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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.
'''
import os, subprocess, sys
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)
# 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:]
def relocate_into(self, main):
# imports
main_imports = set(main.imports)
new_imports = [imp for imp in self.imports if imp not in main_imports]
print 'new imports', new_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
#print replacements
temp = shared.Building.js_optimizer(self.filename, ['asm', 'relocate'], extra_info={ 'replacements': replacements })
relocated_funcs = AsmModule(temp)
shared.try_delete(temp)
main.extra_funcs_js = relocated_funcs.funcs_js
# tables
# exports
def write(self, out):
f = open(out, 'w')
f.write(self.js[:self.start_asm])
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.js[self.end_asm:])
f.close()
main = AsmModule(main)
side = AsmModule(side)
side.relocate_into(main)
main.write(out)
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