#!/usr/bin/env python2 # -*- Mode: python -*- ''' emcc - compiler helper script ============================= emcc is a drop-in replacement for a compiler like gcc or clang. Tell your build system to use this instead of the compiler, and similarly use emar, emranlib etc. instead of the same command without 'em'. Example uses: * For configure, instead of ./configure, cmake, etc., run emconfigure.py with that command as an argument, for example emconfigure.py ./configure [options] emconfigure.py is a tiny script that just sets some environment vars as a convenience. The command just shown is equivalent to EMMAKEN_JUST_CONFIGURE=1 RANLIB=PATH/emranlib AR=PATH/emar CXX=PATH/em++ CC=PATH/emcc ./configure [options] where PATH is the path to this file. EMMAKEN_JUST_CONFIGURE tells emcc that it is being run in ./configure, so it should relay everything to gcc/g++. You should not define that when running make, of course. * With CMake, the same command will work (with cmake instead of ./configure). You may also be able to do the following in your CMakeLists.txt: SET(CMAKE_C_COMPILER "PATH/emcc") SET(CMAKE_CXX_COMPILER "PATH/em++") SET(CMAKE_LINKER "PATH/emcc") SET(CMAKE_CXX_LINKER "PATH/emcc") SET(CMAKE_C_LINK_EXECUTABLE "PATH/emcc") SET(CMAKE_CXX_LINK_EXECUTABLE "PATH/emcc") SET(CMAKE_AR "PATH/emar") SET(CMAKE_RANLIB "PATH/emranlib") * For SCons the shared.py can be imported like so: __file__ = str(Dir('#/project_path_to_emscripten/dummy/dummy')) __rootpath__ = os.path.dirname(os.path.dirname(os.path.abspath(__file__))) def path_from_root(*pathelems): return os.path.join(__rootpath__, *pathelems) sys.path += [path_from_root('')] from tools.shared import * For using the Emscripten compilers/linkers/etc. you can do: env = Environment() ... env.Append(CCFLAGS = COMPILER_OPTS) env.Replace(LINK = LLVM_LD) env.Replace(LD = LLVM_LD) TODO: Document all relevant setup changes After setting that up, run your build system normally. Note the appearance of em++ instead of emcc for the C++ compiler. This is needed for cases where we get a C++ file with a C extension, in which case CMake can be told to run g++ on it despite the .c extension, see https://github.com/kripken/emscripten/issues/6 (If a similar situation occurs with ./configure, you can do the same there too.) emcc can be influenced by a few environment variables: EMMAKEN_NO_SDK - Will tell emcc *not* to use the emscripten headers. Instead your system headers will be used. EMMAKEN_COMPILER - The compiler to be used, if you don't want the default clang. ''' import os, sys, shutil, tempfile, subprocess, shlex, time from subprocess import PIPE, STDOUT from tools import shared from tools.shared import Compression, execute, suffix, unsuffixed, unsuffixed_basename # Mapping of emcc opt levels to llvm opt levels. We use llvm opt level 3 in emcc opt # levels 2 and 3 (emcc 3 is unsafe opts, so unsuitable for the only level to get # llvm opt level 3, and speed-wise emcc level 2 is already the slowest/most optimizing # level) LLVM_OPT_LEVEL = { 0: 0, 1: 1, 2: 3, 3: 3, } DEBUG = int(os.environ.get('EMCC_DEBUG') or 0) TEMP_DIR = os.environ.get('EMCC_TEMP_DIR') LEAVE_INPUTS_RAW = os.environ.get('EMCC_LEAVE_INPUTS_RAW') # Do not compile .ll files into .bc, just compile them with emscripten directly # Not recommended, this is mainly for the test runner, or if you have some other # specific need. # One major limitation with this mode is that libc and libc++ cannot be # added in. Also, LLVM optimizations will not be done, nor dead code elimination AUTODEBUG = os.environ.get('EMCC_AUTODEBUG') # If set to 1, we will run the autodebugger (the automatic debugging tool, see tools/autodebugger). # Note that this will disable inclusion of libraries. This is useful because including # dlmalloc makes it hard to compare native and js builds EMCC_CFLAGS = os.environ.get('EMCC_CFLAGS') # Additional compiler flags that we treat as if they were passed to us on the commandline if DEBUG: print >> sys.stderr, '\nemcc invocation: ', ' '.join(sys.argv), (' + ' + EMCC_CFLAGS if EMCC_CFLAGS else '') if EMCC_CFLAGS: sys.argv.append(EMCC_CFLAGS) if DEBUG and LEAVE_INPUTS_RAW: print >> sys.stderr, 'emcc: leaving inputs raw' stdout = PIPE if not DEBUG else None # suppress output of child processes stderr = PIPE if not DEBUG else None # unless we are in DEBUG mode shared.check_sanity(force=DEBUG) # Handle some global flags if len(sys.argv) == 1: print 'emcc: no input files' exit(1) # read response files very early on response_file = True while response_file: response_file = None for index in range(1, len(sys.argv)): if sys.argv[index][0] == '@': # found one, loop again next time print >>sys.stderr, 'emcc: using response file: %s' % response_file response_file = sys.argv[index][1:] if not os.path.exists(response_file): print >>sys.stderr, 'emcc: error: Response file not found: %s' % response_file exit(1) response_fd = open(response_file, 'r') extra_args = shlex.split(response_fd.read()) response_fd.close() # slice in extra_args in place of the response file arg sys.argv[index:index+1] = extra_args #if DEBUG: print >>sys.stderr, "Expanded response file: " + " | ".join(sys.argv) break if sys.argv[1] == '--version': revision = '(unknown revision)' here = os.getcwd() os.chdir(shared.path_from_root()) try: revision = execute(['git', 'show'], stdout=PIPE, stderr=PIPE)[0].split('\n')[0] except: pass finally: os.chdir(here) print '''emcc (Emscripten GCC-like replacement) %s (%s) Copyright (C) 2013 the Emscripten authors (see AUTHORS.txt) This is free and open source software under the MIT license. There is NO warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. ''' % (shared.EMSCRIPTEN_VERSION, revision) exit(0) elif sys.argv[1] == '--help': this = os.path.basename('em++' if os.environ.get('EMMAKEN_CXX') else 'emcc') print '''%s [options] file... Most normal gcc/g++ options will work, for example: --help Display this information --version Display compiler version information Options that are modified or new in %s include: -O0 No optimizations (default) -O1 Simple optimizations, including LLVM -O1 optimizations, and no runtime assertions or C++ exception catching (to re-enable C++ exception catching, use -s DISABLE_EXCEPTION_CATCHING=0 ). (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. -O2 As -O1, plus the relooper (loop recreation), plus LLVM -O2 optimizations -O3 As -O2, plus dangerous optimizations that may break the generated code! This adds -s INLINING_LIMIT=0 -s DOUBLE_MODE=0 -s PRECISE_I64_MATH=0 --closure 1 This is not recommended at all. A better idea is to try each of these separately on top of -O2 to see what works. See the wiki for more information. -s OPTION=VALUE JavaScript code generation option passed into the emscripten compiler. For the available options, see src/settings.js Note that for options that are lists, you need quotation marks in most shells, for example -s RUNTIME_LINKED_LIBS="['liblib.so']" or -s "RUNTIME_LINKED_LIBS=['liblib.so']" (without the external "s in either of those, you would get an error) -g Use debug info. Note that you need this during the last compilation phase from bitcode to JavaScript, or else we will remove it by default in -O1 and above. In -O0, line numbers wil be shown in the generated code. In -O1 and above, the optimizer removes those comments. This flag does however have the effect of disabling anything that causes name mangling or minification (closure or the registerize pass). --typed-arrays 0: No typed arrays 1: Parallel typed arrays 2: Shared (C-like) typed arrays (default) --llvm-opts 0: No LLVM optimizations (default in -O0) 1: -O1 LLVM optimizations (default in -O1) 2: -O2 LLVM optimizations 3: -O3 LLVM optimizations (default in -O2+) --llvm-lto 0: No LLVM LTO (default in -O0) 1: LLVM LTO (default in -O1+) Note: If LLVM optimizations are not run (see --llvm-opts), setting this to 1 has no effect. --closure 0: No closure compiler (default in -O2 and below) 1: Run closure compiler. This greatly reduces code size and may in some cases increase runtime speed (although the opposite can also occur). Note that it takes time to run, and may require some changes to the code. This is run by default in -O3. Note: If closure compiler hits an out-of-memory, try adjusting JAVA_HEAP_SIZE in the environment (for example, to 4096m for 4GB). --js-transform will be called on the generated code before it is optimized. This lets you modify the JavaScript, for example adding some code or removing some code, in a way that those modifications will be optimized together with the generated code properly. will be called with the filename of the generated code as a parameter; to modify the code, you can read the original data and then append to it or overwrite it with the modified data. is interpreted as a space-separated list of arguments, for example, of "python processor.py" will cause a python script to be run. --pre-js A file whose contents are added before the generated code. This is done *before* optimization, so it will be minified properly if closure compiler is run. --post-js A file whose contents are added after the generated code This is done *before* optimization, so it will be minified properly if closure compiler is run. --embed-file A file to embed inside the generated JavaScript. The compiled code will be able to access the file in the current directory with the same name as given here. So if you do --embed-file dir/file.dat, then (1) dir/file.dat must exist relative to where you run emcc, and (2) your compiled code will be able to find the file by reading that same path, dir/file.dat. If a directory is passed here, its entire contents will be embedded. --preload-file A file to preload before running the compiled code asynchronously. Otherwise similar to --embed-file, except that this option is only relevant when generating HTML (it uses asynchronous binary XHRs), or JS that will be used in a web page. If a directory is passed here, its entire contents will be preloaded. Preloaded files are stored in filename.data, where filename.html is the main file you are compiling to. To run your code, you will need both the .html and the .data. emcc runs tools/file_packager.py to do the actual packaging of embedded and preloaded files. You can run the file packager yourself if you want, see docs inside that file. You should then put the output of the file packager in an emcc --pre-js, so that it executes before your main compiled code (or run it before in some other way). --compression Compress both the compiled code and embedded/ preloaded files. should be a triple, ,, where native_encoder is a native executable that compresses stdin to stdout (the simplest possible interface), js_decoder is a JavaScript file that implements a decoder, and js_name is the name of the function to call in the decoder file (which should receive an array/typed array and return an array/typed array. Compression only works when generating HTML. When compression is on, all filed specified to be preloaded are compressed in one big archive, which is given the same name as the output HTML but with suffix .data.compress --minify 0: Do not minify the generated JavaScript's whitespace (default if closure compiler will not be run) 1: Minify the generated JavaScript's whitespace (default if closure compiler will be run). Note that this by itself will not minify the code (closure does that) --split Splits the resulting javascript file into pieces to ease debugging. This option only works if Javascript is generated (target -o .js). Files with function declarations must be loaded before main file upon execution. Without "-g" option: Creates files with function declarations up to the given size with the suffix "_functions.partxxx.js" and a main file with the suffix ".js". With "-g" option: Recreates the directory structure of the C source files and stores function declarations in their respective C files with the suffix ".js". If such a file exceeds the given size, files with the suffix ".partxxx.js" are created. The main file resides in the base directory and has the suffix ".js". --bind Compiles the source code using the "embind" bindings approach, which connects C/C++ and JS. --ignore-dynamic-linking Normally emcc will treat dynamic linking like static linking, by linking in the code from the dynamic library. This fails if the same dynamic library is linked more than once. With this option, dynamic linking is ignored, which allows the build system to proceed without errors. However, you will need to manually link to the shared libraries later on yourself. --shell-file The path