Auto merge of #65622 - Centril:rollup-l8orba7, r=Centril

Rollup of 6 pull requests

Successful merges:

 - #64996 (Inline `ptr::null(_mut)` even in debug builds)
 - #65551 (Avoid realloc in `CString::new`)
 - #65593 (add test for calling non-const fn)
 - #65595 (move `parse_cfgspecs` to `rustc_interface`)
 - #65600 (Remove unneeded `ref` from docs)
 - #65602 (Fix plural mistake in emitter.rs)

Failed merges:

r? @ghost

Author: bors

Cargo.lock

@@ -3556,6 +3556,7 @@ dependencies = [
  "rustc_plugin_impl",
  "rustc_privacy",
  "rustc_resolve",
+ "rustc_target",
  "rustc_traits",
  "rustc_typeck",
  "serialize",

src/libcore/option.rs

@@ -64,7 +64,7 @@
 //!
 //! fn check_optional(optional: Option<Box<i32>>) {
 //!     match optional {
-//!         Some(ref p) => println!("has value {}", p),
+//!         Some(p) => println!("has value {}", p),
 //!         None => println!("has no value"),
 //!     }
 //! }
@@ -83,7 +83,7 @@
 //! let msg = Some("howdy");
 //!
 //! // Take a reference to the contained string
-//! if let Some(ref m) = msg {
+//! if let Some(m) = &msg {
 //!     println!("{}", *m);
 //! }
 //!

src/libcore/ptr/mod.rs

@@ -188,7 +188,7 @@ unsafe fn real_drop_in_place<T: ?Sized>(to_drop: &mut T) {
 /// let p: *const i32 = ptr::null();
 /// assert!(p.is_null());
 /// ```
-#[inline]
+#[inline(always)]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_promotable]
 pub const fn null<T>() -> *const T { 0 as *const T }
@@ -203,7 +203,7 @@ pub const fn null<T>() -> *const T { 0 as *const T }
 /// let p: *mut i32 = ptr::null_mut();
 /// assert!(p.is_null());
 /// ```
-#[inline]
+#[inline(always)]
 #[stable(feature = "rust1", since = "1.0.0")]
 #[rustc_promotable]
 pub const fn null_mut<T>() -> *mut T { 0 as *mut T }

src/librustc/session/config.rs

@@ -7,24 +7,19 @@ use crate::session::{early_error, early_warn, Session};
 use crate::session::search_paths::SearchPath;
 
 use rustc_data_structures::fx::FxHashSet;
-use rustc_data_structures::sync::Lrc;
 
 use rustc_target::spec::{LinkerFlavor, MergeFunctions, PanicStrategy, RelroLevel};
 use rustc_target::spec::{Target, TargetTriple};
 
 use syntax;
-use syntax::ast::{self, IntTy, UintTy, MetaItemKind};
+use syntax::ast::{self, IntTy, UintTy};
 use syntax::source_map::{FileName, FilePathMapping};
 use syntax::edition::{Edition, EDITION_NAME_LIST, DEFAULT_EDITION};
-use syntax::parse::new_parser_from_source_str;
-use syntax::parse::token;
-use syntax::sess::ParseSess;
 use syntax::symbol::{sym, Symbol};
 use syntax::feature_gate::UnstableFeatures;
-use syntax::source_map::SourceMap;
 
 use errors::emitter::HumanReadableErrorType;
-use errors::{ColorConfig, FatalError, Handler, SourceMapperDyn};
+use errors::{ColorConfig, FatalError, Handler};
 
 use getopts;
 
@@ -1854,59 +1849,6 @@ pub fn rustc_optgroups() -> Vec<RustcOptGroup> {
     opts
 }
 
