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![Arnaldo Carvalho de Melo](/assets/img/avatar_default.png)
There is code that needs to see if a resolved address is a function, so, since we're going to ditch the MAP__{FUNCTION,VARIABLE} split, store that info in the per symbol struct. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: David Ahern <dsahern@gmail.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Cc: Wang Nan <wangnan0@huawei.com> Link: https://lkml.kernel.org/n/tip-9ugwxz0i8ryg5702rx8u5q6z@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
703 lines
14 KiB
C
703 lines
14 KiB
C
// SPDX-License-Identifier: GPL-2.0
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#include <inttypes.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <linux/kernel.h>
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#include "util/dso.h"
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#include "util/util.h"
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#include "util/debug.h"
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#include "util/callchain.h"
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#include "srcline.h"
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#include "string2.h"
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#include "symbol.h"
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bool srcline_full_filename;
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static const char *dso__name(struct dso *dso)
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{
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const char *dso_name;
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if (dso->symsrc_filename)
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dso_name = dso->symsrc_filename;
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else
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dso_name = dso->long_name;
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if (dso_name[0] == '[')
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return NULL;
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if (!strncmp(dso_name, "/tmp/perf-", 10))
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return NULL;
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return dso_name;
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}
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static int inline_list__append(struct symbol *symbol, char *srcline,
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struct inline_node *node)
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{
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struct inline_list *ilist;
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ilist = zalloc(sizeof(*ilist));
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if (ilist == NULL)
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return -1;
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ilist->symbol = symbol;
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ilist->srcline = srcline;
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if (callchain_param.order == ORDER_CALLEE)
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list_add_tail(&ilist->list, &node->val);
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else
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list_add(&ilist->list, &node->val);
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return 0;
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}
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/* basename version that takes a const input string */
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static const char *gnu_basename(const char *path)
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{
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const char *base = strrchr(path, '/');
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return base ? base + 1 : path;
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}
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static char *srcline_from_fileline(const char *file, unsigned int line)
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{
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char *srcline;
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if (!file)
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return NULL;
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if (!srcline_full_filename)
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file = gnu_basename(file);
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if (asprintf(&srcline, "%s:%u", file, line) < 0)
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return NULL;
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return srcline;
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}
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static struct symbol *new_inline_sym(struct dso *dso,
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struct symbol *base_sym,
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const char *funcname)
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{
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struct symbol *inline_sym;
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char *demangled = NULL;
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if (dso) {
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demangled = dso__demangle_sym(dso, 0, funcname);
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if (demangled)
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funcname = demangled;
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}
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if (base_sym && strcmp(funcname, base_sym->name) == 0) {
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/* reuse the real, existing symbol */
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inline_sym = base_sym;
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/* ensure that we don't alias an inlined symbol, which could
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* lead to double frees in inline_node__delete
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*/
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assert(!base_sym->inlined);
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} else {
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/* create a fake symbol for the inline frame */
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inline_sym = symbol__new(base_sym ? base_sym->start : 0,
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base_sym ? base_sym->end : 0,
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base_sym ? base_sym->binding : 0,
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base_sym ? base_sym->type : 0,
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funcname);
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if (inline_sym)
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inline_sym->inlined = 1;
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}
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free(demangled);
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return inline_sym;
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}
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#ifdef HAVE_LIBBFD_SUPPORT
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/*
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* Implement addr2line using libbfd.
