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::call::Conv;
38 use crate::abi::Endian;
39 use crate::json::{Json, ToJson};
40 use crate::spec::abi::{lookup as lookup_abi, Abi};
41 use crate::spec::crt_objects::{CrtObjects, LinkSelfContainedDefault};
42 use rustc_data_structures::stable_hasher::{HashStable, StableHasher};
43 use rustc_serialize::{Decodable, Decoder, Encodable, Encoder};
44 use rustc_span::symbol::{sym, Symbol};
45 use serde_json::Value;
47 use std::collections::BTreeMap;
48 use std::convert::TryFrom;
49 use std::hash::{Hash, Hasher};
50 use std::iter::FromIterator;
51 use std::ops::{Deref, DerefMut};
52 use std::path::{Path, PathBuf};
53 use std::str::FromStr;
56 use rustc_macros::HashStable_Generic;
75 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 /// Linker is called through a C/C++ compiler.
94 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
101 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
107 /// All linkers have some kinds of command line interfaces and rustc needs to know which commands
108 /// to use with each of them. So we cluster all such interfaces into a (somewhat arbitrary) number
109 /// of classes that we call "linker flavors".
111 /// Technically, it's not even necessary, we can nearly always infer the flavor from linker name
112 /// and target properties like `is_like_windows`/`is_like_osx`/etc. However, the PRs originally
113 /// introducing `-Clinker-flavor` (#40018 and friends) were aiming to reduce this kind of inference
114 /// and provide something certain and explicitly specified instead, and that design goal is still
117 /// The second goal is to keep the number of flavors to the minimum if possible.
118 /// LLD somewhat forces our hand here because that linker is self-sufficient only if its executable
119 /// (`argv[0]`) is named in specific way, otherwise it doesn't work and requires a
120 /// `-flavor LLD_FLAVOR` argument to choose which logic to use. Our shipped `rust-lld` in
121 /// particular is not named in such specific way, so it needs the flavor option, so we make our
122 /// linker flavors sufficiently fine-grained to satisfy LLD without inferring its flavor from other
123 /// target properties, in accordance with the first design goal.
125 /// The first component of the flavor is tightly coupled with the compilation target,
126 /// while the `Cc` and `Lld` flags can vary withing the same target.
127 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
128 pub enum LinkerFlavor {
129 /// Unix-like linker with GNU extensions (both naked and compiler-wrapped forms).
130 /// Besides similar "default" Linux/BSD linkers this also includes Windows/GNU linker,
131 /// which is somewhat different because it doesn't produce ELFs.
133 /// Unix-like linker for Apple targets (both naked and compiler-wrapped forms).
134 /// Extracted from the "umbrella" `Unix` flavor due to its corresponding LLD flavor.
136 /// Unix-like linker for Wasm targets (both naked and compiler-wrapped forms).
137 /// Extracted from the "umbrella" `Unix` flavor due to its corresponding LLD flavor.
138 /// Non-LLD version does not exist, so the lld flag is currently hardcoded here.
140 /// Basic Unix-like linker for "any other Unix" targets (Solaris/illumos, L4Re, MSP430, etc),
141 /// possibly with non-GNU extensions (both naked and compiler-wrapped forms).
142 /// LLD doesn't support any of these.
144 /// MSVC-style linker for Windows and UEFI, LLD supports it.
146 /// Emscripten Compiler Frontend, a wrapper around `WasmLld(Cc::Yes)` that has a different
147 /// interface and produces some additional JavaScript output.
149 // Below: other linker-like tools with unique interfaces for exotic targets.
150 /// Linker tool for BPF.
152 /// Linker tool for Nvidia PTX.
156 /// Linker flavors available externally through command line (`-Clinker-flavor`)
157 /// or json target specifications.
158 /// FIXME: This set has accumulated historically, bring it more in line with the internal
159 /// linker flavors (`LinkerFlavor`).
160 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
161 pub enum LinkerFlavorCli {
171 #[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd)]
180 pub fn as_str(&self) -> &'static str {
182 LldFlavor::Wasm => "wasm",
183 LldFlavor::Ld64 => "darwin",
184 LldFlavor::Ld => "gnu",
185 LldFlavor::Link => "link",
189 fn from_str(s: &str) -> Option<Self> {
191 "darwin" => LldFlavor::Ld64,
192 "gnu" => LldFlavor::Ld,
193 "link" => LldFlavor::Link,
194 "wasm" => LldFlavor::Wasm,
200 impl ToJson for LldFlavor {
201 fn to_json(&self) -> Json {
202 self.as_str().to_json()
207 pub fn from_cli(cli: LinkerFlavorCli, target: &TargetOptions) -> LinkerFlavor {
208 Self::from_cli_impl(cli, target.linker_flavor.lld_flavor(), target.linker_flavor.is_gnu())
211 /// The passed CLI flavor is preferred over other args coming from the default target spec,
212 /// so this function can produce a flavor that is incompatible with the current target.
213 /// FIXME: Produce errors when `-Clinker-flavor` is set to something incompatible
214 /// with the current target.
215 fn from_cli_impl(cli: LinkerFlavorCli, lld_flavor: LldFlavor, is_gnu: bool) -> LinkerFlavor {
217 LinkerFlavorCli::Gcc => match lld_flavor {
218 LldFlavor::Ld if is_gnu => LinkerFlavor::Gnu(Cc::Yes, Lld::No),
219 LldFlavor::Ld64 => LinkerFlavor::Darwin(Cc::Yes, Lld::No),
220 LldFlavor::Wasm => LinkerFlavor::WasmLld(Cc::Yes),
221 LldFlavor::Ld | LldFlavor::Link => LinkerFlavor::Unix(Cc::Yes),
223 LinkerFlavorCli::Ld => match lld_flavor {
224 LldFlavor::Ld if is_gnu => LinkerFlavor::Gnu(Cc::No, Lld::No),
225 LldFlavor::Ld64 => LinkerFlavor::Darwin(Cc::No, Lld::No),
226 LldFlavor::Ld | LldFlavor::Wasm | LldFlavor::Link => LinkerFlavor::Unix(Cc::No),
228 LinkerFlavorCli::Lld(LldFlavor::Ld) => LinkerFlavor::Gnu(Cc::No, Lld::Yes),
229 LinkerFlavorCli::Lld(LldFlavor::Ld64) => LinkerFlavor::Darwin(Cc::No, Lld::Yes),
230 LinkerFlavorCli::Lld(LldFlavor::Wasm) => LinkerFlavor::WasmLld(Cc::No),
231 LinkerFlavorCli::Lld(LldFlavor::Link) => LinkerFlavor::Msvc(Lld::Yes),
232 LinkerFlavorCli::Msvc => LinkerFlavor::Msvc(Lld::No),
233 LinkerFlavorCli::Em => LinkerFlavor::EmCc,
234 LinkerFlavorCli::BpfLinker => LinkerFlavor::Bpf,
235 LinkerFlavorCli::PtxLinker => LinkerFlavor::Ptx,
239 fn to_cli(self) -> LinkerFlavorCli {
241 LinkerFlavor::Gnu(Cc::Yes, _)
242 | LinkerFlavor::Darwin(Cc::Yes, _)
243 | LinkerFlavor::WasmLld(Cc::Yes)
244 | LinkerFlavor::Unix(Cc::Yes) => LinkerFlavorCli::Gcc,
245 LinkerFlavor::Gnu(_, Lld::Yes) => LinkerFlavorCli::Lld(LldFlavor::Ld),
246 LinkerFlavor::Darwin(_, Lld::Yes) => LinkerFlavorCli::Lld(LldFlavor::Ld64),
247 LinkerFlavor::WasmLld(..) => LinkerFlavorCli::Lld(LldFlavor::Wasm),
248 LinkerFlavor::Gnu(..) | LinkerFlavor::Darwin(..) | LinkerFlavor::Unix(..) => {
251 LinkerFlavor::Msvc(Lld::Yes) => LinkerFlavorCli::Lld(LldFlavor::Link),
252 LinkerFlavor::Msvc(..) => LinkerFlavorCli::Msvc,
253 LinkerFlavor::EmCc => LinkerFlavorCli::Em,
254 LinkerFlavor::Bpf => LinkerFlavorCli::BpfLinker,
255 LinkerFlavor::Ptx => LinkerFlavorCli::PtxLinker,
259 pub fn lld_flavor(self) -> LldFlavor {
261 LinkerFlavor::Gnu(..)
262 | LinkerFlavor::Unix(..)
265 | LinkerFlavor::Ptx => LldFlavor::Ld,
266 LinkerFlavor::Darwin(..) => LldFlavor::Ld64,
267 LinkerFlavor::WasmLld(..) => LldFlavor::Wasm,
268 LinkerFlavor::Msvc(..) => LldFlavor::Link,
272 pub fn is_gnu(self) -> bool {
273 matches!(self, LinkerFlavor::Gnu(..))
277 macro_rules! linker_flavor_cli_impls {
278 ($(($($flavor:tt)*) $string:literal)*) => (
279 impl LinkerFlavorCli {
280 pub const fn one_of() -> &'static str {
281 concat!("one of: ", $($string, " ",)*)
284 pub fn from_str(s: &str) -> Option<LinkerFlavorCli> {
286 $($string => $($flavor)*,)*
291 pub fn desc(&self) -> &str {
293 $($($flavor)* => $string,)*
300 linker_flavor_cli_impls! {
301 (LinkerFlavorCli::Gcc) "gcc"
302 (LinkerFlavorCli::Ld) "ld"
303 (LinkerFlavorCli::Lld(LldFlavor::Ld)) "ld.lld"
304 (LinkerFlavorCli::Lld(LldFlavor::Ld64)) "ld64.lld"
305 (LinkerFlavorCli::Lld(LldFlavor::Link)) "lld-link"
306 (LinkerFlavorCli::Lld(LldFlavor::Wasm)) "wasm-ld"
307 (LinkerFlavorCli::Msvc) "msvc"
308 (LinkerFlavorCli::Em) "em"
309 (LinkerFlavorCli::BpfLinker) "bpf-linker"
310 (LinkerFlavorCli::PtxLinker) "ptx-linker"
313 impl ToJson for LinkerFlavorCli {
314 fn to_json(&self) -> Json {
315 self.desc().to_json()
319 #[derive(Clone, Copy, Debug, PartialEq, Hash, Encodable, Decodable, HashStable_Generic)]
320 pub enum PanicStrategy {
326 pub fn desc(&self) -> &str {
328 PanicStrategy::Unwind => "unwind",
329 PanicStrategy::Abort => "abort",
333 pub const fn desc_symbol(&self) -> Symbol {
335 PanicStrategy::Unwind => sym::unwind,
336 PanicStrategy::Abort => sym::abort,
340 pub const fn all() -> [Symbol; 2] {
341 [Self::Abort.desc_symbol(), Self::Unwind.desc_symbol()]
345 impl ToJson for PanicStrategy {
346 fn to_json(&self) -> Json {
348 PanicStrategy::Abort => "abort".to_json(),
349 PanicStrategy::Unwind => "unwind".to_json(),
354 #[derive(Clone, Copy, Debug, PartialEq, Hash)]
355 pub enum RelroLevel {
363 pub fn desc(&self) -> &str {
365 RelroLevel::Full => "full",
366 RelroLevel::Partial => "partial",
367 RelroLevel::Off => "off",
368 RelroLevel::None => "none",
373 impl FromStr for RelroLevel {
376 fn from_str(s: &str) -> Result<RelroLevel, ()> {
378 "full" => Ok(RelroLevel::Full),
379 "partial" => Ok(RelroLevel::Partial),
380 "off" => Ok(RelroLevel::Off),
381 "none" => Ok(RelroLevel::None),
387 impl ToJson for RelroLevel {
388 fn to_json(&self) -> Json {
390 RelroLevel::Full => "full".to_json(),
391 RelroLevel::Partial => "partial".to_json(),
392 RelroLevel::Off => "off".to_json(),
393 RelroLevel::None => "None".to_json(),
398 #[derive(Clone, Copy, Debug, PartialEq, Hash)]
399 pub enum MergeFunctions {
405 impl MergeFunctions {
406 pub fn desc(&self) -> &str {
408 MergeFunctions::Disabled => "disabled",
409 MergeFunctions::Trampolines => "trampolines",
410 MergeFunctions::Aliases => "aliases",
415 impl FromStr for MergeFunctions {
418 fn from_str(s: &str) -> Result<MergeFunctions, ()> {
420 "disabled" => Ok(MergeFunctions::Disabled),
421 "trampolines" => Ok(MergeFunctions::Trampolines),
422 "aliases" => Ok(MergeFunctions::Aliases),
428 impl ToJson for MergeFunctions {
429 fn to_json(&self) -> Json {
431 MergeFunctions::Disabled => "disabled".to_json(),
432 MergeFunctions::Trampolines => "trampolines".to_json(),
433 MergeFunctions::Aliases => "aliases".to_json(),
438 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
439 pub enum RelocModel {
449 impl FromStr for RelocModel {
452 fn from_str(s: &str) -> Result<RelocModel, ()> {
454 "static" => RelocModel::Static,
455 "pic" => RelocModel::Pic,
456 "pie" => RelocModel::Pie,
457 "dynamic-no-pic" => RelocModel::DynamicNoPic,
458 "ropi" => RelocModel::Ropi,
459 "rwpi" => RelocModel::Rwpi,
460 "ropi-rwpi" => RelocModel::RopiRwpi,
466 impl ToJson for RelocModel {
467 fn to_json(&self) -> Json {
469 RelocModel::Static => "static",
470 RelocModel::Pic => "pic",
471 RelocModel::Pie => "pie",
472 RelocModel::DynamicNoPic => "dynamic-no-pic",
473 RelocModel::Ropi => "ropi",
474 RelocModel::Rwpi => "rwpi",
475 RelocModel::RopiRwpi => "ropi-rwpi",
481 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
490 impl FromStr for CodeModel {
493 fn from_str(s: &str) -> Result<CodeModel, ()> {
495 "tiny" => CodeModel::Tiny,
496 "small" => CodeModel::Small,
497 "kernel" => CodeModel::Kernel,
498 "medium" => CodeModel::Medium,
499 "large" => CodeModel::Large,
505 impl ToJson for CodeModel {
506 fn to_json(&self) -> Json {
508 CodeModel::Tiny => "tiny",
509 CodeModel::Small => "small",
510 CodeModel::Kernel => "kernel",
511 CodeModel::Medium => "medium",
512 CodeModel::Large => "large",
518 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
526 impl FromStr for TlsModel {
529 fn from_str(s: &str) -> Result<TlsModel, ()> {
531 // Note the difference "general" vs "global" difference. The model name is "general",
532 // but the user-facing option name is "global" for consistency with other compilers.
