Limit target endian to an enum instead of free string

compiler/rustc_codegen_llvm/src/va_arg.rs

@@ -9,7 +9,7 @@ use rustc_codegen_ssa::{
 };
 use rustc_middle::ty::layout::HasTyCtxt;
 use rustc_middle::ty::Ty;
-use rustc_target::abi::{Align, HasDataLayout, LayoutOf, Size};
+use rustc_target::abi::{Align, Endian, HasDataLayout, LayoutOf, Size};
 
 fn round_pointer_up_to_alignment(
  bx: &mut Builder<'a, 'll, 'tcx>,
@@ -52,7 +52,7 @@ fn emit_direct_ptr_va_arg(
  let next = bx.inbounds_gep(addr, &[full_direct_size]);
  bx.store(next, va_list_addr, bx.tcx().data_layout.pointer_align.abi);
 
- if size.bytes() < slot_size.bytes() && &*bx.tcx().sess.target.endian == "big" {
+ if size.bytes() < slot_size.bytes() && bx.tcx().sess.target.endian == Endian::Big {
  let adjusted_size = bx.cx().const_i32((slot_size.bytes() - size.bytes()) as i32);
  let adjusted = bx.inbounds_gep(addr, &[adjusted_size]);
  (bx.bitcast(adjusted, bx.cx().type_ptr_to(llty)), addr_align)
@@ -105,7 +105,7 @@ fn emit_aapcs_va_arg(
  let mut end = bx.build_sibling_block("va_arg.end");
  let zero = bx.const_i32(0);
  let offset_align = Align::from_bytes(4).unwrap();
- assert!(&*bx.tcx().sess.target.endian == "little");
+ assert_eq!(bx.tcx().sess.target.endian, Endian::Little);
 
  let gr_type = target_ty.is_any_ptr() || target_ty.is_integral();
  let (reg_off, reg_top_index, slot_size) = if gr_type {

compiler/rustc_session/src/config.rs

@@ -819,7 +819,7 @@ pub fn default_configuration(sess: &Session) -> CrateConfig {
  }
  }
  ret.insert((sym::target_arch, Some(Symbol::intern(arch))));
- ret.insert((sym::target_endian, Some(Symbol::intern(end))));
+ ret.insert((sym::target_endian, Some(Symbol::intern(end.as_str()))));
  ret.insert((sym::target_pointer_width, Some(Symbol::intern(&wordsz))));
  ret.insert((sym::target_env, Some(Symbol::intern(env))));
  ret.insert((sym::target_vendor, Some(Symbol::intern(vendor))));

compiler/rustc_target/src/abi/mod.rs

@@ -4,11 +4,14 @@ pub use Primitive::*;
 use crate::spec::Target;
 
 use std::convert::{TryFrom, TryInto};
+use std::fmt;
 use std::num::NonZeroUsize;
 use std::ops::{Add, AddAssign, Deref, Mul, Range, RangeInclusive, Sub};
+use std::str::FromStr;
 
 use rustc_index::vec::{Idx, IndexVec};
 use rustc_macros::HashStable_Generic;
+use rustc_serialize::json::{Json, ToJson};
 use rustc_span::Span;
 
 pub mod call;
@@ -152,22 +155,19 @@ impl TargetDataLayout {
  }
 
  // Perform consistency checks against the Target information.
- let endian_str = match dl.endian {
- Endian::Little => "little",
- Endian::Big => "big",
- };
- if endian_str != target.endian {
+ if dl.endian != target.endian {
  return Err(format!(
  "inconsistent target specification: \"data-layout\" claims \
- architecture is {}-endian, while \"target-endian\" is `{}`",
- endian_str, target.endian
+ architecture is {}-endian, while \"target-endian\" is `{}`",
+ dl.endian.as_str(),
+ target.endian.as_str(),
  ));
  }
 
  if dl.pointer_size.bits() != target.pointer_width.into() {
  return Err(format!(
  "inconsistent target specification: \"data-layout\" claims \
-  pointers are {}-bit, while \"target-pointer-width\" is `{}`",
+ pointers are {}-bit, while \"target-pointer-width\" is `{}`",
  dl.pointer_size.bits(),
  target.pointer_width
  ));
@@ -234,6 +234,39 @@ pub enum Endian {
  Big,
 }
 
