lua: Remove unused files

The `sym` module no longer needs to be exported. The `LD` module is no
longer used anywhere.

src/lua/bcc/init.lua

@@ -14,7 +14,4 @@ See the License for the specific language governing permissions and
 limitations under the License.
 ]]
 require("bcc.vendor.helpers")
-return {
-  BPF = require("bcc.bpf"),
-  sym = require("bcc.sym"),
-}
+return { BPF = require("bcc.bpf") }

src/lua/bcc/ld.lua

---[[
-Copyright 2016 GitHub, Inc
-
-Licensed under the Apache License, Version 2.0 (the "License");
-you may not use this file except in compliance with the License.
-You may obtain a copy of the License at
-
-http://www.apache.org/licenses/LICENSE-2.0
-
-Unless required by applicable law or agreed to in writing, software
-distributed under the License is distributed on an "AS IS" BASIS,
-WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
-See the License for the specific language governing permissions and
-limitations under the License.
-]]
-local ffi = require("ffi")
-local posix = require("bcc.vendor.posix")
-
-local _find_library_cache = {}
-local function _find_library(name)
-  if _find_library_cache[name] ~= nil then
-    return _find_library_cache[name]
-  end
-
-  local arch = ffi.arch
-  local abi_type = "libc6"
-
-  if ffi.abi("64bit") then
-    if arch == "x64" then
-      abi_type = abi_type .. ",x86-64"
-    elseif arch == "ppc" or arch == "mips" then
-      abi_type = abi_type .. ",64bit"
-    end
-  end
-
-  local pattern = "%s+lib" .. name:escape() .. "%.%S+ %(" .. abi_type:escape() .. ".-%) => (%S+)"
-  local f = assert(io.popen("/sbin/ldconfig -p"))
-  local path = nil
-
-  for line in f:lines() do
-    path = line:match(pattern)
-    if path then break end
-  end
-  f:close()
-
-  if path then
-    _find_library_cache[name] = path
-  end
-
-  return path
-end
-
-local _find_load_address_cache = {}
-local function _find_load_address(path)
-  if _find_load_address_cache[path] ~= nil then
-    return _find_load_address_cache[path]
-  end
-
-  local addr = os.spawn(
-    [[/usr/bin/objdump -x %s | awk '$1 == "LOAD" && $3 ~ /^[0x]*$/ { print $5 }']],
-    path)
-
-  if addr then
-    addr = posix.tonumber64(addr, 16)
-    _find_load_address_cache[path] = addr
-  end
-
-  return addr
-end
-
-local _find_symbol_cache = {}
-local function _find_symbol(path, sym)
-  assert(path and sym)
-
-  if _find_symbol_cache[path] == nil then
-    _find_symbol_cache[path] = {}
-  end
-
-  local symbols = _find_symbol_cache[path]
-  if symbols[sym] ~= nil then
-    return symbols[sym]
-  end
-
-  local addr = os.spawn(
-    [[/usr/bin/objdump -tT %s | awk -v sym=%s '$NF == sym && $4 == ".text" { print $1; exit }']],
-    path, sym)
-
-  if addr then
-    addr = posix.tonumber64(addr, 16)
-    symbols[sym] = addr
-  end
-
-  return addr
-end
-
-local function _check_path_symbol(name, sym, addr)
-  assert(name)
-
-  local path = name:sub(1,1) == "/" and name or _find_library(name)
-  assert(path, "could not find library "..name)
-
-  -- TODO: realpath
-  local load_addr = _find_load_address(path)
-  assert(load_addr, "could not find load address for "..path)
-
-  if addr == nil and sym ~= nil then
-    addr = _find_symbol(path, sym)
-  end
-
-  assert(addr, "could not find address of symbol "..sym)
-  return path, (addr - load_addr)
-end
-
-return {
-  check_path_symbol=_check_path_symbol,
-  find_symbol=_find_symbol,
-  find_load_address=_find_load_address,
-  find_library=_find_library
-}

src/lua/bcc/run.lua

@@ -59,7 +59,6 @@ return function()
   local utils = {
     argparse = require("bcc.vendor.argparse"),
     posix = require("bcc.vendor.posix"),
-    sym = require("bcc.sym"),
   }
 
   local command = dofile(tracefile)

src/lua/squishy

@@ -11,7 +11,6 @@ Module "bcc.sym" "bcc/sym.lua"
 Module "bcc.libbcc" "bcc/libbcc.lua"
 Module "bcc.tracerpipe" "bcc/tracerpipe.lua"
 Module "bcc.table" "bcc/table.lua"
-Module "bcc.ld" "bcc/ld.lua"
 
 Main "bcc/run.lua"
 Output "bcc.lua"