#!/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. 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, re, logging, json from subprocess import PIPE, STDOUT from tools import shared, jsrun, system_libs from tools.shared import Compression, execute, suffix, unsuffixed, unsuffixed_basename, WINDOWS from tools.response_file import read_response_file # endings = dot + a suffix, safe to test by filename.endswith(endings) C_ENDINGS = ('.c', '.C') CXX_ENDINGS = ('.cpp', '.cxx', '.cc', '.CPP', '.CXX', '.CC') OBJC_ENDINGS = ('.m',) OBJCXX_ENDINGS = ('.mm',) SOURCE_ENDINGS = C_ENDINGS + CXX_ENDINGS + OBJC_ENDINGS + OBJCXX_ENDINGS BITCODE_ENDINGS = ('.bc', '.o', '.obj') DYNAMICLIB_ENDINGS = ('.dylib', '.so', '.dll') STATICLIB_ENDINGS = ('.a',) ASSEMBLY_ENDINGS = ('.ll',) HEADER_ENDINGS = ('.h', '.hxx', '.hpp', '.hh', '.H', '.HXX', '.HPP', '.HH') LIB_PREFIXES = ('', 'lib') JS_CONTAINING_SUFFIXES = ('js', 'html') # 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 = os.environ.get('EMCC_DEBUG') if DEBUG == "0": DEBUG = None 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 logging.debug('invocation: ' + ' '.join(sys.argv) + (' + ' + EMCC_CFLAGS if EMCC_CFLAGS else '')) if EMCC_CFLAGS: sys.argv.append(EMCC_CFLAGS) if DEBUG and LEAVE_INPUTS_RAW: logging.warning('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: logging.warning('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 response_file = True extra_args = read_response_file(sys.argv[index]) # slice in extra_args in place of the response file arg sys.argv[index:index+1] = extra_args break if len(sys.argv) == 1 or '--help' in sys.argv: 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). This is the recommended setting for starting to port a project, as it includes various assertions. -O1 Simple optimizations, including asm.js, LLVM -O1 optimizations, relooping, and no runtime assertions or C++ exception catching (to re-enable C++ exception catching, use -s DISABLE_EXCEPTION_CATCHING=0 ), and enables -s ALIASING_FUNCTION_POINTERS=1 This is the recommended setting when you want a reasonably optimized build that is generated as quickly as possible (it builds much faster than -O2). (Note: for details on the affects of different opt levels, see apply_opt_level() in tools/shared.py and also src/settings.js.) -O2 As -O1, plus various js-level optimizations and LLVM -O3 optimizations. This is the recommended setting for a release build: slower compilation time in return for the smallest and fastest output. -O3 As -O2, plus additional optimizations that can take a significant amount of compilation time and/or are relatively new. For tips on optimizing your code, see https://github.com/kripken/emscripten/wiki/Optimizing-Code -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) You can also specify a file from which the value would be read, for example, -s DEAD_FUNCTIONS=@/path/to/file The contents of /path/to/file will be read, JSON.parsed and set into DEAD_FUNCTIONS (so the file could contain ["_func1", "func2"] ). Note that the path must be absolute, not relative. -g Use debug info. When compiling to bitcode, this is the same as in clang and gcc, it adds debug info to the object files. When compiling from source to JS or bitcode to JS, it is equivalent to -g3 (keep code as debuggable as possible, except for discarding LLVM debug info, so no C/C++ line numbers; use -g4 to get line number debugging info in JS). -g When compiling from bitcode to JS, we can keep the code debuggable to different degrees. Each of these levels builds on the previous: -g0 Make no effort to keep code debuggable. Will discard LLVM debug info. (default in -O1+) -g1 Preserve (do not minify) whitespace -g2 Preserve function names -g3 Preserve variable names -g4 Preserve LLVM debug info (if -g was 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 0: No typed arrays 1: Parallel typed arrays 2: Shared (C-like) typed arrays (default) --js-opts 0: Prevent JS optimizer from running 1: Use JS optimizer (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+) You can also specify arbitrary LLVM options, e.g. --llvm-opts "['-O3', '-somethingelse']" --llvm-lto 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 has no effect. Note that LLVM LTO is not perfectly stable yet, and can can cause code to behave incorrectly. --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. In asm.js mode, closure will only be used on the 'shell' code around the compiled code (the compiled code will be processed by the custom asm.js minifier). Note: If closure compiler hits an out-of-memory, try adjusting JAVA_HEAP_SIZE in the environment (for example, to 4096m for 4GB). Note: Closure is only run if js opts are being done (-O2 or above, or --js-opts 1). --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. Note: Embedding files is much less efficient than preloading them. You should only use it for small amounts of small files. Instead, use --preload-file which emits efficient binary data. --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). For more docs on the options --preload-file accepts, see https://github.com/kripken/emscripten/wiki/Filesystem-Guide --exclude-file Files and directories to be excluded from --embed-file and --preload-file wildcard is supported --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 }}} (see src/shell.html and src/shell_minimal.html for examples) Note that