char *get_type_str(Dwarf_Die *die)
{
static char buf[256] = "";
char *ptr = NULL;
Dwarf_Die tdie;
Dwarf_Attribute attr;
if (!dwarf_attr(die, DW_AT_type, &attr))
return "void";
dwarf_formref_die(&attr, &tdie);
if (dwarf_tag(&tdie) == DW_TAG_array_type)
ptr = "[]";
else if (dwarf_tag(&tdie) == DW_TAG_pointer_type)
ptr = "*";
else
goto end_ok;
dwarf_attr(&tdie, DW_AT_type, &attr);
dwarf_formref_die(&attr, &tdie);
end_ok:
sprintf(buf, "%s%s", dwarf_diename(&tdie), (ptr) ? ptr : "");
return buf;
}
static int __die_walk_instances_cb(Dwarf_Die *inst, void *data)
{
struct __instance_walk_param *iwp = data;
Dwarf_Attribute attr_mem;
Dwarf_Die origin_mem;
Dwarf_Attribute *attr;
Dwarf_Die *origin;
int tmp;
attr = dwarf_attr(inst, DW_AT_abstract_origin, &attr_mem);
if (attr == NULL)
return DIE_FIND_CB_CONTINUE;
origin = dwarf_formref_die(attr, &origin_mem);
if (origin == NULL || origin->addr != iwp->addr)
return DIE_FIND_CB_CONTINUE;
/* Ignore redundant instances */
if (dwarf_tag(inst) == DW_TAG_inlined_subroutine) {
dwarf_decl_line(origin, &tmp);
if (die_get_call_lineno(inst) == tmp) {
tmp = die_get_decl_fileno(origin);
if (die_get_call_fileno(inst) == tmp)
return DIE_FIND_CB_CONTINUE;
}
}
iwp->retval = iwp->callback(inst, iwp->data);
return (iwp->retval) ? DIE_FIND_CB_END : DIE_FIND_CB_CONTINUE;
}
/**
* die_get_type - Get type DIE
* @vr_die: a DIE of a variable
* @die_mem: where to store a type DIE
*
* Get a DIE of the type of given variable (@vr_die), and store
* it to die_mem. Return NULL if fails to get a type DIE.
*/
Dwarf_Die *die_get_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
{
Dwarf_Attribute attr;
if (dwarf_attr_integrate(vr_die, DW_AT_type, &attr) &&
dwarf_formref_die(&attr, die_mem))
return die_mem;
else
return NULL;
}
static Dwarf_Off MC_dwarf_attr_dieoffset(Dwarf_Die * die, int attribute)
{
Dwarf_Attribute attr;
if (dwarf_hasattr_integrate(die, attribute) == 0)
return 0;
dwarf_attr_integrate(die, attribute, &attr);
Dwarf_Die subtype_die;
if (dwarf_formref_die(&attr, &subtype_die) == nullptr)
xbt_die("Could not find DIE");
return dwarf_dieoffset(&subtype_die);
}
static void
get_dwarf_attr(Dwarf_Die *parent, int attr, Dwarf_Attribute *attr_out,
Dwarf_Die *die_out)
{
if (dwarf_attr_integrate(parent, attr, attr_out) == NULL)
dwarf_err(EX_DATAERR, "dwarf_attr_integrate(%s/%d)",
dwarf_diename(parent), attr);
if (dwarf_formref_die(attr_out, die_out) == NULL)
dwarf_err(EX_DATAERR, "dwarf_formref_die(%s)",
dwarf_diename(parent));
}
/* Get type die, but skip qualifiers and typedef */
static Dwarf_Die *die_get_real_type(Dwarf_Die *vr_die, Dwarf_Die *die_mem)
{
Dwarf_Attribute attr;
int tag;
do {
if (dwarf_attr(vr_die, DW_AT_type, &attr) == NULL ||
dwarf_formref_die(&attr, die_mem) == NULL)
return NULL;
tag = dwarf_tag(die_mem);
vr_die = die_mem;
} while (tag == DW_TAG_const_type ||
tag == DW_TAG_restrict_type ||
tag == DW_TAG_volatile_type ||
tag == DW_TAG_shared_type ||
tag == DW_TAG_typedef);
return die_mem;
}
static void
print_vars (unsigned int indent, Dwarf_Die *die)
{
Dwarf_Die child;
if (dwarf_child (die, &child) == 0)
do
switch (dwarf_tag (&child))
{
case DW_TAG_variable:
case DW_TAG_formal_parameter:
printf ("%*s%-30s[%6" PRIx64 "]\n", indent, "",
dwarf_diename (&child),
(uint64_t) dwarf_dieoffset (&child));
break;
default:
break;
}
while (dwarf_siblingof (&child, &child) == 0);
Dwarf_Attribute attr_mem;
Dwarf_Die origin;
