/* 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
- Free Software Foundation, Inc.
+
+ Copyright 1986, 1987, 1988, 1989, 1990, 1991, 1992, 1993, 1994,
+ 1995, 1996, 1997, 1998, 1999, 2000, 2002, 2003 Free Software
+ Foundation, Inc.
This file is part of GDB.
#include "scm-lang.h"
#include "demangle.h"
#include "doublest.h"
+#include "gdb_assert.h"
+#include "regcache.h"
+#include "block.h"
/* Prototypes for exported functions. */
/* Prototypes for local functions. */
-static value_ptr value_headof (value_ptr, struct type *, struct type *);
-
static void show_values (char *, int);
static void show_convenience (char *, int);
struct value_history_chunk
{
struct value_history_chunk *next;
- value_ptr values[VALUE_HISTORY_CHUNK];
+ struct value *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_ptr all_values;
+static struct value *all_values;
/* Allocate a value that has the correct length for type TYPE. */
-value_ptr
+struct value *
allocate_value (struct type *type)
{
- register value_ptr val;
+ struct value *val;
struct type *atype = check_typedef (type);
val = (struct value *) xmalloc (sizeof (struct value) + TYPE_LENGTH (atype));
VALUE_ENCLOSING_TYPE (val) = type;
VALUE_LVAL (val) = not_lval;
VALUE_ADDRESS (val) = 0;
- VALUE_FRAME (val) = 0;
+ VALUE_FRAME_ID (val) = null_frame_id;
VALUE_OFFSET (val) = 0;
VALUE_BITPOS (val) = 0;
VALUE_BITSIZE (val) = 0;
/* Allocate a value that has the correct length
for COUNT repetitions type TYPE. */
-value_ptr
+struct value *
allocate_repeat_value (struct type *type, int count)
{
int low_bound = current_language->string_lower_bound; /* ??? */
/* 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_ptr
+struct value *
value_mark (void)
{
return all_values;
/* Free all values allocated since MARK was obtained by value_mark
(except for those released). */
void
-value_free_to_mark (value_ptr mark)
+value_free_to_mark (struct value *mark)
{
- value_ptr val, next;
+ struct value *val;
+ struct value *next;
for (val = all_values; val && val != mark; val = next)
{
void
free_all_values (void)
{
- register value_ptr val, next;
+ struct value *val;
+ struct value *next;
for (val = all_values; val; val = next)
{
so it will not be freed automatically. */
void
-release_value (register value_ptr val)
+release_value (struct value *val)
{
- register value_ptr v;
+ struct value *v;
if (all_values == val)
{
}
/* Release all values up to mark */
-value_ptr
-value_release_to_mark (value_ptr mark)
+struct value *
+value_release_to_mark (struct value *mark)
{
- value_ptr val, next;
+ struct value *val;
+ struct value *next;
for (val = next = all_values; next; next = VALUE_NEXT (next))
if (VALUE_NEXT (next) == mark)
It contains the same contents, for same memory address,
but it's a different block of storage. */
-value_ptr
-value_copy (value_ptr arg)
+struct value *
+value_copy (struct value *arg)
{
- register struct type *encl_type = VALUE_ENCLOSING_TYPE (arg);
- register value_ptr val = allocate_value (encl_type);
+ struct type *encl_type = VALUE_ENCLOSING_TYPE (arg);
+ struct value *val = allocate_value (encl_type);
VALUE_TYPE (val) = VALUE_TYPE (arg);
VALUE_LVAL (val) = VALUE_LVAL (arg);
VALUE_ADDRESS (val) = VALUE_ADDRESS (arg);
VALUE_OFFSET (val) = VALUE_OFFSET (arg);
VALUE_BITPOS (val) = VALUE_BITPOS (arg);
VALUE_BITSIZE (val) = VALUE_BITSIZE (arg);
- VALUE_FRAME (val) = VALUE_FRAME (arg);
