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
/* 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. */
#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. */
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);
/* 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));
}
}