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emscripten.py
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#!/usr/bin/env python2
'''
You should normally never use this! Use emcc instead.
This is a small wrapper script around the core JS compiler. This calls that
compiler with the settings given to it. It can also read data from C/C++
header files (so that the JS compiler can see the constants in those
headers, for the libc implementation in JS).
'''
import os, sys, json, optparse, subprocess, re, time, multiprocessing, string, logging
from tools import shared
from tools import jsrun, cache as cache_module, tempfiles
from tools.response_file import read_response_file
from tools.shared import WINDOWS
__rootpath__ = os.path.abspath(os.path.dirname(__file__))
def path_from_root(*pathelems):
"""Returns the absolute path for which the given path elements are
relative to the emscripten root.
"""
return os.path.join(__rootpath__, *pathelems)
def get_configuration():
if hasattr(get_configuration, 'configuration'):
return get_configuration.configuration
configuration = shared.Configuration(environ=os.environ)
get_configuration.configuration = configuration
return configuration
def scan(ll, settings):
# blockaddress(@main, %23)
blockaddrs = []
for blockaddr in re.findall('blockaddress\([^)]*\)', ll):
b = blockaddr.split('(')[1][:-1].split(', ')
blockaddrs.append(b)
if len(blockaddrs) > 0:
settings['NECESSARY_BLOCKADDRS'] = blockaddrs
NUM_CHUNKS_PER_CORE = 1.0
MIN_CHUNK_SIZE = 1024*1024
MAX_CHUNK_SIZE = float(os.environ.get('EMSCRIPT_MAX_CHUNK_SIZE') or 'inf') # configuring this is just for debugging purposes
STDERR_FILE = os.environ.get('EMCC_STDERR_FILE')
if STDERR_FILE:
STDERR_FILE = os.path.abspath(STDERR_FILE)
logging.info('logging stderr in js compiler phase into %s' % STDERR_FILE)
STDERR_FILE = open(STDERR_FILE, 'w')
def process_funcs((i, funcs_file, meta, settings_file, compiler, forwarded_file, libraries, compiler_engine, DEBUG)):
try:
#print >> sys.stderr, 'running', str([settings_file, funcs_file, 'funcs', forwarded_file] + libraries).replace("'/", "'") # can use this in src/compiler_funcs.html arguments,
# # just copy temp dir to under this one
out = jsrun.run_js(
compiler,
engine=compiler_engine,
args=[settings_file, funcs_file, 'funcs', forwarded_file] + libraries,
stdout=subprocess.PIPE,
stderr=STDERR_FILE,
cwd=path_from_root('src'))
except KeyboardInterrupt:
# Python 2.7 seems to lock up when a child process throws KeyboardInterrupt
raise Exception()
if DEBUG: logging.debug('.')
return out
def emscript(infile, settings, outfile, libraries=[], compiler_engine=None,
temp_files=None, DEBUG=None, DEBUG_CACHE=None):
"""Runs the emscripten LLVM-to-JS compiler. We parallelize as much as possible
Args:
infile: The path to the input LLVM assembly file.
settings: JSON-formatted settings that override the values
defined in src/settings.js.
outfile: The file where the output is written.
"""
compiler = path_from_root('src', 'compiler.js')
# Parallelization: We run 3 phases:
# 1 aka 'pre' : Process types and metadata and so forth, and generate the preamble.
# 2 aka 'funcs': Process functions. We can parallelize this, working on each function independently.
# 3 aka 'post' : Process globals, generate postamble and finishing touches.
if DEBUG: logging.debug('emscript: ll=>js')
# Pre-scan ll and alter settings as necessary
if DEBUG: t = time.time()
ll = open(infile).read()
scan(ll, settings)
total_ll_size = len(ll)
if DEBUG: logging.debug(' emscript: scan took %s seconds' % (time.time() - t))
# Split input into the relevant parts for each phase
if DEBUG: t = time.time()
pre = []
funcs = [] # split up functions here, for parallelism later
meta_start = ll.find('\n!')
if meta_start > 0:
meta = ll[meta_start:]
else:
meta = ''
meta_start = -1
start = ll.find('\n') if ll[0] == ';' else 0 # ignore first line, which contains ; ModuleID = '/dir name'
func_start = start
last = func_start
while 1:
last = func_start
func_start = ll.find('\ndefine ', func_start)
if func_start > last:
pre.append(ll[last:min(func_start+1, meta_start) if meta_start > 0 else func_start+1] + '\n')
if func_start < 0:
pre.append(ll[last:meta_start] + '\n')
break
header = ll[func_start+1:ll.find('\n', func_start+1)+1]
end = ll.find('\n}', func_start)
last = end+3
funcs.append((header, ll[func_start+1:last]))
pre.append(header + '}\n')
func_start = last
ll = None
if DEBUG and len(meta) > 1024*1024: logging.debug('emscript warning: large amounts of metadata, will slow things down')
if DEBUG: logging.debug(' emscript: split took %s seconds' % (time.time() - t))
if len(funcs) == 0:
logging.error('No functions to process. Make sure you prevented LLVM from eliminating them as dead (use EXPORTED_FUNCTIONS if necessary, see the FAQ)')
#if DEBUG:
# logging.debug('========= pre ================\n')
# logging.debug(''.join(pre))
# logging.debug('========== funcs ===============\n')
# for func in funcs:
# logging.debug('\n// ===\n\n', ''.join(func))
# logging.debug('=========================\n')
# Save settings to a file to work around v8 issue 1579
settings_file = temp_files.get('.txt').name
def save_settings():
global settings_text
settings_text = json.dumps(settings, sort_keys=True)
s = open(settings_file, 'w')
s.write(settings_text)
s.close()
save_settings()
# Phase 1 - pre
if DEBUG: t = time.time()
pre_file = temp_files.get('.pre.ll').name
pre_input = ''.join(pre) + '\n' + meta
out = None
if not out:
open(pre_file, 'w').write(pre_input)
#print >> sys.stderr, 'running', str([settings_file, pre_file, 'pre'] + libraries).replace("'/", "'") # see funcs
out = jsrun.run_js(compiler, compiler_engine, [settings_file, pre_file, 'pre'] + libraries, stdout=subprocess.PIPE, stderr=STDERR_FILE,
cwd=path_from_root('src'))
assert '//FORWARDED_DATA:' in out, 'Did not receive forwarded data in pre output - process failed?'
