diff options
Diffstat (limited to 'emcc')
| -rwxr-xr-x | emcc | 144 |
1 files changed, 92 insertions, 52 deletions
@@ -49,7 +49,7 @@ emcc can be influenced by a few environment variables: import os, sys, shutil, tempfile, subprocess, shlex, time, re, logging from subprocess import PIPE, STDOUT -from tools import shared +from tools import shared, jsrun from tools.shared import Compression, execute, suffix, unsuffixed, unsuffixed_basename from tools.response_file import read_response_file @@ -127,11 +127,6 @@ Options that are modified or new in %s include: (For details on the affects of different opt levels, see apply_opt_level() in tools/shared.py and also src/settings.js.) - Note: Optimizations are only done when - compiling to JavaScript, not to intermediate - bitcode, *unless* you build with - EMCC_OPTIMIZE_NORMALLY=1 (not recommended - unless you know what you are doing!) -O2 As -O1, plus the relooper (loop recreation), LLVM -O2 optimizations, and @@ -144,7 +139,7 @@ Options that are modified or new in %s include: -s DOUBLE_MODE=0 -s PRECISE_I64_MATH=0 --closure 1 - --llvm-lto 1 + --llvm-lto 3 This is not recommended at all. A better idea is to try each of these separately on top of @@ -203,10 +198,13 @@ Options that are modified or new in %s include: -g2 Preserve function names -g3 Preserve variable names -g4 Preserve LLVM debug info (if -g was - used when compiling the C/C++ sources) - and show line number debug comments. - This is the highest level of debuggability. - (default in -O0) + used when compiling the C/C++ sources), + show line number debug comments, and + generate source maps. This is the highest + level of debuggability. Note that this + may make -O1 and above significantly + slower because JS optimization will be + limited to 1 core. (default in -O0) --typed-arrays <mode> 0: No typed arrays 1: Parallel typed arrays @@ -217,10 +215,15 @@ Options that are modified or new in %s include: 2: -O2 LLVM optimizations 3: -O3 LLVM optimizations (default in -O2+) - --llvm-lto <level> 0: No LLVM LTO (default in -O2 and below) - 1: LLVM LTO (default in -O3) + --llvm-lto <level> 0: No LLVM LTO (default) + 1: LLVM LTO is performed + 2: We combine all the bitcode and run LLVM opt -O3 + on that (which optimizes across modules, but is + not the same as normal LTO), but do not do normal + LTO + 3: We do both 2 and then 1 Note: If LLVM optimizations are not run - (see --llvm-opts), setting this to 1 has no + (see --llvm-opts), setting this has no effect. --closure <on> 0: No closure compiler (default in -O2 and below) @@ -731,6 +734,14 @@ try: settings_changes = [] + def validate_arg_level(level_string, max_level, err_msg): + try: + level = int(level_string) + assert 0 <= level <= max_level + except: + raise Exception(err_msg) + return level + for i in range(len(newargs)): newargs[i] = newargs[i].strip() # On Windows Vista (and possibly others), excessive spaces in the command line leak into the items in this array, so trim e.g. 'foo.cpp ' -> 'foo.cpp' if newargs[i].startswith('-O'): @@ -739,11 +750,7 @@ try: if requested_level == 's': requested_level = 2 settings_changes.append('INLINING_LIMIT=50') - try: - opt_level = int(requested_level) - assert 0 <= opt_level <= 3 - except: - raise Exception('Invalid optimization level: ' + newargs[i]) + opt_level = validate_arg_level(requested_level, 3, 'Invalid optimization level: ' + newargs[i]) newargs[i] = '' elif newargs[i].startswith('--llvm-opts'): check_bad_eq(newargs[i]) @@ -787,12 +794,8 @@ try: newargs[i+1] = '' elif newargs[i].startswith('-g'): requested_level = newargs[i][2:] or '3' - try: - debug_level = int(requested_level) - assert 0 <= debug_level <= 4 - except: - raise Exception('Invalid debug level: ' + newargs[i]) - newargs[i] = '-g' # discard level for clang args + debug_level = validate_arg_level(requested_level, 4, 'Invalid debug level: ' + newargs[i]) + newargs[i] = '-g' # we'll need this to get LLVM debug info elif newargs[i] == '--bind': bind = True newargs[i] = '' @@ -881,10 +884,19 @@ try: newargs = newargs + [default_cxx_std] if llvm_opts is None: llvm_opts = LLVM_OPT_LEVEL[opt_level] - if llvm_lto is None: llvm_lto = opt_level >= 3 + if llvm_lto is None and opt_level >= 3: llvm_lto = 3 if opt_level == 0: debug_level = 4 if closure is None and opt_level == 3: closure = True + if llvm_lto is None and bind: + logging.debug('running lto for embind') # XXX this is a workaround for a