X-Git-Url: https://git.distorted.org.uk/~mdw/sod/blobdiff_plain/1d8cc67a3f4ded443f5efc673a616883cbae9c50..1344e1f9c923a4d6602d64a33da175f48c7b7b64:/src/codegen-proto.lisp?ds=sidebyside diff --git a/src/codegen-proto.lisp b/src/codegen-proto.lisp index 4b38521..571f0b0 100644 --- a/src/codegen-proto.lisp +++ b/src/codegen-proto.lisp @@ -49,7 +49,7 @@ ;; Root class. -(export 'temporary-name) +(export '(temporary-name temp-tag)) (defclass temporary-name () ((tag :initarg :tag :reader temp-tag)) (:documentation @@ -62,10 +62,10 @@ This is automatically reset to zero before the output functions are invoked to write a file. This way, we can ensure that the same output - file is always produced from the same input." - ;; FIXME: this is currently a lie. Need some protocol to ensure that this - ;; happens. -) + file is always produced from the same input.") + +(define-clear-the-decks reset-codegen-index + (setf *temporary-index* 0)) ;; Important temporary names. @@ -74,6 +74,8 @@ (make-instance 'temporary-name :tag "sod__ap")) (defparameter *sod-master-ap* (make-instance 'temporary-name :tag "sod__master_ap")) +(defparameter *sod-tmp-ap* + (make-instance 'temporary-name :tag "sod__tmp_ap")) ;;;-------------------------------------------------------------------------- ;;; Instructions. @@ -86,9 +88,9 @@ "A base class for instructions. An `instruction' is anything which might be useful to string into a code - generator. Both statements and expressions map can be represented by - trees of instructions. The `definst' macro is a convenient way of - defining new instructions. + generator. Both statements and expressions can be represented by trees of + instructions. The `definst' macro is a convenient way of defining new + instructions. The only important protocol for instructions is output, which is achieved by calling `print-object' with `*print-escape*' nil. @@ -108,14 +110,19 @@ This isn't intended to be a particularly rigorous definition. Its purpose is to allow code generators to make decisions about inlining or calling code fairly simply.") - (:method (inst) + (:method ((inst t)) + (declare (ignore inst)) + 1) + (:method ((inst null)) (declare (ignore inst)) - 1)) + 1) + (:method ((inst list)) + (reduce #'+ inst :key #'inst-metric))) ;; Instruction definition. (export 'definst) -(defmacro definst (code (streamvar) args &body body) +(defmacro definst (code (streamvar &key export) args &body body) "Define an instruction type and describe how to output it. An `inst' can represent any structured piece of output syntax: a @@ -133,10 +140,14 @@ * A print method, which prints a diagnostic dump if `*print-escape*' is set, or invokes the BODY (with STREAMVAR bound to the output stream) otherwise. The BODY is expected to produce target code at this - point." + point. + + If EXPORT is non-nil, then export the `CODE-inst' and `make-CODE-inst' + symbols." (let ((inst-var (gensym "INST")) (class-name (symbolicate code '-inst)) + (constructor-name (symbolicate 'make- code '-inst)) (keys (mapcar (lambda (arg) (intern (symbol-name arg) :keyword)) args))) `(progn @@ -144,7 +155,7 @@ ,(mapcar (lambda (arg key) `(,arg :initarg ,key :reader ,(symbolicate 'inst- arg))) args keys)) - (defun ,(symbolicate 'make- code '-inst) (,@args) + (defun ,constructor-name (,@args) (make-instance ',class-name ,@(mappend #'list keys args))) (defmethod inst-metric ((,inst-var ,class-name)) (with-slots (,@args) ,inst-var @@ -155,30 +166,33 @@ (print-unreadable-object (,inst-var ,streamvar :type t) (format stream "~@<~@{~S ~@_~S~^ ~_~}~:>" ,@(mappend #'list keys args))) - (progn ,@body))))))) + (progn ,@body)))) + ,@(and export `((export '(,class-name ,constructor-name)))) + ',code))) ;; Important instruction classes. -(export '(block-inst make-block-inst var-inst make-var-inst - function-inst make-function-inst set-inst make-set-inst - return-inst make-return-inst expr-inst make-expr-inst - inst-decls inst-body inst-name inst-type inst-init inst-var - inst-expr)) - -(definst var (stream) (name type init) +(definst var (stream :export t) (name type init) (pprint-c-type type stream name) (when init - (format stream " = ~A" init))) -(definst set (stream) (var expr) + (format stream " = ~A" init)) + (write-char #\; stream)) +(definst set (stream :export t) (var expr) (format stream "~@<~A = ~@_~2I~A;~:>" var expr)) -(definst return (stream) (expr) +(definst update (stream :export t) (var op expr) + (format stream "~@<~A ~A= ~@_~2I~A;~:>" var op expr)) +(definst return (stream :export t) (expr) (format stream "return~@[ (~A)~];" expr)) -(definst expr (stream) (expr) +(definst break (stream :export t) () + (format stream "break;")) +(definst continue (stream :export t) () + (format stream "continue;")) +(definst expr (stream :export t) (expr) (format stream "~A;" expr)) -(definst block (stream) (decls body) - (format stream "{~:@_~@< ~2I~@[~{~A;~:@_~}~:@_~]~{~A~^~:@_~}~:>~:@_}" +(definst block (stream :export t) (decls body) + (format stream "{~:@_~@< ~2I~@[~{~A~:@_~}~:@_~]~{~A~^~:@_~}~:>~:@_}" decls body)) -(definst function (stream) (name type body) +(definst function (stream :export t) (name type body) (pprint-logical-block (stream nil) (princ "static " stream) (pprint-c-type type stream name) @@ -249,6 +263,14 @@ (:method (codegen insts) (dolist (inst insts) (emit-inst codegen inst)))) +(export '(emit-decl emit-decls)) +(defgeneric emit-decl (codegen inst) + (:documentation + "Add INST to the end of CODEGEN's list of declarations.")) +(defgeneric emit-decls (codegen insts) + (:documentation + "Add a list of INSTS to the end of CODEGEN's list of declarations.")) + (export 'codegen-push) (defgeneric codegen-push (codegen) (:documentation @@ -316,7 +338,7 @@ "Evaluate BODY with VAR bound to a temporary variable name. During BODY, VAR will be marked in-use; when BODY ends, VAR will be marked - available for re-use." + available for re-use." `(let ((,var (temporary-var ,codegen ,type))) (unwind-protect (progn ,@body)