Remove everything having to do with the use of mmap.

1 files changed, 0 insertions, 430 deletions

diff --git a/src/ralloc.c b/src/ralloc.c
index 9858e45a87e..d61c59a253b 100644
--- a/src/ralloc.c
+++ b/src/ralloc.c
@@ -926,7 +926,6 @@ r_alloc_sbrk (size)
   return address;
 }
 
-#ifndef REL_ALLOC_MMAP
 
 /* Allocate a relocatable bloc of storage of size SIZE.  A pointer to
    the data is returned in *PTR.  PTR is thus the address of some variable
@@ -1217,420 +1216,6 @@ r_alloc_check ()
 
 #endif /* DEBUG */
 
-#endif /* not REL_ALLOC_MMAP */
-
-
-/***********************************************************************
-                     Implementation based on mmap
- ***********************************************************************/
-
-#ifdef REL_ALLOC_MMAP
-
-#include <sys/types.h>
-#include <sys/mman.h>
-
-#ifndef MAP_ANON
-#ifdef MAP_ANONYMOUS
-#define MAP_ANON MAP_ANONYMOUS
-#else
-#define MAP_ANON 0
-#endif
-#endif
-
-#include <stdio.h>
-#include <errno.h>
-
-#if MAP_ANON == 0
-#include <fcntl.h>
-#endif
-
-
-/* Memory is allocated in regions which are mapped using mmap(2).
-   The current implementation lets the system select mapped
-   addresses;  we're not using MAP_FIXED in general, except when
-   trying to enlarge regions.
-
-   Each mapped region starts with a mmap_region structure, the user
-   area starts after that structure, aligned to MEM_ALIGN.
-
-        +-----------------------+
-        | struct mmap_info +    |
-        | padding               |
-        +-----------------------+
-        | user data             |
-        |                       |
-        |                       |
-        +-----------------------+  */
-
-struct mmap_region
-{
-  /* User-specified size.  */
-  size_t nbytes_specified;
-  
-  /* Number of bytes mapped */
-  size_t nbytes_mapped;
-
-  /* Pointer to the location holding the address of the memory
-     allocated with the mmap'd block.  The variable actually points
-     after this structure.  */
-  POINTER_TYPE **var;
-
-  /* Next and previous in list of all mmap'd regions.  */
-  struct mmap_region *next, *prev;
-};
-
-/* Doubly-linked list of mmap'd regions.  */
-
-static struct mmap_region *mmap_regions;
-
-/* File descriptor for mmap.  If we don't have anonymous mapping,
-   /dev/zero will be opened on it.  */
-
-static int mmap_fd;
-
-/* Temporary storage for mmap_set_vars, see there.  */
-
-static struct mmap_region *mmap_regions_1;
-static int mmap_fd_1;
-
-/* Value is X rounded up to the next multiple of N.  */
-
-#define ROUND(X, N)     (((X) + (N) - 1) / (N) * (N))
-
-/* Size of mmap_region structure plus padding.  */
-
-#define MMAP_REGION_STRUCT_SIZE \
-     ROUND (sizeof (struct mmap_region), MEM_ALIGN)
-
-/* Given a pointer P to the start of the user-visible part of a mapped
-   region, return a pointer to the start of the region.  */
-
-#define MMAP_REGION(P) \
-     ((struct mmap_region *) ((char *) (P) - MMAP_REGION_STRUCT_SIZE))
-
-/* Given a pointer P to the start of a mapped region, return a pointer
-   to the start of the user-visible part of the region.  */
-
-#define MMAP_USER_AREA(P) \
-     ((POINTER_TYPE *) ((char *) (P) + MMAP_REGION_STRUCT_SIZE))
-
-/* Function prototypes.  */
-
-static int mmap_free P_ ((struct mmap_region *));
-static int mmap_enlarge P_ ((struct mmap_region *, int));
-static struct mmap_region *mmap_find P_ ((POINTER_TYPE *, POINTER_TYPE *));
-POINTER_TYPE *r_alloc P_ ((POINTER_TYPE **, size_t));
-POINTER_TYPE *r_re_alloc P_ ((POINTER_TYPE **, size_t));
-void r_alloc_free P_ ((POINTER_TYPE **ptr));
-
-
-/* Return a region overlapping address range START...END, or null if
-   none.  END is not including, i.e. the last byte in the range
-   is at END - 1.  */
-
-static struct mmap_region *
-mmap_find (start, end)
-     POINTER_TYPE *start, *end;
-{
-  struct mmap_region *r;
-  char *s = (char *) start, *e = (char *) end;
-  
-  for (r = mmap_regions; r; r = r->next)
-    {
-      char *rstart = (char *) r;
-      char *rend   = rstart + r->nbytes_mapped;
-
-      if (/* First byte of range, i.e. START, in this region?  */
-          (s >= rstart && s < rend)
-          /* Last byte of range, i.e. END - 1, in this region?  */
-          || (e > rstart && e <= rend)
-          /* First byte of this region in the range?  */
-          || (rstart >= s && rstart < e)
-          /* Last byte of this region in the range?  */
-          || (rend > s && rend <= e))
-        break;
-    }
-
-  return r;
-}
-
-
-/* Unmap a region.  P is a pointer to the start of the user-araa of
-   the region.  Value is non-zero if successful.  */
-
-static int
-mmap_free (r)
-     struct mmap_region *r;
-{
-  if (r->next)
-    r->next->prev = r->prev;
-  if (r->prev)
-    r->prev->next = r->next;
-  else
-    mmap_regions = r->next;
-  
-  if (munmap (r, r->nbytes_mapped) == -1)
-    {
-      fprintf (stderr, "munmap: %s\n", emacs_strerror (errno));
-      return 0;
-    }
-
-  return 1;
-}
-
-
-/* Enlarge region R by NPAGES pages.  NPAGES < 0 means shrink R.
-   Value is non-zero if successful.  */
-
-static int
-mmap_enlarge (r, npages)
-     struct mmap_region *r;
-     int npages;
-{
-  char *region_end = (char *) r + r->nbytes_mapped;
-  size_t nbytes;
-  int success = 0;
-
-  if (npages < 0)
-    {
-      /* Unmap pages at the end of the region.  */
-      nbytes = - npages * page_size;
-      if (munmap (region_end - nbytes, nbytes) == -1)
-        fprintf (stderr, "munmap: %s\n", emacs_strerror (errno));
-      else
-        {
-          r->nbytes_mapped -= nbytes;
-          success = 1;
-        }
-    }
-  else if (npages > 0)
-    {
-      struct mmap_region *r2;
-      
-      nbytes = npages * page_size;
-      
-      /* Try to map additional pages at the end of the region.  We
-         cannot do this if the address range is already occupied by
-         something else because mmap deletes any previous mapping.
-         I'm not sure this is worth doing, let's see.  */
-      r2 = mmap_find (region_end, region_end + nbytes);
-      if (r2 == NULL)
-        {
-          POINTER_TYPE *p;
-      
-          p = mmap (region_end, nbytes, PROT_READ | PROT_WRITE,
-                    MAP_ANON | MAP_PRIVATE | MAP_FIXED, mmap_fd, 0);
-          if (p == MAP_FAILED)
-            fprintf (stderr, "mmap: %s\n", emacs_strerror (errno));
-          else if (p != (POINTER_TYPE *) region_end)
-            {
-              /* Kernels are free to choose a different address.  In
-                 that case, unmap what we've mapped above; we have
-                 no use for it.  */
-              if (munmap (p, nbytes) == -1)
-                fprintf (stderr, "munmap: %s\n", emacs_strerror (errno));
-            }
-          else
-            {
-              r->nbytes_mapped += nbytes;
-              success = 1;
-            }
-        }
-    }
-
-  return success;
-}
-
-
-/* Set or reset variables holding references to mapped regions.  If
-   RESTORE_P is zero, set all variables to null.  If RESTORE_P is
-   non-zero, set all variables to the start of the user-areas
-   of mapped regions.
-
-   This function is called from Fdump_emacs to ensure that the dumped
-   Emacs doesn't contain references to memory that won't be mapped
-   when Emacs starts.  */
-
-void
-mmap_set_vars (restore_p)
-     int restore_p;
-{
-  struct mmap_region *r;
-
-  if (restore_p)
-    {
-      mmap_regions = mmap_regions_1;
-      mmap_fd = mmap_fd_1;
-      for (r = mmap_regions; r; r = r->next)
-        *r->var = MMAP_USER_AREA (r);
-    }
-  else
-    {
-      for (r = mmap_regions; r; r = r->next)
-        *r->var = NULL;
-      mmap_regions_1 = mmap_regions;
-      mmap_regions = NULL;
-      mmap_fd_1 = mmap_fd;
-      mmap_fd = -1;
-    }
-}
-
-
-/* Return total number of bytes mapped.  */
-
-size_t
-mmap_mapped_bytes ()
-{
-  struct mmap_region *r;
-  size_t n = 0;
-  
-  for (r = mmap_regions; r; r = r->next)
-    n += r->nbytes_mapped;
-
-  return n;
-}
-
-
-/* Allocate a block of storage large enough to hold NBYTES bytes of
-   data.  A pointer to the data is returned in *VAR.  VAR is thus the
-   address of some variable which will use the data area.
-
-   The allocation of 0 bytes is valid.
-
-   If we can't allocate the necessary memory, set *VAR to null, and
-   return null.  */
-
-POINTER_TYPE *
-r_alloc (var, nbytes)
-     POINTER_TYPE **var;
-     size_t nbytes;
-{
-  void *p;
-  size_t map;
-
-  r_alloc_init ();
-
-  map = ROUND (nbytes + MMAP_REGION_STRUCT_SIZE, page_size);
-  p = mmap (NULL, map, PROT_READ | PROT_WRITE, MAP_ANON | MAP_PRIVATE,
-            mmap_fd, 0);
-  
-  if (p == MAP_FAILED)
-    {
-      if (errno != ENOMEM)
-        fprintf (stderr, "mmap: %s\n", emacs_strerror (errno));
-      p = NULL;
-    }
-  else
-    {
-      struct mmap_region *r = (struct mmap_region *) p;
-      
-      r->nbytes_specified = nbytes;
-      r->nbytes_mapped = map;
-      r->var = var;
-      r->prev = NULL;
-      r->next = mmap_regions;
-      if (r->next)
-        r->next->prev = r;
-      mmap_regions = r;
-      
-      p = MMAP_USER_AREA (p);
-    }
-  
-  return *var = p;
-}
-
-
-/* Given a pointer at address VAR to data allocated with r_alloc,
-   resize it to size NBYTES.  Change *VAR to reflect the new block,
-   and return this value.  If more memory cannot be allocated, then
-   leave *VAR unchanged, and return null.  */
-
-POINTER_TYPE *
-r_re_alloc (var, nbytes)
-     POINTER_TYPE **var;
-     size_t nbytes;
-{
-  POINTER_TYPE *result;
-  
-  r_alloc_init ();
-
-  if (*var == NULL)
-    result = r_alloc (var, nbytes);
-  else if (nbytes == 0) 
-    {
-      r_alloc_free (var);
-      result = r_alloc (var, nbytes);
-    }
-  else
-    {
-      struct mmap_region *r = MMAP_REGION (*var);
-      size_t room = r->nbytes_mapped - MMAP_REGION_STRUCT_SIZE;
-      
-      if (room < nbytes)
-        {
-          /* Must enlarge.  */
-          POINTER_TYPE *old_ptr = *var;
-
-          /* Try to map additional pages at the end of the region.
-             If that fails, allocate a new region,  copy data
-             from the old region, then free it.  */
-          if (mmap_enlarge (r, ROUND (nbytes - room, page_size) / page_size))
-            {
-              r->nbytes_specified = nbytes;
-              *var = result = old_ptr;
-            }
-          else if (r_alloc (var, nbytes))
-            {
-              bcopy (old_ptr, *var, r->nbytes_specified);
-              mmap_free (MMAP_REGION (old_ptr));
-              result = *var;
-              r = MMAP_REGION (result);
-              r->nbytes_specified = nbytes;
-            }
-          else
-            {
-              *var = old_ptr;
-              result = NULL;
-            }
-        }
-      else if (room - nbytes >= page_size)
-        {
-          /* Shrinking by at least a page.  Let's give some
-             memory back to the system.  */
-          mmap_enlarge (r, - (room - nbytes) / page_size);
-          result = *var;
-          r->nbytes_specified = nbytes;
-        }
-      else
-        {
-          /* Leave it alone.  */
-          result = *var;
-          r->nbytes_specified = nbytes;
-        }
-    }
-
-  return result;
-}
-
-
-/* Free a block of relocatable storage whose data is pointed to by
-   PTR.  Store 0 in *PTR to show there's no block allocated.  */
-
-void
-r_alloc_free (var)
-     POINTER_TYPE **var;
-{
-  r_alloc_init ();
-  
-  if (*var)
-    {
-      mmap_free (MMAP_REGION (*var));
-      *var = NULL;
-    }
-}
-
-#endif /* REL_ALLOC_MMAP */
-
 
 
 /***********************************************************************
@@ -1650,24 +1235,9 @@ extern POINTER (*__morecore) ();
 static void
 r_alloc_init ()
 {
-#if defined REL_ALLOC_MMAP && MAP_ANON == 0
-  /* The value of mmap_fd is initially 0 in temacs, and -1
-     in a dumped Emacs.  */
-  if (mmap_fd <= 0)
-    {
-      /* No anonymous mmap -- we need the file descriptor.  */
-      mmap_fd = open ("/dev/zero", O_RDONLY);
-      if (mmap_fd == -1)
-        fatal ("Cannot open /dev/zero: %s", emacs_strerror (errno));
-    }
-#endif /* REL_ALLOC_MMAP && MAP_ANON == 0 */
-
   if (r_alloc_initialized)
     return;
   r_alloc_initialized = 1;
-#if defined REL_ALLOC_MMAP && MAP_ANON != 0
-  mmap_fd = -1;
-#endif
   
   page_size = PAGE;
 #ifndef SYSTEM_MALLOC