/* Low level packing and unpacking of values for GDB, the GNU Debugger.
- Copyright 1986, 1987, 1989, 1991 Free Software Foundation, Inc.
+ Copyright 1986, 1987, 1989, 1991, 1993, 1994
+ Free Software Foundation, Inc.
This file is part of GDB.
#include "command.h"
#include "gdbcmd.h"
#include "target.h"
+#include "language.h"
#include "demangle.h"
/* Local function prototypes. */
-static value
-value_headof PARAMS ((value, struct type *, struct type *));
+static value_ptr value_headof PARAMS ((value_ptr, struct type *,
+ struct type *));
-static void
-show_values PARAMS ((char *, int));
+static void show_values PARAMS ((char *, int));
-static void
-show_convenience PARAMS ((char *, int));
+static void show_convenience PARAMS ((char *, int));
/* The value-history records all the values printed
by print commands during this session. Each chunk
struct value_history_chunk
{
struct value_history_chunk *next;
- value values[VALUE_HISTORY_CHUNK];
+ value_ptr values[VALUE_HISTORY_CHUNK];
};
/* Chain of chunks now in use. */
(except for those released by calls to release_value)
This is so they can be freed after each command. */
-static value all_values;
+static value_ptr all_values;
/* Allocate a value that has the correct length for type TYPE. */
-value
+value_ptr
allocate_value (type)
struct type *type;
{
- register value val;
+ register value_ptr val;
check_stub_type (type);
- val = (value) xmalloc (sizeof (struct value) + TYPE_LENGTH (type));
+ val = (struct value *) xmalloc (sizeof (struct value) + TYPE_LENGTH (type));
VALUE_NEXT (val) = all_values;
all_values = val;
VALUE_TYPE (val) = type;
VALUE_REGNO (val) = -1;
VALUE_LAZY (val) = 0;
VALUE_OPTIMIZED_OUT (val) = 0;
+ val->modifiable = 1;
return val;
}
/* Allocate a value that has the correct length
for COUNT repetitions type TYPE. */
-value
+value_ptr
allocate_repeat_value (type, count)
struct type *type;
int count;
{
- register value val;
+ register value_ptr val;
- val = (value) xmalloc (sizeof (struct value) + TYPE_LENGTH (type) * count);
+ val =
+ (value_ptr) xmalloc (sizeof (struct value) + TYPE_LENGTH (type) * count);
VALUE_NEXT (val) = all_values;
all_values = val;
VALUE_TYPE (val) = type;
/* Return a mark in the value chain. All values allocated after the
mark is obtained (except for those released) are subject to being freed
if a subsequent value_free_to_mark is passed the mark. */
-value
+value_ptr
value_mark ()
{
return all_values;
(except for those released). */
void
value_free_to_mark (mark)
- value mark;
+ value_ptr mark;
{
- value val, next;
+ value_ptr val, next;
for (val = all_values; val && val != mark; val = next)
{
void
free_all_values ()
{
- register value val, next;
+ register value_ptr val, next;
for (val = all_values; val; val = next)
{
void
release_value (val)
- register value val;
+ register value_ptr val;
{
- register value v;
+ register value_ptr v;
if (all_values == val)
{
}
}
+/* Release all values up to mark */
+value_ptr
+value_release_to_mark (mark)
+ value_ptr mark;
+{
+ value_ptr val, next;
+
+ for (val = next = all_values; next; next = VALUE_NEXT (next))
+ if (VALUE_NEXT (next) == mark)
+ {
+ all_values = VALUE_NEXT (next);
+ VALUE_NEXT (next) = 0;
+ return val;
+ }
+ all_values = 0;
+ return val;
+}
+
/* Return a copy of the value ARG.
