44 lines
2.8 KiB
Plaintext
44 lines
2.8 KiB
Plaintext
In general, merging process should not be very difficult, but we need to
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track various ABI changes and GCC-specific patches carefully. Here is a
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general list of actions required to perform the merge:
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* Checkout recent GCC tree.
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* Run merge.sh script from libsanitizer directory.
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* Modify Makefile.am files into asan/tsan/lsan/ubsan/sanitizer_common/interception
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directories if needed. In particular, you may need to add new source files
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and remove old ones in source files list, add new flags to {C, CXX}FLAGS if
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needed and update DEFS with new defined variables. You can find these changes
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in corresponding CMakeLists.txt and config-ix.cmake files from compiler-rt source
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directory.
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* Apply all needed GCC-specific patches to libsanitizer (note that some of
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them might be already included to upstream). The list of these patches is stored
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into LOCAL_PATCHES file.
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* Apply all necessary compiler changes. Be especially careful here, you must
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not break ABI between compiler and library. You can reveal these changes by
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inspecting the history of AddressSanitizer.cpp and ThreadSanitizer.cpp files
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from LLVM source tree.
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* Update ASan testsuite with corresponding tests from lib/asan/tests directory.
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Not all tests can be migrated easily, so you don't need them all to be adapted.
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* Modify configure.ac file if needed (e.g. if you need to add link against new
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library for sanitizer libs).
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* Add new target platforms in configure.tgt script if needed.
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* Bump SONAME for sanitizer libraries in asan/tsan/ubsan libtool-version files
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if ABI has changed.
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* Regenerate configure script and all Makefiles by autoreconf. You should use
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exactly the same autoconf and automake versions as for other GCC directories (current
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versions are written in Makefile.in and configure files).
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* Run regression testing on at least three platforms (e.g. x86-linux-gnu, x86_64-linux-gnu,
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aarch64-linux-gnu, arm-linux-gnueabi).
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* Run {A, UB}San bootstrap on at least three platforms.
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* Compare ABI of corresponding libclang_rt.asan and newly build libasan libraries.
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Similarly you can compare latest GCC release with the newly built libraries
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(libasan.so.*, libubsan.so.*, libtsan.so*).
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You can use a pretty good libabigail tool (https://sourceware.org/libabigail/index.html)
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to perform such a comparision. Note, that the list of exported symbols may differ,
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e.g. because libasan currently does not include UBSan runtime.
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* Split your changes into logical parts (e.g. raw merge, compiler changes, GCC-specific changes
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in libasan, configure/Makefile changes). The review process has O(N^2) complexity, so you
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would simplify and probably speed up the review process by doing this.
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* Send your patches for review to GCC Patches Mailing List (gcc-patches@gcc.gnu.org).
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* Update LOCAL_PATCHES file when you've committed the whole patch set with new revisions numbers.
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