Como encontrar dependências dentro de um pacote oracle?

alter session set plscope_settings = 'IDENTIFIERS:ALL';

create or replace package p42 as
  procedure a;
  procedure b;
  procedure c;
  procedure d;
  function f return number;
end p42;
/

create or replace package body p42 as

  procedure a is
  begin
    b;
    c;
  end a;

  procedure b is
    n number;
  begin
    n := f;
  end b;

  procedure c is
    n number;
  begin
    n := f;
  end c;

  procedure d is
  begin
    null;
  end d;

  function f return number is
  begin
    return 42;
  end f;
end p42;
/

WITH v AS (
  SELECT    Line,
            Col,
            INITCAP(NAME) Name,
            LOWER(TYPE)   Type,
            LOWER(USAGE)  Usage,
            USAGE_ID,
            USAGE_CONTEXT_ID
    FROM USER_IDENTIFIERS
      WHERE Object_Name = 'P42'
        AND Object_Type = 'PACKAGE BODY'
)
SELECT RPAD(LPAD(' ', 2*(Level-1)) ||
                 Name, 20, '.')||' '||
                 RPAD(Type, 20)||
                 RPAD(Usage, 20)
                 IDENTIFIER_USAGE_CONTEXTS
  FROM v
  START WITH USAGE_CONTEXT_ID = 0
  CONNECT BY PRIOR USAGE_ID = USAGE_CONTEXT_ID
  ORDER SIBLINGS BY Line, Col
/

IDENTIFIER_USAGE_CONTEXTS                                   
-------------------------------------------------------------
P42................. package             definition          
  A................. procedure           definition          
    B............... procedure           call                
    C............... procedure           call                
  B................. procedure           definition          
    N............... variable            declaration         
      Number........ number datatype     reference           
    N............... variable            assignment          
      F............. function            call                
  C................. procedure           definition          
    N............... variable            declaration         
      Number........ number datatype     reference           
    N............... variable            assignment          
      F............. function            call                
  D................. procedure           definition          
  F................. function            definition          
    Number.......... number datatype     reference           

select *
from (
  select name, type, connect_by_root(name) as root_name,
    connect_by_root(type) as root_type, connect_by_isleaf as isleaf
  from user_identifiers
  start with object_type = 'PACKAGE BODY'
  and object_name = 'P42'
  and type in ('FUNCTION', 'PROCEDURE')
  and usage = 'DEFINITION'
  connect by object_type = prior object_type
  and object_name = prior object_name
  and usage_context_id = prior usage_id
)
where type in ('FUNCTION', 'PROCEDURE');

NAME TYPE               ROOT_NAME ROOT_TYPE     ISLEAF
---- ------------------ --------- --------- ----------
A    PROCEDURE          A         PROCEDURE          0
B    PROCEDURE          A         PROCEDURE          1
C    PROCEDURE          A         PROCEDURE          1
B    PROCEDURE          B         PROCEDURE          0
F    FUNCTION           B         PROCEDURE          1
C    PROCEDURE          C         PROCEDURE          0
F    FUNCTION           C         PROCEDURE          1
D    PROCEDURE          D         PROCEDURE          1
F    FUNCTION           F         FUNCTION           0

select root_name, root_type,
  listagg(case when name = root_name then null else name end, ', ')
    within group (order by name) as callers
from (
  select name, type, connect_by_root(name) as root_name,
    connect_by_root(type) as root_type, connect_by_isleaf as isleaf
  from user_identifiers
  start with object_type = 'PACKAGE BODY'
  and object_name = 'P42'
  and type in ('FUNCTION', 'PROCEDURE')
  and usage = 'DEFINITION'
  connect by object_type = prior object_type
  and object_name = prior object_name
  and usage_context_id = prior usage_id
)
where type in ('FUNCTION', 'PROCEDURE')
and isleaf = 1
group by root_name, root_type;

ROOT_NAME ROOT_TYPE CALLERS            
--------- --------- --------------------
A         PROCEDURE B, C                
B         PROCEDURE F                   
C         PROCEDURE F                   
D         PROCEDURE                     

with ui as (
  select * from user_identifiers
  where object_type = 'PACKAGE BODY'
  and object_name = 'P42'
),
calls as (
  select object_type, object_name, name, type, signature,
    connect_by_root(name) as root_name,
    connect_by_root(type) as root_type,
    connect_by_root(signature) as root_signature,
    connect_by_isleaf as isleaf
  from ui
  start with type in ('FUNCTION', 'PROCEDURE')
  and usage = 'DEFINITION'
  connect by usage_context_id = prior usage_id
  and prior usage != 'CALL'
)
select ui.name, ui.type,
  listagg(case when c.name = c.root_name then null else c.name end, ', ')
    within group (order by c.name) as callers
from ui
left join calls c on c.object_type = ui.object_type
and c.object_name = ui.object_name
and c.root_type = ui.type
and c.root_name = ui.name
and c.root_signature = ui.signature
and c.type in ('FUNCTION', 'PROCEDURE')
and c.isleaf = 1
where ui.type in ('FUNCTION', 'PROCEDURE')
and ui.usage = 'DEFINITION'
group by ui.name, ui.type;

NAME TYPE               CALLERS            
---- ------------------ --------------------
A    PROCEDURE          B, C                
B    PROCEDURE          F                   
C    PROCEDURE          F                   
D    PROCEDURE                              
F    FUNCTION