--- /dev/null
+//! [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 `inline-or-none`, `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())
+ }
+}
projects / rustc.git / blobdiff