Getting value of local variables on stack trace

runtime/vm/compiler.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.
 
 #include "vm/compiler.h"
 
 #include "vm/assembler.h"
 #include "vm/ast_printer.h"
 #include "vm/code_generator.h"
 #include "vm/code_index_table.h"
@@ skipping 161 matching lines @@
       OS::Print(" %d : 0x%x '%s'\n",
           code.GetPointerOffsetAt(i), addr, obj.ToCString());
     }
     OS::Print("}\n");
     OS::Print("PC Descriptors for function '%s' {\n", function_fullname);
     OS::Print("(pc, kind, id, try-index, token-index)\n");
     const PcDescriptors& descriptors =
         PcDescriptors::Handle(code.pc_descriptors());
     OS::Print("%s", descriptors.ToCString());
     OS::Print("}\n");
+    OS::Print("Variable Descriptors for function '%s' {\n", function_fullname);
+    const LocalVarDescriptors& var_descriptors =
+        LocalVarDescriptors::Handle(code.var_descriptors());
+    intptr_t var_desc_length = var_descriptors.Length();
+    String& var_name = String::Handle();
+    for (intptr_t i = 0; i < var_desc_length; i++) {
+      var_name = var_descriptors.GetName(i);
+      intptr_t scope_id, ignore;
+      var_descriptors.GetScopeInfo(i, &scope_id, &ignore, &ignore);
+      intptr_t slot = var_descriptors.GetSlotIndex(i);
+      OS::Print("  var %s scope %ld offset %ld\n",
+                var_name.ToCString(), scope_id, slot);
+    }
+    OS::Print("}\n");
     OS::Print("Exception Handlers for function '%s' {\n", function_fullname);
     const ExceptionHandlers& handlers =
         ExceptionHandlers::Handle(code.exception_handlers());
     OS::Print("%s", handlers.ToCString());
     OS::Print("}\n");
   }
 }
 
 
 void Compiler::CompileFunction(const Function& function) {
@@ skipping 73 matching lines @@
                               kNoArgumentNames));
   if (result.IsUnhandledException()) {
     // TODO(srdjan): implement proper exit from compiler.
     UNIMPLEMENTED();
   }
   return result.raw();
 }
 
 
 }  // namespace dart