* [PATCH 2/3] perf probe: Support comp_dir to find an absolute source path [not found] <20100709081743.7173.62191.stgit@ltc236.sdl.hitachi.co.jp> @ 2010-07-09 9:29 ` Masami Hiramatsu 2010-07-17 11:11 ` [tip:perf/core] " tip-bot for Masami Hiramatsu 2010-07-09 9:29 ` [PATCH 3/3] perf probe: Fix the logic of die_compare_name Masami Hiramatsu 1 sibling, 1 reply; 4+ messages in thread From: Masami Hiramatsu @ 2010-07-09 9:29 UTC (permalink / raw) To: linux-kernel; +Cc: Masami Hiramatsu, Arnaldo Carvalho de Melo, Ingo Molnar Gcc generates DW_AT_comp_dir and stores relative source path if building kernel without O= option. In that case, perf probe --line sometimes doesn't work without --source option, because it tries to access relative source path. This adds DW_AT_comp_dir support to perf probe for finding an absolute source path when no --source option. Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> --- tools/perf/util/probe-event.c | 34 ++++++++++++++++++++++------------ tools/perf/util/probe-event.h | 1 + tools/perf/util/probe-finder.c | 21 +++++++++++++++++++++ 3 files changed, 44 insertions(+), 12 deletions(-) diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 8d08e75..4445a1e 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -201,28 +201,38 @@ static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev, * a newly allocated path on success. * Return 0 if file was found and readable, -errno otherwise. */ -static int get_real_path(const char *raw_path, char **new_path) +static int get_real_path(const char *raw_path, const char *comp_dir, + char **new_path) { - if (!symbol_conf.source_prefix) { - if (access(raw_path, R_OK) == 0) { - *new_path = strdup(raw_path); - return 0; - } else - return -errno; + const char *prefix = symbol_conf.source_prefix; + + if (!prefix) { + if (raw_path[0] != '/' && comp_dir) + /* If not an absolute path, try to use comp_dir */ + prefix = comp_dir; + else { + if (access(raw_path, R_OK) == 0) { + *new_path = strdup(raw_path); + return 0; + } else + return -errno; + } } - *new_path = malloc((strlen(symbol_conf.source_prefix) + - strlen(raw_path) + 2)); + *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); if (!*new_path) return -ENOMEM; for (;;) { - sprintf(*new_path, "%s/%s", symbol_conf.source_prefix, - raw_path); + sprintf(*new_path, "%s/%s", prefix, raw_path); if (access(*new_path, R_OK) == 0) return 0; + if (!symbol_conf.source_prefix) + /* In case of searching comp_dir, don't retry */ + return -errno; + switch (errno) { case ENAMETOOLONG: case ENOENT: @@ -318,7 +328,7 @@ int show_line_range(struct line_range *lr) /* Convert source file path */ tmp = lr->path; - ret = get_real_path(tmp, &lr->path); + ret = get_real_path(tmp, lr->comp_dir, &lr->path); free(tmp); /* Free old path */ if (ret < 0) { pr_warning("Failed to find source file. (%d)\n", ret); diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h index bc06d3e..ed362ac 100644 --- a/tools/perf/util/probe-event.h +++ b/tools/perf/util/probe-event.h @@ -86,6 +86,7 @@ struct line_range { int end; /* End line number */ int offset; /* Start line offset */ char *path; /* Real path name */ + char *comp_dir; /* Compile directory */ struct list_head line_list; /* Visible lines */ }; diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index a934a36..37dcdb6 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -144,6 +144,15 @@ static const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname) return src; } +/* Get DW_AT_comp_dir (should be NULL with older gcc) */ +static const char *cu_get_comp_dir(Dwarf_Die *cu_die) +{ + Dwarf_Attribute attr; + if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL) + return NULL; + return dwarf_formstring(&attr); +} + /* Compare diename and tname */ static bool die_compare_name(Dwarf_Die *dw_die, const char *tname) { @@ -1374,6 +1383,7 @@ int find_line_range(int fd, struct line_range *lr) size_t cuhl; Dwarf_Die *diep; Dwarf *dbg; + const char *comp_dir; dbg = dwarf_begin(fd, DWARF_C_READ); if (!dbg) { @@ -1409,6 +1419,17 @@ int find_line_range(int fd, struct line_range *lr) } off = noff; } + + /* Store comp_dir */ + if (lf.found) { + comp_dir = cu_get_comp_dir(&lf.cu_die); + if (comp_dir) { + lr->comp_dir = strdup(comp_dir); + if (!lr->comp_dir) + ret = -ENOMEM; + } + } + pr_debug("path: %s\n", lr->path); dwarf_end(dbg); ^ permalink raw reply [flat|nested] 4+ messages in thread
* [tip:perf/core] perf probe: Support comp_dir to find an absolute source path 2010-07-09 9:29 ` [PATCH 2/3] perf probe: Support comp_dir to find an absolute source path Masami Hiramatsu @ 2010-07-17 11:11 ` tip-bot for Masami Hiramatsu 0 siblings, 0 replies; 4+ messages in thread From: tip-bot for Masami Hiramatsu @ 2010-07-17 11:11 UTC (permalink / raw) To: linux-tip-commits Cc: acme, linux-kernel, hpa, mingo, masami.hiramatsu.pt, tglx, mingo Commit-ID: 6a330a3c8a648916b3c6bda79a78c38ac093af17 Gitweb: http://git.kernel.org/tip/6a330a3c8a648916b3c6bda79a78c38ac093af17 Author: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> AuthorDate: Fri, 9 Jul 2010 18:29:11 +0900 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Fri, 16 Jul 2010 11:48:09 -0300 perf probe: Support comp_dir to find an absolute source path Gcc generates DW_AT_comp_dir and stores relative source path if building kernel without O= option. In that case, perf probe --line sometimes doesn't work without --source option, because it tries to access relative source path. This adds DW_AT_comp_dir support to perf probe for finding an absolute source path when no --source option. LKML-Reference: <4C36EBE7.3060802@hitachi.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/probe-event.c | 34 ++++++++++++++++++++++------------ tools/perf/util/probe-event.h | 1 + tools/perf/util/probe-finder.c | 21 +++++++++++++++++++++ 3 files changed, 44 insertions(+), 12 deletions(-) diff --git a/tools/perf/util/probe-event.c b/tools/perf/util/probe-event.c index 8d08e75..4445a1e 100644 --- a/tools/perf/util/probe-event.c +++ b/tools/perf/util/probe-event.c @@ -201,28 +201,38 @@ static int try_to_find_kprobe_trace_events(struct perf_probe_event *pev, * a newly allocated path on success. * Return 0 if file was found and readable, -errno otherwise. */ -static int get_real_path(const char *raw_path, char **new_path) +static int get_real_path(const char *raw_path, const char *comp_dir, + char **new_path) { - if (!symbol_conf.source_prefix) { - if (access(raw_path, R_OK) == 0) { - *new_path = strdup(raw_path); - return 0; - } else - return -errno; + const char *prefix = symbol_conf.source_prefix; + + if (!prefix) { + if (raw_path[0] != '/' && comp_dir) + /* If not an absolute path, try to use comp_dir */ + prefix = comp_dir; + else { + if (access(raw_path, R_OK) == 0) { + *new_path = strdup(raw_path); + return 0; + } else + return -errno; + } } - *new_path = malloc((strlen(symbol_conf.source_prefix) + - strlen(raw_path) + 2)); + *new_path = malloc((strlen(prefix) + strlen(raw_path) + 2)); if (!*new_path) return -ENOMEM; for (;;) { - sprintf(*new_path, "%s/%s", symbol_conf.source_prefix, - raw_path); + sprintf(*new_path, "%s/%s", prefix, raw_path); if (access(*new_path, R_OK) == 0) return 0; + if (!symbol_conf.source_prefix) + /* In case of searching comp_dir, don't retry */ + return -errno; + switch (errno) { case ENAMETOOLONG: case ENOENT: @@ -318,7 +328,7 @@ int show_line_range(struct line_range *lr) /* Convert source file path */ tmp = lr->path; - ret = get_real_path(tmp, &lr->path); + ret = get_real_path(tmp, lr->comp_dir, &lr->path); free(tmp); /* Free old path */ if (ret < 0) { pr_warning("Failed to find source file. (%d)\n", ret); diff --git a/tools/perf/util/probe-event.h b/tools/perf/util/probe-event.h index bc06d3e..ed362ac 100644 --- a/tools/perf/util/probe-event.h +++ b/tools/perf/util/probe-event.h @@ -86,6 +86,7 @@ struct line_range { int end; /* End line number */ int offset; /* Start line offset */ char *path; /* Real path name */ + char *comp_dir; /* Compile directory */ struct list_head line_list; /* Visible lines */ }; diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index a934a36..37dcdb6 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -144,6 +144,15 @@ static const char *cu_find_realpath(Dwarf_Die *cu_die, const char *fname) return src; } +/* Get DW_AT_comp_dir (should be NULL with older gcc) */ +static const char *cu_get_comp_dir(Dwarf_Die *cu_die) +{ + Dwarf_Attribute attr; + if (dwarf_attr(cu_die, DW_AT_comp_dir, &attr) == NULL) + return NULL; + return dwarf_formstring(&attr); +} + /* Compare diename and tname */ static bool die_compare_name(Dwarf_Die *dw_die, const char *tname) { @@ -1374,6 +1383,7 @@ int find_line_range(int fd, struct line_range *lr) size_t cuhl; Dwarf_Die *diep; Dwarf *dbg; + const char *comp_dir; dbg = dwarf_begin(fd, DWARF_C_READ); if (!dbg) { @@ -1409,6 +1419,17 @@ int find_line_range(int fd, struct line_range *lr) } off = noff; } + + /* Store comp_dir */ + if (lf.found) { + comp_dir = cu_get_comp_dir(&lf.cu_die); + if (comp_dir) { + lr->comp_dir = strdup(comp_dir); + if (!lr->comp_dir) + ret = -ENOMEM; + } + } + pr_debug("path: %s\n", lr->path); dwarf_end(dbg); ^ permalink raw reply [flat|nested] 4+ messages in thread
* [PATCH 3/3] perf probe: Fix the logic of die_compare_name [not found] <20100709081743.7173.62191.stgit@ltc236.sdl.hitachi.co.jp> 2010-07-09 9:29 ` [PATCH 2/3] perf probe: Support comp_dir to find an absolute source path Masami Hiramatsu @ 2010-07-09 9:29 ` Masami Hiramatsu 2010-07-17 11:11 ` [tip:perf/core] " tip-bot for Masami Hiramatsu 1 sibling, 1 reply; 4+ messages in thread From: Masami Hiramatsu @ 2010-07-09 9:29 UTC (permalink / raw) To: linux-kernel; +Cc: Masami Hiramatsu, Arnaldo Carvalho de Melo, Ingo Molnar Invert the return value of die_compare_name(), because it returns a 'bool' result which should be expeced true if the die's name is same as compared string. Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> --- tools/perf/util/probe-finder.c | 14 +++++++------- 1 files changed, 7 insertions(+), 7 deletions(-) diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index 37dcdb6..f88070e 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -158,7 +158,7 @@ static bool die_compare_name(Dwarf_Die *dw_die, const char *tname) { const char *name; name = dwarf_diename(dw_die); - return name ? strcmp(tname, name) : -1; + return name ? (strcmp(tname, name) == 0) : false; } /* Get type die, but skip qualifiers and typedef */ @@ -329,7 +329,7 @@ static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data) tag = dwarf_tag(die_mem); if ((tag == DW_TAG_formal_parameter || tag == DW_TAG_variable) && - (die_compare_name(die_mem, name) == 0)) + die_compare_name(die_mem, name)) return DIE_FIND_CB_FOUND; return DIE_FIND_CB_CONTINUE; @@ -348,7 +348,7 @@ static int __die_find_member_cb(Dwarf_Die *die_mem, void *data) const char *name = data; if ((dwarf_tag(die_mem) == DW_TAG_member) && - (die_compare_name(die_mem, name) == 0)) + die_compare_name(die_mem, name)) return DIE_FIND_CB_FOUND; return DIE_FIND_CB_SIBLING; @@ -506,8 +506,8 @@ static int convert_variable_type(Dwarf_Die *vr_die, return -ENOMEM; } } - if (die_compare_name(&type, "char") != 0 && - die_compare_name(&type, "unsigned char") != 0) { + if (!die_compare_name(&type, "char") && + !die_compare_name(&type, "unsigned char")) { pr_warning("Failed to cast into string: " "%s is not (unsigned) char *.", dwarf_diename(vr_die)); @@ -1017,7 +1017,7 @@ static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) /* Check tag and diename */ if (dwarf_tag(sp_die) != DW_TAG_subprogram || - die_compare_name(sp_die, pp->function) != 0) + !die_compare_name(sp_die, pp->function)) return DWARF_CB_OK; pf->fname = dwarf_decl_file(sp_die); @@ -1340,7 +1340,7 @@ static int line_range_search_cb(Dwarf_Die *sp_die, void *data) struct line_range *lr = lf->lr; if (dwarf_tag(sp_die) == DW_TAG_subprogram && - die_compare_name(sp_die, lr->function) == 0) { + die_compare_name(sp_die, lr->function)) { lf->fname = dwarf_decl_file(sp_die); dwarf_decl_line(sp_die, &lr->offset); pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); ^ permalink raw reply [flat|nested] 4+ messages in thread
