path: root/tools/perf/util/map.c

#include "symbol.h"
#include <errno.h>
#include <inttypes.h>
#include <limits.h>
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
#include <unistd.h>
#include "map.h"
#include "thread.h"
#include "strlist.h"
#include "vdso.h"

const char *map_type__name[MAP__NR_TYPES] = {
	[MAP__FUNCTION] = "Functions",
	[MAP__VARIABLE] = "Variables",
};

static inline int is_anon_memory(const char *filename)
{
	return strcmp(filename, "//anon") == 0;
}

static inline int is_no_dso_memory(const char *filename)
{
	return !strcmp(filename, "[stack]") ||
	       !strcmp(filename, "[heap]");
}

void map__init(struct map *self, enum map_type type,
	       u64 start, u64 end, u64 pgoff, struct dso *dso)
{
	self->type     = type;
	self->start    = start;
	self->end      = end;
	self->pgoff    = pgoff;
	self->dso      = dso;
	self->map_ip   = map__map_ip;
	self->unmap_ip = map__unmap_ip;
	RB_CLEAR_NODE(&self->rb_node);
	self->groups   = NULL;
	self->referenced = false;
	self->erange_warned = false;
}

struct map *map__new(struct list_head *dsos__list, u64 start, u64 len,
		     u64 pgoff, u32 pid, char *filename,
		     enum map_type type)
{
	struct map *self = malloc(sizeof(*self));

	if (self != NULL) {
		char newfilename[PATH_MAX];
		struct dso *dso;
		int anon, no_dso, vdso;

		anon = is_anon_memory(filename);
		vdso = is_vdso_map(filename);
		no_dso = is_no_dso_memory(filename);

		if (anon) {
			snprintf(newfilename, sizeof(newfilename), "/tmp/perf-%d.map", pid);
			filename = newfilename;
		}

		if (vdso) {
			pgoff = 0;
			dso = vdso__dso_findnew(dsos__list);
		} else
			dso = __dsos__findnew(dsos__list, filename);

		if (dso == NULL)
			goto out_delete;

		map__init(self, type, start, start + len, pgoff, dso);

		if (anon || no_dso) {
			self->map_ip = self->unmap_ip = identity__map_ip;

			/*
			 * Set memory without DSO as loaded. All map__find_*
			 * functions still return NULL, and we avoid the
			 * unnecessary map__load warning.
			 */
			if (no_dso)
				dso__set_loaded(dso, self->type);
		}
	}
	return self;
out_delete:
	free(self);
	return NULL;
}

/*
 * Constructor variant for modules (where we know from /proc/modules where
 * they are loaded) and for vmlinux, where only after we load all the
 * symbols we'll know where it starts and ends.
 */
struct map *map__new2(u64 start, struct dso *dso, enum map_type type)
{
	struct map *map = calloc(1, (sizeof(*map) +
				     (dso->kernel ? sizeof(struct kmap) : 0)));
	if (map != NULL) {
		/*
		 * ->end will be filled after we load all the symbols
		 */
		map__init(map, type, start, 0, 0, dso);
	}

	return map;
}

void map__delete(struct map *self)
{
	free(self);
}

void map__fixup_start(struct map *self)
{
	struct rb_root *symbols = &self->dso->symbols[self->type];
	struct rb_node *nd = rb_first(symbols);
	if (nd != NULL) {
		struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
		self->start = sym->start;
	}
}

void map__fixup_end(struct map *self)
{
	struct rb_root *symbols = &self->dso->symbols[self->type];
	struct rb_node *nd = rb_last(symbols);
	if (nd != NULL) {
		struct symbol *sym = rb_entry(nd, struct symbol, rb_node);
		self->end = sym->end;
	}
}

#define DSO__DELETED "(deleted)"

int map__load(struct map *self, symbol_filter_t filter)
{
	const char *name = self->dso->long_name;
	int nr;

	if (dso__loaded(self->dso, self->type))
		return 0;

	nr = dso__load(self->dso, self, filter);
	if (nr < 0) {
		if (self->dso->has_build_id) {
			char sbuild_id[BUILD_ID_SIZE * 2 + 1];

			build_id__sprintf(self->dso->build_id,
					  sizeof(self->dso->build_id),
					  sbuild_id);
			pr_warning("%s with build id %s not found",
				   name, sbuild_id);
		} else
			pr_warning("Failed to open %s", name);

		pr_warning(", continuing without symbols\n");
		return -1;
	} else if (nr == 0) {
#ifdef LIBELF_SUPPORT
		const size_t len = strlen(name);
		const