wingo pushed a commit to branch wip-whippet
in repository guile.

commit 0134abce741b90800d4cbf07bb75efb0f51bc04b
Author: Andy Wingo <wi...@pobox.com>
AuthorDate: Mon Jun 2 09:08:35 2025 +0200

    Move private bytevectors API to a separate header
    
    Also give bytevectors a private type (a struct).
    
    * libguile/bytevectors.h (SCM_BYTEVECTOR_HEADER_SIZE): Remove.
    (SCM_BYTEVECTOR_LENGTH):
    (SCM_BYTEVECTOR_CONTENTS): Proxy to the C accessors.
    (SCM_BYTEVECTOR_PARENT): Remove from public API.
    (SCM_BYTEVECTOR_P, SCM_VALIDATE_BYTEVECTOR): Make public.
    (scm_c_bytevector_contents): New function.
    * libguile/bytevectors-internal.h: New file.
    * libguile/Makefile.am (noinst_HEADERS): Add new file.
    
    * libguile/bytevectors.c:
    * libguile/array-handle.c:
    * libguile/arrays.c:
    * libguile/foreign.c:
    * libguile/goops.c:
    * libguile/init.c:
    * libguile/loader.c:
    * libguile/print.c:
    * libguile/r6rs-ports.c:
    * libguile/srfi-4.c:
    * libguile/strings.c: Adapt to use bytevectors-internal.h as needed, and
    sometimes to use the internal bytevector type.
---
 libguile/Makefile.am            |   1 +
 libguile/array-handle.c         |  40 +++---
 libguile/arrays.c               |   3 +-
 libguile/bytevectors-internal.h | 125 ++++++++++++++++
 libguile/bytevectors.c          | 308 ++++++++++++++++++----------------------
 libguile/bytevectors.h          |  70 ++-------
 libguile/foreign.c              |   3 +-
 libguile/goops.c                |   4 +-
 libguile/init.c                 |   2 +-
 libguile/loader.c               |   2 +-
 libguile/print.c                |   1 +
 libguile/r6rs-ports.c           |   5 +-
 libguile/srfi-4.c               |  21 ++-
 libguile/strings.c              |   3 +-
 14 files changed, 311 insertions(+), 277 deletions(-)

diff --git a/libguile/Makefile.am b/libguile/Makefile.am
index 8b5f7a238..ef1dc6970 100644
--- a/libguile/Makefile.am
+++ b/libguile/Makefile.am
@@ -525,6 +525,7 @@ noinst_HEADERS = custom-ports.h                             
        \
                  intrinsics.h                                  \
                  quicksort.i.c                                  \
                  atomics-internal.h                            \
+                 bytevectors-internal.h                                \
                  cache-internal.h                              \
                  gc-inline.h                                   \
                  gc-internal.h                                 \
diff --git a/libguile/array-handle.c b/libguile/array-handle.c
index e51e133bb..37eaab688 100644
--- a/libguile/array-handle.c
+++ b/libguile/array-handle.c
@@ -1,4 +1,4 @@
-/* Copyright 1995-1998,2000-2006,2009,2011,2013-2014,2018
+/* Copyright 1995-1998,2000-2006,2009,2011,2013-2014,2018,2025
      Free Software Foundation, Inc.
 
    This file is part of Guile.
@@ -30,6 +30,7 @@
 #include "boolean.h"
 #include "bitvectors.h"
 #include "bytevectors.h"
+#include "bytevectors-internal.h"
 #include "list.h"
 #include "numbers.h"
 #include "pairs.h"
@@ -78,11 +79,10 @@ bytevector_c32_ref (SCM bv, size_t pos)
   char *c_bv;
   float real, imag;
 
-  if (!SCM_BYTEVECTOR_P (bv))
-    abort ();
-  c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv);
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);
+  c_bv = (char *) bvp->contents;
   pos *= 2 * sizeof (float);
-  if (pos + 2 * sizeof (float) - 1 >= SCM_BYTEVECTOR_LENGTH (bv))
+  if (pos + 2 * sizeof (float) - 1 >= bvp->length)
     abort ();
 
   memcpy (&real, &c_bv[pos], sizeof (float));
@@ -96,11 +96,10 @@ bytevector_c64_ref (SCM bv, size_t pos)
   char *c_bv;
   double real, imag;
 
-  if (!SCM_BYTEVECTOR_P (bv))
-    abort ();
-  c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv);
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);
+  c_bv = (char *) bvp->contents;
   pos *= 2 * sizeof (double);
-  if (pos + 2 * sizeof (double) - 1 >= SCM_BYTEVECTOR_LENGTH (bv))
+  if (pos + 2 * sizeof (double) - 1 >= bvp->length)
     abort ();
 
   memcpy (&real, &c_bv[pos], sizeof (double));
@@ -114,11 +113,10 @@ bytevector_c32_set (SCM bv, size_t pos, SCM val)
   char *c_bv;
   float real, imag;
 
-  if (!SCM_BYTEVECTOR_P (bv))
-    abort ();
-  c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv);
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);
+  c_bv = (char *) bvp->contents;
   pos *= 2 * sizeof (float);
-  if (pos + 2 * sizeof (float) - 1 >= SCM_BYTEVECTOR_LENGTH (bv))
+  if (pos + 2 * sizeof (float) - 1 >= bvp->length)
     abort ();
 
   real = scm_c_real_part (val);
@@ -133,11 +131,10 @@ bytevector_c64_set (SCM bv, size_t pos, SCM val)
   char *c_bv;
   double real, imag;
 
-  if (!SCM_BYTEVECTOR_P (bv))
-    abort ();
-  c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv);
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);
+  c_bv = (char *) bvp->contents;
   pos *= 2 * sizeof (double);
-  if (pos + 2 * sizeof (double) - 1 >= SCM_BYTEVECTOR_LENGTH (bv))
+  if (pos + 2 * sizeof (double) - 1 >= bvp->length)
     abort ();
 
   real = scm_c_real_part (val);
@@ -222,8 +219,9 @@ scm_array_get_handle (SCM array, scm_t_array_handle *h)
         scm_t_vector_ref vref;
         scm_t_vector_set vset;
 
-        element_type = SCM_BYTEVECTOR_ELEMENT_TYPE (array);
-        length = SCM_BYTEVECTOR_TYPED_LENGTH (array);
+        struct scm_bytevector *bv = scm_to_bytevector (array);
+        element_type = scm_bytevector_element_type (bv);
+        length = scm_bytevector_typed_length (bv);
 
         switch (element_type)
           {
@@ -257,8 +255,8 @@ scm_array_get_handle (SCM array, scm_t_array_handle *h)
           }
 
         initialize_vector_handle (h, length, element_type, vref, vset,
-                                  SCM_BYTEVECTOR_CONTENTS (array),
-                                  SCM_MUTABLE_BYTEVECTOR_P (array));
+                                  bv->contents,
+                                  !scm_bytevector_is_immutable (bv));
       }
       break;
     case scm_tc7_array:
diff --git a/libguile/arrays.c b/libguile/arrays.c
index 25391d4c3..cf9ec8c62 100644
--- a/libguile/arrays.c
+++ b/libguile/arrays.c
@@ -1,4 +1,4 @@
-/* Copyright 1995-1998,2000-2006,2009-2015,2018, 2021
+/* Copyright 1995-1998,2000-2006,2009-2015,2018, 2021, 2025
    Free Software Foundation, Inc.
 
