Disabled context variables in local variable list in the debugger

runtime/vm/debugger.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/debugger.h"
 
 #include "include/dart_api.h"
 
 #include "vm/code_generator.h"
 #include "vm/code_patcher.h"
@@ skipping 475 matching lines @@
   RawLocalVarDescriptors::VarInfo var_info;
   var_descriptors_.GetInfo(desc_index, &var_info);
   ASSERT(token_pos != NULL);
   *token_pos = var_info.begin_pos;
   ASSERT(end_pos != NULL);
   *end_pos = var_info.end_pos;
   ASSERT(value != NULL);
   if (var_info.kind == RawLocalVarDescriptors::kStackVar) {
     *value = GetLocalVarValue(var_info.index);
   } else {
+    // TODO(tball): enable context variables once problem with VariableAt() is
+    // fixed, where frame_ctx_level is sometimes off by 1 (issues 8593 and 8594)
+    /*
     ASSERT(var_info.kind == RawLocalVarDescriptors::kContextVar);
     ASSERT(!ctx_.IsNull());
     // The context level at the PC/token index of this activation frame.
     intptr_t frame_ctx_level = ContextLevel();
     // The context level of the variable.
     intptr_t var_ctx_level = var_info.scope_id;
     intptr_t level_diff = frame_ctx_level - var_ctx_level;
     intptr_t ctx_slot = var_info.index;
     if (level_diff == 0) {
       *value = ctx_.At(ctx_slot);
     } else {
       ASSERT(level_diff > 0);
       Context& ctx = Context::Handle(ctx_.raw());
       while (level_diff > 0) {
         ASSERT(!ctx.IsNull());
         level_diff--;
         ctx = ctx.parent();
       }
       ASSERT(!ctx.IsNull());
       *value = ctx.At(ctx_slot);
-    }
+    } */
+    *value = Symbols::New("<unknown>");
   }
 }
 
 
 RawArray* ActivationFrame::GetLocalVariables() {
   GetDescIndices();
   intptr_t num_variables = desc_indices_.length();
   String& var_name = String::Handle();
   Instance& value = Instance::Handle();
   const Array& list = Array::Handle(Array::New(2 * num_variables));
@@ skipping 1203 matching lines @@
 }
 
 
 void Debugger::RegisterCodeBreakpoint(CodeBreakpoint* bpt) {
   ASSERT(bpt->next() == NULL);
   bpt->set_next(code_breakpoints_);
   code_breakpoints_ = bpt;
 }
 
 }  // namespace dart