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Major part of this PR is commit implementing support for DT_INIT_ARRAY for BOLT runtime libraries initialization. Also, it adds related hook-init test & fixes couple of X86 instrumentation tests. This commit follows implementation of instrumentation hook via DT_FINI_ARRAY (https://github.com/llvm/llvm-project/pull/67348) and extends it for BOLT runtime libraries (including instrumentation library) initialization hooking. Initialization has has differences compared to finalization: - Executables always use ELF entry point address. Update code checks it and updates init_array entry if ELF is shared library (have no interp entry) and have no DT_INIT entry. Also this commit introduces "runtime-lib-init-hook" option to select primary initialization hook (entry_point, init, init_array) with fall back to next available hook in input binary. e.g. in case of libc we can explicitly set it to init_array. - Shared library init_array entries relocations usually has R_AARCH64_ABS64 type on AArch64 binaries. We check relocation type and adjust methods for reading init_array relocations in discovery and update methods. --------- Co-authored-by: Vasily Leonenko <vasily.leonenko@huawei.com>
BOLT Documentation ==================== The BOLT documentation is written using the Sphinx documentation generator. It is currently tested with Sphinx 1.1.3. To build the documents into html configure BOLT with the following cmake options: * -DLLVM_ENABLE_SPHINX=ON * -DBOLT_INCLUDE_DOCS=ON After configuring BOLT with these options the make rule `docs-bolt-html` should be available.