    This file is part of Guile.
@@ -31,7 +31,6 @@
 #include "array-map.h"
 #include "bitvectors.h"
 #include "boolean.h"
-#include "bytevectors.h"
 #include "chars.h"
 #include "dynwind.h"
 #include "eq.h"
diff --git a/libguile/bytevectors-internal.h b/libguile/bytevectors-internal.h
new file mode 100644
index 000000000..0bee8ccdc
--- /dev/null
+++ b/libguile/bytevectors-internal.h
@@ -0,0 +1,125 @@
+#ifndef SCM_BYTEVECTORS_INTERNAL_H
+#define SCM_BYTEVECTORS_INTERNAL_H
+
+/* Copyright 2009, 2011, 2018, 2023, 2025
+     Free Software Foundation, Inc.
+
+   This file is part of Guile.
+
+   Guile is free software: you can redistribute it and/or modify it
+   under the terms of the GNU Lesser General Public License as published
+   by the Free Software Foundation, either version 3 of the License, or
+   (at your option) any later version.
+
+   Guile is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+   FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General Public
+   License for more details.
+
+   You should have received a copy of the GNU Lesser General Public
+   License along with Guile.  If not, see
+   <https://www.gnu.org/licenses/>.  */
+
+
+
+#include <libguile/bytevectors.h>
+#include <libguile/error.h>
+#include <libguile/uniform.h>
+
+struct scm_bytevector
+{
+  scm_t_bits tag_flags_and_element_type;
+  size_t length;
+  signed char *contents;
+  SCM parent;
+  signed char inline_contents[];
+};
+
+static inline struct scm_bytevector *
+scm_to_bytevector (SCM x)
+{
+  if (!SCM_BYTEVECTOR_P (x))
+    abort ();
+  return (struct scm_bytevector *) SCM_UNPACK_POINTER (x);
+}
+
+static inline SCM
+scm_from_bytevector (struct scm_bytevector *bv)
+{
+  return SCM_PACK_POINTER (bv);
+}
+
+enum scm_bytevector_flags
+  {
+    SCM_F_BYTEVECTOR_IMMUTABLE = 0x80UL,
+    SCM_F_BYTEVECTOR_CONTIGUOUS = 0x100UL
+  };
+
+static inline signed char*
+scm_bytevector_contents (struct scm_bytevector *bv)
+{
+  return bv->contents;
+}
+
+static inline SCM
+scm_bytevector_parent (struct scm_bytevector *bv)
+{
+  return bv->parent;
+}
+
+static inline int
+scm_is_mutable_bytevector (SCM x)
+{
+  scm_t_bits tag = SCM_CELL_TYPE (x);
+  return (tag & (0x7f | SCM_F_BYTEVECTOR_IMMUTABLE)) == scm_tc7_bytevector;
+}
+
+static inline scm_t_array_element_type
+scm_bytevector_element_type (struct scm_bytevector *bv)
+{
+  return bv->tag_flags_and_element_type >> 16;
+}
+
+static inline int
+scm_bytevector_is_contiguous (struct scm_bytevector *bv)
+{
+  return bv->tag_flags_and_element_type & SCM_F_BYTEVECTOR_CONTIGUOUS;
+}
+
+static inline int
+scm_bytevector_is_immutable (struct scm_bytevector *bv)
+{
+  return bv->tag_flags_and_element_type & SCM_F_BYTEVECTOR_IMMUTABLE;
+}
+
+static inline size_t
+scm_bytevector_type_size (struct scm_bytevector *bv)
+{
+  return scm_i_array_element_type_sizes[scm_bytevector_element_type (bv)]/8;
+}
+
+static inline size_t
+scm_bytevector_typed_length (struct scm_bytevector *bv)
+{
+  return bv->length / scm_bytevector_type_size (bv);
+}
+
+SCM_INTERNAL struct scm_bytevector*
+scm_i_make_typed_bytevector (size_t, scm_t_array_element_type);
+SCM_INTERNAL SCM scm_c_take_typed_bytevector (signed char *, size_t,
+                                              scm_t_array_element_type, SCM);
+
+SCM_INTERNAL void scm_bootstrap_bytevectors (void);
+SCM_INTERNAL void scm_init_bytevectors (void);
+
+SCM_INTERNAL SCM scm_i_native_endianness;
+SCM_INTERNAL SCM scm_c_take_gc_bytevector (signed char *, size_t, SCM);
+
+SCM_INTERNAL int scm_i_print_bytevector (SCM, SCM, scm_print_state *);
+
+SCM_INTERNAL struct scm_bytevector*
+scm_c_shrink_bytevector (struct scm_bytevector*, size_t);
+SCM_INTERNAL void scm_i_bytevector_generalized_set_x (SCM, size_t, SCM);
+SCM_INTERNAL SCM scm_null_bytevector;
+
+#endif /* SCM_BYTEVECTORS_INTERNAL_H */
diff --git a/libguile/bytevectors.c b/libguile/bytevectors.c
index 34da576d4..2fe58c0ac 100644
--- a/libguile/bytevectors.c
+++ b/libguile/bytevectors.c
@@ -44,6 +44,7 @@
 #include "array-handle.h"
 #include "arrays.h"
 #include "boolean.h"
+#include "bytevectors-internal.h"
 #include "dynwind.h"
 #include "extensions.h"
 #include "generalized-vectors.h"
@@ -92,10 +93,11 @@
   _sign char *c_bv;                                            \
                                                                \
   SCM_VALIDATE_##validate (1, bv);                              \
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);          \
   c_index = scm_to_size_t (index);                             \
                                                                \
-  c_len = SCM_BYTEVECTOR_LENGTH (bv);                          \
-  c_bv = (_sign char *) SCM_BYTEVECTOR_CONTENTS (bv);          \
+  c_len = bvp->length;                                          \
+  c_bv = (_sign char *) bvp->contents;                          \
                                                                \
   if (SCM_UNLIKELY (c_len < c_index                            \
                     || (c_len - c_index < (_len) / 8)))                \
@@ -193,21 +195,13 @@
 