It contains the same contents, for same memory address,
but it's a different block of storage. */
-value
+value_ptr
value_copy (arg)
- value arg;
+ value_ptr arg;
{
- register value val;
+ register value_ptr val;
register struct type *type = VALUE_TYPE (arg);
if (VALUE_REPEATED (arg))
val = allocate_repeat_value (type, VALUE_REPETITIONS (arg));
VALUE_BITSIZE (val) = VALUE_BITSIZE (arg);
VALUE_REGNO (val) = VALUE_REGNO (arg);
VALUE_LAZY (val) = VALUE_LAZY (arg);
+ val->modifiable = arg->modifiable;
if (!VALUE_LAZY (val))
{
memcpy (VALUE_CONTENTS_RAW (val), VALUE_CONTENTS_RAW (arg),
int
record_latest_value (val)
- value val;
+ value_ptr val;
{
int i;
if (i) return -1; /* Indicate value not saved in history */
}
+ /* We don't want this value to have anything to do with the inferior anymore.
+ In particular, "set $1 = 50" should not affect the variable from which
+ the value was taken, and fast watchpoints should be able to assume that
+ a value on the value history never changes. */
+ if (VALUE_LAZY (val))
+ value_fetch_lazy (val);
+ /* We preserve VALUE_LVAL so that the user can find out where it was fetched
+ from. This is a bit dubious, because then *&$1 does not just return $1
+ but the current contents of that location. c'est la vie... */
+ val->modifiable = 0;
+ release_value (val);
+
/* Here we treat value_history_count as origin-zero
and applying to the value being stored now. */
}
value_history_chain->values[i] = val;
- release_value (val);
/* Now we regard value_history_count as origin-one
and applying to the value just stored. */
/* Return a copy of the value in the history with sequence number NUM. */
-value
+value_ptr
access_value_history (num)
int num;
{
{
register struct value_history_chunk *next;
register int i;
- register value val;
+ register value_ptr val;
while (value_history_chain)
{
int from_tty;
{
register int i;
- register value val;
+ register value_ptr val;
static int num = 1;
if (num_exp)
{
- if (num_exp[0] == '+' && num_exp[1] == '\0')
- /* "info history +" should print from the stored position. */
- ;
- else
- /* "info history <exp>" should print around value number <exp>. */
+ /* "info history +" should print from the stored position.
+ "info history <exp>" should print around value number <exp>. */
+ if (num_exp[0] != '+' || num_exp[1] != '\0')
num = parse_and_eval_address (num_exp) - 5;
}
else
{
val = access_value_history (i);
printf_filtered ("$%d = ", i);
- value_print (val, stdout, 0, Val_pretty_default);
+ value_print (val, gdb_stdout, 0, Val_pretty_default);
printf_filtered ("\n");
}
return var;
}
-value
+value_ptr
value_of_internalvar (var)
struct internalvar *var;
{
- register value val;
+ register value_ptr val;
#ifdef IS_TRAPPED_INTERNALVAR
if (IS_TRAPPED_INTERNALVAR (var->name))
set_internalvar_component (var, offset, bitpos, bitsize, newval)
struct internalvar *var;
int offset, bitpos, bitsize;
- value newval;
+ value_ptr newval;
{
register char *addr = VALUE_CONTENTS (var->value) + offset;
void
set_internalvar (var, val)
struct internalvar *var;
- value val;
+ value_ptr val;
{
+ value_ptr newval;
+
#ifdef IS_TRAPPED_INTERNALVAR
if (IS_TRAPPED_INTERNALVAR (var->name))
SET_TRAPPED_INTERNALVAR (var, val, 0, 0, 0);
#endif
- free ((PTR)var->value);
- var->value = value_copy (val);
+ newval = value_copy (val);
+
/* Force the value to be fetched from the target now, to avoid problems
later when this internalvar is referenced and the target is gone or
has changed. */
- if (VALUE_LAZY (var->value))
- value_fetch_lazy (var->value);
- release_value (var->value);
+ if (VALUE_LAZY (newval))
+ value_fetch_lazy (newval);
+
+ /* Begin code which must not call error(). If var->value points to
+ something free'd, an error() obviously leaves a dangling pointer.