pre, forwarded_data = out.split('//FORWARDED_DATA:')
forwarded_file = temp_files.get('.json').name
pre_input = None
open(forwarded_file, 'w').write(forwarded_data)
if DEBUG: logging.debug(' emscript: phase 1 took %s seconds' % (time.time() - t))
indexed_functions = set()
forwarded_json = json.loads(forwarded_data)
for key in forwarded_json['Functions']['indexedFunctions'].iterkeys():
indexed_functions.add(key)
# Phase 2 - func
cores = int(os.environ.get('EMCC_CORES') or multiprocessing.cpu_count())
assert cores >= 1
if cores > 1:
intended_num_chunks = int(round(cores * NUM_CHUNKS_PER_CORE))
chunk_size = max(MIN_CHUNK_SIZE, total_ll_size / intended_num_chunks)
chunk_size += 3*len(meta) # keep ratio of lots of function code to meta (expensive to process, and done in each parallel task)
chunk_size = min(MAX_CHUNK_SIZE, chunk_size)
else:
chunk_size = MAX_CHUNK_SIZE # if 1 core, just use the max chunk size
if DEBUG: t = time.time()
if settings.get('ASM_JS'):
settings['EXPORTED_FUNCTIONS'] = forwarded_json['EXPORTED_FUNCTIONS']
save_settings()
chunks = cache_module.chunkify(funcs, chunk_size)
#sys.exit(1)
#chunks = [chunks[0]] # pick specific chunks for debugging/profiling
funcs = None
# TODO: minimize size of forwarded data from funcs to what we actually need
if len(chunks) > 0:
if cores == 1 and total_ll_size < MAX_CHUNK_SIZE:
assert len(chunks) == 1, 'no point in splitting up without multiple cores'
if DEBUG: logging.debug(' emscript: phase 2 working on %d chunks %s (intended chunk size: %.2f MB, meta: %.2f MB, forwarded: %.2f MB, total: %.2f MB)' % (len(chunks), ('using %d cores' % cores) if len(chunks) > 1 else '', chunk_size/(1024*1024.), len(meta)/(1024*1024.), len(forwarded_data)/(1024*1024.), total_ll_size/(1024*1024.)))
commands = []
for i in range(len(chunks)):
funcs_file = temp_files.get('.func_%d.ll' % i).name
f = open(funcs_file, 'w')
f.write(chunks[i])
chunks[i] = None # leave chunks array alive (need its length later)
f.write('\n')
f.write(meta)
f.close()
commands.append(
(i, funcs_file, meta, settings_file, compiler, forwarded_file, libraries, compiler_engine,# + ['--prof'],
DEBUG)
)
if len(chunks) > 1:
pool = multiprocessing.Pool(processes=cores)
outputs = pool.map(process_funcs, commands, chunksize=1)
elif len(chunks) == 1:
outputs = [process_funcs(commands[0])]
commands = None
else:
outputs = []
chunks = None
outputs = [output.split('//FORWARDED_DATA:') for output in outputs]
for output in outputs:
assert len(output) == 2, 'Did not receive forwarded data in an output - process failed? We only got: ' + output[0][-3000:]
if DEBUG: logging.debug(' emscript: phase 2 took %s seconds' % (time.time() - t))
if DEBUG: t = time.time()
# merge forwarded data
if settings.get('ASM_JS'):
all_exported_functions = set(settings['EXPORTED_FUNCTIONS']) # both asm.js and otherwise
for additional_export in settings['DEFAULT_LIBRARY_FUNCS_TO_INCLUDE']: # additional functions to export from asm, if they are implemented
all_exported_functions.add('_' + additional_export)
exported_implemented_functions = set()
for func_js, curr_forwarded_data in outputs:
curr_forwarded_json = json.loads(curr_forwarded_data)
forwarded_json['Types']['hasInlineJS'] = forwarded_json['Types']['hasInlineJS'] or curr_forwarded_json['Types']['hasInlineJS']
forwarded_json['Types']['usesSIMD'] = forwarded_json['Types']['usesSIMD'] or curr_forwarded_json['Types']['usesSIMD']
forwarded_json['Types']['preciseI64MathUsed'] = forwarded_json['Types']['preciseI64MathUsed'] or curr_forwarded_json['Types']['preciseI64MathUsed']
for key, value in curr_forwarded_json['Functions']['blockAddresses'].iteritems():
forwarded_json['Functions']['blockAddresses'][key] = value
for key in curr_forwarded_json['Functions']['indexedFunctions'].iterkeys():
indexed_functions.add(key)
if settings.get('ASM_JS'):
export_bindings = settings['EXPORT_BINDINGS']
export_all = settings['EXPORT_ALL']
for key in curr_forwarded_json['Functions']['implementedFunctions'].iterkeys():
if key in all_exported_functions or export_all or (export_bindings and key.startswith('_emscripten_bind')):
exported_implemented_functions.add(key)
for key, value in curr_forwarded_json['Functions']['unimplementedFunctions'].iteritems():
forwarded_json['Functions']['unimplementedFunctions'][key] = value
for key, value in curr_forwarded_json['Functions']['neededTables'].iteritems():
forwarded_json['Functions']['neededTables'][key] = value
if settings.get('ASM_JS'):
parts = pre.split('// ASM_LIBRARY FUNCTIONS\n')
if len(parts) > 1:
pre = parts[0]
