src/codegen-proto.lisp: New instruction types `cond' and `for',

[sod] / src / codegen-proto.lisp

diff --git a/src/codegen-proto.lisp b/src/codegen-proto.lisp
index 4bfaeca68a8c8df18112ae41a52342e5129c5d85..e663fb566b9a2d4252785d4be9d691421785fa04 100644 (file)
--- a/src/codegen-proto.lisp
+++ b/src/codegen-proto.lisp
@@ -67,6 +67,9 @@ (defparameter *sod-tmp-ap*
 (defparameter *sod-tmp-val*
   (make-instance 'temporary-name :tag "sod__t"))
 
+(export '*null-pointer*)
+(defparameter *null-pointer* "NULL")
+
 ;;;--------------------------------------------------------------------------
 ;;; Instructions.
 
@@ -207,6 +210,10 @@ (defmacro format-compound-statement
   `(format-compound-statement* ,stream ,child ,morep
                               (lambda (,stream) ,@body)))
 
+(export 'format-banner-comment)
+(defun format-banner-comment (stream control &rest args)
+  (format stream "~@</~@<* ~@;~?~:>~_ */~:>" control args))
+
 ;; Important instruction classes.
 
 ;; HACK: Some of the slot names we'd like to use are external symbols in our
@@ -219,8 +226,12 @@ (definst var (stream :export t) (name #1=#:type &optional init)
     (format stream " = ~A" init))
   (write-char #\; stream))
 
-(definst function (stream :export t) (name #1=#:type body)
+(definst function (stream :export t)
+    (name #1=#:type body &optional #2=#:banner &rest banner-args)
   (pprint-logical-block (stream nil)
+    (when #2#
+      (apply #'format-banner-comment stream #2# banner-args)
+      (pprint-newline :mandatory stream))
     (princ "static " stream)
     (pprint-c-type #1# stream name)
     (format stream "~:@_~A~:@_~:@_" body)))
@@ -236,6 +247,8 @@ (definst update (stream :export t) (var op #1=#:expr)
 ;; Special kinds of expressions.
 (definst call (stream :export t) (#1=#:func &rest args)
   (format stream "~A(~@<~{~A~^, ~_~}~:>)" #1# args))
+(definst cond (stream :export t) (#1=#:cond conseq alt)
+  (format stream "~@<~A ~2I~@_~@<? ~A ~_: ~A~:>~:>" #1# conseq alt))
 
 ;; Simple statements.
 (definst return (stream :export t) (#1=#:expr)
@@ -247,16 +260,58 @@ (definst continue (stream :export t) ()
 
 ;; Compound statements.
 
+(defvar *first-statement-p* t
+  "True if this is the first statement in a block.
+
+   This is used to communicate between `block-inst' and `banner-inst' so that
+   they get the formatting right between them.")
+
+(definst banner (stream :export t) (control &rest args)
+  (pprint-logical-block (stream nil)
+    (unless *first-statement-p* (pprint-newline :mandatory stream))
+    (apply #'format-banner-comment stream control args)))
+
+(export 'emit-banner)
+(defun emit-banner (codegen control &rest args)
+  (emit-inst codegen (apply #'make-banner-inst control args)))
+
 (definst block (stream :export t) (decls body)
-  (format stream "{~:@_~@<  ~2I~@[~{~A~:@_~}~:@_~]~{~A~^~:@_~}~:>~:@_}"
-         decls body))
+  (write-char #\{ stream)
+  (pprint-newline :mandatory stream)
+  (pprint-logical-block (stream nil)
+    (let ((newlinep nil))
+      (flet ((newline ()
+              (if newlinep
+                  (pprint-newline :mandatory stream)
+                  (setf newlinep t))))
+       (pprint-indent :block 2 stream)
+       (write-string "  " stream)
+       (when decls
+         (dolist (decl decls)
+           (newline)
+           (write decl :stream stream))
+         (when body (newline)))
+       (let ((*first-statement-p* t))
+         (dolist (inst body)
+           (newline)
+           (write inst :stream stream)
+           (setf *first-statement-p* nil))))))
+  (pprint-newline :mandatory stream)
+  (write-char #\} stream))
 
 (definst if (stream :export t) (#1=#:cond conseq &optional alt)
-  (format-compound-statement (stream conseq alt)
-    (format stream "if (~A)" #1#))
-  (when alt
-    (format-compound-statement (stream alt)
-      (write-string "else" stream))))
+  (let ((stmt "if"))
+    (loop (format-compound-statement (stream conseq (if alt t nil))
+           (format stream "~A (~A)" stmt #1#))
+         (typecase alt
+           (null (return))
+           (if-inst (setf stmt "else if"
+                          #1# (inst-cond alt)
+                          conseq (inst-conseq alt)
+                          alt (inst-alt alt)))
+           (t (format-compound-statement (stream alt)
+                (format stream "else"))
+              (return))))))
 
 (definst while (stream :export t) (#1=#:cond body)
   (format-compound-statement (stream body)
@@ -267,6 +322,11 @@ (definst do-while (stream :export t) (body #1=#:cond)
     (write-string "do" stream))
   (format stream "while (~A);" #1#))
 
+(definst for (stream :export t) (init #1=#:cond update body)
+  (format-compound-statement (stream body)
+    (format stream "for (~@<~@[~A~];~@[ ~_~A~];~@[ ~_~A~]~:>)"
+           init #1# update)))
+
 ;;;--------------------------------------------------------------------------
 ;;; Code generation.
 
@@ -339,13 +399,15 @@ (defgeneric temporary-var (codegen type)
    cleanup automatically."))
 
 (export 'codegen-build-function)
-(defun codegen-build-function (codegen name type vars insts)
+(defun codegen-build-function
+    (codegen name type vars insts &optional banner &rest banner-args)
   "Build a function and add it to CODEGEN's list.
 
    Returns the function's name."
   (codegen-add-function codegen
-                       (make-function-inst name type
-                                           (make-block-inst vars insts)))
+                       (apply #'make-function-inst name type
+                              (make-block-inst vars insts)
+                              banner banner-args))
   name)
 
 (export 'codegen-pop-block)
@@ -357,15 +419,17 @@ (defgeneric codegen-pop-block (codegen)
       (make-block-inst vars insts))))
 
 (export 'codegen-pop-function)
-(defgeneric codegen-pop-function (codegen name type)
+(defgeneric codegen-pop-function
+    (codegen name type &optional banner &rest banner-args)
   (:documentation
    "Makes a function out of the completed code in CODEGEN.
 
    The NAME can be any object you like.  The TYPE should be a function type
    object which includes argument names.  The return value is the NAME.")
-  (:method (codegen name type)
+  (:method (codegen name type &optional banner &rest banner-args)
     (multiple-value-bind (vars insts) (codegen-pop codegen)
-      (codegen-build-function codegen name type vars insts))))
+      (apply #'codegen-build-function codegen name type vars insts
+            banner banner-args))))
 
 (export 'with-temporary-var)
 (defmacro with-temporary-var ((codegen var type) &body body)