1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
|
#!/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.tables = self.parse_tables(self.tables_js)
self.exports = set([export.strip() for export in self.exports_js[self.exports_js.find('{')+1:self.exports_js.find('}')].split(',')])
# 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
#print >> sys.stderr, 'replacements:', replacements
# tables
f_bases = {}
for table, data in self.tables.iteritems():
main.tables[table] = self.merge_tables(table, main.tables.get(table), data, replacements, f_bases)
main.combine_tables()
temp = shared.Building.js_optimizer(self.filename, ['asm', 'relocate'], extra_info={
'replacements': replacements,
'fBases': f_bases,
'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)
# 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()
# Utilities
def parse_tables(self, js):
tables = {}
parts = js.split(';')
for part in parts:
if '=' not in part: continue
part = part.split('var ')[1]
name, data = part.split(' = ')
tables[name] = data
return tables
def merge_tables(self, table, main, side, replacements, f_bases):
side = side[1:-1].split(',')
side = map(lambda f: replacements[f] if f in replacements else f, side)
if not main:
f_bases[table] = 0
return '[' + ','.join(side) + ']'
main = main[1:-1].split(',')
# TODO: handle non-aliasing case too
assert len(main) % 2 == 0
f_bases[table] = len(main)
ret = main + side
size = 2
while size < len(ret): size *= 2
ret = ret + [0]*(size - len(ret))
assert len(ret) == size
return '[' + ','.join(ret) + ']'
def combine_tables(self):
self.tables_js = '// EMSCRIPTEN_END_FUNCS\n'
for table, data in self.tables.iteritems():
self.tables_js += 'var %s = %s;\n' % (table, data)
main = AsmModule(main)
side = AsmModule(side)
side.relocate_into(main)
main.write(out)
|