name to a skeleton HTML file used when generating HTML output. The shell file used needs to have this token inside it: {{{ SCRIPT_CODE }}} Note that this argument is ignored if a target other than HTML is specified using the -o option. --js-library A JavaScript library to use in addition to those in Emscripten's src/library_* -v Turns on verbose output. This will pass -v to Clang, and also enable EMCC_DEBUG to details emcc's operations --jcache Use a JavaScript cache. This is disabled by default. When enabled, emcc will store the results of compilation in a cache and check the cache when compiling later, something like what ccache does. This allows incremental builds - where you are compiling a large program but only modified a small part of it - to be much faster (at the cost of more disk IO for cache accesses). Note that you need to enable --jcache for both loading and saving of data, so you must enable it on a full build for a later incremental build (where you also enable it) to be sped up. --clear-cache Manually clears the cache of compiled emscripten system libraries (libc++, libc++abi, libc). This is normally handled automatically, but if you update llvm in-place (instead of having a different directory for a new version), the caching mechanism can get confused. Clearing the cache can fix weird problems related to cache incompatibilities, like clang failing to link with library files. This also clears other cached data like the jcache and the bootstrapped relooper. After the cache is cleared, this process will exit. The target file, if specified (-o ), defines what will be generated: .js JavaScript .html HTML with embedded JavaScript .bc LLVM bitcode (default) .o LLVM bitcode (same as .bc) The -c option (which tells gcc not to run the linker) will cause LLVM bitcode to be generated, as %s only generates JavaScript in the final linking stage of building. The input file(s) can be either source code files that Clang can handle (C or C++), LLVM bitcode in binary form, or LLVM assembly files in human-readable form. emcc is affected by several environment variables. For details, view the source of emcc (search for 'os.environ'). emcc: supported targets: llvm bitcode, javascript, NOT elf (autoconf likes to see elf above to enable shared object support) ''' % (this, this, this) exit(0) elif len(sys.argv) == 2 and sys.argv[1] == '-v': # -v with no inputs print 'emcc (Emscripten GCC-like replacement + linker emulating GNU ld ) 2.0' exit(subprocess.call([shared.CLANG, '-v'])) def is_minus_s_for_emcc(newargs,i): assert newargs[i] == '-s' if i+1 < len(newargs) and '=' in newargs[i+1]: # -s OPT=VALUE is for us, -s by itself is a linker option return True else: print >> sys.stderr, 'emcc: warning: treating -s as linker option and not as -s OPT=VALUE for js compilation' return False # If this is a configure-type thing, do not compile to JavaScript, instead use clang # to compile to a native binary (using our headers, so things make sense later) CONFIGURE_CONFIG = (os.environ.get('EMMAKEN_JUST_CONFIGURE') or 'conftest.c' in sys.argv) and not os.environ.get('EMMAKEN_JUST_CONFIGURE_RECURSE') CMAKE_CONFIG = 'CMakeFiles/cmTryCompileExec.dir' in ' '.join(sys.argv)# or 'CMakeCCompilerId' in ' '.join(sys.argv) if CONFIGURE_CONFIG or CMAKE_CONFIG: debug_configure = 0 # XXX use this to debug configure stuff. ./configure's generally hide our normal output including stderr so we write to a file use_clang = 1 # whether we fake configure tests using clang - the local, native compiler - or not. if not we generate JS and use node with a shebang # neither approach is perfect, you can try both, but may need to edit configure scripts in some cases # XXX False is not fully tested yet if debug_configure: tempout = '/tmp/emscripten_temp/out' if not os.path.exists(tempout): open(tempout, 'w').write('//\n') src = None for i in range(len(sys.argv)): if sys.argv[i].endswith('.c'): try: src = open(sys.argv[i]).read() if debug_configure: open(tempout, 'a').write('============= ' + sys.argv[i] + '\n' + src + '\n=============\n\n') except: pass if src: if 'fopen' in src and '"w"' in src: use_clang = True # we cannot write to files from js! if debug_configure: open(tempout, 'a').write('Forcing clang since uses fopen to write\n') compiler = os.environ.get('CONFIGURE_CC') or (shared.CLANG if use_clang else shared.EMCC) # if CONFIGURE_CC is defined, use that. let's you use local gcc etc. if you need that if not ('CXXCompiler' in ' '.join(sys.argv) or os.environ.get('EMMAKEN_CXX')): compiler = shared.to_cc(compiler) def filter_emscripten_options(argv): idx = 0 skip_next = False for el in argv: if skip_next: skip_next = False idx += 1 continue if el == '-s' and is_minus_s_for_emcc(argv, idx): skip_next = True else: yield el idx += 1 cmd = [compiler] + list(filter_emscripten_options(sys.argv[1:])) if use_clang: cmd += shared.EMSDK_OPTS + ['-DEMSCRIPTEN'] if DEBUG: print >> sys.stderr, 'emcc, just configuring: ', ' '.join(cmd) if debug_configure: open(tempout, 'a').write('emcc, just configuring: ' + ' '.join(cmd) + '\n\n') if use_clang: exit(subprocess.call(cmd)) else: only_object = '-c' in cmd target = None for i in range(len(cmd)-1): if cmd[i] == '-o': if not only_object: cmd[i+1] += '.js' target = cmd[i+1] break print 't1', target if not target: target = 'a.out.js' print 't2', target, only_object os.environ['EMMAKEN_JUST_CONFIGURE_RECURSE'] = '1' ret = subprocess.call(cmd) os.environ['EMMAKEN_JUST_CONFIGURE_RECURSE'] = '' if not os.path.exists(target): exit(1) if target.endswith('.js'): shutil.copyfile(target, target[:-3]) target = target[:-3] src = open(target).read() full_node = shared.NODE_JS if os.path.sep not in full_node: full_node = '/usr/bin/' + full_node # TODO: use whereis etc. And how about non-*NIX? open(target, 'w').write('#!' + full_node + '\n' + src) # add shebang import stat os.chmod(target, stat.S_IMODE(os.stat(target).st_mode) | stat.S_IXUSR) # make executable exit(ret) if os.environ.get('EMMAKEN_COMPILER'): CXX = os.environ['EMMAKEN_COMPILER'] else: CXX = shared.CLANG CC = shared.to_cc(CXX) # If we got here from a redirection through emmakenxx.py, then force a C++ compiler here if os.environ.get('EMMAKEN_CXX'): CC = CXX CC_ADDITIONAL_ARGS = shared.COMPILER_OPTS EMMAKEN_CFLAGS = os.environ.get('EMMAKEN_CFLAGS') if