linux-kernel - [PATCH v1 0/5] Support dynamic opening of capstone and libLLVM

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Message-Id: <20250120173208.344231-1-irogers@google.com>
Date: Mon, 20 Jan 2025 09:32:03 -0800
From: Ian Rogers <irogers@...gle.com>
To: Peter Zijlstra <peterz@...radead.org>, Ingo Molnar <mingo@...hat.com>, 
	Arnaldo Carvalho de Melo <acme@...nel.org>, Namhyung Kim <namhyung@...nel.org>, 
	Mark Rutland <mark.rutland@....com>, 
	Alexander Shishkin <alexander.shishkin@...ux.intel.com>, Jiri Olsa <jolsa@...nel.org>, 
	Ian Rogers <irogers@...gle.com>, Adrian Hunter <adrian.hunter@...el.com>, 
	Kan Liang <kan.liang@...ux.intel.com>, Nathan Chancellor <nathan@...nel.org>, 
	Nick Desaulniers <ndesaulniers@...gle.com>, Bill Wendling <morbo@...gle.com>, 
	Justin Stitt <justinstitt@...gle.com>, "Steinar H. Gunderson" <sesse@...gle.com>, 
	Charlie Jenkins <charlie@...osinc.com>, Changbin Du <changbin.du@...wei.com>, 
	"Masami Hiramatsu (Google)" <mhiramat@...nel.org>, James Clark <james.clark@...aro.org>, 
	Kajol Jain <kjain@...ux.ibm.com>, Athira Rajeev <atrajeev@...ux.vnet.ibm.com>, 
	Li Huafei <lihuafei1@...wei.com>, Dmitry Vyukov <dvyukov@...gle.com>, 
	Andi Kleen <ak@...ux.intel.com>, linux-kernel@...r.kernel.org, 
	linux-perf-users@...r.kernel.org, llvm@...ts.linux.dev
Subject: [PATCH v1 0/5] Support dynamic opening of capstone and libLLVM

Linking against libcapstone and libLLVM can be a significant increase
in dependencies and size of memory footprint. 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) moves the capstone and LLVM code to their own C files,
2) simplifies a little the capstone code,
3) adds perf_ variants of the 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.

Ian Rogers (5):
  perf capstone: Move capstone functionality into its own file
  perf llvm: Move llvm functionality into its own file
  perf capstone: Remove open_capstone_handle
  perf capstone: Support for dlopen-ing libcapstone.so
  perf llvm: Support for dlopen-ing libLLVM.so

 tools/perf/Makefile.config         |  13 +
 tools/perf/Makefile.perf           |  23 +-
 tools/perf/builtin-script.c        |   2 -
 tools/perf/tests/make              |   2 +
 tools/perf/util/Build              |   4 +-
 tools/perf/util/capstone.c         | 723 +++++++++++++++++++++++++++++
 tools/perf/util/capstone.h         |  24 +
 tools/perf/util/disasm.c           | 612 +-----------------------
 tools/perf/util/disasm.h           |   2 +
 tools/perf/util/llvm-c-helpers.cpp | 113 ++++-
 tools/perf/util/llvm.c             | 537 +++++++++++++++++++++
 tools/perf/util/llvm.h             |  24 +
 tools/perf/util/print_insn.c       | 117 +----
 tools/perf/util/srcline.c          |  65 +--
 tools/perf/util/srcline.h          |   6 +
 15 files changed, 1481 insertions(+), 786 deletions(-)
 create mode 100644 tools/perf/util/capstone.c
 create mode 100644 tools/perf/util/capstone.h
 create mode 100644 tools/perf/util/llvm.c
 create mode 100644 tools/perf/util/llvm.h

-- 
2.48.0.rc2.279.g1de40edade-goog