Initial revision

1 files changed, 1478 insertions, 0 deletions

diff --git a/gdb/valops.c b/gdb/valops.c
new file mode 100644
index 0000000..8031471
--- /dev/null
+++ b/gdb/valops.c
@@ -0,0 +1,1478 @@
+/* Perform non-arithmetic operations on values, for GDB.
+   Copyright (C) 1986, 1987, 1989 Free Software Foundation, Inc.
+
+This file is part of GDB.
+
+GDB 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.
+
+GDB 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 GDB; see the file COPYING.  If not, write to
+the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.  */
+
+#include <stdio.h>
+#include "defs.h"
+#include "param.h"
+#include "symtab.h"
+#include "value.h"
+#include "frame.h"
+#include "inferior.h"
+#include "gdbcore.h"
+#include "target.h"
+
+#include <errno.h>
+
+/* Local functions.  */
+static value search_struct_field ();
+
+/* Cast value ARG2 to type TYPE and return as a value.
+   More general than a C cast: accepts any two types of the same length,
+   and if ARG2 is an lvalue it can be cast into anything at all.  */
+/* In C++, casts may change pointer representations.  */
+
+value
+value_cast (type, arg2)
+     struct type *type;
+     register value arg2;
+{
+  register enum type_code code1;
+  register enum type_code code2;
+  register int scalar;
+
+  /* Coerce arrays but not enums.  Enums will work as-is
+     and coercing them would cause an infinite recursion.  */
+  if (TYPE_CODE (VALUE_TYPE (arg2)) != TYPE_CODE_ENUM)
+    COERCE_ARRAY (arg2);
+
+  code1 = TYPE_CODE (type);
+  code2 = TYPE_CODE (VALUE_TYPE (arg2));
+  scalar = (code2 == TYPE_CODE_INT || code2 == TYPE_CODE_FLT
+	    || code2 == TYPE_CODE_ENUM);
+
+  if (code1 == TYPE_CODE_FLT && scalar)
+    return value_from_double (type, value_as_double (arg2));
+  else if ((code1 == TYPE_CODE_INT || code1 == TYPE_CODE_ENUM)
+	   && (scalar || code2 == TYPE_CODE_PTR))
+    return value_from_long (type, value_as_long (arg2));
+  else if (TYPE_LENGTH (type) == TYPE_LENGTH (VALUE_TYPE (arg2)))
+    {
+      if (code1 == TYPE_CODE_PTR && code2 == TYPE_CODE_PTR)
+	{
+	  /* Look in the type of the source to see if it contains the
+	     type of the target as a superclass.  If so, we'll need to
+	     offset the pointer rather than just change its type.  */
+	  struct type *t1 = TYPE_TARGET_TYPE (type);
+	  struct type *t2 = TYPE_TARGET_TYPE (VALUE_TYPE (arg2));
+	  if (TYPE_CODE (t1) == TYPE_CODE_STRUCT
+	      && TYPE_CODE (t2) == TYPE_CODE_STRUCT
+	      && TYPE_NAME (t1) != 0) /* if name unknown, can't have supercl */
+	    {
+	      value v = search_struct_field (type_name_no_tag (t1),
+					     value_ind (arg2), 0, t2);
+	      if (v)
+		{
+		  v = value_addr (v);
+		  VALUE_TYPE (v) = type;
+		  return v;
+		}
+	    }
+	  /* No superclass found, just fall through to change ptr type.  */
+	}
+      VALUE_TYPE (arg2) = type;
+      return arg2;
+    }
+  else if (VALUE_LVAL (arg2) == lval_memory)
+    {
+      return value_at_lazy (type, VALUE_ADDRESS (arg2) + VALUE_OFFSET (arg2));
+    }
+  else
+    {
+      error ("Invalid cast.");
+      return 0;
+    }
+}
+
+/* Create a value of type TYPE that is zero, and return it.  */
+
+value
+value_zero (type, lv)
+     struct type *type;
+     enum lval_type lv;
+{
+  register value val = allocate_value (type);
+
+  bzero (VALUE_CONTENTS (val), TYPE_LENGTH (type));
+  VALUE_LVAL (val) = lv;
+
+  return val;
+}
+
+/* Return a value with type TYPE located at ADDR.  
+
+   Call value_at only if the data needs to be fetched immediately;
+   if we can be 'lazy' and defer the fetch, perhaps indefinately, call
+   value_at_lazy instead.  value_at_lazy simply records the address of
+   the data and sets the lazy-evaluation-required flag.  The lazy flag 
+   is tested in the VALUE_CONTENTS macro, which is used if and when 
+   the contents are actually required.  */
+
+value
+value_at (type, addr)
+     struct type *type;
+     CORE_ADDR addr;
+{
+  register value val = allocate_value (type);
+
+  read_memory (addr, VALUE_CONTENTS_RAW (val), TYPE_LENGTH (type));
+
+  VALUE_LVAL (val) = lval_memory;
+  VALUE_ADDRESS (val) = addr;
+
+  return val;
+}
+
+/* Return a lazy value with type TYPE located at ADDR (cf. value_at).  */
+
+value
+value_at_lazy (type, addr)
+     struct type *type;
+     CORE_ADDR addr;
+{
+  register value val = allocate_value (type);
+
+  VALUE_LVAL (val) = lval_memory;
+  VALUE_ADDRESS (val) = addr;
+  VALUE_LAZY (val) = 1;
+
+  return val;
+}
+
+/* Called only from the VALUE_CONTENTS macro, if the current data for
+   a variable needs to be loaded into VALUE_CONTENTS(VAL).  Fetches the
+   data from the user's process, and clears the lazy flag to indicate
+   that the data in the buffer is valid.
+
+   This function returns a value because it is used in the VALUE_CONTENTS
+   macro as part of an expression, where a void would not work.  The
+   value is ignored.  */
+
+int
+value_fetch_lazy (val)
+     register value val;
+{
+  CORE_ADDR addr = VALUE_ADDRESS (val) + VALUE_OFFSET (val);
+
+  read_memory (addr, VALUE_CONTENTS_RAW (val), 
+	       TYPE_LENGTH (VALUE_TYPE (val)));
+  VALUE_LAZY (val) = 0;
+  return 0;
+}
+
+
+/* Store the contents of FROMVAL into the location of TOVAL.
+   Return a new value with the location of TOVAL and contents of FROMVAL.  */
+
+value
+value_assign (toval, fromval)
+     register value toval, fromval;
+{
+  register struct type *type = VALUE_TYPE (toval);
+  register value val;
+  char raw_buffer[MAX_REGISTER_RAW_SIZE];
+  char virtual_buffer[MAX_REGISTER_VIRTUAL_SIZE];
+  int use_buffer = 0;
+
+  COERCE_ARRAY (fromval);
+
+  if (VALUE_LVAL (toval) != lval_internalvar)
+    fromval = value_cast (type, fromval);
+
+  /* If TOVAL is a special machine register requiring conversion
+     of program values to a special raw format,
+     convert FROMVAL's contents now, with result in `raw_buffer',
+     and set USE_BUFFER to the number of bytes to write.  */
+
+  if (VALUE_REGNO (toval) >= 0
+      && REGISTER_CONVERTIBLE (VALUE_REGNO (toval)))
+    {
+      int regno = VALUE_REGNO (toval);
+      if (VALUE_TYPE (fromval) != REGISTER_VIRTUAL_TYPE (regno))
+	fromval = value_cast (REGISTER_VIRTUAL_TYPE (regno), fromval);
+      bcopy (VALUE_CONTENTS (fromval), virtual_buffer,
+	     REGISTER_VIRTUAL_SIZE (regno));
+      target_convert_from_virtual (regno, virtual_buffer, raw_buffer);
+      use_buffer = REGISTER_RAW_SIZE (regno);
+    }
+
+  switch (VALUE_LVAL (toval))
+    {
+    case lval_internalvar:
+      set_internalvar (VALUE_INTERNALVAR (toval), fromval);
+      break;
+
+    case lval_internalvar_component:
+      set_internalvar_component (VALUE_INTERNALVAR (toval),
+				 VALUE_OFFSET (toval),
+				 VALUE_BITPOS (toval),
+				 VALUE_BITSIZE (toval),
+				 fromval);
+      break;
+
+    case lval_memory:
+      if (VALUE_BITSIZE (toval))
+	{
+	  int v;		/* FIXME, this won't work for large bitfields */
+	  read_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
+		       &v, sizeof v);
+	  modify_field (&v, (int) value_as_long (fromval),
+			VALUE_BITPOS (toval), VALUE_BITSIZE (toval));
+	  write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
+			(char *)&v, sizeof v);
+	}
+      else if (use_buffer)
+	write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
+		      raw_buffer, use_buffer);
+      else
+	write_memory (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
+		      VALUE_CONTENTS (fromval), TYPE_LENGTH (type));
+      break;
+
+    case lval_register:
+      if (VALUE_BITSIZE (toval))
+	{
+	  int v;
+
+	  read_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
+			       &v, sizeof v);
+	  modify_field (&v, (int) value_as_long (fromval),
+			VALUE_BITPOS (toval), VALUE_BITSIZE (toval));
+	  write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
+				&v, sizeof v);
+	}
+      else if (use_buffer)
+	write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
+			      raw_buffer, use_buffer);
+      else
+	write_register_bytes (VALUE_ADDRESS (toval) + VALUE_OFFSET (toval),
+			      VALUE_CONTENTS (fromval), TYPE_LENGTH (type));
+      break;
+
+    case lval_reg_frame_relative:
+      {
+	/* value is stored in a series of registers in the frame
+	   specified by the structure.  Copy that value out, modify
+	   it, and copy it back in.  */
+	int amount_to_copy = (VALUE_BITSIZE (toval) ? 1 : TYPE_LENGTH (type));
+	int reg_size = REGISTER_RAW_SIZE (VALUE_FRAME_REGNUM (toval));
+	int byte_offset = VALUE_OFFSET (toval) % reg_size;
+	int reg_offset = VALUE_OFFSET (toval) / reg_size;
+	int amount_copied;
+	char *buffer = (char *) alloca (amount_to_copy);
+	int regno;
+	FRAME frame;
+
+	/* Figure out which frame this is in currently.  */
+	for (frame = get_current_frame ();
+	     frame && FRAME_FP (frame) != VALUE_FRAME (toval);
+	     frame = get_prev_frame (frame))
+	  ;
+
+	if (!frame)
+	  error ("Value being assigned to is no longer active.");
+
+	amount_to_copy += (reg_size - amount_to_copy % reg_size);
+
+	/* Copy it out.  */
+	for ((regno = VALUE_FRAME_REGNUM (toval) + reg_offset,
+	      amount_copied = 0);
+	     amount_copied < amount_to_copy;
+	     amount_copied += reg_size, regno++)
+	  {
+	    get_saved_register (buffer + amount_copied,
+				(int *)NULL, (CORE_ADDR)NULL,
+				frame, regno, (enum lval_type *)NULL);
+	  }
+
+	/* Modify what needs to be modified.  */
+	if (VALUE_BITSIZE (toval))
+	  modify_field (buffer + byte_offset,
+			(int) value_as_long (fromval),
+			VALUE_BITPOS (toval), VALUE_BITSIZE (toval));
+	else if (use_buffer)
+	  bcopy (raw_buffer, buffer + byte_offset, use_buffer);
+	else
+	  bcopy (VALUE_CONTENTS (fromval), buffer + byte_offset,
+		 TYPE_LENGTH (type));
+
+	/* Copy it back.  */
+	for ((regno = VALUE_FRAME_REGNUM (toval) + reg_offset,
+	      amount_copied = 0);
+	     amount_copied < amount_to_copy;
+	     amount_copied += reg_size, regno++)
+	  {
+	    enum lval_type lval;
+	    CORE_ADDR addr;
+	    int optim;
+
+	    /* Just find out where to put it.  */
+	    get_saved_register ((char *)NULL,
+			        &optim, &addr, frame, regno, &lval);
+	    
+	    if (optim)
+	      error ("Attempt to assign to a value that was optimized out.");
+	    if (lval == lval_memory)
+	      write_memory (addr, buffer + amount_copied, reg_size);
+	    else if (lval == lval_register)
+	      write_register_bytes (addr, buffer + amount_copied, reg_size);
+	    else
+	      error ("Attempt to assign to an unmodifiable value.");
+	  }
+      }
+      break;
+	
+
+    default:
+      error ("Left side of = operation is not an lvalue.");
+    }
+
+  /* Return a value just like TOVAL except with the contents of FROMVAL
+     (except in the case of the type if TOVAL is an internalvar).  */
+
+  if (VALUE_LVAL (toval) == lval_internalvar
+      || VALUE_LVAL (toval) == lval_internalvar_component)
+    {
+      type = VALUE_TYPE (fromval);
+    }
+
+  val = allocate_value (type);
+  bcopy (toval, val, VALUE_CONTENTS_RAW (val) - (char *) val);
+  bcopy (VALUE_CONTENTS (fromval), VALUE_CONTENTS_RAW (val), TYPE_LENGTH (type));
+  VALUE_TYPE (val) = type;
+  
+  return val;
+}
+
+/* Extend a value VAL to COUNT repetitions of its type.  */
+
+value
+value_repeat (arg1, count)
+     value arg1;
+     int count;
+{
+  register value val;
+
+  if (VALUE_LVAL (arg1) != lval_memory)