 /* Bytevector type.  */
 
-#define SCM_BYTEVECTOR_HEADER_BYTES            \
-  (SCM_BYTEVECTOR_HEADER_SIZE * sizeof (scm_t_bits))
-
-#define SCM_BYTEVECTOR_SET_LENGTH(_bv, _len)            \
-  SCM_SET_CELL_WORD_1 ((_bv), (scm_t_bits) (_len))
-#define SCM_BYTEVECTOR_SET_CONTENTS(_bv, _contents)    \
-  SCM_SET_CELL_WORD_2 ((_bv), (scm_t_bits) (_contents))
-#define SCM_BYTEVECTOR_SET_PARENT(_bv, _parent)        \
-  SCM_SET_CELL_OBJECT_3 ((_bv), (_parent))
-
+#define SCM_MUTABLE_BYTEVECTOR_P(v) (scm_is_mutable_bytevector (v))
 #define SCM_VALIDATE_MUTABLE_BYTEVECTOR(pos, v) \
   SCM_MAKE_VALIDATE_MSG (pos, v, MUTABLE_BYTEVECTOR_P, "mutable bytevector")
 
 
 /* The empty bytevector.  */
+static struct scm_bytevector *null_bytevector;
 SCM scm_null_bytevector = SCM_UNSPECIFIED;
 
 
@@ -217,77 +211,63 @@ make_bytevector_tag (scm_t_bits flags, 
scm_t_array_element_type element_type)
   return scm_tc7_bytevector | flags | (element_type << 16);
 }
 
-static inline SCM
+static inline struct scm_bytevector *
 make_bytevector (size_t len, scm_t_array_element_type element_type)
 {
-  SCM ret;
-  size_t c_len;
-
   if (SCM_UNLIKELY (element_type > SCM_ARRAY_ELEMENT_TYPE_LAST
                     || scm_i_array_element_type_sizes[element_type] < 8))
     /* This would be an internal Guile programming error */
     abort ();
 
-  /* Make sure that the total allocation size will not overflow size_t,
-     with ~30 extra bytes to spare to avoid an overflow within the
-     allocator.  */
-  if (SCM_UNLIKELY (len >= (((size_t) -(SCM_BYTEVECTOR_HEADER_BYTES + 32))
-                            / 
(scm_i_array_element_type_sizes[element_type]/8))))
+  /* Make sure that the total allocation size will not overflow
+   * size_t.  */
+  size_t bytes_per_elt = scm_i_array_element_type_sizes[element_type]/8;
+  size_t max_size = (size_t) -1024;
+  if (SCM_UNLIKELY (len >= max_size / bytes_per_elt))
     scm_num_overflow ("make-bytevector");
 
   if (SCM_UNLIKELY (len == 0 && element_type == SCM_ARRAY_ELEMENT_TYPE_VU8
-                   && SCM_BYTEVECTOR_P (scm_null_bytevector)))
-    ret = scm_null_bytevector;
-  else
-    {
-      signed char *contents;
+                   && null_bytevector))
+    return null_bytevector;
 
-      c_len = len * (scm_i_array_element_type_sizes[element_type] / 8);
+  size_t c_len = len * bytes_per_elt;
+  struct scm_bytevector *bv =
+    scm_gc_malloc_pointerless (sizeof (struct scm_bytevector) + c_len,
+                               "bytevector");
 
-      contents = scm_gc_malloc_pointerless (SCM_BYTEVECTOR_HEADER_BYTES + 
c_len,
-                                           SCM_GC_BYTEVECTOR);
-      ret = SCM_PACK_POINTER (contents);
-      contents += SCM_BYTEVECTOR_HEADER_BYTES;
+  scm_t_bits flags = SCM_F_BYTEVECTOR_CONTIGUOUS;
+  bv->tag_flags_and_element_type = make_bytevector_tag (flags, element_type);
+  bv->length = c_len;
+  bv->contents = bv->inline_contents;
+  bv->parent = SCM_BOOL_F;
 
-      scm_t_bits flags = SCM_F_BYTEVECTOR_CONTIGUOUS;
-      SCM_SET_CELL_TYPE (ret, make_bytevector_tag (flags, element_type));
-      SCM_BYTEVECTOR_SET_LENGTH (ret, c_len);
-      SCM_BYTEVECTOR_SET_CONTENTS (ret, contents);
-      SCM_BYTEVECTOR_SET_PARENT (ret, SCM_BOOL_F);
-    }
-
-  return ret;
+  return bv;
 }
 
 /* Return a bytevector of LEN elements of type ELEMENT_TYPE, with element
    values taken from CONTENTS.  Assume that the storage for CONTENTS will be
    automatically reclaimed when it becomes unreachable.  */
-static inline SCM
+static inline struct scm_bytevector *
 make_bytevector_from_buffer (size_t len, void *contents,
                             scm_t_array_element_type element_type,
                              SCM parent, int is_immutable)
 {
-  SCM ret;
-
   if (SCM_UNLIKELY (len == 0))
-    ret = make_bytevector (len, element_type);
-  else
-    {
-      size_t c_len;
+    return make_bytevector (len, element_type);
 
-      ret = SCM_PACK_POINTER (scm_gc_malloc (SCM_BYTEVECTOR_HEADER_BYTES,
-                                             SCM_GC_BYTEVECTOR));
+  size_t bytes_per_elt = scm_i_array_element_type_sizes[element_type]/8;
+  size_t c_len = len * bytes_per_elt;
+  struct scm_bytevector *bv =
+    scm_gc_malloc (sizeof (struct scm_bytevector) + c_len,
+                   "bytevector");
 
-      c_len = len * (scm_i_array_element_type_sizes[element_type] / 8);
+  scm_t_bits flags = is_immutable ? SCM_F_BYTEVECTOR_IMMUTABLE : 0;
+  bv->tag_flags_and_element_type = make_bytevector_tag (flags, element_type);
+  bv->length = c_len;
+  bv->contents = contents;
+  bv->parent = parent;
 
-      scm_t_bits flags = is_immutable ? SCM_F_BYTEVECTOR_IMMUTABLE : 0;
-      SCM_SET_CELL_TYPE (ret, make_bytevector_tag (flags, element_type));
-      SCM_BYTEVECTOR_SET_LENGTH (ret, c_len);
-      SCM_BYTEVECTOR_SET_CONTENTS (ret, contents);
-      SCM_BYTEVECTOR_SET_PARENT (ret, parent);
-    }
-
-  return ret;
+  return bv;
 }
 
 
@@ -295,11 +275,11 @@ make_bytevector_from_buffer (size_t len, void *contents,
 SCM
 scm_c_make_bytevector (size_t len)
 {
-  return make_bytevector (len, SCM_ARRAY_ELEMENT_TYPE_VU8);
+  return scm_from_bytevector (make_bytevector (len, 
SCM_ARRAY_ELEMENT_TYPE_VU8));
 }
 
