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mod.rs
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//! [Flexible target specification.](https://github.com/rust-lang/rfcs/pull/131)
//!
//! Rust targets a wide variety of usecases, and in the interest of flexibility,
//! allows new target triples to be defined in configuration files. Most users
//! will not need to care about these, but this is invaluable when porting Rust
//! to a new platform, and allows for an unprecedented level of control over how
//! the compiler works.
//!
//! # Using custom targets
//!
//! A target triple, as passed via `rustc --target=TRIPLE`, will first be
//! compared against the list of built-in targets. This is to ease distributing
//! rustc (no need for configuration files) and also to hold these built-in
//! targets as immutable and sacred. If `TRIPLE` is not one of the built-in
//! targets, rustc will check if a file named `TRIPLE` exists. If it does, it
//! will be loaded as the target configuration. If the file does not exist,
//! rustc will search each directory in the environment variable
//! `RUST_TARGET_PATH` for a file named `TRIPLE.json`. The first one found will
//! be loaded. If no file is found in any of those directories, a fatal error
//! will be given.
//!
//! Projects defining their own targets should use
//! `--target=path/to/my-awesome-platform.json` instead of adding to
//! `RUST_TARGET_PATH`.
//!
//! # Defining a new target
//!
//! Targets are defined using [JSON](http://json.org/). The `Target` struct in
//! this module defines the format the JSON file should take, though each
//! underscore in the field names should be replaced with a hyphen (`-`) in the
//! JSON file. Some fields are required in every target specification, such as
//! `llvm-target`, `target-endian`, `target-pointer-width`, `data-layout`,
//! `arch`, and `os`. In general, options passed to rustc with `-C` override
//! the target's settings, though `target-feature` and `link-args` will *add*
//! to the list specified by the target, rather than replace.
use serialize::json::{Json, ToJson};
use std::collections::BTreeMap;
use std::default::Default;
use std::{fmt, io};
use std::path::{Path, PathBuf};
use std::str::FromStr;
use crate::spec::abi::{Abi, lookup as lookup_abi};
pub mod abi;
mod android_base;
mod apple_base;
mod apple_ios_base;
mod arm_base;
mod cloudabi_base;
mod dragonfly_base;
mod freebsd_base;
mod haiku_base;
mod hermit_base;
mod linux_base;
mod linux_musl_base;
mod openbsd_base;
mod netbsd_base;
mod solaris_base;
mod uefi_base;
mod windows_base;
mod windows_msvc_base;
mod thumb_base;
mod l4re_base;
mod fuchsia_base;
mod redox_base;
mod riscv_base;
mod wasm32_base;
#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd, Hash,
RustcEncodable, RustcDecodable)]
pub enum LinkerFlavor {
Em,
Gcc,
Ld,
Msvc,
Lld(LldFlavor),
PtxLinker,
}
#[derive(Clone, Copy, Debug, Eq, Ord, PartialEq, PartialOrd, Hash,
RustcEncodable, RustcDecodable)]
pub enum LldFlavor {
Wasm,
Ld64,
Ld,
Link,
}
impl LldFlavor {
fn from_str(s: &str) -> Option<Self> {
Some(match s {
"darwin" => LldFlavor::Ld64,
"gnu" => LldFlavor::Ld,
"link" => LldFlavor::Link,
"wasm" => LldFlavor::Wasm,
_ => return None,
})
}
}
impl ToJson for LldFlavor {
fn to_json(&self) -> Json {
match *self {
LldFlavor::Ld64 => "darwin",
LldFlavor::Ld => "gnu",
LldFlavor::Link => "link",
LldFlavor::Wasm => "wasm",
}.to_json()
}
}
impl ToJson for LinkerFlavor {
fn to_json(&self) -> Json {
self.desc().to_json()
}
}
macro_rules! flavor_mappings {
($((($($flavor:tt)*), $string:expr),)*) => (
impl LinkerFlavor {
pub const fn one_of() -> &'static str {
concat!("one of: ", $($string, " ",)*)
}
pub fn from_str(s: &str) -> Option<Self> {
Some(match s {
$($string => $($flavor)*,)*
_ => return None,
})
}
pub fn desc(&self) -> &str {
match *self {
$($($flavor)* => $string,)*
}
}
}
)
}
flavor_mappings! {
((LinkerFlavor::Em), "em"),
((LinkerFlavor::Gcc), "gcc"),
((LinkerFlavor::Ld), "ld"),
((LinkerFlavor::Msvc), "msvc"),
((LinkerFlavor::PtxLinker), "ptx-linker"),
((LinkerFlavor::Lld(LldFlavor::Wasm)), "wasm-ld"),
((LinkerFlavor::Lld(LldFlavor::Ld64)), "ld64.lld"),
((LinkerFlavor::Lld(LldFlavor::Ld)), "ld.lld"),
((LinkerFlavor::Lld(LldFlavor::Link)), "lld-link"),
}
#[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
pub enum PanicStrategy {
Unwind,
Abort,
}
impl PanicStrategy {
pub fn desc(&self) -> &str {
match *self {
PanicStrategy::Unwind => "unwind",
PanicStrategy::Abort => "abort",
}
}
}
impl ToJson for PanicStrategy {
fn to_json(&self) -> Json {
match *self {
PanicStrategy::Abort => "abort".to_json(),
PanicStrategy::Unwind => "unwind".to_json(),
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
pub enum RelroLevel {
Full,
Partial,
Off,
None,
}
impl RelroLevel {
pub fn desc(&self) -> &str {
match *self {
RelroLevel::Full => "full",
RelroLevel::Partial => "partial",
RelroLevel::Off => "off",
RelroLevel::None => "none",
}
}
}
impl FromStr for RelroLevel {
type Err = ();
fn from_str(s: &str) -> Result<RelroLevel, ()> {
match s {
"full" => Ok(RelroLevel::Full),
"partial" => Ok(RelroLevel::Partial),
"off" => Ok(RelroLevel::Off),
"none" => Ok(RelroLevel::None),
_ => Err(()),
}
}
}
impl ToJson for RelroLevel {
fn to_json(&self) -> Json {
match *self {
RelroLevel::Full => "full".to_json(),
RelroLevel::Partial => "partial".to_json(),
RelroLevel::Off => "off".to_json(),
RelroLevel::None => "None".to_json(),
}
}
}
#[derive(Clone, Copy, Debug, PartialEq, Hash, RustcEncodable, RustcDecodable)]
pub enum MergeFunctions {
Disabled,
Trampolines,
Aliases
}
impl MergeFunctions {
pub fn desc(&self) -> &str {
match *self {
MergeFunctions::Disabled => "disabled",
MergeFunctions::Trampolines => "trampolines",
MergeFunctions::Aliases => "aliases",
}
}
}
impl FromStr for MergeFunctions {
type Err = ();
fn from_str(s: &str) -> Result<MergeFunctions, ()> {
match s {
"disabled" => Ok(MergeFunctions::Disabled),
"trampolines" => Ok(MergeFunctions::Trampolines),
"aliases" => Ok(MergeFunctions::Aliases),
_ => Err(()),
}
}
}
impl ToJson for MergeFunctions {
fn to_json(&self) -> Json {
match *self {
MergeFunctions::Disabled => "disabled".to_json(),
MergeFunctions::Trampolines => "trampolines".to_json(),
MergeFunctions::Aliases => "aliases".to_json(),
}
}
}
pub enum LoadTargetError {
BuiltinTargetNotFound(String),
Other(String),
}
pub type LinkArgs = BTreeMap<LinkerFlavor, Vec<String>>;
pub type TargetResult = Result<Target, String>;
macro_rules! supported_targets {
( $(($( $triple:literal, )+ $module:ident ),)+ ) => {
$(mod $module;)+
/// List of supported targets
const TARGETS: &[&str] = &[$($($triple),+),+];
fn load_specific(target: &str) -> Result<Target, LoadTargetError> {
match target {
$(
$($triple)|+ => {
let mut t = $module::target()
.map_err(LoadTargetError::Other)?;
t.options.is_builtin = true;
// round-trip through the JSON parser to ensure at
// run-time that the parser works correctly
t = Target::from_json(t.to_json())
.map_err(LoadTargetError::Other)?;
debug!("Got builtin target: {:?}", t);
Ok(t)
},
)+
_ => Err(LoadTargetError::BuiltinTargetNotFound(
format!("Unable to find target: {}", target)))
}
}
pub fn get_targets() -> impl Iterator<Item = String> {
TARGETS.iter().filter_map(|t| -> Option<String> {
load_specific(t)
.and(Ok(t.to_string()))
.ok()
})
}
#[cfg(test)]
mod test_json_encode_decode {
use serialize::json::ToJson;
use super::Target;
$(use super::$module;)+
$(
#[test]
fn $module() {
// Grab the TargetResult struct. If we successfully retrieved
// a Target, then the test JSON encoding/decoding can run for this
// Target on this testing platform (i.e., checking the iOS targets
// only on a Mac test platform).