+impl Endian {
+ pub fn as_str(&self) -> &'static str {
+ match self {
+ Self::Little => "little",
+ Self::Big => "big",
+ }
+ }
+}
+
+impl fmt::Debug for Endian {
+ fn fmt(&self, f: &mut fmt::Formatter<'_>) -> fmt::Result {
+ f.write_str(self.as_str())
+ }
+}
+
+impl FromStr for Endian {
+ type Err = String;
+
+ fn from_str(s: &str) -> Result<Self, Self::Err> {
+ match s {
+ "little" => Ok(Self::Little),
+ "big" => Ok(Self::Big),
+ _ => Err(format!(r#"unknown endian: "{}""#, s)),
+ }
+ }
+}
+
+impl ToJson for Endian {
+ fn to_json(&self) -> Json {
+ self.as_str().to_json()
+ }
+}
+
 /// Size of a type in bytes.
 #[derive(Copy, Clone, PartialEq, Eq, PartialOrd, Ord, Hash, Debug, Encodable, Decodable)]
 #[derive(HashStable_Generic)]

compiler/rustc_target/src/spec/armebv7r_none_eabi.rs

@@ -1,5 +1,6 @@
 // Targets the Big endian Cortex-R4/R5 processor (ARMv7-R)
 
+use crate::abi::Endian;
 use crate::spec::{LinkerFlavor, LldFlavor, PanicStrategy, RelocModel};
 use crate::spec::{Target, TargetOptions};
 
@@ -11,7 +12,7 @@ pub fn target() -> Target {
  arch: "arm".to_string(),
 
  options: TargetOptions {
- endian: "big".to_string(),
+ endian: Endian::Big,
  linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
  executables: true,
  linker: Some("rust-lld".to_owned()),

compiler/rustc_target/src/spec/armebv7r_none_eabihf.rs

@@ -1,5 +1,6 @@
 // Targets the Cortex-R4F/R5F processor (ARMv7-R)
 
+use crate::abi::Endian;
 use crate::spec::{LinkerFlavor, LldFlavor, PanicStrategy, RelocModel};
 use crate::spec::{Target, TargetOptions};
 
@@ -11,7 +12,7 @@ pub fn target() -> Target {
  arch: "arm".to_string(),
 
  options: TargetOptions {
- endian: "big".to_string(),
+ endian: Endian::Big,
  linker_flavor: LinkerFlavor::Lld(LldFlavor::Ld),
  executables: true,
  linker: Some("rust-lld".to_owned()),

compiler/rustc_target/src/spec/mips64_unknown_linux_gnuabi64.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -7,7 +8,7 @@ pub fn target() -> Target {
  data_layout: "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
  arch: "mips64".to_string(),
  options: TargetOptions {
- endian: "big".to_string(),
+ endian: Endian::Big,
  // NOTE(mips64r2) matches C toolchain
  cpu: "mips64r2".to_string(),
  features: "+mips64r2".to_string(),

compiler/rustc_target/src/spec/mips64_unknown_linux_muslabi64.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -11,6 +12,6 @@ pub fn target() -> Target {
  pointer_width: 64,
  data_layout: "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
  arch: "mips64".to_string(),
- options: TargetOptions { endian: "big".to_string(), mcount: "_mcount".to_string(), ..base },
+ options: TargetOptions { endian: Endian::Big, mcount: "_mcount".to_string(), ..base },
  }
 }

compiler/rustc_target/src/spec/mips_unknown_linux_gnu.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -7,7 +8,7 @@ pub fn target() -> Target {
  data_layout: "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64".to_string(),
  arch: "mips".to_string(),
  options: TargetOptions {
- endian: "big".to_string(),
+ endian: Endian::Big,
  cpu: "mips32r2".to_string(),
  features: "+mips32r2,+fpxx,+nooddspreg".to_string(),
  max_atomic_width: Some(32),

