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compiler.lisp
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;;;;------------------------------------------------------------------
;;;;
;;;; Copyright (C) 2001,2000, 2002-2005,
;;;; Department of Computer Science, University of Tromso, Norway
;;;;
;;;; Description: A simple lisp compiler.
;;;; Author: Frode Vatvedt Fjeld <frodef@acm.org>
;;;; Created at: Wed Oct 25 12:30:49 2000
;;;; Distribution: See the accompanying file COPYING.
;;;;
;;;; $Id: compiler.lisp,v 1.205 2008-04-27 19:07:33 ffjeld Exp $
;;;;
;;;;------------------------------------------------------------------
(in-package movitz)
(defvar *warn-function-change-p* t
"Emit a warning whenever a named function's code-vector changes size.")
(defvar *compiler-verbose-p* nil)
(defvar *compiler-do-optimize* t
"Apply the peephole optimizer to function code.")
(defvar *explain-peephole-optimizations* nil
"Emit some cryptic information about which peephole optimization
heuristics that fire. Used for debugging the optimizer.")
(defvar *compiler-use-cmov-p* nil
"Allow the compiler to emit CMOV instructions, making the code
incompatible with pre-pentium CPUs.")
(defvar *compiler-auto-stack-checks-p* t
"Make every compiled function check upon entry that the
stack-pointer is within bounds. Costs 3 code-bytes and a few cycles.")
(defvar *compiler-allow-transients* t
"Allow the compiler to keep function arguments solely in registers.
Hurst debugging, improves performance.")
(defvar *compiler-local-segment-prefix* '(:fs-override)
"Use these assembly-instruction prefixes when accessing the thread-local
run-time context.")
(defvar *compiler-global-segment-prefix* nil
"Use these assembly-instruction prefixes when accessing the global
run-time context.")
(defparameter *compiler-physical-segment-prefix* '(:gs-override)
"Use this instruction prefix when accessing a physical memory location (i.e. typically some memory-mapped hardware device).")
(defparameter *compiler-nonlocal-lispval-read-segment-prefix* '()
"Use this segment prefix when reading a lispval at (potentially)
non-local locations.")
(defparameter *compiler-nonlocal-lispval-write-segment-prefix* '(:es-override)
"Use this segment prefix when writing a lispval at (potentially)
non-local locations.")
(defparameter *compiler-use-cons-reader-segment-protocol-p* nil)
(defparameter *compiler-cons-read-segment-prefix* '(:gs-override)
"Use this segment prefix for CAR and CDR, when using cons-reader protocol.")
(defvar *compiler-allow-untagged-word-bits* 0
"Allow (temporary) untagged values of this bit-size to exist, because
the system ensures one way or another that there can be no pointers below
this size.")
(defvar *compiler-use-into-unbound-protocol* t
"Use #x7fffffff as the <unbound-value> and thereby the INTO
instruction for checking whether a value is the unbound value.")
(defvar *compiler-compile-eval-whens* t
"When encountering (eval-when (:compile-toplevel) <code>),
compile, using the host compiler, the code rather than just using eval.")
(defvar *compiler-compile-macro-expanders* t
"For macros of any kind, compile the macro-expanders using the host compiler.")
(defvar *compiler-do-type-inference* t
"Spend time and effort performing type inference and optimization.")
(defvar *compiler-produce-defensive-code* t
"Try to make code be extra cautious.")
(defvar *compiler-relink-recursive-funcall* t
"If true, also recursive function calls look up the function through the function name,
which enables tracing of recursive functions.")
(defvar *compiler-trust-user-type-declarations-p* t)
(defvar *compiling-function-name* nil)
(defvar muerte.cl:*compile-file-pathname* nil)
(defvar *extended-code-expanders*
(make-hash-table :test #'eq))
(defvar *extended-code-find-write-binding-and-type*
(make-hash-table :test #'eq))
(defparameter +enter-stack-frame-code+
'((:pushl :ebp)
(:movl :esp :ebp)
(:pushl :esi)))
(defun duplicatesp (list)
"Returns TRUE iff at least one object occurs more than once in LIST."
(if (null list)
nil
(or (member (car list) (cdr list))
(duplicatesp (cdr list)))))
(defun compute-call-extra-prefix (pc size)
(let* ((return-pointer-tag (ldb (byte 3 0)
(+ pc size))))
(cond
((or (= (tag :even-fixnum) return-pointer-tag)
(= (tag :odd-fixnum) return-pointer-tag))
;; Insert a NOP
'(#x90))
;;; ((= 3 return-pointer-tag)
;;; ;; Insert two NOPs, 3 -> 5
;;; '(#x90 #x90))
((= (tag :character) return-pointer-tag)
;; Insert three NOPs, 2 -> 5
'(#x90 #x90 #x90)
'(#x90)))))
(defun make-compiled-primitive (form environment top-level-p docstring)
"Primitive functions have no funobj, no stack-frame, and no implied
parameter/return value passing conventions."
(declare (ignore top-level-p docstring))
(let* ((env (make-local-movitz-environment environment nil))
(body-code (compiler-call #'compile-form
:form form
:funobj nil
:env env
:top-level-p nil
:result-mode :ignore))
;; (ignmore (format t "~{~S~%~}" body-code))
(resolved-code (finalize-code body-code nil nil)))
(multiple-value-bind (code-vector symtab)
(let ((asm-x86:*cpu-mode* :32-bit)
(asm:*instruction-compute-extra-prefix-map*
'((:call . compute-call-extra-prefix))))
(asm:assemble-proglist (translate-program resolved-code :muerte.cl :cl)
:symtab (list (cons :nil-value (image-nil-word *image*)))))
(values (make-movitz-vector (length code-vector)
:element-type 'code
:initial-contents code-vector)
symtab))))
(defun register-function-code-size (funobj)
(let* ((name (movitz-print (movitz-funobj-name funobj)))
(hash-name name)
(new-size (length (movitz-vector-symbolic-data (movitz-funobj-code-vector funobj)))))
(assert name)
(let ((old-size (gethash hash-name (function-code-sizes *image*))))
(cond
((not old-size))
((not *warn-function-change-p*))
((> new-size old-size)
(warn "~S grew from ~D to ~D bytes." name old-size new-size))
((< new-size old-size)
(warn "~S shrunk from ~D to ~D bytes" name old-size new-size))))
(setf (gethash hash-name (function-code-sizes *image*)) new-size))
funobj)
(defclass movitz-funobj-pass1 ()
((name
:initarg :name
:accessor movitz-funobj-name)
(lambda-list
:initarg :lambda-list
:accessor movitz-funobj-lambda-list)
(function-envs
:accessor function-envs)
(funobj-env
:initarg :funobj-env
:accessor funobj-env)
(extent
:initarg :extent
:initform :unused
:accessor movitz-funobj-extent)
(allocation
:initform nil
:accessor movitz-allocation)
(entry-protocol
:initform :default
:initarg :entry-protocol
:reader funobj-entry-protocol))
(:documentation "This class is used for funobjs during the first compiler pass.
Before the second pass, such objects will be change-class-ed to proper movitz-funobjs.
This way, we ensure that no undue side-effects on the funobj occur during pass 1."))
(defmethod print-object ((object movitz-funobj-pass1) stream)
(print-unreadable-object (object stream :type t :identity t)
(when (slot-boundp object 'name)
(write (movitz-funobj-name object) :stream stream)))
object)
(defun movitz-macro-expander-make-function (lambda-form &key name (type :unknown))
"Make a lambda-form that is a macro-expander into a proper function.
Gensym a name whose symbol-function is set to the macro-expander, and return that symbol."
(let ((function-name (gensym (format nil "~A-expander-~@[~A-~]" type name))))
(if *compiler-compile-macro-expanders*
(with-host-environment ()
(compile function-name lambda-form))
(setf (symbol-function function-name)
(coerce lambda-form 'function)))
function-name))
(defun make-compiled-funobj (name lambda-list declarations form env top-level-p &key funobj)
"Compiler entry-point for making a (lexically) top-level function."
(handler-bind (((or warning error)
(lambda (c)
(declare (ignore c))
(if (not (boundp 'muerte.cl:*compile-file-pathname*))
(format *error-output*
"~&;; While Movitz compiling ~S:" name)
(format *error-output*
"~&;; While Movitz compiling ~S in ~A:"
name muerte.cl:*compile-file-pathname*)))))
(with-retries-until-true (retry-funobj "Retry compilation of ~S." name)
(make-compiled-funobj-pass2
(make-compiled-funobj-pass1 name lambda-list declarations
form env top-level-p :funobj funobj)))))
(defun make-compiled-funobj-pass1 (name lambda-list declarations form env top-level-p
&key funobj)
"Per funobj (i.e. not necessarily top-level) entry-point for first-pass compilation.
If funobj is provided, its identity will be kept, but its type (and values) might change."
;; The ability to provide funobj's identity is important when a
;; function must be referenced before it can be compiled, e.g. for
;; mutually recursive (lexically bound) functions.
(multiple-value-bind (required-vars optional-vars rest-var key-vars aux-vars allow-p min max edx-var)
(decode-normal-lambda-list lambda-list)
(declare (ignore aux-vars allow-p min max))
;; There are several main branches through the function
;; compiler, and this is where we decide which one to take.
(funcall (cond
((let ((sub-form (cddr form)))
(and (consp (car sub-form))
(eq 'muerte::numargs-case (caar sub-form))))
'make-compiled-function-pass1-numarg-case)
((and (= 1 (length required-vars)) ; (x &optional y)
(= 1 (length optional-vars))
(movitz-constantp (nth-value 1 (decode-optional-formal (first optional-vars)))
env)
(null key-vars)
(not rest-var)
(not edx-var))
'make-compiled-function-pass1-1req1opt)
(t 'make-compiled-function-pass1))
name
lambda-list
declarations
form
env
top-level-p
funobj)))
(defun ensure-pass1-funobj (funobj class &rest init-args)
"If funobj is nil, return a fresh funobj of class.
Otherwise coerce funobj to class."
