Fix infinite recursion when dealing with cyclic library dependencies.

bin/process_script.cc

 // Copyright (c) 2011, 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.
 
 // Handle dart scripts.
 
 #include <assert.h>
 #include <stdlib.h>
 #include <string.h>
 #include <stdio.h>
@@ skipping 31 matching lines @@
   *path_sep = '\0';
   intptr_t len = snprintf(NULL, 0, "%s%s%s",
                           path, File::PathSeparator(), filename);
   char* absolute_filename = reinterpret_cast<char*>(malloc(len + 1));
   ASSERT(absolute_filename != NULL);
 
   snprintf(absolute_filename, len + 1, "%s%s%s",
            path, File::PathSeparator(), filename);
 
   free(path);
-  return absolute_filename;
+  char* canonical_filename = File::GetCanonicalPath(absolute_filename);
+  if (canonical_filename == NULL) {
+    return absolute_filename;
+  }
+  free(absolute_filename);
+  return canonical_filename;
 }
 
 
 static Dart_Result ReadStringFromFile(const char* filename) {
   File* file = File::OpenFile(filename, false);
   if (file == NULL) {
     const char* format = "Unable to open file: %s";
     intptr_t len = snprintf(NULL, 0, format, filename);
     // TODO(iposva): Allocate from the zone instead of leaking error string
     // here. On the other hand the binary is about the exit anyway.
@@ skipping 86 matching lines @@
 Dart_Result LoadScript(const char* script_name) {
   Dart_Result result = ReadStringFromFile(script_name);
   if (!Dart_IsValidResult(result)) {
     return result;
   }
   Dart_Handle source = Dart_GetResult(result);
   Dart_Handle url = Dart_NewString(script_name);
 
   return Dart_LoadScript(url, source, LibraryTagHandler);
 }