From a64489c56c307bf0955f0489158c5ecf6aa10fe2 Mon Sep 17 00:00:00 2001 From: Jin Yao Date: Sun, 26 Mar 2017 04:34:26 +0800 Subject: [PATCH] perf report: Find the inline stack for a given address It would be useful for perf to support a mode to query the inline stack for a given callgraph address. This would simplify finding the right code in code that does a lot of inlining. The srcline.c has contained the code which supports to translate the address to filename:line_nr. This patch just extends the function to let it support getting the inline stacks. It introduces the inline_list which will store the inline function result (filename:line_nr and funcname). If BFD lib is not supported, the result is only filename:line_nr. Signed-off-by: Yao Jin Tested-by: Milian Wolff Cc: Andi Kleen Cc: Jiri Olsa Cc: Kan Liang Link: http://lkml.kernel.org/r/1490474069-15823-3-git-send-email-yao.jin@linux.intel.com Signed-off-by: Arnaldo Carvalho de Melo --- tools/perf/util/srcline.c | 167 ++++++++++++++++++++++++++++++- tools/perf/util/symbol-elf.c | 5 + tools/perf/util/symbol-minimal.c | 7 ++ tools/perf/util/symbol.h | 2 + tools/perf/util/util.h | 16 +++ 5 files changed, 192 insertions(+), 5 deletions(-) diff --git a/tools/perf/util/srcline.c b/tools/perf/util/srcline.c index 2953c9fecb30..3ce28f702b36 100644 --- a/tools/perf/util/srcline.c +++ b/tools/perf/util/srcline.c @@ -7,6 +7,7 @@ #include "util/dso.h" #include "util/util.h" #include "util/debug.h" +#include "util/callchain.h" #include "symbol.h" @@ -30,6 +31,34 @@ static const char *dso__name(struct dso *dso) return dso_name; } +static int inline_list__append(char *filename, char *funcname, int line_nr, + struct inline_node *node, struct dso *dso) +{ + struct inline_list *ilist; + char *demangled; + + ilist = zalloc(sizeof(*ilist)); + if (ilist == NULL) + return -1; + + ilist->filename = filename; + ilist->line_nr = line_nr; + + if (dso != NULL) { + demangled = dso__demangle_sym(dso, 0, funcname); + if (demangled == NULL) { + ilist->funcname = funcname; + } else { + ilist->funcname = demangled; + free(funcname); + } + } + + list_add_tail(&ilist->list, &node->val); + + return 0; +} + #ifdef HAVE_LIBBFD_SUPPORT /* @@ -169,9 +198,17 @@ static void addr2line_cleanup(struct a2l_data *a2l) #define MAX_INLINE_NEST 1024 +static void inline_list__reverse(struct inline_node *node) +{ + struct inline_list *ilist, *n; + + list_for_each_entry_safe_reverse(ilist, n, &node->val, list) + list_move_tail(&ilist->list, &node->val); +} + static int addr2line(const char *dso_name, u64 addr, char **file, unsigned int *line, struct dso *dso, - bool unwind_inlines) + bool unwind_inlines, struct inline_node *node) { int ret = 0; struct a2l_data *a2l = dso->a2l; @@ -196,8 +233,21 @@ static int addr2line(const char *dso_name, u64 addr, while (bfd_find_inliner_info(a2l->abfd, &a2l->filename, &a2l->funcname, &a2l->line) && - cnt++ < MAX_INLINE_NEST) - ; + cnt++ < MAX_INLINE_NEST) { + + if (node != NULL) { + if (inline_list__append(strdup(a2l->filename), + strdup(a2l->funcname), + a2l->line, node, + dso) != 0) + return 0; + } + } + + if ((node != NULL) && + (callchain_param.order != ORDER_CALLEE)) { + inline_list__reverse(node); + } } if (a2l->found && a2l->filename) { @@ -223,6 +273,35 @@ void dso__free_a2l(struct dso *dso) dso->a2l = NULL; } +static struct inline_node *addr2inlines(const char *dso_name, u64 addr, + struct dso *dso) +{ + char *file = NULL; + unsigned int line = 0; + struct inline_node *node; + + node = zalloc(sizeof(*node)); + if (node == NULL) { + perror("not enough memory for the inline node"); + return NULL; + } + + INIT_LIST_HEAD(&node->val); + node->addr = addr; + + if (!addr2line(dso_name, addr, &file, &line, dso, TRUE, node)) + goto out_free_inline_node; + + if (list_empty(&node->val)) + goto out_free_inline_node; + + return node; + +out_free_inline_node: + inline_node__delete(node); + return NULL; +} + #else /* HAVE_LIBBFD_SUPPORT */ static int filename_split(char *filename, unsigned int *line_nr) @@ -249,7 +328,8 @@ static int filename_split(char *filename, unsigned int *line_nr) 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) + bool unwind_inlines __maybe_unused, + struct