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*/
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#define PACKAGE "perf"
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#include <bfd.h>
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struct a2l_data {
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const char *input;
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u64 addr;
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bool found;
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const char *filename;
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const char *funcname;
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unsigned line;
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bfd *abfd;
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asymbol **syms;
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};
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static int bfd_error(const char *string)
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{
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const char *errmsg;
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errmsg = bfd_errmsg(bfd_get_error());
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fflush(stdout);
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if (string)
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pr_debug("%s: %s\n", string, errmsg);
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else
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pr_debug("%s\n", errmsg);
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return -1;
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}
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static int slurp_symtab(bfd *abfd, struct a2l_data *a2l)
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{
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long storage;
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long symcount;
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asymbol **syms;
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bfd_boolean dynamic = FALSE;
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if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0)
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return bfd_error(bfd_get_filename(abfd));
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storage = bfd_get_symtab_upper_bound(abfd);
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if (storage == 0L) {
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storage = bfd_get_dynamic_symtab_upper_bound(abfd);
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dynamic = TRUE;
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}
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if (storage < 0L)
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return bfd_error(bfd_get_filename(abfd));
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syms = malloc(storage);
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if (dynamic)
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symcount = bfd_canonicalize_dynamic_symtab(abfd, syms);
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else
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symcount = bfd_canonicalize_symtab(abfd, syms);
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if (symcount < 0) {
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free(syms);
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return bfd_error(bfd_get_filename(abfd));
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}
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a2l->syms = syms;
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return 0;
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}
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static void find_address_in_section(bfd *abfd, asection *section, void *data)
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{
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bfd_vma pc, vma;
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bfd_size_type size;
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struct a2l_data *a2l = data;
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if (a2l->found)
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return;
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if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0)
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return;
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pc = a2l->addr;
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vma = bfd_get_section_vma(abfd, section);
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size = bfd_get_section_size(section);
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if (pc < vma || pc >= vma + size)
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return;
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a2l->found = bfd_find_nearest_line(abfd, section, a2l->syms, pc - vma,
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&a2l->filename, &a2l->funcname,
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&a2l->line);
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if (a2l->filename && !strlen(a2l->filename))
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a2l->filename = NULL;
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}
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static struct a2l_data *addr2line_init(const char *path)
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{
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bfd *abfd;
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struct a2l_data *a2l = NULL;
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abfd = bfd_openr(path, NULL);
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if (abfd == NULL)
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return NULL;
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if (!bfd_check_format(abfd, bfd_object))
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goto out;
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a2l = zalloc(sizeof(*a2l));
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if (a2l == NULL)
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goto out;
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a2l->abfd = abfd;
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a2l->input = strdup(path);
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if (a2l->input == NULL)
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goto out;
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if (slurp_symtab(abfd, a2l))
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goto out;
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return a2l;
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out:
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if (a2l) {
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zfree((char **)&a2l->input);
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free(a2l);
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}
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bfd_close(abfd);
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return NULL;
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}
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static void addr2line_cleanup(struct a2l_data *a2l)
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{
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if (a2l->abfd)
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bfd_close(a2l->abfd);
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zfree((char **)&a2l->input);
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zfree(&a2l->syms);
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free(a2l);
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}
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#define MAX_INLINE_NEST 1024
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static int inline_list__append_dso_a2l(struct dso *dso,
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struct inline_node *node,
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struct symbol *sym)
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{
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struct a2l_data *a2l = dso->a2l;
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struct symbol *inline_sym = new_inline_sym(dso, sym, a2l->funcname);
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char *srcline = NULL;
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if (a2l->filename)
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srcline = srcline_from_fileline(a2l->filename, a2l->line);
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return inline_list__append(inline_sym, srcline, node);
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}
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static int addr2line(const char *dso_name, u64 addr,
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char **file, unsigned int *line, struct dso *dso,
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bool unwind_inlines, struct inline_node *node,
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struct symbol *sym)
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{
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int ret = 0;
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struct a2l_data *a2l = dso->a2l;
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if (!a2l) {
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dso->a2l = addr2line_init(dso_name);
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a2l = dso->a2l;
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}
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if (a2l == NULL) {
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pr_warning("addr2line_init failed for %s\n", dso_name);
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return 0;
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}
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a2l->addr = addr;
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a2l->found = false;
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bfd_map_over_sections(a2l->abfd, find_address_in_section, a2l);
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if (!a2l->found)
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return 0;
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if (unwind_inlines) {
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int cnt = 0;
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if (node && inline_list__append_dso_a2l(dso, node, sym))
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return 0;
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while (bfd_find_inliner_info(a2l->abfd, &a2l->filename,
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&a2l->funcname, &a2l->line) &&
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cnt++ < MAX_INLINE_NEST) {
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if (a2l->filename && !strlen(a2l->filename))
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a2l->filename = NULL;
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if (node != NULL) {
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if (inline_list__append_dso_a2l(dso, node, sym))
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return 0;
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// found at least one inline frame
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ret = 1;
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}
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}
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}
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if (file) {
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*file = a2l->filename ? strdup(a2l->filename) : NULL;
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ret = *file ? 1 : 0;
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}
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if (line)
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*line = a2l->line;
