DevFS initial implementation

runtime/vm/json_stream.cc

Index: runtime/vm/json_stream.cc
diff --git a/runtime/vm/json_stream.cc b/runtime/vm/json_stream.cc
index 003f1b36d3c76a91340a6ab3dbfadf43be15d4af..c367f2e0837239535cb870f09fdfeef9b434228a 100644
--- a/runtime/vm/json_stream.cc
+++ b/runtime/vm/json_stream.cc
@@ -46,6 +46,8 @@ JSONStream::JSONStream(intptr_t buf_size)
       id_zone_(&default_id_zone_),
       reply_port_(ILLEGAL_PORT),
       seq_(NULL),
+      parameter_keys_(NULL),
+      parameter_values_(NULL),
       method_(""),
       param_keys_(NULL),
       param_values_(NULL),
@@ -70,13 +72,18 @@ void JSONStream::Setup(Zone* zone,
                        const Instance& seq,
                        const String& method,
                        const Array& param_keys,
-                       const Array& param_values) {
+                       const Array& param_values,
+                       bool parameters_are_dart_objects) {
   set_reply_port(reply_port);
   seq_ = &Instance::ZoneHandle(seq.raw());
   method_ = method.ToCString();
 
-  String& string_iterator = String::Handle();
-  if (param_keys.Length() > 0) {
+  if (parameters_are_dart_objects) {
+    parameter_keys_ = &Array::ZoneHandle(param_keys.raw());
+    parameter_values_ = &Array::ZoneHandle(param_values.raw());
+    ASSERT(parameter_keys_->Length() == parameter_values_->Length());
+  } else if (param_keys.Length() > 0) {
+    String& string_iterator = String::Handle();
     ASSERT(param_keys.Length() == param_values.Length());
     const char** param_keys_native =
         zone->Alloc<const char*>(param_keys.Length());
@@ -92,6 +99,7 @@ void JSONStream::Setup(Zone* zone,
     }
     SetParams(param_keys_native, param_values_native, param_keys.Length());
   }
+
   if (FLAG_trace_service) {
     Isolate* isolate = Isolate::Current();
     ASSERT(isolate != NULL);
@@ -130,6 +138,14 @@ static const char* GetJSONRpcErrorMessage(intptr_t code) {
       return "Isolate must be runnable";
     case kIsolateMustBePaused:
       return "Isolate must be paused";
+    case kIsolateIsReloading:
+      return "Isolate is reloading";
+    case kFileSystemAlreadyExists:
+      return "File system already exists";
+    case kFileSystemDoesNotExist:
+      return "File system does not exist";
+    case kFileDoesNotExist:
+      return "File does not exist";
     default:
       return "Extension error";
   }
@@ -667,6 +683,42 @@ void JSONStream::set_reply_port(Dart_Port port) {
 }
 
 
+intptr_t JSONStream::NumObjectParameters() const {
+  if (parameter_keys_ == NULL) {
+    return 0;
+  }
+  ASSERT(parameter_keys_ != NULL);
+  ASSERT(parameter_values_ != NULL);
+  return parameter_keys_->Length();
+}
+
+
+RawObject* JSONStream::GetObjectParameterKey(intptr_t i) const {
+  ASSERT((i >= 0) && (i < NumObjectParameters()));
+  return parameter_keys_->At(i);
+}
+
+
+RawObject* JSONStream::GetObjectParameterValue(intptr_t i) const {
+  ASSERT((i >= 0) && (i < NumObjectParameters()));
+  return parameter_values_->At(i);
+}
+
+
+RawObject* JSONStream::LookupObjectParam(const char* c_key) const {
+  const String& key = String::Handle(String::New(c_key));
+  Object& test = Object::Handle();
+  const intptr_t num_object_parameters = NumObjectParameters();
+  for (intptr_t i = 0; i < num_object_parameters; i++) {
+    test = GetObjectParameterKey(i);
+    if (test.IsString() && String::Cast(test).Equals(key)) {
+      return GetObjectParameterValue(i);
+    }
+  }
+  return Object::null();
+}
+
+
 void JSONStream::SetParams(const char** param_keys,
                            const char** param_values,
                            intptr_t num_params) {