533 "global-dynamic" => TlsModel::GeneralDynamic,
534 "local-dynamic" => TlsModel::LocalDynamic,
535 "initial-exec" => TlsModel::InitialExec,
536 "local-exec" => TlsModel::LocalExec,
542 impl ToJson for TlsModel {
543 fn to_json(&self) -> Json {
545 TlsModel::GeneralDynamic => "global-dynamic",
546 TlsModel::LocalDynamic => "local-dynamic",
547 TlsModel::InitialExec => "initial-exec",
548 TlsModel::LocalExec => "local-exec",
554 /// Everything is flattened to a single enum to make the json encoding/decoding less annoying.
555 #[derive(Clone, Copy, PartialEq, Eq, PartialOrd, Ord, Debug)]
556 pub enum LinkOutputKind {
557 /// Dynamically linked non position-independent executable.
559 /// Dynamically linked position-independent executable.
561 /// Statically linked non position-independent executable.
563 /// Statically linked position-independent executable.
565 /// Regular dynamic library ("dynamically linked").
567 /// Dynamic library with bundled libc ("statically linked").
569 /// WASI module with a lifetime past the _initialize entry point
573 impl LinkOutputKind {
574 fn as_str(&self) -> &'static str {
576 LinkOutputKind::DynamicNoPicExe => "dynamic-nopic-exe",
577 LinkOutputKind::DynamicPicExe => "dynamic-pic-exe",
578 LinkOutputKind::StaticNoPicExe => "static-nopic-exe",
579 LinkOutputKind::StaticPicExe => "static-pic-exe",
580 LinkOutputKind::DynamicDylib => "dynamic-dylib",
581 LinkOutputKind::StaticDylib => "static-dylib",
582 LinkOutputKind::WasiReactorExe => "wasi-reactor-exe",
586 pub(super) fn from_str(s: &str) -> Option<LinkOutputKind> {
588 "dynamic-nopic-exe" => LinkOutputKind::DynamicNoPicExe,
589 "dynamic-pic-exe" => LinkOutputKind::DynamicPicExe,
590 "static-nopic-exe" => LinkOutputKind::StaticNoPicExe,
591 "static-pic-exe" => LinkOutputKind::StaticPicExe,
592 "dynamic-dylib" => LinkOutputKind::DynamicDylib,
593 "static-dylib" => LinkOutputKind::StaticDylib,
594 "wasi-reactor-exe" => LinkOutputKind::WasiReactorExe,
600 impl fmt::Display for LinkOutputKind {
601 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
602 f.write_str(self.as_str())
606 pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<StaticCow<str>>>;
607 pub type LinkArgsCli = BTreeMap<LinkerFlavorCli, Vec<StaticCow<str>>>;
609 /// Which kind of debuginfo does the target use?
611 /// Useful in determining whether a target supports Split DWARF (a target with
612 /// `DebuginfoKind::Dwarf` and supporting `SplitDebuginfo::Unpacked` for example).
613 #[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
614 pub enum DebuginfoKind {
615 /// DWARF debuginfo (such as that used on `x86_64_unknown_linux_gnu`).
618 /// DWARF debuginfo in dSYM files (such as on Apple platforms).
620 /// Program database files (such as on Windows).
625 fn as_str(&self) -> &'static str {
627 DebuginfoKind::Dwarf => "dwarf",
628 DebuginfoKind::DwarfDsym => "dwarf-dsym",
629 DebuginfoKind::Pdb => "pdb",
634 impl FromStr for DebuginfoKind {
637 fn from_str(s: &str) -> Result<Self, ()> {
639 "dwarf" => DebuginfoKind::Dwarf,
640 "dwarf-dsym" => DebuginfoKind::DwarfDsym,
641 "pdb" => DebuginfoKind::Pdb,
647 impl ToJson for DebuginfoKind {
648 fn to_json(&self) -> Json {
649 self.as_str().to_json()
653 impl fmt::Display for DebuginfoKind {
654 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
655 f.write_str(self.as_str())
659 #[derive(Clone, Copy, Debug, Default, Eq, Hash, PartialEq)]
660 pub enum SplitDebuginfo {
661 /// Split debug-information is disabled, meaning that on supported platforms
662 /// you can find all debug information in the executable itself. This is
663 /// only supported for ELF effectively.
665 /// * Windows - not supported
666 /// * macOS - don't run `dsymutil`
667 /// * ELF - `.debug_*` sections
671 /// Split debug-information can be found in a "packed" location separate
672 /// from the final artifact. This is supported on all platforms.
674 /// * Windows - `*.pdb`
675 /// * macOS - `*.dSYM` (run `dsymutil`)
676 /// * ELF - `*.dwp` (run `thorin`)
679 /// Split debug-information can be found in individual object files on the
680 /// filesystem. The main executable may point to the object files.
682 /// * Windows - not supported
683 /// * macOS - supported, scattered object files
684 /// * ELF - supported, scattered `*.dwo` or `*.o` files (see `SplitDwarfKind`)
688 impl SplitDebuginfo {
689 fn as_str(&self) -> &'static str {
691 SplitDebuginfo::Off => "off",
692 SplitDebuginfo::Packed => "packed",
693 SplitDebuginfo::Unpacked => "unpacked",
698 impl FromStr for SplitDebuginfo {
701 fn from_str(s: &str) -> Result<Self, ()> {
703 "off" => SplitDebuginfo::Off,
704 "unpacked" => SplitDebuginfo::Unpacked,
705 "packed" => SplitDebuginfo::Packed,
711 impl ToJson for SplitDebuginfo {
712 fn to_json(&self) -> Json {
713 self.as_str().to_json()
717 impl fmt::Display for SplitDebuginfo {
718 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
719 f.write_str(self.as_str())
723 #[derive(Clone, Debug, PartialEq, Eq)]
724 pub enum StackProbeType {
725 /// Don't emit any stack probes.
727 /// It is harmless to use this option even on targets that do not have backend support for
728 /// stack probes as the failure mode is the same as if no stack-probe option was specified in
731 /// Call `__rust_probestack` whenever stack needs to be probed.
733 /// Use inline option for LLVM versions later than specified in `min_llvm_version_for_inline`
734 /// and call `__rust_probestack` otherwise.
735 InlineOrCall { min_llvm_version_for_inline: (u32, u32, u32) },
738 impl StackProbeType {
739 // LLVM X86 targets (ix86 and x86_64) can use inline-asm stack probes starting with LLVM 16.
740 // Notable past issues were rust#83139 (fixed in 14) and rust#84667 (fixed in 16).
741 const X86: Self = Self::InlineOrCall { min_llvm_version_for_inline: (16, 0, 0) };
743 fn from_json(json: &Json) -> Result<Self, String> {
744 let object = json.as_object().ok_or_else(|| "expected a JSON object")?;
747 .and_then(|o| o.as_str())
748 .ok_or_else(|| "expected `kind` to be a string")?;
750 "none" => Ok(StackProbeType::None),
751 "inline" => Ok(StackProbeType::Inline),
752 "call" => Ok(StackProbeType::Call),
753 "inline-or-call" => {
754 let min_version = object
755 .get("min-llvm-version-for-inline")
756 .and_then(|o| o.as_array())
757 .ok_or_else(|| "expected `min-llvm-version-for-inline` to be an array")?;
758 let mut iter = min_version.into_iter().map(|v| {
759 let int = v.as_u64().ok_or_else(
760 || "expected `min-llvm-version-for-inline` values to be integers",
763 .map_err(|_| "`min-llvm-version-for-inline` values don't convert to u32")
765 let min_llvm_version_for_inline = (
766 iter.next().unwrap_or(Ok(11))?,
767 iter.next().unwrap_or(Ok(0))?,
768 iter.next().unwrap_or(Ok(0))?,
770 Ok(StackProbeType::InlineOrCall { min_llvm_version_for_inline })
772 _ => Err(String::from(
773 "`kind` expected to be one of `none`, `inline`, `call` or `inline-or-call`",
779 impl ToJson for StackProbeType {
780 fn to_json(&self) -> Json {
781 Json::Object(match self {
782 StackProbeType::None => {
783 [(String::from("kind"), "none".to_json())].into_iter().collect()
785 StackProbeType::Inline => {
786 [(String::from("kind"), "inline".to_json())].into_iter().collect()
788 StackProbeType::Call => {
789 [(String::from("kind"), "call".to_json())].into_iter().collect()
791 StackProbeType::InlineOrCall { min_llvm_version_for_inline: (maj, min, patch) } => [
792 (String::from("kind"), "inline-or-call".to_json()),
794 String::from("min-llvm-version-for-inline"),
795 Json::Array(vec![maj.to_json(), min.to_json(), patch.to_json()]),
804 bitflags::bitflags! {
805 #[derive(Default, Encodable, Decodable)]
806 pub struct SanitizerSet: u8 {
807 const ADDRESS = 1 << 0;
809 const MEMORY = 1 << 2;
810 const THREAD = 1 << 3;
811 const HWADDRESS = 1 << 4;
813 const MEMTAG = 1 << 6;
814 const SHADOWCALLSTACK = 1 << 7;
819 /// Return sanitizer's name
821 /// Returns none if the flags is a set of sanitizers numbering not exactly one.
822 pub fn as_str(self) -> Option<&'static str> {
824 SanitizerSet::ADDRESS => "address",
825 SanitizerSet::CFI => "cfi",
826 SanitizerSet::LEAK => "leak",
827 SanitizerSet::MEMORY => "memory",
828 SanitizerSet::MEMTAG => "memtag",
829 SanitizerSet::SHADOWCALLSTACK => "shadow-call-stack",
830 SanitizerSet::THREAD => "thread",
831 SanitizerSet::HWADDRESS => "hwaddress",
837 /// Formats a sanitizer set as a comma separated list of sanitizers' names.
838 impl fmt::Display for SanitizerSet {
839 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
840 let mut first = true;
842 let name = s.as_str().unwrap_or_else(|| panic!("unrecognized sanitizer {:?}", s));
853 impl IntoIterator for SanitizerSet {
854 type Item = SanitizerSet;
855 type IntoIter = std::vec::IntoIter<SanitizerSet>;
857 fn into_iter(self) -> Self::IntoIter {
859 SanitizerSet::ADDRESS,
862 SanitizerSet::MEMORY,
863 SanitizerSet::MEMTAG,
864 SanitizerSet::SHADOWCALLSTACK,
865 SanitizerSet::THREAD,
866 SanitizerSet::HWADDRESS,
870 .filter(|&s| self.contains(s))
876 impl<CTX> HashStable<CTX> for SanitizerSet {
877 fn hash_stable(&self, ctx: &mut CTX, hasher: &mut StableHasher) {
878 self.bits().hash_stable(ctx, hasher);
882 impl ToJson for SanitizerSet {
883 fn to_json(&self) -> Json {
885 .map(|v| Some(v.as_str()?.to_json()))
886 .collect::<Option<Vec<_>>>()
892 #[derive(Clone, Copy, PartialEq, Hash, Debug)]
893 pub enum FramePointer {
894 /// Forces the machine code generator to always preserve the frame pointers.
896 /// Forces the machine code generator to preserve the frame pointers except for the leaf
897 /// functions (i.e. those that don't call other functions).
899 /// Allows the machine code generator to omit the frame pointers.
901 /// This option does not guarantee that the frame pointers will be omitted.
905 impl FromStr for FramePointer {
907 fn from_str(s: &str) -> Result<Self, ()> {
909 "always" => Self::Always,
910 "non-leaf" => Self::NonLeaf,
911 "may-omit" => Self::MayOmit,
917 impl ToJson for FramePointer {
918 fn to_json(&self) -> Json {
920 Self::Always => "always",
921 Self::NonLeaf => "non-leaf",
922 Self::MayOmit => "may-omit",
928 /// Controls use of stack canaries.
929 #[derive(Clone, Copy, Debug, PartialEq, Hash, Eq)]
930 pub enum StackProtector {
931 /// Disable stack canary generation.
934 /// On LLVM, mark all generated LLVM functions with the `ssp` attribute (see
935 /// llvm/docs/LangRef.rst). This triggers stack canary generation in
936 /// functions which contain an array of a byte-sized type with more than
940 /// On LLVM, mark all generated LLVM functions with the `sspstrong`
941 /// attribute (see llvm/docs/LangRef.rst). This triggers stack canary
942 /// generation in functions which either contain an array, or which take
943 /// the address of a local variable.
946 /// Generate stack canaries in all functions.
950 impl StackProtector {
951 fn as_str(&self) -> &'static str {
953 StackProtector::None => "none",
954 StackProtector::Basic => "basic",
955 StackProtector::Strong => "strong",
956 StackProtector::All => "all",
961 impl FromStr for StackProtector {
964 fn from_str(s: &str) -> Result<StackProtector, ()> {
966 "none" => StackProtector::None,
967 "basic" => StackProtector::Basic,
968 "strong" => StackProtector::Strong,
969 "all" => StackProtector::All,
975 impl fmt::Display for StackProtector {
976 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
977 f.write_str(self.as_str())
981 macro_rules! supported_targets {
982 ( $(($triple:literal, $module:ident ),)+ ) => {
985 /// List of supported targets
986 pub const TARGETS: &[&str] = &[$($triple),+];
988 fn load_builtin(target: &str) -> Option<Target> {
989 let mut t = match target {
990 $( $triple => $module::target(), )+
994 debug!("got builtin target: {:?}", t);
1002 // Cannot put this into a separate file without duplication, make an exception.
1004 #[test] // `#[test]`
1006 tests_impl::test_target(super::$module::target());
1013 supported_targets! {
1014 ("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
1015 ("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
1016 ("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
1017 ("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
1018 ("m68k-unknown-linux-gnu", m68k_unknown_linux_gnu),
1019 ("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
1020 ("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
1021 ("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
1022 ("mipsisa32r6-unknown-linux-gnu", mipsisa32r6_unknown_linux_gnu),
1023 ("mipsisa32r6el-unknown-linux-gnu", mipsisa32r6el_unknown_linux_gnu),
1024 ("mipsisa64r6-unknown-linux-gnuabi64", mipsisa64r6_unknown_linux_gnuabi64),
1025 ("mipsisa64r6el-unknown-linux-gnuabi64", mipsisa64r6el_unknown_linux_gnuabi64),
1026 ("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
1027 ("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
1028 ("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
1029 ("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
1030 ("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
1031 ("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
1032 ("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
1033 ("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
1034 ("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
1035 ("s390x-unknown-linux-musl", s390x_unknown_linux_musl),
1036 ("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
1037 ("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
1038 ("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
1039 ("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
1040 ("armeb-unknown-linux-gnueabi", armeb_unknown_linux_gnueabi),
1041 ("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
1042 ("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
1043 ("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
1044 ("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
1045 ("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
1046 ("armv5te-unknown-linux-uclibceabi", armv5te_unknown_linux_uclibceabi),
1047 ("armv7-unknown-linux-gnueabi", armv7_unknown_linux_gnueabi),
1048 ("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
1049 ("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
1050 ("thumbv7neon-unknown-linux-musleabihf", thumbv7neon_unknown_linux_musleabihf),
1051 ("armv7-unknown-linux-musleabi", armv7_unknown_linux_musleabi),
1052 ("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
1053 ("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
1054 ("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
1055 ("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
1056 ("i686-unknown-linux-musl", i686_unknown_linux_musl),
1057 ("i586-unknown-linux-musl", i586_unknown_linux_musl),
1058 ("mips-unknown-linux-musl", mips_unknown_linux_musl),
1059 ("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
1060 ("mips64-unknown-linux-muslabi64", mips64_unknown_linux_muslabi64),
1061 ("mips64el-unknown-linux-muslabi64", mips64el_unknown_linux_muslabi64),
1062 ("hexagon-unknown-linux-musl", hexagon_unknown_linux_musl),
1064 ("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
1065 ("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
1067 ("i686-linux-android", i686_linux_android),
1068 ("x86_64-linux-android", x86_64_linux_android),
1069 ("arm-linux-androideabi", arm_linux_androideabi),
1070 ("armv7-linux-androideabi", armv7_linux_androideabi),
1071 ("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
1072 ("aarch64-linux-android", aarch64_linux_android),
1074 ("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
1075 ("armv6-unknown-freebsd", armv6_unknown_freebsd),
1076 ("armv7-unknown-freebsd", armv7_unknown_freebsd),
1077 ("i686-unknown-freebsd", i686_unknown_freebsd),
1078 ("powerpc-unknown-freebsd", powerpc_unknown_freebsd),
1079 ("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
1080 ("powerpc64le-unknown-freebsd", powerpc64le_unknown_freebsd),
1081 ("riscv64gc-unknown-freebsd", riscv64gc_unknown_freebsd),
1082 ("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
1084 ("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
1086 ("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
1087 ("i686-unknown-openbsd", i686_unknown_openbsd),
1088 ("powerpc-unknown-openbsd", powerpc_unknown_openbsd),
1089 ("powerpc64-unknown-openbsd", powerpc64_unknown_openbsd),
1090 ("riscv64gc-unknown-openbsd", riscv64gc_unknown_openbsd),
1091 ("sparc64-unknown-openbsd", sparc64_unknown_openbsd),
1092 ("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
1094 ("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
1095 ("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
1096 ("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
1097 ("i686-unknown-netbsd", i686_unknown_netbsd),
1098 ("powerpc-unknown-netbsd", powerpc_unknown_netbsd),
1099 ("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
1100 ("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
1102 ("i686-unknown-haiku", i686_unknown_haiku),
1103 ("x86_64-unknown-haiku", x86_64_unknown_haiku),
1105 ("aarch64-apple-darwin", aarch64_apple_darwin),
1106 ("x86_64-apple-darwin", x86_64_apple_darwin),
1107 ("i686-apple-darwin", i686_apple_darwin),
1109 ("aarch64-fuchsia", aarch64_fuchsia),
1110 ("x86_64-fuchsia", x86_64_fuchsia),
1112 ("avr-unknown-gnu-atmega328", avr_unknown_gnu_atmega328),
1114 ("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
1116 ("aarch64-unknown-redox", aarch64_unknown_redox),
1117 ("x86_64-unknown-redox", x86_64_unknown_redox),
1119 ("i386-apple-ios", i386_apple_ios),
1120 ("x86_64-apple-ios", x86_64_apple_ios),
1121 ("aarch64-apple-ios", aarch64_apple_ios),
1122 ("armv7-apple-ios", armv7_apple_ios),
1123 ("armv7s-apple-ios", armv7s_apple_ios),
1124 ("x86_64-apple-ios-macabi", x86_64_apple_ios_macabi),
1125 ("aarch64-apple-ios-macabi", aarch64_apple_ios_macabi),
1126 ("aarch64-apple-ios-sim", aarch64_apple_ios_sim),
1127 ("aarch64-apple-tvos", aarch64_apple_tvos),
1128 ("x86_64-apple-tvos", x86_64_apple_tvos),
1130 ("armv7k-apple-watchos", armv7k_apple_watchos),
1131 ("arm64_32-apple-watchos", arm64_32_apple_watchos),
1132 ("x86_64-apple-watchos-sim", x86_64_apple_watchos_sim),
1133 ("aarch64-apple-watchos-sim", aarch64_apple_watchos_sim),
1135 ("armebv7r-none-eabi", armebv7r_none_eabi),
1136 ("armebv7r-none-eabihf", armebv7r_none_eabihf),
1137 ("armv7r-none-eabi", armv7r_none_eabi),
1138 ("armv7r-none-eabihf", armv7r_none_eabihf),
1140 ("x86_64-pc-solaris", x86_64_pc_solaris),
1141 ("x86_64-sun-solaris", x86_64_sun_solaris),
1142 ("sparcv9-sun-solaris", sparcv9_sun_solaris),
1144 ("x86_64-unknown-illumos", x86_64_unknown_illumos),
1146 ("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
1147 ("i686-pc-windows-gnu", i686_pc_windows_gnu),
1148 ("i686-uwp-windows-gnu", i686_uwp_windows_gnu),
1149 ("x86_64-uwp-windows-gnu", x86_64_uwp_windows_gnu),
1151 ("aarch64-pc-windows-gnullvm", aarch64_pc_windows_gnullvm),
1152 ("x86_64-pc-windows-gnullvm", x86_64_pc_windows_gnullvm),
1154 ("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
1155 ("aarch64-uwp-windows-msvc", aarch64_uwp_windows_msvc),
1156 ("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
1157 ("x86_64-uwp-windows-msvc", x86_64_uwp_windows_msvc),
1158 ("i686-pc-windows-msvc", i686_pc_windows_msvc),
1159 ("i686-uwp-windows-msvc", i686_uwp_windows_msvc),
1160 ("i586-pc-windows-msvc", i586_pc_windows_msvc),
1161 ("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
1162 ("thumbv7a-uwp-windows-msvc", thumbv7a_uwp_windows_msvc),
1164 ("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
1165 ("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
1166 ("wasm32-unknown-unknown", wasm32_unknown_unknown),
1167 ("wasm32-wasi", wasm32_wasi),
1168 ("wasm64-unknown-unknown", wasm64_unknown_unknown),
1170 ("thumbv6m-none-eabi", thumbv6m_none_eabi),
1171 ("thumbv7m-none-eabi", thumbv7m_none_eabi),
1172 ("thumbv7em-none-eabi", thumbv7em_none_eabi),
1173 ("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
1174 ("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
1175 ("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
1176 ("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
1178 ("armv7a-none-eabi", armv7a_none_eabi),
1179 ("armv7a-none-eabihf", armv7a_none_eabihf),
1181 ("msp430-none-elf", msp430_none_elf),
1183 ("aarch64-unknown-hermit", aarch64_unknown_hermit),
1184 ("x86_64-unknown-hermit", x86_64_unknown_hermit),
1186 ("riscv32i-unknown-none-elf", riscv32i_unknown_none_elf),
1187 ("riscv32im-unknown-none-elf", riscv32im_unknown_none_elf),
1188 ("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
1189 ("riscv32imc-esp-espidf", riscv32imc_esp_espidf),
1190 ("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
1191 ("riscv32imac-unknown-xous-elf", riscv32imac_unknown_xous_elf),
1192 ("riscv32gc-unknown-linux-gnu", riscv32gc_unknown_linux_gnu),
1193 ("riscv32gc-unknown-linux-musl", riscv32gc_unknown_linux_musl),
1194 ("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
1195 ("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
1196 ("riscv64gc-unknown-linux-gnu", riscv64gc_unknown_linux_gnu),
1197 ("riscv64gc-unknown-linux-musl", riscv64gc_unknown_linux_musl),
1199 ("aarch64-unknown-none", aarch64_unknown_none),
1200 ("aarch64-unknown-none-softfloat", aarch64_unknown_none_softfloat),
1202 ("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
1204 ("x86_64-unknown-uefi", x86_64_unknown_uefi),
1205 ("i686-unknown-uefi", i686_unknown_uefi),
1206 ("aarch64-unknown-uefi", aarch64_unknown_uefi),
1208 ("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
1210 ("i686-wrs-vxworks", i686_wrs_vxworks),
1211 ("x86_64-wrs-vxworks", x86_64_wrs_vxworks),
1212 ("armv7-wrs-vxworks-eabihf", armv7_wrs_vxworks_eabihf),
1213 ("aarch64-wrs-vxworks", aarch64_wrs_vxworks),
1214 ("powerpc-wrs-vxworks", powerpc_wrs_vxworks),
1215 ("powerpc-wrs-vxworks-spe", powerpc_wrs_vxworks_spe),
1216 ("powerpc64-wrs-vxworks", powerpc64_wrs_vxworks),
1218 ("aarch64-kmc-solid_asp3", aarch64_kmc_solid_asp3),
1219 ("armv7a-kmc-solid_asp3-eabi", armv7a_kmc_solid_asp3_eabi),
1220 ("armv7a-kmc-solid_asp3-eabihf", armv7a_kmc_solid_asp3_eabihf),
1222 ("mipsel-sony-psp", mipsel_sony_psp),
1223 ("mipsel-sony-psx", mipsel_sony_psx),
1224 ("mipsel-unknown-none", mipsel_unknown_none),
1225 ("thumbv4t-none-eabi", thumbv4t_none_eabi),
1226 ("armv4t-none-eabi", armv4t_none_eabi),
1227 ("thumbv5te-none-eabi", thumbv5te_none_eabi),
1228 ("armv5te-none-eabi", armv5te_none_eabi),
1230 ("aarch64_be-unknown-linux-gnu", aarch64_be_unknown_linux_gnu),
1231 ("aarch64-unknown-linux-gnu_ilp32", aarch64_unknown_linux_gnu_ilp32),
1232 ("aarch64_be-unknown-linux-gnu_ilp32", aarch64_be_unknown_linux_gnu_ilp32),
1234 ("bpfeb-unknown-none", bpfeb_unknown_none),
1235 ("bpfel-unknown-none", bpfel_unknown_none),
1237 ("armv6k-nintendo-3ds", armv6k_nintendo_3ds),
1239 ("aarch64-nintendo-switch-freestanding", aarch64_nintendo_switch_freestanding),
1241 ("armv7-unknown-linux-uclibceabi", armv7_unknown_linux_uclibceabi),
1242 ("armv7-unknown-linux-uclibceabihf", armv7_unknown_linux_uclibceabihf),
1244 ("x86_64-unknown-none", x86_64_unknown_none),
1246 ("mips64-openwrt-linux-musl", mips64_openwrt_linux_musl),
1248 ("aarch64-unknown-nto-qnx7.1.0", aarch64_unknown_nto_qnx_710),
1249 ("x86_64-pc-nto-qnx7.1.0", x86_64_pc_nto_qnx710),
1252 /// Cow-Vec-Str: Cow<'static, [Cow<'static, str>]>
1255 ::std::borrow::Cow::Borrowed(&[])
1257 ($($x:expr),+ $(,)?) => {
1258 ::std::borrow::Cow::Borrowed(&[
1260 ::std::borrow::Cow::Borrowed($x),
1268 /// Warnings encountered when parsing the target `json`.