(apply #'reinitialize-instance
(if funobj
(change-class funobj class)
(make-instance class))
init-args))
(defun make-compiled-function-pass1-numarg-case (name lambda-list declarations form env top-level-p funobj)
(let* ((funobj (ensure-pass1-funobj funobj 'movitz-funobj-pass1
:entry-protocol :numargs-case
:name name
:lambda-list (movitz-read (lambda-list-simplify lambda-list))))
(funobj-env (make-local-movitz-environment env funobj :type 'funobj-env)))
(setf (funobj-env funobj) funobj-env
(function-envs funobj) nil)
(loop for (numargs lambda-list . clause-body) in (cdr (caddr form))
do (when (duplicatesp lambda-list)
(error "There are duplicates in lambda-list ~S." lambda-list))
(multiple-value-bind (clause-body clause-declarations)
(parse-declarations-and-body clause-body)
(let* ((function-env
(add-bindings-from-lambda-list lambda-list
(make-local-movitz-environment
funobj-env funobj
:type 'function-env
:declaration-context :funobj
:declarations
(append clause-declarations
declarations))))
(function-form (list* 'muerte.cl::block
(compute-function-block-name name)
clause-body)))
(multiple-value-bind (arg-init-code need-normalized-ecx-p)
(make-function-arguments-init funobj function-env)
(setf (extended-code function-env)
(append arg-init-code
(compiler-call #'compile-form
:form (make-special-funarg-shadowing function-env function-form)
:funobj funobj
:env function-env
:top-level-p top-level-p
:result-mode :function)))
(setf (need-normalized-ecx-p function-env) need-normalized-ecx-p))
(push (cons numargs function-env)
(function-envs funobj)))))
funobj))
(defun make-compiled-function-pass1-1req1opt (name lambda-list declarations form env top-level-p funobj)
"Returns funobj."
(when (duplicatesp lambda-list)
(error "There are duplicates in lambda-list ~S." lambda-list))
(let* ((funobj (ensure-pass1-funobj funobj 'movitz-funobj-pass1
:entry-protocol :1req1opt
:name name
:lambda-list (movitz-read (lambda-list-simplify lambda-list))))
(funobj-env (make-local-movitz-environment env funobj :type 'funobj-env))
(function-env (add-bindings-from-lambda-list
lambda-list
(make-local-movitz-environment funobj-env funobj
:type 'function-env
:need-normalized-ecx-p nil
:declaration-context :funobj
:declarations declarations)))
(optional-env (make-local-movitz-environment function-env funobj
:type 'function-env)))
(setf (funobj-env funobj) funobj-env)
;; (print-code 'arg-init-code arg-init-code)
(setf (extended-code optional-env)
(compiler-call #'compile-form
:form (optional-function-argument-init-form
(movitz-binding (first (optional-vars function-env)) function-env nil))
:funobj funobj
:env optional-env
:result-mode :ebx))
(setf (extended-code function-env)
(append #+ignore arg-init-code
(compiler-call #'compile-form
:form (make-special-funarg-shadowing function-env form)
:funobj funobj
:env function-env
:top-level-p top-level-p
:result-mode :function)))
(setf (function-envs funobj)
(list (cons 'muerte.cl::t function-env)
(cons :optional optional-env)))
funobj))
(defun make-compiled-function-pass1 (name lambda-list declarations form env top-level-p funobj)
"Returns funobj."
(when (duplicatesp lambda-list)
(error "There are duplicates in lambda-list ~S." lambda-list))
(let* ((funobj (ensure-pass1-funobj funobj 'movitz-funobj-pass1
:name name
:lambda-list (movitz-read (lambda-list-simplify lambda-list))))
(funobj-env (make-local-movitz-environment env funobj :type 'funobj-env))
(function-env (add-bindings-from-lambda-list
lambda-list
(make-local-movitz-environment funobj-env funobj
:type 'function-env
:declaration-context :funobj
:declarations declarations))))
(setf (funobj-env funobj) funobj-env
(function-envs funobj) (list (cons 'muerte.cl::t function-env)))
(multiple-value-bind (arg-init-code need-normalized-ecx-p)
(make-function-arguments-init funobj function-env)
(setf (need-normalized-ecx-p function-env) need-normalized-ecx-p)
(setf (extended-code function-env)
(append arg-init-code
(compiler-call #'compile-form
:form (make-special-funarg-shadowing function-env form)
:funobj funobj
:env function-env
:top-level-p top-level-p
:result-mode :function))))
funobj))
(defun make-compiled-funobj-pass2 (toplevel-funobj-pass1)
"This is the entry-poing for second pass compilation for each top-level funobj."
