mirror of https://gitee.com/openkylin/linux.git
perf: Use die() for error cases in perf-probe
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: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Paul Mackerras <paulus@samba.org> Cc: Peter Zijlstra <a.p.zijlstra@chello.nl> LKML-Reference: <20091017000801.16556.46866.stgit@dhcp-100-2-132.bos.redhat.com> Signed-off-by: Ingo Molnar <mingo@elte.hu>
This commit is contained in:
Masami Hiramatsu
Ingo Molnar
parent
4c20194c2d
commit
074fc0e4b3
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@ -49,6 +49,7 @@ const char *default_search_path[NR_SEARCH_PATH] = {
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#define MAX_PATH_LEN 256
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#define MAX_PROBES 128
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#define MAX_PROBE_ARGS 128
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/* Session management structure */
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static struct {
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@ -60,19 +61,7 @@ static struct {
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char *events[MAX_PROBES];
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} session;
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static void semantic_error(const char *msg)
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{
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fprintf(stderr, "Semantic error: %s\n", msg);
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exit(1);
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}
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static void perror_exit(const char *msg)
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{
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perror(msg);
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exit(1);
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}
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#define MAX_PROBE_ARGS 128
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#define semantic_error(msg ...) die("Semantic error :" msg)
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static int parse_probepoint(const struct option *opt __used,
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const char *str, int unset __used)
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@ -109,7 +98,7 @@ static int parse_probepoint(const struct option *opt __used,
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/* Duplicate the argument */
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argv[argc] = strndup(s, str - s);
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if (argv[argc] == NULL)
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perror_exit("strndup");
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die("strndup");
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if (++argc == MAX_PROBE_ARGS)
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semantic_error("Too many arguments");
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debug("argv[%d]=%s\n", argc, argv[argc - 1]);
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@ -171,7 +160,7 @@ static int parse_probepoint(const struct option *opt __used,
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if (pp->nr_args > 0) {
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pp->args = (char **)malloc(sizeof(char *) * pp->nr_args);
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if (!pp->args)
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perror_exit("malloc");
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die("malloc");
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memcpy(pp->args, &argv[2], sizeof(char *) * pp->nr_args);
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}
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@ -260,7 +249,7 @@ static int write_new_event(int fd, const char *buf)
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printf("Adding new event: %s\n", buf);
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ret = write(fd, buf, strlen(buf));
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if (ret <= 0)
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perror("Error: Failed to create event");
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die("failed to create event.");
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return ret;
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}
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@ -273,7 +262,7 @@ static int synthesize_probepoint(struct probe_point *pp)
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int i, len, ret;
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pp->probes[0] = buf = (char *)calloc(MAX_CMDLEN, sizeof(char));
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if (!buf)
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perror_exit("calloc");
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die("calloc");
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ret = snprintf(buf, MAX_CMDLEN, "%s+%d", pp->function, pp->offset);
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if (ret <= 0 || ret >= MAX_CMDLEN)
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goto error;
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@ -322,10 +311,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
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ret = synthesize_probepoint(&session.probes[j]);
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if (ret == -E2BIG)
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semantic_error("probe point is too long.");
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else if (ret < 0) {
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perror("snprintf");
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return -1;
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}
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else if (ret < 0)
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die("snprintf");
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}
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#ifndef NO_LIBDWARF
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@ -336,10 +323,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
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fd = open(session.vmlinux, O_RDONLY);
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else
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fd = open_default_vmlinux();
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if (fd < 0) {
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perror("vmlinux/module file open");
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return -1;
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}
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if (fd < 0)
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die("vmlinux/module file open");
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/* Searching probe points */
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for (j = 0; j < session.nr_probe; j++) {
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@ -349,10 +334,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
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lseek(fd, SEEK_SET, 0);
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ret = find_probepoint(fd, pp);
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if (ret <= 0) {
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fprintf(stderr, "Error: No probe point found.\n");
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return -1;
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}
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if (ret <= 0)
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die("No probe point found.\n");
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debug("probe event %s found\n", session.events[j]);
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}
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close(fd);
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@ -363,10 +346,8 @@ int cmd_probe(int argc, const char **argv, const char *prefix __used)
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/* Settng up probe points */
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snprintf(buf, MAX_CMDLEN, "%s/../kprobe_events", debugfs_path);
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fd = open(buf, O_WRONLY, O_APPEND);
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if (fd < 0) {
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perror("kprobe_events open");
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return -1;
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}
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if (fd < 0)
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die("kprobe_events open");
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for (j = 0; j < session.nr_probe; j++) {
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pp = &session.probes[j];
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if (pp->found == 1) {
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@ -31,6 +31,8 @@
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#include <string.h>
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#include <stdarg.h>
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#include <ctype.h>
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#include "util.h"
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#include "probe-finder.h"
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@ -43,20 +45,6 @@ struct die_link {
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static Dwarf_Debug __dw_debug;
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static Dwarf_Error __dw_error;
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static void msg_exit(int ret, const char *fmt, ...)
