/*
SPDX-License-Identifier: GPL-2.0-only
Copyright (C) 2008 Arnaldo Carvalho de Melo <acme@redhat.com>
*/
#include <assert.h>
#include <dirent.h>
#include <dwarf.h>
#include <elfutils/libdwfl.h>
#include <errno.h>
#include <fcntl.h>
#include <fnmatch.h>
#include <libelf.h>
#include <obstack.h>
#include <search.h>
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <unistd.h>
#include "config.h"
#include "list.h"
#include "dwarves.h"
#include "dutil.h"
#include "strings.h"
#include "hash.h"
struct strings *strings;
#ifndef DW_AT_GNU_vector
#define DW_AT_GNU_vector 0x2107
#endif
#ifndef DW_TAG_GNU_call_site
#define DW_TAG_GNU_call_site 0x4109
#define DW_TAG_GNU_call_site_parameter 0x410a
#endif
#define hashtags__fn(key) hash_64(key, HASHTAGS__BITS)
bool no_bitfield_type_recode = true;
static void __tag__print_not_supported(uint32_t tag, const char *func)
{
static bool dwarf_tags_warned[DW_TAG_GNU_call_site_parameter + 64];
if (tag < sizeof(dwarf_tags_warned)) {
if (dwarf_tags_warned[tag])
return;
dwarf_tags_warned[tag] = true;
}
fprintf(stderr, "%s: tag not supported %#x (%s)!\n", func,
tag, dwarf_tag_name(tag));
}
#define tag__print_not_supported(tag) \
__tag__print_not_supported(tag, __func__)
struct dwarf_off_ref {
unsigned int from_types : 1;
Dwarf_Off off;
};
typedef struct dwarf_off_ref dwarf_off_ref;
struct dwarf_tag {
struct hlist_node hash_node;
dwarf_off_ref type;
Dwarf_Off id;
union {
dwarf_off_ref abstract_origin;
dwarf_off_ref containing_type;
};
struct tag *tag;
uint32_t small_id;
strings_t decl_file;
uint16_t decl_line;
};
static dwarf_off_ref dwarf_tag__spec(struct dwarf_tag *dtag)
{
return *(dwarf_off_ref *)(dtag + 1);
}
static void dwarf_tag__set_spec(struct dwarf_tag *dtag, dwarf_off_ref spec)
{
*(dwarf_off_ref *)(dtag + 1) = spec;
}
#define HASHTAGS__BITS 8
#define HASHTAGS__SIZE (1UL << HASHTAGS__BITS)
#define obstack_chunk_alloc malloc
#define obstack_chunk_free free
static void *obstack_zalloc(struct obstack *obstack, size_t size)
{
void *o = obstack_alloc(obstack, size);
if (o)
memset(o, 0, size);
return o;
}
struct dwarf_cu {
struct hlist_head hash_tags[HASHTAGS__SIZE];
struct hlist_head hash_types[HASHTAGS__SIZE];
struct obstack obstack;
struct cu *cu;
struct dwarf_cu *type_unit;
};
static void dwarf_cu__init(struct dwarf_cu *dcu)
{
unsigned int i;
for (i = 0; i < HASHTAGS__SIZE; ++i) {
INIT_HLIST_HEAD(&dcu->hash_tags[i]);
INIT_HLIST_HEAD(&dcu->hash_types[i]);
}
obstack_init(&dcu->obstack);
dcu->type_unit = NULL;
}
static void hashtags__hash(struct hlist_head *hashtable,
struct dwarf_tag *dtag)
{
struct hlist_head *head = hashtable + hashtags__fn(dtag->id);
hlist_add_head(&dtag->hash_node, head);
}
static struct dwarf_tag *hashtags__find(const struct hlist_head *hashtable,
const Dwarf_Off id)
{
if (id == 0)
return NULL;
struct dwarf_tag *tpos;
struct hlist_node *pos;
uint16_t bucket = hashtags__fn(id);
const struct hlist_head *head = hashtable + bucket;
hlist_for_each_entry(tpos, pos, head, hash_node) {
if (tpos->id == id)
return tpos;
}
return NULL;
}
static void cu__hash(struct cu *cu, struct tag *tag)
{
struct dwarf_cu *dcu = cu->priv;
struct hlist_head *hashtable = tag__is_tag_type(tag) ?
dcu->hash_types :
dcu->hash_tags;
hashtags__hash(hashtable, tag->priv);
}
static struct dwarf_tag *dwarf_cu__find_tag_by_ref(const struct dwarf_cu *cu,
const struct dwarf_off_ref *ref)
{
if (cu == NULL)
return NULL;
if (ref->from_types) {
return NULL;
}
return hashtags__find(cu->hash_tags, ref->off);
}
static struct dwarf_tag *dwarf_cu__find_type_by_ref(const struct dwarf_cu *dcu,
const struct dwarf_off_ref *ref)
{
if (dcu == NULL)
return NULL;
if (ref->from_types) {
dcu = dcu->type_unit;
if (dcu == NULL) {
return NULL;
}
}
return hashtags__find(dcu->hash_types, ref->off);
}
extern struct strings *strings;
static void *memdup(const void *src, size_t len, struct cu *cu)
{
void *s = obstack_alloc(&cu->obstack, len);
if (s != NULL)
memcpy(s, src, len);
return s;
}
/* Number decoding macros. See 7.6 Variable Length Data. */
#define get_uleb128_step(var, addr, nth, break) \
__b = *(addr)++; \
var |= (uintmax_t) (__b & 0x7f) << (nth * 7); \
if ((__b & 0x80) == 0) \
break
#define get_uleb128_rest_return(var, i, addrp) \
do { \
for (; i < 10; ++i) { \
get_uleb128_step(var, *addrp, i, \
return var); \
} \
/* Other implementations set VALUE to UINT_MAX in this \
case. So we better do this as well. */ \
return UINT64_MAX; \
} while (0)
static uint64_t __libdw_get_uleb128(uint64_t acc, uint32_t i,
const uint8_t **addrp)
{
uint8_t __b;
get_uleb128_rest_return (acc, i, addrp);
}
#define get_uleb128(var, addr) \
do { \
uint8_t __b; \
var = 0; \
get_uleb128_step(var, addr, 0, break); \
var = __libdw_get_uleb128 (var, 1, &(addr)); \
} while (0)
static uint64_t attr_numeric(Dwarf_Die *die, uint32_t name)
{
Dwarf_Attribute attr;
uint32_t form;
if (dwarf_attr(die, name, &attr) == NULL)
return 0;
form = dwarf_whatform(&attr);
switch (form) {
case DW_FORM_addr: {
Dwarf_Addr addr;
if (dwarf_formaddr(&attr, &addr) == 0)
return addr;
}
break;
case DW_FORM_data1:
case DW_FORM_data2:
case DW_FORM_data4:
case DW_FORM_data8:
case DW_FORM_sdata:
case DW_FORM_udata: {
Dwarf_Word value;
if (dwarf_formudata(&attr, &value) == 0)
return value;
}
break;
case DW_FORM_flag:
case DW_FORM_flag_present: {
bool value;
if (dwarf_formflag(&attr, &value) == 0)
return value;
}
break;
default:
fprintf(stderr, "DW_AT_<0x%x>=0x%x\n", name, form);
break;
}
return 0;
}
static uint64_t dwarf_expr(const uint8_t *expr, uint32_t len __unused)
{
/* Common case: offset from start of the class */
if (expr[0] == DW_OP_plus_uconst ||
expr[0] == DW_OP_constu) {
uint64_t result;
++expr;
get_uleb128(result, expr);
return result;
}
fprintf(stderr, "%s: unhandled %#x DW_OP_ operation\n",
__func__, *expr);
return UINT64_MAX;
}
static Dwarf_Off attr_offset(Dwarf_Die *die, const uint32_t name)
{
Dwarf_Attribute attr;
Dwarf_Block block;
if (dwarf_attr(die, name, &attr) == NULL)
return 0;
switch (dwarf_whatform(&attr)) {
case DW_FORM_data1:
case DW_FORM_data2:
case DW_FORM_data4:
case DW_FORM_data8:
case DW_FORM_sdata:
case DW_FORM_udata: {