+ But we also get a danling pointer if var->value points to
+ something in the value chain (i.e., before release_value is
+ called), because after the error free_all_values will get called before
+ long. */
+ free ((PTR)var->value);
+ var->value = newval;
+ release_value (newval);
+ /* End code which must not call error(). */
}
char *
varseen = 1;
}
printf_filtered ("$%s = ", var->name);
- value_print (var->value, stdout, 0, Val_pretty_default);
+ value_print (var->value, gdb_stdout, 0, Val_pretty_default);
printf_filtered ("\n");
}
if (!varseen)
- printf ("No debugger convenience variables now defined.\n\
+ printf_unfiltered ("No debugger convenience variables now defined.\n\
Convenience variables have names starting with \"$\";\n\
use \"set\" as in \"set $foo = 5\" to define them.\n");
}
LONGEST
value_as_long (val)
- register value val;
+ register value_ptr val;
{
/* This coerces arrays and functions, which is necessary (e.g.
in disassemble_command). It also dereferences references, which
double
value_as_double (val)
- register value val;
+ register value_ptr val;
{
double foo;
int inv;
Does not deallocate the value. */
CORE_ADDR
value_as_pointer (val)
- value val;
+ value_ptr val;
{
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
whether we want this to be true eventually. */
+#if 0
+ /* ADDR_BITS_REMOVE is wrong if we are being called for a
+ non-address (e.g. argument to "signal", "info break", etc.), or
+ for pointers to char, in which the low bits *are* significant. */
return ADDR_BITS_REMOVE(value_as_long (val));
+#else
+ return value_as_long (val);
+#endif
}
\f
/* Unpack raw data (copied from debugee, target byte order) at VALADDR
to member which reaches here is considered to be equivalent
to an INT (or some size). After all, it is only an offset. */
-/* FIXME: This should be rewritten as a switch statement for speed and
- ease of comprehension. */
-
LONGEST
unpack_long (type, valaddr)
struct type *type;
register int len = TYPE_LENGTH (type);
register int nosign = TYPE_UNSIGNED (type);
- if (code == TYPE_CODE_ENUM || code == TYPE_CODE_BOOL)
- code = TYPE_CODE_INT;
- if (code == TYPE_CODE_FLT)
+ switch (code)
{
- if (len == sizeof (float))
- {
- float retval;
- memcpy (&retval, valaddr, sizeof (retval));
- SWAP_TARGET_AND_HOST (&retval, sizeof (retval));
- return retval;
- }
-
- if (len == sizeof (double))
- {
- double retval;
- memcpy (&retval, valaddr, sizeof (retval));
- SWAP_TARGET_AND_HOST (&retval, sizeof (retval));
- return retval;
- }
+ case TYPE_CODE_ENUM:
+ case TYPE_CODE_BOOL:
+ case TYPE_CODE_INT:
+ case TYPE_CODE_CHAR:
+ case TYPE_CODE_RANGE:
+ if (nosign)
+ return extract_unsigned_integer (valaddr, len);
else
- {
- error ("Unexpected type of floating point number.");
- }
- }
- else if ((code == TYPE_CODE_INT || code == TYPE_CODE_CHAR) && nosign)
- {
- return extract_unsigned_integer (valaddr, len);
- }
- else if (code == TYPE_CODE_INT || code == TYPE_CODE_CHAR)
- {
- return extract_signed_integer (valaddr, len);
- }
- /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
- whether we want this to be true eventually. */
- else if (code == TYPE_CODE_PTR || code == TYPE_CODE_REF)
- {
+ return extract_signed_integer (valaddr, len);
+
+ case TYPE_CODE_FLT:
+ return extract_floating (valaddr, len);
+
+ case TYPE_CODE_PTR:
+ case TYPE_CODE_REF:
+ /* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
+ whether we want this to be true eventually. */
return extract_address (valaddr, len);
- }
- else if (code == TYPE_CODE_MEMBER)
- error ("not implemented: member types in unpack_long");
- error ("Value not integer or pointer.");
- return 0; /* For lint -- never reached */
+ case TYPE_CODE_MEMBER:
+ error ("not implemented: member types in unpack_long");
+
+ default:
+ error ("Value can't be converted to integer.");
+ }
+ return 0; /* Placate lint. */
}
/* Return a double value from the specified type and address.
