Remove the asmjs native optimizer (#12131)

This is no longer in use since fastcomp removal.

See: #11860

ChangeLog.md

@@ -17,6 +17,9 @@ See docs/process.md for how version tagging works.
 
 Current Trunk
 -------------
+- The native optimizer and the corresponding config setting
+  (`EMSCRIPTEN_NATIVE_OPTIMIZER`) have been removed (it was only relevant to
+  asmjs/fastcomp backend).
 - Remove `ALLOC_DYNAMIC` and deprecate `dynamicAlloc`. (#12057, which also
   removes the internal `DYNAMICTOP_PTR` API.)
 - Add `ABORT_ON_EXCEPTIONS` which will abort when an unhandled WASM exception

embuilder.py

@@ -4,8 +4,7 @@
 # University of Illinois/NCSA Open Source License.  Both these licenses can be
 # found in the LICENSE file.
 
-"""Tool to manage building of system libraries and other components.
-such as ports and the native optimizer.
+"""Tool to manage building of system libraries and ports.
 
 In general emcc will build them automatically on demand, so you do not
 strictly need to use this tool, but it gives you more control over the
@@ -20,7 +19,6 @@
 
 from tools import shared
 from tools import system_libs
-from tools import js_optimizer
 import emscripten
 
 
@@ -97,15 +95,6 @@ def get_help():
   build %s
 
 Issuing 'embuilder.py build ALL' causes each task to be built.
-
-It is also possible to build native_optimizer manually by using CMake. To
-do that, run
-
-   1. cd $EMSCRIPTEN/tools/optimizer
-   2. cmake . -DCMAKE_BUILD_TYPE=Release
-   3. make (or mingw32-make/vcbuild/msbuild on Windows)
-
-and set up the location to the native optimizer in .emscripten
 ''' % '\n        '.join(all_tasks)
 
 
@@ -196,10 +185,6 @@ def main():
       if force:
         shared.Cache.erase_file('generated_struct_info.json')
       emscripten.generate_struct_info()
-    elif what == 'native_optimizer':
-      if force:
-        shared.Cache.erase_file('optimizer.2.exe')
-      js_optimizer.get_native_optimizer()
     elif what == 'icu':
       build_port('icu', libname('libicuuc'))
     elif what == 'zlib':

tests/test_core.py

@@ -8449,9 +8449,6 @@ def setUp(self):
 simd2 = make_run('simd2', emcc_args=['-O2', '-msimd128'])
 bulkmem2 = make_run('bulkmem2', emcc_args=['-O2', '-mbulk-memory'])
 
-# asm.js
-asm2nn = make_run('asm2nn', emcc_args=['-O2'], settings={'WASM': 0}, env={'EMCC_NATIVE_OPTIMIZER': '0'})
-
 # wasm
 wasm2s = make_run('wasm2s', emcc_args=['-O2'], settings={'SAFE_HEAP': 1})
 wasm2ss = make_run('wasm2ss', emcc_args=['-O2'], settings={'STACK_OVERFLOW_CHECK': 2})

tests/test_sanity.py

@@ -33,8 +33,6 @@ def restore():
 def restore_and_set_up():
   restore()
   with open(CONFIG_FILE, 'a') as f:
-    # don't use the native optimizer from the emsdk - we want to test how it builds
-    f.write('\nEMSCRIPTEN_NATIVE_OPTIMIZER = ""\n')
     # make LLVM_ROOT sensitive to the LLVM env var, as we test that
     f.write('LLVM_ROOT = "%s"\n' % LLVM_ROOT)
     # unfreeze the cache, so we can test that

tools/js_optimizer.py

@@ -11,7 +11,6 @@
 import re
 import json
 import shutil
-import logging
 
 __rootpath__ = os.path.abspath(os.path.dirname(os.path.dirname(__file__)))
 sys.path.insert(1, __rootpath__)
@@ -35,9 +34,6 @@ def path_from_root(*pathelems):
   return os.path.join(__rootpath__, *pathelems)
 
 
-# Passes supported by the native optimizer
-NATIVE_PASSES = set(['asm', 'asmPreciseF32', 'receiveJSON', 'emitJSON', 'eliminate', 'eliminateMemSafe', 'simplifyExpressions', 'simplifyIfs', 'optimizeFrounds', 'registerize', 'registerizeHarder', 'minifyNames', 'minifyLocals', 'minifyWhitespace', 'cleanup', 'asmLastOpts', 'last', 'noop', 'closure'])
-
 JS_OPTIMIZER = path_from_root('tools', 'js-optimizer.js')
 
 NUM_CHUNKS_PER_CORE = 3
@@ -52,8 +48,6 @@ def path_from_root(*pathelems):
 func_sig_json = re.compile(r'\["defun", ?"([_\w$]+)",')
 import_sig = re.compile(r'(var|const) ([_\w$]+ *=[^;]+);')
 
-NATIVE_OPTIMIZER = os.environ.get('EMCC_NATIVE_OPTIMIZER') or '2' # use optimized native optimizer by default (can also be '1' or 'g')
-
 
 def split_funcs(js, just_split=False):
   if just_split:
@@ -74,137 +68,6 @@ def split_funcs(js, just_split=False):
   return funcs
 
 
-def get_native_optimizer():
-  # Allow users to override the location of the optimizer executable by setting
-  # an environment variable EMSCRIPTEN_NATIVE_OPTIMIZER=/path/to/optimizer(.exe)
-  opt = os.environ.get('EMSCRIPTEN_NATIVE_OPTIMIZER')
-  if opt:
-    logging.debug('env forcing native optimizer at ' + opt)
-    return opt
-  # Also, allow specifying the location of the optimizer in .emscripten
-  # configuration file under EMSCRIPTEN_NATIVE_OPTIMIZER='/path/to/optimizer'
-  opt = shared.EMSCRIPTEN_NATIVE_OPTIMIZER
-  if opt:
-    logging.debug('config forcing native optimizer at ' + opt)
-    return opt
-
-  log_output = None if DEBUG else subprocess.PIPE
-
-  def get_optimizer(name, args):
-    def create_optimizer_cmake():
-      shared.logging.debug('building native optimizer via CMake: ' + name)
-      output = shared.Cache.get_path(name)
-      shared.try_delete(output)
-
-      if NATIVE_OPTIMIZER == '1':
-        cmake_build_type = 'RelWithDebInfo'
-      elif NATIVE_OPTIMIZER == '2':
-        cmake_build_type = 'Release'
-      elif NATIVE_OPTIMIZER == 'g':
-        cmake_build_type = 'Debug'
-
-      build_path = shared.Cache.get_path('optimizer_build_' + cmake_build_type)
-      shared.try_delete(os.path.join(build_path, 'CMakeCache.txt'))
-
-      if not os.path.exists(build_path):
-        os.mkdir(build_path)
-
-      if WINDOWS:
-        # Poor man's check for whether or not we should attempt 64 bit build
-        if os.environ.get('ProgramFiles(x86)'):
-          cmake_generators = [
-            'Visual Studio 15 2017 Win64',
-            'Visual Studio 15 2017',
-            'Visual Studio 14 2015 Win64',
-            'Visual Studio 14 2015',
-            'Visual Studio 12 Win64', # The year component is omitted for compatibility with older CMake.
-            'Visual Studio 12',
-            'Visual Studio 11 Win64',
-            'Visual Studio 11',
-            'MinGW Makefiles',
-            'Unix Makefiles',
-          ]
-        else:
-          cmake_generators = [
-            'Visual Studio 15 2017',
-            'Visual Studio 14 2015',
-            'Visual Studio 12',
-            'Visual Studio 11',
-            'MinGW Makefiles',
-            'Unix Makefiles',
-          ]
-      else:
-        cmake_generators = ['Unix Makefiles']
-
-      for cmake_generator in cmake_generators:
-        # Delete CMakeCache.txt so that we can switch to a new CMake generator.
-        shared.try_delete(os.path.join(build_path, 'CMakeCache.txt'))
-        proc = subprocess.Popen(['cmake', '-G', cmake_generator, '-DCMAKE_BUILD_TYPE=' + cmake_build_type, shared.path_from_root('tools', 'optimizer')], cwd=build_path, stdin=log_output, stdout=log_output, stderr=log_output)
-        proc.communicate()
-        if proc.returncode == 0:
-          make = ['cmake', '--build', build_path]
-          if 'Visual Studio' in cmake_generator:
-            make += ['--config', cmake_build_type, '--', '/nologo', '/verbosity:minimal']
-
