|author||David 'Digit' Turner <email@example.com>||Tue Nov 18 20:13:10 2014 +0100|
|committer||David 'Digit' Turner <firstname.lastname@example.org>||Tue Nov 18 20:13:10 2014 +0100|
libc: Move <sgidefs.h> to libc/arch-mips/ This is a MIPS-only header, and should not be part of the common headers. See http://b.android.com/79841 for context. Change-Id: I610bc3ff626b57e7854dad15a4a2f67e1e5ded75
The C library. Stuff like
The math library. Traditionally Unix systems kept stuff like
cos(3) in a separate library to save space in the days before shared libraries.
The dynamic linker interface library. This is actually just a bunch of stubs that the dynamic linker replaces with pointers to its own implementation at runtime. This is where stuff like
The C++ ABI support functions. The C++ compiler doesn't know how to implement thread-safe static initialization and the like, so it just calls functions that are supplied by the system. Stuff like
__cxa_pure_virtual live here.
The dynamic linker. When you run a dynamically-linked executable, its ELF file has a
DT_INTERP entry that says “use the following program to start me”. On Android, that‘s either
linker64 (depending on whether it’s a 32-bit or 64-bit executable). It's responsible for loading the ELF executable into memory and resolving references to symbols (so that when your code tries to jump to
fopen(3), say, it lands in the right place).
tests/ directory contains unit tests. Roughly arranged as one file per publicly-exported header file.
benchmarks/ directory contains benchmarks.
Adding a system call usually involves:
As mentioned above, this is currently a two-step process:
This is fully automated:
If you make a change that is likely to have a wide effect on the tree (such as a libc header change), you should run
make checkbuild. A regular
make will not build the entire tree; just the minimum number of projects that are required for the device. Tests, additional developer tools, and various other modules will not be built. Note that
make checkbuild will not be complete either, as
make tests covers a few additional modules, but generally speaking
make checkbuild is enough.
The tests are all built from the tests/ directory.
$ mma $ adb sync $ adb shell /data/nativetest/bionic-unit-tests/bionic-unit-tests32 $ adb shell \ /data/nativetest/bionic-unit-tests-static/bionic-unit-tests-static32 # Only for 64-bit targets $ adb shell /data/nativetest/bionic-unit-tests/bionic-unit-tests64 $ adb shell \ /data/nativetest/bionic-unit-tests-static/bionic-unit-tests-static64
The host tests require that you have
lunched either an x86 or x86_64 target.
$ mma # 64-bit tests for 64-bit targets, 32-bit otherwise. $ mm bionic-unit-tests-run-on-host # Only exists for 64-bit targets. $ mm bionic-unit-tests-run-on-host32
As a way to check that our tests do in fact test the correct behavior (and not just the behavior we think is correct), it is possible to run the tests against the host's glibc.
$ mma $ bionic-unit-tests-glibc32 # already in your path $ bionic-unit-tests-glibc64
For either host or target coverage, you must first:
$ export NATIVE_COVERAGE=true
$ mma $ adb sync $ adb shell \ GCOV_PREFIX=/data/local/tmp/gcov \ GCOV_PREFIX_STRIP=`echo $ANDROID_BUILD_TOP | grep -o / | wc -l` \ /data/nativetest/bionic-unit-tests/bionic-unit-tests32 $ acov
acov will pull all coverage information from the device, push it to the right directories, run
lcov, and open the coverage report in your browser.
First, build and run the host tests as usual (see above).
$ croot $ lcov -c -d $ANDROID_PRODUCT_OUT -o coverage.info $ genhtml -o covreport coverage.info # or lcov --list coverage.info
The coverage report is now available at