Disassemble specific functions with "llvm-objdump" in macOS.

dasym.rb

#!/usr/bin/env ruby

LLVM_OBJDUMP = "objdump"

options = %w(
  --no-leading-addr
  --no-show-raw-insn
  --symbolize-operands
  --x86-asm-syntax=intel
)

if ARGV.size < 2
  $stderr.puts("Usage: ruby dasym.rb $obj_file $pattern")
  exit(-1)
end

obj_file = ARGV[0]
pattern  = ARGV[1]

def get_syms(src)
  src.lines.flat_map { |row| row.scan(/(?<=^.{24} __TEXT,__text ).+/) }
end

rows_raw = get_syms `#{LLVM_OBJDUMP} -t #{obj_file}`
rows_dec = get_syms `#{LLVM_OBJDUMP} -t #{obj_file} -C`

raise if rows_raw.size != rows_dec.size

rows_raw.zip(rows_dec).each { |sym, name| 
  system("#{LLVM_OBJDUMP} #{obj_file} --disassemble-symbols='#{sym}' #{options.join(' ')} | c++filt") if name.include?(pattern)
}