Introduce generic `CompilerPhase` trait to unify different stages of the
bound AST. Rename `LocalSlot` to `VirtualId` and introduce `StackOffset`
for clearer distinction between compile-time and run-time addressing.
Update type aliases and implementations to reflect these changes.
Introduces a `StackAllocator` to manage local slot mapping during
lowering. This allows for efficient calculation of stack sizes for
lambdas and the root node. Tail position marking is now handled more
accurately.
Simplified the AST architecture by removing the overly complex Node<K,
T> structure and replacing it with specialized types for
each phase:
- Introduced UntypedNode in nodes.rs for the Parser and Macro system,
eliminating redundant ty: () initializations.
- Defined a new generic Node<T> in bound_nodes.rs for all compiler
stages, where T represents the phase-specific metadata.
- Updated the Binder to act as the bridge between UntypedNode and
Node<()>.
- Simplified type aliases: TypedNode, AnalyzedNode, and ExecNode now
leverage the streamlined Node<T> structure.
- Updated Parser, Macros, Type-Checker, Optimizer, and VM to reflect
the architectural changes.
- Fixed import chains and resolved needless borrows via clippy.
This change improves type safety, reduces boilerplate code in the
parser, and makes the compiler stages more idiomatic and
readable.
The TCO (Tail Call Optimization) module has been renamed to `lowering`.
This change better reflects the module's broader responsibility, which
includes not only TCO but also general AST transformations and
preparation for VM execution.
The `optimize` function has been renamed to `lower` to align with the
module's new name.
Michael Schimmel