Dwarf_Word value;
if (dwarf_formudata(&attr, &value) == 0)
return value;
break;
}
default:
if (dwarf_formblock(&attr, &block) == 0)
return dwarf_expr(block.data, block.length);
}
return 0;
}
static const char *attr_string(Dwarf_Die *die, uint32_t name)
{
Dwarf_Attribute attr;
if (dwarf_attr(die, name, &attr) != NULL)
return dwarf_formstring(&attr);
return NULL;
}
static struct dwarf_off_ref attr_type(Dwarf_Die *die, uint32_t attr_name)
{
Dwarf_Attribute attr;
struct dwarf_off_ref ref;
if (dwarf_attr(die, attr_name, &attr) != NULL) {
Dwarf_Die type_die;
if (dwarf_formref_die(&attr, &type_die) != NULL) {
ref.from_types = attr.form == DW_FORM_ref_sig8;
ref.off = dwarf_dieoffset(&type_die);
return ref;
}
}
memset(&ref, 0, sizeof(ref));
return ref;
}
static int attr_location(Dwarf_Die *die, Dwarf_Op **expr, size_t *exprlen)
{
Dwarf_Attribute attr;
if (dwarf_attr(die, DW_AT_location, &attr) != NULL) {
if (dwarf_getlocation(&attr, expr, exprlen) == 0)
return 0;
}
return 1;
}
static void *__tag__alloc(struct dwarf_cu *dcu, size_t size, bool spec)
{
struct dwarf_tag *dtag = obstack_zalloc(&dcu->obstack,
(sizeof(*dtag) +
(spec ? sizeof(dwarf_off_ref) : 0)));
if (dtag == NULL)
return NULL;
struct tag *tag = obstack_zalloc(&dcu->cu->obstack, size);
if (tag == NULL)
return NULL;
dtag->tag = tag;
tag->priv = dtag;
tag->type = 0;
tag->top_level = 0;
return tag;
}
static void *tag__alloc(struct cu *cu, size_t size)
{
return __tag__alloc(cu->priv, size, false);
}
static void *tag__alloc_with_spec(struct cu *cu, size_t size)
{
return __tag__alloc(cu->priv, size, true);
}
static void tag__init(struct tag *tag, struct cu *cu, Dwarf_Die *die)
{
struct dwarf_tag *dtag = tag->priv;
tag->tag = dwarf_tag(die);
dtag->id = dwarf_dieoffset(die);
if (tag->tag == DW_TAG_imported_module ||
tag->tag == DW_TAG_imported_declaration)
dtag->type = attr_type(die, DW_AT_import);
else
dtag->type = attr_type(die, DW_AT_type);
dtag->abstract_origin = attr_type(die, DW_AT_abstract_origin);
tag->recursivity_level = 0;
if (cu->extra_dbg_info) {
int32_t decl_line;
const char *decl_file = dwarf_decl_file(die);
static const char *last_decl_file;
static uint32_t last_decl_file_idx;
if (decl_file != last_decl_file) {
last_decl_file_idx = strings__add(strings, decl_file);
last_decl_file = decl_file;
}
dtag->decl_file = last_decl_file_idx;
dwarf_decl_line(die, &decl_line);
dtag->decl_line = decl_line;
}
INIT_LIST_HEAD(&tag->node);
}
static struct tag *tag__new(Dwarf_Die *die, struct cu *cu)
{
struct tag *tag = tag__alloc(cu, sizeof(*tag));
if (tag != NULL)
tag__init(tag, cu, die);
return tag;
}
static struct ptr_to_member_type *ptr_to_member_type__new(Dwarf_Die *die,
struct cu *cu)
{
struct ptr_to_member_type *ptr = tag__alloc(cu, sizeof(*ptr));
if (ptr != NULL) {
tag__init(&ptr->tag, cu, die);
struct dwarf_tag *dtag = ptr->tag.priv;
dtag->containing_type = attr_type(die, DW_AT_containing_type);
}
return ptr;
}
static struct base_type *base_type__new(Dwarf_Die *die, struct cu *cu)
{
struct base_type *bt = tag__alloc(cu, sizeof(*bt));
if (bt != NULL) {
tag__init(&bt->tag, cu, die);
bt->name = strings__add(strings, attr_string(die, DW_AT_name));
bt->bit_size = attr_numeric(die, DW_AT_byte_size) * 8;
uint64_t encoding = attr_numeric(die, DW_AT_encoding);
bt->is_bool = encoding == DW_ATE_boolean;
bt->is_signed = encoding == DW_ATE_signed;
bt->is_varargs = false;
bt->name_has_encoding = true;
}
return bt;
}
static struct array_type *array_type__new(Dwarf_Die *die, struct cu *cu)
{
struct array_type *at = tag__alloc(cu, sizeof(*at));
if (at != NULL) {
tag__init(&at->tag, cu, die);
at->dimensions = 0;
at->nr_entries = NULL;
at->is_vector = dwarf_hasattr(die, DW_AT_GNU_vector);
}
return at;
}
static void namespace__init(struct namespace *namespace, Dwarf_Die *die,
struct cu *cu)
{
tag__init(&namespace->tag, cu, die);
INIT_LIST_HEAD(&namespace->tags);
namespace->sname = 0;
namespace->name = strings__add(strings, attr_string(die, DW_AT_name));
namespace->nr_tags = 0;
namespace->shared_tags = 0;
}
static struct namespace *namespace__new(Dwarf_Die *die, struct cu *cu)
{
struct namespace *namespace = tag__alloc(cu, sizeof(*namespace));
if (namespace != NULL)
namespace__init(namespace, die, cu);
return namespace;
}
static void type__init(struct type *type, Dwarf_Die *die, struct cu *cu)
{
namespace__init(&type->namespace, die, cu);
INIT_LIST_HEAD(&type->node);
type->size = attr_numeric(die, DW_AT_byte_size);
type->alignment = attr_numeric(die, DW_AT_alignment);
type->declaration = attr_numeric(die, DW_AT_declaration);
dwarf_tag__set_spec(type->namespace.tag.priv,
attr_type(die, DW_AT_specification));
type->definition_emitted = 0;
type->fwd_decl_emitted = 0;
type->resized = 0;
type->nr_members = 0;
type->nr_static_members = 0;
}
static struct type *type__new(Dwarf_Die *die, struct cu *cu)
{
struct type *type = tag__alloc_with_spec(cu, sizeof(*type));
if (type != NULL)
type__init(type, die, cu);
return type;
}
static struct enumerator *enumerator__new(Dwarf_Die *die, struct cu *cu)
{
struct enumerator *enumerator = tag__alloc(cu, sizeof(*enumerator));
if (enumerator != NULL) {
tag__init(&enumerator->tag, cu, die);
enumerator->name = strings__add(strings, attr_string(die, DW_AT_name));
enumerator->value = attr_numeric(die, DW_AT_const_value);
}
return enumerator;
}
static enum vscope dwarf__location(Dwarf_Die *die, uint64_t *addr, struct location *location)
{
enum vscope scope = VSCOPE_UNKNOWN;
if (attr_location(die, &location->expr, &location->exprlen) != 0)
scope = VSCOPE_OPTIMIZED;
else if (location->exprlen != 0) {
Dwarf_Op *expr = location->expr;
switch (expr->atom) {
case DW_OP_addr:
scope = VSCOPE_GLOBAL;
*addr = expr[0].number;
break;
case DW_OP_reg1 ... DW_OP_reg31:
case DW_OP_breg0 ... DW_OP_breg31:
scope = VSCOPE_REGISTER; break;
case DW_OP_fbreg:
scope = VSCOPE_LOCAL; break;
}
}
return scope;
}
enum vscope variable__scope(const struct variable *var)
{
return var->scope;
}
const char *variable__scope_str(const struct variable *var)
{
switch (var->scope) {
case VSCOPE_LOCAL: return "local";
case VSCOPE_GLOBAL: return "global";
case VSCOPE_REGISTER: return "register";
case VSCOPE_OPTIMIZED: return "optimized";
default: break;
};
return "unknown";
}
static struct variable *variable__new(Dwarf_Die *die, struct cu *cu)
{
struct variable *var = tag__alloc(cu, sizeof(*var));
if (var != NULL) {
tag__init(&var->ip.tag, cu, die);
var->name = strings__add(strings, attr_string(die, DW_AT_name));
/* variable is visible outside of its enclosing cu */
var->external = dwarf_hasattr(die, DW_AT_external);
/* non-defining declaration of an object */
var->declaration = dwarf_hasattr(die, DW_AT_declaration);
var->scope = VSCOPE_UNKNOWN;
var->ip.addr = 0;
if (!var->declaration && cu->has_addr_info)
var->scope = dwarf__location(die, &var->ip.addr, &var->location);
}
return var;
}
static int tag__recode_dwarf_bitfield(struct tag *tag, struct cu *cu, uint16_t bit_size)
{
int id;
type_id_t short_id;
struct tag *recoded;
/* in all the cases the name is at the same offset */
strings_t name = tag__namespace(tag)->name;
switch (tag->tag) {
case DW_TAG_typedef: {
const struct dwarf_tag *dtag = tag->priv;
struct dwarf_tag *dtype = dwarf_cu__find_type_by_ref(cu->priv,
&dtag->type);
struct tag *type = dtype->tag;
id = tag__recode_dwarf_bitfield(type, cu, bit_size);
if (id < 0)
return id;
struct type *new_typedef = obstack_zalloc(&cu->obstack,
sizeof(*new_typedef));
if (new_typedef == NULL)
return -ENOMEM;
recoded = (struct tag *)new_typedef;
recoded->tag = DW_TAG_typedef;
recoded->type = id;
new_typedef->namespace.name = tag__namespace(tag)->name;
}
break;
case DW_TAG_const_type:
case DW_TAG_volatile_type: {
const struct dwarf_tag *dtag = tag->priv;
struct dwarf_tag *dtype = dwarf_cu__find_type_by_ref(cu->priv, &dtag->type);
struct tag *type = dtype->tag;
id = tag__recode_dwarf_bitfield(type, cu, bit_size);
if (id == tag->type)
return id;
recoded = obstack_zalloc(&cu->obstack, sizeof(*recoded));
if (recoded == NULL)
return -ENOMEM;
recoded->tag = DW_TAG_volatile_type;
recoded->type = id;
}
break;
case DW_TAG_base_type:
/*
* Here we must search on the final, core cu, not on
* the dwarf_cu as in dwarf there are no such things
* as base_types of less than 8 bits, etc.
*/
recoded = cu__find_base_type_by_sname_and_size(cu, name, bit_size, &short_id);
if (recoded != NULL)
return short_id;
struct base_type *new_bt = obstack_zalloc(&cu->obstack,
sizeof(*new_bt));
if (new_bt == NULL)
return -ENOMEM;
recoded = (struct tag *)new_bt;
recoded->tag = DW_TAG_base_type;
recoded->top_level = 1;
new_bt->name = name;
new_bt->bit_size = bit_size;
break;
case DW_TAG_enumeration_type:
/*
* Here we must search on the final, core cu, not on
* the dwarf_cu as in dwarf there are no such things
* as enumeration_types of less than 8 bits, etc.
