HIR Visitor refactoring

This change split the single HIR visitor in smaller abstract ones:
- Stmt
- VisItem
- Pattern
- ExternalItem
- Impl
- Type
- Expression

Instead of providing a Base class with empty visit() methods, they are kept
abstract to avoid the case where a missing visit() is silently ignored:
implementors must explicitely override all visit.

There is also a FullVisitor that covers all HIR nodes and also provides a Base
class with empty behavior.

fixes #825

Signed-off-by: Marc Poulhiès <dkm@kataplop.net>

1 files changed, 56 insertions, 5 deletions

diff --git a/gcc/rust/backend/rust-compile-struct-field-expr.h b/gcc/rust/backend/rust-compile-struct-field-expr.h
index 0570973..c5e986e 100644
--- a/gcc/rust/backend/rust-compile-struct-field-expr.h
+++ b/gcc/rust/backend/rust-compile-struct-field-expr.h
@@ -25,10 +25,9 @@
 namespace Rust {
 namespace Compile {
 
-class CompileStructExprField : public HIRCompileBase
+class CompileStructExprField : public HIRCompileBase,
+			       public HIR::HIRExpressionVisitor
 {
-  using Rust::Compile::HIRCompileBase::visit;
-
 public:
   static tree Compile (HIR::StructExprField *field, Context *ctx)
   {
@@ -39,11 +38,63 @@ public:
   }
 
   void visit (HIR::StructExprFieldIdentifierValue &field) override;
-
   void visit (HIR::StructExprFieldIndexValue &field) override;
-
   void visit (HIR::StructExprFieldIdentifier &field) override;
 
+  // Empty visit for unused Expression HIR nodes.
+  void visit (HIR::PathInExpression &) override {}
+  void visit (HIR::QualifiedPathInExpression &) override {}
+  void visit (HIR::ClosureExprInner &) override {}
+  void visit (HIR::ClosureExprInnerTyped &) override {}
+  void visit (HIR::StructExprStruct &) override {}
+  void visit (HIR::StructExprStructFields &) override {}
+  void visit (HIR::IdentifierExpr &) override {}
+  void visit (HIR::LiteralExpr &) override {}
+  void visit (HIR::BorrowExpr &) override {}
+  void visit (HIR::DereferenceExpr &) override {}
+  void visit (HIR::ErrorPropagationExpr &) override {}
+  void visit (HIR::NegationExpr &) override {}
+  void visit (HIR::ArithmeticOrLogicalExpr &) override {}
+  void visit (HIR::ComparisonExpr &) override {}
+  void visit (HIR::LazyBooleanExpr &) override {}
+  void visit (HIR::TypeCastExpr &) override {}
+  void visit (HIR::AssignmentExpr &) override {}
+  void visit (HIR::CompoundAssignmentExpr &) override {}
+  void visit (HIR::GroupedExpr &) override {}
+  void visit (HIR::ArrayExpr &) override {}
+  void visit (HIR::ArrayIndexExpr &) override {}
+  void visit (HIR::TupleExpr &) override {}
+  void visit (HIR::TupleIndexExpr &) override {}
+  void visit (HIR::CallExpr &) override {}
+  void visit (HIR::MethodCallExpr &) override {}
+  void visit (HIR::FieldAccessExpr &) override {}
+  void visit (HIR::BlockExpr &) override {}
+  void visit (HIR::ContinueExpr &) override {}
+  void visit (HIR::BreakExpr &) override {}
+  void visit (HIR::RangeFromToExpr &) override {}
+  void visit (HIR::RangeFromExpr &) override {}
+  void visit (HIR::RangeToExpr &) override {}
+  void visit (HIR::RangeFullExpr &) override {}
+  void visit (HIR::RangeFromToInclExpr &) override {}
+  void visit (HIR::RangeToInclExpr &) override {}
+  void visit (HIR::ReturnExpr &) override {}
+  void visit (HIR::UnsafeBlockExpr &) override {}
+  void visit (HIR::LoopExpr &) override {}
+  void visit (HIR::WhileLoopExpr &) override {}
+  void visit (HIR::WhileLetLoopExpr &) override {}
+  void visit (HIR::ForLoopExpr &) override {}
+  void visit (HIR::IfExpr &) override {}
+  void visit (HIR::IfExprConseqElse &) override {}
+  void visit (HIR::IfExprConseqIf &) override {}
+  void visit (HIR::IfExprConseqIfLet &) override {}
+  void visit (HIR::IfLetExpr &) override {}
+  void visit (HIR::IfLetExprConseqElse &) override {}
+  void visit (HIR::IfLetExprConseqIf &) override {}
+  void visit (HIR::IfLetExprConseqIfLet &) override {}
+  void visit (HIR::MatchExpr &) override {}
+  void visit (HIR::AwaitExpr &) override {}
+  void visit (HIR::AsyncBlockExpr &) override {}
+
 private:
   CompileStructExprField (Context *ctx)
     : HIRCompileBase (ctx), translated (nullptr)