index.js

'use strict'

const sorted = require('sorted-array-functions')
const pump = require('pump')
const through = require('through2').obj
const createLoader = require('./' + process.platform)
const { PROCESSED } = require('../constants')

module.exports = createLoadSymbols

function createLoadSymbols (state) {
  const { opts } = state
  const load = createLoader(opts)

  return loadSymbols

  function loadSymbols (lib, cb) {
    if (lib[PROCESSED] === true) {
      cb()
      return
    }
    const { start, end, slide } = lib
    const startn = parseInt(start, 16)
    const endn = parseInt(end, 16)
    const sliden = parseInt(slide, 10)

    pump(load(lib), through(({ addr, name }, _, next) => {
      // undefined symbols:
      if (!addr) {
        next()
        return
      }

      var addrn = parseInt(addr, 16)

      if (addrn === 0) {
        next()
        return
      }

      addrn += (
        (addrn < startn - sliden && addrn < endn - startn)
          ? startn
          : sliden
      )

      // duplicates (names may differ slightly...)
      if (addrn in state.code && state.code[addrn].name.length >= name.length) {
        next()
        return
      }

      state.code[addrn] = {
        name: name,
        lib: lib,
        start: '0x' + addrn.toString(16),
        type: 'CPP'
      }

      sorted.add(state.addresses, addrn)

      next()
    }), (err) => {
      lib[PROCESSED] = true
      cb(err)
    })
  }
}