 /* Return a new bytevector of size LEN elements.  */
-SCM
+struct scm_bytevector*
 scm_i_make_typed_bytevector (size_t len, scm_t_array_element_type element_type)
 {
   return make_bytevector (len, element_type);
@@ -312,15 +292,17 @@ scm_i_make_typed_bytevector (size_t len, 
scm_t_array_element_type element_type)
 SCM
 scm_c_take_gc_bytevector (signed char *contents, size_t len, SCM parent)
 {
-  return make_bytevector_from_buffer (len, contents, 
SCM_ARRAY_ELEMENT_TYPE_VU8,
-                                      parent, 0);
+  return scm_from_bytevector
+    (make_bytevector_from_buffer (len, contents, SCM_ARRAY_ELEMENT_TYPE_VU8,
+                                  parent, 0));
 }
 
 SCM
 scm_c_take_typed_bytevector (signed char *contents, size_t len,
                              scm_t_array_element_type element_type, SCM parent)
 {
-  return make_bytevector_from_buffer (len, contents, element_type, parent, 0);
+  return scm_from_bytevector
+    (make_bytevector_from_buffer (len, contents, element_type, parent, 0));
 }
 
 SCM_DEFINE (scm_bytevector_slice, "bytevector-slice", 2, 1, 0,
@@ -340,67 +322,66 @@ SCM_DEFINE (scm_bytevector_slice, "bytevector-slice", 2, 
1, 0,
   scm_t_array_element_type element_type;
 
   SCM_VALIDATE_BYTEVECTOR (1, bv);
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);
 
   c_offset = scm_to_size_t (offset);
 
   if (SCM_UNBNDP (size))
     {
-      if (c_offset < SCM_BYTEVECTOR_LENGTH (bv))
-        c_size = SCM_BYTEVECTOR_LENGTH (bv) - c_offset;
+      if (c_offset < bvp->length)
+        c_size = bvp->length - c_offset;
       else
         c_size = 0;
     }
   else
     c_size = scm_to_size_t (size);
 
-  if (c_offset == 0 && c_size == SCM_BYTEVECTOR_LENGTH (bv))
+  if (c_offset == 0 && c_size == bvp->length)
     return bv;
 
-  if (INT_ADD_OVERFLOW (c_offset, c_size)
-      || (c_offset + c_size > SCM_BYTEVECTOR_LENGTH (bv)))
+  if (INT_ADD_OVERFLOW (c_offset, c_size) || (c_offset + c_size > bvp->length))
     scm_out_of_range (FUNC_NAME, offset);
 
   /* Preserve the element type of BV, unless we're not slicing on type
      boundaries.  */
-  element_type = SCM_BYTEVECTOR_ELEMENT_TYPE (bv);
-  if ((c_offset % SCM_BYTEVECTOR_TYPE_SIZE (bv) != 0)
-      || (c_size % SCM_BYTEVECTOR_TYPE_SIZE (bv) != 0))
+  element_type = scm_bytevector_element_type (bvp);
+  size_t elt_size = scm_bytevector_type_size (bvp);
+  if ((c_offset % elt_size != 0) || (c_size % elt_size != 0))
     element_type = SCM_ARRAY_ELEMENT_TYPE_VU8;
   else
-    c_size /= (scm_i_array_element_type_sizes[element_type] / 8);
+    c_size /= elt_size;
 
-  return make_bytevector_from_buffer (c_size,
-                                      SCM_BYTEVECTOR_CONTENTS (bv) + c_offset,
-                                      element_type,
-                                      bv,
-                                      !SCM_MUTABLE_BYTEVECTOR_P (bv));
+  return scm_from_bytevector
+    (make_bytevector_from_buffer (c_size,
+                                  bvp->contents + c_offset,
+                                  element_type,
+                                  bv,
+                                  scm_bytevector_is_immutable (bvp)));
 }
 #undef FUNC_NAME
 
 /* Shrink BV to C_NEW_LEN (which is assumed to be smaller than its current
    size) and return the new bytevector (possibly different from BV).  */
-SCM
-scm_c_shrink_bytevector (SCM bv, size_t c_new_len)
+struct scm_bytevector*
+scm_c_shrink_bytevector (struct scm_bytevector *bv, size_t new_len)
 {
-  if (SCM_UNLIKELY (c_new_len % SCM_BYTEVECTOR_TYPE_SIZE (bv)))
+  if (SCM_UNLIKELY (new_len % scm_bytevector_type_size (bv)))
     /* This would be an internal Guile programming error */
     abort ();
 
-  size_t c_len = SCM_BYTEVECTOR_LENGTH (bv);
-  if (SCM_UNLIKELY (c_new_len > c_len))
+  if (SCM_UNLIKELY (new_len > bv->length))
     abort ();
 
-  if (SCM_BYTEVECTOR_CONTIGUOUS_P (bv) && c_new_len > c_len / 2) 
+  if (scm_bytevector_is_contiguous (bv) && new_len > bv->length / 2) 
     {
-      SCM_BYTEVECTOR_SET_LENGTH (bv, c_new_len);
+      bv->length = new_len;
       return bv;
     }
 
-  SCM new_bv =
-    scm_i_make_typed_bytevector (c_new_len, SCM_BYTEVECTOR_ELEMENT_TYPE (bv));
+  struct scm_bytevector *new_bv =
+    scm_i_make_typed_bytevector (new_len, scm_bytevector_element_type (bv));
 
-  memcpy (SCM_BYTEVECTOR_CONTENTS (new_bv), SCM_BYTEVECTOR_CONTENTS (bv),
-          c_new_len);
+  memcpy (new_bv->inline_contents, bv->contents, new_len);
 
   return new_bv;
 }
@@ -416,8 +397,20 @@ scm_c_bytevector_length (SCM bv)
 #define FUNC_NAME "scm_c_bytevector_length"
 {
   SCM_VALIDATE_BYTEVECTOR (1, bv);
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);
 
-  return SCM_BYTEVECTOR_LENGTH (bv);
+  return bvp->length;
+}
+#undef FUNC_NAME
+
+signed char*
+scm_c_bytevector_contents (SCM bv)
+#define FUNC_NAME "scm_c_bytevector_contents"
+{
+  SCM_VALIDATE_BYTEVECTOR (1, bv);
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);
+
+  return scm_bytevector_contents (bvp);
 }
 #undef FUNC_NAME
 
@@ -429,9 +422,10 @@ scm_c_bytevector_ref (SCM bv, size_t index)
   const uint8_t *c_bv;
 
   SCM_VALIDATE_BYTEVECTOR (1, bv);
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);
 
-  c_len = SCM_BYTEVECTOR_LENGTH (bv);
-  c_bv = (uint8_t *) SCM_BYTEVECTOR_CONTENTS (bv);
+  c_len = bvp->length;
+  c_bv = (uint8_t *) bvp->contents;
 
   if (SCM_UNLIKELY (index >= c_len))
     scm_out_of_range (FUNC_NAME, scm_from_size_t (index));
@@ -448,9 +442,10 @@ scm_c_bytevector_set_x (SCM bv, size_t index, uint8_t 
value)
   uint8_t *c_bv;
 
