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Use -fmacro-prefix-map to strip build path

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Because meson does not provide a simple way to get the relative build
path, it is computed with a pair of foreach loops. As meson does not
have a simple way to compute string length (except via underscorify
and 63 split operations), the build script uses a shell command
instead.

If the compiler does not suppot -fmacro-prefix-map, then fall back
to passing in the relative path prefix, and use its length to offset
the uses of __FILE__ in log messages so that the build path is at
least still not included in the logs. This is significantly more
efficient than calling _sway_strip_path.
This commit is contained in:
Manuel Stoeckl 2019-06-22 23:13:19 -04:00 committed by Drew DeVault
parent e3a3917d3a
commit 2dc4978d8a
3 changed files with 48 additions and 25 deletions
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17
common/log.c
View file

@ -93,20 +93,3 @@ void _sway_log(sway_log_importance_t verbosity, const char *fmt, ...) {
sway_log_stderr(verbosity, fmt, args);
va_end(args);
}
// strips the path prefix from filepath
// will try to strip SWAY_SRC_DIR as well as a relative src dir
// e.g. '/src/build/sway/util/log.c' and
// '../util/log.c' will both be stripped to
// 'util/log.c'
const char *_sway_strip_path(const char *filepath) {
static int srclen = sizeof(SWAY_SRC_DIR);
if (strstr(filepath, SWAY_SRC_DIR) == filepath) {
filepath += srclen;
} else if (*filepath == '.') {
while (*filepath == '.' || *filepath == '/') {
++filepath;
}
}
return filepath;
}

16
include/log.h
View file

@ -33,22 +33,26 @@ void _sway_vlog(sway_log_importance_t verbosity, const char *format, va_list arg
void _sway_abort(const char *filename, ...) ATTRIB_PRINTF(1, 2);
bool _sway_assert(bool condition, const char* format, ...) ATTRIB_PRINTF(2, 3);
// TODO: get meson to precompute this, for better reproducibility/less overhead
const char *_sway_strip_path(const char *filepath);
#ifdef SWAY_REL_SRC_DIR
// strip prefix from __FILE__, leaving the path relative to the project root
#define _SWAY_FILENAME ((const char *)__FILE__ + sizeof(SWAY_REL_SRC_DIR) - 1)
#else
#define _SWAY_FILENAME __FILE__
#endif
#define sway_log(verb, fmt, ...) \
_sway_log(verb, "[%s:%d] " fmt, _sway_strip_path(__FILE__), __LINE__, ##__VA_ARGS__)
_sway_log(verb, "[%s:%d] " fmt, _SWAY_FILENAME, __LINE__, ##__VA_ARGS__)
#define sway_vlog(verb, fmt, args) \
_sway_vlog(verb, "[%s:%d] " fmt, _sway_strip_path(__FILE__), __LINE__, args)
_sway_vlog(verb, "[%s:%d] " fmt, _SWAY_FILENAME, __LINE__, args)
#define sway_log_errno(verb, fmt, ...) \
sway_log(verb, fmt ": %s", ##__VA_ARGS__, strerror(errno))
#define sway_abort(FMT, ...) \
_sway_abort("[%s:%d] " FMT, _sway_strip_path(__FILE__), __LINE__, ##__VA_ARGS__)
_sway_abort("[%s:%d] " FMT, _SWAY_FILENAME, __LINE__, ##__VA_ARGS__)
#define sway_assert(COND, FMT, ...) \
_sway_assert(COND, "[%s:%d] %s:" FMT, _sway_strip_path(__FILE__), __LINE__, __PRETTY_FUNCTION__, ##__VA_ARGS__)
_sway_assert(COND, "[%s:%d] %s:" FMT, _SWAY_FILENAME, __LINE__, __PRETTY_FUNCTION__, ##__VA_ARGS__)
#endif

40
meson.build
View file

@ -13,8 +13,6 @@ project(
add_project_arguments(
[
'-DSWAY_SRC_DIR="@0@"'.format(meson.current_source_dir()),
'-DWL_HIDE_DEPRECATED',
'-DWLR_USE_UNSTABLE',
@ -142,6 +140,44 @@ if git.found()
endif
add_project_arguments('-DSWAY_VERSION=@0@'.format(version), language: 'c')
# Compute the relative path used by compiler invocations.
source_root = meson.current_source_dir().split('/')
build_root = meson.build_root().split('/')
relative_dir_parts = []
i = 0
in_prefix = true
foreach p : build_root
if i >= source_root.length() or not in_prefix or p != source_root[i]
in_prefix = false
relative_dir_parts += '..'
endif
i += 1
endforeach
i = 0
in_prefix = true
foreach p : source_root
if i >= build_root.length() or not in_prefix or build_root[i] != p
in_prefix = false
relative_dir_parts += p
endif
i += 1
endforeach
relative_dir = join_paths(relative_dir_parts) + '/'
# Strip relative path prefixes from the code if possible, otherwise hide them.
if cc.has_argument('-fmacro-prefix-map=/prefix/to/hide=')
add_project_arguments(
'-fmacro-prefix-map=@0@='.format(relative_dir),
language: 'c',
)
else
add_project_arguments(
'-DSWAY_REL_SRC_DIR="@0@"'.format(relative_dir),
language: 'c',
)
endif
sway_inc = include_directories('include')
subdir('include')