41 lines
1.4 KiB
Python
41 lines
1.4 KiB
Python
"""
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CAP, CodeGeneration, CFG linearization to a list of statements
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"""
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from typing import List, Set
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from Lib.Statement import Statement, AbsoluteJump, ConditionalJump
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from Lib.Terminator import Return, BranchingTerminator
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from Lib.CFG import Block, CFG
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def ordered_blocks_list(cfg: CFG) -> List[Block]:
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"""
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Compute a list of blocks with optimized ordering for linearization.
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"""
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# TODO
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return cfg.get_blocks()
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def linearize(cfg: CFG) -> List[Statement]:
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"""
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Linearize the given control flow graph as a list of instructions.
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"""
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l: List[Statement] = [] # Linearized CFG
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blocks: List[Block] = ordered_blocks_list(cfg) # All blocks of the CFG
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for i, block in enumerate(blocks):
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# 1. Add the label of the block to the linearization
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l.append(block.get_label())
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# 2. Add the body of the block to the linearization
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l.extend(block.get_body())
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# 3. Add the terminator of the block to the linearization
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match block.get_terminator():
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case BranchingTerminator() as j:
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l.append(ConditionalJump(j.cond, j.op1, j.op2, j.label_then))
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l.append(AbsoluteJump(j.label_else))
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case AbsoluteJump() as j:
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if i+1 == len(blocks) or j != blocks[i+1].get_label():
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l.append(AbsoluteJump(j.label))
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case Return():
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l.append(AbsoluteJump(cfg.get_end()))
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return l
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