runtime/gyehoek.c

@@ -1,12 +1,13 @@
 #include <stdio.h>
 #include <gc.h>
+#include <string.h>
 #include "gyehoek.h"
 
 
 
 const long scm_tc3_cons = 0;
 
-const long scm_tc7_obarray = 0x55;
+const long scm_tc7_weak_set = 0x55;
 const long scm_tc7_symbol = 0x05;
 const long scm_tc7_string = 0x15;
 
@@ -17,9 +18,17 @@ SCM scm_newline () {
   return SCM_PACK(NULL);
 }
 
+size_t scm_c_string_length (SCM str) {
+  return SCM_CELL_WORD (str, 1);
+}
+
+const char *scm_c_string_chars (SCM str) {
+  return (const char *) SCM_UNPACK_POINTER (SCM_CELL_OBJECT (str, 2));
+}
+
 static void scm_write_string (SCM x) {
-  const size_t len = SCM_CELL_WORD (x, 1);
-  const char *s = (const char *) SCM_UNPACK_POINTER (SCM_CELL_OBJECT (x, 2));
+  const size_t len = scm_c_string_length (x);
+  const char *s = scm_c_string_chars (x);
   /* FIXME: this is a very naïve implementation with no escaping. */
   printf ("some unrelated unicode lol: %s\n", "왜 하냐??");
   printf ("\"%.*s\"", (int) len, s);
@@ -60,10 +69,41 @@ SCM scm_from_utf8_string (const char *str, size_t len) {
   SCM r = scm_words (scm_tc7_string, 3);
   SCM_SET_CELL_WORD (r, 1, len);
   SCM_SET_CELL_WORD (r, 2, str);
-  printf ("str: %p\n", str);
   return r;
 }
 
+SCM scm_from_cstring (const char *str) {
+  return scm_from_utf8_string (str, strlen (str));
+}
+
+unsigned long scm_c_hash (SCM str) {
+  const unsigned long offset_basis = 0xcbf29ce484222325;
+  const unsigned long prime = 0x100000001b3;
+  const size_t len = scm_c_string_length (str);
+  const char *bytes = scm_c_string_chars (str);
+  unsigned long hash = offset_basis;
+
+  for (const char *c = bytes; c < bytes + len; c++) {
+    hash ^= *c;
+    hash *= prime;
+  }
+
+  // mask off MSB, since we use it to mark tombstones in weak-set.c.
+  /* hash &= 0x7fffffffffffffff; */
+
+  // shift off MSB, since we use it to mark tombstones in weak-set.c.
+  /* hash >>= 1; */
+
+  /* ensure hash is non-zero */
+  hash |= hash == 0;
+
+  return hash;
+}
+
+SCM scm_str_to_symbol (SCM str) {
+  
+}
+
 SCM scm_from_utf8_symbol (const char *s, size_t len) {
 }
 
@@ -73,3 +113,10 @@ SCM scm_cons (SCM car, SCM cdr) {
   r[1] = SCM_UNPACK (cdr);
   return SCM_PACK (r);
 }
+
+SCM scm_make_symbol (SCM name, unsigned long hash) {
+  SCM r = scm_words(scm_tc7_symbol, 3);
+  SCM_SET_CELL_WORD (r, 1, hash);
+  SCM_SET_CELL_OBJECT (r, 2, name);
+  return r;
+}

runtime/gyehoek.h

@@ -32,7 +32,7 @@ typedef union SCM { struct { scm_t_bits n; } n; } SCM;
    : ((x) >> (y)))
 #endif
 
-#define SCM_MAKE_SMALL_INT(x) (SCM_SRS ((SCM_PACK (x)), 2) + 2)
+#define SCM_MAKE_SMALL_INT(x) (SCM_SRS ((long)(x), 2) + 2)
 #define SCM_GET_SMALL_INT(x) (SCM_UNPACK (x) >> 2)
 
 /* Checking if a SCM variable holds a pair (for historical reasons, in
@@ -76,26 +76,32 @@ SCM scm_cdr (SCM x);
   (SCM_NIMP (x) && type (x) == (tag))
 #define SCM_HAS_TYP7(x, tag)    (SCM_HAS_HEAP_TYPE (x, SCM_TYP7, tag))
 
-extern const long scm_tc7_obarray;
+extern const long scm_tc7_weak_set;
 extern const long scm_tc7_symbol;
 extern const long scm_tc7_string;
 
-
-
 #define SCM_STRINGP(x) (SCM_TYP7 (x) == scm_tc7_string)
+#define SCM_SYMBOLP(x) (SCM_TYP7 (x) == scm_tc7_symbol)
 
 
 
+unsigned long scm_c_hash (SCM str);
+
 SCM scm_words (scm_t_bits word_0, uint32_t n_words);
 
 /* Construct a Scheme string. */
 SCM scm_from_utf8_string (const char *str, size_t len);
+SCM scm_from_cstring (const char *str);
 
 /* Intern a symbol with a UTF-8 string name. */
 SCM scm_from_utf8_symbol (const char *s, size_t len);
 
 
 
+SCM scm_make_symbol (SCM name, unsigned long hash);
+
+
+
 SCM scm_write (SCM);
 
 

runtime/obarray.c

@@ -1,24 +0,0 @@
-#include "gyehoek.h"
-#include "obarray.h"
-
-typedef struct {
-  unsigned long hash;
-  scm_t_bits key;
-} scm_t_weak_entry;
-
-struct weak_entry_data {
-  scm_t_weak_entry *in;
-  scm_t_weak_entry *out;
-};
-
-typedef struct {
-  scm_t_weak_entry *entries;    /* the data */
-  scm_i_pthread_mutex_t lock;   /* the lock */
-  unsigned long size;    	/* total number of slots. */
-  unsigned long n_items;	/* number of items in set */
-  unsigned long lower;		/* when to shrink */
-  unsigned long upper;		/* when to grow */
-  int size_index;		/* index into hashset_size */
-  int min_size_index;		/* minimum size_index */
-} scm_t_weak_set;
-

runtime/obarray.h

@@ -1,8 +0,0 @@
-#ifndef OBARRAY_H
-#define OBARRAY_H
-
-#define SCM_OBARRAY_P(x) (SCM_HAS_TYP7 (x, scm_tc7_weak_set))
-
-SCM scm_obarray_insert ()
-
-#endif /* OBARRAY_H */

