String literal limited to 64Kb

[donkirkby]

This is probably abuse of string literals, but the following code works in cPython:

def generate_code():
    print('big_string = """\\')
    for i in range(65536//64):
        s = (str(i)+'_') * 32
        print(s[:63])
    print('"""')

big_string = """\
0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0
1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1
[Trimmed for sanity. Run generate_code() to generate 64Kb string.]
1022_1022_1022_1022_1022_1022_1022_1022_1022_1022_1022_1022_102
1023_1023_1023_1023_1023_1023_1023_1023_1023_1023_1023_1023_102
"""

print('String size:', len(big_string))
# generate_code()

When I run that in cPython, I see the size of the string:

$ python take_test.py 
String size: 65536

When I run it in voc, I get an error:

$ voc -v take_test.py && java -classpath ../voc/dist/python-java-support.jar:. python.take_test
Compiling take_test.py ...
Writing ./python/take_test.class ...
Traceback (most recent call last):
  File "/home/don/.local/share/virtualenvs/voc-tutorial-YXlPRKgA/bin/voc", line 11, in <module>
    load_entry_point('voc', 'console_scripts', 'voc')()
  File "/home/don/git/voc-tutorial/voc/voc/__main__.py", line 52, in main
    verbosity=args.verbosity
  File "/home/don/git/voc-tutorial/voc/voc/transpiler.py", line 33, in transpile
    transpiler.write(outdir)
  File "/home/don/git/voc-tutorial/voc/voc/transpiler.py", line 62, in write
    javaclassfile.write(out)
  File "/home/don/git/voc-tutorial/voc/voc/java/klass.py", line 422, in write
    constant_pool.write(writer)
  File "/home/don/git/voc-tutorial/voc/voc/java/constants.py", line 151, in write
    constant.write(writer)
  File "/home/don/git/voc-tutorial/voc/voc/java/constants.py", line 211, in write
    self.write_info(writer)
  File "/home/don/git/voc-tutorial/voc/voc/java/constants.py", line 981, in write_info
    writer.write_u2(self.length)
  File "/home/don/git/voc-tutorial/voc/voc/java/klass.py", line 73, in write_u2
    self._outfile.write(struct.pack('>H', u2))
struct.error: 'H' format requires 0 <= number <= 65535

I can work around it by adding two smaller strings together, like this:

big_string = """\
0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0_0
1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1_1
[Trimmed for sanity. Run generate_code() to generate 64Kb string.]
1022_1022_1022_1022_1022_1022_1022_1022_1022_1022_1022_1022_102
1023_1023_1023_1023_1023_1023_1023_1023_1023_1023_1023_1023_10
""" + "2"

print('String size:', len(big_string))

I'm running this with voc 0.1.5, Python 3.5.2, and Ubuntu 16.04.