Merge pull request #468 from GuillaumeGomez/sync

Sync Rust 2024-03-10

build.rs

@@ -1,6 +0,0 @@
-// TODO: remove this file and deps/libLLVM-18-rust-1.78.0-nightly.so when
-// https://github.com/rust-lang/rust/pull/121967 is merged.
-fn main() {
-    println!("cargo:rerun-if-changed=deps/libLLVM-18-rust-1.78.0-nightly.so");
-    println!("cargo:rustc-link-search=deps");
-}

build_system/src/build.rs

@@ -107,6 +107,9 @@ pub fn build_sysroot(env: &HashMap<String, String>, config: &ConfigInfo) -> Resu
         rustflags.push_str(" -Cpanic=abort -Zpanic-abort-tests");
     }
     rustflags.push_str(" -Z force-unstable-if-unmarked");
+    if config.no_default_features {
+        rustflags.push_str(" -Csymbol-mangling-version=v0");
+    }
     let mut env = env.clone();
 
     let mut args: Vec<&dyn AsRef<OsStr>> = vec![&"cargo", &"build", &"--target", &config.target];

build_system/src/config.rs

@@ -128,6 +128,7 @@ pub struct ConfigInfo {
     // just to set the `gcc_path` field to display it.
     pub no_download: bool,
     pub no_default_features: bool,
+    pub backend: Option<String>,
 }
 
 impl ConfigInfo {
@@ -178,6 +179,14 @@ impl ConfigInfo {
                     return Err("Expected a value after `--cg_gcc-path`, found nothing".to_string())
                 }
             },
+            "--use-backend" => match args.next() {
+                Some(backend) if !backend.is_empty() => self.backend = Some(backend),
+                _ => {
+                    return Err(
+                        "Expected an argument after `--use-backend`, found nothing".into()
+                    )
+                }
+            },
             "--no-default-features" => self.no_default_features = true,
             _ => return Ok(false),
         }
@@ -377,39 +386,27 @@ impl ConfigInfo {
             "debug"
         };
 
-        let has_builtin_backend = env
-            .get("BUILTIN_BACKEND")
-            .map(|backend| !backend.is_empty())
-            .unwrap_or(false);
-
         let mut rustflags = Vec::new();
-        if has_builtin_backend {
-            // It means we're building inside the rustc testsuite, so some options need to be handled
-            // a bit differently.
-            self.cg_backend_path = "gcc".to_string();
-
-            match env.get("RUSTC_SYSROOT") {
-                Some(rustc_sysroot) if !rustc_sysroot.is_empty() => {
-                    rustflags.extend_from_slice(&["--sysroot".to_string(), rustc_sysroot.clone()]);
-                }
-                _ => {}
-            }
-            // This should not be needed, but is necessary for the CI in the rust repository.
-            // FIXME: Remove when the rust CI switches to the master version of libgccjit.
-            rustflags.push("-Cpanic=abort".to_string());
+        self.cg_backend_path = current_dir
+            .join("target")
+            .join(channel)
+            .join(&format!("librustc_codegen_gcc.{}", self.dylib_ext))
+            .display()
+            .to_string();
+        self.sysroot_path = current_dir
+            .join("build_sysroot/sysroot")
+            .display()
+            .to_string();
+        if let Some(backend) = &self.backend {
+            // This option is only used in the rust compiler testsuite. The sysroot is handled
+            // by its build system directly so no need to set it ourselves.
+            rustflags.push(format!("-Zcodegen-backend={}", backend));
         } else {
-            self.cg_backend_path = current_dir
-                .join("target")
-                .join(channel)
-                .join(&format!("librustc_codegen_gcc.{}", self.dylib_ext))
-                .display()
-                .to_string();
-            self.sysroot_path = current_dir
-                .join("build_sysroot/sysroot")
-                .display()
-                .to_string();
-            rustflags.extend_from_slice(&["--sysroot".to_string(), self.sysroot_path.clone()]);
-        };
+            rustflags.extend_from_slice(&[
+                "--sysroot".to_string(), self.sysroot_path.clone(),
+                format!("-Zcodegen-backend={}", self.cg_backend_path),
+            ]);
+        }
 
