Build CodeSourceMap for each code object

runtime/vm/code_descriptors.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/code_descriptors.h"
 
 namespace dart {
 
 DECLARE_FLAG(bool, precompilation);
 
@@ skipping 28 matching lines @@
   if (encoded_data_.length() == 0) {
     return Object::empty_descriptors().raw();
   }
   return PcDescriptors::New(&encoded_data_);
 }
 
 
 
 void CodeSourceMapBuilder::AddEntry(intptr_t pc_offset,
                                     TokenPosition token_pos) {
+  // Require pc offset to monotonically increase.
+  ASSERT((prev_pc_offset < pc_offset) ||
+         ((prev_pc_offset == 0) && (pc_offset == 0)));
   CodeSourceMap::EncodeInteger(&encoded_data_, pc_offset - prev_pc_offset);
   CodeSourceMap::EncodeInteger(&encoded_data_,
                                token_pos.value() - prev_token_pos);
 
   prev_pc_offset = pc_offset;
   prev_token_pos = token_pos.value();
 }
 
 
 RawCodeSourceMap* CodeSourceMapBuilder::Finalize() {
@@ skipping 73 matching lines @@
                               list_[i].needs_stacktrace,
                               has_catch_all);
       handlers.SetHandledTypes(i, *list_[i].handler_types);
     }
   }
   return handlers.raw();
 }
 
 
 }  // namespace dart