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|
use bedrock_core::*;
use std::path::Path;
use std::time::Instant;
const NORMAL: &str = "\x1b[0m";
const DIM: &str = "\x1b[2m";
const YELLOW: &str = "\x1b[33m";
const BLUE: &str = "\x1b[34m";
pub struct DebugState {
pub enabled: bool,
last_cycle: usize,
last_mark: Instant,
symbols: DebugSymbols,
}
impl DebugState {
pub fn new<P: AsRef<Path>>(enabled: bool, symbols_path: Option<P>) -> Self {
Self {
enabled,
last_cycle: 0,
last_mark: Instant::now(),
symbols: DebugSymbols::from_path_opt(symbols_path),
}
}
pub fn debug_summary(&mut self, core: &BedrockCore) {
if self.enabled {
let prev_pc = core.mem.pc.wrapping_sub(1);
eprintln!("\n PC: 0x{:04x} Cycles: {} (+{} in {:.2?})",
prev_pc, core.cycle,
core.cycle.saturating_sub(self.last_cycle),
self.last_mark.elapsed(),
);
eprint!("WST: ");
debug_stack(&core.wst, 0x10);
eprint!("RST: ");
debug_stack(&core.rst, 0x10);
// Print information about the closest symbol.
if let Some(symbol) = self.symbols.for_address(prev_pc) {
let name = &symbol.name;
let address = &symbol.address;
eprint!("SYM: {BLUE}@{name}{NORMAL} 0x{address:04x}");
if let Some(location) = &symbol.location {
eprint!(" {DIM}{location}{NORMAL}");
}
eprintln!();
}
}
self.last_cycle = core.cycle;
self.last_mark = Instant::now();
}
}
fn debug_stack(stack: &Stack, len: usize) {
for i in 0..len {
if i == stack.sp as usize { eprint!("{YELLOW}"); }
eprint!("{:02x} ", stack.mem[i]);
}
eprintln!("{NORMAL}");
}
struct DebugSymbols {
symbols: Vec<DebugSymbol>
}
impl DebugSymbols {
/// Load debug symbols from a symbols file.
pub fn from_path_opt<P: AsRef<Path>>(path: Option<P>) -> Self {
let mut symbols = Vec::new();
if let Some(path) = path {
if let Ok(string) = std::fs::read_to_string(path) {
for line in string.lines() {
if let Some(symbol) = DebugSymbol::from_line(line) {
symbols.push(symbol);
}
}
}
}
symbols.sort_by_key(|s| s.address);
Self { symbols }
}
pub fn for_address(&self, address: u16) -> Option<&DebugSymbol> {
if self.symbols.is_empty() { return None; }
let symbol = match self.symbols.binary_search_by_key(&address, |s| s.address) {
Ok(index) => self.symbols.get(index)?,
Err(index) => self.symbols.get(index.checked_sub(1)?)?,
};
Some(&symbol)
}
}
struct DebugSymbol {
address: u16,
name: String,
location: Option<String>,
}
impl DebugSymbol {
pub fn from_line(line: &str) -> Option<Self> {
if let Some((address, line)) = line.split_once(' ') {
let address = u16::from_str_radix(address, 16).ok()?;
if let Some((name, location)) = line.split_once(' ') {
let name = name.to_string();
let location = Some(location.to_string());
Some( DebugSymbol { address, name, location } )
} else {
let name = line.to_string();
Some( DebugSymbol { address, name, location: None } )
}
} else {
None
}
}
}
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