From 336ea18ad7f48d675fce8c97bf3b7a0ee3a5a450 Mon Sep 17 00:00:00 2001
From: Sebastian Huber <sebastian.huber@embedded-brains.de>
Date: Wed, 23 Mar 2022 10:20:56 +0100
Subject: [PATCH] gcov-tool: Allow merging of empty profile lists
The gcov_profile_merge() already had code to deal with profile information
which had no counterpart to merge with. For profile information from files
with no associated counterpart, the profile information is simply used as is
with the weighting transformation applied. Make sure that gcov_profile_merge()
works with an empty target profile list. Return the merged profile list.
gcc/
* gcov-tool.cc (gcov_profile_merge): Adjust return type.
(profile_merge): Allow merging of directories which contain no profile
files.
libgcc/
* libgcov-util.c (gcov_profile_merge): Return the list of merged
profiles. Accept empty target and source profile lists.
---
gcc/gcov-tool.cc | 27 ++++++++++-----------------
libgcc/libgcov-util.c | 19 +++++++++++--------
2 files changed, 21 insertions(+), 25 deletions(-)
diff --git a/gcc/gcov-tool.cc b/gcc/gcov-tool.cc
index f4e42ae763c7..2e4083a664d0 100644
--- a/gcc/gcov-tool.cc
+++ b/gcc/gcov-tool.cc
@@ -40,7 +40,8 @@ see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
#endif
#include <getopt.h>
-extern int gcov_profile_merge (struct gcov_info*, struct gcov_info*, int, int);
+extern struct gcov_info *gcov_profile_merge (struct gcov_info*,
+ struct gcov_info*, int, int);
extern int gcov_profile_overlap (struct gcov_info*, struct gcov_info*);
extern int gcov_profile_normalize (struct gcov_info*, gcov_type);
extern int gcov_profile_scale (struct gcov_info*, float, int, int);
@@ -141,26 +142,18 @@ profile_merge (const char *d1, const char *d2, const char *out, int w1, int w2)
{
struct gcov_info *d1_profile;
struct gcov_info *d2_profile;
- int ret;
+ struct gcov_info *merged_profile;
d1_profile = gcov_read_profile_dir (d1, 0);
- if (!d1_profile)
- return 1;
-
- if (d2)
- {
- d2_profile = gcov_read_profile_dir (d2, 0);
- if (!d2_profile)
- return 1;
+ d2_profile = gcov_read_profile_dir (d2, 0);
- /* The actual merge: we overwrite to d1_profile. */
- ret = gcov_profile_merge (d1_profile, d2_profile, w1, w2);
+ /* The actual merge: we overwrite to d1_profile. */
+ merged_profile = gcov_profile_merge (d1_profile, d2_profile, w1, w2);
- if (ret)
- return ret;
- }
-
- gcov_output_files (out, d1_profile);
+ if (merged_profile)
+ gcov_output_files (out, merged_profile);
+ else if (verbose)
+ fnotice (stdout, "no profile files were merged\n");
return 0;
}
diff --git a/libgcc/libgcov-util.c b/libgcc/libgcov-util.c
index ba7fb924b530..100f1b19f1a2 100644
--- a/libgcc/libgcov-util.c
+++ b/libgcc/libgcov-util.c
@@ -674,16 +674,16 @@ find_match_gcov_info (struct gcov_info **array, int size,
}
/* Merge the list of gcov_info objects from SRC_PROFILE to TGT_PROFILE.
- Return 0 on success: without mismatch.
- Reutrn 1 on error. */
+ Return the list of merged gcov_info objects. Return NULL if the list is
+ empty. */
-int
+struct gcov_info *
gcov_profile_merge (struct gcov_info *tgt_profile, struct gcov_info *src_profile,
int w1, int w2)
{
struct gcov_info *gi_ptr;
struct gcov_info **tgt_infos;
- struct gcov_info *tgt_tail;
+ struct gcov_info **tgt_tail;
struct gcov_info **in_src_not_tgt;
unsigned tgt_cnt = 0, src_cnt = 0;
unsigned unmatch_info_cnt = 0;
@@ -703,7 +703,10 @@ gcov_profile_merge (struct gcov_info *tgt_profile, struct gcov_info *src_profile
for (gi_ptr = tgt_profile, i = 0; gi_ptr; gi_ptr = gi_ptr->next, i++)
tgt_infos[i] = gi_ptr;
- tgt_tail = tgt_infos[tgt_cnt - 1];
+ if (tgt_cnt)
+ tgt_tail = &tgt_infos[tgt_cnt - 1]->next;
+ else
+ tgt_tail = &tgt_profile;
/* First pass on tgt_profile, we multiply w1 to all counters. */
if (w1 > 1)
@@ -732,14 +735,14 @@ gcov_profile_merge (struct gcov_info *tgt_profile, struct gcov_info *src_profile
gi_ptr = in_src_not_tgt[i];
gcov_merge (gi_ptr, gi_ptr, w2 - 1);
gi_ptr->next = NULL;
- tgt_tail->next = gi_ptr;
- tgt_tail = gi_ptr;
+ *tgt_tail = gi_ptr;
+ tgt_tail = &gi_ptr->next;
}
free (in_src_not_tgt);
free (tgt_infos);
- return 0;
+ return tgt_profile;
}
typedef gcov_type (*counter_op_fn) (gcov_type, void*, void*);
--
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