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Modified BytecodeFlowBuilder and AddressFlowBuilder to use a named tuple for representing bytecode instructions.

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This commit is contained in:
Jon Riehl 2013-06-11 16:44:15 -05:00
commit 68030d51d1
2 changed files with 19 additions and 13 deletions
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22
llpython/byte_flow.py
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@ -6,6 +6,7 @@ import dis
import opcode
import pprint
import inspect
from collections import namedtuple
from .bytecode_visitor import BasicBlockVisitor
from . import opcode_util
@ -14,6 +15,11 @@ from . import byte_control
# ______________________________________________________________________
# Class definition(s)
Instr = namedtuple('Instr', ('address', 'opcode', 'opname', 'oparg',
'stackargs'))
# ______________________________________________________________________
class BytecodeFlowBuilder (BasicBlockVisitor):
'''Transforms a CFG into a bytecode "flow tree".
@ -47,7 +53,7 @@ class BytecodeFlowBuilder (BasicBlockVisitor):
del self.stack[-pops:]
else:
stk_args = []
ret_val = (i, op, opname, arg, stk_args)
ret_val = Instr(i, op, opname, arg, stk_args)
if pushes:
self.stack.append(ret_val)
if appends:
@ -174,7 +180,7 @@ class BytecodeFlowBuilder (BasicBlockVisitor):
# References top of stack without popping, so we can't use the
# generic machinery.
opname = self.opmap[op][0]
ret_val = i, op, opname, arg, [self.stack[-1]]
ret_val = Instr(i, op, opname, arg, [self.stack[-1]])
self.stack.append(ret_val)
return ret_val
@ -197,7 +203,7 @@ class BytecodeFlowBuilder (BasicBlockVisitor):
op_JUMP_FORWARD = _op
def op_JUMP_IF_FALSE (self, i, op, arg):
ret_val = i, op, self.opnames[op], arg, [self.stack[-1]]
ret_val = Instr(i, op, self.opnames[op], arg, [self.stack[-1]])
self.block.append(ret_val)
return ret_val
@ -210,7 +216,7 @@ class BytecodeFlowBuilder (BasicBlockVisitor):
opcodes.'''
elem = self.stack.pop()
container = self.stack[-arg]
ret_val = i, op, self.opnames[op], arg, [container, elem]
ret_val = Instr(i, op, self.opnames[op], arg, [container, elem])
self.block.append(ret_val)
return ret_val
@ -255,7 +261,7 @@ class BytecodeFlowBuilder (BasicBlockVisitor):
def _op_SETUP (self, i, op, arg):
self.control_stack.append((i, op, arg, len(self.stack)))
ret_val = i, op, self.opnames[op], arg, []
ret_val = Instr(i, op, self.opnames[op], arg, [])
self.block.append(ret_val)
return ret_val
@ -269,9 +275,9 @@ class BytecodeFlowBuilder (BasicBlockVisitor):
# the value stack (the exit ), and once on the handler frame.
ctx = self.stack.pop()
# We signal that the value is an exit handler by setting arg to None
exit_handler = i, op, self.opnames[op], None, [ctx]
exit_handler = Instr(i, op, self.opnames[op], None, [ctx])
self.stack.append(exit_handler)
ret_val = i, op, self.opnames[op], arg, [ctx]
ret_val = Instr(i, op, self.opnames[op], arg, [ctx])
self.control_stack.append((i, op, arg, len(self.stack)))
self.stack.append(ret_val)
self.block.append(ret_val)
@ -301,7 +307,7 @@ class BytecodeFlowBuilder (BasicBlockVisitor):
opname = self.opnames[op]
while arg > 0:
arg -= 1
ret_val = i, op, opname, arg, [seq]
ret_val = Instr(i, op, opname, arg, [seq])
self.stack.append(ret_val)
return ret_val