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e56fbc9dc7
To allow for destructors to check if they're operating on a object still in a list, and to avoid going from use after free list entries into still valid, or even also other already removed from list entries. Cc: Adrian Hunter <adrian.hunter@intel.com> Cc: Jiri Olsa <jolsa@kernel.org> Cc: Namhyung Kim <namhyung@kernel.org> Link: https://lkml.kernel.org/n/tip-deh17ub44atyox3j90e6rksu@git.kernel.org Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
114 lines
2.5 KiB
C
114 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* call-path.h: Manipulate a tree data structure containing function call paths
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* Copyright (c) 2014, Intel Corporation.
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*/
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#include <linux/rbtree.h>
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#include <linux/list.h>
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#include <linux/zalloc.h>
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#include <stdlib.h>
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#include "call-path.h"
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static void call_path__init(struct call_path *cp, struct call_path *parent,
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struct symbol *sym, u64 ip, bool in_kernel)
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{
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cp->parent = parent;
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cp->sym = sym;
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cp->ip = sym ? 0 : ip;
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cp->db_id = 0;
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cp->in_kernel = in_kernel;
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RB_CLEAR_NODE(&cp->rb_node);
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cp->children = RB_ROOT;
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}
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struct call_path_root *call_path_root__new(void)
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{
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struct call_path_root *cpr;
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cpr = zalloc(sizeof(struct call_path_root));
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if (!cpr)
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return NULL;
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call_path__init(&cpr->call_path, NULL, NULL, 0, false);
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INIT_LIST_HEAD(&cpr->blocks);
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return cpr;
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}
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void call_path_root__free(struct call_path_root *cpr)
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{
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struct call_path_block *pos, *n;
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list_for_each_entry_safe(pos, n, &cpr->blocks, node) {
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list_del_init(&pos->node);
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free(pos);
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}
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free(cpr);
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}
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static struct call_path *call_path__new(struct call_path_root *cpr,
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struct call_path *parent,
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struct symbol *sym, u64 ip,
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bool in_kernel)
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{
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struct call_path_block *cpb;
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struct call_path *cp;
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size_t n;
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if (cpr->next < cpr->sz) {
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cpb = list_last_entry(&cpr->blocks, struct call_path_block,
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node);
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} else {
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cpb = zalloc(sizeof(struct call_path_block));
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if (!cpb)
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return NULL;
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list_add_tail(&cpb->node, &cpr->blocks);
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cpr->sz += CALL_PATH_BLOCK_SIZE;
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}
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n = cpr->next++ & CALL_PATH_BLOCK_MASK;
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cp = &cpb->cp[n];
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call_path__init(cp, parent, sym, ip, in_kernel);
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return cp;
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}
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struct call_path *call_path__findnew(struct call_path_root *cpr,
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struct call_path *parent,
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struct symbol *sym, u64 ip, u64 ks)
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{
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struct rb_node **p;
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struct rb_node *node_parent = NULL;
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struct call_path *cp;
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bool in_kernel = ip >= ks;
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if (sym)
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ip = 0;
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if (!parent)
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return call_path__new(cpr, parent, sym, ip, in_kernel);
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p = &parent->children.rb_node;
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while (*p != NULL) {
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node_parent = *p;
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cp = rb_entry(node_parent, struct call_path, rb_node);
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if (cp->sym == sym && cp->ip == ip)
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return cp;
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if (sym < cp->sym || (sym == cp->sym && ip < cp->ip))
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p = &(*p)->rb_left;
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else
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p = &(*p)->rb_right;
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}
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cp = call_path__new(cpr, parent, sym, ip, in_kernel);
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if (!cp)
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return NULL;
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rb_link_node(&cp->rb_node, node_parent, p);
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rb_insert_color(&cp->rb_node, &parent->children);
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return cp;
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}
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