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Fix calling convention for CRT startup #81598

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Feb 1, 2021
Merged

Fix calling convention for CRT startup #81598

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22 changes: 10 additions & 12 deletions library/std/src/sys/windows/compat.rs
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Original file line number Diff line number Diff line change
Expand Up @@ -74,26 +74,24 @@ macro_rules! compat_fn {
/// used, and would remove it.
#[used]
#[link_section = ".CRT$XCU"]
static INIT_TABLE_ENTRY: fn() = init;
static INIT_TABLE_ENTRY: unsafe extern "C" fn() = init;

fn init() {
unsafe extern "C" fn init() {
// There is no locking here. This code is executed before main() is entered, and
// is guaranteed to be single-threaded.
//
// DO NOT do anything interesting or complicated in this function! DO NOT call
// any Rust functions or CRT functions, if those functions touch any global state,
// because this function runs during global initialization. For example, DO NOT
// do any dynamic allocation, don't call LoadLibrary, etc.
unsafe {
let module_name: *const u8 = concat!($module, "\0").as_ptr();
let symbol_name: *const u8 = concat!(stringify!($symbol), "\0").as_ptr();
let module_handle = $crate::sys::c::GetModuleHandleA(module_name as *const i8);
if !module_handle.is_null() {
match $crate::sys::c::GetProcAddress(module_handle, symbol_name as *const i8) as usize {
0 => {}
n => {
PTR = Some(mem::transmute::<usize, F>(n));
}
let module_name: *const u8 = concat!($module, "\0").as_ptr();
let symbol_name: *const u8 = concat!(stringify!($symbol), "\0").as_ptr();
let module_handle = $crate::sys::c::GetModuleHandleA(module_name as *const i8);
if !module_handle.is_null() {
match $crate::sys::c::GetProcAddress(module_handle, symbol_name as *const i8) as usize {
0 => {}
n => {
PTR = Some(mem::transmute::<usize, F>(n));
}
}
}
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