1 files changed, 237 insertions, 105 deletions

diff --git a/tools/perf/util/header.c b/tools/perf/util/header.c
index 7d26659b806c..b01a9537977f 100644
--- a/tools/perf/util/header.c
+++ b/tools/perf/util/header.c
@@ -2,11 +2,15 @@
 #include <unistd.h>
 #include <stdio.h>
 #include <stdlib.h>
+#include <linux/list.h>
 
 #include "util.h"
 #include "header.h"
 #include "../perf.h"
 #include "trace-event.h"
+#include "symbol.h"
+#include "data_map.h"
+#include "debug.h"
 
 /*
  * Create new perf.data header attribute:
@@ -15,32 +19,43 @@ struct perf_header_attr *perf_header_attr__new(struct perf_event_attr *attr)
 {
 	struct perf_header_attr *self = malloc(sizeof(*self));
 
-	if (!self)
-		die("nomem");
-
-	self->attr = *attr;
-	self->ids = 0;
-	self->size = 1;
-	self->id = malloc(sizeof(u64));
-
-	if (!self->id)
-		die("nomem");
+	if (self != NULL) {
+		self->attr = *attr;
+		self->ids  = 0;
+		self->size = 1;
+		self->id   = malloc(sizeof(u64));
+		if (self->id == NULL) {
+			free(self);
+			self = NULL;
+		}
+	}
 
 	return self;
 }
 
-void perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
+void perf_header_attr__delete(struct perf_header_attr *self)
+{
+	free(self->id);
+	free(self);
+}
+
+int perf_header_attr__add_id(struct perf_header_attr *self, u64 id)
 {
 	int pos = self->ids;
 
 	self->ids++;
 	if (self->ids > self->size) {
-		self->size *= 2;
-		self->id = realloc(self->id, self->size * sizeof(u64));
-		if (!self->id)
-			die("nomem");
+		int nsize = self->size * 2;
+		u64 *nid = realloc(self->id, nsize * sizeof(u64));
+
+		if (nid == NULL)
+			return -1;
+
+		self->size = nsize;
+		self->id = nid;
 	}
 	self->id[pos] = id;
+	return 0;
 }
 
 /*
@@ -50,34 +65,41 @@ struct perf_header *perf_header__new(void)
 {
 	struct perf_header *self = calloc(sizeof(*self), 1);
 
-	if (!self)
-		die("nomem");
-
-	self->size = 1;
-	self->attr = malloc(sizeof(void *));
+	if (self != NULL) {
+		self->size = 1;
+		self->attr = malloc(sizeof(void *));
 
-	if (!self->attr)
-		die("nomem");
+		if (self->attr == NULL) {
+			free(self);
+			self = NULL;
+		}
+	}
 
 	return self;
 }
 
-void perf_header__add_attr(struct perf_header *self,
-			   struct perf_header_attr *attr)
+int perf_header__add_attr(struct perf_header *self,
+			  struct perf_header_attr *attr)
 {
 	int pos = self->attrs;
 
 	if (self->frozen)
-		die("frozen");
+		return -1;
 
 	self->attrs++;
 	if (self->attrs > self->size) {
-		self->size *= 2;
-		self->attr = realloc(self->attr, self->size * sizeof(void *));
-		if (!self->attr)
-			die("nomem");
+		int nsize = self->size * 2;
+		struct perf_header_attr **nattr;
+
+		nattr = realloc(self->attr, nsize * sizeof(void *));
+		if (nattr == NULL)
+			return -1;
+
+		self->size = nsize;
+		self->attr = nattr;
 	}
 	self->attr[pos] = attr;
+	return 0;
 }
 
 #define MAX_EVENT_NAME 64
@@ -124,71 +146,110 @@ static const char *__perf_magic = "PERFFILE";
 
 #define PERF_MAGIC	(*(u64 *)__perf_magic)
 
-struct perf_file_section {
-	u64 offset;
-	u64 size;
-};
-
 struct perf_file_attr {
 	struct perf_event_attr	attr;
 	struct perf_file_section	ids;
 };
 
-struct perf_file_header {
-	u64				magic;
-	u64				size;
-	u64				attr_size;
-	struct perf_file_section	attrs;
-	struct perf_file_section	data;
-	struct perf_file_section	event_types;
-	DECLARE_BITMAP(adds_features, HEADER_FEAT_BITS);
-};
+void perf_header__set_feat(struct perf_header *self, int feat)
+{
+	set_bit(feat, self->adds_features);
+}
 
