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perf probe: Support "string" type

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Support string type casting to event argument. If perf-probe finds an argument
casted as string, it ensures the target variable is "(unsigned/signed) char
*(or []). perf-probe also adds dereference if the target is a pointer.

So, both of 'char buf[10];' and 'char *buf;' can be accessed by 'buf:string'

Cc: Ingo Molnar <mingo@elte.hu>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
LKML-Reference: <20100519195734.2885.1666.stgit@localhost6.localdomain6>
Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Masami Hiramatsu 2010-05-19 15:57:35 -04:00 committed by Arnaldo Carvalho de Melo
parent e09c8614b3
commit 73317b9540
2 changed files with 49 additions and 12 deletions
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2
tools/perf/Documentation/perf-probe.txt
View file

@ -95,7 +95,7 @@ Each probe argument follows below syntax.
[NAME=]LOCALVAR|$retval|%REG|@SYMBOL[:TYPE]
'NAME' specifies the name of this argument (optional). You can use the name of local variable, local data structure member (e.g. var->field, var.field2), or kprobe-tracer argument format (e.g. $retval, %ax, etc). Note that the name of this argument will be set as the last member name if you specify a local data structure member (e.g. field2 for 'var->field1.field2'.)
'TYPE' casts the type of this argument (optional). If omitted, perf probe automatically set the type based on debuginfo.
'TYPE' casts the type of this argument (optional). If omitted, perf probe automatically set the type based on debuginfo. You can specify 'string' type only for the local variable or structure member which is an array of or a pointer to 'char' or 'unsigned char' type.
LINE SYNTAX
-----------

59
tools/perf/util/probe-finder.c
View file

@ -464,18 +464,61 @@ static int convert_location(Dwarf_Op *op, struct probe_finder *pf)
}
static int convert_variable_type(Dwarf_Die *vr_die,
struct kprobe_trace_arg *targ)
struct kprobe_trace_arg *tvar,
const char *cast)
{
struct kprobe_trace_arg_ref **ref_ptr = &tvar->ref;
Dwarf_Die type;
char buf[16];
int ret;
/* TODO: check all types */
if (cast && strcmp(cast, "string") != 0) {
/* Non string type is OK */
tvar->type = strdup(cast);
return (tvar->type == NULL) ? -ENOMEM : 0;
}
if (die_get_real_type(vr_die, &type) == NULL) {
pr_warning("Failed to get a type information of %s.\n",
dwarf_diename(vr_die));
return -ENOENT;
}
if (cast && strcmp(cast, "string") == 0) { /* String type */
ret = dwarf_tag(&type);
if (ret != DW_TAG_pointer_type &&
ret != DW_TAG_array_type) {
pr_warning("Failed to cast into string: "
"%s(%s) is not a pointer nor array.",
dwarf_diename(vr_die), dwarf_diename(&type));
return -EINVAL;
}
if (ret == DW_TAG_pointer_type) {
if (die_get_real_type(&type, &type) == NULL) {
pr_warning("Failed to get a type information.");
return -ENOENT;
}
while (*ref_ptr)
ref_ptr = &(*ref_ptr)->next;
/* Add new reference with offset +0 */
*ref_ptr = zalloc(sizeof(struct kprobe_trace_arg_ref));
if (*ref_ptr == NULL) {
pr_warning("Out of memory error\n");
return -ENOMEM;
}
}
if (die_compare_name(&type, "char") != 0 &&
die_compare_name(&type, "unsigned char") != 0) {
pr_warning("Failed to cast into string: "
"%s is not (unsigned) char *.",
dwarf_diename(vr_die));
return -EINVAL;
}
tvar->type = strdup(cast);
return (tvar->type == NULL) ? -ENOMEM : 0;
}
ret = die_get_byte_size(&type) * 8;
if (ret) {
/* Check the bitwidth */
@ -495,8 +538,8 @@ static int convert_variable_type(Dwarf_Die *vr_die,
strerror(-ret));
return ret;
}
targ->type = strdup(buf);
if (targ->type == NULL)
tvar->type = strdup(buf);
if (tvar->type == NULL)
return -ENOMEM;
}
return 0;
@ -606,14 +649,8 @@ static int convert_variable(Dwarf_Die *vr_die, struct probe_finder *pf)
&die_mem);
vr_die = &die_mem;
}
if (ret == 0) {
if (pf->pvar->type) {
pf->tvar->type = strdup(pf->pvar->type);
if (pf->tvar->type == NULL)
ret = -ENOMEM;
} else
ret = convert_variable_type(vr_die, pf->tvar);
}
if (ret == 0)
ret = convert_variable_type(vr_die, pf->tvar, pf->pvar->type);
/* *expr will be cached in libdw. Don't free it. */
return ret;
error: