gccrs: Refactor hir to avoid raw pointers and unneeded fwd

Refactor the hir tree files to remove raw pointer usage and most forward
declarations. Move implementation out of headers and split headers into
smaller and more manageable units.

gcc/rust/ChangeLog:

	* Make-lang.in: Add new files.
	* hir/tree/rust-hir-item.h: Move Item definition and remove
	implementations to their corresponding cc file.
	* hir/tree/rust-hir-expr.h: Move implementation to the corresponding
	cc file.
	* hir/tree/rust-hir-path.h: Likewise.
	* hir/tree/rust-hir-pattern.h: Likewise.
	* hir/tree/rust-hir-stmt.h: Likewise.
	* hir/tree/rust-hir-type.h: Likewise.
	* hir/tree/rust-hir-visitor.h: Likewise.
	* hir/tree/rust-hir.h: Likewise.
	* hir/tree/rust-hir.cc (Crate::Crate): Add implementations from Crate
	and remove ConstGenericParam implementations to move them to their
	own file.
	* hir/tree/rust-hir-attrs.h: New file.
	* hir/tree/rust-hir-bound-abstract.h: New file.
	* hir/tree/rust-hir-bound.h: New file.
	* hir/tree/rust-hir-expr-abstract.h: New file.
	* hir/tree/rust-hir-expr.cc: New file.
	* hir/tree/rust-hir-generic-param.cc: New file.
	* hir/tree/rust-hir-generic-param.h: New file.
	* hir/tree/rust-hir-item.cc: New file.
	* hir/tree/rust-hir-literal.h: New file.
	* hir/tree/rust-hir-node.h: New file.
	* hir/tree/rust-hir-path.cc: New file.
	* hir/tree/rust-hir-pattern-abstract.h: New file.
	* hir/tree/rust-hir-simple-path.h: New file.
	* hir/tree/rust-hir-stmt.cc: New file.
	* hir/tree/rust-hir-trait-bound.h: New file.
	* hir/tree/rust-hir-type-abstract.cc: New file.
	* hir/tree/rust-hir-type-abstract.h: New file.
	* hir/tree/rust-hir-type-no-bounds.h: New file.
	* hir/tree/rust-hir-type.cc: New file.
	* hir/tree/rust-hir-visibility.h: New file.
	* hir/tree/rust-hir-visitable.h: New file.
	* checks/lints/rust-lint-marklive.h: Use References.
	* hir/rust-ast-lower-expr.cc (ASTLoweringExpr::visit): Reformat
	vectors.
	* hir/rust-hir-dump.cc (Dump::visit): Use reference.
	* typecheck/rust-hir-type-check-struct.cc (TypeCheckStructExpr::resolve):
	Use references.
	* typecheck/rust-tyty-bounds.cc: Likewise.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.patry@embecosm.com>

1 files changed, 64 insertions, 0 deletions

diff --git a/gcc/rust/hir/tree/rust-hir-simple-path.h b/gcc/rust/hir/tree/rust-hir-simple-path.h
new file mode 100644
index 0000000..7f832ff
--- /dev/null
+++ b/gcc/rust/hir/tree/rust-hir-simple-path.h
@@ -0,0 +1,64 @@
+// 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_SIMPLE_PATH_H
+#define RUST_HIR_SIMPLE_PATH_H
+
+#include "rust-hir-map.h"
+
+namespace Rust {
+namespace HIR {
+
+class SimplePathSegment
+{
+  Analysis::NodeMapping mappings;
+
+public:
+  SimplePathSegment (Analysis::NodeMapping mappings) : mappings (mappings) {}
+
+  const Analysis::NodeMapping &get_mappings () const { return mappings; }
+};
+
+class SimplePath
+{
+  std::vector<SimplePathSegment> segments;
+  Analysis::NodeMapping mappings;
+  location_t locus;
+
+public:
+  SimplePath (std::vector<SimplePathSegment> segments,
+	      Analysis::NodeMapping mappings, location_t locus)
+    : segments (std::move (segments)), mappings (mappings), locus (locus)
+  {}
+
+  static HIR::SimplePath create_empty ()
+  {
+    return HIR::SimplePath ({}, Analysis::NodeMapping::get_error (),
+			    UNDEF_LOCATION);
+  }
+
+  bool is_error () const { return segments.empty (); }
+
+  const Analysis::NodeMapping &get_mappings () const { return mappings; }
+  location_t get_locus () const { return locus; }
+};
+
+} // namespace HIR
+} // namespace Rust
+
+#endif