![Masami Hiramatsu](/assets/img/avatar_default.png)
Check the return value of strbuf APIs in perf-probe related code, so that it can handle errors in strbuf. Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Peter Zijlstra <peterz@infradead.org> Link: http://lkml.kernel.org/r/20160510054707.6158.69861.stgit@devbox Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
1088 lines
28 KiB
C
1088 lines
28 KiB
C
/*
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* dwarf-aux.c : libdw auxiliary interfaces
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
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*
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*/
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#include <stdbool.h>
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#include "util.h"
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#include "debug.h"
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#include "dwarf-aux.h"
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/**
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* cu_find_realpath - Find the realpath of the target file
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* @cu_die: A DIE(dwarf information entry) of CU(compilation Unit)
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* @fname: The tail filename of the target file
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*
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* Find the real(long) path of @fname in @cu_die.
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*/
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const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname)
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{
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Dwarf_Files *files;
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size_t nfiles, i;
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const char *src = NULL;
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int ret;
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if (!fname)
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return NULL;
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ret = dwarf_getsrcfiles(cu_die, &files, &nfiles);
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if (ret != 0)
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return NULL;
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for (i = 0; i < nfiles; i++) {
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src = dwarf_filesrc(files, i, NULL, NULL);
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if (strtailcmp(src, fname) == 0)
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break;
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}
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if (i == nfiles)
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return NULL;
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return src;
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}
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/**
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* cu_get_comp_dir - Get the path of compilation directory
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* @cu_die: a CU DIE
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*
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* Get the path of compilation directory of given @cu_die.
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* Since this depends on DW_AT_comp_dir, older gcc will not
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* embedded it. In that case, this returns NULL.
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*/
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const char *cu_get_comp_dir(Dwarf_Die *cu_die)
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{
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Dwarf_Attribute attr;
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if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL)
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return NULL;
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return dwarf_formstring(&attr);
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}
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/**
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* cu_find_lineinfo - Get a line number and file name for given address
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* @cu_die: a CU DIE
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* @addr: An address
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* @fname: a pointer which returns the file name string
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* @lineno: a pointer which returns the line number
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*
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* Find a line number and file name for @addr in @cu_die.
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*/
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int cu_find_lineinfo(Dwarf_Die *cu_die, unsigned long addr,
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const char **fname, int *lineno)
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{
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Dwarf_Line *line;
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Dwarf_Addr laddr;
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line = dwarf_getsrc_die(cu_die, (Dwarf_Addr)addr);
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if (line && dwarf_lineaddr(line, &laddr) == 0 &&
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addr == (unsigned long)laddr && dwarf_lineno(line, lineno) == 0) {
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*fname = dwarf_linesrc(line, NULL, NULL);
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if (!*fname)
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/* line number is useless without filename */
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*lineno = 0;
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}
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return *lineno ?: -ENOENT;
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}
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static int __die_find_inline_cb(Dwarf_Die *die_mem, void *data);
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/**
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* cu_walk_functions_at - Walk on function DIEs at given address
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* @cu_die: A CU DIE
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* @addr: An address
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* @callback: A callback which called with found DIEs
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* @data: A user data
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*
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* Walk on function DIEs at given @addr in @cu_die. Passed DIEs
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* should be subprogram or inlined-subroutines.
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*/
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int cu_walk_functions_at(Dwarf_Die *cu_die, Dwarf_Addr addr,
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int (*callback)(Dwarf_Die *, void *), void *data)
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{
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Dwarf_Die die_mem;
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Dwarf_Die *sc_die;
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int ret = -ENOENT;
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/* Inlined function could be recursive. Trace it until fail */
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for (sc_die = die_find_realfunc(cu_die, addr, &die_mem);
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sc_die != NULL;
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sc_die = die_find_child(sc_die, __die_find_inline_cb, &addr,
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&die_mem)) {
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ret = callback(sc_die, data);
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if (ret)
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break;
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}
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return ret;
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}
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/**
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* die_compare_name - Compare diename and tname
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* @dw_die: a DIE
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* @tname: a string of target name
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*
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* Compare the name of @dw_die and @tname. Return false if @dw_die has no name.