(check-type toplevel-funobj-pass1 movitz-funobj-pass1)
(let ((toplevel-funobj (change-class toplevel-funobj-pass1 'movitz-funobj)))
(multiple-value-bind (toplevel-funobj function-binding-usage)
(resolve-borrowed-bindings toplevel-funobj)
(complete-funobj
(layout-stack-frames
(analyze-bindings
(resolve-sub-functions toplevel-funobj function-binding-usage)))))))
(defstruct (type-analysis (:type list))
(thunks)
(binding-types)
(encoded-type
(multiple-value-list (type-specifier-encode nil)))
(declared-encoded-type
(multiple-value-list (type-specifier-encode t))))
(defun make-type-analysis-with-declaration (binding)
(let ((declared-type
(if (not (and *compiler-trust-user-type-declarations-p*
(movitz-env-get (binding-name binding) :variable-type
nil (binding-env binding) nil)))
(multiple-value-list (type-specifier-encode t))
(multiple-value-list
(type-specifier-encode (movitz-env-get (binding-name binding) :variable-type
t (binding-env binding) nil))))))
;; (warn "~S decl: ~A" binding (apply #'encoded-type-decode declared-type))
(make-type-analysis :declared-encoded-type declared-type)))
(defun analyze-bindings (toplevel-funobj)
"Figure out usage of bindings in a toplevel funobj.
Side-effects each binding's binding-store-type."
(if (not *compiler-do-type-inference*)
(labels
((analyze-code (code)
(dolist (instruction code)
(when (listp instruction)
(let ((binding
(find-written-binding-and-type instruction)))
(when binding
(setf (binding-store-type binding)
(multiple-value-list (type-specifier-encode t)))))
(analyze-code (instruction-sub-program instruction)))))
(analyze-funobj (funobj)
(loop for (nil . function-env) in (function-envs funobj)
do (analyze-code (extended-code function-env)))
(loop for function-binding in (sub-function-binding-usage funobj) by #'cddr
do (analyze-funobj (function-binding-funobj function-binding)))
funobj))
(analyze-funobj toplevel-funobj))
(let ((binding-usage (make-hash-table :test 'eq)))
(labels ((binding-resolved-p (binding)
(or (typep binding 'constant-object-binding)
(typep binding 'function-argument)
(let ((analysis (gethash binding binding-usage)))
(and analysis
(null (type-analysis-thunks analysis))))))
(binding-resolve (binding)
(cond
((not (bindingp binding))
binding)
((typep binding 'constant-object-binding)
(apply #'encoded-type-decode
(binding-store-type binding)))
((typep binding 'function-argument)
t)
((let ((analysis (gethash binding binding-usage)))
(assert (and (and analysis
(null (type-analysis-thunks analysis))))
(binding)
"Can't resolve unresolved binding ~S." binding)))
(*compiler-trust-user-type-declarations-p*
(let ((analysis (gethash binding binding-usage)))
(multiple-value-call #'encoded-type-decode
(apply #'encoded-types-and
(append (type-analysis-declared-encoded-type analysis)
(type-analysis-encoded-type analysis))))))
(t (let ((analysis (gethash binding binding-usage)))
(apply #'encoded-type-decode
(type-analysis-encoded-type analysis))))))
(type-is-t (type-specifier)
(or (eq type-specifier t)
(and (listp type-specifier)
(eq 'or (car type-specifier))
(some #'type-is-t (cdr type-specifier)))))
(analyze-store (binding type thunk thunk-args)
(assert (not (null type)) ()
"store-lexical with empty type.")
(assert (or (typep type 'binding)
(eql 1 (type-specifier-num-values type))) ()
"store-lexical with multiple-valued type: ~S for ~S" type binding)
#+ignore (warn "store ~S type ~S, thunk ~S" binding type thunk)
(let ((analysis (or (gethash binding binding-usage)
(setf (gethash binding binding-usage)
(make-type-analysis-with-declaration binding)))))
(cond
(thunk
(assert (some #'bindingp thunk-args))
(push (cons thunk thunk-args) (type-analysis-thunks analysis)))
((and (bindingp type)
(binding-eql type binding))
(break "got binding type")
nil)
(t (setf (type-analysis-encoded-type analysis)
(multiple-value-list
(multiple-value-call
#'encoded-types-or
(values-list (type-analysis-encoded-type analysis))
(type-specifier-encode type))))))))
(analyze-code (code)
#+ignore (print-code 'analyze code)
(dolist (instruction code)
(when (listp instruction)
(multiple-value-bind (store-binding store-type thunk thunk-args)
(find-written-binding-and-type instruction)
(when store-binding
#+ignore (warn "store: ~S binding ~S type ~S thunk ~S"
instruction store-binding store-type thunk)
(analyze-store store-binding store-type thunk thunk-args)))
(analyze-code (instruction-sub-program instruction)))))
(analyze-funobj (funobj)
(loop for (nil . function-env) in (function-envs funobj)
do (analyze-code (extended-code function-env)))
(loop for function-binding in (sub-function-binding-usage funobj) by #'cddr
do (analyze-funobj (function-binding-funobj function-binding)))
funobj))
;; 1. Examine each store to lexical bindings.
(analyze-funobj toplevel-funobj)
;; 2.
