rust/tests/ui/feature-gates/feature-gate-alloc-error-handler.rs

// compile-flags:-C panic=abort

#![no_std]
#![no_main]

use core::alloc::Layout;

#[alloc_error_handler] //~ ERROR use of unstable library feature 'alloc_error_handler'
fn oom(info: Layout) -> ! {
    loop {}
}

#[panic_handler]
fn panic(_: &core::panic::PanicInfo) -> ! {
    loop {}
}
Implement #[alloc_error_handler] This to-be-stable attribute is equivalent to `#[lang = "oom"]`. It is required when using the alloc crate without the std crate. It is called by `handle_alloc_error`, which is in turned called by "infallible" allocations APIs such as `Vec::push`. 2018-07-06 13:49:52 +00:00			`// compile-flags:-C panic=abort`

			`#![no_std]`
			`#![no_main]`

			`use core::alloc::Layout;`

Rewrite implementation of `#[alloc_error_handler]` The new implementation doesn't use weak lang items and instead changes `#[alloc_error_handler]` to an attribute macro just like `#[global_allocator]`. The attribute will generate the `__rg_oom` function which is called by the compiler-generated `__rust_alloc_error_handler`. If no `__rg_oom` function is defined in any crate then the compiler shim will call `__rdl_oom` in the alloc crate which will simply panic. This also fixes link errors with `-C link-dead-code` with `default_alloc_error_handler`: `__rg_oom` was previously defined in the alloc crate and would attempt to reference the `oom` lang item, even if it didn't exist. This worked as long as `__rg_oom` was excluded from linking since it was not called. This is a prerequisite for the stabilization of `default_alloc_error_handler` (#102318). 2022-10-14 01:24:58 +00:00			`#[alloc_error_handler] //~ ERROR use of unstable library feature 'alloc_error_handler'`
Implement #[alloc_error_handler] This to-be-stable attribute is equivalent to `#[lang = "oom"]`. It is required when using the alloc crate without the std crate. It is called by `handle_alloc_error`, which is in turned called by "infallible" allocations APIs such as `Vec::push`. 2018-07-06 13:49:52 +00:00			`fn oom(info: Layout) -> ! {`
			`loop {}`
			`}`
Make sure feature gate errors are recoverable (take 2) 2019-01-02 14:14:24 +00:00
			`#[panic_handler]`
Rewrite implementation of `#[alloc_error_handler]` The new implementation doesn't use weak lang items and instead changes `#[alloc_error_handler]` to an attribute macro just like `#[global_allocator]`. The attribute will generate the `__rg_oom` function which is called by the compiler-generated `__rust_alloc_error_handler`. If no `__rg_oom` function is defined in any crate then the compiler shim will call `__rdl_oom` in the alloc crate which will simply panic. This also fixes link errors with `-C link-dead-code` with `default_alloc_error_handler`: `__rg_oom` was previously defined in the alloc crate and would attempt to reference the `oom` lang item, even if it didn't exist. This worked as long as `__rg_oom` was excluded from linking since it was not called. This is a prerequisite for the stabilization of `default_alloc_error_handler` (#102318). 2022-10-14 01:24:58 +00:00			`fn panic(_: &core::panic::PanicInfo) -> ! {`
			`loop {}`
			`}`