pointer issue + llvm_lto = 1 + + # TODO: support source maps with js_transform + if js_transform and debug_level >= 4: + logging.warning('disabling source maps because a js transform is being done') + debug_level = 3 + if DEBUG: start_time = time.time() # done after parsing arguments, which might affect debug state if closure: @@ -1050,6 +1062,10 @@ try: else: raise Exception('unknown llvm target: ' + str(shared.LLVM_TARGET)) + if shared.Settings.USE_TYPED_ARRAYS != 2 and llvm_opts > 0: + logging.warning('disabling LLVM optimizations, need typed arrays mode 2 for them') + llvm_opts = 0 + ## Compile source code to bitcode logging.debug('compiling to bitcode') @@ -1089,20 +1105,20 @@ try: shared.Building.llvm_as(input_file, temp_file) temp_files.append(temp_file) - if not LEAVE_INPUTS_RAW: assert len(temp_files) == len(input_files) + if not LEAVE_INPUTS_RAW: + assert len(temp_files) == len(input_files) + + # Optimize source files + if llvm_opts > 0: + for i in range(len(input_files)): + input_file = input_files[i] + if input_files[i].endswith(SOURCE_SUFFIXES): + temp_file = temp_files[i] + logging.debug('optimizing %s with -O%d' % (input_file, llvm_opts)) + shared.Building.llvm_opt(temp_file, llvm_opts) # If we were just asked to generate bitcode, stop there if final_suffix not in JS_CONTAINING_SUFFIXES: - if llvm_opts > 0: - if not os.environ.get('EMCC_OPTIMIZE_NORMALLY'): - logging.warning('-Ox flags ignored, since not generating JavaScript') - else: - for input_file in input_files: - if input_file.endswith(SOURCE_SUFFIXES): - logging.debug('optimizing %s with -O%d since EMCC_OPTIMIZE_NORMALLY defined' % (input_file, llvm_opts)) - shared.Building.llvm_opt(in_temp(unsuffixed(uniquename(input_file)) + '.o'), llvm_opts) - else: - logging.debug('not optimizing %s despite EMCC_OPTIMIZE_NORMALLY since not source code' % (input_file)) if not specified_target: for input_file in input_files: shutil.move(in_temp(unsuffixed(uniquename(input_file)) + '.o'), unsuffixed_basename(input_file) + '.' + final_suffix) @@ -1134,6 +1150,8 @@ try: symbols = filter(lambda symbol: symbol not in exclude, symbols) return set(symbols) + lib_opts = ['-O2'] + # XXX We also need to add libc symbols that use malloc, for example strdup. It's very rare to use just them and not # a normal malloc symbol (like free, after calling strdup), so we haven't hit this yet, but it is possible. libc_symbols = read_symbols(shared.path_from_root('system', 'lib', 'libc.symbols')) @@ -1142,7 +1160,7 @@ try: libcxx_symbols = read_symbols(shared.path_from_root('system', 'lib', 'libcxx', 'symbols'), exclude=libc_symbols) libcxxabi_symbols = read_symbols(shared.path_from_root('system', 'lib', 'libcxxabi', 'symbols'), exclude=libc_symbols) - # XXX we should disable EMCC_DEBUG (and EMCC_OPTIMIZE_NORMALLY?) when building libs, just like in the relooper + # XXX we should disable EMCC_DEBUG when building libs, just like in the relooper def build_libc(lib_filename, files): o_s = [] @@ -1151,7 +1169,7 @@ try: musl_internal_includes = shared.path_from_root('system', 'lib', 'libc', 'musl', 'src', 'internal') for src in files: o = in_temp(os.path.basename(src) + '.o') - execute([shared.PYTHON, shared.EMCC, shared.path_from_root('system', 'lib', src), '-o', o, '-I', musl_internal_includes], stdout=stdout, stderr=stderr) + execute([shared.PYTHON, shared.EMCC, shared.path_from_root('system', 'lib', src), '-o', o, '-I', musl_internal_includes] + lib_opts, stdout=stdout, stderr=stderr) o_s.append(o) if prev_cxx: os.environ['EMMAKEN_CXX'] = prev_cxx shared.Building.link(o_s, in_temp(lib_filename)) @@ -1162,7 +1180,7 @@ try: for src in files: o = in_temp(src + '.o') srcfile = shared.path_from_root(src_dirname, src) - execute([shared.PYTHON, shared.EMXX, srcfile, '-o', o, '-std=c++11'], stdout=stdout, stderr=stderr) + execute([shared.PYTHON, shared.EMXX, srcfile, '-o', o, '-std=c++11'] + lib_opts, stdout=stdout, stderr=stderr) o_s.append(o) shared.Building.link(o_s, in_temp(lib_filename)) return in_temp(lib_filename) @@ -1409,16 +1427,15 @@ try: # Optimize, if asked to if not LEAVE_INPUTS_RAW: link_opts = [] if debug_level >= 4 else ['-strip-debug'] # remove LLVM debug if we are not asked for it - if llvm_opts > 0: - if not os.environ.get('EMCC_OPTIMIZE_NORMALLY'): - shared.Building.llvm_opt(in_temp(target_basename + '.bc'), llvm_opts) - if DEBUG: save_intermediate('opt', 'bc') - # Do LTO in a separate pass to work