-struct NullEmitter;
-
-impl errors::emitter::Emitter for NullEmitter {
-    fn emit_diagnostic(&mut self, _: &errors::Diagnostic) {}
-    fn source_map(&self) -> Option<&Lrc<SourceMapperDyn>> { None }
-}
-
-// Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
-pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
-    syntax::with_default_globals(move || {
-        let cfg = cfgspecs.into_iter().map(|s| {
-
-            let cm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
-            let handler = Handler::with_emitter(false, None, Box::new(NullEmitter));
-            let sess = ParseSess::with_span_handler(handler, cm);
-            let filename = FileName::cfg_spec_source_code(&s);
-            let mut parser = new_parser_from_source_str(&sess, filename, s.to_string());
-
-            macro_rules! error {($reason: expr) => {
-                early_error(ErrorOutputType::default(),
-                            &format!(concat!("invalid `--cfg` argument: `{}` (", $reason, ")"), s));
-            }}
-
-            match &mut parser.parse_meta_item() {
-                Ok(meta_item) if parser.token == token::Eof => {
-                    if meta_item.path.segments.len() != 1 {
-                        error!("argument key must be an identifier");
-                    }
-                    match &meta_item.kind {
-                        MetaItemKind::List(..) => {
-                            error!(r#"expected `key` or `key="value"`"#);
-                        }
-                        MetaItemKind::NameValue(lit) if !lit.kind.is_str() => {
-                            error!("argument value must be a string");
-                        }
-                        MetaItemKind::NameValue(..) | MetaItemKind::Word => {
-                            let ident = meta_item.ident().expect("multi-segment cfg key");
-                            return (ident.name, meta_item.value_str());
-                        }
-                    }
-                }
-                Ok(..) => {}
-                Err(err) => err.cancel(),
-            }
-
-            error!(r#"expected `key` or `key="value"`"#);
-        }).collect::<ast::CrateConfig>();
-        cfg.into_iter().map(|(a, b)| {
-            (a.to_string(), b.map(|b| b.to_string()))
-        }).collect()
-    })
-}
-
 pub fn get_cmd_lint_options(matches: &getopts::Matches,
                             error_format: ErrorOutputType)
                             -> (Vec<(String, lint::Level)>, bool, Option<lint::Level>) {
@@ -2877,6 +2819,3 @@ mod dep_tracking {
         }
     }
 }
-
-#[cfg(test)]
-mod tests;

src/librustc_codegen_llvm/back/lto.rs

@@ -53,9 +53,7 @@ fn prepare_lto(cgcx: &CodegenContext<LlvmCodegenBackend>,
 
     let symbol_filter = &|&(ref name, level): &(String, SymbolExportLevel)| {
         if level.is_below_threshold(export_threshold) {
-            let mut bytes = Vec::with_capacity(name.len() + 1);
-            bytes.extend(name.bytes());
-            Some(CString::new(bytes).unwrap())
+            Some(CString::new(name.as_str()).unwrap())
         } else {
             None
         }

src/librustc_driver/lib.rs

@@ -167,7 +167,7 @@ pub fn run_compiler(
     };
 
     let sopts = config::build_session_options(&matches);
-    let cfg = config::parse_cfgspecs(matches.opt_strs("cfg"));
+    let cfg = interface::parse_cfgspecs(matches.opt_strs("cfg"));
 
     let mut dummy_config = |sopts, cfg, diagnostic_output| {
         let mut config = interface::Config {

src/librustc_errors/emitter.rs

@@ -12,7 +12,7 @@ use Destination::*;
 use syntax_pos::{SourceFile, Span, MultiSpan};
 
 use crate::{
-    Level, CodeSuggestion, Diagnostic, SubDiagnostic,
+    Level, CodeSuggestion, Diagnostic, SubDiagnostic, pluralise,
     SuggestionStyle, SourceMapper, SourceMapperDyn, DiagnosticId,
 };
 use crate::Level::Error;
@@ -1572,7 +1572,8 @@ impl EmitterWriter {
             }
         }
         if suggestions.len() > MAX_SUGGESTIONS {
-            let msg = format!("and {} other candidates", suggestions.len() - MAX_SUGGESTIONS);
+            let others = suggestions.len() - MAX_SUGGESTIONS;
+            let msg = format!("and {} other candidate{}", others, pluralise!(others));
             buffer.puts(row_num, max_line_num_len + 3, &msg, Style::NoStyle);
         } else if notice_capitalization {
             let msg = "notice the capitalization difference";

