static int find_variable(Dwarf_Die *sc_die, struct probe_finder *pf)
{
Dwarf_Die vr_die;
char buf[32], *ptr;
int ret = 0;
if (!is_c_varname(pf->pvar->var)) {
pf->tvar->value = strdup(pf->pvar->var);
if (pf->tvar->value == NULL)
return -ENOMEM;
if (pf->pvar->type) {
pf->tvar->type = strdup(pf->pvar->type);
if (pf->tvar->type == NULL)
return -ENOMEM;
}
if (pf->pvar->name) {
pf->tvar->name = strdup(pf->pvar->name);
if (pf->tvar->name == NULL)
return -ENOMEM;
} else
pf->tvar->name = NULL;
return 0;
}
if (pf->pvar->name)
pf->tvar->name = strdup(pf->pvar->name);
else {
ret = synthesize_perf_probe_arg(pf->pvar, buf, 32);
if (ret < 0)
return ret;
ptr = strchr(buf, ':');
if (ptr)
*ptr = '_';
pf->tvar->name = strdup(buf);
}
if (pf->tvar->name == NULL)
return -ENOMEM;
pr_debug("Searching '%s' variable in context.\n", pf->pvar->var);
if (!die_find_variable_at(sc_die, pf->pvar->var, pf->addr, &vr_die)) {
if (!die_find_variable_at(&pf->cu_die, pf->pvar->var, 0, &vr_die))
ret = -ENOENT;
}
if (ret >= 0)
ret = convert_variable(&vr_die, pf);
if (ret < 0)
pr_warning("Failed to find '%s' in this function.\n",
pf->pvar->var);
return ret;
}
/* Find a variable in a subprogram die */
static int find_variable(Dwarf_Die *sp_die, struct probe_finder *pf)
{
Dwarf_Die vr_die, *scopes;
char buf[32], *ptr;
int ret, nscopes;
if (!is_c_varname(pf->pvar->var)) {
/* Copy raw parameters */
pf->tvar->value = strdup(pf->pvar->var);
if (pf->tvar->value == NULL)
return -ENOMEM;
if (pf->pvar->type) {
pf->tvar->type = strdup(pf->pvar->type);
if (pf->tvar->type == NULL)
return -ENOMEM;
}
if (pf->pvar->name) {
pf->tvar->name = strdup(pf->pvar->name);
if (pf->tvar->name == NULL)
return -ENOMEM;
} else
pf->tvar->name = NULL;
return 0;
}
if (pf->pvar->name)
pf->tvar->name = strdup(pf->pvar->name);
else {
ret = synthesize_perf_probe_arg(pf->pvar, buf, 32);
if (ret < 0)
return ret;
ptr = strchr(buf, ':'); /* Change type separator to _ */
if (ptr)
*ptr = '_';
pf->tvar->name = strdup(buf);
}
if (pf->tvar->name == NULL)
return -ENOMEM;
pr_debug("Searching '%s' variable in context.\n",
pf->pvar->var);
/* Search child die for local variables and parameters. */
if (die_find_variable_at(sp_die, pf->pvar->var, pf->addr, &vr_die))
ret = convert_variable(&vr_die, pf);
else {
/* Search upper class */
nscopes = dwarf_getscopes_die(sp_die, &scopes);
while (nscopes-- > 1) {
pr_debug("Searching variables in %s\n",
dwarf_diename(&scopes[nscopes]));
/* We should check this scope, so give dummy address */
if (die_find_variable_at(&scopes[nscopes],
pf->pvar->var, 0,
&vr_die)) {
ret = convert_variable(&vr_die, pf);
goto found;
}
}
if (scopes)
free(scopes);
ret = -ENOENT;
}
found:
if (ret < 0)
pr_warning("Failed to find '%s' in this function.\n",
pf->pvar->var);
return ret;
}