(flet ((resolve-thunks ()
(loop with more-thunks-p = t
repeat 20
while more-thunks-p
do (setf more-thunks-p nil)
(maphash (lambda (binding analysis)
(declare (ignore binding))
(setf (type-analysis-thunks analysis)
(loop for (thunk . thunk-args) in (type-analysis-thunks analysis)
if (not (every #'binding-resolved-p thunk-args))
collect (cons thunk thunk-args)
else
do #+ignore
(warn "because ~S=>~S->~S completing ~S: ~S and ~S"
thunk thunk-args
(mapcar #'binding-resolve thunk-args)
binding
(type-analysis-declared-encoded-type analysis)
(multiple-value-list
(multiple-value-call
#'encoded-types-or
(values-list
(type-analysis-encoded-type analysis))
(type-specifier-encode
(apply thunk (mapcar #'binding-resolve
thunk-args))))))
(setf (type-analysis-encoded-type analysis)
(multiple-value-list
(multiple-value-call
#'encoded-types-and
(values-list
(type-analysis-declared-encoded-type analysis))
(multiple-value-call
#'encoded-types-or
(values-list
(type-analysis-encoded-type analysis))
(type-specifier-encode
(apply thunk (mapcar #'binding-resolve
thunk-args)))))))
(setf more-thunks-p t))))
binding-usage))))
(resolve-thunks)
(when *compiler-trust-user-type-declarations-p*
;; For each unresolved binding, just use the declared type.
(maphash (lambda (binding analysis)
(declare (ignore binding))
(when (and (not (null (type-analysis-thunks analysis)))
(not (apply #'encoded-allp
(type-analysis-declared-encoded-type analysis))))
#+ignore
(warn "Trusting ~S, was ~S, because ~S [~S]"
binding
(type-analysis-encoded-type analysis)
(type-analysis-thunks analysis)
(loop for (thunk . thunk-args) in (type-analysis-thunks analysis)
collect (mapcar #'binding-resolved-p thunk-args)))
(setf (type-analysis-encoded-type analysis)
(type-analysis-declared-encoded-type analysis))
(setf (type-analysis-thunks analysis) nil))) ; Ignore remaining thunks.
binding-usage)
;; Try one more time to resolve thunks.
(resolve-thunks)))
#+ignore
(maphash (lambda (binding analysis)
(when (type-analysis-thunks analysis)
(warn "Unable to infer type for ~S: ~S" binding
(type-analysis-thunks analysis))))
binding-usage)
;; 3.
(maphash (lambda (binding analysis)
(setf (binding-store-type binding)
(cond
((and (not (null (type-analysis-thunks analysis)))
*compiler-trust-user-type-declarations-p*
(movitz-env-get (binding-name binding) :variable-type nil
(binding-env binding) nil))
(multiple-value-list
(type-specifier-encode (movitz-env-get (binding-name binding) :variable-type
t (binding-env binding) nil))))
((and *compiler-trust-user-type-declarations-p*
(movitz-env-get (binding-name binding) :variable-type nil
(binding-env binding) nil))
(multiple-value-list
(multiple-value-call #'encoded-types-and
(type-specifier-encode (movitz-env-get (binding-name binding) :variable-type
t (binding-env binding) nil))
(values-list (type-analysis-encoded-type analysis)))))
((not (null (type-analysis-thunks analysis)))
(multiple-value-list (type-specifier-encode t)))
(t (type-analysis-encoded-type analysis))))
#+ignore (warn "Finally: ~S" binding))
binding-usage))))
toplevel-funobj)
(defun resolve-borrowed-bindings (toplevel-funobj)
"For <funobj>'s code, for every non-local binding used we create
a borrowing-binding in the funobj-env. This process must be done
recursively, depth-first wrt. sub-functions. Also, return a plist
of all function-bindings seen."
(check-type toplevel-funobj movitz-funobj)
(let ((function-binding-usage ()))
(labels ((process-binding (funobj binding usages)
(when (typep binding 'function-binding)
(dolist (usage usages)
(pushnew usage
(getf (sub-function-binding-usage (function-binding-parent binding))
binding))
(pushnew usage (getf function-binding-usage binding))))
(cond
((typep binding 'constant-object-binding))
((not (eq funobj (binding-funobj binding)))
(let ((borrowing-binding
(or (find binding (borrowed-bindings funobj)
:key #'borrowed-binding-target)
(car (push (movitz-env-add-binding (funobj-env funobj)
(make-instance 'borrowed-binding
:name (binding-name binding)
:target-binding binding))
(borrowed-bindings funobj))))))
;; We don't want to borrow a forwarding-binding..
(when (typep (borrowed-binding-target borrowing-binding)
'forwarding-binding)
(change-class (borrowed-binding-target borrowing-binding)
'located-binding))
;;; (warn "binding ~S of ~S is not local to ~S, replacing with ~S of ~S."
;;; binding (binding-env binding) funobj
;;; borrowing-binding (binding-env borrowing-binding))
;;; (pushnew borrowing-binding
;;; (getf (binding-lended-p binding) :lended-to))
(dolist (usage usages)
(pushnew usage (borrowed-binding-usage borrowing-binding)))
borrowing-binding))
(t ; Binding is local to this funobj
(typecase binding
(forwarding-binding
(process-binding funobj (forwarding-binding-target binding) usages))
(t binding)))))
(resolve-sub-funobj (funobj sub-funobj)
(dolist (binding-we-lend (borrowed-bindings (resolve-funobj-borrowing sub-funobj)))
#+ignore
(warn "Lending from ~S to ~S: ~S <= ~S"
funobj sub-funobj
(borrowed-binding-target binding-we-lend)
binding-we-lend)
(process-binding funobj
(borrowed-binding-target binding-we-lend)
(borrowed-binding-usage binding-we-lend))))
(resolve-code (funobj code)
(dolist (instruction code)
(when (listp instruction)
(let ((store-binding (find-written-binding-and-type instruction)))
(when store-binding
(process-binding funobj store-binding '(:write))))
(dolist (load-binding (find-read-bindings instruction))
(process-binding funobj load-binding '(:read)))
(case (car instruction)
(:call-lexical
(process-binding funobj (second instruction) '(:call)))
(:stack-cons
(destructuring-bind (proto-cons dynamic-scope)
(cdr instruction)
(push proto-cons (dynamic-extent-scope-members dynamic-scope))))
(:load-lambda
(destructuring-bind (lambda-binding lambda-result-mode capture-env)
(cdr instruction)
(declare (ignore lambda-result-mode))
(assert (eq funobj (binding-funobj lambda-binding)) ()
"A non-local lambda doesn't make sense. There must be a bug.")
(let ((lambda-funobj (function-binding-funobj lambda-binding)))
(let ((dynamic-scope (find-dynamic-extent-scope capture-env)))
(when dynamic-scope
;; (warn "Adding ~S to ~S/~S" lambda-funobj dynamic-extent dynamic-scope)
(setf (movitz-funobj-extent lambda-funobj) :dynamic-extent
(movitz-allocation lambda-funobj) dynamic-scope)
(push lambda-funobj (dynamic-extent-scope-members dynamic-scope))
(process-binding funobj (base-binding dynamic-scope) '(:read))))
(resolve-sub-funobj funobj lambda-funobj)
(process-binding funobj lambda-binding '(:read))
;; This funobj is effectively using every binding that the lambda
;; is borrowing..
(map nil (lambda (borrowed-binding)
(process-binding funobj
(borrowed-binding-target borrowed-binding)
'(:read)))
(borrowed-bindings (function-binding-funobj lambda-binding))))))
(:local-function-init
(let ((function-binding (second instruction)))
(assert (eq funobj (binding-funobj function-binding)) ()
"Initialization of a non-local function doesn't make sense.")
(resolve-sub-funobj funobj (function-binding-funobj (second instruction)))
(map nil (lambda (borrowed-binding)
(process-binding funobj
(borrowed-binding-target borrowed-binding)
'(:read)))
(borrowed-bindings (function-binding-funobj (second instruction)))))))
(resolve-code funobj (instruction-sub-program instruction)))))
(resolve-funobj-borrowing (funobj)
(let ((funobj (change-class funobj 'movitz-funobj :borrowed-bindings nil)))
(loop for (nil . function-env) in (function-envs funobj)
do (resolve-code funobj (extended-code function-env)))
;; (warn "~S borrows ~S." funobj (borrowed-bindings funobj))
funobj)))
(values (resolve-funobj-borrowing toplevel-funobj)
function-binding-usage))))
(defun resolve-sub-functions (toplevel-funobj function-binding-usage)
(assert (null (borrowed-bindings toplevel-funobj)) ()
"Can't deal with toplevel closures yet. Borrowed: ~S"
(borrowed-bindings toplevel-funobj))
(setf (movitz-funobj-extent toplevel-funobj) :indefinite-extent)
(let ((sub-funobj-index 0))
(loop for (function-binding usage) on function-binding-usage by #'cddr
do (let ((sub-funobj (function-binding-funobj function-binding)))
;; (warn "USage: ~S => ~S" sub-funobj usage)
(case (car (movitz-funobj-name sub-funobj))
((muerte.cl:lambda)
(setf (movitz-funobj-name sub-funobj)
(list 'muerte.cl:lambda
(movitz-funobj-name toplevel-funobj)
(post-incf sub-funobj-index)))))
(loop for borrowed-binding in (borrowed-bindings sub-funobj)
do (pushnew borrowed-binding
(getf (binding-lending (borrowed-binding-target borrowed-binding))
:lended-to)))
;; (warn "old extent: ~S" (movitz-funobj-extent sub-funobj))
(cond
((or (null usage)
(null (borrowed-bindings sub-funobj)))
(when (null usage)
(warn "null usage for ~S" sub-funobj))
(change-class function-binding 'funobj-binding)
(setf (movitz-funobj-extent sub-funobj)
:indefinite-extent))
((equal usage '(:call))
(change-class function-binding 'closure-binding)
(setf (movitz-funobj-extent sub-funobj)
:lexical-extent))
((eq :dynamic-extent (movitz-funobj-extent sub-funobj))
(change-class function-binding 'closure-binding))
(t (change-class function-binding 'closure-binding)
(setf (movitz-funobj-extent sub-funobj)
:indefinite-extent))))))
;; Each time we change a function-binding to funobj-binding, that binding
;; no longer needs to be borrowed (because it doesn't share lexical bindings),
;; and therefore should be removed from any borrowed-binding list, which in
;; turn can cause the borrowing funobj to become a funobj-binding, and so on.
