From 936167ee9ca2455674020e206267bc4aa2284a4f Mon Sep 17 00:00:00 2001
From: kichikuou <KichikuouChrome@gmail.com>
Date: Sun, 21 Jul 2024 08:16:41 +0900
Subject: [PATCH] VM changes for DALK Gaiden (AIN v0)

- Opcode 0x62 (EOF in later games) is used as SH_STRUCTREF
- The STR0 table does not exist, S_PUSH refers to the MSG0 table instead
---
 src/vm.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/src/vm.c b/src/vm.c
index c735f96..5546c5e 100644
--- a/src/vm.c
+++ b/src/vm.c
@@ -847,6 +847,10 @@ static enum opcode execute_instruction(enum opcode opcode)
 		stack_push(local_get(get_argument(0)).i);
 		break;
 	}
+	case _EOF: // In Ain v0, opcode 0x62 is not EOF but SH_STRUCTREF
+		if (ain->version != 0)
+			VM_ERROR("Illegal opcode: 0x%04x", opcode);
+		// fallthrough
 	case SH_STRUCTREF: { // VARNO
 		stack_push(member_get(get_argument(0)));
 		break;
@@ -1412,7 +1416,10 @@ static enum opcode execute_instruction(enum opcode opcode)
 	// --- Strings ---
 	//
 	case S_PUSH: {
-		stack_push_string(string_ref(ain->strings[get_argument(0)]));
+		if (ain->version == 0)
+			stack_push_string(string_ref(ain->messages[get_argument(0)]));
+		else
+			stack_push_string(string_ref(ain->strings[get_argument(0)]));
 		break;
 	}
 	case S_POP: {