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perf dwarf-aux: Add die_collect_global_vars()

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This function is to search all global variables in the CU.  We want to
have the list of global variables at once and match them later.

Signed-off-by: Namhyung Kim <namhyung@kernel.org>
Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Ian Rogers <irogers@google.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Jiri Olsa <jolsa@kernel.org>
Cc: Kan Liang <kan.liang@linux.intel.com>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20240502060011.1838090-2-namhyung@kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Namhyung Kim 2024-05-01 23:00:06 -07:00 committed by Arnaldo Carvalho de Melo
parent 8c618b58c8
commit d7b60803a7
2 changed files with 70 additions and 0 deletions
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62
tools/perf/util/dwarf-aux.c
View File

@ -1630,6 +1630,68 @@ void die_collect_vars(Dwarf_Die *sc_die, struct die_var_type **var_types)
die_find_child(sc_die, __die_collect_vars_cb, (void *)var_types, &die_mem);
}
static int __die_collect_global_vars_cb(Dwarf_Die *die_mem, void *arg)
{
struct die_var_type **var_types = arg;
Dwarf_Die type_die;
int tag = dwarf_tag(die_mem);
Dwarf_Attribute attr;
Dwarf_Addr base, start, end;
Dwarf_Op *ops;
size_t nops;
struct die_var_type *vt;
if (tag != DW_TAG_variable)
return DIE_FIND_CB_SIBLING;
if (dwarf_attr(die_mem, DW_AT_location, &attr) == NULL)
return DIE_FIND_CB_SIBLING;
/* Only collect the location with an absolute address. */
if (dwarf_getlocations(&attr, 0, &base, &start, &end, &ops, &nops) <= 0)
return DIE_FIND_CB_SIBLING;
if (ops->atom != DW_OP_addr)
return DIE_FIND_CB_SIBLING;
if (!check_allowed_ops(ops, nops))
return DIE_FIND_CB_SIBLING;
if (die_get_real_type(die_mem, &type_die) == NULL)
return DIE_FIND_CB_SIBLING;
vt = malloc(sizeof(*vt));
if (vt == NULL)
return DIE_FIND_CB_END;
vt->die_off = dwarf_dieoffset(&type_die);
vt->addr = ops->number;
vt->reg = -1;
vt->offset = 0;
vt->next = *var_types;
*var_types = vt;
return DIE_FIND_CB_SIBLING;
}
/**
* die_collect_global_vars - Save all global variables
* @cu_die: a CU DIE
* @var_types: a pointer to save the resulting list
*
* Save all global variables in the @cu_die and save them to @var_types.
* The @var_types is a singly-linked list containing type and location info.
* Actual type can be retrieved using dwarf_offdie() with 'die_off' later.
*
* Callers should free @var_types.
*/
void die_collect_global_vars(Dwarf_Die *cu_die, struct die_var_type **var_types)
{
Dwarf_Die die_mem;
die_find_child(cu_die, __die_collect_global_vars_cb, (void *)var_types, &die_mem);
}
#endif /* HAVE_DWARF_GETLOCATIONS_SUPPORT */
#ifdef HAVE_DWARF_CFI_SUPPORT

8
tools/perf/util/dwarf-aux.h
View File

@ -171,6 +171,9 @@ Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr addr,
/* Save all variables and parameters in this scope */
void die_collect_vars(Dwarf_Die *sc_die, struct die_var_type **var_types);
/* Save all global variables in this CU */
void die_collect_global_vars(Dwarf_Die *cu_die, struct die_var_type **var_types);
#else /* HAVE_DWARF_GETLOCATIONS_SUPPORT */
static inline int die_get_var_range(Dwarf_Die *sp_die __maybe_unused,
@ -203,6 +206,11 @@ static inline void die_collect_vars(Dwarf_Die *sc_die __maybe_unused,
{
}
static inline void die_collect_global_vars(Dwarf_Die *cu_die __maybe_unused,
struct die_var_type **var_types __maybe_unused)
{
}
#endif /* HAVE_DWARF_GETLOCATIONS_SUPPORT */
#ifdef HAVE_DWARF_CFI_SUPPORT