Cleanup of deoptimization environment copying functions.

runtime/vm/flow_graph_builder.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/flow_graph_builder.h"
 
 #include "lib/invocation_mirror.h"
 #include "vm/ast_printer.h"
 #include "vm/bit_vector.h"
 #include "vm/code_descriptors.h"
@@ skipping 63 matching lines @@
   ASSERT(callee_graph->max_block_id() > caller_graph_->max_block_id());
   ASSERT(callee_graph->max_virtual_register_number() >
          caller_graph_->max_virtual_register_number());
 
   // Adjust the caller's maximum block id and current SSA temp index.
   caller_graph_->set_max_block_id(callee_graph->max_block_id());
   caller_graph_->set_current_ssa_temp_index(
       callee_graph->max_virtual_register_number());
 
   // Attach the outer environment on each instruction in the callee graph.
+  ASSERT(call_->env() != NULL);
   for (BlockIterator block_it = callee_graph->postorder_iterator();
        !block_it.Done();
        block_it.Advance()) {
     for (ForwardInstructionIterator it(block_it.Current());
          !it.Done();
          it.Advance()) {
       Instruction* instr = it.Current();
       // TODO(zerny): Avoid creating unnecessary environments. Note that some
       // optimizations need deoptimization info for non-deoptable instructions,
       // eg, LICM on GOTOs.
@@ skipping 3649 matching lines @@
   intptr_t len = OS::SNPrint(NULL, 0, kFormat, function_name, reason) + 1;
   char* chars = Isolate::Current()->current_zone()->Alloc<char>(len);
   OS::SNPrint(chars, len, kFormat, function_name, reason);
   const Error& error = Error::Handle(
       LanguageError::New(String::Handle(String::New(chars))));
   Isolate::Current()->long_jump_base()->Jump(1, error);
 }
 
 
 }  // namespace dart