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(in-package #:cmamut)
; Ideas:
; Generate code that creates a package and puts all definitions there.
; To avoid collisions the created package shouldn't import any symbols.
; Only define functions from the target library, but get all other definitions.
; To reduce amount of names being generated, resolve all types to their base counterparts
; Separate generation, preprocessing and type resolution phases
; Preprocessing phase should handle enums, structs and unions
; Basic types are handled by type resolution phase
; Can put an error to default case in cook type to enforce type resolution
; TODO: Get constants from macro file generated by c2ffi -M
(defvar enum-references (make-hash-table :test #'equal :size 256))
; TODO: Use c2ffi to extract the spec.json using the header file as parameter
(defun get-raw-spec ()
(json:from-file "~/common-lisp/cmamut/spec.json"))
(defun cook-type (raw-type)
(let ((tag (gethash "tag" raw-type)))
(cond ((string= tag ":void")
'sb-alien:void)
((string= tag ":function-pointer")
'sb-alien:function)
((string= tag ":pointer")
(let ((pointed-type (gethash "type" raw-type)))
(cond ((string= (gethash "tag" pointed-type) ":char")
'sb-alien:c-string)
((string= (gethash "tag" pointed-type) ":void")
(list 'sb-alien:* t))
(t (list 'sb-alien:* (cook-type pointed-type))))))
((string= tag ":float")
'sb-alien:float)
((string= tag ":double")
'sb-alien:double)
((string= tag ":unsigned-char")
'sb-alien:unsigned-char)
((string= tag ":unsigned-short")
'sb-alien:unsigned-short)
((string= tag ":unsigned-int")
'sb-alien:unsigned-int)
((string= tag ":unsigned-long")
'sb-alien:unsigned-long)
((or (string= tag ":char") (string= tag ":signed-char"))
'sb-alien:char)
((or (string= tag ":short") (string= tag ":signed-short"))
'sb-alien:short)
((or (string= tag ":int") (string= tag ":signed-int"))
'sb-alien:int)
((or (string= tag ":long") (string= tag ":signed-long"))
'sb-alien:long)
((string= tag ":array")
(list 'sb-alien:array
(cook-type (gethash "type" raw-type))
(gethash "size" raw-type)))
((string= tag ":struct")
(list 'sb-alien:struct (intern (gethash "name" raw-type))))
((string= tag ":union")
(list 'sb-alien:union (intern (gethash "name" raw-type))))
((string= tag "struct")
(cook-struct raw-type))
((string= tag "union")
(cook-union raw-type))
(t tag)))) ;TODO: Add type resolution
(defun cook-function (raw-function &optional name-transformer)
(let ((raw-params (gethash "parameters" raw-function))
(cooked-params (queue:new)))
(dotimes (j (length raw-params))
(queue:add cooked-params
(list (intern (string-upcase (gethash "name" (aref raw-params j))))
(cook-type (gethash "type" (aref raw-params j))))))
`(sb-alien:define-alien-routine
,(let ((function-name (gethash "name" raw-function)))
(if name-transformer
(list function-name (funcall name-transformer function-name))
function-name))
,(cook-type (gethash "return-type" raw-function))
,@(queue:to-list cooked-params))))
(defun cook-struct (raw-struct)
(let ((raw-fields (gethash "fields" raw-struct))
(cooked-fields (queue:new)))
(dotimes (j (length raw-fields))
(queue:add cooked-fields
(list (intern (string-upcase (gethash "name" (aref raw-fields j))))
(cook-type (gethash "type" (aref raw-fields j))))))
`(sb-alien:struct
,(when (> (length (gethash "name" raw-struct)) 0)
(intern (gethash "name" raw-struct)))
,@(queue:to-list cooked-fields))))
(defun cook-union (raw-union)
(let ((raw-fields (gethash "fields" raw-union))
(cooked-fields (queue:new)))
(dotimes (j (length raw-fields))
(queue:add cooked-fields
(list (intern (string-upcase (gethash "name" (aref raw-fields j))))
(cook-type (gethash "type" (aref raw-fields j))))))
`(sb-alien:union
,(when (> (length (gethash "name" raw-union)) 0)
(intern (gethash "name" raw-union)))
,@(queue:to-list cooked-fields))))
(defun cook-enum (raw-enum)
(let ((name (gethash (gethash "id" raw-enum) enum-references))
(raw-fields (gethash "fields" raw-enum))
(cooked-fields (queue:new)))
(dotimes (j (length raw-fields))
(queue:add cooked-fields
(list (intern (string-upcase (gethash "name" (aref raw-fields j))))
(gethash "value" (aref raw-fields j)))))
`(sb-alien:define-alien-type
,name
(sb-alien:enum
nil
,@(queue:to-list cooked-fields)))))
; If the enum table population gets done at an earlier stage and all typedefs get flattened, there would be no need of having codegen for typedefs.
(defun cook-typedef (raw-typedef)
(let* ((base-type (gethash "type" raw-typedef))
(new-name (gethash "name" raw-typedef)))
(if (string= (gethash "tag" base-type) ":enum")
(progn (setf (gethash (gethash "id" base-type) enum-references) new-name) nil)
`(sb-alien:define-alien-type
,new-name
,(cook-type base-type)))))
; Generates a table for type resolution.
; Typedefs get "flattened" so that resolving is just a lookup.
(defun flatten-typedefs (raw-typedefs)
(let ((type-associations (make-hash-table :test #'equal :size 256)))
(dolist (i raw-typedefs)
(setf (gethash (gethash "name" i) type-associations) (gethash "type" i)))
(labels ((flatten-typedef
(k v)
(let ((new-v (gethash (gethash "tag" v) type-associations)))
(when new-v
(setf (gethash k type-associations) new-v)
(flatten-typedef k new-v)))))
(maphash #'flatten-typedef type-associations))
type-associations))
(defstruct spec
functions
typedefs
structs
unions
enums)
; This is done so we can separate definition types into stages when generating code.
; Some crazy shit is happening when processing typedefs so we can identify nested composite types and put them into the right buckets.
; What's left on the typedefs are references to said composite types.
; This allows for a comfier type resolution stage by letting us flatten typedefs.
; Composite types cause problems because they can't be redefined.
(defun classify-definitions (raw-spec)
(let ((spec (make-spec)))
(dotimes (i (length raw-spec))
(classify-definition (aref raw-spec i) spec))
spec))
(defun classify-definition (def spec)
(let ((tag (gethash "tag" def)))
(cond ((string= tag "function")
(push def (spec-functions spec)))
((or (string= tag "typedef")
(string= tag ":array")
(string= tag ":pointer"))
(let* ((internal-type (gethash "type" def))
(internal-tag (gethash "tag" internal-type)))
(cond ((or (string= internal-tag "struct")
(string= internal-tag "union"))
(when (string= (gethash "name" internal-type) "")
(setf (gethash "name" internal-type) (gethash "name" def)))
(classify-definition internal-type spec)
(setf (gethash "type" def)
(json:from-string
(format nil
"{ \"tag\": \":~a\", \"name\": ~s }"
(gethash "tag" internal-type)
(gethash "name" internal-type)))))
((or (string= internal-tag ":array")
(string= internal-tag ":pointer"))
(classify-definition internal-type spec)))
(when (string= tag "typedef")
(push def (spec-typedefs spec)))))
((string= tag "struct")
(push def (spec-structs spec)))
((string= tag "enum")
(push def (spec-enums spec)))
((string= tag "union")
(push def (spec-unions spec)))))
spec)
(defun codegen (spec)
(clrhash enum-references)
; typedefs must be generated first to build the reference table
(setf (spec-typedefs spec)
(remove nil (mapcar #'cook-typedef (filter-base-types (spec-typedefs spec)))))
(setf (spec-enums spec) (mapcar #'cook-enum (spec-enums spec)))
(setf (spec-structs spec)
(mapcar (lambda (x)
`(sb-alien:define-alien-type nil ,(cook-struct x)))
(spec-structs spec)))
(setf (spec-unions spec)
(mapcar (lambda (x)
`(sb-alien:define-alien-type nil ,(cook-union x)))
(spec-unions spec)))
(setf (spec-functions spec) (mapcar #'cook-function (spec-functions spec)))
spec)
(defun to-json-file (code filename)
(with-open-file (f filename
:direction :output
:if-exists :supersede
:if-does-not-exist :create)
(let ((*print-length* nil)
(*print-level* nil))
(format f "~{~a~&~}" (mapcar #'json:to-string code)))))
(defun to-file (code filename)
(with-open-file (f filename
:direction :output
:if-exists :supersede
:if-does-not-exist :create)
(let ((*print-length* nil)
(*print-level* nil))
(format f "~{~s~&~}" code))))
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