ffi works on linux

Author: MoritzGoeckel

lib/libprint.cpp lib/libtest.cpplib/libprint.cpp renamed to lib/libtest.cpp

@@ -13,6 +13,7 @@ extern "C" {
     int test_iiiiii_i(int a, int b, int c, int d, int e, int f);
     bool test_ii_b(int a, int b);
     bool test_bb_b(bool a, bool b);
+    const char* test_pp_p(char* a, char* b);
 }
 
 void print() { printf("It's working!\n"); }
@@ -63,4 +64,9 @@ bool test_bb_b(bool a, bool b) {
     bool r = a == b;
     printf("Test (%s, %s) -> %s\n", a ? "true" : "false", b ? "true" : "false", r ? "true" : "false");
     return r;
+}
+
+const char* test_pp_p(char* a, char* b) {
+    printf("Test (%s, %s)\n", a, b);
+    return "Hello from C!";
 }

makefile

@@ -28,17 +28,17 @@ ifdef OS
 	# Windows
 	EXECUTE_FILE_TARGET := ${BINDIR}/executefile.exe
 	TESTS_TARGET := ${BINDIR}/tests.exe
-	LIB_TARGET := ${BINDIR}/libprint.dll
+	LIB_TARGET := ${BINDIR}/libtest.dll
 else
 	# Unix
 	EXECUTE_FILE_TARGET := ${BINDIR}/executefile
 	TESTS_TARGET := ${BINDIR}/tests
-	LIB_TARGET := ${BINDIR}/libprint.so
+	LIB_TARGET := ${BINDIR}/libtest.so
 endif
 
 EXES := ${EXECUTE_FILE_TARGET} ${TESTS_TARGET}
 
-Lib: lib/libprint.cpp | bin
+Lib: lib/libtest.cpp | bin
 	$(CXX) $(CXXFLAGS) -shared -fPIC $(CPPFLAGS) -o ${LIB_TARGET} $<
 
 BuildExecuteFile: $(OBJS) $(MAINDIR)/ExecuteFile.o | bin
@@ -67,7 +67,7 @@ else
 	# Linux
 	$(foreach file, $(OBJS), rm ${file};)
 	$(foreach file, $(EXES), rm ${file};)
-	rm bin/libprint.so
+	rm bin/libtest.so
 	rm src/mains/ExecuteFile.o
 	rm src/mains/Tests.o
 endif

src/mains/Tests.cpp

@@ -19,6 +19,12 @@
         throw std::runtime_error("Test failed!"); \
     }
 
+#define EXPECT_FALSE(condition) \
+    if ((condition)) { \
+        std::cerr << __FILE__ << ":" << __LINE__  << " " << __FUNCTION__ << " Expected condition to be false, but it was true." << std::endl; \
+        throw std::runtime_error("Test failed!"); \
+    }
+
 #define EXPECT_TRUE_PRINT(condition, output) \
     if (!(condition)) { \
         std::cerr << __FILE__ << ":" << __LINE__  << " " << __FUNCTION__ << " Expected condition to be true, but it was false." << std::endl; \
@@ -122,11 +128,11 @@ void testFile(std::string path){
 }
 
 void testLibrary(){
-    std::cout << "Testing library..." << std::endl;
+    std::cout << "Testing ffi..." << std::endl;
 
     ffi::ExternalFunctions externalFunctions;
 
-    auto test_ii_i = externalFunctions.add("print", "test_ii_i");
+    auto test_ii_i = externalFunctions.add("test", "test_ii_i");
     {
         ffi::Arguments args;
         args.addDWord(5);
@@ -135,7 +141,7 @@ void testLibrary(){
         EXPECT_EQ(15, r);
     }
 
-    auto test_iii_i = externalFunctions.add("print", "test_iii_i");
+    auto test_iii_i = externalFunctions.add("test", "test_iii_i");
     {
         ffi::Arguments args;
         args.addDWord(5);
@@ -145,7 +151,7 @@ void testLibrary(){
         EXPECT_EQ(30, r);
     }
 
-    auto test_iiii_i = externalFunctions.add("print", "test_iiii_i");
+    auto test_iiii_i = externalFunctions.add("test", "test_iiii_i");
     {
         ffi::Arguments args;
         args.addDWord(5);
@@ -157,7 +163,7 @@ void testLibrary(){
     }
 
 
-    auto test_iiiii_i = externalFunctions.add("print", "test_iiiii_i");
+    auto test_iiiii_i = externalFunctions.add("test", "test_iiiii_i");
     {
         ffi::Arguments args;
         args.addDWord(5);
@@ -169,7 +175,7 @@ void testLibrary(){
         EXPECT_EQ(75, r);
     }
 
-    auto test_iiiiii_i = externalFunctions.add("print", "test_iiiiii_i");
+    auto test_iiiiii_i = externalFunctions.add("test", "test_iiiiii_i");
     {
         ffi::Arguments args;
         args.addDWord(5);
@@ -182,7 +188,48 @@ void testLibrary(){
         EXPECT_EQ(105, r);
     }
 
-    std::cout << "[ OK ] Library test passed." << std::endl;
+    auto test_ii_b = externalFunctions.add("test", "test_ii_b");
+    {
+        ffi::Arguments args;
+        args.addDWord(5);
+        args.addDWord(5);
+        bool r = (bool)externalFunctions.call(test_ii_b, args);
+        EXPECT_TRUE(r); // true
+    }
+
+    {
+        ffi::Arguments args;
+        args.addDWord(5);
+        args.addDWord(6);
+        bool r = (bool)externalFunctions.call(test_ii_b, args);
+        EXPECT_FALSE(r); // true
+    }
+
+    auto test_bb_b = externalFunctions.add("test", "test_bb_b");
+    {
+        ffi::Arguments args;
+        args.addWord(1); // true
+        args.addWord(0); // false
+        bool r = (bool)externalFunctions.call(test_bb_b, args);
+        EXPECT_FALSE(r);
+    }
+
+    auto test_pp_p = externalFunctions.add("test", "test_pp_p");
+    {
+        ffi::Arguments args;
+        std::string a = "Hello";
+        std::string b = "World";
+        args.addQWord(reinterpret_cast<ffi::qword_t>(const_cast<char*>(a.c_str())));
+        args.addQWord(reinterpret_cast<ffi::qword_t>(const_cast<char*>(b.c_str())));
+        auto r = reinterpret_cast<char*>(externalFunctions.call(test_pp_p, args));
+        // compare strings
+        EXPECT_TRUE(r != nullptr);
+        std::string result(r);
+        std::string expected = "Hello from C!";
+        EXPECT_EQ(expected, result);
+    }
+
+    std::cout << "[ OK ] ffi test passed." << std::endl;
 }
 
 void suiteTestfiles(){