         // This environment variable is useful in case we want to change options of rustc commands.
         if let Some(cg_rustflags) = env.get("CG_RUSTFLAGS") {
@@ -427,10 +424,7 @@ impl ConfigInfo {
             rustflags.push("-Csymbol-mangling-version=v0".to_string());
         }
 
-        rustflags.extend_from_slice(&[
-            "-Cdebuginfo=2".to_string(),
-            format!("-Zcodegen-backend={}", self.cg_backend_path),
-        ]);
+        rustflags.push("-Cdebuginfo=2".to_string());
 
         // Since we don't support ThinLTO, disable LTO completely when not trying to do LTO.
         // TODO(antoyo): remove when we can handle ThinLTO.
@@ -454,9 +448,7 @@ impl ConfigInfo {
         ));
         let ld_library_path = format!(
             "{target}:{sysroot}:{gcc_path}",
-            // FIXME: It's possible to pick another out directory. Would be nice to have a command
-            // line option to change it.
-            target = current_dir.join("target/out").display(),
+            target = self.cargo_target_dir,
             sysroot = sysroot.display(),
             gcc_path = self.gcc_path,
         );
@@ -481,7 +473,7 @@ impl ConfigInfo {
         self.rustc_command.extend_from_slice(&rustflags);
         self.rustc_command.extend_from_slice(&[
             "-L".to_string(),
-            "crate=target/out".to_string(),
+            format!("crate={}", self.cargo_target_dir),
             "--out-dir".to_string(),
             self.cargo_target_dir.clone(),
         ]);
@@ -504,7 +496,8 @@ impl ConfigInfo {
     --config-file          : Location of the config file to be used
     --cg_gcc-path          : Location of the rustc_codegen_gcc root folder (used
                              when ran from another directory)
-    --no-default-features  : Add `--no-default-features` flag to cargo commands"
+    --no-default-features  : Add `--no-default-features` flag to cargo commands
+    --use-backend          : Useful only for rustc testsuite"
         );
     }
 }

build_system/src/test.rs

@@ -93,7 +93,6 @@ fn show_usage() {
     --features [arg]       : Add a new feature [arg]
     --use-system-gcc       : Use system installed libgccjit
     --build-only           : Only build rustc_codegen_gcc then exits
-    --use-backend          : Useful only for rustc testsuite
     --nb-parts             : Used to split rustc_tests (for CI needs)
     --current-part         : Used with `--nb-parts`, allows you to specify which parts to test"#
     );
@@ -113,7 +112,6 @@ struct TestArg {
     use_system_gcc: bool,
     runners: BTreeSet<String>,
     flags: Vec<String>,
-    backend: Option<String>,
     nb_parts: Option<usize>,
     current_part: Option<usize>,
     sysroot_panic_abort: bool,
@@ -145,14 +143,6 @@ impl TestArg {
                     test_arg.use_system_gcc = true;
                 }
                 "--build-only" => test_arg.build_only = true,
-                "--use-backend" => match args.next() {
-                    Some(backend) if !backend.is_empty() => test_arg.backend = Some(backend),
-                    _ => {
-                        return Err(
-                            "Expected an argument after `--use-backend`, found nothing".into()
-                        )
-                    }
-                },
                 "--nb-parts" => {
                     test_arg.nb_parts = Some(get_number_after_arg(&mut args, "--nb-parts")?);
                 }
@@ -199,7 +189,7 @@ impl TestArg {
 }
 
 fn build_if_no_backend(env: &Env, args: &TestArg) -> Result<(), String> {
-    if args.backend.is_some() {
+    if args.config_info.backend.is_some() {
         return Ok(());
     }
     let mut command: Vec<&dyn AsRef<OsStr>> = vec![&"cargo", &"rustc"];

deps/libLLVM-18-rust-1.78.0-nightly.so

@@ -1 +0,0 @@
-INPUT(libLLVM.so.18.1-rust-1.78.0-nightly)