1270 /// Includes fields that weren't recognized and fields that don't have the expected type.
1271 #[derive(Debug, PartialEq)]
1272 pub struct TargetWarnings {
1273 unused_fields: Vec<String>,
1274 incorrect_type: Vec<String>,
1277 impl TargetWarnings {
1278 pub fn empty() -> Self {
1279 Self { unused_fields: Vec::new(), incorrect_type: Vec::new() }
1282 pub fn warning_messages(&self) -> Vec<String> {
1283 let mut warnings = vec![];
1284 if !self.unused_fields.is_empty() {
1285 warnings.push(format!(
1286 "target json file contains unused fields: {}",
1287 self.unused_fields.join(", ")
1290 if !self.incorrect_type.is_empty() {
1291 warnings.push(format!(
1292 "target json file contains fields whose value doesn't have the correct json type: {}",
1293 self.incorrect_type.join(", ")
1300 /// Everything `rustc` knows about how to compile for a specific target.
1302 /// Every field here must be specified, and has no default value.
1303 #[derive(PartialEq, Clone, Debug)]
1305 /// Target triple to pass to LLVM.
1306 pub llvm_target: StaticCow<str>,
1307 /// Number of bits in a pointer. Influences the `target_pointer_width` `cfg` variable.
1308 pub pointer_width: u32,
1309 /// Architecture to use for ABI considerations. Valid options include: "x86",
1310 /// "x86_64", "arm", "aarch64", "mips", "powerpc", "powerpc64", and others.
1311 pub arch: StaticCow<str>,
1312 /// [Data layout](https://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
1313 pub data_layout: StaticCow<str>,
1314 /// Optional settings with defaults.
1315 pub options: TargetOptions,
1318 pub trait HasTargetSpec {
1319 fn target_spec(&self) -> &Target;
1322 impl HasTargetSpec for Target {
1324 fn target_spec(&self) -> &Target {
1329 type StaticCow<T> = Cow<'static, T>;
1331 /// Optional aspects of a target specification.
1333 /// This has an implementation of `Default`, see each field for what the default is. In general,
1334 /// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
1336 /// `TargetOptions` as a separate structure is mostly an implementation detail of `Target`
1337 /// construction, all its fields logically belong to `Target` and available from `Target`
1338 /// through `Deref` impls.
1339 #[derive(PartialEq, Clone, Debug)]
1340 pub struct TargetOptions {
1341 /// Whether the target is built-in or loaded from a custom target specification.
1342 pub is_builtin: bool,
1344 /// Used as the `target_endian` `cfg` variable. Defaults to little endian.
1346 /// Width of c_int type. Defaults to "32".
1347 pub c_int_width: StaticCow<str>,
1348 /// OS name to use for conditional compilation (`target_os`). Defaults to "none".
1349 /// "none" implies a bare metal target without `std` library.
1350 /// A couple of targets having `std` also use "unknown" as an `os` value,
1351 /// but they are exceptions.
1352 pub os: StaticCow<str>,
1353 /// Environment name to use for conditional compilation (`target_env`). Defaults to "".
1354 pub env: StaticCow<str>,
1355 /// ABI name to distinguish multiple ABIs on the same OS and architecture. For instance, `"eabi"`
1356 /// or `"eabihf"`. Defaults to "".
1357 pub abi: StaticCow<str>,
1358 /// Vendor name to use for conditional compilation (`target_vendor`). Defaults to "unknown".
1359 pub vendor: StaticCow<str>,
1361 /// Linker to invoke
1362 pub linker: Option<StaticCow<str>>,
1363 /// Default linker flavor used if `-C linker-flavor` or `-C linker` are not passed
1364 /// on the command line. Defaults to `LinkerFlavor::Gnu(Cc::Yes, Lld::No)`.
1365 pub linker_flavor: LinkerFlavor,
1366 linker_flavor_json: LinkerFlavorCli,
1367 lld_flavor_json: LldFlavor,
1368 linker_is_gnu_json: bool,
1370 /// Objects to link before and after all other object code.
1371 pub pre_link_objects: CrtObjects,
1372 pub post_link_objects: CrtObjects,
1373 /// Same as `(pre|post)_link_objects`, but when self-contained linking mode is enabled.
1374 pub pre_link_objects_self_contained: CrtObjects,
1375 pub post_link_objects_self_contained: CrtObjects,
1376 pub link_self_contained: LinkSelfContainedDefault,
1378 /// Linker arguments that are passed *before* any user-defined libraries.
1379 pub pre_link_args: LinkArgs,
1380 pre_link_args_json: LinkArgsCli,
1381 /// Linker arguments that are unconditionally passed after any
1382 /// user-defined but before post-link objects. Standard platform
1383 /// libraries that should be always be linked to, usually go here.
1384 pub late_link_args: LinkArgs,
1385 late_link_args_json: LinkArgsCli,
1386 /// Linker arguments used in addition to `late_link_args` if at least one
1387 /// Rust dependency is dynamically linked.
1388 pub late_link_args_dynamic: LinkArgs,
1389 late_link_args_dynamic_json: LinkArgsCli,
1390 /// Linker arguments used in addition to `late_link_args` if all Rust
1391 /// dependencies are statically linked.
1392 pub late_link_args_static: LinkArgs,
1393 late_link_args_static_json: LinkArgsCli,
1394 /// Linker arguments that are unconditionally passed *after* any
1395 /// user-defined libraries.
1396 pub post_link_args: LinkArgs,
1397 post_link_args_json: LinkArgsCli,
1399 /// Optional link script applied to `dylib` and `executable` crate types.
1400 /// This is a string containing the script, not a path. Can only be applied
1401 /// to linkers where linker flavor matches `LinkerFlavor::Gnu(..)`.
1402 pub link_script: Option<StaticCow<str>>,
1403 /// Environment variables to be set for the linker invocation.
1404 pub link_env: StaticCow<[(StaticCow<str>, StaticCow<str>)]>,
1405 /// Environment variables to be removed for the linker invocation.
1406 pub link_env_remove: StaticCow<[StaticCow<str>]>,
1408 /// Extra arguments to pass to the external assembler (when used)
1409 pub asm_args: StaticCow<[StaticCow<str>]>,
1411 /// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
1413 pub cpu: StaticCow<str>,
1414 /// Default target features to pass to LLVM. These features will *always* be
1415 /// passed, and cannot be disabled even via `-C`. Corresponds to `llc
1416 /// -mattr=$features`.
1417 pub features: StaticCow<str>,
1418 /// Whether dynamic linking is available on this target. Defaults to false.
1419 pub dynamic_linking: bool,
1420 /// If dynamic linking is available, whether only cdylibs are supported.
1421 pub only_cdylib: bool,
1422 /// Whether executables are available on this target. Defaults to true.
1423 pub executables: bool,
1424 /// Relocation model to use in object file. Corresponds to `llc
1425 /// -relocation-model=$relocation_model`. Defaults to `Pic`.
1426 pub relocation_model: RelocModel,
1427 /// Code model to use. Corresponds to `llc -code-model=$code_model`.
1428 /// Defaults to `None` which means "inherited from the base LLVM target".
1429 pub code_model: Option<CodeModel>,
1430 /// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
1431 /// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
1432 pub tls_model: TlsModel,
1433 /// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
1434 pub disable_redzone: bool,
1435 /// Frame pointer mode for this target. Defaults to `MayOmit`.
1436 pub frame_pointer: FramePointer,
1437 /// Emit each function in its own section. Defaults to true.
1438 pub function_sections: bool,
1439 /// String to prepend to the name of every dynamic library. Defaults to "lib".
1440 pub dll_prefix: StaticCow<str>,
1441 /// String to append to the name of every dynamic library. Defaults to ".so".
1442 pub dll_suffix: StaticCow<str>,
1443 /// String to append to the name of every executable.
1444 pub exe_suffix: StaticCow<str>,
1445 /// String to prepend to the name of every static library. Defaults to "lib".
1446 pub staticlib_prefix: StaticCow<str>,
1447 /// String to append to the name of every static library. Defaults to ".a".
1448 pub staticlib_suffix: StaticCow<str>,
1449 /// Values of the `target_family` cfg set for this target.
1451 /// Common options are: "unix", "windows". Defaults to no families.
1453 /// See <https://doc.rust-lang.org/reference/conditional-compilation.html#target_family>.
1454 pub families: StaticCow<[StaticCow<str>]>,
1455 /// Whether the target toolchain's ABI supports returning small structs as an integer.
1456 pub abi_return_struct_as_int: bool,
1457 /// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
1458 /// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
1459 /// Also indiates whether to use Apple-specific ABI changes, such as extending function
1460 /// parameters to 32-bits.
1461 pub is_like_osx: bool,
1462 /// Whether the target toolchain is like Solaris's.
1463 /// Only useful for compiling against Illumos/Solaris,
1464 /// as they have a different set of linker flags. Defaults to false.
1465 pub is_like_solaris: bool,
1466 /// Whether the target is like Windows.
1467 /// This is a combination of several more specific properties represented as a single flag:
1468 /// - The target uses a Windows ABI,
1469 /// - uses PE/COFF as a format for object code,
1470 /// - uses Windows-style dllexport/dllimport for shared libraries,
1471 /// - uses import libraries and .def files for symbol exports,
1472 /// - executables support setting a subsystem.
1473 pub is_like_windows: bool,
1474 /// Whether the target is like MSVC.
1475 /// This is a combination of several more specific properties represented as a single flag:
1476 /// - The target has all the properties from `is_like_windows`
1477 /// (for in-tree targets "is_like_msvc ⇒ is_like_windows" is ensured by a unit test),
1478 /// - has some MSVC-specific Windows ABI properties,
1479 /// - uses a link.exe-like linker,
1480 /// - uses CodeView/PDB for debuginfo and natvis for its visualization,
1481 /// - uses SEH-based unwinding,
1482 /// - supports control flow guard mechanism.
1483 pub is_like_msvc: bool,
1484 /// Whether a target toolchain is like WASM.
1485 pub is_like_wasm: bool,
1486 /// Whether a target toolchain is like Android, implying a Linux kernel and a Bionic libc
1487 pub is_like_android: bool,
1488 /// Default supported version of DWARF on this platform.
1489 /// Useful because some platforms (osx, bsd) only want up to DWARF2.
1490 pub default_dwarf_version: u32,
1491 /// The MinGW toolchain has a known issue that prevents it from correctly
1492 /// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
1493 /// symbol needs its own COMDAT section, weak linkage implies a large
1494 /// number sections that easily exceeds the given limit for larger
1495 /// codebases. Consequently we want a way to disallow weak linkage on some
1497 pub allows_weak_linkage: bool,
1498 /// Whether the linker support rpaths or not. Defaults to false.
1499 pub has_rpath: bool,
1500 /// Whether to disable linking to the default libraries, typically corresponds
1501 /// to `-nodefaultlibs`. Defaults to true.
1502 pub no_default_libraries: bool,
1503 /// Dynamically linked executables can be compiled as position independent
1504 /// if the default relocation model of position independent code is not
1505 /// changed. This is a requirement to take advantage of ASLR, as otherwise
1506 /// the functions in the executable are not randomized and can be used
1507 /// during an exploit of a vulnerability in any code.
1508 pub position_independent_executables: bool,
1509 /// Executables that are both statically linked and position-independent are supported.
1510 pub static_position_independent_executables: bool,
1511 /// Determines if the target always requires using the PLT for indirect
1512 /// library calls or not. This controls the default value of the `-Z plt` flag.
1513 pub needs_plt: bool,
1514 /// Either partial, full, or off. Full RELRO makes the dynamic linker
1515 /// resolve all symbols at startup and marks the GOT read-only before
1516 /// starting the program, preventing overwriting the GOT.
1517 pub relro_level: RelroLevel,
1518 /// Format that archives should be emitted in. This affects whether we use
1519 /// LLVM to assemble an archive or fall back to the system linker, and
1520 /// currently only "gnu" is used to fall into LLVM. Unknown strings cause
1521 /// the system linker to be used.
1522 pub archive_format: StaticCow<str>,
1523 /// Is asm!() allowed? Defaults to true.
1524 pub allow_asm: bool,
1525 /// Whether the runtime startup code requires the `main` function be passed
1526 /// `argc` and `argv` values.
1527 pub main_needs_argc_argv: bool,
1529 /// Flag indicating whether #[thread_local] is available for this target.