outputs.append([parts[1]])
funcs_js = [output[0] for output in outputs]
outputs = None
if DEBUG: logging.debug(' emscript: phase 2b took %s seconds' % (time.time() - t))
if DEBUG: t = time.time()
# calculations on merged forwarded data
forwarded_json['Functions']['indexedFunctions'] = {}
i = settings['FUNCTION_POINTER_ALIGNMENT'] # universal counter
if settings['ASM_JS']: i += settings['RESERVED_FUNCTION_POINTERS']*settings['FUNCTION_POINTER_ALIGNMENT']
base_fp = i
table_counters = {} # table-specific counters
alias = settings['ASM_JS'] and settings['ALIASING_FUNCTION_POINTERS']
sig = None
for indexed in indexed_functions:
if alias:
sig = forwarded_json['Functions']['implementedFunctions'].get(indexed) or forwarded_json['Functions']['unimplementedFunctions'].get(indexed)
assert sig, indexed
if sig not in table_counters:
table_counters[sig] = base_fp
curr = table_counters[sig]
table_counters[sig] += settings['FUNCTION_POINTER_ALIGNMENT']
else:
curr = i
i += settings['FUNCTION_POINTER_ALIGNMENT']
#logging.debug('function indexing ' + str([indexed, curr, sig]))
forwarded_json['Functions']['indexedFunctions'][indexed] = curr # make sure not to modify this python object later - we use it in indexize
def split_32(x):
x = int(x)
return '%d,%d,%d,%d' % (x&255, (x >> 8)&255, (x >> 16)&255, (x >> 24)&255)
indexing = forwarded_json['Functions']['indexedFunctions']
def indexize_mem(js):
return re.sub(r"\"?'?{{ FI_([\w\d_$]+) }}'?\"?,0,0,0", lambda m: split_32(indexing.get(m.groups(0)[0]) or 0), js)
def indexize(js):
return re.sub(r"'{{ FI_([\w\d_$]+) }}'", lambda m: str(indexing.get(m.groups(0)[0]) or 0), js)
blockaddrs = forwarded_json['Functions']['blockAddresses']
def blockaddrsize_mem(js):
return re.sub(r'"?{{{ BA_([\w\d_$]+)\|([\w\d_$]+) }}}"?,0,0,0', lambda m: split_32(blockaddrs[m.groups(0)[0]][m.groups(0)[1]]), js)
def blockaddrsize(js):
return re.sub(r'"?{{{ BA_([\w\d_$]+)\|([\w\d_$]+) }}}"?', lambda m: str(blockaddrs[m.groups(0)[0]][m.groups(0)[1]]), js)
pre = blockaddrsize(blockaddrsize_mem(indexize(indexize_mem(pre))))
if settings.get('ASM_JS'):
# move postsets into the asm module
class PostSets: js = ''
def handle_post_sets(m):
PostSets.js = m.group(0)
return '\n'
pre = re.sub(r'function runPostSets[^}]+}', handle_post_sets, pre)
#if DEBUG: outfile.write('// pre\n')
outfile.write(pre)
pre = None
#if DEBUG: outfile.write('// funcs\n')
# forward
forwarded_data = json.dumps(forwarded_json)
forwarded_file = temp_files.get('.2.json').name
open(forwarded_file, 'w').write(indexize(forwarded_data))
if DEBUG: logging.debug(' emscript: phase 2c took %s seconds' % (time.time() - t))
# Phase 3 - post
if DEBUG: t = time.time()
post_file = temp_files.get('.post.ll').name
open(post_file, 'w').write('\n') # no input, just processing of forwarded data
out = jsrun.run_js(compiler, compiler_engine, [settings_file, post_file, 'post', forwarded_file] + libraries, stdout=subprocess.PIPE, stderr=STDERR_FILE,
cwd=path_from_root('src'))
post, last_forwarded_data = out.split('//FORWARDED_DATA:') # if this fails, perhaps the process failed prior to printing forwarded data?
last_forwarded_json = json.loads(last_forwarded_data)
if settings.get('ASM_JS'):
post_funcs, post_rest = post.split('// EMSCRIPTEN_END_FUNCS\n')
post = post_rest
# Move preAsms to their right place
def move_preasm(m):
contents = m.groups(0)[0]
outfile.write(contents + '\n')
return ''
post_funcs = re.sub(r'/\* PRE_ASM \*/(.*)\n', lambda m: move_preasm(m), post_funcs)
funcs_js += ['\n' + post_funcs + '// EMSCRIPTEN_END_FUNCS\n']
simple = os.environ.get('EMCC_SIMPLE_ASM')
class Counter:
i = 0
j = 0
pre_tables = last_forwarded_json['Functions']['tables']['pre']
del last_forwarded_json['Functions']['tables']['pre']
def make_table(sig, raw):
i = Counter.i
Counter.i += 1
bad = 'b' + str(i)
params = ','.join(['p%d' % p for p in range(len(sig)-1)])
coercions = ';'.join(['p%d = %s' % (p, shared.JS.make_coercion('p%d' % p, sig[p+1], settings)) for p in range(len(sig)-1)]) + ';'
ret = '' if sig[0] == 'v' else ('return %s' % shared.JS.make_initializer(sig[0], settings))
start = raw.index('[')
end = raw.rindex(']')
body = raw[start+1:end].split(',')
for j in range(settings['RESERVED_FUNCTION_POINTERS']):
body[settings['FUNCTION_POINTER_ALIGNMENT'] * (1 + j)] = 'jsCall_%s_%s' % (sig, j)
Counter.j = 0
def fix_item(item):
Counter.j += 1
newline = Counter.j % 30 == 29
if item == '0': return bad if not newline else (bad + '\n')
return item if not newline else (item + '\n')
body = ','.join(map(fix_item, body))