   SCM_VALIDATE_MUTABLE_BYTEVECTOR (1, bv);
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);
 
-  c_len = SCM_BYTEVECTOR_LENGTH (bv);
-  c_bv = (uint8_t *) SCM_BYTEVECTOR_CONTENTS (bv);
+  c_len = bvp->length;
+  c_bv = (uint8_t *) bvp->contents;
 
   if (SCM_UNLIKELY (index >= c_len))
     scm_out_of_range (FUNC_NAME, scm_from_size_t (index));
@@ -528,7 +523,6 @@ SCM_DEFINE (scm_make_bytevector, "make-bytevector", 1, 1, 0,
            "optionally filled with @var{fill}.")
 #define FUNC_NAME s_scm_make_bytevector
 {
-  SCM bv;
   size_t c_len;
   uint8_t c_fill = 0;
 
@@ -543,20 +537,12 @@ SCM_DEFINE (scm_make_bytevector, "make-bytevector", 1, 1, 
0,
       c_fill = (uint8_t) value;
     }
 
-  bv = make_bytevector (c_len, SCM_ARRAY_ELEMENT_TYPE_VU8);
-  if (!scm_is_eq (fill, SCM_UNDEFINED))
-    {
-      size_t i;
-      uint8_t *contents;
-
-      contents = (uint8_t *) SCM_BYTEVECTOR_CONTENTS (bv);
-      for (i = 0; i < c_len; i++)
-       contents[i] = c_fill;
-    }
-  else
-    memset (SCM_BYTEVECTOR_CONTENTS (bv), 0, c_len);
+  struct scm_bytevector *bv =
+    make_bytevector (c_len, SCM_ARRAY_ELEMENT_TYPE_VU8);
+  if (c_fill)
+    memset (bv->contents, c_fill, bv->length);
 
-  return bv;
+  return scm_from_bytevector (bv);
 }
 #undef FUNC_NAME
 
@@ -575,27 +561,17 @@ SCM_DEFINE (scm_bytevector_eq_p, "bytevector=?", 2, 0, 0,
            "have the same length and contents.")
 #define FUNC_NAME s_scm_bytevector_eq_p
 {
-  SCM result = SCM_BOOL_F;
-  size_t c_len1, c_len2;
-
   SCM_VALIDATE_BYTEVECTOR (1, bv1);
   SCM_VALIDATE_BYTEVECTOR (2, bv2);
+  struct scm_bytevector *bvp1 = scm_to_bytevector (bv1);
+  struct scm_bytevector *bvp2 = scm_to_bytevector (bv2);
 
-  c_len1 = SCM_BYTEVECTOR_LENGTH (bv1);
-  c_len2 = SCM_BYTEVECTOR_LENGTH (bv2);
-
-  if (c_len1 == c_len2 && (SCM_BYTEVECTOR_ELEMENT_TYPE (bv1)
-                           == SCM_BYTEVECTOR_ELEMENT_TYPE (bv2)))
-    {
-      signed char *c_bv1, *c_bv2;
-
-      c_bv1 = SCM_BYTEVECTOR_CONTENTS (bv1);
-      c_bv2 = SCM_BYTEVECTOR_CONTENTS (bv2);
-
-      result = scm_from_bool (!memcmp (c_bv1, c_bv2, c_len1));
-    }
+  if (bvp1->length != bvp2->length)
+    return SCM_BOOL_F;
+  if (scm_bytevector_element_type (bvp1) != scm_bytevector_element_type (bvp2))
+    return SCM_BOOL_F;
 
-  return result;
+  return scm_from_bool (!memcmp (bvp1->contents, bvp2->contents, 
bvp1->length));
 }
 #undef FUNC_NAME
 
@@ -688,20 +664,14 @@ SCM_DEFINE (scm_bytevector_copy, "bytevector-copy", 1, 0, 
0,
            "Return a newly allocated copy of @var{bv}.")
 #define FUNC_NAME s_scm_bytevector_copy
 {
-  SCM copy;
-  size_t c_len;
-  signed char *c_bv, *c_copy;
-
   SCM_VALIDATE_BYTEVECTOR (1, bv);
+  struct scm_bytevector *bvp = scm_to_bytevector (bv);
 
-  c_len = SCM_BYTEVECTOR_LENGTH (bv);
-  c_bv = SCM_BYTEVECTOR_CONTENTS (bv);
-
-  copy = make_bytevector (c_len, SCM_ARRAY_ELEMENT_TYPE_VU8);
-  c_copy = SCM_BYTEVECTOR_CONTENTS (copy);
-  memcpy (c_copy, c_bv, c_len);
+  struct scm_bytevector *copy =
+    make_bytevector (bvp->length, SCM_ARRAY_ELEMENT_TYPE_VU8);
+  memcpy (copy->inline_contents, bvp->contents, bvp->length);
 
-  return copy;
+  return scm_from_bytevector (copy);
 }
 #undef FUNC_NAME
 
@@ -711,7 +681,7 @@ SCM_DEFINE (scm_uniform_array_to_bytevector, 
"uniform-array->bytevector",
             "will be copied from the uniform array @var{array}.")
 #define FUNC_NAME s_scm_uniform_array_to_bytevector
 {
-  SCM contents, ret;
+  SCM contents;
   size_t len, sz, byte_len;
   scm_t_array_handle h;
   const void *elts;
@@ -736,16 +706,13 @@ SCM_DEFINE (scm_uniform_array_to_bytevector, 
"uniform-array->bytevector",
     /* an internal guile error, really */
     SCM_MISC_ERROR ("uniform elements larger than 8 bits must fill whole 
bytes", SCM_EOL);
 
-  ret = make_bytevector (byte_len, SCM_ARRAY_ELEMENT_TYPE_VU8);
-  if (byte_len != 0)
-    /* Empty arrays may have elements == NULL.  We must avoid passing
-       NULL to memcpy, even if the length is zero, to avoid undefined
-       behavior. */
-    memcpy (SCM_BYTEVECTOR_CONTENTS (ret), elts, byte_len);
+  struct scm_bytevector *ret =
+    make_bytevector (byte_len, SCM_ARRAY_ELEMENT_TYPE_VU8);
+  memcpy (ret->inline_contents, elts, byte_len);
 
   scm_array_handle_release (&h);
 
-  return ret;
+  return scm_from_bytevector (ret);
 }
 #undef FUNC_NAME
 
@@ -821,16 +788,14 @@ SCM_DEFINE (scm_u8_list_to_bytevector, 
"u8-list->bytevector", 1, 0, 0,
            "Turn @var{lst}, a list of octets, into a bytevector.")
 #define FUNC_NAME s_scm_u8_list_to_bytevector
 {
-  SCM bv, item;
-  size_t c_len, i;
-  uint8_t *c_bv;
+  SCM item;
+  size_t len, i;
 
