK(lower_limit <= higher_limit);
   return static_cast<unsigned int>(value - lower_limit) <=
       static_cast<unsigned int>(higher_limit - lower_limit);
 }
 
+inline bool IsAsciiIdentifier(uc32 c) {
+  return IsAlphaNumeric(c) || c == '$' || c == '_';
+}
+
+inline bool IsAlphaNumeric(uc32 c) {
+  return IsInRange(AsciiAlphaToLower(c), 'a', 'z') || IsDecimalDigit(c);
+}
 
 inline bool IsDecimalDigit(uc32 c) {
   // ECMA-262, 3rd, 7.8.3 (p 16)
   return IsInRange(c, '0', '9');
 }
 
 
 inline bool IsHexDigit(uc32 c) {
   // ECMA-262, 3rd, 7.6 (p 15)
   return IsDecimalDigit(c) || IsInRange(AsciiAlphaToLower(c), 'a', 'f');
@@ skipping 26 matching lines @@
       return false;
     default:
       return true;
   }
 }
 
 
 } }  // namespace v8::internal
 
 #endif  // V8_CHAR_PREDICATES_INL_H_