Full CPS conversion in one recursive rewrite. More...

#include <mim/plug/cps/phase/conv.h>

Inheritance diagram for mim::plug::cps::Conv:

Public Member Functions
	Conv (World &world, flags_t annex)
Public Member Functions inherited from mim::RWPhase
	RWPhase (World &world, std::string name, Analysis *analysis=nullptr)
	RWPhase (World &world, flags_t annex, Analysis *analysis=nullptr)
Analysis *	analysis ()
const Analysis *	analysis () const
const Def *	lattice (const Def *old_def) const
	Returns the abstract value computed by the associated Analysis for the given old-world Def, or nullptr if no value is available.
const Def *	abstracted (const Def *old_def) const
	Returns lattice(`old_def`) if it differs from `old_def` (i.e. we learned something), otherwise nullptr.
virtual bool	analyze ()
	Runs the optional pre-analysis on RWPhase::old_world(), typically to a fixed point, before rewriting begins.
virtual void	rewrite_annex (flags_t, Sym, const Def *)
virtual void	rewrite_external (Def *)
bool	is_bootstrapping () const
	Returns whether we are currently bootstrapping (rewriting annexes).
World &	world ()=delete
	Hides both and forbids direct access.
World &	old_world ()
	Get old Defs from here.
World &	new_world ()
	Create new Defs into this.
Public Member Functions inherited from mim::Phase
	Phase (World &world, std::string name)
	Phase (World &world, flags_t annex)
virtual	~Phase ()=default
virtual std::unique_ptr< Phase >	recreate ()
	Creates a new instance; needed by a fixed-point PhaseMan.
virtual void	apply (const App *)
	Invoked if your Phase has additional args.
virtual void	apply (Phase &)
	Dito, but invoked by Phase::recreate.
virtual bool	redirects () const
	If true, Phase::create uses take_resolved().
virtual std::unique_ptr< Phase >	take_resolved ()
	The Phase to use instead; nullptr means elide.
World &	world ()
Driver &	driver ()
Log &	log () const
std::string_view	name () const
flags_t	annex () const
const Vector< std::string > &	args ()
	Command-line arguments passed to this Phase's plugin via -X <plugin>:<arg>.
bool	todo () const
void	invalidate (bool todo=true)
	Signals that another round of fixed-point iteration is required, either as part of.
virtual void	run ()
	Entry point and generates some debug output; invokes Phase::start.
void	profile_count (std::string_view key, uint64_t n=1)
	Adds `n` to the custom Profiler counter `key` of the current run; no-op unless profiling is enabled.
Public Member Functions inherited from mim::Rewriter
template<class D = Def>
D *	curr_mut () const
	Rewriter (std::unique_ptr< World > &&ptr)
	Rewriter (World &world)
virtual	~Rewriter ()
void	reset (std::unique_ptr< World > &&ptr)
void	reset ()
World &	world ()
virtual void	push ()
virtual void	pop ()
const Def *	map (const Def *old_def, Defs new_defs)
const Def *	map (Defs old_defs, const Def *new_def)
const Def *	map (Defs old_defs, Defs new_defs)
virtual const Def *	lookup (const Def *old_def)
	Lookup old_def by searching in reverse through the stack of maps.
virtual const Def *	rewrite (const Def *)
virtual const Def *	rewrite_imm (const Def *)
virtual const Def *	rewrite_mut (Def *)
virtual const Def *	rewrite_stub (Def , Def )
virtual DefVec	rewrite (Defs)
virtual const Def *	rewrite_imm_Seq (const Seq *seq)
virtual const Def *	rewrite_mut_Seq (Seq *seq)

Private Member Functions
const Def *	rewrite_mut_Lam (Lam *) final
const Def *	rewrite_imm_App (const App *) final
const Def *	map (const Def , const Def ) final

Additional Inherited Members
Static Public Member Functions inherited from mim::Phase
static std::unique_ptr< Phase >	create (const Flags2Phases &phases, const Def *def)
template<class A, class P>
static void	hook (Flags2Phases &phases)
template<class P, class... Args>
static void	run (Args &&... args)
	Runs a single Phase.
Protected Member Functions inherited from mim::RWPhase
void	start () override
	Actual entry.
Protected Member Functions inherited from mim::Rewriter
auto	enter (Def *new_mut)
	Updates curr_mut() to `new_mut` and restores it at the end of the scope.
Protected Attributes inherited from mim::Phase
std::string	name_
Protected Attributes inherited from mim::Rewriter
std::deque< Def2Def >	old2news_

Detailed Description

Full CPS conversion in one recursive rewrite.

Each term-level, direct-style function

f: [a: A] → B

becomes

f_cps: Cn [a: A, Cn B]

and every use of f is replaced by cps.cps2ds_dep (A, λ a: B) f_cps to remain type-correct.

Call sites are lifted on the fly: When the recursive rewrite encounters App (cps.cps2ds_dep (T, U) k) arg inside a continuation, it allocates a fresh continuation cont receiving the result, records the pending call k (arg, cont), and uses cont's variable as the value of the App. Once the enclosing Lam is done, the pending calls are wired up in encounter order - which respects data dependencies, because operands are always rewritten before their users:

lam   = k₀ (arg₀, cont₀)
cont₀ = k₁ (arg₁, cont₁)
...
contₙ = rewritten body of lam

A lifted call simply lives in the Lam whose body rewriting first reaches it. Rewrites whose result mentions such a continuation variable are scoped to that Lam (see Conv::map) and re-derived - and thus re-lifted - in sibling scopes.

Definition at line 35 of file conv.h.

Constructor & Destructor Documentation

◆ Conv()

mim::plug::cps::Conv::Conv	(	World &	world,
		flags_t	annex )

inline

Definition at line 37 of file conv.h.

References mim::Phase::annex(), mim::RWPhase::RWPhase(), and mim::RWPhase::world().

Member Function Documentation

◆ map()

const Def * mim::plug::cps::Conv::map	(	const Def *	old_def,
		const Def *	new_def )

finalprivatevirtual

Reimplemented from mim::Rewriter.

Definition at line 15 of file conv.cpp.

References mim::Def::free_vars(), mim::Sets< D, N >::Set::has_intersection(), and mim::Rewriter::old2news_.

Referenced by rewrite_mut_Lam().

◆ rewrite_imm_App()

const Def * mim::plug::cps::Conv::rewrite_imm_App ( const App * old_app )

finalprivate

Definition at line 70 of file conv.cpp.

References mim::World::app(), mim::App::arg(), mim::App::callee(), mim::Axm::isa(), mim::RWPhase::new_world(), and mim::Rewriter::rewrite().

◆ rewrite_mut_Lam()

const Def * mim::plug::cps::Conv::rewrite_mut_Lam ( Lam * old_lam )

finalprivate

Definition at line 20 of file conv.cpp.

References mim::Lam::body(), mim::plug::cps::convertible(), mim::Lam::filter(), mim::RWPhase::is_bootstrapping(), mim::Def::is_set(), mim::Lam::isa_cn(), map(), mim::World::mut_lam(), mim::RWPhase::new_world(), mim::Rewriter::rewrite(), and mim::Lam::type().

The documentation for this class was generated from the following files:

include/mim/plug/cps/phase/conv.h
src/mim/plug/cps/phase/conv.cpp

Public Member Functions

Private Member Functions