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Handle T_HRESULT types in CodeView records

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Follow MSVC in having a special type value, T_HRESULT, for (signed)
longs that have been typedef'd with the name "HRESULT". This is so that
the debugger can display user-friendly constant names when debugging COM
code.

gcc/
	* dwarf2codeview.cc (get_type_num_typedef): New function.
	(get_type_num): Call get_type_num_typedef.
	* dwarf2codeview.h (T_HRESULT): Define.
This commit is contained in:
Mark Harmstone 2024-11-02 15:31:12 +00:00
parent b0f4f556ea
commit 6177b45fcd
2 changed files with 25 additions and 3 deletions
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27
gcc/dwarf2codeview.cc
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@ -6220,6 +6220,29 @@ get_type_num_ptr_to_member_type (dw_die_ref type, bool in_struct)
return ct->num; return ct->num;
} }
/* Return the type number that corresponds to a DW_TAG_typedef DIE: either the
type number of the base type, or follow MSVC in having a special value
for the HRESULT used by COM. */
static uint32_t
get_type_num_typedef (dw_die_ref type, bool in_struct)
{
uint32_t num;
num = get_type_num (get_AT_ref (type, DW_AT_type), in_struct, false);
if (num == T_LONG)
{
const char *name = get_AT_string (type, DW_AT_name);
/* longs typedef'd as "HRESULT" get their own type */
if (name && !strcmp (name, "HRESULT"))
num = T_HRESULT;
}
return num;
}
/* Process a DIE representing a type definition, add a CodeView type if /* Process a DIE representing a type definition, add a CodeView type if
necessary, and return its number. If it's something we can't handle, return necessary, and return its number. If it's something we can't handle, return
0. We keep a hash table so that we're not adding the same type multiple 0. We keep a hash table so that we're not adding the same type multiple
@ -6254,9 +6277,7 @@ get_type_num (dw_die_ref type, bool in_struct, bool no_fwd_ref)
break; break;
case DW_TAG_typedef: case DW_TAG_typedef:
/* FIXME - signed longs typedef'd as "HRESULT" should get their num = get_type_num_typedef (type, in_struct);
own type (T_HRESULT) */
num = get_type_num (get_AT_ref (type, DW_AT_type), in_struct, false);
break; break;
case DW_TAG_pointer_type: case DW_TAG_pointer_type:

1
gcc/dwarf2codeview.h
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@ -26,6 +26,7 @@ along with GCC; see the file COPYING3. If not see
/* Constants for in-built types. */ /* Constants for in-built types. */
#define T_VOID 0x0003 #define T_VOID 0x0003
#define T_HRESULT 0x0008
#define T_CHAR 0x0010 #define T_CHAR 0x0010
#define T_SHORT 0x0011 #define T_SHORT 0x0011
#define T_LONG 0x0012 #define T_LONG 0x0012