src: replace assert() with CHECK()

Mechanically replace assert() statements with UNREACHABLE(), CHECK(),
or CHECK_{EQ,NE,LT,GT,LE,GE}() statements.

The exceptions are src/node.h and src/node_object_wrap.h because they
are public headers.

PR-URL: https://github.com/node-forward/node/pull/16
Reviewed-By: Fedor Indutny <fedor@indutny.com>

36 files changed, 348 insertions, 359 deletions

diff --git a/src/async-wrap-inl.h b/src/async-wrap-inl.h
index 59157cc0f4..4cbf8f493b 100644
--- a/src/async-wrap-inl.h
+++ b/src/async-wrap-inl.h
@@ -29,9 +29,7 @@
 #include "env-inl.h"
 #include "util.h"
 #include "util-inl.h"
-
 #include "v8.h"
-#include <assert.h>
 
 namespace node {
 
@@ -74,7 +72,7 @@ inline v8::Handle<v8::Value> AsyncWrap::MakeDomainCallback(
     const v8::Handle<v8::Function> cb,
     int argc,
     v8::Handle<v8::Value>* argv) {
-  assert(env()->context() == env()->isolate()->GetCurrentContext());
+  CHECK_EQ(env()->context(), env()->isolate()->GetCurrentContext());
 
   v8::Local<v8::Object> context = object();
   v8::Local<v8::Object> process = env()->process_object();
@@ -169,7 +167,7 @@ inline v8::Handle<v8::Value> AsyncWrap::MakeCallback(
   if (env()->using_domains())
     return MakeDomainCallback(cb, argc, argv);
 
-  assert(env()->context() == env()->isolate()->GetCurrentContext());
+  CHECK_EQ(env()->context(), env()->isolate()->GetCurrentContext());
 
   v8::Local<v8::Object> context = object();
   v8::Local<v8::Object> process = env()->process_object();
@@ -235,7 +233,7 @@ inline v8::Handle<v8::Value> AsyncWrap::MakeCallback(
     v8::Handle<v8::Value>* argv) {
   v8::Local<v8::Value> cb_v = object()->Get(symbol);
   v8::Local<v8::Function> cb = cb_v.As<v8::Function>();
-  assert(cb->IsFunction());
+  CHECK(cb->IsFunction());
 
   return MakeCallback(cb, argc, argv);
 }
@@ -247,7 +245,7 @@ inline v8::Handle<v8::Value> AsyncWrap::MakeCallback(
     v8::Handle<v8::Value>* argv) {
   v8::Local<v8::Value> cb_v = object()->Get(index);
   v8::Local<v8::Function> cb = cb_v.As<v8::Function>();
-  assert(cb->IsFunction());
+  CHECK(cb->IsFunction());
 
   return MakeCallback(cb, argc, argv);
 }
diff --git a/src/base-object-inl.h b/src/base-object-inl.h
index 4d726df7ca..17540f4822 100644
--- a/src/base-object-inl.h
+++ b/src/base-object-inl.h
@@ -27,19 +27,17 @@
 #include "util-inl.h"
 #include "v8.h"
 
-#include <assert.h>
-
 namespace node {
 
 inline BaseObject::BaseObject(Environment* env, v8::Local<v8::Object> handle)
     : handle_(env->isolate(), handle),
       env_(env) {
-  assert(!handle.IsEmpty());
+  CHECK_EQ(false, handle.IsEmpty());
 }
 
 
 inline BaseObject::~BaseObject() {
-  assert(handle_.IsEmpty());
+  CHECK(handle_.IsEmpty());
 }
 
 
@@ -71,7 +69,7 @@ template <typename Type>
 inline void BaseObject::MakeWeak(Type* ptr) {
   v8::HandleScope scope(env_->isolate());
   v8::Local<v8::Object> handle = object();
-  assert(handle->InternalFieldCount() > 0);
+  CHECK_GT(handle->InternalFieldCount(), 0);
   Wrap<Type>(handle, ptr);
   handle_.MarkIndependent();
   handle_.SetWeak<Type>(ptr, WeakCallback<Type>);
diff --git a/src/cares_wrap.cc b/src/cares_wrap.cc
index c6ffcf0fac..db2526fd51 100644
--- a/src/cares_wrap.cc
+++ b/src/cares_wrap.cc
@@ -31,7 +31,6 @@
 #include "util.h"
 #include "uv.h"
 
-#include <assert.h>
 #include <errno.h>
 #include <stdlib.h>
 #include <string.h>
@@ -85,7 +84,7 @@ RB_GENERATE_STATIC(ares_task_list, ares_task_t, node, cmp_ares_tasks)
 /* call back into c-ares for possibly processing timeouts. */
 static void ares_timeout(uv_timer_t* handle) {
   Environment* env = Environment::from_cares_timer_handle(handle);
-  assert(!RB_EMPTY(env->cares_task_list()));
+  CHECK_EQ(false, RB_EMPTY(env->cares_task_list()));
   ares_process_fd(env->cares_channel(), ARES_SOCKET_BAD, ARES_SOCKET_BAD);
 }
 
@@ -159,7 +158,7 @@ static void ares_sockstate_cb(void* data,
       /* If this is the first socket then start the timer. */
       uv_timer_t* timer_handle = env->cares_timer_handle();
       if (!uv_is_active(reinterpret_cast<uv_handle_t*>(timer_handle))) {
-        assert(RB_EMPTY(env->cares_task_list()));
+        CHECK(RB_EMPTY(env->cares_task_list()));
         uv_timer_start(timer_handle, ares_timeout, 1000, 1000);
       }
 
@@ -184,8 +183,8 @@ static void ares_sockstate_cb(void* data,
     /* read == 0 and write == 0 this is c-ares's way of notifying us that */
     /* the socket is now closed. We must free the data associated with */
     /* socket. */
-    assert(task &&
-           "When an ares socket is closed we should have a handle for it");
+    CHECK(task &&
+          "When an ares socket is closed we should have a handle for it");
 
     RB_REMOVE(ares_task_list, env->cares_task_list(), task);
     uv_close(reinterpret_cast<uv_handle_t*>(&task->poll_watcher),
@@ -233,18 +232,18 @@ class QueryWrap : public AsyncWrap {
   }
 
   virtual ~QueryWrap() {
-    assert(!persistent().IsEmpty());
+    CHECK_EQ(false, persistent().IsEmpty());
     persistent().Reset();
   }
 
   // Subclasses should implement the appropriate Send method.
   virtual int Send(const char* name) {
-    assert(0);
+    UNREACHABLE();
     return 0;
   }
 
   virtual int Send(const char* name, int family) {
-    assert(0);
+    UNREACHABLE();
     return 0;
   }
 
@@ -301,7 +300,7 @@ class QueryWrap : public AsyncWrap {
   }
 
   void ParseError(int status) {
-    assert(status != ARES_SUCCESS);
+    CHECK_NE(status, ARES_SUCCESS);
     HandleScope handle_scope(env()->isolate());
     Context::Scope context_scope(env()->context());
     Local<Value> arg;
@@ -344,11 +343,11 @@ class QueryWrap : public AsyncWrap {
 
   // Subclasses should implement the appropriate Parse method.
   virtual void Parse(unsigned char* buf, int len) {
-    assert(0);
+    UNREACHABLE();
   };
 
   virtual void Parse(struct hostent* host) {
-    assert(0);
+    UNREACHABLE();
   };
 };
 
@@ -843,9 +842,9 @@ template <class Wrap>
 static void Query(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
 
-  assert(!args.IsConstructCall());
-  assert(args[0]->IsObject());
-  assert(args[1]->IsString());
+  CHECK_EQ(false, args.IsConstructCall());
+  CHECK(args[0]->IsObject());
+  CHECK(args[1]->IsString());
 
   Local<Object> req_wrap_obj = args[0].As<Object>();
   Local<String> string = args[1].As<String>();
@@ -894,7 +893,7 @@ void AfterGetAddrInfo(uv_getaddrinfo_t* req, int status, struct addrinfo* res) {
     // strings for each IP and filling the results array.
     address = res;
     while (address) {
-      assert(address->ai_socktype == SOCK_STREAM);
+      CHECK_EQ(address->ai_socktype, SOCK_STREAM);
 
       // Ignore random ai_family types.
       if (address->ai_family == AF_INET) {
@@ -921,7 +920,7 @@ void AfterGetAddrInfo(uv_getaddrinfo_t* req, int status, struct addrinfo* res) {
     // Iterate over the IPv6 responses putting them in the array.
     address = res;
     while (address) {
-      assert(address->ai_socktype == SOCK_STREAM);
+      CHECK_EQ(address->ai_socktype, SOCK_STREAM);
 
       // Ignore random ai_family types.
       if (address->ai_family == AF_INET6) {
@@ -1008,9 +1007,9 @@ static void IsIP(const FunctionCallbackInfo<Value>& args) {
 static void GetAddrInfo(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
 
-  assert(args[0]->IsObject());
-  assert(args[1]->IsString());
-  assert(args[2]->IsInt32());
+  CHECK(args[0]->IsObject());
+  CHECK(args[1]->IsString());
+  CHECK(args[2]->IsInt32());
   Local<Object> req_wrap_obj = args[0].As<Object>();
   node::Utf8Value hostname(args[1]);
 
@@ -1028,7 +1027,7 @@ static void GetAddrInfo(const FunctionCallbackInfo<Value>& args) {
     family = AF_INET6;
     break;
   default:
-    assert(0 && "bad address family");
+    CHECK(0 && "bad address family");
     abort();
   }
 
@@ -1097,7 +1096,7 @@ static void GetServers(const FunctionCallbackInfo<Value>& args) {
   ares_addr_node* servers;
 
   int r = ares_get_servers(env->cares_channel(), &servers);
-  assert(r == ARES_SUCCESS);
+  CHECK_EQ(r, ARES_SUCCESS);
 
   ares_addr_node* cur = servers;
 
@@ -1106,7 +1105,7 @@ static void GetServers(const FunctionCallbackInfo<Value>& args) {
 
     const void* caddr = static_cast<const void*>(&cur->addr);
     int err = uv_inet_ntop(cur->family, caddr, ip, sizeof(ip));
-    assert(err == 0);
+    CHECK_EQ(err, 0);
 
     Local<String> addr = OneByteString(env->isolate(), ip);
     server_array->Set(i, addr);
@@ -1121,7 +1120,7 @@ static void GetServers(const FunctionCallbackInfo<Value>& args) {
 static void SetServers(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
 
-  assert(args[0]->IsArray());
+  CHECK(args[0]->IsArray());
 
   Local<Array> arr = Local<Array>::Cast(args[0]);
 
@@ -1138,12 +1137,12 @@ static void SetServers(const FunctionCallbackInfo<Value>& args) {
   int err;
 
   for (uint32_t i = 0; i < len; i++) {
-    assert(arr->Get(i)->IsArray());
+    CHECK(arr->Get(i)->IsArray());
 
     Local<Array> elm = Local<Array>::Cast(arr->Get(i));
 
-    assert(elm->Get(0)->Int32Value());
-    assert(elm->Get(1)->IsString());
+    CHECK(elm->Get(0)->Int32Value());
+    CHECK(elm->Get(1)->IsString());
 
     int fam = elm->Get(0)->Int32Value();
     node::Utf8Value ip(elm->Get(1));
@@ -1160,7 +1159,7 @@ static void SetServers(const FunctionCallbackInfo<Value>& args) {
         err = uv_inet_pton(AF_INET6, *ip, &cur->addr);
         break;
       default:
-        assert(0 && "Bad address family.");
+        CHECK(0 && "Bad address family.");
         abort();
     }
 
@@ -1213,7 +1212,7 @@ static void Initialize(Handle<Object> target,
   Environment* env = Environment::GetCurrent(context);
 
   int r = ares_library_init(ARES_LIB_INIT_ALL);
-  assert(r == ARES_SUCCESS);
+  CHECK_EQ(r, ARES_SUCCESS);
 
   struct ares_options options;
   memset(&options, 0, sizeof(options));
@@ -1225,7 +1224,7 @@ static void Initialize(Handle<Object> target,
   r = ares_init_options(env->cares_channel_ptr(),
                         &options,
                         ARES_OPT_FLAGS | ARES_OPT_SOCK_STATE_CB);
-  assert(r == ARES_SUCCESS);
+  CHECK_EQ(r, ARES_SUCCESS);
 
   /* Initialize the timeout timer. The timer won't be started until the */
   /* first socket is opened. */
diff --git a/src/fs_event_wrap.cc b/src/fs_event_wrap.cc
index 133acec070..b054b86a6c 100644
--- a/src/fs_event_wrap.cc
+++ b/src/fs_event_wrap.cc
@@ -74,7 +74,7 @@ FSEventWrap::FSEventWrap(Environment* env, Handle<Object> object)
 
 
 FSEventWrap::~FSEventWrap() {
-  assert(initialized_ == false);
+  CHECK_EQ(initialized_, false);
 }
 
 
@@ -95,7 +95,7 @@ void FSEventWrap::Initialize(Handle<Object> target,
 
 
 void FSEventWrap::New(const FunctionCallbackInfo<Value>& args) {
-  assert(args.IsConstructCall());
+  CHECK(args.IsConstructCall());
   Environment* env = Environment::GetCurrent(args.GetIsolate());
   new FSEventWrap(env, args.This());
 }
@@ -144,7 +144,7 @@ void FSEventWrap::OnEvent(uv_fs_event_t* handle, const char* filename,
   HandleScope handle_scope(env->isolate());
   Context::Scope context_scope(env->context());
 
-  assert(wrap->persistent().IsEmpty() == false);
+  CHECK_EQ(wrap->persistent().IsEmpty(), false);
 
   // We're in a bind here. libuv can set both UV_RENAME and UV_CHANGE but
   // the Node API only lets us pass a single event to JS land.
@@ -165,7 +165,7 @@ void FSEventWrap::OnEvent(uv_fs_event_t* handle, const char* filename,
   } else if (events & UV_CHANGE) {
     event_string = env->change_string();
   } else {
-    assert(0 && "bad fs events flag");
+    CHECK(0 && "bad fs events flag");
     abort();
   }
 
diff --git a/src/handle_wrap.cc b/src/handle_wrap.cc
index eeda93017f..403b61ac98 100644
--- a/src/handle_wrap.cc
+++ b/src/handle_wrap.cc
@@ -69,7 +69,7 @@ void HandleWrap::Close(const FunctionCallbackInfo<Value>& args) {
   if (wrap == NULL || wrap->handle__ == NULL)
     return;
 
-  assert(!wrap->persistent().IsEmpty());
+  CHECK_EQ(false, wrap->persistent().IsEmpty());
   uv_close(wrap->handle__, OnClose);
   wrap->handle__ = NULL;
 
@@ -95,7 +95,7 @@ HandleWrap::HandleWrap(Environment* env,
 
 
 HandleWrap::~HandleWrap() {
-  assert(persistent().IsEmpty());
+  CHECK(persistent().IsEmpty());
   QUEUE_REMOVE(&handle_wrap_queue_);
 }
 