this argument is ignored if a target other than HTML is specified using the -o option. --compression **THIS OPTION IS DEPRECATED** 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 Identical to -g1 --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. --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". Note: this option is deprecated (modern JS debuggers should work ok even on large files) --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. --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. Caching works separately on 4 parts of compilation: 'pre' which is types and global variables; that information is then fed into 'funcs' which are the functions (which we parallelize), and then 'post' which adds final information based on the functions (e.g., do we need long64 support code). Finally, 'jsfuncs' are JavaScript-level optimizations. Each of the 4 parts can be cached separately, but note that they can affect each other: If you recompile a single C++ file that changes a global variable - e.g., adds, removes or modifies a global variable, say by adding a printf or by adding a compile-time timestamp, then 'pre' cannot be loaded from the cache. And since 'pre's output is sent to 'funcs' and 'post', they will get invalidated as well, and only 'jsfuncs' will be cached. So avoid modifying globals to let caching work fully. To work around the problem mentioned in the previous paragraph, you can use emscripten_jcache_printf when adding debug printfs to your code. That function is specially preprocessed so that it does not create a constant string global for its first argument. See emscripten.h for more details. Note in particular that you need to already have a call to that function in your code *before* you add one and do an incremental build, so that adding an external reference (also a global property) does not invalidate everything. Note that you should use -g during the linking stage (bitcode to JS), for jcache to work (otherwise, JS minification can confuse it). --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. --save-bc PATH When compiling to JavaScript or HTML, this option will save a copy of the bitcode to the specified path. The bitcode will include all files being linked, including standard libraries, and after any link-time optimizations (if any). --memory-init-file 0: Do not emit a separate memory initialization file, keep the static initialization inside the generated JavaScript as text (default) 1: Emit a separate memory initialization file in binary format. This is more efficient than storing it as text inside JavaScript, but does mean you have another file to publish. -Wno-warn-absolute-paths If not specified, the compiler will warn about any uses of absolute paths in -I and -L command line directives. Pass this flag on the command line to hide these warnings and acknowledge that the explicit use of absolute paths is intentional. --proxy-to-worker Generates both html and js files. The main program is in js, and the html proxies to/from it. --emrun Enables the generated output to be aware of the emrun command line tool. This allows stdout, stderr and exit(returncode) capture when running the generated application through emrun. --em-config Specifies the location of the .emscripten configuration file for the current compiler run. If not specified, the environment variable EM_CONFIG is read for this file, and if that is not set, the default location ~/.emscripten is assumed. --default-obj-ext .ext Specifies the file suffix to generate if the location of a directory name is passed to -o directive, e.g. emcc -c a.c -o dir/ will by default generate an output name 'dir/a.o', but this cmdline param can be passed to generate a file with a custom suffix 'dir/a.ext'. The target file, if specified (-o ), defines what will be generated: .js JavaScript .html HTML + side JavaScript file (.js) (JS on the side improves page load time) .bc LLVM bitcode (default) .o LLVM bitcode (same as .bc) (Note that if --memory-init-file is used, then in addition to a .js or .html file that is generated, a .mem file will also appear.) 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 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 len(sys.argv) == 2 and sys.argv[1] == '-v': # -v with no inputs print 'emcc (Emscripten GCC-like replacement + linker emulating GNU ld ) %s' % shared.EMSCRIPTEN_VERSION 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: logging.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_js = os.environ.get('EMCONFIGURE_JS') # 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 arg in sys.argv: if arg.endswith('.c'): try: src = open(arg).read() if debug_configure: open(tempout, 'a').write('============= ' + arg + '\n' + src + '\n=============\n\n') except: pass elif arg.endswith('.s'): if debug_configure: open(tempout, 'a').write('(compiling .s assembly, must use clang\n') use_js = 0 elif arg == '-E': use_js = 0 if src: if 'fopen' in src and '"w"' in src: use_js = 0 # 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 not use_js 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 not use_js and el == '-s' and is_minus_s_for_emcc(argv, idx): # skip -s X=Y if not using js for configure skip_next = True else: yield el idx += 1 cmd = [compiler] + list(filter_emscripten_options(sys.argv[1:])) if not use_js: cmd += shared.EMSDK_OPTS + ['-DEMSCRIPTEN'] if use_js: cmd += ['-s', 