-void perf_header__feat_trace_info(struct perf_header *header)
+bool perf_header__has_feat(const struct perf_header *self, int feat)
 {
-	set_bit(HEADER_TRACE_INFO, header->adds_features);
+	return test_bit(feat, self->adds_features);
 }
 
-static void do_write(int fd, void *buf, size_t size)
+static int do_write(int fd, const void *buf, size_t size)
 {
 	while (size) {
 		int ret = write(fd, buf, size);
 
 		if (ret < 0)
-			die("failed to write");
+			return -1;
 
 		size -= ret;
 		buf += ret;
 	}
+
+	return 0;
+}
+
+static int write_buildid_table(int fd, struct list_head *id_head)
+{
+	struct build_id_list *iter, *next;
+
+	list_for_each_entry_safe(iter, next, id_head, list) {
+		struct build_id_event *b = &iter->event;
+
+		if (do_write(fd, b, sizeof(*b)) < 0 ||
+		    do_write(fd, iter->dso_name, iter->len) < 0)
+			return -1;
+		list_del(&iter->list);
+		free(iter);
+	}
+
+	return 0;
 }
 
-static void perf_header__adds_write(struct perf_header *self, int fd)
+static void
+perf_header__adds_write(struct perf_header *self, int fd)
 {
-	struct perf_file_section trace_sec;
-	u64 cur_offset = lseek(fd, 0, SEEK_CUR);
-	unsigned long *feat_mask = self->adds_features;
+	LIST_HEAD(id_list);
+	int nr_sections;
+	struct perf_file_section *feat_sec;
+	int sec_size;
+	u64 sec_start;
+	int idx = 0;
+
+	if (fetch_build_id_table(&id_list))
+		perf_header__set_feat(self, HEADER_BUILD_ID);
+
+	nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
+	if (!nr_sections)
+		return;
+
+	feat_sec = calloc(sizeof(*feat_sec), nr_sections);
+	if (!feat_sec)
+		die("No memory");
+
+	sec_size = sizeof(*feat_sec) * nr_sections;
+
+	sec_start = self->data_offset + self->data_size;
+	lseek(fd, sec_start + sec_size, SEEK_SET);
+
+	if (perf_header__has_feat(self, HEADER_TRACE_INFO)) {
+		struct perf_file_section *trace_sec;
+
+		trace_sec = &feat_sec[idx++];
 
-	if (test_bit(HEADER_TRACE_INFO, feat_mask)) {
 		/* Write trace info */
-		trace_sec.offset = lseek(fd, sizeof(trace_sec), SEEK_CUR);
+		trace_sec->offset = lseek(fd, 0, SEEK_CUR);
 		read_tracing_data(fd, attrs, nr_counters);
-		trace_sec.size = lseek(fd, 0, SEEK_CUR) - trace_sec.offset;
-
-		/* Write trace info headers */
-		lseek(fd, cur_offset, SEEK_SET);
-		do_write(fd, &trace_sec, sizeof(trace_sec));
-
-		/*
-		 * Update cur_offset. So that other (future)
-		 * features can set their own infos in this place. But if we are
-		 * the only feature, at least that seeks to the place the data
-		 * should begin.
-		 */
-		cur_offset = lseek(fd, trace_sec.offset + trace_sec.size, SEEK_SET);
+		trace_sec->size = lseek(fd, 0, SEEK_CUR) - trace_sec->offset;
 	}
-};
 
-void perf_header__write(struct perf_header *self, int fd)
+
+	if (perf_header__has_feat(self, HEADER_BUILD_ID)) {
+		struct perf_file_section *buildid_sec;
+
+		buildid_sec = &feat_sec[idx++];
+
+		/* Write build-ids */
+		buildid_sec->offset = lseek(fd, 0, SEEK_CUR);
+		if (write_buildid_table(fd, &id_list) < 0)
+			die("failed to write buildid table");
+		buildid_sec->size = lseek(fd, 0, SEEK_CUR) - buildid_sec->offset;
+	}
+
+	lseek(fd, sec_start, SEEK_SET);
+	if (do_write(fd, feat_sec, sec_size) < 0)
+		die("failed to write feature section");
+	free(feat_sec);
+}
+
+void perf_header__write(struct perf_header *self, int fd, bool at_exit)
 {
 	struct perf_file_header f_header;
 	struct perf_file_attr   f_attr;
@@ -202,7 +263,8 @@ void perf_header__write(struct perf_header *self, int fd)
 		attr = self->attr[i];
 
