Issue 5201 - [emscripten] Replace EM_ASM calls by a custom JavaScript library

compile

 #!/usr/bin/env python
 
 # This file is part of Adblock Plus <https://adblockplus.org/>,
 # Copyright (C) 2006-2017 Eyeo GmbH
 #
 # Adblock Plus is free software: you can redistribute it and/or modify
 # it under the terms of the GNU General Public License version 3 as
 # published by the Free Software Foundation.
 #
 # Adblock Plus is distributed in the hope that it will be useful,
 # but WITHOUT ANY WARRANTY; without even the implied warranty of
 # MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 # GNU General Public License for more details.
 #
 # You should have received a copy of the GNU General Public License
 # along with Adblock Plus.  If not, see <http://www.gnu.org/licenses/>.
 
 import argparse
 import os
 import subprocess
 import sys
 
 BASE_DIR = os.path.dirname(__file__)
 SOURCE_DIR = os.path.join(BASE_DIR, 'compiled')
+JS_LIBRARY = os.path.join(SOURCE_DIR, 'library.js')
 BINDINGS_GENERATOR = os.path.join(SOURCE_DIR, 'bindings.cpp.js')
 BINDINGS_OUTPUT = os.path.join(SOURCE_DIR, 'bindings.js')
 COMPILER_OUTPUT = os.path.join(BASE_DIR, 'lib', 'compiled.js')
 GENERATION_PARAMS = {
     'SHELL_FILE': "'{}'".format(os.path.abspath(os.path.join(SOURCE_DIR,
                                                              'shell.js'))),
     'ASM_JS': 2,  # "almost asm"
     'TOTAL_MEMORY': 16*1024*1024,
     'TOTAL_STACK': 1*1024*1024,
     'ALLOW_MEMORY_GROWTH': 1,
     'NO_EXIT_RUNTIME': 1,
     'NO_DYNAMIC_EXECUTION': 1,
     'NO_FILESYSTEM': 1,
     'INVOKE_RUN': 0,
     'TEXTDECODER': 0,
     'EXPORTED_RUNTIME_METHODS': ['cwrap', 'ccall', 'stringToAscii'],
 }
 DEFINES = []
 ADDITIONAL_PARAMS = ['-O3', '-m32', '-std=gnu++14', '--memory-init-file', '0',
                      '--emit-symbol-map', '-Wall', '-Werror', '-fno-exceptions',
-                     '-fno-rtti']
+                     '-fno-rtti', '--js-library', JS_LIBRARY]
 
 
 def get_source_files(phase):
     for (path, dirs, files) in os.walk(SOURCE_DIR):
         for f in files:
             if os.path.splitext(f)[1] != '.cpp':
                 continue
             if (
                 phase != 'bindings' and
                 os.path.basename(path) == 'bindings' and
@@ skipping 11 matching lines @@
         'EMSCRIPTEN': scope['EMSCRIPTEN_ROOT'],
         'PYTHON': scope.get('PYTHON', sys.executable),
         'NODE_JS': scope.get('NODE_JS', 'node'),
     })
     return env
 
 
 def generate_bindings(env):
     params = [
         env['PYTHON'], os.path.join(env['EMSCRIPTEN'], 'emcc'),
-        '-o', BINDINGS_GENERATOR, '-std=gnu++14', '-DPRINT_BINDINGS',
+        '-o', BINDINGS_GENERATOR, '-std=gnu++14', '--js-library', JS_LIBRARY,
     ] + list(get_source_files('bindings'))
     subprocess.check_call(params, env=env)
 
     with open(BINDINGS_OUTPUT, 'w') as file:
         subprocess.check_call([env['NODE_JS'], BINDINGS_GENERATOR],
                               stdout=file)
 
 
 def run_compiler(env, debug=False, tracing=False):
     params = [
@@ skipping 33 matching lines @@
     parser.add_argument(
         '-t', '--tracing',
         action='store_true',
         help='Enable memory tracing'
     )
     args = parser.parse_args()
 
     env = getenv(args.emscripten_config)
     generate_bindings(env)
     run_compiler(env, debug=args.debug, tracing=args.tracing)