Rollup of 6 pull requests

Cargo.lock

@@ -1660,7 +1660,7 @@ checksum = "3ca8957e71f04a205cb162508f9326aea04676c8dfd0711220190d6b83664f3f"
 dependencies = [
  "bitmaps",
  "rand_core 0.5.1",
- "rand_xoshiro",
+ "rand_xoshiro 0.4.0",
  "sized-chunks",
  "typenum",
  "version_check",
@@ -2256,7 +2256,7 @@ dependencies = [
  "libc",
  "log",
  "measureme",
- "rand 0.8.3",
+ "rand 0.8.4",
  "rustc-workspace-hack",
  "rustc_version",
  "shell-escape",
@@ -2852,9 +2852,9 @@ dependencies = [
 
 [[package]]
 name = "rand"
-version = "0.8.3"
+version = "0.8.4"
 source = "registry+https://github.com/rust-lang/crates.io-index"
-checksum = "0ef9e7e66b4468674bfcb0c81af8b7fa0bb154fa9f28eb840da5c447baeb8d7e"
+checksum = "2e7573632e6454cf6b99d7aac4ccca54be06da05aca2ef7423d22d27d4d4bcd8"
 dependencies = [
  "libc",
  "rand_chacha 0.3.0",
@@ -2945,6 +2945,15 @@ dependencies = [
  "rand_core 0.5.1",
 ]
 
+[[package]]
+name = "rand_xoshiro"
+version = "0.6.0"
+source = "registry+https://github.com/rust-lang/crates.io-index"
+checksum = "6f97cdb2a36ed4183de61b2f824cc45c9f1037f28afe0a322e9fff4c108b5aaa"
+dependencies = [
+ "rand_core 0.6.2",
+]
+
 [[package]]
 name = "rayon"
 version = "1.3.1"
@@ -4087,6 +4096,8 @@ dependencies = [
  "either",
  "gsgdt",
  "polonius-engine",
+ "rand 0.8.4",
+ "rand_xoshiro 0.6.0",
  "rustc-rayon-core",
  "rustc_apfloat",
  "rustc_arena",
@@ -5097,7 +5108,7 @@ checksum = "dac1c663cfc93810f88aed9b8941d48cabf856a1b111c29a40439018d870eb22"
 dependencies = [
  "cfg-if 1.0.0",
  "libc",
- "rand 0.8.3",
+ "rand 0.8.4",
  "redox_syscall",
  "remove_dir_all",
  "winapi",

compiler/rustc_builtin_macros/src/format.rs

@@ -1154,11 +1154,12 @@ pub fn expand_preparsed_format_args(
                     // account for `"` and account for raw strings `r#`
                     let padding = str_style.map(|i| i + 2).unwrap_or(1);
                     for sub in foreign::$kind::iter_subs(fmt_str, padding) {
-                        let trn = match sub.translate() {
-                            Some(trn) => trn,
+                        let (trn, success) = match sub.translate() {
+                            Ok(trn) => (trn, true),
+                            Err(Some(msg)) => (msg, false),
 
                             // If it has no translation, don't call it out specifically.
-                            None => continue,
+                            _ => continue,
                         };
 
                         let pos = sub.position();
@@ -1175,9 +1176,24 @@ pub fn expand_preparsed_format_args(
 
                         if let Some(inner_sp) = pos {
                             let sp = fmt_sp.from_inner(inner_sp);
-                            suggestions.push((sp, trn));
+
+                            if success {
+                                suggestions.push((sp, trn));
+                            } else {
+                                diag.span_note(
+                                    sp,
+                                    &format!("format specifiers use curly braces, and {}", trn),
+                                );
+                            }
                         } else {
-                            diag.help(&format!("`{}` should be written as `{}`", sub, trn));
+                            if success {
+                                diag.help(&format!("`{}` should be written as `{}`", sub, trn));
+                            } else {
+                                diag.note(&format!(
+                                    "`{}` should use curly braces, and {}",
+                                    sub, trn
+                                ));
+                            }
                         }
                     }
 

compiler/rustc_builtin_macros/src/format_foreign.rs

@@ -1,4 +1,4 @@
-pub mod printf {
+pub(crate) mod printf {
     use super::strcursor::StrCursor as Cur;
     use rustc_span::InnerSpan;
 
@@ -36,10 +36,10 @@ pub mod printf {
         ///
         /// This ignores cases where the substitution does not have an exact equivalent, or where
         /// the substitution would be unnecessary.
-        pub fn translate(&self) -> Option<String> {
+        pub fn translate(&self) -> Result<String, Option<String>> {
             match *self {
                 Substitution::Format(ref fmt) => fmt.translate(),
-                Substitution::Escape => None,
+                Substitution::Escape => Err(None),
             }
         }
     }
@@ -68,9 +68,9 @@ pub mod printf {
     impl Format<'_> {
         /// Translate this directive into an equivalent Rust formatting directive.
         ///
-        /// Returns `None` in cases where the `printf` directive does not have an exact Rust
+        /// Returns `Err` in cases where the `printf` directive does not have an exact Rust
         /// equivalent, rather than guessing.
-        pub fn translate(&self) -> Option<String> {
+        pub fn translate(&self) -> Result<String, Option<String>> {
             use std::fmt::Write;
 
             let (c_alt, c_zero, c_left, c_plus) = {
@@ -84,7 +84,12 @@ pub mod printf {
                         '0' => c_zero = true,
                         '-' => c_left = true,
                         '+' => c_plus = true,
-                        _ => return None,
+                        _ => {
+                            return Err(Some(format!(
+                                "the flag `{}` is unknown or unsupported",
+                                c
+                            )));
+                        }
                     }
                 }
                 (c_alt, c_zero, c_left, c_plus)
@@ -104,7 +109,9 @@ pub mod printf {
             let width = match self.width {
                 Some(Num::Next) => {
                     // NOTE: Rust doesn't support this.
-                    return None;
+                    return Err(Some(
+                        "you have to use a positional or named parameter for the width".to_string(),
+                    ));
                 }
                 w @ Some(Num::Arg(_)) => w,
                 w @ Some(Num::Num(_)) => w,
@@ -125,13 +132,21 @@ pub mod printf {
                 "p" => (Some(self.type_), false, true),
                 "g" => (Some("e"), true, false),
                 "G" => (Some("E"), true, false),
-                _ => return None,
+                _ => {
+                    return Err(Some(format!(
+                        "the conversion specifier `{}` is unknown or unsupported",
+                        self.type_
+                    )));
+                }
             };
 
             let (fill, width, precision) = match (is_int, width, precision) {
                 (true, Some(_), Some(_)) => {
                     // Rust can't duplicate this insanity.
-                    return None;
+                    return Err(Some(
+                        "width and precision cannot both be specified for integer conversions"
+                            .to_string(),
+                    ));
                 }
                 (true, None, Some(p)) => (Some("0"), Some(p), None),
                 (true, w, None) => (fill, w, None),
@@ -169,7 +184,17 @@ pub mod printf {
             s.push('{');
 
             if let Some(arg) = self.parameter {
-                write!(s, "{}", arg.checked_sub(1)?).ok()?;
+                match write!(
+                    s,
+                    "{}",
+                    match arg.checked_sub(1) {
+                        Some(a) => a,
+                        None => return Err(None),
+                    }
+                ) {
+                    Err(_) => return Err(None),
+                    _ => {}
+                }
             }
 
             if has_options {
@@ -199,12 +224,18 @@ pub mod printf {
                 }
 
                 if let Some(width) = width {
-                    width.translate(&mut s).ok()?;
+                    match width.translate(&mut s) {
+                        Err(_) => return Err(None),
+                        _ => {}
+                    }
                 }
 
                 if let Some(precision) = precision {
                     s.push('.');
-                    precision.translate(&mut s).ok()?;
+                    match precision.translate(&mut s) {
+                        Err(_) => return Err(None),
+                        _ => {}
+                    }
                 }
 
