Combined η-normalization: folds η-reduction and η-expansion into a single, idempotent phase. More...

#include <mim/phase/eta_conv.h>

Inheritance diagram for mim::EtaConv:

Public Member Functions
	EtaConv (World &world)
	EtaConv (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.
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 ()
virtual const Def *	map (const Def old_def, const Def new_def)
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_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
bool	analyze () final
	Runs the optional pre-analysis on RWPhase::old_world(), typically to a fixed point, before rewriting begins.
void	rewrite_annex (flags_t, Sym, const Def *) final
void	rewrite_external (Def *) final
const Def *	rewrite (const Def *) final
const Def *	rewrite_imm_App (const App *) final
const Def *	rewrite_imm_Var (const Var *) 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

Combined η-normalization: folds η-reduction and η-expansion into a single, idempotent phase.

A Lam should appear either only in callee position (Known) or not (Unknown). A Lam that occurs in an unknown position more than once (Unknown_N) or in both positions (Both) is η-expanded (g f -> g (λx.f x)); a genuine η-redex λx.f x whose f does not want to be expanded is η-reduced.

The analysis is wrapper-transparent: a use of a wrapper λx.f x is counted as a use of f at the same position/multiplicity instead of counting f as Known (the wrapper's callee). This makes f's classification identical whether f is bare or wrapped, so the canonical η-form is a genuine fixed point - the phase does not fight itself and can share one big %compile.phases tt fixed-point loop with BetaRed and %mem.seo without oscillating.

Definition at line 21 of file eta_conv.h.

Constructor & Destructor Documentation

◆ EtaConv() [1/2]

mim::EtaConv::EtaConv ( World & world )

inline

Definition at line 23 of file eta_conv.h.

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

◆ EtaConv() [2/2]

mim::EtaConv::EtaConv	(	World &	world,
		flags_t	annex )

inline

Definition at line 25 of file eta_conv.h.

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

Member Function Documentation

◆ analyze()

bool mim::EtaConv::analyze ( )

finalprivatevirtual

Runs the optional pre-analysis on RWPhase::old_world(), typically to a fixed point, before rewriting begins.

If analysis() is set, this is the natural place to iterate until Phase::todo() becomes false. If no Analysis is needed, simply return false.

Reimplemented from mim::RWPhase.

Definition at line 5 of file eta_conv.cpp.

References mim::RWPhase::old_world().

◆ rewrite()

const Def * mim::EtaConv::rewrite ( const Def * old_def )

finalprivatevirtual

Reimplemented from mim::Rewriter.

Definition at line 43 of file eta_conv.cpp.

References DLOG, mim::Lam::eta_expand(), mim::Phase::invalidate(), mim::Phase::profile_count(), rewrite(), and mim::Rewriter::rewrite().

Referenced by rewrite(), and rewrite_imm_App().

◆ rewrite_annex()

void mim::EtaConv::rewrite_annex	(	flags_t	flags,
		Sym	sym,
		const Def *	def )

finalprivatevirtual

Reimplemented from mim::RWPhase.

Definition at line 34 of file eta_conv.cpp.

References mim::World::annexes(), mim::World::Annexes::attach(), and mim::RWPhase::new_world().

◆ rewrite_external()

void mim::EtaConv::rewrite_external ( Def * old_mut )

finalprivatevirtual

Reimplemented from mim::RWPhase.

Definition at line 38 of file eta_conv.cpp.

References mim::Def::as_mut(), and mim::Def::is_external().

◆ rewrite_imm_App()

const Def * mim::EtaConv::rewrite_imm_App ( const App * app )

finalprivate

Definition at line 79 of file eta_conv.cpp.

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

◆ rewrite_imm_Var()

const Def * mim::EtaConv::rewrite_imm_Var ( const Var * var )

finalprivate

Definition at line 84 of file eta_conv.cpp.

References mim::Var::binder(), mim::RWPhase::new_world(), and mim::World::var().

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

include/mim/phase/eta_conv.h
src/mim/phase/eta_conv.cpp

Public Member Functions

Private Member Functions

Additional Inherited Members

Detailed Description

Constructor & Destructor Documentation

◆ EtaConv() [1/2]

◆ EtaConv() [2/2]

Member Function Documentation

◆ analyze()

◆ rewrite()

◆ rewrite_annex()

◆ rewrite_external()

◆ rewrite_imm_App()

◆ rewrite_imm_Var()