gdb-2.4+.aux.coff

1 files changed, 1099 insertions, 0 deletions

diff --git a/gdb/symtab.c b/gdb/symtab.c
new file mode 100644
index 0000000..a413bfa
--- /dev/null
+++ b/gdb/symtab.c
@@ -0,0 +1,1099 @@
+/* Symbol table lookup for the GNU debugger, GDB.
+   Copyright (C) 1986, 1987 Free Software Foundation, Inc.
+
+GDB is distributed in the hope that it will be useful, but WITHOUT ANY
+WARRANTY.  No author or distributor accepts responsibility to anyone
+for the consequences of using it or for whether it serves any
+particular purpose or works at all, unless he says so in writing.
+Refer to the GDB General Public License for full details.
+
+Everyone is granted permission to copy, modify and redistribute GDB,
+but only under the conditions described in the GDB General Public
+License.  A copy of this license is supposed to have been given to you
+along with GDB so you can know your rights and responsibilities.  It
+should be in a file named COPYING.  Among other things, the copyright
+notice and this notice must be preserved on all copies.
+
+In other words, go ahead and share GDB, but don't try to stop
+anyone else from sharing it farther.  Help stamp out software hoarding!
+*/
+
+#include "defs.h"
+#include "initialize.h"
+#include "symtab.h"
+#include "param.h"
+
+#include <stdio.h>
+#include <obstack.h>
+
+#ifdef mac_aux
+#define REGCMP
+#endif
+
+START_FILE
+
+/* Allocate an obstack to hold objects that should be freed
+   when we load a new symbol table.
+   This includes the symbols made by dbxread
+   and the types that are not permanent.  */
+
+struct obstack obstack1;
+
+struct obstack *symbol_obstack = &obstack1;
+
+/* These variables point to the objects
+   representing the predefined C data types.  */
+
+struct type *builtin_type_void;
+struct type *builtin_type_char;
+struct type *builtin_type_short;
+struct type *builtin_type_int;
+struct type *builtin_type_long;
+struct type *builtin_type_unsigned_char;
+struct type *builtin_type_unsigned_short;
+struct type *builtin_type_unsigned_int;
+struct type *builtin_type_unsigned_long;
+struct type *builtin_type_float;
+struct type *builtin_type_double;
+
+/* Lookup the symbol table of a source file named NAME.  */
+
+struct symtab *
+lookup_symtab (name)
+     char *name;
+{
+  register struct symtab *s;
+  register char *copy;
+
+  for (s = symtab_list; s; s = s->next)
+    if (!strcmp (name, s->filename))
+      return s;
+
+  /* If name not found as specified, see if adding ".c" helps.  */
+
+  copy = (char *) alloca (strlen (name) + 3);
+  strcpy (copy, name);
+  strcat (copy, ".c");
+  for (s = symtab_list; s; s = s->next)
+    if (!strcmp (copy, s->filename))
+      return s;
+
+  return 0;
+}
+
+/* Lookup a typedef or primitive type named NAME,
+   visible in lexical block BLOCK.
+   If NOERR is nonzero, return zero if NAME is not suitably defined.  */
+
+struct type *
+lookup_typename (name, block, noerr)
+     char *name;
+     struct block *block;
+     int noerr;
+{
+  register struct symbol *sym = lookup_symbol (name, block, VAR_NAMESPACE);
+  if (sym == 0 || SYMBOL_CLASS (sym) != LOC_TYPEDEF)
+    {
+      if (!strcmp (name, "int"))
+	return builtin_type_int;
+      if (!strcmp (name, "long"))
+	return builtin_type_long;
+      if (!strcmp (name, "short"))
+	return builtin_type_short;
+      if (!strcmp (name, "char"))
+	return builtin_type_char;
+      if (!strcmp (name, "float"))
+	return builtin_type_float;
+      if (!strcmp (name, "double"))
+	return builtin_type_double;
+      if (!strcmp (name, "void"))
+	return builtin_type_void;
+
+      if (noerr)
+	return 0;
+      error ("No type named %s.", name);
+    }
+  return SYMBOL_TYPE (sym);
+}
+
+struct type *
+lookup_unsigned_typename (name)
+     char *name;
+{
+  if (!strcmp (name, "int"))
