diff options
Diffstat (limited to 'src/tools/perf/util/dwarf-aux.c')
| -rw-r--r-- | src/tools/perf/util/dwarf-aux.c | 881 |
1 files changed, 0 insertions, 881 deletions
diff --git a/src/tools/perf/util/dwarf-aux.c b/src/tools/perf/util/dwarf-aux.c deleted file mode 100644 index 7defd77..0000000 --- a/src/tools/perf/util/dwarf-aux.c +++ /dev/null @@ -1,881 +0,0 @@ -/* - * dwarf-aux.c : libdw auxiliary interfaces - * - * This program is free software; you can redistribute it and/or modify - * it under the terms of the GNU General Public License as published by - * the Free Software Foundation; either version 2 of the License, or - * (at your option) any later version. - * - * This program is distributed in the hope that it will be useful, - * but WITHOUT ANY WARRANTY; without even the implied warranty of - * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the - * GNU General Public License for more details. - * - * You should have received a copy of the GNU General Public License - * along with this program; if not, write to the Free Software - * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA. - * - */ - -#include <stdbool.h> -#include "util.h" -#include "debug.h" -#include "dwarf-aux.h" - -/** - * cu_find_realpath - Find the realpath of the target file - * @cu_die: A DIE(dwarf information entry) of CU(compilation Unit) - * @fname: The tail filename of the target file - * - * Find the real(long) path of @fname in @cu_die. - */ -const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname) -{ - Dwarf_Files *files; - size_t nfiles, i; - const char *src = NULL; - int ret; - - if (!fname) - return NULL; - - ret = dwarf_getsrcfiles(cu_die, &files, &nfiles); - if (ret != 0) - return NULL; - - for (i = 0; i < nfiles; i++) { - src = dwarf_filesrc(files, i, NULL, NULL); - if (strtailcmp(src, fname) == 0) - break; - } - if (i == nfiles) - return NULL; - return src; -} - -/** - * cu_get_comp_dir - Get the path of compilation directory - * @cu_die: a CU DIE - * - * Get the path of compilation directory of given @cu_die. - * Since this depends on DW_AT_comp_dir, older gcc will not - * embedded it. In that case, this returns NULL. - */ -const char *cu_get_comp_dir(Dwarf_Die *cu_die) -{ - Dwarf_Attribute attr; - if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL) - return NULL; - return dwarf_formstring(&attr); -} - -/** - * cu_find_lineinfo - Get a line number and file name for given address - * @cu_die: a CU DIE - * @addr: An address - * @fname: a pointer which returns the file name string - * @lineno: a pointer which returns the line number - * - * Find a line number and file name for @addr in @cu_die. - */ -int cu_find_lineinfo(Dwarf_Die *cu_die, unsigned long addr, - const char **fname, int *lineno) -{ - Dwarf_Line *line; - Dwarf_Addr laddr; - - line = dwarf_getsrc_die(cu_die, (Dwarf_Addr)addr); - if (line && dwarf_lineaddr(line, &laddr) == 0 && - addr == (unsigned long)laddr && dwarf_lineno(line, lineno) == 0) { - *fname = dwarf_linesrc(line, NULL, NULL); - if (!*fname) - /* line number is useless without filename */ - *lineno = 0; - } - - return *lineno ?: -ENOENT; -} - -static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data); - -/** - * cu_walk_functions_at - Walk on function DIEs at given address - * @cu_die: A CU DIE - * @addr: An address - * @callback: A callback which called with found DIEs - * @data: A user data - * - * Walk on function DIEs at given @addr in @cu_die. Passed DIEs - * should be subprogram or inlined-subroutines. - */ -int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr, - int (*callback)(Dwarf_Die *, void *), void *data) -{ - Dwarf_Die die_mem; - Dwarf_Die *sc_die; - int ret = -ENOENT; - - /* Inlined function could be recursive. Trace it until fail */ - for (sc_die = die_find_realfunc(cu_die, addr, &die_mem); - sc_die != NULL; - sc_die = die_find_child(sc_die, __die_find_inline_cb, &addr, - &die_mem)) { - ret = callback(sc_die, data); - if (ret) - break; - } - - return ret; - -} - -/** - * die_compare_name - Compare diename and tname - * @dw_die: a DIE - * @tname: a string of target name - * - * Compare the name of @dw_die and @tname. Return false if @dw_die has no name. - */ -bool die_compare_name(Dwarf_Die *dw_die, const char *tname) -{ - const char *name; - name = dwarf_diename(dw_die); - return name ? (strcmp(tname, name) == 0) : false; -} - -/** - * die_get_call_lineno - Get callsite line number of inline-function instance - * @in_die: a DIE of an inlined function instance - * - * Get call-site line number of @in_die. This means from where the inline - * function is called. - */ -int die_get_call_lineno(Dwarf_Die *in_die) -{ - Dwarf_Attribute attr; - Dwarf_Word ret; - - if (!dwarf_attr(in_die, DW_AT_call_line, &attr)) - return -ENOENT; - - dwarf_formudata(&attr, &ret); - return (int)ret; -} - -/** - * die_get_type - Get type DIE - * @vr_die: a DIE of a variable - * @die_mem: where to store a type DIE - * - * Get a DIE of the type of given variable (@vr_die), and store - * it to die_mem. Return NULL if fails to get a type DIE. - */ -Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) -{ - Dwarf_Attribute attr; - - if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) && - dwarf_formref_die(&attr, die_mem)) - return die_mem; - else - return NULL; -} - -/* Get a type die, but skip qualifiers */ -static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) -{ - int tag; - - do { - vr_die = die_get_type(vr_die, die_mem); - if (!vr_die) - break; - tag = dwarf_tag(vr_die); - } while (tag == DW_TAG_const_type || - tag == DW_TAG_restrict_type || - tag == DW_TAG_volatile_type || - tag == DW_TAG_shared_type); - - return vr_die; -} - -/** - * die_get_real_type - Get a type die, but skip qualifiers and typedef - * @vr_die: a DIE of a variable - * @die_mem: where to store a type DIE - * - * Get a DIE of the type of given variable (@vr_die), and store - * it to die_mem. Return NULL if fails to get a type DIE. - * If the type is qualifiers (e.g. const) or typedef, this skips it - * and tries to find real type (structure or basic types, e.g. int). - */ -Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem) -{ - do { - vr_die = __die_get_real_type(vr_die, die_mem); - } while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef); - - return vr_die; -} - -/* Get attribute and translate it as a udata */ -static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name, - Dwarf_Word *result) -{ - Dwarf_Attribute attr; - - if (dwarf_attr(tp_die, attr_name, &attr) == NULL || - dwarf_formudata(&attr, result) != 0) - return -ENOENT; - - return 0; -} - -/* Get attribute and translate it as a sdata */ -static int die_get_attr_sdata(Dwarf_Die *tp_die, unsigned int attr_name, - Dwarf_Sword *result) -{ - Dwarf_Attribute attr; - - if (dwarf_attr(tp_die, attr_name, &attr) == NULL || - dwarf_formsdata(&attr, result) != 0) - return -ENOENT; - - return 0; -} - -/** - * die_is_signed_type - Check whether a type DIE is signed or not - * @tp_die: a DIE of a type - * - * Get the encoding of @tp_die and return true if the encoding - * is signed. - */ -bool die_is_signed_type(Dwarf_Die *tp_die) -{ - Dwarf_Word ret; - - if (die_get_attr_udata(tp_die, DW_AT_encoding, &ret)) - return false; - - return (ret == DW_ATE_signed_char || ret == DW_ATE_signed || - ret == DW_ATE_signed_fixed); -} - -/** - * die_is_func_def - Ensure that this DIE is a subprogram and definition - * @dw_die: a DIE - * - * Ensure that this DIE is a subprogram and NOT a declaration. This - * returns true if @dw_die is a function definition. - **/ -bool die_is_func_def(Dwarf_Die *dw_die) -{ - Dwarf_Attribute attr; - - return (dwarf_tag(dw_die) == DW_TAG_subprogram && - dwarf_attr(dw_die, DW_AT_declaration, &attr) == NULL); -} - -/** - * die_get_data_member_location - Get the data-member offset - * @mb_die: a DIE of a member of a data structure - * @offs: The offset of the member in the data structure - * - * Get the offset of @mb_die in the data structure including @mb_die, and - * stores result offset to @offs. If any error occurs this returns errno. - */ -int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs) -{ - Dwarf_Attribute attr; - Dwarf_Op *expr; - size_t nexpr; - int ret; - - if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL) - return -ENOENT; - - if (dwarf_formudata(&attr, offs) != 0) { - /* DW_AT_data_member_location should be DW_OP_plus_uconst */ - ret = dwarf_getlocation(&attr, &expr, &nexpr); - if (ret < 0 || nexpr == 0) - return -ENOENT; - - if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) { - pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n", - expr[0].atom, nexpr); - return -ENOTSUP; - } - *offs = (Dwarf_Word)expr[0].number; - } - return 0; -} - -/* Get the call file index number in CU DIE */ -static int die_get_call_fileno(Dwarf_Die *in_die) -{ - Dwarf_Sword idx; - - if (die_get_attr_sdata(in_die, DW_AT_call_file, &idx) == 0) - return (int)idx; - else - return -ENOENT; -} - -/* Get the declared file index number in CU DIE */ -static int die_get_decl_fileno(Dwarf_Die *pdie) -{ - Dwarf_Sword idx; - - if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0) - return (int)idx; - else - return -ENOENT; -} - -/** - * die_get_call_file - Get callsite file name of inlined function instance - * @in_die: a DIE of an inlined function instance - * - * Get call-site file name of @in_die. This means from which file the inline - * function is called. - */ -const char *die_get_call_file(Dwarf_Die *in_die) -{ - Dwarf_Die cu_die; - Dwarf_Files *files; - int idx; - - idx = die_get_call_fileno(in_die); - if (idx < 0 || !dwarf_diecu(in_die, &cu_die, NULL, NULL) || - dwarf_getsrcfiles(&cu_die, &files, NULL) != 0) - return NULL; - - return dwarf_filesrc(files, idx, NULL, NULL); -} - - -/** - * die_find_child - Generic DIE search function in DIE tree - * @rt_die: a root DIE - * @callback: a callback function - * @data: a user data passed to the callback function - * @die_mem: a buffer for result DIE - * - * Trace DIE tree from @rt_die and call @callback for each child DIE. - * If @callback returns DIE_FIND_CB_END, this stores the DIE into - * @die_mem and returns it. If @callback returns DIE_FIND_CB_CONTINUE, - * this continues to trace the tree. Optionally, @callback can return - * DIE_FIND_CB_CHILD and DIE_FIND_CB_SIBLING, those means trace only - * the children and trace only the siblings respectively. - * Returns NULL if @callback can't find any appropriate DIE. - */ -Dwarf_Die *die_find_child(Dwarf_Die *rt_die, - int (*callback)(Dwarf_Die *, void *), - void *data, Dwarf_Die *die_mem) -{ - Dwarf_Die child_die; - int ret; - - ret = dwarf_child(rt_die, die_mem); - if (ret != 0) - return NULL; - - do { - ret = callback(die_mem, data); - if (ret == DIE_FIND_CB_END) - return die_mem; - - if ((ret & DIE_FIND_CB_CHILD) && - die_find_child(die_mem, callback, data, &child_die)) { - memcpy(die_mem, &child_die, sizeof(Dwarf_Die)); - return die_mem; - } - } while ((ret & DIE_FIND_CB_SIBLING) && - dwarf_siblingof(die_mem, die_mem) == 0); - - return NULL; -} - -struct __addr_die_search_param { - Dwarf_Addr addr; - Dwarf_Die *die_mem; -}; - -/* die_find callback for non-inlined function search */ -static int __die_search_func_cb(Dwarf_Die *fn_die, void *data) -{ - struct __addr_die_search_param *ad = data; - - /* - * Since a declaration entry doesn't has given pc, this always returns - * function definition entry. - */ - if (dwarf_tag(fn_die) == DW_TAG_subprogram && - dwarf_haspc(fn_die, ad->addr)) { - memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); - return DWARF_CB_ABORT; - } - return DWARF_CB_OK; -} - -/** - * die_find_realfunc - Search a non-inlined function at given address - * @cu_die: a CU DIE which including @addr - * @addr: target address - * @die_mem: a buffer for result DIE - * - * Search a non-inlined function DIE which includes @addr. Stores the - * DIE to @die_mem and returns it if found. Returns NULL if failed. - */ -Dwarf_Die *die_find_realfunc(Dwarf_Die *cu_die, Dwarf_Addr addr, - Dwarf_Die *die_mem) -{ - struct __addr_die_search_param ad; - ad.addr = addr; - ad.die_mem = die_mem; - /* dwarf_getscopes can't find