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use std::borrow::Cow;
use std::cell::UnsafeCell;
#[cfg(not(feature = "luau"))]
use std::ops::{BitOr, BitOrAssign};
use std::os::raw::c_int;
use ffi::lua_Debug;
use crate::lua::Lua;
use crate::util::{linenumber_to_usize, ptr_to_lossy_str, ptr_to_str};
/// Contains information about currently executing Lua code.
///
/// The `Debug` structure is provided as a parameter to the hook function set with
/// [`Lua::set_hook`]. You may call the methods on this structure to retrieve information about the
/// Lua code executing at the time that the hook function was called. Further information can be
/// found in the Lua [documentation][lua_doc].
///
/// [lua_doc]: https://www.lua.org/manual/5.4/manual.html#lua_Debug
/// [`Lua::set_hook`]: crate::Lua::set_hook
pub struct Debug<'lua> {
lua: &'lua Lua,
ar: ActivationRecord,
#[cfg(feature = "luau")]
level: c_int,
}
impl<'lua> Debug<'lua> {
#[cfg(not(feature = "luau"))]
pub(crate) fn new(lua: &'lua Lua, ar: *mut lua_Debug) -> Self {
Debug {
lua,
ar: ActivationRecord::Borrowed(ar),
}
}
pub(crate) fn new_owned(lua: &'lua Lua, _level: c_int, ar: lua_Debug) -> Self {
Debug {
lua,
ar: ActivationRecord::Owned(UnsafeCell::new(ar)),
#[cfg(feature = "luau")]
level: _level,
}
}
/// Returns the specific event that triggered the hook.
///
/// For [Lua 5.1] `DebugEvent::TailCall` is used for return events to indicate a return
/// from a function that did a tail call.
///
/// [Lua 5.1]: https://www.lua.org/manual/5.1/manual.html#pdf-LUA_HOOKTAILRET
#[cfg(not(feature = "luau"))]
#[cfg_attr(docsrs, doc(cfg(not(feature = "luau"))))]
pub fn event(&self) -> DebugEvent {
unsafe {
match (*self.ar.get()).event {
ffi::LUA_HOOKCALL => DebugEvent::Call,
ffi::LUA_HOOKRET => DebugEvent::Ret,
ffi::LUA_HOOKTAILCALL => DebugEvent::TailCall,
ffi::LUA_HOOKLINE => DebugEvent::Line,
ffi::LUA_HOOKCOUNT => DebugEvent::Count,
event => DebugEvent::Unknown(event),
}
}
}
/// Corresponds to the `n` what mask.
pub fn names(&self) -> DebugNames {
unsafe {
#[cfg(not(feature = "luau"))]
mlua_assert!(
ffi::lua_getinfo(self.lua.state(), cstr!("n"), self.ar.get()) != 0,
"lua_getinfo failed with `n`"
);
#[cfg(feature = "luau")]
mlua_assert!(
ffi::lua_getinfo(self.lua.state(), self.level, cstr!("n"), self.ar.get()) != 0,
"lua_getinfo failed with `n`"
);
DebugNames {
name: ptr_to_lossy_str((*self.ar.get()).name),
#[cfg(not(feature = "luau"))]
name_what: match ptr_to_str((*self.ar.get()).namewhat) {
Some("") => None,
val => val,
},
#[cfg(feature = "luau")]
name_what: None,
}
}
}
/// Corresponds to the `S` what mask.
pub fn source(&self) -> DebugSource {
unsafe {
#[cfg(not(feature = "luau"))]
mlua_assert!(
ffi::lua_getinfo(self.lua.state(), cstr!("S"), self.ar.get()) != 0,
"lua_getinfo failed with `S`"
);
#[cfg(feature = "luau")]
mlua_assert!(
ffi::lua_getinfo(self.lua.state(), self.level, cstr!("s"), self.ar.get()) != 0,
"lua_getinfo failed with `s`"
);
DebugSource {
source: ptr_to_lossy_str((*self.ar.get()).source),
#[cfg(not(feature = "luau"))]
short_src: ptr_to_lossy_str((*self.ar.get()).short_src.as_ptr()),
#[cfg(feature = "luau")]
short_src: ptr_to_lossy_str((*self.ar.get()).short_src),
line_defined: linenumber_to_usize((*self.ar.get()).linedefined),
#[cfg(not(feature = "luau"))]
last_line_defined: linenumber_to_usize((*self.ar.get()).lastlinedefined),
#[cfg(feature = "luau")]
last_line_defined: None,
what: ptr_to_str((*self.ar.get()).what).unwrap_or("main"),
}
}
}
/// Corresponds to the `l` what mask. Returns the current line.