if (dwarf_hasattr (die, DW_AT_abstract_origin)
&& dwarf_formref_die (dwarf_attr (die, DW_AT_abstract_origin, &attr_mem),
&origin) != NULL
&& dwarf_child (&origin, &child) == 0)
do
switch (dwarf_tag (&child))
{
case DW_TAG_variable:
case DW_TAG_formal_parameter:
printf ("%*s%s (abstract)\n", indent, "",
dwarf_diename (&child));
break;
default:
break;
}
while (dwarf_siblingof (&child, &child) == 0);
}
int
ia64_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
{
/* Start with the function's type, and get the DW_AT_type attribute,
which is the type of the return value. */
Dwarf_Attribute attr_mem;
Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type,
&attr_mem);
if (attr == NULL)
/* The function has no return value, like a `void' function in C. */
return 0;
Dwarf_Die die_mem;
Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
int tag = DWARF_TAG_OR_RETURN (typedie);
/* Follow typedefs and qualifiers to get to the actual type. */
while (tag == DW_TAG_typedef
|| tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
|| tag == DW_TAG_restrict_type || tag == DW_TAG_mutable_type)
{
attr = dwarf_attr (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = DWARF_TAG_OR_RETURN (typedie);
}
Dwarf_Word size;
switch (tag)
{
case -1:
return -1;
case DW_TAG_subrange_type:
if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
{
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = DWARF_TAG_OR_RETURN (typedie);
}
/* Fall through. */
case DW_TAG_base_type:
case DW_TAG_enumeration_type:
case DW_TAG_pointer_type:
case DW_TAG_ptr_to_member_type:
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
&attr_mem), &size) != 0)
{
if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
size = 8;
else
return -1;
}
if (tag == DW_TAG_base_type)
{
Dwarf_Word encoding;
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
&attr_mem),
&encoding) != 0)
return -1;
switch (encoding)
{
case DW_ATE_float:
switch (size)
{
case 4: /* float */
*locp = loc_fpreg_4;
return nloc_fpreg;
case 8: /* double */
*locp = loc_fpreg_8;
return nloc_fpreg;
case 10: /* x86-style long double, not really used */
*locp = loc_fpreg_10;
return nloc_fpreg;
case 16: /* long double, IEEE quad format */
*locp = loc_intreg;
return nloc_intregs (2);
}
return -2;
case DW_ATE_complex_float:
switch (size)
{
case 4 * 2: /* complex float */
*locp = loc_fpreg_4;
return nloc_fpregs (2);
case 8 * 2: /* complex double */
*locp = loc_fpreg_8;
return nloc_fpregs (2);
case 10 * 2: /* complex long double (x86-style) */
*locp = loc_fpreg_10;
return nloc_fpregs (2);
case 16 * 2: /* complex long double (IEEE quad) */
*locp = loc_intreg;
return nloc_intregs (4);
}
return -2;
}
}
intreg:
*locp = loc_intreg;
if (size <= 8)
return nloc_intreg;
if (size <= 32)
return nloc_intregs ((size + 7) / 8);
large:
*locp = loc_aggregate;
return nloc_aggregate;
case DW_TAG_structure_type:
case DW_TAG_class_type:
case DW_TAG_union_type:
case DW_TAG_array_type:
if (dwarf_aggregate_size (typedie, &size) != 0)
return -1;
/* If this qualifies as an homogeneous floating-point aggregate
(HFA), then it should be returned in FP regs. */
int nfpreg = hfa_type (typedie, size, locp, 0);
if (nfpreg < 0)
return nfpreg;
else if (nfpreg > 0 && nfpreg <= 8)
return nfpreg == 1 ? nloc_fpreg : nloc_fpregs (nfpreg);
if (size > 32)
goto large;
goto intreg;
}
/* XXX We don't have a good way to return specific errors from ebl calls.
