[NaCl SDK] nacl_io: Add new fakes

native_client_sdk/src/tests/nacl_io_test/fake_var_manager.cc

Index: native_client_sdk/src/tests/nacl_io_test/fake_var_manager.cc
diff --git a/native_client_sdk/src/tests/nacl_io_test/fake_var_manager.cc b/native_client_sdk/src/tests/nacl_io_test/fake_var_manager.cc
new file mode 100644
index 0000000000000000000000000000000000000000..45b54ba6ff0d9a47ffb3b650955645866393e447
--- /dev/null
+++ b/native_client_sdk/src/tests/nacl_io_test/fake_var_manager.cc
@@ -0,0 +1,114 @@
+// Copyright (c) 2014 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "fake_var_manager.h"
+
+#include "gtest/gtest.h"
+
+FakeVarManager::FakeVarManager() : debug(false), next_id_(1) {}
+
+FakeVarManager::~FakeVarManager() {
+  // The ref counts for all vars should be zero.
+  for (VarMap::const_iterator iter = var_map_.begin(); iter != var_map_.end();
+       ++iter) {
+    const FakeVarData& var_data = iter->second;
+    EXPECT_EQ(0, var_data.ref_count) << "Non-zero refcount on "
+                                     << Describe(var_data);
+  }
+}
+
+FakeVarData* FakeVarManager::CreateVarData() {
+  Id id = next_id_++;
+  FakeVarData data;
+  data.id = id;
+  data.ref_count = 1;
+  var_map_[id] = data;
+  return &var_map_[id];
+}
+
+void FakeVarManager::AddRef(PP_Var var) {
+  // From ppb_var.h:
+  //   AddRef() adds a reference to the given var. If this is not a refcounted
+  //   object, this function will do nothing so you can always call it no matter
+  //   what the type.
+
+  FakeVarData* var_data = GetVarData(var);
+  if (!var_data)
+    return;
+
+  EXPECT_GT(var_data->ref_count, 0)
+       << "AddRefing freed " << Describe(*var_data);
+  var_data->ref_count++;
+  if (debug)
+    printf("AddRef of %s [new refcount=%d]\n",
+           Describe(*var_data).c_str(),
+           var_data->ref_count);
+}
+
+std::string FakeVarManager::Describe(const FakeVarData& var_data) {
+  std::stringstream rtn;
+  switch (var_data.type) {
+    case PP_VARTYPE_STRING:
+      rtn << "string resource " << var_data.id <<
+             " with value \"" << var_data.string_value << "\"";
+      break;
+    case PP_VARTYPE_ARRAY:
+      rtn << "array resource with id " << var_data.id;
+      break;
+    default:

[binji, 2014/01/17 01:31:14]

array buffer?

[Sam Clegg, 2014/01/17 22:40:11]

Done.

+      rtn << "resource " << var_data.id << " of type " << var_data.type;
+      break;
+  }
+  return rtn.str();
+}
+
+void FakeVarManager::Destroy(PP_Var var) {
+  // Release each PP_Var in the array
+  switch (var.type) {
+    case PP_VARTYPE_ARRAY: {
+      std::vector<PP_Var>& vector = GetVarData(var)->array_value;

[binji, 2014/01/17 01:31:14]

NULL check?

+      for (std::vector<PP_Var>::iterator it = vector.begin();
+          it != vector.end(); ++it) {
+        Release(*it);
+      }
+      vector.clear();
+      break;
+    }
+    default:
+      break;
+  }
+}
+
+FakeVarData* FakeVarManager::GetVarData(PP_Var var) {
+  VarMap::iterator iter = var_map_.find(var.value.as_id);
+  if (iter == var_map_.end())
+    return NULL;
+  return &iter->second;
+}
+
+void FakeVarManager::Release(PP_Var var) {
+  // From ppb_var.h:
+  //   Release() removes a reference to given var, deleting it if the internal
+  //   reference count becomes 0. If the given var is not a refcounted object,
+  //   this function will do nothing so you can always call it no matter what
+  //   the type.
+  FakeVarData* var_data = GetVarData(var);
+  if (!var_data) {
+    if (debug)
+      printf("Releasing simple var\n");
+    return;
+  }
+
+  EXPECT_GT(var_data->ref_count, 0)
+      << "Releasing freed " << Describe(*var_data);
+
+  var_data->ref_count--;
+  if (debug)
+    printf("Released %s [new refcount=%d]\n",
+           Describe(*var_data).c_str(),
+           var_data->ref_count);
+
+  if (var_data->ref_count == 0)
+    Destroy(var);

[binji, 2014/01/17 01:31:14]

erase item in var_map_

[Sam Clegg, 2014/01/17 22:40:11]

I was thinking of leaving the var_map alone until the manager is destroyed. 
Then we don't reuse Id's, and we can check the everything has a refcount of zero
at shutdown.

[binji, 2014/01/17 22:59:17]

OK, sounds good. Maybe add a comment for that?

+}