                 if let Some(type_) = type_ {
@@ -213,7 +244,7 @@ pub mod printf {
             }
 
             s.push('}');
-            Some(s)
+            Ok(s)
         }
     }
 
@@ -623,11 +654,11 @@ pub mod shell {
             }
         }
 
-        pub fn translate(&self) -> Option<String> {
+        pub fn translate(&self) -> Result<String, Option<String>> {
             match *self {
-                Substitution::Ordinal(n, _) => Some(format!("{{{}}}", n)),
-                Substitution::Name(n, _) => Some(format!("{{{}}}", n)),
-                Substitution::Escape(_) => None,
+                Substitution::Ordinal(n, _) => Ok(format!("{{{}}}", n)),
+                Substitution::Name(n, _) => Ok(format!("{{{}}}", n)),
+                Substitution::Escape(_) => Err(None),
             }
         }
     }

compiler/rustc_builtin_macros/src/format_foreign/printf/tests.rs

@@ -3,7 +3,7 @@ use super::{iter_subs, parse_next_substitution as pns, Format as F, Num as N, Su
 macro_rules! assert_eq_pnsat {
     ($lhs:expr, $rhs:expr) => {
         assert_eq!(
-            pns($lhs).and_then(|(s, _)| s.translate()),
+            pns($lhs).and_then(|(s, _)| s.translate().ok()),
             $rhs.map(<String as From<&str>>::from)
         )
     };
@@ -98,7 +98,7 @@ fn test_parse() {
 #[test]
 fn test_iter() {
     let s = "The %d'th word %% is: `%.*s` %!\n";
-    let subs: Vec<_> = iter_subs(s, 0).map(|sub| sub.translate()).collect();
+    let subs: Vec<_> = iter_subs(s, 0).map(|sub| sub.translate().ok()).collect();
     assert_eq!(
         subs.iter().map(|ms| ms.as_ref().map(|s| &s[..])).collect::<Vec<_>>(),
         vec![Some("{}"), None, Some("{:.*}"), None]

compiler/rustc_builtin_macros/src/format_foreign/shell/tests.rs

@@ -3,7 +3,7 @@ use super::{parse_next_substitution as pns, Substitution as S};
 macro_rules! assert_eq_pnsat {
     ($lhs:expr, $rhs:expr) => {
         assert_eq!(
-            pns($lhs).and_then(|(f, _)| f.translate()),
+            pns($lhs).and_then(|(f, _)| f.translate().ok()),
             $rhs.map(<String as From<&str>>::from)
         )
     };
@@ -37,7 +37,7 @@ fn test_parse() {
 fn test_iter() {
     use super::iter_subs;
     let s = "The $0'th word $$ is: `$WORD` $!\n";
-    let subs: Vec<_> = iter_subs(s, 0).map(|sub| sub.translate()).collect();
+    let subs: Vec<_> = iter_subs(s, 0).map(|sub| sub.translate().ok()).collect();
     assert_eq!(
         subs.iter().map(|ms| ms.as_ref().map(|s| &s[..])).collect::<Vec<_>>(),
         vec![Some("{0}"), None, Some("{WORD}")]

compiler/rustc_codegen_llvm/src/back/write.rs

@@ -129,7 +129,8 @@ fn to_pass_builder_opt_level(cfg: config::OptLevel) -> llvm::PassBuilderOptLevel
 fn to_llvm_relocation_model(relocation_model: RelocModel) -> llvm::RelocModel {
     match relocation_model {
         RelocModel::Static => llvm::RelocModel::Static,
-        RelocModel::Pic => llvm::RelocModel::PIC,
+        // LLVM doesn't have a PIE relocation model, it represents PIE as PIC with an extra attribute.
+        RelocModel::Pic | RelocModel::Pie => llvm::RelocModel::PIC,
         RelocModel::DynamicNoPic => llvm::RelocModel::DynamicNoPic,
         RelocModel::Ropi => llvm::RelocModel::ROPI,
         RelocModel::Rwpi => llvm::RelocModel::RWPI,

compiler/rustc_codegen_llvm/src/context.rs

@@ -195,11 +195,14 @@ pub unsafe fn create_module(
     let llvm_target = SmallCStr::new(&sess.target.llvm_target);
     llvm::LLVMRustSetNormalizedTarget(llmod, llvm_target.as_ptr());
 
