Implements the MIR passes making up the portable tail-call elimination (a high-level description of how this works can be found here).

Imports

Procs

proc insertNewResult(body: var MirBody; g: ModuleGraph; owner: PSym; env: var MirEnv) {....raises: [Exception, ERecoverableError, KeyError], tags: [RootEffect, ReadDirEffect].}: First part of the .tailcall lowering. Changes the 'result' type to a Continuation type and turns the previous 'result' variable (if any) into a normal local. Source Edit
proc insertTrampolines(tree: MirTree; g: ModuleGraph; owner: PSym; env: var MirEnv; changes: var Changeset) {. ...raises: [Exception, ERecoverableError, KeyError], tags: [RootEffect, ReadDirEffect].}: Turns all non-tailcall invocations of .tailcall procedures into trampolines. Source Edit
proc lowerProcvals(tree: MirTree; env: var MirEnv; changes: var Changeset) {. ...raises: [Exception, ERecoverableError, KeyError], tags: [RootEffect, ReadDirEffect].}: Turns all procval creation for .tailcall procedures into procval creation of the associated application procedure. Source Edit
proc lowerTailcallBody(body: MirBody; g: ModuleGraph; owner: PSym; env: var MirEnv; changes: var Changeset) {. ...raises: [Exception, ERecoverableError, KeyError], tags: [RootEffect, ReadDirEffect].}: Second part of the .tailcall lowering. Lowers all 'tailcall' statements into constructing and returning a Continuation object. Source Edit