around LLVM bug XXX (see failure e.g. in cubescript) - else: - logging.debug('not running opt because EMCC_OPTIMIZE_NORMALLY was specified, opt should have been run before') + + if llvm_lto >= 2: + logging.debug('running LLVM opt -O3 as pre-LTO') + shared.Building.llvm_opt(in_temp(target_basename + '.bc'), ['-O3']) + if DEBUG: save_intermediate('opt', 'bc') + if shared.Building.can_build_standalone(): # If we can LTO, do it before dce, since it opens up dce opportunities - if llvm_lto and shared.Building.can_use_unsafe_opts(): + if llvm_lto and llvm_lto != 2 and shared.Building.can_use_unsafe_opts(): if not shared.Building.can_inline(): link_opts.append('-disable-inlining') # do not internalize in std-link-opts - it ignores internalize-public-api-list - and add a manual internalize link_opts += ['-disable-internalize'] + shared.Building.get_safe_internalize() + ['-std-link-opts'] @@ -1496,9 +1513,11 @@ try: final += '.tr.js' posix = True if not shared.WINDOWS else False logging.debug('applying transform: %s' % js_transform) - execute(shlex.split(js_transform, posix=posix) + [os.path.abspath(final)]) + subprocess.check_call(shlex.split(js_transform, posix=posix) + [os.path.abspath(final)]) if DEBUG: save_intermediate('transformed') + js_transform_tempfiles = [final] + # It is useful to run several js optimizer passes together, to save on unneeded unparsing/reparsing js_optimizer_queue = [] def flush_js_optimizer_queue(): @@ -1508,7 +1527,8 @@ try: if shared.Settings.ASM_JS: js_optimizer_queue = ['asm'] + js_optimizer_queue logging.debug('applying js optimization passes: %s', js_optimizer_queue) - final = shared.Building.js_optimizer(final, js_optimizer_queue, jcache) + final = shared.Building.js_optimizer(final, js_optimizer_queue, jcache, debug_level >= 4) + js_transform_tempfiles.append(final) if DEBUG: save_intermediate('js_opts') else: for name in js_optimizer_queue: @@ -1516,7 +1536,8 @@ try: if shared.Settings.ASM_JS: passes = ['asm'] + passes logging.debug('applying js optimization pass: %s', passes) - final = shared.Building.js_optimizer(final, passes, jcache) + final = shared.Building.js_optimizer(final, passes, jcache, debug_level >= 4) + js_transform_tempfiles.append(final) save_intermediate(name) js_optimizer_queue = [] @@ -1525,7 +1546,8 @@ try: if DEBUG == '2': # Clean up the syntax a bit - final = shared.Building.js_optimizer(final, [], jcache) + final = shared.Building.js_optimizer(final, [], jcache, debug_level >= 4) + js_transform_tempfiles.append(final) if DEBUG: save_intermediate('pretty') def get_eliminate(): @@ -1543,6 +1565,8 @@ try: flush_js_optimizer_queue() logging.debug('running closure') + # no need to add this to js_transform_tempfiles, because closure and + # debug_level > 0 are never simultaneously true final = shared.Building.closure_compiler(final) if DEBUG: save_intermediate('closure') @@ -1590,6 +1614,7 @@ try: src = re.sub('/\* memory initializer \*/ allocate\(([\d,\.concat\(\)\[\]\\n ]+)"i8", ALLOC_NONE, Runtime\.GLOBAL_BASE\)', repl, src, count=1) open(final + '.mem.js', 'w').write(src) final += '.mem.js' + js_transform_tempfiles[-1] = final # simple text substitution preserves comment line number mappings if DEBUG: if os.path.exists(memfile): save_intermediate('meminit') @@ -1597,12 +1622,25 @@ try: else: logging.debug('did not see memory initialization') + def generate_source_map(map_file_base_name, offset=0): + jsrun.run_js(shared.path_from_root('tools', 'source-maps', 'sourcemapper.js'), + shared.NODE_JS, js_transform_tempfiles + + ['--sourceRoot', os.getcwd(), + '--mapFileBaseName', map_file_base_name, + '--offset', str(offset)]) + # If we were asked to also generate HTML, do that if final_suffix == 'html': logging.debug('generating HTML') shell = open(shell_path).read() html = open(target, 'w') if not Compression.on: + if debug_level >= 4: + match = re.match('.*?<script[^>]*>{{{ SCRIPT_CODE }}}</script>', shell, + re.DOTALL) + if match is None: + raise RuntimeError('Could not find script insertion point') + generate_source_map(target, match.group().count('\n')) html.write(shell.replace('{{{ SCRIPT_CODE }}}', open(final).read())) else: # Compress the main code @@ -1673,6 +1711,8 @@ try: from tools.split import split_javascript_file split_javascript_file(final, unsuffixed(target), split_js_file) else: + if debug_level >= 4: generate_source_map(target) + # copy final JS to output shutil.move(final, target) |