-  SCM_VALIDATE_LIST_COPYLEN (1, lst, c_len);
+  SCM_VALIDATE_LIST_COPYLEN (1, lst, len);
 
-  bv = make_bytevector (c_len, SCM_ARRAY_ELEMENT_TYPE_VU8);
-  c_bv = (uint8_t *) SCM_BYTEVECTOR_CONTENTS (bv);
+  struct scm_bytevector *bv = make_bytevector (len, 
SCM_ARRAY_ELEMENT_TYPE_VU8);
 
-  for (i = 0; i < c_len; lst = SCM_CDR (lst), i++)
+  for (i = 0; i < len; lst = SCM_CDR (lst), i++)
     {
       item = SCM_CAR (lst);
 
@@ -840,7 +805,7 @@ SCM_DEFINE (scm_u8_list_to_bytevector, 
"u8-list->bytevector", 1, 0, 0,
 
          c_item = SCM_I_INUM (item);
          if (SCM_LIKELY ((c_item >= 0) && (c_item < 256)))
-           c_bv[i] = (uint8_t) c_item;
+           bv->contents[i] = (uint8_t) c_item;
          else
            goto type_error;
        }
@@ -848,7 +813,7 @@ SCM_DEFINE (scm_u8_list_to_bytevector, 
"u8-list->bytevector", 1, 0, 0,
        goto type_error;
     }
 
-  return bv;
+  return scm_from_bytevector (bv);
 
  type_error:
   scm_wrong_type_arg (FUNC_NAME, 1, item);
@@ -1260,10 +1225,8 @@ SCM_DEFINE (scm_bytevector_to_uint_list, 
"bytevector->uint-list",
 
 
 #define INTEGER_LIST_TO_BYTEVECTOR(_sign)                              \
-  SCM bv;                                                              \
   size_t c_len;                                                                
\
   size_t c_size;                                                       \
-  char *c_bv, *c_bv_ptr;                                               \
                                                                        \
   SCM_VALIDATE_LIST_COPYLEN (1, lst, c_len);                           \
   SCM_VALIDATE_SYMBOL (2, endianness);                                 \
@@ -1272,19 +1235,19 @@ SCM_DEFINE (scm_bytevector_to_uint_list, 
"bytevector->uint-list",
   if (SCM_UNLIKELY (c_size == 0 || c_size >= (SIZE_MAX >> 3)))         \
     scm_out_of_range (FUNC_NAME, size);                                        
\
                                                                        \
-  bv = make_bytevector (c_len * c_size, SCM_ARRAY_ELEMENT_TYPE_VU8);    \
-  c_bv = (char *) SCM_BYTEVECTOR_CONTENTS (bv);                                
\
+  struct scm_bytevector *bv =                                           \
+    make_bytevector (c_len * c_size, SCM_ARRAY_ELEMENT_TYPE_VU8);       \
                                                                        \
-  for (c_bv_ptr = c_bv;                                                        
\
+  for (char *walk = (char *) bv->contents;                              \
        !scm_is_null (lst);                                             \
-       lst = SCM_CDR (lst), c_bv_ptr += c_size)                                
\
+       lst = SCM_CDR (lst), walk += c_size)                            \
     {                                                                  \
-      bytevector_ ## _sign ## _set (c_bv_ptr, c_size,                  \
+      bytevector_ ## _sign ## _set (walk, c_size,                      \
                                    SCM_CAR (lst), endianness,          \
                                    FUNC_NAME);                         \
     }                                                                  \
                                                                        \
-  return bv;
+  return scm_from_bytevector (bv);
 
 
 SCM_DEFINE (scm_uint_list_to_bytevector, "uint-list->bytevector",
@@ -1980,7 +1943,6 @@ utf_encoding_name (char *name, size_t utf_width, SCM 
endianness)
 
 /* Produce the body of a `string->utf' function.  */
 #define STRING_TO_UTF(_utf_width)                                       \
-  SCM utf;                                                              \
   int err;                                                              \
   char c_utf_name[MAX_UTF_ENCODING_NAME_LEN];                           \
   char *c_utf = NULL;                                                   \
@@ -2018,11 +1980,12 @@ utf_encoding_name (char *name, size_t utf_width, SCM 
endianness)
     }                                                                   \
   scm_dynwind_begin (0);                                                \
   scm_dynwind_free (c_utf);                                             \
-  utf = make_bytevector (c_utf_len, SCM_ARRAY_ELEMENT_TYPE_VU8);        \
-  memcpy (SCM_BYTEVECTOR_CONTENTS (utf), c_utf, c_utf_len);             \
+  struct scm_bytevector *utf =                                          \
+    make_bytevector (c_utf_len, SCM_ARRAY_ELEMENT_TYPE_VU8);            \
+  memcpy (utf->contents, c_utf, c_utf_len);                             \
   scm_dynwind_end ();                                                   \
                                                                         \
-  return (utf); 
+  return scm_from_bytevector (utf); 
 
 
 
@@ -2033,18 +1996,18 @@ SCM_DEFINE (scm_string_to_utf8, "string->utf8",
            "encoding of @var{str}.")
 #define FUNC_NAME s_scm_string_to_utf8
 {
-  SCM utf;
   uint8_t *c_utf;
   size_t c_utf_len = 0;
 
   SCM_VALIDATE_STRING (1, str);
 
   c_utf = (uint8_t *) scm_to_utf8_stringn (str, &c_utf_len);
-  utf = make_bytevector (c_utf_len, SCM_ARRAY_ELEMENT_TYPE_VU8);
-  memcpy (SCM_BYTEVECTOR_CONTENTS (utf), c_utf, c_utf_len);
+  struct scm_bytevector *utf =
+    make_bytevector (c_utf_len, SCM_ARRAY_ELEMENT_TYPE_VU8);
+  memcpy (utf->contents, c_utf, c_utf_len);
   free (c_utf);
 
-  return (utf);
+  return scm_from_bytevector (utf);
 }
 #undef FUNC_NAME
 
@@ -2074,7 +2037,6 @@ SCM_DEFINE (scm_string_to_utf32, "string->utf32",
            "encoding of @var{str}.")
 #define FUNC_NAME s_scm_string_to_utf32
 {
-  SCM bv;
   scm_t_wchar *wchars;
   size_t wchar_len, bytes_len;
 
@@ -2084,11 +2046,12 @@ SCM_DEFINE (scm_string_to_utf32, "string->utf32",
                   scm_i_native_endianness))
     swap_u32 (wchars, wchar_len);
   
-  bv = make_bytevector (bytes_len, SCM_ARRAY_ELEMENT_TYPE_VU8);
-  memcpy (SCM_BYTEVECTOR_CONTENTS (bv), wchars, bytes_len);
+  struct scm_bytevector *bv =
+    make_bytevector (bytes_len, SCM_ARRAY_ELEMENT_TYPE_VU8);
+  memcpy (bv->contents, wchars, bytes_len);
   free (wchars);
 