let _ = $module::target().map(|original| {
let as_json = original.to_json();
let parsed = Target::from_json(as_json).unwrap();
assert_eq!(original, parsed);
});
}
)+
}
};
}
supported_targets! {
("x86_64-unknown-linux-gnu", x86_64_unknown_linux_gnu),
("x86_64-unknown-linux-gnux32", x86_64_unknown_linux_gnux32),
("i686-unknown-linux-gnu", i686_unknown_linux_gnu),
("i586-unknown-linux-gnu", i586_unknown_linux_gnu),
("mips-unknown-linux-gnu", mips_unknown_linux_gnu),
("mips64-unknown-linux-gnuabi64", mips64_unknown_linux_gnuabi64),
("mips64el-unknown-linux-gnuabi64", mips64el_unknown_linux_gnuabi64),
("mipsisa32r6-unknown-linux-gnu", mipsisa32r6_unknown_linux_gnu),
("mipsisa32r6el-unknown-linux-gnu", mipsisa32r6el_unknown_linux_gnu),
("mipsisa64r6-unknown-linux-gnuabi64", mipsisa64r6_unknown_linux_gnuabi64),
("mipsisa64r6el-unknown-linux-gnuabi64", mipsisa64r6el_unknown_linux_gnuabi64),
("mipsel-unknown-linux-gnu", mipsel_unknown_linux_gnu),
("powerpc-unknown-linux-gnu", powerpc_unknown_linux_gnu),
("powerpc-unknown-linux-gnuspe", powerpc_unknown_linux_gnuspe),
("powerpc-unknown-linux-musl", powerpc_unknown_linux_musl),
("powerpc64-unknown-linux-gnu", powerpc64_unknown_linux_gnu),
("powerpc64-unknown-linux-musl", powerpc64_unknown_linux_musl),
("powerpc64le-unknown-linux-gnu", powerpc64le_unknown_linux_gnu),
("powerpc64le-unknown-linux-musl", powerpc64le_unknown_linux_musl),
("s390x-unknown-linux-gnu", s390x_unknown_linux_gnu),
("sparc-unknown-linux-gnu", sparc_unknown_linux_gnu),
("sparc64-unknown-linux-gnu", sparc64_unknown_linux_gnu),
("arm-unknown-linux-gnueabi", arm_unknown_linux_gnueabi),
("arm-unknown-linux-gnueabihf", arm_unknown_linux_gnueabihf),
("arm-unknown-linux-musleabi", arm_unknown_linux_musleabi),
("arm-unknown-linux-musleabihf", arm_unknown_linux_musleabihf),
("armv4t-unknown-linux-gnueabi", armv4t_unknown_linux_gnueabi),
("armv5te-unknown-linux-gnueabi", armv5te_unknown_linux_gnueabi),
("armv5te-unknown-linux-musleabi", armv5te_unknown_linux_musleabi),
("armv7-unknown-linux-gnueabihf", armv7_unknown_linux_gnueabihf),
("thumbv7neon-unknown-linux-gnueabihf", thumbv7neon_unknown_linux_gnueabihf),
("armv7-unknown-linux-musleabihf", armv7_unknown_linux_musleabihf),
("aarch64-unknown-linux-gnu", aarch64_unknown_linux_gnu),
("aarch64-unknown-linux-musl", aarch64_unknown_linux_musl),
("x86_64-unknown-linux-musl", x86_64_unknown_linux_musl),
("i686-unknown-linux-musl", i686_unknown_linux_musl),
("i586-unknown-linux-musl", i586_unknown_linux_musl),
("mips-unknown-linux-musl", mips_unknown_linux_musl),
("mipsel-unknown-linux-musl", mipsel_unknown_linux_musl),
("mips-unknown-linux-uclibc", mips_unknown_linux_uclibc),
("mipsel-unknown-linux-uclibc", mipsel_unknown_linux_uclibc),
("i686-linux-android", i686_linux_android),
("x86_64-linux-android", x86_64_linux_android),
("arm-linux-androideabi", arm_linux_androideabi),
("armv7-linux-androideabi", armv7_linux_androideabi),
("thumbv7neon-linux-androideabi", thumbv7neon_linux_androideabi),
("aarch64-linux-android", aarch64_linux_android),
("aarch64-unknown-freebsd", aarch64_unknown_freebsd),
("armv6-unknown-freebsd", armv6_unknown_freebsd),
("armv7-unknown-freebsd", armv7_unknown_freebsd),
("i686-unknown-freebsd", i686_unknown_freebsd),
("powerpc64-unknown-freebsd", powerpc64_unknown_freebsd),
("x86_64-unknown-freebsd", x86_64_unknown_freebsd),
("i686-unknown-dragonfly", i686_unknown_dragonfly),
("x86_64-unknown-dragonfly", x86_64_unknown_dragonfly),
("aarch64-unknown-openbsd", aarch64_unknown_openbsd),
