[binutils-gdb] gdb: LoongArch: Add support for static data member in struct

[Tiezhu Yang <yangtiezhu@sourceware.org>]

https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=78c7a5288e2ba8c9fd00ee948d1f20e4decb800c

commit 78c7a5288e2ba8c9fd00ee948d1f20e4decb800c
Author: Hui Li <lihui@loongson.cn>
Date:   Fri Feb 24 06:47:39 2023 +0800

    gdb: LoongArch: Add support for static data member in struct
    
    As described in C++ reference [1], static data members are not part
    of objects of a given class type. Modified compute_struct_member ()
    to ignore static data member so that we can get the expected result.
    
    loongson@linux:~$ cat test.c
    #include<stdio.h>
    struct struct_01 { static unsigned a; float b;};
    unsigned struct_01::a = 66;
    struct struct_01 struct_01_val = { 99.00 };
    int check_arg_struct(struct struct_01 arg)
      {
        printf("arg.a = %d\n", arg.a);
        printf("arg.b = %f\n", arg.b);
        return 0;
      }
    int main()
      {
        check_arg_struct(struct_01_val);
        return 0;
      }
    loongson@linux:~$ g++ -g test.c -o test++
    loongson@linux:~$ gdb test++
    
    Without this patch:
    ...
    (gdb) start
    ...
    (gdb) p check_arg_struct(struct_01_val)
    arg.a = 66
    arg.b = 0.000000
    $1 = 0
    
    With this patch:
    ...
    (gdb) start
    ...
    (gdb) p check_arg_struct(struct_01_val)
    arg.a = 66
    arg.b = 99.000000
    $1 = 0
    
    [1] https://learn.microsoft.com/en-us/cpp/cpp/static-members-cpp?view=msvc-170
    
    Signed-off-by: Hui Li <lihui@loongson.cn>
    Reviewed-By: Tom Tromey <tom@tromey.com>
    Signed-off-by: Tiezhu Yang <yangtiezhu@loongson.cn>

Diff:
---
 gdb/loongarch-tdep.c | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/gdb/loongarch-tdep.c b/gdb/loongarch-tdep.c
index f5ddad0ba65..b380bd7e2d4 100644
--- a/gdb/loongarch-tdep.c
+++ b/gdb/loongarch-tdep.c
@@ -520,6 +520,10 @@ compute_struct_member (struct type *type,
 {
   for (int i = 0; i < type->num_fields (); i++)
     {
+      /* Ignore any static fields.  */
+      if (field_is_static (&type->field (i)))
+	continue;
+
       struct type *field_type = check_typedef (type->field (i).type ());
 
       if (field_type->code () == TYPE_CODE_INT