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Merged
merged 1 commit into from
Oct 3, 2022
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Enable inline stack probes on X86 with LLVM 16 #102503

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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/i386_apple_ios.rs
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Expand Up @@ -14,8 +14,7 @@ pub fn target() -> Target {
arch: "x86".into(),
options: TargetOptions {
max_atomic_width: Some(64),
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
stack_probes: StackProbeType::Call,
stack_probes: StackProbeType::X86,
..base
},
}
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/i686_apple_darwin.rs
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Expand Up @@ -7,8 +7,7 @@ pub fn target() -> Target {
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m32"]);
base.link_env_remove.to_mut().extend(super::apple_base::macos_link_env_remove());
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
base.frame_pointer = FramePointer::Always;

// Clang automatically chooses a more specific target based on
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/i686_linux_android.rs
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Expand Up @@ -11,8 +11,7 @@ pub fn target() -> Target {
// https://developer.android.com/ndk/guides/abis.html#x86
base.cpu = "pentiumpro".into();
base.features = "+mmx,+sse,+sse2,+sse3,+ssse3".into();
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "i686-linux-android".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/i686_unknown_freebsd.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "pentium4".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m32", "-Wl,-znotext"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "i686-unknown-freebsd".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/i686_unknown_haiku.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "pentium4".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m32"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "i686-unknown-haiku".into(),
Expand Down
3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/i686_unknown_linux_gnu.rs
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Expand Up @@ -6,8 +6,7 @@ pub fn target() -> Target {
base.max_atomic_width = Some(64);
base.supported_sanitizers = SanitizerSet::ADDRESS;
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m32"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "i686-unknown-linux-gnu".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/i686_unknown_linux_musl.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "pentium4".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m32", "-Wl,-melf_i386"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

// The unwinder used by i686-unknown-linux-musl, the LLVM libunwind
// implementation, apparently relies on frame pointers existing... somehow.
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/i686_unknown_netbsd.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "pentium4".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m32"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "i686-unknown-netbsdelf".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/i686_unknown_openbsd.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "pentium4".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m32", "-fuse-ld=lld"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "i686-unknown-openbsd".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/i686_wrs_vxworks.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "pentium4".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m32"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "i686-unknown-linux-gnu".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/linux_kernel_base.rs
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Expand Up @@ -6,8 +6,7 @@ pub fn opts() -> TargetOptions {
env: "gnu".into(),
disable_redzone: true,
panic_strategy: PanicStrategy::Abort,
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
stack_probes: StackProbeType::Call,
stack_probes: StackProbeType::X86,
frame_pointer: FramePointer::Always,
position_independent_executables: true,
needs_plt: true,
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4 changes: 4 additions & 0 deletions compiler/rustc_target/src/spec/mod.rs
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Expand Up @@ -635,6 +635,10 @@ pub enum StackProbeType {
}

impl StackProbeType {
// LLVM X86 targets (ix86 and x86_64) can use inline-asm stack probes starting with LLVM 16.
// Notable past issues were rust#83139 (fixed in 14) and rust#84667 (fixed in 16).
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This is the reference I made to known issues, which were also mentioned in the distributed comments that I removed.

const X86: Self = Self::InlineOrCall { min_llvm_version_for_inline: (16, 0, 0) };

fn from_json(json: &Json) -> Result<Self, String> {
let object = json.as_object().ok_or_else(|| "expected a JSON object")?;
let kind = object
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_apple_darwin.rs
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Expand Up @@ -9,8 +9,7 @@ pub fn target() -> Target {
base.frame_pointer = FramePointer::Always;
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
base.link_env_remove.to_mut().extend(super::apple_base::macos_link_env_remove());
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
base.supported_sanitizers =
SanitizerSet::ADDRESS | SanitizerSet::CFI | SanitizerSet::LEAK | SanitizerSet::THREAD;

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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_apple_ios.rs
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Expand Up @@ -13,8 +13,7 @@ pub fn target() -> Target {
arch: "x86_64".into(),
options: TargetOptions {
max_atomic_width: Some(64),
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
stack_probes: StackProbeType::Call,
stack_probes: StackProbeType::X86,
..base
},
}
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_apple_ios_macabi.rs
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Expand Up @@ -15,8 +15,7 @@ pub fn target() -> Target {
arch: "x86_64".into(),
options: TargetOptions {
max_atomic_width: Some(64),
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
stack_probes: StackProbeType::Call,
stack_probes: StackProbeType::X86,
..base
},
}
Expand Down
3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_apple_tvos.rs
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Expand Up @@ -10,8 +10,7 @@ pub fn target() -> Target {
arch: "x86_64".into(),
options: TargetOptions {
max_atomic_width: Some(64),
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
stack_probes: StackProbeType::Call,
stack_probes: StackProbeType::X86,
..base
},
}
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_apple_watchos_sim.rs
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Expand Up @@ -15,8 +15,7 @@ pub fn target() -> Target {
arch: "x86_64".into(),
options: TargetOptions {
max_atomic_width: Some(64),
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
stack_probes: StackProbeType::Call,
stack_probes: StackProbeType::X86,
forces_embed_bitcode: true,
// Taken from a clang build on Xcode 11.4.1.
// These arguments are not actually invoked - they just have
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_fuchsia.rs
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Expand Up @@ -4,8 +4,7 @@ pub fn target() -> Target {
let mut base = super::fuchsia_base::opts();
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI;

Target {
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_linux_android.rs
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Expand Up @@ -7,8 +7,7 @@ pub fn target() -> Target {
base.features = "+mmx,+sse,+sse2,+sse3,+ssse3,+sse4.1,+sse4.2,+popcnt".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "x86_64-linux-android".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_pc_solaris.rs
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Expand Up @@ -6,8 +6,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.vendor = "pc".into();
base.max_atomic_width = Some(64);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
base.supported_sanitizers = SanitizerSet::ADDRESS | SanitizerSet::CFI;

Target {
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_sun_solaris.rs
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Expand Up @@ -6,8 +6,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.vendor = "sun".into();
base.max_atomic_width = Some(64);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "x86_64-pc-solaris".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_dragonfly.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "x86_64-unknown-dragonfly".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_freebsd.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
base.supported_sanitizers =
SanitizerSet::ADDRESS | SanitizerSet::CFI | SanitizerSet::MEMORY | SanitizerSet::THREAD;

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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_haiku.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
// This option is required to build executables on Haiku x86_64
base.position_independent_executables = true;

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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_hermit.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
base.features = "+rdrnd,+rdseed".into();
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "x86_64-unknown-hermit".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_linux_gnu.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
base.static_position_independent_executables = true;
base.supported_sanitizers = SanitizerSet::ADDRESS
| SanitizerSet::CFI
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_linux_gnux32.rs
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Expand Up @@ -6,8 +6,7 @@ pub fn target() -> Target {
base.abi = "x32".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-mx32"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
base.has_thread_local = false;
// BUG(GabrielMajeri): disabling the PLT on x86_64 Linux with x32 ABI
// breaks code gen. See LLVM bug 36743
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_linux_musl.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
base.static_position_independent_executables = true;
base.supported_sanitizers = SanitizerSet::ADDRESS
| SanitizerSet::CFI
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_netbsd.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
base.supported_sanitizers = SanitizerSet::ADDRESS
| SanitizerSet::CFI
| SanitizerSet::LEAK
Expand Down
3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_none.rs
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Expand Up @@ -11,8 +11,7 @@ pub fn target() -> Target {
let opts = TargetOptions {
cpu: "x86-64".into(),
max_atomic_width: Some(64),
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
stack_probes: StackProbeType::Call,
stack_probes: StackProbeType::X86,
position_independent_executables: true,
static_position_independent_executables: true,
relro_level: RelroLevel::Full,
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_openbsd.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "x86_64-unknown-openbsd".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_unknown_redox.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;

Target {
llvm_target: "x86_64-unknown-redox".into(),
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3 changes: 1 addition & 2 deletions compiler/rustc_target/src/spec/x86_64_wrs_vxworks.rs
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Expand Up @@ -5,8 +5,7 @@ pub fn target() -> Target {
base.cpu = "x86-64".into();
base.max_atomic_width = Some(64);
base.add_pre_link_args(LinkerFlavor::Gcc, &["-m64"]);
// don't use probe-stack=inline-asm until rust#83139 and rust#84667 are resolved
base.stack_probes = StackProbeType::Call;
base.stack_probes = StackProbeType::X86;
base.disable_redzone = true;

Target {
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42 changes: 42 additions & 0 deletions src/test/assembly/x86-stack-probes.rs
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@@ -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]

#[lang = "sized"]
trait Sized {}
#[lang = "copy"]
trait Copy {}

impl Copy for u8 {}

// 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]);
}

// 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]);
}
2 changes: 2 additions & 0 deletions src/test/codegen/stack-probes-call.rs
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Expand Up @@ -5,8 +5,10 @@
// revisions: i686 x86_64
//[i686] compile-flags: --target i686-unknown-linux-gnu
//[i686] needs-llvm-components: x86
//[i686] ignore-llvm-version: 16 - 99
//[x86_64] compile-flags: --target x86_64-unknown-linux-gnu
//[x86_64] needs-llvm-components: x86
//[x86_64] ignore-llvm-version: 16 - 99

#![crate_type = "rlib"]
#![feature(no_core, lang_items)]
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