[PATCH 16/20] tools lib traceevent: Get rid of die() in reparent_op_arg()
From: Arnaldo Carvalho de Melo
Date: Fri Dec 13 2013 - 10:16:51 EST
From: Namhyung Kim <namhyung@xxxxxxxxxx>
To do that, make the function returns the error code. Also pass
error_str so that it can set proper error message when error occurred.
Signed-off-by: Namhyung Kim <namhyung@xxxxxxxxxx>
Reviewed-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
Cc: Frederic Weisbecker <fweisbec@xxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Jiri Olsa <jolsa@xxxxxxxxxx>
Cc: Namhyung Kim <namhyung.kim@xxxxxxx>
Cc: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
Link: http://lkml.kernel.org/r/1386833777-3790-9-git-send-email-namhyung@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
---
tools/lib/traceevent/event-parse.h | 5 +-
tools/lib/traceevent/parse-filter.c | 94 +++++++++++++++++++++++--------------
2 files changed, 64 insertions(+), 35 deletions(-)
diff --git a/tools/lib/traceevent/event-parse.h b/tools/lib/traceevent/event-parse.h
index 89e4dfd40db6..5e4392d8e2d4 100644
--- a/tools/lib/traceevent/event-parse.h
+++ b/tools/lib/traceevent/event-parse.h
@@ -364,7 +364,10 @@ enum pevent_flag {
_PE(ILLEGAL_LVALUE, "illegal lvalue for string comparison"), \
_PE(INVALID_REGEX, "regex did not compute"), \
_PE(ILLEGAL_STRING_CMP, "illegal comparison for string"), \
- _PE(ILLEGAL_INTEGER_CMP,"illegal comparison for integer")
+ _PE(ILLEGAL_INTEGER_CMP,"illegal comparison for integer"), \
+ _PE(REPARENT_NOT_OP, "cannot reparent other than OP"), \
+ _PE(REPARENT_FAILED, "failed to reparent filter OP"), \
+ _PE(BAD_FILTER_ARG, "bad arg in filter tree")
#undef _PE
#define _PE(__code, __str) PEVENT_ERRNO__ ## __code
diff --git a/tools/lib/traceevent/parse-filter.c b/tools/lib/traceevent/parse-filter.c
index 774c3e4c1d9f..9b05892566e0 100644
--- a/tools/lib/traceevent/parse-filter.c
+++ b/tools/lib/traceevent/parse-filter.c
@@ -784,15 +784,18 @@ enum filter_vals {
FILTER_VAL_TRUE,
};
-void reparent_op_arg(struct filter_arg *parent, struct filter_arg *old_child,
- struct filter_arg *arg)
+static enum pevent_errno
+reparent_op_arg(struct filter_arg *parent, struct filter_arg *old_child,
+ struct filter_arg *arg, char **error_str)
{
struct filter_arg *other_child;
struct filter_arg **ptr;
if (parent->type != FILTER_ARG_OP &&
- arg->type != FILTER_ARG_OP)
- die("can not reparent other than OP");
+ arg->type != FILTER_ARG_OP) {
+ show_error(error_str, "can not reparent other than OP");
+ return PEVENT_ERRNO__REPARENT_NOT_OP;
+ }
/* Get the sibling */
if (old_child->op.right == arg) {
@@ -801,8 +804,10 @@ void reparent_op_arg(struct filter_arg *parent, struct filter_arg *old_child,
} else if (old_child->op.left == arg) {
ptr = &old_child->op.left;
other_child = old_child->op.right;
- } else
- die("Error in reparent op, find other child");
+ } else {
+ show_error(error_str, "Error in reparent op, find other child");
+ return PEVENT_ERRNO__REPARENT_FAILED;
+ }
/* Detach arg from old_child */
*ptr = NULL;
@@ -813,23 +818,29 @@ void reparent_op_arg(struct filter_arg *parent, struct filter_arg *old_child,
*parent = *arg;
/* Free arg without recussion */
free(arg);
- return;
+ return 0;
}
if (parent->op.right == old_child)
ptr = &parent->op.right;
else if (parent->op.left == old_child)
ptr = &parent->op.left;
- else
- die("Error in reparent op");
+ else {
+ show_error(error_str, "Error in reparent op");
+ return PEVENT_ERRNO__REPARENT_FAILED;
+ }
+
*ptr = arg;
free_arg(old_child);
+ return 0;
}
-enum filter_vals test_arg(struct filter_arg *parent, struct filter_arg *arg)
+/* Returns either filter_vals (success) or pevent_errno (failfure) */
+static int test_arg(struct filter_arg *parent, struct filter_arg *arg,
+ char **error_str)
{
- enum filter_vals lval, rval;