'ERROR_ON_UNDEFINED_SYMBOLS=1'] # configure tests should fail when an undefined symbol exists logging.debug('just configuring: ' + ' '.join(cmd)) if debug_configure: open(tempout, 'a').write('emcc, just configuring: ' + ' '.join(cmd) + '\n\n') if not use_js: 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 = ' '.join(shared.listify(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: sys.argv += shlex.split(EMMAKEN_CFLAGS) # ---------------- Utilities --------------- 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 logging.debug('just ar') sys.exit(0) use_cxx = True for i in range(1, len(sys.argv)): arg = sys.argv[i] if not arg.startswith('-'): if arg.endswith(C_ENDINGS + OBJC_ENDINGS): use_cxx = False 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:] logging.debug('just dependencies: ' + ' '.join(cmd)) exit(subprocess.call(cmd)) if '-E' in sys.argv: # Just run the preprocessor cmd = [CC] + sys.argv[1:] logging.debug('just preprocessor ' + ' '.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 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)) # Parses the essential suffix of a filename, discarding Unix-style version numbers in the name. For example for 'libz.so.1.2.8' returns '.so' def filename_type_suffix(filename): for i in reversed(filename.split('.')[1:]): if not i.isdigit(): return i return '' def filename_type_ending(filename): suffix = filename_type_suffix(filename) return '' if not suffix else ('.' + suffix) # Log out times for emcc stages log_time_last = time.time() def log_time(name): global log_time_last now = time.time() logging.debug('emcc step "%s" took %.2f seconds' % (name, now - log_time_last)) log_time_last = now try: call = CXX if use_cxx else CC ## Parse args newargs = sys.argv[1:] opt_level = 0 debug_level = 0 js_opts = None llvm_opts = None llvm_lto = None closure = None js_transform = None pre_js = '' post_js = '' split_js_file = None preload_files = [] embed_files = [] exclude_files = [] compression = None ignore_dynamic_linking = False shell_path = shared.path_from_root('src', 'shell.html') js_libraries = [] bind = False emrun = False jcache = False save_bc = False memory_init_file = False use_preload_cache = False no_heap_copy = False proxy_to_worker = False default_object_extension = '.o' 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 # Scan for warning suppression message in advance from other cmdline flags, so that it works even if -I or -L directives are present before this. for i in range(len(newargs)): if newargs[i] == '-Wno-warn-absolute-paths': newargs[i] = '' absolute_warning_shown = True 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'): # Let -O default to -O2, which is what gcc does. requested_level = newargs[i][2:] or '2' if requested_level == 's': requested_level = 2 settings_changes.append('INLINING_LIMIT=50') opt_level = validate_arg_level(requested_level, 3, 'Invalid optimization level: ' + newargs[i]) # We leave the -O option in place so that the clang front-end runs in that # optimization mode, but we disable the actual optimization passes, as we'll # run them seperately. newargs.append('-mllvm') newargs.append('-disable-llvm-optzns'); elif newargs[i].startswith('--js-opts'): check_bad_eq(newargs[i]) js_opts = eval(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' 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]) assert newargs[i+1] == '0', '0 is the only supported option for --minify; 1 has been deprecated' debug_level = max(1, debug_level) 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].startswith('-g'): requested_level = newargs[i][2:] or '3' 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] = '' 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('--exclude-file'): check_bad_eq(newargs[i]) exclude_files.append(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' elif newargs[i].startswith('--compression'): logging.warning('--compression is deprecated. Instead, it is recommended you use native gzip compression in your webserver') 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] def locate(tool): if WINDOWS: if os.path.exists(tool+'.exe'): return tool+'.exe' if os.path.exists(tool+'.bat'): return tool+'.bat' if os.path.exists(tool+'.cmd'): return tool+'.cmd' return tool Compression.encoder = locate(parts[0]) Compression.decoder = locate(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].startswith('--use-preload-cache'): use_preload_cache = True newargs[i] = '' elif newargs[i].startswith('--no-heap-copy'): no_heap_copy = True newargs[i] = '' elif newargs[i] == '--ignore-dynamic-linking': ignore_dynamic_linking = True newargs[i] = '' elif newargs[i] == '-v': shared.COMPILER_OPTS += ['-v'] os.environ['EMCC_DEBUG'] = '1' # send to child processes too if DEBUG != 1: # swap in debug logging DEBUG = 1 shared.set_logging() logging.debug('invocation: ' + ' '.join(sys.argv)) shared.apply_configuration() # reset config to pick up change 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': logging.