compiler/rustc_target/src/spec/mips_unknown_linux_musl.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -11,6 +12,6 @@ pub fn target() -> Target {
  pointer_width: 32,
  data_layout: "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64".to_string(),
  arch: "mips".to_string(),
- options: TargetOptions { endian: "big".to_string(), mcount: "_mcount".to_string(), ..base },
+ options: TargetOptions { endian: Endian::Big, mcount: "_mcount".to_string(), ..base },
  }
 }

compiler/rustc_target/src/spec/mips_unknown_linux_uclibc.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -7,7 +8,7 @@ pub fn target() -> Target {
  data_layout: "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64".to_string(),
  arch: "mips".to_string(),
  options: TargetOptions {
- endian: "big".to_string(),
+ endian: Endian::Big,
  cpu: "mips32r2".to_string(),
  features: "+mips32r2,+soft-float".to_string(),
  max_atomic_width: Some(32),

compiler/rustc_target/src/spec/mipsisa32r6_unknown_linux_gnu.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -7,7 +8,7 @@ pub fn target() -> Target {
  data_layout: "E-m:m-p:32:32-i8:8:32-i16:16:32-i64:64-n32-S64".to_string(),
  arch: "mips".to_string(),
  options: TargetOptions {
- endian: "big".to_string(),
+ endian: Endian::Big,
  cpu: "mips32r6".to_string(),
  features: "+mips32r6".to_string(),
  max_atomic_width: Some(32),

compiler/rustc_target/src/spec/mipsisa64r6_unknown_linux_gnuabi64.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -7,7 +8,7 @@ pub fn target() -> Target {
  data_layout: "E-m:e-i8:8:32-i16:16:32-i64:64-n32:64-S128".to_string(),
  arch: "mips64".to_string(),
  options: TargetOptions {
- endian: "big".to_string(),
+ endian: Endian::Big,
  // NOTE(mips64r6) matches C toolchain
  cpu: "mips64r6".to_string(),
  features: "+mips64r6".to_string(),

compiler/rustc_target/src/spec/mod.rs

@@ -34,6 +34,7 @@
 //! the target's settings, though `target-feature` and `link-args` will *add*
 //! to the list specified by the target, rather than replace.
 
+use crate::abi::Endian;
 use crate::spec::abi::{lookup as lookup_abi, Abi};
 use crate::spec::crt_objects::{CrtObjects, CrtObjectsFallback};
 use rustc_serialize::json::{Json, ToJson};
@@ -705,8 +706,8 @@ pub struct TargetOptions {
  /// Whether the target is built-in or loaded from a custom target specification.
  pub is_builtin: bool,
 
- /// String to use as the `target_endian` `cfg` variable. Defaults to "little".
- pub endian: String,
+ /// Used as the `target_endian` `cfg` variable. Defaults to little endian.
+ pub endian: Endian,
  /// Width of c_int type. Defaults to "32".
  pub c_int_width: String,
  /// OS name to use for conditional compilation (`target_os`). Defaults to "none".
@@ -1010,7 +1011,7 @@ impl Default for TargetOptions {
  fn default() -> TargetOptions {
  TargetOptions {
  is_builtin: false,
- endian: "little".to_string(),
+ endian: Endian::Little,
  c_int_width: "32".to_string(),
  os: "none".to_string(),
  env: String::new(),
@@ -1439,8 +1440,10 @@ impl Target {
  } );
  }
 
