From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from mail-pg1-f202.google.com (mail-pg1-f202.google.com [209.85.215.202]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 06B672BD58C for ; Sun, 5 Oct 2025 21:22:20 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.215.202 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759699342; cv=none; b=ISgegEAgy8JTUxf2VFQC/jex7ODxd37Jullx3Q5JF9rs6URHC5PDTC+Htb6zjyEbMMHo5CxPZHturgat+VVT/APafMBCRwEOjPuqrylhkl9K19f1U3LNoJS1b6/wdbRbBZNL7CEnuG40NxbOpHqtxWhrFNjWVkmpGWvZ/emxTJ0= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1759699342; c=relaxed/simple; bh=uBfNTZIROFYAuvG18LuPdj2NxQlfFuC7yQVLR2gxl+0=; h=Date:Mime-Version:Message-ID:Subject:From:To:Content-Type; b=gev0IOdDBs3eyz60fDty/Ki/wJBogIUJ7pXB6h1mn2cWpKkkPIIbI62tW02Jb7sCp8dmirAu5M7xbYwcgl19DDV3S+8Ewar4aFAPtVBYjkURnHegcHlM3exS6Mt84oB/NMUJwyoDDz7YcXIRh8MrWgCLLWWUcbs1w5PcKH+vpD8= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=VqEKHUuh; arc=none smtp.client-ip=209.85.215.202 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--irogers.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="VqEKHUuh" Received: by mail-pg1-f202.google.com with SMTP id 41be03b00d2f7-b552f91033cso4977565a12.1 for ; Sun, 05 Oct 2025 14:22:20 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1759699340; x=1760304140; darn=lists.linux.dev; h=to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=5g52GEX71wtTx2tfnNC5TSdOtsaO7f4YX3EP4D2cWZ8=; b=VqEKHUuhSqkf/dZ/t1hn50kIiMT/tHPBuB8/E5TZ8du9zwCO4Ssw5/BMmkqzlAsce1 f+qyhsgj226eTtj75wcuq0iK/fpZs9Qh5KxdTiiXXayUTvOdLOYeHknFhBjgrDeezC4M v4pJ360Lr8fKb5JTbjf1LFu9lOMoG95af9llsRVdpDV0wGow3Dw7FrJdd1ZkdlBZC590 bIxMeB+uGVbfg47LsXOAqQ3P/rSTH+6COjjggXMuL/CyEWGyWADvHVZlYuHEeePaGoLj upiGs8RhbMOJq4jwYYwD9wJP2R7RfyhjwkUcwojHXQFtM7HJoGKH0BDYiG9R4ZtqYf9d wjmA== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1759699340; x=1760304140; h=to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=5g52GEX71wtTx2tfnNC5TSdOtsaO7f4YX3EP4D2cWZ8=; b=UFxX7zxL2QrHCrn2puuDsHJNUWilYGXsjCMxrC/oDMUPUlVEGKqHnU+qg79xL1RerB j8QRulzhO4u/stYkoqiiBtXHITitQf6k5uFi6Re+NVgDaLInUv7UaXrnX+OCGhS2AUPq DrPkW8OP3FMgJpLgK4FAyeJh1Yd3ZXeTX602TwkwFSQsRY36/dsTPNhdwnbR7g7Yheqn m8NxrjcMDj8oUuL9HrkVUPkZpG4cF7qfGwoEHhz++cKcftaovMKbCQjz0pYPGlClPo6E z3ddgaOJcZ8xeqdRDiYdYdP56rrISBzDGg+F8ATT/g1VbwscABeaIvXSLJU6oICVxBgK +4gw== X-Forwarded-Encrypted: i=1; AJvYcCU3AlbvpOntxlTQymFt+0drDRjanjqaf4NhNjIqGPS8oE/9FzTfS/yBkVkpeT8ksqAXOkr/@lists.linux.dev X-Gm-Message-State: AOJu0YxMHQuZa8L/C0rFBLgGf/1rLJzdARgVgvWxNXwjoq/x2wuQM9/J 1cqYeTf6E599ZoQAaYOh9fOyIUhADBW7xWGyvT8ofoCV2abq5d+23vhW+O03ieRkUnnIABEvJ6q oXa3MbzhAbw== X-Google-Smtp-Source: AGHT+IGaGnZmkzZlXEN57mujpYGO6s3ZAN9KBECTlVg1xIa0H7mMnIXmY+upFlssKwOGGndoikR19WyBEF0D X-Received: from pjbnl7.prod.google.com ([2002:a17:90b:3847:b0:332:8246:26ae]) (user=irogers job=prod-delivery.src-stubby-dispatcher) by 2002:a05:6a20:7f8b:b0:2ac:7567:c069 with SMTP id adf61e73a8af0-32b61e583d9mr13965706637.17.1759699340343; Sun, 05 Oct 2025 14:22:20 -0700 (PDT) Date: Sun, 5 Oct 2025 14:22:01 -0700 Precedence: bulk X-Mailing-List: llvm@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.51.0.618.g983fd99d29-goog Message-ID: <20251005212212.2892175-1-irogers@google.com> Subject: [PATCH v7 00/11] Capstone/llvm improvements + dlopen support From: Ian Rogers To: Arnaldo Carvalho de Melo , Peter Zijlstra , Ingo Molnar , Namhyung Kim , Alexander Shishkin , Jiri Olsa , Ian Rogers , Adrian Hunter , Nathan Chancellor , Nick Desaulniers , Bill Wendling , Justin Stitt , Charlie Jenkins , Eric Biggers , "Masami Hiramatsu (Google)" , James Clark , Collin Funk , "Dr. David Alan Gilbert" , Li Huafei , Athira Rajeev , Stephen Brennan , Dmitry Vyukov , Alexandre Ghiti , Haibo Xu , Andi Kleen , linux-kernel@vger.kernel.org, linux-perf-users@vger.kernel.org, bpf@vger.kernel.org, llvm@lists.linux.dev, Song Liu Content-Type: text/plain; charset="UTF-8" Linking against libcapstone and libLLVM can be a significant increase in dependencies and file size if building statically. For something like `perf record` the disassembler and addr2line functionality won't be used. Support dynamically loading these libraries using dlopen and then calling the appropriate functions found using dlsym. The patch series: 1) feature check libLLVM support and avoid always reinitializing the disassembler. 2) adds BPF JIT disassembly support to in memory disassemblers (LLVM and capstone) by just directing them at the BPF info linear JIT instructions (note this doesn't support source lines); 3) adds fallback to srcline's addr2line so that llvm_addr2line is tried first, then the deprecated libbfd and then the forked command tried next, moving the code for forking out of the main srcline.c file in the process. 4) adds perf_ variants of the capstone/llvm functions that will either directly call the function or use dlsym to discover it; The addr2line LLVM functionality is written in C++. To avoid linking against libLLVM for this, a new LIBLLVM_DYNAMIC option is added where the C++ code with the libLLVM dependency will be built into a libperf-llvm.so and that dlsym-ed and called against. Ideally LLVM would extend their C API to avoid this. v7: Refactor now the first 5 patches, that largely moved code around, have landed. Move the dlopen code to the end of the series so that the first 8 patches can be picked improving capstone/LLVM support without adding the dlopen code. Rename the cover letter and disassembler cleanup patches. v6: Refactor the libbfd along with capstone and LLVM, previous patch series had tried to avoid this by just removing the deprecated BUILD_NONDISTRO code. Remove the libtracefs removal into its own patch. v5: Rebase and comment typo fix. v4: Rebase and addition of a patch removing an unused struct variable. v3: Add srcline addr2line fallback trying LLVM first then forking a process. This came up in conversation with Steinar Gunderson . Tweak the cover letter message to try to address Andi Kleen's feedback that the series doesn't really achieve anything. v2: Add mangling of the function names in libperf-llvm.so to avoid potential infinite recursion. Add BPF JIT disassembly support to LLVM and capstone. Add/rebase the BUILD_NONDISTRO cleanup onto the series from: https://lore.kernel.org/lkml/20250111202851.1075338-1-irogers@google.com/ Some other minor additional clean up. Ian Rogers (11): perf check: Add libLLVM feature perf llvm: Reduce LLVM initialization perf dso: Move read_symbol from llvm/capstone to dso perf dso: Support BPF programs in dso__read_symbol perf dso: Clean up read_symbol error handling perf disasm: Make ins__scnprintf and ins__is_nop static perf srcline: Fallback between addr2line implementations perf disasm: Remove unused evsel from annotate_args perf capstone: Support for dlopen-ing libcapstone.so perf llvm: Support for dlopen-ing libLLVM.so perf llvm: Mangle libperf-llvm.so function names tools/perf/Documentation/perf-check.txt | 1 + tools/perf/Makefile.config | 13 + tools/perf/Makefile.perf | 24 +- tools/perf/builtin-check.c | 1 + tools/perf/tests/make | 2 + tools/perf/util/Build | 3 +- tools/perf/util/addr2line.c | 439 +++++++++++++++++++++ tools/perf/util/addr2line.h | 20 + tools/perf/util/annotate.c | 1 - tools/perf/util/capstone.c | 352 ++++++++++++----- tools/perf/util/config.c | 2 +- tools/perf/util/disasm.c | 18 +- tools/perf/util/disasm.h | 4 - tools/perf/util/dso.c | 112 ++++++ tools/perf/util/dso.h | 4 + tools/perf/util/libbfd.c | 4 +- tools/perf/util/libbfd.h | 6 +- tools/perf/util/llvm-c-helpers.cpp | 120 +++++- tools/perf/util/llvm-c-helpers.h | 24 +- tools/perf/util/llvm.c | 374 +++++++++++++----- tools/perf/util/llvm.h | 3 - tools/perf/util/srcline.c | 495 ++---------------------- tools/perf/util/srcline.h | 1 - 23 files changed, 1314 insertions(+), 709 deletions(-) create mode 100644 tools/perf/util/addr2line.c create mode 100644 tools/perf/util/addr2line.h -- 2.51.0.618.g983fd99d29-goog