perf: Use die() for error cases in perf-probe
Masami Hiramatsu [Sat, 17 Oct 2009 00:08:01 +0000 (20:08 -0400)]
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>

tools/perf/builtin-probe.c
tools/perf/util/probe-finder.c

index 73c883b..a1467d1 100644 (file)
@@ -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) {
index ec6f53f..338fdb9 100644 (file)
@@ -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) {