[PATCH v2 00/17] Support dynamic opening of capstone/llvm remove BUILD_NONDISTRO

[Ian Rogers]

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.

BUILD_NONDISTRO is used to build perf against the license incompatible
libbfd and libiberty libraries. As this has been opt-in for nearly 2
years, commit dd317df07207 ("perf build: Make binutil libraries opt
in"), remove the code to simplify the code base.

The patch series:
1) does some initial clean up;
2) moves the capstone and LLVM code to their own C files,
3) simplifies a little the capstone code;
4) adds perf_ variants of the functions that will either directly call
   the function or use dlsym to discover it;
5) adds BPF JIT disassembly support to LLVM and capstone disassembly;
6) removes the BUILD_NONDISTRO code, reduces scope and removes what's possible.

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.

The libbfd BPF disassembly supported source lines, this wasn't ported
to the capstone and LLVM disassembly.

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@xxxxxxxxxx/
    Some other minor additional clean up.

Ian Rogers (17):
  perf build: Remove libtracefs configuration
  perf map: Constify objdump offset/address conversion APIs
  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
  perf llvm: Mangle libperf-llvm.so function names
  perf dso: Move read_symbol from llvm/capstone to dso
  perf dso: Support BPF programs in dso__read_symbol
  perf llvm: Disassemble cleanup
  perf dso: Clean up read_symbol error handling
  perf build: Remove libbfd support
  perf build: Remove libiberty support
  perf build: Remove unused defines
  perf disasm: Remove disasm_bpf
  perf disasm: Make ins__scnprintf and ins__is_nop static

 tools/perf/Documentation/perf-check.txt |   1 -
 tools/perf/Makefile.config              |  90 +---
 tools/perf/Makefile.perf                |  35 +-
 tools/perf/builtin-check.c              |   1 -
 tools/perf/builtin-script.c             |   2 -
 tools/perf/tests/Build                  |   1 -
 tools/perf/tests/builtin-test.c         |   1 -
 tools/perf/tests/make                   |   4 +-
 tools/perf/tests/pe-file-parsing.c      | 101 ----
 tools/perf/tests/tests.h                |   1 -
 tools/perf/util/Build                   |   5 +-
 tools/perf/util/annotate.h              |   1 -
 tools/perf/util/capstone.c              | 682 ++++++++++++++++++++++++
 tools/perf/util/capstone.h              |  24 +
 tools/perf/util/demangle-cxx.cpp        |  22 +-
 tools/perf/util/disasm.c                | 632 +---------------------
 tools/perf/util/disasm.h                |   5 +-
 tools/perf/util/disasm_bpf.c            | 195 -------
 tools/perf/util/disasm_bpf.h            |  12 -
 tools/perf/util/dso.c                   |  98 ++++
 tools/perf/util/dso.h                   |   4 +
 tools/perf/util/llvm-c-helpers.cpp      | 120 ++++-
 tools/perf/util/llvm-c-helpers.h        |  24 +-
 tools/perf/util/llvm.c                  | 489 +++++++++++++++++
 tools/perf/util/llvm.h                  |  24 +
 tools/perf/util/map.c                   |  19 +-
 tools/perf/util/map.h                   |   6 +-
 tools/perf/util/print_insn.c            | 117 +---
 tools/perf/util/srcline.c               | 306 +----------
 tools/perf/util/srcline.h               |   6 +
 tools/perf/util/symbol-elf.c            |  95 ----
 tools/perf/util/symbol.c                | 135 -----
 tools/perf/util/symbol.h                |   4 -
 33 files changed, 1552 insertions(+), 1710 deletions(-)
 delete mode 100644 tools/perf/tests/pe-file-parsing.c
 create mode 100644 tools/perf/util/capstone.c
 create mode 100644 tools/perf/util/capstone.h
 delete mode 100644 tools/perf/util/disasm_bpf.c
 delete mode 100644 tools/perf/util/disasm_bpf.h
 create mode 100644 tools/perf/util/llvm.c
 create mode 100644 tools/perf/util/llvm.h

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2.48.0.rc2.279.g1de40edade-goog