gccrs: Add HIR to GCC GENERIC lowering for all nodes

This patch implements the lowering mentioned in the previous patch for all HIR nodes.

	gcc/rust/
	* backend/rust-compile-block.cc: New.
	* backend/rust-compile-block.h: New.
	* backend/rust-compile-expr.cc: New.
	* backend/rust-compile-expr.h: New.
	* backend/rust-compile-extern.h: New.
	* backend/rust-compile-fnparam.cc: New.
	* backend/rust-compile-fnparam.h: New.
	* backend/rust-compile-implitem.cc: New.
	* backend/rust-compile-implitem.h: New.
	* backend/rust-compile-intrinsic.cc: New.
	* backend/rust-compile-intrinsic.h: New.
	* backend/rust-compile-item.cc: New.
	* backend/rust-compile-item.h: New.
	* backend/rust-compile-pattern.cc: New.
	* backend/rust-compile-pattern.h: New.
	* backend/rust-compile-resolve-path.cc: New.
	* backend/rust-compile-resolve-path.h: New.
	* backend/rust-compile-stmt.cc: New.
	* backend/rust-compile-stmt.h: New.
	* backend/rust-compile-struct-field-expr.cc: New.
	* backend/rust-compile-struct-field-expr.h: New.
	* backend/rust-compile-type.cc: New.
	* backend/rust-compile-type.h: New.
	* backend/rust-compile-var-decl.h: New.

Co-authored-by: David Faust <david.faust@oracle.com>

1 files changed, 121 insertions, 0 deletions

diff --git a/gcc/rust/backend/rust-compile-fnparam.cc b/gcc/rust/backend/rust-compile-fnparam.cc
new file mode 100644
index 0000000..3f0ec82
--- /dev/null
+++ b/gcc/rust/backend/rust-compile-fnparam.cc
@@ -0,0 +1,121 @@
+// Copyright (C) 2020-2022 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/>.
+
+#include "rust-compile-fnparam.h"
+#include "rust-compile-pattern.h"
+
+#include "gimple-expr.h"
+
+namespace Rust {
+namespace Compile {
+
+CompileFnParam::CompileFnParam (Context *ctx, tree fndecl, tree decl_type,
+				Location locus)
+  : HIRCompileBase (ctx), fndecl (fndecl), decl_type (decl_type), locus (locus),
+    compiled_param (ctx->get_backend ()->error_variable ())
+{}
+
+Bvariable *
+CompileFnParam::compile (Context *ctx, tree fndecl, HIR::FunctionParam *param,
+			 tree decl_type, Location locus)
+{
+  CompileFnParam compiler (ctx, fndecl, decl_type, locus);
+  param->get_param_name ()->accept_vis (compiler);
+  return compiler.compiled_param;
+}
+
+Bvariable *
+CompileFnParam::compile (Context *ctx, tree fndecl, HIR::Pattern *param,
+			 tree decl_type, Location locus)
+{
+  CompileFnParam compiler (ctx, fndecl, decl_type, locus);
+  param->accept_vis (compiler);
+  return compiler.compiled_param;
+}
+
+void
+CompileFnParam::visit (HIR::IdentifierPattern &pattern)
+{
+  if (!pattern.is_mut ())
+    decl_type = ctx->get_backend ()->immutable_type (decl_type);
+
+  compiled_param
+    = ctx->get_backend ()->parameter_variable (fndecl,
+					       pattern.get_identifier (),
+					       decl_type, locus);
+}
+
+void
+CompileFnParam::visit (HIR::WildcardPattern &pattern)
+{
+  decl_type = ctx->get_backend ()->immutable_type (decl_type);
+
+  compiled_param
+    = ctx->get_backend ()->parameter_variable (fndecl, "_", decl_type, locus);
+}
+
+void
+CompileFnParam::visit (HIR::StructPattern &pattern)
+{
+  // generate the anon param
+  tree tmp_ident = create_tmp_var_name ("RSTPRM");
+  std::string cpp_str_identifier = std::string (IDENTIFIER_POINTER (tmp_ident));
+
+  decl_type = ctx->get_backend ()->immutable_type (decl_type);
+  compiled_param
+    = ctx->get_backend ()->parameter_variable (fndecl, cpp_str_identifier,
+					       decl_type, locus);
+
+  // setup the pattern bindings
+  tree anon_param = ctx->get_backend ()->var_expression (compiled_param, locus);
+  CompilePatternBindings::Compile (&pattern, anon_param, ctx);
+}
+
+void
+CompileFnParam::visit (HIR::TupleStructPattern &pattern)
+{
+  // generate the anon param
+  tree tmp_ident = create_tmp_var_name ("RSTPRM");
+  std::string cpp_str_identifier = std::string (IDENTIFIER_POINTER (tmp_ident));
+
+  decl_type = ctx->get_backend ()->immutable_type (decl_type);
+  compiled_param
+    = ctx->get_backend ()->parameter_variable (fndecl, cpp_str_identifier,
+					       decl_type, locus);
+
+  // setup the pattern bindings
+  tree anon_param = ctx->get_backend ()->var_expression (compiled_param, locus);
+  CompilePatternBindings::Compile (&pattern, anon_param, ctx);
+}
+
+Bvariable *
+CompileSelfParam::compile (Context *ctx, tree fndecl, HIR::SelfParam &self,
+			   tree decl_type, Location locus)
+{
+  bool is_immutable
+    = self.get_self_kind () == HIR::SelfParam::ImplicitSelfKind::IMM
+      || self.get_self_kind () == HIR::SelfParam::ImplicitSelfKind::IMM_REF;
+  if (is_immutable)
+    decl_type = ctx->get_backend ()->immutable_type (decl_type);
+
+  return ctx->get_backend ()->parameter_variable (fndecl, "self", decl_type,
+						  locus);
+}
+
+} // namespace Compile
+} // namespace Rust