1 //! [Flexible target specification.](https://github.com/rust-lang/rfcs/pull/131)
3 //! Rust targets a wide variety of usecases, and in the interest of flexibility,
4 //! allows new target triples to be defined in configuration files. Most users
5 //! will not need to care about these, but this is invaluable when porting Rust
6 //! to a new platform, and allows for an unprecedented level of control over how
7 //! the compiler works.
9 //! # Using custom targets
11 //! A target triple, as passed via `rustc --target=TRIPLE`, will first be
12 //! compared against the list of built-in targets. This is to ease distributing
13 //! rustc (no need for configuration files) and also to hold these built-in
14 //! targets as immutable and sacred. If `TRIPLE` is not one of the built-in
15 //! targets, rustc will check if a file named `TRIPLE` exists. If it does, it
16 //! will be loaded as the target configuration. If the file does not exist,
17 //! rustc will search each directory in the environment variable
18 //! `RUST_TARGET_PATH` for a file named `TRIPLE.json`. The first one found will
19 //! be loaded. If no file is found in any of those directories, a fatal error
22 //! Projects defining their own targets should use
23 //! `--target=path/to/my-awesome-platform.json` instead of adding to
24 //! `RUST_TARGET_PATH`.
26 //! # Defining a new target
28 //! Targets are defined using [JSON](https://json.org/). The `Target` struct in
29 //! this module defines the format the JSON file should take, though each
30 //! underscore in the field names should be replaced with a hyphen (`-`) in the
31 //! JSON file. Some fields are required in every target specification, such as
32 //! `llvm-target`, `target-endian`, `target-pointer-width`, `data-layout`,
33 //! `arch`, and `os`. In general, options passed to rustc with `-C` override
34 //! the target's settings, though `target-feature` and `link-args` will *add*
35 //! to the list specified by the target, rather than replace.
37 use crate::abi::Endian;
38 use crate::json::{Json, ToJson};
39 use crate::spec::abi::{lookup as lookup_abi, Abi};
40 use crate::spec::crt_objects::{CrtObjects, LinkSelfContainedDefault};
41 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
42 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
43 use rustc_span::symbol::{sym, Symbol};
44 use serde_json::Value;
46 use std::collections::BTreeMap;
47 use std::convert::TryFrom;
48 use std::hash::{Hash, Hasher};
49 use std::iter::FromIterator;
50 use std::ops::{Deref, DerefMut};
51 use std::path::{Path, PathBuf};
52 use std::str::FromStr;
55 use rustc_macros::HashStable_Generic;
74 mod linux_kernel_base;
76 mod linux_uclibc_base;
88 mod windows_gnullvm_base;
89 mod windows_msvc_base;
90 mod windows_uwp_gnu_base;
91 mod windows_uwp_msvc_base;
93 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
94 pub enum LinkerFlavor {
105 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
114 pub fn as_str(&self) -> &'static str {
116 LldFlavor::Wasm => "wasm",
117 LldFlavor::Ld64 => "darwin",
118 LldFlavor::Ld => "gnu",
119 LldFlavor::Link => "link",
123 fn from_str(s: &str) -> Option<Self> {
125 "darwin" => LldFlavor::Ld64,
126 "gnu" => LldFlavor::Ld,
127 "link" => LldFlavor::Link,
128 "wasm" => LldFlavor::Wasm,
134 impl ToJson for LldFlavor {
135 fn to_json(&self) -> Json {
136 self.as_str().to_json()
140 impl ToJson for LinkerFlavor {
141 fn to_json(&self) -> Json {
142 self.desc().to_json()
145 macro_rules! flavor_mappings {
146 ($((($($flavor:tt)*), $string:expr),)*) => (
148 pub const fn one_of() -> &'static str {
149 concat!("one of: ", $($string, " ",)*)
152 pub fn from_str(s: &str) -> Option<Self> {
154 $($string => $($flavor)*,)*
159 pub fn desc(&self) -> &str {
161 $($($flavor)* => $string,)*
169 ((LinkerFlavor::Em), "em"),
170 ((LinkerFlavor::Gcc), "gcc"),
171 ((LinkerFlavor::L4Bender), "l4-bender"),
172 ((LinkerFlavor::Ld), "ld"),
173 ((LinkerFlavor::Msvc), "msvc"),
174 ((LinkerFlavor::PtxLinker), "ptx-linker"),
175 ((LinkerFlavor::BpfLinker), "bpf-linker"),
176 ((LinkerFlavor::Lld(LldFlavor::Wasm)), "wasm-ld"),
177 ((LinkerFlavor::Lld(LldFlavor::Ld64)), "ld64.lld"),
178 ((LinkerFlavor::Lld(LldFlavor::Ld)), "ld.lld"),
179 ((LinkerFlavor::Lld(LldFlavor::Link)), "lld-link"),
182 #[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
183 pub enum PanicStrategy {
189 pub fn desc(&self) -> &str {
191 PanicStrategy::Unwind => "unwind",
192 PanicStrategy::Abort => "abort",
196 pub const fn desc_symbol(&self) -> Symbol {
198 PanicStrategy::Unwind => sym::unwind,
199 PanicStrategy::Abort => sym::abort,
203 pub const fn all() -> [Symbol; 2] {
204 [Self::Abort.desc_symbol(), Self::Unwind.desc_symbol()]
208 impl ToJson for PanicStrategy {
209 fn to_json(&self) -> Json {
211 PanicStrategy::Abort => "abort".to_json(),
212 PanicStrategy::Unwind => "unwind".to_json(),
217 #[derive(Clone, Copy, Debug, PartialEq, Hash)]
218 pub enum RelroLevel {
226 pub fn desc(&self) -> &str {
228 RelroLevel::Full => "full",
229 RelroLevel::Partial => "partial",
230 RelroLevel::Off => "off",
231 RelroLevel::None => "none",
236 impl FromStr for RelroLevel {
239 fn from_str(s: &str) -> Result<RelroLevel, ()> {
241 "full" => Ok(RelroLevel::Full),
242 "partial" => Ok(RelroLevel::Partial),
243 "off" => Ok(RelroLevel::Off),
244 "none" => Ok(RelroLevel::None),
250 impl ToJson for RelroLevel {
251 fn to_json(&self) -> Json {
253 RelroLevel::Full => "full".to_json(),
254 RelroLevel::Partial => "partial".to_json(),
255 RelroLevel::Off => "off".to_json(),
256 RelroLevel::None => "None".to_json(),
261 #[derive(Clone, Copy, Debug, PartialEq, Hash)]
262 pub enum MergeFunctions {
268 impl MergeFunctions {
269 pub fn desc(&self) -> &str {
271 MergeFunctions::Disabled => "disabled",
272 MergeFunctions::Trampolines => "trampolines",
273 MergeFunctions::Aliases => "aliases",
278 impl FromStr for MergeFunctions {
281 fn from_str(s: &str) -> Result<MergeFunctions, ()> {
283 "disabled" => Ok(MergeFunctions::Disabled),
284 "trampolines" => Ok(MergeFunctions::Trampolines),
285 "aliases" => Ok(MergeFunctions::Aliases),
291 impl ToJson for MergeFunctions {
292 fn to_json(&self) -> Json {
294 MergeFunctions::Disabled => "disabled".to_json(),
295 MergeFunctions::Trampolines => "trampolines".to_json(),
296 MergeFunctions::Aliases => "aliases".to_json(),
301 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
302 pub enum RelocModel {
312 impl FromStr for RelocModel {
315 fn from_str(s: &str) -> Result<RelocModel, ()> {
317 "static" => RelocModel::Static,
318 "pic" => RelocModel::Pic,
319 "pie" => RelocModel::Pie,
320 "dynamic-no-pic" => RelocModel::DynamicNoPic,
321 "ropi" => RelocModel::Ropi,
322 "rwpi" => RelocModel::Rwpi,
323 "ropi-rwpi" => RelocModel::RopiRwpi,
329 impl ToJson for RelocModel {
330 fn to_json(&self) -> Json {
332 RelocModel::Static => "static",
333 RelocModel::Pic => "pic",
334 RelocModel::Pie => "pie",
335 RelocModel::DynamicNoPic => "dynamic-no-pic",
336 RelocModel::Ropi => "ropi",
337 RelocModel::Rwpi => "rwpi",
338 RelocModel::RopiRwpi => "ropi-rwpi",
344 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
353 impl FromStr for CodeModel {
356 fn from_str(s: &str) -> Result<CodeModel, ()> {
358 "tiny" => CodeModel::Tiny,
359 "small" => CodeModel::Small,
360 "kernel" => CodeModel::Kernel,
361 "medium" => CodeModel::Medium,
362 "large" => CodeModel::Large,
368 impl ToJson for CodeModel {
369 fn to_json(&self) -> Json {
371 CodeModel::Tiny => "tiny",
372 CodeModel::Small => "small",
373 CodeModel::Kernel => "kernel",
374 CodeModel::Medium => "medium",
375 CodeModel::Large => "large",
381 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
389 impl FromStr for TlsModel {
392 fn from_str(s: &str) -> Result<TlsModel, ()> {
394 // Note the difference "general" vs "global" difference. The model name is "general",
395 // but the user-facing option name is "global" for consistency with other compilers.
396 "global-dynamic" => TlsModel::GeneralDynamic,
397 "local-dynamic" => TlsModel::LocalDynamic,
398 "initial-exec" => TlsModel::InitialExec,
399 "local-exec" => TlsModel::LocalExec,
405 impl ToJson for TlsModel {
406 fn to_json(&self) -> Json {
408 TlsModel::GeneralDynamic => "global-dynamic",
409 TlsModel::LocalDynamic => "local-dynamic",
410 TlsModel::InitialExec => "initial-exec",
411 TlsModel::LocalExec => "local-exec",
417 /// Everything is flattened to a single enum to make the json encoding/decoding less annoying.
418 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
419 pub enum LinkOutputKind {
420 /// Dynamically linked non position-independent executable.
422 /// Dynamically linked position-independent executable.
424 /// Statically linked non position-independent executable.
426 /// Statically linked position-independent executable.
428 /// Regular dynamic library ("dynamically linked").
430 /// Dynamic library with bundled libc ("statically linked").
432 /// WASI module with a lifetime past the _initialize entry point
436 impl LinkOutputKind {
437 fn as_str(&self) -> &'static str {
439 LinkOutputKind::DynamicNoPicExe => "dynamic-nopic-exe",
440 LinkOutputKind::DynamicPicExe => "dynamic-pic-exe",
441 LinkOutputKind::StaticNoPicExe => "static-nopic-exe",
442 LinkOutputKind::StaticPicExe => "static-pic-exe",
443 LinkOutputKind::DynamicDylib => "dynamic-dylib",
444 LinkOutputKind::StaticDylib => "static-dylib",
445 LinkOutputKind::WasiReactorExe => "wasi-reactor-exe",
449 pub(super) fn from_str(s: &str) -> Option<LinkOutputKind> {
451 "dynamic-nopic-exe" => LinkOutputKind::DynamicNoPicExe,
452 "dynamic-pic-exe" => LinkOutputKind::DynamicPicExe,
453 "static-nopic-exe" => LinkOutputKind::StaticNoPicExe,
454 "static-pic-exe" => LinkOutputKind::StaticPicExe,
455 "dynamic-dylib" => LinkOutputKind::DynamicDylib,
456 "static-dylib" => LinkOutputKind::StaticDylib,
457 "wasi-reactor-exe" => LinkOutputKind::WasiReactorExe,
463 impl fmt::Display for LinkOutputKind {
464 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
465 f.write_str(self.as_str())
469 pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<StaticCow<str>>>;
471 #[derive(Clone, Copy, Hash, Debug, PartialEq, Eq)]
472 pub enum SplitDebuginfo {
473 /// Split debug-information is disabled, meaning that on supported platforms
474 /// you can find all debug information in the executable itself. This is
475 /// only supported for ELF effectively.