pub fn curr_line(&self) -> i32 {
unsafe {
#[cfg(not(feature = "luau"))]
mlua_assert!(
ffi::lua_getinfo(self.lua.state(), cstr!("l"), self.ar.get()) != 0,
"lua_getinfo failed with `l`"
);
#[cfg(feature = "luau")]
mlua_assert!(
ffi::lua_getinfo(self.lua.state(), self.level, cstr!("l"), self.ar.get()) != 0,
"lua_getinfo failed with `l`"
);
(*self.ar.get()).currentline
}
}
/// Corresponds to the `t` what mask. Returns true if the hook is in a function tail call, false
/// otherwise.
#[cfg(not(feature = "luau"))]
#[cfg_attr(docsrs, doc(cfg(not(feature = "luau"))))]
pub fn is_tail_call(&self) -> bool {
unsafe {
mlua_assert!(
ffi::lua_getinfo(self.lua.state(), cstr!("t"), self.ar.get()) != 0,
"lua_getinfo failed with `t`"
);
(*self.ar.get()).currentline != 0
}
}
/// Corresponds to the `u` what mask.
pub fn stack(&self) -> DebugStack {
unsafe {
#[cfg(not(feature = "luau"))]
mlua_assert!(
ffi::lua_getinfo(self.lua.state(), cstr!("u"), self.ar.get()) != 0,
"lua_getinfo failed with `u`"
);
#[cfg(feature = "luau")]
mlua_assert!(
ffi::lua_getinfo(self.lua.state(), self.level, cstr!("a"), self.ar.get()) != 0,
"lua_getinfo failed with `a`"
);
#[cfg(not(feature = "luau"))]
let stack = DebugStack {
num_ups: (*self.ar.get()).nups as _,
#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
num_params: (*self.ar.get()).nparams as _,
#[cfg(any(feature = "lua54", feature = "lua53", feature = "lua52"))]
is_vararg: (*self.ar.get()).isvararg != 0,
};
#[cfg(feature = "luau")]
let stack = DebugStack {
num_ups: (*self.ar.get()).nupvals as i32,
num_params: (*self.ar.get()).nparams as i32,
is_vararg: (*self.ar.get()).isvararg != 0,
};
stack
}
}
}
enum ActivationRecord {
#[cfg(not(feature = "luau"))]
Borrowed(*mut lua_Debug),
Owned(UnsafeCell<lua_Debug>),
}
impl ActivationRecord {
#[inline]
fn get(&self) -> *mut lua_Debug {
match self {
#[cfg(not(feature = "luau"))]
ActivationRecord::Borrowed(x) => *x,
ActivationRecord::Owned(x) => x.get(),
}
}
}
/// Represents a specific event that triggered the hook.
#[derive(Clone, Copy, Debug, PartialEq, Eq)]
pub enum DebugEvent {
Call,
Ret,
TailCall,
Line,
Count,
Unknown(c_int),
}
#[derive(Clone, Debug)]
pub struct DebugNames<'a> {
/// A (reasonable) name of the function (`None` if the name cannot be found).
pub name: Option<Cow<'a, str>>,
/// Explains the `name` field (can be `global`/`local`/`method`/`field`/`upvalue`/etc).
///
/// Always `None` for Luau.
pub name_what: Option<&'static str>,
}
#[derive(Clone, Debug)]
pub struct DebugSource<'a> {
/// Source of the chunk that created the function.
pub source: Option<Cow<'a, str>>,
/// A "printable" version of `source`, to be used in error messages.
pub short_src: Option<Cow<'a, str>>,
/// The line number where the definition of the function starts.
pub line_defined: Option<usize>,
/// The line number where the definition of the function ends (not set by Luau).
pub last_line_defined: Option<usize>,
/// A string `Lua` if the function is a Lua function, `C` if it is a C function, `main` if it is the main part of a chunk.
pub what: &'static str,
}
#[derive(Copy, Clone, Debug)]
pub struct DebugStack {
pub num_ups: i32,
/// Requires `feature = "lua54/lua53/lua52/luau"`
#[cfg(any(
feature = "lua54",
feature = "lua53",
feature = "lua52",
feature = "luau"
))]
pub num_params: i32,
/// Requires `feature = "lua54/lua53/lua52/luau"`
#[cfg(any(
feature = "lua54",
feature = "lua53",
feature = "lua52",
feature = "luau"
))]
pub is_vararg: bool,
}
/// Determines when a hook function will be called by Lua.