("i686-unknown-openbsd", i686_unknown_openbsd),
("x86_64-unknown-openbsd", x86_64_unknown_openbsd),
("aarch64-unknown-netbsd", aarch64_unknown_netbsd),
("armv6-unknown-netbsd-eabihf", armv6_unknown_netbsd_eabihf),
("armv7-unknown-netbsd-eabihf", armv7_unknown_netbsd_eabihf),
("i686-unknown-netbsd", i686_unknown_netbsd),
("powerpc-unknown-netbsd", powerpc_unknown_netbsd),
("sparc64-unknown-netbsd", sparc64_unknown_netbsd),
("x86_64-unknown-netbsd", x86_64_unknown_netbsd),
("x86_64-rumprun-netbsd", x86_64_rumprun_netbsd),
("i686-unknown-haiku", i686_unknown_haiku),
("x86_64-unknown-haiku", x86_64_unknown_haiku),
("x86_64-apple-darwin", x86_64_apple_darwin),
("i686-apple-darwin", i686_apple_darwin),
("aarch64-fuchsia", aarch64_fuchsia),
("x86_64-fuchsia", x86_64_fuchsia),
("x86_64-unknown-l4re-uclibc", x86_64_unknown_l4re_uclibc),
("x86_64-unknown-redox", x86_64_unknown_redox),
("i386-apple-ios", i386_apple_ios),
("x86_64-apple-ios", x86_64_apple_ios),
("aarch64-apple-ios", aarch64_apple_ios),
("armv7-apple-ios", armv7_apple_ios),
("armv7s-apple-ios", armv7s_apple_ios),
("armebv7r-none-eabi", armebv7r_none_eabi),
("armebv7r-none-eabihf", armebv7r_none_eabihf),
("armv7r-none-eabi", armv7r_none_eabi),
("armv7r-none-eabihf", armv7r_none_eabihf),
// `x86_64-pc-solaris` is an alias for `x86_64_sun_solaris` for backwards compatibility reasons.
// (See <https://github.com/rust-lang/rust/issues/40531>.)
("x86_64-sun-solaris", "x86_64-pc-solaris", x86_64_sun_solaris),
("sparcv9-sun-solaris", sparcv9_sun_solaris),
("x86_64-pc-windows-gnu", x86_64_pc_windows_gnu),
("i686-pc-windows-gnu", i686_pc_windows_gnu),
("i686-unknown-windows-gnu", i686_unknown_windows_gnu),
("aarch64-pc-windows-msvc", aarch64_pc_windows_msvc),
("x86_64-pc-windows-msvc", x86_64_pc_windows_msvc),
("i686-pc-windows-msvc", i686_pc_windows_msvc),
("i586-pc-windows-msvc", i586_pc_windows_msvc),
("thumbv7a-pc-windows-msvc", thumbv7a_pc_windows_msvc),
("asmjs-unknown-emscripten", asmjs_unknown_emscripten),
("wasm32-unknown-emscripten", wasm32_unknown_emscripten),
("wasm32-unknown-unknown", wasm32_unknown_unknown),
("wasm32-wasi", wasm32_wasi),
("wasm32-experimental-emscripten", wasm32_experimental_emscripten),
("thumbv6m-none-eabi", thumbv6m_none_eabi),
("thumbv7m-none-eabi", thumbv7m_none_eabi),
("thumbv7em-none-eabi", thumbv7em_none_eabi),
("thumbv7em-none-eabihf", thumbv7em_none_eabihf),
("thumbv8m.base-none-eabi", thumbv8m_base_none_eabi),
("thumbv8m.main-none-eabi", thumbv8m_main_none_eabi),
("thumbv8m.main-none-eabihf", thumbv8m_main_none_eabihf),
("msp430-none-elf", msp430_none_elf),
("aarch64-unknown-cloudabi", aarch64_unknown_cloudabi),
("armv7-unknown-cloudabi-eabihf", armv7_unknown_cloudabi_eabihf),
("i686-unknown-cloudabi", i686_unknown_cloudabi),
("x86_64-unknown-cloudabi", x86_64_unknown_cloudabi),
("aarch64-unknown-hermit", aarch64_unknown_hermit),
("x86_64-unknown-hermit", x86_64_unknown_hermit),
("riscv32imc-unknown-none-elf", riscv32imc_unknown_none_elf),
("riscv32imac-unknown-none-elf", riscv32imac_unknown_none_elf),
("riscv64imac-unknown-none-elf", riscv64imac_unknown_none_elf),
("riscv64gc-unknown-none-elf", riscv64gc_unknown_none_elf),
("aarch64-unknown-none", aarch64_unknown_none),
("x86_64-fortanix-unknown-sgx", x86_64_fortanix_unknown_sgx),
("x86_64-unknown-uefi", x86_64_unknown_uefi),
("nvptx64-nvidia-cuda", nvptx64_nvidia_cuda),
}
/// Everything `rustc` knows about how to compile for a specific target.
///
/// Every field here must be specified, and has no default value.