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{
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va_list ap;
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va_start(ap, fmt);
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fprintf(stderr, "Error: ");
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vfprintf(stderr, fmt, ap);
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va_end(ap);
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fprintf(stderr, "\n");
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exit(ret);
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}
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/*
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* Generic dwarf analysis helpers
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*/
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@ -151,11 +139,11 @@ static Dwarf_Unsigned die_get_fileno(Dwarf_Die cu_die, const char *fname)
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}
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/* Compare diename and tname */
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static int die_compare_name(Dwarf_Die die, const char *tname)
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static int die_compare_name(Dwarf_Die dw_die, const char *tname)
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{
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char *name;
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int ret;
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ret = dwarf_diename(die, &name, &__dw_error);
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ret = dwarf_diename(dw_die, &name, &__dw_error);
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ERR_IF(ret == DW_DLV_ERROR);
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if (ret == DW_DLV_OK) {
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ret = strcmp(tname, name);
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@ -187,25 +175,25 @@ static int die_within_subprogram(Dwarf_Die sp_die, Dwarf_Addr addr,
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}
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/* Check the die is inlined function */
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static Dwarf_Bool die_inlined_subprogram(Dwarf_Die die)
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static Dwarf_Bool die_inlined_subprogram(Dwarf_Die dw_die)
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{
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/* TODO: check strictly */
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Dwarf_Bool inl;
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int ret;
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ret = dwarf_hasattr(die, DW_AT_inline, &inl, &__dw_error);
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ret = dwarf_hasattr(dw_die, DW_AT_inline, &inl, &__dw_error);
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ERR_IF(ret == DW_DLV_ERROR);
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return inl;
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}
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/* Get the offset of abstruct_origin */
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static Dwarf_Off die_get_abstract_origin(Dwarf_Die die)
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static Dwarf_Off die_get_abstract_origin(Dwarf_Die dw_die)
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{
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Dwarf_Attribute attr;
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Dwarf_Off cu_offs;
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int ret;
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ret = dwarf_attr(die, DW_AT_abstract_origin, &attr, &__dw_error);
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ret = dwarf_attr(dw_die, DW_AT_abstract_origin, &attr, &__dw_error);
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ERR_IF(ret != DW_DLV_OK);
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ret = dwarf_formref(attr, &cu_offs, &__dw_error);
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ERR_IF(ret != DW_DLV_OK);
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@ -214,7 +202,7 @@ static Dwarf_Off die_get_abstract_origin(Dwarf_Die die)
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}
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/* Get entry pc(or low pc, 1st entry of ranges) of the die */
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static Dwarf_Addr die_get_entrypc(Dwarf_Die die)
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static Dwarf_Addr die_get_entrypc(Dwarf_Die dw_die)
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{
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Dwarf_Attribute attr;
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Dwarf_Addr addr;
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@ -224,7 +212,7 @@ static Dwarf_Addr die_get_entrypc(Dwarf_Die die)
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int ret;
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/* Try to get entry pc */
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ret = dwarf_attr(die, DW_AT_entry_pc, &attr, &__dw_error);
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ret = dwarf_attr(dw_die, DW_AT_entry_pc, &attr, &__dw_error);
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ERR_IF(ret == DW_DLV_ERROR);
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if (ret == DW_DLV_OK) {
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ret = dwarf_formaddr(attr, &addr, &__dw_error);
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@ -234,13 +222,13 @@ static Dwarf_Addr die_get_entrypc(Dwarf_Die die)
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}
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/* Try to get low pc */
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ret = dwarf_lowpc(die, &addr, &__dw_error);
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ret = dwarf_lowpc(dw_die, &addr, &__dw_error);
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ERR_IF(ret == DW_DLV_ERROR);
