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Auto merge of rust-lang#102503 - cuviper:x86-stack-probes, r=nagisa
Enable inline stack probes on X86 with LLVM 16 The known problems with x86 inline-asm stack probes have been solved on LLVM main (16), so this flips the switch. Anyone using bleeding-edge LLVM with rustc can start testing this, as I have done locally. We'll get more direct rust-ci when LLVM 16 branches and we start our upgrade, and we can always patch or disable it then if we find new problems. The previous attempt was rust-lang#77885, reverted in rust-lang#84708.
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Original file line number | Diff line number | Diff line change |
---|---|---|
@@ -0,0 +1,42 @@ | ||
// min-llvm-version: 16 | ||
// revisions: x86_64 i686 | ||
// assembly-output: emit-asm | ||
//[x86_64] compile-flags: --target x86_64-unknown-linux-gnu | ||
//[x86_64] needs-llvm-components: x86 | ||
//[i686] compile-flags: --target i686-unknown-linux-gnu | ||
//[i686] needs-llvm-components: x86 | ||
// compile-flags: -C llvm-args=-x86-asm-syntax=intel | ||
|
||
#![feature(no_core, lang_items)] | ||
#![crate_type = "lib"] | ||
#![no_core] | ||
|
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#[lang = "sized"] | ||
trait Sized {} | ||
#[lang = "copy"] | ||
trait Copy {} | ||
|
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impl Copy for u8 {} | ||
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// Check that inline-asm stack probes are generated correctly. | ||
// To avoid making this test fragile to slight asm changes, | ||
// we only check that the stack pointer is decremented by a page at a time, | ||
// instead of matching the whole probe sequence. | ||
|
||
// CHECK-LABEL: small_stack_probe: | ||
#[no_mangle] | ||
pub fn small_stack_probe(x: u8, f: fn(&mut [u8; 8192])) { | ||
// CHECK-NOT: __rust_probestack | ||
// x86_64: sub rsp, 4096 | ||
// i686: sub esp, 4096 | ||
f(&mut [x; 8192]); | ||
} | ||
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||
// CHECK-LABEL: big_stack_probe: | ||
#[no_mangle] | ||
pub fn big_stack_probe(x: u8, f: fn(&[u8; 65536])) { | ||
// CHECK-NOT: __rust_probestack | ||
// x86_64: sub rsp, 4096 | ||
// i686: sub esp, 4096 | ||
f(&mut [x; 65536]); | ||
} |
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