EMMAKEN_CFLAGS: CC_ADDITIONAL_ARGS += shlex.split(EMMAKEN_CFLAGS) # ---------------- Utilities --------------- SOURCE_SUFFIXES = ('.c', '.cpp', '.cxx', '.cc') BITCODE_SUFFIXES = ('.bc', '.o', '.obj') DYNAMICLIB_SUFFIXES = ('.dylib', '.so', '.dll') STATICLIB_SUFFIXES = ('.a',) ASSEMBLY_SUFFIXES = ('.ll',) LIB_PREFIXES = ('', 'lib') JS_CONTAINING_SUFFIXES = ('js', 'html') seen_names = {} def uniquename(name): if name not in seen_names: seen_names[name] = str(len(seen_names)) return unsuffixed(name) + '_' + seen_names[name] + (('.' + suffix(name)) if suffix(name) else '') # ---------------- End configs ------------- if len(sys.argv) == 1 or sys.argv[1] in ['x', 't']: # noop ar if DEBUG: print >> sys.stderr, 'emcc, just ar' sys.exit(0) use_cxx = True header = False # pre-compiled headers. We fake that by just copying the file for i in range(1, len(sys.argv)): arg = sys.argv[i] if not arg.startswith('-'): if arg.endswith('.c'): use_cxx = False if arg.endswith('.h') and sys.argv[i-1] != '-include': header = True if '-M' in sys.argv or '-MM' in sys.argv: # Just output dependencies, do not compile. Warning: clang and gcc behave differently with -MF! (clang seems to not recognize it) cmd = [CC] + shared.COMPILER_OPTS + sys.argv[1:] if DEBUG: print >> sys.stderr, 'emcc, just dependencies: ', ' '.join(cmd) exit(subprocess.call(cmd)) # Check if a target is specified target = None for i in range(len(sys.argv)-1): if sys.argv[i].startswith('-o='): raise Exception('Invalid syntax: do not use -o=X, use -o X') if sys.argv[i] == '-o': target = sys.argv[i+1] sys.argv = sys.argv[:i] + sys.argv[i+2:] break specified_target = target target = specified_target if specified_target is not None else 'a.out.js' # specified_target is the user-specified one, target is what we will generate target_basename = unsuffixed_basename(target) if '.' in target: final_suffix = target.split('.')[-1] else: final_suffix = '' if header: # header or such if len(sys.argv) >= 3: # if there is a source and a target, then copy, otherwise do nothing sys.argv = filter(lambda arg: not arg.startswith('-I'), sys.argv) if DEBUG: print >> sys.stderr, 'Just copy:', sys.argv[-1], target shutil.copy(sys.argv[-1], target) else: if DEBUG: print >> sys.stderr, 'No-op.' exit(0) if TEMP_DIR: temp_dir = TEMP_DIR if os.path.exists(temp_dir): shutil.rmtree(temp_dir) # clear it os.makedirs(temp_dir) else: temp_root = shared.TEMP_DIR if not os.path.exists(temp_root): os.makedirs(temp_root) temp_dir = tempfile.mkdtemp(dir=temp_root) def in_temp(name): return os.path.join(temp_dir, os.path.basename(name)) try: call = CXX if use_cxx else CC ## Parse args newargs = sys.argv[1:] opt_level = 0 llvm_opts = None llvm_lto = None closure = None js_transform = None pre_js = '' post_js = '' minify_whitespace = None split_js_file = None preload_files = [] embed_files = [] compression = None ignore_dynamic_linking = False shell_path = shared.path_from_root('src', 'shell.html') js_libraries = [] keep_llvm_debug = False keep_js_debug = False bind = False jcache = False if use_cxx: default_cxx_std = '-std=c++03' # Enforce a consistent C++ standard when compiling .cpp files, if user does not specify one on the cmdline. else: default_cxx_std = '' # Compiling C code with .c files, don't enforce a default C++ std. def check_bad_eq(arg): assert '=' not in arg, 'Invalid parameter (do not use "=" with "--" options)' absolute_warning_shown = False 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'): # Let -O default to -O2, which is what gcc does. requested_level = newargs[i][2:] or '2' if requested_level == 's': print >> sys.stderr, 'emcc: warning: -Os is ignored (use -O0, -O1, -O2)' else: try: opt_level = int(requested_level) assert 0 <= opt_level <= 3 except: raise Exception('Invalid optimization level: ' + newargs[i]) newargs[i] = '' elif newargs[i].startswith('--llvm-opts'): check_bad_eq(newargs[i]) llvm_opts = eval(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--llvm-lto'): check_bad_eq(newargs[i]) llvm_lto = eval(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--closure'): check_bad_eq(newargs[i]) closure = int(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--js-transform'): check_bad_eq(newargs[i]) js_transform = newargs[i+1] newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--pre-js'): check_bad_eq(newargs[i]) pre_js += open(newargs[i+1]).read() + '\n' newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--post-js'): check_bad_eq(newargs[i]) post_js += open(newargs[i+1]).read() + '\n' newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--minify'): check_bad_eq(newargs[i]) minify_whitespace = int(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--split'): check_bad_eq(newargs[i]) split_js_file = int(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' elif newargs[i] == '-g': keep_llvm_debug = True keep_js_debug = True elif newargs[i] == '--bind': bind = True newargs[i] = '' if default_cxx_std: default_cxx_std = '-std=c++11' # Force C++11 for embind code, but only if user has not explicitly overridden a standard. elif newargs[i].startswith('-std='): default_cxx_std = '' # User specified a standard to use, clear Emscripten from specifying it. elif newargs[i].startswith('--embed-file'): check_bad_eq(newargs[i]) embed_files.append(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--preload-file'): check_bad_eq(newargs[i]) preload_files.append(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--compression'): check_bad_eq(newargs[i]) parts = newargs[i+1].split(',') assert len(parts) == 3, '--compression requires specifying native_encoder,js_decoder,js_name - see emcc --help. got: %s' % newargs[i+1] Compression.encoder = parts[0] Compression.decoder = parts[1] Compression.js_name = parts[2] assert os.path.exists(Compression.encoder), 'native encoder %s does not exist' % Compression.encoder assert os.path.exists(Compression.decoder), 'js decoder %s does not exist' % Compression.decoder Compression.on = True newargs[i] = '' newargs[i+1] = '' elif newargs[i] == '--ignore-dynamic-linking': ignore_dynamic_linking = True newargs[i] = '' elif newargs[i] == '-v': shared.COMPILER_OPTS += ['-v'] DEBUG = 1 os.environ['EMCC_DEBUG'] = '1' # send to child processes too newargs[i] = '' elif newargs[i].startswith('--shell-file'): check_bad_eq(newargs[i]) shell_path = newargs[i+1] newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--js-library'): check_bad_eq(newargs[i]) js_libraries.append(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' elif newargs[i] == '--remove-duplicates': print >> sys.stderr, 'emcc: warning: --remove-duplicates is deprecated as it is no longer needed. If you cannot link without it, file a bug with a testcase' newargs[i] = '' elif newargs[i] == '--jcache': jcache = True newargs[i] = '' elif newargs[i] == '--clear-cache': newargs[i] = '' print >> sys.stderr, 'emcc: clearing cache' shared.Cache.erase() sys.exit(0) elif newargs[i].startswith(('-I/', '-L/')): if not absolute_warning_shown: print >> sys.stderr, 'emcc: warning: -I or -L of an absolute path encountered. If this is to a local system header/library, it may cause problems (local system files make sense for compiling natively on your system, but not necessarily to JavaScript)' # Of course an absolute path to a non-system-specific library or header is fine, and you can ignore this warning. The danger are system headers that are e.g. x86 specific and nonportable. The emscripten bundled headers are modified to be portable, local system ones are generally not absolute_warning_shown = True newargs = [ arg for arg in newargs if arg is not '' ] # If user did not specify a default -std for C++ code, specify the emscripten default. if default_cxx_std: newargs = newargs + [default_cxx_std] if llvm_opts is None: llvm_opts = LLVM_OPT_LEVEL[opt_level] if llvm_lto is None: llvm_lto = llvm_opts > 0 if opt_level <= 0: keep_llvm_debug = keep_js_debug = True # always keep debug in -O0 if opt_level > 0: keep_llvm_debug = False # JS optimizer wipes out llvm debug info from being visible if closure is None and opt_level == 3: closure = True if DEBUG: start_time = time.time() # done after parsing arguments, which might affect debug state if closure: assert os.path.exists(shared.CLOSURE_COMPILER), 'emcc: fatal: Closure compiler (%s) does not exist' % shared.CLOSURE_COMPILER settings_changes = [] for i in range(len(newargs)): if newargs[i] == '-s': if is_minus_s_for_emcc(newargs, i): settings_changes.append(newargs[i+1]) newargs[i] = newargs[i+1] = '' elif newargs[i].startswith('--typed-arrays'): assert '=' not in newargs[i], 'Invalid typed arrays parameter (do not use "=")' settings_changes.append('USE_TYPED_ARRAYS=' + newargs[i+1]) newargs[i] = '' newargs[i+1] = '' newargs = [ arg for arg in newargs if arg is not '' ] if split_js_file: settings_changes.append("PRINT_SPLIT_FILE_MARKER=1") # Find input files input_files = [] has_source_inputs = False lib_dirs = [shared.path_from_root('system', 'local', 'lib'), shared.path_from_root('system', 'lib')] libs = [] for i in range(len(newargs)): # find input files XXX this a simple heuristic. we should really analyze based on a full understanding of gcc params, # right now we just assume that what is left contains no more |-x OPT| things arg = newargs[i] if i > 0: prev = newargs[i-1] if prev in ['-MT', '-install_name', '-I', '-L']: continue # ignore this gcc-style argument if not arg.startswith('-') and (arg.endswith(SOURCE_SUFFIXES + BITCODE_SUFFIXES + DYNAMICLIB_SUFFIXES + ASSEMBLY_SUFFIXES) or shared.Building.is_ar(arg)): # we already removed -o , so all these should be inputs newargs[i] = '' if os.path.exists(arg): if arg.endswith(SOURCE_SUFFIXES): input_files.append(arg) has_source_inputs = True else: # this should be bitcode, make sure it is valid if arg.endswith(ASSEMBLY_SUFFIXES) or shared.Building.is_bitcode(arg): input_files.append(arg) elif arg.endswith(STATICLIB_SUFFIXES + DYNAMICLIB_SUFFIXES): # if it's not, and it's a library, just add it to libs to find later l = unsuffixed_basename(arg) for prefix in LIB_PREFIXES: if not prefix: continue if l.startswith(prefix): l = l[len(prefix):] break; libs.append(l) newargs[i] = '' else: print >> sys.stderr, 'emcc: %s: warning: Not valid LLVM bitcode' % arg else: print >> sys.stderr, 'emcc: %s: error: No such file or directory' % arg exit(1) elif arg.startswith('-L'): lib_dirs.append(arg[2:]) newargs[i] = '' elif arg.startswith('-l'): libs.append(arg[2:]) newargs[i] = '' original_input_files = input_files[:] newargs = [ arg for arg in newargs if arg is not '' ] # -c means do not link in gcc, and for us, the parallel is to not go all the way to JS, but stop at bitcode has_dash_c = '-c' in newargs if has_dash_c: assert has_source_inputs, 'Must have source code inputs to use -c' target = target_basename + '.o' final_suffix = 'o' # do not link in libs when just generating object code (not an 'executable', i.e. JS, or a library) if ('.' + final_suffix) in BITCODE_SUFFIXES and len(libs) > 0: print >> sys.stderr, 'emcc: warning: not linking against libraries since only compiling to bitcode' libs = [] # Find library files for lib in libs: if DEBUG: print >> sys.stderr, 'emcc: looking for library "%s"' % lib found = False for prefix in LIB_PREFIXES: for suff in STATICLIB_SUFFIXES + DYNAMICLIB_SUFFIXES: name = prefix + lib + suff for lib_dir in lib_dirs: path = os.path.join(lib_dir, name) if os.path.exists(path): if DEBUG: print >> sys.stderr, 'emcc: found library "%s" at %s' % (lib, path) input_files.append(path) found = True break if found: break if found: break if ignore_dynamic_linking: input_files = filter(lambda input_file: not input_file.endswith(DYNAMICLIB_SUFFIXES), input_files) if len(input_files) == 0: print >> sys.stderr, 'emcc: no input files' print >> sys.stderr, 'note that input files without a known suffix are ignored, make sure your input files end with one of: ' + str(SOURCE_SUFFIXES + BITCODE_SUFFIXES + DYNAMICLIB_SUFFIXES + STATICLIB_SUFFIXES + ASSEMBLY_SUFFIXES) exit(0) newargs += CC_ADDITIONAL_ARGS assert not (Compression.on and final_suffix != 'html'), 'Compression only works when generating HTML' # If we are using embind and generating JS, now is the time to link in bind.cpp if bind and final_suffix in JS_CONTAINING_SUFFIXES: input_files.append(shared.path_from_root('system', 'lib', 'embind', 'bind.cpp')) # Apply optimization level settings shared.Settings.apply_opt_level(opt_level, noisy=True) # Apply -s settings in newargs here (after optimization levels, so they can override them) for change in settings_changes: key, value = change.split('=') exec('shared.Settings.' + key + ' = ' + value) # Apply effects from settings if shared.Settings.ASM_JS: if closure: print >> sys.stderr, 'emcc: warning: disabling closure because it is not compatible with asm.js code generation' closure = False if shared.Settings.CORRECT_SIGNS != 1: print >> sys.stderr, 'emcc: warning: setting CORRECT_SIGNS to 1 for asm.js code generation' shared.Settings.CORRECT_SIGNS = 1 if shared.Settings.CORRECT_OVERFLOWS != 1: print >> sys.stderr, 'emcc: warning: setting CORRECT_OVERFLOWS to 1 for asm.js code generation' shared.Settings.CORRECT_OVERFLOWS = 1 if shared.Settings.CORRECT_SIGNS >= 2 or shared.Settings.CORRECT_OVERFLOWS >= 2 or shared.Settings.CORRECT_ROUNDINGS >= 2: keep_llvm_debug = True # must keep debug info to do line-by-line operations if (keep_llvm_debug or keep_js_debug) and closure: print >> sys.stderr, 'emcc: warning: disabling closure because debug info was requested' closure = False if minify_whitespace is None: minify_whitespace = closure # if closure is run, minify whitespace ## Compile source code to bitcode if DEBUG: print >> sys.stderr, 'emcc: compiling to bitcode' temp_files = [] # First, generate LLVM bitcode. For each input file, we get base.o with bitcode for input_file in input_files: if input_file.endswith(SOURCE_SUFFIXES): if DEBUG: print >> sys.stderr, 'emcc: compiling source file: ', input_file output_file = in_temp(unsuffixed(uniquename(input_file)) + '.o') temp_files.append(output_file) args = newargs + ['-emit-llvm', '-c', input_file, '-o', output_file] if DEBUG: print >> sys.stderr, "emcc running:", call, ' '.join(args) execute([call] + args) # let compiler frontend print directly, so colors are saved (PIPE kills that) if not os.path.exists(output_file): print >> sys.stderr, 'emcc: compiler frontend failed to generate LLVM bitcode, halting' sys.exit(1) else: # bitcode if input_file.endswith(BITCODE_SUFFIXES): if DEBUG: print >> sys.stderr, 'emcc: copying bitcode file: ', input_file temp_file = in_temp(unsuffixed(uniquename(input_file)) + '.o') shutil.copyfile(input_file, temp_file) temp_files.append(temp_file) elif input_file.endswith(DYNAMICLIB_SUFFIXES) or shared.Building.is_ar(input_file): if DEBUG: print >> sys.stderr, 'emcc: copying library file: ', input_file temp_file = in_temp(uniquename(input_file)) shutil.copyfile(input_file, temp_file) temp_files.append(temp_file) else: #.ll if not LEAVE_INPUTS_RAW: # Note that by assembling the .ll file, then disassembling it later, we will # remove annotations which is a good thing for compilation time if DEBUG: print >> sys.stderr, 'emcc: assembling assembly file: ', input_file temp_file = in_temp(unsuffixed(uniquename(input_file)) + '.o') 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 we were just asked to generate bitcode, stop there if final_suffix not in JS_CONTAINING_SUFFIXES: if llvm_opts > 0: print >> sys.stderr, 'emcc: warning: -Ox flags ignored, since not generating JavaScript' 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) else: if len(input_files) == 1: shutil.move(in_temp(unsuffixed(uniquename(input_files[0])) + '.o'), specified_target) else: assert len(original_input_files) == 1 or not has_dash_c, 'fatal error: cannot specify -o with -c with multiple files' + str(sys.argv) + ':' + str(original_input_files) # We have a specified target (-o ), which is not JavaScript or HTML, and # we have multiple files: Link them if DEBUG: print >> sys.stderr, 'emcc: link: ' + str(temp_files), specified_target shared.Building.link(temp_files, specified_target) exit(0) ## Continue on to create JavaScript if DEBUG: print >> sys.stderr, 'emcc: will generate JavaScript' extra_files_to_link = [] if not LEAVE_INPUTS_RAW and not AUTODEBUG and \ not shared.Settings.BUILD_AS_SHARED_LIB == 2: # shared lib 2 use the library in the parent # Check if we need to include some libraries that we compile. (We implement libc ourselves in js, but # compile a malloc implementation and stdlibc++.) # Note that we assume a single symbol is enough to know if we have/do not have dlmalloc etc. If you # include just a few symbols but want the rest, this will not work. # libc def create_libc(): if DEBUG: print >> sys.stderr, 'emcc: building libc for cache' o_s = [] for src in ['dlmalloc.c', os.path.join('libcxx', 'new.cpp')]: o = in_temp(os.path.basename(src) + '.o') execute([shared.PYTHON, shared.EMCC, shared.path_from_root('system', 'lib', src), '-o', o], stdout=stdout, stderr=stderr) o_s.append(o) shared.Building.link(o_s, in_temp('libc.bc')) return in_temp('libc.bc') def fix_libc(need): # libc needs some sign correction. # If we are in mode 0, switch to 2. We will add our lines try: if shared.Settings.CORRECT_SIGNS == 0: raise Exception('we need to change to 2') except: # we fail if equal to 0 - so we need to switch to 2 - or if CORRECT_SIGNS is not even in Settings shared.Settings.CORRECT_SIGNS = 2 if shared.Settings.CORRECT_SIGNS == 2: shared.Settings.CORRECT_SIGNS_LINES = [shared.path_from_root('src', 'dlmalloc.c') + ':' + str(i+4) for i in [4816, 4191, 4246, 4199, 4205, 4235, 4227]] # If we are in mode 1, we are correcting everything anyhow. If we are in mode 3, we will be corrected # so all is well anyhow too. # 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 = open(shared.path_from_root('system', 'lib', 'libc.symbols')).read().split('\n') # libcxx def create_libcxx(): if DEBUG: print >> sys.stderr, 'emcc: building libcxx for cache' os = [] for src in ['algorithm.cpp', 'condition_variable.cpp', 'future.cpp', 'iostream.cpp', 'memory.cpp', 'random.cpp', 'stdexcept.cpp', 'system_error.cpp', 'utility.cpp', 'bind.cpp', 'debug.cpp', 'hash.cpp', 'mutex.cpp', 'string.cpp', 'thread.cpp', 'valarray.cpp', 'chrono.cpp', 'exception.cpp', 'ios.cpp', 'locale.cpp', 'regex.cpp', 'strstream.cpp']: o = in_temp(src + '.o') execute([shared.PYTHON, shared.EMXX, shared.path_from_root('system', 'lib', 'libcxx', src), '-o', o], stdout=stdout, stderr=stderr) os.append(o) shared.Building.link(os, in_temp('libcxx.bc')) return in_temp('libcxx.bc') def fix_libcxx(need): assert shared.Settings.QUANTUM_SIZE == 4, 'We do not support libc++ with QUANTUM_SIZE == 1' # libcxx might need corrections, so turn them all on. TODO: check which are actually needed shared.Settings.CORRECT_SIGNS = shared.Settings.CORRECT_OVERFLOWS = shared.Settings.CORRECT_ROUNDINGS = 1 #print >> sys.stderr, 'emcc: info: using libcxx turns on CORRECT_* options' libcxx_symbols = map(lambda line: line.strip().split(' ')[1], open(shared.path_from_root('system', 'lib', 'libcxx', 'symbols')).readlines()) libcxx_symbols = filter(lambda symbol: symbol not in libc_symbols, libcxx_symbols) libcxx_symbols = set(libcxx_symbols) # libcxxabi - just for dynamic_cast for now def create_libcxxabi(): if DEBUG: print >> sys.stderr, 'emcc: building libcxxabi for cache' os = [] for src in ['private_typeinfo.cpp', 'typeinfo.cpp']: o = in_temp(src + '.o') execute([shared.PYTHON, shared.EMXX, shared.path_from_root('system', 'lib', 'libcxxabi', 'src', src), '-o', o], stdout=stdout, stderr=stderr) os.append(o) shared.Building.link(os, in_temp('libcxxabi.bc')) return in_temp('libcxxabi.bc') def fix_libcxxabi(need): assert shared.Settings.QUANTUM_SIZE == 4, 'We do not support libc++abi with QUANTUM_SIZE == 1' #print >> sys.stderr, 'emcc: info: using libcxxabi, this may need CORRECT_* options' #shared.Settings.CORRECT_SIGNS = shared.Settings.CORRECT_OVERFLOWS = shared.Settings.CORRECT_ROUNDINGS = 1 libcxxabi_symbols = map(lambda line: line.strip().split(' ')[1], open(shared.path_from_root('system', 'lib', 'libcxxabi', 'symbols')).readlines()) libcxxabi_symbols = filter(lambda symbol: symbol not in libc_symbols, libcxxabi_symbols) libcxxabi_symbols = set(libcxxabi_symbols) # If we have libcxx, we must force inclusion of libc, since libcxx uses new internally. Note: this is kind of hacky # Settings this in the environment will avoid checking dependencies and make building big projects a little faster force = os.environ.get('EMCC_FORCE_STDLIBS') has = need = None for name, create, fix, library_symbols in [('libcxx', create_libcxx, fix_libcxx, libcxx_symbols), ('libcxxabi', create_libcxxabi, fix_libcxxabi, libcxxabi_symbols), ('libc', create_libc, fix_libc, libc_symbols)]: if not force: need = set() has = set() for temp_file in temp_files: symbols = shared.Building.llvm_nm(temp_file) for library_symbol in library_symbols: if library_symbol in symbols.undefs: need.add(library_symbol) if library_symbol in symbols.defs: has.add(library_symbol) for haz in has: # remove symbols that are supplied by another of the inputs if haz in need: need.remove(haz) if DEBUG: print >> sys.stderr, 'emcc: considering including %s: we need %s and have %s' % (name, str(need), str(has)) if force or len(need) > 0: # We need to build and link the library in if DEBUG: print >> sys.stderr, 'emcc: including %s' % name libfile = shared.Cache.get(name, create) if has and len(has) > 0: # remove the symbols we do not need fixed = in_temp(uniquename(libfile)) + '.bc' shutil.copyfile(libfile, fixed) for haz in has: if DEBUG: print >> sys.stderr, 'emcc: including: removing symbol "%s" that we have' % haz shared.Building.remove_symbol(fixed, haz) libfile = fixed extra_files_to_link.append(libfile) force = True if fix and need: fix(need) # First, combine the bitcode files if there are several. We must also link if we have a singleton .a if len(input_files) + len(extra_files_to_link) > 1 or \ (not LEAVE_INPUTS_RAW and not (suffix(temp_files[0]) in BITCODE_SUFFIXES or suffix(temp_files[0]) in DYNAMICLIB_SUFFIXES) and shared.Building.is_ar(temp_files[0])): linker_inputs = temp_files + extra_files_to_link if DEBUG: print >> sys.stderr, 'emcc: linking: ', linker_inputs shared.Building.link(linker_inputs, in_temp(target_basename + '.bc')) final = in_temp(target_basename + '.bc') else: if not LEAVE_INPUTS_RAW: shutil.move(temp_files[0], in_temp(target_basename + '.bc')) final = in_temp(target_basename + '.bc') else: final = input_files[0] if DEBUG: print >> sys.stderr, 'emcc: saving intermediate processing steps to %s' % shared.EMSCRIPTEN_TEMP_DIR intermediate_counter = 0 intermediate_time = None def save_intermediate(name=None, suffix='js'): global intermediate_counter, intermediate_time shutil.copyfile(final, os.path.join(shared.EMSCRIPTEN_TEMP_DIR, 'emcc-%d%s.%s' % (intermediate_counter, '' if name is None else '-' + name, suffix))) intermediate_counter += 1 now = time.time() if intermediate_time: print >> sys.stderr, 'emcc: step took %.2f seconds' % (now - intermediate_time) intermediate_time = now if not LEAVE_INPUTS_RAW: save_intermediate('basebc', 'bc') # Optimize, if asked to if not LEAVE_INPUTS_RAW: link_opts = [] if keep_llvm_debug else ['-strip-debug'] # remove LLVM debug info in -O1+, since the optimizer removes it anyhow if llvm_opts > 0: 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) 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 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'] else: # At minimum remove dead functions etc., this potentially saves a lot in the size of the generated code (and the time to compile it) link_opts += shared.Building.get_safe_internalize() + ['-globaldce'] shared.Building.llvm_opt(in_temp(target_basename + '.bc'), link_opts) if DEBUG: save_intermediate('linktime', 'bc') # Prepare .ll for Emscripten if not LEAVE_INPUTS_RAW: final = shared.Building.llvm_dis(final, final + '.ll') else: assert len(input_files) == 1 if DEBUG: save_intermediate('ll', 'll') if AUTODEBUG: if DEBUG: print >> sys.stderr, 'emcc: autodebug' execute([shared.PYTHON, shared.AUTODEBUGGER, final, final + '.ad.ll']) final += '.ad.ll' if DEBUG: save_intermediate('autodebug', 'll') # Emscripten if DEBUG: print >> sys.stderr, 'emcc: LLVM => JS' extra_args = [] if not js_libraries else ['--libraries', ','.join(map(os.path.abspath, js_libraries))] if jcache: extra_args.append('--jcache') final = shared.Building.emscripten(final, append_ext=False, extra_args=extra_args) if DEBUG: save_intermediate('original') # Embed and preload files if len(preload_files) + len(embed_files) > 0: if DEBUG: print >> sys.stderr, 'emcc: setting up files' file_args = [] if len(preload_files) > 0: file_args.append('--preload') file_args += preload_files if len(embed_files) > 0: file_args.append('--embed') file_args += embed_files if Compression.on: file_args += ['--compress', Compression.encoder, Compression.decoder, Compression.js_name] code = execute([shared.PYTHON, shared.FILE_PACKAGER, unsuffixed(target) + '.data'] + file_args, stdout=PIPE)[0] src = open(final).read().replace('// {{PRE_RUN_ADDITIONS}}', '// {{PRE_RUN_ADDITIONS}}\n' + code) final += '.files.js' open(final, 'w').write(src) if DEBUG: save_intermediate('files') # Apply pre and postjs files if pre_js or post_js: if DEBUG: print >> sys.stderr, 'emcc: applying pre/postjses' src = open(final).read() final += '.pp.js' open(final, 'w').write(pre_js + src + post_js) if DEBUG: save_intermediate('pre-post') # Add bindings glue if used if bind: if DEBUG: print >> sys.stderr, 'emcc: adding embind glue' src = open(final).read().replace('// {{PRE_RUN_ADDITIONS}}', '// {{PRE_RUN_ADDITIONS}}\n' + open(shared.path_from_root('src', 'embind', 'embind.js')).read() + open(shared.path_from_root('src', 'embind', 'emval.js')).read() ) final += '.bd.js' open(final, 'w').write(src) if DEBUG: save_intermediate('bind') # Apply a source code transformation, if requested if js_transform: shutil.copyfile(final, final + '.tr.js') final += '.tr.js' posix = True if not shared.WINDOWS else False if DEBUG: print >> sys.stderr, 'emcc: applying transform: %s' % js_transform execute(shlex.split(js_transform, posix=posix) + [os.path.abspath(final)]) if DEBUG: save_intermediate('transformed') if shared.Settings.ASM_JS: # XXX temporary wrapping for testing purposes print >> sys.stderr, 'emcc: ASM_JS mode is highly experimental, and will not work on most codebases yet. It is NOT recommended that you try this yet.' # It is useful to run several js optimizer passes together, to save on unneeded unparsing/reparsing js_optimizer_queue = [] def flush_js_optimizer_queue(): global final, js_optimizer_queue if len(js_optimizer_queue) > 0 and not(len(js_optimizer_queue) == 1 and js_optimizer_queue[0] == 'last'): if DEBUG < 2: if shared.Settings.ASM_JS: js_optimizer_queue = ['asm'] + js_optimizer_queue if DEBUG: print >> sys.stderr, 'emcc: applying js optimization passes:', js_optimizer_queue final = shared.Building.js_optimizer(final, js_optimizer_queue, jcache) if DEBUG: save_intermediate('js_opts') else: for name in js_optimizer_queue: passes = [name] if shared.Settings.ASM_JS: passes = ['asm'] + passes print >> sys.stderr, 'emcc: applying js optimization pass:', passes final = shared.Building.js_optimizer(final, passes, jcache) save_intermediate(name) js_optimizer_queue = [] if opt_level >= 1: if DEBUG: print >> sys.stderr, 'emcc: running pre-closure post-opts' if DEBUG >= 2: # Clean up the syntax a bit final = shared.Building.js_optimizer(final, [], jcache) if DEBUG: save_intermediate('pretty') def get_eliminate(): if shared.Settings.ALLOW_MEMORY_GROWTH: return 'eliminateMemSafe' else: return 'eliminate' js_optimizer_queue += [get_eliminate(), 'simplifyExpressionsPre'] if shared.Settings.RELOOP and not shared.Settings.ASM_JS: js_optimizer_queue += ['optimizeShiftsAggressive', get_eliminate()] # aggressive shifts optimization requires loops, it breaks on switches if closure: flush_js_optimizer_queue() if DEBUG: print >> sys.stderr, 'emcc: running closure' final = shared.Building.closure_compiler(final) if DEBUG: save_intermediate('closure') elif shared.Settings.RELOOP and not closure and not keep_js_debug: # do this if closure is not enabled (it gives similar speedups), and we do not need to keep debug info around js_optimizer_queue += ['registerize'] if opt_level >= 1: if DEBUG: print >> sys.stderr, 'emcc: running post-closure post-opts' js_optimizer_queue += ['simplifyExpressionsPost'] if minify_whitespace: js_optimizer_queue += ['compress'] js_optimizer_queue += ['last'] flush_js_optimizer_queue() # If we were asked to also generate HTML, do that if final_suffix == 'html': if DEBUG: print >> sys.stderr, 'emcc: generating HTML' shell = open(shell_path).read() html = open(target, 'w') if not Compression.on: html.write(shell.replace('{{{ SCRIPT_CODE }}}', open(final).read())) else: # Compress the main code js_target = unsuffixed(target) + '.js' shutil.move(final, js_target) Compression.compress(js_target) # Run the decompressor in a worker, and add code to # 1. download the compressed file # 2. decompress to a typed array # 3. convert to a string of source code # 4. insert a script element with that source code (more effective than eval) decoding = ''' var decompressWorker = new Worker('decompress.js'); var decompressCallbacks = []; var decompressions = 0; Module["decompress"] = function(data, callback) { var id = decompressCallbacks.length; decompressCallbacks.push(callback); decompressWorker.postMessage({ data: data, id: id }); if (Module['setStatus']) { decompressions++; Module['setStatus']('Decompressing...'); } }; decompressWorker.onmessage = function(event) { decompressCallbacks[event.data.id](event.data.data); decompressCallbacks[event.data.id] = null; if (Module['setStatus']) { decompressions--; if (decompressions == 0) { Module['setStatus'](''); } } }; var compiledCodeXHR = new XMLHttpRequest(); compiledCodeXHR.open('GET', '%s', true); compiledCodeXHR.responseType = 'arraybuffer'; compiledCodeXHR.onload = function() { var arrayBuffer = compiledCodeXHR.response; if (!arrayBuffer) throw('Loading compressed code failed.'); var byteArray = new Uint8Array(arrayBuffer); Module.decompress(byteArray, function(decompressed) { var source = Array.prototype.slice.apply(decompressed).map(function(x) { return String.fromCharCode(x) }).join(''); // createObjectURL instead? var scriptTag = document.createElement('script'); scriptTag.setAttribute('type', 'text/javascript'); scriptTag.innerHTML = source; document.body.appendChild(scriptTag); }); }; compiledCodeXHR.send(null); ''' % Compression.compressed_name(js_target) html.write(shell.replace('{{{ SCRIPT_CODE }}}', decoding)) # Add decompressor with web worker glue code decompressor = open('decompress.js', 'w') decompressor.write(open(Compression.decoder).read()) decompressor.write(''' onmessage = function(event) { postMessage({ data: %s(event.data.data), id: event.data.id }); }; ''' % Compression.js_name) decompressor.close() html.close() else: if split_js_file: from tools.split import split_javascript_file split_javascript_file(final, unsuffixed(target), split_js_file) else: # copy final JS to output shutil.move(final, target) if DEBUG: print >> sys.stderr, 'emcc: total time: %.2f seconds' % (time.time() - start_time) finally: if not TEMP_DIR: try: shutil.rmtree(temp_dir) except: pass else: print >> sys.stderr, 'emcc saved files are in:', temp_dir