+    error ("Only values in memory can be extended with '@'.");
+  if (count < 1)
+    error ("Invalid number %d of repetitions.", count);
+
+  val = allocate_repeat_value (VALUE_TYPE (arg1), count);
+
+  read_memory (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1),
+	       VALUE_CONTENTS_RAW (val),
+	       TYPE_LENGTH (VALUE_TYPE (val)) * count);
+  VALUE_LVAL (val) = lval_memory;
+  VALUE_ADDRESS (val) = VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1);
+
+  return val;
+}
+
+value
+value_of_variable (var)
+     struct symbol *var;
+{
+  value val;
+
+  val = read_var_value (var, (FRAME) 0);
+  if (val == 0)
+    error ("Address of symbol \"%s\" is unknown.", SYMBOL_NAME (var));
+  return val;
+}
+
+/* Given a value which is an array, return a value which is
+   a pointer to its first element.  */
+
+value
+value_coerce_array (arg1)
+     value arg1;
+{
+  register struct type *type;
+  register value val;
+
+  if (VALUE_LVAL (arg1) != lval_memory)
+    error ("Attempt to take address of value not located in memory.");
+
+  /* Get type of elements.  */
+  if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_ARRAY)
+    type = TYPE_TARGET_TYPE (VALUE_TYPE (arg1));
+  else
+    /* A phony array made by value_repeat.
+       Its type is the type of the elements, not an array type.  */
+    type = VALUE_TYPE (arg1);
+
+  /* Get the type of the result.  */
+  type = lookup_pointer_type (type);
+  val = value_from_long (builtin_type_long,
+		       (LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1)));
+  VALUE_TYPE (val) = type;
+  return val;
+}
+
+/* Given a value which is a function, return a value which is a pointer
+   to it.  */
+
+value
+value_coerce_function (arg1)
+     value arg1;
+{
+  register struct type *type;
+  register value val;
+
+  if (VALUE_LVAL (arg1) != lval_memory)
+    error ("Attempt to take address of value not located in memory.");
+
+  /* Get the type of the result.  */
+  type = lookup_pointer_type (VALUE_TYPE (arg1));
+  val = value_from_long (builtin_type_long,
+		(LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1)));
+  VALUE_TYPE (val) = type;
+  return val;
+}  
+
+/* Return a pointer value for the object for which ARG1 is the contents.  */
+
+value
+value_addr (arg1)
+     value arg1;
+{
+  register struct type *type;
+  register value val;
+
+  COERCE_REF(arg1);
+  /* Taking the address of an array is really a no-op
+     once the array is coerced to a pointer to its first element.  */
+  if (VALUE_REPEATED (arg1)
+      || TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_ARRAY)
+    return value_coerce_array (arg1);
+  if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_FUNC)
+    return value_coerce_function (arg1);
+
+  if (VALUE_LVAL (arg1) != lval_memory)
+    error ("Attempt to take address of value not located in memory.");
+
+  /* Get the type of the result.  */
+  type = lookup_pointer_type (VALUE_TYPE (arg1));
+  val = value_from_long (builtin_type_long,
+		(LONGEST) (VALUE_ADDRESS (arg1) + VALUE_OFFSET (arg1)));
+  VALUE_TYPE (val) = type;
+  return val;
+}
+
+/* Given a value of a pointer type, apply the C unary * operator to it.  */
+
+value
+value_ind (arg1)
+     value arg1;
+{
+  COERCE_ARRAY (arg1);
+
+  if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_MEMBER)
+    error ("not implemented: member types in value_ind");
+
+  /* Allow * on an integer so we can cast it to whatever we want.
+     This returns an int, which seems like the most C-like thing
+     to do.  "long long" variables are rare enough that
+     BUILTIN_TYPE_LONGEST would seem to be a mistake.  */
+  if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_INT)
+    return value_at (builtin_type_int,
+		     (CORE_ADDR) value_as_long (arg1));
+  else if (TYPE_CODE (VALUE_TYPE (arg1)) == TYPE_CODE_PTR)
+    return value_at_lazy (TYPE_TARGET_TYPE (VALUE_TYPE (arg1)),
+		     (CORE_ADDR) value_as_long (arg1));
+  error ("Attempt to take contents of a non-pointer value.");
+  return 0;  /* For lint -- never reached */
+}
+
+/* Pushing small parts of stack frames.  */
+
+/* Push one word (the size of object that a register holds).  */
+
+CORE_ADDR
+push_word (sp, buffer)
+     CORE_ADDR sp;
+     REGISTER_TYPE buffer;
+{
+  register int len = sizeof (REGISTER_TYPE);
+
+#if 1 INNER_THAN 2
+  sp -= len;
+  write_memory (sp, (char *)&buffer, len);
+#else /* stack grows upward */
+  write_memory (sp, (char *)&buffer, len);
+  sp += len;
+#endif /* stack grows upward */
+
+  return sp;
+}
+
+/* Push LEN bytes with data at BUFFER.  */
+
+CORE_ADDR
+push_bytes (sp, buffer, len)
+     CORE_ADDR sp;
+     char *buffer;
+     int len;
+{
+#if 1 INNER_THAN 2
+  sp -= len;
+  write_memory (sp, buffer, len);
+#else /* stack grows upward */
+  write_memory (sp, buffer, len);
+  sp += len;
+#endif /* stack grows upward */
+
+  return sp;
+}
+
+/* Push onto the stack the specified value VALUE.  */
+
+CORE_ADDR
+value_push (sp, arg)
+     register CORE_ADDR sp;
+     value arg;
+{
+  register int len = TYPE_LENGTH (VALUE_TYPE (arg));
+
+#if 1 INNER_THAN 2
+  sp -= len;
+  write_memory (sp, VALUE_CONTENTS (arg), len);
+#else /* stack grows upward */
+  write_memory (sp, VALUE_CONTENTS (arg), len);
+  sp += len;
+#endif /* stack grows upward */
+
+  return sp;
+}
+
+/* Perform the standard coercions that are specified
+   for arguments to be passed to C functions.  */
+
+value
+value_arg_coerce (arg)
+     value arg;
+{
+  register struct type *type;
+
+  COERCE_ENUM (arg);
+
+  type = VALUE_TYPE (arg);
+
+  if (TYPE_CODE (type) == TYPE_CODE_INT
+      && TYPE_LENGTH (type) < sizeof (int))
+    return value_cast (builtin_type_int, arg);
+
+  if (type == builtin_type_float)
+    return value_cast (builtin_type_double, arg);
+
+  return arg;
+}
+
+/* Push the value ARG, first coercing it as an argument
+   to a C function.  */
+
+CORE_ADDR
+value_arg_push (sp, arg)
+     register CORE_ADDR sp;
+     value arg;
+{
+  return value_push (sp, value_arg_coerce (arg));
+}
+
+/* Determine a function's address and its return type from its value. 