runtime/weak-set.c

@@ -0,0 +1,121 @@
+#include <gc.h>
+#include <gc/gc.h>
+#include <string.h>
+#include "gyehoek.h"
+#include "weak-set.h"
+
+typedef struct {
+  unsigned long hash;
+  scm_t_bits key;
+} scm_t_weak_entry;
+
+/* struct weak_entry_data { */
+/*   scm_t_weak_entry *in; */
+/*   scm_t_weak_entry *out; */
+/* }; */
+
+typedef struct {
+  scm_t_weak_entry *entries;    /* the data */
+  unsigned long size;    	/* total number of slots. */
+  unsigned long n_items;	/* number of items in set */
+  unsigned long lower;		/* when to shrink */
+  unsigned long upper;		/* when to grow */
+  int size_index;		/* index into hashset_size */
+  int min_size_index;		/* minimum size_index */
+} scm_t_weak_set;
+
+/* Growing or shrinking is triggered when the load factor
+ *
+ *   L = N / S    (N: number of items in set, S: bucket vector length)
+ *
+ * passes an upper limit of 0.9 or a lower limit of 0.2.
+ *
+ * The implementation stores the upper and lower number of items which
+ * trigger a resize in the hashset object.
+ *
+ * Possible hash set sizes (primes) are stored in the array
+ * hashset_size.
+ */
+
+static unsigned long hashset_size[] = {
+  31, 61, 113, 223, 443, 883, 1759, 3517, 7027, 14051, 28099, 56197, 112363,
+  224717, 449419, 898823, 1797641, 3595271, 7190537, 14381041, 28762081,
+  57524111, 115048217, 230096423
+};
+
+#define HASHSET_SIZE_N (sizeof(hashset_size)/sizeof(unsigned long))
+
+SCM scm_c_make_weak_set (unsigned long k) {
+  scm_t_weak_set *set = GC_malloc (sizeof (scm_t_weak_set));
+
+  /* i ripped this from guile and i'm not sure what it's for ^w^. */
+  int i = 0, n = k ? k : 31;
+  while (i + 1 < HASHSET_SIZE_N && n > hashset_size[i])
+    ++i;
+  n = hashset_size[i];
+
+  set->entries = GC_malloc_atomic (n * sizeof(scm_t_weak_entry));
+  memset (set->entries, 0, n * sizeof(scm_t_weak_entry));
+  set->n_items = 0;
+  set->size = n;
+  set->lower = 0;
+  set->upper = 9 * n / 10;
+  set->size_index = i;
+  set->min_size_index = i;
+
+  SCM r = scm_words (scm_tc7_weak_set, 2);
+  SCM_SET_CELL_WORD (r, 1, set);
+  return r;
+}
+
+static int
+apply_pred (scm_t_weak_entry *entry, scm_t_set_predicate_fn pred
+            , void *closure) {
+  scm_t_weak_entry copy;
+  memcpy (&copy, entry, sizeof (scm_t_weak_entry));
+  return pred (SCM_PACK (copy.key), closure);
+}
+
+static SCM
+find_bucket (scm_t_weak_set *set, unsigned long hash,
+             SCM key, scm_t_set_predicate_fn pred, void *closure,
+             unsigned long p) {
+  const unsigned long other_hash = set->entries[p].hash;
+  if (other_hash == 0) {
+    set->entries[p].hash = hash;
+    set->entries[p].key = SCM_UNPACK (key);
+    set->n_items++;
+    return key;
+  } else if (hash == other_hash
+             // guile passes a copy.. is this important for weak
+             // references...
+             && pred (SCM_PACK (set->entries[p].key), closure)) {
+    return SCM_PACK (set->entries[p].key);
+  } else {
+    return find_bucket (set, hash, key, pred, closure,
+                        (p + 1) % set->size);
+  }
+}
+
+#define SCM_WEAK_SET(x) ((scm_t_weak_set *) SCM_CELL_WORD (x, 1))
+
+SCM scm_c_weak_set_insert (SCM set, unsigned long hash,
+                           SCM key, scm_t_set_predicate_fn pred,
+                           void* closure) {
+  scm_t_weak_set *s = SCM_WEAK_SET (set);
+  unsigned long size = s->size;
+
+  if (s->n_items > s->upper) {
+    /* resize */
+  }
+
+  return find_bucket (s, hash, key, pred, closure, hash % size);
+}
+
+SCM scm_c_weak_set_lookup (scm_t_weak_set *set, unsigned long hash, SCM dflt) {
+
+}
+
+unsigned long weak_set_count (SCM set) {
+  return (SCM_WEAK_SET (set))->n_items;
+}

runtime/weak-set.h

@@ -0,0 +1,20 @@
+#ifndef WEAK_SET_H
+#define WEAK_SET_H
+
+#include "gyehoek.h"
+
+#define SCM_WEAK_SET_P(x) (SCM_HAS_TYP7 (x, scm_tc7_weak_set))
+
+/* Function that returns nonzero if the given object is the one we are
+   looking for.  */
+typedef int (*scm_t_set_predicate_fn) (SCM obj, void *closure);
+
+SCM scm_c_make_weak_set (unsigned long k);
+
+SCM scm_c_weak_set_insert (SCM set, unsigned long hash,
+                           SCM key, scm_t_set_predicate_fn pred,
+                           void* closure);
+
+unsigned long weak_set_count (SCM set);
+
+#endif /* WEAK_SET_H */