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rust/compiler/rustc_target/src/spec/mod.rs
Miguel Ojeda 0df8ddee53 Stack probes: fix error message 
Signed-off-by: Miguel Ojeda <ojeda@kernel.org>
2021-02-11 20:33:16 +01:00

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Rust
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//! [Flexible target specification.](https://github.com/rust-lang/rfcs/pull/131)
//!
//! Rust targets a wide variety of usecases, and in the interest of flexibility,
//! allows new target triples to be defined in configuration files. Most users
//! will not need to care about these, but this is invaluable when porting Rust
//! to a new platform, and allows for an unprecedented level of control over how
//! the compiler works.
//!
//! # Using custom targets
//!
//! A target triple, as passed via `rustc --target=TRIPLE`, will first be
//! compared against the list of built-in targets. This is to ease distributing
//! rustc (no need for configuration files) and also to hold these built-in
//! targets as immutable and sacred. If `TRIPLE` is not one of the built-in
//! targets, rustc will check if a file named `TRIPLE` exists. If it does, it
//! will be loaded as the target configuration. If the file does not exist,
//! rustc will search each directory in the environment variable
//! `RUST_TARGET_PATH` for a file named `TRIPLE.json`. The first one found will
//! be loaded. If no file is found in any of those directories, a fatal error
//! will be given.
//!
//! Projects defining their own targets should use
//! `--target=path/to/my-awesome-platform.json` instead of adding to
//! `RUST_TARGET_PATH`.
//!
//! # Defining a new target
//!
//! Targets are defined using [JSON](http://json.org/). The `Target` struct in
//! this module defines the format the JSON file should take, though each
//! underscore in the field names should be replaced with a hyphen (`-`) in the
//! JSON file. Some fields are required in every target specification, such as
//! `llvm-target`, `target-endian`, `target-pointer-width`, `data-layout`,
//! `arch`, and `os`. In general, options passed to rustc with `-C` override
//! the target's settings, though `target-feature` and `link-args` will *add*
//! to the list specified by the target, rather than replace.
use crate::abi::Endian;
use crate::spec::abi::{lookup as lookup_abi, Abi};
use crate::spec::crt_objects::{CrtObjects, CrtObjectsFallback};
use rustc_serialize::json::{Json, ToJson};
use rustc_span::symbol::{sym, Symbol};
use std::collections::BTreeMap;
use std::convert::TryFrom;
use std::ops::{Deref, DerefMut};
use std::path::{Path, PathBuf};
use std::str::FromStr;
use std::{fmt, io};
use rustc_macros::HashStable_Generic;
pub mod abi;
pub mod crt_objects;
mod android_base;
mod apple_base;
mod apple_sdk_base;
mod arm_base;
mod avr_gnu_base;
mod dragonfly_base;
mod freebsd_base;
mod fuchsia_base;
mod haiku_base;
mod hermit_base;
mod hermit_kernel_base;
mod illumos_base;
mod l4re_base;
mod linux_base;
mod linux_gnu_base;
mod linux_kernel_base;
mod linux_musl_base;
mod linux_uclibc_base;
mod msvc_base;
mod netbsd_base;
mod openbsd_base;
mod redox_base;
mod riscv_base;
mod solaris_base;
mod thumb_base;
mod uefi_msvc_base;
mod vxworks_base;
mod wasm32_base;
mod windows_gnu_base;
mod windows_msvc_base;
mod windows_uwp_gnu_base;
mod windows_uwp_msvc_base;
#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
pub enum LinkerFlavor {
Em,
Gcc,
Ld,
Msvc,
Lld(LldFlavor),
PtxLinker,
}
#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
pub enum LldFlavor {
Wasm,
Ld64,
Ld,
Link,
}
impl LldFlavor {
fn from_str(s: &str) -> Option<Self> {
Some(match s {
"darwin" => LldFlavor::Ld64,
"gnu" => LldFlavor::Ld,
"link" => LldFlavor::Link,
"wasm" => LldFlavor::Wasm,
_ => return None,
})
}
}
impl ToJson for LldFlavor {
fn to_json(&self) -> Json {
match *self {
LldFlavor::Ld64 => "darwin",
LldFlavor::Ld => "gnu",
LldFlavor::Link => "link",
LldFlavor::Wasm => "wasm",
}
.to_json()
}
}
impl ToJson for LinkerFlavor {
fn to_json(&self) -> Json {
self.desc().to_json()
}
}
macro_rules! flavor_mappings {
($((($($flavor:tt)*), $string:expr),)*) => (
impl LinkerFlavor {
pub const fn one_of() -> &'static str {
concat!("one of: ", $($string, " ",)*)
}
pub fn from_str(s: &str) -> Option<Self> {
Some(match s {
$($string => $($flavor)*,)*
_ => return None,
})
}
pub fn desc(&self) -> &str {
match *self {
$($($flavor)* => $string,)*
}
}
}
)
}
flavor_mappings! {
((LinkerFlavor::Em), "em"),
((LinkerFlavor::Gcc), "gcc"),
((LinkerFlavor::Ld), "ld"),
((LinkerFlavor::Msvc), "msvc"),
((LinkerFlavor::PtxLinker), "ptx-linker"),
((LinkerFlavor::Lld(LldFlavor::Wasm)), "wasm-ld"),
((LinkerFlavor::Lld(LldFlavor::Ld64)), "ld64.lld"),
((LinkerFlavor::Lld(LldFlavor::Ld)), "ld.lld"),
((LinkerFlavor::Lld(LldFlavor::Link)), "lld-link"),
}
#[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
pub enum PanicStrategy {
Unwind,
Abort,
}
impl PanicStrategy {
pub fn desc(&self) -> &str {
match *self {
PanicStrategy::Unwind => "unwind",
PanicStrategy::Abort => "abort",
}
}
pub fn desc_symbol(&self) -> Symbol {
match *self {
PanicStrategy::Unwind => sym::unwind,
PanicStrategy::Abort => sym::abort,
}
}
}
impl ToJson for PanicStrategy {
fn to_json(&self) -> Json {
match *self {
PanicStrategy::Abort => "abort".to_json(),
PanicStrategy::Unwind => "unwind".to_json(),
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable)]
pub enum RelroLevel {
Full,
Partial,
Off,
None,
}
impl RelroLevel {
pub fn desc(&self) -> &str {
match *self {
RelroLevel::Full => "full",
RelroLevel::Partial => "partial",
RelroLevel::Off => "off",
RelroLevel::None => "none",
}
}
}
impl FromStr for RelroLevel {
type Err = ();
fn from_str(s: &str) -> Result<RelroLevel, ()> {
match s {
"full" => Ok(RelroLevel::Full),
"partial" => Ok(RelroLevel::Partial),
"off" => Ok(RelroLevel::Off),
"none" => Ok(RelroLevel::None),
_ => Err(()),
}
}
}
impl ToJson for RelroLevel {
fn to_json(&self) -> Json {
match *self {
RelroLevel::Full => "full".to_json(),
RelroLevel::Partial => "partial".to_json(),
RelroLevel::Off => "off".to_json(),
RelroLevel::None => "None".to_json(),
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable)]
pub enum MergeFunctions {
Disabled,
Trampolines,
Aliases,
}
impl MergeFunctions {
pub fn desc(&self) -> &str {
match *self {
MergeFunctions::Disabled => "disabled",
MergeFunctions::Trampolines => "trampolines",
MergeFunctions::Aliases => "aliases",
}
}
}
impl FromStr for MergeFunctions {
type Err = ();
fn from_str(s: &str) -> Result<MergeFunctions, ()> {
match s {
"disabled" => Ok(MergeFunctions::Disabled),
"trampolines" => Ok(MergeFunctions::Trampolines),
"aliases" => Ok(MergeFunctions::Aliases),
_ => Err(()),
}
}
}
impl ToJson for MergeFunctions {
fn to_json(&self) -> Json {
match *self {
MergeFunctions::Disabled => "disabled".to_json(),
MergeFunctions::Trampolines => "trampolines".to_json(),
MergeFunctions::Aliases => "aliases".to_json(),
}
}
}
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum RelocModel {
Static,
Pic,
DynamicNoPic,
Ropi,
Rwpi,
RopiRwpi,
}
impl FromStr for RelocModel {
type Err = ();
fn from_str(s: &str) -> Result<RelocModel, ()> {
Ok(match s {
"static" => RelocModel::Static,
"pic" => RelocModel::Pic,
"dynamic-no-pic" => RelocModel::DynamicNoPic,
"ropi" => RelocModel::Ropi,
"rwpi" => RelocModel::Rwpi,
"ropi-rwpi" => RelocModel::RopiRwpi,
_ => return Err(()),
})
}
}
impl ToJson for RelocModel {
fn to_json(&self) -> Json {
match *self {
RelocModel::Static => "static",
RelocModel::Pic => "pic",
RelocModel::DynamicNoPic => "dynamic-no-pic",
RelocModel::Ropi => "ropi",
RelocModel::Rwpi => "rwpi",
RelocModel::RopiRwpi => "ropi-rwpi",
}
.to_json()
}
}
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum CodeModel {
Tiny,
Small,
Kernel,
Medium,
Large,
}
impl FromStr for CodeModel {
type Err = ();
fn from_str(s: &str) -> Result<CodeModel, ()> {
Ok(match s {
"tiny" => CodeModel::Tiny,
"small" => CodeModel::Small,
"kernel" => CodeModel::Kernel,
"medium" => CodeModel::Medium,
"large" => CodeModel::Large,
_ => return Err(()),
})
}
}
impl ToJson for CodeModel {
fn to_json(&self) -> Json {
match *self {
CodeModel::Tiny => "tiny",
CodeModel::Small => "small",
CodeModel::Kernel => "kernel",
CodeModel::Medium => "medium",
CodeModel::Large => "large",
}
.to_json()
}
}
#[derive(Clone, Copy, PartialEq, Hash, Debug)]
pub enum TlsModel {
GeneralDynamic,
LocalDynamic,
InitialExec,
LocalExec,
}
impl FromStr for TlsModel {
type Err = ();
fn from_str(s: &str) -> Result<TlsModel, ()> {
Ok(match s {
// Note the difference "general" vs "global" difference. The model name is "general",
// but the user-facing option name is "global" for consistency with other compilers.