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return ret;
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}
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void dso__free_a2l(struct dso *dso)
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{
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struct a2l_data *a2l = dso->a2l;
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if (!a2l)
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return;
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addr2line_cleanup(a2l);
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dso->a2l = NULL;
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}
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static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
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struct dso *dso, struct symbol *sym)
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{
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struct inline_node *node;
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node = zalloc(sizeof(*node));
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if (node == NULL) {
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perror("not enough memory for the inline node");
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return NULL;
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}
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INIT_LIST_HEAD(&node->val);
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node->addr = addr;
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addr2line(dso_name, addr, NULL, NULL, dso, true, node, sym);
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return node;
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}
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#else /* HAVE_LIBBFD_SUPPORT */
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static int filename_split(char *filename, unsigned int *line_nr)
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{
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char *sep;
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sep = strchr(filename, '\n');
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if (sep)
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*sep = '\0';
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if (!strcmp(filename, "??:0"))
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return 0;
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sep = strchr(filename, ':');
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if (sep) {
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*sep++ = '\0';
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*line_nr = strtoul(sep, NULL, 0);
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return 1;
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}
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return 0;
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}
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static int addr2line(const char *dso_name, u64 addr,
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char **file, unsigned int *line_nr,
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struct dso *dso __maybe_unused,
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bool unwind_inlines __maybe_unused,
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struct inline_node *node __maybe_unused,
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struct symbol *sym __maybe_unused)
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{
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FILE *fp;
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char cmd[PATH_MAX];
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char *filename = NULL;
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size_t len;
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int ret = 0;
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scnprintf(cmd, sizeof(cmd), "addr2line -e %s %016"PRIx64,
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dso_name, addr);
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fp = popen(cmd, "r");
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if (fp == NULL) {
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pr_warning("popen failed for %s\n", dso_name);
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return 0;
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}
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if (getline(&filename, &len, fp) < 0 || !len) {
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pr_warning("addr2line has no output for %s\n", dso_name);
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goto out;
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}
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ret = filename_split(filename, line_nr);
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if (ret != 1) {
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free(filename);
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goto out;
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}
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*file = filename;
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out:
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pclose(fp);
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return ret;
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}
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void dso__free_a2l(struct dso *dso __maybe_unused)
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{
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}
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static struct inline_node *addr2inlines(const char *dso_name, u64 addr,
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struct dso *dso __maybe_unused,
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struct symbol *sym)
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{
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FILE *fp;
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char cmd[PATH_MAX];
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struct inline_node *node;
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char *filename = NULL;
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char *funcname = NULL;
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size_t filelen, funclen;
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unsigned int line_nr = 0;
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scnprintf(cmd, sizeof(cmd), "addr2line -e %s -i -f %016"PRIx64,
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dso_name, addr);
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fp = popen(cmd, "r");
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if (fp == NULL) {
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pr_err("popen failed for %s\n", dso_name);
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return NULL;
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}
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node = zalloc(sizeof(*node));
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if (node == NULL) {
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perror("not enough memory for the inline node");
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goto out;
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}
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INIT_LIST_HEAD(&node->val);
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node->addr = addr;
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/* addr2line -f generates two lines for each inlined functions */
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while (getline(&funcname, &funclen, fp) != -1) {
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char *srcline;
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struct symbol *inline_sym;
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rtrim(funcname);
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if (getline(&filename, &filelen, fp) == -1)
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goto out;
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if (filename_split(filename, &line_nr) != 1)
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goto out;
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srcline = srcline_from_fileline(filename, line_nr);
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inline_sym = new_inline_sym(dso, sym, funcname);
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if (inline_list__append(inline_sym, srcline, node) != 0) {
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free(srcline);
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if (inline_sym && inline_sym->inlined)
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symbol__delete(inline_sym);
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goto out;
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}
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}
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out:
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pclose(fp);
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free(filename);
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free(funcname);
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return node;
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}
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#endif /* HAVE_LIBBFD_SUPPORT */
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/*
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* Number of addr2line failures (without success) before disabling it for that
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* dso.
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*/
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#define A2L_FAIL_LIMIT 123
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char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
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bool show_sym, bool show_addr, bool unwind_inlines,
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u64 ip)
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{
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char *file = NULL;
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unsigned line = 0;
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char *srcline;
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const char *dso_name;
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if (!dso->has_srcline)
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goto out;
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dso_name = dso__name(dso);
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if (dso_name == NULL)
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goto out;
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if (!addr2line(dso_name, addr, &file, &line, dso,
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unwind_inlines, NULL, sym))
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goto out;
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srcline = srcline_from_fileline(file, line);
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free(file);
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if (!srcline)
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goto out;
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dso->a2l_fails = 0;
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return srcline;
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out:
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if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) {
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dso->has_srcline = 0;
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dso__free_a2l(dso);
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}
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if (!show_addr)
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return (show_sym && sym) ?
