root/tools/perf/util/dwarf-aux.h

INCLUDED FROM

   1 /* SPDX-License-Identifier: GPL-2.0-or-later */
   2 #ifndef _DWARF_AUX_H
   3 #define _DWARF_AUX_H
   4 /*
   5  * dwarf-aux.h : libdw auxiliary interfaces
   6  */
   7 
   8 #include <dwarf.h>
   9 #include <elfutils/libdw.h>
  10 #include <elfutils/libdwfl.h>
  11 #include <elfutils/version.h>
  12 
  13 struct strbuf;
  14 
  15 /* Find the realpath of the target file */
  16 const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname);
  17 
  18 /* Get DW_AT_comp_dir (should be NULL with older gcc) */
  19 const char *cu_get_comp_dir(Dwarf_Die *cu_die);
  20 
  21 /* Get a line number and file name for given address */
  22 int cu_find_lineinfo(Dwarf_Die *cudie, unsigned long addr,
  23                      const char **fname, int *lineno);
  24 
  25 /* Walk on funcitons at given address */
  26 int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr,
  27                          int (*callback)(Dwarf_Die *, void *), void *data);
  28 
  29 /* Get DW_AT_linkage_name (should be NULL for C binary) */
  30 const char *die_get_linkage_name(Dwarf_Die *dw_die);
  31 
  32 /* Get the lowest PC in DIE (including range list) */
  33 int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr);
  34 
  35 /* Ensure that this DIE is a subprogram and definition (not declaration) */
  36 bool die_is_func_def(Dwarf_Die *dw_die);
  37 
  38 /* Ensure that this DIE is an instance of a subprogram */
  39 bool die_is_func_instance(Dwarf_Die *dw_die);
  40 
  41 /* Compare diename and tname */
  42 bool die_compare_name(Dwarf_Die *dw_die, const char *tname);
  43 
  44 /* Matching diename with glob pattern */
  45 bool die_match_name(Dwarf_Die *dw_die, const char *glob);
  46 
  47 /* Get callsite line number of inline-function instance */
  48 int die_get_call_lineno(Dwarf_Die *in_die);
  49 
  50 /* Get callsite file name of inlined function instance */
  51 const char *die_get_call_file(Dwarf_Die *in_die);
  52 
  53 /* Get type die */
  54 Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
  55 
  56 /* Get a type die, but skip qualifiers and typedef */
  57 Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
  58 
  59 /* Check whether the DIE is signed or not */
  60 bool die_is_signed_type(Dwarf_Die *tp_die);
  61 
  62 /* Get data_member_location offset */
  63 int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs);
  64 
  65 /* Return values for die_find_child() callbacks */
  66 enum {
  67         DIE_FIND_CB_END = 0,            /* End of Search */
  68         DIE_FIND_CB_CHILD = 1,          /* Search only children */
  69         DIE_FIND_CB_SIBLING = 2,        /* Search only siblings */
  70         DIE_FIND_CB_CONTINUE = 3,       /* Search children and siblings */
  71 };
  72 
  73 /* Search child DIEs */
  74 Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
  75                          int (*callback)(Dwarf_Die *, void *),
  76                          void *data, Dwarf_Die *die_mem);
  77 
  78 /* Search a non-inlined function including given address */
  79 Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
  80                              Dwarf_Die *die_mem);
  81 
  82 /* Search a non-inlined function with tail call at given address */
  83 Dwarf_Die *die_find_tailfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
  84                                     Dwarf_Die *die_mem);
  85 
  86 /* Search the top inlined function including given address */
  87 Dwarf_Die *die_find_top_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
  88                                    Dwarf_Die *die_mem);
  89 
  90 /* Search the deepest inlined function including given address */
  91 Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
  92                                Dwarf_Die *die_mem);
  93 
  94 /* Walk on the instances of given DIE */
  95 int die_walk_instances(Dwarf_Die *in_die,
  96                        int (*callback)(Dwarf_Die *, void *), void *data);
  97 
  98 /* Walker on lines (Note: line number will not be sorted) */
  99 typedef int (* line_walk_callback_t) (const char *fname, int lineno,
 100                                       Dwarf_Addr addr, void *data);
 101 
 102 /*
 103  * Walk on lines inside given DIE. If the DIE is a subprogram, walk only on
 104  * the lines inside the subprogram, otherwise the DIE must be a CU DIE.
 105  */
 106 int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data);
 107 
 108 /* Find a variable called 'name' at given address */
 109 Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
 110                                 Dwarf_Addr addr, Dwarf_Die *die_mem);
 111 
 112 /* Find a member called 'name' */
 113 Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
 114                            Dwarf_Die *die_mem);
 115 
 116 /* Get the name of given variable DIE */
 117 int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf);
 118 
 119 /* Get the name and type of given variable DIE, stored as "type\tname" */
 120 int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf);
 121 int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf);
 122 
 123 /* Check if target program is compiled with optimization */
 124 bool die_is_optimized_target(Dwarf_Die *cu_die);
 125 
 126 /* Use next address after prologue as probe location */
 127 void die_skip_prologue(Dwarf_Die *sp_die, Dwarf_Die *cu_die,
 128                        Dwarf_Addr *entrypc);
 129 
 130 #endif