"global-dynamic" => TlsModel::GeneralDynamic,
"local-dynamic" => TlsModel::LocalDynamic,
"initial-exec" => TlsModel::InitialExec,
"local-exec" => TlsModel::LocalExec,
_ => return Err(()),
})
}
}
impl ToJson for TlsModel {
fn to_json(&self) -> Json {
match *self {
TlsModel::GeneralDynamic => "global-dynamic",
TlsModel::LocalDynamic => "local-dynamic",
TlsModel::InitialExec => "initial-exec",
TlsModel::LocalExec => "local-exec",
}
.to_json()
}
}
/// Everything is flattened to a single enum to make the json encoding/decoding less annoying.
#[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
pub enum LinkOutputKind {
/// Dynamically linked non position-independent executable.
DynamicNoPicExe,
/// Dynamically linked position-independent executable.
DynamicPicExe,
/// Statically linked non position-independent executable.
StaticNoPicExe,
/// Statically linked position-independent executable.
StaticPicExe,
/// Regular dynamic library ("dynamically linked").
DynamicDylib,
/// Dynamic library with bundled libc ("statically linked").
StaticDylib,
/// WASI module with a lifetime past the _initialize entry point
WasiReactorExe,
}
impl LinkOutputKind {
fn as_str(&self) -> &'static str {
match self {
LinkOutputKind::DynamicNoPicExe => "dynamic-nopic-exe",
LinkOutputKind::DynamicPicExe => "dynamic-pic-exe",
LinkOutputKind::StaticNoPicExe => "static-nopic-exe",
LinkOutputKind::StaticPicExe => "static-pic-exe",
LinkOutputKind::DynamicDylib => "dynamic-dylib",
LinkOutputKind::StaticDylib => "static-dylib",
LinkOutputKind::WasiReactorExe => "wasi-reactor-exe",
}
}
pub(super) fn from_str(s: &str) -> Option<LinkOutputKind> {
Some(match s {
"dynamic-nopic-exe" => LinkOutputKind::DynamicNoPicExe,
"dynamic-pic-exe" => LinkOutputKind::DynamicPicExe,
"static-nopic-exe" => LinkOutputKind::StaticNoPicExe,
"static-pic-exe" => LinkOutputKind::StaticPicExe,
"dynamic-dylib" => LinkOutputKind::DynamicDylib,
"static-dylib" => LinkOutputKind::StaticDylib,
"wasi-reactor-exe" => LinkOutputKind::WasiReactorExe,
_ => return None,
})
}
}
impl fmt::Display for LinkOutputKind {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(self.as_str())
}
}
pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<String>>;
#[derive(Clone, Copy, Hash, Debug, PartialEq, Eq)]
pub enum SplitDebuginfo {
/// Split debug-information is disabled, meaning that on supported platforms
/// you can find all debug information in the executable itself. This is
/// only supported for ELF effectively.
///
/// * Windows - not supported
/// * macOS - don't run `dsymutil`
/// * ELF - `.dwarf_*` sections
Off,
/// Split debug-information can be found in a "packed" location separate
/// from the final artifact. This is supported on all platforms.
///
/// * Windows - `*.pdb`
/// * macOS - `*.dSYM` (run `dsymutil`)
/// * ELF - `*.dwp` (run `rust-llvm-dwp`)
Packed,
/// Split debug-information can be found in individual object files on the
/// filesystem. The main executable may point to the object files.
///
/// * Windows - not supported
/// * macOS - supported, scattered object files
/// * ELF - supported, scattered `*.dwo` files
Unpacked,
}
impl SplitDebuginfo {
fn as_str(&self) -> &'static str {
match self {
SplitDebuginfo::Off => "off",
SplitDebuginfo::Packed => "packed",
SplitDebuginfo::Unpacked => "unpacked",
}
}
}
impl FromStr for SplitDebuginfo {
type Err = ();
fn from_str(s: &str) -> Result<SplitDebuginfo, ()> {
Ok(match s {
"off" => SplitDebuginfo::Off,
"unpacked" => SplitDebuginfo::Unpacked,
"packed" => SplitDebuginfo::Packed,
_ => return Err(()),
})
}
}
impl ToJson for SplitDebuginfo {
fn to_json(&self) -> Json {
self.as_str().to_json()
}
}
impl fmt::Display for SplitDebuginfo {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
f.write_str(self.as_str())
}
}
macro_rules! supported_targets {
( $(($( $triple:literal, )+ $module:ident ),)+ ) => {
$(mod $module;)+
/// List of supported targets
pub const TARGETS: &[&str] = &[$($($triple),+),+];
fn load_builtin(target: &str) -> Option<Target> {
let mut t = match target {
$( $($triple)|+ => $module::target(), )+
_ => return None,
};
t.is_builtin = true;
debug!("got builtin target: {:?}", t);
Some(t)
}
#[cfg(test)]
mod tests {
mod tests_impl;
// Cannot put this into a separate file without duplication, make an exception.
$(
#[test] // `#[test]`
fn $module() {
tests_impl::test_target(super::$module::target());
}
)+
}
};
}
#[derive(Clone, Debug, PartialEq, Eq)]
pub enum StackProbeType {
/// Don't emit any stack probes.
None,
/// It is harmless to use this option even on targets that do not have backend support for
/// stack probes as the failure mode is the same as if no stack-probe option was specified in
/// the first place.
Inline,
/// Call `__rust_probestack` whenever stack needs to be probed.
Call,
/// Use inline option for LLVM versions later than specified in `min_llvm_version_for_inline`
/// and call `__rust_probestack` otherwise.
