[gdb/exp] Fix gdb.fortran/intrinsics.exp fail on arm

When running test-case gdb.fortran/intrinsics.exp on arm-linux, I get:
...
(gdb) p cmplx (4,4,16)^M
/home/linux/gdb/src/gdb/f-lang.c:1002: internal-error: eval_op_f_cmplx: \
  Assertion `kind_arg->code () == TYPE_CODE_COMPLEX' failed.^M
A problem internal to GDB has been detected,^M
further debugging may prove unreliable.^M
----- Backtrace -----^M
FAIL: gdb.fortran/intrinsics.exp: p cmplx (4,4,16) (GDB internal error)
...

The problem is that 16-byte floats are unsupported:
...
$ gfortran test.f90
test.f90:2:17:

    2 |     REAL(kind=16) :: foo = 1
      |                 1
Error: Kind 16 not supported for type REAL at (1)
...
and consequently we end up with a builtin_real_s16 and builtin_complex_s16 with
code TYPE_CODE_ERROR.

Fix this by bailing out asap when encountering such a type.

Without this patch we're able to do the rather useless:
...
(gdb) ptype real*16
type = real*16
(gdb) ptype real_16
type = real*16
...
but with this patch we get:
...
(gdb) ptype real*16
unsupported kind 16 for type real*4
(gdb) ptype real_16
unsupported type real*16
...

Tested on arm-linux.

PR fortran/30537
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=30537

4 files changed, 70 insertions, 18 deletions

diff --git a/gdb/f-exp.y b/gdb/f-exp.y
index bdf9c32..259f274 100644
--- a/gdb/f-exp.y
+++ b/gdb/f-exp.y
@@ -754,7 +754,11 @@ typebase  /* Implements (approximately): (type-qualifier)* type-specifier */
 	|       REAL_S8_KEYWORD
 			{ $$ = parse_f_type (pstate)->builtin_real_s8; }
 	|	REAL_S16_KEYWORD
-			{ $$ = parse_f_type (pstate)->builtin_real_s16; }
+			{ $$ = parse_f_type (pstate)->builtin_real_s16;
+			  if ($$->code () == TYPE_CODE_ERROR)
+			    error (_("unsupported type %s"),
+				   TYPE_SAFE_NAME ($$));
+			}
 	|	COMPLEX_KEYWORD
 			{ $$ = parse_f_type (pstate)->builtin_complex; }
 	|	COMPLEX_S4_KEYWORD
@@ -762,7 +766,11 @@ typebase  /* Implements (approximately): (type-qualifier)* type-specifier */
 	|	COMPLEX_S8_KEYWORD
 			{ $$ = parse_f_type (pstate)->builtin_complex_s8; }
 	|	COMPLEX_S16_KEYWORD 
-			{ $$ = parse_f_type (pstate)->builtin_complex_s16; }
+			{ $$ = parse_f_type (pstate)->builtin_complex_s16;
+			  if ($$->code () == TYPE_CODE_ERROR)
+			    error (_("unsupported type %s"),
+				   TYPE_SAFE_NAME ($$));
+			}
 	|	SINGLE PRECISION
 			{ $$ = parse_f_type (pstate)->builtin_real;}
 	|	DOUBLE PRECISION
@@ -1156,12 +1164,9 @@ push_kind_type (LONGEST val, struct type *type)
   type_stack->push (tp_kind);
 }
 
-/* Called when a type has a '(kind=N)' modifier after it, for example
-   'character(kind=1)'.  The BASETYPE is the type described by 'character'
-   in our example, and KIND is the integer '1'.  This function returns a
-   new type that represents the basetype of a specific kind.  */
+/* Helper function for convert_to_kind_type.  */
 static struct type *
-convert_to_kind_type (struct type *basetype, int kind)
+convert_to_kind_type_1 (struct type *basetype, int kind)
 {
   if (basetype == parse_f_type (pstate)->builtin_character)
     {
@@ -1211,13 +1216,25 @@ convert_to_kind_type (struct type *basetype, int kind)
 	return parse_f_type (pstate)->builtin_integer_s8;
     }
 
-  error (_("unsupported kind %d for type %s"),
-	 kind, TYPE_SAFE_NAME (basetype));
-
-  /* Should never get here.  */
   return nullptr;
 }
 
+/* Called when a type has a '(kind=N)' modifier after it, for example
+   'character(kind=1)'.  The BASETYPE is the type described by 'character'
+   in our example, and KIND is the integer '1'.  This function returns a
+   new type that represents the basetype of a specific kind.  */
+static struct type *
+convert_to_kind_type (struct type *basetype, int kind)
+{
+  struct type *res = convert_to_kind_type_1 (basetype, kind);
+
+  if (res == nullptr || res->code () == TYPE_CODE_ERROR)
+    error (_("unsupported kind %d for type %s"),
+	   kind, TYPE_SAFE_NAME (basetype));
+
+  return res;
+}
+
 struct f_token
 {
   /* The string to match against.  */
diff --git a/gdb/testsuite/gdb.fortran/intrinsics.exp b/gdb/testsuite/gdb.fortran/intrinsics.exp
index 60c79f9..060bb53 100644
--- a/gdb/testsuite/gdb.fortran/intrinsics.exp
+++ b/gdb/testsuite/gdb.fortran/intrinsics.exp
@@ -112,10 +112,14 @@ gdb_test "ptype cmplx (4,4)" "= complex\\*4"
 gdb_test "p cmplx (-14,-4)" "= \\(-14,-4\\)"
 gdb_test "p cmplx (4,4,4)" "\\(4,4\\)"
 gdb_test "p cmplx (4,4,8)" "\\(4,4\\)"
-gdb_test "p cmplx (4,4,16)" "\\(4,4\\)"
+set re_unsupported_kind_16 \
+    [string_to_regexp "unsupported kind 16 for type complex*4"]
+gdb_test "p cmplx (4,4,16)" \
+    ([string_to_regexp " = (4,4)"]|$re_unsupported_kind_16)
 gdb_test "ptype cmplx (4,4,4)" "= complex\\*4"
 gdb_test "ptype cmplx (4,4,8)" "= complex\\*8"
-gdb_test "ptype cmplx (4,4,16)" "= complex\\*16"
+gdb_test "ptype cmplx (4,4,16)" \
+    ([string_to_regexp " = complex*16"]|$re_unsupported_kind_16)
 