477 /// * Windows - not supported
478 /// * macOS - don't run `dsymutil`
479 /// * ELF - `.dwarf_*` sections
482 /// Split debug-information can be found in a "packed" location separate
483 /// from the final artifact. This is supported on all platforms.
485 /// * Windows - `*.pdb`
486 /// * macOS - `*.dSYM` (run `dsymutil`)
487 /// * ELF - `*.dwp` (run `rust-llvm-dwp`)
490 /// Split debug-information can be found in individual object files on the
491 /// filesystem. The main executable may point to the object files.
493 /// * Windows - not supported
494 /// * macOS - supported, scattered object files
495 /// * ELF - supported, scattered `*.dwo` or `*.o` files (see `SplitDwarfKind`)
499 impl SplitDebuginfo {
500 fn as_str(&self) -> &'static str {
502 SplitDebuginfo::Off => "off",
503 SplitDebuginfo::Packed => "packed",
504 SplitDebuginfo::Unpacked => "unpacked",
509 impl FromStr for SplitDebuginfo {
512 fn from_str(s: &str) -> Result<SplitDebuginfo, ()> {
514 "off" => SplitDebuginfo::Off,
515 "unpacked" => SplitDebuginfo::Unpacked,
516 "packed" => SplitDebuginfo::Packed,
522 impl ToJson for SplitDebuginfo {
523 fn to_json(&self) -> Json {
524 self.as_str().to_json()
528 impl fmt::Display for SplitDebuginfo {
529 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
530 f.write_str(self.as_str())
534 #[derive(Clone, Debug, PartialEq, Eq)]
535 pub enum StackProbeType {
536 /// Don't emit any stack probes.
538 /// It is harmless to use this option even on targets that do not have backend support for
539 /// stack probes as the failure mode is the same as if no stack-probe option was specified in
542 /// Call `__rust_probestack` whenever stack needs to be probed.
544 /// Use inline option for LLVM versions later than specified in `min_llvm_version_for_inline`
545 /// and call `__rust_probestack` otherwise.
546 InlineOrCall { min_llvm_version_for_inline: (u32, u32, u32) },
549 impl StackProbeType {
550 fn from_json(json: &Json) -> Result<Self, String> {
551 let object = json.as_object().ok_or_else(|| "expected a JSON object")?;
554 .and_then(|o| o.as_str())
555 .ok_or_else(|| "expected `kind` to be a string")?;
557 "none" => Ok(StackProbeType::None),
558 "inline" => Ok(StackProbeType::Inline),
559 "call" => Ok(StackProbeType::Call),
560 "inline-or-call" => {
561 let min_version = object
562 .get("min-llvm-version-for-inline")
563 .and_then(|o| o.as_array())
564 .ok_or_else(|| "expected `min-llvm-version-for-inline` to be an array")?;
565 let mut iter = min_version.into_iter().map(|v| {
566 let int = v.as_u64().ok_or_else(
567 || "expected `min-llvm-version-for-inline` values to be integers",
570 .map_err(|_| "`min-llvm-version-for-inline` values don't convert to u32")
572 let min_llvm_version_for_inline = (
573 iter.next().unwrap_or(Ok(11))?,
574 iter.next().unwrap_or(Ok(0))?,
575 iter.next().unwrap_or(Ok(0))?,
577 Ok(StackProbeType::InlineOrCall { min_llvm_version_for_inline })
579 _ => Err(String::from(
580 "`kind` expected to be one of `none`, `inline`, `call` or `inline-or-call`",
586 impl ToJson for StackProbeType {
587 fn to_json(&self) -> Json {
588 Json::Object(match self {
589 StackProbeType::None => {
590 [(String::from("kind"), "none".to_json())].into_iter().collect()
592 StackProbeType::Inline => {
593 [(String::from("kind"), "inline".to_json())].into_iter().collect()
595 StackProbeType::Call => {
596 [(String::from("kind"), "call".to_json())].into_iter().collect()
598 StackProbeType::InlineOrCall { min_llvm_version_for_inline: (maj, min, patch) } => [
599 (String::from("kind"), "inline-or-call".to_json()),
601 String::from("min-llvm-version-for-inline"),
602 Json::Array(vec![maj.to_json(), min.to_json(), patch.to_json()]),
611 bitflags::bitflags! {
612 #[derive(Default, Encodable, Decodable)]
613 pub struct SanitizerSet: u8 {
614 const ADDRESS = 1 << 0;
616 const MEMORY = 1 << 2;
617 const THREAD = 1 << 3;
618 const HWADDRESS = 1 << 4;
620 const MEMTAG = 1 << 6;
621 const SHADOWCALLSTACK = 1 << 7;
626 /// Return sanitizer's name
628 /// Returns none if the flags is a set of sanitizers numbering not exactly one.
629 pub fn as_str(self) -> Option<&'static str> {
631 SanitizerSet::ADDRESS => "address",
632 SanitizerSet::CFI => "cfi",
633 SanitizerSet::LEAK => "leak",
634 SanitizerSet::MEMORY => "memory",
635 SanitizerSet::MEMTAG => "memtag",
636 SanitizerSet::SHADOWCALLSTACK => "shadow-call-stack",
637 SanitizerSet::THREAD => "thread",
638 SanitizerSet::HWADDRESS => "hwaddress",
644 /// Formats a sanitizer set as a comma separated list of sanitizers' names.
645 impl fmt::Display for SanitizerSet {
646 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
647 let mut first = true;
649 let name = s.as_str().unwrap_or_else(|| panic!("unrecognized sanitizer {:?}", s));
660 impl IntoIterator for SanitizerSet {
661 type Item = SanitizerSet;
662 type IntoIter = std::vec::IntoIter<SanitizerSet>;
664 fn into_iter(self) -> Self::IntoIter {
666 SanitizerSet::ADDRESS,
669 SanitizerSet::MEMORY,
670 SanitizerSet::MEMTAG,
671 SanitizerSet::SHADOWCALLSTACK,
672 SanitizerSet::THREAD,
673 SanitizerSet::HWADDRESS,
677 .filter(|&s| self.contains(s))
683 impl<CTX> HashStable<CTX> for SanitizerSet {
684 fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher) {
685 self.bits().hash_stable(ctx, hasher);
689 impl ToJson for SanitizerSet {
690 fn to_json(&self) -> Json {
692 .map(|v| Some(v.as_str()?.to_json()))
693 .collect::<Option<Vec<_>>>()
699 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
700 pub enum FramePointer {
701 /// Forces the machine code generator to always preserve the frame pointers.
703 /// Forces the machine code generator to preserve the frame pointers except for the leaf
704 /// functions (i.e. those that don't call other functions).
706 /// Allows the machine code generator to omit the frame pointers.
708 /// This option does not guarantee that the frame pointers will be omitted.
712 impl FromStr for FramePointer {
714 fn from_str(s: &str) -> Result<Self, ()> {
716 "always" => Self::Always,
717 "non-leaf" => Self::NonLeaf,
718 "may-omit" => Self::MayOmit,
724 impl ToJson for FramePointer {
725 fn to_json(&self) -> Json {
727 Self::Always => "always",
728 Self::NonLeaf => "non-leaf",
729 Self::MayOmit => "may-omit",
735 /// Controls use of stack canaries.
736 #[derive(Clone, Copy, Debug, PartialEq, Hash, Eq)]
737 pub enum StackProtector {
738 /// Disable stack canary generation.
741 /// On LLVM, mark all generated LLVM functions with the `ssp` attribute (see
742 /// llvm/docs/LangRef.rst). This triggers stack canary generation in
743 /// functions which contain an array of a byte-sized type with more than
747 /// On LLVM, mark all generated LLVM functions with the `sspstrong`
748 /// attribute (see llvm/docs/LangRef.rst). This triggers stack canary
749 /// generation in functions which either contain an array, or which take
750 /// the address of a local variable.
753 /// Generate stack canaries in all functions.
757 impl StackProtector {
758 fn as_str(&self) -> &'static str {
760 StackProtector::None => "none",
761 StackProtector::Basic => "basic",
762 StackProtector::Strong => "strong",
763 StackProtector::All => "all",
768 impl FromStr for StackProtector {
771 fn from_str(s: &str) -> Result<StackProtector, ()> {
773 "none" => StackProtector::None,
774 "basic" => StackProtector::Basic,
775 "strong" => StackProtector::Strong,
776 "all" => StackProtector::All,
782 impl fmt::Display for StackProtector {
783 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
784 f.write_str(self.as_str())
788 macro_rules! supported_targets {
789 ( $(($( $triple:literal, )+ $module:ident ),)+ ) => {
792 /// List of supported targets
793 pub const TARGETS: &[&str] = &[$($($triple),+),+];
795 fn load_builtin(target: &str) -> Option<Target> {
796 let mut t = match target {
797 $( $($triple)|+ => $module::target(), )+
801 debug!("got builtin target: {:?}", t);
809 // Cannot put this into a separate file without duplication, make an exception.
