Function eval_ctors

tools/building.py:443–487

(js_file, wasm_file, debug_info)

# evals ctors. if binaryen_bin is provided, it is the dir of the binaryen tool
# for this, and we are in wasm mode
def eval_ctors(js_file, wasm_file, debug_info):
  CTOR_ADD_PATTERN = f"wasmExports['{WASM_CALL_CTORS}']();"

  js = utils.read_file(js_file)

  has_wasm_call_ctors = False

  # eval the ctor caller as well as main, or, in standalone mode, the proper
  # entry/init function
  if not settings.STANDALONE_WASM:
    ctors = []
    kept_ctors = []
    has_wasm_call_ctors = CTOR_ADD_PATTERN in js
    if has_wasm_call_ctors:
      ctors += [WASM_CALL_CTORS]
    if settings.HAS_MAIN:
      main = 'main'
      if '__main_argc_argv' in settings.WASM_EXPORTS:
        main = '__main_argc_argv'
      ctors += [main]
      # TODO perhaps remove the call to main from the JS? or is this an abi
      #      we want to preserve?
      kept_ctors += [main]
    if not ctors:
      logger.info('ctor_evaller: no ctors')
      return
    args = ['--ctors=' + ','.join(ctors)]
    if kept_ctors:
      args += ['--kept-exports=' + ','.join(kept_ctors)]
  else:
    if settings.EXPECT_MAIN:
      ctor = '_start'
    else:
      ctor = '_initialize'
    args = ['--ctors=' + ctor, '--kept-exports=' + ctor]
  if settings.EVAL_CTORS == 2:
    args += ['--ignore-external-input']
  logger.info('ctor_evaller: trying to eval global ctors (' + ' '.join(args) + ')')
  out = run_binaryen_command('wasm-ctor-eval', wasm_file, wasm_file, args=args, stdout=PIPE, debug=debug_info)
  logger.info('\n\n' + out)
  num_successful = out.count('success on')
  if num_successful and has_wasm_call_ctors:
    js = js.replace(CTOR_ADD_PATTERN, '')
    settings.WASM_EXPORTS.remove(WASM_CALL_CTORS)
  utils.write_file(js_file, js)


def get_closure_compiler():