From a275deb6abe868a7ee1051b64e9a324c2bf1ec4d Mon Sep 17 00:00:00 2001
From: Stephen Crane <jscrane@gmail.com>
Date: Sun, 24 Feb 2019 11:50:10 +0000
Subject: [PATCH] NO_CHECKPOINT flag

---
 filer.cpp        | 2 ++
 hardware.cpp     | 2 ++
 i8080.cpp        | 4 ++++
 r6502.cpp        | 4 ++++
 ram.h            | 2 ++
 serial_filer.cpp | 2 ++
 spiram.cpp       | 4 ++++
 z80.cpp          | 4 ++++
 8 files changed, 24 insertions(+)

diff --git a/filer.cpp b/filer.cpp
index 18716e8..80a7f75 100644
--- a/filer.cpp
+++ b/filer.cpp
@@ -104,6 +104,7 @@ const char *flash_filer::rewind() {
 	return advance();
 }
 
+#if !defined(NO_CHECKPOINT)
 static char buf[32];
 static char chkpt[] = { "CHKPOINT" };
 static int cpid = 0;
@@ -146,3 +147,4 @@ void flash_filer::restore(const char *filename) {
 #endif
 	start(::programs);
 }
+#endif
diff --git a/hardware.cpp b/hardware.cpp
index 56b2e06..ffdb10f 100644
--- a/hardware.cpp
+++ b/hardware.cpp
@@ -79,6 +79,7 @@ void hardware_init(CPU &cpu) {
 #endif
 }
 
+#if !defined(NO_CHECKPOINT)
 void hardware_checkpoint(Stream &s) {
 	unsigned ds = 0;
 	for (unsigned i = 0; i < 0x10000; i += ds) {
@@ -98,3 +99,4 @@ void hardware_restore(Stream &s) {
 	}
 	_cpu->restore(s);
 }
+#endif
diff --git a/i8080.cpp b/i8080.cpp
index da9e9f4..0352d23 100644
--- a/i8080.cpp
+++ b/i8080.cpp
@@ -47,6 +47,7 @@ char *i8080::status(char *buf, size_t n, bool hdr) {
 }
 
 void i8080::checkpoint(Stream &s) {
+#if !defined(NO_CHECKPOINT)
 	s.write(A);
 	s.write(SR);
 	s.write(BC);
@@ -55,9 +56,11 @@ void i8080::checkpoint(Stream &s) {
 	s.write(PC);
 	s.write(SP);
 	s.write(_irq_pending);
+#endif
 }
 
 void i8080::restore(Stream &s) {
+#if !defined(NO_CHECKPOINT)
 	A = s.read();
 	SR = s.read();
 	BC = s.read();
@@ -66,6 +69,7 @@ void i8080::restore(Stream &s) {
 	PC = s.read();
 	SP = s.read();
 	_irq_pending = s.read();
+#endif
 }
 
 void i8080::daa() {
diff --git a/r6502.cpp b/r6502.cpp
index d0e7664..b7b004f 100644
--- a/r6502.cpp
+++ b/r6502.cpp
@@ -38,6 +38,7 @@ char *r6502::status(char *buf, size_t n, bool hdr) {
 
 void r6502::checkpoint(Stream &s)
 {
+#if !defined(NO_CHECKPOINT)
 	s.write(PC / 0xff);
 	s.write(PC % 0xff);
 	s.write(S);
@@ -52,10 +53,12 @@ void r6502::checkpoint(Stream &s)
 	s.write(Z);
 	s.write(C);
 	s.write(P.flags);
+#endif
 }
 
 void r6502::restore(Stream &s)
 {
+#if !defined(NO_CHECKPOINT)
 	uint8_t hi = s.read(), lo = s.read();
 	PC = hi * 0xff + lo;
 	S = s.read();
@@ -70,6 +73,7 @@ void r6502::restore(Stream &s)
 	Z = s.read();
 	C = s.read();
 	P.flags = s.read();
+#endif
 }
 
 void r6502::raise(int level) {
diff --git a/ram.h b/ram.h
index 2c4547b..f88cc94 100644
--- a/ram.h
+++ b/ram.h
@@ -6,8 +6,10 @@ public:
 	virtual void operator= (uint8_t c) { _mem[_acc] = c; }
 	virtual operator uint8_t () { return _mem[_acc]; }
 
+#if !defined NO_CHECKPOINT
 	virtual void checkpoint(Stream &s) { s.write(_mem, sizeof(_mem)); }
 	virtual void restore(Stream &s) { s.readBytes((char *)_mem, sizeof(_mem)); }
+#endif
 
 	ram (): Memory::Device(sizeof(_mem)) {}
 
diff --git a/serial_filer.cpp b/serial_filer.cpp
index fb57da3..a307200 100644
--- a/serial_filer.cpp
+++ b/serial_filer.cpp
@@ -35,6 +35,7 @@ bool serial_filer::more() {
 	return Serial.available() > 0;
 }
 
+#if !defined(NO_CHECKPOINT)
 const char *serial_filer::checkpoint() {
 	// FIXME
 	return 0;
@@ -43,3 +44,4 @@ const char *serial_filer::checkpoint() {
 void serial_filer::restore(const char *) {
 	// FIXME
 }
+#endif
diff --git a/spiram.cpp b/spiram.cpp
index 6f0452a..8ca5a14 100644
--- a/spiram.cpp
+++ b/spiram.cpp
@@ -22,20 +22,24 @@ spiram::operator uint8_t()
 
 void spiram::checkpoint(Stream &s)
 {
+#if !defined(NO_CHECKPOINT)
 	uint8_t buf[Memory::page_size];
 	for (unsigned i = 0; i < pages(); i++) {
 		spiRam.read_stream(i * 256, buf, sizeof(buf));
 		s.write(buf, sizeof(buf));
 	}
+#endif
 }
 
 void spiram::restore(Stream &s)
 {
+#if !defined(NO_CHECKPOINT)
 	uint8_t buf[Memory::page_size];
 	for (unsigned i = 0; i < pages(); i++) {
 		s.readBytes((char *)buf, sizeof(buf));
 		spiRam.write_stream(i * 256, buf, sizeof(buf));
 	}
+#endif
 }
 
 #endif
diff --git a/z80.cpp b/z80.cpp
index 26b65da..ce37fd7 100644
--- a/z80.cpp
+++ b/z80.cpp
@@ -20,6 +20,7 @@ char *z80::status(char *buf, size_t n, bool hdr) {
 }
 
 void z80::checkpoint(Stream &s) {
+#if !defined(NO_CHECKPOINT)
 	s.write(AF);
 	s.write(BC);
 	s.write(DE);
@@ -39,9 +40,11 @@ void z80::checkpoint(Stream &s) {
 	s.write(_ts);
 	s.write(_halted);
 	s.write(_irq_pending);
+#endif
 }
 
 void z80::restore(Stream &s) {
+#if !defined(NO_CHECKPOINT)
 	AF = s.read();
 	BC = s.read();
 	DE = s.read();
@@ -61,6 +64,7 @@ void z80::restore(Stream &s) {
 	_ts = s.read();
 	_halted = s.read();
 	_irq_pending = s.read();
+#endif
 }
 
 uint8_t z80::_fetch_op() {