#[cfg(not(feature = "luau"))]
#[cfg_attr(docsrs, doc(cfg(not(feature = "luau"))))]
#[derive(Clone, Copy, Debug, Default)]
pub struct HookTriggers {
/// Before a function call.
pub on_calls: bool,
/// When Lua returns from a function.
pub on_returns: bool,
/// Before executing a new line, or returning from a function call.
pub every_line: bool,
/// After a certain number of VM instructions have been executed. When set to `Some(count)`,
/// `count` is the number of VM instructions to execute before calling the hook.
///
/// # Performance
///
/// Setting this option to a low value can incur a very high overhead.
pub every_nth_instruction: Option<u32>,
}
#[cfg(not(feature = "luau"))]
impl HookTriggers {
/// An instance of `HookTriggers` with `on_calls` trigger set.
pub const ON_CALLS: Self = HookTriggers::new().on_calls();
/// An instance of `HookTriggers` with `on_returns` trigger set.
pub const ON_RETURNS: Self = HookTriggers::new().on_returns();
/// An instance of `HookTriggers` with `every_line` trigger set.
pub const EVERY_LINE: Self = HookTriggers::new().every_line();
/// Returns a new instance of `HookTriggers` with all triggers disabled.
pub const fn new() -> Self {
HookTriggers {
on_calls: false,
on_returns: false,
every_line: false,
every_nth_instruction: None,
}
}
/// Returns an instance of `HookTriggers` with [`on_calls`] trigger set.
///
/// [`on_calls`]: #structfield.on_calls
pub const fn on_calls(mut self) -> Self {
self.on_calls = true;
self
}
/// Returns an instance of `HookTriggers` with [`on_returns`] trigger set.
///
/// [`on_returns`]: #structfield.on_returns
pub const fn on_returns(mut self) -> Self {
self.on_returns = true;
self
}
/// Returns an instance of `HookTriggers` with [`every_line`] trigger set.
///
/// [`every_line`]: #structfield.every_line
pub const fn every_line(mut self) -> Self {
self.every_line = true;
self
}
/// Returns an instance of `HookTriggers` with [`every_nth_instruction`] trigger set.
///
/// [`every_nth_instruction`]: #structfield.every_nth_instruction
pub const fn every_nth_instruction(mut self, n: u32) -> Self {
self.every_nth_instruction = Some(n);
self
}
// Compute the mask to pass to `lua_sethook`.
pub(crate) const fn mask(&self) -> c_int {
let mut mask: c_int = 0;
if self.on_calls {
mask |= ffi::LUA_MASKCALL
}
if self.on_returns {
mask |= ffi::LUA_MASKRET
}
if self.every_line {
mask |= ffi::LUA_MASKLINE
}
if self.every_nth_instruction.is_some() {
mask |= ffi::LUA_MASKCOUNT
}
mask
}
// Returns the `count` parameter to pass to `lua_sethook`, if applicable. Otherwise, zero is
// returned.
pub(crate) const fn count(&self) -> c_int {
match self.every_nth_instruction {
Some(n) => n as c_int,
None => 0,
}
}
}
#[cfg(not(feature = "luau"))]
impl BitOr for HookTriggers {
type Output = Self;
fn bitor(mut self, rhs: Self) -> Self::Output {
self.on_calls |= rhs.on_calls;
self.on_returns |= rhs.on_returns;
self.every_line |= rhs.every_line;
if self.every_nth_instruction.is_none() && rhs.every_nth_instruction.is_some() {
self.every_nth_instruction = rhs.every_nth_instruction;
}
self
}
}
#[cfg(not(feature = "luau"))]
impl BitOrAssign for HookTriggers {
fn bitor_assign(&mut self, rhs: Self) {
*self = *self | rhs;
}
}