813 tests_impl::test_target(super::$module::target());
821 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
822 ("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
823 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
824 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
825 ("m68k-unknown-linux-gnu", m68k_unknown_linux_gnu),
826 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
827 ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
828 ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
829 ("mipsisa32r6-unknown-linux-gnu", mipsisa32r6_unknown_linux_gnu),
830 ("mipsisa32r6el-unknown-linux-gnu", mipsisa32r6el_unknown_linux_gnu),
831 ("mipsisa64r6-unknown-linux-gnuabi64", mipsisa64r6_unknown_linux_gnuabi64),
832 ("mipsisa64r6el-unknown-linux-gnuabi64", mipsisa64r6el_unknown_linux_gnuabi64),
833 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
834 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
835 ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
836 ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
837 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
838 ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
839 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
840 ("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
841 ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
842 ("s390x-unknown-linux-musl", s390x_unknown_linux_musl),
843 ("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
844 ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
845 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
846 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
847 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
848 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
849 ("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
850 ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
851 ("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
852 ("armv5te-unknown-linux-uclibceabi", armv5te_unknown_linux_uclibceabi),
853 ("armv7-unknown-linux-gnueabi", armv7_unknown_linux_gnueabi),
854 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
855 ("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
856 ("thumbv7neon-unknown-linux-musleabihf", thumbv7neon_unknown_linux_musleabihf),
857 ("armv7-unknown-linux-musleabi", armv7_unknown_linux_musleabi),
858 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
859 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
860 ("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
861 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
862 ("i686-unknown-linux-musl", i686_unknown_linux_musl),
863 ("i586-unknown-linux-musl", i586_unknown_linux_musl),
864 ("mips-unknown-linux-musl", mips_unknown_linux_musl),
865 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
866 ("mips64-unknown-linux-muslabi64", mips64_unknown_linux_muslabi64),
867 ("mips64el-unknown-linux-muslabi64", mips64el_unknown_linux_muslabi64),
868 ("hexagon-unknown-linux-musl", hexagon_unknown_linux_musl),
870 ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
871 ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
873 ("i686-linux-android", i686_linux_android),
874 ("x86_64-linux-android", x86_64_linux_android),
875 ("arm-linux-androideabi", arm_linux_androideabi),
876 ("armv7-linux-androideabi", armv7_linux_androideabi),
877 ("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
878 ("aarch64-linux-android", aarch64_linux_android),
880 ("x86_64-unknown-none-linuxkernel", x86_64_unknown_none_linuxkernel),
882 ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
883 ("armv6-unknown-freebsd", armv6_unknown_freebsd),
884 ("armv7-unknown-freebsd", armv7_unknown_freebsd),
885 ("i686-unknown-freebsd", i686_unknown_freebsd),
886 ("powerpc-unknown-freebsd", powerpc_unknown_freebsd),
887 ("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
888 ("powerpc64le-unknown-freebsd", powerpc64le_unknown_freebsd),
889 ("riscv64gc-unknown-freebsd", riscv64gc_unknown_freebsd),
890 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
892 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
894 ("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
895 ("i686-unknown-openbsd", i686_unknown_openbsd),
896 ("powerpc-unknown-openbsd", powerpc_unknown_openbsd),
897 ("powerpc64-unknown-openbsd", powerpc64_unknown_openbsd),
898 ("sparc64-unknown-openbsd", sparc64_unknown_openbsd),
899 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
901 ("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
902 ("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
903 ("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
904 ("i686-unknown-netbsd", i686_unknown_netbsd),
905 ("powerpc-unknown-netbsd", powerpc_unknown_netbsd),
906 ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
907 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
909 ("i686-unknown-haiku", i686_unknown_haiku),
910 ("x86_64-unknown-haiku", x86_64_unknown_haiku),
912 ("aarch64-apple-darwin", aarch64_apple_darwin),
913 ("x86_64-apple-darwin", x86_64_apple_darwin),
914 ("i686-apple-darwin", i686_apple_darwin),
916 ("aarch64-fuchsia", aarch64_fuchsia),
917 ("x86_64-fuchsia", x86_64_fuchsia),
919 ("avr-unknown-gnu-atmega328", avr_unknown_gnu_atmega328),
921 ("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
923 ("aarch64-unknown-redox", aarch64_unknown_redox),
924 ("x86_64-unknown-redox", x86_64_unknown_redox),
926 ("i386-apple-ios", i386_apple_ios),
927 ("x86_64-apple-ios", x86_64_apple_ios),
928 ("aarch64-apple-ios", aarch64_apple_ios),
929 ("armv7-apple-ios", armv7_apple_ios),
930 ("armv7s-apple-ios", armv7s_apple_ios),
931 ("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
932 ("aarch64-apple-ios-macabi", aarch64_apple_ios_macabi),
933 ("aarch64-apple-ios-sim", aarch64_apple_ios_sim),
934 ("aarch64-apple-tvos", aarch64_apple_tvos),
935 ("x86_64-apple-tvos", x86_64_apple_tvos),
937 ("armv7k-apple-watchos", armv7k_apple_watchos),
938 ("arm64_32-apple-watchos", arm64_32_apple_watchos),
939 ("x86_64-apple-watchos-sim", x86_64_apple_watchos_sim),
940 ("aarch64-apple-watchos-sim", aarch64_apple_watchos_sim),
942 ("armebv7r-none-eabi", armebv7r_none_eabi),
943 ("armebv7r-none-eabihf", armebv7r_none_eabihf),
944 ("armv7r-none-eabi", armv7r_none_eabi),
945 ("armv7r-none-eabihf", armv7r_none_eabihf),
947 ("x86_64-pc-solaris", x86_64_pc_solaris),
948 ("x86_64-sun-solaris", x86_64_sun_solaris),
949 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
951 ("x86_64-unknown-illumos", x86_64_unknown_illumos),
953 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
954 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
955 ("i686-uwp-windows-gnu", i686_uwp_windows_gnu),
956 ("x86_64-uwp-windows-gnu", x86_64_uwp_windows_gnu),
958 ("aarch64-pc-windows-gnullvm", aarch64_pc_windows_gnullvm),
959 ("x86_64-pc-windows-gnullvm", x86_64_pc_windows_gnullvm),
961 ("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
962 ("aarch64-uwp-windows-msvc", aarch64_uwp_windows_msvc),
963 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
964 ("x86_64-uwp-windows-msvc", x86_64_uwp_windows_msvc),
965 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
966 ("i686-uwp-windows-msvc", i686_uwp_windows_msvc),
967 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
968 ("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
969 ("thumbv7a-uwp-windows-msvc", thumbv7a_uwp_windows_msvc),
971 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
972 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
973 ("wasm32-unknown-unknown", wasm32_unknown_unknown),
974 ("wasm32-wasi", wasm32_wasi),
975 ("wasm64-unknown-unknown", wasm64_unknown_unknown),
977 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
978 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
979 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
980 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
981 ("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
982 ("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
983 ("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
985 ("armv7a-none-eabi", armv7a_none_eabi),
986 ("armv7a-none-eabihf", armv7a_none_eabihf),
988 ("msp430-none-elf", msp430_none_elf),
990 ("aarch64-unknown-hermit", aarch64_unknown_hermit),
991 ("x86_64-unknown-hermit", x86_64_unknown_hermit),
993 ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
994 ("riscv32im-unknown-none-elf", riscv32im_unknown_none_elf),
995 ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
996 ("riscv32imc-esp-espidf", riscv32imc_esp_espidf),
997 ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
998 ("riscv32imac-unknown-xous-elf", riscv32imac_unknown_xous_elf),
999 ("riscv32gc-unknown-linux-gnu", riscv32gc_unknown_linux_gnu),
1000 ("riscv32gc-unknown-linux-musl", riscv32gc_unknown_linux_musl),
1001 ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
1002 ("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
1003 ("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),
1004 ("riscv64gc-unknown-linux-musl", riscv64gc_unknown_linux_musl),
1006 ("aarch64-unknown-none", aarch64_unknown_none),
1007 ("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat),
1009 ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
1011 ("x86_64-unknown-uefi", x86_64_unknown_uefi),
1012 ("i686-unknown-uefi", i686_unknown_uefi),
1013 ("aarch64-unknown-uefi", aarch64_unknown_uefi),
1015 ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
1017 ("i686-wrs-vxworks", i686_wrs_vxworks),
1018 ("x86_64-wrs-vxworks", x86_64_wrs_vxworks),
1019 ("armv7-wrs-vxworks-eabihf", armv7_wrs_vxworks_eabihf),
1020 ("aarch64-wrs-vxworks", aarch64_wrs_vxworks),
1021 ("powerpc-wrs-vxworks", powerpc_wrs_vxworks),
1022 ("powerpc-wrs-vxworks-spe", powerpc_wrs_vxworks_spe),
1023 ("powerpc64-wrs-vxworks", powerpc64_wrs_vxworks),
1025 ("aarch64-kmc-solid_asp3", aarch64_kmc_solid_asp3),
1026 ("armv7a-kmc-solid_asp3-eabi", armv7a_kmc_solid_asp3_eabi),
1027 ("armv7a-kmc-solid_asp3-eabihf", armv7a_kmc_solid_asp3_eabihf),
1029 ("mipsel-sony-psp", mipsel_sony_psp),
1030 ("mipsel-unknown-none", mipsel_unknown_none),
1031 ("thumbv4t-none-eabi", thumbv4t_none_eabi),
1032 ("armv4t-none-eabi", armv4t_none_eabi),
1034 ("aarch64_be-unknown-linux-gnu", aarch64_be_unknown_linux_gnu),
1035 ("aarch64-unknown-linux-gnu_ilp32", aarch64_unknown_linux_gnu_ilp32),
1036 ("aarch64_be-unknown-linux-gnu_ilp32", aarch64_be_unknown_linux_gnu_ilp32),
1038 ("bpfeb-unknown-none", bpfeb_unknown_none),
1039 ("bpfel-unknown-none", bpfel_unknown_none),
1041 ("armv6k-nintendo-3ds", armv6k_nintendo_3ds),
1043 ("aarch64-nintendo-switch-freestanding", aarch64_nintendo_switch_freestanding),
1045 ("armv7-unknown-linux-uclibceabi", armv7_unknown_linux_uclibceabi),
1046 ("armv7-unknown-linux-uclibceabihf", armv7_unknown_linux_uclibceabihf),
1048 ("x86_64-unknown-none", x86_64_unknown_none),
1050 ("mips64-openwrt-linux-musl", mips64_openwrt_linux_musl),
1053 /// Cow-Vec-Str: Cow<'static, [Cow<'static, str>]>
1056 ::std::borrow::Cow::Borrowed(&[])
1058 ($($x:expr),+ $(,)?) => {
1059 ::std::borrow::Cow::Borrowed(&[
1061 ::std::borrow::Cow::Borrowed($x),
1069 /// Warnings encountered when parsing the target `json`.
1071 /// Includes fields that weren't recognized and fields that don't have the expected type.
1072 #[derive(Debug, PartialEq)]
1073 pub struct TargetWarnings {
1074 unused_fields: Vec<String>,
1075 incorrect_type: Vec<String>,
1078 impl TargetWarnings {
1079 pub fn empty() -> Self {
1080 Self { unused_fields: Vec::new(), incorrect_type: Vec::new() }
1083 pub fn warning_messages(&self) -> Vec<String> {
1084 let mut warnings = vec![];
1085 if !self.unused_fields.is_empty() {
1086 warnings.push(format!(
1087 "target json file contains unused fields: {}",
1088 self.unused_fields.join(", ")
1091 if !self.incorrect_type.is_empty() {
1092 warnings.push(format!(
1093 "target json file contains fields whose value doesn't have the correct json type: {}",
1094 self.incorrect_type.join(", ")
1101 /// Everything `rustc` knows about how to compile for a specific target.
1103 /// Every field here must be specified, and has no default value.
1104 #[derive(PartialEq, Clone, Debug)]
1106 /// Target triple to pass to LLVM.
1107 pub llvm_target: StaticCow<str>,
1108 /// Number of bits in a pointer. Influences the `target_pointer_width` `cfg` variable.
1109 pub pointer_width: u32,
1110 /// Architecture to use for ABI considerations. Valid options include: "x86",
1111 /// "x86_64", "arm", "aarch64", "mips", "powerpc", "powerpc64", and others.
1112 pub arch: StaticCow<str>,
1113 /// [Data layout](https://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
1114 pub data_layout: StaticCow<str>,
1115 /// Optional settings with defaults.
1116 pub options: TargetOptions,
1119 pub trait HasTargetSpec {
1120 fn target_spec(&self) -> &Target;
1123 impl HasTargetSpec for Target {
1125 fn target_spec(&self) -> &Target {
1130 type StaticCow<T> = Cow<'static, T>;
1132 /// Optional aspects of a target specification.
1134 /// This has an implementation of `Default`, see each field for what the default is. In general,
1135 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
1137 /// `TargetOptions` as a separate structure is mostly an implementation detail of `Target`
1138 /// construction, all its fields logically belong to `Target` and available from `Target`
1139 /// through `Deref` impls.
1140 #[derive(PartialEq, Clone, Debug)]
1141 pub struct TargetOptions {
1142 /// Whether the target is built-in or loaded from a custom target specification.
1143 pub is_builtin: bool,
1145 /// Used as the `target_endian` `cfg` variable. Defaults to little endian.
1147 /// Width of c_int type. Defaults to "32".
1148 pub c_int_width: StaticCow<str>,
1149 /// OS name to use for conditional compilation (`target_os`). Defaults to "none".
1150 /// "none" implies a bare metal target without `std` library.
1151 /// A couple of targets having `std` also use "unknown" as an `os` value,
1152 /// but they are exceptions.
1153 pub os: StaticCow<str>,
1154 /// Environment name to use for conditional compilation (`target_env`). Defaults to "".
1155 pub env: StaticCow<str>,
1156 /// ABI name to distinguish multiple ABIs on the same OS and architecture. For instance, `"eabi"`
1157 /// or `"eabihf"`. Defaults to "".
1158 pub abi: StaticCow<str>,
1159 /// Vendor name to use for conditional compilation (`target_vendor`). Defaults to "unknown".
1160 pub vendor: StaticCow<str>,
1161 /// Default linker flavor used if `-C linker-flavor` or `-C linker` are not passed
1162 /// on the command line. Defaults to `LinkerFlavor::Gcc`.
1163 pub linker_flavor: LinkerFlavor,
1165 /// Linker to invoke
1166 pub linker: Option<StaticCow<str>>,
1168 /// LLD flavor used if `lld` (or `rust-lld`) is specified as a linker
1169 /// without clarifying its flavor in any way.
1170 pub lld_flavor: LldFlavor,
1172 /// Linker arguments that are passed *before* any user-defined libraries.
1173 pub pre_link_args: LinkArgs,
1174 /// Objects to link before and after all other object code.
1175 pub pre_link_objects: CrtObjects,
1176 pub post_link_objects: CrtObjects,
1177 /// Same as `(pre|post)_link_objects`, but when self-contained linking mode is enabled.
1178 pub pre_link_objects_self_contained: CrtObjects,
1179 pub post_link_objects_self_contained: CrtObjects,
1180 pub link_self_contained: LinkSelfContainedDefault,
1182 /// Linker arguments that are unconditionally passed after any
1183 /// user-defined but before post-link objects. Standard platform
1184 /// libraries that should be always be linked to, usually go here.
1185 pub late_link_args: LinkArgs,
1186 /// Linker arguments used in addition to `late_link_args` if at least one
1187 /// Rust dependency is dynamically linked.
1188 pub late_link_args_dynamic: LinkArgs,
1189 /// Linker arguments used in addition to `late_link_args` if all Rust
1190 /// dependencies are statically linked.
1191 pub late_link_args_static: LinkArgs,
1192 /// Linker arguments that are unconditionally passed *after* any
1193 /// user-defined libraries.
1194 pub post_link_args: LinkArgs,
1195 /// Optional link script applied to `dylib` and `executable` crate types.
1196 /// This is a string containing the script, not a path. Can only be applied
1197 /// to linkers where `linker_is_gnu` is true.
1198 pub link_script: Option<StaticCow<str>>,
1200 /// Environment variables to be set for the linker invocation.
1201 pub link_env: StaticCow<[(StaticCow<str>, StaticCow<str>)]>,
1202 /// Environment variables to be removed for the linker invocation.
1203 pub link_env_remove: StaticCow<[StaticCow<str>]>,
1205 /// Extra arguments to pass to the external assembler (when used)
1206 pub asm_args: StaticCow<[StaticCow<str>]>,
1208 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
1210 pub cpu: StaticCow<str>,
1211 /// Default target features to pass to LLVM. These features will *always* be
1212 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
1213 /// -mattr=$features`.
1214 pub features: StaticCow<str>,
1215 /// Whether dynamic linking is available on this target. Defaults to false.
1216 pub dynamic_linking: bool,
1217 /// If dynamic linking is available, whether only cdylibs are supported.
1218 pub only_cdylib: bool,
1219 /// Whether executables are available on this target. Defaults to true.
1220 pub executables: bool,
1221 /// Relocation model to use in object file. Corresponds to `llc
1222 /// -relocation-model=$relocation_model`. Defaults to `Pic`.
1223 pub relocation_model: RelocModel,
1224 /// Code model to use. Corresponds to `llc -code-model=$code_model`.
1225 /// Defaults to `None` which means "inherited from the base LLVM target".
1226 pub code_model: Option<CodeModel>,
1227 /// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
1228 /// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
1229 pub tls_model: TlsModel,
1230 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
1231 pub disable_redzone: bool,
1232 /// Frame pointer mode for this target. Defaults to `MayOmit`.
1233 pub frame_pointer: FramePointer,
1234 /// Emit each function in its own section. Defaults to true.
1235 pub function_sections: bool,
1236 /// String to prepend to the name of every dynamic library. Defaults to "lib".
1237 pub dll_prefix: StaticCow<str>,
1238 /// String to append to the name of every dynamic library. Defaults to ".so".
1239 pub dll_suffix: StaticCow<str>,
1240 /// String to append to the name of every executable.
1241 pub exe_suffix: StaticCow<str>,
1242 /// String to prepend to the name of every static library. Defaults to "lib".
1243 pub staticlib_prefix: StaticCow<str>,
1244 /// String to append to the name of every static library. Defaults to ".a".
1245 pub staticlib_suffix: StaticCow<str>,
1246 /// Values of the `target_family` cfg set for this target.
1248 /// Common options are: "unix", "windows". Defaults to no families.
1250 /// See <https://doc.rust-lang.org/reference/conditional-compilation.html#target_family>.
1251 pub families: StaticCow<[StaticCow<str>]>,
1252 /// Whether the target toolchain's ABI supports returning small structs as an integer.
1253 pub abi_return_struct_as_int: bool,
1254 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
1255 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
1256 pub is_like_osx: bool,
1257 /// Whether the target toolchain is like Solaris's.
1258 /// Only useful for compiling against Illumos/Solaris,
1259 /// as they have a different set of linker flags. Defaults to false.
1260 pub is_like_solaris: bool,
1261 /// Whether the target is like Windows.
1262 /// This is a combination of several more specific properties represented as a single flag:
1263 /// - The target uses a Windows ABI,
1264 /// - uses PE/COFF as a format for object code,
1265 /// - uses Windows-style dllexport/dllimport for shared libraries,
1266 /// - uses import libraries and .def files for symbol exports,
1267 /// - executables support setting a subsystem.
1268 pub is_like_windows: bool,
1269 /// Whether the target is like MSVC.
1270 /// This is a combination of several more specific properties represented as a single flag:
1271 /// - The target has all the properties from `is_like_windows`
1272 /// (for in-tree targets "is_like_msvc ⇒ is_like_windows" is ensured by a unit test),
1273 /// - has some MSVC-specific Windows ABI properties,
1274 /// - uses a link.exe-like linker,
1275 /// - uses CodeView/PDB for debuginfo and natvis for its visualization,
1276 /// - uses SEH-based unwinding,
1277 /// - supports control flow guard mechanism.
1278 pub is_like_msvc: bool,
1279 /// Whether a target toolchain is like WASM.
1280 pub is_like_wasm: bool,
1281 /// Default supported version of DWARF on this platform.
1282 /// Useful because some platforms (osx, bsd) only want up to DWARF2.
1283 pub default_dwarf_version: u32,
1284 /// Whether the linker support GNU-like arguments such as -O. Defaults to true.
1285 pub linker_is_gnu: bool,
1286 /// The MinGW toolchain has a known issue that prevents it from correctly
1287 /// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
1288 /// symbol needs its own COMDAT section, weak linkage implies a large
1289 /// number sections that easily exceeds the given limit for larger
1290 /// codebases. Consequently we want a way to disallow weak linkage on some
1292 pub allows_weak_linkage: bool,
1293 /// Whether the linker support rpaths or not. Defaults to false.
1294 pub has_rpath: bool,
1295 /// Whether to disable linking to the default libraries, typically corresponds
1296 /// to `-nodefaultlibs`. Defaults to true.
1297 pub no_default_libraries: bool,
1298 /// Dynamically linked executables can be compiled as position independent
1299 /// if the default relocation model of position independent code is not
1300 /// changed. This is a requirement to take advantage of ASLR, as otherwise
1301 /// the functions in the executable are not randomized and can be used
1302 /// during an exploit of a vulnerability in any code.
1303 pub position_independent_executables: bool,
1304 /// Executables that are both statically linked and position-independent are supported.
1305 pub static_position_independent_executables: bool,
1306 /// Determines if the target always requires using the PLT for indirect
1307 /// library calls or not. This controls the default value of the `-Z plt` flag.
1308 pub needs_plt: bool,
1309 /// Either partial, full, or off. Full RELRO makes the dynamic linker
1310 /// resolve all symbols at startup and marks the GOT read-only before
1311 /// starting the program, preventing overwriting the GOT.
1312 pub relro_level: RelroLevel,
1313 /// Format that archives should be emitted in. This affects whether we use
1314 /// LLVM to assemble an archive or fall back to the system linker, and
1315 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
1316 /// the system linker to be used.
1317 pub archive_format: StaticCow<str>,
1318 /// Is asm!() allowed? Defaults to true.
1319 pub allow_asm: bool,
1320 /// Whether the runtime startup code requires the `main` function be passed
1321 /// `argc` and `argv` values.
1322 pub main_needs_argc_argv: bool,
1324 /// Flag indicating whether #[thread_local] is available for this target.
1325 pub has_thread_local: bool,
1326 // This is mainly for easy compatibility with emscripten.
1327 // If we give emcc .o files that are actually .bc files it
1328 // will 'just work'.
1329 pub obj_is_bitcode: bool,
1330 /// Whether the target requires that emitted object code includes bitcode.
1331 pub forces_embed_bitcode: bool,
1332 /// Content of the LLVM cmdline section associated with embedded bitcode.
1333 pub bitcode_llvm_cmdline: StaticCow<str>,
1335 /// Don't use this field; instead use the `.min_atomic_width()` method.
1336 pub min_atomic_width: Option<u64>,
1338 /// Don't use this field; instead use the `.max_atomic_width()` method.
1339 pub max_atomic_width: Option<u64>,
1341 /// Whether the target supports atomic CAS operations natively
1342 pub atomic_cas: bool,
1344 /// Panic strategy: "unwind" or "abort"
1345 pub panic_strategy: PanicStrategy,
1347 /// Whether or not linking dylibs to a static CRT is allowed.
1348 pub crt_static_allows_dylibs: bool,
1349 /// Whether or not the CRT is statically linked by default.
1350 pub crt_static_default: bool,
1351 /// Whether or not crt-static is respected by the compiler (or is a no-op).
1352 pub crt_static_respected: bool,
1354 /// The implementation of stack probes to use.
1355 pub stack_probes: StackProbeType,
1357 /// The minimum alignment for global symbols.
1358 pub min_global_align: Option<u64>,
1360 /// Default number of codegen units to use in debug mode
1361 pub default_codegen_units: Option<u64>,
1363 /// Whether to generate trap instructions in places where optimization would
1364 /// otherwise produce control flow that falls through into unrelated memory.
1365 pub trap_unreachable: bool,
1367 /// This target requires everything to be compiled with LTO to emit a final
1368 /// executable, aka there is no native linker for this target.
1369 pub requires_lto: bool,
1371 /// This target has no support for threads.
1372 pub singlethread: bool,
1374 /// Whether library functions call lowering/optimization is disabled in LLVM
1375 /// for this target unconditionally.
1376 pub no_builtins: bool,
1378 /// The default visibility for symbols in this target should be "hidden"
1379 /// rather than "default"
1380 pub default_hidden_visibility: bool,
1382 /// Whether a .debug_gdb_scripts section will be added to the output object file
1383 pub emit_debug_gdb_scripts: bool,
1385 /// Whether or not to unconditionally `uwtable` attributes on functions,
1386 /// typically because the platform needs to unwind for things like stack
1388 pub requires_uwtable: bool,
1390 /// Whether or not to emit `uwtable` attributes on functions if `-C force-unwind-tables`
1391 /// is not specified and `uwtable` is not required on this target.
1392 pub default_uwtable: bool,
1394 /// Whether or not SIMD types are passed by reference in the Rust ABI,
1395 /// typically required if a target can be compiled with a mixed set of
1396 /// target features. This is `true` by default, and `false` for targets like
1397 /// wasm32 where the whole program either has simd or not.
1398 pub simd_types_indirect: bool,
1400 /// Pass a list of symbol which should be exported in the dylib to the linker.
1401 pub limit_rdylib_exports: bool,
1403 /// If set, have the linker export exactly these symbols, instead of using
1404 /// the usual logic to figure this out from the crate itself.
1405 pub override_export_symbols: Option<StaticCow<[StaticCow<str>]>>,
1407 /// Determines how or whether the MergeFunctions LLVM pass should run for
1408 /// this target. Either "disabled", "trampolines", or "aliases".
1409 /// The MergeFunctions pass is generally useful, but some targets may need
1410 /// to opt out. The default is "aliases".
1412 /// Workaround for: <https://github.com/rust-lang/rust/issues/57356>
1413 pub merge_functions: MergeFunctions,
1415 /// Use platform dependent mcount function
1416 pub mcount: StaticCow<str>,
1418 /// LLVM ABI name, corresponds to the '-mabi' parameter available in multilib C compilers
1419 pub llvm_abiname: StaticCow<str>,
1421 /// Whether or not RelaxElfRelocation flag will be passed to the linker
1422 pub relax_elf_relocations: bool,
1424 /// Additional arguments to pass to LLVM, similar to the `-C llvm-args` codegen option.
1425 pub llvm_args: StaticCow<[StaticCow<str>]>,
1427 /// Whether to use legacy .ctors initialization hooks rather than .init_array. Defaults
1428 /// to false (uses .init_array).
1429 pub use_ctors_section: bool,
1431 /// Whether the linker is instructed to add a `GNU_EH_FRAME` ELF header
1432 /// used to locate unwinding information is passed
1433 /// (only has effect if the linker is `ld`-like).
1434 pub eh_frame_header: bool,
1436 /// Is true if the target is an ARM architecture using thumb v1 which allows for
1437 /// thumb and arm interworking.
1438 pub has_thumb_interworking: bool,
1440 /// How to handle split debug information, if at all. Specifying `None` has
1441 /// target-specific meaning.
1442 pub split_debuginfo: SplitDebuginfo,
1444 /// The sanitizers supported by this target
1446 /// Note that the support here is at a codegen level. If the machine code with sanitizer
1447 /// enabled can generated on this target, but the necessary supporting libraries are not
1448 /// distributed with the target, the sanitizer should still appear in this list for the target.
1449 pub supported_sanitizers: SanitizerSet,
1451 /// If present it's a default value to use for adjusting the C ABI.
1452 pub default_adjusted_cabi: Option<Abi>,
1454 /// Minimum number of bits in #[repr(C)] enum. Defaults to 32.
1455 pub c_enum_min_bits: u64,
1457 /// Whether or not the DWARF `.debug_aranges` section should be generated.
1458 pub generate_arange_section: bool,
1460 /// Whether the target supports stack canary checks. `true` by default,
1461 /// since this is most common among tier 1 and tier 2 targets.
1462 pub supports_stack_protector: bool,
1465 /// Add arguments for the given flavor and also for its "twin" flavors
1466 /// that have a compatible command line interface.
1467 fn add_link_args(link_args: &mut LinkArgs, flavor: LinkerFlavor, args: &[&'static str]) {
1468 let mut insert = |flavor| {
1469 link_args.entry(flavor).or_default().extend(args.iter().copied().map(Cow::Borrowed))
1473 LinkerFlavor::Ld => insert(LinkerFlavor::Lld(LldFlavor::Ld)),
1474 LinkerFlavor::Msvc => insert(LinkerFlavor::Lld(LldFlavor::Link)),
1475 LinkerFlavor::Lld(LldFlavor::Wasm) => {}
1476 LinkerFlavor::Lld(lld_flavor) => {
1477 panic!("add_link_args: use non-LLD flavor for {:?}", lld_flavor)
1481 | LinkerFlavor::L4Bender
1482 | LinkerFlavor::BpfLinker
1483 | LinkerFlavor::PtxLinker => {}
1487 impl TargetOptions {
1488 fn link_args(flavor: LinkerFlavor, args: &[&'static str]) -> LinkArgs {
1489 let mut link_args = LinkArgs::new();
1490 add_link_args(&mut link_args, flavor, args);
1494 fn add_pre_link_args(&mut self, flavor: LinkerFlavor, args: &[&'static str]) {
1495 add_link_args(&mut self.pre_link_args, flavor, args);
1498 fn add_post_link_args(&mut self, flavor: LinkerFlavor, args: &[&'static str]) {
1499 add_link_args(&mut self.post_link_args, flavor, args);
1503 impl Default for TargetOptions {
1504 /// Creates a set of "sane defaults" for any target. This is still
1505 /// incomplete, and if used for compilation, will certainly not work.
1506 fn default() -> TargetOptions {
1509 endian: Endian::Little,
1510 c_int_width: "32".into(),
1514 vendor: "unknown".into(),
1515 linker_flavor: LinkerFlavor::Gcc,
1516 linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.into()),
1517 lld_flavor: LldFlavor::Ld,
1518 pre_link_args: LinkArgs::new(),
1519 post_link_args: LinkArgs::new(),
1522 cpu: "generic".into(),
1523 features: "".into(),
1524 dynamic_linking: false,
1527 relocation_model: RelocModel::Pic,
1529 tls_model: TlsModel::GeneralDynamic,
1530 disable_redzone: false,
1531 frame_pointer: FramePointer::MayOmit,
1532 function_sections: true,
1533 dll_prefix: "lib".into(),
1534 dll_suffix: ".so".into(),
1535 exe_suffix: "".into(),
1536 staticlib_prefix: "lib".into(),
1537 staticlib_suffix: ".a".into(),
1539 abi_return_struct_as_int: false,
1541 is_like_solaris: false,
1542 is_like_windows: false,
1543 is_like_msvc: false,
1544 is_like_wasm: false,
1545 default_dwarf_version: 4,
1546 linker_is_gnu: true,
1547 allows_weak_linkage: true,
1549 no_default_libraries: true,
1550 position_independent_executables: false,
1551 static_position_independent_executables: false,
1553 relro_level: RelroLevel::None,
1554 pre_link_objects: Default::default(),
1555 post_link_objects: Default::default(),
1556 pre_link_objects_self_contained: Default::default(),
1557 post_link_objects_self_contained: Default::default(),
1558 link_self_contained: LinkSelfContainedDefault::False,
1559 late_link_args: LinkArgs::new(),
1560 late_link_args_dynamic: LinkArgs::new(),
1561 late_link_args_static: LinkArgs::new(),
1563 link_env_remove: cvs![],
1564 archive_format: "gnu".into(),
1565 main_needs_argc_argv: true,
1567 has_thread_local: false,
1568 obj_is_bitcode: false,
1569 forces_embed_bitcode: false,
1570 bitcode_llvm_cmdline: "".into(),
1571 min_atomic_width: None,
1572 max_atomic_width: None,
1574 panic_strategy: PanicStrategy::Unwind,
1575 crt_static_allows_dylibs: false,
1576 crt_static_default: false,
1577 crt_static_respected: false,
1578 stack_probes: StackProbeType::None,
1579 min_global_align: None,
1580 default_codegen_units: None,
1581 trap_unreachable: true,
1582 requires_lto: false,
1583 singlethread: false,
1585 default_hidden_visibility: false,
1586 emit_debug_gdb_scripts: true,
1587 requires_uwtable: false,
1588 default_uwtable: false,
1589 simd_types_indirect: true,
1590 limit_rdylib_exports: true,
1591 override_export_symbols: None,
1592 merge_functions: MergeFunctions::Aliases,
1593 mcount: "mcount".into(),
1594 llvm_abiname: "".into(),
1595 relax_elf_relocations: false,
1597 use_ctors_section: false,
1598 eh_frame_header: true,
1599 has_thumb_interworking: false,
1600 split_debuginfo: SplitDebuginfo::Off,
1601 supported_sanitizers: SanitizerSet::empty(),
1602 default_adjusted_cabi: None,
1603 c_enum_min_bits: 32,
1604 generate_arange_section: true,
1605 supports_stack_protector: true,
1610 /// `TargetOptions` being a separate type is basically an implementation detail of `Target` that is
1611 /// used for providing defaults. Perhaps there's a way to merge `TargetOptions` into `Target` so
1612 /// this `Deref` implementation is no longer necessary.
1613 impl Deref for Target {
1614 type Target = TargetOptions;
1617 fn deref(&self) -> &Self::Target {
1621 impl DerefMut for Target {
1623 fn deref_mut(&mut self) -> &mut Self::Target {
1629 /// Given a function ABI, turn it into the correct ABI for this target.
1630 pub fn adjust_abi(&self, abi: Abi) -> Abi {
1632 Abi::C { .. } => self.default_adjusted_cabi.unwrap_or(abi),
1633 Abi::System { unwind } if self.is_like_windows && self.arch == "x86" => {
1634 Abi::Stdcall { unwind }
1636 Abi::System { unwind } => Abi::C { unwind },
1637 Abi::EfiApi if self.arch == "x86_64" => Abi::Win64 { unwind: false },
1638 Abi::EfiApi => Abi::C { unwind: false },
1640 // See commentary in `is_abi_supported`.
1641 Abi::Stdcall { .. } | Abi::Thiscall { .. } if self.arch == "x86" => abi,
1642 Abi::Stdcall { unwind } | Abi::Thiscall { unwind } => Abi::C { unwind },
1643 Abi::Fastcall { .. } if self.arch == "x86" => abi,
1644 Abi::Vectorcall { .. } if ["x86", "x86_64"].contains(&&self.arch[..]) => abi,
1645 Abi::Fastcall { unwind } | Abi::Vectorcall { unwind } => Abi::C { unwind },
1651 /// Returns a None if the UNSUPPORTED_CALLING_CONVENTIONS lint should be emitted
1652 pub fn is_abi_supported(&self, abi: Abi) -> Option<bool> {
1665 X86Interrupt => ["x86", "x86_64"].contains(&&self.arch[..]),
1666 Aapcs { .. } => "arm" == self.arch,
1667 CCmseNonSecureCall => ["arm", "aarch64"].contains(&&self.arch[..]),
1668 Win64 { .. } | SysV64 { .. } => self.arch == "x86_64",
1669 PtxKernel => self.arch == "nvptx64",
1670 Msp430Interrupt => self.arch == "msp430",
1671 AmdGpuKernel => self.arch == "amdgcn",
1672 AvrInterrupt | AvrNonBlockingInterrupt => self.arch == "avr",
1673 Wasm => ["wasm32", "wasm64"].contains(&&self.arch[..]),
1674 Thiscall { .. } => self.arch == "x86",
1675 // On windows these fall-back to platform native calling convention (C) when the
1676 // architecture is not supported.
1678 // This is I believe a historical accident that has occurred as part of Microsoft
1679 // striving to allow most of the code to "just" compile when support for 64-bit x86
1680 // was added and then later again, when support for ARM architectures was added.
1682 // This is well documented across MSDN. Support for this in Rust has been added in
1683 // #54576. This makes much more sense in context of Microsoft's C++ than it does in
1684 // Rust, but there isn't much leeway remaining here to change it back at the time this
1685 // comment has been written.
1687 // Following are the relevant excerpts from the MSDN documentation.
1689 // > The __vectorcall calling convention is only supported in native code on x86 and
1690 // x64 processors that include Streaming SIMD Extensions 2 (SSE2) and above.
1692 // > On ARM machines, __vectorcall is accepted and ignored by the compiler.
1694 // -- https://docs.microsoft.com/en-us/cpp/cpp/vectorcall?view=msvc-160
1696 // > On ARM and x64 processors, __stdcall is accepted and ignored by the compiler;
1698 // -- https://docs.microsoft.com/en-us/cpp/cpp/stdcall?view=msvc-160
1700 // > In most cases, keywords or compiler switches that specify an unsupported
1701 // > convention on a particular platform are ignored, and the platform default
1702 // > convention is used.
1704 // -- https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
1705 Stdcall { .. } | Fastcall { .. } | Vectorcall { .. } if self.is_like_windows => true,
1706 // Outside of Windows we want to only support these calling conventions for the
1707 // architectures for which these calling conventions are actually well defined.
1708 Stdcall { .. } | Fastcall { .. } if self.arch == "x86" => true,
1709 Vectorcall { .. } if ["x86", "x86_64"].contains(&&self.arch[..]) => true,
1710 // Return a `None` for other cases so that we know to emit a future compat lint.
1711 Stdcall { .. } | Fastcall { .. } | Vectorcall { .. } => return None,
1715 /// Minimum integer size in bits that this target can perform atomic
1717 pub fn min_atomic_width(&self) -> u64 {
1718 self.min_atomic_width.unwrap_or(8)
1721 /// Maximum integer size in bits that this target can perform atomic
1723 pub fn max_atomic_width(&self) -> u64 {
1724 self.max_atomic_width.unwrap_or_else(|| self.pointer_width.into())
1727 /// Loads a target descriptor from a JSON object.
1728 pub fn from_json(obj: Json) -> Result<(Target, TargetWarnings), String> {
1729 // While ugly, this code must remain this way to retain
1730 // compatibility with existing JSON fields and the internal
1731 // expected naming of the Target and TargetOptions structs.
1732 // To ensure compatibility is retained, the built-in targets
1733 // are round-tripped through this code to catch cases where
1734 // the JSON parser is not updated to match the structs.
1736 let mut obj = match obj {
1737 Value::Object(obj) => obj,
1738 _ => return Err("Expected JSON object for target")?,
1741 let mut get_req_field = |name: &str| {
1743 .and_then(|j| j.as_str().map(str::to_string))
1744 .ok_or_else(|| format!("Field {} in target specification is required", name))
1747 let mut base = Target {
1748 llvm_target: get_req_field("llvm-target")?.into(),
1749 pointer_width: get_req_field("target-pointer-width")?
1751 .map_err(|_| "target-pointer-width must be an integer".to_string())?,
1752 data_layout: get_req_field("data-layout")?.into(),
1753 arch: get_req_field("arch")?.into(),
1754 options: Default::default(),
1757 let mut incorrect_type = vec![];
1760 ($key_name:ident) => ( {
1761 let name = (stringify!($key_name)).replace("_", "-");
1762 if let Some(s) = obj.remove(&name).and_then(|s| s.as_str().map(str::to_string).map(Cow::from)) {
1766 ($key_name:ident = $json_name:expr) => ( {
1767 let name = $json_name;
1768 if let Some(s) = obj.remove(name).and_then(|s| s.as_str().map(str::to_string).map(Cow::from)) {
1772 ($key_name:ident, bool) => ( {
1773 let name = (stringify!($key_name)).replace("_", "-");
1774 if let Some(s) = obj.remove(&name).and_then(|b| b.as_bool()) {
1778 ($key_name:ident, u64) => ( {
1779 let name = (stringify!($key_name)).replace("_", "-");
1780 if let Some(s) = obj.remove(&name).and_then(|j| Json::as_u64(&j)) {
1784 ($key_name:ident, u32) => ( {
1785 let name = (stringify!($key_name)).replace("_", "-");
1786 if let Some(s) = obj.remove(&name).and_then(|b| b.as_u64()) {
1788 return Err("Not a valid DWARF version number".into());
1790 base.$key_name = s as u32;
1793 ($key_name:ident, Option<u64>) => ( {
1794 let name = (stringify!($key_name)).replace("_", "-");
1795 if let Some(s) = obj.remove(&name).and_then(|b| b.as_u64()) {
1796 base.$key_name = Some(s);
1799 ($key_name:ident, MergeFunctions) => ( {
1800 let name = (stringify!($key_name)).replace("_", "-");
1801 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1802 match s.parse::<MergeFunctions>() {
1803 Ok(mergefunc) => base.$key_name = mergefunc,
1804 _ => return Some(Err(format!("'{}' is not a valid value for \
1805 merge-functions. Use 'disabled', \
1806 'trampolines', or 'aliases'.",
1810 })).unwrap_or(Ok(()))
1812 ($key_name:ident, RelocModel) => ( {
1813 let name = (stringify!($key_name)).replace("_", "-");
1814 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1815 match s.parse::<RelocModel>() {
1816 Ok(relocation_model) => base.$key_name = relocation_model,
1817 _ => return Some(Err(format!("'{}' is not a valid relocation model. \
1818 Run `rustc --print relocation-models` to \
1819 see the list of supported values.", s))),
1822 })).unwrap_or(Ok(()))
1824 ($key_name:ident, CodeModel) => ( {
1825 let name = (stringify!($key_name)).replace("_", "-");
1826 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1827 match s.parse::<CodeModel>() {
1828 Ok(code_model) => base.$key_name = Some(code_model),
1829 _ => return Some(Err(format!("'{}' is not a valid code model. \
1830 Run `rustc --print code-models` to \
1831 see the list of supported values.", s))),
1834 })).unwrap_or(Ok(()))
1836 ($key_name:ident, TlsModel) => ( {
1837 let name = (stringify!($key_name)).replace("_", "-");
1838 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1839 match s.parse::<TlsModel>() {
1840 Ok(tls_model) => base.$key_name = tls_model,
1841 _ => return Some(Err(format!("'{}' is not a valid TLS model. \
1842 Run `rustc --print tls-models` to \
1843 see the list of supported values.", s))),
1846 })).unwrap_or(Ok(()))
1848 ($key_name:ident, PanicStrategy) => ( {
1849 let name = (stringify!($key_name)).replace("_", "-");
1850 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1852 "unwind" => base.$key_name = PanicStrategy::Unwind,
1853 "abort" => base.$key_name = PanicStrategy::Abort,
1854 _ => return Some(Err(format!("'{}' is not a valid value for \
1855 panic-strategy. Use 'unwind' or 'abort'.",
1859 })).unwrap_or(Ok(()))
1861 ($key_name:ident, RelroLevel) => ( {
1862 let name = (stringify!($key_name)).replace("_", "-");
1863 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1864 match s.parse::<RelroLevel>() {
1865 Ok(level) => base.$key_name = level,
1866 _ => return Some(Err(format!("'{}' is not a valid value for \
1867 relro-level. Use 'full', 'partial, or 'off'.",
1871 })).unwrap_or(Ok(()))
1873 ($key_name:ident, SplitDebuginfo) => ( {
1874 let name = (stringify!($key_name)).replace("_", "-");
1875 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1876 match s.parse::<SplitDebuginfo>() {
1877 Ok(level) => base.$key_name = level,
1878 _ => return Some(Err(format!("'{}' is not a valid value for \
1879 split-debuginfo. Use 'off' or 'dsymutil'.",
1883 })).unwrap_or(Ok(()))
1885 ($key_name:ident, list) => ( {
1886 let name = (stringify!($key_name)).replace("_", "-");
1887 if let Some(j) = obj.remove(&name) {
1888 if let Some(v) = j.as_array() {
1889 base.$key_name = v.iter()
1890 .map(|a| a.as_str().unwrap().to_string().into())
1893 incorrect_type.push(name)
1897 ($key_name:ident, opt_list) => ( {
1898 let name = (stringify!($key_name)).replace("_", "-");
1899 if let Some(j) = obj.remove(&name) {
1900 if let Some(v) = j.as_array() {
1901 base.$key_name = Some(v.iter()
1902 .map(|a| a.as_str().unwrap().to_string().into())
1905 incorrect_type.push(name)
1909 ($key_name:ident, optional) => ( {
1910 let name = (stringify!($key_name)).replace("_", "-");
1911 if let Some(o) = obj.remove(&name) {
1914 .map(|s| s.to_string().into());
1917 ($key_name:ident, LldFlavor) => ( {
1918 let name = (stringify!($key_name)).replace("_", "-");
1919 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1920 if let Some(flavor) = LldFlavor::from_str(&s) {