+ int lval, rval;
switch (arg->type) {
@@ -844,63 +855,68 @@ enum filter_vals test_arg(struct filter_arg *parent, struct filter_arg *arg)
return FILTER_VAL_NORM;
case FILTER_ARG_EXP:
- lval = test_arg(arg, arg->exp.left);
+ lval = test_arg(arg, arg->exp.left, error_str);
if (lval != FILTER_VAL_NORM)
return lval;
- rval = test_arg(arg, arg->exp.right);
+ rval = test_arg(arg, arg->exp.right, error_str);
if (rval != FILTER_VAL_NORM)
return rval;
return FILTER_VAL_NORM;
case FILTER_ARG_NUM:
- lval = test_arg(arg, arg->num.left);
+ lval = test_arg(arg, arg->num.left, error_str);
if (lval != FILTER_VAL_NORM)
return lval;
- rval = test_arg(arg, arg->num.right);
+ rval = test_arg(arg, arg->num.right, error_str);
if (rval != FILTER_VAL_NORM)
return rval;
return FILTER_VAL_NORM;
case FILTER_ARG_OP:
if (arg->op.type != FILTER_OP_NOT) {
- lval = test_arg(arg, arg->op.left);
+ lval = test_arg(arg, arg->op.left, error_str);
switch (lval) {
case FILTER_VAL_NORM:
break;
case FILTER_VAL_TRUE:
if (arg->op.type == FILTER_OP_OR)
return FILTER_VAL_TRUE;
- rval = test_arg(arg, arg->op.right);
+ rval = test_arg(arg, arg->op.right, error_str);
if (rval != FILTER_VAL_NORM)
return rval;
- reparent_op_arg(parent, arg, arg->op.right);
- return FILTER_VAL_NORM;
+ return reparent_op_arg(parent, arg, arg->op.right,
+ error_str);
case FILTER_VAL_FALSE:
if (arg->op.type == FILTER_OP_AND)
return FILTER_VAL_FALSE;
- rval = test_arg(arg, arg->op.right);
+ rval = test_arg(arg, arg->op.right, error_str);
if (rval != FILTER_VAL_NORM)
return rval;
- reparent_op_arg(parent, arg, arg->op.right);
- return FILTER_VAL_NORM;
+ return reparent_op_arg(parent, arg, arg->op.right,
+ error_str);
+
+ default:
+ return lval;
}
}
- rval = test_arg(arg, arg->op.right);
+ rval = test_arg(arg, arg->op.right, error_str);
switch (rval) {
case FILTER_VAL_NORM:
+ default:
break;
+
case FILTER_VAL_TRUE:
if (arg->op.type == FILTER_OP_OR)
return FILTER_VAL_TRUE;
if (arg->op.type == FILTER_OP_NOT)
return FILTER_VAL_FALSE;
- reparent_op_arg(parent, arg, arg->op.left);
- return FILTER_VAL_NORM;
+ return reparent_op_arg(parent, arg, arg->op.left,
+ error_str);
case FILTER_VAL_FALSE:
if (arg->op.type == FILTER_OP_AND)
@@ -908,26 +924,27 @@ enum filter_vals test_arg(struct filter_arg *parent, struct filter_arg *arg)
if (arg->op.type == FILTER_OP_NOT)
return FILTER_VAL_TRUE;
- reparent_op_arg(parent, arg, arg->op.left);
- return FILTER_VAL_NORM;
+ return reparent_op_arg(parent, arg, arg->op.left,
+ error_str);
}
- return FILTER_VAL_NORM;
+ return rval;
default:
- die("bad arg in filter tree");
+ show_error(error_str, "bad arg in filter tree");
+ return PEVENT_ERRNO__BAD_FILTER_ARG;
}
return FILTER_VAL_NORM;
}
/* Remove any unknown event fields */
-static struct filter_arg *collapse_tree(struct filter_arg *arg)
+static struct filter_arg *collapse_tree(struct filter_arg *arg, char **error_str)
{
enum filter_vals ret;
- ret = test_arg(arg, arg);
+ ret = test_arg(arg, arg, error_str);
switch (ret) {
case FILTER_VAL_NORM:
- return arg;
+ break;
case FILTER_VAL_TRUE:
case FILTER_VAL_FALSE:
@@ -936,7 +953,16 @@ static struct filter_arg *collapse_tree(struct filter_arg *arg)
if (arg) {
arg->type = FILTER_ARG_BOOLEAN;
arg->boolean.value = ret == FILTER_VAL_TRUE;
+ } else {
+ show_error(error_str, "Failed to allocate filter arg");
}
+ break;
+
+ default:
+ /* test_arg() already set the error_str */
+ free_arg(arg);
+ arg = NULL;
+ break;
}
return arg;
@@ -1152,9 +1178,9 @@ process_filter(struct event_format *event, struct filter_arg **parg,
if (!current_op)
current_op = current_exp;
- current_op = collapse_tree(current_op);
+ current_op = collapse_tree(current_op, error_str);
if (current_op == NULL)
- goto fail_alloc;
+ goto fail;
*parg = current_op;
--
1.8.1.4
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