1530 pub has_thread_local: bool,
1531 // This is mainly for easy compatibility with emscripten.
1532 // If we give emcc .o files that are actually .bc files it
1533 // will 'just work'.
1534 pub obj_is_bitcode: bool,
1535 /// Whether the target requires that emitted object code includes bitcode.
1536 pub forces_embed_bitcode: bool,
1537 /// Content of the LLVM cmdline section associated with embedded bitcode.
1538 pub bitcode_llvm_cmdline: StaticCow<str>,
1540 /// Don't use this field; instead use the `.min_atomic_width()` method.
1541 pub min_atomic_width: Option<u64>,
1543 /// Don't use this field; instead use the `.max_atomic_width()` method.
1544 pub max_atomic_width: Option<u64>,
1546 /// Whether the target supports atomic CAS operations natively
1547 pub atomic_cas: bool,
1549 /// Panic strategy: "unwind" or "abort"
1550 pub panic_strategy: PanicStrategy,
1552 /// Whether or not linking dylibs to a static CRT is allowed.
1553 pub crt_static_allows_dylibs: bool,
1554 /// Whether or not the CRT is statically linked by default.
1555 pub crt_static_default: bool,
1556 /// Whether or not crt-static is respected by the compiler (or is a no-op).
1557 pub crt_static_respected: bool,
1559 /// The implementation of stack probes to use.
1560 pub stack_probes: StackProbeType,
1562 /// The minimum alignment for global symbols.
1563 pub min_global_align: Option<u64>,
1565 /// Default number of codegen units to use in debug mode
1566 pub default_codegen_units: Option<u64>,
1568 /// Whether to generate trap instructions in places where optimization would
1569 /// otherwise produce control flow that falls through into unrelated memory.
1570 pub trap_unreachable: bool,
1572 /// This target requires everything to be compiled with LTO to emit a final
1573 /// executable, aka there is no native linker for this target.
1574 pub requires_lto: bool,
1576 /// This target has no support for threads.
1577 pub singlethread: bool,
1579 /// Whether library functions call lowering/optimization is disabled in LLVM
1580 /// for this target unconditionally.
1581 pub no_builtins: bool,
1583 /// The default visibility for symbols in this target should be "hidden"
1584 /// rather than "default"
1585 pub default_hidden_visibility: bool,
1587 /// Whether a .debug_gdb_scripts section will be added to the output object file
1588 pub emit_debug_gdb_scripts: bool,
1590 /// Whether or not to unconditionally `uwtable` attributes on functions,
1591 /// typically because the platform needs to unwind for things like stack
1593 pub requires_uwtable: bool,
1595 /// Whether or not to emit `uwtable` attributes on functions if `-C force-unwind-tables`
1596 /// is not specified and `uwtable` is not required on this target.
1597 pub default_uwtable: bool,
1599 /// Whether or not SIMD types are passed by reference in the Rust ABI,
1600 /// typically required if a target can be compiled with a mixed set of
1601 /// target features. This is `true` by default, and `false` for targets like
1602 /// wasm32 where the whole program either has simd or not.
1603 pub simd_types_indirect: bool,
1605 /// Pass a list of symbol which should be exported in the dylib to the linker.
1606 pub limit_rdylib_exports: bool,
1608 /// If set, have the linker export exactly these symbols, instead of using
1609 /// the usual logic to figure this out from the crate itself.
1610 pub override_export_symbols: Option<StaticCow<[StaticCow<str>]>>,
1612 /// Determines how or whether the MergeFunctions LLVM pass should run for
1613 /// this target. Either "disabled", "trampolines", or "aliases".
1614 /// The MergeFunctions pass is generally useful, but some targets may need
1615 /// to opt out. The default is "aliases".
1617 /// Workaround for: <https://github.com/rust-lang/rust/issues/57356>
1618 pub merge_functions: MergeFunctions,
1620 /// Use platform dependent mcount function
1621 pub mcount: StaticCow<str>,
1623 /// LLVM ABI name, corresponds to the '-mabi' parameter available in multilib C compilers
1624 pub llvm_abiname: StaticCow<str>,
1626 /// Whether or not RelaxElfRelocation flag will be passed to the linker
1627 pub relax_elf_relocations: bool,
1629 /// Additional arguments to pass to LLVM, similar to the `-C llvm-args` codegen option.
1630 pub llvm_args: StaticCow<[StaticCow<str>]>,
1632 /// Whether to use legacy .ctors initialization hooks rather than .init_array. Defaults
1633 /// to false (uses .init_array).
1634 pub use_ctors_section: bool,
1636 /// Whether the linker is instructed to add a `GNU_EH_FRAME` ELF header
1637 /// used to locate unwinding information is passed
1638 /// (only has effect if the linker is `ld`-like).
1639 pub eh_frame_header: bool,
1641 /// Is true if the target is an ARM architecture using thumb v1 which allows for
1642 /// thumb and arm interworking.
1643 pub has_thumb_interworking: bool,
1645 /// Which kind of debuginfo is used by this target?
1646 pub debuginfo_kind: DebuginfoKind,
1647 /// How to handle split debug information, if at all. Specifying `None` has
1648 /// target-specific meaning.
1649 pub split_debuginfo: SplitDebuginfo,
1650 /// Which kinds of split debuginfo are supported by the target?
1651 pub supported_split_debuginfo: StaticCow<[SplitDebuginfo]>,
1653 /// The sanitizers supported by this target
1655 /// Note that the support here is at a codegen level. If the machine code with sanitizer
1656 /// enabled can generated on this target, but the necessary supporting libraries are not
1657 /// distributed with the target, the sanitizer should still appear in this list for the target.
1658 pub supported_sanitizers: SanitizerSet,
1660 /// If present it's a default value to use for adjusting the C ABI.
1661 pub default_adjusted_cabi: Option<Abi>,
1663 /// Minimum number of bits in #[repr(C)] enum. Defaults to 32.
1664 pub c_enum_min_bits: u64,
1666 /// Whether or not the DWARF `.debug_aranges` section should be generated.
1667 pub generate_arange_section: bool,
1669 /// Whether the target supports stack canary checks. `true` by default,
1670 /// since this is most common among tier 1 and tier 2 targets.
1671 pub supports_stack_protector: bool,
1673 // The name of entry function.
1674 // Default value is "main"
1675 pub entry_name: StaticCow<str>,
1677 // The ABI of entry function.
1678 // Default value is `Conv::C`, i.e. C call convention
1679 pub entry_abi: Conv,
1682 /// Add arguments for the given flavor and also for its "twin" flavors
1683 /// that have a compatible command line interface.
1684 fn add_link_args_iter(
1685 link_args: &mut LinkArgs,
1686 flavor: LinkerFlavor,
1687 args: impl Iterator<Item = StaticCow<str>> + Clone,
1689 let mut insert = |flavor| link_args.entry(flavor).or_default().extend(args.clone());
1692 LinkerFlavor::Gnu(cc, lld) => {
1693 assert_eq!(lld, Lld::No);
1694 insert(LinkerFlavor::Gnu(cc, Lld::Yes));
1696 LinkerFlavor::Darwin(cc, lld) => {
1697 assert_eq!(lld, Lld::No);
1698 insert(LinkerFlavor::Darwin(cc, Lld::Yes));
1700 LinkerFlavor::Msvc(lld) => {
1701 assert_eq!(lld, Lld::No);
1702 insert(LinkerFlavor::Msvc(Lld::Yes));
1704 LinkerFlavor::WasmLld(..)
1705 | LinkerFlavor::Unix(..)
1706 | LinkerFlavor::EmCc
1708 | LinkerFlavor::Ptx => {}
1712 fn add_link_args(link_args: &mut LinkArgs, flavor: LinkerFlavor, args: &[&'static str]) {
1713 add_link_args_iter(link_args, flavor, args.iter().copied().map(Cow::Borrowed))
1716 impl TargetOptions {
1717 fn link_args(flavor: LinkerFlavor, args: &[&'static str]) -> LinkArgs {
1718 let mut link_args = LinkArgs::new();
1719 add_link_args(&mut link_args, flavor, args);
1723 fn add_pre_link_args(&mut self, flavor: LinkerFlavor, args: &[&'static str]) {
1724 add_link_args(&mut self.pre_link_args, flavor, args);
1727 fn add_post_link_args(&mut self, flavor: LinkerFlavor, args: &[&'static str]) {
1728 add_link_args(&mut self.post_link_args, flavor, args);
1731 fn update_from_cli(&mut self) {
1732 self.linker_flavor = LinkerFlavor::from_cli_impl(
1733 self.linker_flavor_json,
1734 self.lld_flavor_json,
1735 self.linker_is_gnu_json,
1737 for (args, args_json) in [
1738 (&mut self.pre_link_args, &self.pre_link_args_json),
1739 (&mut self.late_link_args, &self.late_link_args_json),
1740 (&mut self.late_link_args_dynamic, &self.late_link_args_dynamic_json),
1741 (&mut self.late_link_args_static, &self.late_link_args_static_json),
1742 (&mut self.post_link_args, &self.post_link_args_json),
1745 for (flavor, args_json) in args_json {
1746 // Cannot use `from_cli` due to borrow checker.
1747 let linker_flavor = LinkerFlavor::from_cli_impl(
1749 self.lld_flavor_json,
1750 self.linker_is_gnu_json,
1752 // Normalize to no lld to avoid asserts.
1753 let linker_flavor = match linker_flavor {
1754 LinkerFlavor::Gnu(cc, _) => LinkerFlavor::Gnu(cc, Lld::No),
1755 LinkerFlavor::Darwin(cc, _) => LinkerFlavor::Darwin(cc, Lld::No),
1756 LinkerFlavor::Msvc(_) => LinkerFlavor::Msvc(Lld::No),
1759 if !args.contains_key(&linker_flavor) {
1760 add_link_args_iter(args, linker_flavor, args_json.iter().cloned());
1766 fn update_to_cli(&mut self) {
1767 self.linker_flavor_json = self.linker_flavor.to_cli();
1768 self.lld_flavor_json = self.linker_flavor.lld_flavor();
1769 self.linker_is_gnu_json = self.linker_flavor.is_gnu();
1770 for (args, args_json) in [
1771 (&self.pre_link_args, &mut self.pre_link_args_json),
1772 (&self.late_link_args, &mut self.late_link_args_json),
1773 (&self.late_link_args_dynamic, &mut self.late_link_args_dynamic_json),
1774 (&self.late_link_args_static, &mut self.late_link_args_static_json),
1775 (&self.post_link_args, &mut self.post_link_args_json),
1778 args.iter().map(|(flavor, args)| (flavor.to_cli(), args.clone())).collect();
1783 impl Default for TargetOptions {
1784 /// Creates a set of "sane defaults" for any target. This is still
1785 /// incomplete, and if used for compilation, will certainly not work.
1786 fn default() -> TargetOptions {
1789 endian: Endian::Little,
1790 c_int_width: "32".into(),
1794 vendor: "unknown".into(),
1795 linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.into()),
1796 linker_flavor: LinkerFlavor::Gnu(Cc::Yes, Lld::No),
1797 linker_flavor_json: LinkerFlavorCli::Gcc,
1798 lld_flavor_json: LldFlavor::Ld,
1799 linker_is_gnu_json: true,
1802 cpu: "generic".into(),
1803 features: "".into(),
1804 dynamic_linking: false,
1807 relocation_model: RelocModel::Pic,
1809 tls_model: TlsModel::GeneralDynamic,
1810 disable_redzone: false,
1811 frame_pointer: FramePointer::MayOmit,
1812 function_sections: true,
1813 dll_prefix: "lib".into(),
1814 dll_suffix: ".so".into(),
1815 exe_suffix: "".into(),
1816 staticlib_prefix: "lib".into(),
1817 staticlib_suffix: ".a".into(),
1819 abi_return_struct_as_int: false,
1821 is_like_solaris: false,
1822 is_like_windows: false,
1823 is_like_msvc: false,
1824 is_like_wasm: false,
1825 is_like_android: false,
1826 default_dwarf_version: 4,
1827 allows_weak_linkage: true,
1829 no_default_libraries: true,
1830 position_independent_executables: false,
1831 static_position_independent_executables: false,
1833 relro_level: RelroLevel::None,
1834 pre_link_objects: Default::default(),
1835 post_link_objects: Default::default(),
1836 pre_link_objects_self_contained: Default::default(),
1837 post_link_objects_self_contained: Default::default(),
1838 link_self_contained: LinkSelfContainedDefault::False,
1839 pre_link_args: LinkArgs::new(),
1840 pre_link_args_json: LinkArgsCli::new(),
1841 late_link_args: LinkArgs::new(),
1842 late_link_args_json: LinkArgsCli::new(),
1843 late_link_args_dynamic: LinkArgs::new(),
1844 late_link_args_dynamic_json: LinkArgsCli::new(),
1845 late_link_args_static: LinkArgs::new(),
1846 late_link_args_static_json: LinkArgsCli::new(),
1847 post_link_args: LinkArgs::new(),
1848 post_link_args_json: LinkArgsCli::new(),
1850 link_env_remove: cvs![],
1851 archive_format: "gnu".into(),
1852 main_needs_argc_argv: true,
1854 has_thread_local: false,
1855 obj_is_bitcode: false,
1856 forces_embed_bitcode: false,
1857 bitcode_llvm_cmdline: "".into(),
1858 min_atomic_width: None,
1859 max_atomic_width: None,
1861 panic_strategy: PanicStrategy::Unwind,
1862 crt_static_allows_dylibs: false,
1863 crt_static_default: false,
1864 crt_static_respected: false,
1865 stack_probes: StackProbeType::None,
1866 min_global_align: None,
1867 default_codegen_units: None,
1868 trap_unreachable: true,
1869 requires_lto: false,
1870 singlethread: false,
1872 default_hidden_visibility: false,
1873 emit_debug_gdb_scripts: true,
1874 requires_uwtable: false,
1875 default_uwtable: false,
1876 simd_types_indirect: true,
1877 limit_rdylib_exports: true,
1878 override_export_symbols: None,
1879 merge_functions: MergeFunctions::Aliases,
1880 mcount: "mcount".into(),
1881 llvm_abiname: "".into(),
1882 relax_elf_relocations: false,
1884 use_ctors_section: false,
1885 eh_frame_header: true,
1886 has_thumb_interworking: false,
1887 debuginfo_kind: Default::default(),
1888 split_debuginfo: Default::default(),
1889 // `Off` is supported by default, but targets can remove this manually, e.g. Windows.
