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__init__.py
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141 lines (119 loc) · 4.64 KB
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import sys
import textwrap
import types
import unittest
from bytecode import (UNSET, Label, Instr, ConcreteInstr, BasicBlock, # noqa
Bytecode, ControlFlowGraph, ConcreteBytecode)
WORDCODE = (sys.version_info >= (3, 6))
def _format_instr_list(block, labels, lineno):
instr_list = []
for instr in block:
if not isinstance(instr, Label):
if isinstance(instr, ConcreteInstr):
cls_name = 'ConcreteInstr'
else:
cls_name = 'Instr'
arg = instr.arg
if arg is not UNSET:
if isinstance(arg, Label):
arg = labels[arg]
elif isinstance(arg, BasicBlock):
arg = labels[id(arg)]
else:
arg = repr(arg)
if lineno:
text = '%s(%r, %s, lineno=%s)' % (
cls_name, instr.name, arg, instr.lineno)
else:
text = '%s(%r, %s)' % (cls_name, instr.name, arg)
else:
if lineno:
text = '%s(%r, lineno=%s)' % (
cls_name, instr.name, instr.lineno)
else:
text = '%s(%r)' % (cls_name, instr.name)
else:
text = labels[instr]
instr_list.append(text)
return '[%s]' % ',\n '.join(instr_list)
def dump_bytecode(code, lineno=False):
"""
Use this function to write unit tests: copy/paste its output to
write a self.assertBlocksEqual() check.
"""
print()
if isinstance(code, (Bytecode, ConcreteBytecode)):
is_concrete = isinstance(code, ConcreteBytecode)
if is_concrete:
block = list(code)
else:
block = code
indent = ' ' * 8
labels = {}
for index, instr in enumerate(block):
if isinstance(instr, Label):
name = 'label_instr%s' % index
labels[instr] = name
if is_concrete:
name = 'ConcreteBytecode'
print(indent + 'code = %s()' % name)
if code.argcount:
print(indent + 'code.argcount = %s' % code.argcount)
if code.kwonlyargcount:
print(indent + 'code.argcount = %s' % code.kwonlyargcount)
print(indent + 'code.flags = %#x' % code.flags)
if code.consts:
print(indent + 'code.consts = %r' % code.consts)
if code.names:
print(indent + 'code.names = %r' % code.names)
if code.varnames:
print(indent + 'code.varnames = %r' % code.varnames)
for name in sorted(labels.values()):
print(indent + '%s = Label()' % name)
if is_concrete:
text = indent + 'code.extend('
indent = ' ' * len(text)
else:
text = indent + 'code = Bytecode('
indent = ' ' * len(text)
lines = _format_instr_list(code, labels, lineno).splitlines()
last_line = len(lines) - 1
for index, line in enumerate(lines):
if index == 0:
print(text + lines[0])
elif index == last_line:
print(indent + line + ')')
else:
print(indent + line)
print()
else:
assert isinstance(code, ControlFlowGraph)
labels = {}
for block_index, block in enumerate(code):
labels[id(block)] = 'code[%s]' % block_index
for block_index, block in enumerate(code):
text = _format_instr_list(block, labels, lineno)
if block_index != len(code) - 1:
text += ','
print(text)
print()
def get_code(source, *, filename="<string>", function=False):
source = textwrap.dedent(source).strip()
code = compile(source, filename, "exec")
if function:
sub_code = [const for const in code.co_consts
if isinstance(const, types.CodeType)]
if len(sub_code) != 1:
raise ValueError("unable to find function code")
code = sub_code[0]
return code
def disassemble(source, *, filename="<string>", function=False):
code = get_code(source, filename=filename, function=function)
return Bytecode.from_code(code)
class TestCase(unittest.TestCase):
def assertBlocksEqual(self, code, *expected_blocks):
self.assertEqual(len(code), len(expected_blocks))
for block1, block2 in zip(code, expected_blocks):
block_index = code.get_block_index(block1)
self.assertListEqual(list(block1), block2,
"Block #%s is different" % block_index)