Initial commit

1 files changed, 105 insertions, 0 deletions

diff --git a/src/emulators/headless_emulator.rs b/src/emulators/headless_emulator.rs
new file mode 100644
index 0000000..cac58cf
--- /dev/null
+++ b/src/emulators/headless_emulator.rs
@@ -0,0 +1,105 @@
+use crate::*;
+
+
+pub struct HeadlessEmulator {
+    pub br: BedrockEmulator<HeadlessDeviceBus>,
+    pub debug: DebugState,
+}
+
+impl HeadlessEmulator {
+    pub fn new(config: &EmulatorConfig, debug: bool) -> Self {
+        Self {
+            br: BedrockEmulator::new(HeadlessDeviceBus::new(config)),
+            debug: DebugState::new(debug, config.symbols_path.as_ref()),
+        }
+    }
+
+    pub fn load_program(&mut self, bytecode: &[u8]) {
+        self.br.core.mem.load_program(bytecode);
+    }
+
+    fn sleep(&mut self) {
+        loop {
+            if self.br.dev.wake() { break; }
+            std::thread::sleep(TICK_DURATION);
+        }
+    }
+
+    fn halt(&mut self) {
+        self.br.dev.stream.flush();
+        info!("Program halted, exiting.");
+        self.debug.debug_full(&self.br.core);
+        std::process::exit(0);
+    }
+
+    pub fn run(&mut self) -> ! {
+        loop {
+            if let Some(signal) = self.br.evaluate(BATCH_SIZE, self.debug.enabled) {
+                match signal {
+                    Signal::Fork | Signal::Reset => self.br.reset(),
+                    Signal::Sleep => self.sleep(),
+                    Signal::Halt => self.halt(),
+                    Signal::Debug(debug_signal) => match debug_signal {
+                        Debug::Debug1 => self.debug.debug_full(&self.br.core),
+                        Debug::Debug2 => self.debug.debug_timing(&self.br.core),
+                        _ => (),
+                    }
+                    _ => (),
+                }
+            }
+        }
+    }
+}
+
+
+pub struct HeadlessDeviceBus {
+    pub system: SystemDevice,
+    pub memory: MemoryDevice,
+    pub math:   MathDevice,
+    pub clock:  ClockDevice,
+    pub stream: StreamDevice,
+    pub file:   FileDevice,
+    pub wake_queue: WakeQueue,
+}
+
+impl HeadlessDeviceBus {
+    pub fn new(config: &EmulatorConfig) -> Self {
+        Self {
+            system: SystemDevice::new(0b1111_0000_1100_0000),
+            memory: MemoryDevice::new(),
+            math:   MathDevice::new(),
+            clock:  ClockDevice::new(),
+            stream: StreamDevice::new(&config),
+            file:   FileDevice::new(),
+            wake_queue: WakeQueue::new(),
+        }
+    }
+}
+
+impl DeviceBus for HeadlessDeviceBus {
+    fn get_device(&mut self, slot: u8) -> Option<&mut dyn Device> {
+        match slot {
+            0x0 => Some(&mut self.system),
+            0x1 => Some(&mut self.memory),
+            0x2 => Some(&mut self.math  ),
+            0x3 => Some(&mut self.clock ),
+            0x8 => Some(&mut self.stream),
+            0x9 => Some(&mut self.file  ),
+            _ => None
+        }
+    }
+
+    fn wake(&mut self) -> bool {
+        for slot in self.wake_queue.iter(self.system.wake_mask) {
+            if let Some(device) = self.get_device(slot) {
+                if device.wake() {
+                    self.system.wake_slot = slot;
+                    self.system.asleep = false;
+                    self.wake_queue.wake(slot);
+                    return true;
+                }
+            }
+        }
+        return false;
+    }
+}