Fix issue 5564152 (VM crash): stack at exit of method was incorrect. Smi equality with Mint was c...

runtime/vm/object.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/object.h"
 
 #include "vm/assembler.h"
 #include "vm/assert.h"
 #include "vm/bigint_operations.h"
 #include "vm/bootstrap.h"
@@ skipping 4945 matching lines @@
 
 bool Instance::IsValidFieldOffset(int offset) const {
   const Class& cls = Class::Handle(clazz());
   return (offset >= 0 && offset <= (cls.instance_size() - kWordSize));
 }
 
 
 const char* Instance::ToCString() const {
   if (IsNull()) {
     return "null";
+  } else if (Isolate::Current()->no_gc_scope_depth() > 0) {
+    // Can occur when running disassembler.
+    return "Instance";
   } else {
     const char* kFormat = "Instance of '%s'";
     Class& cls = Class::Handle(clazz());
     TypeArguments& type_arguments = TypeArguments::Handle();
     const intptr_t num_type_arguments = cls.NumTypeArguments();
     if (num_type_arguments > 0) {
       type_arguments = GetTypeArguments();
     }
     const Type& type = Type::Handle(
         Type::NewParameterizedType(cls, type_arguments));
@@ skipping 1965 matching lines @@
   const String& str = String::Handle(pattern());
   const char* format = "JSRegExp: pattern=%s flags=%s";
   intptr_t len = OS::SNPrint(NULL, 0, format, str.ToCString(), Flags());
   char* chars = reinterpret_cast<char*>(
       Isolate::Current()->current_zone()->Allocate(len + 1));
   OS::SNPrint(chars, (len + 1), format, str.ToCString(), Flags());
   return chars;
 }
 
 }  // namespace dart