feat: cut over to WASM backend

src/linux_fastcgi.cpp

@@ -1,4 +1,5 @@
 #include "lib/uce_lib.cpp"
+#include "wasm/backend.cpp"
 #include <csetjmp>
 #include <deque>
 #include <errno.h>
@@ -940,6 +941,23 @@ int handle_complete(FastCGIRequest& request) {
 				compiler_invoke_cli(&request, request.params["SCRIPT_FILENAME"]);
 			else if(request.params["UCE_SERVE_HTTP"] == "1")
 				compiler_invoke_serve_http(&request, request.params["SCRIPT_FILENAME"], request.params["UCE_SERVE_HTTP_FUNCTION"]);
+			else if(wasm_backend_should_handle(request, compiler_normalize_unit_path(&request, request.params["SCRIPT_FILENAME"])))
+			{
+				// W4/W5: Wasmtime uses host signals internally to implement guest
+				// traps. The native SIGSEGV/SIGILL request recovery handler must not
+				// intercept those, or clean guest traps become native fatal signals.
+				request_fault_active = 0;
+				restore_request_fault_handlers();
+				String wasm_error = wasm_backend_serve(request, compiler_normalize_unit_path(&request, request.params["SCRIPT_FILENAME"]));
+				install_request_fault_handlers();
+				request_fault_active = 1;
+				if(wasm_error != "")
+				{
+					failure_title = "wasm runtime error during request";
+					failure_details = "";
+					failure_trace = wasm_error;
+				}
+			}
 			else
 				compiler_invoke(&request, request.params["SCRIPT_FILENAME"]);
 		}
@@ -1023,6 +1041,7 @@ void on_terminate(int sig)
 	if(getpid() != parent_pid)
 		exit(1);
 	printf("Terminating... PID %i:%i\n", getpid(), parent_pid);
+	wasm_backend_shutdown();
 	server.shutdown();
 	exit(1);
 }