+ VALUE_FRAME_ID (val) = VALUE_FRAME_ID (arg);
VALUE_REGNO (val) = VALUE_REGNO (arg);
VALUE_LAZY (val) = VALUE_LAZY (arg);
VALUE_OPTIMIZED_OUT (val) = VALUE_OPTIMIZED_OUT (arg);
value history index of this new item. */
int
-record_latest_value (value_ptr val)
+record_latest_value (struct value *val)
{
int i;
i = value_history_count % VALUE_HISTORY_CHUNK;
if (i == 0)
{
- register struct value_history_chunk *new
+ struct value_history_chunk *new
= (struct value_history_chunk *)
xmalloc (sizeof (struct value_history_chunk));
memset (new->values, 0, sizeof new->values);
/* Return a copy of the value in the history with sequence number NUM. */
-value_ptr
+struct value *
access_value_history (int num)
{
- register struct value_history_chunk *chunk;
- register int i;
- register int absnum = num;
+ struct value_history_chunk *chunk;
+ int i;
+ int absnum = num;
if (absnum <= 0)
absnum += value_history_count;
void
clear_value_history (void)
{
- register struct value_history_chunk *next;
- register int i;
- register value_ptr val;
+ struct value_history_chunk *next;
+ int i;
+ struct value *val;
while (value_history_chain)
{
static void
show_values (char *num_exp, int from_tty)
{
- register int i;
- register value_ptr val;
+ int i;
+ struct value *val;
static int num = 1;
if (num_exp)
struct internalvar *
lookup_internalvar (char *name)
{
- register struct internalvar *var;
+ struct internalvar *var;
for (var = internalvars; var; var = var->next)
- if (STREQ (var->name, name))
+ if (strcmp (var->name, name) == 0)
return var;
var = (struct internalvar *) xmalloc (sizeof (struct internalvar));
return var;
}
-value_ptr
+struct value *
value_of_internalvar (struct internalvar *var)
{
- register value_ptr val;
-
-#ifdef IS_TRAPPED_INTERNALVAR
- if (IS_TRAPPED_INTERNALVAR (var->name))
- return VALUE_OF_TRAPPED_INTERNALVAR (var);
-#endif
+ struct value *val;
val = value_copy (var->value);
if (VALUE_LAZY (val))
void
set_internalvar_component (struct internalvar *var, int offset, int bitpos,
- int bitsize, value_ptr newval)
+ int bitsize, struct value *newval)
{
- register char *addr = VALUE_CONTENTS (var->value) + offset;
-
-#ifdef IS_TRAPPED_INTERNALVAR
- if (IS_TRAPPED_INTERNALVAR (var->name))
- SET_TRAPPED_INTERNALVAR (var, newval, bitpos, bitsize, offset);
-#endif
+ char *addr = VALUE_CONTENTS (var->value) + offset;
if (bitsize)
modify_field (addr, value_as_long (newval),
}
void
-set_internalvar (struct internalvar *var, value_ptr val)
+set_internalvar (struct internalvar *var, struct value *val)
{
- value_ptr newval;
-
-#ifdef IS_TRAPPED_INTERNALVAR
- if (IS_TRAPPED_INTERNALVAR (var->name))
- SET_TRAPPED_INTERNALVAR (var, val, 0, 0, 0);
-#endif
+ struct value *newval;
newval = value_copy (val);
newval->modifiable = 1;
void
clear_internalvars (void)
{
- register struct internalvar *var;
+ struct internalvar *var;
while (internalvars)
{
static void
show_convenience (char *ignore, int from_tty)
{
- register struct internalvar *var;
+ struct internalvar *var;
int varseen = 0;
for (var = internalvars; var; var = var->next)
{
-#ifdef IS_TRAPPED_INTERNALVAR
- if (IS_TRAPPED_INTERNALVAR (var->name))
- continue;
-#endif
if (!varseen)
{
varseen = 1;
Does not deallocate the value. */
LONGEST
-value_as_long (register value_ptr val)
+value_as_long (struct value *val)
{
/* This coerces arrays and functions, which is necessary (e.g.
in disassemble_command). It also dereferences references, which
}
DOUBLEST
-value_as_double (register value_ptr val)
+value_as_double (struct value *val)
{
DOUBLEST foo;
int inv;
Note that val's type may not actually be a pointer; value_as_long
handles all the cases. */
CORE_ADDR
-value_as_address (value_ptr val)
+value_as_address (struct value *val)
{
/* Assume a CORE_ADDR can fit in a LONGEST (for now). Not sure
whether we want this to be true eventually. */
for pointers to char, in which the low bits *are* significant. */
return ADDR_BITS_REMOVE (value_as_long (val));
#else
+
+ /* There are several targets (IA-64, PowerPC, and others) which
+ don't represent pointers to functions as simply the address of
+ the function's entry point. For example, on the IA-64, a
+ function pointer points to a two-word descriptor, generated by
+ the linker, which contains the function's entry point, and the
+ value the IA-64 "global pointer" register should have --- to
+ support position-independent code. The linker generates
+ descriptors only for those functions whose addresses are taken.
+
+ On such targets, it's difficult for GDB to convert an arbitrary
+ function address into a function pointer; it has to either find
+ an existing descriptor for that function, or call malloc and
+ build its own. On some targets, it is impossible for GDB to
+ build a descriptor at all: the descriptor must contain a jump
+ instruction; data memory cannot be executed; and code memory
+ cannot be modified.
+
+ Upon entry to this function, if VAL is a value of type `function'
+ (that is, TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FUNC), then
+ VALUE_ADDRESS (val) is the address of the function. This is what
+ you'll get if you evaluate an expression like `main'. The call
+ to COERCE_ARRAY below actually does all the usual unary
+ conversions, which includes converting values of type `function'
+ to `pointer to function'. This is the challenging conversion
+ discussed above. Then, `unpack_long' will convert that pointer
+ back into an address.
+
+ So, suppose the user types `disassemble foo' on an architecture
+ with a strange function pointer representation, on which GDB
+ cannot build its own descriptors, and suppose further that `foo'
+ has no linker-built descriptor. The address->pointer conversion
+ will signal an error and prevent the command from running, even
+ though the next step would have been to convert the pointer
+ directly back into the same address.
+
+ The following shortcut avoids this whole mess. If VAL is a
+ function, just return its address directly. */
+ if (TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_FUNC
+ || TYPE_CODE (VALUE_TYPE (val)) == TYPE_CODE_METHOD)
+ return VALUE_ADDRESS (val);
+
COERCE_ARRAY (val);
/* Some architectures (e.g. Harvard), map instruction and data
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);
- register int nosign = TYPE_UNSIGNED (type);
+ enum type_code code = TYPE_CODE (type);
+ int len = TYPE_LENGTH (type);
+ int nosign = TYPE_UNSIGNED (type);
if (current_language->la_language == language_scm
&& is_scmvalue_type (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))
+ /* 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 the new cases for floatformat_is_valid (). */
+
+ if (!floatformat_is_valid (floatformat_from_type (type), valaddr))
{
*invp = 1;
- return 1.234567891011121314;
+ return 0.0;
}
-#endif
+
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. */
-value_ptr
+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
{
char *phys_name = TYPE_FIELD_STATIC_PHYSNAME (type, fieldno);
- struct symbol *sym = lookup_symbol (phys_name, 0, VAR_NAMESPACE, 0, NULL);
+ struct symbol *sym = lookup_symbol (phys_name, 0, VAR_DOMAIN, 0, NULL);
if (sym == NULL)
{
/* With some compilers, e.g. HP aCC, static data members are reported
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.
than the old enclosing type, you have to allocate more space for the data.
The return value is a pointer to the new version of this value structure. */
-value_ptr
-value_change_enclosing_type (value_ptr val, struct type *new_encl_type)
+struct value *
+value_change_enclosing_type (struct value *val, struct type *new_encl_type)
{
if (TYPE_LENGTH (new_encl_type) <= TYPE_LENGTH (VALUE_ENCLOSING_TYPE (val)))
{
}
else
{
- value_ptr new_val;
- register value_ptr prev;
-
- new_val = (value_ptr) xrealloc (val, sizeof (struct value) + TYPE_LENGTH (new_encl_type));
+ struct value *new_val;
+ 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
extract and return the value of one of its (non-static) fields.
