Looking for something? Use OneSearch!

PHP File Manager + Terminal

Server: www.bmcc.cuny.edu
Software: Apache/2.4.62 (Debian)

Current directory: //agents /nodejs /etw /etw_19/src

Editing: /agents/nodejs/etw/etw_19/src/main.cc

#include "typescript_etw.h"

/*
 * To keep size & dependencies down, this build has some "interesting" configuration.
 *  - This builds with the /NODEFAULTLIB option (i.e. CRT is unavailable) to exclude all the default library dependencies
 *  - Which means needing to define DllMain to do the work of the CRT version and enter it directly (/ENTRY:DllMain)
 *  - This means basics such as new & delete, or std::string & std::vector need to be implemented if needed
 *  - Also, don't allocate over a page (4kb) of locals in a function, else you'll get an unresolved external symbol for _chkstk
 *    - See https://stackoverflow.com/questions/7420927/unresolved-symbols-when-linking-without-c-runtime-with-vs2010
 *  - This also requires knowing how some of the funky ETW and Node.js macros work to avoid potentical issues:
 *    - See details on NAPI_MODULE below. This is mimiced in the process attach event in DllMain to initialize
 *    - ETW initialization (TRACELOGGING_DEFINE_PROVIDER) _appears_ to be a constant expression, (so hopefully does require CRT initialization)
 *  - Exceptions and runtime type information are also disabled for simplicity and size.
 *
 * Result: A skeleton native module compiled is around 15kb, instead of around 100kb when statically linking in the CRT.
 */

namespace typescript_etw {

// TODO: Is this safe if initialized multiple times in a process? May need to ensure InitEtw is only called once.
	// See https://nodejs.org/dist/latest-v10.x/docs/api/addons.html#addons_context_aware_addons
	napi_value Init(napi_env env, napi_value exports) {
		InitEtw();

auto register_fn = [&](const char *name, napi_callback cb) {
			napi_value fn;
			napi_status status;
			status = pnapi_create_function(env, name, 0, cb, nullptr, &fn);
			if (status == napi_ok) {
				status = pnapi_set_named_property(env, exports, name, fn);
			}
			return status == napi_ok;
		};

// Short-circuiting evaluation for any failures
		// Note: napi_add_env_cleanup_hook requires Node.js 10.2 or later. See https://nodejs.org/dist/latest-v10.x/docs/api/n-api.html#n_api_napi_add_env_cleanup_hook
		// Commented out cleanup hook for now, as VS Code uses an Electron which uses Node 8.9.3 (files at https://nodejs.org/dist/v8.9.3/)
		bool success = /* pnapi_add_env_cleanup_hook(env, CleanupEtw, nullptr) == napi_ok && */
			register_fn("logEvent", LogEvent) &&
			register_fn("logErrEvent", LogErrEvent) &&
			register_fn("logInfoEvent", LogInfoEvent);

if (!success) return nullptr; // TODO: Set exception? Just fails silently for now (but would likely crash if called).

return exports;
	}

// NAPI_MODULE(NODE_GYP_MODULE_NAME, Init)

// Do the work the macro would if we were using the C-runtime library to initialize (avoiding about 75KB of binary)
	extern "C" {
		static napi_module _module;

bool WINAPI DllMain(
			_In_ HINSTANCE hinstDLL,
			_In_ DWORD     fdwReason,
			_In_ LPVOID    lpvReserved) {

if (fdwReason == DLL_PROCESS_ATTACH)
			{
				LoadNapiFunctions(); // Custom "delay load" implementation of the Node functions.
				_module = {
					NAPI_MODULE_VERSION,
					0,
					__FILE__,
					Init,
					"typescript-etw",
					0,
					{0},
				};

pnapi_module_register(&_module);
				return true;
			}
		}
	}
}  // namespace typescript_etw