cregit-Linux how code gets into the kernel

Release 4.10 tools/perf/util/srcline.c

Directory: tools/perf/util
#include <stdio.h>
#include <stdlib.h>
#include <string.h>

#include <linux/kernel.h>

#include "util/dso.h"
#include "util/util.h"
#include "util/debug.h"

#include "symbol.h"


bool srcline_full_filename;

#ifdef HAVE_LIBBFD_SUPPORT

/*
 * Implement addr2line using libbfd.
 */

#define PACKAGE "perf"
#include <bfd.h>


struct a2l_data {
	
const char 	*input;
	
u64	 	addr;

	
bool 		found;
	
const char 	*filename;
	
const char 	*funcname;
	
unsigned 	line;

	
bfd 		*abfd;
	
asymbol 	**syms;
};


static int bfd_error(const char *string) { const char *errmsg; errmsg = bfd_errmsg(bfd_get_error()); fflush(stdout); if (string) pr_debug("%s: %s\n", string, errmsg); else pr_debug("%s\n", errmsg); return -1; }

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roberto agostino vitilloroberto agostino vitillo54100.00%1100.00%
Total54100.00%1100.00%


static int slurp_symtab(bfd *abfd, struct a2l_data *a2l) { long storage; long symcount; asymbol **syms; bfd_boolean dynamic = FALSE; if ((bfd_get_file_flags(abfd) & HAS_SYMS) == 0) return bfd_error(bfd_get_filename(abfd)); storage = bfd_get_symtab_upper_bound(abfd); if (storage == 0L) { storage = bfd_get_dynamic_symtab_upper_bound(abfd); dynamic = TRUE; } if (storage < 0L) return bfd_error(bfd_get_filename(abfd)); syms = malloc(storage); if (dynamic) symcount = bfd_canonicalize_dynamic_symtab(abfd, syms); else symcount = bfd_canonicalize_symtab(abfd, syms); if (symcount < 0) { free(syms); return bfd_error(bfd_get_filename(abfd)); } a2l->syms = syms; return 0; }

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static void find_address_in_section(bfd *abfd, asection *section, void *data) { bfd_vma pc, vma; bfd_size_type size; struct a2l_data *a2l = data; if (a2l->found) return; if ((bfd_get_section_flags(abfd, section) & SEC_ALLOC) == 0) return; pc = a2l->addr; vma = bfd_get_section_vma(abfd, section); size = bfd_get_section_size(section); if (pc < vma || pc >= vma + size) return; a2l->found = bfd_find_nearest_line(abfd, section, a2l->syms, pc - vma, &a2l->filename, &a2l->funcname, &a2l->line); }

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static struct a2l_data *addr2line_init(const char *path) { bfd *abfd; struct a2l_data *a2l = NULL; abfd = bfd_openr(path, NULL); if (abfd == NULL) return NULL; if (!bfd_check_format(abfd, bfd_object)) goto out; a2l = zalloc(sizeof(*a2l)); if (a2l == NULL) goto out; a2l->abfd = abfd; a2l->input = strdup(path); if (a2l->input == NULL) goto out; if (slurp_symtab(abfd, a2l)) goto out; return a2l; out: if (a2l) { zfree((char **)&a2l->input); free(a2l); } bfd_close(abfd); return NULL; }

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arnaldo carvalho de meloarnaldo carvalho de melo32.00%133.33%
namhyung kimnamhyung kim10.67%133.33%
Total150100.00%3100.00%


static void addr2line_cleanup(struct a2l_data *a2l) { if (a2l->abfd) bfd_close(a2l->abfd); zfree((char **)&a2l->input); zfree(&a2l->syms); free(a2l); }

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roberto agostino vitilloroberto agostino vitillo4488.00%133.33%
arnaldo carvalho de meloarnaldo carvalho de melo510.00%133.33%
namhyung kimnamhyung kim12.00%133.33%
Total50100.00%3100.00%

#define MAX_INLINE_NEST 1024
static int addr2line(const char *dso_name, u64 addr, char **file, unsigned int *line, struct dso *dso, bool unwind_inlines) { int ret = 0; struct a2l_data *a2l = dso->a2l; if (!a2l) { dso->a2l = addr2line_init(dso_name); a2l = dso->a2l; } if (a2l == NULL) { pr_warning("addr2line_init failed for %s\n", dso_name); return 0; } a2l->addr = addr; a2l->found = false; bfd_map_over_sections(a2l->abfd, find_address_in_section, a2l); if (a2l->found && unwind_inlines) { int cnt = 0; while (bfd_find_inliner_info(a2l->abfd, &a2l->filename, &a2l->funcname, &a2l->line) && cnt++ < MAX_INLINE_NEST) ; } if (a2l->found && a2l->filename) { *file = strdup(a2l->filename); *line = a2l->line; if (*file) ret = 1; } return ret; }