This value means we do not understand the type, but it is well-formed
DWARF and might be valid. */
return -2;
}
int
main (int argc, char *argv[])
{
for (int i = 1; i < argc; ++i)
{
int fd = open (argv[i], O_RDONLY);
Dwarf *dbg = dwarf_begin (fd, DWARF_C_READ);
if (dbg != NULL)
{
Dwarf_Off off = 0;
size_t cuhl;
Dwarf_Off noff;
while (dwarf_nextcu (dbg, off, &noff, &cuhl, NULL, NULL, NULL) == 0)
{
Dwarf_Die die_mem;
Dwarf_Die *die = dwarf_offdie (dbg, off + cuhl, &die_mem);
Dwarf_Die iter_mem;
Dwarf_Die *iter = &iter_mem;
dwarf_child (die, &iter_mem);
while (1)
{
if (dwarf_tag (iter) == DW_TAG_variable)
{
Dwarf_Attribute attr_mem;
Dwarf_Die form_mem;
dwarf_formref_die (dwarf_attr (iter, DW_AT_type,
&attr_mem),
&form_mem);
}
if (dwarf_siblingof (iter, &iter_mem) != 0)
break;
}
off = noff;
}
off = 0;
uint64_t type_sig;
while (dwarf_next_unit (dbg, off, &noff, &cuhl, NULL, NULL, NULL,
NULL, &type_sig, NULL) == 0)
{
Dwarf_Die die_mem;
Dwarf_Die *die = dwarf_offdie_types (dbg, off + cuhl, &die_mem);
if (die == NULL)
printf ("fail\n");
else
printf ("ok\n");
off = noff;
}
dwarf_end (dbg);
}
close (fd);
}
}
int
ppc_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
{
/* Start with the function's type, and get the DW_AT_type attribute,
which is the type of the return value. */
Dwarf_Attribute attr_mem;
Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type,
&attr_mem);
if (attr == NULL)
/* The function has no return value, like a `void' function in C. */
return 0;
Dwarf_Die die_mem;
Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
int tag = dwarf_tag (typedie);
/* Follow typedefs and qualifiers to get to the actual type. */
while (tag == DW_TAG_typedef
|| tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
|| tag == DW_TAG_restrict_type || tag == DW_TAG_mutable_type)
{
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = dwarf_tag (typedie);
}
Dwarf_Word size;
switch (tag)
{
case -1:
return -1;
case DW_TAG_subrange_type:
if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
{
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = dwarf_tag (typedie);
}
/* Fall through. */
case DW_TAG_base_type:
case DW_TAG_enumeration_type:
case DW_TAG_pointer_type:
case DW_TAG_ptr_to_member_type:
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
&attr_mem), &size) != 0)
{
if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
size = 4;
else
return -1;
}
if (size <= 8)
{
if (tag == DW_TAG_base_type)
{
Dwarf_Word encoding;
if (dwarf_formudata (dwarf_attr_integrate (typedie,
DW_AT_encoding,
&attr_mem),
&encoding) != 0)
return -1;
if (encoding == DW_ATE_float)
{
*locp = loc_fpreg;
return nloc_fpreg;
}
}
intreg:
*locp = loc_intreg;
return size <= 4 ? nloc_intreg : nloc_intregpair;
}
aggregate:
*locp = loc_aggregate;
return nloc_aggregate;
case DW_TAG_array_type:
{
bool is_vector;
if (dwarf_formflag (dwarf_attr_integrate (typedie, DW_AT_GNU_vector,
&attr_mem), &is_vector) == 0
&& is_vector
&& dwarf_aggregate_size (typedie, &size) == 0)
switch (size)
{
case 16:
if (ppc_altivec_abi ())
{
*locp = loc_vmxreg;
return nloc_vmxreg;
}
*locp = loc_intreg;
return nloc_intregquad;
}
}
/* Fall through. */
case DW_TAG_structure_type:
case DW_TAG_class_type:
case DW_TAG_union_type:
if (SVR4_STRUCT_RETURN
&& dwarf_aggregate_size (typedie, &size) == 0
&& size > 0 && size <= 8)
goto intreg;
goto aggregate;
}
/* XXX We don't have a good way to return specific errors from ebl calls.
