GCC backend subtree update

compiler/rustc_codegen_gcc/build_system/build_sysroot/Cargo.toml

@@ -6,6 +6,7 @@ resolver = "2"
 
 [dependencies]
 core = { path = "./sysroot_src/library/core" }
+compiler_builtins = { path = "./sysroot_src/library/compiler-builtins/compiler-builtins" }
 alloc = { path = "./sysroot_src/library/alloc" }
 std = { path = "./sysroot_src/library/std", features = ["panic_unwind", "backtrace"] }
 test = { path = "./sysroot_src/library/test" }

compiler/rustc_codegen_gcc/build_system/src/test.rs

@@ -9,8 +9,8 @@ use crate::build;
 use crate::config::{Channel, ConfigInfo};
 use crate::utils::{
     create_dir, get_sysroot_dir, get_toolchain, git_clone, git_clone_root_dir, remove_file,
-    run_command, run_command_with_env, run_command_with_output, run_command_with_output_and_env,
-    rustc_version_info, split_args, walk_dir,
+    run_command, run_command_with_env, run_command_with_output_and_env, rustc_version_info,
+    split_args, walk_dir,
 };
 
 type Env = HashMap<String, String>;
@@ -485,30 +485,6 @@ fn setup_rustc(env: &mut Env, args: &TestArg) -> Result<PathBuf, String> {
         run_command_with_output_and_env(&[&"git", &"checkout"], rust_dir, Some(env))?;
     }
 
-    let mut patches = Vec::new();
-    walk_dir(
-        "patches/tests",
-        &mut |_| Ok(()),
-        &mut |file_path: &Path| {
-            patches.push(file_path.to_path_buf());
-            Ok(())
-        },
-        false,
-    )?;
-    patches.sort();
-    // TODO: remove duplication with prepare.rs by creating a apply_patch function in the utils
-    // module.
-    for file_path in patches {
-        println!("[GIT] apply `{}`", file_path.display());
-        let path = Path::new("../..").join(file_path);
-        run_command_with_output(&[&"git", &"apply", &path], rust_dir)?;
-        run_command_with_output(&[&"git", &"add", &"-A"], rust_dir)?;
-        run_command_with_output(
-            &[&"git", &"commit", &"--no-gpg-sign", &"-m", &format!("Patch {}", path.display())],
-            rust_dir,
-        )?;
-    }
-
     let cargo = String::from_utf8(
         run_command_with_env(&[&"rustup", &"which", &"cargo"], rust_dir, Some(env))?.stdout,
     )

compiler/rustc_codegen_gcc/rust-toolchain

@@ -1,3 +1,3 @@
 [toolchain]
-channel = "nightly-2025-06-02"
+channel = "nightly-2025-06-28"
 components = ["rust-src", "rustc-dev", "llvm-tools-preview"]

compiler/rustc_codegen_gcc/src/abi.rs

@@ -1,7 +1,9 @@
 #[cfg(feature = "master")]
 use gccjit::FnAttribute;
 use gccjit::{ToLValue, ToRValue, Type};
-use rustc_abi::{ArmCall, CanonAbi, InterruptKind, Reg, RegKind, X86Call};
+#[cfg(feature = "master")]
+use rustc_abi::{ArmCall, CanonAbi, InterruptKind, X86Call};
+use rustc_abi::{Reg, RegKind};
 use rustc_codegen_ssa::traits::{AbiBuilderMethods, BaseTypeCodegenMethods};
 use rustc_data_structures::fx::FxHashSet;
 use rustc_middle::bug;

compiler/rustc_codegen_gcc/src/builder.rs

@@ -538,11 +538,6 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
     }
 
     fn ret(&mut self, mut value: RValue<'gcc>) {
-        if self.structs_as_pointer.borrow().contains(&value) {
-            // NOTE: hack to workaround a limitation of the rustc API: see comment on
-            // CodegenCx.structs_as_pointer
-            value = value.dereference(self.location).to_rvalue();
-        }
         let expected_return_type = self.current_func().get_return_type();
         if !expected_return_type.is_compatible_with(value.get_type()) {
             // NOTE: due to opaque pointers now being used, we need to cast here.
@@ -700,7 +695,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         let a = self.gcc_int_cast(a, a_type);
         let b_type = b.get_type().to_unsigned(self);
         let b = self.gcc_int_cast(b, b_type);
-        a / b
+        self.gcc_udiv(a, b)
     }
 
     fn sdiv(&mut self, a: RValue<'gcc>, b: RValue<'gcc>) -> RValue<'gcc> {
@@ -712,8 +707,8 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         // FIXME(antoyo): rustc_codegen_ssa::mir::intrinsic uses different types for a and b but they
         // should be the same.
         let typ = a.get_type().to_signed(self);
-        let b = self.context.new_cast(self.location, b, typ);
-        a / b
+        let b = self.gcc_int_cast(b, typ);
+        self.gcc_sdiv(a, b)
     }
 
     fn fdiv(&mut self, a: RValue<'gcc>, b: RValue<'gcc>) -> RValue<'gcc> {
@@ -1119,13 +1114,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         // TODO(antoyo)
     }
 