+    return builtin_type_unsigned_int;
+  if (!strcmp (name, "long"))
+    return builtin_type_unsigned_long;
+  if (!strcmp (name, "short"))
+    return builtin_type_unsigned_short;
+  if (!strcmp (name, "char"))
+    return builtin_type_unsigned_char;
+  error ("No type named unsigned %s.", name);
+}
+
+/* Lookup a structure type named "struct NAME",
+   visible in lexical block BLOCK.  */
+
+struct type *
+lookup_struct (name, block)
+     char *name;
+     struct block *block;
+{
+  register struct symbol *sym = lookup_symbol (name, block, STRUCT_NAMESPACE);
+  if (sym == 0)
+    error ("No struct type named %s.", name);
+  if (TYPE_CODE (SYMBOL_TYPE (sym)) != TYPE_CODE_STRUCT)
+    error ("This context has union or enum %s, not a struct.", name);
+  return SYMBOL_TYPE (sym);
+}
+
+/* Lookup a union type named "union NAME",
+   visible in lexical block BLOCK.  */
+
+struct type *
+lookup_union (name, block)
+     char *name;
+     struct block *block;
+{
+  register struct symbol *sym = lookup_symbol (name, block, STRUCT_NAMESPACE);
+  if (sym == 0)
+    error ("No union type named %s.", name);
+  if (TYPE_CODE (SYMBOL_TYPE (sym)) != TYPE_CODE_UNION)
+    error ("This context has struct or enum %s, not a union.", name);
+  return SYMBOL_TYPE (sym);
+}
+
+/* Lookup an enum type named "enum NAME",
+   visible in lexical block BLOCK.  */
+
+struct type *
+lookup_enum (name, block)
+     char *name;
+     struct block *block;
+{
+  register struct symbol *sym = lookup_symbol (name, block, STRUCT_NAMESPACE);
+  if (sym == 0)
+    error ("No enum type named %s.", name);
+  if (TYPE_CODE (SYMBOL_TYPE (sym)) != TYPE_CODE_ENUM)
+    error ("This context has struct or union %s, not an enum.", name);
+  return SYMBOL_TYPE (sym);
+}
+
+/* Given a type TYPE, return a type of pointers to that type.
+   May need to construct such a type if this is the first use.  */
+
+struct type *
+lookup_pointer_type (type)
+     struct type *type;
+{
+  register struct type *ptype = TYPE_POINTER_TYPE (type);
+  if (ptype) return ptype;
+
+  /* This is the first time anyone wanted a pointer to a TYPE.  */
+  if (TYPE_FLAGS (type) & TYPE_FLAG_PERM)
+    ptype  = (struct type *) xmalloc (sizeof (struct type));
+  else
+    ptype  = (struct type *) obstack_alloc (symbol_obstack,
+					    sizeof (struct type));
+
+  bzero (ptype, sizeof (struct type));
+  TYPE_TARGET_TYPE (ptype) = type;
+  TYPE_POINTER_TYPE (type) = ptype;
+  /* New type is permanent if type pointed to is permanent.  */
+  if (TYPE_FLAGS (type) & TYPE_FLAG_PERM)
+    TYPE_FLAGS (ptype) |= TYPE_FLAG_PERM;
+  /* We assume the machine has only one representation for pointers!  */
+  TYPE_LENGTH (ptype) = sizeof (char *);
+  TYPE_CODE (ptype) = TYPE_CODE_PTR;
+  return ptype;
+}
+
+/* Given a type TYPE, return a type of functions that return that type.
+   May need to construct such a type if this is the first use.  */
+
+struct type *
+lookup_function_type (type)
+     struct type *type;
+{
+  register struct type *ptype = TYPE_FUNCTION_TYPE (type);
+  if (ptype) return ptype;
+
+  /* This is the first time anyone wanted a function returning a TYPE.  */
+  if (TYPE_FLAGS (type) & TYPE_FLAG_PERM)
+    ptype  = (struct type *) xmalloc (sizeof (struct type));
+  else
+    ptype  = (struct type *) obstack_alloc (symbol_obstack,
+					    sizeof (struct type));
+
+  bzero (ptype, sizeof (struct type));
+  TYPE_TARGET_TYPE (ptype) = type;
+  TYPE_FUNCTION_TYPE (type) = ptype;
+  /* New type is permanent if type returned is permanent.  */
+  if (TYPE_FLAGS (type) & TYPE_FLAG_PERM)
+    TYPE_FLAGS (ptype) |= TYPE_FLAG_PERM;
+  TYPE_LENGTH (ptype) = 1;
+  TYPE_CODE (ptype) = TYPE_CODE_FUNC;
+  TYPE_NFIELDS (ptype) = 0;
+  return ptype;
+}
+
+/* Smash TYPE to be a type of pointers to TO_TYPE.
+   If TO_TYPE is not permanent and has no pointer-type yet,
+   record TYPE as its pointer-type.  */
+
+void
+smash_to_pointer_type (type, to_type)
+     struct type *type, *to_type;
+{
+  bzero (type, sizeof (struct type));
+  TYPE_TARGET_TYPE (type) = to_type;
+  /* We assume the machine has only one representation for pointers!  */
+  TYPE_LENGTH (type) = sizeof (char *);
+  TYPE_CODE (type) = TYPE_CODE_PTR;
+
+  if (TYPE_POINTER_TYPE (to_type) == 0
+      && !(TYPE_FLAGS (type) & TYPE_FLAG_PERM))
+    {
+      TYPE_POINTER_TYPE (to_type) = type;
+    }
+}
+
+/* Smash TYPE to be a type of functions returning TO_TYPE.
+   If TO_TYPE is not permanent and has no function-type yet,
+   record TYPE as its function-type.  */
+
+void
+smash_to_function_type (type, to_type)
+     struct type *type, *to_type;
+{
+  bzero (type, sizeof (struct type));
+  TYPE_TARGET_TYPE (type) = to_type;
+  TYPE_LENGTH (type) = 1;
+  TYPE_CODE (type) = TYPE_CODE_FUNC;
+  TYPE_NFIELDS (type) = 0;
+
+  if (TYPE_FUNCTION_TYPE (to_type) == 0
+      && !(TYPE_FLAGS (type) & TYPE_FLAG_PERM))
+    {
+      TYPE_FUNCTION_TYPE (to_type) = type;
+    }
+}
+
+static struct symbol *lookup_block_symbol ();
+
+/* Find the definition for a specified symbol name NAME
+   in namespace NAMESPACE, visible from lexical block BLOCK.
+   Returns the struct symbol pointer, or zero if no symbol is found.  */
+
+struct symbol *
+lookup_symbol (name, block, namespace)
+     char *name;
+     register struct block *block;
+     enum namespace namespace;
+{
+  register int i, n;
+  register struct symbol *sym;
+  register struct symtab *s;
+  struct blockvector *bv;
+
+  /* Search specified block and its superiors.  */
+
+  while (block != 0)
+    {
+      sym = lookup_block_symbol (block, name, namespace);
+      if (sym) return sym;
+      block = BLOCK_SUPERBLOCK (block);
+    }
+
+  /* Now search all symtabs' global blocks.  */
+
+  for (s = symtab_list; s; s = s->next)
+    {
+      bv = BLOCKVECTOR (s);
+      block = BLOCKVECTOR_BLOCK (bv, 0);
+      sym = lookup_block_symbol (block, name, namespace);
+      if (sym) return sym;
+    }
+
+  /* Now search all symtabs' per-file blocks.
+     Not strictly correct, but more useful than an error.  */
+
+  for (s = symtab_list; s; s = s->next)
+    {
+      bv = BLOCKVECTOR (s);
+      block = BLOCKVECTOR_BLOCK (bv, 1);
+      sym = lookup_block_symbol (block, name, namespace);
+      if (sym) return sym;
+    }
+  return 0;
+}
+
+/* Look for a symbol in block BLOCK using binary search.  */
+
+static struct symbol *
+lookup_block_symbol (block, name, namespace)
+     register struct block *block;
+     char *name;
+     enum namespace namespace;
+{
+  register int bot, top, inc;
+  register struct symbol *sym;
+
+  top = BLOCK_NSYMS (block);
+  bot = 0;
+
+  /* First, advance BOT to not far before
+     the first symbol whose name is NAME.  */
+
+  while (1)
+    {
+      inc = (top - bot + 1);
+      /* No need to keep binary searching for the last few bits worth.  */
+      if (inc < 7)
+	break;
+      inc >>= 1;
+      sym = BLOCK_SYM (block, bot + inc);
+      if (strcmp (SYMBOL_NAME (sym), name) < 0)
+	bot += inc;
+      else
+	top = bot + inc;
+    }
+
+  /* Now scan forward until we run out of symbols,
+     find one whose name is greater than NAME,
+     or find one we want.