-  return bv;
+  return scm_from_bytevector (bv);
 }
 #undef FUNC_NAME
 
@@ -2180,7 +2143,8 @@ scm_bootstrap_bytevectors (void)
   /* This must be instantiated here because the generalized-vector API may
      want to access bytevectors even though `(rnrs bytevectors)' hasn't been
      loaded.  */
-  scm_null_bytevector = make_bytevector (0, SCM_ARRAY_ELEMENT_TYPE_VU8);
+  null_bytevector = make_bytevector (0, SCM_ARRAY_ELEMENT_TYPE_VU8);
+  scm_null_bytevector = scm_from_bytevector (null_bytevector);
 
 
   scm_endianness_big = sym_big = scm_from_latin1_symbol ("big");
diff --git a/libguile/bytevectors.h b/libguile/bytevectors.h
index 4ee862ca5..a1d291171 100644
--- a/libguile/bytevectors.h
+++ b/libguile/bytevectors.h
@@ -22,25 +22,17 @@
 
 
 
+#include <libguile/scm.h>
 #include <libguile/error.h>
-#include "libguile/gc.h"
-
-#include "libguile/uniform.h"
-
 
 /* R6RS bytevectors.  */
 
-/* The size in words of the bytevector header (type tag and flags, length,
-   and pointer to the underlying buffer).  */
-#define SCM_BYTEVECTOR_HEADER_SIZE   4U
-
-#define SCM_BYTEVECTOR_LENGTH(_bv)             \
-  ((size_t) SCM_CELL_WORD_1 (_bv))
-#define SCM_BYTEVECTOR_CONTENTS(_bv)           \
-  ((signed char *) SCM_CELL_WORD_2 (_bv))
-#define SCM_BYTEVECTOR_PARENT(_bv)             \
-  (SCM_CELL_OBJECT_3 (_bv))
-
+#define SCM_BYTEVECTOR_P(x) (SCM_HAS_TYP7 (x, scm_tc7_bytevector))
+#define SCM_VALIDATE_BYTEVECTOR(_pos, _obj)                    \
+  SCM_ASSERT_TYPE (SCM_BYTEVECTOR_P (_obj), (_obj), (_pos),    \
+                  FUNC_NAME, "bytevector")
+#define SCM_BYTEVECTOR_LENGTH(bv) (scm_c_bytevector_length (bv))
+#define SCM_BYTEVECTOR_CONTENTS(bv) (scm_c_bytevector_contents (bv))
 
 SCM_API SCM scm_endianness_big;
 SCM_API SCM scm_endianness_little;
@@ -48,6 +40,7 @@ SCM_API SCM scm_endianness_little;
 SCM_API SCM scm_c_make_bytevector (size_t);
 SCM_API int scm_is_bytevector (SCM);
 SCM_API size_t scm_c_bytevector_length (SCM);
+SCM_API signed char* scm_c_bytevector_contents (SCM);
 SCM_API uint8_t scm_c_bytevector_ref (SCM, size_t);
 SCM_API void scm_c_bytevector_set_x (SCM, size_t, uint8_t);
 
@@ -117,51 +110,4 @@ SCM_API SCM scm_utf8_to_string (SCM);
 SCM_API SCM scm_utf16_to_string (SCM, SCM);
 SCM_API SCM scm_utf32_to_string (SCM, SCM);
 
-
-
-/* Internal API.  */
-
-#define SCM_BYTEVECTOR_P(x) (SCM_HAS_TYP7 (x, scm_tc7_bytevector))
-
-#define SCM_F_BYTEVECTOR_IMMUTABLE 0x80UL
-#define SCM_F_BYTEVECTOR_CONTIGUOUS 0x100UL
-
-#define SCM_MUTABLE_BYTEVECTOR_P(x)                                     \
-  (SCM_NIMP (x) &&                                                      \
-   ((SCM_CELL_TYPE (x) & (0x7fUL | SCM_F_BYTEVECTOR_IMMUTABLE))  \
-    == scm_tc7_bytevector))
-
-#define SCM_BYTEVECTOR_ELEMENT_TYPE(_bv)       \
-  (SCM_CELL_TYPE (_bv) >> 16)
-#define SCM_BYTEVECTOR_CONTIGUOUS_P(_bv)       \
-  (SCM_CELL_TYPE (_bv) & SCM_F_BYTEVECTOR_CONTIGUOUS)
-
-#define SCM_BYTEVECTOR_TYPE_SIZE(var)                           \
-  (scm_i_array_element_type_sizes[SCM_BYTEVECTOR_ELEMENT_TYPE (var)]/8)
-#define SCM_BYTEVECTOR_TYPED_LENGTH(var)                        \
-  (SCM_BYTEVECTOR_LENGTH (var) / SCM_BYTEVECTOR_TYPE_SIZE (var))
-
-/* Hint that is passed to `scm_gc_malloc ()' and friends.  */
-#define SCM_GC_BYTEVECTOR "bytevector"
-
-#define SCM_VALIDATE_BYTEVECTOR(_pos, _obj)                    \
-  SCM_ASSERT_TYPE (SCM_BYTEVECTOR_P (_obj), (_obj), (_pos),    \
-                  FUNC_NAME, "bytevector")
-
-SCM_INTERNAL SCM scm_i_make_typed_bytevector (size_t, 
scm_t_array_element_type);
-SCM_INTERNAL SCM scm_c_take_typed_bytevector (signed char *, size_t,
-                                              scm_t_array_element_type, SCM);
-
-SCM_INTERNAL void scm_bootstrap_bytevectors (void);
-SCM_INTERNAL void scm_init_bytevectors (void);
-
-SCM_INTERNAL SCM scm_i_native_endianness;
-SCM_INTERNAL SCM scm_c_take_gc_bytevector (signed char *, size_t, SCM);
-
-SCM_INTERNAL int scm_i_print_bytevector (SCM, SCM, scm_print_state *);
-
-SCM_INTERNAL SCM scm_c_shrink_bytevector (SCM, size_t);
-SCM_INTERNAL void scm_i_bytevector_generalized_set_x (SCM, size_t, SCM);
-SCM_INTERNAL SCM scm_null_bytevector;
-
 #endif /* SCM_BYTEVECTORS_H */
diff --git a/libguile/foreign.c b/libguile/foreign.c
index ee6fc28b3..232532504 100644
--- a/libguile/foreign.c
+++ b/libguile/foreign.c
@@ -34,7 +34,7 @@
 #endif
 
 #include "boolean.h"
-#include "bytevectors.h"
+#include "bytevectors-internal.h"
 #include "dynwind.h"
 #include "eq.h"
 #include "eval.h"
@@ -54,6 +54,7 @@
 #include "symbols.h"
 #include "threads.h"
 #include "version.h"
+#include "uniform.h"
 
