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#!/usr/bin/python
# This is a helper script to validate a file for asm.js.
# cmdline usage: 'python validate_asmjs.py filename.{html/js}'
# Prints a line starting with 'OK: ' on success, and returns process exit code 0.
# On failure, prints a line starting with 'FAIL: ', and returns a nonzero process exit code.
# python usage: 'validate_asmjs("filename.{html/js}", muteOutput=True/False)'
# Returns True/False depending on whether the file was valid asm.js.
# This script depends on the SpiderMonkey JS engine, which must be present in PATH in order for this script to function.
import subprocess, sys, re, tempfile, os, time
import shared
# Looks up SpiderMonkey engine using the variable SPIDERMONKEY_ENGINE in ~/.emscripten, and if not set up there, via PATH.
def find_spidermonkey_engine():
sm_engine = shared.SPIDERMONKEY_ENGINE if hasattr(shared, 'SPIDERMONKEY_ENGINE') else ['']
if not sm_engine or len(sm_engine[0]) == 0 or not os.path.exists(sm_engine[0]):
sm_engine[0] = shared.Building.which('js')
if sm_engine[0] == None:
return ['js-not-found']
return sm_engine
# Given a .js file, returns True/False depending on if that file is valid asm.js
def validate_asmjs_jsfile(filename, muteOutput):
process = subprocess.Popen(find_spidermonkey_engine() + ['-c', filename], stdout=subprocess.PIPE, stderr=subprocess.PIPE, stdin=subprocess.PIPE)
(stdout, stderr) = process.communicate()
if not muteOutput:
if len(stdout.strip()) > 0:
print stdout.strip()
if len(stderr.strip()) > 0:
# Pretty-print the output not to contain a spurious warning.
stderr = stderr.replace('warning: successfully compiled asm.js', ' successfully compiled asm.js')
print >> sys.stderr, stderr.strip()
if 'successfully compiled asm.js' in stderr:
return True
else:
return False
# This tool takes as input a file built with Emscripten (either .html or .js) and validates it for asm.js.
# Returns True/False denoting whether the file was valid asm.js. In case of a .html file, all <script>content</script> tags are searched,
# and the ones containing a "use asm" section are validated.
def validate_asmjs(filename, muteOutput):
if filename.endswith('.html'):
html = open(filename, 'r').read()
matches = re.findall('''<\w*script\w*.*?>(.*?)<\w*/script\w*>''', html, re.DOTALL | re.MULTILINE)
numAsmJsBlocks = 0
for match in matches:
if '"use asm"' in match:
numAsmJsBlocks = numAsmJsBlocks + 1
tmp_js = tempfile.mkstemp(suffix='.js')
os.write(tmp_js[0], match)
os.close(tmp_js[0])
valid_asmjs = validate_asmjs_jsfile(tmp_js[1], muteOutput)
os.remove(tmp_js[1])
if not valid_asmjs:
return False
if numAsmJsBlocks == 0:
if not muteOutput:
print >> sys.stderr, 'Error: the file does not contain any "use asm" modules.'
return False
else:
return True
else:
return validate_asmjs_jsfile(filename, muteOutput)
def main():
if len(sys.argv) < 2:
print 'Usage: validate_asmjs <filename>'
return 2
if validate_asmjs(sys.argv[1], muteOutput=False):
print "OK: File '" + sys.argv[1] + "' validates as asm.js"
return 0
else:
print "FAIL: File '" + sys.argv[1] + "' is not valid asm.js"
return 1
if __name__ == '__main__':
sys.exit(main())
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