InlineOrCall { min_llvm_version_for_inline: (u32, u32, u32) },
}
impl StackProbeType {
fn from_json(json: &Json) -> Result<Self, String> {
let object = json.as_object().ok_or_else(|| "expected a JSON object")?;
let kind = object
.get("kind")
.and_then(|o| o.as_string())
.ok_or_else(|| "expected `kind` to be a string")?;
match kind {
"none" => Ok(StackProbeType::None),
"inline" => Ok(StackProbeType::Inline),
"call" => Ok(StackProbeType::Call),
"inline-or-call" => {
let min_version = object
.get("min-llvm-version-for-inline")
.and_then(|o| o.as_array())
.ok_or_else(|| "expected `min-llvm-version-for-inline` to be an array")?;
let mut iter = min_version.into_iter().map(|v| {
let int = v.as_u64().ok_or_else(
|| "expected `min-llvm-version-for-inline` values to be integers",
)?;
u32::try_from(int)
.map_err(|_| "`min-llvm-version-for-inline` values don't convert to u32")
});
let min_llvm_version_for_inline = (
iter.next().unwrap_or(Ok(11))?,
iter.next().unwrap_or(Ok(0))?,
iter.next().unwrap_or(Ok(0))?,
);
Ok(StackProbeType::InlineOrCall { min_llvm_version_for_inline })
}
_ => Err(String::from(
"`kind` expected to be one of `none`, `inline`, `call` or `inline-or-call`",
)),
}
}
}
impl ToJson for StackProbeType {
fn to_json(&self) -> Json {
Json::Object(match self {
StackProbeType::None => {
vec![(String::from("kind"), "none".to_json())].into_iter().collect()
}
StackProbeType::Inline => {
vec![(String::from("kind"), "inline".to_json())].into_iter().collect()
}
StackProbeType::Call => {
vec![(String::from("kind"), "call".to_json())].into_iter().collect()
}
StackProbeType::InlineOrCall { min_llvm_version_for_inline } => vec![
(String::from("kind"), "inline-or-call".to_json()),
(
String::from("min-llvm-version-for-inline"),
min_llvm_version_for_inline.to_json(),
),
]
.into_iter()
.collect(),
})
}
}
supported_targets! {
("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
("mipsisa32r6-unknown-linux-gnu", mipsisa32r6_unknown_linux_gnu),
("mipsisa32r6el-unknown-linux-gnu", mipsisa32r6el_unknown_linux_gnu),
("mipsisa64r6-unknown-linux-gnuabi64", mipsisa64r6_unknown_linux_gnuabi64),
("mipsisa64r6el-unknown-linux-gnuabi64", mipsisa64r6el_unknown_linux_gnuabi64),
("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
("armv5te-unknown-linux-uclibceabi", armv5te_unknown_linux_uclibceabi),
("armv7-unknown-linux-gnueabi", armv7_unknown_linux_gnueabi),
("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
("thumbv7neon-unknown-linux-musleabihf", thumbv7neon_unknown_linux_musleabihf),
("armv7-unknown-linux-musleabi", armv7_unknown_linux_musleabi),
("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
("i686-unknown-linux-musl", i686_unknown_linux_musl),
("i586-unknown-linux-musl", i586_unknown_linux_musl),
("mips-unknown-linux-musl", mips_unknown_linux_musl),
("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
("mips64-unknown-linux-muslabi64", mips64_unknown_linux_muslabi64),
("mips64el-unknown-linux-muslabi64", mips64el_unknown_linux_muslabi64),
("hexagon-unknown-linux-musl", hexagon_unknown_linux_musl),
("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
("i686-linux-android", i686_linux_android),
("x86_64-linux-android", x86_64_linux_android),
("arm-linux-androideabi", arm_linux_androideabi),
("armv7-linux-androideabi", armv7_linux_androideabi),
("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
("aarch64-linux-android", aarch64_linux_android),
("x86_64-linux-kernel", x86_64_linux_kernel),
("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
("armv6-unknown-freebsd", armv6_unknown_freebsd),
("armv7-unknown-freebsd", armv7_unknown_freebsd),
("i686-unknown-freebsd", i686_unknown_freebsd),
("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
("i686-unknown-openbsd", i686_unknown_openbsd),
("sparc64-unknown-openbsd", sparc64_unknown_openbsd),
("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
("i686-unknown-netbsd", i686_unknown_netbsd),
("powerpc-unknown-netbsd", powerpc_unknown_netbsd),
("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
("x86_64-rumprun-netbsd", x86_64_rumprun_netbsd),
("i686-unknown-haiku", i686_unknown_haiku),
("x86_64-unknown-haiku", x86_64_unknown_haiku),
("aarch64-apple-darwin", aarch64_apple_darwin),
("x86_64-apple-darwin", x86_64_apple_darwin),
("i686-apple-darwin", i686_apple_darwin),
("aarch64-fuchsia", aarch64_fuchsia),
("x86_64-fuchsia", x86_64_fuchsia),
("avr-unknown-gnu-atmega328", avr_unknown_gnu_atmega328),
("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
("aarch64-unknown-redox", aarch64_unknown_redox),
("x86_64-unknown-redox", x86_64_unknown_redox),
("i386-apple-ios", i386_apple_ios),
("x86_64-apple-ios", x86_64_apple_ios),
("aarch64-apple-ios", aarch64_apple_ios),
("armv7-apple-ios", armv7_apple_ios),
("armv7s-apple-ios", armv7s_apple_ios),
("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
("aarch64-apple-ios-macabi", aarch64_apple_ios_macabi),
("aarch64-apple-tvos", aarch64_apple_tvos),
("x86_64-apple-tvos", x86_64_apple_tvos),
("armebv7r-none-eabi", armebv7r_none_eabi),
("armebv7r-none-eabihf", armebv7r_none_eabihf),
("armv7r-none-eabi", armv7r_none_eabi),
("armv7r-none-eabihf", armv7r_none_eabihf),
// `x86_64-pc-solaris` is an alias for `x86_64_sun_solaris` for backwards compatibility reasons.
// (See <https://github.com/rust-lang/rust/issues/40531>.)
("x86_64-sun-solaris", "x86_64-pc-solaris", x86_64_sun_solaris),
("sparcv9-sun-solaris", sparcv9_sun_solaris),
("x86_64-unknown-illumos", x86_64_unknown_illumos),
("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
("i686-pc-windows-gnu", i686_pc_windows_gnu),
("i686-uwp-windows-gnu", i686_uwp_windows_gnu),
("x86_64-uwp-windows-gnu", x86_64_uwp_windows_gnu),
("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
("aarch64-uwp-windows-msvc", aarch64_uwp_windows_msvc),
("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
("x86_64-uwp-windows-msvc", x86_64_uwp_windows_msvc),
("i686-pc-windows-msvc", i686_pc_windows_msvc),
("i686-uwp-windows-msvc", i686_uwp_windows_msvc),
("i586-pc-windows-msvc", i586_pc_windows_msvc),
("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
("thumbv7a-uwp-windows-msvc", thumbv7a_uwp_windows_msvc),
("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
("wasm32-unknown-unknown", wasm32_unknown_unknown),
("wasm32-wasi", wasm32_wasi),
("thumbv6m-none-eabi", thumbv6m_none_eabi),
("thumbv7m-none-eabi", thumbv7m_none_eabi),
("thumbv7em-none-eabi", thumbv7em_none_eabi),
("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
("armv7a-none-eabi", armv7a_none_eabi),
("armv7a-none-eabihf", armv7a_none_eabihf),
("msp430-none-elf", msp430_none_elf),
("aarch64-unknown-hermit", aarch64_unknown_hermit),
("x86_64-unknown-hermit", x86_64_unknown_hermit),
("x86_64-unknown-hermit-kernel", x86_64_unknown_hermit_kernel),
("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
("riscv32gc-unknown-linux-gnu", riscv32gc_unknown_linux_gnu),
("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),
("aarch64-unknown-none", aarch64_unknown_none),
("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat),
("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
("x86_64-unknown-uefi", x86_64_unknown_uefi),
("i686-unknown-uefi", i686_unknown_uefi),
("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
("i686-wrs-vxworks", i686_wrs_vxworks),
("x86_64-wrs-vxworks", x86_64_wrs_vxworks),
("armv7-wrs-vxworks-eabihf", armv7_wrs_vxworks_eabihf),
("aarch64-wrs-vxworks", aarch64_wrs_vxworks),
("powerpc-wrs-vxworks", powerpc_wrs_vxworks),
("powerpc-wrs-vxworks-spe", powerpc_wrs_vxworks_spe),
("powerpc64-wrs-vxworks", powerpc64_wrs_vxworks),
("mipsel-sony-psp", mipsel_sony_psp),
("mipsel-unknown-none", mipsel_unknown_none),
("thumbv4t-none-eabi", thumbv4t_none_eabi),
("aarch64_be-unknown-linux-gnu", aarch64_be_unknown_linux_gnu),
("aarch64-unknown-linux-gnu_ilp32", aarch64_unknown_linux_gnu_ilp32),
("aarch64_be-unknown-linux-gnu_ilp32", aarch64_be_unknown_linux_gnu_ilp32),
}
/// Everything `rustc` knows about how to compile for a specific target.
