aclocal.m4 (libiberty_AC_FUNC_C_ALLOCA): New.

[thirdparty/gcc.git] / libiberty / alloca.c

diff --git a/libiberty/alloca.c b/libiberty/alloca.c
index 0f8a21511db8f5112a4042762f6f8f0c4d5e5658..bf105d80f0fcbc7ea883c9ff855abd26d07ec6fe 100644 (file)
--- a/libiberty/alloca.c
+++ b/libiberty/alloca.c
@@ -25,6 +25,8 @@
 #include <config.h>
 #endif
 
+#include <libiberty.h>
+
 #ifdef HAVE_STRING_H
 #include <string.h>
 #endif
@@ -32,67 +34,20 @@
 #include <stdlib.h>
 #endif
 
-#ifdef emacs
-#include "blockinput.h"
-#endif
-
-/* If compiling with GCC 2, this file's not needed.  Except of course if
-   the C alloca is explicitly requested.  */
-#if defined (USE_C_ALLOCA) || !defined (__GNUC__) || __GNUC__ < 2
-
-/* If someone has defined alloca as a macro,
-   there must be some other way alloca is supposed to work.  */
-#ifndef alloca
-
-#ifdef emacs
-#ifdef static
-/* actually, only want this if static is defined as ""
-   -- this is for usg, in which emacs must undefine static
-   in order to make unexec workable
-   */
-#ifndef STACK_DIRECTION
-you
-lose
--- must know STACK_DIRECTION at compile-time
-#endif /* STACK_DIRECTION undefined */
-#endif /* static */
-#endif /* emacs */
-
 /* If your stack is a linked list of frames, you have to
    provide an "address metric" ADDRESS_FUNCTION macro.  */
 
 #if defined (CRAY) && defined (CRAY_STACKSEG_END)
-long i00afunc ();
+static long i00afunc ();
 #define ADDRESS_FUNCTION(arg) (char *) i00afunc (&(arg))
 #else
 #define ADDRESS_FUNCTION(arg) &(arg)
 #endif
 
-#if __STDC__
-typedef void *pointer;
-#else
-typedef char *pointer;
-#endif
-
 #ifndef NULL
 #define        NULL    0
 #endif
 
-/* Different portions of Emacs need to call different versions of
-   malloc.  The Emacs executable needs alloca to call xmalloc, because
-   ordinary malloc isn't protected from input signals.  On the other
-   hand, the utilities in lib-src need alloca to call malloc; some of
-   them are very simple, and don't have an xmalloc routine.
-
-   Non-Emacs programs expect this to call use xmalloc.
-
-   Callers below should use malloc.  */
-
-#ifndef emacs
-#define malloc xmalloc
-#endif
-extern pointer malloc ();
-
 /* Define STACK_DIRECTION if you know the direction of stack
    growth for your system; otherwise it will be automatically
    deduced at run-time.
@@ -168,9 +123,9 @@ static header *last_alloca_header = NULL;   /* -> last alloca header.  */
    caller, but that method cannot be made to work for some
    implementations of C, for example under Gould's UTX/32.  */
 
-pointer
-alloca (size)
-     unsigned size;
+PTR
+C_alloca (size)
+     size_t size;
 {
   auto char probe;             /* Probes stack depth: */
   register char *depth = ADDRESS_FUNCTION (probe);
@@ -186,17 +141,13 @@ alloca (size)
   {
     register header *hp;       /* Traverses linked list.  */
 
-#ifdef emacs
-    BLOCK_INPUT;
-#endif
-
     for (hp = last_alloca_header; hp != NULL;)
       if ((STACK_DIR > 0 && hp->h.deep > depth)
          || (STACK_DIR < 0 && hp->h.deep < depth))
        {
          register header *np = hp->h.next;
 
-         free ((pointer) hp);  /* Collect garbage.  */
+         free ((PTR) hp);      /* Collect garbage.  */
 
          hp = np;              /* -> next header.  */
        }
@@ -204,10 +155,6 @@ alloca (size)
        break;                  /* Rest are not deeper.  */
 
     last_alloca_header = hp;   /* -> last valid storage.  */
-
-#ifdef emacs
-    UNBLOCK_INPUT;
-#endif
   }
 
   if (size == 0)
@@ -216,7 +163,7 @@ alloca (size)
   /* Allocate combined header + user data storage.  */
 
   {
-    register pointer new = malloc (sizeof (header) + size);
+    register PTR new = xmalloc (sizeof (header) + size);
     /* Address of header.  */
 
     if (new == 0)
@@ -229,7 +176,7 @@ alloca (size)
 
     /* User storage begins just after header.  */
 
-    return (pointer) ((char *) new + sizeof (header));
+    return (PTR) ((char *) new + sizeof (header));
   }
 }
 
@@ -500,6 +447,3 @@ i00afunc (long address)
 
 #endif /* not CRAY2 */
 #endif /* CRAY */
-
-#endif /* no alloca */
-#endif /* not GCC version 2 */