-          proc = subprocess.Popen(make, cwd=build_path, stdin=log_output, stdout=log_output, stderr=log_output)
-          proc.communicate()
-          if proc.returncode == 0:
-            if WINDOWS and 'Visual Studio' in cmake_generator:
-              shutil.copyfile(os.path.join(build_path, cmake_build_type, 'optimizer.exe'), output)
-            else:
-              shutil.copyfile(os.path.join(build_path, 'optimizer'), output)
-            return output
-
-      assert False
-
-    def create_optimizer():
-      shared.logging.debug('building native optimizer: ' + name)
-      output = shared.Cache.get_path(name)
-      shared.try_delete(output)
-      for compiler in [shared.CLANG_CXX, 'g++', 'clang++']: # try our clang first, otherwise hope for a system compiler in the path
-        shared.logging.debug('  using ' + compiler)
-        try:
-          shared.run_process([compiler,
-                              shared.path_from_root('tools', 'optimizer', 'parser.cpp'),
-                              shared.path_from_root('tools', 'optimizer', 'simple_ast.cpp'),
-                              shared.path_from_root('tools', 'optimizer', 'optimizer.cpp'),
-                              shared.path_from_root('tools', 'optimizer', 'optimizer-shared.cpp'),
-                              shared.path_from_root('tools', 'optimizer', 'optimizer-main.cpp'),
-                              '-O3', '-std=c++11', '-fno-exceptions', '-fno-rtti', '-o', output] + args,
-                             stdout=log_output, stderr=log_output)
-        except Exception as e:
-          logging.debug(str(e))
-          continue # perhaps the later compilers will succeed
-        # success
-        return output
-      shared.exit_with_error('Failed to build native optimizer')
-
-    use_cmake_to_configure = WINDOWS # Currently only Windows uses CMake to drive the optimizer build, but set this to True to use on other platforms as well.
-    if use_cmake_to_configure:
-      return shared.Cache.get(name, create_optimizer_cmake)
-    else:
-      return shared.Cache.get(name, create_optimizer)
-
-  if NATIVE_OPTIMIZER == '1':
-    return get_optimizer('optimizer.exe', [])
-  elif NATIVE_OPTIMIZER == '2':
-    return get_optimizer('optimizer.2.exe', ['-DNDEBUG'])
-  elif NATIVE_OPTIMIZER == 'g':
-    return get_optimizer('optimizer.g.exe', ['-O0', '-g', '-fno-omit-frame-pointer'])
-
-
-# Check if we should run a pass or set of passes natively. if a set of passes,
-# they must all be valid to run in the native optimizer at once.
-def use_native(x, source_map=False):
-  if source_map:
-    return False
-  if not NATIVE_OPTIMIZER or NATIVE_OPTIMIZER == '0':
-    return False
-  if isinstance(x, list):
-    return len(NATIVE_PASSES.intersection(x)) == len(x) and 'asm' in x
-  return x in NATIVE_PASSES
-
-
 class Minifier(object):
   """asm.js minification support. We calculate minification of
   globals here, then pass that into the parallel js-optimizer.js runners which
@@ -445,15 +308,8 @@ def write_chunk(chunk, i):
 
   with ToolchainProfiler.profile_block('run_optimizer'):
     if len(filenames):
-      if not use_native(passes, source_map):
-        commands = [shared.NODE_JS + [JS_OPTIMIZER, f, 'noPrintMetadata'] +
-                    (['--debug'] if source_map else []) + passes for f in filenames]
-      else:
-        # use the native optimizer
-        shared.logging.debug('js optimizer using native')
-        assert not source_map # XXX need to use js optimizer
-        commands = [[get_native_optimizer(), f] + passes for f in filenames]
-      # print [' '.join(command) for command in commands]
+      commands = [shared.NODE_JS + [JS_OPTIMIZER, f, 'noPrintMetadata'] +
+                  (['--debug'] if source_map else []) + passes for f in filenames]
 
       cores = min(cores, len(filenames))
       if len(chunks) > 1 and cores >= 2: