Fixes #2500

Add a seperate typecheck pass collect impl blocks, then report errors.

gcc/rust/ChangeLog:
	* typecheck/rust-hir-inherent-impl-check.h: new typecheck pass
	* typecheck/rust-hir-type-check.cc: modify the function which test primitive type
	* typecheck/rust-tyty.cc: the new typecheck pass entrypoint
gcc/testsuite/ChangeLog:
	* rust/compile/issue-2500-rustc.rs: testsuite case same with rustc
	* rust/compile/issue-2500.rs: testsuite case

Signed-off-by: Zhang He <[email protected]>

gcc/rust/typecheck/rust-hir-inherent-impl-check.h

@@ -0,0 +1,81 @@
+// Copyright (C) 2020-2024 Free Software Foundation, Inc.
+
+// This file is part of GCC.
+
+// GCC is free software; you can redistribute it and/or modify it under
+// the terms of the GNU General Public License as published by the Free
+// Software Foundation; either version 3, or (at your option) any later
+// version.
+
+// GCC is distributed in the hope that it will be useful, but WITHOUT ANY
+// WARRANTY; without even the implied warranty of MERCHANTABILITY or
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+// for more details.
+
+// You should have received a copy of the GNU General Public License
+// along with GCC; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+#ifndef RUST_HIR_INHERENT_IMPL_ITEM_CHECK_H
+#define RUST_HIR_INHERENT_IMPL_ITEM_CHECK_H
+
+#include "rust-hir-item.h"
+#include "rust-hir-type-check-base.h"
+#include "rust-type-util.h"
+#include <vector>
+
+namespace Rust {
+namespace Resolver {
+
+class PrimitiveImplCheck : public TypeCheckBase
+{
+public:
+  static void go ()
+  {
+    PrimitiveImplCheck pass;
+
+    pass.scan ();
+  }
+
+private:
+  void scan ()
+
+  {
+    std::vector<HIR::ImplBlock *> possible_primitive_impl;
+    mappings.iterate_impl_blocks ([&] (HirId id, HIR::ImplBlock *impl) -> bool {
+      // filtering  trait-impl-blocks
+      if (impl->has_trait_ref ())
+	return true;
+      HirId impl_ty_id = impl->get_type ().get_mappings ().get_hirid ();
+      TyTy::BaseType *impl_type = nullptr;
+      if (!query_type (impl_ty_id, &impl_type))
+	return true;
+      if (is_primitive_type_kind (impl_type->get_kind ()))
+	{
+	  possible_primitive_impl.push_back (impl);
+	}
+      return true;
+    });
+
+    for (auto impl : possible_primitive_impl)
+      {
+	report_error (impl);
+      }
+  }
+
+  void report_error (HIR::ImplBlock *impl)
+
+  {
+    rich_location r (line_table, impl->get_locus ());
+    std::string msg = "consider using an extension trait instead";
+    r.add_fixit_replace (impl->get_locus (), msg.c_str ());
+    r.add_range (impl->get_locus ());
+    std::string err = "impl";
+    err = "cannot define inherent `" + err + "` for primitive types";
+    rust_error_at (r, ErrorCode::E0390, "%s", err.c_str ());
+  }
+};
+
+} // namespace Resolver
+} // namespace Rust
+
+#endif // RUST_HIR_INHERENT_IMPL_ITEM_CHECK_H

gcc/rust/typecheck/rust-hir-type-check.cc

@@ -18,7 +18,9 @@
 
 #include "rust-hir-type-check.h"
 #include "rust-hir-full.h"
+#include "rust-hir-inherent-impl-check.h"
 #include "rust-hir-inherent-impl-overlap.h"
+#include "rust-hir-inherent-impl-check.h"
 #include "rust-hir-pattern.h"
 #include "rust-hir-type-check-expr.h"
 #include "rust-hir-type-check-item.h"
@@ -77,6 +79,10 @@ TypeResolution::Resolve (HIR::Crate &crate)
   if (saw_errors ())
     return;
 
+  PrimitiveImplCheck::go ();
+  if (saw_errors ())
+    return;
+
   OverlappingImplItemPass::go ();
   if (saw_errors ())
     return;

gcc/rust/typecheck/rust-tyty.cc

@@ -131,6 +131,12 @@ is_primitive_type_kind (TypeKind kind)
     case TypeKind::FLOAT:
     case TypeKind::NEVER:
     case TypeKind::STR:
+    case TypeKind::ARRAY:
+    case TypeKind::SLICE:
+    case TypeKind::POINTER:
+    case TypeKind::REF:
+    case TypeKind::FNPTR:
+    case TypeKind::TUPLE:
       return true;
     default:
       return false;

gcc/testsuite/rust/compile/issue-2500-rustc.rs

@@ -0,0 +1,25 @@
+impl u8 {
+    // { dg-error "cannot define inherent `impl` for primitive types" "" { target *-*-* } .-1 }
+    pub const B: u8 = 0;
+}
+
+impl str {
+    // { dg-error "cannot define inherent `impl` for primitive types" "" { target *-*-* } .-1 }
+    fn foo() {}
+}
+
+impl char {
+    // { dg-error "cannot define inherent `impl` for primitive types" "" { target *-*-* } .-1 }
+    pub const B: u8 = 0;
+    pub const C: u8 = 0;
+    fn foo() {}
+    fn bar(self) {}
+}
+
+struct MyType;
+impl &MyType {
+    // { dg-error "cannot define inherent `impl` for primitive types" "" { target *-*-* } .-1 }
+    pub fn for_ref(self) {}
+}
+
+fn main() {}

gcc/testsuite/rust/compile/issue-2500.rs

@@ -0,0 +1,9 @@
+#![allow(unused)]
+fn main() {
+struct Foo {
+    x: i32
+}
+
+impl *mut Foo {}
+// { dg-error "cannot define inherent `impl` for primitive types" "" { target *-*-* } .-1 }
+}