emscripten/emscripten.py

518 строки
21 KiB
Python
Исходник Обычный вид История

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#!/usr/bin/env python
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'''
You should normally never use this! Use emcc instead.
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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).
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'''
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import os, sys, json, optparse, subprocess, re, time, multiprocessing
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if not os.environ.get('EMSCRIPTEN_SUPPRESS_USAGE_WARNING'):
print >> sys.stderr, '''
==============================================================
WARNING: You should normally never use this! Use emcc instead.
==============================================================
'''
from tools import shared
DEBUG = os.environ.get('EMCC_DEBUG')
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__rootpath__ = os.path.abspath(os.path.dirname(__file__))
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def path_from_root(*pathelems):
"""Returns the absolute path for which the given path elements are
relative to the emscripten root.
"""
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return os.path.join(__rootpath__, *pathelems)
temp_files = shared.TempFiles()
compiler_engine = None
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jcache = False
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 = 5
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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
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def process_funcs(args):
i, funcs, meta, settings_file, compiler, forwarded_file, libraries = args
ll = ''.join(funcs) + '\n' + meta
funcs_file = temp_files.get('.func_%d.ll' % i).name
open(funcs_file, 'w').write(ll)
out = shared.run_js(compiler, compiler_engine, [settings_file, funcs_file, 'funcs', forwarded_file] + libraries, stdout=subprocess.PIPE, cwd=path_from_root('src'))
shared.try_delete(funcs_file)
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return out
def emscript(infile, settings, outfile, libraries=[]):
"""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')
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# 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.
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if DEBUG: print >> sys.stderr, 'emscript: ll=>js'
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if jcache: shared.JCache.ensure()
# Pre-scan ll and alter settings as necessary
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if DEBUG: t = time.time()
ll = open(infile).read()
scan(ll, settings)
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total_ll_size = len(ll)
ll = None # allow collection
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if DEBUG: print >> sys.stderr, ' emscript: scan took %s seconds' % (time.time() - t)
# Split input into the relevant parts for each phase
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pre = []
funcs = [] # split up functions here, for parallelism later
func_idents = []
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meta = [] # needed by each function XXX
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if DEBUG: t = time.time()
in_func = False
ll_lines = open(infile).readlines()
for line in ll_lines:
if in_func:
funcs[-1][1].append(line)
if line.startswith('}'):
in_func = False
funcs[-1] = (funcs[-1][0], ''.join(funcs[-1][1]))
pre.append(line) # pre needs it to, so we know about all implemented functions
else:
if line.startswith(';'): continue
if line.startswith('define '):
in_func = True
funcs.append((line, [line])) # use the entire line as the identifier
pre.append(line) # pre needs it to, so we know about all implemented functions
elif line.find(' = type { ') > 0:
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pre.append(line) # type
elif line.startswith('!'):
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meta.append(line) # metadata
else:
pre.append(line) # pre needs it so we know about globals in pre and funcs. So emit globals there
ll_lines = None
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meta = ''.join(meta)
if DEBUG and len(meta) > 1024*1024: print >> sys.stderr, 'emscript warning: large amounts of metadata, will slow things down'
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if DEBUG: print >> sys.stderr, ' emscript: split took %s seconds' % (time.time() - t)
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#if DEBUG:
# print >> sys.stderr, '========= pre ================\n'
# print >> sys.stderr, ''.join(pre)
# print >> sys.stderr, '========== funcs ===============\n'
# for func in funcs:
# print >> sys.stderr, '\n// ===\n\n', ''.join(func)
# print >> sys.stderr, '=========================\n'
# Save settings to a file to work around v8 issue 1579
settings_file = temp_files.get('.txt').name
def save_settings():
settings_text = json.dumps(settings)
s = open(settings_file, 'w')
s.write(settings_text)
s.close()
save_settings()
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# Phase 1 - pre
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if DEBUG: t = time.time()
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pre_file = temp_files.get('.pre.ll').name
pre_input = ''.join(pre) + '\n' + meta
out = None
if jcache:
keys = [pre_input, settings_text, ','.join(libraries)]
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shortkey = shared.JCache.get_shortkey(keys)
out = shared.JCache.get(shortkey, keys)
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if out and DEBUG: print >> sys.stderr, ' loading pre from jcache'
if not out:
open(pre_file, 'w').write(pre_input)
out = shared.run_js(compiler, shared.COMPILER_ENGINE, [settings_file, pre_file, 'pre'] + libraries, stdout=subprocess.PIPE, cwd=path_from_root('src'))
if jcache:
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if DEBUG: print >> sys.stderr, ' saving pre to jcache'
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shared.JCache.set(shortkey, keys, out)
pre, forwarded_data = out.split('//FORWARDED_DATA:')
forwarded_file = temp_files.get('.json').name
open(forwarded_file, 'w').write(forwarded_data)
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if DEBUG: print >> sys.stderr, ' emscript: phase 1 took %s seconds' % (time.time() - t)
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# Phase 2 - func
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cores = multiprocessing.cpu_count()
assert cores >= 1
if cores > 1:
intended_num_chunks = 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
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if DEBUG: t = time.time()
forwarded_json = json.loads(forwarded_data)
indexed_functions = set()
if settings.get('ASM_JS'):
settings['EXPORTED_FUNCTIONS'] = forwarded_json['EXPORTED_FUNCTIONS']
save_settings()
chunks = shared.JCache.chunkify(funcs, chunk_size, 'emscript_files' if jcache else None)
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if jcache:
# load chunks from cache where we can # TODO: ignore small chunks
cached_outputs = []
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def load_from_cache(chunk):
keys = [settings_text, forwarded_data, chunk]
shortkey = shared.JCache.get_shortkey(keys) # TODO: share shortkeys with later code
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out = shared.JCache.get(shortkey, keys) # this is relatively expensive (pickling?)