* [tip:perf/core] perf probe: Fix the logic of die_compare_name 2010-07-09 9:29 ` [PATCH 3/3] perf probe: Fix the logic of die_compare_name Masami Hiramatsu @ 2010-07-17 11:11 ` tip-bot for Masami Hiramatsu 0 siblings, 0 replies; 4+ messages in thread From: tip-bot for Masami Hiramatsu @ 2010-07-17 11:11 UTC (permalink / raw) To: linux-tip-commits Cc: acme, linux-kernel, hpa, mingo, masami.hiramatsu.pt, tglx, mingo Commit-ID: 8217563359878d11ef03cc76bc935ada89d73efd Gitweb: http://git.kernel.org/tip/8217563359878d11ef03cc76bc935ada89d73efd Author: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> AuthorDate: Fri, 9 Jul 2010 18:29:17 +0900 Committer: Arnaldo Carvalho de Melo <acme@redhat.com> CommitDate: Fri, 16 Jul 2010 11:48:34 -0300 perf probe: Fix the logic of die_compare_name Invert the return value of die_compare_name(), because it returns a 'bool' result which should be expeced true if the die's name is same as compared string. LKML-Reference: <4C36EBED.1000006@hitachi.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Ingo Molnar <mingo@elte.hu> Signed-off-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com> Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com> --- tools/perf/util/probe-finder.c | 14 +++++++------- 1 files changed, 7 insertions(+), 7 deletions(-) diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c index 37dcdb6..f88070e 100644 --- a/tools/perf/util/probe-finder.c +++ b/tools/perf/util/probe-finder.c @@ -158,7 +158,7 @@ static bool die_compare_name(Dwarf_Die *dw_die, const char *tname) { const char *name; name = dwarf_diename(dw_die); - return name ? strcmp(tname, name) : -1; + return name ? (strcmp(tname, name) == 0) : false; } /* Get type die, but skip qualifiers and typedef */ @@ -329,7 +329,7 @@ static int __die_find_variable_cb(Dwarf_Die *die_mem, void *data) tag = dwarf_tag(die_mem); if ((tag == DW_TAG_formal_parameter || tag == DW_TAG_variable) && - (die_compare_name(die_mem, name) == 0)) + die_compare_name(die_mem, name)) return DIE_FIND_CB_FOUND; return DIE_FIND_CB_CONTINUE; @@ -348,7 +348,7 @@ static int __die_find_member_cb(Dwarf_Die *die_mem, void *data) const char *name = data; if ((dwarf_tag(die_mem) == DW_TAG_member) && - (die_compare_name(die_mem, name) == 0)) + die_compare_name(die_mem, name)) return DIE_FIND_CB_FOUND; return DIE_FIND_CB_SIBLING; @@ -506,8 +506,8 @@ static int convert_variable_type(Dwarf_Die *vr_die, return -ENOMEM; } } - if (die_compare_name(&type, "char") != 0 && - die_compare_name(&type, "unsigned char") != 0) { + if (!die_compare_name(&type, "char") && + !die_compare_name(&type, "unsigned char")) { pr_warning("Failed to cast into string: " "%s is not (unsigned) char *.", dwarf_diename(vr_die)); @@ -1017,7 +1017,7 @@ static int probe_point_search_cb(Dwarf_Die *sp_die, void *data) /* Check tag and diename */ if (dwarf_tag(sp_die) != DW_TAG_subprogram || - die_compare_name(sp_die, pp->function) != 0) + !die_compare_name(sp_die, pp->function)) return DWARF_CB_OK; pf->fname = dwarf_decl_file(sp_die); @@ -1340,7 +1340,7 @@ static int line_range_search_cb(Dwarf_Die *sp_die, void *data) struct line_range *lr = lf->lr; if (dwarf_tag(sp_die) == DW_TAG_subprogram && - die_compare_name(sp_die, lr->function) == 0) { + die_compare_name(sp_die, lr->function)) { lf->fname = dwarf_decl_file(sp_die); dwarf_decl_line(sp_die, &lr->offset); pr_debug("fname: %s, lineno:%d\n", lf->fname, lr->offset); ^ permalink raw reply [flat|nested] 4+ messages in thread
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2010-07-09 9:29 ` [PATCH 2/3] perf probe: Support comp_dir to find an absolute source path Masami Hiramatsu
2010-07-17 11:11 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
2010-07-09 9:29 ` [PATCH 3/3] perf probe: Fix the logic of die_compare_name Masami Hiramatsu
2010-07-17 11:11 ` [tip:perf/core] " tip-bot for Masami Hiramatsu
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