@@ -106,10 +106,10 @@ void HandleWrap::OnClose(uv_handle_t* handle) {
   HandleScope scope(env->isolate());
 
   // The wrap object should still be there.
-  assert(wrap->persistent().IsEmpty() == false);
+  CHECK_EQ(wrap->persistent().IsEmpty(), false);
 
   // But the handle pointer should be gone.
-  assert(wrap->handle__ == NULL);
+  CHECK_EQ(wrap->handle__, NULL);
 
   HandleScope handle_scope(env->isolate());
   Context::Scope context_scope(env->context());
diff --git a/src/node.cc b/src/node.cc
index 023ef1ee09..69fbf47edc 100644
--- a/src/node.cc
+++ b/src/node.cc
@@ -58,7 +58,6 @@
 #include "v8-profiler.h"
 #include "zlib.h"
 
-#include <assert.h>
 #include <errno.h>
 #include <limits.h>  // PATH_MAX
 #include <locale.h>
@@ -911,10 +910,10 @@ Local<Value> WinapiErrnoException(Isolate* isolate,
 void SetupAsyncListener(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
 
-  assert(args[0]->IsObject());
-  assert(args[1]->IsFunction());
-  assert(args[2]->IsFunction());
-  assert(args[3]->IsFunction());
+  CHECK(args[0]->IsObject());
+  CHECK(args[1]->IsFunction());
+  CHECK(args[2]->IsFunction());
+  CHECK(args[3]->IsFunction());
 
   env->set_async_listener_run_function(args[1].As<Function>());
   env->set_async_listener_load_function(args[2].As<Function>());
@@ -955,8 +954,8 @@ void SetupDomainUse(const FunctionCallbackInfo<Value>& args) {
   process_object->Set(env->tick_callback_string(), tick_callback_function);
   env->set_tick_callback_function(tick_callback_function);
 
-  assert(args[0]->IsArray());
-  assert(args[1]->IsObject());
+  CHECK(args[0]->IsArray());
+  CHECK(args[1]->IsObject());
 
   env->set_domain_array(args[0].As<Array>());
 
@@ -980,9 +979,9 @@ void RunMicrotasks(const FunctionCallbackInfo<Value>& args) {
 void SetupNextTick(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
 
-  assert(args[0]->IsObject());
-  assert(args[1]->IsFunction());
-  assert(args[2]->IsObject());
+  CHECK(args[0]->IsObject());
+  CHECK(args[1]->IsFunction());
+  CHECK(args[2]->IsObject());
 
   // Values use to cross communicate with processNextTick.
   Local<Object> tick_info_obj = args[0].As<Object>();
@@ -1007,7 +1006,7 @@ Handle<Value> MakeDomainCallback(Environment* env,
                                  int argc,
                                  Handle<Value> argv[]) {
   // If you hit this assertion, you forgot to enter the v8::Context first.
-  assert(env->context() == env->isolate()->GetCurrentContext());
+  CHECK_EQ(env->context(), env->isolate()->GetCurrentContext());
 
   Local<Object> process = env->process_object();
   Local<Object> object, domain;
@@ -1118,7 +1117,7 @@ Handle<Value> MakeCallback(Environment* env,
     return MakeDomainCallback(env, recv, callback, argc, argv);
 
   // If you hit this assertion, you forgot to enter the v8::Context first.
-  assert(env->context() == env->isolate()->GetCurrentContext());
+  CHECK_EQ(env->context(), env->isolate()->GetCurrentContext());
 
   Local<Object> process = env->process_object();
 
@@ -1185,7 +1184,7 @@ Handle<Value> MakeCallback(Environment* env,
                            int argc,
                            Handle<Value> argv[]) {
   Local<Function> callback = recv->Get(index).As<Function>();
-  assert(callback->IsFunction());
+  CHECK(callback->IsFunction());
 
   return MakeCallback(env, recv.As<Value>(), callback, argc, argv);
 }
@@ -1197,7 +1196,7 @@ Handle<Value> MakeCallback(Environment* env,
                            int argc,
                            Handle<Value> argv[]) {
   Local<Function> callback = recv->Get(symbol).As<Function>();
-  assert(callback->IsFunction());
+  CHECK(callback->IsFunction());
   return MakeCallback(env, recv.As<Value>(), callback, argc, argv);
 }
 
@@ -1337,7 +1336,7 @@ ssize_t DecodeBytes(Isolate* isolate,
   if (val->IsArray()) {
     fprintf(stderr, "'raw' encoding (array of integers) has been removed. "
                     "Use 'binary'.\n");
-    assert(0);
+    UNREACHABLE();
     return -1;
   }
 
@@ -1414,7 +1413,7 @@ void AppendExceptionLine(Environment* env,
                      filename_string,
                      linenum,
                      sourceline_string);
-  assert(off >= 0);
+  CHECK_GE(off, 0);
 
   // Print wavy underline (GetUnderline is deprecated).
   for (int i = 0; i < start; i++) {
@@ -1422,7 +1421,7 @@ void AppendExceptionLine(Environment* env,
         static_cast<size_t>(off) >= sizeof(arrow)) {
       break;
     }
-    assert(static_cast<size_t>(off) < sizeof(arrow));
+    CHECK_LT(static_cast<size_t>(off), sizeof(arrow));
     arrow[off++] = (sourceline_string[i] == '\t') ? '\t' : ' ';
   }
   for (int i = start; i < end; i++) {
@@ -1430,10 +1429,10 @@ void AppendExceptionLine(Environment* env,
         static_cast<size_t>(off) >= sizeof(arrow)) {
       break;
     }
-    assert(static_cast<size_t>(off) < sizeof(arrow));
+    CHECK_LT(static_cast<size_t>(off), sizeof(arrow));
     arrow[off++] = '^';
   }
-  assert(static_cast<size_t>(off - 1) <= sizeof(arrow) - 1);
+  CHECK_LE(static_cast<size_t>(off - 1), sizeof(arrow) - 1);
   arrow[off++] = '\n';
   arrow[off] = '\0';
 
@@ -2035,7 +2034,7 @@ extern "C" void node_module_register(void* m) {
     mp->nm_link = modlist_builtin;
     modlist_builtin = mp;
   } else {
-    assert(modpending == NULL);
+    CHECK_EQ(modpending, NULL);
     modpending = mp;
   }
 }
@@ -2048,7 +2047,7 @@ struct node_module* get_builtin_module(const char* name) {
       break;
   }
 
-  assert(mp == NULL || (mp->nm_flags & NM_F_BUILTIN) != 0);
+  CHECK(mp == NULL || (mp->nm_flags & NM_F_BUILTIN) != 0);
   return (mp);
 }
 
@@ -2230,8 +2229,8 @@ static void Binding(const FunctionCallbackInfo<Value>& args) {
   if (mod != NULL) {
     exports = Object::New(env->isolate());
     // Internal bindings don't have a "module" object, only exports.
-    assert(mod->nm_register_func == NULL);
-    assert(mod->nm_context_register_func != NULL);
+    CHECK_EQ(mod->nm_register_func, NULL);
+    CHECK_NE(mod->nm_context_register_func, NULL);
     Local<Value> unused = Undefined(env->isolate());
     mod->nm_context_register_func(exports, unused,
       env->context(), mod->nm_priv);
@@ -2825,8 +2824,8 @@ static void SignalExit(int signo) {
 static void RawDebug(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
 
-  assert(args.Length() == 1 && args[0]->IsString() &&
-         "must be called with a single string");
+  CHECK(args.Length() == 1 && args[0]->IsString() &&
+        "must be called with a single string");
 
   node::Utf8Value message(args[0]);
   fprintf(stderr, "%s\n", *message);
@@ -2860,7 +2859,7 @@ void LoadEnvironment(Environment* env) {
     ReportException(env, try_catch);
     exit(10);
   }
-  assert(f_value->IsFunction());
+  CHECK(f_value->IsFunction());
   Local<Function> f = Local<Function>::Cast(f_value);
 
   // Now we call 'f' with the 'process' variable that we've built up with
@@ -3675,7 +3674,7 @@ int Start(int argc, char** argv) {
   InstallEarlyDebugSignalHandler();
 #endif
 
-  assert(argc > 0);
+  CHECK_GT(argc, 0);
 
   // Hack around with the argv pointer. Used for process.title = "blah".
   argv = uv_setup_args(argc, argv);
diff --git a/src/node_buffer.cc b/src/node_buffer.cc
index ae33b03b38..90c0eb5750 100644
--- a/src/node_buffer.cc
+++ b/src/node_buffer.cc
@@ -30,7 +30,6 @@
 #include "v8-profiler.h"
 #include "v8.h"
 
-#include <assert.h>
 #include <string.h>
 #include <limits.h>
 
@@ -47,7 +46,7 @@
   char* obj_data = static_cast<char*>(                                      \
     obj->GetIndexedPropertiesExternalArrayData());                          \
   if (obj_length > 0)                                                       \
-    assert(obj_data != NULL);
+    CHECK_NE(obj_data, NULL);
 
 #define SLICE_START_END(start_arg, end_arg, end_max)                        \
   size_t start;                                                             \
@@ -91,7 +90,7 @@ bool HasInstance(Handle<Object> obj) {
 
 
 char* Data(Handle<Value> val) {
-  assert(val->IsObject());
+  CHECK(val->IsObject());
   // Use a fully qualified name here to work around a bug in gcc 4.2.
   // It mistakes an unadorned call to Data() for the v8::String::Data type.
   return node::Buffer::Data(val.As<Object>());
@@ -99,19 +98,19 @@ char* Data(Handle<Value> val) {
 
 
 char* Data(Handle<Object> obj) {
-  assert(obj->HasIndexedPropertiesInExternalArrayData());
+  CHECK(obj->HasIndexedPropertiesInExternalArrayData());
   return static_cast<char*>(obj->GetIndexedPropertiesExternalArrayData());
 }
 
 
 size_t Length(Handle<Value> val) {
-  assert(val->IsObject());
+  CHECK(val->IsObject());
   return Length(val.As<Object>());
 }
 
 
 size_t Length(Handle<Object> obj) {
-  assert(obj->HasIndexedPropertiesInExternalArrayData());
+  CHECK(obj->HasIndexedPropertiesInExternalArrayData());
   return obj->GetIndexedPropertiesExternalArrayDataLength();
 }
 
@@ -141,7 +140,7 @@ Local<Object> New(Isolate* isolate, size_t length) {
 Local<Object> New(Environment* env, size_t length) {
   EscapableHandleScope scope(env->isolate());
 
-  assert(length <= kMaxLength);
+  CHECK_LE(length, kMaxLength);
 
   Local<Value> arg = Uint32::NewFromUnsigned(env->isolate(), length);
   Local<Object> obj = env->buffer_constructor_function()->NewInstance(1, &arg);
@@ -177,7 +176,7 @@ Local<Object> New(Isolate* isolate, const char* data, size_t length) {
 Local<Object> New(Environment* env, const char* data, size_t length) {
   EscapableHandleScope scope(env->isolate());
 
-  assert(length <= kMaxLength);
+  CHECK_LE(length, kMaxLength);
 
   Local<Value> arg = Uint32::NewFromUnsigned(env->isolate(), length);
   Local<Object> obj = env->buffer_constructor_function()->NewInstance(1, &arg);
@@ -220,7 +219,7 @@ Local<Object> New(Environment* env,
                   void* hint) {
   EscapableHandleScope scope(env->isolate());
 
-  assert(length <= kMaxLength);
+  CHECK_LE(length, kMaxLength);
 
   Local<Value> arg = Uint32::NewFromUnsigned(env->isolate(), length);
   Local<Object> obj = env->buffer_constructor_function()->NewInstance(1, &arg);
@@ -242,7 +241,7 @@ Local<Object> Use(Isolate* isolate, char* data, uint32_t length) {
 Local<Object> Use(Environment* env, char* data, uint32_t length) {
   EscapableHandleScope scope(env->isolate());
 
-  assert(length <= kMaxLength);
+  CHECK_LE(length, kMaxLength);
 
   Local<Value> arg = Uint32::NewFromUnsigned(env->isolate(), length);
   Local<Object> obj = env->buffer_constructor_function()->NewInstance(1, &arg);
@@ -591,13 +590,13 @@ void Compare(const FunctionCallbackInfo<Value> &args) {
 void SetupBufferJS(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
 
-  assert(args[0]->IsFunction());
+  CHECK(args[0]->IsFunction());
 
   Local<Function> bv = args[0].As<Function>();
   env->set_buffer_constructor_function(bv);
   Local<Value> proto_v = bv->Get(env->prototype_string());
 
-  assert(proto_v->IsObject());
+  CHECK(proto_v->IsObject());
 
   Local<Object> proto = proto_v.As<Object>();
 
@@ -622,7 +621,7 @@ void SetupBufferJS(const FunctionCallbackInfo<Value>& args) {
                   Uint32::New(env->isolate(), 0),
                   v8::ReadOnly);
 
-  assert(args[1]->IsObject());
+  CHECK(args[1]->IsObject());
 
   Local<Object> internal = args[1].As<Object>();
   ASSERT(internal->IsObject());
diff --git a/src/node_contextify.cc b/src/node_contextify.cc
index bb7f4f1f37..89217386ad 100644
--- a/src/node_contextify.cc
+++ b/src/node_contextify.cc
@@ -184,7 +184,7 @@ class ContextifyContext {
               "binding:script");
           Local<Script> script = Script::Compile(code, fname);
           clone_property_method = Local<Function>::Cast(script->Run());
-          assert(clone_property_method->IsFunction());
+          CHECK(clone_property_method->IsFunction());
         }
         Local<Value> args[] = { global, key, sandbox };
         clone_property_method->Call(global, ARRAY_SIZE(args), args);
@@ -276,7 +276,7 @@ class ContextifyContext {
         FIXED_ONE_BYTE_STRING(env->isolate(), "_contextifyHidden");
 
     // Don't allow contextifying a sandbox multiple times.
-    assert(sandbox->GetHiddenValue(hidden_name).IsEmpty());
+    CHECK(sandbox->GetHiddenValue(hidden_name).IsEmpty());
 
     TryCatch try_catch;
     ContextifyContext* context = new ContextifyContext(env, sandbox);
diff --git a/src/node_crypto.cc b/src/node_crypto.cc
index 7e7ff232b7..854fc156f4 100644
--- a/src/node_crypto.cc
+++ b/src/node_crypto.cc
@@ -168,8 +168,8 @@ static void crypto_lock_init(void) {
 
 
 static void crypto_lock_cb(int mode, int n, const char* file, int line) {
-  assert((mode & CRYPTO_LOCK) || (mode & CRYPTO_UNLOCK));
-  assert((mode & CRYPTO_READ) || (mode & CRYPTO_WRITE));
+  CHECK((mode & CRYPTO_LOCK) || (mode & CRYPTO_UNLOCK));
+  CHECK((mode & CRYPTO_READ) || (mode & CRYPTO_WRITE));
 
   if (mode & CRYPTO_LOCK) {
     if (mode & CRYPTO_READ)
@@ -669,7 +669,7 @@ void SecureContext::AddCRL(const FunctionCallbackInfo<Value>& args) {
 void SecureContext::AddRootCerts(const FunctionCallbackInfo<Value>& args) {
   SecureContext* sc = Unwrap<SecureContext>(args.Holder());
 
