1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
273
274
275
276
277
278
279
280
281
282
283
284
285
286
287
288
289
290
291
292
293
294
295
296
297
|
llvm-cov - emit coverage information
====================================
SYNOPSIS
--------
:program:`llvm-cov` *command* [*args...*]
DESCRIPTION
-----------
The :program:`llvm-cov` tool shows code coverage information for
programs that are instrumented to emit profile data. It can be used to
work with ``gcov``\-style coverage or with ``clang``\'s instrumentation
based profiling.
If the program is invoked with a base name of ``gcov``, it will behave as if
the :program:`llvm-cov gcov` command were called. Otherwise, a command should
be provided.
COMMANDS
--------
* :ref:`gcov <llvm-cov-gcov>`
* :ref:`show <llvm-cov-show>`
* :ref:`report <llvm-cov-report>`
.. program:: llvm-cov gcov
.. _llvm-cov-gcov:
GCOV COMMAND
------------
SYNOPSIS
^^^^^^^^
:program:`llvm-cov gcov` [*options*] *SOURCEFILE*
DESCRIPTION
^^^^^^^^^^^
The :program:`llvm-cov gcov` tool reads code coverage data files and displays
the coverage information for a specified source file. It is compatible with the
``gcov`` tool from version 4.2 of ``GCC`` and may also be compatible with some
later versions of ``gcov``.
To use :program:`llvm-cov gcov`, you must first build an instrumented version
of your application that collects coverage data as it runs. Compile with the
``-fprofile-arcs`` and ``-ftest-coverage`` options to add the
instrumentation. (Alternatively, you can use the ``--coverage`` option, which
includes both of those other options.) You should compile with debugging
information (``-g``) and without optimization (``-O0``); otherwise, the
coverage data cannot be accurately mapped back to the source code.
At the time you compile the instrumented code, a ``.gcno`` data file will be
generated for each object file. These ``.gcno`` files contain half of the
coverage data. The other half of the data comes from ``.gcda`` files that are
generated when you run the instrumented program, with a separate ``.gcda``
file for each object file. Each time you run the program, the execution counts
are summed into any existing ``.gcda`` files, so be sure to remove any old
files if you do not want their contents to be included.
By default, the ``.gcda`` files are written into the same directory as the
object files, but you can override that by setting the ``GCOV_PREFIX`` and
``GCOV_PREFIX_STRIP`` environment variables. The ``GCOV_PREFIX_STRIP``
variable specifies a number of directory components to be removed from the
start of the absolute path to the object file directory. After stripping those
directories, the prefix from the ``GCOV_PREFIX`` variable is added. These
environment variables allow you to run the instrumented program on a machine
where the original object file directories are not accessible, but you will
then need to copy the ``.gcda`` files back to the object file directories
where :program:`llvm-cov gcov` expects to find them.
Once you have generated the coverage data files, run :program:`llvm-cov gcov`
for each main source file where you want to examine the coverage results. This
should be run from the same directory where you previously ran the
compiler. The results for the specified source file are written to a file named
by appending a ``.gcov`` suffix. A separate output file is also created for
each file included by the main source file, also with a ``.gcov`` suffix added.
The basic content of an ``.gcov`` output file is a copy of the source file with
an execution count and line number prepended to every line. The execution
count is shown as ``-`` if a line does not contain any executable code. If
a line contains code but that code was never executed, the count is displayed
as ``#####``.
OPTIONS
^^^^^^^
.. option:: -a, --all-blocks
Display all basic blocks. If there are multiple blocks for a single line of
source code, this option causes llvm-cov to show the count for each block
instead of just one count for the entire line.
.. option:: -b, --branch-probabilities
Display conditional branch probabilities and a summary of branch information.
.. option:: -c, --branch-counts
Display branch counts instead of probabilities (requires -b).
.. option:: -f, --function-summaries
Show a summary of coverage for each function instead of just one summary for
an entire source file.
.. option:: --help
Display available options (--help-hidden for more).
.. option:: -l, --long-file-names
For coverage output of files included from the main source file, add the
main file name followed by ``##`` as a prefix to the output file names. This
can be combined with the --preserve-paths option to use complete paths for
both the main file and the included file.
.. option:: -n, --no-output
Do not output any ``.gcov`` files. Summary information is still
displayed.
.. option:: -o=<DIR|FILE>, --object-directory=<DIR>, --object-file=<FILE>
Find objects in DIR or based on FILE's path. If you specify a particular
object file, the coverage data files are expected to have the same base name
with ``.gcno`` and ``.gcda`` extensions. If you specify a directory, the
files are expected in that directory with the same base name as the source
file.
.. option:: -p, --preserve-paths
Preserve path components when naming the coverage output files. In addition
to the source file name, include the directories from the path to that
file. The directories are separate by ``#`` characters, with ``.`` directories
removed and ``..`` directories replaced by ``^`` characters. When used with
the --long-file-names option, this applies to both the main file name and the
included file name.
.. option:: -u, --unconditional-branches
Include unconditional branches in the output for the --branch-probabilities
option.
.. option:: -version
Display the version of llvm-cov.
EXIT STATUS
^^^^^^^^^^^
:program:`llvm-cov gcov` returns 1 if it cannot read input files. Otherwise,
it exits with zero.
.. program:: llvm-cov show
.. _llvm-cov-show:
SHOW COMMAND
------------
SYNOPSIS
^^^^^^^^
:program:`llvm-cov show` [*options*] -instr-profile *PROFILE* *BIN* [*SOURCES*]
DESCRIPTION
^^^^^^^^^^^
The :program:`llvm-cov show` command shows line by line coverage of a binary
*BIN* using the profile data *PROFILE*. It can optionally be filtered to only
show the coverage for the files listed in *SOURCES*.
To use :program:`llvm-cov show`, you need a program that's compiled with
instrumentation to emit profile and coverage data. To build such a program with
``clang`` use the ``-fprofile-instr-generate`` and ``-fcoverage-mapping``
flags. If linking with the ``clang`` driver, pass ``-fprofile-instr-generate``
to the link stage to make sure the necessary runtime libraries are linked in.
The coverage information is stored in the built executable or library itself,
and this is what you should pass to :program:`llvm-cov show` as the *BIN*
argument. The profile data is generated by running this instrumented program
normally. When the program exits it will write out a raw profile file,
typically called ``default.profraw``, which can be converted to a format that
is suitable for the *PROFILE* argument using the :program:`llvm-profdata merge`
tool.
OPTIONS
^^^^^^^
.. option:: -show-line-counts
Show the execution counts for each line. This is enabled by default, unless
another ``-show`` option is used.
.. option:: -show-expansions
Expand inclusions, such as preprocessor macros or textual inclusions, inline
in the display of the source file.
.. option:: -show-instantiations
For source regions that are instantiated multiple times, such as templates in
``C++``, show each instantiation separately as well as the combined summary.
.. option:: -show-regions
Show the execution counts for each region by displaying a caret that points to
the character where the region starts.
.. option:: -show-line-counts-or-regions
Show the execution counts for each line if there is only one region on the
line, but show the individual regions if there are multiple on the line.
.. option:: -use-color[=VALUE]
Enable or disable color output. By default this is autodetected.
.. option:: -arch=<name>
If the covered binary is a universal binary, select the architecture to use
when looking up the coverage map. Errors out if the supplied architecture is
not found in the universal binary, or if used on a non-universal binary of
a different architecture.
.. option:: -name=<NAME>
Show code coverage only for functions with the given name.
.. option:: -name-regex=<PATTERN>
Show code coverage only for functions that match the given regular expression.
.. option:: -line-coverage-gt=<N>
Show code coverage only for functions with line coverage greater than the
given threshold.
.. option:: -line-coverage-lt=<N>
Show code coverage only for functions with line coverage less than the given
threshold.
.. option:: -region-coverage-gt=<N>
Show code coverage only for functions with region coverage greater than the
given threshold.
.. option:: -region-coverage-lt=<N>
Show code coverage only for functions with region coverage less than the given
threshold.
.. program:: llvm-cov report
.. _llvm-cov-report:
REPORT COMMAND
--------------
SYNOPSIS
^^^^^^^^
:program:`llvm-cov report` [*options*] -instr-profile *PROFILE* *BIN* [*SOURCES*]
DESCRIPTION
^^^^^^^^^^^
The :program:`llvm-cov report` command displays a summary of the coverage of a
binary *BIN* using the profile data *PROFILE*. It can optionally be filtered to
only show the coverage for the files listed in *SOURCES*.
If no source files are provided, a summary line is printed for each file in the
coverage data. If any files are provided, summaries are shown for each function
in the listed files instead.
For information on compiling programs for coverage and generating profile data,
see :ref:`llvm-cov-show`.
OPTIONS
^^^^^^^
.. option:: -use-color[=VALUE]
Enable or disable color output. By default this is autodetected.
.. option:: -arch=<name>
If the covered binary is a universal binary, select the architecture to use
when looking up the coverage map. Errors out if the supplied architecture is
not found in the universal binary, or if used on a non-universal binary of
a different architecture.
|
