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use crate::{
interpreter::Interpreter,
loader::{Function, Loader},
};
use move_binary_format::file_format::Bytecode;
use move_vm_types::values::{self, Locals};
use std::{
collections::BTreeSet,
io::{self, Write},
str::FromStr,
};
#[derive(Debug)]
enum DebugCommand {
PrintStack,
Step,
Continue,
Breakpoint(String),
DeleteBreakpoint(String),
PrintBreakpoints,
}
impl DebugCommand {
pub fn debug_string(&self) -> &str {
match self {
Self::PrintStack => "stack",
Self::Step => "step",
Self::Continue => "continue",
Self::Breakpoint(_) => "breakpoint ",
Self::DeleteBreakpoint(_) => "delete ",
Self::PrintBreakpoints => "breakpoints",
}
}
pub fn commands() -> Vec<DebugCommand> {
vec![
Self::PrintStack,
Self::Step,
Self::Continue,
Self::Breakpoint("".to_string()),
Self::DeleteBreakpoint("".to_string()),
Self::PrintBreakpoints,
]
}
}
impl FromStr for DebugCommand {
type Err = String;
fn from_str(s: &str) -> Result<Self, Self::Err> {
use DebugCommand::*;
let s = s.trim();
if s.starts_with(PrintStack.debug_string()) {
return Ok(PrintStack);
}
if s.starts_with(Step.debug_string()) {
return Ok(Step);
}
if s.starts_with(Continue.debug_string()) {
return Ok(Continue);
}
if let Some(breakpoint) = s.strip_prefix(Breakpoint("".to_owned()).debug_string()) {
return Ok(Breakpoint(breakpoint.to_owned()));
}
if let Some(breakpoint) = s.strip_prefix(DeleteBreakpoint("".to_owned()).debug_string()) {
return Ok(DeleteBreakpoint(breakpoint.to_owned()));
}
if s.starts_with(PrintBreakpoints.debug_string()) {
return Ok(PrintBreakpoints);
}
Err(format!(
"Unrecognized command: {}\nAvailable commands: {}",
s,
Self::commands()
.iter()
.map(|command| command.debug_string())
.collect::<Vec<_>>()
.join(", ")
))
}
}
#[derive(Debug)]
pub(crate) struct DebugContext {
breakpoints: BTreeSet<String>,
should_take_input: bool,
}
impl DebugContext {
pub(crate) fn new() -> Self {
Self {
breakpoints: BTreeSet::new(),
should_take_input: true,
}
}
pub(crate) fn debug_loop(
&mut self,
function_desc: &Function,
locals: &Locals,
pc: u16,
instr: &Bytecode,
resolver: &Loader,
interp: &Interpreter,
) {
let instr_string = format!("{:?}", instr);
let function_string = function_desc.pretty_string();
let breakpoint_hit = self.breakpoints.contains(&function_string)
|| self
.breakpoints
.iter()
.any(|bp| instr_string[..].starts_with(bp.as_str()));
if self.should_take_input || breakpoint_hit {
self.should_take_input = true;
if breakpoint_hit {
let bp_match = self
.breakpoints
.iter()
.find(|bp| instr_string.starts_with(bp.as_str()))
.unwrap()
.clone();
println!(
"Breakpoint {} hit with instruction {}",
bp_match, instr_string
);
}
println!(
"function >> {}\ninstruction >> {:?}\nprogram counter >> {}",
function_string, instr, pc
);
loop {
print!("> ");
std::io::stdout().flush().unwrap();
let mut input = String::new();
match io::stdin().read_line(&mut input) {
Ok(_) => match input.parse::<DebugCommand>() {
Err(err) => println!("{}", err),
Ok(command) => match command {
DebugCommand::Step => {
self.should_take_input = true;
break;
}
DebugCommand::Continue => {
self.should_take_input = false;
break;
}
DebugCommand::Breakpoint(breakpoint) => {
self.breakpoints.insert(breakpoint.to_string());
}
DebugCommand::DeleteBreakpoint(breakpoint) => {
self.breakpoints.remove(&breakpoint);
}
DebugCommand::PrintBreakpoints => self
.breakpoints
.iter()
.enumerate()
.for_each(|(i, bp)| println!("[{}] {}", i, bp)),
DebugCommand::PrintStack => {
let mut s = String::new();
interp.debug_print_stack_trace(&mut s, resolver).unwrap();
println!("{}", s);
println!("Current frame: {}\n", function_string);
let code = function_desc.code();
println!(" Code:");
for (i, instr) in code.iter().enumerate() {
if i as u16 == pc {
println!(" > [{}] {:?}", pc, instr);
} else {
println!(" [{}] {:?}", i, instr);
}
}
println!(" Locals:");
if function_desc.local_count() > 0 {
let mut s = String::new();
values::debug::print_locals(&mut s, locals).unwrap();
println!("{}", s);
} else {
println!(" (none)");
}
}
},
},
Err(err) => {
println!("Error reading input: {}", err);
break;
}
}
}
}
}
}