return ('function %s(%s) { %s %s(%d); %s }' % (bad, params, coercions, 'abort' if not settings['ASSERTIONS'] else 'nullFunc', i, ret), ''.join([raw[:start+1], body, raw[end:]]))
infos = [make_table(sig, raw) for sig, raw in last_forwarded_json['Functions']['tables'].iteritems()]
function_tables_defs = '\n'.join([info[0] for info in infos]) + '\n// EMSCRIPTEN_END_FUNCS\n' + '\n'.join([info[1] for info in infos])
asm_setup = ''
maths = ['Math.' + func for func in ['floor', 'abs', 'sqrt', 'pow', 'cos', 'sin', 'tan', 'acos', 'asin', 'atan', 'atan2', 'exp', 'log', 'ceil', 'imul']]
fundamentals = ['Math', 'Int8Array', 'Int16Array', 'Int32Array', 'Uint8Array', 'Uint16Array', 'Uint32Array', 'Float32Array', 'Float64Array']
if settings['ALLOW_MEMORY_GROWTH']: fundamentals.append('byteLength')
math_envs = ['Math.min'] # TODO: move min to maths
asm_setup += '\n'.join(['var %s = %s;' % (f.replace('.', '_'), f) for f in math_envs])
if settings['PRECISE_F32']: maths += ['Math.fround']
basic_funcs = ['abort', 'assert', 'asmPrintInt', 'asmPrintFloat'] + [m.replace('.', '_') for m in math_envs]
if settings['SAFE_HEAP']: basic_funcs += ['SAFE_HEAP_LOAD', 'SAFE_HEAP_STORE', 'SAFE_FT_MASK']
if settings['CHECK_HEAP_ALIGN']: basic_funcs += ['CHECK_ALIGN_2', 'CHECK_ALIGN_4', 'CHECK_ALIGN_8']
if settings['ASSERTIONS']:
basic_funcs += ['nullFunc']
asm_setup += 'function nullFunc(x) { Module["printErr"]("Invalid function pointer called. Perhaps a miscast function pointer (check compilation warnings) or bad vtable lookup (maybe due to derefing a bad pointer, like NULL)?"); abort(x) }\n'
basic_vars = ['STACKTOP', 'STACK_MAX', 'tempDoublePtr', 'ABORT']
basic_float_vars = ['NaN', 'Infinity']
if forwarded_json['Types']['preciseI64MathUsed'] or \
forwarded_json['Functions']['libraryFunctions'].get('_llvm_cttz_i32') or \
forwarded_json['Functions']['libraryFunctions'].get('_llvm_ctlz_i32'):
basic_vars += ['cttz_i8', 'ctlz_i8']
if settings.get('DLOPEN_SUPPORT'):
for sig in last_forwarded_json['Functions']['tables'].iterkeys():
basic_vars.append('F_BASE_%s' % sig)
asm_setup += ' var F_BASE_%s = %s;\n' % (sig, 'FUNCTION_TABLE_OFFSET' if settings.get('SIDE_MODULE') else '0') + '\n'
asm_runtime_funcs = ['stackAlloc', 'stackSave', 'stackRestore', 'setThrew'] + ['setTempRet%d' % i for i in range(10)] + ['getTempRet%d' % i for i in range(10)]
# function tables
function_tables = ['dynCall_' + table for table in last_forwarded_json['Functions']['tables']]
function_tables_impls = []
for sig in last_forwarded_json['Functions']['tables'].iterkeys():
args = ','.join(['a' + str(i) for i in range(1, len(sig))])
arg_coercions = ' '.join(['a' + str(i) + '=' + shared.JS.make_coercion('a' + str(i), sig[i], settings) + ';' for i in range(1, len(sig))])
coerced_args = ','.join([shared.JS.make_coercion('a' + str(i), sig[i], settings) for i in range(1, len(sig))])
ret = ('return ' if sig[0] != 'v' else '') + shared.JS.make_coercion('FUNCTION_TABLE_%s[index&{{{ FTM_%s }}}](%s)' % (sig, sig, coerced_args), sig[0], settings)
function_tables_impls.append('''
function dynCall_%s(index%s%s) {
index = index|0;
%s
%s;
}
''' % (sig, ',' if len(sig) > 1 else '', args, arg_coercions, ret))
for i in range(settings['RESERVED_FUNCTION_POINTERS']):
jsret = ('return ' if sig[0] != 'v' else '') + shared.JS.make_coercion('jsCall_%s(%d%s%s)' % (sig, i, ',' if coerced_args else '', coerced_args), sig[0], settings)
function_tables_impls.append('''
function jsCall_%s_%s(%s) {
%s
%s;
}
''' % (sig, i, args, arg_coercions, jsret))
shared.Settings.copy(settings)
asm_setup += '\n' + shared.JS.make_invoke(sig) + '\n'
basic_funcs.append('invoke_%s' % sig)
if settings.get('RESERVED_FUNCTION_POINTERS'):
asm_setup += '\n' + shared.JS.make_jscall(sig) + '\n'
basic_funcs.append('jsCall_%s' % sig)
if settings.get('DLOPEN_SUPPORT'):
asm_setup += '\n' + shared.JS.make_extcall(sig) + '\n'
basic_funcs.append('extCall_%s' % sig)
# calculate exports
exported_implemented_functions = list(exported_implemented_functions)
exported_implemented_functions.append('runPostSets')
exports = []
if not simple:
for export in exported_implemented_functions + asm_runtime_funcs + function_tables:
exports.append("%s: %s" % (export, export))
exports = '{ ' + ', '.join(exports) + ' }'
else:
exports = '_main'
# calculate globals
try:
del forwarded_json['Variables']['globals']['_llvm_global_ctors'] # not a true variable
except:
pass
# If no named globals, only need externals
global_vars = map(lambda g: g['name'], filter(lambda g: settings['NAMED_GLOBALS'] or g.get('external') or g.get('unIndexable'), forwarded_json['Variables']['globals'].values()))
