96de5cf188
Adds the methods and type-narrowing overrides needed for Cfg.qll to be
a drop-in replacement for Flow.qll's CFG API surface:
* 'override getNode()' type narrowing on all AST-shape subclasses
(CallNode -> Py::Call, AttrNode -> Py::Attribute, ImportExprNode
-> Py::ImportExpr, etc.). This lets callers chain methods like
'iexpr.getNode().isRelative()' that previously failed because
'getNode()' returned the generic AstNode.
* 'ControlFlowNode.isBranch()' -- true and/or false successor exists.
* 'ControlFlowNode.getAChild()' -- CFG-level child traversal via the
AST's getAChildNode, with dominance constraint.
* 'ControlFlowNode.strictlyReaches(other)' -- node-level reachability.
* 'NameNode.isSelf()' -- AST-level approximation: uses the 'Variable'
that is the first parameter of an enclosing method.
* 'BinaryExprNode.operands(left, op, right)' + 'getAnOperand()'.
* 'BoolExprNode.getAnOperand()'.
* 'ForNode.getSequence()' (alias for 'getIter') and
'ForNode.iterates(target, sequence)'.
* 'ForNode' / 'RaiseStmtNode' type-narrowing overrides.
* 'ExceptFlowNode.getName()' / 'ExceptGroupFlowNode.getName()'
-- the bound 'as'-name CFG node.
* 'DictNode.getAKey()' (only 'getAValue' was present).
These additions are independent of the dataflow-migration approach
(option 4 vs option 5). They close the API-parity gap identified
during the Option-5 investigation; with them in place, hundreds of
type-resolution errors that previously appeared when swapping Cfg for
Flow at the python.qll level go away.
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>
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