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*/
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bool die_compare_name(Dwarf_Die *dw_die, const char *tname)
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{
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const char *name;
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name = dwarf_diename(dw_die);
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return name ? (strcmp(tname, name) == 0) : false;
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}
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/**
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* die_match_name - Match diename and glob
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* @dw_die: a DIE
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* @glob: a string of target glob pattern
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*
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* Glob matching the name of @dw_die and @glob. Return false if matching fail.
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*/
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bool die_match_name(Dwarf_Die *dw_die, const char *glob)
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{
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const char *name;
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name = dwarf_diename(dw_die);
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return name ? strglobmatch(name, glob) : false;
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}
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/**
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* die_get_call_lineno - Get callsite line number of inline-function instance
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* @in_die: a DIE of an inlined function instance
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*
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* Get call-site line number of @in_die. This means from where the inline
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* function is called.
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*/
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int die_get_call_lineno(Dwarf_Die *in_die)
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{
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Dwarf_Attribute attr;
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Dwarf_Word ret;
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if (!dwarf_attr(in_die, DW_AT_call_line, &attr))
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return -ENOENT;
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dwarf_formudata(&attr, &ret);
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return (int)ret;
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}
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/**
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* die_get_type - Get type DIE
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* @vr_die: a DIE of a variable
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* @die_mem: where to store a type DIE
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*
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* Get a DIE of the type of given variable (@vr_die), and store
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* it to die_mem. Return NULL if fails to get a type DIE.
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*/
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Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
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{
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Dwarf_Attribute attr;
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if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) &&
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dwarf_formref_die(&attr, die_mem))
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return die_mem;
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else
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return NULL;
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}
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/* Get a type die, but skip qualifiers */
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static Dwarf_Die *__die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
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{
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int tag;
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do {
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vr_die = die_get_type(vr_die, die_mem);
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if (!vr_die)
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break;
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tag = dwarf_tag(vr_die);
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} while (tag == DW_TAG_const_type ||
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tag == DW_TAG_restrict_type ||
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tag == DW_TAG_volatile_type ||
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tag == DW_TAG_shared_type);
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return vr_die;
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}
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/**
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* die_get_real_type - Get a type die, but skip qualifiers and typedef
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* @vr_die: a DIE of a variable
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* @die_mem: where to store a type DIE
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*
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* Get a DIE of the type of given variable (@vr_die), and store
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* it to die_mem. Return NULL if fails to get a type DIE.
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* If the type is qualifiers (e.g. const) or typedef, this skips it
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* and tries to find real type (structure or basic types, e.g. int).
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*/
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Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
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{
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do {
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vr_die = __die_get_real_type(vr_die, die_mem);
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} while (vr_die && dwarf_tag(vr_die) == DW_TAG_typedef);
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return vr_die;
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}
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/* Get attribute and translate it as a udata */
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static int die_get_attr_udata(Dwarf_Die *tp_die, unsigned int attr_name,
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Dwarf_Word *result)
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{
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Dwarf_Attribute attr;
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if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
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dwarf_formudata(&attr, result) != 0)
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return -ENOENT;
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return 0;
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}
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/* Get attribute and translate it as a sdata */
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static int die_get_attr_sdata(Dwarf_Die *tp_die, unsigned int attr_name,
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Dwarf_Sword *result)
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{
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Dwarf_Attribute attr;
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if (dwarf_attr(tp_die, attr_name, &attr) == NULL ||
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dwarf_formsdata(&attr, result) != 0)
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return -ENOENT;
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return 0;
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}
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/**
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* die_is_signed_type - Check whether a type DIE is signed or not
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* @tp_die: a DIE of a type
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*
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* Get the encoding of @tp_die and return true if the encoding
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* is signed.
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*/
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bool die_is_signed_type(Dwarf_Die *tp_die)
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{
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Dwarf_Word ret;
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if (die_get_attr_udata(tp_die, DW_AT_encoding, &ret))
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return false;
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return (ret == DW_ATE_signed_char || ret == DW_ATE_signed ||
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ret == DW_ATE_signed_fixed);
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}
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/**
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* die_is_func_def - Ensure that this DIE is a subprogram and definition
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* @dw_die: a DIE
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*
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* Ensure that this DIE is a subprogram and NOT a declaration. This
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* returns true if @dw_die is a function definition.
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**/
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bool die_is_func_def(Dwarf_Die *dw_die)
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{
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Dwarf_Attribute attr;
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return (dwarf_tag(dw_die) == DW_TAG_subprogram &&
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dwarf_attr(dw_die, DW_AT_declaration, &attr) == NULL);
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}
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/**
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* die_is_func_instance - Ensure that this DIE is an instance of a subprogram
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* @dw_die: a DIE
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*
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* Ensure that this DIE is an instance (which has an entry address).
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* This returns true if @dw_die is a function instance. If not, you need to
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* call die_walk_instances() to find actual instances.
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**/
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bool die_is_func_instance(Dwarf_Die *dw_die)
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{
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Dwarf_Addr tmp;
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/* Actually gcc optimizes non-inline as like as inlined */
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return !dwarf_func_inline(dw_die) && dwarf_entrypc(dw_die, &tmp) == 0;
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}
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/**
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* die_get_data_member_location - Get the data-member offset
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* @mb_die: a DIE of a member of a data structure
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* @offs: The offset of the member in the data structure
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*
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* Get the offset of @mb_die in the data structure including @mb_die, and
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* stores result offset to @offs. If any error occurs this returns errno.
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*/
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int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs)
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{
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Dwarf_Attribute attr;
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Dwarf_Op *expr;
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size_t nexpr;
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int ret;
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if (dwarf_attr(mb_die, DW_AT_data_member_location, &attr) == NULL)
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return -ENOENT;
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if (dwarf_formudata(&attr, offs) != 0) {
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/* DW_AT_data_member_location should be DW_OP_plus_uconst */
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ret = dwarf_getlocation(&attr, &expr, &nexpr);
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if (ret < 0 || nexpr == 0)
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return -ENOENT;
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if (expr[0].atom != DW_OP_plus_uconst || nexpr != 1) {
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pr_debug("Unable to get offset:Unexpected OP %x (%zd)\n",
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expr[0].atom, nexpr);
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return -ENOTSUP;
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}
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*offs = (Dwarf_Word)expr[0].number;
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}
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return 0;
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}
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/* Get the call file index number in CU DIE */
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static int die_get_call_fileno(Dwarf_Die *in_die)
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{
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Dwarf_Sword idx;
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if (die_get_attr_sdata(in_die, DW_AT_call_file, &idx) == 0)
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return (int)idx;
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else
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return -ENOENT;
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}
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/* Get the declared file index number in CU DIE */
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static int die_get_decl_fileno(Dwarf_Die *pdie)
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{
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Dwarf_Sword idx;
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if (die_get_attr_sdata(pdie, DW_AT_decl_file, &idx) == 0)
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return (int)idx;
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else
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return -ENOENT;
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}
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/**
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* die_get_call_file - Get callsite file name of inlined function instance
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* @in_die: a DIE of an inlined function instance
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*
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* Get call-site file name of @in_die. This means from which file the inline
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* function is called.
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*/
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const char *die_get_call_file(Dwarf_Die *in_die)
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{
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Dwarf_Die cu_die;
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Dwarf_Files *files;
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int idx;
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idx = die_get_call_fileno(in_die);
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if (idx < 0 || !dwarf_diecu(in_die, &cu_die, NULL, NULL) ||
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dwarf_getsrcfiles(&cu_die, &files, NULL) != 0)
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return NULL;
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return dwarf_filesrc(files, idx, NULL, NULL);
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}
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/**
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* die_find_child - Generic DIE search function in DIE tree
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* @rt_die: a root DIE
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* @callback: a callback function
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* @data: a user data passed to the callback function
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* @die_mem: a buffer for result DIE
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*
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* Trace DIE tree from @rt_die and call @callback for each child DIE.
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* If @callback returns DIE_FIND_CB_END, this stores the DIE into
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* @die_mem and returns it. If @callback returns DIE_FIND_CB_CONTINUE,
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* this continues to trace the tree. Optionally, @callback can return
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* DIE_FIND_CB_CHILD and DIE_FIND_CB_SIBLING, those means trace only
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* the children and trace only the siblings respectively.
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* Returns NULL if @callback can't find any appropriate DIE.
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*/
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Dwarf_Die *die_find_child(Dwarf_Die *rt_die,
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int (*callback)(Dwarf_Die *, void *),
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void *data, Dwarf_Die *die_mem)
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{
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Dwarf_Die child_die;
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int ret;
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ret = dwarf_child(rt_die, die_mem);
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if (ret != 0)
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return NULL;
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do {
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ret = callback(die_mem, data);
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if (ret == DIE_FIND_CB_END)
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return die_mem;
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|
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if ((ret & DIE_FIND_CB_CHILD) &&
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die_find_child(die_mem, callback, data, &child_die)) {
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memcpy(die_mem, &child_die, sizeof(Dwarf_Die));
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return die_mem;
|
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}
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} while ((ret & DIE_FIND_CB_SIBLING) &&
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dwarf_siblingof(die_mem, die_mem) == 0);
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return NULL;
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}
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struct __addr_die_search_param {
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Dwarf_Addr addr;
|
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Dwarf_Die *die_mem;
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};
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|
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static int __die_search_func_tail_cb(Dwarf_Die *fn_die, void *data)
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{
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struct __addr_die_search_param *ad = data;
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Dwarf_Addr addr = 0;
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|
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if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
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!dwarf_highpc(fn_die, &addr) &&
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addr == ad->addr) {
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memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
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return DWARF_CB_ABORT;
|
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}
|
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return DWARF_CB_OK;
|
|
}
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|
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/**
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* die_find_tailfunc - Search for a non-inlined function with tail call at
|
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* given address
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* @cu_die: a CU DIE which including @addr
|
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* @addr: target address
|
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* @die_mem: a buffer for result DIE
|
|
*
|
|
* Search for a non-inlined function DIE with tail call at @addr. Stores the
|
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* DIE to @die_mem and returns it if found. Returns NULL if failed.
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|
*/
|
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Dwarf_Die *die_find_tailfunc(Dwarf_Die *cu_die, Dwarf_Addr addr,
|
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Dwarf_Die *die_mem)
|
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{
|
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struct __addr_die_search_param ad;
|
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ad.addr = addr;
|
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ad.die_mem = die_mem;
|
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/* dwarf_getscopes can't find subprogram. */
|
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if (!dwarf_getfuncs(cu_die, __die_search_func_tail_cb, &ad, 0))
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return NULL;
|
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else
|
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return die_mem;
|
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}
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|
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/* die_find callback for non-inlined function search */
|
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static int __die_search_func_cb(Dwarf_Die *fn_die, void *data)
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{
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struct __addr_die_search_param *ad = data;
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|
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/*
|
|
* Since a declaration entry doesn't has given pc, this always returns
|
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* function definition entry.
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|
*/
|
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if (dwarf_tag(fn_die) == DW_TAG_subprogram &&
|
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dwarf_haspc(fn_die, ad->addr)) {
|
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memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die));
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return DWARF_CB_ABORT;
|
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}
|
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return DWARF_CB_OK;
|
|
}
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|
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/**
|
|
* die_find_realfunc - Search a non-inlined function at given address
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* @cu_die: a CU DIE which including @addr
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* @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, *decf = NULL;
|
|
int lineno, ret = 0;
|
|
int decl = 0, inl;
|
|
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);
|
|
dwarf_decl_line(rt_die, &decl);
|
|
decf = dwarf_decl_file(rt_die);
|
|
} 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))
|
|
continue;
|
|
if (die_find_inlinefunc(rt_die, addr, &die_mem)) {
|
|
dwarf_decl_line(&die_mem, &inl);
|
|
if (inl != decl ||
|
|
decf != dwarf_decl_file(&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;
|
|
Dwarf_Attribute attr;
|
|
int tag;
|
|
|
|
tag = dwarf_tag(die_mem);
|
|
if ((tag == DW_TAG_formal_parameter ||
|
|
tag == DW_TAG_variable) &&
|
|
die_compare_name(die_mem, fvp->name) &&
|
|
/* Does the DIE have location information or external instance? */
|
|
(dwarf_attr(die_mem, DW_AT_external, &attr) ||
|
|
dwarf_attr(die_mem, DW_AT_location, &attr)))
|
|
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) {
|
|
if (die_compare_name(die_mem, name))
|
|
return DIE_FIND_CB_END;
|
|
else if (!dwarf_diename(die_mem)) { /* Unnamed structure */
|
|
Dwarf_Die type_die, tmp_die;
|
|
if (die_get_type(die_mem, &type_die) &&
|
|
die_find_member(&type_die, name, &tmp_die))
|
|
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 strbuf for result type name
|
|
*
|
|
* Get the name of @vr_die and stores it to @buf. Return 0 if succeeded.
|
|
* 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, struct strbuf *buf)
|
|
{
|
|
Dwarf_Die type;
|
|
int tag, ret;
|
|
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 */
|
|
return strbuf_add(buf, "(function_type)", 15);
|
|
} 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 */
|
|
return strbuf_addf(buf, "%s%s", tmp, dwarf_diename(&type));
|
|
}
|
|
ret = die_get_typename(&type, buf);
|
|
return ret ? ret : strbuf_addstr(buf, tmp);
|
|
}
|
|
|
|
/**
|
|
* die_get_varname - Get the name and type of given variable DIE
|
|
* @vr_die: a variable DIE
|
|
* @buf: a strbuf for type and variable name
|
|
*
|
|
* Get the name and type of @vr_die and stores it in @buf as "type\tname".
|
|
*/
|
|
int die_get_varname(Dwarf_Die *vr_die, struct strbuf *buf)
|
|
{
|
|
int ret;
|
|
|
|
ret = die_get_typename(vr_die, buf);
|
|
if (ret < 0) {
|
|
pr_debug("Failed to get type, make it unknown.\n");
|
|
ret = strbuf_add(buf, " (unknown_type)", 14);
|
|
}
|
|
|
|
return ret < 0 ? ret : strbuf_addf(buf, "\t%s", dwarf_diename(vr_die));
|
|
}
|
|
|
|
#ifdef HAVE_DWARF_GETLOCATIONS
|
|
/**
|
|
* die_get_var_innermost_scope - Get innermost scope range of given variable DIE
|
|
* @sp_die: a subprogram DIE
|
|
* @vr_die: a variable DIE
|
|
* @buf: a strbuf for variable byte offset range
|
|
*
|
|
* Get the innermost scope range of @vr_die and stores it in @buf as
|
|
* "@<function_name+[NN-NN,NN-NN]>".
|
|
*/
|
|
static int die_get_var_innermost_scope(Dwarf_Die *sp_die, Dwarf_Die *vr_die,
|
|
struct strbuf *buf)
|
|
{
|
|
Dwarf_Die *scopes;
|
|
int count;
|
|
size_t offset = 0;
|
|
Dwarf_Addr base;
|
|
Dwarf_Addr start, end;
|
|
Dwarf_Addr entry;
|
|
int ret;
|
|
bool first = true;
|
|
const char *name;
|
|
|
|
ret = dwarf_entrypc(sp_die, &entry);
|
|
if (ret)
|
|
return ret;
|
|
|
|
name = dwarf_diename(sp_die);
|
|
if (!name)
|
|
return -ENOENT;
|
|
|
|
count = dwarf_getscopes_die(vr_die, &scopes);
|
|
|
|
/* (*SCOPES)[1] is the DIE for the scope containing that scope */
|
|
if (count <= 1) {
|
|
ret = -EINVAL;
|
|
goto out;
|
|
}
|
|
|
|
while ((offset = dwarf_ranges(&scopes[1], offset, &base,
|
|
&start, &end)) > 0) {
|
|
start -= entry;
|
|
end -= entry;
|
|
|
|
if (first) {
|
|
ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
|
|
name, start, end);
|
|
first = false;
|
|
} else {
|
|
ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
|
|
start, end);
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
if (!first)
|
|
ret = strbuf_add(buf, "]>", 2);
|
|
|
|
out:
|
|
free(scopes);
|
|
return ret;
|
|
}
|
|
|
|
/**
|
|
* die_get_var_range - Get byte offset range of given variable DIE
|
|
* @sp_die: a subprogram DIE
|
|
* @vr_die: a variable DIE
|
|
* @buf: a strbuf for type and variable name and byte offset range
|
|
*
|
|
* Get the byte offset range of @vr_die and stores it in @buf as
|
|
* "@<function_name+[NN-NN,NN-NN]>".
|
|
*/
|
|
int die_get_var_range(Dwarf_Die *sp_die, Dwarf_Die *vr_die, struct strbuf *buf)
|
|
{
|
|
int ret = 0;
|
|
Dwarf_Addr base;
|
|
Dwarf_Addr start, end;
|
|
Dwarf_Addr entry;
|
|
Dwarf_Op *op;
|
|
size_t nops;
|
|
size_t offset = 0;
|
|
Dwarf_Attribute attr;
|
|
bool first = true;
|
|
const char *name;
|
|
|
|
ret = dwarf_entrypc(sp_die, &entry);
|
|
if (ret)
|
|
return ret;
|
|
|
|
name = dwarf_diename(sp_die);
|
|
if (!name)
|
|
return -ENOENT;
|
|
|
|
if (dwarf_attr(vr_die, DW_AT_location, &attr) == NULL)
|
|
return -EINVAL;
|
|
|
|
while ((offset = dwarf_getlocations(&attr, offset, &base,
|
|
&start, &end, &op, &nops)) > 0) {
|
|
if (start == 0) {
|
|
/* Single Location Descriptions */
|
|
ret = die_get_var_innermost_scope(sp_die, vr_die, buf);
|
|
goto out;
|
|
}
|
|
|
|
/* Location Lists */
|
|
start -= entry;
|
|
end -= entry;
|
|
if (first) {
|
|
ret = strbuf_addf(buf, "@<%s+[%" PRIu64 "-%" PRIu64,
|
|
name, start, end);
|
|
first = false;
|
|
} else {
|
|
ret = strbuf_addf(buf, ",%" PRIu64 "-%" PRIu64,
|
|
start, end);
|
|
}
|
|
if (ret < 0)
|
|
goto out;
|
|
}
|
|
|
|
if (!first)
|
|
ret = strbuf_add(buf, "]>", 2);
|
|
out:
|
|
return ret;
|
|
}
|
|
#else
|
|
int die_get_var_range(Dwarf_Die *sp_die __maybe_unused,
|
|
Dwarf_Die *vr_die __maybe_unused,
|
|
struct strbuf *buf __maybe_unused)
|
|
{
|
|
return -ENOTSUP;
|
|
}
|
|
#endif
|