34 lines
1.3 KiB
Python
34 lines
1.3 KiB
Python
from Lib import RiscV
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from Lib.Operands import Temporary, Operand, S
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from Lib.Statement import Instruction
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from Lib.Allocator import Allocator
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from typing import List
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class AllInMemAllocator(Allocator):
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def replace(self, old_instr: Instruction) -> List[Instruction]:
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"""Replace Temporary operands with the corresponding allocated
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memory location."""
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numreg = 1
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before: List[Instruction] = []
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after: List[Instruction] = []
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new_args: List[Operand] = []
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# TODO: compute before,after,args.
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# TODO: iterate over old_args, check which argument
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# TODO: is a temporary (e.g. isinstance(..., Temporary)),
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# TODO: and if so, generate ld/sd accordingly. Replace the
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# TODO: temporary with S[1], S[2] or S[3] physical registers.
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new_instr = old_instr.with_args(new_args)
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return before + [new_instr] + after
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def prepare(self) -> None:
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"""Allocate all temporaries to memory.
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Invariants:
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- Expanded instructions can use s2 and s3
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(to store the values of temporaries before the actual instruction).
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"""
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self._fdata._pool.set_temp_allocation(
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{temp: self._fdata.fresh_offset()
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for temp in self._fdata._pool.get_all_temps()})
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