 #include "foreign.h"
 
diff --git a/libguile/goops.c b/libguile/goops.c
index d5fffd04d..8907dce50 100644
--- a/libguile/goops.c
+++ b/libguile/goops.c
@@ -31,6 +31,7 @@
 
 #include "async.h"
 #include "boolean.h"
+#include "bytevectors-internal.h"
 #include "chars.h"
 #include "dynwind.h"
 #include "ephemerons.h"
@@ -252,7 +253,8 @@ SCM_DEFINE (scm_class_of, "class-of", 1, 0, 0,
         case scm_tc7_vm_cont:
          return class_vm_cont;
        case scm_tc7_bytevector:
-          if (SCM_BYTEVECTOR_ELEMENT_TYPE (x) == SCM_ARRAY_ELEMENT_TYPE_VU8)
+          if (scm_bytevector_element_type (scm_to_bytevector (x))
+              == SCM_ARRAY_ELEMENT_TYPE_VU8)
             return class_bytevector;
           else
             return class_uvec;
diff --git a/libguile/init.c b/libguile/init.c
index 7a00024a3..a5935a437 100644
--- a/libguile/init.c
+++ b/libguile/init.c
@@ -48,7 +48,7 @@
 #include "backtrace.h"
 #include "bitvectors.h"
 #include "boolean.h"
-#include "bytevectors.h"
+#include "bytevectors-internal.h"
 #include "chars.h"
 #include "continuations.h"
 #include "control.h"
diff --git a/libguile/loader.c b/libguile/loader.c
index 5c6e14789..699931eec 100644
--- a/libguile/loader.c
+++ b/libguile/loader.c
@@ -38,7 +38,7 @@
 #endif
 
 #include "boolean.h"
-#include "bytevectors.h"
+#include "bytevectors-internal.h"
 #include "elf.h"
 #include "eval.h"
 #include "extensions.h"
diff --git a/libguile/print.c b/libguile/print.c
index f2921d5cc..db8996371 100644
--- a/libguile/print.c
+++ b/libguile/print.c
@@ -34,6 +34,7 @@
 #include "arrays.h"
 #include "atomic.h"
 #include "bitvectors.h"
+#include "bytevectors-internal.h"
 #include "boolean.h"
 #include "chars.h"
 #include "continuations.h"
diff --git a/libguile/r6rs-ports.c b/libguile/r6rs-ports.c
index 034564cfd..b4ce456ec 100644
--- a/libguile/r6rs-ports.c
+++ b/libguile/r6rs-ports.c
@@ -27,7 +27,7 @@
 #include <string.h>
 #include <stdio.h>
 #include "boolean.h"
-#include "bytevectors.h"
+#include "bytevectors-internal.h"
 #include "chars.h"
 #include "eval.h"
 #include "extensions.h"
@@ -275,7 +275,8 @@ SCM_DEFINE (scm_get_bytevector_n, "get-bytevector-n", 2, 0, 
0,
       if (c_read == 0)
         result = SCM_EOF_VAL;
       else
-       result = scm_c_shrink_bytevector (result, c_read);
+       result = scm_from_bytevector
+          (scm_c_shrink_bytevector (scm_to_bytevector (result), c_read));
     }
 
   return result;
diff --git a/libguile/srfi-4.c b/libguile/srfi-4.c
index 48f90f0b6..5096bf121 100644
--- a/libguile/srfi-4.c
+++ b/libguile/srfi-4.c
@@ -26,7 +26,7 @@
 #include <string.h>
 
 #include "boolean.h"
-#include "bytevectors.h"
+#include "bytevectors-internal.h"
 #include "error.h"
 #include "eval.h"
 #include "extensions.h"
@@ -119,7 +119,7 @@
 #define DEFINE_SRFI_4_C_FUNCS(TAG, tag, ctype, width)                   \
   SCM scm_take_##tag##vector (ctype *data, size_t n)                    \
   {                                                                     \
-    return scm_c_take_typed_bytevector ((int8_t*)data, n, ETYPE (TAG), \
+    return scm_c_take_typed_bytevector ((int8_t*)data, n, ETYPE (TAG),  \
                                         SCM_BOOL_F);                    \
   }                                                                     \
   const ctype* scm_array_handle_##tag##_elements (scm_t_array_handle *h) \
@@ -248,17 +248,12 @@ SCM_DEFINE (scm_make_srfi_4_vector, "make-srfi-4-vector", 
2, 1, 0,
     case SCM_ARRAY_ELEMENT_TYPE_C32:
     case SCM_ARRAY_ELEMENT_TYPE_C64:
       {
-        SCM ret;
-
         c_len = scm_to_size_t (len);
-        ret = scm_i_make_typed_bytevector (c_len, c_type);
-
-        if (SCM_UNBNDP (fill) || scm_is_eq (len, SCM_INUM0))
-          ; /* pass */
-        else if (scm_is_true (scm_zero_p (fill)))
-          memset (SCM_BYTEVECTOR_CONTENTS (ret), 0,
-                  SCM_BYTEVECTOR_LENGTH (ret));
-        else
+        SCM ret = scm_from_bytevector
+          (scm_i_make_typed_bytevector (c_len, c_type));
+
+        /* FIXME: Shouldn't be able to fill a u16 vector with 0.0.  */
+        if (!SCM_UNBNDP (fill) && scm_is_false (scm_zero_p (fill)))
           {
             scm_t_array_handle h;
             size_t i;
@@ -283,7 +278,7 @@ SCM_DEFINE (scm_srfi_4_vector_type_size, 
"srfi-4-vector-type-size", 1, 0, 0,
 #define FUNC_NAME s_scm_srfi_4_vector_type_size
 {
   SCM_VALIDATE_BYTEVECTOR (1, vec);
-  return scm_from_size_t (SCM_BYTEVECTOR_TYPE_SIZE (vec));
+  return scm_from_size_t (scm_bytevector_type_size (scm_to_bytevector (vec)));
 }
 #undef FUNC_NAME
 
diff --git a/libguile/strings.c b/libguile/strings.c
index 5eebb3300..9d87d0d14 100644
--- a/libguile/strings.c
+++ b/libguile/strings.c
@@ -1,4 +1,4 @@
-/* Copyright 1995-1996,1998,2000-2001,2004,2006,2008-2016,2018-2019
+/* Copyright 1995-1996,1998,2000-2001,2004,2006,2008-2016,2018-2019,2025
      Free Software Foundation, Inc.
 
    This file is part of Guile.
@@ -34,6 +34,7 @@
 #include <c-strcase.h>
 #include <intprops.h>
 
+#include "bytevectors-internal.h"
 #include "chars.h"
 #include "deprecation.h"
 #include "error.h"


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