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authorRamsay Jones <ramsay@ramsayjones.plus.com>2018-10-27 01:53:57 (GMT)
committerJunio C Hamano <gitster@pobox.com>2018-10-29 01:14:21 (GMT)
commit1406725b881900074a032e847e2d12a6a059d7e9 (patch)
tree49a1da668a9329f337fa0ec48c851f709a6a0e35 /commit-reach.h
parent3a457a08f2cb7d2b3a7279bf2340486eb65c41e0 (diff)
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commit-reach.h: add missing declarations (hdr-check)
Add the necessary #includes and forward declarations to allow the header file to pass the 'hdr-check' target. Note that, since this header includes the commit-slab implementation header file (indirectly via commit-slab.h), some of the commit-slab inline functions (e.g contains_cache_at_peek()) will not compile without the complete type of 'struct commit'. Hence, we replace the forward declaration of 'struct commit' with the an #include of the 'commit.h' header file. It is possible, using the 'commit-slab-{decl,impl}.h' files, to avoid this inclusion of the 'commit.h' header. Commit a9f1f1f9f8 ("commit-slab.h: code split", 2018-05-19) separated the commit-slab interface from its implementation, to allow for the definition of a public commit-slab data structure. This enabled us to avoid including the commit-slab implementation in a header file, which could result in the replication of the commit-slab functions in each compilation unit in which it was included. Indeed, if you compile with optimizations disabled, then run this script: $ cat -n dup-static.sh 1 #!/bin/sh 2 3 nm $1 | grep ' t ' | cut -d' ' -f3 | sort | uniq -c | 4 sort -rn | grep -v ' 1' $ $ ./dup-static.sh git | grep contains 24 init_contains_cache_with_stride 24 init_contains_cache 24 contains_cache_peek 24 contains_cache_at_peek 24 contains_cache_at 24 clear_contains_cache $ you will find 24 copies of the commit-slab routines for the contains_cache. Of course, when you enable optimizations again, these duplicate static functions (mostly) disappear. Compiling with gcc at -O2, leaves two static functions, thus: $ nm commit-reach.o | grep contains_cache 0000000000000870 t contains_cache_at_peek.isra.1.constprop.6 $ nm ref-filter.o | grep contains_cache 00000000000002b0 t clear_contains_cache.isra.14 $ However, using a shared 'contains_cache' would result in all six of the above functions as external public functions in the git binary. At present, only three of these functions are actually called, so the trade-off seems to favour letting the compiler inline the commit-slab functions. Signed-off-by: Ramsay Jones <ramsay@ramsayjones.plus.com> Signed-off-by: Junio C Hamano <gitster@pobox.com>
Diffstat (limited to 'commit-reach.h')
-rw-r--r--commit-reach.h5
1 files changed, 3 insertions, 2 deletions
diff --git a/commit-reach.h b/commit-reach.h
index 7d313e2..f41d8f6 100644
--- a/commit-reach.h
+++ b/commit-reach.h
@@ -1,12 +1,13 @@
#ifndef __COMMIT_REACH_H__
#define __COMMIT_REACH_H__
+#include "commit.h"
#include "commit-slab.h"
-struct commit;
struct commit_list;
-struct contains_cache;
struct ref_filter;
+struct object_id;
+struct object_array;
struct commit_list *get_merge_bases_many(struct commit *one,
int n,