Add source fingerprint computation to function. Will be used to detect unexpected changes of functi…

runtime/vm/object.cc

 // 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.
 
 #include "vm/object.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
@@ skipping 4172 matching lines @@
       tmp = cls.UserVisibleName();
     }
   }
   suffix = Symbols::Dot();
   tmp = String::Concat(tmp, suffix);
   suffix = UserVisibleName();
   return String::Concat(tmp, suffix);
 }
 
 
+// Construct fingerprint from token stream. The token stream contains also
+// arguments.
+intptr_t Function::SourceFingerprint() const {
+  intptr_t result = String::Handle(Signature()).Hash();
+  TokenStream::Iterator tokens_iterator(TokenStream::Handle(
+      Script::Handle(script()).tokens()), token_pos());
+  Object& obj = Object::Handle();
+  String& literal = String::Handle();
+  while (tokens_iterator.CurrentPosition() < end_token_pos()) {
+    intptr_t val = 0;
+    obj = tokens_iterator.CurrentToken();
+    if (obj.IsSmi()) {
+      val = Smi::Cast(obj).Value();
+    } else {
+      literal = tokens_iterator.MakeLiteralToken(obj);
+      val = literal.Hash();
+    }
+    result = 31 * result + val;
+    tokens_iterator.Advance();
+  }
+  return result;
+}
+
+
 const char* Function::ToCString() const {
   const char* static_str = is_static() ? " static" : "";
   const char* abstract_str = is_abstract() ? " abstract" : "";
   const char* kind_str = NULL;
   const char* const_str = is_const() ? " const" : "";
   switch (kind()) {
     case RawFunction::kRegularFunction:
     case RawFunction::kClosureFunction:
     case RawFunction::kGetterFunction:
     case RawFunction::kSetterFunction:
@@ skipping 7958 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* WeakProperty::ToCString() const {
   return "_WeakProperty";
 }
 
 }  // namespace dart