+     If there is more than one symbol with the right name and namespace,
+     we return the first one.  dbxread.c is careful to make sure
+     that if one is a register then it comes first.  */
+
+  top = BLOCK_NSYMS (block);
+  while (bot < top)
+    {
+      sym = BLOCK_SYM (block, bot);
+      inc = strcmp (SYMBOL_NAME (sym), name);
+      if (inc == 0 && SYMBOL_NAMESPACE (sym) == namespace)
+	return sym;
+      if (inc > 0)
+	return 0;
+      bot++;
+    }
+  return 0;
+}
+
+/* Return the symbol for the function which contains a specified
+   lexical block, described by a struct block BL.  */
+
+struct symbol *
+block_function (bl)
+     struct block *bl;
+{
+  while (BLOCK_FUNCTION (bl) == 0 && BLOCK_SUPERBLOCK (bl) != 0)
+    bl = BLOCK_SUPERBLOCK (bl);
+
+  return BLOCK_FUNCTION (bl);
+}
+
+/* Subroutine of find_pc_line */
+
+static struct symtab *
+find_pc_symtab (pc)
+     register CORE_ADDR pc;
+{
+  register struct block *b;
+  struct blockvector *bv;
+  register struct symtab *s;
+
+  /* Search all symtabs for one whose file contains our pc */
+
+  for (s = symtab_list; s; s = s->next)
+    {
+      bv = BLOCKVECTOR (s);
+      b = BLOCKVECTOR_BLOCK (bv, 0);
+      if (BLOCK_START (b) <= pc
+	  && BLOCK_END (b) > pc)
+	break;
+    }
+
+  return s;
+}
+
+/* Find the source file and line number for a given PC value.
+   Return a structure containing a symtab pointer, a line number,
+   and a pc range for the entire source line.
+   The value's .pc field is NOT the specified pc.
+   NOTCURRENT nonzero means, if specified pc is on a line boundary,
+   use the line that ends there.  Otherwise, in that case, the line
+   that begins there is used.  */
+
+struct symtab_and_line
+find_pc_line (pc, notcurrent)
+     CORE_ADDR pc;
+     int notcurrent;
+{
+  struct symtab *s;
+  register struct linetable *l;
+  register int len;
+  register int i, item;
+  int line;
+  struct symtab_and_line value;
+  struct blockvector *bv;
+
+  /* Info on best line seen so far, and where it starts, and its file.  */
+
+  int best_line = 0;
+  CORE_ADDR best_pc = 0;
+  CORE_ADDR best_end = 0;
+  struct symtab *best_symtab = 0;
+
+  /* Store here the first line number
+     of a file which contains the line at the smallest pc after PC.
+     If we don't find a line whose range contains PC,
+     we will use a line one less than this,
+     with a range from the start of that file to the first line's pc.  */
+  int alt_line = 0;
+  CORE_ADDR alt_pc = 0;
+  struct symtab *alt_symtab = 0;
+
+  /* Info on best line seen in this file.  */
+
+  int prev_line;
+  CORE_ADDR prev_pc;
+
+  /* Info on first line of this file.  */
+
+  int first_line;
+  CORE_ADDR first_pc;
+
+  /* If this pc is not from the current frame,
+     it is the address of the end of a call instruction.
+     Quite likely that is the start of the following statement.
+     But what we want is the statement containing the instruction.
+     Fudge the pc to make sure we get that.  */
+
+  if (notcurrent) pc -= 1;
+
+  s = find_pc_symtab (pc);
+  if (s == 0)
+    {
+      value.symtab = 0;
+      value.line = 0;
+      value.pc = pc;
+      return value;
+    }
+
+  bv = BLOCKVECTOR (s);
+
+  /* Look at all the symtabs that share this blockvector.
+     They all have the same apriori range, that we found was right;
+     but they have different line tables.  */
+
+  for (; s && BLOCKVECTOR (s) == bv; s = s->next)
+    {
+      /* Find the best line in this symtab.  */
+      l = LINETABLE (s);
+      len = l->nitems;
+      prev_line = -1;
+      first_line = -1;
+      for (i = 0; i < len; i++)
+	{
+	  item = l->item[i];
+	  if (item < 0)
+	    line = - item - 1;
+	  else
+	    {
+	      line++;
+	      if (first_line < 0)
+		{
+		  first_line = line;
+		  first_pc = item;
+		}
+	      /* Return the last line that did not start after PC.  */
+	      if (pc >= item)
+		{
+		  prev_line = line;
+		  prev_pc = item;
+		}
+	      else
+		break;
+	    }
+	}
+
+      /* Is this file's best line closer than the best in the other files?
+	 If so, record this file, and its best line, as best so far.  */
+      if (prev_line >= 0 && prev_pc > best_pc)
+	{
+	  best_pc = prev_pc;
+	  best_line = prev_line;
+	  best_symtab = s;
+	  if (i < len)
+	    best_end = item;
+	  else
+	    best_end = 0;
+	}
+      /* Is this file's first line closer than the first lines of other files?