1890 supported_split_debuginfo: Cow::Borrowed(&[SplitDebuginfo::Off]),
1891 supported_sanitizers: SanitizerSet::empty(),
1892 default_adjusted_cabi: None,
1893 c_enum_min_bits: 32,
1894 generate_arange_section: true,
1895 supports_stack_protector: true,
1896 entry_name: "main".into(),
1902 /// `TargetOptions` being a separate type is basically an implementation detail of `Target` that is
1903 /// used for providing defaults. Perhaps there's a way to merge `TargetOptions` into `Target` so
1904 /// this `Deref` implementation is no longer necessary.
1905 impl Deref for Target {
1906 type Target = TargetOptions;
1909 fn deref(&self) -> &Self::Target {
1913 impl DerefMut for Target {
1915 fn deref_mut(&mut self) -> &mut Self::Target {
1921 /// Given a function ABI, turn it into the correct ABI for this target.
1922 pub fn adjust_abi(&self, abi: Abi) -> Abi {
1924 Abi::C { .. } => self.default_adjusted_cabi.unwrap_or(abi),
1925 Abi::System { unwind } if self.is_like_windows && self.arch == "x86" => {
1926 Abi::Stdcall { unwind }
1928 Abi::System { unwind } => Abi::C { unwind },
1929 Abi::EfiApi if self.arch == "arm" => Abi::Aapcs { unwind: false },
1930 Abi::EfiApi if self.arch == "x86_64" => Abi::Win64 { unwind: false },
1931 Abi::EfiApi => Abi::C { unwind: false },
1933 // See commentary in `is_abi_supported`.
1934 Abi::Stdcall { .. } | Abi::Thiscall { .. } if self.arch == "x86" => abi,
1935 Abi::Stdcall { unwind } | Abi::Thiscall { unwind } => Abi::C { unwind },
1936 Abi::Fastcall { .. } if self.arch == "x86" => abi,
1937 Abi::Vectorcall { .. } if ["x86", "x86_64"].contains(&&self.arch[..]) => abi,
1938 Abi::Fastcall { unwind } | Abi::Vectorcall { unwind } => Abi::C { unwind },
1944 /// Returns a None if the UNSUPPORTED_CALLING_CONVENTIONS lint should be emitted
1945 pub fn is_abi_supported(&self, abi: Abi) -> Option<bool> {
1958 ["arm", "aarch64", "riscv32", "riscv64", "x86", "x86_64"].contains(&&self.arch[..])
1960 X86Interrupt => ["x86", "x86_64"].contains(&&self.arch[..]),
1961 Aapcs { .. } => "arm" == self.arch,
1962 CCmseNonSecureCall => ["arm", "aarch64"].contains(&&self.arch[..]),
1963 Win64 { .. } | SysV64 { .. } => self.arch == "x86_64",
1964 PtxKernel => self.arch == "nvptx64",
1965 Msp430Interrupt => self.arch == "msp430",
1966 AmdGpuKernel => self.arch == "amdgcn",
1967 AvrInterrupt | AvrNonBlockingInterrupt => self.arch == "avr",
1968 Wasm => ["wasm32", "wasm64"].contains(&&self.arch[..]),
1969 Thiscall { .. } => self.arch == "x86",
1970 // On windows these fall-back to platform native calling convention (C) when the
1971 // architecture is not supported.
1973 // This is I believe a historical accident that has occurred as part of Microsoft
1974 // striving to allow most of the code to "just" compile when support for 64-bit x86
1975 // was added and then later again, when support for ARM architectures was added.
1977 // This is well documented across MSDN. Support for this in Rust has been added in
1978 // #54576. This makes much more sense in context of Microsoft's C++ than it does in
1979 // Rust, but there isn't much leeway remaining here to change it back at the time this
1980 // comment has been written.
1982 // Following are the relevant excerpts from the MSDN documentation.
1984 // > The __vectorcall calling convention is only supported in native code on x86 and
1985 // x64 processors that include Streaming SIMD Extensions 2 (SSE2) and above.
1987 // > On ARM machines, __vectorcall is accepted and ignored by the compiler.
1989 // -- https://docs.microsoft.com/en-us/cpp/cpp/vectorcall?view=msvc-160
1991 // > On ARM and x64 processors, __stdcall is accepted and ignored by the compiler;
1993 // -- https://docs.microsoft.com/en-us/cpp/cpp/stdcall?view=msvc-160
1995 // > In most cases, keywords or compiler switches that specify an unsupported
1996 // > convention on a particular platform are ignored, and the platform default
1997 // > convention is used.
1999 // -- https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
2000 Stdcall { .. } | Fastcall { .. } | Vectorcall { .. } if self.is_like_windows => true,
2001 // Outside of Windows we want to only support these calling conventions for the
2002 // architectures for which these calling conventions are actually well defined.
2003 Stdcall { .. } | Fastcall { .. } if self.arch == "x86" => true,
2004 Vectorcall { .. } if ["x86", "x86_64"].contains(&&self.arch[..]) => true,
2005 // Return a `None` for other cases so that we know to emit a future compat lint.
2006 Stdcall { .. } | Fastcall { .. } | Vectorcall { .. } => return None,
2010 /// Minimum integer size in bits that this target can perform atomic
2012 pub fn min_atomic_width(&self) -> u64 {
2013 self.min_atomic_width.unwrap_or(8)
2016 /// Maximum integer size in bits that this target can perform atomic
2018 pub fn max_atomic_width(&self) -> u64 {
2019 self.max_atomic_width.unwrap_or_else(|| self.pointer_width.into())
2022 /// Loads a target descriptor from a JSON object.
2023 pub fn from_json(obj: Json) -> Result<(Target, TargetWarnings), String> {
2024 // While ugly, this code must remain this way to retain
2025 // compatibility with existing JSON fields and the internal
2026 // expected naming of the Target and TargetOptions structs.
2027 // To ensure compatibility is retained, the built-in targets
2028 // are round-tripped through this code to catch cases where
2029 // the JSON parser is not updated to match the structs.
2031 let mut obj = match obj {
2032 Value::Object(obj) => obj,
2033 _ => return Err("Expected JSON object for target")?,
2036 let mut get_req_field = |name: &str| {
2038 .and_then(|j| j.as_str().map(str::to_string))
2039 .ok_or_else(|| format!("Field {} in target specification is required", name))
2042 let mut base = Target {
2043 llvm_target: get_req_field("llvm-target")?.into(),
2044 pointer_width: get_req_field("target-pointer-width")?
2046 .map_err(|_| "target-pointer-width must be an integer".to_string())?,
2047 data_layout: get_req_field("data-layout")?.into(),
2048 arch: get_req_field("arch")?.into(),
2049 options: Default::default(),
2052 let mut incorrect_type = vec![];
2055 ($key_name:ident) => ( {
2056 let name = (stringify!($key_name)).replace("_", "-");
2057 if let Some(s) = obj.remove(&name).and_then(|s| s.as_str().map(str::to_string).map(Cow::from)) {
2061 ($key_name:ident = $json_name:expr) => ( {
2062 let name = $json_name;
2063 if let Some(s) = obj.remove(name).and_then(|s| s.as_str().map(str::to_string).map(Cow::from)) {
2067 ($key_name:ident, bool) => ( {
2068 let name = (stringify!($key_name)).replace("_", "-");
2069 if let Some(s) = obj.remove(&name).and_then(|b| b.as_bool()) {
2073 ($key_name:ident = $json_name:expr, bool) => ( {
2074 let name = $json_name;
2075 if let Some(s) = obj.remove(name).and_then(|b| b.as_bool()) {
2079 ($key_name:ident, u64) => ( {
2080 let name = (stringify!($key_name)).replace("_", "-");
2081 if let Some(s) = obj.remove(&name).and_then(|j| Json::as_u64(&j)) {
2085 ($key_name:ident, u32) => ( {
2086 let name = (stringify!($key_name)).replace("_", "-");
2087 if let Some(s) = obj.remove(&name).and_then(|b| b.as_u64()) {
2089 return Err("Not a valid DWARF version number".into());
2091 base.$key_name = s as u32;
2094 ($key_name:ident, Option<u64>) => ( {
2095 let name = (stringify!($key_name)).replace("_", "-");
2096 if let Some(s) = obj.remove(&name).and_then(|b| b.as_u64()) {
2097 base.$key_name = Some(s);
2100 ($key_name:ident, MergeFunctions) => ( {
2101 let name = (stringify!($key_name)).replace("_", "-");
2102 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2103 match s.parse::<MergeFunctions>() {
2104 Ok(mergefunc) => base.$key_name = mergefunc,
2105 _ => return Some(Err(format!("'{}' is not a valid value for \
2106 merge-functions. Use 'disabled', \
2107 'trampolines', or 'aliases'.",
2111 })).unwrap_or(Ok(()))
2113 ($key_name:ident, RelocModel) => ( {
2114 let name = (stringify!($key_name)).replace("_", "-");
2115 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2116 match s.parse::<RelocModel>() {
2117 Ok(relocation_model) => base.$key_name = relocation_model,
2118 _ => return Some(Err(format!("'{}' is not a valid relocation model. \
2119 Run `rustc --print relocation-models` to \
2120 see the list of supported values.", s))),
2123 })).unwrap_or(Ok(()))
2125 ($key_name:ident, CodeModel) => ( {
2126 let name = (stringify!($key_name)).replace("_", "-");
2127 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2128 match s.parse::<CodeModel>() {
2129 Ok(code_model) => base.$key_name = Some(code_model),
2130 _ => return Some(Err(format!("'{}' is not a valid code model. \
2131 Run `rustc --print code-models` to \
2132 see the list of supported values.", s))),
2135 })).unwrap_or(Ok(()))
2137 ($key_name:ident, TlsModel) => ( {
2138 let name = (stringify!($key_name)).replace("_", "-");
2139 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2140 match s.parse::<TlsModel>() {
2141 Ok(tls_model) => base.$key_name = tls_model,
2142 _ => return Some(Err(format!("'{}' is not a valid TLS model. \
2143 Run `rustc --print tls-models` to \
2144 see the list of supported values.", s))),
2147 })).unwrap_or(Ok(()))
2149 ($key_name:ident, PanicStrategy) => ( {
2150 let name = (stringify!($key_name)).replace("_", "-");
2151 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2153 "unwind" => base.$key_name = PanicStrategy::Unwind,
2154 "abort" => base.$key_name = PanicStrategy::Abort,
2155 _ => return Some(Err(format!("'{}' is not a valid value for \
2156 panic-strategy. Use 'unwind' or 'abort'.",
2160 })).unwrap_or(Ok(()))
2162 ($key_name:ident, RelroLevel) => ( {
2163 let name = (stringify!($key_name)).replace("_", "-");
2164 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2165 match s.parse::<RelroLevel>() {
2166 Ok(level) => base.$key_name = level,
2167 _ => return Some(Err(format!("'{}' is not a valid value for \
2168 relro-level. Use 'full', 'partial, or 'off'.",
2172 })).unwrap_or(Ok(()))
2174 ($key_name:ident, DebuginfoKind) => ( {
2175 let name = (stringify!($key_name)).replace("_", "-");
2176 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2177 match s.parse::<DebuginfoKind>() {
2178 Ok(level) => base.$key_name = level,
2179 _ => return Some(Err(
2180 format!("'{s}' is not a valid value for debuginfo-kind. Use 'dwarf', \
2181 'dwarf-dsym' or 'pdb'.")
