143 lines
3.7 KiB
Python
143 lines
3.7 KiB
Python
import logging
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from ScEpTIC import tools
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class Instruction:
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"""
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Generic AST Instruction
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"""
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_vmstate = None
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# number of clock tick to be increased by this instruction
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tick_count = 1
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memory_tick_count = 0
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def __init__(self):
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self.basic_block_id = None
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self.label = None
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self.preds = None
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self.metadata = None
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self._omit_target = False
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self.memory_tag = None
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self.memory_tag_dependency = None
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self.is_part_of_dummy_write = False
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self.is_dummy_write_master = False
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self.dummy_write_master = None
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def __str__(self):
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retstr = ''
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if self.label is not None:
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retstr += '[{}] '.format(self.label)
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if 'target' in self.__dict__ and not self._omit_target and self.target is not None:
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retstr += '{} = '.format(self.target)
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return retstr
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def save_in_target_register(self, value):
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"""
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Saves a given value in the target register of the instruction, if present.
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"""
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if self._omit_target or self.target is None:
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return
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# get target register name
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target = self.target.value
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self._vmstate.register_file.write(target, value)
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if self._vmstate.input_lookup_enabled:
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input_lookup_data = self.get_input_lookup()
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self._vmstate.register_file.set_input_lookup(target, input_lookup_data)
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logging.info('[{}] Saving result in {}'.format(self.instruction_type, target))
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def run(self, update_program_counter=True):
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"""
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Executes the operation and the target assignment.
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"""
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value = self.get_val()
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self.save_in_target_register(value)
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# call run's callback
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self._vmstate.on_run(self.tick_count, update_program_counter)
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def get_defs(self):
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"""
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Returns a list of registers defined by this instruction. Usually its len will be 1 or 0.
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(used by register allocation)
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"""
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if 'target' in self.__dict__.keys() and self.target is not None:
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return self.target.get_uses()
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return []
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def get_uses(self):
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"""
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Returns a list containing the names of the registers used by this instruction.
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(used by register allocation)
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"""
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return []
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def get_ignore(self):
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"""
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Returns a list of register names to be ignored by register allocation.
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"""
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return []
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def get_input_lookup(self):
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"""
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Returns the input lookup data for the current operation
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"""
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return tools.build_input_lookup_data(None, None)
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@property
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def instruction_type(self):
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"""
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Returns the instruction type
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"""
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return self.__class__.__name__
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def replace_reg_name(self, old_reg_name, new_reg_name):
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"""
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Skeleton.
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Replaces the name of a register used by the instruction with a new one.
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(used by register allocation)
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"""
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pass
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def resolve_memory_tag(self, elements):
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"""
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Resolves and returns the memory tag of the targeted element
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"""
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raise NotImplementedError(f"{self.__class__.__name__} does not implement resolve_memory_tag()")
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def resolve_memory_address_chain(self, elements):
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"""
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Returns a list of all the instructions required to get the address of the targeted element(s)
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"""
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raise NotImplementedError(f"{self.__class__.__name__} does not implement resolve_memory_address_chain()")
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