+	 If so, record this file, and its first line, as best alternate.  */
+      if (first_line >= 0 && first_pc > pc
+	  && (alt_pc == 0 || first_pc < alt_pc))
+	{
+	  alt_pc = first_pc;
+	  alt_line = first_line;
+	  alt_symtab = s;
+	}
+    }
+  if (best_symtab == 0)
+    {
+      value.symtab = alt_symtab;
+      value.line = alt_line - 1;
+      value.pc = BLOCK_END (BLOCKVECTOR_BLOCK (bv, 0));
+      value.end = alt_pc;
+    }
+  else
+    {
+      value.symtab = best_symtab;
+      value.line = best_line;
+      value.pc = best_pc;
+      value.end = (best_end ? best_end
+		   : (alt_pc ? alt_pc
+		      : BLOCK_END (BLOCKVECTOR_BLOCK (bv, 0))));
+    }
+  return value;
+}
+
+/* Find the range of pc values in a line.
+   Store the starting pc of the line into *STARTPTR
+   and the ending pc (start of next line) into *ENDPTR.
+   Returns 1 to indicate success.
+   Returns 0 if could not find the specified line.  */
+
+int
+find_line_pc_range (symtab, thisline, startptr, endptr)
+     struct symtab *symtab;
+     int thisline;
+     CORE_ADDR *startptr, *endptr;
+{
+  register struct linetable *l;
+  register int i, line, item;
+  int len;
+  register CORE_ADDR prev_pc;
+  CORE_ADDR last_pc;
+
+  if (symtab == 0)
+    return 0;
+
+  l = LINETABLE (symtab);
+  len = l->nitems;
+  prev_pc = -1;
+  for (i = 0; i < len; i++)
+    {
+      item = l->item[i];
+      if (item < 0)
+	line = - item - 1;
+      else
+	{
+	  line++;
+	  /* As soon as we find a line following the specified one
+	     we know the end pc and can return.  */
+	  if (line > thisline)
+	    {
+	      /* If we have not seen an entry for the specified line,
+		 assume that means the specified line has zero bytes.  */
+	      *startptr = prev_pc == -1 ? item : prev_pc;
+	      *endptr = item;
+	      return 1;
+	    }
+	  /* If we see an entry for the specified line,
+	     it gives the beginning.  */
+	  if (line == thisline)
+	    prev_pc = item;
+	  last_pc = item;
+	}
+    }
+  if (prev_pc != -1)
+    {
+      /* If we found the specified line but no later line, it's file's last.
+	 Its range is from line's pc to file's end pc.  */
+      *startptr = last_pc;
+      *endptr = BLOCK_END (BLOCKVECTOR_BLOCK (BLOCKVECTOR (symtab), 0));
+      return 1;
+    }
+
+  return 0;
+}
+
+/* Find the PC value for a given source file and line number.
+   Returns zero for invalid line number.
+   The source file is specified with a struct symtab.  */
+
+CORE_ADDR
+find_line_pc (symtab, line)
+     struct symtab *symtab;
+     int line;
+{
+  register struct linetable *l;
+  register int len;
+  register int i;
+  register int item;
+  register int nextline = -1;
+
+  if (line <= 0)
+    return 0;
+
+  l = LINETABLE (symtab);
+  len = l->nitems;
+  for (i = 0; i < len; i++)
+    {
+      item = l->item[i];
+      if (item < 0)
+	nextline = - item - 1;
+      else
+	{
+	  nextline++;
+	  if (line <= nextline)
+	    return item;
+	}
+    }
+  return 0;
+}
+
+int
+find_pc_line_pc_range (pc, startptr, endptr)
+     CORE_ADDR pc;
+     CORE_ADDR *startptr, *endptr;
+{
+  struct symtab_and_line sal;
+  sal = find_pc_line (pc, 0);
+  *startptr = sal.pc;
+  *endptr = sal.end;
+  return sal.symtab != 0;
+}
+
+/* Parse a string that specifies a line number.
+   Pass the address of a char * variable; that variable will be
+   advanced over the characters actually parsed.
+
+   The string can be:
+
+   LINENUM -- that line number in current file.  PC returned is 0.
+   FILE:LINENUM -- that line in that file.  PC returned is 0.
+   FUNCTION -- line number of openbrace of that function.
+      PC returned is the start of the function.
+   FILE:FUNCTION -- likewise, but prefer functions in that file.
+   *EXPR -- line in which address EXPR appears.
+
+   FUNCTION may be an undebuggable function found in misc_function_vector.
+
+   If the argument FUNFIRSTLINE is nonzero, we want the first line
+   of real code inside a function when a function is specified.
