From 96c7c1e4fee261ecf386fb2fff2155f06a2f7973 Mon Sep 17 00:00:00 2001
From: Determinant <ted.sybil@gmail.com>
Date: Mon, 8 Jan 2018 00:32:32 +0800
Subject: support console state load/save (minor bugs still present)

---
 src/mos6502.rs | 28 +++++++++++++++++++++++-----
 1 file changed, 23 insertions(+), 5 deletions(-)

(limited to 'src/mos6502.rs')

diff --git a/src/mos6502.rs b/src/mos6502.rs
index 848dd1f..e8c471f 100644
--- a/src/mos6502.rs
+++ b/src/mos6502.rs
@@ -1,7 +1,10 @@
 #![allow(dead_code)]
 #![allow(unused_macros)]
 
+use core::mem::size_of;
 use memory::{CPUMemory, VMem};
+use utils::{Read, Write, load_prefix, save_prefix};
+
 pub const CPU_FREQ: u32 = 1789773;
 
 #[macro_export]
@@ -588,7 +591,9 @@ enum IntType {
     DelayedNMI
 }
 
+#[repr(C)]
 pub struct CPU<'a> {
+    /*-- begin state --*/
     /* registers */
     a: u8,
     x: u8,
@@ -596,17 +601,22 @@ pub struct CPU<'a> {
     status: u8,
     pc: u16,
     sp: u8,
-    /* internal state */
+    /* internal latches */
     acc: bool,
     opr: u16,
     ea: u16,    /* effective address */
     imm_val: u8,
     pub cycle: u32,
-    //pub elapsed: u32,
     int: Option<IntType>,
+    /*-- end state --*/
+
+    /*-- begin sub-state --*/
     pub mem: CPUMemory<'a>,
+    /*-- end sub-state --*/
 }
 
+const CPU_IGNORED_SIZE: usize = size_of::<CPUMemory>();
+
 macro_rules! make_int {
     ($f:ident, $v: expr) => (
     #[inline(always)]
@@ -654,10 +664,19 @@ impl<'a> CPU<'a> {
             int: None,
             acc: false,
             mem,
-            //elapsed: 0
         }
     }
 
+    pub fn load(&mut self, reader: &mut Read) -> bool {
+        load_prefix(self, CPU_IGNORED_SIZE, reader) &&
+        self.mem.load(reader)
+    }
+
+    pub fn save(&self, writer: &mut Write) -> bool {
+        save_prefix(self, CPU_IGNORED_SIZE, writer) &&
+        self.mem.save(writer)
+    }
+
     pub fn powerup(&mut self) {
         self.cycle = 2;
         self.pc = read16!(self.mem, RESET_VECTOR as u16);
@@ -693,8 +712,7 @@ impl<'a> CPU<'a> {
     }
 
     pub fn tick(&mut self) {
-        self.cycle -= 1;
-        //self.elapsed += 1;
+        self.cycle -= 1
     }
 
     pub fn reset(&mut self) {
-- 
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