255 lines
8.8 KiB
Python
255 lines
8.8 KiB
Python
from cfg.CFG_Node import (
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CFG_Node,
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CFG_CALL,
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CFG_RETURN,
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CFG_DIAMOND,
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CFG_START,
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CFG_END,
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)
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import compiler
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import syntax
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# Global registry for function start/end nodes
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FUNCTIONS = {}
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class CONST(compiler.CONST):
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def cfa(self, pred, end):
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n = CFG_Node(self)
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pred.add_child(n)
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n.add_child(end) if end else None
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return n
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class ID(compiler.ID):
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def cfa(self, pred, end):
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n = CFG_Node(self)
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pred.add_child(n)
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n.add_child(end) if end else None
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return n
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class AOP(compiler.AOP):
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def cfa(self, pred, end):
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# Create nodes for each operand separately (like the example)
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left_node = self.arg1.cfa(pred, None)
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right_node = self.arg2.cfa(left_node, None)
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# Create the comparison node with just the operator
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op_node = CFG_Node(self)
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op_node.label = f"{self.operator}"
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right_node.add_child(op_node)
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op_node.add_child(end) if end else None
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return op_node
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class COMP(compiler.COMP):
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def cfa(self, pred, end):
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# Create nodes for each operand separately (like the example)
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left_node = self.arg1.cfa(pred, None)
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right_node = self.arg2.cfa(left_node, None)
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# Create the comparison node with just the operator
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comp_node = CFG_Node(self)
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comp_node.label = f"{self.operator}"
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right_node.add_child(comp_node)
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comp_node.add_child(end) if end else None
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return comp_node
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class EQOP(compiler.EQOP):
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def cfa(self, pred, end):
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# Create nodes for each operand separately (like the example)
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left_node = self.arg1.cfa(pred, None)
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right_node = self.arg2.cfa(left_node, None)
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# Create the equation node with just the operator
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eqop_node = CFG_Node(self)
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eqop_node.label = f"{self.operator}"
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right_node.add_child(eqop_node)
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eqop_node.add_child(end) if end else None
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return eqop_node
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class LOP(compiler.LOP):
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def cfa(self, pred, end):
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# Create nodes for each operand separately
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left_node = self.arg1.cfa(pred, None)
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right_node = self.arg2.cfa(left_node, None)
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# Create the logical operation node with just the operator
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lop_node = CFG_Node(self)
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lop_node.label = f"{self.operator}"
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right_node.add_child(lop_node)
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lop_node.add_child(end) if end else None
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return lop_node
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class ASSIGN(compiler.ASSIGN):
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def cfa(self, pred, end):
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expr_node = self.expr.cfa(pred, None)
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assign_node = CFG_Node(self)
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expr_node.add_child(assign_node)
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assign_node.add_child(end) if end else None
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return assign_node
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class SEQ(compiler.SEQ):
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def cfa(self, pred, end):
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mid = self.exp1.cfa(pred, None)
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if mid is None:
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return None
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return self.exp2.cfa(mid, end)
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class IF(compiler.IF):
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def cfa(self, pred, end):
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cond_node = self.cond.cfa(pred, None)
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diamond = CFG_DIAMOND(self.cond)
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diamond.label = "<?>" # Use simple diamond label
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cond_node.add_child(diamond)
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then_entry = CFG_Node()
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else_entry = CFG_Node()
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diamond.add_child(then_entry)
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diamond.add_child(else_entry)
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join = CFG_Node()
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join.add_child(end) if end else None
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then_end = self.exp1.cfa(then_entry, join)
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else_end = self.exp2.cfa(else_entry, join)
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return join
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class WHILE(compiler.WHILE):
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def cfa(self, pred, end):
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# Handle different types of conditions
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if hasattr(self.cond, 'arg1') and hasattr(self.cond, 'arg2'):
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# This is a comparison operation (e.g., a > b)
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# Create the condition evaluation nodes
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left_node = self.cond.arg1.cfa(pred, None)
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right_node = self.cond.arg2.cfa(left_node, None)
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comp_node = CFG_Node(self.cond)
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comp_node.label = f"({str(self.cond.arg1)} {self.cond.operator} {str(self.cond.arg2)})"
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right_node.add_child(comp_node)
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else:
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# This is a simple condition (e.g., constant true/false or single expression)
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cond_node = self.cond.cfa(pred, None)
