Add more checks about the imports of wasm_instance_new (#1843)

Check whether the `imports` argument is NULL in wasm_instance_new and check
the import count of each kind.

Fix issue reported by https://github.com/bytecodealliance/wasm-micro-runtime/issues/1833

samples/wasm-c-api/CMakeLists.txt

@@ -159,6 +159,9 @@ endif()
 
 check_pie_supported()
 
+include(CTest)
+enable_testing()
+
 foreach(EX ${EXAMPLES})
   set(SRC ${CMAKE_CURRENT_LIST_DIR}/src/${EX}.c)
 
@@ -193,6 +196,12 @@ foreach(EX ${EXAMPLES})
     )
     add_dependencies(${EX} ${EX}_AOT)
   endif()
+
+  # run `ctest --test-dir build`
+  add_test(NAME Test_${EX}
+    COMMAND ./${EX}
+    WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
+  )
 endforeach()
 
 if (CMAKE_BUILD_TYPE STREQUAL "Debug")
@@ -201,19 +210,5 @@ if (CMAKE_BUILD_TYPE STREQUAL "Debug")
     REQUIRED
   )
 
-  if(VALGRIND)
-    foreach(EX ${EXAMPLES})
-      add_custom_command(
-        OUTPUT ${EX}_leak_check.report
-        DEPENDS ${EX} ${EX}_WASM
-        COMMAND ${VALGRIND} --tool=memcheck --leak-check=full -- ./${EX} > ${EX}_leak_check.report 2>&1
-        WORKING_DIRECTORY ${CMAKE_BINARY_DIR}
-      )
-      add_custom_target(${EX}_LEAK_TEST ALL
-        DEPENDS ${EX}_leak_check.report
-        COMMAND grep "All heap blocks were freed -- no leaks are possible" ${EX}_leak_check.report
-        COMMENT "Please read ${EX}_leak_check.report when meeting Error"
-      )
-    endforeach()
-  endif (VALGRIND)
-endif (CMAKE_BUILD_TYPE STREQUAL "Debug")
+  # run `ctest -T memcheck -V --test-dir build`
+endif()

samples/wasm-c-api/src/callback_chain.c

@@ -238,7 +238,7 @@ main(int argc, const char *argv[])
     IMPORT_FUNCTION_LIST(CREATE_WASM_FUNCTION)
 #undef CREATE_WASM_FUNCTION
 
-    wasm_extern_t *fs[10] = { 0 };
+    wasm_extern_t *fs[2] = { 0 };
 #define ADD_TO_FUNCTION_LIST(name, index, ...) \
     fs[index] = wasm_func_as_extern(function_##name);
     IMPORT_FUNCTION_LIST(ADD_TO_FUNCTION_LIST)