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emscripten
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emscripten/emcc

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85 KiB
Python
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#!/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
from subprocess import PIPE, STDOUT
from tools import shared, jsrun
from tools.shared import Compression, execute, suffix, unsuffixed, unsuffixed_basename, WINDOWS
from tools.response_file import read_response_file
C_SUFFIXES = ('.c', '.C')
CXX_SUFFIXES = ('.cpp', '.cxx', '.cc', '.CPP', '.CXX', '.CC')
SOURCE_SUFFIXES = C_SUFFIXES + CXX_SUFFIXES + ('.m', '.mm')
BITCODE_SUFFIXES = ('.bc', '.o', '.obj')
DYNAMICLIB_SUFFIXES = ('.dylib', '.so', '.dll')
STATICLIB_SUFFIXES = ('.a',)
ASSEMBLY_SUFFIXES = ('.ll',)
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 is 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 dangerous optimizations that may
break the generated code! This adds
-s FORCE_ALIGNED_MEMORY=1
-s DOUBLE_MODE=0
-s PRECISE_I64_MATH=0
--closure 1
--llvm-lto 3
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 and
src/settings.js (for the -s options) 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)
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<level> 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 <mode> 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 <level> 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 <level> 0: No LLVM LTO (default)
1: LLVM LTO is performed
2: We combine all the bitcode and run LLVM opt -O3
on that (which optimizes across modules, but is
not the same as normal LTO), but do not do normal
LTO
3: We do both 2 and then 1
Note: If LLVM optimizations are not run
(see --llvm-opts), setting this has no
effect.
Note that LLVM LTO is not perfectly stable yet,
and can can cause code to behave incorrectly.
--closure <on> 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.
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).
--js-transform <cmd> <cmd> 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. <cmd> 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.
<cmd> is interpreted as a space-separated
list of arguments, for example, <cmd> of
"python processor.py" will cause a python
script to be run.
--pre-js <file> 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 <file> 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 <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 <name> 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
--compression <codec> Compress both the compiled code and embedded/
preloaded files. <codec> should be a triple,
<native_encoder>,<js_decoder>,<js_name>
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
--split <size> Splits the resulting javascript file into pieces
to ease debugging. This option only works if
Javascript is generated (target -o <name>.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 <path> 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 for an example)
Note that this argument is ignored if a
target other than HTML is specified using
the -o option.
--js-library <lib> 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 <on> If on, we generate a separate memory initialization
file. This is more efficient than storing the
memory initialization data embedded inside
JavaScript as text. (default is off)
-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.
The target file, if specified (-o <target>), defines what will
be generated:
<name>.js JavaScript
<name>.html HTML + side JavaScript file (<name>.js)
(JS on the side improves page load time)
<name>.bc LLVM bitcode (default)
<name>.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: CC_ADDITIONAL_ARGS += 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
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','.m')):
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:]
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 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)
logging.debug('Just copy:' + sys.argv[-1] + target)
shutil.copy(sys.argv[-1], target)
else:
logging.debug('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))
# 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 ''
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 = []
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
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])
newargs[i] = ''
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('--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]