global_funcs = [key for key, value in forwarded_json['Functions']['libraryFunctions'].iteritems() if value != 2]
def math_fix(g):
return g if not g.startswith('Math_') else g.split('_')[1]
asm_global_funcs = ''.join([' var ' + g.replace('.', '_') + '=global.' + g + ';\n' for g in maths]) + \
''.join([' var ' + g + '=env.' + math_fix(g) + ';\n' for g in basic_funcs + global_funcs])
asm_global_vars = ''.join([' var ' + g + '=env.' + g + '|0;\n' for g in basic_vars + global_vars]) + \
''.join([' var ' + g + '=+env.' + g + ';\n' for g in basic_float_vars])
# In linkable modules, we need to add some explicit globals for global variables that can be linked and used across modules
if settings.get('MAIN_MODULE') or settings.get('SIDE_MODULE'):
assert settings.get('TARGET_ASMJS_UNKNOWN_EMSCRIPTEN'), 'TODO: support x86 target when linking modules (needs offset of 4 and not 8 here)'
for key, value in forwarded_json['Variables']['globals'].iteritems():
if value.get('linkable'):
init = forwarded_json['Variables']['indexedGlobals'][key] + 8 # 8 is Runtime.GLOBAL_BASE / STATIC_BASE
if settings.get('SIDE_MODULE'): init = '(H_BASE+' + str(init) + ')|0'
asm_global_vars += ' var %s=%s;\n' % (key, str(init))
# sent data
the_global = '{ ' + ', '.join(['"' + math_fix(s) + '": ' + s for s in fundamentals]) + ' }'
sending = '{ ' + ', '.join(['"' + math_fix(s) + '": ' + s for s in basic_funcs + global_funcs + basic_vars + basic_float_vars + global_vars]) + ' }'
# received
if not simple:
receiving = ';\n'.join(['var ' + s + ' = Module["' + s + '"] = asm["' + s + '"]' for s in exported_implemented_functions + function_tables])
else:
receiving = 'var _main = Module["_main"] = asm;'
# finalize
if DEBUG: logging.debug('asm text sizes' + str([map(len, funcs_js), len(asm_setup), len(asm_global_vars), len(asm_global_funcs), len(pre_tables), len('\n'.join(function_tables_impls)), len(function_tables_defs.replace('\n', '\n ')), len(exports), len(the_global), len(sending), len(receiving)]))
funcs_js = ['''
%s
function asmPrintInt(x, y) {
Module.print('int ' + x + ',' + y);// + ' ' + new Error().stack);
}
function asmPrintFloat(x, y) {
Module.print('float ' + x + ',' + y);// + ' ' + new Error().stack);
}
// EMSCRIPTEN_START_ASM
var asm = (function(global, env, buffer) {
%s
%s
''' % (asm_setup, "'use asm';" if not forwarded_json['Types']['hasInlineJS'] and not settings['SIDE_MODULE'] and settings['ASM_JS'] == 1 else "'almost asm';",
'''
var HEAP8 = new global.Int8Array(buffer);
var HEAP16 = new global.Int16Array(buffer);
var HEAP32 = new global.Int32Array(buffer);
var HEAPU8 = new global.Uint8Array(buffer);
var HEAPU16 = new global.Uint16Array(buffer);
var HEAPU32 = new global.Uint32Array(buffer);
var HEAPF32 = new global.Float32Array(buffer);
var HEAPF64 = new global.Float64Array(buffer);
''' if not settings['ALLOW_MEMORY_GROWTH'] else '''
var Int8View = global.Int8Array;
var Int16View = global.Int16Array;
var Int32View = global.Int32Array;
var Uint8View = global.Uint8Array;
var Uint16View = global.Uint16Array;
var Uint32View = global.Uint32Array;
var Float32View = global.Float32Array;
var Float64View = global.Float64Array;
var HEAP8 = new Int8View(buffer);
var HEAP16 = new Int16View(buffer);
var HEAP32 = new Int32View(buffer);
var HEAPU8 = new Uint8View(buffer);
var HEAPU16 = new Uint16View(buffer);
var HEAPU32 = new Uint32View(buffer);
var HEAPF32 = new Float32View(buffer);
var HEAPF64 = new Float64View(buffer);
var byteLength = global.byteLength;
''') + '\n' + asm_global_vars + '''
var __THREW__ = 0;
var threwValue = 0;
var setjmpId = 0;
var undef = 0;
var tempInt = 0, tempBigInt = 0, tempBigIntP = 0, tempBigIntS = 0, tempBigIntR = 0.0, tempBigIntI = 0, tempBigIntD = 0, tempValue = 0, tempDouble = 0.0;
''' + ''.join(['''
var tempRet%d = 0;''' % i for i in range(10)]) + '\n' + asm_global_funcs] + [' var tempFloat = %s;\n' % ('Math_fround(0)' if settings.get('PRECISE_F32') else '0.0')] + ([' const f0 = Math_fround(0);\n'] if settings.get('PRECISE_F32') else []) + ['''
// EMSCRIPTEN_START_FUNCS
function stackAlloc(size) {
size = size|0;
var ret = 0;
ret = STACKTOP;
STACKTOP = (STACKTOP + size)|0;
STACKTOP = (STACKTOP + 7)&-8;
return ret|0;
}
function stackSave() {
return STACKTOP|0;
}
function stackRestore(top) {
top = top|0;
STACKTOP = top;
}
function setThrew(threw, value) {
threw = threw|0;
value = value|0;
if ((__THREW__|0) == 0) {
__THREW__ = threw;
threwValue = value;
}
}
function copyTempFloat(ptr) {
ptr = ptr|0;
HEAP8[tempDoublePtr>>0] = HEAP8[ptr>>0];