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] = '' logging.warning('clearing cache') shared.Cache.erase() sys.exit(0) elif newargs[i] == '--save-bc': check_bad_eq(newargs[i]) save_bc = newargs[i+1] newargs[i] = '' newargs[i+1] = '' elif newargs[i] == '--memory-init-file': check_bad_eq(newargs[i]) memory_init_file = int(newargs[i+1]) newargs[i] = '' newargs[i+1] = '' elif newargs[i] == '--proxy-to-worker': proxy_to_worker = True newargs[i] = '' elif newargs[i].startswith(('-I', '-L')): path_name = newargs[i][2:] if not absolute_warning_shown and os.path.isabs(path_name): logging.warning ('-I or -L of an absolute path "' + newargs[i] + '" 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). Pass \'-Wno-warn-absolute-paths\' to emcc to hide this warning.') # 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 elif newargs[i] == '--emrun': emrun = True newargs[i] = '' elif newargs[i] == '--em-config': # This option is parsed in tools/shared.py, here only clean it up from being passed to clang. newargs[i] = '' newargs[i+1] = '' elif newargs[i] == '--default-obj-ext': newargs[i] = '' default_object_extension = newargs[i+1] if not default_object_extension.startswith('.'): default_object_extension = '.' + default_object_extension newargs[i+1] = '' 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 emrun: pre_js += open(shared.path_from_root('src', 'emrun_prejs.js')).read() + '\n' post_js += open(shared.path_from_root('src', 'emrun_postjs.js')).read() + '\n' if js_opts is None: js_opts = opt_level >= 2 if llvm_opts is None: llvm_opts = LLVM_OPT_LEVEL[opt_level] if opt_level == 0: debug_level = 4 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: assert os.path.exists(shared.CLOSURE_COMPILER), logging.error('fatal: Closure compiler (%s) does not exist' % shared.CLOSURE_COMPILER) 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 has_header_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', '-MF', '-MQ', '-D', '-U', '-o', '-x', '-Xpreprocessor', '-include', '-imacros', '-idirafter', '-iprefix', '-iwithprefix', '-iwithprefixbefore', '-isysroot', '-imultilib', '-A', '-isystem', '-iquote', '-install_name', '-compatibility_version', '-current_version', '-I', '-L']: continue # ignore this gcc-style argument if (os.path.islink(arg) and os.path.realpath(arg).endswith(SOURCE_ENDINGS + BITCODE_ENDINGS + DYNAMICLIB_ENDINGS + ASSEMBLY_ENDINGS + HEADER_ENDINGS)): arg = os.path.realpath(arg) if not arg.startswith('-'): if not os.path.exists(arg): logging.error('%s: No such file or directory ("%s" was expected to be an input file, based on the commandline arguments provided)' % (arg, arg)) exit(1) arg_ending = filename_type_ending(arg) if arg_ending.endswith(SOURCE_ENDINGS + BITCODE_ENDINGS + DYNAMICLIB_ENDINGS + ASSEMBLY_ENDINGS + HEADER_ENDINGS) or shared.Building.is_ar(arg): # we already removed -o , so all these should be inputs newargs[i] = '' if arg_ending.endswith(SOURCE_ENDINGS): input_files.append(arg) has_source_inputs = True elif arg_ending.endswith(HEADER_ENDINGS): input_files.append(arg) has_header_inputs = True elif arg_ending.endswith(ASSEMBLY_ENDINGS) or shared.Building.is_bitcode(arg): # this should be bitcode, make sure it is valid input_files.append(arg) elif arg_ending.endswith(STATICLIB_ENDINGS + DYNAMICLIB_ENDINGS): # 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: logging.warning(arg + ' is not valid LLVM bitcode') elif arg_ending.endswith(STATICLIB_ENDINGS): if not shared.Building.is_ar(arg): if shared.Building.is_bitcode(arg): logging.error(arg + ': File has a suffix of a static library ' + str(STATICLIB_ENDINGS) + ', but instead is an LLVM bitcode file! When linking LLVM bitcode files, use one of the suffixes ' + str(BITCODE_ENDINGS)) else: logging.error(arg + ': Unknown format, not a static library!') exit(1) else: logging.error(arg + ": Input file has an unknown suffix, don't know what to do with it!") 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 or has_header_inputs, 'Must have source code or header inputs to use -c' target = target_basename + '.o' final_suffix = 'o' # Find library files for lib in libs: logging.debug('looking for library "%s"' % lib) found = False for prefix in LIB_PREFIXES: for suff in STATICLIB_ENDINGS + DYNAMICLIB_ENDINGS: name = prefix + lib + suff for lib_dir in lib_dirs: path = os.path.join(lib_dir, name) if os.path.exists(path): logging.debug('found library "%s" at %s' % (lib, path)) input_files.append(path) found = True break if found: break if found: break if not found: logging.warning('emcc: cannot find library "%s"' % lib) # If not compiling to JS, then we are compiling to an intermediate bitcode objects or library, so # ignore dynamic linking, since multiple dynamic linkings can interfere with each other if not filename_type_suffix(target) in JS_CONTAINING_SUFFIXES or ignore_dynamic_linking: def check(input_file): if filename_type_ending(input_file) in DYNAMICLIB_ENDINGS: if not ignore_dynamic_linking: logging.warning('ignoring dynamic library %s because not compiling to JS or HTML, remember to link it when compiling to JS or HTML at the end' % os.path.basename(input_file)) return False else: return True input_files = filter(lambda input_file: check(input_file), input_files) if len(input_files) == 0: logging.error('no input files\nnote that input files without a known suffix are ignored, make sure your input files end with one of: ' + str(SOURCE_ENDINGS + BITCODE_ENDINGS + DYNAMICLIB_ENDINGS + STATICLIB_ENDINGS + ASSEMBLY_ENDINGS + HEADER_ENDINGS)) exit(0) newargs = CC_ADDITIONAL_ARGS + newargs 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('=') if value[0] == '@': value = '"@' + os.path.abspath(value[1:]) + '"' value = value.replace('\\\\', '/').replace('\\', '/') # Convert backslash paths to forward slashes on Windows as well, since