pyassem.py 文件源码

def flattenGraph(self):
        """Arrange the blocks in order and resolve jumps"""
        assert self.stage == RAW
        self.insts = insts = []
        pc = 0
        begin = {}
        end = {}
        for b in self.getBlocksInOrder():
            begin[b] = pc
            for inst in b.getInstructions():
                insts.append(inst)
                if len(inst) == 1:
                    pc = pc + 1
                elif inst[0] != "SET_LINENO":
                    # arg takes 2 bytes
                    pc = pc + 3
            end[b] = pc
        pc = 0
        for i in range(len(insts)):
            inst = insts[i]
            if len(inst) == 1:
                pc = pc + 1
            elif inst[0] != "SET_LINENO":
                pc = pc + 3
            opname = inst[0]
            if opname in self.hasjrel:
                oparg = inst[1]
                offset = begin[oparg] - pc
                insts[i] = opname, offset
            elif opname in self.hasjabs:
                insts[i] = opname, begin[inst[1]]
        self.stage = FLAT