-    fn store(&mut self, mut val: RValue<'gcc>, ptr: RValue<'gcc>, align: Align) -> RValue<'gcc> {
-        if self.structs_as_pointer.borrow().contains(&val) {
-            // NOTE: hack to workaround a limitation of the rustc API: see comment on
-            // CodegenCx.structs_as_pointer
-            val = val.dereference(self.location).to_rvalue();
-        }
-
+    fn store(&mut self, val: RValue<'gcc>, ptr: RValue<'gcc>, align: Align) -> RValue<'gcc> {
         self.store_with_flags(val, ptr, align, MemFlags::empty())
     }
 
@@ -1508,16 +1497,6 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
             element.get_address(self.location)
         } else if value_type.dyncast_vector().is_some() {
             panic!();
-        } else if let Some(pointer_type) = value_type.get_pointee() {
-            if let Some(struct_type) = pointer_type.is_struct() {
-                // NOTE: hack to workaround a limitation of the rustc API: see comment on
-                // CodegenCx.structs_as_pointer
-                aggregate_value
-                    .dereference_field(self.location, struct_type.get_field(idx as i32))
-                    .to_rvalue()
-            } else {
-                panic!("Unexpected type {:?}", value_type);
-            }
         } else if let Some(struct_type) = value_type.is_struct() {
             aggregate_value
                 .access_field(self.location, struct_type.get_field(idx as i32))
@@ -1537,21 +1516,18 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
         assert_eq!(idx as usize as u64, idx);
         let value_type = aggregate_value.get_type();
 
+        let new_val = self.current_func().new_local(None, value_type, "aggregate_value");
+        self.block.add_assignment(None, new_val, aggregate_value);
+
         let lvalue = if value_type.dyncast_array().is_some() {
             let index = self
                 .context
                 .new_rvalue_from_long(self.u64_type, i64::try_from(idx).expect("i64::try_from"));
-            self.context.new_array_access(self.location, aggregate_value, index)
+            self.context.new_array_access(self.location, new_val, index)
         } else if value_type.dyncast_vector().is_some() {
             panic!();
-        } else if let Some(pointer_type) = value_type.get_pointee() {
-            if let Some(struct_type) = pointer_type.is_struct() {
-                // NOTE: hack to workaround a limitation of the rustc API: see comment on
-                // CodegenCx.structs_as_pointer
-                aggregate_value.dereference_field(self.location, struct_type.get_field(idx as i32))
-            } else {
-                panic!("Unexpected type {:?}", value_type);
-            }
+        } else if let Some(struct_type) = value_type.is_struct() {
+            new_val.access_field(None, struct_type.get_field(idx as i32))
         } else {
             panic!("Unexpected type {:?}", value_type);
         };
@@ -1568,7 +1544,7 @@ impl<'a, 'gcc, 'tcx> BuilderMethods<'a, 'tcx> for Builder<'a, 'gcc, 'tcx> {
 
         self.llbb().add_assignment(self.location, lvalue, value);
 
-        aggregate_value
+        new_val.to_rvalue()
     }
 
     fn set_personality_fn(&mut self, _personality: Function<'gcc>) {

compiler/rustc_codegen_gcc/src/common.rs

@@ -117,15 +117,7 @@ impl<'gcc, 'tcx> ConstCodegenMethods for CodegenCx<'gcc, 'tcx> {
 
     fn const_undef(&self, typ: Type<'gcc>) -> RValue<'gcc> {
         let local = self.current_func.borrow().expect("func").new_local(None, typ, "undefined");
-        if typ.is_struct().is_some() {
-            // NOTE: hack to workaround a limitation of the rustc API: see comment on
-            // CodegenCx.structs_as_pointer
-            let pointer = local.get_address(None);
-            self.structs_as_pointer.borrow_mut().insert(pointer);
-            pointer
-        } else {
-            local.to_rvalue()
-        }
+        local.to_rvalue()
     }
 
     fn const_poison(&self, typ: Type<'gcc>) -> RValue<'gcc> {

compiler/rustc_codegen_gcc/src/context.rs

@@ -124,14 +124,6 @@ pub struct CodegenCx<'gcc, 'tcx> {
 
     pub pointee_infos: RefCell<FxHashMap<(Ty<'tcx>, Size), Option<PointeeInfo>>>,
 
-    /// NOTE: a hack is used because the rustc API is not suitable to libgccjit and as such,
-    /// `const_undef()` returns struct as pointer so that they can later be assigned a value (in
-    /// e.g. Builder::insert_value).
-    /// As such, this set remembers which of these pointers were returned by this function so that
-    /// they can be dereferenced later.
-    /// FIXME(antoyo): fix the rustc API to avoid having this hack.
-    pub structs_as_pointer: RefCell<FxHashSet<RValue<'gcc>>>,
-
     #[cfg(feature = "master")]
     pub cleanup_blocks: RefCell<FxHashSet<Block<'gcc>>>,
     /// The alignment of a u128/i128 type.
@@ -304,7 +296,6 @@ impl<'gcc, 'tcx> CodegenCx<'gcc, 'tcx> {
             #[cfg(feature = "master")]
             rust_try_fn: Cell::new(None),
             pointee_infos: Default::default(),
-            structs_as_pointer: Default::default(),
             #[cfg(feature = "master")]
             cleanup_blocks: Default::default(),
         };