shithub: scc

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Add void pointers

These pointers can be mixed with pointers of any type.

--- a/cc.h

+++ b/cc.h

@@ -113,7 +113,7 @@

 extern Type *typename(void);

-extern Type *voidtype, *booltype,

+extern Type *voidtype, *pvoidtype, *booltype,

 	*uchartype,   *chartype,

 	*uinttype,    *inttype,

 	*ushortype,   *shortype,

--- a/expr.c

+++ b/expr.c

@@ -117,6 +117,9 @@

 		switch (t2) {

 		case ARY: case FTN:

 			np = addr2ptr(np);

+		case PTR:

+			if (tp1 != pvoidtype && tp2 != pvoidtype)

+				return NULL;

 			/* TODO:

 			 * we assume conversion between pointers

 			 * do not need any operation, but due to

--- a/types.c

+++ b/types.c

@@ -13,6 +13,10 @@

 		.op = VOID,

 		.letter = 'W'

 	},

+	*pvoidtype = &(Type) {

+		.op = PTR,

+		.letter = 'R'

+	},

 	*booltype = &(Type) {

 		.op = INT,

 		.letter = 'B',

@@ -139,6 +143,8 @@

 	register Type *bp;

 	char letter;

+	if (op == PTR && tp == voidtype)

+		return pvoidtype;

 	t = (op  ^  (uint8_t) ((unsigned short) tp >> 3))

 	         & NR_TYPE_HASH-1;

 	tbl = &typetab[t];

-- 

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