mirror of https://gitee.com/openkylin/linux.git
perf probe: Use elfutils-libdw for analyzing debuginfo
Newer gcc introduces newer & richer debuginfo, and only libdw in elfutils project can support it. So perf probe moves onto elfutils-libdw from libdwarf. Changes in v3: - Cast Dwarf_Addr/Dwarf_Word to uintmax_t for printf-formats. - Recover a sign-prefix which was removed in v2 by mistake. Changes in v2: - Fix a type-casting bug in Makefile. - Cast Dwarf_Addr/Dwarf_Word to unsigned long long for printf-formats. Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com> Cc: systemtap <systemtap@sources.redhat.com> Cc: DLE <dle-develop@lists.sourceforge.net> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Mike Galbraith <efault@gmx.de> Cc: K.Prasad <prasad@linux.vnet.ibm.com> Cc: Ulrich Drepper <drepper@redhat.com> Cc: Roland McGrath <roland@redhat.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com> LKML-Reference: <20100225133542.6725.34724.stgit@localhost6.localdomain6> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu
Ingo Molnar
parent
81cb8aa327
commit
804b36068e
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@ -500,12 +500,12 @@ else
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msg := $(error No libelf.h/libelf found, please install libelf-dev/elfutils-libelf-devel and glibc-dev[el]);
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endif
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ifneq ($(shell sh -c "(echo '\#ifndef _MIPS_SZLONG'; echo '\#define _MIPS_SZLONG 0'; echo '\#endif'; echo '\#include <dwarf.h>'; echo '\#include <libdwarf.h>'; echo 'int main(void) { Dwarf_Debug dbg; Dwarf_Error err; Dwarf_Ranges *rng; dwarf_init(0, DW_DLC_READ, 0, 0, &dbg, &err); dwarf_get_ranges(dbg, 0, &rng, 0, 0, &err); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/libdwarf -ldwarf -lelf -o $(BITBUCKET) $(ALL_LDFLAGS) $(EXTLIBS) "$(QUIET_STDERR)" && echo y"), y)
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msg := $(warning No libdwarf.h found or old libdwarf.h found, disables dwarf support. Please install libdwarf-dev/libdwarf-devel >= 20081231);
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BASIC_CFLAGS += -DNO_LIBDWARF
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ifneq ($(shell sh -c "(echo '\#include <dwarf.h>'; echo '\#include <libdw.h>'; echo 'int main(void) { Dwarf *dbg; dbg = dwarf_begin(0, DWARF_C_READ); return (long)dbg; }') | $(CC) -x c - $(ALL_CFLAGS) -D_LARGEFILE64_SOURCE -D_FILE_OFFSET_BITS=64 -I/usr/include/elfutils -ldw -lelf -o $(BITBUCKET) $(ALL_LDFLAGS) $(EXTLIBS) "$(QUIET_STDERR)" && echo y"), y)
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msg := $(warning No libdw.h found or old libdw.h found, disables dwarf support. Please install elfutils-devel/elfutils-dev);
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BASIC_CFLAGS += -DNO_DWARF_SUPPORT
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else
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BASIC_CFLAGS += -I/usr/include/libdwarf
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EXTLIBS += -lelf -ldwarf
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BASIC_CFLAGS += -I/usr/include/elfutils
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EXTLIBS += -lelf -ldw
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LIB_OBJS += util/probe-finder.o
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endif
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@ -128,7 +128,7 @@ static void evaluate_probe_point(struct probe_point *pp)
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pp->function);
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}
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#ifndef NO_LIBDWARF
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#ifndef NO_DWARF_SUPPORT
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static int open_vmlinux(void)
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{
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if (map__load(session.kmaps[MAP__FUNCTION], NULL) < 0) {
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@ -156,7 +156,7 @@ static const char * const probe_usage[] = {
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"perf probe [<options>] --add 'PROBEDEF' [--add 'PROBEDEF' ...]",
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"perf probe [<options>] --del '[GROUP:]EVENT' ...",
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"perf probe --list",
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#ifndef NO_LIBDWARF
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#ifndef NO_DWARF_SUPPORT
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"perf probe --line 'LINEDESC'",
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#endif
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NULL
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@ -165,7 +165,7 @@ static const char * const probe_usage[] = {
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static const struct option options[] = {
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OPT_BOOLEAN('v', "verbose", &verbose,
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"be more verbose (show parsed arguments, etc)"),
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#ifndef NO_LIBDWARF
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#ifndef NO_DWARF_SUPPORT
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OPT_STRING('k', "vmlinux", &symbol_conf.vmlinux_name,
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"file", "vmlinux pathname"),
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#endif
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@ -174,7 +174,7 @@ static const struct option options[] = {
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OPT_CALLBACK('d', "del", NULL, "[GROUP:]EVENT", "delete a probe event.",
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opt_del_probe_event),
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OPT_CALLBACK('a', "add", NULL,
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#ifdef NO_LIBDWARF
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#ifdef NO_DWARF_SUPPORT
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"[EVENT=]FUNC[+OFFS|%return] [ARG ...]",
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#else
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"[EVENT=]FUNC[+OFFS|%return|:RLN][@SRC]|SRC:ALN [ARG ...]",
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@ -185,7 +185,7 @@ static const struct option options[] = {
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"\t\tFUNC:\tFunction name\n"
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"\t\tOFFS:\tOffset from function entry (in byte)\n"
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"\t\t%return:\tPut the probe at function return\n"
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#ifdef NO_LIBDWARF
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#ifdef NO_DWARF_SUPPORT
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"\t\tARG:\tProbe argument (only \n"
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#else
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"\t\tSRC:\tSource code path\n"
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@ -197,7 +197,7 @@ static const struct option options[] = {
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opt_add_probe_event),
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OPT_BOOLEAN('f', "force", &session.force_add, "forcibly add events"
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" with existing name"),
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#ifndef NO_LIBDWARF
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#ifndef NO_DWARF_SUPPORT
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OPT_CALLBACK('L', "line", NULL,
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"FUNC[:RLN[+NUM|:RLN2]]|SRC:ALN[+NUM|:ALN2]",
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"Show source code lines.", opt_show_lines),
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@ -225,7 +225,7 @@ static void init_vmlinux(void)
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int cmd_probe(int argc, const char **argv, const char *prefix __used)
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{
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int i, ret;
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#ifndef NO_LIBDWARF
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#ifndef NO_DWARF_SUPPORT
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int fd;
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#endif
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struct probe_point *pp;
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@ -261,7 +261,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
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return 0;
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}
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#ifndef NO_LIBDWARF
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#ifndef NO_DWARF_SUPPORT
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if (session.show_lines) {
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if (session.nr_probe != 0 || session.dellist) {
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pr_warning(" Error: Don't use --line with"
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@ -292,9 +292,9 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
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init_vmlinux();
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if (session.need_dwarf)
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#ifdef NO_LIBDWARF
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#ifdef NO_DWARF_SUPPORT
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die("Debuginfo-analysis is not supported");
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#else /* !NO_LIBDWARF */
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#else /* !NO_DWARF_SUPPORT */
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pr_debug("Some probes require debuginfo.\n");
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fd = open_vmlinux();
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@ -335,7 +335,7 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
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close(fd);
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end_dwarf:
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#endif /* !NO_LIBDWARF */
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#endif /* !NO_DWARF_SUPPORT */
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/* Synthesize probes without dwarf */
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for (i = 0; i < session.nr_probe; i++) {
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File diff suppressed because it is too large
Load Diff
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@ -1,6 +1,7 @@
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#ifndef _PROBE_FINDER_H
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#define _PROBE_FINDER_H
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#include <stdbool.h>
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#include "util.h"
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#define MAX_PATH_LEN 256
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@ -46,53 +47,48 @@ struct line_range {
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char *function; /* Function name */
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unsigned int start; /* Start line number */
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unsigned int end; /* End line number */
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unsigned int offset; /* Start line offset */
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int offset; /* Start line offset */
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char *path; /* Real path name */
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struct list_head line_list; /* Visible lines */
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};
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#ifndef NO_LIBDWARF
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#ifndef NO_DWARF_SUPPORT
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extern int find_probe_point(int fd, struct probe_point *pp);
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extern int find_line_range(int fd, struct line_range *lr);
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/* Workaround for undefined _MIPS_SZLONG bug in libdwarf.h: */
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#ifndef _MIPS_SZLONG
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# define _MIPS_SZLONG 0
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#endif
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#include <dwarf.h>
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#include <libdwarf.h>
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#include <libdw.h>
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struct probe_finder {
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struct probe_point *pp; /* Target probe point */
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struct probe_point *pp; /* Target probe point */
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/* For function searching */
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Dwarf_Addr addr; /* Address */
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Dwarf_Unsigned fno; /* File number */
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Dwarf_Unsigned lno; /* Line number */
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Dwarf_Off inl_offs; /* Inline offset */
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Dwarf_Die cu_die; /* Current CU */
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Dwarf_Addr addr; /* Address */
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const char *fname; /* File name */
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int lno; /* Line number */
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void *origin; /* Inline origin addr */
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Dwarf_Die cu_die; /* Current CU */
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/* For variable searching */
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Dwarf_Addr cu_base; /* Current CU base address */
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Dwarf_Locdesc fbloc; /* Location of Current Frame Base */
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const char *var; /* Current variable name */
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char *buf; /* Current output buffer */
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int len; /* Length of output buffer */
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Dwarf_Op *fb_ops; /* Frame base attribute */
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Dwarf_Addr cu_base; /* Current CU base address */
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const char *var; /* Current variable name */
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char *buf; /* Current output buffer */
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int len; /* Length of output buffer */
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};
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struct line_finder {
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struct line_range *lr; /* Target line range */
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struct line_range *lr; /* Target line range */
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Dwarf_Unsigned fno; /* File number */
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Dwarf_Unsigned lno_s; /* Start line number */
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Dwarf_Unsigned lno_e; /* End line number */
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Dwarf_Addr addr_s; /* Start address */
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Dwarf_Addr addr_e; /* End address */
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Dwarf_Die cu_die; /* Current CU */
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const char *fname; /* File name */
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int lno_s; /* Start line number */
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int lno_e; /* End line number */
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Dwarf_Addr addr_s; /* Start address */
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Dwarf_Addr addr_e; /* End address */
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Dwarf_Die cu_die; /* Current CU */
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int found;
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};
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#endif /* NO_LIBDWARF */
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#endif /* NO_DWARF_SUPPORT */
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#endif /*_PROBE_FINDER_H */
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