 gdb_test "p cmplx (4,4,1)" "unsupported kind 1 for type complex\\*4"
 gdb_test "p cmplx (4,4,-1)" "unsupported kind -1 for type complex\\*4"
diff --git a/gdb/testsuite/gdb.fortran/type-kinds.exp b/gdb/testsuite/gdb.fortran/type-kinds.exp
index ab5f19f..a6f2aa4 100644
--- a/gdb/testsuite/gdb.fortran/type-kinds.exp
+++ b/gdb/testsuite/gdb.fortran/type-kinds.exp
@@ -43,12 +43,20 @@ proc test_basic_parsing_of_type_kinds {} {
     test_cast_1_to_type_kind "complex" "" "\\(1,0\\)" "8"
     test_cast_1_to_type_kind "complex" "4" "\\(1,0\\)" "8"
     test_cast_1_to_type_kind "complex" "8" "\\(1,0\\)" "16"
-    test_cast_1_to_type_kind "complex" "16" "\\(1,0\\)" "32"
+    set re_unsupported_kind \
+	[string_to_regexp "unsupported kind 16 for type complex*4"]
+    test_cast_1_to_type_kind "complex" "16" \
+	[string_to_regexp (1,0)]|$re_unsupported_kind \
+	32|$re_unsupported_kind
 
     test_cast_1_to_type_kind "real" "" "1" "4"
     test_cast_1_to_type_kind "real" "4" "1" "4"
     test_cast_1_to_type_kind "real" "8" "1" "8"
-    test_cast_1_to_type_kind "real" "16" "1" "16"
+    set re_unsupported_kind \
+	[string_to_regexp "unsupported kind 16 for type real*4"]
+    test_cast_1_to_type_kind "real" "16" \
+	1|$re_unsupported_kind \
+	16|$re_unsupported_kind
 
     test_cast_1_to_type_kind "logical" "" "\\.TRUE\\." "4"
     test_cast_1_to_type_kind "logical" "1" "\\.TRUE\\." "1"
@@ -83,11 +91,17 @@ proc test_old_star_type_sizes {} {
 
     gdb_test "p ((complex*4) 1)" " = \\(1,0\\)"
     gdb_test "p ((complex*8) 1)" " = \\(1,0\\)"
-    gdb_test "p ((complex*16) 1)" " = \\(1,0\\)"
+    set re_unsupported_kind \
+	[string_to_regexp "unsupported kind 16 for type complex*4"]
+    gdb_test "p ((complex*16) 1)" \
+	[string_to_regexp " = (1,0)"]|$re_unsupported_kind
 
     gdb_test "p ((real*4) 1)" " = 1"
     gdb_test "p ((real*8) 1)" " = 1"
-    gdb_test "p ((real*16) 1)" " = 1"
+    set re_unsupported_kind \
+	[string_to_regexp "unsupported kind 16 for type real*4"]
+    gdb_test "p ((real*16) 1)" \
+	"( = 1|$re_unsupported_kind)"
 
     gdb_test "p ((logical*1) 1)" " = \\.TRUE\\."
     gdb_test "p ((logical*4) 1)" " = \\.TRUE\\."
diff --git a/gdb/testsuite/gdb.fortran/types.exp b/gdb/testsuite/gdb.fortran/types.exp
index 83b1098..edbf5ab 100644
--- a/gdb/testsuite/gdb.fortran/types.exp
+++ b/gdb/testsuite/gdb.fortran/types.exp
@@ -94,7 +94,24 @@ proc test_primitive_types_known {} {
 	# While TYPE_KIND is allowed as input, GDB will always return the
 	# Fortran notation TYPE*KIND
 	regsub -all "_" $type "\*" type_res
-	gdb_test "ptype $type" [string_to_regexp "type = $type_res"]
+	set re [string_to_regexp "type = $type_res"]
+	switch $type {
+	    real*16 - complex*16 {
+		regexp {^[^*_]*} $type base
+		set re_unsupported \
+		    [string_to_regexp \
+			 "unsupported kind 16 for type $base*4"]
+		set re ($re|$re_unsupported)
+	    }
+	    real_16 - complex_16 {
+		set re_unsupported \
+		    [string_to_regexp \
+			 "unsupported type $type_res"]
+		set re ($re|$re_unsupported)
+	    }
+	}
+
+	gdb_test "ptype $type" $re
     }
 }