2185 })).unwrap_or(Ok(()))
2187 ($key_name:ident, SplitDebuginfo) => ( {
2188 let name = (stringify!($key_name)).replace("_", "-");
2189 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2190 match s.parse::<SplitDebuginfo>() {
2191 Ok(level) => base.$key_name = level,
2192 _ => return Some(Err(format!("'{}' is not a valid value for \
2193 split-debuginfo. Use 'off' or 'dsymutil'.",
2197 })).unwrap_or(Ok(()))
2199 ($key_name:ident, list) => ( {
2200 let name = (stringify!($key_name)).replace("_", "-");
2201 if let Some(j) = obj.remove(&name) {
2202 if let Some(v) = j.as_array() {
2203 base.$key_name = v.iter()
2204 .map(|a| a.as_str().unwrap().to_string().into())
2207 incorrect_type.push(name)
2211 ($key_name:ident, opt_list) => ( {
2212 let name = (stringify!($key_name)).replace("_", "-");
2213 if let Some(j) = obj.remove(&name) {
2214 if let Some(v) = j.as_array() {
2215 base.$key_name = Some(v.iter()
2216 .map(|a| a.as_str().unwrap().to_string().into())
2219 incorrect_type.push(name)
2223 ($key_name:ident, falliable_list) => ( {
2224 let name = (stringify!($key_name)).replace("_", "-");
2225 obj.remove(&name).and_then(|j| {
2226 if let Some(v) = j.as_array() {
2227 match v.iter().map(|a| FromStr::from_str(a.as_str().unwrap())).collect() {
2228 Ok(l) => { base.$key_name = l },
2229 // FIXME: `falliable_list` can't re-use the `key!` macro for list
2230 // elements and the error messages from that macro, so it has a bad
2231 // generic message instead
2232 Err(_) => return Some(Err(
2233 format!("`{:?}` is not a valid value for `{}`", j, name)
2237 incorrect_type.push(name)
2240 }).unwrap_or(Ok(()))
2242 ($key_name:ident, optional) => ( {
2243 let name = (stringify!($key_name)).replace("_", "-");
2244 if let Some(o) = obj.remove(&name) {
2247 .map(|s| s.to_string().into());
2250 ($key_name:ident = $json_name:expr, LldFlavor) => ( {
2251 let name = $json_name;
2252 obj.remove(name).and_then(|o| o.as_str().and_then(|s| {
2253 if let Some(flavor) = LldFlavor::from_str(&s) {
2254 base.$key_name = flavor;
2256 return Some(Err(format!(
2257 "'{}' is not a valid value for lld-flavor. \
2258 Use 'darwin', 'gnu', 'link' or 'wasm.",
2262 })).unwrap_or(Ok(()))
2264 ($key_name:ident = $json_name:expr, LinkerFlavor) => ( {
2265 let name = $json_name;
2266 obj.remove(name).and_then(|o| o.as_str().and_then(|s| {
2267 match LinkerFlavorCli::from_str(s) {
2268 Some(linker_flavor) => base.$key_name = linker_flavor,
2269 _ => return Some(Err(format!("'{}' is not a valid value for linker-flavor. \
2270 Use {}", s, LinkerFlavorCli::one_of()))),
2273 })).unwrap_or(Ok(()))
2275 ($key_name:ident, StackProbeType) => ( {
2276 let name = (stringify!($key_name)).replace("_", "-");
2277 obj.remove(&name).and_then(|o| match StackProbeType::from_json(&o) {
2283 format!("`{:?}` is not a valid value for `{}`: {}", o, name, s)
2285 }).unwrap_or(Ok(()))
2287 ($key_name:ident, SanitizerSet) => ( {
2288 let name = (stringify!($key_name)).replace("_", "-");
2289 if let Some(o) = obj.remove(&name) {
2290 if let Some(a) = o.as_array() {
2292 base.$key_name |= match s.as_str() {
2293 Some("address") => SanitizerSet::ADDRESS,
2294 Some("cfi") => SanitizerSet::CFI,
2295 Some("leak") => SanitizerSet::LEAK,
2296 Some("memory") => SanitizerSet::MEMORY,
2297 Some("memtag") => SanitizerSet::MEMTAG,
2298 Some("shadow-call-stack") => SanitizerSet::SHADOWCALLSTACK,
2299 Some("thread") => SanitizerSet::THREAD,
2300 Some("hwaddress") => SanitizerSet::HWADDRESS,
2301 Some(s) => return Err(format!("unknown sanitizer {}", s)),
2302 _ => return Err(format!("not a string: {:?}", s)),
2306 incorrect_type.push(name)
2309 Ok::<(), String>(())
2312 ($key_name:ident = $json_name:expr, link_self_contained) => ( {
2313 let name = $json_name;
2314 obj.remove(name).and_then(|o| o.as_str().and_then(|s| {
2315 match s.parse::<LinkSelfContainedDefault>() {
2316 Ok(lsc_default) => base.$key_name = lsc_default,
2317 _ => return Some(Err(format!("'{}' is not a valid `-Clink-self-contained` default. \
2318 Use 'false', 'true', 'musl' or 'mingw'", s))),
2321 })).unwrap_or(Ok(()))
2323 ($key_name:ident = $json_name:expr, link_objects) => ( {
2324 let name = $json_name;
2325 if let Some(val) = obj.remove(name) {
2326 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
2327 JSON object with fields per CRT object kind.", name))?;
2328 let mut args = CrtObjects::new();
2330 let kind = LinkOutputKind::from_str(&k).ok_or_else(|| {
2331 format!("{}: '{}' is not a valid value for CRT object kind. \
2332 Use '(dynamic,static)-(nopic,pic)-exe' or \
2333 '(dynamic,static)-dylib' or 'wasi-reactor-exe'", name, k)
2336 let v = v.as_array().ok_or_else(||
2337 format!("{}.{}: expected a JSON array", name, k)
2338 )?.iter().enumerate()
2340 let s = s.as_str().ok_or_else(||
2341 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
2342 Ok(s.to_string().into())
2344 .collect::<Result<Vec<_>, String>>()?;
2346 args.insert(kind, v);
2348 base.$key_name = args;
2351 ($key_name:ident = $json_name:expr, link_args) => ( {
2352 let name = $json_name;
2353 if let Some(val) = obj.remove(name) {
2354 let obj = val.as_object().ok_or_else(|| format!("{}: expected a \
2355 JSON object with fields per linker-flavor.", name))?;
2356 let mut args = LinkArgsCli::new();
2358 let flavor = LinkerFlavorCli::from_str(&k).ok_or_else(|| {
2359 format!("{}: '{}' is not a valid value for linker-flavor. \
2360 Use 'em', 'gcc', 'ld' or 'msvc'", name, k)
2363 let v = v.as_array().ok_or_else(||
2364 format!("{}.{}: expected a JSON array", name, k)
2365 )?.iter().enumerate()
2367 let s = s.as_str().ok_or_else(||
2368 format!("{}.{}[{}]: expected a JSON string", name, k, i))?;
2369 Ok(s.to_string().into())
2371 .collect::<Result<Vec<_>, String>>()?;
2373 args.insert(flavor, v);
2375 base.$key_name = args;
2378 ($key_name:ident, env) => ( {
2379 let name = (stringify!($key_name)).replace("_", "-");
2380 if let Some(o) = obj.remove(&name) {
2381 if let Some(a) = o.as_array() {
2383 if let Some(s) = o.as_str() {
2384 let p = s.split('=').collect::<Vec<_>>();
2386 let k = p[0].to_string();
2387 let v = p[1].to_string();
2388 base.$key_name.to_mut().push((k.into(), v.into()));
2393 incorrect_type.push(name)
2397 ($key_name:ident, Option<Abi>) => ( {
2398 let name = (stringify!($key_name)).replace("_", "-");
2399 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2400 match lookup_abi(s) {
2401 Some(abi) => base.$key_name = Some(abi),
2402 _ => return Some(Err(format!("'{}' is not a valid value for abi", s))),
2405 })).unwrap_or(Ok(()))
2407 ($key_name:ident, TargetFamilies) => ( {
2408 if let Some(value) = obj.remove("target-family") {
2409 if let Some(v) = value.as_array() {
2410 base.$key_name = v.iter()
2411 .map(|a| a.as_str().unwrap().to_string().into())
2413 } else if let Some(v) = value.as_str() {
2414 base.$key_name = vec![v.to_string().into()].into();
2418 ($key_name:ident, Conv) => ( {
2419 let name = (stringify!($key_name)).replace("_", "-");
2420 obj.remove(&name).and_then(|o| o.as_str().and_then(|s| {
2421 match Conv::from_str(s) {
2426 Err(e) => Some(Err(e))
2428 })).unwrap_or(Ok(()))
2432 if let Some(j) = obj.remove("target-endian") {
2433 if let Some(s) = j.as_str() {
2434 base.endian = s.parse()?;
2436 incorrect_type.push("target-endian".into())
2440 if let Some(fp) = obj.remove("frame-pointer") {
2441 if let Some(s) = fp.as_str() {
2442 base.frame_pointer = s
2444 .map_err(|()| format!("'{}' is not a valid value for frame-pointer", s))?;
2446 incorrect_type.push("frame-pointer".into())
2450 key!(is_builtin, bool);
2451 key!(c_int_width = "target-c-int-width");
2456 key!(linker, optional);
2457 key!(linker_flavor_json = "linker-flavor", LinkerFlavor)?;
2458 key!(lld_flavor_json = "lld-flavor", LldFlavor)?;
2459 key!(linker_is_gnu_json = "linker-is-gnu", bool);
2460 key!(pre_link_objects = "pre-link-objects", link_objects);
2461 key!(post_link_objects = "post-link-objects", link_objects);
2462 key!(pre_link_objects_self_contained = "pre-link-objects-fallback", link_objects);
2463 key!(post_link_objects_self_contained = "post-link-objects-fallback", link_objects);
2464 key!(link_self_contained = "crt-objects-fallback", link_self_contained)?;
2465 key!(pre_link_args_json = "pre-link-args", link_args);
2466 key!(late_link_args_json = "late-link-args", link_args);
2467 key!(late_link_args_dynamic_json = "late-link-args-dynamic", link_args);
2468 key!(late_link_args_static_json = "late-link-args-static", link_args);
2469 key!(post_link_args_json = "post-link-args", link_args);
2470 key!(link_script, optional);
2471 key!(link_env, env);
2472 key!(link_env_remove, list);
2473 key!(asm_args, list);
2476 key!(dynamic_linking, bool);
2477 key!(only_cdylib, bool);
2478 key!(executables, bool);
2479 key!(relocation_model, RelocModel)?;
2480 key!(code_model, CodeModel)?;
2481 key!(tls_model, TlsModel)?;
2482 key!(disable_redzone, bool);
2483 key!(function_sections, bool);
2487 key!(staticlib_prefix);
2488 key!(staticlib_suffix);
2489 key!(families, TargetFamilies);
2490 key!(abi_return_struct_as_int, bool);
2491 key!(is_like_osx, bool);
2492 key!(is_like_solaris, bool);
2493 key!(is_like_windows, bool);
2494 key!(is_like_msvc, bool);
2495 key!(is_like_wasm, bool);
2496 key!(is_like_android, bool);
2497 key!(default_dwarf_version, u32);
2498 key!(allows_weak_linkage, bool);
2499 key!(has_rpath, bool);
2500 key!(no_default_libraries, bool);
2501 key!(position_independent_executables, bool);
2502 key!(static_position_independent_executables, bool);
2503 key!(needs_plt, bool);
2504 key!(relro_level, RelroLevel)?;
2505 key!(archive_format);
2506 key!(allow_asm, bool);
2507 key!(main_needs_argc_argv, bool);
2508 key!(has_thread_local, bool);
2509 key!(obj_is_bitcode, bool);
2510 key!(forces_embed_bitcode, bool);
2511 key!(bitcode_llvm_cmdline);
2512 key!(max_atomic_width, Option<u64>);
2513 key!(min_atomic_width, Option<u64>);
2514 key!(atomic_cas, bool);
2515 key!(panic_strategy, PanicStrategy)?;
2516 key!(crt_static_allows_dylibs, bool);
2517 key!(crt_static_default, bool);
2518 key!(crt_static_respected, bool);
2519 key!(stack_probes, StackProbeType)?;
2520 key!(min_global_align, Option<u64>);
2521 key!(default_codegen_units, Option<u64>);
2522 key!(trap_unreachable, bool);
2523 key!(requires_lto, bool);
2524 key!(singlethread, bool);
2525 key!(no_builtins, bool);
2526 key!(default_hidden_visibility, bool);
2527 key!(emit_debug_gdb_scripts, bool);
2528 key!(requires_uwtable, bool);
2529 key!(default_uwtable, bool);
2530 key!(simd_types_indirect, bool);
2531 key!(limit_rdylib_exports, bool);
2532 key!(override_export_symbols, opt_list);
2533 key!(merge_functions, MergeFunctions)?;
2534 key!(mcount = "target-mcount");
2536 key!(relax_elf_relocations, bool);
2537 key!(llvm_args, list);
2538 key!(use_ctors_section, bool);
2539 key!(eh_frame_header, bool);
2540 key!(has_thumb_interworking, bool);
2541 key!(debuginfo_kind, DebuginfoKind)?;
2542 key!(split_debuginfo, SplitDebuginfo)?;
2543 key!(supported_split_debuginfo, falliable_list)?;
2544 key!(supported_sanitizers, SanitizerSet)?;
2545 key!(default_adjusted_cabi, Option<Abi>)?;
2546 key!(c_enum_min_bits, u64);
2547 key!(generate_arange_section, bool);
2548 key!(supports_stack_protector, bool);
2550 key!(entry_abi, Conv)?;
2552 if base.is_builtin {
2553 // This can cause unfortunate ICEs later down the line.
2554 return Err("may not set is_builtin for targets not built-in".into());
2556 base.update_from_cli();
2558 // Each field should have been read using `Json::remove` so any keys remaining are unused.