+ if let Some(s) = obj.find("target-endian").and_then(Json::as_string) {
+ base.endian = s.parse()?;
+ }
  key!(is_builtin, bool);
- key!(endian = "target-endian");
  key!(c_int_width = "target-c-int-width");
  key!(os);
  key!(env);

compiler/rustc_target/src/spec/powerpc64_unknown_freebsd.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -11,6 +12,6 @@ pub fn target() -> Target {
  pointer_width: 64,
  data_layout: "E-m:e-i64:64-n32:64".to_string(),
  arch: "powerpc64".to_string(),
- options: TargetOptions { endian: "big".to_string(), mcount: "_mcount".to_string(), ..base },
+ options: TargetOptions { endian: Endian::Big, mcount: "_mcount".to_string(), ..base },
  }
 }

compiler/rustc_target/src/spec/powerpc64_unknown_linux_gnu.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{LinkerFlavor, RelroLevel, Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -15,6 +16,6 @@ pub fn target() -> Target {
  pointer_width: 64,
  data_layout: "E-m:e-i64:64-n32:64".to_string(),
  arch: "powerpc64".to_string(),
- options: TargetOptions { endian: "big".to_string(), mcount: "_mcount".to_string(), ..base },
+ options: TargetOptions { endian: Endian::Big, mcount: "_mcount".to_string(), ..base },
  }
 }

compiler/rustc_target/src/spec/powerpc64_unknown_linux_musl.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -11,6 +12,6 @@ pub fn target() -> Target {
  pointer_width: 64,
  data_layout: "E-m:e-i64:64-n32:64".to_string(),
  arch: "powerpc64".to_string(),
- options: TargetOptions { endian: "big".to_string(), mcount: "_mcount".to_string(), ..base },
+ options: TargetOptions { endian: Endian::Big, mcount: "_mcount".to_string(), ..base },
  }
 }

compiler/rustc_target/src/spec/powerpc64_wrs_vxworks.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -11,6 +12,6 @@ pub fn target() -> Target {
  pointer_width: 64,
  data_layout: "E-m:e-i64:64-n32:64".to_string(),
  arch: "powerpc64".to_string(),
- options: TargetOptions { endian: "big".to_string(), ..base },
+ options: TargetOptions { endian: Endian::Big, ..base },
  }
 }

compiler/rustc_target/src/spec/powerpc_unknown_linux_gnu.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -10,6 +11,6 @@ pub fn target() -> Target {
  pointer_width: 32,
  data_layout: "E-m:e-p:32:32-i64:64-n32".to_string(),
  arch: "powerpc".to_string(),
- options: TargetOptions { endian: "big".to_string(), mcount: "_mcount".to_string(), ..base },
+ options: TargetOptions { endian: Endian::Big, mcount: "_mcount".to_string(), ..base },
  }
 }

compiler/rustc_target/src/spec/powerpc_unknown_linux_gnuspe.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -10,6 +11,6 @@ pub fn target() -> Target {
  pointer_width: 32,
  data_layout: "E-m:e-p:32:32-i64:64-n32".to_string(),
  arch: "powerpc".to_string(),
- options: TargetOptions { endian: "big".to_string(), mcount: "_mcount".to_string(), ..base },
+ options: TargetOptions { endian: Endian::Big, mcount: "_mcount".to_string(), ..base },
  }
 }

compiler/rustc_target/src/spec/powerpc_unknown_linux_musl.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -10,6 +11,6 @@ pub fn target() -> Target {
  pointer_width: 32,
  data_layout: "E-m:e-p:32:32-i64:64-n32".to_string(),
  arch: "powerpc".to_string(),
- options: TargetOptions { endian: "big".to_string(), mcount: "_mcount".to_string(), ..base },
+ options: TargetOptions { endian: Endian::Big, mcount: "_mcount".to_string(), ..base },
  }
 }

compiler/rustc_target/src/spec/powerpc_unknown_netbsd.rs

@@ -1,3 +1,4 @@
+use crate::abi::Endian;
 use crate::spec::{LinkerFlavor, Target, TargetOptions};
 
 pub fn target() -> Target {
@@ -10,10 +11,6 @@ pub fn target() -> Target {
  pointer_width: 32,
  data_layout: "E-m:e-p:32:32-i64:64-n32".to_string(),
  arch: "powerpc".to_string(),
- options: TargetOptions {
- endian: "big".to_string(),
- mcount: "__mcount".to_string(),
- ..base
- },
+ options: TargetOptions { endian: Endian::Big, mcount: "__mcount".to_string(), ..base },
  }
 }