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strndup(sym->name, sym->namelen) : NULL;
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if (sym) {
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if (asprintf(&srcline, "%s+%" PRIu64, show_sym ? sym->name : "",
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ip - sym->start) < 0)
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return SRCLINE_UNKNOWN;
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} else if (asprintf(&srcline, "%s[%" PRIx64 "]", dso->short_name, addr) < 0)
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return SRCLINE_UNKNOWN;
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return srcline;
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}
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void free_srcline(char *srcline)
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{
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if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0)
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free(srcline);
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}
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char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym,
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bool show_sym, bool show_addr, u64 ip)
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{
|
|
return __get_srcline(dso, addr, sym, show_sym, show_addr, false, ip);
|
|
}
|
|
|
|
struct srcline_node {
|
|
u64 addr;
|
|
char *srcline;
|
|
struct rb_node rb_node;
|
|
};
|
|
|
|
void srcline__tree_insert(struct rb_root *tree, u64 addr, char *srcline)
|
|
{
|
|
struct rb_node **p = &tree->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
struct srcline_node *i, *node;
|
|
|
|
node = zalloc(sizeof(struct srcline_node));
|
|
if (!node) {
|
|
perror("not enough memory for the srcline node");
|
|
return;
|
|
}
|
|
|
|
node->addr = addr;
|
|
node->srcline = srcline;
|
|
|
|
while (*p != NULL) {
|
|
parent = *p;
|
|
i = rb_entry(parent, struct srcline_node, rb_node);
|
|
if (addr < i->addr)
|
|
p = &(*p)->rb_left;
|
|
else
|
|
p = &(*p)->rb_right;
|
|
}
|
|
rb_link_node(&node->rb_node, parent, p);
|
|
rb_insert_color(&node->rb_node, tree);
|
|
}
|
|
|
|
char *srcline__tree_find(struct rb_root *tree, u64 addr)
|
|
{
|
|
struct rb_node *n = tree->rb_node;
|
|
|
|
while (n) {
|
|
struct srcline_node *i = rb_entry(n, struct srcline_node,
|
|
rb_node);
|
|
|
|
if (addr < i->addr)
|
|
n = n->rb_left;
|
|
else if (addr > i->addr)
|
|
n = n->rb_right;
|
|
else
|
|
return i->srcline;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void srcline__tree_delete(struct rb_root *tree)
|
|
{
|
|
struct srcline_node *pos;
|
|
struct rb_node *next = rb_first(tree);
|
|
|
|
while (next) {
|
|
pos = rb_entry(next, struct srcline_node, rb_node);
|
|
next = rb_next(&pos->rb_node);
|
|
rb_erase(&pos->rb_node, tree);
|
|
free_srcline(pos->srcline);
|
|
zfree(&pos);
|
|
}
|
|
}
|
|
|
|
struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr,
|
|
struct symbol *sym)
|
|
{
|
|
const char *dso_name;
|
|
|
|
dso_name = dso__name(dso);
|
|
if (dso_name == NULL)
|
|
return NULL;
|
|
|
|
return addr2inlines(dso_name, addr, dso, sym);
|
|
}
|
|
|
|
void inline_node__delete(struct inline_node *node)
|
|
{
|
|
struct inline_list *ilist, *tmp;
|
|
|
|
list_for_each_entry_safe(ilist, tmp, &node->val, list) {
|
|
list_del_init(&ilist->list);
|
|
free_srcline(ilist->srcline);
|
|
/* only the inlined symbols are owned by the list */
|
|
if (ilist->symbol && ilist->symbol->inlined)
|
|
symbol__delete(ilist->symbol);
|
|
free(ilist);
|
|
}
|
|
|
|
free(node);
|
|
}
|
|
|
|
void inlines__tree_insert(struct rb_root *tree, struct inline_node *inlines)
|
|
{
|
|
struct rb_node **p = &tree->rb_node;
|
|
struct rb_node *parent = NULL;
|
|
const u64 addr = inlines->addr;
|
|
struct inline_node *i;
|
|
|
|
while (*p != NULL) {
|
|
parent = *p;
|
|
i = rb_entry(parent, struct inline_node, rb_node);
|
|
if (addr < i->addr)
|
|
p = &(*p)->rb_left;
|
|
else
|
|
p = &(*p)->rb_right;
|
|
}
|
|
rb_link_node(&inlines->rb_node, parent, p);
|
|
rb_insert_color(&inlines->rb_node, tree);
|
|
}
|
|
|
|
struct inline_node *inlines__tree_find(struct rb_root *tree, u64 addr)
|
|
{
|
|
struct rb_node *n = tree->rb_node;
|
|
|
|
while (n) {
|
|
struct inline_node *i = rb_entry(n, struct inline_node,
|
|
rb_node);
|
|
|
|
if (addr < i->addr)
|
|
n = n->rb_left;
|
|
else if (addr > i->addr)
|
|
n = n->rb_right;
|
|
else
|
|
return i;
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
void inlines__tree_delete(struct rb_root *tree)
|
|
{
|
|
struct inline_node *pos;
|
|
struct rb_node *next = rb_first(tree);
|
|
|
|
while (next) {
|
|
pos = rb_entry(next, struct inline_node, rb_node);
|
|
next = rb_next(&pos->rb_node);
|
|
rb_erase(&pos->rb_node, tree);
|
|
inline_node__delete(pos);
|
|
}
|
|
}
|