Qiskit / qiskit / 8727857117

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github

Committed by web-flow

Commit Message

Refactor Rust crates to build a single extension module (#12134)

* Refactor Rust crates to build a single extension module

Previously we were building three different Python extension modules out
of Rust space.  This was convenient for logical separation of the code,
and for making the incremental compilations of the smaller crates
faster, but had the disadvantage that `qasm2` and `qasm3` couldn't
access the new circuit data structures directly from Rust space and had
to go via Python.

This modifies the crate structure to put the Rust-space acceleration
logic into crates that we only build as Rust libraries, then adds
another (`pyext`) crate to be the only that that actually builds as
shared Python C extension.  This then lets the Rust crates interact with
each other (and the Rust crates still contain PyO3 Python-binding logic
internally) and accept and output each others' Python types.

The one Python extension is still called `qiskit._accelerate`, but it's
built by the Rust crate `qiskit-pyext`.  This necessitated some further
changes, since `qiskit._accelerate` now contains acccelerators for lots
of parts of the Qiskit package hierarchy, but needs to have a single
low-level place to initialise itself:

- The circuit logic `circuit` is separated out into its own separate
  crate so that this can form the lowest part of the Rust hierarchy.
  This is done so that `accelerate` with its grab-bag of accelerators
  from all over the place does not need to be the lowest part of the
  stack.  Over time, it's likely that everything will start touching
  `circuit` anyway.

- `qiskit._qasm2` and `qiskit._qasm3` respectively became
  `qiskit._accelerate.qasm2` and `qiskit._accelerate.qasm3`, since they
  no longer get their own extension modules.

- `qasm3` no longer stores a Python object on itself during module
  initialisation that depended on `qiskit.circuit.library` to create.
  Now, the Python-space `qiskit.qasm3` does that and the `qasm3` crate
  just... (continued)

Run Details

94 of 97 new or added lines in 19 files covered. (96.91%)

25 existing lines in 3 files now uncovered.

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