example/mini_core.rs

@@ -472,6 +472,7 @@ pub trait Allocator {
 
 impl Allocator for () {}
 
+#[lang = "global_alloc_ty"]
 pub struct Global;
 
 impl Allocator for Global {}

rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2024-03-05"
+channel = "nightly-2024-03-10"
 components = ["rust-src", "rustc-dev", "llvm-tools-preview"]

src/asm.rs

@@ -114,7 +114,8 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         options: InlineAsmOptions,
         span: &[Span],
         instance: Instance<'_>,
-        _dest_catch_funclet: Option<(Self::BasicBlock, Self::BasicBlock, Option<&Self::Funclet>)>,
+        dest: Option<Self::BasicBlock>,
+        _dest_catch_funclet: Option<(Self::BasicBlock, Option<&Self::Funclet>)>,
     ) {
         if options.contains(InlineAsmOptions::MAY_UNWIND) {
             self.sess().dcx().create_err(UnwindingInlineAsm { span: span[0] }).emit();
@@ -132,6 +133,10 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         // added to `outputs.len()`
         let mut inputs = vec![];
 
+        // GCC index of a label equals its position in the array added to
+        // `outputs.len() + inputs.len()`.
+        let mut labels = vec![];
+
         // Clobbers collected from `out("explicit register") _` and `inout("expl_reg") var => _`
         let mut clobbers = vec![];
 
@@ -283,6 +288,10 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
                     constants_len +=
                         self.tcx.symbol_name(Instance::mono(self.tcx, def_id)).name.len();
                 }
+
+                InlineAsmOperandRef::Label { label } => {
+                    labels.push(label);
+                }
             }
         }
 
@@ -381,6 +390,10 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
                 InlineAsmOperandRef::Const { .. } => {
                     // processed in the previous pass
                 }
+
+                InlineAsmOperandRef::Label { .. } => {
+                    // processed in the previous pass
+                }
             }
         }
 
@@ -470,6 +483,13 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
                         InlineAsmOperandRef::Const { ref string } => {
                             template_str.push_str(string);
                         }
+
+                        InlineAsmOperandRef::Label { label } => {
+                            let label_gcc_index =
+                                labels.iter().position(|&l| l == label).expect("wrong rust index");
+                            let gcc_index = label_gcc_index + outputs.len() + inputs.len();
+                            push_to_template(Some('l'), gcc_index);
+                        }
                     }
                 }
             }
@@ -482,7 +502,12 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         // 4. Generate Extended Asm block
 
         let block = self.llbb();
-        let extended_asm = block.add_extended_asm(None, &template_str);
+        let extended_asm = if let Some(dest) = dest {
+            assert!(!labels.is_empty());
+            block.end_with_extended_asm_goto(None, &template_str, &labels, Some(dest))
+        } else {
+            block.add_extended_asm(None, &template_str)
+        };
 
         for op in &outputs {
             extended_asm.add_output_operand(None, &op.to_constraint(), op.tmp_var);
@@ -510,7 +535,7 @@ impl<'a, 'gcc, 'tcx> AsmBuilderMethods<'tcx> for Builder<'a, 'gcc, 'tcx> {
         if !options.contains(InlineAsmOptions::NOSTACK) {
             // TODO(@Commeownist): figure out how to align stack
         }
-        if options.contains(InlineAsmOptions::NORETURN) {
+        if dest.is_none() && options.contains(InlineAsmOptions::NORETURN) {
             let builtin_unreachable = self.context.get_builtin_function("__builtin_unreachable");
             let builtin_unreachable: RValue<'gcc> =
                 unsafe { std::mem::transmute(builtin_unreachable) };

tests/failing-ui-tests.txt

@@ -74,3 +74,5 @@ tests/ui/simd/repr_packed.rs
 tests/ui/async-await/in-trait/dont-project-to-specializable-projection.rs
 tests/ui/consts/try-operator.rs
 tests/ui/coroutine/unwind-abort-mix.rs
+tests/ui/type-alias-impl-trait/rpit_tait_equality_in_canonical_query.rs
+tests/ui/impl-trait/equality-in-canonical-query.rs