lkml.org 
[lkml]   [2009]   [Oct]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH -tip tracing/kprobes 6/9] perf: Use die() for error cases in perf-probe
Date
Use die() for exiting perf-probe with errors. This replaces
perror_exit(), msg_exit() and fprintf()+exit() with die(), and
uses die() in semantic_error().
This also renames 'die' local variables to 'dw_die' for avoiding
name confliction.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <a.p.zijlstra@chello.nl>
Cc: Christoph Hellwig <hch@infradead.org>
Cc: Ananth N Mavinakayanahalli <ananth@in.ibm.com>
Cc: Jim Keniston <jkenisto@us.ibm.com>
Cc: Frank Ch. Eigler <fche@redhat.com>
---
tools/perf/builtin-probe.c | 47 ++++++++++------------------------
tools/perf/util/probe-finder.c | 55 +++++++++++++++-------------------------
2 files changed, 34 insertions(+), 68 deletions(-)
diff --git a/tools/perf/builtin-probe.c b/tools/perf/builtin-probe.c
index 73c883b..a1467d1 100644
--- a/tools/perf/builtin-probe.c
+++ b/tools/perf/builtin-probe.c
@@ -49,6 +49,7 @@ const char *default_search_path[NR_SEARCH_PATH] = {

#define MAX_PATH_LEN 256
#define MAX_PROBES 128
+#define MAX_PROBE_ARGS 128

/* Session management structure */
static struct {
@@ -60,19 +61,7 @@ static struct {
char *events[MAX_PROBES];
} session;

-static void semantic_error(const char *msg)
-{
- fprintf(stderr, "Semantic error: %s\n", msg);
- exit(1);
-}
-
-static void perror_exit(const char *msg)
-{
- perror(msg);
- exit(1);
-}
-
-#define MAX_PROBE_ARGS 128
+#define semantic_error(msg ...) die("Semantic error :" msg)

static int parse_probepoint(const struct option *opt __used,
const char *str, int unset __used)
@@ -109,7 +98,7 @@ static int parse_probepoint(const struct option *opt __used,
/* Duplicate the argument */
argv[argc] = strndup(s, str - s);
if (argv[argc] == NULL)
- perror_exit("strndup");
+ die("strndup");
if (++argc == MAX_PROBE_ARGS)
semantic_error("Too many arguments");
debug("argv[%d]=%s\n", argc, argv[argc - 1]);
@@ -171,7 +160,7 @@ static int parse_probepoint(const struct option *opt __used,
if (pp->nr_args > 0) {
pp->args = (char **)malloc(sizeof(char *) * pp->nr_args);
if (!pp->args)
- perror_exit("malloc");
+ die("malloc");
memcpy(pp->args, &argv[2], sizeof(char *) * pp->nr_args);
}

@@ -260,7 +249,7 @@ static int write_new_event(int fd, const char *buf)
printf("Adding new event: %s\n", buf);
ret = write(fd, buf, strlen(buf));
if (ret <= 0)
- perror("Error: Failed to create event");
+ die("failed to create event.");

return ret;
}
@@ -273,7 +262,7 @@ static int synthesize_probepoint(struct probe_point *pp)
int i, len, ret;
pp->probes[0] = buf = (char *)calloc(MAX_CMDLEN, sizeof(char));
if (!buf)
- perror_exit("calloc");
+ die("calloc");
ret = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
if (ret <= 0 || ret >= MAX_CMDLEN)
goto error;
@@ -322,10 +311,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
ret = synthesize_probepoint(&session.probes[j]);
if (ret == -E2BIG)
semantic_error("probe point is too long.");
- else if (ret < 0) {
- perror("snprintf");
- return -1;
- }
+ else if (ret < 0)
+ die("snprintf");
}

#ifndef NO_LIBDWARF
@@ -336,10 +323,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
fd = open(session.vmlinux, O_RDONLY);
else
fd = open_default_vmlinux();
- if (fd < 0) {
- perror("vmlinux/module file open");
- return -1;
- }
+ if (fd < 0)
+ die("vmlinux/module file open");