+   Calls error() if the function is not valid for calling.  */
+
+CORE_ADDR
+find_function_addr (function, retval_type)
+     value function;
+     struct type **retval_type;
+{
+  register struct type *ftype = VALUE_TYPE (function);
+  register enum type_code code = TYPE_CODE (ftype);
+  struct type *value_type;
+  CORE_ADDR funaddr;
+
+  /* If it's a member function, just look at the function
+     part of it.  */
+
+  /* Determine address to call.  */
+  if (code == TYPE_CODE_FUNC || code == TYPE_CODE_METHOD)
+    {
+      funaddr = VALUE_ADDRESS (function);
+      value_type = TYPE_TARGET_TYPE (ftype);
+    }
+  else if (code == TYPE_CODE_PTR)
+    {
+      funaddr = value_as_long (function);
+      if (TYPE_CODE (TYPE_TARGET_TYPE (ftype)) == TYPE_CODE_FUNC
+	  || TYPE_CODE (TYPE_TARGET_TYPE (ftype)) == TYPE_CODE_METHOD)
+	value_type = TYPE_TARGET_TYPE (TYPE_TARGET_TYPE (ftype));
+      else
+	value_type = builtin_type_int;
+    }
+  else if (code == TYPE_CODE_INT)
+    {
+      /* Handle the case of functions lacking debugging info.
+	 Their values are characters since their addresses are char */
+      if (TYPE_LENGTH (ftype) == 1)
+	funaddr = value_as_long (value_addr (function));
+      else
+	/* Handle integer used as address of a function.  */
+	funaddr = value_as_long (function);
+
+      value_type = builtin_type_int;
+    }
+  else
+    error ("Invalid data type for function to be called.");
+
+  *retval_type = value_type;
+  return funaddr;
+}
+
+#if defined (CALL_DUMMY)
+/* All this stuff with a dummy frame may seem unnecessarily complicated
+   (why not just save registers in GDB?).  The purpose of pushing a dummy
+   frame which looks just like a real frame is so that if you call a
+   function and then hit a breakpoint (get a signal, etc), "backtrace"
+   will look right.  Whether the backtrace needs to actually show the
+   stack at the time the inferior function was called is debatable, but
+   it certainly needs to not display garbage.  So if you are contemplating
+   making dummy frames be different from normal frames, consider that.  */
+
+/* Perform a function call in the inferior.
+   ARGS is a vector of values of arguments (NARGS of them).
+   FUNCTION is a value, the function to be called.
+   Returns a value representing what the function returned.
+   May fail to return, if a breakpoint or signal is hit
+   during the execution of the function.  */
+
+value
+call_function_by_hand (function, nargs, args)
+     value function;
+     int nargs;
+     value *args;
+{
+  register CORE_ADDR sp;
+  register int i;
+  CORE_ADDR start_sp;
+  static REGISTER_TYPE dummy[] = CALL_DUMMY;
+  REGISTER_TYPE dummy1[sizeof dummy / sizeof (REGISTER_TYPE)];
+  CORE_ADDR old_sp;
+  struct type *value_type;
+  unsigned char struct_return;
+  CORE_ADDR struct_addr;
+  struct inferior_status inf_status;
+  struct cleanup *old_chain;
+  CORE_ADDR funaddr;
+  int using_gcc;
+
+  save_inferior_status (&inf_status, 1);
+  old_chain = make_cleanup (restore_inferior_status, &inf_status);
+
+  /* PUSH_DUMMY_FRAME is responsible for saving the inferior registers
+     (and POP_FRAME for restoring them).  (At least on most machines)
+     they are saved on the stack in the inferior.  */
+  PUSH_DUMMY_FRAME;
+
+  old_sp = sp = read_register (SP_REGNUM);
+
+#if 1 INNER_THAN 2		/* Stack grows down */
+  sp -= sizeof dummy;
+  start_sp = sp;
+#else				/* Stack grows up */
+  start_sp = sp;
+  sp += sizeof dummy;
+#endif
+
+  funaddr = find_function_addr (function, &value_type);
+
+  {
+    struct block *b = block_for_pc (funaddr);
+    /* If compiled without -g, assume GCC.  */
+    using_gcc = b == NULL || BLOCK_GCC_COMPILED (b);
+  }
+
+  /* Are we returning a value using a structure return or a normal
+     value return? */
+
+  struct_return = using_struct_return (function, funaddr, value_type,
+				       using_gcc);
+
+  /* Create a call sequence customized for this function
+     and the number of arguments for it.  */
+  bcopy (dummy, dummy1, sizeof dummy);
+  FIX_CALL_DUMMY (dummy1, start_sp, funaddr, nargs, args,
+		  value_type, using_gcc);
+
+#if CALL_DUMMY_LOCATION == ON_STACK
+  write_memory (start_sp, (char *)dummy1, sizeof dummy);
+
+#else /* Not on stack.  */
+#if CALL_DUMMY_LOCATION == BEFORE_TEXT_END
+  /* Convex Unix prohibits executing in the stack segment. */
+  /* Hope there is empty room at the top of the text segment. */
+  {
+    static checked = 0;
+    if (!checked)
+      for (start_sp = text_end - sizeof dummy; start_sp < text_end; ++start_sp)
+	if (read_memory_integer (start_sp, 1) != 0)
+	  error ("text segment full -- no place to put call");
+    checked = 1;
+    sp = old_sp;
+    start_sp = text_end - sizeof dummy;
+    write_memory (start_sp, (char *)dummy1, sizeof dummy);
+  }
+#else /* After text_end.  */
+  {
+    int errcode;
+    sp = old_sp;
+    start_sp = text_end;
+    errcode = target_write_memory (start_sp, (char *)dummy1, sizeof dummy);
+    if (errcode != 0)
+      error ("Cannot write text segment -- call_function failed");
+  }
+#endif /* After text_end.  */
+#endif /* Not on stack.  */
+
+#ifdef lint
+  sp = old_sp;		/* It really is used, for some ifdef's... */
+#endif
+
+#ifdef STACK_ALIGN
+  /* If stack grows down, we must leave a hole at the top. */
+  {
+    int len = 0;
+
+    /* Reserve space for the return structure to be written on the
+       stack, if necessary */
+
+    if (struct_return)
+      len += TYPE_LENGTH (value_type);
+    
+    for (i = nargs - 1; i >= 0; i--)
+      len += TYPE_LENGTH (VALUE_TYPE (value_arg_coerce (args[i])));
+#ifdef CALL_DUMMY_STACK_ADJUST
+    len += CALL_DUMMY_STACK_ADJUST;
+#endif
+#if 1 INNER_THAN 2
+    sp -= STACK_ALIGN (len) - len;
+#else
+    sp += STACK_ALIGN (len) - len;
+#endif
+  }
+#endif /* STACK_ALIGN */
+
+    /* Reserve space for the return structure to be written on the
+       stack, if necessary */
+
+    if (struct_return)
+      {
+#if 1 INNER_THAN 2
+	sp -= TYPE_LENGTH (value_type);
+	struct_addr = sp;
+#else
+	struct_addr = sp;
+	sp += TYPE_LENGTH (value_type);
+#endif
+      }
+
+#if defined (REG_STRUCT_HAS_ADDR)
+  {
+    /* This is a machine like the sparc, where we need to pass a pointer
+       to the structure, not the structure itself.  */
+    if (REG_STRUCT_HAS_ADDR (using_gcc))
+      for (i = nargs - 1; i >= 0; i--)
+	if (TYPE_CODE (VALUE_TYPE (args[i])) == TYPE_CODE_STRUCT)
+	  {
+	    CORE_ADDR addr;
+#if !(1 INNER_THAN 2)
+	    /* The stack grows up, so the address of the thing we push
+	       is the stack pointer before we push it.  */
+	    addr = sp;
+#endif
+	    /* Push the structure.  */
+	    sp = value_push (sp, args[i]);
+#if 1 INNER_THAN 2
+	    /* The stack grows down, so the address of the thing we push
+	       is the stack pointer after we push it.  */
+	    addr = sp;
+#endif
+	    /* The value we're going to pass is the address of the thing
+	       we just pushed.  */
+	    args[i] = value_from_long (builtin_type_long, (LONGEST) addr);
+	  }
+  }
+#endif /* REG_STRUCT_HAS_ADDR.  */
+
+#ifdef PUSH_ARGUMENTS
+  PUSH_ARGUMENTS(nargs, args, sp, struct_return, struct_addr);
+#else /* !PUSH_ARGUMENTS */
+  for (i = nargs - 1; i >= 0; i--)
+    sp = value_arg_push (sp, args[i]);
+#endif /* !PUSH_ARGUMENTS */
+
+#ifdef CALL_DUMMY_STACK_ADJUST
+#if 1 INNER_THAN 2
+  sp -= CALL_DUMMY_STACK_ADJUST;
+#else
+  sp += CALL_DUMMY_STACK_ADJUST;
+#endif
+#endif /* CALL_DUMMY_STACK_ADJUST */
+
+  /* Store the address at which the structure is supposed to be
+     written.  Note that this (and the code which reserved the space
+     above) assumes that gcc was used to compile this function.  Since
+     it doesn't cost us anything but space and if the function is pcc
+     it will ignore this value, we will make that assumption.
+
+     Also note that on some machines (like the sparc) pcc uses a 
+     convention like gcc's.  */
+
+  if (struct_return)
+    STORE_STRUCT_RETURN (struct_addr, sp);
+
+  /* Write the stack pointer.  This is here because the statements above
+     might fool with it.  On SPARC, this write also stores the register
+     window into the right place in the new stack frame, which otherwise
+     wouldn't happen.  (See write_inferior_registers in sparc-xdep.c.)  */
+  write_register (SP_REGNUM, sp);
+
+  /* Figure out the value returned by the function.  */
+  {
+    char retbuf[REGISTER_BYTES];
+
+    /* Execute the stack dummy routine, calling FUNCTION.
+       When it is done, discard the empty frame
+       after storing the contents of all regs into retbuf.  */
+    run_stack_dummy (start_sp + CALL_DUMMY_START_OFFSET, retbuf);
+
+    do_cleanups (old_chain);
+
+    return value_being_returned (value_type, retbuf, struct_return);
+  }
+}
+#else /* no CALL_DUMMY.  */
+value
+call_function_by_hand (function, nargs, args)
+     value function;
+     int nargs;
+     value *args;
+{
+  error ("Cannot invoke functions on this machine.");
+}
+#endif /* no CALL_DUMMY.  */
+
+/* Create a value for a string constant:
+   Call the function malloc in the inferior to get space for it,
+   then copy the data into that space
+   and then return the address with type char *.
+   PTR points to the string constant data; LEN is number of characters.  */
+
+value
+value_string (ptr, len)
+     char *ptr;
+     int len;
+{
+  register value val;
+  register struct symbol *sym;
+  value blocklen;
+  register char *copy = (char *) alloca (len + 1);
+  char *i = ptr;
+  register char *o = copy, *ibeg = ptr;
+  register int c;
+
+  /* Copy the string into COPY, processing escapes.
