From bc3d54edbc5b6aec58686e66524c99cb49e0d64a Mon Sep 17 00:00:00 2001
From: Max Regan <mgregan2@gmail.com>
Date: Sat, 20 May 2017 16:55:58 -0700
Subject: [PATCH] gbasm: add test for "ld r8, r8"

---
 src/gbasm/tests/ld.c   | 89 ++++++++++++++++++++++++++++++++++++++++++
 src/gbasm/tests/ld.h   |  9 +++++
 src/gbasm/tests/test.c |  2 +
 3 files changed, 100 insertions(+)
 create mode 100644 src/gbasm/tests/ld.c
 create mode 100644 src/gbasm/tests/ld.h

diff --git a/src/gbasm/tests/ld.c b/src/gbasm/tests/ld.c
new file mode 100644
index 0000000..c53d76d
--- /dev/null
+++ b/src/gbasm/tests/ld.c
@@ -0,0 +1,89 @@
+#include "gbasm/tests/test.h"
+#include "common/common.h"
+
+#include <string.h>
+
+void init_r8(void);
+
+static char ld_r8_src[1024] = { 0 };
+
+static uint8_t ld_r8_output[0x40];
+
+struct gbasm_test r8 = {
+	.init = init_r8,
+	.name = "r8",
+	.asm_source = ld_r8_src,
+	.expected_output = ld_r8_output,
+	.expected_output_len = 0,
+};
+
+static const struct gbasm_test *tests[] = {
+	&r8,
+};
+
+struct gbasm_tests gbasm_ld_tests = {
+	.name = "ld",
+	.num_tests = ARRAY_SIZE(tests),
+	.tests = tests,
+};
+
+const char *operands[] = {
+	"B",
+	"C",
+	"D",
+	"E",
+	"H",
+	"L",
+	"(HL)",
+	"A",
+};
+
+void gen_r8_src(void)
+{
+	const char *src, *dst;
+	size_t len = 0;
+
+	for (int i = 0; i < ARRAY_SIZE(operands); i++) {
+		src = operands[i];
+		for (int j = 0; j < ARRAY_SIZE(operands); j++) {
+			dst = operands[j];
+
+			/* Special case, HALT instruction goes where
+			 * "ld (HL), (HL)" would be
+			 */
+			if (strcmp(src, "(HL)") == 0 && strcmp(dst, "(HL)") == 0) {
+				continue;
+			}
+
+			len += sprintf(ld_r8_src + len, "ld %s %s\n", src, dst);
+		}
+	}
+
+	sprintf(ld_r8_src + len, "halt");
+
+	DEBUG_LOG("%s", ld_r8_src);
+}
+
+void gen_r8_output(void)
+{
+	int num_insts = ARRAY_SIZE(operands) * ARRAY_SIZE(operands);
+	int halt_code = 0x76;
+	int i = 0;
+
+	for (int opcode = 0x40; opcode < 0x80; opcode++) {
+		if (opcode == halt_code) {
+			continue;
+		}
+
+		ld_r8_output[i++] = opcode;
+	}
+
+	ld_r8_output[i] = halt_code;
+	r8.expected_output_len = num_insts;
+}
+
+void init_r8(void)
+{
+	gen_r8_src();
+	gen_r8_output();
+}
diff --git a/src/gbasm/tests/ld.h b/src/gbasm/tests/ld.h
new file mode 100644
index 0000000..c9aeef0
--- /dev/null
+++ b/src/gbasm/tests/ld.h
@@ -0,0 +1,9 @@
+#ifndef GBASM_TEST_LD_H
+#define GBASM_TEST_LD_H
+
+#include "gbasm/tests/test.h"
+#include "common/common.h"
+
+extern const struct gbasm_tests gbasm_ld_tests;
+
+#endif
diff --git a/src/gbasm/tests/test.c b/src/gbasm/tests/test.c
index 70adbac..cc1834f 100644
--- a/src/gbasm/tests/test.c
+++ b/src/gbasm/tests/test.c
@@ -3,6 +3,7 @@
 #include "gbasm/tests/test.h"
 #include "gbasm/tests/inc.h"
 #include "gbasm/tests/fixed.h"
+#include "gbasm/tests/ld.h"
 #include "common/common.h"
 
 #include <string.h> /* memset */
@@ -11,6 +12,7 @@
 const static struct gbasm_tests *tests[] = {
 	&gbasm_fixed_tests,
 	&gbasm_inc_tests,
+	&gbasm_ld_tests,
 };
 
 static int cmp_mem(const uint8_t *test_data, const uint8_t *expected_data, size_t len)