[COMMITTED 023/101] gccrs: Add ast validation check on union variant number

[arthur . cohen]

From: Pierre-Emmanuel Patry <pierre-emmanuel.pa...@embecosm.com>

Unions with zero fields are forbidden. Add regression test for empty
unions.

gcc/rust/ChangeLog:

        * checks/errors/rust-ast-validation.cc (ASTValidation::visit): Add
        zero field check during ast validation pass.
        * checks/errors/rust-ast-validation.h: Add union visit function
        prototype.

gcc/testsuite/ChangeLog:

        * rust/compile/const_generics_8.rs: Fill the union with dummy values.
        * rust/compile/empty_union.rs: New test.

Signed-off-by: Pierre-Emmanuel Patry <pierre-emmanuel.pa...@embecosm.com>
---
 gcc/rust/checks/errors/rust-ast-validation.cc  | 10 ++++++++++
 gcc/rust/checks/errors/rust-ast-validation.h   |  2 ++
 gcc/testsuite/rust/compile/const_generics_8.rs |  7 ++++++-
 gcc/testsuite/rust/compile/empty_union.rs      |  2 ++
 4 files changed, 20 insertions(+), 1 deletion(-)
 create mode 100644 gcc/testsuite/rust/compile/empty_union.rs

diff --git a/gcc/rust/checks/errors/rust-ast-validation.cc 
b/gcc/rust/checks/errors/rust-ast-validation.cc
index 4142cc6317e..dad7f5edded 100644
--- a/gcc/rust/checks/errors/rust-ast-validation.cc
+++ b/gcc/rust/checks/errors/rust-ast-validation.cc
@@ -18,6 +18,7 @@
 
 #include "rust-ast-validation.h"
 #include "rust-diagnostics.h"
+#include "rust-item.h"
 #include "rust-keyword-values.h"
 
 namespace Rust {
@@ -81,6 +82,15 @@ ASTValidation::visit (AST::ExternalFunctionItem &item)
   AST::ContextualASTVisitor::visit (item);
 }
 
+void
+ASTValidation::visit (AST::Union &item)
+{
+  if (item.get_variants ().empty ())
+    rust_error_at (item.get_locus (), "unions cannot have zero fields");
+
+  AST::ContextualASTVisitor::visit (item);
+}
+
 void
 ASTValidation::visit (AST::Function &function)
 {
diff --git a/gcc/rust/checks/errors/rust-ast-validation.h 
b/gcc/rust/checks/errors/rust-ast-validation.h
index 49133ee0c3d..1052168ea72 100644
--- a/gcc/rust/checks/errors/rust-ast-validation.h
+++ b/gcc/rust/checks/errors/rust-ast-validation.h
@@ -21,6 +21,7 @@
 
 #include "rust-ast-visitor.h"
 #include "rust-ast-full.h"
+#include "rust-item.h"
 
 namespace Rust {
 
@@ -37,6 +38,7 @@ public:
   virtual void visit (AST::Lifetime &lifetime);
   virtual void visit (AST::LoopLabel &label);
   virtual void visit (AST::ExternalFunctionItem &item);
+  virtual void visit (AST::Union &item);
   virtual void visit (AST::Function &function);
   virtual void visit (AST::Trait &trait);
 };
diff --git a/gcc/testsuite/rust/compile/const_generics_8.rs 
b/gcc/testsuite/rust/compile/const_generics_8.rs
index c7810830f46..bb34652b9a6 100644
--- a/gcc/testsuite/rust/compile/const_generics_8.rs
+++ b/gcc/testsuite/rust/compile/const_generics_8.rs
@@ -8,7 +8,12 @@ enum Bidoule<const N: i32 = 15> {}
 type Bipboupe<const N: i32 = 15> = Bidule;
 trait Fooable<const N: i32 = 15> {}
 
-union Bidoulepe<const N: i32 = 15> {} // { dg-error "default values for const 
generic parameters are not allowed in .union. items" }
+union Bidoulepe<const N: i32 = 15> {
+    // { dg-error "default values for const generic parameters are not allowed 
in .union. items"  "" {target *-*-* } .-1 }
+    int: i32,
+    float: f32,
+}
+
 fn const_default<const N: i32 = 15>() {} // { dg-error "default values for 
const generic parameters are not allowed in .function. items" }
 
 // Note - missing generic parameter - needs name resolution on const generics
diff --git a/gcc/testsuite/rust/compile/empty_union.rs 
b/gcc/testsuite/rust/compile/empty_union.rs
new file mode 100644
index 00000000000..6114df5d9c0
--- /dev/null
+++ b/gcc/testsuite/rust/compile/empty_union.rs
@@ -0,0 +1,2 @@
+#[repr(C)]
+union MyUnion {} // { dg-error "unions cannot have zero fields" }
-- 
2.42.1