#[derive(PartialEq, Clone, Debug)]
pub struct Target {
/// Target triple to pass to LLVM.
pub llvm_target: String,
/// String to use as the `target_endian` `cfg` variable.
pub target_endian: String,
/// String to use as the `target_pointer_width` `cfg` variable.
pub target_pointer_width: String,
/// Width of c_int type
pub target_c_int_width: String,
/// OS name to use for conditional compilation.
pub target_os: String,
/// Environment name to use for conditional compilation.
pub target_env: String,
/// Vendor name to use for conditional compilation.
pub target_vendor: String,
/// Architecture to use for ABI considerations. Valid options include: "x86",
/// "x86_64", "arm", "aarch64", "mips", "powerpc", "powerpc64", and others.
pub arch: String,
/// [Data layout](http://llvm.org/docs/LangRef.html#data-layout) to pass to LLVM.
pub data_layout: String,
/// Linker flavor
pub linker_flavor: LinkerFlavor,
/// Optional settings with defaults.
pub options: TargetOptions,
}
pub trait HasTargetSpec {
fn target_spec(&self) -> &Target;
}
impl HasTargetSpec for Target {
fn target_spec(&self) -> &Target {
self
}
}
/// Optional aspects of a target specification.
///
/// This has an implementation of `Default`, see each field for what the default is. In general,
/// these try to take "minimal defaults" that don't assume anything about the runtime they run in.
#[derive(PartialEq, Clone, Debug)]
pub struct TargetOptions {
/// Whether the target is built-in or loaded from a custom target specification.
pub is_builtin: bool,
/// Linker to invoke
pub linker: Option<String>,
/// LLD flavor
pub lld_flavor: LldFlavor,
/// Linker arguments that are passed *before* any user-defined libraries.
pub pre_link_args: LinkArgs, // ... unconditionally
pub pre_link_args_crt: LinkArgs, // ... when linking with a bundled crt
/// Objects to link before all others, always found within the
/// sysroot folder.
pub pre_link_objects_exe: Vec<String>, // ... when linking an executable, unconditionally
pub pre_link_objects_exe_crt: Vec<String>, // ... when linking an executable with a bundled crt
pub pre_link_objects_dll: Vec<String>, // ... when linking a dylib
/// Linker arguments that are unconditionally passed after any
/// user-defined but before post_link_objects. Standard platform
/// libraries that should be always be linked to, usually go here.
pub late_link_args: LinkArgs,
/// Objects to link after all others, always found within the
/// sysroot folder.
pub post_link_objects: Vec<String>, // ... unconditionally
pub post_link_objects_crt: Vec<String>, // ... when linking with a bundled crt
/// Linker arguments that are unconditionally passed *after* any
/// user-defined libraries.
pub post_link_args: LinkArgs,
/// Environment variables to be set before invoking the linker.
pub link_env: Vec<(String, String)>,
/// Extra arguments to pass to the external assembler (when used)
pub asm_args: Vec<String>,
/// Default CPU to pass to LLVM. Corresponds to `llc -mcpu=$cpu`. Defaults
/// to "generic".
pub cpu: String,
/// Default target features to pass to LLVM. These features will *always* be
/// passed, and cannot be disabled even via `-C`. Corresponds to `llc
/// -mattr=$features`.
pub features: String,
/// Whether dynamic linking is available on this target. Defaults to false.
pub dynamic_linking: bool,
/// If dynamic linking is available, whether only cdylibs are supported.
pub only_cdylib: bool,
/// Whether executables are available on this target. iOS, for example, only allows static
/// libraries. Defaults to false.
pub executables: bool,
/// Relocation model to use in object file. Corresponds to `llc
/// -relocation-model=$relocation_model`. Defaults to "pic".
pub relocation_model: String,
/// Code model to use. Corresponds to `llc -code-model=$code_model`.
pub code_model: Option<String>,
/// TLS model to use. Options are "global-dynamic" (default), "local-dynamic", "initial-exec"
/// and "local-exec". This is similar to the -ftls-model option in GCC/Clang.
pub tls_model: String,
/// Do not emit code that uses the "red zone", if the ABI has one. Defaults to false.
pub disable_redzone: bool,
/// Eliminate frame pointers from stack frames if possible. Defaults to true.
pub eliminate_frame_pointer: bool,
/// Emit each function in its own section. Defaults to true.
pub function_sections: bool,
/// String to prepend to the name of every dynamic library. Defaults to "lib".
pub dll_prefix: String,
/// String to append to the name of every dynamic library. Defaults to ".so".
pub dll_suffix: String,
/// String to append to the name of every executable.
pub exe_suffix: String,
/// String to prepend to the name of every static library. Defaults to "lib".
pub staticlib_prefix: String,
/// String to append to the name of every static library. Defaults to ".a".
pub staticlib_suffix: String,
/// OS family to use for conditional compilation. Valid options: "unix", "windows".
pub target_family: Option<String>,
/// Whether the target toolchain's ABI supports returning small structs as an integer.
pub abi_return_struct_as_int: bool,
/// Whether the target toolchain is like macOS's. Only useful for compiling against iOS/macOS,
/// in particular running dsymutil and some other stuff like `-dead_strip`. Defaults to false.
pub is_like_osx: bool,
/// Whether the target toolchain is like Solaris's.