src/librustc_interface/Cargo.toml

@@ -27,6 +27,7 @@ rustc_codegen_utils = { path = "../librustc_codegen_utils" }
 rustc_metadata = { path = "../librustc_metadata" }
 rustc_mir = { path = "../librustc_mir" }
 rustc_passes = { path = "../librustc_passes" }
+rustc_target = { path = "../librustc_target" }
 rustc_typeck = { path = "../librustc_typeck" }
 rustc_lint = { path = "../librustc_lint" }
 rustc_errors = { path = "../librustc_errors" }

src/librustc_interface/interface.rs

@@ -3,7 +3,8 @@ use crate::util;
 pub use crate::passes::BoxedResolver;
 
 use rustc::lint;
-use rustc::session::config::{self, Input};
+use rustc::session::early_error;
+use rustc::session::config::{self, Input, ErrorOutputType};
 use rustc::session::{DiagnosticOutput, Session};
 use rustc::util::common::ErrorReported;
 use rustc_codegen_utils::codegen_backend::CodegenBackend;
@@ -14,9 +15,13 @@ use rustc_metadata::cstore::CStore;
 use std::path::PathBuf;
 use std::result;
 use std::sync::{Arc, Mutex};
-use syntax;
-use syntax::source_map::{FileLoader, SourceMap};
+use syntax::{self, parse};
+use syntax::ast::{self, MetaItemKind};
+use syntax::parse::token;
+use syntax::source_map::{FileName, FilePathMapping, FileLoader, SourceMap};
+use syntax::sess::ParseSess;
 use syntax_pos::edition;
+use rustc_errors::{Diagnostic, emitter::Emitter, Handler, SourceMapperDyn};
 
 pub type Result<T> = result::Result<T, ErrorReported>;
 
@@ -60,6 +65,58 @@ impl Compiler {
     }
 }
 
+/// Converts strings provided as `--cfg [cfgspec]` into a `crate_cfg`.
+pub fn parse_cfgspecs(cfgspecs: Vec<String>) -> FxHashSet<(String, Option<String>)> {
+    struct NullEmitter;
+    impl Emitter for NullEmitter {
+        fn emit_diagnostic(&mut self, _: &Diagnostic) {}
+        fn source_map(&self) -> Option<&Lrc<SourceMapperDyn>> { None }
+    }
+
+    syntax::with_default_globals(move || {
+        let cfg = cfgspecs.into_iter().map(|s| {
+
+            let cm = Lrc::new(SourceMap::new(FilePathMapping::empty()));
+            let handler = Handler::with_emitter(false, None, Box::new(NullEmitter));
+            let sess = ParseSess::with_span_handler(handler, cm);
+            let filename = FileName::cfg_spec_source_code(&s);
+            let mut parser = parse::new_parser_from_source_str(&sess, filename, s.to_string());
+
+            macro_rules! error {($reason: expr) => {
+                early_error(ErrorOutputType::default(),
+                            &format!(concat!("invalid `--cfg` argument: `{}` (", $reason, ")"), s));
+            }}
+
+            match &mut parser.parse_meta_item() {
+                Ok(meta_item) if parser.token == token::Eof => {
+                    if meta_item.path.segments.len() != 1 {
+                        error!("argument key must be an identifier");
+                    }
+                    match &meta_item.kind {
+                        MetaItemKind::List(..) => {
+                            error!(r#"expected `key` or `key="value"`"#);
+                        }
+                        MetaItemKind::NameValue(lit) if !lit.kind.is_str() => {
+                            error!("argument value must be a string");
+                        }
+                        MetaItemKind::NameValue(..) | MetaItemKind::Word => {
+                            let ident = meta_item.ident().expect("multi-segment cfg key");
+                            return (ident.name, meta_item.value_str());
+                        }
+                    }
+                }
+                Ok(..) => {}
+                Err(err) => err.cancel(),
+            }
+
+            error!(r#"expected `key` or `key="value"`"#);
+        }).collect::<ast::CrateConfig>();
+        cfg.into_iter().map(|(a, b)| {
+            (a.to_string(), b.map(|b| b.to_string()))
+        }).collect()
+    })
+}
+
 /// The compiler configuration
 pub struct Config {
     /// Command line options

src/librustc_interface/lib.rs

@@ -18,3 +18,6 @@ pub mod util;
 mod proc_macro_decls;
 
 pub use interface::{run_compiler, Config};
+
+#[cfg(test)]
+mod tests;