the JS compiler otherwise needs the backslashes escaped (alternative is to escape all input paths passing to JS, which feels clumsier to read) exec('shared.Settings.' + key + ' = ' + value) # Apply effects from settings if bind and shared.Settings.ASM_JS: logging.warning('disabling asm.js since embind is not ready for it yet') shared.Settings.ASM_JS = 0 fastcomp = os.environ.get('EMCC_FAST_COMPILER') == '1' if fastcomp: shared.Settings.ASM_JS = 1 if opt_level > 0 else 2 assert shared.Settings.ALLOW_MEMORY_GROWTH == 0, 'memory growth not supported in fastcomp yet' assert shared.Settings.UNALIGNED_MEMORY == 0, 'forced unaligned memory not supported in fastcomp' assert shared.Settings.CHECK_HEAP_ALIGN == 0, 'check heap align not supported in fastcomp yet' assert shared.Settings.SAFE_DYNCALLS == 0, 'safe dyncalls not supported in fastcomp' assert shared.Settings.RESERVED_FUNCTION_POINTERS == 0, 'reserved function pointers not supported in fastcomp' assert shared.Settings.ASM_HEAP_LOG == 0, 'asm heap log not supported in fastcomp' assert shared.Settings.LABEL_DEBUG == 0, 'label debug not supported in fastcomp' assert shared.Settings.EXECUTION_TIMEOUT == -1, 'execution timeout not supported in fastcomp' assert shared.Settings.NAMED_GLOBALS == 0, 'named globals not supported in fastcomp' assert shared.Settings.PGO == 0, 'pgo not supported in fastcomp' assert shared.Settings.TARGET_LE32 == 1, 'fastcomp requires le32' assert shared.Settings.USE_TYPED_ARRAYS == 2, 'fastcomp assumes ta2' assert not split_js_file, '--split-js is deprecated and not supported in fastcomp' assert not bind, 'embind not supported in fastcomp yet' if jcache: logging.warning('jcache is not supported in fastcomp (you should not need it anyhow), disabling') jcache = False fastcomp_opts = ['-pnacl-abi-simplify-preopt', '-pnacl-abi-simplify-postopt'] if shared.Settings.DISABLE_EXCEPTION_CATCHING != 1: fastcomp_opts += ['-enable-emscripten-cxx-exceptions'] if len(shared.Settings.EXCEPTION_CATCHING_WHITELIST) > 0: fastcomp_opts += ['-emscripten-cxx-exceptions-whitelist=' + ','.join(shared.Settings.EXCEPTION_CATCHING_WHITELIST)] if shared.Settings.ASM_JS: assert opt_level >= 1 or fastcomp, 'asm.js requires -O1 or above' if bind: shared.Settings.RESERVED_FUNCTION_POINTERS = max(shared.Settings.RESERVED_FUNCTION_POINTERS, 10) if shared.Settings.CORRECT_SIGNS != 1: logging.warning('setting CORRECT_SIGNS to 1 for asm.js code generation') shared.Settings.CORRECT_SIGNS = 1 if shared.Settings.CORRECT_OVERFLOWS != 1: logging.warning('setting CORRECT_OVERFLOWS to 1 for asm.js code generation') shared.Settings.CORRECT_OVERFLOWS = 1 assert not shared.Settings.PGO, 'cannot run PGO in ASM_JS mode' if shared.Settings.SAFE_HEAP and not js_opts: js_opts = True logging.warning('enabling js opts to allow SAFE_HEAP to work properly') if shared.Settings.ALLOW_MEMORY_GROWTH: logging.error('Cannot enable ALLOW_MEMORY_GROWTH with asm.js, build with -s ASM_JS=0 if you need a growable heap'); sys.exit(1); if shared.Settings.CORRECT_SIGNS >= 2 or shared.Settings.CORRECT_OVERFLOWS >= 2 or shared.Settings.CORRECT_ROUNDINGS >= 2: debug_level = 4 # must keep debug info to do line-by-line operations if debug_level > 1 and closure: logging.warning('disabling closure because debug info was requested') closure = False assert shared.LLVM_TARGET in shared.COMPILER_OPTS if shared.LLVM_TARGET == 'i386-pc-linux-gnu': shared.Settings.TARGET_X86 = 1 shared.Settings.TARGET_LE32 = 0 assert 'le32-unknown-nacl' not in shared.COMPILER_OPTS elif shared.LLVM_TARGET == 'le32-unknown-nacl': shared.Settings.TARGET_LE32 = 1 shared.Settings.TARGET_X86 = 0 assert 'i386-pc-linux-gnu' not in shared.COMPILER_OPTS 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 if shared.Settings.MAIN_MODULE: assert not shared.Settings.SIDE_MODULE shared.Settings.INCLUDE_FULL_LIBRARY = 1 elif shared.Settings.SIDE_MODULE: assert not shared.Settings.MAIN_MODULE if shared.Settings.MAIN_MODULE or shared.Settings.SIDE_MODULE: assert not memory_init_file, 'memory init file is not supported with module linking' assert shared.Settings.ASM_JS, 'module linking requires asm.js output (-s ASM_JS=1)' shared.Settings.LINKABLE = 1 # TODO: add FORCE_DCE option for the brave people that do want to dce here and in side modules debug_level = max(debug_level, 2) if shared.Settings.ASSERTIONS and shared.Settings.ALIASING_FUNCTION_POINTERS: logging.warning('ALIASING_FUNCTION_POINTERS is on, function pointer comparisons may be invalid across types') if shared.Settings.STB_IMAGE and final_suffix in JS_CONTAINING_SUFFIXES: input_files.append(shared.path_from_root('third_party', 'stb_image.c')) shared.Settings.EXPORTED_FUNCTIONS += ['_stbi_load', '_stbi_load_from_memory', '_stbi_image_free'] if type(shared.Settings.EXPORTED_FUNCTIONS) in (list, tuple): # always need malloc and free to be kept alive and exported, for internal use and other modules for required_export in ['_malloc', '_free']: if required_export not in shared.Settings.EXPORTED_FUNCTIONS: shared.Settings.EXPORTED_FUNCTIONS.append(required_export) else: logging.debug('using response file for EXPORTED_FUNCTIONS, make sure it includes _malloc and _free') if shared.Settings.ASM_JS and shared.Settings.DLOPEN_SUPPORT: assert shared.Settings.DISABLE_EXCEPTION_CATCHING, 'no exceptions support with dlopen in asm yet' if proxy_to_worker: shared.Settings.PROXY_TO_WORKER = 1 if js_opts: shared.Settings.RUNNING_JS_OPTS = 1 ## Compile source code to bitcode logging.debug('compiling to bitcode') temp_files = [] log_time('parse arguments and setup') # Precompiled headers support if has_header_inputs: for header in input_files: assert header.endswith(HEADER_ENDINGS), 'if you have one header input, we assume you want to precompile headers, and cannot have source files or other inputs as well: ' + str(input_files) + ' : ' + header args = newargs + shared.EMSDK_CXX_OPTS + input_files logging.debug("running (for precompiled headers: " + call + ' ' + ' '.join(args)) execute([call] + args) # let compiler frontend print directly, so colors are saved (PIPE kills that) sys.exit(1) # First, generate LLVM bitcode. For each input file, we get base.o with bitcode for input_file in input_files: file_ending = filename_type_ending(input_file) if file_ending.endswith(SOURCE_ENDINGS): logging.debug('compiling source file: ' + input_file) input_file = shared.Building.preprocess(input_file, in_temp(uniquename(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 file_ending.endswith(CXX_ENDINGS): args += shared.EMSDK_CXX_OPTS logging.debug("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): logging.error('compiler frontend failed to generate LLVM bitcode, halting') sys.exit(1) else: # bitcode if file_ending.endswith(BITCODE_ENDINGS): logging.debug('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 file_ending.endswith(DYNAMICLIB_ENDINGS) or shared.Building.is_ar(input_file): logging.debug('copying library file: ' + input_file) temp_file = in_temp(uniquename(input_file)) shutil.copyfile(input_file, temp_file) temp_files.append(temp_file) elif file_ending.endswith(ASSEMBLY_ENDINGS): 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 logging.debug('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) else: logging.error(input_file + ': Unknown file suffix when compiling to LLVM bitcode!') sys.exit(1) log_time('bitcodeize inputs') if not LEAVE_INPUTS_RAW: assert len(temp_files) == len(input_files) # Optimize source files if llvm_opts > 0: for i, input_file in enumerate(input_files): file_ending = filename_type_ending(input_file) if file_ending.endswith(SOURCE_ENDINGS): temp_file = temp_files[i] logging.debug('optimizing %s with -O%s' % (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 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: temp_output_base = in_temp(unsuffixed(uniquename(input_files[0]))) if specified_target.endswith('/') or specified_target.endswith('\\') or os.path.isdir(specified_target): # User passed '-o as the location of the output. Generating output file ' + obj_output_name) try: shutil.move(temp_output_base + '.o', obj_output_name) except IOError, e: logging.error('Could not write to output file ' + obj_output_name + '. Perhaps the output directory does not exist?') exit(1) else: # User passed '-o ' as the location to output to. shutil.move(temp_output_base + '.o', specified_target) if os.path.exists(temp_output_base + '.d'): # There was a .d file generated, from -MD or -MMD and friends, save a copy of it to where the output resides, # adjusting the target name away from the temporary file name to the specified target. # It will be deleted with the rest of the temporary directory. deps = open(temp_output_base + '.d').read() deps = deps.replace(temp_output_base + '.o', specified_target) with open(os.path.join(os.path.dirname(specified_target), os.path.basename(unsuffixed(input_files[0]) + '.d')), "w") as out_dep: out_dep.write(deps) 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 logging.debug('link: ' + str(temp_files) + specified_target) shared.Building.link(temp_files, specified_target) exit(0) log_time('bitcodeize inputs') ## Continue on to create JavaScript logging.debug('will generate JavaScript') if not LEAVE_INPUTS_RAW and \ not shared.Settings.BUILD_AS_SHARED_LIB and \ not shared.Settings.SIDE_MODULE: # shared libraries/side modules link no C libraries, need them in parent extra_files_to_link = system_libs.calculate(temp_files, in_temp, stdout, stderr) else: extra_files_to_link = [] log_time('calculate system libraries') # 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_ENDINGS or suffix(temp_files[0]) in DYNAMICLIB_ENDINGS) and shared.Building.is_ar(temp_files[0])): linker_inputs = temp_files + extra_files_to_link logging.debug('linking: ' + str(linker_inputs)) shared.Building.link(linker_inputs, in_temp(target_basename + '.bc'), force_archive_contents = len(filter(lambda temp: not temp.endswith(STATICLIB_ENDINGS), temp_files)) == 0) 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 = in_temp(input_files[0]) shutil.copyfile(input_files[0], final) log_time('link') if DEBUG: logging.debug('saving intermediate processing steps to %s' % shared.EMSCRIPTEN_TEMP_DIR) intermediate_counter = 0 def save_intermediate(name=None, suffix='js'): global intermediate_counter 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 if not LEAVE_INPUTS_RAW: save_intermediate('basebc', 'bc') # 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_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 we can LTO, do it before dce, since it opens up dce opportunities if shared.Building.can_build_standalone() and 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'] 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'] if (not save_bc and not fastcomp) or AUTODEBUG: # let llvm opt directly emit