[committed 30/88] gccrs: Implement lowering ReferencePattern from AST to HIR

[arthur . cohen]

From: Owen Avery <powerboat9.ga...@gmail.com>

gcc/rust/ChangeLog:

        * ast/rust-pattern.h:
        (ReferencePattern::is_double_reference): Add method.
        (ReferencePattern::get_is_mut): Add method.
        * hir/rust-ast-lower-pattern.cc
        (ASTLoweringPattern::visit): Add ReferencePattern visitor.
        * hir/rust-ast-lower-pattern.h:
        (ASTLoweringPattern::visit): Add ReferencePattern visitor.

Signed-off-by: Owen Avery <powerboat9.ga...@gmail.com>
---
 gcc/rust/ast/rust-pattern.h            |  4 ++++
 gcc/rust/hir/rust-ast-lower-pattern.cc | 29 ++++++++++++++++++++++++++
 gcc/rust/hir/rust-ast-lower-pattern.h  |  1 +
 3 files changed, 34 insertions(+)

diff --git a/gcc/rust/ast/rust-pattern.h b/gcc/rust/ast/rust-pattern.h
index c86bdf6f820..cf5d2ead10d 100644
--- a/gcc/rust/ast/rust-pattern.h
+++ b/gcc/rust/ast/rust-pattern.h
@@ -469,6 +469,10 @@ public:
     return pattern;
   }
 
+  bool is_double_reference () const { return has_two_amps; }
+
+  bool get_is_mut () const { return is_mut; }
+
   NodeId get_node_id () const { return node_id; }
 
   NodeId get_pattern_node_id () const override final { return node_id; }
diff --git a/gcc/rust/hir/rust-ast-lower-pattern.cc 
b/gcc/rust/hir/rust-ast-lower-pattern.cc
index a0fd8dded38..1961c740624 100644
--- a/gcc/rust/hir/rust-ast-lower-pattern.cc
+++ b/gcc/rust/hir/rust-ast-lower-pattern.cc
@@ -249,5 +249,34 @@ ASTLoweringPattern::visit (AST::GroupedPattern &pattern)
   pattern.get_pattern_in_parens ()->accept_vis (*this);
 }
 
+void
+ASTLoweringPattern::visit (AST::ReferencePattern &pattern)
+{
+  auto crate_num = mappings->get_current_crate ();
+  Analysis::NodeMapping mapping (crate_num, pattern.get_node_id (),
+                                mappings->get_next_hir_id (crate_num),
+                                UNKNOWN_LOCAL_DEFID);
+
+  HIR::Pattern *inner
+    = ASTLoweringPattern::translate (pattern.get_referenced_pattern ().get ());
+
+  translated
+    = new HIR::ReferencePattern (mapping, std::unique_ptr<HIR::Pattern> 
(inner),
+                                pattern.get_is_mut () ? Mutability::Mut
+                                                      : Mutability::Imm,
+                                pattern.get_locus ());
+
+  if (pattern.is_double_reference ())
+    {
+      Analysis::NodeMapping mapping2 (crate_num, pattern.get_node_id (),
+                                     mappings->get_next_hir_id (crate_num),
+                                     UNKNOWN_LOCAL_DEFID);
+      translated
+       = new HIR::ReferencePattern (mapping2,
+                                    std::unique_ptr<HIR::Pattern> (translated),
+                                    Mutability::Imm, pattern.get_locus ());
+    }
+}
+
 } // namespace HIR
 } // namespace Rust
diff --git a/gcc/rust/hir/rust-ast-lower-pattern.h 
b/gcc/rust/hir/rust-ast-lower-pattern.h
index 0075e27e9c0..2d175a25cb4 100644
--- a/gcc/rust/hir/rust-ast-lower-pattern.h
+++ b/gcc/rust/hir/rust-ast-lower-pattern.h
@@ -40,6 +40,7 @@ public:
   void visit (AST::LiteralPattern &pattern) override;
   void visit (AST::RangePattern &pattern) override;
   void visit (AST::GroupedPattern &pattern) override;
+  void visit (AST::ReferencePattern &pattern) override;
 
 private:
   ASTLoweringPattern ();
-- 
2.40.0