+
+   DEFAULT_SYMTAB specifies the file to use if none is specified.
+   It defaults to current_source_symtab.
+   DEFAULT_LINE specifies the line number to use for relative
+   line numbers (that start with signs).  Defaults to current_source_line.
+
+   Note that it is possible to return zero for the symtab
+   if no file is validly specified.  Callers must check that.
+   Also, the line number returned may be invalid.  */
+
+struct symtab_and_line
+decode_line_1 (argptr, funfirstline, default_symtab, default_line)
+     char **argptr;
+     int funfirstline;
+     struct symtab *default_symtab;
+     int default_line;
+{
+  struct symtab_and_line value;
+  register char *p, *p1;
+  register struct symtab *s;
+  register struct symbol *sym;
+  register CORE_ADDR pc;
+  register int i;
+  char *copy;
+
+  /* Defaults have defaults.  */
+
+  if (default_symtab == 0)
+    {
+      default_symtab = current_source_symtab;
+      default_line = current_source_line;
+    }
+
+  /* See if arg is *PC */
+
+  if (**argptr == '*')
+    {
+      (*argptr)++;
+      pc = parse_and_eval_address_1 (argptr);
+      value = find_pc_line (pc, 0);
+      value.pc = pc;
+      return value;
+    }
+
+  /* Maybe arg is FILE : LINENUM or FILE : FUNCTION */
+
+  s = 0;
+
+  for (p = *argptr; *p; p++)
+    {
+      if (p[0] == ':' || p[0] == ' ' || p[0] == '\t')
+	break;
+    }
+  while (p[0] == ' ' || p[0] == '\t') p++;
+
+  if (p[0] == ':')
+    {
+      /* Extract the file name.  */
+      p1 = p;
+      while (p != *argptr && p[-1] == ' ') --p;
+      copy = (char *) alloca (p - *argptr + 1);
+      bcopy (*argptr, copy, p - *argptr);
+      copy[p - *argptr] = 0;
+
+      /* Find that file's data.  */
+      s = lookup_symtab (copy);
+      if (s == 0)
+	{
+	  if (symtab_list == 0)
+	    error ("No symbol table is loaded.  Use the \"symbol-file\" command.");
+	  error ("No source file named %s.", copy);
+	}
+
+      /* Discard the file name from the arg.  */
+      p = p1 + 1;
+      while (*p == ' ' || *p == '\t') p++;
+      *argptr = p;
+    }
+
+  /* S is specified file's symtab, or 0 if no file specified.
+     arg no longer contains the file name.  */
+
+  /* Check whether arg is all digits (and sign) */
+
+  p = *argptr;
+  if (*p == '-' || *p == '+') p++;
+  while (*p >= '0' && *p <= '9')
+    p++;
+
+  if (p != *argptr && (*p == 0 || *p == ' ' || *p == '\t' || *p == ','))
+    {
+      /* We found a token consisting of all digits -- at least one digit.  */
+      enum sign {none, plus, minus} sign = none;
+
+      if (**argptr == '+')
+	sign = plus, (*argptr)++;
+      else if (**argptr == '-')
+	sign = minus, (*argptr)++;
+      value.line = atoi (*argptr);
+      switch (sign)
+	{
+	case plus:
+	  if (p == *argptr)
+	    value.line = 5;
+	  if (s == 0)
+	    value.line = default_line + value.line;
+	  break;
+	case minus:
+	  if (p == *argptr)
+	    value.line = 15;
+	  if (s == 0)
+	    value.line = default_line - value.line;
+	  else
+	    value.line = 1;
+	  break;
+	}
+
+      while (*p == ' ' || *p == '\t') p++;
+      *argptr = p;
+      if (s == 0)
+	s = default_symtab;
+      value.symtab = s;
+      value.pc = 0;
+      return value;
+    }
+
+  /* Arg token is not digits => try it as a function name
+     Find the next token (everything up to end or next whitespace).  */
+  p = *argptr;
+  while (*p && *p != ' ' && *p != '\t' && *p != ',') p++;
+  copy = (char *) alloca (p - *argptr + 1);
+  bcopy (*argptr, copy, p - *argptr);
+  copy[p - *argptr] = 0;
+  while (*p == ' ' || *p == '\t') p++;
+  *argptr = p;
+
+  /* Look up that token as a function.
+     If file specified, use that file's per-file block to start with.  */
+
+  sym = lookup_symbol (copy, s ? BLOCKVECTOR_BLOCK (BLOCKVECTOR (s), 1) : 0,
+		       VAR_NAMESPACE);
+
+  if (sym && SYMBOL_CLASS (sym) == LOC_BLOCK)
+    {
+      /* Arg is the name of a function */
+      pc = BLOCK_START (SYMBOL_BLOCK_VALUE (sym)) + FUNCTION_START_OFFSET;
+      if (funfirstline)
+	SKIP_PROLOGUE (pc);
+      value = find_pc_line (pc, 0);
+      value.pc = (value.end && value.pc != pc) ? value.end : pc;
+      return value;
+    }
+
+  if (sym)
+    error ("%s is not a function.", copy);
+
+  for (i = 0; i < misc_function_count; i++)
+    if (!strcmp (misc_function_vector[i].name, copy))
+      {
+	value.symtab = 0;
+	value.line = 0;
+	value.pc = misc_function_vector[i].address + FUNCTION_START_OFFSET;
+	if (funfirstline)
+	  SKIP_PROLOGUE (value.pc);
+	return value;
+      }
+
+  if (symtab_list == 0)
+    error ("No symbol table is loaded.  Use the \"symbol-file\" command.");
+  error ("Function %s not defined.", copy);
+}
+
+struct symtab_and_line
+decode_line_spec (string, funfirstline)
+     char *string;
+     int funfirstline;
+{
+  struct symtab_and_line sal;
+  if (string == 0)
+    error ("Empty line specification.");
+  sal = decode_line_1 (&string, funfirstline,
+		       current_source_symtab, current_source_line);
+  if (*string)
+    error ("Junk at end of line specification: %s", string);
+  return sal;
+}
+
+static void
+sources_info ()
+{
+  register struct symtab *s;
+  register int column = 0;
+
+  if (symtab_list == 0)
+    {
+      printf ("No symbol table is loaded.\n");
+      return;
+    }
+  printf ("Source files for which symbol table is known:\n");
+  for (s = symtab_list; s; s = s->next)
+    {
+      if (column != 0 && column + strlen (s->filename) >= 70)
+	{
+	  printf ("\n");
+	  column = 0;
+	}
+      else if (column != 0)
+	{
+	  printf (" ");
+	  column++;
+	}
+      printf ("%s", s->filename);
+      column += strlen (s->filename);
+      if (s->next)
+	{
+	  printf (",");
+	  column++;
+	}
+    }
+  printf ("\n");
+}
+
+/* List all symbols (if REGEXP is 0) or all symbols matching REGEXP.
+   If CLASS is zero, list all symbols except functions and type names.
+   If CLASS is 1, list only functions.
+   If CLASS is 2, list only type names.  */
+
+#define MORE  \
+{ print_count++;		\
+  if (print_count >= 21)	\
+    { printf ("--Type Return to print more--");	\
+      print_count = 0;		\
+      fflush (stdout);		\
+      read_line (); } }
+
+static void
+list_symbols (regexp, class)
+     char *regexp;
+     int class;
+{
+  register struct symtab *s;
+  register struct blockvector *bv;
+  struct blockvector *prev_bv = 0;
+  register struct block *b;
+  register int i, j;
+  register struct symbol *sym;
+  char *val = 0;
+  int found_in_file;
+  static char *classnames[]
+    = {"variable", "function", "type"};
+  int print_count = 0;
+#ifdef REGCMP
+  extern char *regcmp(), *regex(), *loc1;
+#endif
+
+  if (regexp) {
+#ifdef REGCMP
+    val = regcmp(regexp, (char *)0);
+    if (val == 0)
+      error ("Invalid regexp: %s", regexp);
+#else
+    if (val = (char *) re_comp (regexp))
+      error ("Invalid regexp: %s", val);
+#endif
+  }
+
+  printf (regexp
+	  ? "All %ss matching regular expression \"%s\":\n"
+	  : "All defined %ss:\n",
+	  classnames[class],
+	  regexp);
+
+  for (s = symtab_list; s; s = s->next)
+    {
+      found_in_file = 0;
+      bv = BLOCKVECTOR (s);
+      /* Often many files share a blockvector.
+	 Scan each blockvector only once so that
+	 we don't get every symbol many times.