ll, to skip writing and reading all the bitcode link_opts += ['-S'] shared.Building.llvm_opt(final, link_opts, final + '.link.ll') final = final + '.link.ll' if DEBUG: save_intermediate('linktime', 'll') else: if fastcomp and not save_bc: # Simplify LLVM bitcode for fastcomp link_opts += fastcomp_opts shared.Building.llvm_opt(final, link_opts) if DEBUG: save_intermediate('linktime', 'bc') if save_bc: shutil.copyfile(final, save_bc) if fastcomp: shared.Building.llvm_opt(final, fastcomp_opts, final + '.adsimp.bc') final += '.adsimp.bc' if DEBUG: save_intermediate('adsimp', 'bc') # Prepare .ll for Emscripten if not LEAVE_INPUTS_RAW: if save_bc: final = shared.Building.llvm_dis(final, final + '.ll') else: assert len(input_files) == 1 if DEBUG and save_bc: save_intermediate('ll', 'll') if AUTODEBUG: logging.debug('autodebug') execute([shared.PYTHON, shared.AUTODEBUGGER, final, final + '.ad.ll']) final += '.ad.ll' if DEBUG: save_intermediate('autodebug', 'll') # Simplify bitcode after autodebug if fastcomp and (AUTODEBUG or LEAVE_INPUTS_RAW): shared.Building.llvm_opt(final, fastcomp_opts, final + '.adsimp.bc') final += '.adsimp.bc' if DEBUG: save_intermediate('adsimp', 'bc') log_time('post-link') # Emscripten logging.debug('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') log_time('emscript (llvm=>js)') # Embed and preload files if len(preload_files) + len(embed_files) > 0: logging.debug('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 len(exclude_files) > 0: file_args.append('--exclude') file_args += exclude_files if Compression.on: file_args += ['--compress', Compression.encoder, Compression.decoder, Compression.js_name] if use_preload_cache: file_args.append('--use-preload-cache') if no_heap_copy: file_args.append('--no-heap-copy') file_code = execute([shared.PYTHON, shared.FILE_PACKAGER, unsuffixed(target) + '.data'] + file_args, stdout=PIPE)[0] pre_js = file_code + pre_js # Apply pre and postjs files if pre_js or post_js: logging.debug('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: logging.debug('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 logging.debug('applying transform: %s' % js_transform) subprocess.check_call(shlex.split(js_transform, posix=posix) + [os.path.abspath(final)]) if DEBUG: save_intermediate('transformed') js_transform_tempfiles = [final] if memory_init_file: if shared.Settings.USE_TYPED_ARRAYS != 2: if type(memory_init_file) == int: logging.warning('memory init file requires typed arrays mode 2') else: memfile = target + '.mem' shared.try_delete(memfile) def repl(m): # handle chunking of the memory initializer s = m.groups(0)[0] open(memfile, 'wb').write(''.join(map(lambda x: chr(int(x or '0')), s.split(',')))) if DEBUG: # Copy into temp dir as well, so can be run there too temp_memfile = os.path.join(shared.EMSCRIPTEN_TEMP_DIR, os.path.basename(memfile)) if os.path.abspath(memfile) != os.path.abspath(memfile): shutil.copyfile(memfile, temp_memfile) return 'var memoryInitializer = "%s";' % os.path.basename(memfile) src = re.sub(shared.JS.memory_initializer_pattern, repl, open(final).read(), count=1) open(final + '.mem.js', 'w').write(src) final += '.mem.js' src = None js_transform_tempfiles[-1] = final # simple text substitution preserves comment line number mappings if DEBUG: if os.path.exists(memfile): save_intermediate('meminit') logging.debug('wrote memory initialization to %s' % memfile) else: logging.debug('did not see memory initialization') elif shared.Settings.USE_TYPED_ARRAYS == 2 and not shared.Settings.MAIN_MODULE and not shared.Settings.SIDE_MODULE: # not writing a binary init, but we can at least optimize them by splitting them up src = open(final).read() src = shared.JS.optimize_initializer(src) if src is not None: logging.debug('optimizing memory initialization') open(final + '.mem.js', 'w').write(src) final += '.mem.js' src = None log_time('source transforms') # It is useful to run several js optimizer passes together, to save on unneeded unparsing/reparsing js_optimizer_queue = [] js_optimizer_extra_info = {} js_optimizer_queue_history = [] def flush_js_optimizer_queue(): global final, js_optimizer_queue, js_optimizer_extra_info, js_optimizer_queue_history if len(js_optimizer_extra_info) == 0: js_optimizer_extra_info = None if len(js_optimizer_queue) > 0 and not(not shared.Settings.ASM_JS and len(js_optimizer_queue) == 1 and js_optimizer_queue[0] == 'last'): def add_opt_args(args): if shared.Settings.ASM_JS: args = ['asm'] + args if shared.Settings.PRECISE_F32: args = ['asmPreciseF32'] + args return args if DEBUG != '2': js_optimizer_queue = add_opt_args(js_optimizer_queue) logging.debug('applying js optimization passes: %s', js_optimizer_queue) final = shared.Building.js_optimizer(final, js_optimizer_queue, jcache, debug_level >= 4, js_optimizer_extra_info) js_transform_tempfiles.append(final) if DEBUG: save_intermediate('js_opts') else: for name in js_optimizer_queue: passes = add_opt_args([name]) if shared.Settings.ASM_JS: passes = ['asm'] + passes logging.debug('applying js optimization pass: %s', passes) final = shared.Building.js_optimizer(final, passes, jcache, debug_level >= 4, js_optimizer_extra_info) js_transform_tempfiles.append(final) save_intermediate(name) js_optimizer_queue_history += js_optimizer_queue js_optimizer_queue = [] js_optimizer_extra_info = {} if opt_level >= 1 and js_opts: logging.debug('running pre-closure post-opts') if