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if out:
cached_outputs.append(out)
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return False
return True
chunks = filter(load_from_cache, chunks)
if len(cached_outputs) > 0:
if out and DEBUG: print >> sys.stderr, ' loading %d funcchunks from jcache' % len(cached_outputs)
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else:
cached_outputs = []
# TODO: minimize size of forwarded data from funcs to what we actually need
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if cores == 1 and total_ll_size < MAX_CHUNK_SIZE: assert len(chunks) == 1, 'no point in splitting up without multiple cores'
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if len(chunks) > 0:
if DEBUG: print >> sys.stderr, ' 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 = [(i, chunks[i], meta, settings_file, compiler, forwarded_file, libraries) for i in range(len(chunks))]
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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])]
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else:
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outputs = []
if jcache:
# save chunks to cache
for i in range(len(chunks)):
chunk = chunks[i]
keys = [settings_text, forwarded_data, chunk]
shortkey = shared.JCache.get_shortkey(keys)
shared.JCache.set(shortkey, keys, outputs[i])
if out and DEBUG and len(chunks) > 0: print >> sys.stderr, ' saving %d funcchunks to jcache' % len(chunks)
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if jcache: outputs += cached_outputs # TODO: preserve order
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outputs = [output.split('//FORWARDED_DATA:') for output in outputs]
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if DEBUG: print >> sys.stderr, ' 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
exported_implemented_functions = set()
for func_js, curr_forwarded_data in outputs:
curr_forwarded_json = json.loads(curr_forwarded_data)
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'):
for key in curr_forwarded_json['Functions']['implementedFunctions'].iterkeys():
if key in all_exported_functions: exported_implemented_functions.add(key)
for key, value in curr_forwarded_json['Functions']['unimplementedFunctions'].iteritems():
forwarded_json['Functions']['unimplementedFunctions'][key] = value
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funcs_js = ''.join([output[0] for output in outputs])
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outputs = None
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if DEBUG: print >> sys.stderr, ' emscript: phase 2b took %s seconds' % (time.time() - t)
if DEBUG: t = time.time()
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# calculations on merged forwarded data
forwarded_json['Functions']['indexedFunctions'] = {}
i = 2
for indexed in indexed_functions:
forwarded_json['Functions']['indexedFunctions'][indexed] = i # make sure not to modify this python object later - we use it in indexize
i += 2
forwarded_json['Functions']['nextIndex'] = i
indexing = forwarded_json['Functions']['indexedFunctions']
def indexize(js):
return re.sub(r'{{{ FI_([\w\d_$]+) }}}', lambda m: str(indexing[m.groups(0)[0]]), js)
blockaddrs = forwarded_json['Functions']['blockAddresses']
def blockaddrsize(js):
return re.sub(r'{{{ BA_([\w\d_$]+)\|([\w\d_$]+) }}}', lambda m: str(blockaddrs[m.groups(0)[0]][m.groups(0)[1]]), js)
if settings.get('ASM_JS'):
outfile.write('(function() {\n'); # prevent new Function from seeing the global scope
#if DEBUG: outfile.write('// pre\n')
outfile.write(blockaddrsize(indexize(pre)))
pre = None
#if DEBUG: outfile.write('// funcs\n')
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# forward
forwarded_data = json.dumps(forwarded_json)
forwarded_file = temp_files.get('.2.json').name
open(forwarded_file, 'w').write(indexize(forwarded_data))
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if DEBUG: print >> sys.stderr, ' emscript: phase 2c took %s seconds' % (time.time() - t)
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# Phase 3 - post
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if DEBUG: t = time.time()
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post_file = temp_files.get('.post.ll').name
open(post_file, 'w').write('\n') # no input, just processing of forwarded data
out = shared.run_js(compiler, shared.COMPILER_ENGINE, [settings_file, post_file, 'post', forwarded_file] + libraries, stdout=subprocess.PIPE, cwd=path_from_root('src'))
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post, last_forwarded_data = out.split('//FORWARDED_DATA:')
last_forwarded_json = json.loads(last_forwarded_data)
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function_tables_defs = '\n'.join([table for table in last_forwarded_json['Functions']['tables'].itervalues()])
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if settings.get('ASM_JS'):
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asm_setup = ''
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fundamentals = ['buffer', 'Int8Array', 'Int16Array', 'Int32Array', 'Uint8Array', 'Uint16Array', 'Uint32Array', 'Float32Array', 'Float64Array']
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basics = ['abort', 'assert', 'STACKTOP', 'STACK_MAX', 'tempDoublePtr', 'ABORT']
if not settings['NAMED_GLOBALS']: basics += ['GLOBAL_BASE']
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if forwarded_json['Types']['preciseI64MathUsed']:
basics += ['i64Math_' + op for op in ['add', 'subtract', 'multiply', 'divide', 'modulo']]
asm_setup += '''
var i64Math_add = function(a, b, c, d) { i64Math.add(a, b, c, d) };
var i64Math_subtract = function(a, b, c, d) { i64Math.subtract(a, b, c, d) };
var i64Math_multiply = function(a, b, c, d) { i64Math.multiply(a, b, c, d) };
var i64Math_divide = function(a, b, c, d) { i64Math.divide(a, b, c, d) };
var i64Math_modulo = function(a, b, c, d) { i64Math.modulo(a, b, c, d) };
'''
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asm_runtime_funcs = ['stackAlloc', 'stackSave', 'stackRestore']
# 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) + '=' + ('+' if sig[i] == 'd' else '') + 'a' + str(i) + ('|0' if sig[i] == 'i' else '') + ';' for i in range(1, len(sig))])
function_tables_impls.append('''
function dynCall_%s(index%s%s) {
%s
%sFUNCTION_TABLE_%s[index](%s);
}
''' % (sig, ',' if len(sig) > 1 else '', args, arg_coercions, 'return ' if sig[0] != 'v' else '', sig, args))
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# calculate exports
exported_implemented_functions = list(exported_implemented_functions)
exports = []
for export in exported_implemented_functions + asm_runtime_funcs + function_tables:
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exports.append("'%s': %s" % (export, export))
exports = '{ ' + ', '.join(exports) + ' }'
# calculate globals
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try:
del forwarded_json['Variables']['globals']['_llvm_global_ctors'] # not a true variable
except:
pass
global_vars = forwarded_json['Variables']['globals'].keys() if settings['NAMED_GLOBALS'] else []
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global_funcs = ['_' + x for x in forwarded_json['Functions']['libraryFunctions'].keys()]
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asm_globals = ''.join([' var ' + g + '=env.' + g + ';\n' for g in basics + global_funcs + global_vars])
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# sent data
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sending = '{ ' + ', '.join([s + ': ' + s for s in fundamentals + basics + global_funcs + global_vars]) + ' }'
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# received
receiving = ';\n'.join(['var ' + s + ' = Module["' + s + '"] = asm.' + s for s in exported_implemented_functions + function_tables])
# finalize
funcs_js = '''
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%s
var asmPre = (function(env, buffer) {
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'use asm';
var HEAP8 = new env.Int8Array(buffer);
var HEAP16 = new env.Int16Array(buffer);
var HEAP32 = new env.Int32Array(buffer);
var HEAPU8 = new env.Uint8Array(buffer);
var HEAPU16 = new env.Uint16Array(buffer);
var HEAPU32 = new env.Uint32Array(buffer);
var HEAPF32 = new env.Float32Array(buffer);
var HEAPF64 = new env.Float64Array(buffer);
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''' % (asm_setup,) + asm_globals + '''
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function stackAlloc(size) {
var ret = STACKTOP;
STACKTOP = (STACKTOP + size)|0;
STACKTOP = ((STACKTOP + 3)>>2)<<2;
return ret;
}
function stackSave() {
return STACKTOP;
}
function stackRestore(top) {
top = top|0;
STACKTOP = top;
}
''' + funcs_js.replace('\n', '\n ') + '''
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%s
return %s;
});
if (asmPre.toSource) { // works in sm but not v8, so we get full coverage between those two
asmPre = asmPre.toSource();
asmPre = asmPre.substr(25, asmPre.length-28);
asmPre = new Function('env', 'buffer', asmPre);
}
var asm = asmPre(%s, buffer); // pass through Function to prevent seeing outside scope
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%s;
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Runtime.stackAlloc = function(size) { return asm.stackAlloc(size) };
Runtime.stackSave = function() { return asm.stackSave() };
Runtime.stackRestore = function(top) { asm.stackRestore(top) };
''' % (function_tables_defs.replace('\n', '\n ') + '\n' + '\n'.join(function_tables_impls), exports, sending, receiving)
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else:
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outfile.write(function_tables_defs)
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outfile.write(blockaddrsize(indexize(funcs_js)))
funcs_js = None
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outfile.write(indexize(post))
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if DEBUG: print >> sys.stderr, ' emscript: phase 3 took %s seconds' % (time.time() - t)
if settings.get('ASM_JS'):
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outfile.write('}).apply(null, arguments);\n');
outfile.close()
def main(args):
# Prepare settings for serialization to JSON.
settings = {}
for setting in args.settings:
name, value = setting.strip().split('=', 1)
settings[name] = json.loads(value)
# Add header defines to settings
defines = {}
include_root = path_from_root('system', 'include')
headers = args.headers[0].split(',') if len(args.headers) > 0 else []
seen_headers = set()
while len(headers) > 0:
header = headers.pop(0)
if not os.path.isabs(header):
header = os.path.join(include_root, header)
seen_headers.add(header)
for line in open(header, 'r'):
line = line.replace('\t', ' ')
m = re.match('^ *# *define +(?P<name>[-\w_.]+) +\(?(?P<value>[-\w_.|]+)\)?.*', line)
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if not m:
# Catch enum defines of a very limited sort
m = re.match('^ +(?P<name>[A-Z_\d]+) += +(?P<value>\d+).*', line)
if m:
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if m.group('name') != m.group('value'):
defines[m.group('name')] = m.group('value')
#else:
# print 'Warning: %s #defined to itself' % m.group('name') # XXX this can happen if we are set to be equal to an enum (with the same name)
m = re.match('^ *# *include *["<](?P<name>[\w_.-/]+)[">].*', line)
if m:
# Find this file
found = False
for w in [w for w in os.walk(include_root)]:
for f in w[2]:
curr = os.path.join(w[0], f)
if curr.endswith(m.group('name')) and curr not in seen_headers:
headers.append(curr)
found = True
break
if found: break
#assert found, 'Could not find header: ' + m.group('name')
if len(defines) > 0:
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def lookup(value):
try:
while not unicode(value).isnumeric():
value = defines[value]
return value
except:
pass
try: # 0x300 etc.
value = eval(value)
return value
except:
pass
try: # CONST1|CONST2
parts = map(lookup, value.split('|'))
value = reduce(lambda a, b: a|b, map(eval, parts))
return value
except:
pass
return None
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for key, value in defines.items():
value = lookup(value)
if value is not None:
defines[key] = str(value)
else:
del defines[key]
#print >> sys.stderr, 'new defs:', str(defines).replace(',', ',\n '), '\n\n'
settings.setdefault('C_DEFINES', {}).update(defines)
# libraries
libraries = args.libraries[0].split(',') if len(args.libraries) > 0 else []
# Compile the assembly to Javascript.
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if settings.get('RELOOP'): shared.Building.ensure_relooper()
emscript(args.infile, settings, args.outfile, libraries)
if __name__ == '__main__':
parser = optparse.OptionParser(
usage='usage: %prog [-h] [-H HEADERS] [-o OUTFILE] [-c COMPILER_ENGINE] [-s FOO=BAR]* infile',
description=('You should normally never use this! Use emcc instead. '
'This is a wrapper around the JS compiler, converting .ll to .js.'),
epilog='')
parser.add_option('-H', '--headers',
default=[],
action='append',
help='System headers (comma separated) whose #defines should be exposed to the compiled code.')
parser.add_option('-L', '--libraries',
default=[],
action='append',
help='Library files (comma separated) to use in addition to those in emscripten src/library_*.')
parser.add_option('-o', '--outfile',
default=sys.stdout,
help='Where to write the output; defaults to stdout.')
parser.add_option('-c', '--compiler',
default=shared.COMPILER_ENGINE,
help='Which JS engine to use to run the compiler; defaults to the one in ~/.emscripten.')
parser.add_option('-s', '--setting',
dest='settings',
default=[],
action='append',
metavar='FOO=BAR',
help=('Overrides for settings defined in settings.js. '
'May occur multiple times.'))
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parser.add_option('-j', '--jcache',
action='store_true',
default=False,
help=('Enable jcache (ccache-like caching of compilation results, for faster incremental builds).'))
# Convert to the same format that argparse would have produced.
keywords, positional = parser.parse_args()
if len(positional) != 1:
raise RuntimeError('Must provide exactly one positional argument.')
keywords.infile = os.path.abspath(positional[0])
if isinstance(keywords.outfile, basestring):
keywords.outfile = open(keywords.outfile, 'w')
compiler_engine = keywords.compiler
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jcache = keywords.jcache
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temp_files.run_and_clean(lambda: main(keywords))