Rollup merge of rust-lang#144592 - fee1-dead-contrib:target_spec, r=Noratrieb

generate list of all variants with `target_spec_enum`

This helps us avoid the hardcoded lists elsewhere.

r? `@Noratrieb`

Author: matthiaskrgr

compiler/rustc_codegen_llvm/src/lib.rs

@@ -45,6 +45,7 @@ use rustc_middle::util::Providers;
 use rustc_session::Session;
 use rustc_session::config::{OptLevel, OutputFilenames, PrintKind, PrintRequest};
 use rustc_span::Symbol;
+use rustc_target::spec::{RelocModel, TlsModel};
 
 mod abi;
 mod allocator;
@@ -244,16 +245,7 @@ impl CodegenBackend for LlvmCodegenBackend {
         match req.kind {
             PrintKind::RelocationModels => {
                 writeln!(out, "Available relocation models:").unwrap();
-                for name in &[
-                    "static",
-                    "pic",
-                    "pie",
-                    "dynamic-no-pic",
-                    "ropi",
-                    "rwpi",
-                    "ropi-rwpi",
-                    "default",
-                ] {
+                for name in RelocModel::ALL.iter().map(RelocModel::desc).chain(["default"]) {
                     writeln!(out, "    {name}").unwrap();
                 }
                 writeln!(out).unwrap();
@@ -267,9 +259,7 @@ impl CodegenBackend for LlvmCodegenBackend {
             }
             PrintKind::TlsModels => {
                 writeln!(out, "Available TLS models:").unwrap();
-                for name in
-                    &["global-dynamic", "local-dynamic", "initial-exec", "local-exec", "emulated"]
-                {
+                for name in TlsModel::ALL.iter().map(TlsModel::desc) {
                     writeln!(out, "    {name}").unwrap();
                 }
                 writeln!(out).unwrap();

compiler/rustc_session/src/config/cfg.rs

@@ -374,11 +374,13 @@ impl CheckCfg {
 
         ins!(sym::overflow_checks, no_values);
 
-        ins!(sym::panic, empty_values).extend(&PanicStrategy::all());
+        ins!(sym::panic, empty_values)
+            .extend(PanicStrategy::ALL.iter().map(PanicStrategy::desc_symbol));
 
         ins!(sym::proc_macro, no_values);
 
-        ins!(sym::relocation_model, empty_values).extend(RelocModel::all());
+        ins!(sym::relocation_model, empty_values)
+            .extend(RelocModel::ALL.iter().map(RelocModel::desc_symbol));
 
         let sanitize_values = SanitizerSet::all()
             .into_iter()

compiler/rustc_target/src/lib.rs

@@ -76,31 +76,31 @@ fn find_relative_libdir(sysroot: &Path) -> std::borrow::Cow<'static, str> {
 macro_rules! target_spec_enum {
     (
         $( #[$attr:meta] )*
-        pub enum $name:ident {
+        pub enum $Name:ident {
             $(
                 $( #[$variant_attr:meta] )*
-                $variant:ident = $string:literal,
+                $Variant:ident = $string:literal,
             )*
         }
         parse_error_type = $parse_error_type:literal;
     ) => {
         $( #[$attr] )*
         #[derive(Clone, Copy, PartialEq, Eq, Hash, Debug, PartialOrd, Ord)]
         #[derive(schemars::JsonSchema)]
-        pub enum $name {
+        pub enum $Name {
             $(
                 $( #[$variant_attr] )*
                 #[serde(rename = $string)] // for JSON schema generation only
-                $variant,
+                $Variant,
             )*
         }
 
-        impl FromStr for $name {
+        impl FromStr for $Name {
             type Err = String;
 
             fn from_str(s: &str) -> Result<Self, Self::Err> {
                 Ok(match s {
-                    $( $string => Self::$variant, )*
+                    $( $string => Self::$Variant, )*
                     _ => {
                         let all = [$( concat!("'", $string, "'") ),*].join(", ");
                         return Err(format!("invalid {}: '{s}'. allowed values: {all}", $parse_error_type));
@@ -109,24 +109,25 @@ macro_rules! target_spec_enum {
             }
         }
 
-        impl $name {
+        impl $Name {
+            pub const ALL: &'static [$Name] = &[ $( $Name::$Variant, )* ];
             pub fn desc(&self) -> &'static str {
                 match self {
-                    $( Self::$variant => $string, )*
+                    $( Self::$Variant => $string, )*
                 }
             }
         }
 
-        impl crate::json::ToJson for $name {
+        impl crate::json::ToJson for $Name {
             fn to_json(&self) -> crate::json::Json {
                 self.desc().to_json()
             }
         }
 
-        crate::json::serde_deserialize_from_str!($name);
+        crate::json::serde_deserialize_from_str!($Name);
 
 
-        impl std::fmt::Display for $name {
+        impl std::fmt::Display for $Name {
             fn fmt(&self, f: &mut std::fmt::Formatter<'_>) -> std::fmt::Result {
                 f.write_str(self.desc())
             }

compiler/rustc_target/src/spec/mod.rs

@@ -854,10 +854,6 @@ impl PanicStrategy {
             PanicStrategy::Abort => sym::abort,
         }
     }
-
-    pub const fn all() -> [Symbol; 2] {
-        [Self::Abort.desc_symbol(), Self::Unwind.desc_symbol()]
-    }
 }
 
 crate::target_spec_enum! {
@@ -974,18 +970,6 @@ impl RelocModel {
             RelocModel::RopiRwpi => sym::ropi_rwpi,
         }
     }
-
-    pub const fn all() -> [Symbol; 7] {
-        [
-            RelocModel::Static.desc_symbol(),
-            RelocModel::Pic.desc_symbol(),
-            RelocModel::Pie.desc_symbol(),
-            RelocModel::DynamicNoPic.desc_symbol(),
-            RelocModel::Ropi.desc_symbol(),
-            RelocModel::Rwpi.desc_symbol(),
-            RelocModel::RopiRwpi.desc_symbol(),
-        ]
-    }
 }
 
 crate::target_spec_enum! {