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Rewrite implementation of #[alloc_error_handler]

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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).
This commit is contained in:
Amanieu d'Antras 2022-10-14 02:24:58 +01:00
parent 2afca78a0b
commit 56074b5231
40 changed files with 441 additions and 166 deletions
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8
compiler/rustc_passes/src/errors.rs
View file

@ -701,14 +701,6 @@ pub struct UnknownExternLangItem {
#[diag(passes_missing_panic_handler)]
pub struct MissingPanicHandler;
#[derive(Diagnostic)]
#[diag(passes_alloc_func_required)]
pub struct AllocFuncRequired;
#[derive(Diagnostic)]
#[diag(passes_missing_alloc_error_handler)]
pub struct MissingAllocErrorHandler;
#[derive(Diagnostic)]
#[diag(passes_missing_lang_item)]
#[note]