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import os
from scripts.test.shared import WASM_OPT, run_process
from utils import BinaryenTestCase
'''Test that MemoryPacking correctly respects the web limitations by not
generating more than 100K data segments'''
class MemoryPackingTest(BinaryenTestCase):
def test_large_segment(self):
data = '"' + (('A' + ('\\00' * 9)) * 100001) + '"'
module = '''
(module
(memory 256 256)
(data (i32.const 0) %s)
)
''' % data
opts = ['--memory-packing', '--disable-bulk-memory', '--print',
'-o', os.devnull]
p = run_process(WASM_OPT + opts, input=module, check=False,
capture_output=True)
output = [
'(data (i32.const 999970) "A")',
'(data (i32.const 999980) "A")',
'(data (i32.const 999990) "A' + ('\\00' * 9) + 'A")'
]
self.assertEqual(p.returncode, 0)
for line in output:
self.assertIn(line, p.stdout)
def test_large_segment_unmergeable(self):
data = '\n'.join('(data (i32.const %i) "A")' % i for i in range(100001))
module = '(module (memory 256 256) %s)' % data
opts = ['--memory-packing', '--enable-bulk-memory', '--print',
'-o', os.devnull]
p = run_process(WASM_OPT + opts, input=module, check=False,
capture_output=True)
self.assertEqual(p.returncode, 0)
self.assertIn('Some VMs may not accept this binary', p.stderr)
self.assertIn('Run the limit-segments pass to merge segments.', p.stderr)
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