perf annotate-arm64: Enable instruction tracking support

Enable basic instruction tracking for arm64 by implementing three
essential functions in the find_data_type_block() call path:

  find_data_type_block
    -> arch_supports_insn_tracking  (1)
    -> find_data_type_insn
         -> init_type_state         (2)
         -> update_var_state
         -> update_insn_state       (3)

Changes:

* arch_supports_insn_tracking(): add arm64 to the list of supported
  architectures, allowing find_data_type_block() to proceed with data
  type analysis.

* init_type_state(): correctly identify ret_reg, stack_reg, and
  caller-saved registers for arm64 during type state initialization.

* update_insn_state(): add the update_insn_state_arm64() callback with
  conservative register invalidation for call instructions and those with
  destination register(s), preventing stale type propagation.

  For now the invalidation path does not treat special instructions
  individually; doing so for every such instruction up front would be
  costly. A TODO is therefore left in invalidate_unhandled_insn_regs()
  marking where per-instruction invalidation handling is to be extended
  in future patches.

With these changes, arm64 gains support for basic variable type
inference during instruction tracking.

Reviewed-by: Ian Rogers <irogers@google.com>
Signed-off-by: Li Huafei <lihuafei1@huawei.com>
Signed-off-by: Tengda Wu <wutengda@huaweicloud.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>

0 files changed, 0 insertions, 0 deletions