-  assert(sc->ca_store_ == NULL);
+  CHECK_EQ(sc->ca_store_, NULL);
 
   if (!root_cert_store) {
     root_cert_store = X509_STORE_new();
@@ -1149,10 +1149,10 @@ static Local<Object> X509ToObject(Environment* env, X509* cert) {
     int rv;
 
     ext = X509_get_ext(cert, index);
-    assert(ext != NULL);
+    CHECK_NE(ext, NULL);
 
     rv = X509V3_EXT_print(bio, ext, 0, 0);
-    assert(rv == 1);
+    CHECK_EQ(rv, 1);
 
     BIO_get_mem_ptr(bio, &mem);
     info->Set(keys[i],
@@ -1386,7 +1386,7 @@ void SSLWrap<Base>::GetSession(const FunctionCallbackInfo<Value>& args) {
     return;
 
   int slen = i2d_SSL_SESSION(sess, NULL);
-  assert(slen > 0);
+  CHECK_GT(slen, 0);
 
   unsigned char* sbuf = new unsigned char[slen];
   unsigned char* p = sbuf;
@@ -1806,7 +1806,7 @@ int SSLWrap<Base>::TLSExtStatusCallback(SSL* s, void* arg) {
 
     // OpenSSL takes control of the pointer after accepting it
     char* data = reinterpret_cast<char*>(malloc(len));
-    assert(data != NULL);
+    CHECK_NE(data, NULL);
     memcpy(data, resp, len);
 
     if (!SSL_set_tlsext_status_ocsp_resp(s, data, len))
@@ -1930,7 +1930,7 @@ int Connection::HandleSSLError(const char* func,
     BUF_MEM* mem;
     BIO *bio;
 
-    assert(err == SSL_ERROR_SSL || err == SSL_ERROR_SYSCALL);
+    CHECK(err == SSL_ERROR_SSL || err == SSL_ERROR_SYSCALL);
 
     // XXX We need to drain the error queue for this thread or else OpenSSL
     // has the possibility of blocking connections? This problem is not well
@@ -1963,7 +1963,7 @@ void Connection::ClearError() {
   // We should clear the error in JS-land
   Local<String> error_key = ssl_env()->error_string();
   Local<Value> error = object()->Get(error_key);
-  assert(error->BooleanValue() == false);
+  CHECK_EQ(error->BooleanValue(), false);
 #endif  // NDEBUG
 }
 
@@ -2477,7 +2477,7 @@ void CipherBase::Initialize(Environment* env, Handle<Object> target) {
 
 
 void CipherBase::New(const FunctionCallbackInfo<Value>& args) {
-  assert(args.IsConstructCall() == true);
+  CHECK_EQ(args.IsConstructCall(), true);
   CipherKind kind = args[0]->IsTrue() ? kCipher : kDecipher;
   Environment* env = Environment::GetCurrent(args.GetIsolate());
   new CipherBase(env, args.This(), kind);
@@ -2489,7 +2489,7 @@ void CipherBase::Init(const char* cipher_type,
                       int key_buf_len) {
   HandleScope scope(env()->isolate());
 
-  assert(cipher_ == NULL);
+  CHECK_EQ(cipher_, NULL);
   cipher_ = EVP_get_cipherbyname(cipher_type);
   if (cipher_ == NULL) {
     return env()->ThrowError("Unknown cipher");
@@ -2851,7 +2851,7 @@ void Hmac::New(const FunctionCallbackInfo<Value>& args) {
 void Hmac::HmacInit(const char* hash_type, const char* key, int key_len) {
   HandleScope scope(env()->isolate());
 
-  assert(md_ == NULL);
+  CHECK_EQ(md_, NULL);
   md_ = EVP_get_digestbyname(hash_type);
   if (md_ == NULL) {
     return env()->ThrowError("Unknown message digest");
@@ -2994,7 +2994,7 @@ void Hash::New(const FunctionCallbackInfo<Value>& args) {
 
 
 bool Hash::HashInit(const char* hash_type) {
-  assert(md_ == NULL);
+  CHECK_EQ(md_, NULL);
   md_ = EVP_get_digestbyname(hash_type);
   if (md_ == NULL)
     return false;
@@ -3137,7 +3137,7 @@ void Sign::New(const FunctionCallbackInfo<Value>& args) {
 
 
 SignBase::Error Sign::SignInit(const char* sign_type) {
-  assert(md_ == NULL);
+  CHECK_EQ(md_, NULL);
   md_ = EVP_get_digestbyname(sign_type);
   if (!md_)
     return kSignUnknownDigest;
@@ -3314,7 +3314,7 @@ void Verify::New(const FunctionCallbackInfo<Value>& args) {
 
 
 SignBase::Error Verify::VerifyInit(const char* verify_type) {
-  assert(md_ == NULL);
+  CHECK_EQ(md_, NULL);
   md_ = EVP_get_digestbyname(verify_type);
   if (md_ == NULL)
     return kSignUnknownDigest;
@@ -3485,7 +3485,7 @@ void Verify::VerifyFinal(const FunctionCallbackInfo<Value>& args) {
                                           hlen,
                                           args[1],
                                           encoding);
-    assert(hwritten == hlen);
+    CHECK_EQ(hwritten, hlen);
   } else {
     hbuf = Buffer::Data(args[1]);
   }
@@ -3943,14 +3943,14 @@ void DiffieHellman::ComputeSecret(const FunctionCallbackInfo<Value>& args) {
   }
 
   BN_free(key);
-  assert(size >= 0);
+  CHECK_GE(size, 0);
 
   // DH_size returns number of bytes in a prime number
   // DH_compute_key returns number of bytes in a remainder of exponent, which
   // may have less bytes than a prime number. Therefore add 0-padding to the
   // allocated buffer.
   if (size != dataSize) {
-    assert(dataSize > size);
+    CHECK(dataSize > size);
     memmove(data + dataSize - size, data, size);
     memset(data, 0, dataSize - size);
   }
@@ -4363,7 +4363,7 @@ void EIO_PBKDF2After(PBKDF2Request* req, Local<Value> argv[2]) {
 
 
 void EIO_PBKDF2After(uv_work_t* work_req, int status) {
-  assert(status == 0);
+  CHECK_EQ(status, 0);
   PBKDF2Request* req = ContainerOf(&PBKDF2Request::work_req_, work_req);
   Environment* env = req->env();
   HandleScope handle_scope(env->isolate());
@@ -4600,7 +4600,7 @@ void RandomBytesCheck(RandomBytesRequest* req, Local<Value> argv[2]) {
 
 
 void RandomBytesAfter(uv_work_t* work_req, int status) {
-  assert(status == 0);
+  CHECK_EQ(status, 0);
   RandomBytesRequest* req =
       ContainerOf(&RandomBytesRequest::work_req_, work_req);
   Environment* env = req->env();
@@ -4789,7 +4789,7 @@ void Certificate::VerifySpkac(const FunctionCallbackInfo<Value>& args) {
     return args.GetReturnValue().Set(i);
 
   char* data = Buffer::Data(args[0]);
-  assert(data != NULL);
+  CHECK_NE(data, NULL);
 
   i = certificate->VerifySpkac(data, length);
 
@@ -4853,7 +4853,7 @@ void Certificate::ExportPublicKey(const FunctionCallbackInfo<Value>& args) {
     return args.GetReturnValue().SetEmptyString();
 
   char* data = Buffer::Data(args[0]);
-  assert(data != NULL);
+  CHECK_NE(data, NULL);
 
   const char* pkey = certificate->ExportPublicKey(data, length);
   if (pkey == NULL)
@@ -4896,7 +4896,7 @@ void Certificate::ExportChallenge(const FunctionCallbackInfo<Value>& args) {
     return args.GetReturnValue().SetEmptyString();
 
   char* data = Buffer::Data(args[0]);
-  assert(data != NULL);
+  CHECK_NE(data, NULL);
 
   const char* cert = crt->ExportChallenge(data, len);
   if (cert == NULL)
@@ -4927,7 +4927,7 @@ void InitCryptoOnce() {
   STACK_OF(SSL_COMP)* comp_methods = SSL_COMP_get_compression_methods();
 #endif
   sk_SSL_COMP_zero(comp_methods);
-  assert(sk_SSL_COMP_num(comp_methods) == 0);
+  CHECK_EQ(sk_SSL_COMP_num(comp_methods), 0);
 #endif
 
 #ifndef OPENSSL_NO_ENGINE
diff --git a/src/node_crypto.h b/src/node_crypto.h
index 1a719b9058..12b5eafb18 100644
--- a/src/node_crypto.h
+++ b/src/node_crypto.h
@@ -139,7 +139,7 @@ class SecureContext : public BaseObject {
       cert_ = NULL;
       issuer_ = NULL;
     } else {
-      assert(ca_store_ == NULL);
+      CHECK_EQ(ca_store_, NULL);
     }
   }
 };
@@ -161,7 +161,7 @@ class SSLWrap {
         session_callbacks_(false),
         new_session_wait_(false) {
     ssl_ = SSL_new(sc->ctx_);
-    assert(ssl_ != NULL);
+    CHECK_NE(ssl_, NULL);
   }
 
   ~SSLWrap() {
diff --git a/src/node_crypto_bio.cc b/src/node_crypto_bio.cc
index 441e9b17f7..16ec515de9 100644
--- a/src/node_crypto_bio.cc
+++ b/src/node_crypto_bio.cc
@@ -21,6 +21,8 @@
 
 #include "node_crypto_bio.h"
 #include "openssl/bio.h"
+#include "util.h"
+#include "util-inl.h"
 #include <string.h>
 
 namespace node {
@@ -185,11 +187,11 @@ long NodeBIO::Ctrl(BIO* bio, int cmd, long num, void* ptr) {
         *reinterpret_cast<void**>(ptr) = NULL;
       break;
     case BIO_C_SET_BUF_MEM:
-      assert(0 && "Can't use SET_BUF_MEM_PTR with NodeBIO");
+      CHECK(0 && "Can't use SET_BUF_MEM_PTR with NodeBIO");
       abort();
       break;
     case BIO_C_GET_BUF_MEM_PTR:
-      assert(0 && "Can't use GET_BUF_MEM_PTR with NodeBIO");
+      CHECK(0 && "Can't use GET_BUF_MEM_PTR with NodeBIO");
       ret = 0;
       break;
     case BIO_CTRL_GET_CLOSE:
@@ -244,7 +246,7 @@ size_t NodeBIO::Read(char* out, size_t size) {
   size_t left = size;
 
   while (bytes_read < expected) {
-    assert(read_head_->read_pos_ <= read_head_->write_pos_);
+    CHECK_LE(read_head_->read_pos_, read_head_->write_pos_);
     size_t avail = read_head_->write_pos_ - read_head_->read_pos_;
     if (avail > left)
       avail = left;
@@ -261,7 +263,7 @@ size_t NodeBIO::Read(char* out, size_t size) {
 
     TryMoveReadHead();
   }
-  assert(expected == bytes_read);
+  CHECK_EQ(expected, bytes_read);
   length_ -= bytes_read;
 
   // Free all empty buffers, but write_head's child
@@ -283,8 +285,8 @@ void NodeBIO::FreeEmpty() {
 
   Buffer* prev = child;
   while (cur != read_head_) {
-    assert(cur != write_head_);
-    assert(cur->write_pos_ == cur->read_pos_);
+    CHECK_NE(cur, write_head_);
+    CHECK_EQ(cur->write_pos_, cur->read_pos_);
 
     Buffer* next = cur->next_;
     delete cur;
@@ -301,7 +303,7 @@ size_t NodeBIO::IndexOf(char delim, size_t limit) {
   Buffer* current = read_head_;
 
   while (bytes_read < max) {
-    assert(current->read_pos_ <= current->write_pos_);
+    CHECK_LE(current->read_pos_, current->write_pos_);
     size_t avail = current->write_pos_ - current->read_pos_;
     if (avail > left)
       avail = left;
@@ -328,7 +330,7 @@ size_t NodeBIO::IndexOf(char delim, size_t limit) {
       current = current->next_;
     }
   }
-  assert(max == bytes_read);
+  CHECK_EQ(max, bytes_read);
 
   return max;
 }
@@ -343,7 +345,7 @@ void NodeBIO::Write(const char* data, size_t size) {
 
   while (left > 0) {
     size_t to_write = left;
-    assert(write_head_->write_pos_ <= write_head_->len_);
+    CHECK_LE(write_head_->write_pos_, write_head_->len_);
     size_t avail = write_head_->len_ - write_head_->write_pos_;
 
     if (to_write > avail)
@@ -359,11 +361,11 @@ void NodeBIO::Write(const char* data, size_t size) {
     offset += to_write;
     length_ += to_write;
     write_head_->write_pos_ += to_write;
-    assert(write_head_->write_pos_ <= write_head_->len_);
+    CHECK_LE(write_head_->write_pos_, write_head_->len_);
 
     // Go to next buffer if there still are some bytes to write
     if (left != 0) {
-      assert(write_head_->write_pos_ == write_head_->len_);
+      CHECK_EQ(write_head_->write_pos_, write_head_->len_);
       TryAllocateForWrite(left);
       write_head_ = write_head_->next_;
 
@@ -372,7 +374,7 @@ void NodeBIO::Write(const char* data, size_t size) {
       TryMoveReadHead();
     }
   }
-  assert(left == 0);
+  CHECK_EQ(left, 0);
 }
 
 
@@ -392,7 +394,7 @@ char* NodeBIO::PeekWritable(size_t* size) {
 void NodeBIO::Commit(size_t size) {
   write_head_->write_pos_ += size;
   length_ += size;
-  assert(write_head_->write_pos_ <= write_head_->len_);
+  CHECK_LE(write_head_->write_pos_, write_head_->len_);
 
   // Allocate new buffer if write head is full,
   // and there're no other place to go
@@ -437,7 +439,7 @@ void NodeBIO::Reset() {
     return;
 
   while (read_head_->read_pos_ != read_head_->write_pos_) {
-    assert(read_head_->write_pos_ > read_head_->read_pos_);
+    CHECK(read_head_->write_pos_ > read_head_->read_pos_);
 
     length_ -= read_head_->write_pos_ - read_head_->read_pos_;
     read_head_->write_pos_ = 0;
@@ -446,7 +448,7 @@ void NodeBIO::Reset() {
     read_head_ = read_head_->next_;
   }
   write_head_ = read_head_;
-  assert(length_ == 0);
+  CHECK_EQ(length_, 0);
 }
 
 
diff --git a/src/node_crypto_bio.h b/src/node_crypto_bio.h
index 163a82124f..1f5657fbf1 100644
--- a/src/node_crypto_bio.h
+++ b/src/node_crypto_bio.h
@@ -23,7 +23,8 @@
 #define SRC_NODE_CRYPTO_BIO_H_
 