HEAP8[tempDoublePtr+1>>0] = HEAP8[ptr+1>>0];
HEAP8[tempDoublePtr+2>>0] = HEAP8[ptr+2>>0];
HEAP8[tempDoublePtr+3>>0] = HEAP8[ptr+3>>0];
}
function copyTempDouble(ptr) {
ptr = ptr|0;
HEAP8[tempDoublePtr>>0] = HEAP8[ptr>>0];
HEAP8[tempDoublePtr+1>>0] = HEAP8[ptr+1>>0];
HEAP8[tempDoublePtr+2>>0] = HEAP8[ptr+2>>0];
HEAP8[tempDoublePtr+3>>0] = HEAP8[ptr+3>>0];
HEAP8[tempDoublePtr+4>>0] = HEAP8[ptr+4>>0];
HEAP8[tempDoublePtr+5>>0] = HEAP8[ptr+5>>0];
HEAP8[tempDoublePtr+6>>0] = HEAP8[ptr+6>>0];
HEAP8[tempDoublePtr+7>>0] = HEAP8[ptr+7>>0];
}
''' + ''.join(['''
function setTempRet%d(value) {
value = value|0;
tempRet%d = value;
}
''' % (i, i) for i in range(10)]) + ''.join(['''
function getTempRet%d() {
return tempRet%d|0;
}
''' % (i, i) for i in range(10)])] + [PostSets.js + '\n'] + funcs_js + ['''
%s
return %s;
})
// EMSCRIPTEN_END_ASM
(%s, %s, buffer);
%s;
''' % (pre_tables + '\n'.join(function_tables_impls) + '\n' + function_tables_defs.replace('\n', '\n '), exports, the_global, sending, receiving)]
if not settings.get('SIDE_MODULE'):
funcs_js.append('''
Runtime.stackAlloc = asm['stackAlloc'];
Runtime.stackSave = asm['stackSave'];
Runtime.stackRestore = asm['stackRestore'];
Runtime.setTempRet0 = asm['setTempRet0'];
Runtime.getTempRet0 = asm['getTempRet0'];
''')
# Set function table masks
masks = {}
max_mask = 0
for sig, table in last_forwarded_json['Functions']['tables'].iteritems():
mask = table.count(',')
masks[sig] = str(mask)
max_mask = max(mask, max_mask)
def function_table_maskize(js, masks):
def fix(m):
sig = m.groups(0)[0]
return masks[sig]
return re.sub(r'{{{ FTM_([\w\d_$]+) }}}', lambda m: fix(m), js) # masks[m.groups(0)[0]]
funcs_js = map(lambda js: function_table_maskize(js, masks), funcs_js)
if settings.get('DLOPEN_SUPPORT'):
funcs_js.append('''
asm.maxFunctionIndex = %(max_mask)d;
DLFCN.registerFunctions(asm, %(max_mask)d+1, %(sigs)s, Module);
Module.SYMBOL_TABLE = SYMBOL_TABLE;
''' % { 'max_mask': max_mask, 'sigs': str(map(str, last_forwarded_json['Functions']['tables'].keys())) })
else:
function_tables_defs = '\n'.join([table for table in last_forwarded_json['Functions']['tables'].itervalues()])
outfile.write(function_tables_defs)
funcs_js = ['''
// EMSCRIPTEN_START_FUNCS
'''] + funcs_js + ['''
// EMSCRIPTEN_END_FUNCS
''']
# Create symbol table for self-dlopen
if settings.get('DLOPEN_SUPPORT'):
symbol_table = {}
for k, v in forwarded_json['Variables']['indexedGlobals'].iteritems():
if forwarded_json['Variables']['globals'][k]['named']:
symbol_table[k] = str(v + forwarded_json['Runtime']['GLOBAL_BASE'])
for raw in last_forwarded_json['Functions']['tables'].itervalues():
if raw == '': continue
table = map(string.strip, raw[raw.find('[')+1:raw.find(']')].split(","))
for i in range(len(table)):
value = table[i]
if value != '0':
if settings.get('SIDE_MODULE'):
symbol_table[value] = 'FUNCTION_TABLE_OFFSET+' + str(i)
else:
symbol_table[value] = str(i)
outfile.write("var SYMBOL_TABLE = %s;" % json.dumps(symbol_table).replace('"', ''))
for i in range(len(funcs_js)): # do this loop carefully to save memory
funcs_js_item = funcs_js[i]
funcs_js[i] = None
funcs_js_item = indexize(funcs_js_item)
funcs_js_item = blockaddrsize(funcs_js_item)
if WINDOWS: funcs_js_item = funcs_js_item.replace('\r\n', '\n') # Normalize to UNIX line endings, otherwise writing to text file will duplicate \r\n to \r\r\n!
outfile.write(funcs_js_item)
funcs_js = None
indexized = indexize(post)
if WINDOWS: indexized = indexized.replace('\r\n', '\n') # Normalize to UNIX line endings, otherwise writing to text file will duplicate \r\n to \r\r\n!
outfile.write(indexized)
outfile.close()
if DEBUG: logging.debug(' emscript: phase 3 took %s seconds' % (time.time() - t))
# emscript_fast: emscript'en code using the 'fast' compilation path, using
# an LLVM backend
# FIXME: this is just a copy-paste of normal emscript(), and we trample it
# if the proper env var is set (see below). we should refactor to
# share code between the two, once emscript_fast stabilizes (or,
# leaving it separate like it is will make it trivial to rip out
# if the experiment fails)
def emscript_fast(infile, settings, outfile, libraries=[], compiler_engine=None,
temp_files=None, DEBUG=None, DEBUG_CACHE=None):
"""Runs the emscripten LLVM-to-JS compiler.
Args:
infile: The path to the input LLVM assembly file.
settings: JSON-formatted settings that override the values
defined in src/settings.js.
outfile: The file where the output is written.
"""
assert settings['ASM_JS'], 'fastcomp is asm.js-only (mode 1 or 2)'
success = False
try:
# Overview:
# * Run LLVM backend to emit JS. JS includes function bodies, memory initializer,
# and various metadata
# * Run compiler.js on the metadata to emit the shell js code, pre/post-ambles,
# JS library dependencies, etc.
temp_js = temp_files.get('.4.js').name
backend_compiler = os.path.join(shared.LLVM_ROOT, 'llc')
backend_args = [backend_compiler, infile, '-march=js', '-filetype=asm', '-o', temp_js]
if settings['PRECISE_F32']:
backend_args += ['-emscripten-precise-f32']
if settings['WARN_UNALIGNED']:
backend_args += ['-emscripten-warn-unaligned']
if settings['RESERVED_FUNCTION_POINTERS'] > 0:
backend_args += ['-emscripten-reserved-function-pointers=%d' % settings['RESERVED_FUNCTION_POINTERS']]
if settings['ASSERTIONS'] > 0:
backend_args += ['-emscripten-assertions=%d' % settings['ASSERTIONS']]
if settings['ALIASING_FUNCTION_POINTERS'] == 0:
backend_args += ['-emscripten-no-aliasing-function-pointers']
if settings['GLOBAL_BASE'] >= 0:
backend_args += ['-emscripten-global-base=%d' % settings['GLOBAL_BASE']]
backend_args += ['-O' + str(settings['OPT_LEVEL'])]
if DEBUG:
logging.debug('emscript: llvm backend: ' + ' '.join(backend_args))
t = time.time()
shared.jsrun.timeout_run(subprocess.Popen(backend_args, stdout=subprocess.PIPE))
if DEBUG:
logging.debug(' emscript: llvm backend took %s seconds' % (time.time() - t))
t = time.time()
# Split up output
backend_output = open(temp_js).read()
#if DEBUG: print >> sys.stderr, backend_output
start_funcs_marker = '// EMSCRIPTEN_START_FUNCTIONS'
end_funcs_marker = '// EMSCRIPTEN_END_FUNCTIONS'
metadata_split_marker = '// EMSCRIPTEN_METADATA'
start_funcs = backend_output.index(start_funcs_marker)
end_funcs = backend_output.rindex(end_funcs_marker)
metadata_split = backend_output.rindex(metadata_split_marker)
funcs = backend_output[start_funcs+len(start_funcs_marker):end_funcs]
metadata_raw = backend_output[metadata_split+len(metadata_split_marker):]
#if DEBUG: print >> sys.stderr, "METAraw", metadata_raw
metadata = json.loads(metadata_raw)
mem_init = backend_output[end_funcs+len(end_funcs_marker):metadata_split]
#if DEBUG: print >> sys.stderr, "FUNCS", funcs
#if DEBUG: print >> sys.stderr, "META", metadata
#if DEBUG: print >> sys.stderr, "meminit", mem_init
# if emulating pointer casts, force all tables to the size of the largest
if settings['EMULATE_FUNCTION_POINTER_CASTS']:
max_size = 0
for k, v in metadata['tables'].iteritems():
max_size = max(max_size, v.count(',')+1)
for k, v in metadata['tables'].iteritems():
curr = v.count(',')+1
if curr < max_size:
metadata['tables'][k] = v.replace(']', (',0'*(max_size - curr)) + ']')
# function table masks
table_sizes = {}
for k, v in metadata['tables'].iteritems():
table_sizes[k] = str(v.count(',')) # undercounts by one, but that is what we want
#if settings['ASSERTIONS'] >= 2 and table_sizes[k] == 0:
# print >> sys.stderr, 'warning: no function pointers with signature ' + k + ', but there is a call, which will abort if it occurs (this can result from undefined behavior, check for compiler warnings on your source files and consider -Werror)'
funcs = re.sub(r"#FM_(\w+)#", lambda m: table_sizes[m.groups(0)[0]], funcs)
# fix +float into float.0, if not running js opts
if not settings['RUNNING_JS_OPTS']:
def fix_dot_zero(m):
num = m.group(3)
# TODO: handle 0x floats?
if num.find('.') < 0:
e = num.find('e');
if e < 0:
num += '.0'
else:
num = num[:e] + '.0' + num[e:]
return m.group(1) + m.group(2) + num
funcs = re.sub(r'([(=,+\-*/%<>:?] *)\+(-?)((0x)?[0-9a-f]*\.?[0-9]+([eE][-+]?[0-9]+)?)', lambda m: fix_dot_zero(m), funcs)
# js compiler
if DEBUG: logging.debug('emscript: js compiler glue')
# Settings changes
assert settings['TARGET_ASMJS_UNKNOWN_EMSCRIPTEN'] == 1
settings['TARGET_ASMJS_UNKNOWN_EMSCRIPTEN'] = 2
i64_funcs = ['i64Add', 'i64Subtract', '__muldi3', '__divdi3', '__udivdi3', '__remdi3', '__uremdi3']
for i64_func in i64_funcs:
if i64_func in metadata['declares']:
settings['PRECISE_I64_MATH'] = 2
break
metadata['declares'] = filter(lambda i64_func: i64_func not in ['getHigh32', 'setHigh32', '__muldi3', '__divdi3', '__remdi3', '__udivdi3', '__uremdi3'], metadata['declares']) # FIXME: do these one by one as normal js lib funcs
# Integrate info from backend
settings['DEFAULT_LIBRARY_FUNCS_TO_INCLUDE'] = list(
set(settings['DEFAULT_LIBRARY_FUNCS_TO_INCLUDE'] + map(shared.JS.to_nice_ident, metadata['declares'])).difference(
map(lambda x: x[1:], metadata['implementedFunctions'])
)
) + map(lambda x: x[1:], metadata['externs'])
if metadata['simd']:
settings['SIMD'] = 1
if metadata['cantValidate'] and settings['ASM_JS'] != 2:
logging.warning('disabling asm.js validation due to use of non-supported features: ' + metadata['cantValidate'])
settings['ASM_JS'] = 2
# Save settings to a file to work around v8 issue 1579
settings_file = temp_files.get('.txt').name
def save_settings():
global settings_text
settings_text = json.dumps(settings, sort_keys=True)
s = open(settings_file, 'w')
s.write(settings_text)
s.close()
save_settings()
# Call js compiler
if DEBUG: t = time.time()
out = jsrun.run_js(path_from_root('src', 'compiler.js'), compiler_engine,
[settings_file, ';', 'glue'] + libraries, stdout=subprocess.PIPE, stderr=STDERR_FILE,
cwd=path_from_root('src'), error_limit=300)
assert '//FORWARDED_DATA:' in out, 'Did not receive forwarded data in pre output - process failed?'
glue, forwarded_data = out.split('//FORWARDED_DATA:')
if DEBUG:
logging.debug(' emscript: glue took %s seconds' % (time.time() - t))
t = time.time()
last_forwarded_json = forwarded_json = json.loads(forwarded_data)
# merge in information from llvm backend
last_forwarded_json['Functions']['tables'] = metadata['tables']
'''indexed_functions = set()
for key in forwarded_json['Functions']['indexedFunctions'].iterkeys():
indexed_functions.add(key)'''
pre, post = glue.split('// EMSCRIPTEN_END_FUNCS')
#print >> sys.stderr, 'glue:', pre, '\n\n||||||||||||||||\n\n', post, '...............'
