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1414 lines
36 KiB
1414 lines
36 KiB
// SPDX-License-Identifier: GPL-2.0-or-later |
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/* |
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* dwarf-aux.c : libdw auxiliary interfaces |
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*/ |
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|
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#include <errno.h> |
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#include <inttypes.h> |
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#include <stdbool.h> |
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#include <stdlib.h> |
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#include "debug.h" |
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#include "dwarf-aux.h" |
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#include "strbuf.h" |
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#include "string2.h" |
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|
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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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|
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if (!fname) |
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return NULL; |
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|
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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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|
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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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/** |
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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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/* Unlike dwarf_getsrc_die(), cu_getsrc_die() only returns statement line */ |
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static Dwarf_Line *cu_getsrc_die(Dwarf_Die *cu_die, Dwarf_Addr addr) |
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{ |
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Dwarf_Addr laddr; |
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Dwarf_Lines *lines; |
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Dwarf_Line *line; |
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size_t nlines, l, u, n; |
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bool flag; |
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|
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if (dwarf_getsrclines(cu_die, &lines, &nlines) != 0 || |
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nlines == 0) |
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return NULL; |
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|
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/* Lines are sorted by address, use binary search */ |
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l = 0; u = nlines - 1; |
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while (l < u) { |
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n = u - (u - l) / 2; |
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line = dwarf_onesrcline(lines, n); |
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if (!line || dwarf_lineaddr(line, &laddr) != 0) |
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return NULL; |
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if (addr < laddr) |
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u = n - 1; |
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else |
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l = n; |
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} |
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/* Going backward to find the lowest line */ |
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do { |
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line = dwarf_onesrcline(lines, --l); |
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if (!line || dwarf_lineaddr(line, &laddr) != 0) |
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return NULL; |
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} while (laddr == addr); |
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l++; |
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/* Going forward to find the statement line */ |
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do { |
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line = dwarf_onesrcline(lines, l++); |
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if (!line || dwarf_lineaddr(line, &laddr) != 0 || |
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dwarf_linebeginstatement(line, &flag) != 0) |
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return NULL; |
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if (laddr > addr) |
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return NULL; |
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} while (!flag); |
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return line; |
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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, Dwarf_Addr 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_Die die_mem; |
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Dwarf_Addr faddr; |
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|
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if (die_find_realfunc(cu_die, addr, &die_mem) |
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&& die_entrypc(&die_mem, &faddr) == 0 && |
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faddr == addr) { |
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*fname = dwarf_decl_file(&die_mem); |
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dwarf_decl_line(&die_mem, lineno); |
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goto out; |