*invp = 0; /* Assume valid. */
if (code == TYPE_CODE_FLT)
{
+#ifdef INVALID_FLOAT
if (INVALID_FLOAT (valaddr, len))
{
*invp = 1;
return 1.234567891011121314;
}
-
- if (len == sizeof (float))
- {
- float retval;
- memcpy (&retval, valaddr, sizeof (retval));
- SWAP_TARGET_AND_HOST (&retval, sizeof (retval));
- return retval;
- }
-
- if (len == sizeof (double))
- {
- double retval;
- memcpy (&retval, valaddr, sizeof (retval));
- SWAP_TARGET_AND_HOST (&retval, sizeof (retval));
- return retval;
- }
- else
- {
- error ("Unexpected type of floating point number.");
- return 0; /* Placate lint. */
- }
+#endif
+ return extract_floating (valaddr, len);
+ }
+ else if (nosign)
+ {
+ /* Unsigned -- be sure we compensate for signed LONGEST. */
+ return (unsigned LONGEST) unpack_long (type, valaddr);
+ }
+ else
+ {
+ /* Signed -- we are OK with unpack_long. */
+ return unpack_long (type, valaddr);
}
- else if (nosign) {
- /* Unsigned -- be sure we compensate for signed LONGEST. */
- return (unsigned LONGEST) unpack_long (type, valaddr);
- } else {
- /* Signed -- we are OK with unpack_long. */
- return unpack_long (type, valaddr);
- }
}
/* Unpack raw data (copied from debugee, target byte order) at VALADDR
For C++, must also be able to return values from static fields */
-value
+value_ptr
value_primitive_field (arg1, offset, fieldno, arg_type)
- register value arg1;
+ register value_ptr arg1;
int offset;
register int fieldno;
register struct type *arg_type;
{
- register value v;
+ register value_ptr v;
register struct type *type;
check_stub_type (arg_type);
For C++, must also be able to return values from static fields */
-value
+value_ptr
value_field (arg1, fieldno)
- register value arg1;
+ register value_ptr arg1;
register int fieldno;
{
return value_primitive_field (arg1, 0, fieldno, VALUE_TYPE (arg1));
F is the list of member functions which contains the desired method.
J is an index into F which provides the desired method. */
-value
+value_ptr
value_fn_field (arg1p, f, j, type, offset)
- value *arg1p;
+ value_ptr *arg1p;
struct fn_field *f;
int j;
struct type *type;
int offset;
{
- register value v;
+ register value_ptr v;
register struct type *ftype = TYPE_FN_FIELD_TYPE (f, j);
struct symbol *sym;
sym = lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j),
0, VAR_NAMESPACE, 0, NULL);
- if (! sym) error ("Internal error: could not find physical method named %s",
+ if (! sym)
+ return NULL;
+/*
+ error ("Internal error: could not find physical method named %s",
TYPE_FN_FIELD_PHYSNAME (f, j));
+*/
v = allocate_value (ftype);
VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
*arg1p = value_ind (value_cast (lookup_pointer_type (type),
value_addr (*arg1p)));
- /* Move the `this' pointer according to the offset. */
+ /* Move the `this' pointer according to the offset.
VALUE_OFFSET (*arg1p) += offset;
+ */
}
return v;
J is an index into F which provides the desired virtual function.
TYPE is the type in which F is located. */
-value
+value_ptr
value_virtual_fn_field (arg1p, f, j, type, offset)
- value *arg1p;
+ value_ptr *arg1p;
struct fn_field *f;
int j;
struct type *type;
int offset;
{
- value arg1 = *arg1p;
+ value_ptr arg1 = *arg1p;
/* First, get the virtual function table pointer. That comes
with a strange type, so cast it to type `pointer to long' (which
should serve just fine as a function type). Then, index into
the table, and convert final value to appropriate function type. */
- value entry, vfn, vtbl;
- value vi = value_from_longest (builtin_type_int,
- (LONGEST) TYPE_FN_FIELD_VOFFSET (f, j));
+ value_ptr entry, vfn, vtbl;
+ value_ptr vi = value_from_longest (builtin_type_int,
+ (LONGEST) TYPE_FN_FIELD_VOFFSET (f, j));
struct type *fcontext = TYPE_FN_FIELD_FCONTEXT (f, j);
struct type *context;
if (fcontext == NULL)
a virtual function. */
entry = value_subscript (vtbl, vi);
- /* Move the `this' pointer according to the virtual function table. */
- VALUE_OFFSET (arg1) += value_as_long (value_field (entry, 0)) + offset;
- if (! VALUE_LAZY (arg1))
+ if (TYPE_CODE (VALUE_TYPE (entry)) == TYPE_CODE_STRUCT)
{
- VALUE_LAZY (arg1) = 1;
- value_fetch_lazy (arg1);
- }
+ /* Move the `this' pointer according to the virtual function table. */
+ VALUE_OFFSET (arg1) += value_as_long (value_field (entry, 0));
+
+ if (! VALUE_LAZY (arg1))
+ {
+ VALUE_LAZY (arg1) = 1;
+ value_fetch_lazy (arg1);
+ }
- vfn = value_field (entry, 2);
+ vfn = value_field (entry, 2);
+ }
+ else if (TYPE_CODE (VALUE_TYPE (entry)) == TYPE_CODE_PTR)
+ vfn = entry;
+ else
+ error ("I'm confused: virtual function table has bad type");
/* Reinstantiate the function pointer with the correct type. */
VALUE_TYPE (vfn) = lookup_pointer_type (TYPE_FN_FIELD_TYPE (f, j));
FIXME-tiemann: should work with dossier entries as well. */
-static value
+static value_ptr
value_headof (in_arg, btype, dtype)
- value in_arg;
+ value_ptr in_arg;
struct type *btype, *dtype;
{
/* First collect the vtables we must look at for this object. */
/* FIXME-tiemann: right now, just look at top-most vtable. */
- value arg, vtbl, entry, best_entry = 0;
+ value_ptr arg, vtbl, entry, best_entry = 0;
int i, nelems;
int offset, best_offset = 0;
struct symbol *sym;
/* Check that VTBL looks like it points to a virtual function table. */
msymbol = lookup_minimal_symbol_by_pc (VALUE_ADDRESS (vtbl));
if (msymbol == NULL
- || !VTBL_PREFIX_P (demangled_name = SYMBOL_NAME (msymbol)))
+ || (demangled_name = SYMBOL_NAME (msymbol)) == NULL
+ || !VTBL_PREFIX_P (demangled_name))
{
/* If we expected to find a vtable, but did not, let the user
know that we aren't happy, but don't throw an error.
{
entry = value_subscript (vtbl, value_from_longest (builtin_type_int,
(LONGEST) i));
+ /* This won't work if we're using thunks. */
+ if (TYPE_CODE (VALUE_TYPE (entry)) != TYPE_CODE_STRUCT)
+ break;
offset = longest_to_int (value_as_long (value_field (entry, 0)));
/* If we use '<=' we can handle single inheritance
* where all offsets are zero - just use the first entry found. */
of its baseclasses) to figure out the most derived type that ARG
could actually be a pointer to. */
-value
+value_ptr
value_from_vtable_info (arg, type)
- value arg;
+ value_ptr arg;
struct type *type;
{
/* Take care of preliminaries. */
struct type *basetype;
{
struct type *fieldtype;
- struct type *fieldtype_target_type;
char *name = TYPE_FIELD_NAME (type, index);
char *field_class_name = NULL;
baseclass_offset (type, index, arg, offset)
struct type *type;
int index;
- value arg;
+ value_ptr arg;
int offset;
{
struct type *basetype = TYPE_BASECLASS (type, index);
struct type *type;
int index;
char *valaddr;
- value *valuep;
+ value_ptr *valuep;
int *errp;
{
struct type *basetype = TYPE_BASECLASS (type, index);
{
if (vb_match (type, i, basetype))
{
- value val = allocate_value (basetype);
+ value_ptr val = allocate_value (basetype);
CORE_ADDR addr;
int status;
/* Extract bits. See comment above. */
-#if BITS_BIG_ENDIAN
- lsbcount = (sizeof val * 8 - bitpos % 8 - bitsize);
-#else
- lsbcount = (bitpos % 8);
-#endif
+ if (BITS_BIG_ENDIAN)
+ lsbcount = (sizeof val * 8 - bitpos % 8 - bitsize);
+ else
+ lsbcount = (bitpos % 8);
val >>= lsbcount;
/* If the field does not entirely fill a LONGEST, then zero the sign bits.
oword = extract_signed_integer (addr, sizeof oword);
/* Shifting for bit field depends on endianness of the target machine. */
-#if BITS_BIG_ENDIAN
- bitpos = sizeof (oword) * 8 - bitpos - bitsize;
-#endif
+ if (BITS_BIG_ENDIAN)
+ bitpos = sizeof (oword) * 8 - bitpos - bitsize;
/* Mask out old value, while avoiding shifts >= size of oword */
if (bitsize < 8 * sizeof (oword))
\f
/* Convert C numbers into newly allocated values */
-value
+value_ptr
value_from_longest (type, num)
struct type *type;
register LONGEST num;
{
- register value val = allocate_value (type);
+ register value_ptr val = allocate_value (type);
register enum type_code code = TYPE_CODE (type);
register int len = TYPE_LENGTH (type);
case TYPE_CODE_CHAR:
case TYPE_CODE_ENUM:
case TYPE_CODE_BOOL:
+ case TYPE_CODE_RANGE:
store_signed_integer (VALUE_CONTENTS_RAW (val), len, num);
break;
return val;
}
-value
+value_ptr
value_from_double (type, num)
struct type *type;
double num;
{
- register value val = allocate_value (type);
+ register value_ptr val = allocate_value (type);
register enum type_code code = TYPE_CODE (type);
register int len = TYPE_LENGTH (type);
if (code == TYPE_CODE_FLT)
{
- if (len == sizeof (float))
- * (float *) VALUE_CONTENTS_RAW (val) = num;
- else if (len == sizeof (double))
- * (double *) VALUE_CONTENTS_RAW (val) = num;
- else
- error ("Floating type encountered with unexpected data length.");
+ store_floating (VALUE_CONTENTS_RAW (val), len, num);
}
else
error ("Unexpected type encountered for floating constant.");
- /* num was in host byte order. So now put the value's contents
- into target byte order. */
- SWAP_TARGET_AND_HOST (VALUE_CONTENTS_RAW (val), len);
-
return val;
}
\f
0 when it is using the value returning conventions (this often
means returning pointer to where structure is vs. returning value). */
-value
+value_ptr
value_being_returned (valtype, retbuf, struct_return)
register struct type *valtype;
char retbuf[REGISTER_BYTES];
int struct_return;
/*ARGSUSED*/
{
- register value val;
+ register value_ptr val;
CORE_ADDR addr;
#if defined (EXTRACT_STRUCT_VALUE_ADDRESS)
int
using_struct_return (function, funcaddr, value_type, gcc_p)
- value function;
+ value_ptr function;
CORE_ADDR funcaddr;
struct type *value_type;
int gcc_p;
void
set_return_value (val)
- value val;
+ value_ptr val;
{
register enum type_code code = TYPE_CODE (VALUE_TYPE (val));
- double dbuf;
- LONGEST lbuf;
if (code == TYPE_CODE_ERROR)
error ("Function return type unknown.");
|| code == TYPE_CODE_UNION) /* FIXME, implement struct return. */
error ("GDB does not support specifying a struct or union return value.");
- /* FIXME, this is bogus. We don't know what the return conventions
- are, or how values should be promoted.... */
- if (code == TYPE_CODE_FLT)
- {
- dbuf = value_as_double (val);
-
- STORE_RETURN_VALUE (VALUE_TYPE (val), (char *)&dbuf);
- }
- else
- {
- lbuf = value_as_long (val);
- STORE_RETURN_VALUE (VALUE_TYPE (val), (char *)&lbuf);
- }
+ STORE_RETURN_VALUE (VALUE_TYPE (val), VALUE_CONTENTS (val));
}
\f
void
projects / deliverable / binutils-gdb.git / blobdiff