Add test for dlopen

Author: MoritzGoeckel

lib/libprint.cpp

@@ -0,0 +1,9 @@
+#include <stdio.h>
+#include <stdlib.h>
+
+// To avoid renaming the function in the exported symbols
+extern "C" {
+    void myprint();
+}
+
+void myprint() { printf("It's working!\n"); }

lib/print.c

@@ -28,15 +28,17 @@ ifdef OS
 	# Windows
 	EXECUTE_FILE_TARGET := ${BINDIR}/executefile.exe
 	TESTS_TARGET := ${BINDIR}/tests.exe
+	LIB_TARGET := ${BINDIR}/libprint.dll
 else
 	# Unix
 	EXECUTE_FILE_TARGET := ${BINDIR}/executefile
 	TESTS_TARGET := ${BINDIR}/tests
+	LIB_TARGET := ${BINDIR}/libprint.so
 endif
 
 EXES := ${EXECUTE_FILE_TARGET} ${TESTS_TARGET}
 
-Build: BuildExecuteFile BuildTests
+Build: BuildExecuteFile BuildTests Lib
 
 BuildExecuteFile: $(OBJS) $(MAINDIR)/ExecuteFile.o | bin
 	$(CXX) $(CXXFLAGS) $(CPPFLAGS) -o ${EXECUTE_FILE_TARGET} $^
@@ -64,3 +66,5 @@ else
 	$(foreach file, $(EXES), rm ${file};)
 endif
 
+Lib: lib/libprint.cpp | bin
+	$(CXX) $(CXXFLAGS) -shared -fPIC $(CPPFLAGS) -o ${LIB_TARGET} $<

makefile

@@ -120,7 +120,34 @@ void testFile(std::string path){
     std::cout << "[ OK ] " << path << std::endl;
 }
 
-int main() {
+// TODO
+#include <dlfcn.h>
+
+void testLibrary(){
+    std::cout << "Testing library..." << std::endl;
+
+    void* handle = dlopen("bin/libprint.so", RTLD_LAZY);
+    if (!handle) {
+        std::cerr << "Error: " << dlerror() << std::endl;
+        throwConstraintViolated("Failed to load library");
+    }
+
+    dlerror(); // Clear any existing error
+
+    void (*myprint)() = (void (*)())dlsym(handle, "myprint");
+    const char* dlsym_error = dlerror();
+    if (dlsym_error) {
+        std::cerr << "Error: " << dlsym_error << std::endl;
+        dlclose(handle);
+        throwConstraintViolated("Failed to find symbol in library");
+    }
+    myprint(); // Call the function from the library
+    dlclose(handle); // Close the library handle
+
+    std::cout << "[ OK ] Library test passed." << std::endl;
+}
+
+void suiteTestfiles(){
     testFile("mfiles/addition_infix.m");
     testFile("mfiles/addition.m");
     testFile("mfiles/broken_syntax.m");
@@ -145,7 +172,11 @@ int main() {
     testFile("mfiles/type_annotation.m");
     testFile("mfiles/struct.m");
     testFile("mfiles/struct_nested.m");
+}
 
+int main() {
+    suiteTestfiles();
+    testLibrary();
     // Structs:
     //    member functions for structs
 
@@ -154,6 +185,8 @@ int main() {
     // blob type (alloc8, size, get(blob, idx), set(blob, idx)):
     //    synatx sugar for get, set with []
 
+    // C-Strings / strings
+
     // Use blob and struct to implement:
     //   arrays
     //   strings