 #include "openssl/bio.h"
-#include <assert.h>
+#include "util.h"
+#include "util-inl.h"
 
 namespace node {
 
@@ -88,7 +89,7 @@ class NodeBIO {
   }
 
   static inline NodeBIO* FromBIO(BIO* bio) {
-    assert(bio->ptr != NULL);
+    CHECK_NE(bio->ptr, NULL);
     return static_cast<NodeBIO*>(bio->ptr);
   }
 
diff --git a/src/node_crypto_clienthello-inl.h b/src/node_crypto_clienthello-inl.h
index 7b735dd775..6402b4ed4b 100644
--- a/src/node_crypto_clienthello-inl.h
+++ b/src/node_crypto_clienthello-inl.h
@@ -22,7 +22,8 @@
 #ifndef SRC_NODE_CRYPTO_CLIENTHELLO_INL_H_
 #define SRC_NODE_CRYPTO_CLIENTHELLO_INL_H_
 
-#include <assert.h>
+#include "util.h"
+#include "util-inl.h"
 
 namespace node {
 
@@ -45,7 +46,7 @@ inline void ClientHelloParser::Start(ClientHelloParser::OnHelloCb onhello_cb,
     return;
   Reset();
 
-  assert(onhello_cb != NULL);
+  CHECK_NE(onhello_cb, NULL);
 
   state_ = kWaiting;
   onhello_cb_ = onhello_cb;
diff --git a/src/node_file.cc b/src/node_file.cc
index 268fe4c916..56d7b35b4b 100644
--- a/src/node_file.cc
+++ b/src/node_file.cc
@@ -34,7 +34,6 @@
 #include <fcntl.h>
 #include <sys/types.h>
 #include <sys/stat.h>
-#include <assert.h>
 #include <string.h>
 #include <errno.h>
 #include <limits.h>
@@ -116,7 +115,7 @@ static inline bool IsInt64(double x) {
 
 static void After(uv_fs_t *req) {
   FSReqWrap* req_wrap = static_cast<FSReqWrap*>(req->data);
-  assert(&req_wrap->req_ == req);
+  CHECK_EQ(&req_wrap->req_, req);
   req_wrap->ReleaseEarly();  // Free memory that's no longer used now.
 
   Environment* env = req_wrap->env();
@@ -234,7 +233,7 @@ static void After(uv_fs_t *req) {
         break;
 
       default:
-        assert(0 && "Unhandled eio response");
+        CHECK(0 && "Unhandled eio response");
     }
   }
 
@@ -330,7 +329,7 @@ static void Close(const FunctionCallbackInfo<Value>& args) {
 
 Local<Value> BuildStatsObject(Environment* env, const uv_stat_t* s) {
   // If you hit this assertion, you forgot to enter the v8::Context first.
-  assert(env->context() == env->isolate()->GetCurrentContext());
+  CHECK_EQ(env->context(), env->isolate()->GetCurrentContext());
 
   EscapableHandleScope handle_scope(env->isolate());
 
@@ -699,7 +698,7 @@ static void ReadDir(const FunctionCallbackInfo<Value>& args) {
   } else {
     SYNC_CALL(readdir, *path, *path, 0 /*flags*/)
 
-    assert(SYNC_REQ.result >= 0);
+    CHECK_GE(SYNC_REQ.result, 0);
     int r;
     Local<Array> names = Array::New(env->isolate(), 0);
 
@@ -763,8 +762,8 @@ static void Open(const FunctionCallbackInfo<Value>& args) {
 static void WriteBuffer(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
 
-  assert(args[0]->IsInt32());
-  assert(Buffer::HasInstance(args[1]));
+  CHECK(args[0]->IsInt32());
+  CHECK(Buffer::HasInstance(args[1]));
 
   int fd = args[0]->Int32Value();
   Local<Object> obj = args[1].As<Object>();
@@ -1090,7 +1089,7 @@ static void FUTimes(const FunctionCallbackInfo<Value>& args) {
 
 void FSInitialize(const FunctionCallbackInfo<Value>& args) {
   Local<Function> stats_constructor = args[0].As<Function>();
-  assert(stats_constructor->IsFunction());
+  CHECK(stats_constructor->IsFunction());
 
   Environment* env = Environment::GetCurrent(args.GetIsolate());
   env->set_fs_stats_constructor_function(stats_constructor);
diff --git a/src/node_http_parser.cc b/src/node_http_parser.cc
index 49e19290dc..dc25e8c760 100644
--- a/src/node_http_parser.cc
+++ b/src/node_http_parser.cc
@@ -213,8 +213,8 @@ class Parser : public BaseObject {
       fields_[num_fields_ - 1].Reset();
     }
 
-    assert(num_fields_ < static_cast<int>(ARRAY_SIZE(fields_)));
-    assert(num_fields_ == num_values_ + 1);
+    CHECK_LT(num_fields_, static_cast<int>(ARRAY_SIZE(fields_)));
+    CHECK_EQ(num_fields_, num_values_ + 1);
 
     fields_[num_fields_ - 1].Update(at, length);
 
@@ -229,8 +229,8 @@ class Parser : public BaseObject {
       values_[num_values_ - 1].Reset();
     }
 
-    assert(num_values_ < static_cast<int>(ARRAY_SIZE(values_)));
-    assert(num_values_ == num_fields_);
+    CHECK_LT(num_values_, static_cast<int>(ARRAY_SIZE(values_)));
+    CHECK_EQ(num_values_, num_fields_);
 
     values_[num_values_ - 1].Update(at, length);
 
@@ -353,7 +353,7 @@ class Parser : public BaseObject {
     Environment* env = Environment::GetCurrent(args.GetIsolate());
     http_parser_type type =
         static_cast<http_parser_type>(args[0]->Int32Value());
-    assert(type == HTTP_REQUEST || type == HTTP_RESPONSE);
+    CHECK(type == HTTP_REQUEST || type == HTTP_RESPONSE);
     new Parser(env, args.This(), type);
   }
 
@@ -383,10 +383,10 @@ class Parser : public BaseObject {
     Environment* env = Environment::GetCurrent(args.GetIsolate());
 
     Parser* parser = Unwrap<Parser>(args.Holder());
-    assert(parser->current_buffer_.IsEmpty());
-    assert(parser->current_buffer_len_ == 0);
-    assert(parser->current_buffer_data_ == NULL);
-    assert(Buffer::HasInstance(args[0]) == true);
+    CHECK(parser->current_buffer_.IsEmpty());
+    CHECK_EQ(parser->current_buffer_len_, 0);
+    CHECK_EQ(parser->current_buffer_data_, NULL);
+    CHECK_EQ(Buffer::HasInstance(args[0]), true);
 
     Local<Object> buffer_obj = args[0].As<Object>();
     char* buffer_data = Buffer::Data(buffer_obj);
@@ -438,7 +438,7 @@ class Parser : public BaseObject {
 
     Parser* parser = Unwrap<Parser>(args.Holder());
 
-    assert(parser->current_buffer_.IsEmpty());
+    CHECK(parser->current_buffer_.IsEmpty());
     parser->got_exception_ = false;
 
     int rv = http_parser_execute(&(parser->parser_), &settings, NULL, 0);
@@ -466,10 +466,10 @@ class Parser : public BaseObject {
     http_parser_type type =
         static_cast<http_parser_type>(args[0]->Int32Value());
 
-    assert(type == HTTP_REQUEST || type == HTTP_RESPONSE);
+    CHECK(type == HTTP_REQUEST || type == HTTP_RESPONSE);
     Parser* parser = Unwrap<Parser>(args.Holder());
     // Should always be called from the same context.
-    assert(env == parser->env());
+    CHECK_EQ(env, parser->env());
     parser->Init(type);
   }
 
@@ -479,7 +479,7 @@ class Parser : public BaseObject {
     Environment* env = Environment::GetCurrent(args.GetIsolate());
     Parser* parser = Unwrap<Parser>(args.Holder());
     // Should always be called from the same context.
-    assert(env == parser->env());
+    CHECK_EQ(env, parser->env());
     http_parser_pause(&parser->parser_, should_pause);
   }
 
diff --git a/src/node_internals.h b/src/node_internals.h
index 253bd38d96..2caa81ce18 100644
--- a/src/node_internals.h
+++ b/src/node_internals.h
@@ -28,7 +28,6 @@
 #include "uv.h"
 #include "v8.h"
 
-#include <assert.h>
 #include <stdint.h>
 #include <stdlib.h>
 
diff --git a/src/node_stat_watcher.cc b/src/node_stat_watcher.cc
index 731740350c..3d6c4b189d 100644
--- a/src/node_stat_watcher.cc
+++ b/src/node_stat_watcher.cc
@@ -27,7 +27,6 @@
 #include "util.h"
 #include "util-inl.h"
 
-#include <assert.h>
 #include <string.h>
 #include <stdlib.h>
 
@@ -85,7 +84,7 @@ void StatWatcher::Callback(uv_fs_poll_t* handle,
                            const uv_stat_t* prev,
                            const uv_stat_t* curr) {
   StatWatcher* wrap = static_cast<StatWatcher*>(handle->data);
-  assert(wrap->watcher_ == handle);
+  CHECK_EQ(wrap->watcher_, handle);
   Environment* env = wrap->env();
   HandleScope handle_scope(env->isolate());
   Context::Scope context_scope(env->context());
@@ -99,14 +98,14 @@ void StatWatcher::Callback(uv_fs_poll_t* handle,
 
 
 void StatWatcher::New(const FunctionCallbackInfo<Value>& args) {
-  assert(args.IsConstructCall());
+  CHECK(args.IsConstructCall());
   Environment* env = Environment::GetCurrent(args.GetIsolate());
   new StatWatcher(env, args.This());
 }
 
 
 void StatWatcher::Start(const FunctionCallbackInfo<Value>& args) {
-  assert(args.Length() == 3);
+  CHECK_EQ(args.Length(), 3);
 
   StatWatcher* wrap = Unwrap<StatWatcher>(args.Holder());
   node::Utf8Value path(args[0]);
diff --git a/src/node_watchdog.cc b/src/node_watchdog.cc
index a71a906d70..65e7b27234 100644
--- a/src/node_watchdog.cc
+++ b/src/node_watchdog.cc
@@ -23,7 +23,6 @@
 #include "env.h"
 #include "env-inl.h"
 #include "util.h"
-#include <assert.h>
 
 namespace node {
 
diff --git a/src/node_win32_etw_provider-inl.h b/src/node_win32_etw_provider-inl.h
index 02743bc846..0bc2170767 100644
--- a/src/node_win32_etw_provider-inl.h
+++ b/src/node_win32_etw_provider-inl.h
@@ -113,7 +113,7 @@ extern int events_enabled;
                              sizeof(dataDescriptors) /                        \
                                  sizeof(*dataDescriptors),                    \
                              dataDescriptors);                                \
-  assert(status == ERROR_SUCCESS);
+  CHECK_EQ(status, ERROR_SUCCESS);
 
 
 void NODE_HTTP_SERVER_REQUEST(node_dtrace_http_server_request_t* req,
diff --git a/src/node_win32_etw_provider.cc b/src/node_win32_etw_provider.cc
index 94e70da4a5..849ea764e4 100644
--- a/src/node_win32_etw_provider.cc
+++ b/src/node_win32_etw_provider.cc
@@ -183,7 +183,7 @@ void init_etw() {
                                     etw_events_enable_callback,
                                     NULL,
                                     &node_provider);
-      assert(status == ERROR_SUCCESS);
+      CHECK_EQ(status, ERROR_SUCCESS);
     }
   }
 }
diff --git a/src/node_zlib.cc b/src/node_zlib.cc
index 4a0161dcb6..45ef0b25f6 100644
--- a/src/node_zlib.cc
+++ b/src/node_zlib.cc
@@ -94,7 +94,7 @@ class ZCtx : public AsyncWrap {
 
 
   ~ZCtx() {
-    assert(!write_in_progress_ && "write in progress");
+    CHECK_EQ(false, write_in_progress_ && "write in progress");
     Close();
   }
 
@@ -105,8 +105,8 @@ class ZCtx : public AsyncWrap {
     }
 
     pending_close_ = false;
-    assert(init_done_ && "close before init");
-    assert(mode_ <= UNZIP);
+    CHECK(init_done_ && "close before init");
+    CHECK_LE(mode_, UNZIP);
 
     if (mode_ == DEFLATE || mode_ == GZIP || mode_ == DEFLATERAW) {
       (void)deflateEnd(&strm_);
@@ -136,18 +136,18 @@ class ZCtx : public AsyncWrap {
   // write(flush, in, in_off, in_len, out, out_off, out_len)
   template <bool async>
   static void Write(const FunctionCallbackInfo<Value>& args) {
-    assert(args.Length() == 7);
+    CHECK_EQ(args.Length(), 7);
 
     ZCtx* ctx = Unwrap<ZCtx>(args.Holder());
-    assert(ctx->init_done_ && "write before init");
-    assert(ctx->mode_ != NONE && "already finalized");
+    CHECK(ctx->init_done_ && "write before init");
+    CHECK(ctx->mode_ != NONE && "already finalized");
 
-    assert(!ctx->write_in_progress_ && "write already in progress");
-    assert(!ctx->pending_close_ && "close is pending");
+    CHECK_EQ(false, ctx->write_in_progress_ && "write already in progress");
+    CHECK_EQ(false, ctx->pending_close_ && "close is pending");
     ctx->write_in_progress_ = true;
     ctx->Ref();
 
-    assert(!args[0]->IsUndefined() && "must provide flush value");
+    CHECK_EQ(false, args[0]->IsUndefined() && "must provide flush value");
 
     unsigned int flush = args[0]->Uint32Value();
 
@@ -157,7 +157,7 @@ class ZCtx : public AsyncWrap {
         flush != Z_FULL_FLUSH &&
         flush != Z_FINISH &&
         flush != Z_BLOCK) {
-      assert(0 && "Invalid flush value");
+      CHECK(0 && "Invalid flush value");
     }
 
     Bytef *in;
@@ -171,21 +171,21 @@ class ZCtx : public AsyncWrap {
       in_len = 0;
       in_off = 0;
     } else {
-      assert(Buffer::HasInstance(args[1]));
+      CHECK(Buffer::HasInstance(args[1]));
       Local<Object> in_buf;
       in_buf = args[1]->ToObject();
       in_off = args[2]->Uint32Value();
       in_len = args[3]->Uint32Value();
 
-      assert(Buffer::IsWithinBounds(in_off, in_len, Buffer::Length(in_buf)));
+      CHECK(Buffer::IsWithinBounds(in_off, in_len, Buffer::Length(in_buf)));
       in = reinterpret_cast<Bytef *>(Buffer::Data(in_buf) + in_off);
     }
 
