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Issue #26881: The modulefinder module now supports extended opcode arguments.

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This commit is contained in:
Serhiy Storchaka 2016-05-08 23:44:54 +03:00
commit 3e99fdeed5
4 changed files with 62 additions and 57 deletions
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59
Lib/dis.py
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@ -284,31 +284,17 @@ def _get_instructions_bytes(code, varnames=None, names=None, constants=None,
"""
labels = findlabels(code)
extended_arg = 0
starts_line = None
free = None
# enumerate() is not an option, since we sometimes process
# multiple elements on a single pass through the loop
n = len(code)
i = 0
while i < n:
op = code[i]
offset = i
for offset, op, arg in _unpack_opargs(code):
if linestarts is not None:
starts_line = linestarts.get(i, None)
starts_line = linestarts.get(offset, None)
if starts_line is not None:
starts_line += line_offset
is_jump_target = i in labels
i = i+1
arg = None
is_jump_target = offset in labels
argval = None
argrepr = ''
if op >= HAVE_ARGUMENT:
arg = code[i] + code[i+1]*256 + extended_arg
extended_arg = 0
i = i+2
if op == EXTENDED_ARG:
extended_arg = arg*65536
if arg is not None:
# Set argval to the dereferenced value of the argument when
# availabe, and argrepr to the string representation of argval.
# _disassemble_bytes needs the string repr of the
@ -319,7 +305,7 @@ def _get_instructions_bytes(code, varnames=None, names=None, constants=None,
elif op in hasname:
argval, argrepr = _get_name_info(arg, names)
elif op in hasjrel:
argval = i + arg
argval = offset + 3 + arg
argrepr = "to " + repr(argval)
elif op in haslocal:
argval, argrepr = _get_name_info(arg, varnames)
@ -329,7 +315,7 @@ def _get_instructions_bytes(code, varnames=None, names=None, constants=None,
elif op in hasfree:
argval, argrepr = _get_name_info(arg, cells)
elif op in hasnargs:
argrepr = "%d positional, %d keyword pair" % (code[i-2], code[i-1])
argrepr = "%d positional, %d keyword pair" % (arg%256, arg//256)
yield Instruction(opname[op], op,
arg, argval, argrepr,
offset, starts_line, is_jump_target)
@ -365,6 +351,25 @@ def _disassemble_str(source, *, file=None):
disco = disassemble # XXX For backwards compatibility
def _unpack_opargs(code):
# enumerate() is not an option, since we sometimes process
# multiple elements on a single pass through the loop
extended_arg = 0
n = len(code)
i = 0
while i < n:
op = code[i]
offset = i
i = i+1
arg = None
if op >= HAVE_ARGUMENT:
arg = code[i] + code[i+1]*256 + extended_arg
extended_arg = 0
i = i+2
if op == EXTENDED_ARG:
extended_arg = arg*65536
yield (offset, op, arg)
def findlabels(code):
"""Detect all offsets in a byte code which are jump targets.
@ -372,19 +377,11 @@ def findlabels(code):
"""
labels = []
# enumerate() is not an option, since we sometimes process
# multiple elements on a single pass through the loop
n = len(code)
i = 0
while i < n:
op = code[i]
i = i+1
if op >= HAVE_ARGUMENT:
arg = code[i] + code[i+1]*256
i = i+2
for offset, op, arg in _unpack_opargs(code):
if arg is not None:
label = -1
if op in hasjrel:
label = i+arg
label = offset + 3 + arg
elif op in hasjabs:
label = arg
if label >= 0: