/* Low level packing and unpacking of values for GDB, the GNU Debugger.
+
Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
- 1995, 1996, 1997, 1998, 1999, 2000, 2002.
- Free Software Foundation, Inc.
+ 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003 Free Software
+ Foundation, Inc.
This file is part of GDB.
#include "demangle.h"
#include "doublest.h"
#include "gdb_assert.h"
+#include "regcache.h"
/* Prototypes for exported functions. */
/* Prototypes for local functions. */
-static struct value *value_headof (struct value *, struct type *, struct type *);
-
static void show_values (char *, int);
static void show_convenience (char *, int);
to an INT (or some size). After all, it is only an offset. */
LONGEST
-unpack_long (struct type *type, char *valaddr)
+unpack_long (struct type *type, const char *valaddr)
{
register enum type_code code = TYPE_CODE (type);
register int len = TYPE_LENGTH (type);
format, result is in host format. */
DOUBLEST
-unpack_double (struct type *type, char *valaddr, int *invp)
+unpack_double (struct type *type, const char *valaddr, int *invp)
{
enum type_code code;
int len;
nosign = TYPE_UNSIGNED (type);
if (code == TYPE_CODE_FLT)
{
-#ifdef INVALID_FLOAT
- if (INVALID_FLOAT (valaddr, len))
- {
- *invp = 1;
- return 1.234567891011121314;
- }
-#endif
+ /* NOTE: cagney/2002-02-19: There was a test here to see if the
+ floating-point value was valid (using the macro
+ INVALID_FLOAT). That test/macro have been removed.
+
+ It turns out that only the VAX defined this macro and then
+ only in a non-portable way. Fixing the portability problem
+ wouldn't help since the VAX floating-point code is also badly
+ bit-rotten. The target needs to add definitions for the
+ methods TARGET_FLOAT_FORMAT and TARGET_DOUBLE_FORMAT - these
+ exactly describe the target floating-point format. The
+ problem here is that the corresponding floatformat_vax_f and
+ floatformat_vax_d values these methods should be set to are
+ also not defined either. Oops!
+
+ Hopefully someone will add both the missing floatformat
+ definitions and floatformat_is_invalid() function. */
return extract_typed_floating (valaddr, type);
}
else if (nosign)
to an INT (or some size). After all, it is only an offset. */
CORE_ADDR
-unpack_pointer (struct type *type, char *valaddr)
+unpack_pointer (struct type *type, const char *valaddr)
{
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
whether we want this to be true eventually. */
}
\f
-/* Get the value of the FIELDN'th field (which must be static) of TYPE. */
+/* Get the value of the FIELDN'th field (which must be static) of
+ TYPE. Return NULL if the field doesn't exist or has been
+ optimized out. */
struct value *
value_static_field (struct type *type, int fieldno)
{
- CORE_ADDR addr;
- asection *sect;
+ struct value *retval;
+
if (TYPE_FIELD_STATIC_HAS_ADDR (type, fieldno))
{
- addr = TYPE_FIELD_STATIC_PHYSADDR (type, fieldno);
- sect = NULL;
+ retval = value_at (TYPE_FIELD_TYPE (type, fieldno),
+ TYPE_FIELD_STATIC_PHYSADDR (type, fieldno),
+ NULL);
}
else
{
return NULL;
else
{
- addr = SYMBOL_VALUE_ADDRESS (msym);
- sect = SYMBOL_BFD_SECTION (msym);
+ retval = value_at (TYPE_FIELD_TYPE (type, fieldno),
+ SYMBOL_VALUE_ADDRESS (msym),
+ SYMBOL_BFD_SECTION (msym));
}
}
else
{
- /* Anything static that isn't a constant, has an address */
- if (SYMBOL_CLASS (sym) != LOC_CONST)
- {
- addr = SYMBOL_VALUE_ADDRESS (sym);
- sect = SYMBOL_BFD_SECTION (sym);
- }
- /* However, static const's do not, the value is already known. */
- else
- {
- return value_from_longest (TYPE_FIELD_TYPE (type, fieldno), SYMBOL_VALUE (sym));
- }
+ /* SYM should never have a SYMBOL_CLASS which will require
+ read_var_value to use the FRAME parameter. */
+ if (symbol_read_needs_frame (sym))
+ warning ("static field's value depends on the current "
+ "frame - bad debug info?");
+ retval = read_var_value (sym, NULL);
}
- SET_FIELD_PHYSADDR (TYPE_FIELD (type, fieldno), addr);
+ if (retval && VALUE_LVAL (retval) == lval_memory)
+ SET_FIELD_PHYSADDR (TYPE_FIELD (type, fieldno),
+ VALUE_ADDRESS (retval));
}
- return value_at (TYPE_FIELD_TYPE (type, fieldno), addr, sect);
+ return retval;
}
/* Change the enclosing type of a value object VAL to NEW_ENCL_TYPE.
struct value *prev;
new_val = (struct value *) xrealloc (val, sizeof (struct value) + TYPE_LENGTH (new_encl_type));
-
+
+ VALUE_ENCLOSING_TYPE (new_val) = new_encl_type;
+
/* We have to make sure this ends up in the same place in the value
chain as the original copy, so it's clean-up behavior is the same.
If the value has been released, this is a waste of time, but there
return v;
}
-/* ARG is a pointer to an object we know to be at least
- a DTYPE. BTYPE is the most derived basetype that has
- already been searched (and need not be searched again).
- After looking at the vtables between BTYPE and DTYPE,
- return the most derived type we find. The caller must
- be satisfied when the return value == DTYPE.
-
- FIXME-tiemann: should work with dossier entries as well.
- NOTICE - djb: I see no good reason at all to keep this function now that
- we have RTTI support. It's used in literally one place, and it's
- hard to keep this function up to date when it's purpose is served
- by value_rtti_type efficiently.
- Consider it gone for 5.1. */
-
-static struct value *
-value_headof (struct value *in_arg, struct type *btype, struct type *dtype)
-{
- /* First collect the vtables we must look at for this object. */
- struct value *arg;
- struct value *vtbl;
- struct symbol *sym;
- char *demangled_name;
- struct minimal_symbol *msymbol;
-
- btype = TYPE_VPTR_BASETYPE (dtype);
- CHECK_TYPEDEF (btype);
- arg = in_arg;
- if (btype != dtype)
- arg = value_cast (lookup_pointer_type (btype), arg);
- if (TYPE_CODE (VALUE_TYPE (arg)) == TYPE_CODE_REF)
- {
- /*
- * Copy the value, but change the type from (T&) to (T*).
- * We keep the same location information, which is efficient,
- * and allows &(&X) to get the location containing the reference.
- */
- arg = value_copy (arg);
- VALUE_TYPE (arg) = lookup_pointer_type (TYPE_TARGET_TYPE (VALUE_TYPE (arg)));
- }
- if (VALUE_ADDRESS(value_field (value_ind(arg), TYPE_VPTR_FIELDNO (btype)))==0)
- return arg;
-
- vtbl = value_ind (value_field (value_ind (arg), TYPE_VPTR_FIELDNO (btype)));
- /* Turn vtable into typeinfo function */
- VALUE_OFFSET(vtbl)+=4;
-
- msymbol = lookup_minimal_symbol_by_pc ( value_as_address(value_ind(vtbl)) );
- if (msymbol == NULL
- || (demangled_name = SYMBOL_NAME (msymbol)) == NULL)
- {
- /* 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.
- FIXME: there has to be a better way to do this. */
- struct type *error_type = (struct type *) xmalloc (sizeof (struct type));
- memcpy (error_type, VALUE_TYPE (in_arg), sizeof (struct type));
- TYPE_NAME (error_type) = savestring ("suspicious *", sizeof ("suspicious *"));
- VALUE_TYPE (in_arg) = error_type;
- return in_arg;
- }
- demangled_name = cplus_demangle(demangled_name,DMGL_ANSI);
- *(strchr (demangled_name, ' ')) = '\0';
-
- sym = lookup_symbol (demangled_name, 0, VAR_NAMESPACE, 0, 0);
- if (sym == NULL)
- error ("could not find type declaration for `%s'", demangled_name);
-
- arg = in_arg;
- VALUE_TYPE (arg) = lookup_pointer_type (SYMBOL_TYPE (sym));
- return arg;
-}
-
-/* ARG is a pointer object of type TYPE. If TYPE has virtual
- function tables, probe ARG's tables (including the vtables
- of its baseclasses) to figure out the most derived type that ARG
- could actually be a pointer to. */
-
-struct value *
-value_from_vtable_info (struct value *arg, struct type *type)
-{
- /* Take care of preliminaries. */
- if (TYPE_VPTR_FIELDNO (type) < 0)
- fill_in_vptr_fieldno (type);
- if (TYPE_VPTR_FIELDNO (type) < 0)
- return 0;
-
- return value_headof (arg, 0, type);
-}
\f
/* Unpack a field FIELDNO of the specified TYPE, from the anonymous object at
VALADDR.
If the field is signed, we also do sign extension. */
LONGEST
-unpack_field_as_long (struct type *type, char *valaddr, int fieldno)
+unpack_field_as_long (struct type *type, const char *valaddr, int fieldno)
{
ULONGEST val;
ULONGEST valmask;
/* ARGSUSED */
struct value *
-value_being_returned (struct type *valtype, char *retbuf, int struct_return)
+value_being_returned (struct type *valtype, struct regcache *retbuf,
+ int struct_return)
{
struct value *val;
CORE_ADDR addr;
return value_at (valtype, addr, NULL);
}
+ /* If this is not defined, just use EXTRACT_RETURN_VALUE instead. */
+ if (DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS_P ())
+ if (struct_return)
+ {
+ char *buf = deprecated_grub_regcache_for_registers (retbuf);
+ addr = DEPRECATED_EXTRACT_STRUCT_VALUE_ADDRESS (buf);
+ if (!addr)
+ error ("Function return value unknown.");
+ return value_at (valtype, addr, NULL);
+ }
+
val = allocate_value (valtype);
CHECK_TYPEDEF (valtype);
EXTRACT_RETURN_VALUE (valtype, retbuf, VALUE_CONTENTS_RAW (val));
|| code == TYPE_CODE_UNION) /* FIXME, implement struct return. */
error ("GDB does not support specifying a struct or union return value.");
- STORE_RETURN_VALUE (type, VALUE_CONTENTS (val));
+ STORE_RETURN_VALUE (type, current_regcache, VALUE_CONTENTS (val));
}
\f
void
projects / deliverable / binutils-gdb.git / blobdiff