tools/perf/util/dwarf-aux.h

   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, Dwarf_Addr addr,
  23                      const char **fname, int *lineno);
  24
  25 /* Walk on functions 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 declared file name of a DIE */
  54 const char *die_get_decl_file(Dwarf_Die *dw_die);
  55
  56 /* Get type die */
  57 Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
  58
  59 /* Get a type die, but skip qualifiers */
  60 Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
  61 /* Get a type die, but skip qualifiers and typedef */
  62 Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem);
  63
  64 /* Check whether the DIE is signed or not */
  65 bool die_is_signed_type(Dwarf_Die *tp_die);
  66
  67 /* Get data_member_location offset */
  68 int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs);
  69
  70 /* Return values for die_find_child() callbacks */
  71 enum {
  72         DIE_FIND_CB_END = 0,            /* End of Search */
  73         DIE_FIND_CB_CHILD = 1,          /* Search only children */
  74         DIE_FIND_CB_SIBLING = 2,        /* Search only siblings */
  75         DIE_FIND_CB_CONTINUE = 3,       /* Search children and siblings */
  76 };
  77
  78 /* Search child DIEs */
  79 Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
  80                          int (*callback)(Dwarf_Die *, void *),
  81                          void *data, Dwarf_Die *die_mem);
  82
  83 /* Search a non-inlined function including given address */
  84 Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
  85                              Dwarf_Die *die_mem);
  86
  87 /* Search a non-inlined function with tail call at given address */
  88 Dwarf_Die *die_find_tailfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
  89                                     Dwarf_Die *die_mem);
  90
  91 /* Search the top inlined function including given address */
  92 Dwarf_Die *die_find_top_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
  93                                    Dwarf_Die *die_mem);
  94
  95 /* Search the deepest inlined function including given address */
  96 Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr,
  97                                Dwarf_Die *die_mem);
  98
  99 /* Search a non-inlined function by name and returns its return type */
 100 Dwarf_Die *die_find_func_rettype(Dwarf_Die *sp_die, const char *name,
 101                                  Dwarf_Die *die_mem);
 102
 103 /* Walk on the instances of given DIE */
 104 int die_walk_instances(Dwarf_Die *in_die,
 105                        int (*callback)(Dwarf_Die *, void *), void *data);
 106
 107 /* Walker on lines (Note: line number will not be sorted) */
 108 typedef int (* line_walk_callback_t) (const char *fname, int lineno,
 109                                       Dwarf_Addr addr, void *data);
 110
 111 /*
 112  * Walk on lines inside given DIE. If the DIE is a subprogram, walk only on
 113  * the lines inside the subprogram, otherwise the DIE must be a CU DIE.
 114  */
 115 int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data);
 116
 117 /* Find a variable called 'name' at given address */
 118 Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name,
 119                                 Dwarf_Addr addr, Dwarf_Die *die_mem);
 120
 121 /* Find a member called 'name' */
 122 Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name,
 123                            Dwarf_Die *die_mem);
 124
 125 /* Get the name of given type DIE */
 126 int die_get_typename_from_type(Dwarf_Die *type_die, struct strbuf *buf);
 127
 128 /* Get the name of given variable DIE */
 129 int die_get_typename(Dwarf_Die *vr_die, struct strbuf *buf);
 130
 131 /* Get the name and type of given variable DIE, stored as "type\tname" */
 132 int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf);
 133
 134 /* Check if target program is compiled with optimization */
 135 bool die_is_optimized_target(Dwarf_Die *cu_die);
 136
 137 /* Use next address after prologue as probe location */
 138 void die_skip_prologue(Dwarf_Die *sp_die, Dwarf_Die *cu_die,
 139                        Dwarf_Addr *entrypc);
 140
 141 /* Get the list of including scopes */
 142 int die_get_scopes(Dwarf_Die *cu_die, Dwarf_Addr pc, Dwarf_Die **scopes);
 143
 144 /* Variable type information */
 145 struct die_var_type {
 146         struct die_var_type *next;
 147         u64 die_off;
 148         u64 addr;
 149         int reg;
 150         int offset;
 151 };
 152
 153 /* Return type info of a member at offset */
 154 Dwarf_Die *die_get_member_type(Dwarf_Die *type_die, int offset, Dwarf_Die *die_mem);
 155
 156 /* Return type info where the pointer and offset point to */
 157 Dwarf_Die *die_deref_ptr_type(Dwarf_Die *ptr_die, int offset, Dwarf_Die *die_mem);
 158
 159 /* Get byte offset range of given variable DIE */
 160 int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf);
 161
 162 /* Find a variable saved in the 'reg' at given address */
 163 Dwarf_Die *die_find_variable_by_reg(Dwarf_Die *sc_die, Dwarf_Addr pc, int reg,
 164                                     int *poffset, bool is_fbreg,
 165                                     Dwarf_Die *die_mem);
 166
 167 /* Find a (global) variable located in the 'addr' */
 168 Dwarf_Die *die_find_variable_by_addr(Dwarf_Die *sc_die, Dwarf_Addr addr,
 169                                      Dwarf_Die *die_mem, int *offset);
 170
 171 /* Save all variables and parameters in this scope */
 172 void die_collect_vars(Dwarf_Die *sc_die, struct die_var_type **var_types);
 173
 174 /* Save all global variables in this CU */
 175 void die_collect_global_vars(Dwarf_Die *cu_die, struct die_var_type **var_types);
 176
 177 /* Get the frame base information from CFA */
 178 int die_get_cfa(Dwarf *dwarf, u64 pc, int *preg, int *poffset);
 179
 180 #endif /* _DWARF_AUX_H */