mirror of
https://github.com/rust-lang/rust.git
synced 2026-05-01 15:50:05 +03:00
Matthias Krüger
3d3f817ff9
Stabilize `asm_goto` feature gate Stabilize `asm_goto` feature (tracked by #119364). The issue will remain open and be updated to track `asm_goto_with_outputs`. Reference PR: https://github.com/rust-lang/reference/pull/1693 # Stabilization Report This feature adds a `label <block>` operand type to `asm!`. `<block>` must be a block expression with type unit or never. The address of the block is substituted and the assembly may jump to the block. When block completes the `asm!` block returns and continues execution. The block starts a new safety context and unsafe operations within must have additional `unsafe`s; the effect of `unsafe` that surrounds `asm!` block is cancelled. See https://github.com/rust-lang/rust/issues/119364#issuecomment-2316037703 and https://github.com/rust-lang/rust/pull/131544. It's currently forbidden to use `asm_goto` with output operands; that is still unstable under `asm_goto_with_outputs`. Example: ```rust unsafe { asm!( "jmp {}", label { println!("Jumped from asm!"); } ); } ``` Tests: - tests/ui/asm/x86_64/goto.rs - tests/ui/asm/x86_64/goto-block-safe.stderr - tests/ui/asm/x86_64/bad-options.rs - tests/codegen/asm/goto.rs