/// Only useful for compiling against Illumos/Solaris,
/// as they have a different set of linker flags. Defaults to false.
pub is_like_solaris: bool,
/// Whether the target toolchain is like Windows'. Only useful for compiling against Windows,
/// only really used for figuring out how to find libraries, since Windows uses its own
/// library naming convention. Defaults to false.
pub is_like_windows: bool,
pub is_like_msvc: bool,
/// Whether the target toolchain is like Android's. Only useful for compiling against Android.
/// Defaults to false.
pub is_like_android: bool,
/// Whether the target toolchain is like Emscripten's. Only useful for compiling with
/// Emscripten toolchain.
/// Defaults to false.
pub is_like_emscripten: bool,
/// Whether the target toolchain is like Fuchsia's.
pub is_like_fuchsia: bool,
/// Whether the linker support GNU-like arguments such as -O. Defaults to false.
pub linker_is_gnu: bool,
/// The MinGW toolchain has a known issue that prevents it from correctly
/// handling COFF object files with more than 2<sup>15</sup> sections. Since each weak
/// symbol needs its own COMDAT section, weak linkage implies a large
/// number sections that easily exceeds the given limit for larger
/// codebases. Consequently we want a way to disallow weak linkage on some
/// platforms.
pub allows_weak_linkage: bool,
/// Whether the linker support rpaths or not. Defaults to false.
pub has_rpath: bool,
/// Whether to disable linking to the default libraries, typically corresponds
/// to `-nodefaultlibs`. Defaults to true.
pub no_default_libraries: bool,
/// Dynamically linked executables can be compiled as position independent
/// if the default relocation model of position independent code is not
/// changed. This is a requirement to take advantage of ASLR, as otherwise
/// the functions in the executable are not randomized and can be used
/// during an exploit of a vulnerability in any code.
pub position_independent_executables: bool,
/// Determines if the target always requires using the PLT for indirect
/// library calls or not. This controls the default value of the `-Z plt` flag.
pub needs_plt: bool,
/// Either partial, full, or off. Full RELRO makes the dynamic linker
/// resolve all symbols at startup and marks the GOT read-only before
/// starting the program, preventing overwriting the GOT.
pub relro_level: RelroLevel,
/// Format that archives should be emitted in. This affects whether we use
/// LLVM to assemble an archive or fall back to the system linker, and
/// currently only "gnu" is used to fall into LLVM. Unknown strings cause
/// the system linker to be used.
pub archive_format: String,
/// Is asm!() allowed? Defaults to true.
pub allow_asm: bool,
/// Whether the target uses a custom unwind resumption routine.
/// By default LLVM lowers `resume` instructions into calls to `_Unwind_Resume`
/// defined in libgcc. If this option is enabled, the target must provide
/// `eh_unwind_resume` lang item.
pub custom_unwind_resume: bool,
/// Flag indicating whether ELF TLS (e.g., #[thread_local]) is available for
/// this target.
pub has_elf_tls: bool,
// This is mainly for easy compatibility with emscripten.
// If we give emcc .o files that are actually .bc files it
// will 'just work'.
pub obj_is_bitcode: bool,
// LLVM can't produce object files for this target. Instead, we'll make LLVM
// emit assembly and then use `gcc` to turn that assembly into an object
// file
pub no_integrated_as: bool,
/// Don't use this field; instead use the `.min_atomic_width()` method.
pub min_atomic_width: Option<u64>,
/// Don't use this field; instead use the `.max_atomic_width()` method.
pub max_atomic_width: Option<u64>,
/// Whether the target supports atomic CAS operations natively
pub atomic_cas: bool,
/// Panic strategy: "unwind" or "abort"
pub panic_strategy: PanicStrategy,
/// A blacklist of ABIs unsupported by the current target. Note that generic
/// ABIs are considered to be supported on all platforms and cannot be blacklisted.
pub abi_blacklist: Vec<Abi>,
/// Whether or not linking dylibs to a static CRT is allowed.
pub crt_static_allows_dylibs: bool,
/// Whether or not the CRT is statically linked by default.
pub crt_static_default: bool,
/// Whether or not crt-static is respected by the compiler (or is a no-op).
pub crt_static_respected: bool,
/// Whether or not stack probes (__rust_probestack) are enabled
pub stack_probes: bool,
/// The minimum alignment for global symbols.