1921 base.$key_name = flavor;
1923 return Some(Err(format!(
1924 "'{}' is not a valid value for lld-flavor. \
1925 Use 'darwin', 'gnu', 'link' or 'wasm.",
1929 })).unwrap_or(Ok(()))
1931 ($key_name:ident, LinkerFlavor) => ( {
1932 let name = (stringify!($key_name)).replace("_", "-");
1933 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
1934 match LinkerFlavor::from_str(s) {
1935 Some(linker_flavor) => base.$key_name = linker_flavor,
1936 _ => return Some(Err(format!("'{}' is not a valid value for linker-flavor. \
1937 Use {}", s, LinkerFlavor::one_of()))),
1940 })).unwrap_or(Ok(()))
1942 ($key_name:ident, StackProbeType) => ( {
1943 let name = (stringify!($key_name)).replace("_", "-");
1944 obj.remove(&name).and_then(|o| match StackProbeType::from_json(&o) {
1950 format!("`{:?}` is not a valid value for `{}`: {}", o, name, s)
1952 }).unwrap_or(Ok(()))
1954 ($key_name:ident, SanitizerSet) => ( {
1955 let name = (stringify!($key_name)).replace("_", "-");
1956 if let Some(o) = obj.remove(&name) {
1957 if let Some(a) = o.as_array() {
1959 base.$key_name |= match s.as_str() {
1960 Some("address") => SanitizerSet::ADDRESS,
1961 Some("cfi") => SanitizerSet::CFI,
1962 Some("leak") => SanitizerSet::LEAK,
1963 Some("memory") => SanitizerSet::MEMORY,
1964 Some("memtag") => SanitizerSet::MEMTAG,
1965 Some("shadow-call-stack") => SanitizerSet::SHADOWCALLSTACK,
1966 Some("thread") => SanitizerSet::THREAD,
1967 Some("hwaddress") => SanitizerSet::HWADDRESS,
1968 Some(s) => return Err(format!("unknown sanitizer {}", s)),
1969 _ => return Err(format!("not a string: {:?}", s)),
1973 incorrect_type.push(name)
1976 Ok::<(), String>(())
1979 ($key_name:ident = $json_name:expr, link_self_contained) => ( {
1980 let name = $json_name;
1981 obj.remove(name).and_then(|o| o.as_str().and_then(|s| {
1982 match s.parse::<LinkSelfContainedDefault>() {
1983 Ok(lsc_default) => base.$key_name = lsc_default,
1984 _ => return Some(Err(format!("'{}' is not a valid `-Clink-self-contained` default. \
1985 Use 'false', 'true', 'musl' or 'mingw'", s))),
1988 })).unwrap_or(Ok(()))
1990 ($key_name:ident = $json_name:expr, link_objects) => ( {
1991 let name = $json_name;
1992 if let Some(val) = obj.remove(name) {
1993 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
1994 JSON object with fields per CRT object kind.", name))?;
1995 let mut args = CrtObjects::new();
1997 let kind = LinkOutputKind::from_str(&k).ok_or_else(|| {
1998 format!("{}: '{}' is not a valid value for CRT object kind. \
1999 Use '(dynamic,static)-(nopic,pic)-exe' or \
2000 '(dynamic,static)-dylib' or 'wasi-reactor-exe'", name, k)
2003 let v = v.as_array().ok_or_else(||
2004 format!("{}.{}: expected a JSON array", name, k)
2005 )?.iter().enumerate()
2007 let s = s.as_str().ok_or_else(||
2008 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
2009 Ok(s.to_string().into())
2011 .collect::<Result<Vec<_>, String>>()?;
2013 args.insert(kind, v);
2015 base.$key_name = args;
2018 ($key_name:ident, link_args) => ( {
2019 let name = (stringify!($key_name)).replace("_", "-");
2020 if let Some(val) = obj.remove(&name) {
2021 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
2022 JSON object with fields per linker-flavor.", name))?;
2023 let mut args = LinkArgs::new();
2025 let flavor = LinkerFlavor::from_str(&k).ok_or_else(|| {
2026 format!("{}: '{}' is not a valid value for linker-flavor. \
2027 Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
2030 let v = v.as_array().ok_or_else(||
2031 format!("{}.{}: expected a JSON array", name, k)
2032 )?.iter().enumerate()
2034 let s = s.as_str().ok_or_else(||
2035 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
2036 Ok(s.to_string().into())
2038 .collect::<Result<Vec<_>, String>>()?;
2040 args.insert(flavor, v);
2042 base.$key_name = args;
2045 ($key_name:ident, env) => ( {
2046 let name = (stringify!($key_name)).replace("_", "-");
2047 if let Some(o) = obj.remove(&name) {
2048 if let Some(a) = o.as_array() {
2050 if let Some(s) = o.as_str() {
2051 let p = s.split('=').collect::<Vec<_>>();
2053 let k = p[0].to_string();
2054 let v = p[1].to_string();
2055 base.$key_name.to_mut().push((k.into(), v.into()));
2060 incorrect_type.push(name)
2064 ($key_name:ident, Option<Abi>) => ( {
2065 let name = (stringify!($key_name)).replace("_", "-");
2066 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2067 match lookup_abi(s) {
2068 Some(abi) => base.$key_name = Some(abi),
2069 _ => return Some(Err(format!("'{}' is not a valid value for abi", s))),
2072 })).unwrap_or(Ok(()))
2074 ($key_name:ident, TargetFamilies) => ( {
2075 if let Some(value) = obj.remove("target-family") {
2076 if let Some(v) = value.as_array() {
2077 base.$key_name = v.iter()
2078 .map(|a| a.as_str().unwrap().to_string().into())
2080 } else if let Some(v) = value.as_str() {
2081 base.$key_name = vec![v.to_string().into()].into();
2087 if let Some(j) = obj.remove("target-endian") {
2088 if let Some(s) = j.as_str() {
2089 base.endian = s.parse()?;
2091 incorrect_type.push("target-endian".into())
2095 if let Some(fp) = obj.remove("frame-pointer") {
2096 if let Some(s) = fp.as_str() {
2097 base.frame_pointer = s
2099 .map_err(|()| format!("'{}' is not a valid value for frame-pointer", s))?;
2101 incorrect_type.push("frame-pointer".into())
2105 key!(is_builtin, bool);
2106 key!(c_int_width = "target-c-int-width");
2111 key!(linker_flavor, LinkerFlavor)?;
2112 key!(linker, optional);
2113 key!(lld_flavor, LldFlavor)?;
2114 key!(pre_link_objects = "pre-link-objects", link_objects);
2115 key!(post_link_objects = "post-link-objects", link_objects);
2116 key!(pre_link_objects_self_contained = "pre-link-objects-fallback", link_objects);
2117 key!(post_link_objects_self_contained = "post-link-objects-fallback", link_objects);
2118 key!(link_self_contained = "crt-objects-fallback", link_self_contained)?;
2119 key!(pre_link_args, link_args);
2120 key!(late_link_args, link_args);
2121 key!(late_link_args_dynamic, link_args);
2122 key!(late_link_args_static, link_args);
2123 key!(post_link_args, link_args);
2124 key!(link_script, optional);
2125 key!(link_env, env);
2126 key!(link_env_remove, list);
2127 key!(asm_args, list);
2130 key!(dynamic_linking, bool);
2131 key!(only_cdylib, bool);
2132 key!(executables, bool);
2133 key!(relocation_model, RelocModel)?;
2134 key!(code_model, CodeModel)?;
2135 key!(tls_model, TlsModel)?;
2136 key!(disable_redzone, bool);
2137 key!(function_sections, bool);
2141 key!(staticlib_prefix);
2142 key!(staticlib_suffix);
2143 key!(families, TargetFamilies);
2144 key!(abi_return_struct_as_int, bool);
2145 key!(is_like_osx, bool);
2146 key!(is_like_solaris, bool);
2147 key!(is_like_windows, bool);
2148 key!(is_like_msvc, bool);
2149 key!(is_like_wasm, bool);
2150 key!(default_dwarf_version, u32);
2151 key!(linker_is_gnu, bool);
2152 key!(allows_weak_linkage, bool);
2153 key!(has_rpath, bool);
2154 key!(no_default_libraries, bool);
2155 key!(position_independent_executables, bool);
2156 key!(static_position_independent_executables, bool);
2157 key!(needs_plt, bool);
2158 key!(relro_level, RelroLevel)?;
2159 key!(archive_format);
2160 key!(allow_asm, bool);
2161 key!(main_needs_argc_argv, bool);
2162 key!(has_thread_local, bool);
2163 key!(obj_is_bitcode, bool);
2164 key!(forces_embed_bitcode, bool);
2165 key!(bitcode_llvm_cmdline);
2166 key!(max_atomic_width, Option<u64>);
2167 key!(min_atomic_width, Option<u64>);
2168 key!(atomic_cas, bool);
2169 key!(panic_strategy, PanicStrategy)?;
2170 key!(crt_static_allows_dylibs, bool);
2171 key!(crt_static_default, bool);
2172 key!(crt_static_respected, bool);
2173 key!(stack_probes, StackProbeType)?;
2174 key!(min_global_align, Option<u64>);
2175 key!(default_codegen_units, Option<u64>);
2176 key!(trap_unreachable, bool);
2177 key!(requires_lto, bool);
2178 key!(singlethread, bool);
2179 key!(no_builtins, bool);
2180 key!(default_hidden_visibility, bool);
2181 key!(emit_debug_gdb_scripts, bool);
2182 key!(requires_uwtable, bool);
2183 key!(default_uwtable, bool);
2184 key!(simd_types_indirect, bool);
2185 key!(limit_rdylib_exports, bool);
2186 key!(override_export_symbols, opt_list);
2187 key!(merge_functions, MergeFunctions)?;
2188 key!(mcount = "target-mcount");
2190 key!(relax_elf_relocations, bool);
2191 key!(llvm_args, list);
2192 key!(use_ctors_section, bool);
2193 key!(eh_frame_header, bool);
2194 key!(has_thumb_interworking, bool);
2195 key!(split_debuginfo, SplitDebuginfo)?;
2196 key!(supported_sanitizers, SanitizerSet)?;
2197 key!(default_adjusted_cabi, Option<Abi>)?;
2198 key!(c_enum_min_bits, u64);
2199 key!(generate_arange_section, bool);
2200 key!(supports_stack_protector, bool);
2202 if base.is_builtin {
2203 // This can cause unfortunate ICEs later down the line.
2204 return Err("may not set is_builtin for targets not built-in".into());
2206 // Each field should have been read using `Json::remove` so any keys remaining are unused.
2207 let remaining_keys = obj.keys();
2210 TargetWarnings { unused_fields: remaining_keys.cloned().collect(), incorrect_type },
2214 /// Load a built-in target
2215 pub fn expect_builtin(target_triple: &TargetTriple) -> Target {
2216 match *target_triple {
2217 TargetTriple::TargetTriple(ref target_triple) => {
2218 load_builtin(target_triple).expect("built-in target")
2220 TargetTriple::TargetJson { .. } => {
2221 panic!("built-in targets doens't support target-paths")
2226 /// Search for a JSON file specifying the given target triple.
2228 /// If none is found in `$RUST_TARGET_PATH`, look for a file called `target.json` inside the
2229 /// sysroot under the target-triple's `rustlib` directory. Note that it could also just be a
2230 /// bare filename already, so also check for that. If one of the hardcoded targets we know
2231 /// about, just return it directly.