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andi kleenandi kleen4824.62%125.00%
adrian hunteradrian hunter3417.44%125.00%
wang nanwang nan10.51%125.00%
Total195100.00%4100.00%


void dso__free_a2l(struct dso *dso) { struct a2l_data *a2l = dso->a2l; if (!a2l) return; addr2line_cleanup(a2l); dso->a2l = NULL; }

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roberto agostino vitilloroberto agostino vitillo616.67%150.00%
Total36100.00%2100.00%

#else /* HAVE_LIBBFD_SUPPORT */
static int addr2line(const char *dso_name, u64 addr, char **file, unsigned int *line_nr, struct dso *dso __maybe_unused, bool unwind_inlines __maybe_unused) { FILE *fp; char cmd[PATH_MAX]; char *filename = NULL; size_t len; char *sep; int ret = 0; scnprintf(cmd, sizeof(cmd), "addr2line -e %s %016"PRIx64, dso_name, addr); fp = popen(cmd, "r"); if (fp == NULL) { pr_warning("popen failed for %s\n", dso_name); return 0; } if (getline(&filename, &len, fp) < 0 || !len) { pr_warning("addr2line has no output for %s\n", dso_name); goto out; } sep = strchr(filename, '\n'); if (sep) *sep = '\0'; if (!strcmp(filename, "??:0")) { pr_debug("no debugging info in %s\n", dso_name); free(filename); goto out; } sep = strchr(filename, ':'); if (sep) { *sep++ = '\0'; *file = filename; *line_nr = strtoul(sep, NULL, 0); ret = 1; } out: pclose(fp); return ret; }

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adrian hunteradrian hunter62.58%125.00%
andi kleenandi kleen41.72%125.00%
wang nanwang nan10.43%125.00%
Total233100.00%4100.00%


void dso__free_a2l(struct dso *dso __maybe_unused) { }

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adrian hunteradrian hunter10100.00%1100.00%
Total10100.00%1100.00%

#endif /* HAVE_LIBBFD_SUPPORT */ /* * Number of addr2line failures (without success) before disabling it for that * dso. */ #define A2L_FAIL_LIMIT 123
char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym, bool show_sym, bool unwind_inlines) { char *file = NULL; unsigned line = 0; char *srcline; const char *dso_name; if (!dso->has_srcline) goto out; if (dso->symsrc_filename) dso_name = dso->symsrc_filename; else dso_name = dso->long_name; if (dso_name[0] == '[') goto out; if (!strncmp(dso_name, "/tmp/perf-", 10)) goto out; if (!addr2line(dso_name, addr, &file, &line, dso, unwind_inlines)) goto out; if (asprintf(&srcline, "%s:%u", srcline_full_filename ? file : basename(file), line) < 0) { free(file); goto out; } dso->a2l_fails = 0; free(file); return srcline; out: if (dso->a2l_fails && ++dso->a2l_fails > A2L_FAIL_LIMIT) { dso->has_srcline = 0; dso__free_a2l(dso); } if (sym) { if (asprintf(&srcline, "%s+%" PRIu64, show_sym ? sym->name : "", addr - sym->start) < 0) return SRCLINE_UNKNOWN; } else if (asprintf(&srcline, "%s[%" PRIx64 "]", dso->short_name, addr) < 0) return SRCLINE_UNKNOWN; return srcline; }

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namhyung kimnamhyung kim11242.75%425.00%
andi kleenandi kleen7930.15%531.25%
adrian hunteradrian hunter6022.90%425.00%
wang nanwang nan62.29%16.25%
david aherndavid ahern41.53%16.25%
arnaldo carvalho de meloarnaldo carvalho de melo10.38%16.25%
Total262100.00%16100.00%


void free_srcline(char *srcline) { if (srcline && strcmp(srcline, SRCLINE_UNKNOWN) != 0) free(srcline); }

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namhyung kimnamhyung kim27100.00%1100.00%
Total27100.00%1100.00%


char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym, bool show_sym) { return __get_srcline(dso, addr, sym, show_sym, false); }

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andi kleenandi kleen36100.00%1100.00%
Total36100.00%1100.00%


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roberto agostino vitilloroberto agostino vitillo69648.88%15.26%
namhyung kimnamhyung kim38426.97%526.32%
andi kleenandi kleen17712.43%526.32%
adrian hunteradrian hunter14510.18%421.05%
arnaldo carvalho de meloarnaldo carvalho de melo90.63%210.53%
wang nanwang nan90.63%15.26%
david aherndavid ahern40.28%15.26%
Total1424100.00%19100.00%
Directory: tools/perf/util
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