pub min_global_align: Option<u64>,
/// Default number of codegen units to use in debug mode
pub default_codegen_units: Option<u64>,
/// Whether to generate trap instructions in places where optimization would
/// otherwise produce control flow that falls through into unrelated memory.
pub trap_unreachable: bool,
/// This target requires everything to be compiled with LTO to emit a final
/// executable, aka there is no native linker for this target.
pub requires_lto: bool,
/// This target has no support for threads.
pub singlethread: bool,
/// Whether library functions call lowering/optimization is disabled in LLVM
/// for this target unconditionally.
pub no_builtins: bool,
/// Whether to lower 128-bit operations to compiler_builtins calls. Use if
/// your backend only supports 64-bit and smaller math.
pub i128_lowering: bool,
/// The codegen backend to use for this target, typically "llvm"
pub codegen_backend: String,
/// The default visibility for symbols in this target should be "hidden"
/// rather than "default"
pub default_hidden_visibility: bool,
/// Whether or not bitcode is embedded in object files
pub embed_bitcode: bool,
/// Whether a .debug_gdb_scripts section will be added to the output object file
pub emit_debug_gdb_scripts: bool,
/// Whether or not to unconditionally `uwtable` attributes on functions,
/// typically because the platform needs to unwind for things like stack
/// unwinders.
pub requires_uwtable: bool,
/// Whether or not SIMD types are passed by reference in the Rust ABI,
/// typically required if a target can be compiled with a mixed set of
/// target features. This is `true` by default, and `false` for targets like
/// wasm32 where the whole program either has simd or not.
pub simd_types_indirect: bool,
/// Pass a list of symbol which should be exported in the dylib to the linker.
pub limit_rdylib_exports: bool,
/// If set, have the linker export exactly these symbols, instead of using
/// the usual logic to figure this out from the crate itself.
pub override_export_symbols: Option<Vec<String>>,
/// Determines how or whether the MergeFunctions LLVM pass should run for
/// this target. Either "disabled", "trampolines", or "aliases".
/// The MergeFunctions pass is generally useful, but some targets may need
/// to opt out. The default is "aliases".
///
/// Workaround for: https://github.com/rust-lang/rust/issues/57356
pub merge_functions: MergeFunctions,
/// Use platform dependent mcount function
pub target_mcount: String
}
impl Default for TargetOptions {
/// Creates a set of "sane defaults" for any target. This is still
/// incomplete, and if used for compilation, will certainly not work.
fn default() -> TargetOptions {
TargetOptions {
is_builtin: false,
linker: option_env!("CFG_DEFAULT_LINKER").map(|s| s.to_string()),
lld_flavor: LldFlavor::Ld,
pre_link_args: LinkArgs::new(),
pre_link_args_crt: LinkArgs::new(),
post_link_args: LinkArgs::new(),
asm_args: Vec::new(),
cpu: "generic".to_string(),
features: String::new(),
dynamic_linking: false,
only_cdylib: false,
executables: false,
relocation_model: "pic".to_string(),
code_model: None,
tls_model: "global-dynamic".to_string(),
disable_redzone: false,
eliminate_frame_pointer: true,
function_sections: true,
dll_prefix: "lib".to_string(),
dll_suffix: ".so".to_string(),
exe_suffix: String::new(),
staticlib_prefix: "lib".to_string(),
staticlib_suffix: ".a".to_string(),
target_family: None,
abi_return_struct_as_int: false,
is_like_osx: false,
is_like_solaris: false,
is_like_windows: false,
is_like_android: false,
is_like_emscripten: false,
is_like_msvc: false,
is_like_fuchsia: false,
linker_is_gnu: false,
allows_weak_linkage: true,
has_rpath: false,
no_default_libraries: true,
position_independent_executables: false,
needs_plt: false,
relro_level: RelroLevel::None,
pre_link_objects_exe: Vec::new(),
pre_link_objects_exe_crt: Vec::new(),
pre_link_objects_dll: Vec::new(),
post_link_objects: Vec::new(),
post_link_objects_crt: Vec::new(),
late_link_args: LinkArgs::new(),
link_env: Vec::new(),
archive_format: "gnu".to_string(),
custom_unwind_resume: false,
allow_asm: true,
has_elf_tls: false,
obj_is_bitcode: false,
no_integrated_as: false,
min_atomic_width: None,
max_atomic_width: None,
atomic_cas: true,
panic_strategy: PanicStrategy::Unwind,
abi_blacklist: vec![],
crt_static_allows_dylibs: false,
crt_static_default: false,
crt_static_respected: false,
stack_probes: false,
min_global_align: None,
default_codegen_units: None,
trap_unreachable: true,
requires_lto: false,
singlethread: false,
no_builtins: false,
i128_lowering: false,
codegen_backend: "llvm".to_string(),
default_hidden_visibility: false,
embed_bitcode: false,
emit_debug_gdb_scripts: true,
requires_uwtable: false,
simd_types_indirect: true,
limit_rdylib_exports: true,
override_export_symbols: None,
merge_functions: MergeFunctions::Aliases,
target_mcount: "mcount".to_string(),
}
}
}
impl Target {
/// Given a function ABI, turn it into the correct ABI for this target.
pub fn adjust_abi(&self, abi: Abi) -> Abi {
match abi {
Abi::System => {
if self.options.is_like_windows && self.arch == "x86" {
Abi::Stdcall
} else {
Abi::C
}
},
// These ABI kinds are ignored on non-x86 Windows targets.