///
/// Every field here must be specified, and has no default value.
#[derive(PartialEq, Clone, Debug)]
pub struct Target {
/// Target triple to pass to LLVM.
pub llvm_target: String,
/// Number of bits in a pointer. Influences the `target_pointer_width` `cfg` variable.
pub pointer_width: u32,
/// Architecture to use for ABI considerations. Valid options include: "x86",
/// "x86_64", "arm", "aarch64", "mips", "powerpc", "powerpc64", and others.
pub arch: String,
/// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
pub data_layout: String,
/// Optional settings with defaults.
pub options: TargetOptions,
}
pub trait HasTargetSpec {
fn target_spec(&self) -> &Target;
}
impl HasTargetSpec for Target {
fn target_spec(&self) -> &Target {
self
}
}
/// Optional aspects of a target specification.
///
/// This has an implementation of `Default`, see each field for what the default is. In general,
/// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
///
/// `TargetOptions` as a separate structure is mostly an implementation detail of `Target`
/// construction, all its fields logically belong to `Target` and available from `Target`
/// through `Deref` impls.
#[derive(PartialEq, Clone, Debug)]
pub struct TargetOptions {
/// Whether the target is built-in or loaded from a custom target specification.
pub is_builtin: bool,
/// Used as the `target_endian` `cfg` variable. Defaults to little endian.
pub endian: Endian,
/// Width of c_int type. Defaults to "32".
pub c_int_width: String,
/// OS name to use for conditional compilation (`target_os`). Defaults to "none".
/// "none" implies a bare metal target without `std` library.
/// A couple of targets having `std` also use "unknown" as an `os` value,
/// but they are exceptions.
pub os: String,
/// Environment name to use for conditional compilation (`target_env`). Defaults to "".
pub env: String,
/// Vendor name to use for conditional compilation (`target_vendor`). Defaults to "unknown".
pub vendor: String,
/// Default linker flavor used if `-C linker-flavor` or `-C linker` are not passed
/// on the command line. Defaults to `LinkerFlavor::Gcc`.
pub linker_flavor: LinkerFlavor,
/// Linker to invoke
pub linker: Option<String>,
/// LLD flavor used if `lld` (or `rust-lld`) is specified as a linker
/// without clarifying its flavor in any way.
pub lld_flavor: LldFlavor,
/// Linker arguments that are passed *before* any user-defined libraries.
pub pre_link_args: LinkArgs,
/// Objects to link before and after all other object code.
pub pre_link_objects: CrtObjects,
pub post_link_objects: CrtObjects,
/// Same as `(pre|post)_link_objects`, but when we fail to pull the objects with help of the
/// target's native gcc and fall back to the "self-contained" mode and pull them manually.
/// See `crt_objects.rs` for some more detailed documentation.
pub pre_link_objects_fallback: CrtObjects,
pub post_link_objects_fallback: CrtObjects,
/// Which logic to use to determine whether to fall back to the "self-contained" mode or not.
pub crt_objects_fallback: Option<CrtObjectsFallback>,
/// Linker arguments that are unconditionally passed after any
/// user-defined but before post-link objects. Standard platform
/// libraries that should be always be linked to, usually go here.
pub late_link_args: LinkArgs,
/// Linker arguments used in addition to `late_link_args` if at least one
/// Rust dependency is dynamically linked.
pub late_link_args_dynamic: LinkArgs,
/// Linker arguments used in addition to `late_link_args` if aall Rust
/// dependencies are statically linked.
pub late_link_args_static: LinkArgs,
/// Linker arguments that are unconditionally passed *after* any
/// user-defined libraries.
pub post_link_args: LinkArgs,
/// Optional link script applied to `dylib` and `executable` crate types.
/// This is a string containing the script, not a path. Can only be applied
/// to linkers where `linker_is_gnu` is true.
pub link_script: Option<String>,
/// Environment variables to be set for the linker invocation.
pub link_env: Vec<(String, String)>,
/// Environment variables to be removed for the linker invocation.
pub link_env_remove: Vec<String>,
/// Extra arguments to pass to the external assembler (when used)
pub asm_args: Vec<String>,
/// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
/// to "generic".
pub cpu: String,
/// Default target features to pass to LLVM. These features will *always* be
/// passed, and cannot be disabled even via `-C`. Corresponds to `llc
/// -mattr=$features`.
pub features: String,
/// Whether dynamic linking is available on this target. Defaults to false.
pub dynamic_linking: bool,
/// If dynamic linking is available, whether only cdylibs are supported.
pub only_cdylib: bool,
/// Whether executables are available on this target. iOS, for example, only allows static
/// libraries. Defaults to false.
pub executables: bool,
/// Relocation model to use in object file. Corresponds to `llc
/// -relocation-model=$relocation_model`. Defaults to `Pic`.
pub relocation_model: RelocModel,
/// Code model to use. Corresponds to `llc -code-model=$code_model`.
/// Defaults to `None` which means "inherited from the base LLVM target".
pub code_model: Option<CodeModel>,
/// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
/// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
pub tls_model: TlsModel,
/// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
pub disable_redzone: bool,
/// Eliminate frame pointers from stack frames if possible. Defaults to true.
pub eliminate_frame_pointer: bool,
/// Emit each function in its own section. Defaults to true.
pub function_sections: bool,
/// String to prepend to the name of every dynamic library. Defaults to "lib".
pub dll_prefix: String,
/// String to append to the name of every dynamic library. Defaults to ".so".
pub dll_suffix: String,
/// String to append to the name of every executable.
pub exe_suffix: String,
/// String to prepend to the name of every static library. Defaults to "lib".
pub staticlib_prefix: String,
/// String to append to the name of every static library. Defaults to ".a".
pub staticlib_suffix: String,
/// OS family to use for conditional compilation. Valid options: "unix", "windows".
pub os_family: Option<String>,
/// Whether the target toolchain's ABI supports returning small structs as an integer.
pub abi_return_struct_as_int: bool,
/// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
/// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
pub is_like_osx: bool,
/// Whether the target toolchain is like Solaris's.
/// Only useful for compiling against Illumos/Solaris,
/// as they have a different set of linker flags. Defaults to false.
pub is_like_solaris: bool,
/// Whether the target is like Windows.
/// This is a combination of several more specific properties represented as a single flag:
/// - The target uses a Windows ABI,
/// - uses PE/COFF as a format for object code,
/// - uses Windows-style dllexport/dllimport for shared libraries,
/// - uses import libraries and .def files for symbol exports,
/// - executables support setting a subsystem.
pub is_like_windows: bool,
/// Whether the target is like MSVC.
/// This is a combination of several more specific properties represented as a single flag:
/// - The target has all the properties from `is_like_windows`
/// (for in-tree targets "is_like_msvc ⇒ is_like_windows" is ensured by a unit test),
/// - has some MSVC-specific Windows ABI properties,
/// - uses a link.exe-like linker,
/// - uses CodeView/PDB for debuginfo and natvis for its visualization,
/// - uses SEH-based unwinding,
/// - supports control flow guard mechanism.
pub is_like_msvc: bool,
/// Whether the target toolchain is like Emscripten's. Only useful for compiling with
/// Emscripten toolchain.
/// Defaults to false.
pub is_like_emscripten: bool,
/// Whether the target toolchain is like Fuchsia's.
pub is_like_fuchsia: bool,
/// Version of DWARF to use if not using the default.
