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Add macro to define a function and type alias with fake calling convention attributes per platform

This commit is contained in:
William Venner 2021-09-20 20:07:46 +01:00
parent e47f7409e7
commit 27857866c8
1 changed files with 54 additions and 0 deletions
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54
gmod/src/hax.rs
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@ -22,6 +22,60 @@ macro_rules! __vtable_offset {
};
}
#[macro_export]
/// Common pattern for detouring.
/// # Example
/// ```norun
/// __callingconv_func! {
/// #[win32 = "stdcall"]
/// #[win64 = "stdcall"]
/// #[linux32 = "C"]
/// #[linux64 = "C"]
/// CVoiceGameMgrHelper_CanPlayerHearPlayer = extern fn(listener: *mut c_void, talker: *mut c_void) -> bool {
/// println!("listener {:?} talker {:?}", listener, talker);
/// false
/// }
/// }
/// ```
macro_rules! __callingconv_func {
{ @callingconv $ty:ident = extern $callingconv:tt fn($($ident:ident: $arg:ty),*) $(-> $rtn:ty)? $code:block } => {
type $ty = extern $callingconv fn($($ident: $arg),*) $(-> $rtn)?;
extern $callingconv fn $ty($($ident: $arg),*) $(-> $rtn)? $code
};
{ @callingconv $ty:ident = extern $callingconv:tt fn($($ident:ident: $arg:ty),*) $(-> $rtn:ty)? } => {
type $ty = extern $callingconv fn($($ident: $arg),*) $(-> $rtn)?;
};
{ #[win32 = $win32:tt] #[win64 = $win64:tt] #[linux32 = $linux32:tt] #[linux64 = $linux64:tt] $ty:ident = extern fn($($ident:ident: $arg:ty),*) $(-> $rtn:ty)? $code:block } => {
#[cfg(all(target_os = "windows", target_pointer_width = "32"))]
$crate::__callingconv_func! { @callingconv $ty = extern $win32 fn($($ident: $arg),*) $(-> $rtn)? $code }
#[cfg(all(target_os = "windows", target_pointer_width = "64"))]
$crate::__callingconv_func! { @callingconv $ty = extern $win64 fn($($ident: $arg),*) $(-> $rtn)? $code }
#[cfg(all(target_os = "linux", target_pointer_width = "32"))]
$crate::__callingconv_func! { @callingconv $ty = extern $linux32 fn($($ident: $arg),*) $(-> $rtn)? $code }
#[cfg(all(target_os = "linux", target_pointer_width = "64"))]
$crate::__callingconv_func! { @callingconv $ty = extern $linux64 fn($($ident: $arg),*) $(-> $rtn)? $code }
};
{ #[win32 = $win32:tt] #[win64 = $win64:tt] #[linux32 = $linux32:tt] #[linux64 = $linux64:tt] $ty:ident = extern fn($($ident:ident: $arg:ty),*) $(-> $rtn:ty)? } => {
#[cfg(all(target_os = "windows", target_pointer_width = "32"))]
$crate::__callingconv_func! { @callingconv $ty = extern $win32 fn($($ident: $arg),*) $(-> $rtn)? }
#[cfg(all(target_os = "windows", target_pointer_width = "64"))]
$crate::__callingconv_func! { @callingconv $ty = extern $win64 fn($($ident: $arg),*) $(-> $rtn)? }
#[cfg(all(target_os = "linux", target_pointer_width = "32"))]
$crate::__callingconv_func! { @callingconv $ty = extern $linux32 fn($($ident: $arg),*) $(-> $rtn)? }
#[cfg(all(target_os = "linux", target_pointer_width = "64"))]
$crate::__callingconv_func! { @callingconv $ty = extern $linux64 fn($($ident: $arg),*) $(-> $rtn)? }
};
}
#[macro_export]
/// Common pattern for detouring.
macro_rules! __gmod_func {