This value means we do not understand the type, but it is well-formed
DWARF and might be valid. */
return -2;
}
static struct variable* analyze_variable(Dwarf_Die *die, Dwarf_Files *files,
struct expr_context *ctx)
{
int ret;
Dwarf_Attribute at;
struct variable* var;
/* ignore declarations */
if (dwarf_attr_integrate(die, DW_AT_declaration, &at) != NULL)
{
bool flag;
ret = dwarf_formflag(&at, &flag);
fail_if(ret == -1, "dwarf_formflag");
if (flag)
return NULL;
}
var = xalloc(sizeof(struct variable));
analyze_name_location(die, files, &var->name, &var->loc);
if (dwarf_attr_integrate(die, DW_AT_type, &at) != NULL)
{
Dwarf_Die type_die;
if (dwarf_formref_die(&at, &type_die) == NULL)
fail("dwarf_formref_die");
analyze_type(&type_die, &(var->type));
}
if (dwarf_attr_integrate(die, DW_AT_const_value, &at) != NULL)
{
Dwarf_Word w;
Dwarf_Block bl;
unsigned int form = dwarf_whatform(&at);
debug("variable %s has constant value of form %x", var->name, form);
if (dwarf_formudata(&at, &w) == 0)
{
fail_if(sizeof(w) < var->type.width, "constant value too small");
var->value = xalloc(var->type.width);
memcpy(var->value, &w, var->type.width);
}
else if (dwarf_formblock(&at, &bl) == 0)
{
fail_if(bl.length < var->type.width, "constant value too small");
var->value = xalloc(var->type.width);
memcpy(var->value, bl.data, var->type.width);
}
else
{
warn("unable to get constant value of variable %x (form %x)", var->name, form);
}
}
else if (dwarf_attr_integrate(die, DW_AT_location, &at) != NULL)
{
size_t exprlen;
Dwarf_Op *expr;
ret = dwarf_getlocation_addr(&at, ctx->ip, &expr, &exprlen, 1);
if (ret != 1)
{
if (ret == -1)
/* it seems that elfutils have some kind of problem with
* DW_OP_GNU_entry_value but that operation is useless for us
* anyway */
warn("cannot get location for variable %s (ip: %lx), %s", var->name, ctx->ip, dwarf_errmsg(-1));
else if (ret == 0)
debug("no location available for variable %s (ip: %lx)", var->name, ctx->ip);
else
fail("unreachable reached");
return var;
}
var->value = evaluate_loc_expr(expr, exprlen, ctx, var->type.width);
}
return var;
}
int
arm_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
{
/* Start with the function's type, and get the DW_AT_type attribute,
which is the type of the return value. */
Dwarf_Attribute attr_mem;
Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type,
&attr_mem);
if (attr == NULL)
/* The function has no return value, like a `void' function in C. */
return 0;
Dwarf_Die die_mem;
Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
int tag = DWARF_TAG_OR_RETURN (typedie);
/* Follow typedefs and qualifiers to get to the actual type. */
while (tag == DW_TAG_typedef
|| tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
|| tag == DW_TAG_restrict_type || tag == DW_TAG_mutable_type)
{
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = DWARF_TAG_OR_RETURN (typedie);
}
Dwarf_Word size;
switch (tag)
{
case -1:
return -1;
case DW_TAG_subrange_type:
if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
{
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = DWARF_TAG_OR_RETURN (typedie);
}
/* Fall through. */
case DW_TAG_base_type:
case DW_TAG_enumeration_type:
case DW_TAG_pointer_type:
case DW_TAG_ptr_to_member_type:
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
&attr_mem), &size) != 0)
{
if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
size = 4;
else
return -1;
}
if (size <= 16)
{
intreg:
*locp = loc_intreg;
return size <= 4 ? nloc_intreg : nloc_intregs ((size + 3) / 4);
}
aggregate:
*locp = loc_aggregate;
return nloc_aggregate;
case DW_TAG_structure_type:
case DW_TAG_class_type:
case DW_TAG_union_type:
case DW_TAG_array_type:
if (dwarf_aggregate_size (typedie, &size) == 0
&& size > 0 && size <= 4)
goto intreg;
goto aggregate;
}
/* XXX We don't have a good way to return specific errors from ebl calls.
