https://gcc.gnu.org/g:14d706ed0e90373c98a0ce223ffeea8846f6d9bc
commit r15-5433-g14d706ed0e90373c98a0ce223ffeea8846f6d9bc
Author: Mark Harmstone <m...@harmstone.com>
Date: Tue Nov 19 00:46:45 2024 +0000
Produce CodeView info about nested types
If the DIE for a struct, class, or union contains a nested type, add a
LF_NESTTYPE entry to its field list recording this.
Plus if we use a nested type, make sure that its parent also gets
defined. This may entail adding a forward definition and creating a
deferred type, so we need to call flush_deferred_types in
codeview_debug_finish as well.
gcc/
* dwarf2codeview.cc (enum cv_leaf_type): Add LF_NESTTYPE.
(struct codeview_subtype): Add lf_nesttype to union.
(flush_deferred_types): Add declaration.
(write_lf_fieldlist): Handle LF_NESTTYPE.
(codeview_debug_finish): Call flush_deferred_types.
(add_struct_nested_type): New function.
(get_type_num_struct): Call add_struct_nested_type, and if nested
make
that parent is added.
Diff:
---
gcc/dwarf2codeview.cc | 89 ++++++++++++++++++++++++++++++++++++++++++++++++++-
1 file changed, 88 insertions(+), 1 deletion(-)
diff --git a/gcc/dwarf2codeview.cc b/gcc/dwarf2codeview.cc
index 5e8a4ab39e7d..ccb1109611c9 100644
--- a/gcc/dwarf2codeview.cc
+++ b/gcc/dwarf2codeview.cc
@@ -111,6 +111,7 @@ enum cv_leaf_type {
LF_MEMBER = 0x150d,
LF_STMEMBER = 0x150e,
LF_METHOD = 0x150f,
+ LF_NESTTYPE = 0x1510,
LF_ONEMETHOD = 0x1511,
LF_FUNC_ID = 0x1601,
LF_MFUNC_ID = 0x1602,
@@ -1249,6 +1250,11 @@ struct codeview_subtype
uint32_t base_class_type;
codeview_integer offset;
} lf_bclass;
+ struct
+ {
+ uint32_t type;
+ char *name;
+ } lf_nesttype;
};
};
@@ -1432,6 +1438,7 @@ static uint32_t get_type_num_subroutine_type (dw_die_ref
type, bool in_struct,
uint32_t this_type,
int32_t this_adjustment);
static void write_cv_padding (size_t padding);
+static void flush_deferred_types (void);
/* Record new line number against the current function. */
@@ -3904,6 +3911,40 @@ write_lf_fieldlist (codeview_custom_type *t)
write_cv_padding (4 - (leaf_len % 4));
break;
+ case LF_NESTTYPE:
+ /* This is lf_nest_type in binutils and lfNestType in Microsoft's
+ cvinfo.h:
+
+ struct lf_nest_type
+ {
+ uint16_t kind;
+ uint16_t padding;
+ uint32_t type;
+ char name[];
+ } ATTRIBUTE_PACKED;
+ */
+
+ fputs (integer_asm_op (2, false), asm_out_file);
+ fprint_whex (asm_out_file, LF_NESTTYPE);
+ putc ('\n', asm_out_file);
+
+ fputs (integer_asm_op (2, false), asm_out_file);
+ fprint_whex (asm_out_file, 0);
+ putc ('\n', asm_out_file);
+
+ fputs (integer_asm_op (4, false), asm_out_file);
+ fprint_whex (asm_out_file, v->lf_nesttype.type);
+ putc ('\n', asm_out_file);
+
+ name_len = strlen (v->lf_nesttype.name) + 1;
+ ASM_OUTPUT_ASCII (asm_out_file, v->lf_nesttype.name, name_len);
+
+ leaf_len = 8 + name_len;
+ write_cv_padding (4 - (leaf_len % 4));
+
+ free (v->lf_nesttype.name);
+ break;
+
default:
break;
}
@@ -4673,6 +4714,12 @@ codeview_debug_finish (void)
write_line_numbers ();
write_codeview_symbols ();
+ /* If we reference a nested struct but not its parent, add_deferred_type
+ gets called if we create a forward reference for this, even though we've
+ already flushed this in codeview_debug_early_finish. In this case we will
+ need to flush this list again. */
+ flush_deferred_types ();
+
if (custom_types)
write_custom_types ();
@@ -5638,6 +5685,32 @@ is_templated_func (dw_die_ref die)
return false;
}
+/* Create a field list subtype that records that a struct has a nested type
+ contained within it. */
+
+static void
+add_struct_nested_type (dw_die_ref c, codeview_subtype **el, size_t *el_len)
+{
+ const char *name = get_AT_string (c, DW_AT_name);
+ size_t name_len;
+
+ if (!name)
+ return;
+
+ name_len = strlen (name);
+
+ *el = (codeview_subtype *) xmalloc (sizeof (**el));
+ (*el)->next = NULL;
+ (*el)->kind = LF_NESTTYPE;
+ (*el)->lf_nesttype.type = get_type_num (c, true, false);
+ (*el)->lf_nesttype.name = xstrdup (name);
+
+ *el_len = 9 + name_len;
+
+ if (*el_len % 4)
+ *el_len += 4 - (*el_len % 4);
+}
+
/* Process a DW_TAG_structure_type, DW_TAG_class_type, or DW_TAG_union_type
DIE, add an LF_FIELDLIST and an LF_STRUCTURE / LF_CLASS / LF_UNION type,
and return the number of the latter. */
@@ -5645,11 +5718,18 @@ is_templated_func (dw_die_ref die)
static uint32_t
get_type_num_struct (dw_die_ref type, bool in_struct, bool *is_fwd_ref)
{
- dw_die_ref first_child;
+ dw_die_ref parent, first_child;
codeview_custom_type *ct;
uint16_t num_members = 0;
uint32_t last_type = 0;
+ parent = dw_get_die_parent(type);
+
+ if (parent && (dw_get_die_tag (parent) == DW_TAG_structure_type
+ || dw_get_die_tag (parent) == DW_TAG_class_type
+ || dw_get_die_tag (parent) == DW_TAG_union_type))
+ get_type_num (parent, true, false);
+
if ((in_struct && get_AT_string (type, DW_AT_name))
|| get_AT_flag (type, DW_AT_declaration))
{
@@ -5769,6 +5849,13 @@ get_type_num_struct (dw_die_ref type, bool in_struct,
bool *is_fwd_ref)
add_struct_inheritance (c, accessibility, &el, &el_len);
break;
+ case DW_TAG_structure_type:
+ case DW_TAG_class_type:
+ case DW_TAG_union_type:
+ case DW_TAG_enumeration_type:
+ add_struct_nested_type (c, &el, &el_len);
+ break;
+
default:
break;
}
