[Patch] Fortran: Fix func decl mismatch [PR93660]

[Tobias Burnus <tobias@codesourcery.com>]

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This fixes an ICE with OpenMP 'omp decare simd' but is a generic bug.

Namely TREE_TYPE(fndecl) has a mismatch to the arglist chain,
missing some hidden arguments with -fcoarray=lib.

OK for mainline and GCC 10?

Tobias

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Fortran: Fix func decl mismatch [PR93660]

gcc/fortran/ChangeLog:

	PR fortran/93660
	* trans-decl.c (build_function_decl): Add comment;
	increment hidden_typelist for caf_token/caf_offset.
	* trans-types.c (gfc_get_function_type): Add comment;
	add missing caf_token/caf_offset args.

gcc/testsuite/ChangeLog:

	PR fortran/93660
	* gfortran.dg/gomp/declare-simd-coarray-lib.f90: New test.

 gcc/fortran/trans-decl.c                            |  6 +++++-
 gcc/fortran/trans-types.c                           | 21 ++++++++++++++++++++-
 .../gfortran.dg/gomp/declare-simd-coarray-lib.f90   | 12 ++++++++++++
 3 files changed, 37 insertions(+), 2 deletions(-)

diff --git a/gcc/fortran/trans-decl.c b/gcc/fortran/trans-decl.c
index 6a4ed9bbfdd..34a0d49bae7 100644
--- a/gcc/fortran/trans-decl.c
+++ b/gcc/fortran/trans-decl.c
@@ -2488,7 +2488,9 @@ build_function_decl (gfc_symbol * sym, bool global)
 }
 
 
-/* Create the DECL_ARGUMENTS for a procedure.  */
+/* Create the DECL_ARGUMENTS for a procedure.
+   NOTE: The arguments added here must match the argument type created by
+   gfc_get_function_type ().  */
 
 static void
 create_function_arglist (gfc_symbol * sym)
@@ -2807,6 +2809,7 @@ create_function_arglist (gfc_symbol * sym)
 	  DECL_ARG_TYPE (token) = TREE_VALUE (typelist);
 	  TREE_READONLY (token) = 1;
 	  hidden_arglist = chainon (hidden_arglist, token);
+	  hidden_typelist = TREE_CHAIN (hidden_typelist);
 	  gfc_finish_decl (token);
 
 	  offset = build_decl (input_location, PARM_DECL,
@@ -2832,6 +2835,7 @@ create_function_arglist (gfc_symbol * sym)
 	  DECL_ARG_TYPE (offset) = TREE_VALUE (typelist);
 	  TREE_READONLY (offset) = 1;
 	  hidden_arglist = chainon (hidden_arglist, offset);
+	  hidden_typelist = TREE_CHAIN (hidden_typelist);
 	  gfc_finish_decl (offset);
 	}
 
diff --git a/gcc/fortran/trans-types.c b/gcc/fortran/trans-types.c
index ccdc4687c39..bc7aac1f3d9 100644
--- a/gcc/fortran/trans-types.c
+++ b/gcc/fortran/trans-types.c
@@ -3011,6 +3011,10 @@ create_fn_spec (gfc_symbol *sym, tree fntype)
   return build_type_attribute_variant (fntype, tmp);
 }
 
+
+/* NOTE: The returned function type must match the argument list created by
+   create_function_arglist.  */
+
 tree
 gfc_get_function_type (gfc_symbol * sym, gfc_actual_arglist *actual_args,
 		       const char *fnspec)
@@ -3119,10 +3123,11 @@ gfc_get_function_type (gfc_symbol * sym, gfc_actual_arglist *actual_args,
         }
     }
 
-  /* Add hidden string length parameters.  */
+  /* Add hidden arguments.  */
   for (f = gfc_sym_get_dummy_args (sym); f; f = f->next)
     {
       arg = f->sym;
+      /* Add hidden string length parameters.  */
       if (arg && arg->ts.type == BT_CHARACTER && !sym->attr.is_bind_c)
 	{
 	  if (!arg->ts.deferred)
@@ -3145,6 +3150,20 @@ gfc_get_function_type (gfc_symbol * sym, gfc_actual_arglist *actual_args,
 	       && arg->ts.type != BT_CLASS
 	       && !gfc_bt_struct (arg->ts.type))
 	vec_safe_push (typelist, boolean_type_node);
+      /* Coarrays which are descriptorless or assumed-shape pass with
+	 -fcoarray=lib the token and the offset as hidden arguments.  */
+      else if (arg
+	       && flag_coarray == GFC_FCOARRAY_LIB
+	       && ((arg->ts.type != BT_CLASS
+		    && arg->attr.codimension
+		    && !arg->attr.allocatable)
+		   || (arg->ts.type == BT_CLASS
+		       && CLASS_DATA (arg)->attr.codimension
+		       && !CLASS_DATA (arg)->attr.allocatable)))
+	{
+	  vec_safe_push (typelist, pvoid_type_node);  /* caf_token.  */
+	  vec_safe_push (typelist, gfc_array_index_type);  /* caf_offset.  */
+	}
     }
 
   if (!vec_safe_is_empty (typelist)
diff --git a/gcc/testsuite/gfortran.dg/gomp/declare-simd-coarray-lib.f90 b/gcc/testsuite/gfortran.dg/gomp/declare-simd-coarray-lib.f90
new file mode 100644
index 00000000000..1f74da76ffe
--- /dev/null
+++ b/gcc/testsuite/gfortran.dg/gomp/declare-simd-coarray-lib.f90
@@ -0,0 +1,12 @@
+! { dg-additional-options "-fcoarray=lib" }
+!
+! PR fortran/93660
+!
+! Failed as TREE_TYPE(fndecl) did not include the
+! hidden caf_token/caf_offset arguments.
+!
+integer function f(x)
+   integer :: x[*]
+   !$omp declare simd
+   f = x[1]
+end