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[pf3gnuchains/gcc-fork.git] / libiberty / alloca.c

diff --git a/libiberty/alloca.c b/libiberty/alloca.c
index bf105d8..9b2e9cb 100644 (file)
--- a/libiberty/alloca.c
+++ b/libiberty/alloca.c
@@ -21,6 +21,27 @@
    allocating any.  It is a good idea to use alloca(0) in
    your main control loop, etc. to force garbage collection.  */
 
+/*
+
+@deftypefn Replacement void* alloca (size_t @var{size})
+
+This function allocates memory which will be automatically reclaimed
+after the procedure exits.  The @libib{} implementation does not free
+the memory immediately but will do so eventually during subsequent
+calls to this function.  Memory is allocated using @code{xmalloc} under
+normal circumstances.
+
+The header file @file{alloca-conf.h} can be used in conjunction with the
+GNU Autoconf test @code{AC_FUNC_ALLOCA} to test for and properly make
+available this function.  The @code{AC_FUNC_ALLOCA} test requires that
+client code use a block of preprocessor code to be safe (see the Autoconf
+manual for more); this header incorporates that logic and more, including
+the possibility of a GCC built-in function.
+
+@end deftypefn
+
+*/
+
 #ifdef HAVE_CONFIG_H
 #include <config.h>
 #endif
@@ -34,6 +55,18 @@
 #include <stdlib.h>
 #endif
 
+/* These variables are used by the ASTRDUP implementation that relies
+   on C_alloca.  */
+#ifdef __cplusplus
+extern "C" {
+#endif /* __cplusplus */
+const char *libiberty_optr;
+char *libiberty_nptr;
+unsigned long libiberty_len;
+#ifdef __cplusplus
+}
+#endif /* __cplusplus */
+
 /* If your stack is a linked list of frames, you have to
    provide an "address metric" ADDRESS_FUNCTION macro.  */
 
@@ -70,7 +103,7 @@ static int stack_dir;                /* 1 or -1 once known.  */
 #define        STACK_DIR       stack_dir
 
 static void
-find_stack_direction ()
+find_stack_direction (void)
 {
   static char *addr = NULL;    /* Address of first `dummy', once known.  */
   auto char dummy;             /* To get stack address.  */
@@ -123,9 +156,10 @@ 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.  */
 
+/* @undocumented C_alloca */
+
 PTR
-C_alloca (size)
-     size_t size;
+C_alloca (size_t size)
 {
   auto char probe;             /* Probes stack depth: */
   register char *depth = ADDRESS_FUNCTION (probe);
@@ -163,20 +197,20 @@ C_alloca (size)
   /* Allocate combined header + user data storage.  */
 
   {
-    register PTR new = xmalloc (sizeof (header) + size);
+    register void *new_storage = XNEWVEC (char, sizeof (header) + size);
     /* Address of header.  */
 
-    if (new == 0)
+    if (new_storage == 0)
       abort();
 
-    ((header *) new)->h.next = last_alloca_header;
-    ((header *) new)->h.deep = depth;
+    ((header *) new_storage)->h.next = last_alloca_header;
+    ((header *) new_storage)->h.deep = depth;
 
-    last_alloca_header = (header *) new;
+    last_alloca_header = (header *) new_storage;
 
     /* User storage begins just after header.  */
 
-    return (PTR) ((char *) new + sizeof (header));
+    return (PTR) ((char *) new_storage + sizeof (header));
   }
 }