-    assert(Buffer::HasInstance(args[4]));
+    CHECK(Buffer::HasInstance(args[4]));
     Local<Object> out_buf = args[4]->ToObject();
     out_off = args[5]->Uint32Value();
     out_len = args[6]->Uint32Value();
-    assert(Buffer::IsWithinBounds(out_off, out_len, Buffer::Length(out_buf)));
+    CHECK(Buffer::IsWithinBounds(out_off, out_len, Buffer::Length(out_buf)));
     out = reinterpret_cast<Bytef *>(Buffer::Data(out_buf) + out_off);
 
     // build up the work request
@@ -276,7 +276,7 @@ class ZCtx : public AsyncWrap {
         }
         break;
       default:
-        assert(0 && "wtf?");
+        CHECK(0 && "wtf?");
     }
 
     // pass any errors back to the main thread to deal with.
@@ -313,7 +313,7 @@ class ZCtx : public AsyncWrap {
 
   // v8 land!
   static void After(uv_work_t* work_req, int status) {
-    assert(status == 0);
+    CHECK_EQ(status, 0);
 
     ZCtx* ctx = ContainerOf(&ZCtx::work_req_, work_req);
     Environment* env = ctx->env();
@@ -344,7 +344,7 @@ class ZCtx : public AsyncWrap {
     Environment* env = ctx->env();
 
     // If you hit this assertion, you forgot to enter the v8::Context first.
-    assert(env->context() == env->isolate()->GetCurrentContext());
+    CHECK_EQ(env->context(), env->isolate()->GetCurrentContext());
 
     if (ctx->strm_.msg != NULL) {
       message = ctx->strm_.msg;
@@ -383,22 +383,22 @@ class ZCtx : public AsyncWrap {
   static void Init(const FunctionCallbackInfo<Value>& args) {
     Environment* env = Environment::GetCurrent(args.GetIsolate());
 
-    assert((args.Length() == 4 || args.Length() == 5) &&
+    CHECK((args.Length() == 4 || args.Length() == 5) &&
            "init(windowBits, level, memLevel, strategy, [dictionary])");
 
     ZCtx* ctx = Unwrap<ZCtx>(args.Holder());
 
     int windowBits = args[0]->Uint32Value();
-    assert((windowBits >= 8 && windowBits <= 15) && "invalid windowBits");
+    CHECK((windowBits >= 8 && windowBits <= 15) && "invalid windowBits");
 
     int level = args[1]->Int32Value();
-    assert((level >= -1 && level <= 9) && "invalid compression level");
+    CHECK((level >= -1 && level <= 9) && "invalid compression level");
 
     int memLevel = args[2]->Uint32Value();
-    assert((memLevel >= 1 && memLevel <= 9) && "invalid memlevel");
+    CHECK((memLevel >= 1 && memLevel <= 9) && "invalid memlevel");
 
     int strategy = args[3]->Uint32Value();
-    assert((strategy == Z_FILTERED ||
+    CHECK((strategy == Z_FILTERED ||
             strategy == Z_HUFFMAN_ONLY ||
             strategy == Z_RLE ||
             strategy == Z_FIXED ||
@@ -423,7 +423,7 @@ class ZCtx : public AsyncWrap {
   static void Params(const FunctionCallbackInfo<Value>& args) {
     Environment* env = Environment::GetCurrent(args.GetIsolate());
 
-    assert(args.Length() == 2 && "params(level, strategy)");
+    CHECK(args.Length() == 2 && "params(level, strategy)");
 
     ZCtx* ctx = Unwrap<ZCtx>(args.Holder());
 
@@ -488,7 +488,7 @@ class ZCtx : public AsyncWrap {
             ->AdjustAmountOfExternalAllocatedMemory(kInflateContextSize);
         break;
       default:
-        assert(0 && "wtf?");
+        CHECK(0 && "wtf?");
     }
 
     if (ctx->err_ != Z_OK) {
@@ -571,7 +571,7 @@ class ZCtx : public AsyncWrap {
   }
 
   void Unref() {
-    assert(refs_ > 0);
+    CHECK_GT(refs_, 0);
     if (--refs_ == 0) {
       MakeWeak<ZCtx>(this);
     }
diff --git a/src/pipe_wrap.cc b/src/pipe_wrap.cc
index 49d09f43fb..7bcc0fb155 100644
--- a/src/pipe_wrap.cc
+++ b/src/pipe_wrap.cc
@@ -61,11 +61,11 @@ uv_pipe_t* PipeWrap::UVHandle() {
 
 Local<Object> PipeWrap::Instantiate(Environment* env) {
   EscapableHandleScope handle_scope(env->isolate());
-  assert(!env->pipe_constructor_template().IsEmpty());
+  CHECK_EQ(false, env->pipe_constructor_template().IsEmpty());
   Local<Function> constructor = env->pipe_constructor_template()->GetFunction();
-  assert(!constructor.IsEmpty());
+  CHECK_EQ(false, constructor.IsEmpty());
   Local<Object> instance = constructor->NewInstance();
-  assert(!instance.IsEmpty());
+  CHECK_EQ(false, instance.IsEmpty());
   return handle_scope.Escape(instance);
 }
 
@@ -126,7 +126,7 @@ void PipeWrap::New(const FunctionCallbackInfo<Value>& args) {
   // This constructor should not be exposed to public javascript.
   // Therefore we assert that we are not trying to call this as a
   // normal function.
-  assert(args.IsConstructCall());
+  CHECK(args.IsConstructCall());
   Environment* env = Environment::GetCurrent(args.GetIsolate());
   new PipeWrap(env, args.This(), args[0]->IsTrue());
 }
@@ -138,7 +138,7 @@ PipeWrap::PipeWrap(Environment* env, Handle<Object> object, bool ipc)
                  reinterpret_cast<uv_stream_t*>(&handle_),
                  AsyncWrap::PROVIDER_PIPEWRAP) {
   int r = uv_pipe_init(env->event_loop(), &handle_, ipc);
-  assert(r == 0);  // How do we proxy this error up to javascript?
+  CHECK_EQ(r, 0);  // How do we proxy this error up to javascript?
                    // Suggestion: uv_pipe_init() returns void.
   UpdateWriteQueueSize();
 }
@@ -174,7 +174,7 @@ void PipeWrap::Listen(const FunctionCallbackInfo<Value>& args) {
 // TODO(bnoordhuis) maybe share with TCPWrap?
 void PipeWrap::OnConnection(uv_stream_t* handle, int status) {
   PipeWrap* pipe_wrap = static_cast<PipeWrap*>(handle->data);
-  assert(&pipe_wrap->handle_ == reinterpret_cast<uv_pipe_t*>(handle));
+  CHECK_EQ(&pipe_wrap->handle_, reinterpret_cast<uv_pipe_t*>(handle));
 
   Environment* env = pipe_wrap->env();
   HandleScope handle_scope(env->isolate());
@@ -182,7 +182,7 @@ void PipeWrap::OnConnection(uv_stream_t* handle, int status) {
 
   // We should not be getting this callback if someone as already called
   // uv_close() on the handle.
-  assert(pipe_wrap->persistent().IsEmpty() == false);
+  CHECK_EQ(pipe_wrap->persistent().IsEmpty(), false);
 
   Local<Value> argv[] = {
     Integer::New(env->isolate(), status),
@@ -212,15 +212,15 @@ void PipeWrap::OnConnection(uv_stream_t* handle, int status) {
 void PipeWrap::AfterConnect(uv_connect_t* req, int status) {
   ConnectWrap* req_wrap = static_cast<ConnectWrap*>(req->data);
   PipeWrap* wrap = static_cast<PipeWrap*>(req->handle->data);
-  assert(req_wrap->env() == wrap->env());
+  CHECK_EQ(req_wrap->env(), wrap->env());
   Environment* env = wrap->env();
 
   HandleScope handle_scope(env->isolate());
   Context::Scope context_scope(env->context());
 
   // The wrap and request objects should still be there.
-  assert(req_wrap->persistent().IsEmpty() == false);
-  assert(wrap->persistent().IsEmpty() == false);
+  CHECK_EQ(req_wrap->persistent().IsEmpty(), false);
+  CHECK_EQ(wrap->persistent().IsEmpty(), false);
 
   bool readable, writable;
 
@@ -265,8 +265,8 @@ void PipeWrap::Connect(const FunctionCallbackInfo<Value>& args) {
 
   PipeWrap* wrap = Unwrap<PipeWrap>(args.Holder());
 
-  assert(args[0]->IsObject());
-  assert(args[1]->IsString());
+  CHECK(args[0]->IsObject());
+  CHECK(args[1]->IsString());
 
   Local<Object> req_wrap_obj = args[0].As<Object>();
   node::Utf8Value name(args[1]);
diff --git a/src/process_wrap.cc b/src/process_wrap.cc
index 42afea0f20..47baf90994 100644
--- a/src/process_wrap.cc
+++ b/src/process_wrap.cc
@@ -73,7 +73,7 @@ class ProcessWrap : public HandleWrap {
     // This constructor should not be exposed to public javascript.
     // Therefore we assert that we are not trying to call this as a
     // normal function.
-    assert(args.IsConstructCall());
+    CHECK(args.IsConstructCall());
     Environment* env = Environment::GetCurrent(args.GetIsolate());
     new ProcessWrap(env, args.This());
   }
@@ -116,7 +116,7 @@ class ProcessWrap : public HandleWrap {
         Local<String> handle_key = env->handle_string();
         Local<Object> handle = stdio->Get(handle_key).As<Object>();
         uv_stream_t* stream = HandleToStream(env, handle);
-        assert(stream != NULL);
+        CHECK_NE(stream, NULL);
 
         options->stdio[i].flags = UV_INHERIT_STREAM;
         options->stdio[i].data.stream = stream;
@@ -231,7 +231,7 @@ class ProcessWrap : public HandleWrap {
     int err = uv_spawn(env->event_loop(), &wrap->process_, &options);
 
     if (err == 0) {
-      assert(wrap->process_.data == wrap);
+      CHECK_EQ(wrap->process_.data, wrap);
       wrap->object()->Set(env->pid_string(),
                           Integer::New(env->isolate(), wrap->process_.pid));
     }
@@ -262,8 +262,8 @@ class ProcessWrap : public HandleWrap {
                      int64_t exit_status,
                      int term_signal) {
     ProcessWrap* wrap = static_cast<ProcessWrap*>(handle->data);
-    assert(wrap != NULL);
-    assert(&wrap->process_ == handle);
+    CHECK_NE(wrap, NULL);
+    CHECK_EQ(&wrap->process_, handle);
 
     Environment* env = wrap->env();
     HandleScope handle_scope(env->isolate());
diff --git a/src/req_wrap.h b/src/req_wrap.h
index df4ed2ced1..ca8ff53195 100644
--- a/src/req_wrap.h
+++ b/src/req_wrap.h
@@ -48,8 +48,8 @@ class ReqWrap : public AsyncWrap {
   ~ReqWrap() {
     QUEUE_REMOVE(&req_wrap_queue_);
     // Assert that someone has called Dispatched()
-    assert(req_.data == this);
-    assert(!persistent().IsEmpty());
+    CHECK_EQ(req_.data, this);
+    CHECK_EQ(false, persistent().IsEmpty());
     persistent().Reset();
   }
 
diff --git a/src/signal_wrap.cc b/src/signal_wrap.cc
index 0c814358f3..e187f91c7b 100644
--- a/src/signal_wrap.cc
+++ b/src/signal_wrap.cc
@@ -67,7 +67,7 @@ class SignalWrap : public HandleWrap {
     // This constructor should not be exposed to public javascript.
     // Therefore we assert that we are not trying to call this as a
     // normal function.
-    assert(args.IsConstructCall());
+    CHECK(args.IsConstructCall());
     Environment* env = Environment::GetCurrent(args.GetIsolate());
     new SignalWrap(env, args.This());
   }
@@ -78,7 +78,7 @@ class SignalWrap : public HandleWrap {
                    reinterpret_cast<uv_handle_t*>(&handle_),
                    AsyncWrap::PROVIDER_SIGNALWRAP) {
     int r = uv_signal_init(env->event_loop(), &handle_);
-    assert(r == 0);
+    CHECK_EQ(r, 0);
   }
 
   ~SignalWrap() {
diff --git a/src/smalloc.cc b/src/smalloc.cc
index b1e9766430..9d84b9a15c 100644
--- a/src/smalloc.cc
+++ b/src/smalloc.cc
@@ -29,7 +29,6 @@
 #include "v8.h"
 
 #include <string.h>
-#include <assert.h>
 
 #define ALLOC_ID (0xA10C)
 
@@ -251,8 +250,8 @@ void SliceOnto(const FunctionCallbackInfo<Value>& args) {
   Local<Object> source = args[0].As<Object>();
   Local<Object> dest = args[1].As<Object>();
 
-  assert(source->HasIndexedPropertiesInExternalArrayData());
-  assert(!dest->HasIndexedPropertiesInExternalArrayData());
+  CHECK(source->HasIndexedPropertiesInExternalArrayData());
+  CHECK_EQ(false, dest->HasIndexedPropertiesInExternalArrayData());
 
   char* source_data = static_cast<char*>(
       source->GetIndexedPropertiesExternalArrayData());
@@ -261,20 +260,20 @@ void SliceOnto(const FunctionCallbackInfo<Value>& args) {
     source->GetIndexedPropertiesExternalArrayDataType();
   size_t source_size = ExternalArraySize(source_type);
 
-  assert(source_size != 0);
+  CHECK_NE(source_size, 0);
 
   size_t start = args[2]->Uint32Value();
   size_t end = args[3]->Uint32Value();
   size_t length = end - start;
 
   if (source_size > 1) {
-    assert(length * source_size >= length);
+    CHECK_GE(length * source_size, length);
     length *= source_size;
   }
 
-  assert(source_data != NULL || length == 0);
-  assert(end <= source_len);
-  assert(start <= end);
+  CHECK(source_data != NULL || length == 0);
+  CHECK_LE(end, source_len);
+  CHECK_LE(start, end);
 
   dest->SetIndexedPropertiesToExternalArrayData(source_data + start,
                                                 source_type,
@@ -303,7 +302,7 @@ void Alloc(const FunctionCallbackInfo<Value>& args) {
   } else {
     array_type = static_cast<ExternalArrayType>(args[2]->Uint32Value());
     size_t type_length = ExternalArraySize(array_type);
-    assert(type_length * length >= length);
+    CHECK_GE(type_length * length, length);
     length *= type_length;
   }
 
@@ -318,8 +317,8 @@ void Alloc(Environment* env,
            enum ExternalArrayType type) {
   size_t type_size = ExternalArraySize(type);
 