(loop for modified-p = nil
do (loop for function-binding in function-binding-usage by #'cddr
do (let ((sub-funobj (function-binding-funobj function-binding)))
(when (not (null (borrowed-bindings sub-funobj)))
(check-type function-binding closure-binding)
(when (null (setf (borrowed-bindings sub-funobj)
(delete-if (lambda (b)
(when (typep (borrowed-binding-target b) 'funobj-binding)
(setf modified-p t)))
(borrowed-bindings sub-funobj))))
(change-class function-binding 'funobj-binding)))))
while modified-p)
(loop for function-binding in function-binding-usage by #'cddr
do (finalize-funobj (function-binding-funobj function-binding)))
(finalize-funobj toplevel-funobj))
(defun finalize-funobj (funobj)
"Calculate funobj's constants, jumpers."
(loop with all-key-args-constants = nil
with all-constants-plist = () and all-jumper-sets = ()
for (nil . function-env) in (function-envs funobj)
;; (borrowed-bindings body-code) in code-specs
as body-code = (extended-code function-env)
as (const-plist jumper-sets key-args-constants) =
(multiple-value-list (find-code-constants-and-jumpers body-code))
do (when key-args-constants
(assert (not all-key-args-constants) ()
"only one &key parsing allowed per funobj.")
(setf all-key-args-constants key-args-constants))
(loop for (constant usage) on const-plist by #'cddr
do (incf (getf all-constants-plist constant 0) usage))
(loop for (name set) on jumper-sets by #'cddr
do (assert (not (getf all-jumper-sets name)) ()
"Jumper-set ~S multiply defined." name)
(setf (getf all-jumper-sets name) set))
finally
(multiple-value-bind (const-list num-jumpers jumpers-map borrower-map)
(layout-funobj-vector all-constants-plist
all-key-args-constants
#+ignore (mapcar (lambda (x)
(cons (movitz-read x) 1))
'(:a :b :c :d))
all-jumper-sets
(borrowed-bindings funobj))
(setf (movitz-funobj-num-jumpers funobj) num-jumpers
(movitz-funobj-const-list funobj) const-list
(movitz-funobj-num-constants funobj) (length const-list)
(movitz-funobj-jumpers-map funobj) jumpers-map)
(loop for (binding . pos) in borrower-map
do (setf (borrowed-binding-reference-slot binding) pos))
(return funobj))))
(defun layout-stack-frames (funobj)
"Lay out the stack-frame (i.e. create a frame-map) for funobj
and all its local functions. This must be done breadth-first, because
a (lexical-extent) sub-function might care about its parent frame-map."
(loop for (nil . function-env) in (function-envs funobj)
do (assert (not (slot-boundp function-env 'frame-map)))
(setf (frame-map function-env)
(funobj-assign-bindings (extended-code function-env)
function-env)))
(loop for (sub-function-binding) on (sub-function-binding-usage funobj) by #'cddr
do (layout-stack-frames (function-binding-funobj sub-function-binding)))
funobj)
(defun complete-funobj (funobj)
(case (funobj-entry-protocol funobj)
(:1req1opt
(complete-funobj-1req1opt funobj))
(t (complete-funobj-default funobj)))
(loop for (sub-function-binding) on (sub-function-binding-usage funobj) by #'cddr
do (complete-funobj (function-binding-funobj sub-function-binding)))
(register-function-code-size funobj))
(defun complete-funobj-1req1opt (funobj)
(assert (= 2 (length (function-envs funobj))))
(let* ((function-env (cdr (assoc 'muerte.cl::t (function-envs funobj))))
(optional-env (cdr (assoc :optional (function-envs funobj))))
(frame-map (frame-map function-env))
(resolved-code (finalize-code (extended-code function-env) funobj frame-map))
(resolved-optional-code (finalize-code (extended-code optional-env) funobj frame-map))
(stack-frame-size (frame-map-size (frame-map function-env)))
(use-stack-frame-p (or (plusp stack-frame-size)
(tree-search resolved-code
'(:pushl :popl :ebp :esp :call :leave))
(some (lambda (x)
(and (not (equal '(:movl (:ebp -4) :esi) x))
(tree-search x ':esi)))
resolved-code))))
(let* ((function-code
(let* ((req-binding (movitz-binding (first (required-vars function-env))
function-env nil))
(req-location (cdr (assoc req-binding frame-map)))
(opt-binding (movitz-binding (first (optional-vars function-env))
function-env nil))
(opt-location (cdr (assoc opt-binding frame-map)))
(optp-binding (movitz-binding (optional-function-argument-supplied-p-var opt-binding)
function-env nil))
(optp-location (cdr (assoc optp-binding frame-map)))
(stack-setup-pre 0))
(append `((:jmp (:edi ,(global-constant-offset 'trampoline-cl-dispatch-1or2))))
'(entry%1op)
(unless (eql nil opt-location)
resolved-optional-code)
(when optp-location
`((:movl :edi :edx)
(:jmp 'optp-into-edx-ok)))
'(entry%2op)
(when optp-location
`((,*compiler-global-segment-prefix*
:movl (:edi ,(global-constant-offset 't-symbol)) :edx)
optp-into-edx-ok))
(when use-stack-frame-p
+enter-stack-frame-code+)
'(start-stack-frame-setup)
(cond
((and (eql 1 req-location)
(eql 2 opt-location))
(incf stack-setup-pre 2)
`((:pushl :eax)
(:pushl :ebx)))
((and (eql 1 req-location)
(eql nil opt-location))
(incf stack-setup-pre 1)
`((:pushl :eax)))
((and (member req-location '(nil :eax))
(eql 1 opt-location))
(incf stack-setup-pre 1)
`((:pushl :ebx)))
((and (member req-location '(nil :eax))
(member opt-location '(nil :ebx)))
nil)
(t (error "Can't deal with req ~S opt ~S."
