programmatically create switch cases for opcodes based on opcode json

The JSON is from https://github.com/ericTheEchidna/65C02-JSON/ and
saved me a lot of time from writing the cases for each opcode by hand.

1 files changed, 39 insertions, 0 deletions

diff --git a/converter.py b/converter.py
new file mode 100644
index 0000000..da9d8cd
--- /dev/null
+++ b/converter.py
@@ -0,0 +1,39 @@
+import json
+
+address_mode_table = {
+	'Implied': 'AM_ACC',
+	'Immediate': 'AM_IMM',
+	'Zero Page': 'AM_ZP',
+	'Zero Page, X': 'AM_ZP_X',
+	'Zero Page, Y': 'AM_ZP_Y',
+	'Absolute': 'AM_ABS',
+	'Absolute, X': 'AM_ABS_X',
+	'Absolute, Y': 'AM_ABS_Y',
+	'Indirect': 'AM_IND',
+	'(Indirect)': 'AM_IND',
+	'(Indirect, X)': 'AM_IND_X',
+	'(Indirect), Y': 'AM_IND_Y',
+}
+
+# https://github.com/ericTheEchidna/65C02-JSON/
+j = json.load(open('opcodes_65c02.json', 'r'))
+
+#print(j)
+
+for i in j:
+	#print(i)
+	instruction = str.lower(i["instruction"])
+	for op in i["opcodes"]:
+		address_mode = i["opcodes"][op]["address_mode"]
+		if "Bit " in address_mode:
+			am = 'AM_REL'
+		else:
+			am = address_mode_table[address_mode]
+
+		bytes = i["opcodes"][op]["bytes"]
+		cycles = i["opcodes"][op]["cycles"]
+
+		print(f'''case {op}:
+	{instruction}(opcode_arg({am}));
+	cycles += {cycles};
+	break;''')