[libposix] achieve simple c reflection

Author: gozfree

build/cmake_env.inc

@@ -7,29 +7,30 @@ SET(EXECUTABLE_OUTPUT_PATH ${PROJECT_BINARY_DIR}/build/bin)
 SET(TD_TESTS_OUTPUT_DIR ${PROJECT_BINARY_DIR}/test)
 
 MESSAGE(STATUS "============= Compile Env ============= ")
-MESSAGE(STATUS " CPU Info:    " ${CMAKE_SYSTEM_PROCESSOR})
-MESSAGE(STATUS "  OS Info:    " ${CMAKE_SYSTEM_NAME}-${CMAKE_SYSTEM_VERSION})
-MESSAGE(STATUS "Host Info:    " ${CMAKE_HOST_SYSTEM_NAME})
-MESSAGE(STATUS "C COMPILER:   " ${CMAKE_C_COMPILER_ID}-${CMAKE_C_COMPILER_VERSION})
-MESSAGE(STATUS "============= Compile Env ============= ")
-
-MESSAGE(STATUS "============= Project Info ============= ")
-MESSAGE(STATUS "src directory:          " ${PROJECT_SOURCE_DIR})
-MESSAGE(STATUS "binary output path:     " ${PROJECT_BINARY_DIR})
-MESSAGE(STATUS "executable output path: " ${EXECUTABLE_OUTPUT_PATH})
-MESSAGE(STATUS "library output path:    " ${LIBRARY_OUTPUT_PATH})
-MESSAGE(STATUS "============= Project Info ============= ")
+MESSAGE(STATUS "  CPU Info:    " ${CMAKE_SYSTEM_PROCESSOR})
+MESSAGE(STATUS "   Host OS:    " ${CMAKE_HOST_SYSTEM_NAME}-${CMAKE_SYSTEM_VERSION})
+MESSAGE(STATUS " CMake VER:    " ${CMAKE_MAJOR_VERSION}-${CMAKE_MINOR_VERSION}-${CMAKE_PATCH_VERSION})
+MESSAGE(STATUS "C COMPILER:    " ${CMAKE_C_COMPILER_ID}-${CMAKE_C_COMPILER_VERSION})
 
 IF ("${CMAKE_SYSTEM_NAME}" MATCHES "Linux")
   SET(OS_LINUX TRUE)
-  MESSAGE(STATUS "env is OS_LINUX")
+  MESSAGE(STATUS " Target OS:    LINUX")
 ELSEIF ("${CMAKE_SYSTEM_NAME}" MATCHES "Windows")
   SET(OS_WINDOWS TRUE)
-  MESSAGE(STATUS "env is OS_WINDOWS")
+  MESSAGE(STATUS " Target OS:    WINDOWS")
 ELSEIF (("${CMAKE_SYSTEM_NAME}" MATCHES "MSYS") OR ("${CMAKE_SYSTEM_NAME}" MATCHES "MINGW32"))
   SET(OS_WINDOWS TRUE)
   SET(ENV_MINGW TRUE)
-  MESSAGE(STATUS "env is OS_WINDOWS with MINGW")
+  MESSAGE(STATUS " Target OS:    WINDOWS with MINGW")
 ELSE ()
-  MESSAGE(STATUS "check env unknown ${CMAKE_SYSTEM_NAME}")
+  MESSAGE(STATUS " Target OS:    unknown ${CMAKE_SYSTEM_NAME}")
+  EXIT ()
 ENDIF ()
+MESSAGE(STATUS "======================================= ")
+
+MESSAGE(STATUS "============= Project Info ============= ")
+MESSAGE(STATUS "       src path: " ${PROJECT_SOURCE_DIR})
+MESSAGE(STATUS "bin output path: " ${PROJECT_BINARY_DIR})
+MESSAGE(STATUS "exe output path: " ${EXECUTABLE_OUTPUT_PATH})
+MESSAGE(STATUS "lib output path: " ${LIBRARY_OUTPUT_PATH})
+MESSAGE(STATUS "======================================== ")

gear-lib/libposix/libposix.h

@@ -260,6 +260,31 @@ GEAR_API size_t wcs_to_utf8_ptr(const wchar_t *str, size_t len, char **pstr);
 GEAR_API size_t utf8_to_mbs_ptr(const char *str, size_t len, char **pstr);
 GEAR_API size_t mbs_to_utf8_ptr(const char *str, size_t len, char **pstr);
 
+/*
+ * simple reflection c version realization
+ */
+typedef void (*void_fn)(void);
+struct reflect {
+    void_fn fn;
+    const char* name;
+};
+struct reflect __start_reflect;
+struct reflect __stop_reflect;
+
+#define REFLECT_DEF(x) __attribute__((section("reflect"), aligned(sizeof(void*)))) \
+            struct reflect __##x = {(void_fn)x, #x};
+
+#define REFLECT_CALL(type, x, ...)                                            \
+    do {                                                                      \
+        struct reflect *_r = NULL;                                            \
+        for (_r = &__start_reflect; _r < &__stop_reflect; _r++) {             \
+            if (strcmp(_r->name, x) == 0) {                                   \
+                type __fn = (type)_r->fn;                                     \
+                __fn(__VA_ARGS__);                                            \
+            }                                                                 \
+        }                                                                     \
+    } while (0)
+
 #ifdef __cplusplus
 }
 #endif

gear-lib/libposix/test_libposix.c

@@ -21,13 +21,31 @@
  ******************************************************************************/
 #include "libposix.h"
 #include <stdio.h>
+#include <stdlib.h>
 #include <unistd.h>
 #include <pthread.h>
 #include <errno.h>
 #define __STDC_FORMAT_MACROS
 #include <inttypes.h>
 #include <sys/stat.h>
 
+typedef int (*add2_fn)(char* a, char* b);
+typedef int (*add3_fn)(char* a, char* b, char *c);
+
+int add2(char* a, char* b)
+{
+    printf("%d+%d=%d\n", atoi(a), atoi(b), atoi(a) + atoi(b));
+    return atoi(a) + atoi(b);
+}
+REFLECT_DEF(add2);
+
+int add3(char* a, char* b, char *c)
+{
+    printf("%d+%d+%d=%d\n", atoi(a), atoi(b), atoi(c), atoi(a) + atoi(b) + atoi(c));
+    return atoi(a) + atoi(b) + atoi(c);
+}
+REFLECT_DEF(add3);
+
 static void *thread_func(void *arg)
 {
     printf("this is thread\n");
@@ -69,5 +87,9 @@ void foo()
 int main(int argc, char **argv)
 {
     foo();
+
+    REFLECT_CALL(add2_fn, "add2", "4", "2");
+    REFLECT_CALL(add3_fn, "add3", "1", "4", "2");
+
     return 0;
 }