From fe2649528b0b7637e6b6851c41e696a1016d8d53 Mon Sep 17 00:00:00 2001
From: Paul Eggert
Date: Tue, 4 Aug 2020 11:09:55 -0700
Subject: Drop support for -fcheck-pointer-bounds

GCC has removed the -fcheck-pointer bounds option, and the Linux
kernel has also removed support for Intel MPX, so there’s no point
to keeping this debugging option within Emacs.
* src/bytecode.c (BYTE_CODE_THREADED):
* src/lisp.h (DEFINE_LISP_SYMBOL, XSYMBOL, make_lisp_symbol):
Assume __CHKP__ is not defined.
* src/ptr-bounds.h: Remove.  All uses of ptr_bounds_clip,
ptr_bounds_copy, ptr_bounds_init, ptr_bounds_set removed.
---
 src/gmalloc.c | 16 ++++------------
 1 file changed, 4 insertions(+), 12 deletions(-)

(limited to 'src/gmalloc.c')

diff --git a/src/gmalloc.c b/src/gmalloc.c
index 8450a639e77..3560c744539 100644
--- a/src/gmalloc.c
+++ b/src/gmalloc.c
@@ -38,8 +38,6 @@ License along with this library.  If not, see <https://www.gnu.org/licenses/>.
 
 #include "lisp.h"
 
-#include "ptr-bounds.h"
-
 #ifdef HAVE_MALLOC_H
 # if GNUC_PREREQ (4, 2, 0)
 #  pragma GCC diagnostic ignored "-Wdeprecated-declarations"
@@ -200,8 +198,7 @@ extern size_t _bytes_free;
 
 /* Internal versions of `malloc', `realloc', and `free'
    used when these functions need to call each other.
-   They are the same but don't call the hooks
-   and don't bound the resulting pointers.  */
+   They are the same but don't call the hooks.  */
 extern void *_malloc_internal (size_t);
 extern void *_realloc_internal (void *, size_t);
 extern void _free_internal (void *);
@@ -551,7 +548,7 @@ malloc_initialize_1 (void)
   _heapinfo[0].free.size = 0;
   _heapinfo[0].free.next = _heapinfo[0].free.prev = 0;
   _heapindex = 0;
-  _heapbase = (char *) ptr_bounds_init (_heapinfo);
+  _heapbase = (char *) _heapinfo;
   _heaplimit = BLOCK (_heapbase + heapsize * sizeof (malloc_info));
 
   register_heapinfo ();
@@ -912,8 +909,7 @@ malloc (size_t size)
      among multiple threads.  We just leave it for compatibility with
      glibc malloc (i.e., assignments to gmalloc_hook) for now.  */
   hook = gmalloc_hook;
-  void *result = (hook ? hook : _malloc_internal) (size);
-  return ptr_bounds_clip (result, size);
+  return (hook ? hook : _malloc_internal) (size);
 }
 
 #if !(defined (_LIBC) || defined (HYBRID_MALLOC))
@@ -991,7 +987,6 @@ _free_internal_nolock (void *ptr)
 
   if (ptr == NULL)
     return;
-  ptr = ptr_bounds_init (ptr);
 
   PROTECT_MALLOC_STATE (0);
 
@@ -1303,7 +1298,6 @@ _realloc_internal_nolock (void *ptr, size_t size)
   else if (ptr == NULL)
     return _malloc_internal_nolock (size);
 
-  ptr = ptr_bounds_init (ptr);
   block = BLOCK (ptr);
 
   PROTECT_MALLOC_STATE (0);
@@ -1426,8 +1420,7 @@ realloc (void *ptr, size_t size)
     return NULL;
 
   hook = grealloc_hook;
-  void *result = (hook ? hook : _realloc_internal) (ptr, size);
-  return ptr_bounds_clip (result, size);
+  return (hook ? hook : _realloc_internal) (ptr, size);
 }
 /* Copyright (C) 1991, 1992, 1994 Free Software Foundation, Inc.
 
@@ -1601,7 +1594,6 @@ aligned_alloc (size_t alignment, size_t size)
 	{
 	  l->exact = result;
 	  result = l->aligned = (char *) result + adj;
-	  result = ptr_bounds_clip (result, size);
 	}
       UNLOCK_ALIGNED_BLOCKS ();
       if (l == NULL)
-- 
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