386BSD 0.0 development

Work on file usr/src/usr.bin/gas/xrealloc.c
Work on file usr/src/usr.bin/gas/xmalloc.c
Work on file usr/src/usr.bin/gas/symbols.h
Work on file usr/src/usr.bin/gas/subsegs.h

Co-Authored-By: Lynne Greer Jolitz <ljolitz@cardio.ucsf.edu>
Synthesized-from: 386BSD-0.0/src

diff --git a/usr/src/usr.bin/gas/subsegs.h b/usr/src/usr.bin/gas/subsegs.h
new file mode 100644 (file)
index 0000000..b8dbaf7
--- /dev/null
+++ b/usr/src/usr.bin/gas/subsegs.h
@@ -0,0 +1,65 @@
+/* subsegs.h -> subsegs.c
+   Copyright (C) 1987 Free Software Foundation, Inc.
+
+This file is part of GAS, the GNU Assembler.
+
+GAS is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GAS is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GAS; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/*
+ * For every sub-segment the user mentions in the ASsembler program,
+ * we make one struct frchain. Each sub-segment has exactly one struct frchain
+ * and vice versa.
+ *
+ * Struct frchain's are forward chained (in ascending order of sub-segment
+ * code number). The chain runs through frch_next of each subsegment.
+ * This makes it hard to find a subsegment's frags
+ * if programmer uses a lot of them. Most programs only use text0 and
+ * data0, so they don't suffer. At least this way:
+ * (1) There are no "arbitrary" restrictions on how many subsegments
+ *     can be programmed;
+ * (2) Subsegments' frchain-s are (later) chained together in the order in
+ *     which they are emitted for object file viz text then data.
+ *
+ * From each struct frchain dangles a chain of struct frags. The frags
+ * represent code fragments, for that sub-segment, forward chained.
+ */
+
+struct frchain                 /* control building of a frag chain */
+{                              /* FRCH = FRagment CHain control */
+  struct frag *        frch_root;      /* 1st struct frag in chain, or NULL */
+  struct frag *        frch_last;      /* last struct frag in chain, or NULL */
+  struct frchain * frch_next;  /* next in chain of struct frchain-s */
+  segT         frch_seg;       /* SEG_TEXT or SEG_DATA. */
+  subsegT      frch_subseg;    /* subsegment number of this chain */
+};
+
+typedef struct frchain frchainS;
+
+extern frchainS * frchain_root;        /* NULL means no frchains yet. */
+                               /* all subsegments' chains hang off here */
+
+extern frchainS * frchain_now;
+                               /* Frchain we are assembling into now */
+                               /* That is, the current segment's frag */
+                               /* chain, even if it contains no (complete) */
+                               /* frags. */
+
+extern frchainS * data0_frchainP;
+                               /* Sentinel for frchain crawling. */
+                               /* Points to the 1st data-segment frchain. */
+                               /* (Which is pointed to by the last text- */
+                               /* segment frchain.) */
+
+/* end: subsegs.h */

diff --git a/usr/src/usr.bin/gas/symbols.h b/usr/src/usr.bin/gas/symbols.h
new file mode 100644 (file)
index 0000000..5a52790
--- /dev/null
+++ b/usr/src/usr.bin/gas/symbols.h
@@ -0,0 +1,42 @@
+/* symbols.h -
+   Copyright (C) 1987 Free Software Foundation, Inc.
+
+This file is part of GAS, the GNU Assembler.
+
+GAS is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GAS is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GAS; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+extern struct obstack  notes; /* eg FixS live here. */
+
+#define symbol_table_lookup(name) ((symbolS *)(symbol_find (name)))
+
+extern unsigned int local_bss_counter; /* Zeroed before a pass. */
+                               /* Only used by .lcomm directive. */
+
+
+extern symbolS * symbol_rootP; /* all the symbol nodes */
+extern symbolS * symbol_lastP; /* last struct symbol we made, or NULL */
+
+extern symbolS abs_symbol;
+
+symbolS *      symbol_find();
+void           symbol_begin();
+char *         local_label_name();
+void           local_colon();
+symbolS *      symbol_new();
+void           colon();
+void           symbol_table_insert();
+symbolS *      symbol_find_or_make();
+
+/* end: symbols.h */

diff --git a/usr/src/usr.bin/gas/xmalloc.c b/usr/src/usr.bin/gas/xmalloc.c
new file mode 100644 (file)
index 0000000..78c8c7f
--- /dev/null
+++ b/usr/src/usr.bin/gas/xmalloc.c
@@ -0,0 +1,60 @@
+/* xmalloc.c - get memory or bust
+   Copyright (C) 1987 Free Software Foundation, Inc.
+
+This file is part of GAS, the GNU Assembler.
+
+GAS is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GAS is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GAS; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+/*
+NAME
+       xmalloc() - get memory or bust
+INDEX
+       xmalloc() uses malloc()
+
+SYNOPSIS
+       char *  my_memory;
+
+       my_memory = xmalloc(42); / * my_memory gets address of 42 chars * /
+
+DESCRIPTION
+
+       Use xmalloc() as an "error-free" malloc(). It does almost the same job.
+       When it cannot honour your request for memory it BOMBS your program
+       with a "virtual memory exceeded" message. Malloc() returns NULL and
+       does not bomb your program.
+
+SEE ALSO
+       malloc()
+
+*/
+#ifdef USG
+#include <malloc.h>
+#endif
+
+char * xmalloc(n)
+     long n;
+{
+  char *       retval;
+  char *       malloc();
+  void error();
+
+  if ( ! (retval = malloc ((unsigned)n)) )
+    {
+      error("virtual memory exceeded");
+    }
+  return (retval);
+}
+
+/* end: xmalloc.c */

diff --git a/usr/src/usr.bin/gas/xrealloc.c b/usr/src/usr.bin/gas/xrealloc.c
new file mode 100644 (file)
index 0000000..a5010bc
--- /dev/null
+++ b/usr/src/usr.bin/gas/xrealloc.c
@@ -0,0 +1,61 @@
+/* xrealloc.c -new memory or bust-
+   Copyright (C) 1987 Free Software Foundation, Inc.
+
+This file is part of GAS, the GNU Assembler.
+
+GAS is free software; you can redistribute it and/or modify
+it under the terms of the GNU General Public License as published by
+the Free Software Foundation; either version 1, or (at your option)
+any later version.
+
+GAS is distributed in the hope that it will be useful,
+but WITHOUT ANY WARRANTY; without even the implied warranty of
+MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+GNU General Public License for more details.
+
+You should have received a copy of the GNU General Public License
+along with GAS; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+
+/* 
+
+NAME
+       xrealloc () - get more memory or bust
+INDEX
+       xrealloc () uses realloc ()
+SYNOPSIS
+       char   *my_memory;
+
+       my_memory = xrealloc (my_memory, 42);
+       / * my_memory gets (perhaps new) address of 42 chars * /
+
+DESCRIPTION
+
+       Use xrealloc () as an "error-free" realloc ().It does almost the same
+       job.  When it cannot honour your request for memory it BOMBS your
+       program with a "virtual memory exceeded" message.  Realloc() returns
+       NULL and does not bomb your program.
+
+SEE ALSO
+       realloc ()
+*/
+
+#ifdef USG
+#include <malloc.h>
+#endif
+
+char   *
+xrealloc (ptr, n)
+register char  *ptr;
+long    n;
+{
+    char   *realloc ();
+    void       error();
+
+    if ((ptr = realloc (ptr, (unsigned)n)) == 0)
+       error ("virtual memory exceeded");
+    return (ptr);
+}
+
+/* end: xrealloc.c */