DEBUG == '2': # Clean up the syntax a bit final = shared.Building.js_optimizer(final, [], jcache, debug_level >= 4) js_transform_tempfiles.append(final) if DEBUG: save_intermediate('pretty') def get_eliminate(): if shared.Settings.ALLOW_MEMORY_GROWTH: return 'eliminateMemSafe' else: return 'eliminate' if opt_level >= 2: js_optimizer_queue += [get_eliminate()] if shared.Settings.AGGRESSIVE_VARIABLE_ELIMINATION: js_optimizer_queue += ['aggressiveVariableElimination'] js_optimizer_queue += ['simplifyExpressions'] if opt_level >= 3 and shared.Settings.PRECISE_F32: js_optimizer_queue += ['optimizeFrounds'] if closure and not shared.Settings.ASM_JS: 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') if js_opts: if shared.Settings.ASM_JS and shared.Settings.SAFE_HEAP: js_optimizer_queue += ['safeHeap'] if shared.Settings.OUTLINING_LIMIT > 0 and shared.Settings.ASM_JS: js_optimizer_queue += ['outline'] js_optimizer_extra_info['sizeToOutline'] = shared.Settings.OUTLINING_LIMIT if opt_level >= 2 and (not closure or shared.Settings.ASM_JS) and shared.Settings.RELOOP and debug_level < 3: if shared.Settings.ASM_JS and opt_level >= 3 and shared.Settings.OUTLINING_LIMIT == 0: js_optimizer_queue += ['registerizeHarder'] else: js_optimizer_queue += ['registerize'] if opt_level >= 2: if debug_level < 2 and shared.Settings.ASM_JS: js_optimizer_queue += ['minifyNames'] if debug_level == 0: js_optimizer_queue += ['minifyWhitespace'] if closure and shared.Settings.ASM_JS: js_optimizer_queue += ['closure'] if not shared.Settings.SIDE_MODULE: js_optimizer_queue += ['last'] # side modules are not finalized until after relocation flush_js_optimizer_queue() log_time('js opts') # Remove some trivial whitespace # TODO: do not run when compress has already been done on all parts of the code #src = open(final).read() #src = re.sub(r'\n+[ \n]*\n+', '\n', src) #open(final, 'w').write(src) 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() assert '{{{ SCRIPT }}}' in shell, 'HTML shell must contain {{{ SCRIPT }}} , see src/shell.html for an example' html = open(target, 'w') js_target = unsuffixed(target) + '.js' base_js_target = os.path.basename(js_target) if proxy_to_worker: html.write(shell.replace('{{{ SCRIPT }}}', '')) shutil.move(final, js_target) elif not Compression.on: # Normal code generation path if debug_level >= 4: generate_source_map(target) shutil.move(final, js_target) need_mods = shared.Settings.PRECISE_F32 == 2 if not need_mods: # Non-modifiable code, just load the code directly script_tag = '''''' % base_js_target else: # Potentially-modifiable code, load as text, modify, then execute. This lets you # patch the code on the client machine right before it is executed, perhaps based # on information about the client. checks = [] mods = [] if shared.Settings.PRECISE_F32 == 2: checks.append('!Math.fround') if 'minifyNames' not in js_optimizer_queue_history: # simple dumb replace mods.append(''' console.log('optimizing out Math.fround calls'); code = code.replace(/Math_fround\(/g, '(').replace("'use asm'", "'almost asm'") ''') else: # minified, not quite so simple - TODO mods.append(''' try { console.log('optimizing out Math.fround calls'); var m = /var ([^=]+)=global\.Math\.fround;/.exec(code); var minified = m[1]; if (!minified) throw 'fail'; var startAsm = code.indexOf('// EMSCRIPTEN_START_FUNCS'); var endAsm = code.indexOf('// EMSCRIPTEN_END_FUNCS'); var asm = code.substring(startAsm, endAsm); do { var moar = false; // we need to re-do, as x(x( will not be fixed asm = asm.replace(new RegExp('[^a-zA-Z0-9\\\\$\\\\_]' + minified + '\\\\(', 'g'), function(s) { moar = true; return s[0] + '(' }); } while (moar); code = code.substring(0, startAsm) + asm + code.substring(endAsm); code = code.replace("'use asm'", "'almost asm'"); } catch(e) { console.log('failed to optimize out Math.fround calls ' + e) } ''') fixes = '' for i in range(len(checks)): fixes += 'if (' + checks[i] + ') { ' + mods[i] + ' }\n' # if all the checks are negative, just emit a script tag normally, that's better. # otherwise, do an xhr to get the code as text, modify, and load asynchronously code = 'if (!(' + ' || '.join(checks) + ''')) { var script = document.createElement('script'); script.src = "''' + base_js_target + '''"; document.body.appendChild(script); } else { var codeXHR = new XMLHttpRequest(); codeXHR.open('GET', '%s', true); codeXHR.onload = function() { var code = codeXHR.responseText; %s var blob = new Blob([code], { type: 'text/javascript' }); codeXHR = null; var src = URL.createObjectURL(blob); var script = document.createElement('script'); script.src = URL.createObjectURL(blob); script.onload = function() { URL.revokeObjectURL(script.src); }; document.body.appendChild(script); }; codeXHR.send(null); } ''' % (base_js_target, fixes) script_tag = '''''' % code html.write(shell.replace('{{{ SCRIPT }}}', script_tag)) else: # Compress the main code 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(base_js_target) html.write(shell.replace('{{{ SCRIPT }}}', '')) # 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: if debug_level >= 4: generate_source_map(target) # copy final JS to output shutil.move(final, target) log_time('final emitting') if DEBUG: logging.debug('total time: %.2f seconds' % (time.time() - start_time)) finally: if not TEMP_DIR: try: shutil.rmtree(temp_dir) except: pass else: logging.info('emcc saved files are in:' + temp_dir)