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perf annotate-arm64: Track return type after call instructions

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Enable data type profiling to track function return values in arm64
annotations by looking up the DWARF return type of called functions.

Reviewed-by: Ian Rogers <irogers@google.com>
Reviewed-by: Namhyung Kim <namhyung@kernel.org>
Signed-off-by: Tengda Wu <wutengda@huaweicloud.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Tengda Wu 2026-10-20 13:45:00 +00:00 committed by Arnaldo Carvalho de Melo
parent 68cedb761d
commit 7c132a86ec
1 changed files with 18 additions and 3 deletions
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21
tools/perf/util/annotate-arch/annotate-arm64.c
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@ -463,12 +463,14 @@ static bool is_readonly_insn(const char *name)
}
static void update_call_insn_state(struct type_state *state,
struct data_loc_info *dloc,
struct data_loc_info *dloc, Dwarf_Die *cu_die,
struct disasm_line *dl)
{
struct symbol *func = dl->ops.target.sym;
const char *call_name;
u64 call_addr;
struct type_state_reg *tsr;
Dwarf_Die type_die;
u32 insn_offset = dl->al.offset;
call_name = func ? func->name : dl->ops.target.name;
@ -487,6 +489,19 @@ static void update_call_insn_state(struct type_state *state,
continue;
invalidate_reg_state(reg);
}
/* Update register with the return type (if any) */
if (call_name && die_find_func_rettype(cu_die, call_name, &type_die)) {
tsr = &state->regs[state->ret_reg];
invalidate_reg_state(tsr);
tsr->type = type_die;
tsr->kind = TSR_KIND_TYPE;
tsr->offset = 0;
tsr->ok = true;
pr_debug_dtp("call [%x] return -> reg%d", insn_offset, state->ret_reg);
pr_debug_type_name(&type_die, tsr->kind);
}
}
/* Invalidate registers explicitly written by an unhandled instruction. */
@ -513,7 +528,7 @@ static void invalidate_unhandled_insn_regs(struct type_state *state,
}
static void update_insn_state_arm64(struct type_state *state,
struct data_loc_info *dloc, Dwarf_Die *cu_die __maybe_unused,
struct data_loc_info *dloc, Dwarf_Die *cu_die,
struct disasm_line *dl)
{
struct annotated_insn_loc loc;
@ -526,7 +541,7 @@ static void update_insn_state_arm64(struct type_state *state,
return;
if (ins__is_call(&dl->ins))
update_call_insn_state(state, dloc, dl);
update_call_insn_state(state, dloc, cu_die, dl);
else
invalidate_unhandled_insn_regs(state, dl, dst);
}