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] = ''
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 llvm_lto is None and opt_level >= 3: llvm_lto = 3
if opt_level == 0: debug_level = 4
if closure is None and opt_level == 3: closure = True
if llvm_lto is None and bind:
logging.debug('running lto for embind') # XXX this is a workaround for a pointer issue
llvm_lto = 1
# TODO: support source maps with js_transform
if js_transform and debug_level >= 4:
logging.warning('disabling source maps because a js transform is being done')
debug_level = 3
if DEBUG: start_time = time.time() # done after parsing arguments, which might affect debug state
if closure:
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
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_SUFFIXES + BITCODE_SUFFIXES + DYNAMICLIB_SUFFIXES + ASSEMBLY_SUFFIXES)):
arg = os.path.realpath(arg)
if not arg.startswith('-'):
if not os.path.exists(arg):
logging.error(arg + ': No such file or directory')
exit(1)
arg_suffix = filename_type_suffix(arg)
if arg_suffix.endswith(SOURCE_SUFFIXES + BITCODE_SUFFIXES + DYNAMICLIB_SUFFIXES + ASSEMBLY_SUFFIXES) or shared.Building.is_ar(arg): # we already removed -o <target>, so all these should be inputs
newargs[i] = ''
if arg_suffix.endswith(SOURCE_SUFFIXES):
input_files.append(arg)
has_source_inputs = True
elif arg_suffix.endswith(ASSEMBLY_SUFFIXES) or shared.Building.is_bitcode(arg): # this should be bitcode, make sure it is valid
input_files.append(arg)
elif arg_suffix.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:
logging.warning(arg + ' is not valid LLVM bitcode')
elif arg_suffix.endswith(STATICLIB_SUFFIXES):
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_SUFFIXES) + ', but instead is an LLVM bitcode file! When linking LLVM bitcode files, use one of the suffixes ' + str(BITCODE_SUFFIXES))
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, '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:
logging.warning('not linking against libraries since only compiling to bitcode')
libs = []
# 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_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):
logging.debug('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:
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_SUFFIXES + BITCODE_SUFFIXES + DYNAMICLIB_SUFFIXES + STATICLIB_SUFFIXES + ASSEMBLY_SUFFIXES))
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
if os.environ.get('EMCC_FAST_COMPILER'):
shared.Settings.ASM_JS = 1
if shared.Settings.ASM_JS:
assert opt_level >= 1 or os.environ.get('EMCC_FAST_COMPILER'), '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'
heap = 4096
while heap < shared.Settings.TOTAL_MEMORY:
if heap < 16*1024*1024:
heap *= 2
else:
heap += 16*1024*1024
if heap != shared.Settings.TOTAL_MEMORY:
logging.warning('increasing TOTAL_MEMORY to %d to be more reasonable for asm.js' % heap)
shared.Settings.TOTAL_MEMORY = heap
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 = []
# First, generate LLVM bitcode. For each input file, we get base.o with bitcode
for input_file in input_files:
file_suffix = filename_type_suffix(input_file)
if file_suffix.endswith(SOURCE_SUFFIXES):
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_suffix.endswith(CXX_SUFFIXES):
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_suffix.endswith(BITCODE_SUFFIXES):
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_suffix.endswith(DYNAMICLIB_SUFFIXES) 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_suffix.endswith(ASSEMBLY_SUFFIXES):
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)
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_suffix = filename_type_suffix(input_file)
if file_suffix.endswith(SOURCE_SUFFIXES):
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])))
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 <target>), 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)
## Continue on to create JavaScript
logging.debug('will generate JavaScript')
extra_files_to_link = []
if not LEAVE_INPUTS_RAW and \
not shared.Settings.BUILD_AS_SHARED_LIB == 2 and \
not shared.Settings.SIDE_MODULE: # shared libraries/side modules link no C libraries, need them in 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++.)
def read_symbols(path, exclude=None):
symbols = map(lambda line: line.strip().split(' ')[1], open(path).readlines())
if exclude:
symbols = filter(lambda symbol: symbol not in exclude, symbols)
return set(symbols)
lib_opts = ['-O2']
# XXX We also need to add libc symbols that use malloc, for example strdup. It's very rare to use just them and not
# a normal malloc symbol (like free, after calling strdup), so we haven't hit this yet, but it is possible.
libc_symbols = read_symbols(shared.path_from_root('system', 'lib', 'libc.symbols'))
sdl_symbols = read_symbols(shared.path_from_root('system', 'lib', 'sdl.symbols'))
libcextra_symbols = read_symbols(shared.path_from_root('system', 'lib', 'libcextra.symbols'))
libcxx_symbols = read_symbols(shared.path_from_root('system', 'lib', 'libcxx', 'symbols'), exclude=libc_symbols)
libcxxabi_symbols = read_symbols(shared.path_from_root('system', 'lib', 'libcxxabi', 'symbols'), exclude=libc_symbols)
# XXX we should disable EMCC_DEBUG when building libs, just like in the relooper
def build_libc(lib_filename, files):
o_s = []
prev_cxx = os.environ.get('EMMAKEN_CXX')
if prev_cxx: os.environ['EMMAKEN_CXX'] = ''
musl_internal_includes = shared.path_from_root('system', 'lib', 'libc', 'musl', 'src', 'internal')
for src in files:
o = in_temp(os.path.basename(src) + '.o')
execute([shared.PYTHON, shared.EMCC, shared.path_from_root('system', 'lib', src), '-o', o, '-I', musl_internal_includes] + lib_opts, stdout=stdout, stderr=stderr)
o_s.append(o)
if prev_cxx: os.environ['EMMAKEN_CXX'] = prev_cxx
shared.Building.link(o_s, in_temp(lib_filename))
return in_temp(lib_filename)
def build_libcxx(src_dirname, lib_filename, files):
o_s = []
for src in files:
o = in_temp(src + '.o')
srcfile = shared.path_from_root(src_dirname, src)
execute([shared.PYTHON, shared.EMXX, srcfile, '-o', o, '-std=c++11'] + lib_opts, stdout=stdout, stderr=stderr)
o_s.append(o)
shared.Building.link(o_s, in_temp(lib_filename))
return in_temp(lib_filename)
# libc
def create_libc():
logging.debug(' building libc for cache')
libc_files = [
'dlmalloc.c',
os.path.join('libcxx', 'new.cpp'),
os.path.join('libc', 'stdlib', 'getopt_long.c'),
os.path.join('libc', 'gen', 'err.c'),
os.path.join('libc', 'gen', 'errx.c'),
os.path.join('libc', 'gen', 'warn.c'),
os.path.join('libc', 'gen', 'warnx.c'),
os.path.join('libc', 'gen', 'verr.c'),
os.path.join('libc', 'gen', 'verrx.c'),
os.path.join('libc', 'gen', 'vwarn.c'),
os.path.join('libc', 'gen', 'vwarnx.c'),
os.path.join('libc', 'stdlib', 'strtod.c'),
]
musl_files = [
]
for directory, sources in musl_files:
libc_files += [os.path.join('libc', 'musl', 'src', directory, source) for source in sources]
return build_libc('libc.bc', libc_files)
def apply_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.
return True
# libcextra
def create_libcextra():
logging.debug('building libcextra for cache')
musl_files = [
['ctype', [
'iswalnum.c',
'iswalpha.c',
'iswblank.c',
'iswcntrl.c',
'iswctype.c',
'iswdigit.c',
'iswgraph.c',
'iswlower.c',
'iswprint.c',
'iswpunct.c',
'iswspace.c',
'iswupper.c',
'iswxdigit.c',
'towctrans.c',
'wcswidth.c',
'wctrans.c',
'wcwidth.c',
]],
['locale', [
'iconv.c',
'iswalnum_l.c',
'iswalpha_l.c',
'iswblank_l.c',
'iswcntrl_l.c',
'iswctype_l.c',
'iswdigit_l.c',
'iswgraph_l.c',
'iswlower_l.c',
'iswprint_l.c',
'iswpunct_l.c',
'iswspace_l.c',
'iswupper_l.c',
'iswxdigit_l.c',
'strfmon.c',
'strxfrm.c',
'towctrans_l.c',
'towlower_l.c',
'towupper_l.c',
'wcscoll.c',
'wcscoll_l.c',
'wcsxfrm.c',
'wcsxfrm_l.c',
'wctrans_l.c',
'wctype_l.c',
]],
['multibyte', [
'btowc.c',
'mblen.c',
'mbrlen.c',
'mbrtowc.c',
'mbsinit.c',
'mbsnrtowcs.c',
'mbsrtowcs.c',
'mbstowcs.c',
'mbtowc.c',
'wcrtomb.c',
'wcsnrtombs.c',
'wcsrtombs.c',
'wcstombs.c',
'wctob.c',
'wctomb.c',
]],
['regex', [
'regcomp.c',
'regerror.c',
'regexec.c',
'tre-mem.c',
]],
['stdio', [
'fwprintf.c',
'swprintf.c',
'vfwprintf.c',
'vswprintf.c',
'vwprintf.c',
'wprintf.c',
]],
['stdlib', [
'ecvt.c',
'fcvt.c',
'gcvt.c',
]],
['string', [
'wcpcpy.c',
'wcpncpy.c',
'wcscasecmp.c',
'wcscasecmp_l.c',
'wcscat.c',
'wcschr.c',
'wcscmp.c',
'wcscpy.c',
'wcscspn.c',
'wcsdup.c',
'wcslen.c',
'wcsncasecmp.c',
'wcsncasecmp_l.c',
'wcsncat.c',
'wcsncmp.c',
'wcsncpy.c',
'wcsnlen.c',
'wcspbrk.c',
'wcsrchr.c',
'wcsspn.c',
'wcsstr.c',
'wcstok.c',
'wcswcs.c',
'wmemchr.c',
'wmemcmp.c',
'wmemcpy.c',
'wmemmove.c',
'wmemset.c',
]]
]
libcextra_files = []
for directory, sources in musl_files:
libcextra_files += [os.path.join('libc', 'musl', 'src', directory, source) for source in sources]
return build_libc('libcextra.bc', libcextra_files)
# libcxx
def create_libcxx():
logging.debug('building libcxx for cache')
libcxx_files = [
'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'
]
return build_libcxx(os.path.join('system', 'lib', 'libcxx'), 'libcxx.bc', libcxx_files)
def apply_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
#logging.info('using libcxx turns on CORRECT_* options')
return True
# libcxxabi - just for dynamic_cast for now
def create_libcxxabi():
logging.debug('building libcxxabi for cache')
libcxxabi_files = [
'typeinfo.cpp',
'private_typeinfo.cpp'
]
return build_libcxx(os.path.join('system', 'lib', 'libcxxabi', 'src'), 'libcxxabi.bc', libcxxabi_files)
def apply_libcxxabi(need):
assert shared.Settings.QUANTUM_SIZE == 4, 'We do not support libc++abi with QUANTUM_SIZE == 1'
#logging.info('using libcxxabi, this may need CORRECT_* options')
#shared.Settings.CORRECT_SIGNS = shared.Settings.CORRECT_OVERFLOWS = shared.Settings.CORRECT_ROUNDINGS = 1
return True
# SDL. We include code that demands malloc/free if not already required, so we have proper malloc/free from JS SDL code.
# Note that the Force instance here can be optimized out, but we still export malloc/free, so they will be kept alive.
def create_sdl():
return build_libcxx(os.path.join('system', 'lib'), 'sdl.bc', ['sdl.cpp'])
def apply_sdl(need):
return 'SDL_Init' in all_needed and ('malloc' not in all_needed or 'free' not in all_needed)
# Settings this in the environment will avoid checking dependencies and make building big projects a little faster
# 1 means include everything; otherwise it can be the name of a lib (libcxx, etc.)
force = os.environ.get('EMCC_FORCE_STDLIBS')
force_all = force == '1'
# Scan symbols
all_needed = set()
symbolses = map(lambda temp_file: shared.Building.llvm_nm(temp_file), temp_files)
for symbols in symbolses:
all_needed.update(symbols.undefs)
for symbols in symbolses:
all_needed.difference_update(symbols.defs)
# Go over libraries to figure out which we must include
# If we have libcxx, we must force inclusion of libc, since libcxx uses new internally. Note: this is kind of hacky.
has = need = None
for name, create, apply_, library_symbols in [('libcxx', create_libcxx, apply_libcxx, libcxx_symbols),
('libcextra', create_libcextra, lambda x: True, libcextra_symbols),
('libcxxabi', create_libcxxabi, apply_libcxxabi, libcxxabi_symbols),
('sdl', create_sdl, apply_sdl, sdl_symbols),
('libc', create_libc, apply_libc, libc_symbols)]:
force_this = force_all or force == name
if not force_this:
need = set()
has = set()
for symbols in symbolses:
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 shared.Settings.VERBOSE: logging.debug('considering %s: we need %s and have %s' % (name, str(need), str(has)))
if force_this or len(need) > 0:
force_all = True
if apply_(need):
# We need to build and link the library in
logging.debug('including %s' % name)
libfile = shared.Cache.get(name, create)
extra_files_to_link.append(libfile)
# 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
logging.debug('linking: ' + str(linker_inputs))
t0 = time.time()
shared.Building.link(linker_inputs, in_temp(target_basename + '.bc'), force_archive_contents = len(filter(lambda temp: not temp.endswith(STATICLIB_SUFFIXES), temp_files)) == 0)
t1 = time.time()
logging.debug(' linking took %.2f seconds' % (t1 - t0))
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)
if DEBUG:
logging.debug('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:
logging.debug(' 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 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']
# Simplify LLVM bitcode for fastcomp
if os.environ.get('EMCC_FAST_COMPILER'):
link_opts += ['-pnacl-abi-simplify-preopt', '-pnacl-abi-simplify-postopt']
if not save_bc and not os.environ.get('EMCC_FAST_COMPILER') and not 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:
shared.Building.llvm_opt(final, link_opts)
if DEBUG: save_intermediate('linktime', 'bc')
if save_bc:
shutil.copyfile(final, save_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')
# 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')
# Embed and preload files
if len(preload_files) + len(embed_files) > 0:
logging.debug('setting up files')
file_args = ['--pre-run']
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]
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 = re.sub('[\[\]\n\(\)\. ]', '', m.groups(0)[0])
s = s.replace('concat', ',')
if s[-1] == ',': s = s[:-1]
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'
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')
# It is useful to run several js optimizer passes together, to save on unneeded unparsing/reparsing
js_optimizer_queue = []
js_optimizer_extra_info = {}
def flush_js_optimizer_queue():
global final, js_optimizer_queue, js_optimizer_extra_info
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'):
if DEBUG != '2':
if shared.Settings.ASM_JS:
js_optimizer_queue = ['asm'] + js_optimizer_queue
logging.debug('applying js optimization passes: %s', js_optimizer_queue)
final = shared.Building.js_optimizer(final, js_optimizer_queue, jcache, 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 = [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 = []
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'
js_optimizer_queue += [get_eliminate()]
if opt_level >= 2:
js_optimizer_queue += ['simplifyExpressions']
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.OUTLINING_LIMIT > 0 and shared.Settings.ASM_JS:
js_optimizer_queue += ['outline']
js_optimizer_extra_info['sizeToOutline'] = shared.Settings.OUTLINING_LIMIT
if (not closure or shared.Settings.ASM_JS) and shared.Settings.RELOOP and debug_level < 3:
js_optimizer_queue += ['registerize']
if opt_level > 0:
if debug_level < 2 and shared.Settings.ASM_JS: js_optimizer_queue = map(lambda p: p if p != 'registerize' else 'registerizeAndMinify', js_optimizer_queue)
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()
# 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 }}}', '<script>' + open(shared.path_from_root('src', 'proxyClient.js')).read().replace('{{{ filename }}}', target_basename) + '</script>'))
shutil.move(final, js_target)
elif not Compression.on:
if debug_level >= 4:
generate_source_map(target)
shutil.move(final, js_target)
script_tag = '''<script async type="text/javascript" src="%s"></script>''' % base_js_target
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 }}}', '<script>' + decoding + '</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)
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)
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