[PATCH 7/9] Add ptype support for DWARF-based fixed-point types

[Simon Marchi]

On 2020-11-08 1:30 a.m., Joel Brobecker wrote:
> diff --git a/gdb/testsuite/gdb.ada/fixed_points.exp b/gdb/testsuite/gdb.ada/fixed_points.exp
> index 655ee95..6455d35 100644
> --- a/gdb/testsuite/gdb.ada/fixed_points.exp
> +++ b/gdb/testsuite/gdb.ada/fixed_points.exp
> @@ -55,8 +55,47 @@ gdb_test "ptype Overprecise_Object" \
>  gdb_test "print fp1_var" \
>           " = 0.25"
>
> +set test "ptype fp1_var"
> +gdb_test_multiple "$test" $test {
> +    -re "type = <1-byte fixed point \\(small = 0\\.0625\\)>\r\n$gdb_prompt $" {
> +        pass $test
> +    }
> +    -re "type = delta 0\\.1 <'small = 0\\.0625>\r\n$gdb_prompt $" {
> +        # The (legacy) output we obtain when the compiler described
> +        # our fixed point types using the GNAT encodings rather than
> +        # standard DWARF.  OK as well.
> +        pass $test
> +    }
> +}

Instead of setting a "test" variable, you can use $gdb_test_name inside
gdb_test_multiple.

> diff --git a/gdb/testsuite/gdb.dwarf2/dw2-fixed-point.exp b/gdb/testsuite/gdb.dwarf2/dw2-fixed-point.exp
> index 27c549c..2e72bff 100644
> --- a/gdb/testsuite/gdb.dwarf2/dw2-fixed-point.exp
> +++ b/gdb/testsuite/gdb.dwarf2/dw2-fixed-point.exp
> @@ -142,3 +142,47 @@ gdb_test "print pck.fp1_range_var" \
>
>  gdb_test "print /x pck.fp1_range_var" \
>           " = 0x1"
> +
> +# Set the language to LANG and do a ptype test on pck__fp1_var,
> +# pck__fp2_var and pck__fp3_var, verifying that the output matches
> +# FP1_RE, FP2_RE, FP2_RE (resp.).
> +
> +proc do_ptype_test {lang fp1_re fp2_re fp3_re fp1_range_re} {
> +    with_test_prefix "$lang" {

Suggest using

  with_test_prefix "lang=$lang"

> +        gdb_test_no_output "set language $lang" \
> +            "set language to $lang for ptype test"
> +
> +        gdb_test "ptype pck__fp1_var" $fp1_re
> +
> +        gdb_test "ptype pck__fp2_var" $fp2_re
> +
> +        gdb_test "ptype pck__fp3_var" $fp3_re
> +
> +        if { $lang == "modula-2" || $lang == "pascal" } {
> +            setup_xfail "*-*-*" "not supported by language"
> +        }

Can you give more details about this?  What prevents these languages
from printing <range type>?  I'm confused, because as far as I can tell
C doesn't support range types more than these two languages, and it's
able to print <range type>.

> diff --git a/gdb/typeprint.h b/gdb/typeprint.h
> index 8936b9a..339c746 100644
> --- a/gdb/typeprint.h
> +++ b/gdb/typeprint.h
> @@ -151,6 +151,8 @@ class typedef_hash_table
>
>  void print_type_scalar (struct type * type, LONGEST, struct ui_file *);
>
> +void print_type_fixed_point (struct type *type, struct ui_file *stream);

For new code, IWBN to follow the standard of putting the doc in the
header file, even though the other functions in that file don't follow
it.

Simon