This value means we do not understand the type, but it is well-formed
DWARF and might be valid. */
return -2;
}
int
x86_64_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
{
/* Start with the function's type, and get the DW_AT_type attribute,
which is the type of the return value. */
Dwarf_Attribute attr_mem;
Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type,
&attr_mem);
if (attr == NULL)
/* The function has no return value, like a `void' function in C. */
return 0;
Dwarf_Die die_mem;
Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
int tag = DWARF_TAG_OR_RETURN (typedie);
/* Follow typedefs and qualifiers to get to the actual type. */
while (tag == DW_TAG_typedef
|| tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
|| tag == DW_TAG_restrict_type || tag == DW_TAG_mutable_type)
{
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = DWARF_TAG_OR_RETURN (typedie);
}
Dwarf_Word size;
switch (tag)
{
case -1:
return -1;
case DW_TAG_subrange_type:
if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
{
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = DWARF_TAG_OR_RETURN (typedie);
}
/* Fall through. */
case DW_TAG_base_type:
case DW_TAG_enumeration_type:
case DW_TAG_pointer_type:
case DW_TAG_ptr_to_member_type:
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
&attr_mem), &size) != 0)
{
if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
size = 8;
else
return -1;
}
if (tag == DW_TAG_base_type)
{
Dwarf_Word encoding;
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
&attr_mem),
&encoding) != 0)
return -1;
switch (encoding)
{
case DW_ATE_complex_float:
switch (size)
{
case 4 * 2: /* complex float */
case 8 * 2: /* complex double */
*locp = loc_ssereg;
return nloc_sseregpair;
case 16 * 2: /* complex long double */
*locp = loc_x87reg;
return nloc_x87regpair;
}
return -2;
case DW_ATE_float:
switch (size)
{
case 4: /* float */
case 8: /* double */
*locp = loc_ssereg;
return nloc_ssereg;
case 16: /* long double */
/* XXX distinguish __float128, which is sseregpair?? */
*locp = loc_x87reg;
return nloc_x87reg;
}
return -2;
}
}
intreg:
*locp = loc_intreg;
if (size <= 8)
return nloc_intreg;
if (size <= 16)
return nloc_intregpair;
large:
*locp = loc_aggregate;
return nloc_aggregate;
case DW_TAG_structure_type:
case DW_TAG_class_type:
case DW_TAG_union_type:
case DW_TAG_array_type:
if (dwarf_aggregate_size (typedie, &size) != 0)
goto large;
if (size > 16)
goto large;
/* XXX
Must examine the fields in picayune ways to determine the
actual answer. This will be right for small C structs
containing integer types and similarly simple cases.
*/
goto intreg;
}
/* XXX We don't have a good way to return specific errors from ebl calls.