FIELDNO says which field. */
-value_ptr
-value_primitive_field (register value_ptr arg1, int offset,
- register int fieldno, register struct type *arg_type)
+struct value *
+value_primitive_field (struct value *arg1, int offset,
+ int fieldno, struct type *arg_type)
{
- register value_ptr v;
- register struct type *type;
+ struct value *v;
+ struct type *type;
CHECK_TYPEDEF (arg_type);
type = TYPE_FIELD_TYPE (arg_type, fieldno);
memcpy (VALUE_CONTENTS_RAW (v),
VALUE_CONTENTS_RAW (arg1) + offset,
TYPE_LENGTH (type));
- VALUE_OFFSET (v) = VALUE_OFFSET (arg1) + offset;
+ VALUE_OFFSET (v) = VALUE_OFFSET (arg1) + offset
+ + VALUE_EMBEDDED_OFFSET (arg1);
}
VALUE_LVAL (v) = VALUE_LVAL (arg1);
if (VALUE_LVAL (arg1) == lval_internalvar)
extract and return the value of one of its (non-static) fields.
FIELDNO says which field. */
-value_ptr
-value_field (register value_ptr arg1, register int fieldno)
+struct value *
+value_field (struct value *arg1, int fieldno)
{
return value_primitive_field (arg1, 0, fieldno, VALUE_TYPE (arg1));
}
/* Return a non-virtual function as a value.
F is the list of member functions which contains the desired method.
- J is an index into F which provides the desired method. */
+ J is an index into F which provides the desired method.
+
+ We only use the symbol for its address, so be happy with either a
+ full symbol or a minimal symbol.
+ */
-value_ptr
-value_fn_field (value_ptr *arg1p, struct fn_field *f, int j, struct type *type,
+struct value *
+value_fn_field (struct value **arg1p, struct fn_field *f, int j, struct type *type,
int offset)
{
- register value_ptr v;
- register struct type *ftype = TYPE_FN_FIELD_TYPE (f, j);
+ struct value *v;
+ struct type *ftype = TYPE_FN_FIELD_TYPE (f, j);
+ char *physname = TYPE_FN_FIELD_PHYSNAME (f, j);
struct symbol *sym;
+ struct minimal_symbol *msym;
- sym = lookup_symbol (TYPE_FN_FIELD_PHYSNAME (f, j),
- 0, VAR_NAMESPACE, 0, NULL);
- if (!sym)
- return NULL;
-/*
- error ("Internal error: could not find physical method named %s",
- TYPE_FN_FIELD_PHYSNAME (f, j));
- */
+ sym = lookup_symbol (physname, 0, VAR_DOMAIN, 0, NULL);
+ if (sym != NULL)
+ {
+ msym = NULL;
+ }
+ else
+ {
+ gdb_assert (sym == NULL);
+ msym = lookup_minimal_symbol (physname, NULL, NULL);
+ if (msym == NULL)
+ return NULL;
+ }
v = allocate_value (ftype);
- VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
- VALUE_TYPE (v) = ftype;
+ if (sym)
+ {
+ VALUE_ADDRESS (v) = BLOCK_START (SYMBOL_BLOCK_VALUE (sym));
+ }
+ else
+ {
+ VALUE_ADDRESS (v) = SYMBOL_VALUE_ADDRESS (msym);
+ }
if (arg1p)
{
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 value_ptr
-value_headof (value_ptr in_arg, struct type *btype, struct type *dtype)
-{
- /* First collect the vtables we must look at for this object. */
- value_ptr arg, 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. */
-
-value_ptr
-value_from_vtable_info (value_ptr 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);
-}
-
-/* Return true if the INDEXth field of TYPE is a virtual baseclass
- pointer which is for the base class whose type is BASECLASS. */
-
-static int
-vb_match (struct type *type, int index, struct type *basetype)
-{
- struct type *fieldtype;
- char *name = TYPE_FIELD_NAME (type, index);
- char *field_class_name = NULL;
-
- if (*name != '_')
- return 0;
- /* gcc 2.4 uses _vb$. */
- if (name[1] == 'v' && name[2] == 'b' && is_cplus_marker (name[3]))
- field_class_name = name + 4;
- /* gcc 2.5 will use __vb_. */
- if (name[1] == '_' && name[2] == 'v' && name[3] == 'b' && name[4] == '_')
- field_class_name = name + 5;
-
- if (field_class_name == NULL)
- /* This field is not a virtual base class pointer. */
- return 0;
-
- /* It's a virtual baseclass pointer, now we just need to find out whether
- it is for this baseclass. */
- fieldtype = TYPE_FIELD_TYPE (type, index);
- if (fieldtype == NULL
- || TYPE_CODE (fieldtype) != TYPE_CODE_PTR)
- /* "Can't happen". */
- return 0;
-
- /* What we check for is that either the types are equal (needed for
- nameless types) or have the same name. This is ugly, and a more
- elegant solution should be devised (which would probably just push
- the ugliness into symbol reading unless we change the stabs format). */
- if (TYPE_TARGET_TYPE (fieldtype) == basetype)
- return 1;
-
- if (TYPE_NAME (basetype) != NULL
- && TYPE_NAME (TYPE_TARGET_TYPE (fieldtype)) != NULL
- && STREQ (TYPE_NAME (basetype),
- TYPE_NAME (TYPE_TARGET_TYPE (fieldtype))))
- return 1;
- return 0;
-}
-
-/* Compute the offset of the baseclass which is
- the INDEXth baseclass of class TYPE,
- for value at VALADDR (in host) at ADDRESS (in target).
- The result is the offset of the baseclass value relative
- to (the address of)(ARG) + OFFSET.
-
- -1 is returned on error. */
-
-int
-baseclass_offset (struct type *type, int index, char *valaddr,
- CORE_ADDR address)
-{
- struct type *basetype = TYPE_BASECLASS (type, index);
-
- if (BASETYPE_VIA_VIRTUAL (type, index))
- {
- /* Must hunt for the pointer to this virtual baseclass. */
- register int i, len = TYPE_NFIELDS (type);
- register int n_baseclasses = TYPE_N_BASECLASSES (type);
-
- /* First look for the virtual baseclass pointer
- in the fields. */
- for (i = n_baseclasses; i < len; i++)
- {
- if (vb_match (type, i, basetype))
- {
- CORE_ADDR addr
- = unpack_pointer (TYPE_FIELD_TYPE (type, i),
- valaddr + (TYPE_FIELD_BITPOS (type, i) / 8));
-
- return addr - (LONGEST) address;
- }
- }
- /* Not in the fields, so try looking through the baseclasses. */
- for (i = index + 1; i < n_baseclasses; i++)
- {
- int boffset =
- baseclass_offset (type, i, valaddr, address);
- if (boffset)
- return boffset;
- }
- /* Not found. */
- return -1;
- }
-
- /* Baseclass is easily computed. */
- return TYPE_BASECLASS_BITPOS (type, index) / 8;
-}
\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;
\f
/* Convert C numbers into newly allocated values */
-value_ptr
-value_from_longest (struct type *type, register LONGEST num)
+struct value *
+value_from_longest (struct type *type, LONGEST num)
{
- register value_ptr val = allocate_value (type);
- register enum type_code code;
- register int len;
+ struct value *val = allocate_value (type);
+ enum type_code code;
+ int len;
retry:
code = TYPE_CODE (type);
len = TYPE_LENGTH (type);
/* Create a value representing a pointer of type TYPE to the address
ADDR. */
-value_ptr
+struct value *
value_from_pointer (struct type *type, CORE_ADDR addr)
{
- value_ptr val = allocate_value (type);
+ struct value *val = allocate_value (type);
store_typed_address (VALUE_CONTENTS_RAW (val), type, addr);
return val;
}
This is analogous to value_from_longest, which also does not
use inferior memory. String shall NOT contain embedded nulls. */
-value_ptr
+struct value *
value_from_string (char *ptr)
{
- value_ptr val;
+ struct value *val;
int len = strlen (ptr);
int lowbound = current_language->string_lower_bound;
struct type *rangetype =
return val;
}
-value_ptr
+struct value *
value_from_double (struct type *type, DOUBLEST num)
{
- register value_ptr val = allocate_value (type);
+ struct value *val = allocate_value (type);
struct type *base_type = check_typedef (type);
- register enum type_code code = TYPE_CODE (base_type);
- register int len = TYPE_LENGTH (base_type);
+ enum type_code code = TYPE_CODE (base_type);
+ int len = TYPE_LENGTH (base_type);
if (code == TYPE_CODE_FLT)
{
return val;
}
\f
-/* Deal with the value that is "about to be returned". */
-
-/* Return the value that a function returning now
- would be returning to its caller, assuming its type is VALTYPE.