+	 It happens that the first symtab in the list
+	 for any given blockvector is the main file.  */
+      if (bv != prev_bv)
+	for (i = 0; i < 2; i++)
+	  {
+	    b = BLOCKVECTOR_BLOCK (bv, i);
+	    for (j = 0; j < BLOCK_NSYMS (b); j++)
+	      {
+		QUIT;
+		sym = BLOCK_SYM (b, j);
+		if (regexp) {
+#ifdef REGCMP
+		  if (!regex(val, SYMBOL_NAME (sym)))
+		    continue;
+#else
+		  if (!re_exec (SYMBOL_NAME (sym)))
+		    continue;
+#endif
+		}
+		if ((class == 0 && SYMBOL_CLASS (sym) != LOC_TYPEDEF
+			 && SYMBOL_CLASS (sym) != LOC_BLOCK)
+			|| (class == 1 && SYMBOL_CLASS (sym) == LOC_BLOCK)
+			|| (class == 2 && SYMBOL_CLASS (sym) == LOC_TYPEDEF))
+		  {
+		    if (!found_in_file)
+		      {
+			printf ("\nFile %s:\n", s->filename);
+			print_count += 2;
+		      }
+		    found_in_file = 1;
+		    MORE;
+		    if (class != 2 && i == 1)
+		      printf ("static ");
+		    if (class == 2
+			&& SYMBOL_NAMESPACE (sym) != STRUCT_NAMESPACE)
+		      printf ("typedef ");
+
+		    type_print (SYMBOL_TYPE (sym),
+				(SYMBOL_CLASS (sym) == LOC_TYPEDEF
+				 ? "" : SYMBOL_NAME (sym)),
+				stdout, 0);
+		    if (class == 2
+			&& SYMBOL_NAMESPACE (sym) != STRUCT_NAMESPACE
+			&& (TYPE_NAME ((SYMBOL_TYPE (sym))) == 0
+			    || 0 != strcmp (TYPE_NAME ((SYMBOL_TYPE (sym))),
+					    SYMBOL_NAME (sym))))
+		      printf (" %s", SYMBOL_NAME (sym));
+		    printf (";\n");
+		  }
+	      }
+	  }
+      prev_bv = bv;
+    }
+#ifdef REGCMP
+    if (val)
+      (void)free(val);
+#endif
+}
+
+static void
+variables_info (regexp)
+     char *regexp;
+{
+  list_symbols (regexp, 0);
+}
+
+static void
+functions_info (regexp)
+     char *regexp;
+{
+  list_symbols (regexp, 1);
+}
+
+static void
+types_info (regexp)
+     char *regexp;
+{
+  list_symbols (regexp, 2);
+}
+
+/* Initialize the standard C scalar types.  */
+
+static
+struct type *
+init_type (code, length, uns, name)
+     enum type_code code;
+     int length, uns;
+     char *name;
+{
+  register struct type *type;
+
+  type = (struct type *) xmalloc (sizeof (struct type));
+  bzero (type, sizeof *type);
+  TYPE_CODE (type) = code;
+  TYPE_LENGTH (type) = length;
+  TYPE_FLAGS (type) = uns ? TYPE_FLAG_UNSIGNED : 0;
+  TYPE_FLAGS (type) |= TYPE_FLAG_PERM;
+  TYPE_NFIELDS (type) = 0;
+  TYPE_NAME (type) = name;
+
+  return type;
+}
+
+static
+initialize ()
+{
+  add_info ("variables", variables_info,
+	    "All global and static variable names, or those matching REGEXP.");
+  add_info ("functions", functions_info,
+	    "All function names, or those matching REGEXP.");
+  add_info ("types", types_info,
+	    "All types names, or those matching REGEXP.");
+  add_info ("sources", sources_info,
+	    "Source files in the program.");
+
+  obstack_init (symbol_obstack);
+
+  builtin_type_void = init_type (TYPE_CODE_VOID, 0, 0, "void");
+
+  builtin_type_float = init_type (TYPE_CODE_FLT, sizeof (float), 0, "float");
+  builtin_type_double = init_type (TYPE_CODE_FLT, sizeof (double), 0, "double");
+
+  builtin_type_char = init_type (TYPE_CODE_INT, sizeof (char), 0, "char");
+  builtin_type_short = init_type (TYPE_CODE_INT, sizeof (short), 0, "short");
+  builtin_type_long = init_type (TYPE_CODE_INT, sizeof (long), 0, "long");
+  builtin_type_int = init_type (TYPE_CODE_INT, sizeof (int), 0, "int");
+
+  builtin_type_unsigned_char = init_type (TYPE_CODE_INT, sizeof (char), 1, "unsigned char");
+  builtin_type_unsigned_short = init_type (TYPE_CODE_INT, sizeof (short), 1, "unsigned short");
+  builtin_type_unsigned_long = init_type (TYPE_CODE_INT, sizeof (long), 1, "unsigned long");
+  builtin_type_unsigned_int = init_type (TYPE_CODE_INT, sizeof (int), 1, "unsigned int");
+}
+
+END_FILE