 		attr->id_offset = lseek(fd, 0, SEEK_CUR);
-		do_write(fd, attr->id, attr->ids * sizeof(u64));
+		if (do_write(fd, attr->id, attr->ids * sizeof(u64)) < 0)
+			die("failed to write perf header");
 	}
 
 
@@ -218,18 +280,21 @@ void perf_header__write(struct perf_header *self, int fd)
 				.size   = attr->ids * sizeof(u64),
 			}
 		};
-		do_write(fd, &f_attr, sizeof(f_attr));
+		if (do_write(fd, &f_attr, sizeof(f_attr)) < 0)
+			die("failed to write perf header attribute");
 	}
 
 	self->event_offset = lseek(fd, 0, SEEK_CUR);
 	self->event_size = event_count * sizeof(struct perf_trace_event_type);
 	if (events)
-		do_write(fd, events, self->event_size);
-
-	perf_header__adds_write(self, fd);
+		if (do_write(fd, events, self->event_size) < 0)
+			die("failed to write perf header events");
 
 	self->data_offset = lseek(fd, 0, SEEK_CUR);
 
+	if (at_exit)
+		perf_header__adds_write(self, fd);
+
 	f_header = (struct perf_file_header){
 		.magic	   = PERF_MAGIC,
 		.size	   = sizeof(f_header),
@@ -251,7 +316,8 @@ void perf_header__write(struct perf_header *self, int fd)
 	memcpy(&f_header.adds_features, &self->adds_features, sizeof(self->adds_features));
 
 	lseek(fd, 0, SEEK_SET);
-	do_write(fd, &f_header, sizeof(f_header));
+	if (do_write(fd, &f_header, sizeof(f_header)) < 0)
+		die("failed to write perf header");
 	lseek(fd, self->data_offset + self->data_size, SEEK_SET);
 
 	self->frozen = 1;
@@ -272,43 +338,112 @@ static void do_read(int fd, void *buf, size_t size)
 	}
 }
 
-static void perf_header__adds_read(struct perf_header *self, int fd)
+int perf_header__process_sections(struct perf_header *self, int fd,
+				  int (*process)(struct perf_file_section *self,
+						 int feat, int fd))
 {
-	const unsigned long *feat_mask = self->adds_features;
+	struct perf_file_section *feat_sec;
+	int nr_sections;
+	int sec_size;
+	int idx = 0;
+	int err = 0, feat = 1;
 
-	if (test_bit(HEADER_TRACE_INFO, feat_mask)) {
-		struct perf_file_section trace_sec;
+	nr_sections = bitmap_weight(self->adds_features, HEADER_FEAT_BITS);
+	if (!nr_sections)
+		return 0;
 
-		do_read(fd, &trace_sec, sizeof(trace_sec));
-		lseek(fd, trace_sec.offset, SEEK_SET);
-		trace_report(fd);
-		lseek(fd, trace_sec.offset + trace_sec.size, SEEK_SET);
+	feat_sec = calloc(sizeof(*feat_sec), nr_sections);
+	if (!feat_sec)
+		return -1;
+
+	sec_size = sizeof(*feat_sec) * nr_sections;
+
+	lseek(fd, self->data_offset + self->data_size, SEEK_SET);
+
+	do_read(fd, feat_sec, sec_size);
+
+	while (idx < nr_sections && feat < HEADER_LAST_FEATURE) {
+		if (perf_header__has_feat(self, feat)) {
+			struct perf_file_section *sec = &feat_sec[idx++];
+
+			err = process(sec, feat, fd);
+			if (err < 0)
+				break;
+		}
+		++feat;
 	}
+
+	free(feat_sec);
+	return err;
 };
 
