https://github.com/kripken/emscripten
Tip revision: 92f653eed8ca32dec307ef335b3e98c9ccc4ab67 authored by Alon Zakai on 21 July 2014, 18:23:35 UTC
build enough of libcxxabi to support bad_typeid without undefined symbols; 1.21.5; fixes #2547
build enough of libcxxabi to support bad_typeid without undefined symbols; 1.21.5; fixes #2547
Tip revision: 92f653e
emcc
#!/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
from tools import shared, jsrun, system_libs
from tools.shared import Compression, execute, suffix, unsuffixed, unsuffixed_basename, WINDOWS, safe_move
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') # Windows .dll suffix is not included in this list, since those are never linked to directly on the command line.
STATICLIB_ENDINGS = ('.a',)
ASSEMBLY_ENDINGS = ('.ll',)
HEADER_ENDINGS = ('.h', '.hxx', '.hpp', '.hh', '.H', '.HXX', '.HPP', '.HH')
SUPPORTED_LINKER_FLAGS = ('--start-group', '-(', '--end-group', '-)')
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
if DEBUG: logging.warning('invocation: ' + ' '.join(sys.argv) + (' + ' + EMCC_CFLAGS if EMCC_CFLAGS else '') + ' (in ' + os.getcwd() + ')')
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, LLVM
-O3 optimizations, and memory init file generation
(--memory-init-file 1). This is a good setting
for an optimized build: runs much faster than
-O1, and compiles much faster than -O3.
-Os Like -O2 with extra optimizations for size.
-Oz Like -Os but reduces code size further.
-O3 Like -O2 plus additional JS optimizations that can
take a significant amount of compilation time and/or
are relatively new. Note that differs from -O2 only
during the bitcode to JS (final link + JS generation)
stage, as it is JS-specific, so you can run -Os
on your source files for example, and -O3 during
JS generation if you want.
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<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)
-profiling Use reasonable defaults when emitting JS to
make the build useful for profiling. This
sets -g2 (preserve function names) and may
also enable optimizations that affect
performance and otherwise might not be
performed in -g2.
--emit-symbol-map Save a map file between the minified
global names and the original function names.
This allows you to reconstruct meaningful
stack traces, for example. (This is only
relevant when minifying global names, which
happens in -O2 and above, and when no -g
option to prevent minification was specified.)
--typed-arrays <mode> 0: No typed arrays
1: Parallel typed arrays
2: Shared (C-like) typed arrays (default)
--js-opts <on> 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.
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 <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.
Note that the post js will typically run after
main() completes (unless there is something
async). In that case, main() will exit and
the post js will not be reached (just as if
you call exit() in C code). If you want to
prevent that, you can build with
-s NO_EXIT_RUNTIME=1
--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.
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 <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
--exclude-file <name> Files and directories to be excluded from
--embed-file and --preload-file
wildcard is supported
--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 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 <codec> **THIS OPTION IS DEPRECATED**
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
--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.
--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".
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 <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.
It will also run emscripten's internal sanity
checks, checking that things like the LLVM directory
path looks correct, etc. This works with or
without other arguments, so it can be useful to run
emcc -v
if you see odd errors, as it can help diagnose
things.
Note that this will retain temporary files in
the canonical location (usually
/tmp/emscripten_temp) because that is what
EMCC_DEBUG=1 does.
--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> 0: Do not emit a separate memory initialization
file, keep the static initialization inside
the generated JavaScript as text (default
in -O0 and -O1)
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. The
binary file will also be loaded asynchronously,
which means main() will not be called until
the file is downloaded and applied; you cannot
call any C functions until it arrives. (Call
yourself from main() to know when all async
stuff has happened and it is safe to call
library functions, as main() will only be
called at that time. You can also call
addOnPreMain from a preRun.) (default in -O2+)
Note the .mem file should be in the same
directory as the .js file when the code is run.
-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 Runs the main application code in a worker, proxying
events to it and output from it.
If emitting htmlL, this emits an html and a js file,
with the js to be run in a worker. If emitting
js, the target filename contains the part to be run
on the main thread, while a second js file with
suffix ".worker.js" will contain the worker portion.
--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'.
--valid_abspath path Whitelist an absolute path to prevent warnings about
absolute include paths.
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) 2014 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
code = subprocess.call([shared.CLANG, '-v'])
shared.check_sanity(force=True)
exit(code)
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 + ['-D__EMSCRIPTEN__', '-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] + shared.COMPILER_OPTS + 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))
def in_directory(root, child):
# make both path absolute
root = os.path.realpath(root)
child = os.path.realpath(child)
# return true, if the common prefix of both is equal to directory
# e.g. /a/b/c/d.rst and directory is /a/b, the common prefix is /a/b
return os.path.commonprefix([root, child]) == root
# 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
profiling = False
emit_symbol_map = False
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 = None
use_preload_cache = False
no_heap_copy = False
proxy_to_worker = False
default_object_extension = '.o'
valid_abspaths = []
def is_valid_abspath(path_name):
for valid_abspath in valid_abspaths:
if in_directory(valid_abspath, path_name):
return True
return 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':
llvm_opts = ['-Os']
requested_level = 2
settings_changes.append('INLINING_LIMIT=50')
elif requested_level == 'z':
llvm_opts = ['-Oz']
requested_level = 2
settings_changes.append('INLINING_LIMIT=25')
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] == '-profiling':
debug_level = 2
profiling = True
newargs[i] = ''
elif newargs[i] == '--emit-symbol-map':
emit_symbol_map = True
newargs[i] = ''
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('-v invocation: ' + ' '.join(sys.argv))
shared.apply_configuration() # reset config to pick up change
shared.check_sanity(force=True)
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':
logging.warning('jcache is deprecated')
jcache = True
newargs[i] = ''
elif newargs[i] == '--clear-cache':
newargs[i] = ''
logging.warning('clearing cache')
shared.Cache.erase()
shared.check_sanity(force=True) # this is a good time for a sanity check
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] == '--valid-abspath':
valid_abspaths.append(newargs[i+1])
newargs[i] = ''
newargs[i+1] = ''
elif newargs[i].startswith(('-I', '-L')):
path_name = newargs[i][2:]
if not absolute_warning_shown and os.path.isabs(path_name) and not is_valid_abspath(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 memory_init_file is None: memory_init_file = opt_level >= 2
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
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
# These three arrays are used to store arguments of different types for
# type-specific processing. In order to shuffle the arguments back together
# after processing, all of these arrays hold tuples (original_index, value).
# Note that the index part of the tuple can have a fractional part for input
# arguments that expand into multiple processed arguments, as in -Wl,-f1,-f2.
input_files = []
libs = []
link_flags = []
# All of the above arg lists entries contain indexes into the full argument
# list. In order to add extra implicit args (embind.cc, etc) below, we keep a
# counter for the next index that should be used.
next_arg_index = len(newargs)
has_source_inputs = False
has_header_inputs = False
lib_dirs = [shared.path_from_root('system', 'local', 'lib'),
shared.path_from_root('system', 'lib')]
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 <target>, so all these should be inputs
newargs[i] = ''
if arg_ending.endswith(SOURCE_ENDINGS):
input_files.append((i, arg))
has_source_inputs = True
elif arg_ending.endswith(HEADER_ENDINGS):
input_files.append((i, 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((i, 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((i, 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((i, arg[2:]))
newargs[i] = ''
elif arg.startswith('-Wl,'):
# Multiple comma separated link flags can be specified. Create fake
# fractional indices for these: -Wl,a,b,c,d at index 4 becomes:
# (4, a), (4.25, b), (4.5, c), (4.75, d)
link_flags_to_add = arg.split(',')[1:]
for flag_index, flag in enumerate(link_flags_to_add):
# Only keep flags that shared.Building.link knows how to deal with.
# We currently can't handle flags with options (like
# -Wl,-rpath,/bin:/lib, where /bin:/lib is an option for the -rpath
# flag).
if flag in SUPPORTED_LINKER_FLAGS:
link_flags.append((i + float(flag_index) / len(link_flags_to_add), flag))
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'
final_ending = ('.' + final_suffix) if len(final_suffix) > 0 else ''
# Find library files
for i, 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((i, 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 = [(i, input_file) for (i, input_file) in input_files if check(input_file)]
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((next_arg_index, shared.path_from_root('system', 'lib', 'embind', 'bind.cpp')))
next_arg_index += 1
# 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)
else:
value = value.replace('\\', '\\\\')
exec('shared.Settings.' + key + ' = ' + value)
if key == 'EXPORTED_FUNCTIONS':
shared.Settings.ORIGINAL_EXPORTED_FUNCTIONS = shared.Settings.EXPORTED_FUNCTIONS[:] # used for warnings in emscripten.py
fastcomp = os.environ.get('EMCC_FAST_COMPILER') != '0'
if fastcomp:
shared.Settings.ASM_JS = 1 if opt_level > 0 else 2
try:
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 - use SAFE_HEAP instead'
assert shared.Settings.SAFE_DYNCALLS == 0, 'safe dyncalls 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_ASMJS_UNKNOWN_EMSCRIPTEN == 1, 'fastcomp requires asmjs-unknown-emscripten'
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 shared.Settings.INIT_HEAP == 0, 'HEAP_INIT is not supported in fastcomp (and should never be needed except for debugging)'
assert not shared.Settings.RUNTIME_TYPE_INFO, 'RUNTIME_TYPE_INFO is not supported in fastcomp'
assert not shared.Settings.CORRUPTION_CHECK, 'CORRUPTION_CHECK is not supported in asm.js mode, which is what fastcomp can emit (you can use non-asm.js mode in non-fastcomp)'
assert not shared.Settings.MAIN_MODULE and not shared.Settings.SIDE_MODULE, 'Linking modules is not supported in fastcomp'
except Exception, e:
logging.error('Compiler settings are incompatible with fastcomp. You can fall back to the older compiler core, although that is not recommended, see https://github.com/kripken/emscripten/wiki/LLVM-Backend')
raise e
if jcache:
logging.warning('jcache is deprecated and not supported in fastcomp (you should not need it anyhow), disabling')
jcache = False
pre_fastcomp_opts = []
fastcomp_opts = []
if shared.Settings.NO_EXIT_RUNTIME:
pre_fastcomp_opts += ['-emscripten-no-exit-runtime']
if not llvm_lto: fastcomp_opts += ['-globalopt', '-globaldce']
fastcomp_opts += ['-pnacl-abi-simplify-preopt', '-pnacl-abi-simplify-postopt']
if shared.Settings.DISABLE_EXCEPTION_CATCHING != 1:
fastcomp_opts += ['-enable-emscripten-cxx-exceptions']
if shared.Settings.DISABLE_EXCEPTION_CATCHING == 2:
fastcomp_opts += ['-emscripten-cxx-exceptions-whitelist=' + ','.join(shared.Settings.EXCEPTION_CATCHING_WHITELIST or ['fake'])]
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.warning('Disabling asm.js validation for memory growth (memory can grow, but you lose some amount of speed)');
shared.Settings.ASM_JS = 2
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 not (shared.Settings.NO_DYNAMIC_EXECUTION and closure), 'cannot have both NO_DYNAMIC_EXECUTION and closure compiler enabled at the same time'
if closure:
shared.Settings.CLOSURE_COMPILER = 1
assert os.path.exists(shared.CLOSURE_COMPILER), logging.error('fatal: Closure compiler (%s) does not exist', shared.CLOSURE_COMPILER)
assert shared.LLVM_TARGET in shared.COMPILER_OPTS
if shared.LLVM_TARGET == 'i386-pc-linux-gnu':
shared.Settings.TARGET_X86 = 1
shared.Settings.TARGET_ASMJS_UNKNOWN_EMSCRIPTEN = 0
assert 'asmjs-unknown-emscripten' not in shared.COMPILER_OPTS
elif shared.LLVM_TARGET == 'asmjs-unknown-emscripten' or \
shared.LLVM_TARGET == 'le32-unknown-nacl':
# For temporary compatibility, treat 'le32-unknown-nacl' as 'asmjs-unknown-emscripten'.
shared.Settings.TARGET_ASMJS_UNKNOWN_EMSCRIPTEN = 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
shared.Settings.EXPORT_ALL = 1
elif shared.Settings.SIDE_MODULE:
assert not shared.Settings.MAIN_MODULE
if shared.Settings.MAIN_MODULE or shared.Settings.SIDE_MODULE:
memory_init_file = False # 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 not fastcomp and 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((next_arg_index, shared.path_from_root('third_party', 'stb_image.c')))
next_arg_index += 1
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'
assert not (bind and shared.Settings.NO_DYNAMIC_EXECUTION), 'NO_DYNAMIC_EXECUTION disallows embind'
if proxy_to_worker:
shared.Settings.PROXY_TO_WORKER = 1
if js_opts:
shared.Settings.RUNNING_JS_OPTS = 1
shared.Settings.EMSCRIPTEN_VERSION = shared.EMSCRIPTEN_VERSION
shared.Settings.OPT_LEVEL = opt_level
shared.Settings.DEBUG_LEVEL = debug_level
## 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:
headers = [header for _, header in input_files]
for header in headers:
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(headers) + ' : ' + header
args = newargs + shared.EMSDK_CXX_OPTS + headers
if specified_target:
args += ['-o', specified_target]
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(0)
def get_bitcode_file(input_file):
if final_suffix not in JS_CONTAINING_SUFFIXES:
# no need for a temp file, just emit to the right place
if len(input_files) == 1:
# can just emit directly to the target
if specified_target:
if specified_target.endswith('/') or specified_target.endswith('\\') or os.path.isdir(specified_target):
return os.path.join(specified_target, os.path.basename(unsuffixed(input_file))) + default_object_extension
return specified_target
return unsuffixed(input_file) + final_ending
return unsuffixed(input_file) + default_object_extension
return in_temp(unsuffixed(uniquename(input_file)) + default_object_extension)
# First, generate LLVM bitcode. For each input file, we get base.o with bitcode
for i, 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)
output_file = get_bitcode_file(input_file)
temp_files.append((i, 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((i, 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((i, temp_file))
elif file_ending.endswith(ASSEMBLY_ENDINGS):
if not LEAVE_INPUTS_RAW:
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((i, 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 pos, (_, input_file) in enumerate(input_files):
file_ending = filename_type_ending(input_file)
if file_ending.endswith(SOURCE_ENDINGS):
(_, temp_file) = temp_files[pos]
logging.debug('optimizing %s', input_file)
#if DEBUG: shutil.copyfile(temp_file, os.path.join(TEMP_DIR, 'to_opt.bc') # useful when LLVM opt aborts
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:
safe_move(get_bitcode_file(input_file), unsuffixed_basename(input_file) + final_ending)
else:
if len(input_files) == 1:
_, input_file = input_files[0]
_, temp_file = temp_files[0]
safe_move(temp_file, specified_target if specified_target else unsuffixed_basename(input_file) + final_ending)
temp_output_base = unsuffixed(temp_file)
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 + default_object_extension, specified_target)
with open(os.path.join(os.path.dirname(specified_target), os.path.basename(unsuffixed(input_file) + '.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)
# Sort arg tuples and pass the extracted values to link.
link_args = [f for (i, f) in sorted(temp_files)]
shared.Building.link(link_args, specified_target)
logging.debug('stopping at bitcode')
exit(0)
log_time('process 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([f for _, f in sorted(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][1]) in BITCODE_ENDINGS or suffix(temp_files[0][1]) in DYNAMICLIB_ENDINGS) and shared.Building.is_ar(temp_files[0][1])):
linker_inputs = [val for _, val in sorted(temp_files + link_flags)] + extra_files_to_link
logging.debug('linking: ' + str(linker_inputs))
shared.Building.link(linker_inputs, in_temp(target_basename + '.bc'), force_archive_contents=len([temp for i, temp in temp_files if not temp.endswith(STATICLIB_ENDINGS)]) == 0)
final = in_temp(target_basename + '.bc')
else:
if not LEAVE_INPUTS_RAW:
_, temp_file = temp_files[0]
shutil.move(temp_file, in_temp(target_basename + '.bc'))
final = in_temp(target_basename + '.bc')
else:
_, input_file = input_files[0]
final = in_temp(input_file)
shutil.copyfile(input_file, 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 = pre_fastcomp_opts + 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 and not fastcomp:
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 and debug_level < 4:
# 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 shared.Settings.RELOOP and not shared.Settings.ASM_JS:
js_optimizer_queue += ['optimizeShiftsAggressive', get_eliminate()] # aggressive shifts optimization requires loops, it breaks on switches
# simplify ifs if it is ok to make the code somewhat unreadable, and unless outlining (simplified ifs
# with commaified code breaks late aggressive variable elimination)
if shared.Settings.SIMPLIFY_IFS and (debug_level == 0 or profiling) and shared.Settings.OUTLINING_LIMIT == 0: js_optimizer_queue += ['simplifyIfs']
if 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:
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 emit_symbol_map: js_optimizer_queue += ['symbolMap='+target+'.symbols']
if debug_level == 0: js_optimizer_queue += ['minifyWhitespace']
if shared.Settings.ASM_JS:
if closure:
js_optimizer_queue += ['closure']
elif debug_level <= 2 and not shared.Settings.MAIN_MODULE and not shared.Settings.SIDE_MODULE:
js_optimizer_queue += ['cleanup']
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 }}}', '<script>' + open(shared.path_from_root('src', 'webGLClient.js')).read() + '\n' + open(shared.path_from_root('src', 'proxyClient.js')).read().replace('{{{ filename }}}', shared.Settings.PROXY_TO_WORKER_FILENAME or target_basename) + '</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 = '''<script async type="text/javascript" src="%s"></script>''' % 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 = '''<script>%s</script>''' % 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 }}}', '<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)
if proxy_to_worker:
worker_target_basename = target_basename + '.worker'
open(target, 'w').write(open(shared.path_from_root('src', 'webGLClient.js')).read() + '\n' + open(shared.path_from_root('src', 'proxyClient.js')).read().replace('{{{ filename }}}', shared.Settings.PROXY_TO_WORKER_FILENAME or worker_target_basename))
shutil.move(final, target[:-3] + '.worker.js')
else:
# copy final JS to output normally
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)