-    if sess.relocation_model() == RelocModel::Pic {
+    let reloc_model = sess.relocation_model();
+    if matches!(reloc_model, RelocModel::Pic | RelocModel::Pie) {
         llvm::LLVMRustSetModulePICLevel(llmod);
         // PIE is potentially more effective than PIC, but can only be used in executables.
         // If all our outputs are executables, then we can relax PIC to PIE.
-        if sess.crate_types().iter().all(|ty| *ty == CrateType::Executable) {
+        if reloc_model == RelocModel::Pie
+            || sess.crate_types().iter().all(|ty| *ty == CrateType::Executable)
+        {
             llvm::LLVMRustSetModulePIELevel(llmod);
         }
     }

compiler/rustc_codegen_llvm/src/lib.rs

@@ -211,9 +211,16 @@ impl CodegenBackend for LlvmCodegenBackend {
         match req {
             PrintRequest::RelocationModels => {
                 println!("Available relocation models:");
-                for name in
-                    &["static", "pic", "dynamic-no-pic", "ropi", "rwpi", "ropi-rwpi", "default"]
-                {
+                for name in &[
+                    "static",
+                    "pic",
+                    "pie",
+                    "dynamic-no-pic",
+                    "ropi",
+                    "rwpi",
+                    "ropi-rwpi",
+                    "default",
+                ] {
                     println!("    {}", name);
                 }
                 println!();

compiler/rustc_codegen_llvm/src/mono_item.rs

@@ -143,6 +143,12 @@ impl CodegenCx<'ll, 'tcx> {
             return true;
         }
 
+        // With pie relocation model calls of functions defined in the translation
+        // unit can use copy relocations.
+        if self.tcx.sess.relocation_model() == RelocModel::Pie && !is_declaration {
+            return true;
+        }
+
         return false;
     }
 }

compiler/rustc_codegen_ssa/src/back/link.rs

@@ -1490,9 +1490,13 @@ fn exec_linker(
 fn link_output_kind(sess: &Session, crate_type: CrateType) -> LinkOutputKind {
     let kind = match (crate_type, sess.crt_static(Some(crate_type)), sess.relocation_model()) {
         (CrateType::Executable, _, _) if sess.is_wasi_reactor() => LinkOutputKind::WasiReactorExe,
-        (CrateType::Executable, false, RelocModel::Pic) => LinkOutputKind::DynamicPicExe,
+        (CrateType::Executable, false, RelocModel::Pic | RelocModel::Pie) => {
+            LinkOutputKind::DynamicPicExe
+        }
         (CrateType::Executable, false, _) => LinkOutputKind::DynamicNoPicExe,
-        (CrateType::Executable, true, RelocModel::Pic) => LinkOutputKind::StaticPicExe,
+        (CrateType::Executable, true, RelocModel::Pic | RelocModel::Pie) => {
+            LinkOutputKind::StaticPicExe
+        }
         (CrateType::Executable, true, _) => LinkOutputKind::StaticNoPicExe,
         (_, true, _) => LinkOutputKind::StaticDylib,
         (_, false, _) => LinkOutputKind::DynamicDylib,

compiler/rustc_hir/src/hir.rs

@@ -384,6 +384,16 @@ impl GenericArgs<'_> {
         self.args.iter().any(|arg| matches!(arg, GenericArg::Type(_)))
     }
 
+    pub fn has_err(&self) -> bool {
+        self.args.iter().any(|arg| match arg {
+            GenericArg::Type(ty) => matches!(ty.kind, TyKind::Err),
+            _ => false,
+        }) || self.bindings.iter().any(|arg| match arg.kind {
+            TypeBindingKind::Equality { ty } => matches!(ty.kind, TyKind::Err),
+            _ => false,
+        })
+    }
+
     #[inline]
     pub fn num_type_params(&self) -> usize {
         self.args.iter().filter(|arg| matches!(arg, GenericArg::Type(_))).count()

compiler/rustc_middle/Cargo.toml

@@ -32,3 +32,5 @@ chalk-ir = "0.55.0"
 smallvec = { version = "1.6.1", features = ["union", "may_dangle"] }
 rustc_session = { path = "../rustc_session" }
 rustc_type_ir = { path = "../rustc_type_ir" }
+rand = "0.8.4"
+rand_xoshiro = "0.6.0"