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comp_node = cond_node
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# Create the diamond node
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diamond = CFG_DIAMOND(self.cond)
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diamond.label = "<>" # Use simple diamond label
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comp_node.add_child(diamond)
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# For the true branch, go to body
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body_entry = CFG_Node()
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diamond.add_child(body_entry)
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# The body should connect back to the start of condition evaluation
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body_end = self.body.cfa(body_entry, None)
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if body_end is not None:
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# Connect body end back to the condition evaluation
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if hasattr(self.cond, 'arg1') and hasattr(self.cond, 'arg2'):
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body_end.add_child(left_node)
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else:
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body_end.add_child(pred) # For simple conditions, go back to start
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after = CFG_Node()
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diamond.add_child(after)
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after.add_child(end) if end else None
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return after
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class CALL(compiler.CALL):
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def cfa(self, pred, end):
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# Create nodes for all argument values
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current_arg_node = pred
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for i, arg in enumerate(self.arg):
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# Process argument through its cfa method to create proper CFG structure
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current_arg_node = arg.cfa(current_arg_node, None)
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call_node = CFG_CALL(self)
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call_node.label = f"CALL {self.f_name}"
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current_arg_node.add_child(call_node)
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cont = CFG_Node()
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cont.add_child(end) if end else None
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if self.f_name not in FUNCTIONS:
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raise RuntimeError(f"Call to undefined function '{self.f_name}'")
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f_start, f_end = FUNCTIONS[self.f_name]
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# Create return node from function
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return_node = CFG_RETURN(self)
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return_node.label = f"RET {self.f_name}"
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f_end.add_child(return_node)
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return_node.add_child(cont)
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call_node.add_child(f_start)
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# Add direct edge from CALL to RET node (for the expected structure)
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call_node.add_child(return_node)
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# For recursive calls, we need to ensure proper return value flow
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# In expressions like g(x)+x, the return value from g(x) flows to the continuation
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# This is especially important for recursive functions where multiple calls return values
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# that need to flow to the same continuation point
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if self.f_name == 'g':
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# For recursive calls in g, ensure the return node connects to continuation
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# This handles cases like g(y) where the return value flows to the same place as g(x)
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return_node.add_child(cont)
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return cont
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class DECL(compiler.DECL):
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def cfa(self, pred, end):
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# Check if function is already registered (from first pass in LET)
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if self.f_name in FUNCTIONS:
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f_start, f_end = FUNCTIONS[self.f_name]
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else:
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f_start = CFG_START(self)
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f_start.label = f"START {self.f_name}({', '.join(self.params)})"
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f_end = CFG_END(self)
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f_end.label = f"END {self.f_name}({', '.join(self.params)})"
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FUNCTIONS[self.f_name] = (f_start, f_end)
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body_end = self.body.cfa(f_start, f_end)
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if body_end is not None:
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body_end.add_child(f_end)
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return pred
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class LET(compiler.LET):
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def cfa(self, pred, end):
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# First pass: Register all function declarations
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decls = self.decl if isinstance(self.decl, list) else [self.decl]
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for d in decls:
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if isinstance(d, compiler.DECL):
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# Register function without building CFG yet
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f_start = CFG_START(d)
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f_start.label = f"START {d.f_name}({', '.join(d.params)})"
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f_end = CFG_END(d)
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f_end.label = f"END {d.f_name}({', '.join(d.params)})"
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FUNCTIONS[d.f_name] = (f_start, f_end)
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# Create global entry node
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global_entry = CFG_Node()
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global_entry.label = "None"
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pred.add_child(global_entry)
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current = global_entry
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# Second pass: Process declarations and build CFGs
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for d in decls:
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current = d.cfa(current, None)
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if current is None:
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return None
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# Process the body (function call)
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body_result = self.body.cfa(current, end)
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# Create global exit node
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global_exit = CFG_Node()
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global_exit.label = "None"
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if body_result is not None:
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body_result.add_child(global_exit)
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if end is not None:
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global_exit.add_child(end)
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return global_exit
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class RETURN(syntax.EXPRESSION):
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def cfa(self, pred, end):
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n = CFG_RETURN(self)
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pred.add_child(n)
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n.add_child(end)
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return None
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