/// Useful because some platforms (osx, bsd) only want up to DWARF2.
pub dwarf_version: Option<u32>,
/// Whether the linker support GNU-like arguments such as -O. Defaults to false.
pub linker_is_gnu: bool,
/// The MinGW toolchain has a known issue that prevents it from correctly
/// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
/// symbol needs its own COMDAT section, weak linkage implies a large
/// number sections that easily exceeds the given limit for larger
/// codebases. Consequently we want a way to disallow weak linkage on some
/// platforms.
pub allows_weak_linkage: bool,
/// Whether the linker support rpaths or not. Defaults to false.
pub has_rpath: bool,
/// Whether to disable linking to the default libraries, typically corresponds
/// to `-nodefaultlibs`. Defaults to true.
pub no_default_libraries: bool,
/// Dynamically linked executables can be compiled as position independent
/// if the default relocation model of position independent code is not
/// changed. This is a requirement to take advantage of ASLR, as otherwise
/// the functions in the executable are not randomized and can be used
/// during an exploit of a vulnerability in any code.
pub position_independent_executables: bool,
/// Executables that are both statically linked and position-independent are supported.
pub static_position_independent_executables: bool,
/// Determines if the target always requires using the PLT for indirect
/// library calls or not. This controls the default value of the `-Z plt` flag.
pub needs_plt: bool,
/// Either partial, full, or off. Full RELRO makes the dynamic linker
/// resolve all symbols at startup and marks the GOT read-only before
/// starting the program, preventing overwriting the GOT.
pub relro_level: RelroLevel,
/// Format that archives should be emitted in. This affects whether we use
/// LLVM to assemble an archive or fall back to the system linker, and
/// currently only "gnu" is used to fall into LLVM. Unknown strings cause
/// the system linker to be used.
pub archive_format: String,
/// Is asm!() allowed? Defaults to true.
pub allow_asm: bool,
/// Whether the runtime startup code requires the `main` function be passed
/// `argc` and `argv` values.
pub main_needs_argc_argv: bool,
/// Flag indicating whether ELF TLS (e.g., #[thread_local]) is available for
/// this target.
pub has_elf_tls: bool,
// This is mainly for easy compatibility with emscripten.
// If we give emcc .o files that are actually .bc files it
// will 'just work'.
pub obj_is_bitcode: bool,
/// Whether the target requires that emitted object code includes bitcode.
pub forces_embed_bitcode: bool,
/// Content of the LLVM cmdline section associated with embedded bitcode.
pub bitcode_llvm_cmdline: String,
/// Don't use this field; instead use the `.min_atomic_width()` method.
pub min_atomic_width: Option<u64>,
/// Don't use this field; instead use the `.max_atomic_width()` method.
pub max_atomic_width: Option<u64>,
/// Whether the target supports atomic CAS operations natively
pub atomic_cas: bool,
/// Panic strategy: "unwind" or "abort"
pub panic_strategy: PanicStrategy,
/// A list of ABIs unsupported by the current target. Note that generic ABIs
/// are considered to be supported on all platforms and cannot be marked
/// unsupported.
pub unsupported_abis: Vec<Abi>,
/// Whether or not linking dylibs to a static CRT is allowed.
pub crt_static_allows_dylibs: bool,
/// Whether or not the CRT is statically linked by default.
pub crt_static_default: bool,
/// Whether or not crt-static is respected by the compiler (or is a no-op).
pub crt_static_respected: bool,
/// The implementation of stack probes to use.
pub stack_probes: StackProbeType,
/// The minimum alignment for global symbols.
pub min_global_align: Option<u64>,
/// Default number of codegen units to use in debug mode
pub default_codegen_units: Option<u64>,
/// Whether to generate trap instructions in places where optimization would
/// otherwise produce control flow that falls through into unrelated memory.
pub trap_unreachable: bool,
/// This target requires everything to be compiled with LTO to emit a final
/// executable, aka there is no native linker for this target.
pub requires_lto: bool,
/// This target has no support for threads.
pub singlethread: bool,
/// Whether library functions call lowering/optimization is disabled in LLVM
/// for this target unconditionally.
pub no_builtins: bool,
/// The default visibility for symbols in this target should be "hidden"
/// rather than "default"
pub default_hidden_visibility: bool,
/// Whether a .debug_gdb_scripts section will be added to the output object file
pub emit_debug_gdb_scripts: bool,
/// Whether or not to unconditionally `uwtable` attributes on functions,
/// typically because the platform needs to unwind for things like stack
/// unwinders.
pub requires_uwtable: bool,
/// Whether or not SIMD types are passed by reference in the Rust ABI,
/// typically required if a target can be compiled with a mixed set of
/// target features. This is `true` by default, and `false` for targets like
/// wasm32 where the whole program either has simd or not.
pub simd_types_indirect: bool,
/// Pass a list of symbol which should be exported in the dylib to the linker.
pub limit_rdylib_exports: bool,
/// If set, have the linker export exactly these symbols, instead of using
/// the usual logic to figure this out from the crate itself.
pub override_export_symbols: Option<Vec<String>>,
/// Determines how or whether the MergeFunctions LLVM pass should run for
/// this target. Either "disabled", "trampolines", or "aliases".
/// The MergeFunctions pass is generally useful, but some targets may need
/// to opt out. The default is "aliases".
///
/// Workaround for: <https://github.com/rust-lang/rust/issues/57356>
pub merge_functions: MergeFunctions,
/// Use platform dependent mcount function
pub mcount: String,
/// LLVM ABI name, corresponds to the '-mabi' parameter available in multilib C compilers
pub llvm_abiname: String,
/// Whether or not RelaxElfRelocation flag will be passed to the linker
pub relax_elf_relocations: bool,
/// Additional arguments to pass to LLVM, similar to the `-C llvm-args` codegen option.
pub llvm_args: Vec<String>,
/// Whether to use legacy .ctors initialization hooks rather than .init_array. Defaults
/// to false (uses .init_array).
pub use_ctors_section: bool,
/// Whether the linker is instructed to add a `GNU_EH_FRAME` ELF header
/// used to locate unwinding information is passed
/// (only has effect if the linker is `ld`-like).
pub eh_frame_header: bool,
/// Is true if the target is an ARM architecture using thumb v1 which allows for
/// thumb and arm interworking.
pub has_thumb_interworking: bool,
/// How to handle split debug information, if at all. Specifying `None` has
/// target-specific meaning.
pub split_debuginfo: SplitDebuginfo,
}
impl Default for TargetOptions {
/// Creates a set of "sane defaults" for any target. This is still
/// incomplete, and if used for compilation, will certainly not work.
fn default() -> TargetOptions {
TargetOptions {
is_builtin: false,
endian: Endian::Little,
c_int_width: "32".to_string(),
os: "none".to_string(),
env: String::new(),
vendor: "unknown".to_string(),
linker_flavor: LinkerFlavor::Gcc,
linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.to_string()),
lld_flavor: LldFlavor::Ld,
pre_link_args: LinkArgs::new(),
post_link_args: LinkArgs::new(),
link_script: None,
asm_args: Vec::new(),
cpu: "generic".to_string(),
features: String::new(),
dynamic_linking: false,
only_cdylib: false,
executables: false,
relocation_model: RelocModel::Pic,
code_model: None,
tls_model: TlsModel::GeneralDynamic,
disable_redzone: false,
eliminate_frame_pointer: true,
function_sections: true,
dll_prefix: "lib".to_string(),
dll_suffix: ".so".to_string(),
exe_suffix: String::new(),
staticlib_prefix: "lib".to_string(),
staticlib_suffix: ".a".to_string(),
os_family: None,
abi_return_struct_as_int: false,
is_like_osx: false,
is_like_solaris: false,
is_like_windows: false,
is_like_emscripten: false,
is_like_msvc: false,
is_like_fuchsia: false,
dwarf_version: None,
linker_is_gnu: false,
allows_weak_linkage: true,
has_rpath: false,
no_default_libraries: true,
position_independent_executables: false,
static_position_independent_executables: false,
needs_plt: false,
relro_level: RelroLevel::None,
pre_link_objects: Default::default(),
post_link_objects: Default::default(),
pre_link_objects_fallback: Default::default(),
post_link_objects_fallback: Default::default(),
crt_objects_fallback: None,
late_link_args: LinkArgs::new(),
late_link_args_dynamic: LinkArgs::new(),
late_link_args_static: LinkArgs::new(),
link_env: Vec::new(),
link_env_remove: Vec::new(),
archive_format: "gnu".to_string(),
main_needs_argc_argv: true,
allow_asm: true,
has_elf_tls: false,
obj_is_bitcode: false,
forces_embed_bitcode: false,
bitcode_llvm_cmdline: String::new(),
min_atomic_width: None,
max_atomic_width: None,
atomic_cas: true,
panic_strategy: PanicStrategy::Unwind,
unsupported_abis: vec![],
crt_static_allows_dylibs: false,
crt_static_default: false,
crt_static_respected: false,
stack_probes: StackProbeType::None,
min_global_align: None,
default_codegen_units: None,
trap_unreachable: true,
requires_lto: false,
singlethread: false,
no_builtins: false,
default_hidden_visibility: false,
emit_debug_gdb_scripts: true,
requires_uwtable: false,
simd_types_indirect: true,
limit_rdylib_exports: true,
override_export_symbols: None,
merge_functions: MergeFunctions::Aliases,
mcount: "mcount".to_string(),
llvm_abiname: "".to_string(),
relax_elf_relocations: false,
llvm_args: vec![],
use_ctors_section: false,
eh_frame_header: true,
has_thumb_interworking: false,
split_debuginfo: SplitDebuginfo::Off,
}
}
}
/// `TargetOptions` being a separate type is basically an implementation detail of `Target` that is
/// used for providing defaults. Perhaps there's a way to merge `TargetOptions` into `Target` so
/// this `Deref` implementation is no longer necessary.
impl Deref for Target {
type Target = TargetOptions;
fn deref(&self) -> &Self::Target {
&self.options
}
}
impl DerefMut for Target {
fn deref_mut(&mut self) -> &mut Self::Target {
&mut self.options
}
}
impl Target {
/// Given a function ABI, turn it into the correct ABI for this target.
pub fn adjust_abi(&self, abi: Abi) -> Abi {
match abi {
Abi::System => {
if self.is_like_windows && self.arch == "x86" {
Abi::Stdcall
} else {
Abi::C
}
}
// These ABI kinds are ignored on non-x86 Windows targets.
// See https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
// and the individual pages for __stdcall et al.
Abi::Stdcall | Abi::Fastcall | Abi::Vectorcall | Abi::Thiscall => {
if self.is_like_windows && self.arch != "x86" { Abi::C } else { abi }
}
Abi::EfiApi => {
if self.arch == "x86_64" {
Abi::Win64
} else {
Abi::C
}
}
abi => abi,
}
}
/// Minimum integer size in bits that this target can perform atomic
/// operations on.
pub fn min_atomic_width(&self) -> u64 {
self.min_atomic_width.unwrap_or(8)
}
/// Maximum integer size in bits that this target can perform atomic
/// operations on.
pub fn max_atomic_width(&self) -> u64 {
self.max_atomic_width.unwrap_or_else(|| self.pointer_width.into())
}
pub fn is_abi_supported(&self, abi: Abi) -> bool {
abi.generic() || !self.unsupported_abis.contains(&abi)
}
/// Loads a target descriptor from a JSON object.
pub fn from_json(obj: Json) -> Result<Target, String> {
// While ugly, this code must remain this way to retain
// compatibility with existing JSON fields and the internal
// expected naming of the Target and TargetOptions structs.
// To ensure compatibility is retained, the built-in targets
// are round-tripped through this code to catch cases where
// the JSON parser is not updated to match the structs.
let get_req_field = |name: &str| {
obj.find(name)
.map(|s| s.as_string())
.and_then(|os| os.map(|s| s.to_string()))
.ok_or_else(|| format!("Field {} in target specification is required", name))
};
let mut base = Target {
llvm_target: get_req_field("llvm-target")?,
pointer_width: get_req_field("target-pointer-width")?
.parse::<u32>()
.map_err(|_| "target-pointer-width must be an integer".to_string())?,
data_layout: get_req_field("data-layout")?,
arch: get_req_field("arch")?,
options: Default::default(),
};
macro_rules! key {
($key_name:ident) => ( {
let name = (stringify!($key_name)).replace("_", "-");
if let Some(s) = obj.find(&name).and_then(Json::as_string) {
base.$key_name = s.to_string();
}
} );
($key_name:ident = $json_name:expr) => ( {
let name = $json_name;
if let Some(s) = obj.find(&name).and_then(Json::as_string) {
base.$key_name = s.to_string();
}
} );
($key_name:ident, bool) => ( {
let name = (stringify!($key_name)).replace("_", "-");
if let Some(s) = obj.find(&name).and_then(Json::as_boolean) {
base.$key_name = s;
}
} );
($key_name:ident, Option<u32>) => ( {
let name = (stringify!($key_name)).replace("_", "-");
if let Some(s) = obj.find(&name).and_then(Json::as_u64) {
if s < 1 || s > 5 {
return Err("Not a valid DWARF version number".to_string());
}
base.$key_name = Some(s as u32);
}
} );
($key_name:ident, Option<u64>) => ( {
let name = (stringify!($key_name)).replace("_", "-");
if let Some(s) = obj.find(&name).and_then(Json::as_u64) {
base.$key_name = Some(s);
}
} );
($key_name:ident, MergeFunctions) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s.parse::<MergeFunctions>() {
Ok(mergefunc) => base.$key_name = mergefunc,
_ => return Some(Err(format!("'{}' is not a valid value for \
merge-functions. Use 'disabled', \
'trampolines', or 'aliases'.",
s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, RelocModel) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s.parse::<RelocModel>() {
Ok(relocation_model) => base.$key_name = relocation_model,
_ => return Some(Err(format!("'{}' is not a valid relocation model. \
Run `rustc --print relocation-models` to \
see the list of supported values.", s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, CodeModel) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s.parse::<CodeModel>() {
Ok(code_model) => base.$key_name = Some(code_model),
_ => return Some(Err(format!("'{}' is not a valid code model. \
Run `rustc --print code-models` to \
see the list of supported values.", s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, TlsModel) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s.parse::<TlsModel>() {
Ok(tls_model) => base.$key_name = tls_model,
_ => return Some(Err(format!("'{}' is not a valid TLS model. \
Run `rustc --print tls-models` to \
see the list of supported values.", s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, PanicStrategy) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s {
"unwind" => base.$key_name = PanicStrategy::Unwind,
"abort" => base.$key_name = PanicStrategy::Abort,
_ => return Some(Err(format!("'{}' is not a valid value for \
panic-strategy. Use 'unwind' or 'abort'.",
s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, RelroLevel) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s.parse::<RelroLevel>() {
Ok(level) => base.$key_name = level,
_ => return Some(Err(format!("'{}' is not a valid value for \
relro-level. Use 'full', 'partial, or 'off'.",
s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, SplitDebuginfo) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s.parse::<SplitDebuginfo>() {
Ok(level) => base.$key_name = level,
_ => return Some(Err(format!("'{}' is not a valid value for \
split-debuginfo. Use 'off' or 'dsymutil'.",
s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, list) => ( {
let name = (stringify!($key_name)).replace("_", "-");
if let Some(v) = obj.find(&name).and_then(Json::as_array) {
base.$key_name = v.iter()
.map(|a| a.as_string().unwrap().to_string())
.collect();
}
} );
($key_name:ident, opt_list) => ( {
let name = (stringify!($key_name)).replace("_", "-");
if let Some(v) = obj.find(&name).and_then(Json::as_array) {
base.$key_name = Some(v.iter()
.map(|a| a.as_string().unwrap().to_string())
.collect());
}
} );
($key_name:ident, optional) => ( {
let name = (stringify!($key_name)).replace("_", "-");
if let Some(o) = obj.find(&name[..]) {
base.$key_name = o
.as_string()
.map(|s| s.to_string() );
}
} );
($key_name:ident = $json_name:expr, optional) => ( {
let name = $json_name;
if let Some(o) = obj.find(&name[..]) {
base.$key_name = o
.as_string()
.map(|s| s.to_string() );
}
} );
($key_name:ident, LldFlavor) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
if let Some(flavor) = LldFlavor::from_str(&s) {
base.$key_name = flavor;
} else {
return Some(Err(format!(
"'{}' is not a valid value for lld-flavor. \
Use 'darwin', 'gnu', 'link' or 'wasm.",
s)))
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, LinkerFlavor) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match LinkerFlavor::from_str(s) {
Some(linker_flavor) => base.$key_name = linker_flavor,
_ => return Some(Err(format!("'{}' is not a valid value for linker-flavor. \
Use {}", s, LinkerFlavor::one_of()))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, StackProbeType) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| match StackProbeType::from_json(o) {
Ok(v) => {
base.$key_name = v;
Some(Ok(()))
},
Err(s) => Some(Err(
format!("`{:?}` is not a valid value for `{}`: {}", o, name, s)
)),
}).unwrap_or(Ok(()))
} );
($key_name:ident, crt_objects_fallback) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s.parse::<CrtObjectsFallback>() {
Ok(fallback) => base.$key_name = Some(fallback),
_ => return Some(Err(format!("'{}' is not a valid CRT objects fallback. \
Use 'musl', 'mingw' or 'wasm'", s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, link_objects) => ( {
let name = (stringify!($key_name)).replace("_", "-");
if let Some(val) = obj.find(&name[..]) {
let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
JSON object with fields per CRT object kind.", name))?;
let mut args = CrtObjects::new();
for (k, v) in obj {
let kind = LinkOutputKind::from_str(&k).ok_or_else(|| {
format!("{}: '{}' is not a valid value for CRT object kind. \
Use '(dynamic,static)-(nopic,pic)-exe' or \
'(dynamic,static)-dylib' or 'wasi-reactor-exe'", name, k)
})?;
let v = v.as_array().ok_or_else(||
format!("{}.{}: expected a JSON array", name, k)
)?.iter().enumerate()
.map(|(i,s)| {
let s = s.as_string().ok_or_else(||
format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
Ok(s.to_owned())
})
.collect::<Result<Vec<_>, String>>()?;
args.insert(kind, v);
}
base.$key_name = args;
}
} );
($key_name:ident, link_args) => ( {
let name = (stringify!($key_name)).replace("_", "-");
if let Some(val) = obj.find(&name[..]) {
let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
JSON object with fields per linker-flavor.", name))?;
let mut args = LinkArgs::new();
for (k, v) in obj {
let flavor = LinkerFlavor::from_str(&k).ok_or_else(|| {
format!("{}: '{}' is not a valid value for linker-flavor. \
Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
})?;
let v = v.as_array().ok_or_else(||
format!("{}.{}: expected a JSON array", name, k)
)?.iter().enumerate()
.map(|(i,s)| {
let s = s.as_string().ok_or_else(||
format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
Ok(s.to_owned())
})
.collect::<Result<Vec<_>, String>>()?;
args.insert(flavor, v);
}
base.$key_name = args;
}
} );
($key_name:ident, env) => ( {
let name = (stringify!($key_name)).replace("_", "-");
if let Some(a) = obj.find(&name[..]).and_then(|o| o.as_array()) {
for o in a {
if let Some(s) = o.as_string() {
let p = s.split('=').collect::<Vec<_>>();
if p.len() == 2 {
let k = p[0].to_string();
let v = p[1].to_string();
base.$key_name.push((k, v));
}
}
}
}
} );
}
if let Some(s) = obj.find("target-endian").and_then(Json::as_string) {
base.endian = s.parse()?;
}
key!(is_builtin, bool);
key!(c_int_width = "target-c-int-width");
key!(os);
key!(env);
key!(vendor);
key!(linker_flavor, LinkerFlavor)?;
key!(linker, optional);
key!(lld_flavor, LldFlavor)?;
key!(pre_link_objects, link_objects);
key!(post_link_objects, link_objects);
key!(pre_link_objects_fallback, link_objects);
key!(post_link_objects_fallback, link_objects);
key!(crt_objects_fallback, crt_objects_fallback)?;
key!(pre_link_args, link_args);
key!(late_link_args, link_args);
key!(late_link_args_dynamic, link_args);
key!(late_link_args_static, link_args);
key!(post_link_args, link_args);
key!(link_script, optional);
key!(link_env, env);
key!(link_env_remove, list);
key!(asm_args, list);
key!(cpu);
key!(features);
key!(dynamic_linking, bool);
key!(only_cdylib, bool);
key!(executables, bool);
key!(relocation_model, RelocModel)?;
key!(code_model, CodeModel)?;
key!(tls_model, TlsModel)?;
key!(disable_redzone, bool);
key!(eliminate_frame_pointer, bool);
key!(function_sections, bool);
key!(dll_prefix);
key!(dll_suffix);
key!(exe_suffix);
key!(staticlib_prefix);
key!(staticlib_suffix);
key!(os_family = "target-family", optional);
key!(abi_return_struct_as_int, bool);
key!(is_like_osx, bool);
key!(is_like_solaris, bool);
key!(is_like_windows, bool);
key!(is_like_msvc, bool);
key!(is_like_emscripten, bool);
key!(is_like_fuchsia, bool);
key!(dwarf_version, Option<u32>);
key!(linker_is_gnu, bool);
key!(allows_weak_linkage, bool);
key!(has_rpath, bool);
key!(no_default_libraries, bool);
key!(position_independent_executables, bool);
key!(static_position_independent_executables, bool);
key!(needs_plt, bool);
key!(relro_level, RelroLevel)?;
key!(archive_format);
key!(allow_asm, bool);
key!(main_needs_argc_argv, bool);
key!(has_elf_tls, bool);
key!(obj_is_bitcode, bool);
key!(forces_embed_bitcode, bool);
key!(bitcode_llvm_cmdline);
key!(max_atomic_width, Option<u64>);
key!(min_atomic_width, Option<u64>);
key!(atomic_cas, bool);
key!(panic_strategy, PanicStrategy)?;
key!(crt_static_allows_dylibs, bool);
key!(crt_static_default, bool);
key!(crt_static_respected, bool);
key!(stack_probes, StackProbeType)?;
key!(min_global_align, Option<u64>);
key!(default_codegen_units, Option<u64>);
key!(trap_unreachable, bool);
key!(requires_lto, bool);
key!(singlethread, bool);
key!(no_builtins, bool);
key!(default_hidden_visibility, bool);
key!(emit_debug_gdb_scripts, bool);
key!(requires_uwtable, bool);
key!(simd_types_indirect, bool);
key!(limit_rdylib_exports, bool);
key!(override_export_symbols, opt_list);
key!(merge_functions, MergeFunctions)?;
key!(mcount = "target-mcount");
key!(llvm_abiname);
key!(relax_elf_relocations, bool);
key!(llvm_args, list);
key!(use_ctors_section, bool);
key!(eh_frame_header, bool);
key!(has_thumb_interworking, bool);
key!(split_debuginfo, SplitDebuginfo)?;
// NB: The old name is deprecated, but support for it is retained for
// compatibility.
for name in ["abi-blacklist", "unsupported-abis"].iter() {
if let Some(array) = obj.find(name).and_then(Json::as_array) {
for name in array.iter().filter_map(|abi| abi.as_string()) {
match lookup_abi(name) {
Some(abi) => {
if abi.generic() {
return Err(format!(
"The ABI \"{}\" is considered to be supported on all \
targets and cannot be marked unsupported",
abi
));
}
base.unsupported_abis.push(abi)
}
None => {
return Err(format!(
"Unknown ABI \"{}\" in target specification",
name
));
}
}
}
}
}
Ok(base)
}
/// Search RUST_TARGET_PATH for a JSON file specifying the given target
/// triple. Note that it could also just be a bare filename already, so also
/// check for that. If one of the hardcoded targets we know about, just
/// return it directly.
///
/// The error string could come from any of the APIs called, including
/// filesystem access and JSON decoding.
pub fn search(target_triple: &TargetTriple) -> Result<Target, String> {
use rustc_serialize::json;
use std::env;
use std::fs;
fn load_file(path: &Path) -> Result<Target, String> {
let contents = fs::read(path).map_err(|e| e.to_string())?;
let obj = json::from_reader(&mut &contents[..]).map_err(|e| e.to_string())?;
Target::from_json(obj)
}
match *target_triple {
TargetTriple::TargetTriple(ref target_triple) => {
// check if triple is in list of built-in targets
if let Some(t) = load_builtin(target_triple) {
return Ok(t);
}
// search for a file named `target_triple`.json in RUST_TARGET_PATH
let path = {
let mut target = target_triple.to_string();
target.push_str(".json");
PathBuf::from(target)
};
let target_path = env::var_os("RUST_TARGET_PATH").unwrap_or_default();
// FIXME 16351: add a sane default search path?
for dir in env::split_paths(&target_path) {
let p = dir.join(&path);
if p.is_file() {
return load_file(&p);
}
}
Err(format!("Could not find specification for target {:?}", target_triple))
}
TargetTriple::TargetPath(ref target_path) => {
if target_path.is_file() {
return load_file(&target_path);
}
Err(format!("Target path {:?} is not a valid file", target_path))
}
}
}
}
impl ToJson for Target {
fn to_json(&self) -> Json {
let mut d = BTreeMap::new();
let default: TargetOptions = Default::default();
macro_rules! target_val {
($attr:ident) => {{
let name = (stringify!($attr)).replace("_", "-");
d.insert(name, self.$attr.to_json());
}};
($attr:ident, $key_name:expr) => {{
let name = $key_name;
d.insert(name.to_string(), self.$attr.to_json());
}};
}
macro_rules! target_option_val {
($attr:ident) => {{
let name = (stringify!($attr)).replace("_", "-");
if default.$attr != self.$attr {
d.insert(name, self.$attr.to_json());
}
}};
($attr:ident, $key_name:expr) => {{
let name = $key_name;
if default.$attr != self.$attr {
d.insert(name.to_string(), self.$attr.to_json());
}
}};
(link_args - $attr:ident) => {{
let name = (stringify!($attr)).replace("_", "-");
if default.$attr != self.$attr {
let obj = self
.$attr
.iter()
.map(|(k, v)| (k.desc().to_owned(), v.clone()))
.collect::<BTreeMap<_, _>>();
d.insert(name, obj.to_json());
}
}};
(env - $attr:ident) => {{
let name = (stringify!($attr)).replace("_", "-");
if default.$attr != self.$attr {
let obj = self
.$attr
.iter()
.map(|&(ref k, ref v)| k.clone() + "=" + &v)
.collect::<Vec<_>>();
d.insert(name, obj.to_json());
}
}};
}
target_val!(llvm_target);
d.insert("target-pointer-width".to_string(), self.pointer_width.to_string().to_json());
target_val!(arch);
target_val!(data_layout);
target_option_val!(is_builtin);
target_option_val!(endian, "target-endian");
target_option_val!(c_int_width, "target-c-int-width");
target_option_val!(os);
target_option_val!(env);
target_option_val!(vendor);
target_option_val!(linker_flavor);
target_option_val!(linker);
target_option_val!(lld_flavor);
target_option_val!(pre_link_objects);
target_option_val!(post_link_objects);
target_option_val!(pre_link_objects_fallback);
target_option_val!(post_link_objects_fallback);
target_option_val!(crt_objects_fallback);
target_option_val!(link_args - pre_link_args);
target_option_val!(link_args - late_link_args);
target_option_val!(link_args - late_link_args_dynamic);
target_option_val!(link_args - late_link_args_static);
target_option_val!(link_args - post_link_args);
target_option_val!(link_script);
target_option_val!(env - link_env);
target_option_val!(link_env_remove);
target_option_val!(asm_args);
target_option_val!(cpu);
target_option_val!(features);
target_option_val!(dynamic_linking);
target_option_val!(only_cdylib);
target_option_val!(executables);
target_option_val!(relocation_model);
target_option_val!(code_model);
target_option_val!(tls_model);
target_option_val!(disable_redzone);
target_option_val!(eliminate_frame_pointer);
target_option_val!(function_sections);
target_option_val!(dll_prefix);
target_option_val!(dll_suffix);
target_option_val!(exe_suffix);
target_option_val!(staticlib_prefix);
target_option_val!(staticlib_suffix);
target_option_val!(os_family, "target-family");
target_option_val!(abi_return_struct_as_int);
target_option_val!(is_like_osx);
target_option_val!(is_like_solaris);
target_option_val!(is_like_windows);
target_option_val!(is_like_msvc);
target_option_val!(is_like_emscripten);
target_option_val!(is_like_fuchsia);
target_option_val!(dwarf_version);
target_option_val!(linker_is_gnu);
target_option_val!(allows_weak_linkage);
target_option_val!(has_rpath);
target_option_val!(no_default_libraries);
target_option_val!(position_independent_executables);
target_option_val!(static_position_independent_executables);
target_option_val!(needs_plt);
target_option_val!(relro_level);
target_option_val!(archive_format);
target_option_val!(allow_asm);
target_option_val!(main_needs_argc_argv);
target_option_val!(has_elf_tls);
target_option_val!(obj_is_bitcode);
target_option_val!(forces_embed_bitcode);
target_option_val!(bitcode_llvm_cmdline);
target_option_val!(min_atomic_width);
target_option_val!(max_atomic_width);
target_option_val!(atomic_cas);
target_option_val!(panic_strategy);
target_option_val!(crt_static_allows_dylibs);
target_option_val!(crt_static_default);
target_option_val!(crt_static_respected);
target_option_val!(stack_probes);
target_option_val!(min_global_align);
target_option_val!(default_codegen_units);
target_option_val!(trap_unreachable);
target_option_val!(requires_lto);
target_option_val!(singlethread);
target_option_val!(no_builtins);
target_option_val!(default_hidden_visibility);
target_option_val!(emit_debug_gdb_scripts);
target_option_val!(requires_uwtable);
target_option_val!(simd_types_indirect);
target_option_val!(limit_rdylib_exports);
target_option_val!(override_export_symbols);
target_option_val!(merge_functions);
target_option_val!(mcount, "target-mcount");
target_option_val!(llvm_abiname);
target_option_val!(relax_elf_relocations);
target_option_val!(llvm_args);
target_option_val!(use_ctors_section);
target_option_val!(eh_frame_header);
target_option_val!(has_thumb_interworking);
target_option_val!(split_debuginfo);
if default.unsupported_abis != self.unsupported_abis {
d.insert(
"unsupported-abis".to_string(),
self.unsupported_abis
.iter()
.map(|&name| Abi::name(name).to_json())
.collect::<Vec<_>>()
.to_json(),
);
}
Json::Object(d)
}
}
/// Either a target triple string or a path to a JSON file.
#[derive(PartialEq, Clone, Debug, Hash, Encodable, Decodable)]
pub enum TargetTriple {
TargetTriple(String),
TargetPath(PathBuf),
}
impl TargetTriple {
/// Creates a target triple from the passed target triple string.
pub fn from_triple(triple: &str) -> Self {
TargetTriple::TargetTriple(triple.to_string())
}
/// Creates a target triple from the passed target path.
pub fn from_path(path: &Path) -> Result<Self, io::Error> {
let canonicalized_path = path.canonicalize()?;
Ok(TargetTriple::TargetPath(canonicalized_path))
}
/// Creates a target triple from its alias
pub fn from_alias(triple: String) -> Self {
macro_rules! target_aliases {
( $(($alias:literal, $target:literal ),)+ ) => {
match triple.as_str() {
$( $alias => TargetTriple::from_triple($target), )+
_ => TargetTriple::TargetTriple(triple),
}
}
}
target_aliases! {
// `x86_64-pc-solaris` is an alias for `x86_64_sun_solaris` for backwards compatibility reasons.
// (See <https://github.com/rust-lang/rust/issues/40531>.)
("x86_64-pc-solaris", "x86_64-sun-solaris"),
}
}
/// Returns a string triple for this target.
///
/// If this target is a path, the file name (without extension) is returned.
pub fn triple(&self) -> &str {
match *self {
TargetTriple::TargetTriple(ref triple) => triple,
TargetTriple::TargetPath(ref path) => path
.file_stem()
.expect("target path must not be empty")
.to_str()
.expect("target path must be valid unicode"),
}
}
/// Returns an extended string triple for this target.
///
/// If this target is a path, a hash of the path is appended to the triple returned
/// by `triple()`.
pub fn debug_triple(&self) -> String {
use std::collections::hash_map::DefaultHasher;
use std::hash::{Hash, Hasher};
let triple = self.triple();
if let TargetTriple::TargetPath(ref path) = *self {
let mut hasher = DefaultHasher::new();
path.hash(&mut hasher);
let hash = hasher.finish();
format!("{}-{}", triple, hash)
} else {
triple.to_owned()
}
}
}
impl fmt::Display for TargetTriple {
fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
write!(f, "{}", self.debug_triple())
}
}
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