2233 /// The error string could come from any of the APIs called, including filesystem access and
2236 target_triple: &TargetTriple,
2238 ) -> Result<(Target, TargetWarnings), String> {
2242 fn load_file(path: &Path) -> Result<(Target, TargetWarnings), String> {
2243 let contents = fs::read_to_string(path).map_err(|e| e.to_string())?;
2244 let obj = serde_json::from_str(&contents).map_err(|e| e.to_string())?;
2245 Target::from_json(obj)
2248 match *target_triple {
2249 TargetTriple::TargetTriple(ref target_triple) => {
2250 // check if triple is in list of built-in targets
2251 if let Some(t) = load_builtin(target_triple) {
2252 return Ok((t, TargetWarnings::empty()));
2255 // search for a file named `target_triple`.json in RUST_TARGET_PATH
2257 let mut target = target_triple.to_string();
2258 target.push_str(".json");
2259 PathBuf::from(target)
2262 let target_path = env::var_os("RUST_TARGET_PATH").unwrap_or_default();
2264 for dir in env::split_paths(&target_path) {
2265 let p = dir.join(&path);
2267 return load_file(&p);
2271 // Additionally look in the sysroot under `lib/rustlib/<triple>/target.json`
2273 let rustlib_path = crate::target_rustlib_path(&sysroot, &target_triple);
2274 let p = PathBuf::from_iter([
2276 Path::new(&rustlib_path),
2277 Path::new("target.json"),
2280 return load_file(&p);
2283 Err(format!("Could not find specification for target {:?}", target_triple))
2285 TargetTriple::TargetJson { ref contents, .. } => {
2286 let obj = serde_json::from_str(contents).map_err(|e| e.to_string())?;
2287 Target::from_json(obj)
2293 impl ToJson for Target {
2294 fn to_json(&self) -> Json {
2295 let mut d = serde_json::Map::new();
2296 let default: TargetOptions = Default::default();
2298 macro_rules! target_val {
2300 let name = (stringify!($attr)).replace("_", "-");
2301 d.insert(name, self.$attr.to_json());
2305 macro_rules! target_option_val {
2307 let name = (stringify!($attr)).replace("_", "-");
2308 if default.$attr != self.$attr {
2309 d.insert(name, self.$attr.to_json());
2312 ($attr:ident, $key_name:expr) => {{
2313 let name = $key_name;
2314 if default.$attr != self.$attr {
2315 d.insert(name.into(), self.$attr.to_json());
2318 (link_args - $attr:ident) => {{
2319 let name = (stringify!($attr)).replace("_", "-");
2320 if default.$attr != self.$attr {
2324 .map(|(k, v)| (k.desc().to_string(), v.clone()))
2325 .collect::<BTreeMap<_, _>>();
2326 d.insert(name, obj.to_json());
2329 (env - $attr:ident) => {{
2330 let name = (stringify!($attr)).replace("_", "-");
2331 if default.$attr != self.$attr {
2335 .map(|&(ref k, ref v)| format!("{k}={v}"))
2336 .collect::<Vec<_>>();
2337 d.insert(name, obj.to_json());
2342 target_val!(llvm_target);
2343 d.insert("target-pointer-width".to_string(), self.pointer_width.to_string().to_json());
2345 target_val!(data_layout);
2347 target_option_val!(is_builtin);
2348 target_option_val!(endian, "target-endian");
2349 target_option_val!(c_int_width, "target-c-int-width");
2350 target_option_val!(os);
2351 target_option_val!(env);
2352 target_option_val!(abi);
2353 target_option_val!(vendor);
2354 target_option_val!(linker_flavor);
2355 target_option_val!(linker);
2356 target_option_val!(lld_flavor);
2357 target_option_val!(pre_link_objects);
2358 target_option_val!(post_link_objects);
2359 target_option_val!(pre_link_objects_self_contained, "pre-link-objects-fallback");
2360 target_option_val!(post_link_objects_self_contained, "post-link-objects-fallback");
2361 target_option_val!(link_self_contained, "crt-objects-fallback");
2362 target_option_val!(link_args - pre_link_args);
2363 target_option_val!(link_args - late_link_args);
2364 target_option_val!(link_args - late_link_args_dynamic);
2365 target_option_val!(link_args - late_link_args_static);
2366 target_option_val!(link_args - post_link_args);
2367 target_option_val!(link_script);
2368 target_option_val!(env - link_env);
2369 target_option_val!(link_env_remove);
2370 target_option_val!(asm_args);
2371 target_option_val!(cpu);
2372 target_option_val!(features);
2373 target_option_val!(dynamic_linking);
2374 target_option_val!(only_cdylib);
2375 target_option_val!(executables);
2376 target_option_val!(relocation_model);
2377 target_option_val!(code_model);
2378 target_option_val!(tls_model);
2379 target_option_val!(disable_redzone);
2380 target_option_val!(frame_pointer);
2381 target_option_val!(function_sections);
2382 target_option_val!(dll_prefix);
2383 target_option_val!(dll_suffix);
2384 target_option_val!(exe_suffix);
2385 target_option_val!(staticlib_prefix);
2386 target_option_val!(staticlib_suffix);
2387 target_option_val!(families, "target-family");
2388 target_option_val!(abi_return_struct_as_int);
2389 target_option_val!(is_like_osx);
2390 target_option_val!(is_like_solaris);
2391 target_option_val!(is_like_windows);
2392 target_option_val!(is_like_msvc);
2393 target_option_val!(is_like_wasm);
2394 target_option_val!(default_dwarf_version);
2395 target_option_val!(linker_is_gnu);
2396 target_option_val!(allows_weak_linkage);
2397 target_option_val!(has_rpath);
2398 target_option_val!(no_default_libraries);
2399 target_option_val!(position_independent_executables);
2400 target_option_val!(static_position_independent_executables);
2401 target_option_val!(needs_plt);
2402 target_option_val!(relro_level);
2403 target_option_val!(archive_format);
2404 target_option_val!(allow_asm);
2405 target_option_val!(main_needs_argc_argv);
2406 target_option_val!(has_thread_local);
2407 target_option_val!(obj_is_bitcode);
2408 target_option_val!(forces_embed_bitcode);
2409 target_option_val!(bitcode_llvm_cmdline);
2410 target_option_val!(min_atomic_width);
2411 target_option_val!(max_atomic_width);
2412 target_option_val!(atomic_cas);
2413 target_option_val!(panic_strategy);
2414 target_option_val!(crt_static_allows_dylibs);
2415 target_option_val!(crt_static_default);
2416 target_option_val!(crt_static_respected);
2417 target_option_val!(stack_probes);
2418 target_option_val!(min_global_align);
2419 target_option_val!(default_codegen_units);
2420 target_option_val!(trap_unreachable);
2421 target_option_val!(requires_lto);
2422 target_option_val!(singlethread);
2423 target_option_val!(no_builtins);
2424 target_option_val!(default_hidden_visibility);
2425 target_option_val!(emit_debug_gdb_scripts);
2426 target_option_val!(requires_uwtable);
2427 target_option_val!(default_uwtable);
2428 target_option_val!(simd_types_indirect);
2429 target_option_val!(limit_rdylib_exports);
2430 target_option_val!(override_export_symbols);
2431 target_option_val!(merge_functions);
2432 target_option_val!(mcount, "target-mcount");
2433 target_option_val!(llvm_abiname);
2434 target_option_val!(relax_elf_relocations);
2435 target_option_val!(llvm_args);
2436 target_option_val!(use_ctors_section);
2437 target_option_val!(eh_frame_header);
2438 target_option_val!(has_thumb_interworking);
2439 target_option_val!(split_debuginfo);
2440 target_option_val!(supported_sanitizers);
2441 target_option_val!(c_enum_min_bits);
2442 target_option_val!(generate_arange_section);
2443 target_option_val!(supports_stack_protector);
2445 if let Some(abi) = self.default_adjusted_cabi {
2446 d.insert("default-adjusted-cabi".into(), Abi::name(abi).to_json());
2453 /// Either a target triple string or a path to a JSON file.
2454 #[derive(Clone, Debug)]
2455 pub enum TargetTriple {
2456 TargetTriple(String),
2458 /// Warning: This field may only be used by rustdoc. Using it anywhere else will lead to
2459 /// inconsistencies as it is discarded during serialization.
2460 path_for_rustdoc: PathBuf,
2466 // Use a manual implementation to ignore the path field
2467 impl PartialEq for TargetTriple {
2468 fn eq(&self, other: &Self) -> bool {
2469 match (self, other) {
2470 (Self::TargetTriple(l0), Self::TargetTriple(r0)) => l0 == r0,
2472 Self::TargetJson { path_for_rustdoc: _, triple: l_triple, contents: l_contents },
2473 Self::TargetJson { path_for_rustdoc: _, triple: r_triple, contents: r_contents },
2474 ) => l_triple == r_triple && l_contents == r_contents,
2480 // Use a manual implementation to ignore the path field
2481 impl Hash for TargetTriple {
2482 fn hash<H: Hasher>(&self, state: &mut H) -> () {
2484 TargetTriple::TargetTriple(triple) => {
2488 TargetTriple::TargetJson { path_for_rustdoc: _, triple, contents } => {
2491 contents.hash(state)
2497 // Use a manual implementation to prevent encoding the target json file path in the crate metadata
2498 impl<S: Encoder> Encodable<S> for TargetTriple {
2499 fn encode(&self, s: &mut S) {
2501 TargetTriple::TargetTriple(triple) => s.emit_enum_variant(0, |s| s.emit_str(triple)),
2502 TargetTriple::TargetJson { path_for_rustdoc: _, triple, contents } => s
2503 .emit_enum_variant(1, |s| {
2505 s.emit_str(contents)
2511 impl<D: Decoder> Decodable<D> for TargetTriple {
2512 fn decode(d: &mut D) -> Self {
2513 match d.read_usize() {
2514 0 => TargetTriple::TargetTriple(d.read_str().to_owned()),
2515 1 => TargetTriple::TargetJson {
2516 path_for_rustdoc: PathBuf::new(),
2517 triple: d.read_str().to_owned(),
2518 contents: d.read_str().to_owned(),
2521 panic!("invalid enum variant tag while decoding `TargetTriple`, expected 0..2");
2528 /// Creates a target triple from the passed target triple string.
2529 pub fn from_triple(triple: &str) -> Self {
2530 TargetTriple::TargetTriple(triple.into())
2533 /// Creates a target triple from the passed target path.
2534 pub fn from_path(path: &Path) -> Result<Self, io::Error> {
2535 let canonicalized_path = path.canonicalize()?;
2536 let contents = std::fs::read_to_string(&canonicalized_path).map_err(|err| {
2538 io::ErrorKind::InvalidInput,
2539 format!("target path {:?} is not a valid file: {}", canonicalized_path, err),
2542 let triple = canonicalized_path
2544 .expect("target path must not be empty")
2546 .expect("target path must be valid unicode")
2548 Ok(TargetTriple::TargetJson { path_for_rustdoc: canonicalized_path, triple, contents })
2551 /// Returns a string triple for this target.
2553 /// If this target is a path, the file name (without extension) is returned.
2554 pub fn triple(&self) -> &str {
2556 TargetTriple::TargetTriple(ref triple)
2557 | TargetTriple::TargetJson { ref triple, .. } => triple,
2561 /// Returns an extended string triple for this target.
2563 /// If this target is a path, a hash of the path is appended to the triple returned
2565 pub fn debug_triple(&self) -> String {
2566 use std::collections::hash_map::DefaultHasher;
2569 TargetTriple::TargetTriple(triple) => triple.to_owned(),
2570 TargetTriple::TargetJson { path_for_rustdoc: _, triple, contents: content } => {
2571 let mut hasher = DefaultHasher::new();
2572 content.hash(&mut hasher);
2573 let hash = hasher.finish();
2574 format!("{}-{}", triple, hash)
2580 impl fmt::Display for TargetTriple {
2581 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2582 write!(f, "{}", self.debug_triple())