subprogram. */ - if (!dwarf_getfuncs(cu_die, __die_search_func_cb, &ad, 0)) - return NULL; - else - return die_mem; -} - -/* die_find callback for inline function search */ -static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data) -{ - Dwarf_Addr *addr = data; - - if (dwarf_tag(die_mem) == DW_TAG_inlined_subroutine && - dwarf_haspc(die_mem, *addr)) - return DIE_FIND_CB_END; - - return DIE_FIND_CB_CONTINUE; -} - -/** - * die_find_top_inlinefunc - Search the top inlined function at given address - * @sp_die: a subprogram DIE which including @addr - * @addr: target address - * @die_mem: a buffer for result DIE - * - * Search an inlined function DIE which includes @addr. Stores the - * DIE to @die_mem and returns it if found. Returns NULL if failed. - * Even if several inlined functions are expanded recursively, this - * doesn't trace it down, and returns the topmost one. - */ -Dwarf_Die *die_find_top_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, - Dwarf_Die *die_mem) -{ - return die_find_child(sp_die, __die_find_inline_cb, &addr, die_mem); -} - -/** - * die_find_inlinefunc - Search an inlined function at given address - * @sp_die: a subprogram DIE which including @addr - * @addr: target address - * @die_mem: a buffer for result DIE - * - * Search an inlined function DIE which includes @addr. Stores the - * DIE to @die_mem and returns it if found. Returns NULL if failed. - * If several inlined functions are expanded recursively, this trace - * it down and returns deepest one. - */ -Dwarf_Die *die_find_inlinefunc(Dwarf_Die *sp_die, Dwarf_Addr addr, - Dwarf_Die *die_mem) -{ - Dwarf_Die tmp_die; - - sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, &tmp_die); - if (!sp_die) - return NULL; - - /* Inlined function could be recursive. Trace it until fail */ - while (sp_die) { - memcpy(die_mem, sp_die, sizeof(Dwarf_Die)); - sp_die = die_find_child(sp_die, __die_find_inline_cb, &addr, - &tmp_die); - } - - return die_mem; -} - -struct __instance_walk_param { - void *addr; - int (*callback)(Dwarf_Die *, void *); - void *data; - int retval; -}; - -static int __die_walk_instances_cb(Dwarf_Die *inst, void *data) -{ - struct __instance_walk_param *iwp = data; - Dwarf_Attribute attr_mem; - Dwarf_Die origin_mem; - Dwarf_Attribute *attr; - Dwarf_Die *origin; - int tmp; - - attr = dwarf_attr(inst, DW_AT_abstract_origin, &attr_mem); - if (attr == NULL) - return DIE_FIND_CB_CONTINUE; - - origin = dwarf_formref_die(attr, &origin_mem); - if (origin == NULL || origin->addr != iwp->addr) - return DIE_FIND_CB_CONTINUE; - - /* Ignore redundant instances */ - if (dwarf_tag(inst) == DW_TAG_inlined_subroutine) { - dwarf_decl_line(origin, &tmp); - if (die_get_call_lineno(inst) == tmp) { - tmp = die_get_decl_fileno(origin); - if (die_get_call_fileno(inst) == tmp) - return DIE_FIND_CB_CONTINUE; - } - } - - iwp->retval = iwp->callback(inst, iwp->data); - - return (iwp->retval) ? DIE_FIND_CB_END : DIE_FIND_CB_CONTINUE; -} - -/** - * die_walk_instances - Walk on instances of given DIE - * @or_die: an abstract original DIE - * @callback: a callback function which is called with instance DIE - * @data: user data - * - * Walk on the instances of give @in_die. @in_die must be an inlined function - * declartion. This returns the return value of @callback if it returns - * non-zero value, or -ENOENT if there is no instance. - */ -int die_walk_instances(Dwarf_Die *or_die, int (*callback)(Dwarf_Die *, void *), - void *data) -{ - Dwarf_Die cu_die; - Dwarf_Die die_mem; - struct __instance_walk_param iwp = { - .addr = or_die->addr, - .callback = callback, - .data = data, - .retval = -ENOENT, - }; - - if (dwarf_diecu(or_die, &cu_die, NULL, NULL) == NULL) - return -ENOENT; - - die_find_child(&cu_die, __die_walk_instances_cb, &iwp, &die_mem); - - return iwp.retval; -} - -/* Line walker internal parameters */ -struct __line_walk_param { - bool recursive; - line_walk_callback_t callback; - void *data; - int retval; -}; - -static int __die_walk_funclines_cb(Dwarf_Die *in_die, void *data) -{ - struct __line_walk_param *lw = data; - Dwarf_Addr addr = 0; - const char *fname; - int lineno; - - if (dwarf_tag(in_die) == DW_TAG_inlined_subroutine) { - fname = die_get_call_file(in_die); - lineno = die_get_call_lineno(in_die); - if (fname && lineno > 0 && dwarf_entrypc(in_die, &addr) == 0) { - lw->retval = lw->callback(fname, lineno, addr, lw->data); - if (lw->retval != 0) - return DIE_FIND_CB_END; - } - } - if (!lw->recursive) - /* Don't need to search recursively */ - return DIE_FIND_CB_SIBLING; - - if (addr) { - fname = dwarf_decl_file(in_die); - if (fname && dwarf_decl_line(in_die, &lineno) == 0) { - lw->retval = lw->callback(fname, lineno, addr, lw->data); - if (lw->retval != 0) - return DIE_FIND_CB_END; - } - } - - /* Continue to search nested inlined function call-sites */ - return DIE_FIND_CB_CONTINUE; -} - -/* Walk on lines of blocks included in given DIE */ -static int __die_walk_funclines(Dwarf_Die *sp_die, bool recursive, - line_walk_callback_t callback, void *data) -{ - struct __line_walk_param lw = { - .recursive = recursive, - .callback = callback, - .data = data, - .retval = 0, - }; - Dwarf_Die die_mem; - Dwarf_Addr addr; - const char *fname; - int lineno; - - /* Handle function declaration line */ - fname = dwarf_decl_file(sp_die); - if (fname && dwarf_decl_line(sp_die, &lineno) == 0 && - dwarf_entrypc(sp_die, &addr) == 0) { - lw.retval = callback(fname, lineno, addr, data); - if (lw.retval != 0) - goto done; - } - die_find_child(sp_die, __die_walk_funclines_cb, &lw, &die_mem); -done: - return lw.retval; -} - -static int __die_walk_culines_cb(Dwarf_Die *sp_die, void *data) -{ - struct __line_walk_param *lw = data; - - lw->retval = __die_walk_funclines(sp_die, true, lw->callback, lw->data); - if (lw->retval != 0) - return DWARF_CB_ABORT; - - return DWARF_CB_OK; -} - -/** - * die_walk_lines - Walk on lines inside given DIE - * @rt_die: a root DIE (CU, subprogram or inlined_subroutine) - * @callback: callback routine - * @data: user data - * - * Walk on all lines inside given @rt_die and call @callback on each line. - * If the @rt_die is a function, walk only on the lines inside the function, - * otherwise @rt_die must be a CU DIE. - * Note that this walks not only dwarf line list, but also function entries - * and inline call-site. - */ -int die_walk_lines(Dwarf_Die *rt_die, line_walk_callback_t callback, void *data) -{ - Dwarf_Lines *lines; - Dwarf_Line *line; - Dwarf_Addr addr; - const char *fname; - int lineno, ret = 0; - Dwarf_Die die_mem, *cu_die; - size_t nlines, i; - - /* Get the CU die */ - if (dwarf_tag(rt_die) != DW_TAG_compile_unit) - cu_die = dwarf_diecu(rt_die, &die_mem, NULL, NULL); - else - cu_die = rt_die; - if (!cu_die) { - pr_debug2("Failed to get CU from given DIE.\n"); - return -EINVAL; - } - - /* Get lines list in the CU */ - if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0) { - pr_debug2("Failed to get source lines on this CU.\n"); - return -ENOENT; - } - pr_debug2("Get %zd lines from this CU\n", nlines); - - /* Walk on the lines on lines list */ - for (i = 0; i < nlines; i++) { - line = dwarf_onesrcline(lines, i); - if (line == NULL || - dwarf_lineno(line, &lineno) != 0 || - dwarf_lineaddr(line, &addr) != 0) { - pr_debug2("Failed to get line info. " - "Possible error in debuginfo.\n"); - continue; - } - /* Filter lines based on address */ - if (rt_die != cu_die) - /* - * Address filtering - * The line is included in given function, and - * no inline block includes it. - */ - if (!dwarf_haspc(rt_die, addr) || - die_find_inlinefunc(rt_die, addr, &die_mem)) - continue; - /* Get source line */ - fname = dwarf_linesrc(line, NULL, NULL); - - ret = callback(fname, lineno, addr, data); - if (ret != 0) - return ret; - } - - /* - * Dwarf lines doesn't include function declarations and inlined - * subroutines. We have to check functions list or given function. - */ - if (rt_die != cu_die) - /* - * Don't need walk functions recursively, because nested - * inlined functions don't have lines of the specified DIE. - */ - ret = __die_walk_funclines(rt_die, false, callback, data); - else { - struct __line_walk_param param = { - .callback = callback, - .data = data, - .retval = 0, - }; - dwarf_getfuncs(cu_die, __die_walk_culines_cb, ¶m, 0); - ret = param.retval; - } - - return ret; -} - -struct __find_variable_param { - const char *name; - Dwarf_Addr addr; -}; - -static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data) -{ - struct __find_variable_param *fvp = data; - int tag; - - tag = dwarf_tag(die_mem); - if ((tag == DW_TAG_formal_parameter || - tag == DW_TAG_variable) && - die_compare_name(die_mem, fvp->name)) - return DIE_FIND_CB_END; - - if (dwarf_haspc(die_mem, fvp->addr)) - return DIE_FIND_CB_CONTINUE; - else - return DIE_FIND_CB_SIBLING; -} - -/** - * die_find_variable_at - Find a given name variable at given address - * @sp_die: a function DIE - * @name: variable name - * @addr: address - * @die_mem: a buffer for result DIE - * - * Find a variable DIE called @name at @addr in @sp_die. - */ -Dwarf_Die *die_find_variable_at(Dwarf_Die *sp_die, const char *name, - Dwarf_Addr addr, Dwarf_Die *die_mem) -{ - struct __find_variable_param fvp = { .name = name, .addr = addr}; - - return die_find_child(sp_die, __die_find_variable_cb, (void *)&fvp, - die_mem); -} - -static int __die_find_member_cb(Dwarf_Die *die_mem, void *data) -{ - const char *name = data; - - if ((dwarf_tag(die_mem) == DW_TAG_member) && - die_compare_name(die_mem, name)) - return DIE_FIND_CB_END; - - return DIE_FIND_CB_SIBLING; -} - -/** - * die_find_member - Find a given name member in a data structure - * @st_die: a data structure type DIE - * @name: member name - * @die_mem: a buffer for result DIE - * - * Find a member DIE called @name in @st_die. - */ -Dwarf_Die *die_find_member(Dwarf_Die *st_die, const char *name, - Dwarf_Die *die_mem) -{ - return die_find_child(st_die, __die_find_member_cb, (void *)name, - die_mem); -} - -/** - * die_get_typename - Get the name of given variable DIE - * @vr_die: a variable DIE - * @buf: a buffer for result type name - * @len: a max-length of @buf - * - * Get the name of @vr_die and stores it to @buf. Return the actual length - * of type name if succeeded. Return -E2BIG if @len is not enough long, and - * Return -ENOENT if failed to find type name. - * Note that the result will stores typedef name if possible, and stores - * "*(function_type)" if the type is a function pointer. - */ -int die_get_typename(Dwarf_Die *vr_die, char *buf, int len) -{ - Dwarf_Die type; - int tag, ret, ret2; - const char *tmp = ""; - - if (__die_get_real_type(vr_die, &type) == NULL) - return -ENOENT; - - tag = dwarf_tag(&type); - if (tag == DW_TAG_array_type || tag == DW_TAG_pointer_type) - tmp = "*"; - else if (tag == DW_TAG_subroutine_type) { - /* Function pointer */ - ret = snprintf(buf, len, "(function_type)"); - return (ret >= len) ? -E2BIG : ret; - } else { - if (!dwarf_diename(&type)) - return -ENOENT; - if (tag == DW_TAG_union_type) - tmp = "union "; - else if (tag == DW_TAG_structure_type) - tmp = "struct "; - else if (tag == DW_TAG_enumeration_type) - tmp = "enum "; - /* Write a base name */ - ret = snprintf(buf, len, "%s%s", tmp, dwarf_diename(&type)); - return (ret >= len) ? -E2BIG : ret; - } - ret = die_get_typename(&type, buf, len); - if (ret > 0) { - ret2 = snprintf(buf + ret, len - ret, "%s", tmp); - ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret; - } - return ret; -} - -/** - * die_get_varname - Get the name and type of given variable DIE - * @vr_die: a variable DIE - * @buf: a buffer for type and variable name - * @len: the max-length of @buf - * - * Get the name and type of @vr_die and stores it in @buf as "type\tname". - */ -int die_get_varname(Dwarf_Die *vr_die, char *buf, int len) -{ - int ret, ret2; - - ret = die_get_typename(vr_die, buf, len); - if (ret < 0) { - pr_debug("Failed to get type, make it unknown.\n"); - ret = snprintf(buf, len, "(unknown_type)"); - } - if (ret > 0) { - ret2 = snprintf(buf + ret, len - ret, "\t%s", - dwarf_diename(vr_die)); - ret = (ret2 >= len - ret) ? -E2BIG : ret2 + ret; - } - return ret; -} - |