- RETBUF is where we look for what ought to be the contents
- of the registers (in raw form). This is because it is often
- desirable to restore old values to those registers
- after saving the contents of interest, and then call
- this function using the saved values.
- struct_return is non-zero when the function in question is
- using the structure return conventions on the machine in question;
- 0 when it is using the value returning conventions (this often
- means returning pointer to where structure is vs. returning value). */
-
-/* ARGSUSED */
-value_ptr
-value_being_returned (struct type *valtype, char *retbuf, int struct_return)
+/* Deal with the value that is "about to be returned".
+
+ Return the value that a function, using the register convention,
+ returning now would be returning to its caller, assuming its type
+ is VALTYPE. RETBUF is where we look for what ought to be the
+ contents of the registers (in raw form). This is because it is
+ often desirable to restore old values to those registers after
+ saving the contents of interest, and then call this function using
+ the saved values. */
+
+struct value *
+register_value_being_returned (struct type *valtype, struct regcache *retbuf)
{
- register value_ptr val;
- CORE_ADDR addr;
-
- /* If this is not defined, just use EXTRACT_RETURN_VALUE instead. */
- if (EXTRACT_STRUCT_VALUE_ADDRESS_P ())
- if (struct_return)
- {
- addr = EXTRACT_STRUCT_VALUE_ADDRESS (retbuf);
- if (!addr)
- error ("Function return value unknown");
- return value_at (valtype, addr, NULL);
- }
-
- val = allocate_value (valtype);
+ struct value *val = allocate_value (valtype);
CHECK_TYPEDEF (valtype);
- EXTRACT_RETURN_VALUE (valtype, retbuf, VALUE_CONTENTS_RAW (val));
-
+ /* If the function returns void, don't bother fetching the return
+ value. */
+ if (TYPE_CODE (valtype) != TYPE_CODE_VOID)
+ EXTRACT_RETURN_VALUE (valtype, retbuf, VALUE_CONTENTS_RAW (val));
return val;
}
|| TYPE_LENGTH (value_type) == 8));
}
-/* Return true if the function specified is using the structure returning
- convention on this machine to return arguments, or 0 if it is using
- the value returning convention. FUNCTION is the value representing
- the function, FUNCADDR is the address of the function, and VALUE_TYPE
- is the type returned by the function. GCC_P is nonzero if compiled
+/* Return true if the function returning the specified type is using
+ the convention of returning structures in memory (passing in the
+ address as a hidden first parameter). GCC_P is nonzero if compiled
with GCC. */
-/* ARGSUSED */
int
-using_struct_return (value_ptr function, CORE_ADDR funcaddr,
- struct type *value_type, int gcc_p)
+using_struct_return (struct type *value_type, int gcc_p)
{
- register enum type_code code = TYPE_CODE (value_type);
+ enum type_code code = TYPE_CODE (value_type);
if (code == TYPE_CODE_ERROR)
error ("Function return type unknown.");
function wants to return. */
void
-set_return_value (value_ptr val)
+set_return_value (struct value *val)
{
struct type *type = check_typedef (VALUE_TYPE (val));
- register enum type_code code = TYPE_CODE (type);
+ enum type_code code = TYPE_CODE (type);
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.");
- STORE_RETURN_VALUE (type, VALUE_CONTENTS (val));
+ STORE_RETURN_VALUE (type, current_regcache, VALUE_CONTENTS (val));
}
\f
void