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if (ret == DW_DLV_OK)
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return addr;
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/* Try to get ranges */
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ret = dwarf_attr(die, DW_AT_ranges, &attr, &__dw_error);
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ret = dwarf_attr(dw_die, DW_AT_ranges, &attr, &__dw_error);
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ERR_IF(ret != DW_DLV_OK);
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ret = dwarf_formref(attr, &offs, &__dw_error);
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ERR_IF(ret != DW_DLV_OK);
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@ -382,11 +370,11 @@ static void show_location(Dwarf_Loc *loc, struct probe_finder *pf)
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} else if (op == DW_OP_regx) {
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regn = loc->lr_number;
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} else
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msg_exit(-EINVAL, "Dwarf_OP %d is not supported.\n", op);
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die("Dwarf_OP %d is not supported.\n", op);
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regs = get_arch_regstr(regn);
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if (!regs)
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msg_exit(-EINVAL, "%lld exceeds max register number.\n", regn);
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die("%lld exceeds max register number.\n", regn);
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if (deref)
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ret = snprintf(pf->buf, pf->len,
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@ -417,8 +405,8 @@ static void show_variable(Dwarf_Die vr_die, struct probe_finder *pf)
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dwarf_dealloc(__dw_debug, attr, DW_DLA_ATTR);
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return ;
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error:
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msg_exit(-1, "Failed to find the location of %s at this address.\n"
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" Perhaps, it was optimized out.\n", pf->var);
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die("Failed to find the location of %s at this address.\n"
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" Perhaps, it has been optimized out.\n", pf->var);
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}
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static int variable_callback(struct die_link *dlink, void *data)
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@ -456,8 +444,7 @@ static void find_variable(Dwarf_Die sp_die, struct probe_finder *pf)
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/* Search child die for local variables and parameters. */
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ret = search_die_from_children(sp_die, variable_callback, pf);
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if (!ret)
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msg_exit(-1, "Failed to find '%s' in this function.\n",
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pf->var);
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die("Failed to find '%s' in this function.\n", pf->var);
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}
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/* Get a frame base on the address */
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@ -568,8 +555,7 @@ static void find_by_line(Dwarf_Die cu_die, struct probe_finder *pf)
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/* Search a real subprogram including this line, */
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ret = search_die_from_children(cu_die, probeaddr_callback, pf);
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if (ret == 0)
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msg_exit(-1,
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"Probe point is not found in subprograms.\n");
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die("Probe point is not found in subprograms.\n");
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/* Continuing, because target line might be inlined. */
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}
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dwarf_srclines_dealloc(__dw_debug, lines, cnt);
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@ -621,7 +607,7 @@ static int probefunc_callback(struct die_link *dlink, void *data)
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!die_inlined_subprogram(lk->die))
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goto found;
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}
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msg_exit(-1, "Failed to find real subprogram.\n");
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die("Failed to find real subprogram.\n");
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found:
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/* Get offset from subprogram */
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ret = die_within_subprogram(lk->die, pf->addr, &offs);
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@ -649,8 +635,7 @@ int find_probepoint(int fd, struct probe_point *pp)
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ret = dwarf_init(fd, DW_DLC_READ, 0, 0, &__dw_debug, &__dw_error);
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if (ret != DW_DLV_OK)
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msg_exit(-1, "Failed to call dwarf_init(). "
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"Maybe, not a dwarf file?\n");
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die("Failed to call dwarf_init(). Maybe, not a dwarf file.\n");
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pp->found = 0;
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while (++cu_number) {
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