/* Searching probe points */
for (j = 0; j < session.nr_probe; j++) {
@@ -349,10 +334,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)

lseek(fd, SEEK_SET, 0);
ret = find_probepoint(fd, pp);
- if (ret <= 0) {
- fprintf(stderr, "Error: No probe point found.\n");
- return -1;
- }
+ if (ret <= 0)
+ die("No probe point found.\n");
debug("probe event %s found\n", session.events[j]);
}
close(fd);
@@ -363,10 +346,8 @@ setup_probes:
/* Settng up probe points */
snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
fd = open(buf, O_WRONLY, O_APPEND);
- if (fd < 0) {
- perror("kprobe_events open");
- return -1;
- }
+ if (fd < 0)
+ die("kprobe_events open");
for (j = 0; j < session.nr_probe; j++) {
pp = &session.probes[j];
if (pp->found == 1) {
diff --git a/tools/perf/util/probe-finder.c b/tools/perf/util/probe-finder.c
index ec6f53f..338fdb9 100644
--- a/tools/perf/util/probe-finder.c
+++ b/tools/perf/util/probe-finder.c
@@ -31,6 +31,8 @@
#include <string.h>
#include <stdarg.h>
#include <ctype.h>
+
+#include "util.h"
#include "probe-finder.h"


@@ -43,20 +45,6 @@ struct die_link {
static Dwarf_Debug __dw_debug;
static Dwarf_Error __dw_error;

-static void msg_exit(int ret, const char *fmt, ...)
-{
- va_list ap;
-
- va_start(ap, fmt);
- fprintf(stderr, "Error: ");
- vfprintf(stderr, fmt, ap);
- va_end(ap);
-
- fprintf(stderr, "\n");
- exit(ret);
-}
-
-
/*
* Generic dwarf analysis helpers
*/
@@ -151,11 +139,11 @@ static Dwarf_Unsigned die_get_fileno(Dwarf_Die cu_die, const char *fname)
}

/* Compare diename and tname */
-static int die_compare_name(Dwarf_Die die, const char *tname)
+static int die_compare_name(Dwarf_Die dw_die, const char *tname)
{
char *name;
int ret;
- ret = dwarf_diename(die, &name, &__dw_error);
+ ret = dwarf_diename(dw_die, &name, &__dw_error);
ERR_IF(ret == DW_DLV_ERROR);
if (ret == DW_DLV_OK) {
ret = strcmp(tname, name);
@@ -187,25 +175,25 @@ static int die_within_subprogram(Dwarf_Die sp_die, Dwarf_Addr addr,
}

/* Check the die is inlined function */
-static Dwarf_Bool die_inlined_subprogram(Dwarf_Die die)
+static Dwarf_Bool die_inlined_subprogram(Dwarf_Die dw_die)
{
/* TODO: check strictly */
Dwarf_Bool inl;
int ret;

- ret = dwarf_hasattr(die, DW_AT_inline, &inl, &__dw_error);
+ ret = dwarf_hasattr(dw_die, DW_AT_inline, &inl, &__dw_error);
ERR_IF(ret == DW_DLV_ERROR);
return inl;
}

/* Get the offset of abstruct_origin */
-static Dwarf_Off die_get_abstract_origin(Dwarf_Die die)
+static Dwarf_Off die_get_abstract_origin(Dwarf_Die dw_die)
{
Dwarf_Attribute attr;
Dwarf_Off cu_offs;
int ret;

- ret = dwarf_attr(die, DW_AT_abstract_origin, &attr, &__dw_error);
+ ret = dwarf_attr(dw_die, DW_AT_abstract_origin, &attr, &__dw_error);
ERR_IF(ret != DW_DLV_OK);
ret = dwarf_formref(attr, &cu_offs, &__dw_error);
ERR_IF(ret != DW_DLV_OK);
@@ -214,7 +202,7 @@ static Dwarf_Off die_get_abstract_origin(Dwarf_Die die)
}

/* Get entry pc(or low pc, 1st entry of ranges) of the die */
-static Dwarf_Addr die_get_entrypc(Dwarf_Die die)
+static Dwarf_Addr die_get_entrypc(Dwarf_Die dw_die)
{
Dwarf_Attribute attr;
Dwarf_Addr addr;
@@ -224,7 +212,7 @@ static Dwarf_Addr die_get_entrypc(Dwarf_Die die)
int ret;

/* Try to get entry pc */
- ret = dwarf_attr(die, DW_AT_entry_pc, &attr, &__dw_error);
+ ret = dwarf_attr(dw_die, DW_AT_entry_pc, &attr, &__dw_error);
ERR_IF(ret == DW_DLV_ERROR);
if (ret == DW_DLV_OK) {
ret = dwarf_formaddr(attr, &addr, &__dw_error);
@@ -234,13 +222,13 @@ static Dwarf_Addr die_get_entrypc(Dwarf_Die die)
}

/* Try to get low pc */
- ret = dwarf_lowpc(die, &addr, &__dw_error);
+ ret = dwarf_lowpc(dw_die, &addr, &__dw_error);
ERR_IF(ret == DW_DLV_ERROR);
if (ret == DW_DLV_OK)
return addr;

/* Try to get ranges */
- ret = dwarf_attr(die, DW_AT_ranges, &attr, &__dw_error);
+ ret = dwarf_attr(dw_die, DW_AT_ranges, &attr, &__dw_error);
ERR_IF(ret != DW_DLV_OK);
ret = dwarf_formref(attr, &offs, &__dw_error);
ERR_IF(ret != DW_DLV_OK);
@@ -382,11 +370,11 @@ static void show_location(Dwarf_Loc *loc, struct probe_finder *pf)
} else if (op == DW_OP_regx) {
regn = loc->lr_number;
} else
- msg_exit(-EINVAL, "Dwarf_OP %d is not supported.\n", op);
+ die("Dwarf_OP %d is not supported.\n", op);

regs = get_arch_regstr(regn);
if (!regs)
- msg_exit(-EINVAL, "%lld exceeds max register number.\n", regn);
+ die("%lld exceeds max register number.\n", regn);

if (deref)
ret = snprintf(pf->buf, pf->len,
@@ -417,8 +405,8 @@ static void show_variable(Dwarf_Die vr_die, struct probe_finder *pf)
dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
return ;
error:
- msg_exit(-1, "Failed to find the location of %s at this address.\n"
- " Perhaps, it was optimized out.\n", pf->var);
+ die("Failed to find the location of %s at this address.\n"
+ " Perhaps, it has been optimized out.\n", pf->var);
}

static int variable_callback(struct die_link *dlink, void *data)
@@ -456,8 +444,7 @@ static void find_variable(Dwarf_Die sp_die, struct probe_finder *pf)
/* Search child die for local variables and parameters. */
ret = search_die_from_children(sp_die, variable_callback, pf);
if (!ret)
- msg_exit(-1, "Failed to find '%s' in this function.\n",
- pf->var);
+ die("Failed to find '%s' in this function.\n", pf->var);
}

/* Get a frame base on the address */
@@ -568,8 +555,7 @@ static void find_by_line(Dwarf_Die cu_die, struct probe_finder *pf)
/* Search a real subprogram including this line, */
ret = search_die_from_children(cu_die, probeaddr_callback, pf);
if (ret == 0)
- msg_exit(-1,
- "Probe point is not found in subprograms.\n");
+ die("Probe point is not found in subprograms.\n");
/* Continuing, because target line might be inlined. */
}
dwarf_srclines_dealloc(__dw_debug, lines, cnt);
@@ -621,7 +607,7 @@ static int probefunc_callback(struct die_link *dlink, void *data)
!die_inlined_subprogram(lk->die))
goto found;
}
- msg_exit(-1, "Failed to find real subprogram.\n");
+ die("Failed to find real subprogram.\n");
found:
/* Get offset from subprogram */
ret = die_within_subprogram(lk->die, pf->addr, &offs);
@@ -649,8 +635,7 @@ int find_probepoint(int fd, struct probe_point *pp)

ret = dwarf_init(fd, DW_DLC_READ, 0, 0, &__dw_debug, &__dw_error);
if (ret != DW_DLV_OK)
- msg_exit(-1, "Failed to call dwarf_init(). "
- "Maybe, not a dwarf file?\n");
+ die("Failed to call dwarf_init(). Maybe, not a dwarf file.\n");

pp->found = 0;
while (++cu_number) {

--
Masami Hiramatsu

Software Engineer
Hitachi Computer Products (America), Inc.
Software Solutions Division

e-mail: mhiramat@redhat.com


\
 
 \ /
  Last update: 2009-10-17 02:11    [W:0.140 / U:0.412 seconds]
©2003-2011 Jasper Spaans. Advertise on this site