git: 9front

Info  •  Files  •  Log  •  Branches

cc: reuse memory for Typetab by using allocn()

Using malloc() and free() wont free any memory
with the hunk allocator. Just make the Typetab
static (in signature()) to reuse the memory.

--- a/sys/src/cmd/cc/dcl.c

+++ b/sys/src/cmd/cc/dcl.c

@@ -1071,9 +1071,8 @@

 }

 typedef struct Typetab Typetab;

-

 struct Typetab{

-	int n;

+	int m, n;

 	Type **a;

 };

@@ -1080,23 +1079,19 @@

 static int

 sigind(Type *t, Typetab *tt)

 {

-	int n;

-	Type **a, **na, **p, **e;

+	Type **p, **e;

-	n = tt->n;

-	a = tt->a;

-	e = a+n;

 	/* linear search seems ok */

-	for(p = a ; p < e; p++)

+	e = tt->a+tt->n;

+	for(p = tt->a; p < e; p++){

 		if(sametype(*p, t))

-			return p-a;

-	if((n&15) == 0){

-		na = malloc((n+16)*sizeof(Type*));

-		memmove(na, a, n*sizeof(Type*));

-		free(a);

-		a = tt->a = na;

+			return p - tt->a;

 	}

-	a[tt->n++] = t;

+	if(tt->n == tt->m){

+		tt->a = allocn(tt->a, tt->n*sizeof(Type*), 16*sizeof(Type*));

+		tt->m += 16;

+	}

+	tt->a[tt->n++] = t;

 	return -1;

 }

@@ -1141,14 +1136,10 @@

 ulong

 signature(Type *t)

 {

-	ulong s;

-	Typetab tt;

+	static Typetab tt;

-	tt.n = 0;

-	tt.a = nil;

-	s = signat(t, &tt);

-	free(tt.a);

-	return s;

+	tt.n = 0;	/* reset table */

+	return signat(t, &tt);

 }

 ulong

-- 

⑨