+     We could not conveniently process them in expread
+     because the string there wants to be a substring of the input.  */
+
+  while (i - ibeg < len)
+    {
+      c = *i++;
+      if (c == '\\')
+	{
+	  c = parse_escape (&i);
+	  if (c == -1)
+	    continue;
+	}
+      *o++ = c;
+    }
+  *o = 0;
+
+  /* Get the length of the string after escapes are processed.  */
+
+  len = o - copy;
+
+  /* Find the address of malloc in the inferior.  */
+
+  sym = lookup_symbol ("malloc", 0, VAR_NAMESPACE, 0, NULL);
+  if (sym != 0)
+    {
+      if (SYMBOL_CLASS (sym) != LOC_BLOCK)
+	error ("\"malloc\" exists in this program but is not a function.");
+      val = value_of_variable (sym);
+    }
+  else
+    {
+      register int j;
+      for (j = 0; j < misc_function_count; j++)
+	if (!strcmp (misc_function_vector[j].name, "malloc"))
+	  break;
+      if (j < misc_function_count)
+	val = value_from_long (builtin_type_long,
+			     (LONGEST) misc_function_vector[j].address);
+      else
+	error ("String constants require the program to have a function \"malloc\".");
+    }
+
+  blocklen = value_from_long (builtin_type_int, (LONGEST) (len + 1));
+  val = target_call_function (val, 1, &blocklen);
+  if (value_zerop (val))
+    error ("No memory available for string constant.");
+  write_memory ((CORE_ADDR) value_as_long (val), copy, len + 1);
+  VALUE_TYPE (val) = lookup_pointer_type (builtin_type_char);
+  return val;
+}
+
+/* Helper function used by value_struct_elt to recurse through baseclasses.
+   Look for a field NAME in ARG1. Adjust the address of ARG1 by OFFSET bytes,
+   and treat the result as having type TYPE.
+   If found, return value, else return NULL. */
+
+static value
+search_struct_field (name, arg1, offset, type)
+     char *name;
+     register value arg1;
+     int offset;
+     register struct type *type;
+{
+  int i;
+
+  check_stub_type (type);
+
+  for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--)
+    {
+      char *t_field_name = TYPE_FIELD_NAME (type, i);
+      if (t_field_name && !strcmp (t_field_name, name))
+	  return TYPE_FIELD_STATIC (type, i)
+	      ? value_static_field (type, name, i)
+	      : value_primitive_field (arg1, offset, i, type);
+    }
+
+  for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
+    {
+      value v;
+      /* If we are looking for baseclasses, this is what we get when we
+	 hit them.  */
+      int found_baseclass = !strcmp (name, TYPE_BASECLASS_NAME (type, i));
+
+      if (BASETYPE_VIA_VIRTUAL (type, i))
+	{
+	  value v2;
+	  baseclass_addr (type, i, VALUE_CONTENTS (arg1) + offset, &v2);
+	  if (v2 == 0)
+	    error ("virtual baseclass botch");
+	  if (found_baseclass)
+	    return v2;
+	  v = search_struct_field (name, v2, 0, TYPE_BASECLASS (type, i));
+	  if (v) return v;
+	  else continue;
+	}
+      if (found_baseclass)
+	v = value_primitive_field (arg1, offset, i, type);
+      else
+	v = search_struct_field (name, arg1,
+				 offset + TYPE_BASECLASS_BITPOS (type, i) / 8,
+				 TYPE_BASECLASS (type, i));
+      if (v) return v;
+    }
+  return NULL;
+}
+
+/* Helper function used by value_struct_elt to recurse through baseclasses.
+   Look for a field NAME in ARG1. Adjust the address of ARG1 by OFFSET bytes,
+   and treat the result as having type TYPE.
+   If found, return value, else return NULL. */
+
+static value
+search_struct_method (name, arg1, args, offset, static_memfuncp, type)
+     char *name;
+     register value arg1, *args;
+     int offset, *static_memfuncp;
+     register struct type *type;
+{
+  int i;
+
+  check_stub_type (type);
+  for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; i--)
+    {
+      char *t_field_name = TYPE_FN_FIELDLIST_NAME (type, i);
+      if (t_field_name && !strcmp (t_field_name, name))
+	{
+	  int j;
+	  struct fn_field *f = TYPE_FN_FIELDLIST1 (type, i);
+
+	  for (j = TYPE_FN_FIELDLIST_LENGTH (type, i) - 1; j >= 0; --j)
+	    {
+	      if (TYPE_FLAGS (TYPE_FN_FIELD_TYPE (f, j)) & TYPE_FLAG_STUB)
+		check_stub_method (type, i, j);
+	      if (!typecmp (TYPE_FN_FIELD_STATIC_P (f, j),
+			    TYPE_FN_FIELD_ARGS (f, j), args))
+		{
+		  if (TYPE_FN_FIELD_VIRTUAL_P (f, j))
+		    return (value)value_virtual_fn_field (arg1, f, j);
+		  if (TYPE_FN_FIELD_STATIC_P (f, j) && static_memfuncp)
+		    *static_memfuncp = 1;
+		  return (value)value_fn_field (arg1, i, j);
+		}
+	    }
+	}
+    }
+
+  for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
+    {
+      value v;
+
+      if (BASETYPE_VIA_VIRTUAL (type, i))
+	{
+	  value v2;
+	  baseclass_addr (type, i, VALUE_CONTENTS (arg1) + offset, &v2);
+	  if (v2 == 0)
+	    error ("virtual baseclass botch");
+	  v = search_struct_method (name, v2, args, 0,
+				    static_memfuncp, TYPE_BASECLASS (type, i));
+	  if (v) return v;
+	  else continue;
+	}
+
+      v = search_struct_method (name, arg1, args,
+				TYPE_BASECLASS_BITPOS (type, i) / 8,
+				static_memfuncp, TYPE_BASECLASS (type, i));
+      if (v) return v;
+    }
+  return NULL;
+}
+
+/* Given *ARGP, a value of type (pointer to a)* structure/union,
+   extract the component named NAME from the ultimate target structure/union
+   and return it as a value with its appropriate type.
+   ERR is used in the error message if *ARGP's type is wrong.
+
+   C++: ARGS is a list of argument types to aid in the selection of
+   an appropriate method. Also, handle derived types.
+
+   STATIC_MEMFUNCP, if non-NULL, points to a caller-supplied location
+   where the truthvalue of whether the function that was resolved was
+   a static member function or not is stored.