inline_node *node __maybe_unused) { FILE *fp; char cmd[PATH_MAX]; @@ -288,6 +368,58 @@ void dso__free_a2l(struct dso *dso __maybe_unused) { } +static struct inline_node *addr2inlines(const char *dso_name, u64 addr, + struct dso *dso __maybe_unused) +{ + FILE *fp; + char cmd[PATH_MAX]; + struct inline_node *node; + char *filename = NULL; + size_t len; + unsigned int line_nr = 0; + + scnprintf(cmd, sizeof(cmd), "addr2line -e %s -i %016"PRIx64, + dso_name, addr); + + fp = popen(cmd, "r"); + if (fp == NULL) { + pr_err("popen failed for %s\n", dso_name); + return NULL; + } + + node = zalloc(sizeof(*node)); + if (node == NULL) { + perror("not enough memory for the inline node"); + goto out; + } + + INIT_LIST_HEAD(&node->val); + node->addr = addr; + + while (getline(&filename, &len, fp) != -1) { + if (filename_split(filename, &line_nr) != 1) { + free(filename); + goto out; + } + + if (inline_list__append(filename, NULL, line_nr, node, + NULL) != 0) + goto out; + + filename = NULL; + } + +out: + pclose(fp); + + if (list_empty(&node->val)) { + inline_node__delete(node); + return NULL; + } + + return node; +} + #endif /* HAVE_LIBBFD_SUPPORT */ /* @@ -311,7 +443,7 @@ char *__get_srcline(struct dso *dso, u64 addr, struct symbol *sym, if (dso_name == NULL) goto out; - if (!addr2line(dso_name, addr, &file, &line, dso, unwind_inlines)) + if (!addr2line(dso_name, addr, &file, &line, dso, unwind_inlines, NULL)) goto out; if (asprintf(&srcline, "%s:%u", @@ -351,3 +483,28 @@ char *get_srcline(struct dso *dso, u64 addr, struct symbol *sym, { return __get_srcline(dso, addr, sym, show_sym, false); } + +struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr) +{ + const char *dso_name; + + dso_name = dso__name(dso); + if (dso_name == NULL) + return NULL; + + return addr2inlines(dso_name, addr, dso); +} + +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); + zfree(&ilist->filename); + zfree(&ilist->funcname); + free(ilist); + } + + free(node); +} diff --git a/tools/perf/util/symbol-elf.c b/tools/perf/util/symbol-elf.c index 0e660dba58ad..d1a40bb642ff 100644 --- a/tools/perf/util/symbol-elf.c +++ b/tools/perf/util/symbol-elf.c @@ -390,6 +390,11 @@ out_elf_end: return 0; } +char *dso__demangle_sym(struct dso *dso, int kmodule, char *elf_name) +{ + return demangle_sym(dso, kmodule, elf_name); +} + /* * Align offset to 4 bytes as needed for note name and descriptor data. */ diff --git a/tools/perf/util/symbol-minimal.c b/tools/perf/util/symbol-minimal.c index 11cdde980545..870ef0f0659c 100644 --- a/tools/perf/util/symbol-minimal.c +++ b/tools/perf/util/symbol-minimal.c @@ -373,3 +373,10 @@ int kcore_copy(const char *from_dir __maybe_unused, void symbol__elf_init(void) { } + +char *dso__demangle_sym(struct dso *dso __maybe_unused, + int kmodule __maybe_unused, + char *elf_name __maybe_unused) +{ + return NULL; +} diff --git a/tools/perf/util/symbol.h b/tools/perf/util/symbol.h index 9222c7e702f3..e36213ccfcf7 100644 --- a/tools/perf/util/symbol.h +++ b/tools/perf/util/symbol.h @@ -305,6 +305,8 @@ int dso__load_sym(struct dso *dso, struct map *map, struct symsrc *syms_ss, int dso__synthesize_plt_symbols(struct dso *dso, struct symsrc *ss, struct map *map); +char *dso__demangle_sym(struct dso *dso, int kmodule, char *elf_name); + void __symbols__insert(struct rb_root *symbols, struct symbol *sym, bool kernel); void symbols__insert(struct rb_root *symbols, struct symbol *sym); void symbols__fixup_duplicate(struct rb_root *symbols); diff --git a/tools/perf/util/util.h b/tools/perf/util/util.h index b2cfa47990dc..cc0700d6fef0 100644 --- a/tools/perf/util/util.h +++ b/tools/perf/util/util.h @@ -364,4 +364,20 @@ int is_printable_array(char *p, unsigned int len); int timestamp__scnprintf_usec(u64 timestamp, char *buf, size_t sz); int unit_number__scnprintf(char *buf, size_t size, u64 n); + +struct inline_list { + char *filename; + char *funcname; + unsigned int line_nr; + struct list_head list; +}; + +struct inline_node { + u64 addr; + struct list_head val; +}; + +struct inline_node *dso__parse_addr_inlines(struct dso *dso, u64 addr); +void inline_node__delete(struct inline_node *node); + #endif /* GIT_COMPAT_UTIL_H */ -- 2.30.2