-  assert(length <= kMaxLength);
-  assert(type_size > 0);
+  CHECK_LE(length, kMaxLength);
+  CHECK_GT(type_size, 0);
 
   if (length == 0)
     return Alloc(env, obj, NULL, length, type);
@@ -339,7 +338,7 @@ void Alloc(Environment* env,
            char* data,
            size_t length,
            enum ExternalArrayType type) {
-  assert(!obj->HasIndexedPropertiesInExternalArrayData());
+  CHECK_EQ(false, obj->HasIndexedPropertiesInExternalArrayData());
   env->isolate()->AdjustAmountOfExternalAllocatedMemory(length);
   size_t size = length / ExternalArraySize(type);
   obj->SetIndexedPropertiesToExternalArrayData(data, type, size);
@@ -373,8 +372,8 @@ void AllocDispose(Environment* env, Handle<Object> obj) {
     obj->GetIndexedPropertiesExternalArrayDataType();
   size_t array_size = ExternalArraySize(array_type);
 
-  assert(array_size > 0);
-  assert(length * array_size >= length);
+  CHECK_GT(array_size, 0);
+  CHECK_GE(length * array_size, length);
 
   length *= array_size;
 
@@ -397,12 +396,12 @@ void Alloc(Environment* env,
            FreeCallback fn,
            void* hint,
            enum ExternalArrayType type) {
-  assert(length <= kMaxLength);
+  CHECK_LE(length, kMaxLength);
 
   size_t type_size = ExternalArraySize(type);
 
-  assert(type_size > 0);
-  assert(length * type_size >= length);
+  CHECK_GT(type_size, 0);
+  CHECK_GE(length * type_size, length);
 
   length *= type_size;
 
@@ -418,7 +417,7 @@ void Alloc(Environment* env,
            FreeCallback fn,
            void* hint,
            enum ExternalArrayType type) {
-  assert(!obj->HasIndexedPropertiesInExternalArrayData());
+  CHECK_EQ(false, obj->HasIndexedPropertiesInExternalArrayData());
   Isolate* isolate = env->isolate();
   HandleScope handle_scope(isolate);
   env->set_using_smalloc_alloc_cb(true);
diff --git a/src/spawn_sync.cc b/src/spawn_sync.cc
index 67ec98ba03..ea491be175 100644
--- a/src/spawn_sync.cc
+++ b/src/spawn_sync.cc
@@ -63,7 +63,7 @@ void SyncProcessOutputBuffer::OnAlloc(size_t suggested_size,
 
 void SyncProcessOutputBuffer::OnRead(const uv_buf_t* buf, size_t nread) {
   // If we hand out the same chunk twice, this should catch it.
-  assert(buf->base == data_ + used());
+  CHECK_EQ(buf->base, data_ + used());
   used_ += static_cast<unsigned int>(nread);
 }
 
@@ -111,12 +111,12 @@ SyncProcessStdioPipe::SyncProcessStdioPipe(SyncProcessRunner* process_handler,
       shutdown_req_(),
 
       lifecycle_(kUninitialized) {
-  assert(readable || writable);
+  CHECK(readable || writable);
 }
 
 
 SyncProcessStdioPipe::~SyncProcessStdioPipe() {
-  assert(lifecycle_ == kUninitialized || lifecycle_ == kClosed);
+  CHECK(lifecycle_ == kUninitialized || lifecycle_ == kClosed);
 
   SyncProcessOutputBuffer* buf;
   SyncProcessOutputBuffer* next;
@@ -129,7 +129,7 @@ SyncProcessStdioPipe::~SyncProcessStdioPipe() {
 
 
 int SyncProcessStdioPipe::Initialize(uv_loop_t* loop) {
-  assert(lifecycle_ == kUninitialized);
+  CHECK_EQ(lifecycle_, kUninitialized);
 
   int r = uv_pipe_init(loop, uv_pipe(), 0);
   if (r < 0)
@@ -143,7 +143,7 @@ int SyncProcessStdioPipe::Initialize(uv_loop_t* loop) {
 
 
 int SyncProcessStdioPipe::Start() {
-  assert(lifecycle_ == kInitialized);
+  CHECK_EQ(lifecycle_, kInitialized);
 
   // Set the busy flag already. If this function fails no recovery is
   // possible.
@@ -151,7 +151,7 @@ int SyncProcessStdioPipe::Start() {
 
   if (readable()) {
     if (input_buffer_.len > 0) {
-      assert(input_buffer_.base != NULL);
+      CHECK_NE(input_buffer_.base, NULL);
 
       int r = uv_write(&write_req_,
                        uv_stream(),
@@ -178,7 +178,7 @@ int SyncProcessStdioPipe::Start() {
 
 
 void SyncProcessStdioPipe::Close() {
-  assert(lifecycle_ == kInitialized || lifecycle_ == kStarted);
+  CHECK(lifecycle_ == kInitialized || lifecycle_ == kStarted);
 
   uv_close(uv_handle(), CloseCallback);
 
@@ -218,7 +218,7 @@ uv_stdio_flags SyncProcessStdioPipe::uv_flags() const {
 
 
 uv_pipe_t* SyncProcessStdioPipe::uv_pipe() const {
-  assert(lifecycle_ < kClosing);
+  CHECK_LT(lifecycle_, kClosing);
   return &uv_pipe_;
 }
 
@@ -309,7 +309,7 @@ void SyncProcessStdioPipe::OnClose() {
 
 
 void SyncProcessStdioPipe::SetError(int error) {
-  assert(error != 0);
+  CHECK_NE(error, 0);
   process_handler_->SetPipeError(error);
 }
 
@@ -406,7 +406,7 @@ SyncProcessRunner::SyncProcessRunner(Environment* env)
 
 
 SyncProcessRunner::~SyncProcessRunner() {
-  assert(lifecycle_ == kHandlesClosed);
+  CHECK_EQ(lifecycle_, kHandlesClosed);
 
   if (stdio_pipes_ != NULL) {
     for (size_t i = 0; i < stdio_count_; i++) {
@@ -432,7 +432,7 @@ Environment* SyncProcessRunner::env() const {
 Local<Object> SyncProcessRunner::Run(Local<Value> options) {
   EscapableHandleScope scope(env()->isolate());
 
-  assert(lifecycle_ == kUninitialized);
+  CHECK_EQ(lifecycle_, kUninitialized);
 
   TryInitializeAndRunLoop(options);
   CloseHandlesAndDeleteLoop();
@@ -448,7 +448,7 @@ void SyncProcessRunner::TryInitializeAndRunLoop(Local<Value> options) {
 
   // There is no recovery from failure inside TryInitializeAndRunLoop - the
   // only option we'd have is to close all handles and destroy the loop.
-  assert(lifecycle_ == kUninitialized);
+  CHECK_EQ(lifecycle_, kUninitialized);
   lifecycle_ = kInitialized;
 
   uv_loop_ = new uv_loop_t;
@@ -500,12 +500,12 @@ void SyncProcessRunner::TryInitializeAndRunLoop(Local<Value> options) {
     abort();
 
   // If we get here the process should have exited.
-  assert(exit_status_ >= 0);
+  CHECK_GE(exit_status_, 0);
 }
 
 
 void SyncProcessRunner::CloseHandlesAndDeleteLoop() {
-  assert(lifecycle_ < kHandlesClosed);
+  CHECK_LT(lifecycle_, kHandlesClosed);
 
   if (uv_loop_ != NULL) {
     CloseStdioPipes();
@@ -528,8 +528,8 @@ void SyncProcessRunner::CloseHandlesAndDeleteLoop() {
 
   } else {
     // If the loop doesn't exist, neither should any pipes or timers.
-    assert(!stdio_pipes_initialized_);
-    assert(!kill_timer_initialized_);
+    CHECK_EQ(false, stdio_pipes_initialized_);
+    CHECK_EQ(false, kill_timer_initialized_);
   }
 
   lifecycle_ = kHandlesClosed;
@@ -537,11 +537,11 @@ void SyncProcessRunner::CloseHandlesAndDeleteLoop() {
 
 
 void SyncProcessRunner::CloseStdioPipes() {
-  assert(lifecycle_ < kHandlesClosed);
+  CHECK_LT(lifecycle_, kHandlesClosed);
 
   if (stdio_pipes_initialized_) {
-    assert(stdio_pipes_ != NULL);
-    assert(uv_loop_ != NULL);
+    CHECK_NE(stdio_pipes_, NULL);
+    CHECK_NE(uv_loop_, NULL);
 
     for (uint32_t i = 0; i < stdio_count_; i++) {
       if (stdio_pipes_[i] != NULL)
@@ -554,11 +554,11 @@ void SyncProcessRunner::CloseStdioPipes() {
 
 
 void SyncProcessRunner::CloseKillTimer() {
-  assert(lifecycle_ < kHandlesClosed);
+  CHECK_LT(lifecycle_, kHandlesClosed);
 
   if (kill_timer_initialized_) {
-    assert(timeout_ > 0);
-    assert(uv_loop_ != NULL);
+    CHECK_GT(timeout_, 0);
+    CHECK_NE(uv_loop_, NULL);
 
     uv_handle_t* uv_timer_handle = reinterpret_cast<uv_handle_t*>(&uv_timer_);
     uv_ref(uv_timer_handle);
@@ -590,7 +590,7 @@ void SyncProcessRunner::Kill() {
       SetError(r);
 
       r = uv_process_kill(&uv_process_, SIGKILL);
-      assert(r >= 0 || r == UV_ESRCH);
+      CHECK(r >= 0 || r == UV_ESRCH);
     }
   }
 
@@ -683,8 +683,8 @@ Local<Object> SyncProcessRunner::BuildResultObject() {
 
 
 Local<Array> SyncProcessRunner::BuildOutputArray() {
-  assert(lifecycle_ >= kInitialized);
-  assert(stdio_pipes_ != NULL);
+  CHECK_GE(lifecycle_, kInitialized);
+  CHECK_NE(stdio_pipes_, NULL);
 
   EscapableHandleScope scope(env()->isolate());
   Local<Array> js_output = Array::New(env()->isolate(), stdio_count_);
@@ -868,15 +868,15 @@ int SyncProcessRunner::ParseStdioOption(int child_fd,
     return AddStdioInheritFD(child_fd, inherit_fd);
 
   } else {
-    assert(0 && "invalid child stdio type");
+    CHECK(0 && "invalid child stdio type");
     return UV_EINVAL;
   }
 }
 
 
 int SyncProcessRunner::AddStdioIgnore(uint32_t child_fd) {
-  assert(child_fd < stdio_count_);
-  assert(stdio_pipes_[child_fd] == NULL);
+  CHECK_LT(child_fd, stdio_count_);
+  CHECK_EQ(stdio_pipes_[child_fd], NULL);
 
   uv_stdio_containers_[child_fd].flags = UV_IGNORE;
 
@@ -888,8 +888,8 @@ int SyncProcessRunner::AddStdioPipe(uint32_t child_fd,
                                     bool readable,
                                     bool writable,
                                     uv_buf_t input_buffer) {
-  assert(child_fd < stdio_count_);
-  assert(stdio_pipes_[child_fd] == NULL);
+  CHECK_LT(child_fd, stdio_count_);
+  CHECK_EQ(stdio_pipes_[child_fd], NULL);
 
   SyncProcessStdioPipe* h = new SyncProcessStdioPipe(this,
                                                      readable,
@@ -912,8 +912,8 @@ int SyncProcessRunner::AddStdioPipe(uint32_t child_fd,
 
 
 int SyncProcessRunner::AddStdioInheritFD(uint32_t child_fd, int inherit_fd) {
-  assert(child_fd < stdio_count_);
-  assert(stdio_pipes_[child_fd] == NULL);
+  CHECK_LT(child_fd, stdio_count_);
+  CHECK_EQ(stdio_pipes_[child_fd], NULL);
 
   uv_stdio_containers_[child_fd].flags = UV_INHERIT_FD;
   uv_stdio_containers_[child_fd].data.fd = inherit_fd;
diff --git a/src/stream_wrap.cc b/src/stream_wrap.cc
index 3c7fb3388f..a274b0bca3 100644
--- a/src/stream_wrap.cc
+++ b/src/stream_wrap.cc
@@ -107,7 +107,7 @@ void StreamWrap::OnAlloc(uv_handle_t* handle,
                          size_t suggested_size,
                          uv_buf_t* buf) {
   StreamWrap* wrap = static_cast<StreamWrap*>(handle->data);
-  assert(wrap->stream() == reinterpret_cast<uv_stream_t*>(handle));
+  CHECK_EQ(wrap->stream(), reinterpret_cast<uv_stream_t*>(handle));
   wrap->callbacks()->DoAlloc(handle, suggested_size, buf);
 }
 
@@ -140,7 +140,7 @@ void StreamWrap::OnReadCommon(uv_stream_t* handle,
 
   // We should not be getting this callback if someone as already called
   // uv_close() on the handle.
-  assert(wrap->persistent().IsEmpty() == false);
+  CHECK_EQ(wrap->persistent().IsEmpty(), false);
 
   if (nread > 0) {
     if (wrap->is_tcp()) {
@@ -170,7 +170,7 @@ void StreamWrap::OnRead(uv_stream_t* handle,
 
 
 size_t StreamWrap::WriteBuffer(Handle<Value> val, uv_buf_t* buf) {
-  assert(Buffer::HasInstance(val));
+  CHECK(Buffer::HasInstance(val));
 
   // Simple non-writev case
   buf->base = Buffer::Data(val);
@@ -185,8 +185,8 @@ void StreamWrap::WriteBuffer(const FunctionCallbackInfo<Value>& args) {
 
   StreamWrap* wrap = Unwrap<StreamWrap>(args.Holder());
 
-  assert(args[0]->IsObject());
-  assert(Buffer::HasInstance(args[1]));
+  CHECK(args[0]->IsObject());
+  CHECK(Buffer::HasInstance(args[1]));
 
   Local<Object> req_wrap_obj = args[0].As<Object>();
   Local<Object> buf_obj = args[1].As<Object>();
@@ -206,7 +206,7 @@ void StreamWrap::WriteBuffer(const FunctionCallbackInfo<Value>& args) {
     goto done;
   if (count == 0)
     goto done;
-  assert(count == 1);
+  CHECK_EQ(count, 1);
 
   // Allocate, or write rest
   storage = new char[sizeof(WriteWrap)];
@@ -242,8 +242,8 @@ void StreamWrap::WriteStringImpl(const FunctionCallbackInfo<Value>& args) {
 
   StreamWrap* wrap = Unwrap<StreamWrap>(args.Holder());
 
-  assert(args[0]->IsObject());
-  assert(args[1]->IsString());
+  CHECK(args[0]->IsObject());
+  CHECK(args[1]->IsString());
 
   Local<Object> req_wrap_obj = args[0].As<Object>();
   Local<String> string = args[1].As<String>();
@@ -293,7 +293,7 @@ void StreamWrap::WriteStringImpl(const FunctionCallbackInfo<Value>& args) {
       goto done;
 
     // Partial write
-    assert(count == 1);
+    CHECK_EQ(count, 1);
   }
 
   storage = new char[sizeof(WriteWrap) + storage_size + 15];
@@ -315,7 +315,7 @@ void StreamWrap::WriteStringImpl(const FunctionCallbackInfo<Value>& args) {
                                    encoding);
   }
 
-  assert(data_size <= storage_size);
+  CHECK_LE(data_size, storage_size);
 
   buf = uv_buf_init(data, data_size);
 