+
+   ERR is an error message to be printed in case the field is not found.  */
+
+value
+value_struct_elt (argp, args, name, static_memfuncp, err)
+     register value *argp, *args;
+     char *name;
+     int *static_memfuncp;
+     char *err;
+{
+  register struct type *t;
+  int found = 0;	/* FIXME, half the time this doesn't get set */
+  value arg1_as_ptr = *argp;	/* FIXME, set but not used! */
+  value v;
+
+  COERCE_ARRAY (*argp);
+
+  t = VALUE_TYPE (*argp);
+
+  /* Follow pointers until we get to a non-pointer.  */
+
+  while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF)
+    {
+      arg1_as_ptr = *argp;
+      *argp = value_ind (*argp);
+      COERCE_ARRAY (*argp);
+      t = VALUE_TYPE (*argp);
+    }
+
+  if (TYPE_CODE (t) == TYPE_CODE_MEMBER)
+    error ("not implemented: member type in value_struct_elt");
+
+  if (TYPE_CODE (t) != TYPE_CODE_STRUCT
+      && TYPE_CODE (t) != TYPE_CODE_UNION)
+    error ("Attempt to extract a component of a value that is not a %s.", err);
+
+  /* Assume it's not, unless we see that it is.  */
+  if (static_memfuncp)
+    *static_memfuncp =0;
+
+  if (!args)
+    {
+      /* if there are no arguments ...do this...  */
+
+      /* Try as a variable first, because if we succeed, there
+	 is less work to be done.  */
+      v = search_struct_field (name, *argp, 0, t);
+      if (v)
+	return v;
+
+      /* C++: If it was not found as a data field, then try to
+         return it as a pointer to a method.  */
+
+      if (destructor_name_p (name, t))
+	error ("Cannot get value of destructor");
+
+      v = search_struct_method (name, *argp, args, 0, static_memfuncp, t);
+
+      if (v == 0)
+	{
+	  if (TYPE_NFN_FIELDS (t))
+	    error ("There is no member or method named %s.", name);
+	  else
+	    error ("There is no member named %s.", name);
+	}
+      return v;
+    }
+
+  if (destructor_name_p (name, t))
+    {
+      if (!args[1])
+	{
+	  /* destructors are a special case.  */
+	  return (value)value_fn_field (*argp, 0,
+					TYPE_FN_FIELDLIST_LENGTH (t, 0));
+	}
+      else
+	{
+	  error ("destructor should not have any argument");
+	}
+    }
+  else
+    v = search_struct_method (name, *argp, args, 0, static_memfuncp, t);
+
+  if (v == 0)
+    {
+      /* See if user tried to invoke data as function.  If so,
+	 hand it back.  If it's not callable (i.e., a pointer to function),
+	 gdb should give an error.  */
+      v = search_struct_field (name, *argp, 0, t);
+    }
+
+  if (!v)
+    error ("Structure has no component named %s.", name);
+  return v;
+}
+
+/* C++: return 1 is NAME is a legitimate name for the destructor
+   of type TYPE.  If TYPE does not have a destructor, or
+   if NAME is inappropriate for TYPE, an error is signaled.  */
+int
+destructor_name_p (name, type)
+     char *name;
+     struct type *type;
+{
+  /* destructors are a special case.  */
+
+  if (name[0] == '~')
+    {
+      char *dname = type_name_no_tag (type);
+
+      if (! TYPE_HAS_DESTRUCTOR (type))
+	error ("type `%s' does not have destructor defined", dname);
+      if (strcmp (dname, name+1))
+	error ("name of destructor must equal name of class");
+      else
+	return 1;
+    }
+  return 0;
+}
+
+/* Helper function for check_field: Given TYPE, a structure/union,
+   return 1 if the component named NAME from the ultimate
+   target structure/union is defined, otherwise, return 0. */
+
+static int
+check_field_in (type, name)
+     register struct type *type;
+     char *name;
+{
+  register int i;
+
+  for (i = TYPE_NFIELDS (type) - 1; i >= TYPE_N_BASECLASSES (type); i--)
+    {
+      char *t_field_name = TYPE_FIELD_NAME (type, i);
+      if (t_field_name && !strcmp (t_field_name, name))
+	return 1;
+    }
+
+  /* C++: If it was not found as a data field, then try to
+     return it as a pointer to a method.  */
+
+  /* Destructors are a special case.  */
+  if (destructor_name_p (name, type))
+    return 1;
+
+  for (i = TYPE_NFN_FIELDS (type) - 1; i >= 0; --i)
+    {
+      if (!strcmp (TYPE_FN_FIELDLIST_NAME (type, i), name))
+	return 1;
+    }
+
+  for (i = TYPE_N_BASECLASSES (type) - 1; i >= 0; i--)
+    if (check_field_in (TYPE_BASECLASS (type, i), name))
+      return 1;
+      
+  return 0;
+}
+
+
+/* C++: Given ARG1, a value of type (pointer to a)* structure/union,
+   return 1 if the component named NAME from the ultimate
+   target structure/union is defined, otherwise, return 0.  */
+
+int
+check_field (arg1, name)
+     register value arg1;
+     char *name;
+{
+  register struct type *t;
+
+  COERCE_ARRAY (arg1);
+
+  t = VALUE_TYPE (arg1);
+
+  /* Follow pointers until we get to a non-pointer.  */
+
+  while (TYPE_CODE (t) == TYPE_CODE_PTR || TYPE_CODE (t) == TYPE_CODE_REF)
+    t = TYPE_TARGET_TYPE (t);
+
+  if (TYPE_CODE (t) == TYPE_CODE_MEMBER)
+    error ("not implemented: member type in check_field");
+
+  if (TYPE_CODE (t) != TYPE_CODE_STRUCT
+      && TYPE_CODE (t) != TYPE_CODE_UNION)
+    error ("Internal error: `this' is not an aggregate");
+
+  return check_field_in (t, name);
+}
+
+/* C++: Given an aggregate type DOMAIN, and a member name NAME,
+   return the address of this member as a pointer to member
+   type.  If INTYPE is non-null, then it will be the type
+   of the member we are looking for.  This will help us resolve
+   pointers to member functions.  */
+
+value
+value_struct_elt_for_address (domain, intype, name)
+     struct type *domain, *intype;
+     char *name;
+{
+  register struct type *t = domain;
+  register int i;
+  value v;
+
+  struct type *baseclass;
+
+  if (TYPE_CODE (t) != TYPE_CODE_STRUCT
+      && TYPE_CODE (t) != TYPE_CODE_UNION)
+    error ("Internal error: non-aggregate type to value_struct_elt_for_address");
+
+  baseclass = t;
+
+  while (t)
+    {
+      for (i = TYPE_NFIELDS (t) - 1; i >= TYPE_N_BASECLASSES (t); i--)
+	{
+	  char *t_field_name = TYPE_FIELD_NAME (t, i);
+	  if (t_field_name && !strcmp (t_field_name, name))
+	    {
+	      if (TYPE_FIELD_STATIC (t, i))
+		{
+		  char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (t, i);
+		  struct symbol *sym =
+		      lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL);
+		  if (! sym) error ("Internal error: could not find physical static variable named %s", phys_name);
+		  v = value_from_long(builtin_type_long,
+				      (CORE_ADDR)SYMBOL_BLOCK_VALUE (sym));
+		  VALUE_TYPE(v) = lookup_pointer_type (TYPE_FIELD_TYPE (t, i));
+		  return v;
+	        }
+	      if (TYPE_FIELD_PACKED (t, i))
+		error ("pointers to bitfield members not allowed");
+
+	      v = value_from_long (builtin_type_int,
+				   (LONGEST) (TYPE_FIELD_BITPOS (t, i) >> 3));
+	      VALUE_TYPE (v)
+		= lookup_pointer_type (lookup_member_type (TYPE_FIELD_TYPE (t, i), baseclass));
+	      return v;
+	    }
+	}
+
+      if (TYPE_N_BASECLASSES (t) == 0)
+	break;
+
+      t = TYPE_BASECLASS (t, 0);
+    }
+
+  /* C++: If it was not found as a data field, then try to
+     return it as a pointer to a method.  */
+  t = baseclass;
+
+  /* Destructors are a special case.  */
+  if (destructor_name_p (name, t))
+    {
+      error ("pointers to destructors not implemented yet");
+    }
+
+  /* Perform all necessary dereferencing.  */
+  while (intype && TYPE_CODE (intype) == TYPE_CODE_PTR)
+    intype = TYPE_TARGET_TYPE (intype);
+
+  while (t)
+    {
+      for (i = TYPE_NFN_FIELDS (t) - 1; i >= 0; --i)
+	{
+	  if (!strcmp (TYPE_FN_FIELDLIST_NAME (t, i), name))
+	    {
+	      int j = TYPE_FN_FIELDLIST_LENGTH (t, i);
+	      struct fn_field *f = TYPE_FN_FIELDLIST1 (t, i);
+
+	      if (intype == 0 && j > 1)
+		error ("non-unique member `%s' requires type instantiation", name);
+	      if (intype)
+		{
+		  while (j--)
+		    if (TYPE_FN_FIELD_TYPE (f, j) == intype)
+		      break;
+		  if (j < 0)
+		    error ("no member function matches that type instantiation");
+		}
+	      else
+		j = 0;
+
+	      if (TYPE_FN_FIELD_VIRTUAL_P (f, j))
+		{
+		  v = value_from_long (builtin_type_long,
+				       (LONGEST) TYPE_FN_FIELD_VOFFSET (f, j));
+		}
+	      else
+		{
+		  struct symbol *s = lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j),
+						    0, VAR_NAMESPACE, 0, NULL);
+		  v = locate_var_value (s, 0);
+		}
+	      VALUE_TYPE (v) = lookup_pointer_type (lookup_member_type (TYPE_FN_FIELD_TYPE (f, j), baseclass));
+	      return v;
+	    }
+	}
+
+      if (TYPE_N_BASECLASSES (t) == 0)
+	break;
+
+      t = TYPE_BASECLASS (t, 0);
+    }
+  return 0;
+}
+
+/* Compare two argument lists and return the position in which they differ,
+   or zero if equal.
+
+   STATICP is nonzero if the T1 argument list came from a
+   static member function.
+
+   For non-static member functions, we ignore the first argument,
+   which is the type of the instance variable.  This is because we want
+   to handle calls with objects from derived classes.  This is not
+   entirely correct: we should actually check to make sure that a
+   requested operation is type secure, shouldn't we?  FIXME.  */
+
+int
+typecmp (staticp, t1, t2)
+     int staticp;
+     struct type *t1[];
+     value t2[];
+{
+  int i;
+
+  if (staticp && t1 == 0)
+    return t2[1] != 0;
+  if (t1 == 0)
+    return 1;
+  if (t1[0]->code == TYPE_CODE_VOID) return 0;
+  if (t1[!staticp] == 0) return 0;
+  for (i = !staticp; t1[i] && t1[i]->code != TYPE_CODE_VOID; i++)
+    {
+      if (! t2[i]
+	  || t1[i]->code != t2[i]->type->code
+/* Too pessimistic:  || t1[i]->target_type != t2[i]->type->target_type */
+ )
+	return i+1;
+    }
+  if (!t1[i]) return 0;
+  return t2[i] ? i+1 : 0;
+}
+
+/* C++: return the value of the class instance variable, if one exists.
+   Flag COMPLAIN signals an error if the request is made in an
+   inappropriate context.  */
+value
+value_of_this (complain)
+     int complain;
+{
+  extern FRAME selected_frame;
+  struct symbol *func, *sym;
+  struct block *b;
+  int i;
+  static const char funny_this[] = "this";
+  value this;
+ 
+
+  if (selected_frame == 0)
+    if (complain)
+      error ("no frame selected");
+    else return 0;
+
+  func = get_frame_function (selected_frame);
+  if (!func)
+    {
+      if (complain)
+	error ("no `this' in nameless context");
+      else return 0;
+    }
+
+  b = SYMBOL_BLOCK_VALUE (func);
+  i = BLOCK_NSYMS (b);
+  if (i <= 0)
+    if (complain)
+      error ("no args, no `this'");
+    else return 0;
+
+  /* Calling lookup_block_symbol is necessary to get the LOC_REGISTER
+     symbol instead of the LOC_ARG one (if both exist).  */
+  sym = lookup_block_symbol (b, funny_this, VAR_NAMESPACE);
+  if (sym == NULL)
+    {
+      if (complain)
+	error ("current stack frame not in method");
+      else
+	return NULL;
+    }
+
+  this = read_var_value (sym, selected_frame);
+  if (this == 0 && complain)
+    error ("`this' argument at unknown address");
+  return this;
+}