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| In order to perform code coverage exercise on the Firefox browser, we need to go through at least two iterations.
| | Documentation moved in-tree: https://firefox-source-docs.mozilla.org/tools/code-coverage/index.html |
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| First : Instrument the C/C++ code in the Firefox browser using 'gcov' and run all tests against the browser.
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| Second: Instrument the javascript part of the Firefox browser and run all tests against the browser.
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| Finally we will generate a combined report which would also have the path traversal capability so that we can look at the details of coverage at the source code line level.
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| *STEP 1
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| Create a .mozconfig file with the following statements
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| export CFLAGS="-fprofile-arcs -ftest-coverage"
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| export CXXFLAGS="-fprofile-arcs -ftest-coverage"
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| export EXTRA_DSO_LDFLAGS="-lgcov -static-libgcc"
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| export LDFLAGS="-lgcov -static-libgcc"
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| ac_add_options --enable-application=browser
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| mk_add_options MOZ_OBJDIR=@TOPSRCDIR@/../mozcentral-dbg
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| ac_add_options --enable-tests
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| ac_add_options --enable-mochitest
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| ac_add_options --enable-debug
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| ac_add_options --disable-optimize
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| ac_add_options --enable-jsd
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| mk_add_options MOZ_MAKE_FLAGS="-j3"
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| mk_add_options AUTOCONF=autoconf2.13
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| As of now, there is a bug https://bugzilla.mozilla.org/show_bug.cgi?id=461270 which prevents the NSPR from getting linked in the code coverage mode.
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| The work around to address this problem is as follows:
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| * Modify [ in the trunk you checked out ] src/nsprpub/config/rules.mk on line #352
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| ** Change it from $(MKSHLIB) $(OBJS) $(RES) $(EXTRA_LIBS) to $(MKSHLIB) $(OBJS) $(RES) $(EXTRA_LIBS) $(LD_FLAGS)
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| Execute the usual build command 'make -f client.mk build'
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| Please make sure that you have all the build dependencies installed properly before attempting the build.
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| Once the build is ready , all you have to do is to go into
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| ~/mozcentral-dbg/_tests/testing/mochitest and execute the following command.
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| * python runtests.py
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| Please keep the focus on the Firefox browser at all times or else your tests will fail.
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| After you are done with the test runs, you will end up with a bunch of *.gcda and *.gcno files in your build directory.
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| Now, come back into your home directory and execute the following command
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| lcov -c -i -d mozcentral-dbg -o app.info
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| The lcov tool will go through the entire build directory and generates an app.info file in your home directory
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| Then, execute the following command
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| genhtml app.info
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| If by any chance the above command fails to complete, use the following option.
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| genhtml --no-source app.info
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| The resulting index.html is the landing page for all your code coverage data for the C/C++ code in the Firefox browser.
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