Skip tests using objc_msgSend if not available (#263)

* Add __GNUSTEP_MSGSEND__ definition

* Mark test as skipped if return code is 77

* Skip tests using objc_msgSend if not available

* ManyManySelectors: Skip objc_msgSend if not available

* Skip UnexpectedException test on ARM and AArch64

* Add UnexpectedException.m to list of unit tests

* Call manyArgs with objc_msgSend directly

Test/CMakeLists.txt

@@ -51,6 +51,7 @@ set(TESTS
 	hash_table_delete.c
 	hash_test.c
 	setSuperclass.m
+	UnexpectedException.m
 )
 
 set(ENABLE_ALL_OBJC_ARC_TESTS On)
@@ -79,11 +80,6 @@ if (ENABLE_ALL_OBJC_ARC_TESTS)
 	)
 endif()
 
-# UnexpectedException test currently fails on ARM and needs to be fixed
-if(NOT ARCHITECTURE MATCHES "^(arm|aarch64)")
-    list(APPEND TESTS UnexpectedException.m)
-endif()
-
 # List of single-file tests that won't work with the legacy ABI and so
 # shouldn't be run in legacy mode.
 set(NEW_TESTS
@@ -124,6 +120,7 @@ function(addtest_flags TEST_NAME FLAGS TEST_SOURCE)
 		LINK_FLAGS ${INCREMENTAL}
 		LINKER_LANGUAGE C
 	)
+	set_property(TEST ${TEST_NAME} PROPERTY SKIP_RETURN_CODE 77)
 	set_property(TEST ${TEST_NAME} PROPERTY
 		ENVIRONMENT "LD_LIBRARY_PATH=" "LLVM_PROFILE_FILE=${TEST_NAME}.profraw"
 	)

Test/ManyManySelectors.m

@@ -24,6 +24,7 @@ static id x(id self, SEL _cmd)
 
 int main(void)
 {
+
 	SEL nextSel;
 	Class cls = [Test class];
 	assert(cls != Nil);
@@ -46,8 +47,9 @@ int main(void)
 	objc_msg_lookup(cls, nextSel)(cls, nextSel);
 	assert(methodCalled == YES);
 	methodCalled = NO;
+#ifdef __GNUSTEP_MSGSEND__
 	objc_msgSend([Test class], nextSel);
 	assert(methodCalled == YES);
+#endif
 	return 0;
 }
-

Test/UnexpectedException.m

@@ -30,6 +30,7 @@ LONG WINAPI _UnhandledExceptionFilter(struct _EXCEPTION_POINTERS* exceptionInfo)
 
 int main(void)
 {
+	#if !(defined(__arm__) || defined(__ARM_ARCH_ISA_A64))
 #ifdef _WIN32
 	// also verify that an existing handler still gets called after we set ours
 	SetUnhandledExceptionFilter(&_UnhandledExceptionFilter);
@@ -40,4 +41,7 @@ int main(void)
 	assert(0 && "should not be reached!");
 
 	return -1;
+	#endif
+	// FIXME: Test currently fails on ARM and AArch64
+	return 77; // Skip test
 }

Test/objc_msgSend.m

@@ -10,6 +10,7 @@
 
 //#define assert(x) if (!(x)) { printf("Failed %d\n", __LINE__); }
 
+typedef void (*fwdManyFunc)(id, SEL, int, int, int, int, int, int, int, int, int, int, int, float, float, float, float, float, float, float, float, float, float, float);
 
 typedef struct { int a,b,c,d,e; } s;
 @interface Fake
@@ -175,6 +176,7 @@ IMP forward(id o, SEL s)
 
 int main(void)
 {
+#ifdef __GNUSTEP_MSGSEND__
 	__objc_msg_forward2 = forward;
 	__objc_msg_forward3 = forward_slot;
 	TestCls = objc_getClass("MsgTest");
@@ -220,8 +222,12 @@ int main(void)
 	assert(0 == [f dzero]);
 	assert(0 == [f ldzero]);
 	assert(0 == [f fzero]);
-	[TestCls manyArgs: 0 : 1 : 2 : 3: 4: 5: 6: 7: 8: 9: 10 : 0 : 1 : 2 : 3 : 4 : 5 : 6 : 7 : 8 : 9 : 10];
+	// Call manyArgs with objc_msgSend explicitly to test the slow lookup path
+	SEL manyArgsSel = sel_registerName("manyArgs::::::::::::::::::::::");
+  	((fwdManyFunc)objc_msgSend)(TestCls, manyArgsSel, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 0, 1, 2, 3, 4, 5, 6, 7, 8, 9, 10);
 	assert(forwardcalls == 2);
+	[TestCls manyArgs: 0 : 1 : 2 : 3: 4: 5: 6: 7: 8: 9: 10 : 0 : 1 : 2 : 3 : 4 : 5 : 6 : 7 : 8 : 9 : 10];
+	assert(forwardcalls == 3);
 #ifdef BENCHMARK
 	const int iterations = 1000000000;
 	double times[3];
@@ -252,6 +258,8 @@ int main(void)
 	times[2] = ((double)c2 - (double)c1) / (double)CLOCKS_PER_SEC;
 	fprintf(stderr, "Direct IMP call took %f seconds. \n", times[2]);
 	printf("%f\t%f\t%f\n", times[0], times[1], times[2]);
-#endif
+#endif // BENCHMARK
 	return 0;
+#endif // __GNUSTEP_MSGSEND__
+	return 77; // Skip test
 }

objc/message.h

@@ -11,6 +11,12 @@
     defined(__ARM_ARCH_ISA_A64) ||                                             \
     (defined(__riscv) && __riscv_xlen == 64 &&                                 \
      defined(__riscv_float_abi_double))
+
+// Define __GNUSTEP_MSGSEND__ if available
+#ifndef __GNUSTEP_MSGSEND__
+#define __GNUSTEP_MSGSEND__
+#endif
+
 /**
  * Standard message sending function.  This function must be cast to the
  * correct types for the function before use.  The first argument is the