2559 let remaining_keys = obj.keys();
2562 TargetWarnings { unused_fields: remaining_keys.cloned().collect(), incorrect_type },
2566 /// Load a built-in target
2567 pub fn expect_builtin(target_triple: &TargetTriple) -> Target {
2568 match *target_triple {
2569 TargetTriple::TargetTriple(ref target_triple) => {
2570 load_builtin(target_triple).expect("built-in target")
2572 TargetTriple::TargetJson { .. } => {
2573 panic!("built-in targets doesn't support target-paths")
2578 /// Search for a JSON file specifying the given target triple.
2580 /// If none is found in `$RUST_TARGET_PATH`, look for a file called `target.json` inside the
2581 /// sysroot under the target-triple's `rustlib` directory. Note that it could also just be a
2582 /// bare filename already, so also check for that. If one of the hardcoded targets we know
2583 /// about, just return it directly.
2585 /// The error string could come from any of the APIs called, including filesystem access and
2588 target_triple: &TargetTriple,
2590 ) -> Result<(Target, TargetWarnings), String> {
2594 fn load_file(path: &Path) -> Result<(Target, TargetWarnings), String> {
2595 let contents = fs::read_to_string(path).map_err(|e| e.to_string())?;
2596 let obj = serde_json::from_str(&contents).map_err(|e| e.to_string())?;
2597 Target::from_json(obj)
2600 match *target_triple {
2601 TargetTriple::TargetTriple(ref target_triple) => {
2602 // check if triple is in list of built-in targets
2603 if let Some(t) = load_builtin(target_triple) {
2604 return Ok((t, TargetWarnings::empty()));
2607 // search for a file named `target_triple`.json in RUST_TARGET_PATH
2609 let mut target = target_triple.to_string();
2610 target.push_str(".json");
2611 PathBuf::from(target)
2614 let target_path = env::var_os("RUST_TARGET_PATH").unwrap_or_default();
2616 for dir in env::split_paths(&target_path) {
2617 let p = dir.join(&path);
2619 return load_file(&p);
2623 // Additionally look in the sysroot under `lib/rustlib/<triple>/target.json`
2625 let rustlib_path = crate::target_rustlib_path(&sysroot, &target_triple);
2626 let p = PathBuf::from_iter([
2628 Path::new(&rustlib_path),
2629 Path::new("target.json"),
2632 return load_file(&p);
2635 Err(format!("Could not find specification for target {:?}", target_triple))
2637 TargetTriple::TargetJson { ref contents, .. } => {
2638 let obj = serde_json::from_str(contents).map_err(|e| e.to_string())?;
2639 Target::from_json(obj)
2645 impl ToJson for Target {
2646 fn to_json(&self) -> Json {
2647 let mut d = serde_json::Map::new();
2648 let default: TargetOptions = Default::default();
2649 let mut target = self.clone();
2650 target.update_to_cli();
2652 macro_rules! target_val {
2654 let name = (stringify!($attr)).replace("_", "-");
2655 d.insert(name, target.$attr.to_json());
2659 macro_rules! target_option_val {
2661 let name = (stringify!($attr)).replace("_", "-");
2662 if default.$attr != target.$attr {
2663 d.insert(name, target.$attr.to_json());
2666 ($attr:ident, $json_name:expr) => {{
2667 let name = $json_name;
2668 if default.$attr != target.$attr {
2669 d.insert(name.into(), target.$attr.to_json());
2672 (link_args - $attr:ident, $json_name:expr) => {{
2673 let name = $json_name;
2674 if default.$attr != target.$attr {
2678 .map(|(k, v)| (k.desc().to_string(), v.clone()))
2679 .collect::<BTreeMap<_, _>>();
2680 d.insert(name.to_string(), obj.to_json());
2683 (env - $attr:ident) => {{
2684 let name = (stringify!($attr)).replace("_", "-");
2685 if default.$attr != target.$attr {
2689 .map(|&(ref k, ref v)| format!("{k}={v}"))
2690 .collect::<Vec<_>>();
2691 d.insert(name, obj.to_json());
2696 target_val!(llvm_target);
2697 d.insert("target-pointer-width".to_string(), self.pointer_width.to_string().to_json());
2699 target_val!(data_layout);
2701 target_option_val!(is_builtin);
2702 target_option_val!(endian, "target-endian");
2703 target_option_val!(c_int_width, "target-c-int-width");
2704 target_option_val!(os);
2705 target_option_val!(env);
2706 target_option_val!(abi);
2707 target_option_val!(vendor);
2708 target_option_val!(linker);
2709 target_option_val!(linker_flavor_json, "linker-flavor");
2710 target_option_val!(lld_flavor_json, "lld-flavor");
2711 target_option_val!(linker_is_gnu_json, "linker-is-gnu");
2712 target_option_val!(pre_link_objects);
2713 target_option_val!(post_link_objects);
2714 target_option_val!(pre_link_objects_self_contained, "pre-link-objects-fallback");
2715 target_option_val!(post_link_objects_self_contained, "post-link-objects-fallback");
2716 target_option_val!(link_self_contained, "crt-objects-fallback");
2717 target_option_val!(link_args - pre_link_args_json, "pre-link-args");
2718 target_option_val!(link_args - late_link_args_json, "late-link-args");
2719 target_option_val!(link_args - late_link_args_dynamic_json, "late-link-args-dynamic");
2720 target_option_val!(link_args - late_link_args_static_json, "late-link-args-static");
2721 target_option_val!(link_args - post_link_args_json, "post-link-args");
2722 target_option_val!(link_script);
2723 target_option_val!(env - link_env);
2724 target_option_val!(link_env_remove);
2725 target_option_val!(asm_args);
2726 target_option_val!(cpu);
2727 target_option_val!(features);
2728 target_option_val!(dynamic_linking);
2729 target_option_val!(only_cdylib);
2730 target_option_val!(executables);
2731 target_option_val!(relocation_model);
2732 target_option_val!(code_model);
2733 target_option_val!(tls_model);
2734 target_option_val!(disable_redzone);
2735 target_option_val!(frame_pointer);
2736 target_option_val!(function_sections);
2737 target_option_val!(dll_prefix);
2738 target_option_val!(dll_suffix);
2739 target_option_val!(exe_suffix);
2740 target_option_val!(staticlib_prefix);
2741 target_option_val!(staticlib_suffix);
2742 target_option_val!(families, "target-family");
2743 target_option_val!(abi_return_struct_as_int);
2744 target_option_val!(is_like_osx);
2745 target_option_val!(is_like_solaris);
2746 target_option_val!(is_like_windows);
2747 target_option_val!(is_like_msvc);
2748 target_option_val!(is_like_wasm);
2749 target_option_val!(is_like_android);
2750 target_option_val!(default_dwarf_version);
2751 target_option_val!(allows_weak_linkage);
2752 target_option_val!(has_rpath);
2753 target_option_val!(no_default_libraries);
2754 target_option_val!(position_independent_executables);
2755 target_option_val!(static_position_independent_executables);
2756 target_option_val!(needs_plt);
2757 target_option_val!(relro_level);
2758 target_option_val!(archive_format);
2759 target_option_val!(allow_asm);
2760 target_option_val!(main_needs_argc_argv);
2761 target_option_val!(has_thread_local);
2762 target_option_val!(obj_is_bitcode);
2763 target_option_val!(forces_embed_bitcode);
2764 target_option_val!(bitcode_llvm_cmdline);
2765 target_option_val!(min_atomic_width);
2766 target_option_val!(max_atomic_width);
2767 target_option_val!(atomic_cas);
2768 target_option_val!(panic_strategy);
2769 target_option_val!(crt_static_allows_dylibs);
2770 target_option_val!(crt_static_default);
2771 target_option_val!(crt_static_respected);
2772 target_option_val!(stack_probes);
2773 target_option_val!(min_global_align);
2774 target_option_val!(default_codegen_units);
2775 target_option_val!(trap_unreachable);
2776 target_option_val!(requires_lto);
2777 target_option_val!(singlethread);
2778 target_option_val!(no_builtins);
2779 target_option_val!(default_hidden_visibility);
2780 target_option_val!(emit_debug_gdb_scripts);
2781 target_option_val!(requires_uwtable);
2782 target_option_val!(default_uwtable);
2783 target_option_val!(simd_types_indirect);
2784 target_option_val!(limit_rdylib_exports);
2785 target_option_val!(override_export_symbols);
2786 target_option_val!(merge_functions);
2787 target_option_val!(mcount, "target-mcount");
2788 target_option_val!(llvm_abiname);
2789 target_option_val!(relax_elf_relocations);
2790 target_option_val!(llvm_args);
2791 target_option_val!(use_ctors_section);
2792 target_option_val!(eh_frame_header);
2793 target_option_val!(has_thumb_interworking);
2794 target_option_val!(debuginfo_kind);
2795 target_option_val!(split_debuginfo);
2796 target_option_val!(supported_split_debuginfo);
2797 target_option_val!(supported_sanitizers);
2798 target_option_val!(c_enum_min_bits);
2799 target_option_val!(generate_arange_section);
2800 target_option_val!(supports_stack_protector);
2801 target_option_val!(entry_name);
2802 target_option_val!(entry_abi);
2804 if let Some(abi) = self.default_adjusted_cabi {
2805 d.insert("default-adjusted-cabi".into(), Abi::name(abi).to_json());
2812 /// Either a target triple string or a path to a JSON file.
2813 #[derive(Clone, Debug)]
2814 pub enum TargetTriple {
2815 TargetTriple(String),
2817 /// Warning: This field may only be used by rustdoc. Using it anywhere else will lead to
2818 /// inconsistencies as it is discarded during serialization.
2819 path_for_rustdoc: PathBuf,
2825 // Use a manual implementation to ignore the path field
2826 impl PartialEq for TargetTriple {
2827 fn eq(&self, other: &Self) -> bool {
2828 match (self, other) {
2829 (Self::TargetTriple(l0), Self::TargetTriple(r0)) => l0 == r0,
2831 Self::TargetJson { path_for_rustdoc: _, triple: l_triple, contents: l_contents },
2832 Self::TargetJson { path_for_rustdoc: _, triple: r_triple, contents: r_contents },
2833 ) => l_triple == r_triple && l_contents == r_contents,
2839 // Use a manual implementation to ignore the path field
2840 impl Hash for TargetTriple {
2841 fn hash<H: Hasher>(&self, state: &mut H) -> () {
2843 TargetTriple::TargetTriple(triple) => {
2847 TargetTriple::TargetJson { path_for_rustdoc: _, triple, contents } => {
2850 contents.hash(state)
2856 // Use a manual implementation to prevent encoding the target json file path in the crate metadata
2857 impl<S: Encoder> Encodable<S> for TargetTriple {
2858 fn encode(&self, s: &mut S) {
2860 TargetTriple::TargetTriple(triple) => s.emit_enum_variant(0, |s| s.emit_str(triple)),
2861 TargetTriple::TargetJson { path_for_rustdoc: _, triple, contents } => s
2862 .emit_enum_variant(1, |s| {
2864 s.emit_str(contents)
2870 impl<D: Decoder> Decodable<D> for TargetTriple {
2871 fn decode(d: &mut D) -> Self {
2872 match d.read_usize() {
2873 0 => TargetTriple::TargetTriple(d.read_str().to_owned()),
2874 1 => TargetTriple::TargetJson {
2875 path_for_rustdoc: PathBuf::new(),
2876 triple: d.read_str().to_owned(),
2877 contents: d.read_str().to_owned(),
2880 panic!("invalid enum variant tag while decoding `TargetTriple`, expected 0..2");
2887 /// Creates a target triple from the passed target triple string.
2888 pub fn from_triple(triple: &str) -> Self {
2889 TargetTriple::TargetTriple(triple.into())
2892 /// Creates a target triple from the passed target path.
2893 pub fn from_path(path: &Path) -> Result<Self, io::Error> {
2894 let canonicalized_path = path.canonicalize()?;
2895 let contents = std::fs::read_to_string(&canonicalized_path).map_err(|err| {
2897 io::ErrorKind::InvalidInput,
2898 format!("target path {:?} is not a valid file: {}", canonicalized_path, err),
2901 let triple = canonicalized_path
2903 .expect("target path must not be empty")
2905 .expect("target path must be valid unicode")
2907 Ok(TargetTriple::TargetJson { path_for_rustdoc: canonicalized_path, triple, contents })
2910 /// Returns a string triple for this target.
2912 /// If this target is a path, the file name (without extension) is returned.
2913 pub fn triple(&self) -> &str {
2915 TargetTriple::TargetTriple(ref triple)
2916 | TargetTriple::TargetJson { ref triple, .. } => triple,
2920 /// Returns an extended string triple for this target.
2922 /// If this target is a path, a hash of the path is appended to the triple returned
2924 pub fn debug_triple(&self) -> String {
2925 use std::collections::hash_map::DefaultHasher;
2928 TargetTriple::TargetTriple(triple) => triple.to_owned(),
2929 TargetTriple::TargetJson { path_for_rustdoc: _, triple, contents: content } => {
2930 let mut hasher = DefaultHasher::new();
2931 content.hash(&mut hasher);
2932 let hash = hasher.finish();
2933 format!("{}-{}", triple, hash)
2939 impl fmt::Display for TargetTriple {
2940 fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
2941 write!(f, "{}", self.debug_triple())