+int perf_file_header__read(struct perf_file_header *self,
+			   struct perf_header *ph, int fd)
+{
+	lseek(fd, 0, SEEK_SET);
+	do_read(fd, self, sizeof(*self));
+
+	if (self->magic     != PERF_MAGIC ||
+	    self->attr_size != sizeof(struct perf_file_attr))
+		return -1;
+
+	if (self->size != sizeof(*self)) {
+		/* Support the previous format */
+		if (self->size == offsetof(typeof(*self), adds_features))
+			bitmap_zero(self->adds_features, HEADER_FEAT_BITS);
+		else
+			return -1;
+	}
+
+	memcpy(&ph->adds_features, &self->adds_features,
+	       sizeof(self->adds_features));
+
+	ph->event_offset = self->event_types.offset;
+	ph->event_size	 = self->event_types.size;
+	ph->data_offset	 = self->data.offset;
+	ph->data_size	 = self->data.size;
+	return 0;
+}
+
+static int perf_file_section__process(struct perf_file_section *self,
+				      int feat, int fd)
+{
+	if (lseek(fd, self->offset, SEEK_SET) < 0) {
+		pr_debug("Failed to lseek to %Ld offset for feature %d, "
+			 "continuing...\n", self->offset, feat);
+		return 0;
+	}
+
+	switch (feat) {
+	case HEADER_TRACE_INFO:
+		trace_report(fd);
+		break;
+
+	case HEADER_BUILD_ID:
+		if (perf_header__read_build_ids(fd, self->offset, self->size))
+			pr_debug("Failed to read buildids, continuing...\n");
+		break;
+	default:
+		pr_debug("unknown feature %d, continuing...\n", feat);
+	}
+
+	return 0;
+}
+
 struct perf_header *perf_header__read(int fd)
 {
 	struct perf_header	*self = perf_header__new();
 	struct perf_file_header f_header;
 	struct perf_file_attr	f_attr;
 	u64			f_id;
-
 	int nr_attrs, nr_ids, i, j;
 
-	lseek(fd, 0, SEEK_SET);
-	do_read(fd, &f_header, sizeof(f_header));
+	if (self == NULL)
+		die("nomem");
 
-	if (f_header.magic	!= PERF_MAGIC		||
-	    f_header.attr_size	!= sizeof(f_attr))
+	if (perf_file_header__read(&f_header, self, fd) < 0)
 		die("incompatible file format");
 
-	if (f_header.size != sizeof(f_header)) {
-		/* Support the previous format */
-		if (f_header.size == offsetof(typeof(f_header), adds_features))
-			bitmap_zero(f_header.adds_features, HEADER_FEAT_BITS);
-		else
-			die("incompatible file format");
-	}
 	nr_attrs = f_header.attrs.size / sizeof(f_attr);
 	lseek(fd, f_header.attrs.offset, SEEK_SET);
 
@@ -320,6 +455,8 @@ struct perf_header *perf_header__read(int fd)
 		tmp = lseek(fd, 0, SEEK_CUR);
 
 		attr = perf_header_attr__new(&f_attr.attr);
+		if (attr == NULL)
+			 die("nomem");
 
 		nr_ids = f_attr.ids.size / sizeof(u64);
 		lseek(fd, f_attr.ids.offset, SEEK_SET);
@@ -327,9 +464,12 @@ struct perf_header *perf_header__read(int fd)
 		for (j = 0; j < nr_ids; j++) {
 			do_read(fd, &f_id, sizeof(f_id));
 
-			perf_header_attr__add_id(attr, f_id);
+			if (perf_header_attr__add_id(attr, f_id) < 0)
+				die("nomem");
 		}
-		perf_header__add_attr(self, attr);
+		if (perf_header__add_attr(self, attr) < 0)
+			 die("nomem");
+
 		lseek(fd, tmp, SEEK_SET);
 	}
 
@@ -342,15 +482,7 @@ struct perf_header *perf_header__read(int fd)
 		event_count =  f_header.event_types.size / sizeof(struct perf_trace_event_type);
 	}
 
-	memcpy(&self->adds_features, &f_header.adds_features, sizeof(f_header.adds_features));
-
-	perf_header__adds_read(self, fd);
-
-	self->event_offset = f_header.event_types.offset;
-	self->event_size   = f_header.event_types.size;
-
-	self->data_offset = f_header.data.offset;
-	self->data_size   = f_header.data.size;
+	perf_header__process_sections(self, fd, perf_file_section__process);
 
 	lseek(fd, self->data_offset, SEEK_SET);