# memory and global initializers
global_initializers = ', '.join(map(lambda i: '{ func: function() { %s() } }' % i, metadata['initializers']))
if settings['SIMD'] == 1:
pre = open(path_from_root(os.path.join('src', 'ecmascript_simd.js'))).read() + '\n\n' + pre
staticbump = mem_init.count(',')+1
while staticbump % 16 != 0: staticbump += 1
pre = pre.replace('STATICTOP = STATIC_BASE + 0;', '''STATICTOP = STATIC_BASE + %d;
/* global initializers */ __ATINIT__.push(%s);
%s''' % (staticbump, global_initializers, mem_init)) # XXX wrong size calculation!
funcs_js = [funcs]
parts = pre.split('// ASM_LIBRARY FUNCTIONS\n')
if len(parts) > 1:
pre = parts[0]
funcs_js.append(parts[1])
# merge forwarded data
settings['EXPORTED_FUNCTIONS'] = forwarded_json['EXPORTED_FUNCTIONS']
all_exported_functions = set(settings['EXPORTED_FUNCTIONS']) # both asm.js and otherwise
for additional_export in settings['DEFAULT_LIBRARY_FUNCS_TO_INCLUDE']: # additional functions to export from asm, if they are implemented
all_exported_functions.add('_' + additional_export)
if settings['EXPORT_FUNCTION_TABLES']:
for table in last_forwarded_json['Functions']['tables'].values():
for func in table.split('[')[1].split(']')[0].split(','):
if func[0] == '_':
all_exported_functions.add(func)
exported_implemented_functions = set(metadata['exports'])
export_bindings = settings['EXPORT_BINDINGS']
export_all = settings['EXPORT_ALL']
all_implemented = metadata['implementedFunctions'] + forwarded_json['Functions']['implementedFunctions'].keys() # XXX perf?
for key in all_implemented:
if key in all_exported_functions or export_all or (export_bindings and key.startswith('_emscripten_bind')):
exported_implemented_functions.add(key)
implemented_functions = set(metadata['implementedFunctions'])
if settings['ASSERTIONS'] and settings.get('ORIGINAL_EXPORTED_FUNCTIONS'):
original_exports = settings['ORIGINAL_EXPORTED_FUNCTIONS']
if original_exports[0] == '@': original_exports = json.loads(open(original_exports[1:]).read())
for requested in original_exports:
if requested not in all_implemented and \
requested != '_malloc': # special-case malloc, EXPORTED by default for internal use, but we bake in a trivial allocator and warn at runtime if used in ASSERTIONS
logging.warning('function requested to be exported, but not implemented: "%s"', requested)
# Add named globals
named_globals = '\n'.join(['var %s = %s;' % (k, v) for k, v in metadata['namedGlobals'].iteritems()])
asm_consts = [0]*len(metadata['asmConsts'])
for k, v in metadata['asmConsts'].iteritems():
const = str(v)
if const[0] == '"' and const[-1] == '"':
const = const[1:-1]
const = '{ ' + const + ' }'
i = 0
args = []
while ('$' + str(i)) in const:
args.append('$' + str(i))
i += 1
const = 'function(' + ', '.join(args ) + ') ' + const
asm_consts[int(k)] = const
asm_const_funcs = []
for arity in metadata['asmConstArities']:
forwarded_json['Functions']['libraryFunctions']['_emscripten_asm_const_%d' % arity] = 1
args = ['a%d' % i for i in range(arity)]
all_args = ['code'] + args
asm_const_funcs.append(r'''
function _emscripten_asm_const_%d(%s) {
return Runtime.asmConsts[code](%s) | 0;
}''' % (arity, ', '.join(all_args), ', '.join(args)))
pre = pre.replace('// === Body ===', '// === Body ===\n' + named_globals + '\nRuntime.asmConsts = [' + ', '.join(asm_consts) + '];\n' + '\n'.join(asm_const_funcs) + '\n')
#if DEBUG: outfile.write('// pre\n')
outfile.write(pre)
pre = None
#if DEBUG: outfile.write('// funcs\n')
# when emulating function pointer casts, we need to know what is the target of each pointer
if settings['EMULATE_FUNCTION_POINTER_CASTS']:
function_pointer_targets = {}
for sig, table in last_forwarded_json['Functions']['tables'].iteritems():
start = table.index('[')
end = table.rindex(']')
body = table[start+1:end].split(',')
parsed = map(lambda x: x.strip(), body)
for i in range(len(parsed)):
if parsed[i] != '0':
assert i not in function_pointer_targets
function_pointer_targets[i] = [sig, str(parsed[i])]
# Move preAsms to their right place
def move_preasm(m):
contents = m.groups(0)[0]
outfile.write(contents + '\n')
return ''
if not settings['BOOTSTRAPPING_STRUCT_INFO']:
funcs_js[1] = re.sub(r'/\* PRE_ASM \*/(.*)\n', lambda m: move_preasm(m), funcs_js[1])
class Counter:
i = 0
j = 0
if 'pre' in last_forwarded_json['Functions']['tables']:
pre_tables = last_forwarded_json['Functions']['tables']['pre']
del last_forwarded_json['Functions']['tables']['pre']
else:
pre_tables = ''
def unfloat(s):
return 'd' if s == 'f' else s # lower float to double for ffis
if settings['ASSERTIONS'] >= 2:
debug_tables = {}
def make_params(sig): return ','.join(['p%d' % p for p in range(len(sig)-1)])
def make_coerced_params(sig): return ','.join([shared.JS.make_coercion('p%d', unfloat(sig[p+1]), settings) % p for p in range(len(sig)-1)])
def make_coercions(sig): return ';'.join(['p%d = %s' % (p, shared.JS.make_coercion('p%d' % p, sig[p+1], settings)) for p in range(len(sig)-1)]) + ';'
def make_func(name, code, params, coercions): return 'function %s(%s) { %s %s }' % (name, params, coercions, code)
def make_table(sig, raw):
params = make_params(sig)
coerced_params = make_coerced_params(sig)
coercions = make_coercions(sig)
def make_bad(target=None):
i = Counter.i
Counter.i += 1
if target is None: target = i
name = 'b' + str(i)
if not settings['ASSERTIONS']:
code = 'abort(%s);' % target
else:
code = 'nullFunc_' + sig + '(%d);' % target
if sig[0] != 'v':
code += 'return %s' % shared.JS.make_initializer(sig[0], settings) + ';'
return name, make_func(name, code, params, coercions)
bad, bad_func = make_bad() # the default bad func
if settings['ASSERTIONS'] <= 1:
Counter.pre = [bad_func]
else: