// SPDX-License-Identifier: GPL-2.0-only/* * call-path.h: Manipulate a tree data structure containing function call paths * Copyright (c) 2014, Intel Corporation. */ #include <linux/rbtree.h>#include <linux/list.h>#include <linux/zalloc.h>#include <stdlib.h> #include "call-path.h" static void call_path__init(struct call_path *cp, struct call_path *parent,			    struct symbol *sym, u64 ip, bool in_kernel){	cp->parent = parent;	cp->sym = sym;	cp->ip = sym ? 0 : ip;	cp->db_id = 0;	cp->in_kernel = in_kernel;	RB_CLEAR_NODE(&cp->rb_node);	cp->children = RB_ROOT;} struct call_path_root *call_path_root__new(void){	struct call_path_root *cpr; 	cpr = zalloc(sizeof(struct call_path_root));	if (!cpr)		return NULL;	call_path__init(&cpr->call_path, NULL, NULL, 0, false);	INIT_LIST_HEAD(&cpr->blocks);	return cpr;} void call_path_root__free(struct call_path_root *cpr){	struct call_path_block *pos, *n; 	list_for_each_entry_safe(pos, n, &cpr->blocks, node) {		list_del_init(&pos->node);		free(pos);	}	free(cpr);} static struct call_path *call_path__new(struct call_path_root *cpr,					struct call_path *parent,					struct symbol *sym, u64 ip,					bool in_kernel){	struct call_path_block *cpb;	struct call_path *cp;	size_t n; 	if (cpr->next < cpr->sz) {		cpb = list_last_entry(&cpr->blocks, struct call_path_block,				      node);	} else {		cpb = zalloc(sizeof(struct call_path_block));		if (!cpb)			return NULL;		list_add_tail(&cpb->node, &cpr->blocks);		cpr->sz += CALL_PATH_BLOCK_SIZE;	} 	n = cpr->next++ & CALL_PATH_BLOCK_MASK;	cp = &cpb->cp[n]; 	call_path__init(cp, parent, sym, ip, in_kernel); 	return cp;} struct call_path *call_path__findnew(struct call_path_root *cpr,				     struct call_path *parent,				     struct symbol *sym, u64 ip, u64 ks){	struct rb_node **p;	struct rb_node *node_parent = NULL;	struct call_path *cp;	bool in_kernel = ip >= ks; 	if (sym)		ip = 0; 	if (!parent)		return call_path__new(cpr, parent, sym, ip, in_kernel); 	p = &parent->children.rb_node;	while (*p != NULL) {		node_parent = *p;		cp = rb_entry(node_parent, struct call_path, rb_node); 		if (cp->sym == sym && cp->ip == ip)			return cp; 		if (sym < cp->sym || (sym == cp->sym && ip < cp->ip))			p = &(*p)->rb_left;		else			p = &(*p)->rb_right;	} 	cp = call_path__new(cpr, parent, sym, ip, in_kernel);	if (!cp)		return NULL; 	rb_link_node(&cp->rb_node, node_parent, p);	rb_insert_color(&cp->rb_node, &parent->children); 	return cp;}