This value means we do not understand the type, but it is well-formed
DWARF and might be valid. */
return -2;
}
struct refl_object *
refl_access (struct refl *refl, struct refl_object *obj, char const *lookfor)
{
assert (refl != NULL);
assert (obj != NULL);
assert (lookfor != NULL);
struct refl_type *type = obj->type;
assert (type != NULL);
Dwarf_Die die_mem, *die = &die_mem;
if (dwarf_child (&type->die, &die_mem))
{
err:
__refl_seterr (REFL_E_DWARF);
return NULL;
}
for (; die != NULL; checked_siblingof (&die, &die_mem))
{
if (dwarf_tag (die) != DW_TAG_member)
continue;
Dwarf_Attribute attr_mem, *attr = dwarf_attr (die, DW_AT_name, &attr_mem);
if (attr == NULL)
goto err;
char const *name = dwarf_formstring (attr);
if (name == NULL)
{
err2:
__refl_seterr (REFL_E_DWARF);
return NULL;
}
if (strcmp (name, lookfor) != 0)
continue;
attr = dwarf_attr (die, DW_AT_data_member_location, &attr_mem);
if (attr == NULL)
goto err;
Dwarf_Word location;
if (dwarf_formudata (attr, &location) != 0)
goto err2;
attr = dwarf_attr (die, DW_AT_type, &attr_mem);
if (attr == NULL)
goto err;
Dwarf_Die tdie_mem, *tdie = dwarf_formref_die (attr, &tdie_mem);
if (tdie == NULL)
goto err2;
struct refl_type *field_type = __refl_type_begin (tdie);
if (field_type == NULL)
return NULL;
struct refl_object *result
= __refl_object_begin (field_type, (char *)obj->data + location);
if (result == NULL)
__refl_type_free (field_type);
return result;
}
return NULL;
}
/* If this type is an HFA small enough to be returned in FP registers,
return the number of registers to use. Otherwise 9, or -1 for errors. */
static int
hfa_type (Dwarf_Die *typedie, Dwarf_Word size,
const Dwarf_Op **locp, int fpregs_used)
{
/* Descend the type structure, counting elements and finding their types.
If we find a datum that's not an FP type (and not quad FP), punt.
If we find a datum that's not the same FP type as the first datum, punt.
If we count more than eight total homogeneous FP data, punt. */
inline int hfa (const Dwarf_Op *loc, int nregs)
{
if (fpregs_used == 0)
*locp = loc;
else if (*locp != loc)
return 9;
return fpregs_used + nregs;
}
int tag = DWARF_TAG_OR_RETURN (typedie);
switch (tag)
{
Dwarf_Attribute attr_mem;
case -1:
return -1;
case DW_TAG_base_type:;
Dwarf_Word encoding;
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
&attr_mem), &encoding) != 0)
return -1;
switch (encoding)
{
case DW_ATE_float:
switch (size)
{
case 4: /* float */
return hfa (loc_fpreg_4, 1);
case 8: /* double */
return hfa (loc_fpreg_8, 1);
case 10: /* x86-style long double, not really used */
return hfa (loc_fpreg_10, 1);
}
break;
case DW_ATE_complex_float:
switch (size)
{
case 4 * 2: /* complex float */
return hfa (loc_fpreg_4, 2);
case 8 * 2: /* complex double */
return hfa (loc_fpreg_8, 2);
case 10 * 2: /* complex long double (x86-style) */
return hfa (loc_fpreg_10, 2);
}
break;
}
break;
case DW_TAG_structure_type:
case DW_TAG_class_type:
case DW_TAG_union_type:;
Dwarf_Die child_mem;
switch (dwarf_child (typedie, &child_mem))
{
default:
return -1;
case 1: /* No children: empty struct. */
break;
case 0:; /* Look at each element. */
int max_used = fpregs_used;
do
switch (dwarf_tag (&child_mem))
{
case -1:
return -1;
case DW_TAG_member:;
Dwarf_Die child_type_mem;
Dwarf_Die *child_typedie
= dwarf_formref_die (dwarf_attr_integrate (&child_mem,
DW_AT_type,
&attr_mem),
&child_type_mem);
Dwarf_Word child_size;
if (dwarf_aggregate_size (child_typedie, &child_size) != 0)
return -1;
if (tag == DW_TAG_union_type)
