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basicblock.py
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basicblock.py
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class BasicBlock:
"""
A basic block is a set of instructions, that has a single entry and single exit.
Execution begins from the top and ends at the bottom. There can be no branching
in between.
"""
def __init__(self):
self.address = 0
self.instructions = []
self.has_xrefs_to = False
# Instructions which xreference this basic block
self.xref_instructions = []
# b_seen is used to perform a DFS of basicblocks
self.b_seen = False
def add_instruction(self, ins):
self.instructions.append(ins)
def instruction_iter(self):
"""
An iterator for traversing over the instructions.
:return: An iterator for iterating over the instruction
"""
for ins in self.instructions:
yield ins
def size(self):
"""
Calculates the size of the basic block
:return:
"""
return reduce(lambda x, ins: x + ins.size, self.instructions, 0)