// See https://docs.microsoft.com/en-us/cpp/cpp/argument-passing-and-naming-conventions
// and the individual pages for __stdcall et al.
Abi::Stdcall | Abi::Fastcall | Abi::Vectorcall | Abi::Thiscall => {
if self.options.is_like_windows && self.arch != "x86" {
Abi::C
} else {
abi
}
},
abi => abi
}
}
/// Minimum integer size in bits that this target can perform atomic
/// operations on.
pub fn min_atomic_width(&self) -> u64 {
self.options.min_atomic_width.unwrap_or(8)
}
/// Maximum integer size in bits that this target can perform atomic
/// operations on.
pub fn max_atomic_width(&self) -> u64 {
self.options.max_atomic_width.unwrap_or_else(|| self.target_pointer_width.parse().unwrap())
}
pub fn is_abi_supported(&self, abi: Abi) -> bool {
abi.generic() || !self.options.abi_blacklist.contains(&abi)
}
/// Loads a target descriptor from a JSON object.
pub fn from_json(obj: Json) -> TargetResult {
// While ugly, this code must remain this way to retain
// compatibility with existing JSON fields and the internal
// expected naming of the Target and TargetOptions structs.
// To ensure compatibility is retained, the built-in targets
// are round-tripped through this code to catch cases where
// the JSON parser is not updated to match the structs.
let get_req_field = |name: &str| {
obj.find(name)
.map(|s| s.as_string())
.and_then(|os| os.map(|s| s.to_string()))
.ok_or_else(|| format!("Field {} in target specification is required", name))
};
let get_opt_field = |name: &str, default: &str| {
obj.find(name).and_then(|s| s.as_string())
.map(|s| s.to_string())
.unwrap_or_else(|| default.to_string())
};
let mut base = Target {
llvm_target: get_req_field("llvm-target")?,
target_endian: get_req_field("target-endian")?,
target_pointer_width: get_req_field("target-pointer-width")?,
target_c_int_width: get_req_field("target-c-int-width")?,
data_layout: get_req_field("data-layout")?,
arch: get_req_field("arch")?,
target_os: get_req_field("os")?,
target_env: get_opt_field("env", ""),
target_vendor: get_opt_field("vendor", "unknown"),
linker_flavor: LinkerFlavor::from_str(&*get_req_field("linker-flavor")?)
.ok_or_else(|| {
format!("linker flavor must be {}", LinkerFlavor::one_of())
})?,
options: Default::default(),
};
macro_rules! key {
($key_name:ident) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).map(|o| o.as_string()
.map(|s| base.options.$key_name = s.to_string()));
} );
($key_name:ident, bool) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..])
.map(|o| o.as_boolean()
.map(|s| base.options.$key_name = s));
} );
($key_name:ident, Option<u64>) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..])
.map(|o| o.as_u64()
.map(|s| base.options.$key_name = Some(s)));
} );
($key_name:ident, MergeFunctions) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s.parse::<MergeFunctions>() {
Ok(mergefunc) => base.options.$key_name = mergefunc,
_ => return Some(Err(format!("'{}' is not a valid value for \
merge-functions. Use 'disabled', \
'trampolines', or 'aliases'.",
s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, PanicStrategy) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s {
"unwind" => base.options.$key_name = PanicStrategy::Unwind,
"abort" => base.options.$key_name = PanicStrategy::Abort,
_ => return Some(Err(format!("'{}' is not a valid value for \
panic-strategy. Use 'unwind' or 'abort'.",
s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, RelroLevel) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).and_then(|o| o.as_string().and_then(|s| {
match s.parse::<RelroLevel>() {
Ok(level) => base.options.$key_name = level,
_ => return Some(Err(format!("'{}' is not a valid value for \
relro-level. Use 'full', 'partial, or 'off'.",
s))),
}
Some(Ok(()))
})).unwrap_or(Ok(()))
} );
($key_name:ident, list) => ( {
let name = (stringify!($key_name)).replace("_", "-");
obj.find(&name[..]).map(|o| o.as_array()
.map(|v| base.options.$key_name = v.iter()
.map(|a| a.as_string().unwrap().to_string()).collect()