// SPDX-License-Identifier: GPL-2.0/* * Copyright (C) 2024 Google LLC */ #include <string.h>#include "gendwarfksyms.h" #define DIE_HASH_BITS 16 /* {die->addr, state} -> struct die * */static HASHTABLE_DEFINE(die_map, 1 << DIE_HASH_BITS); static unsigned int map_hits;static unsigned int map_misses; static inline unsigned int die_hash(uintptr_t addr, enum die_state state){	return hash_32(addr_hash(addr) ^ (unsigned int)state);} static void init_die(struct die *cd){	cd->state = DIE_INCOMPLETE;	cd->mapped = false;	cd->fqn = NULL;	cd->tag = -1;	cd->addr = 0;	INIT_LIST_HEAD(&cd->fragments);} static struct die *create_die(Dwarf_Die *die, enum die_state state){	struct die *cd; 	cd = xmalloc(sizeof(*cd));	init_die(cd);	cd->addr = (uintptr_t)die->addr; 	hash_add(die_map, &cd->hash, die_hash(cd->addr, state));	return cd;} int __die_map_get(uintptr_t addr, enum die_state state, struct die **res){	struct die *cd; 	hash_for_each_possible(die_map, cd, hash, die_hash(addr, state)) {		if (cd->addr == addr && cd->state == state) {			*res = cd;			return 0;		}	} 	return -1;} struct die *die_map_get(Dwarf_Die *die, enum die_state state){	struct die *cd; 	if (__die_map_get((uintptr_t)die->addr, state, &cd) == 0) {		map_hits++;		return cd;	} 	map_misses++;	return create_die(die, state);} static void reset_die(struct die *cd){	struct die_fragment *tmp;	struct die_fragment *df; 	list_for_each_entry_safe(df, tmp, &cd->fragments, list) {		if (df->type == FRAGMENT_STRING)			free(df->data.str);		free(df);	} 	if (cd->fqn && *cd->fqn)		free(cd->fqn);	init_die(cd);} void die_map_for_each(die_map_callback_t func, void *arg){	struct hlist_node *tmp;	struct die *cd; 	hash_for_each_safe(die_map, cd, tmp, hash) {		func(cd, arg);	}} void die_map_free(void){	struct hlist_node *tmp;	unsigned int stats[DIE_LAST + 1];	struct die *cd;	int i; 	memset(stats, 0, sizeof(stats)); 	hash_for_each_safe(die_map, cd, tmp, hash) {		stats[cd->state]++;		reset_die(cd);		free(cd);	}	hash_init(die_map); 	if (map_hits + map_misses > 0)		debug("hits %u, misses %u (hit rate %.02f%%)", map_hits,		      map_misses,		      (100.0f * map_hits) / (map_hits + map_misses)); 	for (i = 0; i <= DIE_LAST; i++)		debug("%s: %u entries", die_state_name(i), stats[i]);} static struct die_fragment *append_item(struct die *cd){	struct die_fragment *df; 	df = xmalloc(sizeof(*df));	df->type = FRAGMENT_EMPTY;	list_add_tail(&df->list, &cd->fragments);	return df;} void die_map_add_string(struct die *cd, const char *str){	struct die_fragment *df; 	if (!cd)		return; 	df = append_item(cd);	df->data.str = xstrdup(str);	df->type = FRAGMENT_STRING;} void die_map_add_linebreak(struct die *cd, int linebreak){	struct die_fragment *df; 	if (!cd)		return; 	df = append_item(cd);	df->data.linebreak = linebreak;	df->type = FRAGMENT_LINEBREAK;} void die_map_add_die(struct die *cd, struct die *child){	struct die_fragment *df; 	if (!cd)		return; 	df = append_item(cd);	df->data.addr = child->addr;	df->type = FRAGMENT_DIE;}