@@ -334,7 +334,7 @@ void StreamWrap::WriteStringImpl(const FunctionCallbackInfo<Value>& args) {
       send_handle = wrap->GetHandle();
       // Reference StreamWrap instance to prevent it from being garbage
       // collected before `AfterWrite` is called.
-      assert(!req_wrap->persistent().IsEmpty());
+      CHECK_EQ(false, req_wrap->persistent().IsEmpty());
       req_wrap->object()->Set(env->handle_string(), send_handle_obj);
     }
 
@@ -369,8 +369,8 @@ void StreamWrap::Writev(const FunctionCallbackInfo<Value>& args) {
 
   StreamWrap* wrap = Unwrap<StreamWrap>(args.Holder());
 
-  assert(args[0]->IsObject());
-  assert(args[1]->IsArray());
+  CHECK(args[0]->IsObject());
+  CHECK(args[1]->IsArray());
 
   Local<Object> req_wrap_obj = args[0].As<Object>();
   Local<Array> chunks = args[1].As<Array>();
@@ -429,7 +429,7 @@ void StreamWrap::Writev(const FunctionCallbackInfo<Value>& args) {
 
     // Write string
     offset = ROUND_UP(offset, 16);
-    assert(offset < storage_size);
+    CHECK_LT(offset, storage_size);
     char* str_storage = storage + offset;
     size_t str_size = storage_size - offset;
 
@@ -494,7 +494,7 @@ void StreamWrap::WriteBinaryString(const FunctionCallbackInfo<Value>& args) {
 
 void StreamWrap::SetBlocking(const FunctionCallbackInfo<Value>& args) {
   StreamWrap* wrap = Unwrap<StreamWrap>(args.Holder());
-  assert(args.Length() > 0);
+  CHECK_GT(args.Length(), 0);
   int err = uv_stream_set_blocking(wrap->stream(), args[0]->IsTrue());
   args.GetReturnValue().Set(err);
 }
@@ -508,8 +508,8 @@ void StreamWrap::AfterWrite(uv_write_t* req, int status) {
   Context::Scope context_scope(env->context());
 
   // The wrap and request objects should still be there.
-  assert(req_wrap->persistent().IsEmpty() == false);
-  assert(wrap->persistent().IsEmpty() == false);
+  CHECK_EQ(req_wrap->persistent().IsEmpty(), false);
+  CHECK_EQ(wrap->persistent().IsEmpty(), false);
 
   // Unref handle property
   Local<Object> req_wrap_obj = req_wrap->object();
@@ -539,7 +539,7 @@ void StreamWrap::Shutdown(const FunctionCallbackInfo<Value>& args) {
 
   StreamWrap* wrap = Unwrap<StreamWrap>(args.Holder());
 
-  assert(args[0]->IsObject());
+  CHECK(args[0]->IsObject());
   Local<Object> req_wrap_obj = args[0].As<Object>();
 
   ShutdownWrap* req_wrap = new ShutdownWrap(env,
@@ -559,8 +559,8 @@ void StreamWrap::AfterShutdown(uv_shutdown_t* req, int status) {
   Environment* env = wrap->env();
 
   // The wrap and request objects should still be there.
-  assert(req_wrap->persistent().IsEmpty() == false);
-  assert(wrap->persistent().IsEmpty() == false);
+  CHECK_EQ(req_wrap->persistent().IsEmpty(), false);
+  CHECK_EQ(wrap->persistent().IsEmpty(), false);
 
   HandleScope handle_scope(env->isolate());
   Context::Scope context_scope(env->context());
@@ -699,7 +699,7 @@ void StreamWrapCallbacks::DoRead(uv_stream_t* handle,
   }
 
   char* base = static_cast<char*>(realloc(buf->base, nread));
-  assert(static_cast<size_t>(nread) <= buf->len);
+  CHECK_LE(static_cast<size_t>(nread), buf->len);
   argv[1] = Buffer::Use(env, base, nread);
 
   Local<Object> pending_obj;
@@ -710,7 +710,7 @@ void StreamWrapCallbacks::DoRead(uv_stream_t* handle,
   } else if (pending == UV_UDP) {
     pending_obj = AcceptHandle<UDPWrap, uv_udp_t>(env, handle);
   } else {
-    assert(pending == UV_UNKNOWN_HANDLE);
+    CHECK_EQ(pending, UV_UNKNOWN_HANDLE);
   }
 
   if (!pending_obj.IsEmpty()) {
diff --git a/src/stream_wrap.h b/src/stream_wrap.h
index 34e2799357..adf457e2a1 100644
--- a/src/stream_wrap.h
+++ b/src/stream_wrap.h
@@ -48,7 +48,7 @@ class WriteWrap: public ReqWrap<uv_write_t> {
 
   // This is just to keep the compiler happy. It should never be called, since
   // we don't use exceptions in node.
-  void operator delete(void* ptr, char* storage) { assert(0); }
+  void operator delete(void* ptr, char* storage) { UNREACHABLE(); }
 
   inline StreamWrap* wrap() const {
     return wrap_;
@@ -57,8 +57,8 @@ class WriteWrap: public ReqWrap<uv_write_t> {
  private:
   // People should not be using the non-placement new and delete operator on a
   // WriteWrap. Ensure this never happens.
-  void* operator new(size_t size) { assert(0); }
-  void operator delete(void* ptr) { assert(0); }
+  void* operator new(size_t size) { UNREACHABLE(); }
+  void operator delete(void* ptr) { UNREACHABLE(); }
 
   StreamWrap* const wrap_;
 };
diff --git a/src/string_bytes.cc b/src/string_bytes.cc
index 38a082fa2b..399854acb7 100644
--- a/src/string_bytes.cc
+++ b/src/string_bytes.cc
@@ -25,7 +25,6 @@
 #include "node_buffer.h"
 #include "v8.h"
 
-#include <assert.h>
 #include <limits.h>
 #include <string.h>  // memcpy
 
@@ -378,7 +377,7 @@ size_t StringBytes::Write(Isolate* isolate,
       break;
 
     default:
-      assert(0 && "unknown encoding");
+      CHECK(0 && "unknown encoding");
       break;
   }
 
@@ -435,12 +434,12 @@ size_t StringBytes::StorageSize(Isolate* isolate,
       break;
 
     case HEX:
-      assert(str->Length() % 2 == 0 && "invalid hex string length");
+      CHECK(str->Length() % 2 == 0 && "invalid hex string length");
       data_size = str->Length() / 2;
       break;
 
     default:
-      assert(0 && "unknown encoding");
+      CHECK(0 && "unknown encoding");
       break;
   }
 
@@ -490,7 +489,7 @@ size_t StringBytes::Size(Isolate* isolate,
       break;
 
     default:
-      assert(0 && "unknown encoding");
+      CHECK(0 && "unknown encoding");
       break;
   }
 
@@ -610,8 +609,8 @@ static size_t base64_encode(const char* src,
                             char* dst,
                             size_t dlen) {
   // We know how much we'll write, just make sure that there's space.
-  assert(dlen >= base64_encoded_size(slen) &&
-      "not enough space provided for base64 encode");
+  CHECK(dlen >= base64_encoded_size(slen) &&
+        "not enough space provided for base64 encode");
 
   dlen = base64_encoded_size(slen);
 
@@ -671,7 +670,7 @@ static size_t base64_encode(const char* src,
 
 static size_t hex_encode(const char* src, size_t slen, char* dst, size_t dlen) {
   // We know how much we'll write, just make sure that there's space.
-  assert(dlen >= slen * 2 &&
+  CHECK(dlen >= slen * 2 &&
       "not enough space provided for hex encode");
 
   dlen = slen * 2;
@@ -693,7 +692,7 @@ Local<Value> StringBytes::Encode(Isolate* isolate,
                                  enum encoding encoding) {
   EscapableHandleScope scope(isolate);
 
-  assert(buflen <= Buffer::kMaxLength);
+  CHECK_LE(buflen, Buffer::kMaxLength);
   if (!buflen && encoding != BUFFER)
     return scope.Escape(String::Empty(isolate));
 
@@ -739,7 +738,7 @@ Local<Value> StringBytes::Encode(Isolate* isolate,
       char* dst = new char[dlen];
 
       size_t written = base64_encode(buf, buflen, dst, dlen);
-      assert(written == dlen);
+      CHECK_EQ(written, dlen);
 
       if (dlen < EXTERN_APEX) {
         val = OneByteString(isolate, dst, dlen);
@@ -780,7 +779,7 @@ Local<Value> StringBytes::Encode(Isolate* isolate,
       size_t dlen = buflen * 2;
       char* dst = new char[dlen];
       size_t written = hex_encode(buf, buflen, dst, dlen);
-      assert(written == dlen);
+      CHECK_EQ(written, dlen);
 
       if (dlen < EXTERN_APEX) {
         val = OneByteString(isolate, dst, dlen);
@@ -792,7 +791,7 @@ Local<Value> StringBytes::Encode(Isolate* isolate,
     }
 
     default:
-      assert(0 && "unknown encoding");
+      CHECK(0 && "unknown encoding");
       break;
   }
 
diff --git a/src/tcp_wrap.cc b/src/tcp_wrap.cc
index 0bd3cdb9c2..128303cb39 100644
--- a/src/tcp_wrap.cc
+++ b/src/tcp_wrap.cc
@@ -57,11 +57,11 @@ typedef class ReqWrap<uv_connect_t> ConnectWrap;
 
 Local<Object> TCPWrap::Instantiate(Environment* env) {
   EscapableHandleScope handle_scope(env->isolate());
-  assert(env->tcp_constructor_template().IsEmpty() == false);
+  CHECK_EQ(env->tcp_constructor_template().IsEmpty(), false);
   Local<Function> constructor = env->tcp_constructor_template()->GetFunction();
-  assert(constructor.IsEmpty() == false);
+  CHECK_EQ(constructor.IsEmpty(), false);
   Local<Object> instance = constructor->NewInstance();
-  assert(instance.IsEmpty() == false);
+  CHECK_EQ(instance.IsEmpty(), false);
   return handle_scope.Escape(instance);
 }
 
@@ -147,10 +147,10 @@ void TCPWrap::New(const FunctionCallbackInfo<Value>& args) {
   // This constructor should not be exposed to public javascript.
   // Therefore we assert that we are not trying to call this as a
   // normal function.
-  assert(args.IsConstructCall());
+  CHECK(args.IsConstructCall());
   Environment* env = Environment::GetCurrent(args.GetIsolate());
   TCPWrap* wrap = new TCPWrap(env, args.This());
-  assert(wrap);
+  CHECK(wrap);
 }
 
 
@@ -160,14 +160,14 @@ TCPWrap::TCPWrap(Environment* env, Handle<Object> object)
                  reinterpret_cast<uv_stream_t*>(&handle_),
                  AsyncWrap::PROVIDER_TCPWRAP) {
   int r = uv_tcp_init(env->event_loop(), &handle_);
-  assert(r == 0);  // How do we proxy this error up to javascript?
+  CHECK_EQ(r, 0);  // How do we proxy this error up to javascript?
                    // Suggestion: uv_tcp_init() returns void.
   UpdateWriteQueueSize();
 }
 
 
 TCPWrap::~TCPWrap() {
-  assert(persistent().IsEmpty());
+  CHECK(persistent().IsEmpty());
 }
 
 
@@ -177,7 +177,7 @@ void TCPWrap::GetSockName(const FunctionCallbackInfo<Value>& args) {
 
   TCPWrap* wrap = Unwrap<TCPWrap>(args.Holder());
 
-  assert(args[0]->IsObject());
+  CHECK(args[0]->IsObject());
   Local<Object> out = args[0].As<Object>();
 
   int addrlen = sizeof(address);
@@ -199,7 +199,7 @@ void TCPWrap::GetPeerName(const FunctionCallbackInfo<Value>& args) {
 
   TCPWrap* wrap = Unwrap<TCPWrap>(args.Holder());
 
-  assert(args[0]->IsObject());
+  CHECK(args[0]->IsObject());
   Local<Object> out = args[0].As<Object>();
 
   int addrlen = sizeof(address);
@@ -291,7 +291,7 @@ void TCPWrap::Listen(const FunctionCallbackInfo<Value>& args) {
 
 void TCPWrap::OnConnection(uv_stream_t* handle, int status) {
   TCPWrap* tcp_wrap = static_cast<TCPWrap*>(handle->data);
-  assert(&tcp_wrap->handle_ == reinterpret_cast<uv_tcp_t*>(handle));
+  CHECK_EQ(&tcp_wrap->handle_, reinterpret_cast<uv_tcp_t*>(handle));
   Environment* env = tcp_wrap->env();
 
   HandleScope handle_scope(env->isolate());
@@ -299,7 +299,7 @@ void TCPWrap::OnConnection(uv_stream_t* handle, int status) {
 
   // We should not be getting this callback if someone as already called
   // uv_close() on the handle.
-  assert(tcp_wrap->persistent().IsEmpty() == false);
+  CHECK_EQ(tcp_wrap->persistent().IsEmpty(), false);
 
   Local<Value> argv[2] = {
     Integer::New(env->isolate(), status),
@@ -327,15 +327,15 @@ void TCPWrap::OnConnection(uv_stream_t* handle, int status) {
 void TCPWrap::AfterConnect(uv_connect_t* req, int status) {
   ConnectWrap* req_wrap = static_cast<ConnectWrap*>(req->data);
   TCPWrap* wrap = static_cast<TCPWrap*>(req->handle->data);
-  assert(req_wrap->env() == wrap->env());
+  CHECK_EQ(req_wrap->env(), wrap->env());
   Environment* env = wrap->env();
 
   HandleScope handle_scope(env->isolate());
   Context::Scope context_scope(env->context());
 
   // The wrap and request objects should still be there.
-  assert(req_wrap->persistent().IsEmpty() == false);
-  assert(wrap->persistent().IsEmpty() == false);
+  CHECK_EQ(req_wrap->persistent().IsEmpty(), false);
+  CHECK_EQ(wrap->persistent().IsEmpty(), false);
 
   Local<Object> req_wrap_obj = req_wrap->object();
   Local<Value> argv[5] = {
@@ -357,9 +357,9 @@ void TCPWrap::Connect(const FunctionCallbackInfo<Value>& args) {
 
   TCPWrap* wrap = Unwrap<TCPWrap>(args.Holder());
 
-  assert(args[0]->IsObject());
-  assert(args[1]->IsString());
-  assert(args[2]->Uint32Value());
+  CHECK(args[0]->IsObject());
+  CHECK(args[1]->IsString());
+  CHECK(args[2]->Uint32Value());
 
   Local<Object> req_wrap_obj = args[0].As<Object>();
   node::Utf8Value ip_address(args[1]);
@@ -390,9 +390,9 @@ void TCPWrap::Connect6(const FunctionCallbackInfo<Value>& args) {
 
   TCPWrap* wrap = Unwrap<TCPWrap>(args.Holder());
 
-  assert(args[0]->IsObject());
-  assert(args[1]->IsString());
-  assert(args[2]->Uint32Value());
+  CHECK(args[0]->IsObject());
+  CHECK(args[1]->IsString());
+  CHECK(args[2]->Uint32Value());
 
   Local<Object> req_wrap_obj = args[0].As<Object>();
   node::Utf8Value ip_address(args[1]);
diff --git a/src/timer_wrap.cc b/src/timer_wrap.cc
index 63058b1f0a..f9a2db39fe 100644
--- a/src/timer_wrap.cc
+++ b/src/timer_wrap.cc
@@ -78,7 +78,7 @@ class TimerWrap : public HandleWrap {
     // This constructor should not be exposed to public javascript.
     // Therefore we assert that we are not trying to call this as a
     // normal function.
-    assert(args.IsConstructCall());
+    CHECK(args.IsConstructCall());
     Environment* env = Environment::GetCurrent(args.GetIsolate());
     new TimerWrap(env, args.This());
   }
@@ -89,7 +89,7 @@ class TimerWrap : public HandleWrap {
                    reinterpret_cast<uv_handle_t*>(&handle_),
                    AsyncWrap::PROVIDER_TIMERWRAP) {
     int r = uv_timer_init(env->event_loop(), &handle_);
-    assert(r == 0);
+    CHECK_EQ(r, 0);
   }
 
   ~TimerWrap() {
diff --git a/src/tls_wrap.cc b/src/tls_wrap.cc
index 9006fcf8bd..d3ad8a5042 100644
--- a/src/tls_wrap.cc
+++ b/src/tls_wrap.cc
@@ -272,7 +272,7 @@ void TLSCallbacks::Start(const FunctionCallbackInfo<Value>& args) {
   wrap->started_ = true;
 
   // Send ClientHello handshake
-  assert(wrap->is_client());
+  CHECK(wrap->is_client());
   wrap->ClearOut();
   wrap->EncOut();
 }
@@ -336,7 +336,7 @@ void TLSCallbacks::EncOut() {
   size_t size[ARRAY_SIZE(data)];
   size_t count = ARRAY_SIZE(data);
   write_size_ = NodeBIO::FromBIO(enc_out_)->PeekMultiple(data, size, &count);
-  assert(write_size_ != 0 && count != 0);
+  CHECK(write_size_ != 0 && count != 0);
 
   write_req_.data = this;
   uv_buf_t buf[ARRAY_SIZE(data)];
@@ -387,7 +387,7 @@ int TLSCallbacks::PrintErrorsCb(const char* str, size_t len, void* arg) {
 
   memcpy(error_buf_, str, avail);
   error_off_ += avail;
-  assert(error_off_ < sizeof(error_buf_));
+  CHECK_LT(error_off_, sizeof(error_buf_));
 
   // Zero-terminate
   error_buf_[error_off_] = '\0';
@@ -418,7 +418,7 @@ Local<Value> TLSCallbacks::GetSSLError(int status, int* err, const char** msg) {
       break;
     default:
       {
-        assert(*err == SSL_ERROR_SSL || *err == SSL_ERROR_SYSCALL);
+        CHECK(*err == SSL_ERROR_SSL || *err == SSL_ERROR_SYSCALL);
 
         const char* buf = PrintErrors();
 
@@ -427,7 +427,7 @@ Local<Value> TLSCallbacks::GetSSLError(int status, int* err, const char** msg) {
         Local<Value> exception = Exception::Error(message);
 
         if (msg != NULL) {
-          assert(*msg == NULL);
+          CHECK_EQ(*msg, NULL);
           *msg = buf;
         }
 
@@ -450,7 +450,7 @@ void TLSCallbacks::ClearOut() {
   HandleScope handle_scope(env()->isolate());
   Context::Scope context_scope(env()->context());
 
-  assert(ssl_ != NULL);
+  CHECK_NE(ssl_, NULL);
 
   char out[kClearOutChunkSize];
   int read;
@@ -502,7 +502,7 @@ bool TLSCallbacks::ClearIn() {
     size_t avail = 0;
     char* data = clear_in_->Peek(&avail);
     written = SSL_write(ssl_, data, avail);
-    assert(written == -1 || written == static_cast<int>(avail));
+    CHECK(written == -1 || written == static_cast<int>(avail));
     if (written == -1)
       break;
     clear_in_->Read(NULL, avail);
@@ -510,7 +510,7 @@ bool TLSCallbacks::ClearIn() {
 
   // All written
   if (clear_in_->Length() == 0) {
-    assert(written >= 0);
+    CHECK_GE(written, 0);
     return true;
   }
 
@@ -549,7 +549,7 @@ int TLSCallbacks::DoWrite(WriteWrap* w,
                           size_t count,
                           uv_stream_t* send_handle,
                           uv_write_cb cb) {
-  assert(send_handle == NULL);
+  CHECK_EQ(send_handle, NULL);
 
   bool empty = true;
 
@@ -589,7 +589,7 @@ int TLSCallbacks::DoWrite(WriteWrap* w,
   int written = 0;
   for (i = 0; i < count; i++) {
     written = SSL_write(ssl_, bufs[i].base, bufs[i].len);
-    assert(written == -1 || written == static_cast<int>(bufs[i].len));
+    CHECK(written == -1 || written == static_cast<int>(bufs[i].len));
     if (written == -1)
       break;
   }
@@ -651,7 +651,7 @@ void TLSCallbacks::DoRead(uv_stream_t* handle,
   }
 
   // Only client connections can receive data
-  assert(ssl_ != NULL);
+  CHECK_NE(ssl_, NULL);
 
   // Commit read data
   NodeBIO* enc_in = NodeBIO::FromBIO(enc_in_);
@@ -661,7 +661,7 @@ void TLSCallbacks::DoRead(uv_stream_t* handle,
   if (!hello_parser_.IsEnded()) {
     size_t avail = 0;
     uint8_t* data = reinterpret_cast<uint8_t*>(enc_in->Peek(&avail));
-    assert(avail == 0 || data != NULL);
+    CHECK(avail == 0 || data != NULL);
     return hello_parser_.Parse(data, avail);
   }
 
diff --git a/src/tty_wrap.cc b/src/tty_wrap.cc
index ec4ad82a72..bd9368d3ac 100644
--- a/src/tty_wrap.cc
+++ b/src/tty_wrap.cc
@@ -100,7 +100,7 @@ uv_tty_t* TTYWrap::UVHandle() {
 void TTYWrap::GuessHandleType(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
   int fd = args[0]->Int32Value();
-  assert(fd >= 0);
+  CHECK_GE(fd, 0);
 
   uv_handle_type t = uv_guess_handle(fd);
   const char* type = NULL;
@@ -122,7 +122,7 @@ void TTYWrap::GuessHandleType(const FunctionCallbackInfo<Value>& args) {
 
 void TTYWrap::IsTTY(const FunctionCallbackInfo<Value>& args) {
   int fd = args[0]->Int32Value();
-  assert(fd >= 0);
+  CHECK_GE(fd, 0);
   bool rc = uv_guess_handle(fd) == UV_TTY;
   args.GetReturnValue().Set(rc);
 }
@@ -132,7 +132,7 @@ void TTYWrap::GetWindowSize(const FunctionCallbackInfo<Value>& args) {
   Environment* env = Environment::GetCurrent(args.GetIsolate());
 
   TTYWrap* wrap = Unwrap<TTYWrap>(args.Holder());
-  assert(args[0]->IsArray());
+  CHECK(args[0]->IsArray());
 
   int width, height;
   int err = uv_tty_get_winsize(&wrap->handle_, &width, &height);
@@ -160,10 +160,10 @@ void TTYWrap::New(const FunctionCallbackInfo<Value>& args) {
   // This constructor should not be exposed to public javascript.
   // Therefore we assert that we are not trying to call this as a
   // normal function.
-  assert(args.IsConstructCall());
+  CHECK(args.IsConstructCall());
 
   int fd = args[0]->Int32Value();
-  assert(fd >= 0);
+  CHECK_GE(fd, 0);
 
   TTYWrap* wrap = new TTYWrap(env, args.This(), fd, args[1]->IsTrue());
   wrap->UpdateWriteQueueSize();
diff --git a/src/udp_wrap.cc b/src/udp_wrap.cc
index 1873b2ac18..5e2e7e2af1 100644
--- a/src/udp_wrap.cc
+++ b/src/udp_wrap.cc
@@ -78,7 +78,7 @@ UDPWrap::UDPWrap(Environment* env, Handle<Object> object)
                  reinterpret_cast<uv_handle_t*>(&handle_),
                  AsyncWrap::PROVIDER_UDPWRAP) {
   int r = uv_udp_init(env->event_loop(), &handle_);
-  assert(r == 0);  // can't fail anyway
+  CHECK_EQ(r, 0);  // can't fail anyway
 }
 
 
@@ -128,7 +128,7 @@ void UDPWrap::Initialize(Handle<Object> target,
 
 
 void UDPWrap::New(const FunctionCallbackInfo<Value>& args) {
-  assert(args.IsConstructCall());
+  CHECK(args.IsConstructCall());
   Environment* env = Environment::GetCurrent(args.GetIsolate());
   new UDPWrap(env, args.This());
 }
@@ -149,7 +149,7 @@ void UDPWrap::DoBind(const FunctionCallbackInfo<Value>& args, int family) {
   UDPWrap* wrap = Unwrap<UDPWrap>(args.Holder());
 
   // bind(ip, port, flags)
-  assert(args.Length() == 3);
+  CHECK_EQ(args.Length(), 3);
 
   node::Utf8Value address(args[0]);
   const int port = args[1]->Uint32Value();
@@ -165,7 +165,7 @@ void UDPWrap::DoBind(const FunctionCallbackInfo<Value>& args, int family) {
     err = uv_ip6_addr(*address, port, reinterpret_cast<sockaddr_in6*>(&addr));
     break;
   default:
-    assert(0 && "unexpected address family");
+    CHECK(0 && "unexpected address family");
     abort();
   }
 
@@ -192,7 +192,7 @@ void UDPWrap::Bind6(const FunctionCallbackInfo<Value>& args) {
 #define X(name, fn)                                                           \
   void UDPWrap::name(const FunctionCallbackInfo<Value>& args) {               \
     UDPWrap* wrap = Unwrap<UDPWrap>(args.Holder());                           \
-    assert(args.Length() == 1);                                               \
+    CHECK_EQ(args.Length(), 1);                                               \
     int flag = args[0]->Int32Value();                                         \
     int err = fn(&wrap->handle_, flag);                                       \
     args.GetReturnValue().Set(err);                                           \
@@ -210,7 +210,7 @@ void UDPWrap::SetMembership(const FunctionCallbackInfo<Value>& args,
                             uv_membership membership) {
   UDPWrap* wrap = Unwrap<UDPWrap>(args.Holder());
 
-  assert(args.Length() == 2);
+  CHECK_EQ(args.Length(), 2);
 
   node::Utf8Value address(args[0]);
   node::Utf8Value iface(args[1]);
@@ -244,13 +244,13 @@ void UDPWrap::DoSend(const FunctionCallbackInfo<Value>& args, int family) {
   UDPWrap* wrap = Unwrap<UDPWrap>(args.Holder());
 
   // send(req, buffer, offset, length, port, address)
-  assert(args[0]->IsObject());
-  assert(Buffer::HasInstance(args[1]));
-  assert(args[2]->IsUint32());
-  assert(args[3]->IsUint32());
-  assert(args[4]->IsUint32());
-  assert(args[5]->IsString());
-  assert(args[6]->IsBoolean());
+  CHECK(args[0]->IsObject());
+  CHECK(Buffer::HasInstance(args[1]));
+  CHECK(args[2]->IsUint32());
+  CHECK(args[3]->IsUint32());
+  CHECK(args[4]->IsUint32());
+  CHECK(args[5]->IsString());
+  CHECK(args[6]->IsBoolean());
 
   Local<Object> req_wrap_obj = args[0].As<Object>();
   Local<Object> buffer_obj = args[1].As<Object>();
@@ -260,7 +260,7 @@ void UDPWrap::DoSend(const FunctionCallbackInfo<Value>& args, int family) {
   node::Utf8Value address(args[5]);
   const bool have_callback = args[6]->IsTrue();
 
-  assert(length <= Buffer::Length(buffer_obj) - offset);
+  CHECK_LE(length, Buffer::Length(buffer_obj) - offset);
 
   SendWrap* req_wrap = new SendWrap(env, req_wrap_obj, have_callback);
 
@@ -277,7 +277,7 @@ void UDPWrap::DoSend(const FunctionCallbackInfo<Value>& args, int family) {
     err = uv_ip6_addr(*address, port, reinterpret_cast<sockaddr_in6*>(&addr));
     break;
   default:
-    assert(0 && "unexpected address family");
+    CHECK(0 && "unexpected address family");
     abort();
   }
 
@@ -331,7 +331,7 @@ void UDPWrap::GetSockName(const FunctionCallbackInfo<Value>& args) {
   struct sockaddr_storage address;
   UDPWrap* wrap = Unwrap<UDPWrap>(args.Holder());
 
-  assert(args[0]->IsObject());
+  CHECK(args[0]->IsObject());
   Local<Object> obj = args[0].As<Object>();
 
   int addrlen = sizeof(address);
@@ -416,7 +416,7 @@ void UDPWrap::OnRecv(uv_udp_t* handle,
 
 Local<Object> UDPWrap::Instantiate(Environment* env) {
   // If this assert fires then Initialize hasn't been called yet.
-  assert(env->udp_constructor_function().IsEmpty() == false);
+  CHECK_EQ(env->udp_constructor_function().IsEmpty(), false);
   return env->udp_constructor_function()->NewInstance();
 }
 
diff --git a/src/util-inl.h b/src/util-inl.h
index 045a27796d..6035cadc09 100644
--- a/src/util-inl.h
+++ b/src/util-inl.h
@@ -24,8 +24,6 @@
 
 #include "util.h"
 
-#include <assert.h>
-
 namespace node {
 
 template <typename Inner, typename Outer>
@@ -102,8 +100,8 @@ inline v8::Local<v8::String> OneByteString(v8::Isolate* isolate,
 
 template <typename TypeName>
 void Wrap(v8::Local<v8::Object> object, TypeName* pointer) {
-  assert(!object.IsEmpty());
-  assert(object->InternalFieldCount() > 0);
+  CHECK_EQ(false, object.IsEmpty());
+  CHECK_GT(object->InternalFieldCount(), 0);
   object->SetAlignedPointerInInternalField(0, pointer);
 }
 
@@ -113,8 +111,8 @@ void ClearWrap(v8::Local<v8::Object> object) {
 
 template <typename TypeName>
 TypeName* Unwrap(v8::Local<v8::Object> object) {
-  assert(!object.IsEmpty());
-  assert(object->InternalFieldCount() > 0);
+  CHECK_EQ(false, object.IsEmpty());
+  CHECK_GT(object->InternalFieldCount(), 0);
   void* pointer = object->GetAlignedPointerFromInternalField(0);
   return static_cast<TypeName*>(pointer);
 }