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dwarfindex: index enumerator names

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The enumerator DIE itself doesn't let us get at the type, though, so
hack it to point at the enumeration_type DIE.
This commit is contained in:
Omar Sandoval 2018-06-28 21:47:27 -07:00
parent cea27cc0a0
commit d9e6fa94b5
1 changed files with 26 additions and 4 deletions
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30
drgn/dwarfindex.c
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@ -29,6 +29,7 @@ enum {
DW_TAG_typedef = 0x16,
DW_TAG_union_type = 0x17,
DW_TAG_base_type = 0x24,
DW_TAG_enumerator = 0x28,
DW_TAG_variable = 0x34,
};
@ -813,6 +814,7 @@ static int read_abbrev_decl(const char **ptr, const char *end,
tag != DW_TAG_class_type &&
tag != DW_TAG_compile_unit &&
tag != DW_TAG_enumeration_type &&
tag != DW_TAG_enumerator &&
tag != DW_TAG_structure_type &&
tag != DW_TAG_typedef &&
tag != DW_TAG_union_type &&
@ -834,7 +836,11 @@ static int read_abbrev_decl(const char **ptr, const char *end,
if (name == 0 && form == 0)
break;
if (name == DW_AT_sibling) {
if (name == DW_AT_sibling && tag != DW_TAG_enumeration_type) {
/*
* Not for DW_TAG_enumeration_type because we need to
* descend into any DW_TAG_enumerator children.
*/
switch (form) {
case DW_FORM_ref1:
cmd = ATTRIB_SIBLING_REF1;
@ -1489,6 +1495,7 @@ static int index_cu(DwarfIndex *self, struct compilation_unit *cu)
const char *debug_str_buffer = debug_str->buffer;
const char *debug_str_end = &debug_str_buffer[debug_str->size];
unsigned int depth = 0;
const char *enum_die_ptr = NULL;
int ret = -1;
if (read_abbrev_table(&debug_abbrev->buffer[cu->debug_abbrev_offset],
@ -1508,7 +1515,10 @@ static int index_cu(DwarfIndex *self, struct compilation_unit *cu)
if (ret2 == -1)
goto out;
if (ret2 == 0) {
if (!--depth)
depth--;
if (depth == 1)
enum_die_ptr = NULL;
else if (depth == 0)
break;
continue;
}
@ -1519,10 +1529,21 @@ static int index_cu(DwarfIndex *self, struct compilation_unit *cu)
read_file_name_table(self, cu, die.stmt_list,
&file_name_table) == -1)
goto out;
} else if (depth == 1 && tag &&
!(die.flags & TAG_FLAG_DECLARATION)) {
} else if (tag && !(die.flags & TAG_FLAG_DECLARATION)) {
uint64_t file_name_hash;
/*
* NB: the enumerator name points to the
* enumeration_type DIE instead of the enumerator DIE.
*/
if (depth == 1 && tag == DW_TAG_enumeration_type)
enum_die_ptr = die_ptr;
else if (depth == 2 && tag == DW_TAG_enumerator &&
enum_die_ptr)
die_ptr = enum_die_ptr;
else if (depth != 1)
goto next;
if (die.specification && (!die.name || !die.decl_file)) {
struct die decl = {};
const char *decl_ptr = die.specification;
@ -1555,6 +1576,7 @@ static int index_cu(DwarfIndex *self, struct compilation_unit *cu)
}
}
next:
if (die.flags & TAG_FLAG_CHILDREN) {
if (die.sibling)
ptr = die.sibling;