{
int used = hfa_type (child_typedie, child_size,
locp, fpregs_used);
if (used < 0 || used > 8)
return used;
if (used > max_used)
max_used = used;
}
else
{
fpregs_used = hfa_type (child_typedie, child_size,
locp, fpregs_used);
if (fpregs_used < 0 || fpregs_used > 8)
return fpregs_used;
}
}
while (dwarf_siblingof (&child_mem, &child_mem) == 0);
if (tag == DW_TAG_union_type)
fpregs_used = max_used;
break;
}
break;
case DW_TAG_array_type:
if (size == 0)
break;
Dwarf_Die base_type_mem;
Dwarf_Die *base_typedie
= dwarf_formref_die (dwarf_attr_integrate (typedie, DW_AT_type,
&attr_mem),
&base_type_mem);
Dwarf_Word base_size;
if (dwarf_aggregate_size (base_typedie, &base_size) != 0)
return -1;
int used = hfa_type (base_typedie, base_size, locp, 0);
if (used < 0 || used > 8)
return used;
if (size % (*locp)[1].number != 0)
return 0;
fpregs_used += used * (size / (*locp)[1].number);
break;
default:
return 9;
}
return fpregs_used;
}
int
ppc64_return_value_location (Dwarf_Die *functypedie, const Dwarf_Op **locp)
{
/* Start with the function's type, and get the DW_AT_type attribute,
which is the type of the return value. */
Dwarf_Attribute attr_mem;
Dwarf_Attribute *attr = dwarf_attr_integrate (functypedie, DW_AT_type,
&attr_mem);
if (attr == NULL)
/* The function has no return value, like a `void' function in C. */
return 0;
Dwarf_Die die_mem;
Dwarf_Die *typedie = dwarf_formref_die (attr, &die_mem);
int tag = dwarf_tag (typedie);
/* Follow typedefs and qualifiers to get to the actual type. */
while (tag == DW_TAG_typedef
|| tag == DW_TAG_const_type || tag == DW_TAG_volatile_type
|| tag == DW_TAG_restrict_type || tag == DW_TAG_mutable_type)
{
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = dwarf_tag (typedie);
}
Dwarf_Word size;
switch (tag)
{
case -1:
return -1;
case DW_TAG_subrange_type:
if (! dwarf_hasattr_integrate (typedie, DW_AT_byte_size))
{
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = dwarf_tag (typedie);
}
/* Fall through. */
case DW_TAG_base_type:
case DW_TAG_enumeration_type:
case DW_TAG_pointer_type:
case DW_TAG_ptr_to_member_type:
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
&attr_mem), &size) != 0)
{
if (tag == DW_TAG_pointer_type || tag == DW_TAG_ptr_to_member_type)
size = 8;
else
return -1;
}
if (tag == DW_TAG_base_type)
{
Dwarf_Word encoding;
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_encoding,
&attr_mem),
&encoding) != 0)
return -1;
if (encoding == DW_ATE_float || encoding == DW_ATE_complex_float)
{
*locp = loc_fpreg;
if (size <= 8)
return nloc_fpreg;
if (size <= 16)
return nloc_fp2regs;
if (size <= 32)
return nloc_fp4regs;
}
}
if (size <= 8)
{
intreg:
*locp = loc_intreg;
return nloc_intreg;
}
/* Else fall through. */
case DW_TAG_structure_type:
case DW_TAG_class_type:
case DW_TAG_union_type:
aggregate:
*locp = loc_aggregate;
return nloc_aggregate;
case DW_TAG_string_type:
case DW_TAG_array_type:
if (dwarf_formudata (dwarf_attr_integrate (typedie, DW_AT_byte_size,
&attr_mem), &size) == 0
&& size <= 8)
{
if (tag == DW_TAG_array_type)
{
/* Check if it's a character array. */
attr = dwarf_attr_integrate (typedie, DW_AT_type, &attr_mem);
typedie = dwarf_formref_die (attr, &die_mem);
tag = dwarf_tag (typedie);
if (tag != DW_TAG_base_type)
goto aggregate;
if (dwarf_formudata (dwarf_attr_integrate (typedie,
DW_AT_byte_size,
&attr_mem),
&size) != 0)
return -1;
if (size != 1)
goto aggregate;
}
goto intreg;
}
goto aggregate;
}
/* XXX We don't have a good way to return specific errors from ebl calls.
This value means we do not understand the type, but it is well-formed
DWARF and might be valid. */
return -2;
}
static void analyze_type(Dwarf_Die *die, struct type *ty)
{
int ret;
Dwarf_Attribute at;
/* find out the values of name, byte_size and type attributes
* even though not all of them make sense for all tags
*/
char *name = NULL;
if (dwarf_attr(die, DW_AT_name, &at) != NULL)
{
name = xstrdup(dwarf_formstring(&at));
}
struct type sub_type = { .name = NULL, .width = 0 };
if (dwarf_attr(die, DW_AT_type, &at) != NULL)
{
Dwarf_Die sub_die;
if (dwarf_formref_die(&at, &sub_die) != NULL)
analyze_type(&sub_die, &sub_type);
}
Dwarf_Word width = 0;
if (dwarf_attr(die, DW_AT_byte_size, &at) != NULL)
{
ret = dwarf_formudata(&at, &width);
fail_if(ret == -1, "dwarf_formudata");
}
switch (dwarf_tag(die))
{
case DW_TAG_base_type:
ty->name = name;
name = NULL;
ty->width = (unsigned)width;
/* TODO: what about encoding? */
break;
/* type modifiers */
case DW_TAG_const_type:
ty->name = xsprintf("const %s", sub_type.name ?: "void");
ty->width = sub_type.width;
break;
case DW_TAG_pointer_type:
ty->width = (unsigned)width;
ty->name = xsprintf("%s*", sub_type.name ?: "void");
break;
case DW_TAG_restrict_type:
ty->name = xsprintf("%s restrict", sub_type.name ?: "void");
ty->width = sub_type.width;
break;
case DW_TAG_volatile_type:
ty->name = xsprintf("volatile %s", sub_type.name ?: "void");
ty->width = sub_type.width;
break;
case DW_TAG_typedef:
ty->name = name;
name = NULL;
ty->width = sub_type.width;
break;
case DW_TAG_array_type:
ty->name = xsprintf("%s[]", sub_type.name);
ty->width = POINTER_SIZE;
break;
case DW_TAG_structure_type:
if (name)
ty->name = xsprintf("struct %s", name);
else
ty->name = xstrdup("struct");
ty->width = (unsigned)width;
break;
case DW_TAG_union_type:
if (name)
ty->name = xsprintf("union %s", name);
else
ty->name = xstrdup("union");
ty->width = (unsigned)width;
break;
case DW_TAG_class_type:
ty->name = xsprintf("class %s", name);
ty->width = (unsigned)width;
break;
case DW_TAG_enumeration_type:
ty->name = xsprintf("enum %s", name);
ty->width = (unsigned)width;
break;
case DW_TAG_subroutine_type:
ty->name = xstrdup("FUNCTION");
ty->width = 0; /* TODO */
break;
default:
warn("Unknown type 0x%x named %s with width %u", dwarf_tag(die), name, (unsigned)width);
break;
}
free(sub_type.name);
free(name);
}
void analyze_name_location(Dwarf_Die *die, Dwarf_Files *files,
char **name, struct location* loc)
{
int ret;
Dwarf_Attribute at;
Dwarf_Word w;
if (dwarf_attr_integrate(die, DW_AT_name, &at) != NULL)
{
*name = xstrdup(dwarf_formstring(&at));
}
if (dwarf_attr_integrate(die, DW_AT_decl_file, &at) != NULL)
{
ret = dwarf_formudata(&at, &w);
fail_if(ret == -1, "dwarf_formudata");
loc->file = xstrdup(dwarf_filesrc(files, (size_t)w, NULL, NULL));
}
if (dwarf_attr_integrate(die, DW_AT_decl_line, &at) != NULL)
{
ret = dwarf_formudata(&at, &w);
fail_if(ret == -1, "dwarf_formudata");
loc->line = (unsigned)w;
}
}
