[k2] add KML support (#1411)

Previously, we've added a prediction kernel for xgboost and catboost, KML (see #983).
It wasn't supported in runtime-light till the current pull request. It includes:

* move the main inference logic into runtime-common dir
* get rid of exceptions
* gather required globals (mutable buffer, loaded model information) into context
* add php_info() function to write non-warning logs in runtime-common
* make KML functions and types depend on allocator

Co-authored-by: Alexander Polyakov <al.polyakov@vk.team>

Author: mkornaukhov

builtin-functions/kphp-light/stdlib/kml-functions.txt

@@ -1,14 +1,14 @@
 <?php
 
-// ===== UNSUPPORTED =====
-
-/** @kphp-extern-func-info stub generation-required */
-function kml_get_custom_property(string $model_name, string $property_name): ?string;
-/** @kphp-extern-func-info stub generation-required */
 function kml_xgboost_predict_matrix(string $model_name, float[][] $features_map_matrix): ?float[];
 
-/** @kphp-extern-func-info stub generation-required */
+function kml_catboost_predict_vectors(string $model_name, float[] $float_features, string[] $cat_features): ?float;
+function kml_catboost_predict_vectors_multi(string $model_name, float[] $float_features, string[] $cat_features): ?float[];
+function kml_catboost_predict_ht(string $model_name, float[] $features_map): ?float;
+function kml_catboost_predict_ht_multi(string $model_name, float[] $features_map): ?float[];
+
 function kml_model_exists(string $model_name): bool;
+function kml_available_models(): string[];
 
-/** @kphp-extern-func-info stub generation-required */
-function kml_catboost_predict_ht(string $model_name, float[] $features_map): ?float;
+function kml_get_feature_names(string $model_name): ?string[];
+function kml_get_custom_property(string $model_name, string $property_name): ?string;

common/kprintf.cpp

@@ -176,7 +176,7 @@ void kprintf_multiprocessing_mode_enable() {
   kprintf_multiprocessing_mode = 1;
 }
 
-void kprintf_(const char* file, int line, const char* format, ...) {
+void kvprintf_(const char* file, int line, const char* format, va_list ap) {
   const int old_errno = errno;
   struct tm t;
   struct timeval tv;
@@ -201,10 +201,7 @@ void kprintf_(const char* file, int line, const char* format, ...) {
                      t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec, (int)tv.tv_usec, file, line);
     if (n < sizeof(mp_kprintf_buf) - 1) {
       errno = old_errno;
-      va_list ap;
-      va_start(ap, format);
       n += vsnprintf(mp_kprintf_buf + n, sizeof(mp_kprintf_buf) - n, format, ap);
-      va_end(ap);
     }
     if (n >= sizeof(mp_kprintf_buf)) {
       n = sizeof(mp_kprintf_buf) - 1;
@@ -221,13 +218,17 @@ void kprintf_(const char* file, int line, const char* format, ...) {
     fprintf(stderr, "[%d][%4d-%02d-%02d %02d:%02d:%02d.%06d %s %4d] ", getpid(), t.tm_year + 1900, t.tm_mon + 1, t.tm_mday, t.tm_hour, t.tm_min, t.tm_sec,
             (int)tv.tv_usec, file, line);
     errno = old_errno;
-    va_list ap;
-    va_start(ap, format);
     vfprintf(stderr, format, ap);
-    va_end(ap);
   }
 }
 
+void kprintf_(const char* file, int line, const char* format, ...) {
+  va_list args;
+  va_start(args, format);
+  kvprintf_(file, line, format, args);
+  va_end(args);
+}
+
 void send_message_to_assertion_chat_va_list(const char* message, va_list arg_ptr) {
   fprintf(stderr, " Assertion (just warning): ");
   vfprintf(stderr, message, arg_ptr);

common/kprintf.h

@@ -28,7 +28,9 @@ void vkprintf(int verbosity, const char* format, ...) __attribute__((format(prin
 #else
 // print message with timestamp
 void kprintf_(const char* file, int line, const char* format, ...) __attribute__((format(printf, 3, 4)));
+void kvprintf_(const char* file, int line, const char* format, va_list ap);
 #define kprintf(...) kprintf_(__FILE__, __LINE__, __VA_ARGS__)
+#define kvprintf(format, ap) kvprintf_(__FILE__, __LINE__, format, ap)
 #define vkprintf(verbosity_level, format, ...)                                                                                                                 \
   do {                                                                                                                                                         \
     if ((verbosity_level) > verbosity) {                                                                                                                       \

runtime-common/core/utils/kphp-assert-core.h

@@ -6,6 +6,7 @@
 
 // For reporting php logic related errors happened during script execution
 void php_debug(char const* message, ...) __attribute__((format(printf, 1, 2)));
+void php_info(char const* message, ...) __attribute__((format(printf, 1, 2)));
 void php_notice(char const* message, ...) __attribute__((format(printf, 1, 2)));
 void php_warning(char const* message, ...) __attribute__((format(printf, 1, 2)));
 void php_error(char const* message, ...) __attribute__((format(printf, 1, 2)));