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/* Only possible if we're in developer mode. */
#if DEVELOPER
#include <backtrace.h>
#include <ccan/tal/str/str.h>
#include <common/memleak.h>
#include <lightningd/chaintopology.h>
#include <lightningd/jsonrpc.h>
#include <lightningd/lightningd.h>
#include <lightningd/log.h>
#include <stdio.h>
static void json_add_ptr(struct json_result *response, const char *name,
const void *ptr)
{
char ptrstr[STR_MAX_CHARS(void *)];
sprintf(ptrstr, "%p", ptr);
json_add_string(response, name, ptrstr);
}
static void add_memdump(struct json_result *response,
const char *name, const tal_t *root,
struct command *cmd)
{
const tal_t *i;
json_array_start(response, name);
for (i = tal_first(root); i; i = tal_next(i)) {
const char *name = tal_name(i);
/* Don't try to dump this command! */
if (i == cmd || i == cmd->jcon)
continue;
/* Don't dump logs, we know they grow. */
if (name && streq(name, "struct log_book"))
continue;
json_object_start(response, NULL);
json_add_ptr(response, "parent", tal_parent(i));
json_add_ptr(response, "value", i);
if (name)
json_add_string(response, "label", name);
if (tal_first(i))
add_memdump(response, "children", i, cmd);
json_object_end(response);
}
json_array_end(response);
}
static void json_memdump(struct command *cmd,
const char *buffer UNNEEDED,
const jsmntok_t *params UNNEEDED)
{
struct json_result *response = new_json_result(cmd);
add_memdump(response, NULL, NULL, cmd);
command_success(cmd, response);
}
static const struct json_command dev_memdump_command = {
"dev-memdump",
json_memdump,
"Dump the memory objects currently used",
"Debugging tool for memory leaks"
};
AUTODATA(json_command, &dev_memdump_command);
static int json_add_syminfo(void *data, uintptr_t pc,
const char *filename, int lineno,
const char *function)
{
struct json_result *response = data;
char *str;
str = tal_fmt(response, "%s:%u (%s)", filename, lineno, function);
json_add_string(response, NULL, str);
tal_free(str);
return 0;
}
static void json_add_backtrace(struct json_result *response,
const uintptr_t *bt)
{
size_t i;
if (!bt)
return;
json_array_start(response, "backtrace");
/* First one serves as counter. */
for (i = 1; i < bt[0]; i++) {
backtrace_pcinfo(backtrace_state,
bt[i], json_add_syminfo,
NULL, response);
}
json_array_end(response);
}
static void scan_mem(struct command *cmd,
struct json_result *response,
struct lightningd *ld)
{
struct htable *memtable;
const tal_t *i;
const uintptr_t *backtrace;
/* Enter everything, except this cmd and its jcon */
memtable = memleak_enter_allocations(cmd, cmd, cmd->jcon);
/* First delete known false positives. */
chaintopology_mark_pointers_used(memtable, ld->topology);
htlc_inmap_mark_pointers_used(memtable, &ld->htlcs_in);
htlc_outmap_mark_pointers_used(memtable, &ld->htlcs_out);
/* Now delete ld and those which it has pointers to. */
memleak_remove_referenced(memtable, ld);
json_array_start(response, "leaks");
while ((i = memleak_get(memtable, &backtrace)) != NULL) {
const tal_t *p;
json_object_start(response, NULL);
json_add_ptr(response, "value", i);
if (tal_name(i))
json_add_string(response, "label", tal_name(i));
json_add_backtrace(response, backtrace);
json_array_start(response, "parents");
for (p = tal_parent(i); p; p = tal_parent(p)) {
json_add_string(response, NULL, tal_name(p));
p = tal_parent(p);
}
json_array_end(response);
json_object_end(response);
}
json_array_end(response);
}
static void json_memleak(struct command *cmd,
const char *buffer UNNEEDED,
const jsmntok_t *params UNNEEDED)
{
struct json_result *response = new_json_result(cmd);
if (!getenv("LIGHTNINGD_DEV_MEMLEAK")) {
command_fail(cmd,
"Leak detection needs $LIGHTNINGD_DEV_MEMLEAK");
return;
}
json_object_start(response, NULL);
scan_mem(cmd, response, cmd->ld);
json_object_end(response);
command_success(cmd, response);
}
static const struct json_command dev_memleak_command = {
"dev-memleak",
json_memleak,
"Dump the memory objects unreferenced",
"Debugging tool for memory leaks"
};
AUTODATA(json_command, &dev_memleak_command);
#endif /* DEVELOPER */