Remove script source from the snapshot in order to reduce the size and to make the image size small…

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 "platform/assert.h"
 #include "vm/assembler.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
@@ skipping 4319 matching lines @@
     }
     return String::NewSymbol(Token::Str(kind));
   } else {
     LiteralToken& token = LiteralToken::Handle();
     token ^= obj.raw();  // Must be a literal token.
     return token.literal();
   }
 }
 
 
+RawString* TokenStream::GenerateSource() const {
+  GrowableObjectArray& literals =
+      GrowableObjectArray::Handle(GrowableObjectArray::New(Length()));
+  String& literal = String::Handle();
+  String& blank = String::Handle(String::New(" "));
+  String& newline = String::Handle(String::New("\n"));
+  for (intptr_t i = 0; i < Length(); i++) {
+    Token::Kind kind = KindAt(i);
+    literal = LiteralAt(i);
+    literals.Add(literal);
+    if (kind == Token::kLBRACE) {
+      literals.Add(newline);
+    } else {
+      literals.Add(blank);
+    }
+  }
+  const Array& source = Array::Handle(Array::MakeArray(literals));
+  return String::ConcatAll(source);
+}
+
+
 RawTokenStream* TokenStream::New(intptr_t len) {
   const Class& token_stream_class = Class::Handle(Object::token_stream_class());
   TokenStream& result = TokenStream::Handle();
   {
     RawObject* raw = Object::Allocate(token_stream_class,
                                       TokenStream::InstanceSize(len),
                                       Heap::kOld);
     NoGCScope no_gc;
     result ^= raw;
     result.SetLength(len);
@@ skipping 18 matching lines @@
   }
   return result.raw();
 }
 
 
 const char* TokenStream::ToCString() const {
   return "TokenStream";
 }
 
 
+RawString* Script::source() const {
+  String& source = String::Handle(raw_ptr()->source_);
+  if (source.IsNull()) {
+    const TokenStream& token_stream = TokenStream::Handle(tokens());
+    return token_stream.GenerateSource();
+  } else {
+    return raw_ptr()->source_;
+  }
+}
+
+
 void Script::set_url(const String& value) const {
   StorePointer(&raw_ptr()->url_, value.raw());
 }
 
 
 void Script::set_source(const String& value) const {
   StorePointer(&raw_ptr()->source_, value.raw());
 }
 
 
@@ skipping 5611 matching lines @@
   const String& str = String::Handle(pattern());
   const char* format = "JSRegExp: pattern=%s flags=%s";
   intptr_t len = OS::SNPrint(NULL, 0, format, str.ToCString(), Flags());
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len + 1));
   OS::SNPrint(chars, (len + 1), format, str.ToCString(), Flags());
   return chars;
 }
 
 }  // namespace dart