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#!/usr/bin/env python2
'''
Fast static linker for emscripten outputs. Specifically this links asm.js modules.
Usage: emlink.py [main module] [side module] [output name]
Main module should be built with -s MAIN_MODULE=1 (and possibly -s DISABLE_GL_EMULATION=1, if you do not need GL emulation)
Side module should be built with -s SIDE_MODULE=1
Note that the output file can be used as a main module, so you can link multiple
side modules into a main module that way.
Limitations:
* Modules cannot be minified (but can be minified after linking)
* We duplicate code in some cases, like overlapping names in different modules, and function aliases
* We do not handle sharing of global constants across modules, only code (you can make a function to
access a constant, if you need that)
Overall, this linking approach should be fast to perform, but generate less-optimal results than
to link all the bitcode together and build to JS as a single project. Final builds should be
done in that approach, but during development static linking can avoid recompiling your entire
project all the time.
'''
import os, subprocess, sys, re
from tools import shared
from tools import js_optimizer
try:
me, main, side, out = sys.argv[:4]
except:
print >> sys.stderr, 'usage: emlink.py [main module] [side module] [output name]'
sys.exit(1)
print 'Main module:', main
print 'Side module:', side
print 'Output:', out
class AsmModule():
def __init__(self, filename):
self.filename = filename
self.js = open(filename).read()
self.start_asm = self.js.find(js_optimizer.start_asm_marker)
self.start_funcs = self.js.find(js_optimizer.start_funcs_marker)
self.end_funcs = self.js.rfind(js_optimizer.end_funcs_marker)
self.end_asm = self.js.rfind(js_optimizer.end_asm_marker)
# pre
self.pre_js = self.js[:self.start_asm]
# heap initializer
mem_init = re.search(shared.JS.memory_initializer_pattern, self.pre_js)
if mem_init:
self.mem_init_full_js = mem_init.group(0)
self.mem_init_js = mem_init.groups(0)[0][:-2]
self.mem_init_size = self.mem_init_js.count(',') + self.mem_init_js.count('concat') + 1 # XXX add testing for large and small ones
pad = 8 - (self.mem_init_size % 8)
#print >> sys.stderr, 'pad', self.mem_init_size, pad
if pad < 8:
self.mem_init_js += '.concat([' + ','.join(['0']*pad) + '])'
self.mem_init_size += pad
else:
self.mem_init_js = ''
self.mem_init_size = 0
#print >> sys.stderr, self.mem_init_js
# global initializers
global_inits = re.search(shared.JS.global_initializers_pattern, self.pre_js)
if global_inits:
self.global_inits_js = global_inits.group(0)
self.global_inits = map(lambda init: init.split('{')[2][1:].split('(')[0], global_inits.groups(0)[0].split(','))
else:
self.global_inits_js = ''
self.global_inits = []
# imports
self.imports_js = self.js[self.start_asm:self.start_funcs]
self.imports = [m.group(0) for m in js_optimizer.import_sig.finditer(self.imports_js)]
#print 'imports', self.imports
# funcs
self.funcs_js = self.js[self.start_funcs:self.end_funcs]
self.funcs = [m.group(2) for m in js_optimizer.func_sig.finditer(self.funcs_js)]
#print 'funcs', self.funcs
# tables and exports
post_js = self.js[self.end_funcs:self.end_asm]
ret = post_js.find('return')
self.tables_js = post_js[:ret]
self.exports_js = post_js[ret:]
self.exports = set([export.strip() for export in self.exports_js[self.exports_js.find('{')+1:self.exports_js.find('}')].split(',')])
#print >> sys.stderr, self.exports
# post
self.post_js = self.js[self.end_asm:]
self.module_defs = set(re.findall('var [\w\d_$]+ = Module\["[\w\d_$]+"\] = asm\["[\w\d_$]+"\];\n', self.post_js))
def relocate_into(self, main):
# heap initializer
concat = '.concat(' if main.mem_init_js and self.mem_init_js else ''
end = ')' if main.mem_init_js and self.mem_init_js else ''
allocation = main.mem_init_js + concat + self.mem_init_js + end
if allocation:
full_allocation = '/* memory initializer */ allocate(' + allocation + ', "i8", ALLOC_NONE, Runtime.GLOBAL_BASE)'
main.pre_js = re.sub(shared.JS.memory_initializer_pattern if main.mem_init_js else shared.JS.no_memory_initializer_pattern, full_allocation, main.pre_js, count=1)
main.pre_js = re.sub('STATICTOP = STATIC_BASE \+ (\d+);', 'STATICTOP = STATIC_BASE + %d' % (main.mem_init_size + side.mem_init_size), main.pre_js, count=1)
# imports
main_imports = set(main.imports)
new_imports = [imp for imp in self.imports if imp not in main_imports]
main.imports_js += '\n'.join(new_imports)
# Find function name replacements TODO: do not rename duplicate names with duplicate contents, just merge them
main_funcs = set(main.funcs)
replacements = {}
for i in range(len(self.funcs)):
rep = func = self.funcs[i]
while rep in main_funcs:
rep += '_'
replacements[func] = rep
temp = shared.Building.js_optimizer(self.filename, ['asm', 'relocate'], extra_info={
'replacements': replacements,
'fBase': 0,
'hBase': main.mem_init_size
})
#print >> sys.stderr, 'relocated side into', temp
relocated_funcs = AsmModule(temp)
shared.try_delete(temp)
main.extra_funcs_js = relocated_funcs.funcs_js.replace(js_optimizer.start_funcs_marker, '\n')
# global initializers
if self.global_inits:
my_global_inits = map(lambda init: replacements[init] if init in replacements else init, self.global_inits)
all_global_inits = map(lambda init: '{ func: function() { %s() } }' % init, main.global_inits + my_global_inits)
all_global_inits_js = '/* global initializers */ __ATINIT__.push(' + ','.join(all_global_inits) + ');'
if main.global_inits:
target = main.global_inits_js
else:
target = '// === Body ===\n'
all_global_inits_js = target + all_global_inits_js
main.pre_js = main.pre_js.replace(target, all_global_inits_js)
# tables TODO
# exports
def rep_exp(export):
key, value = export.split(':')
if key in replacements:
repped = replacements[key]
return repped + ': ' + repped
return export
my_exports = map(rep_exp, self.exports)
exports = main.exports.union(my_exports)
main.exports_js = 'return {' + ','.join(list(exports)) + '};\n})\n'
# post
def rep_def(deff):
key = deff.split(' ')[1]
if key in replacements:
rep = replacements[key]
return 'var %s = Module["%s"] = asm["%s"];\n' % (rep, rep, rep)
return deff
my_module_defs = map(rep_def, self.module_defs)
new_module_defs = set(my_module_defs).difference(main.module_defs)
if len(new_module_defs) > 0:
position = main.post_js.find('Runtime.') # Runtime is the start of the hardcoded ones
main.post_js = main.post_js[:position] + ''.join(list(new_module_defs)) + '\n' + main.post_js[position:]
def write(self, out):
f = open(out, 'w')
f.write(self.pre_js)
f.write(self.imports_js)
f.write(self.funcs_js)
f.write(self.extra_funcs_js)
f.write(self.tables_js)
f.write(self.exports_js)
f.write(self.post_js)
f.close()
main = AsmModule(main)
side = AsmModule(side)
side.relocate_into(main)
main.write(out)
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