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} |
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line = cu_getsrc_die(cu_die, addr); |
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if (line && 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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|
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out: |
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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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/** |
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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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|
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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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/** |
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* die_get_linkage_name - Get the linkage name of the object |
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* @dw_die: A DIE of the object |
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* |
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* Get the linkage name attribute of given @dw_die. |
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* For C++ binary, the linkage name will be the mangled symbol. |
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*/ |
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const char *die_get_linkage_name(Dwarf_Die *dw_die) |
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{ |
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Dwarf_Attribute attr; |
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|
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if (dwarf_attr_integrate(dw_die, DW_AT_linkage_name, &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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/** |
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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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|
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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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/** |
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* die_match_name - Match diename/linkage name 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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* This also match linkage name. |
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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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|
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name = dwarf_diename(dw_die); |
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if (name && strglobmatch(name, glob)) |
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return true; |
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/* fall back to check linkage name */ |
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name = die_get_linkage_name(dw_die); |
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if (name && strglobmatch(name, glob)) |
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return true; |
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|
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return 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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|
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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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|
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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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|
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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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/** |
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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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|
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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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|
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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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/** |
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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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Dwarf_Addr addr = 0; |
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|
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if (dwarf_tag(dw_die) != DW_TAG_subprogram) |
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return false; |
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|
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if (dwarf_attr(dw_die, DW_AT_declaration, &attr)) |
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return false; |
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|
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/* |
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* DW_AT_declaration can be lost from function declaration |
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* by gcc's bug #97060. |
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* So we need to check this subprogram DIE has DW_AT_inline |
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* or an entry address. |
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*/ |
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if (!dwarf_attr(dw_die, DW_AT_inline, &attr) && |
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die_entrypc(dw_die, &addr) < 0) |
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return false; |
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|
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return true; |
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} |
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|
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/** |
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* die_entrypc - Returns entry PC (the lowest address) of a DIE |
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* @dw_die: a DIE |
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* @addr: where to store entry PC |
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* |
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* Since dwarf_entrypc() does not return entry PC if the DIE has only address |
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* range, we have to use this to retrieve the lowest address from the address |
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* range attribute. |
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*/ |
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int die_entrypc(Dwarf_Die *dw_die, Dwarf_Addr *addr) |
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{ |
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Dwarf_Addr base, end; |
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Dwarf_Attribute attr; |
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|
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if (!addr) |
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return -EINVAL; |
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|
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if (dwarf_entrypc(dw_die, addr) == 0) |
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return 0; |
|
|
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/* |
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* Since the dwarf_ranges() will return 0 if there is no |
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* DW_AT_ranges attribute, we should check it first. |
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*/ |
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if (!dwarf_attr(dw_die, DW_AT_ranges, &attr)) |
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return -ENOENT; |
|
|
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return dwarf_ranges(dw_die, 0, &base, addr, &end) < 0 ? -ENOENT : 0; |
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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, the @dw_die |
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* must be a prototype. You can use die_walk_instances() to find actual |
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* 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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Dwarf_Attribute attr_mem; |
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int tag = dwarf_tag(dw_die); |
|
|
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if (tag != DW_TAG_subprogram && |
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tag != DW_TAG_inlined_subroutine) |
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return false; |
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|
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return dwarf_entrypc(dw_die, &tmp) == 0 || |
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dwarf_attr(dw_die, DW_AT_ranges, &attr_mem) != NULL; |
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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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int die_get_data_member_location(Dwarf_Die *mb_die, Dwarf_Word *offs) |
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{ |
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Dwarf_Attribute attr; |
|
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) { |
|
/* 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; |
|
} |
|
|
|
/* 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; |
|
|
|
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; |
|
}; |
|
|
|
static int __die_search_func_tail_cb(Dwarf_Die *fn_die, void *data) |
|
{ |
|
struct __addr_die_search_param *ad = data; |
|
Dwarf_Addr addr = 0; |
|
|
|
if (dwarf_tag(fn_die) == DW_TAG_subprogram && |
|
!dwarf_highpc(fn_die, &addr) && |
|
addr == ad->addr) { |
|
memcpy(ad->die_mem, fn_die, sizeof(Dwarf_Die)); |
|
return DWARF_CB_ABORT; |
|
} |
|
return DWARF_CB_OK; |
|
} |
|
|
|
/** |
|
* die_find_tailfunc - Search for a non-inlined function with tail call at |
|
* given address |
|
* @cu_die: a CU DIE which including @addr |
|
* @addr: target address |
|
* @die_mem: a buffer for result DIE |
|
* |
|
* Search for a non-inlined function DIE with tail call at @addr. Stores the |
|
* DIE to @die_mem and returns it if found. Returns NULL if failed. |
|
*/ |
|
Dwarf_Die *die_find_tailfunc(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_tail_cb, &ad, 0)) |
|
return NULL; |
|
else |
|
return 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; |
|
|
|
if (!die_is_func_instance(inst)) |
|
return DIE_FIND_CB_CONTINUE; |
|
|
|
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 |
|
* declaration. 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 && die_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) |
|
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 && |
|
die_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; |
|
|
|
/* |
|
* Since inlined function can include another inlined function in |
|
* the same file, we need to walk in it recursively. |
|
*/ |
|
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, *inf = NULL; |
|
int lineno, ret = 0; |
|
int decl = 0, inl; |
|
Dwarf_Die die_mem, *cu_die; |
|
size_t nlines, i; |
|
bool flag; |
|
|
|
/* 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; |
|
} |
|
/* Skip end-of-sequence */ |
|
if (dwarf_lineendsequence(line, &flag) != 0 || flag) |
|
continue; |
|
/* Skip Non statement line-info */ |
|
if (dwarf_linebeginstatement(line, &flag) != 0 || !flag) |
|
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)) { |
|
/* Call-site check */ |
|
inf = die_get_call_file(&die_mem); |
|
if ((inf && !strcmp(inf, decf)) && |
|
die_get_call_lineno(&die_mem) == lineno) |
|
goto found; |
|
|
|
dwarf_decl_line(&die_mem, &inl); |
|
if (inl != decl || |
|
decf != dwarf_decl_file(&die_mem)) |
|
continue; |
|
} |
|
} |
|
found: |
|
/* 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 inlined functions recursively, because |
|
* inner inlined functions don't have the lines of the |
|
* specified function. |
|
*/ |
|
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 const value |
|
* or external instance? |
|
*/ |
|
(dwarf_attr(die_mem, DW_AT_external, &attr) || |
|
dwarf_attr(die_mem, DW_AT_location, &attr) || |
|
dwarf_attr(die_mem, DW_AT_const_value, &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_SUPPORT |
|
/** |
|
* 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 = die_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 = die_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 |
|
|
|
/* |
|
* die_has_loclist - Check if DW_AT_location of @vr_die is a location list |
|
* @vr_die: a variable DIE |
|
*/ |
|
static bool die_has_loclist(Dwarf_Die *vr_die) |
|
{ |
|
Dwarf_Attribute loc; |
|
int tag = dwarf_tag(vr_die); |
|
|
|
if (tag != DW_TAG_formal_parameter && |
|
tag != DW_TAG_variable) |
|
return false; |
|
|
|
return (dwarf_attr_integrate(vr_die, DW_AT_location, &loc) && |
|
dwarf_whatform(&loc) == DW_FORM_sec_offset); |
|
} |
|
|
|
/* |
|
* die_is_optimized_target - Check if target program is compiled with |
|
* optimization |
|
* @cu_die: a CU DIE |
|
* |
|
* For any object in given CU whose DW_AT_location is a location list, |
|
* target program is compiled with optimization. This is applicable to |
|
* clang as well. |
|
*/ |
|
bool die_is_optimized_target(Dwarf_Die *cu_die) |
|
{ |
|
Dwarf_Die tmp_die; |
|
|
|
if (die_has_loclist(cu_die)) |
|
return true; |
|
|
|
if (!dwarf_child(cu_die, &tmp_die) && |
|
die_is_optimized_target(&tmp_die)) |
|
return true; |
|
|
|
if (!dwarf_siblingof(cu_die, &tmp_die) && |
|
die_is_optimized_target(&tmp_die)) |
|
return true; |
|
|
|
return false; |
|
} |
|
|
|
/* |
|
* die_search_idx - Search index of given line address |
|
* @lines: Line records of single CU |
|
* @nr_lines: Number of @lines |
|
* @addr: address we are looking for |
|
* @idx: index to be set by this function (return value) |
|
* |
|
* Search for @addr by looping over every lines of CU. If address |
|
* matches, set index of that line in @idx. Note that single source |
|
* line can have multiple line records. i.e. single source line can |
|
* have multiple index. |
|
*/ |
|
static bool die_search_idx(Dwarf_Lines *lines, unsigned long nr_lines, |
|
Dwarf_Addr addr, unsigned long *idx) |
|
{ |
|
unsigned long i; |
|
Dwarf_Addr tmp; |
|
|
|
for (i = 0; i < nr_lines; i++) { |
|
if (dwarf_lineaddr(dwarf_onesrcline(lines, i), &tmp)) |
|
return false; |
|
|
|
if (tmp == addr) { |
|
*idx = i; |
|
return true; |
|
} |
|
} |
|
return false; |
|
} |
|
|
|
/* |
|
* die_get_postprologue_addr - Search next address after function prologue |
|
* @entrypc_idx: entrypc index |
|
* @lines: Line records of single CU |
|
* @nr_lines: Number of @lines |
|
* @hignpc: high PC address of function |
|
* @postprologue_addr: Next address after function prologue (return value) |
|
* |
|
* Look for prologue-end marker. If there is no explicit marker, return |
|
* address of next line record or next source line. |
|
*/ |
|
static bool die_get_postprologue_addr(unsigned long entrypc_idx, |
|
Dwarf_Lines *lines, |
|
unsigned long nr_lines, |
|
Dwarf_Addr highpc, |
|
Dwarf_Addr *postprologue_addr) |
|
{ |
|
unsigned long i; |
|
int entrypc_lno, lno; |
|
Dwarf_Line *line; |
|
Dwarf_Addr addr; |
|
bool p_end; |
|
|
|
/* entrypc_lno is actual source line number */ |
|
line = dwarf_onesrcline(lines, entrypc_idx); |
|
if (dwarf_lineno(line, &entrypc_lno)) |
|
return false; |
|
|
|
for (i = entrypc_idx; i < nr_lines; i++) { |
|
line = dwarf_onesrcline(lines, i); |
|
|
|
if (dwarf_lineaddr(line, &addr) || |
|
dwarf_lineno(line, &lno) || |
|
dwarf_lineprologueend(line, &p_end)) |
|
return false; |
|
|
|
/* highpc is exclusive. [entrypc,highpc) */ |
|
if (addr >= highpc) |
|
break; |
|
|
|
/* clang supports prologue-end marker */ |
|
if (p_end) |
|
break; |
|
|
|
/* Actual next line in source */ |
|
if (lno != entrypc_lno) |
|
break; |
|
|
|
/* |
|
* Single source line can have multiple line records. |
|
* For Example, |
|
* void foo() { printf("hello\n"); } |
|
* contains two line records. One points to declaration and |
|
* other points to printf() line. Variable 'lno' won't get |
|
* incremented in this case but 'i' will. |
|
*/ |
|
if (i != entrypc_idx) |
|
break; |
|
} |
|
|
|
dwarf_lineaddr(line, postprologue_addr); |
|
if (*postprologue_addr >= highpc) |
|
dwarf_lineaddr(dwarf_onesrcline(lines, i - 1), |
|
postprologue_addr); |
|
|
|
return true; |
|
} |
|
|
|
/* |
|
* die_skip_prologue - Use next address after prologue as probe location |
|
* @sp_die: a subprogram DIE |
|
* @cu_die: a CU DIE |
|
* @entrypc: entrypc of the function |
|
* |
|
* Function prologue prepares stack and registers before executing function |
|
* logic. When target program is compiled without optimization, function |
|
* parameter information is only valid after prologue. When we probe entrypc |
|
* of the function, and try to record function parameter, it contains |
|
* garbage value. |
|
*/ |
|
void die_skip_prologue(Dwarf_Die *sp_die, Dwarf_Die *cu_die, |
|
Dwarf_Addr *entrypc) |
|
{ |
|
size_t nr_lines = 0; |
|
unsigned long entrypc_idx = 0; |
|
Dwarf_Lines *lines = NULL; |
|
Dwarf_Addr postprologue_addr; |
|
Dwarf_Addr highpc; |
|
|
|
if (dwarf_highpc(sp_die, &highpc)) |
|
return; |
|
|
|
if (dwarf_getsrclines(cu_die, &lines, &nr_lines)) |
|
return; |
|
|
|
if (!die_search_idx(lines, nr_lines, *entrypc, &entrypc_idx)) |
|
return; |
|
|
|
if (!die_get_postprologue_addr(entrypc_idx, lines, nr_lines, |
|
highpc, &postprologue_addr)) |
|
return; |
|
|
|
*entrypc = postprologue_addr; |
|
}
|
|
|