req-location opt-location)))
(cond
((not optp-location)
(make-stack-setup-code (- stack-frame-size stack-setup-pre)))
((and (integerp optp-location)
(= optp-location (1+ stack-setup-pre)))
(append `((:pushl :edx))
(make-stack-setup-code (- stack-frame-size stack-setup-pre 1))))
((integerp optp-location)
(append (make-stack-setup-code (- stack-frame-size stack-setup-pre))
`((:movl :edx (:ebp ,(stack-frame-offset optp-location))))))
(t (error "Can't deal with optional-p at ~S, after (~S ~S)."
optp-location req-location opt-location)))
(flet ((make-lending (location lended-cons-position)
(etypecase req-location
(integer
`((:movl (:ebp ,(stack-frame-offset location)) :edx)
(:movl :edi (:ebp ,(stack-frame-offset lended-cons-position))) ; cdr
(:movl :edx (:ebp ,(stack-frame-offset (1+ lended-cons-position)))) ; car
(:leal (:ebp 1 ,(stack-frame-offset (1+ lended-cons-position)))
:edx)
(:movl :edx (:ebp ,(stack-frame-offset location))))))))
(append
(when (binding-lended-p req-binding)
(make-lending req-location (getf (binding-lending req-binding)
:stack-cons-location)))
(when (binding-lended-p opt-binding)
(make-lending opt-location (getf (binding-lending opt-binding)
:stack-cons-location)))
(when (and optp-binding (binding-lended-p optp-binding))
(make-lending optp-location (getf (binding-lending optp-binding)
:stack-cons-location)))))
resolved-code
(make-compiled-function-postlude funobj function-env
use-stack-frame-p)))))
(let ((optimized-function-code
(optimize-code function-code
:keep-labels (append (subseq (movitz-funobj-const-list funobj)
0 (movitz-funobj-num-jumpers funobj))
'(entry%1op entry%2op)))))
(assemble-funobj funobj optimized-function-code)))))
(defun complete-funobj-default (funobj)
(let ((code-specs
(loop for (numargs . function-env) in (function-envs funobj)
collecting
(let* ((frame-map (frame-map function-env))
(resolved-code (finalize-code (extended-code function-env) funobj frame-map))
(stack-frame-size (frame-map-size (frame-map function-env)))
(use-stack-frame-p (or (plusp stack-frame-size)
(tree-search resolved-code
'(:push :pop :ebp :esp :call :leave))
(some (lambda (x)
(and (not (equal '(:movl (:ebp -4) :esi) x))
(tree-search x ':esi)))
resolved-code))))
(multiple-value-bind (prelude-code have-normalized-ecx-p)
(make-compiled-function-prelude stack-frame-size function-env use-stack-frame-p
(need-normalized-ecx-p function-env) frame-map
:do-check-stack-p (or (<= 32 stack-frame-size)
(tree-search resolved-code
'(:call))))
(let ((function-code
(install-arg-cmp (append prelude-code
resolved-code
(make-compiled-function-postlude funobj function-env
use-stack-frame-p))
have-normalized-ecx-p)))
(let ((optimized-function-code
(optimize-code function-code
:keep-labels (append
(subseq (movitz-funobj-const-list funobj)
0 (movitz-funobj-num-jumpers funobj))
'(entry%1op
entry%2op
entry%3op)))))
(cons numargs optimized-function-code))))))))
(let ((code1 (cdr (assoc 1 code-specs)))
(code2 (cdr (assoc 2 code-specs)))
(code3 (cdr (assoc 3 code-specs)))
(codet (cdr (assoc 'muerte.cl::t code-specs))))
(assert codet () "A default numargs-case is required.")
;; (format t "codet:~{~&~A~}" codet)
(let ((combined-code
(delete 'start-stack-frame-setup
(append
(when code1
`((:cmpb 1 :cl)
(:jne 'not-one-arg)
,@(unless (find 'entry%1op code1)
'(entry%1op (:movb 1 :cl)))
,@code1
not-one-arg))
(when code2
`((:cmpb 2 :cl)
(:jne 'not-two-args)
,@(unless (find 'entry%2op code2)
'(entry%2op (:movb 2 :cl)))
,@code2
not-two-args))
(when code3
`((:cmpb 3 :cl)
(:jne 'not-three-args)
,@(unless (find 'entry%3op code3)
'(entry%3op (:movb 3 :cl)))
,@code3