gb-emu: initial commit

Add a mostly non-functional Gameboy CPU and the skeleton
of a Gameboy assembler intended for unit tests.

src/apps/gbasm-test.c

@@ -0,0 +1,79 @@
+#include "gbasm/assemble.h"
+#include "gbasm/emitter.h"
+#include "tests/gbasm/test.h"
+#include "tests/gbasm/inc.h"
+#include "tests/gbasm/fixed.h"
+#include "common.h"
+
+#include <string.h> /* memset */
+#include <glib.h>
+
+const static struct gbasm_tests *tests[] = {
+	&gbasm_fixed_tests,
+	&gbasm_inc_tests,
+};
+
+static int cmp_mem(const uint8_t *test_data, const uint8_t *expected_data, size_t len)
+{
+	for (size_t i = 0; i < len; i++) {
+		if (test_data[i] != expected_data[i]) {
+			g_test_message("memory contents differed at index %zu, data=%x, expected=%x",
+			               i, test_data[i], expected_data[i]);
+			return -1;
+		}
+	}
+
+	return 0;
+}
+
+static void run_test(const void *test_data)
+{
+	static uint8_t program[4096];
+	const struct gbasm_test *test = test_data;
+	struct emitter emitter;
+	struct buffer_emitter buffer_emitter;
+	char *src;         
+	int rc;
+	size_t len;
+
+	src = strdup(test->asm_source);
+	
+	memset(program, 0, sizeof(program));
+	buffer_emitter_init(&emitter, &buffer_emitter, program, sizeof(program));
+	
+	rc = gbasm_assemble(src, &emitter);
+	g_assert_cmpint(rc, ==, 0);
+
+	len = test->expected_output_len;
+
+	if (len != buffer_emitter.cursor) {
+		g_warning("output lengths were not equal expected %zu, actual %zu",
+		          len, buffer_emitter.cursor);
+		g_test_fail();
+		len = MIN(len, buffer_emitter.cursor);
+	}
+
+	rc = cmp_mem(program, test->expected_output, len);
+	g_assert_cmpint(rc, ==, 0);
+
+	free(src);
+}
+
+int main(int argc, char **argv)
+{
+	char test_name_buff[256];
+
+	g_test_init(&argc, &argv, NULL);
+	
+	for (int i = 0; i < ARRAY_SIZE(tests); i++) {
+		for (int j = 0; j < tests[i]->num_tests; j++) {
+			snprintf(test_name_buff, sizeof(test_name_buff),
+			         "/gbasm/%s/%s",
+			         tests[i]->name,
+			         tests[i]->tests[j]->name);
+			g_test_add_data_func(test_name_buff, tests[i]->tests[j], run_test);
+		}
+	}
+	
+	return g_test_run();
+}