*/
recoded = cu__find_enumeration_by_sname_and_size(cu, name, bit_size, &short_id);
if (recoded != NULL)
return short_id;
struct type *alias = tag__type(tag);
struct type *new_enum = obstack_zalloc(&cu->obstack, sizeof(*new_enum));
if (new_enum == NULL)
return -ENOMEM;
recoded = (struct tag *)new_enum;
recoded->tag = DW_TAG_enumeration_type;
recoded->top_level = 1;
new_enum->nr_members = alias->nr_members;
/*
* Share the tags
*/
new_enum->namespace.tags.next = &alias->namespace.tags;
new_enum->namespace.shared_tags = 1;
new_enum->namespace.name = name;
new_enum->size = bit_size;
break;
default:
fprintf(stderr, "%s: tag=%s, name=%s, bit_size=%d\n",
__func__, dwarf_tag_name(tag->tag),
strings__ptr(strings, name), bit_size);
return -EINVAL;
}
uint32_t new_id;
if (cu__add_tag(cu, recoded, &new_id) == 0)
return new_id;
obstack_free(&cu->obstack, recoded);
return -ENOMEM;
}
int class_member__dwarf_recode_bitfield(struct class_member *member,
struct cu *cu)
{
struct dwarf_tag *dtag = member->tag.priv;
struct dwarf_tag *type = dwarf_cu__find_type_by_ref(cu->priv, &dtag->type);
int recoded_type_id;
if (type == NULL)
return -ENOENT;
recoded_type_id = tag__recode_dwarf_bitfield(type->tag, cu, member->bitfield_size);
if (recoded_type_id < 0)
return recoded_type_id;
member->tag.type = recoded_type_id;
return 0;
}
static struct class_member *class_member__new(Dwarf_Die *die, struct cu *cu,
bool in_union)
{
struct class_member *member = tag__alloc(cu, sizeof(*member));
if (member != NULL) {
tag__init(&member->tag, cu, die);
member->name = strings__add(strings, attr_string(die, DW_AT_name));
member->is_static = !in_union && !dwarf_hasattr(die, DW_AT_data_member_location);
member->const_value = attr_numeric(die, DW_AT_const_value);
member->alignment = attr_numeric(die, DW_AT_alignment);
member->byte_offset = attr_offset(die, DW_AT_data_member_location);
/*
* Bit offset calculated here is valid only for byte-aligned
* fields. For bitfields on little-endian archs we need to
* adjust them taking into account byte size of the field,
* which might not be yet known. So we'll re-calculate bit
* offset later, in class_member__cache_byte_size.
*/
member->bit_offset = member->byte_offset * 8;
/*
* If DW_AT_byte_size is not present, byte size will be
* determined later in class_member__cache_byte_size using
* base integer/enum type
*/
member->byte_size = attr_numeric(die, DW_AT_byte_size);
member->bitfield_offset = attr_numeric(die, DW_AT_bit_offset);
member->bitfield_size = attr_numeric(die, DW_AT_bit_size);
member->bit_hole = 0;
member->bitfield_end = 0;
member->visited = 0;
member->accessibility = attr_numeric(die, DW_AT_accessibility);
member->virtuality = attr_numeric(die, DW_AT_virtuality);
member->hole = 0;
}
return member;
}
static struct parameter *parameter__new(Dwarf_Die *die, struct cu *cu)
{
struct parameter *parm = tag__alloc(cu, sizeof(*parm));
if (parm != NULL) {
tag__init(&parm->tag, cu, die);
parm->name = strings__add(strings, attr_string(die, DW_AT_name));
}
return parm;
}
static struct inline_expansion *inline_expansion__new(Dwarf_Die *die,
struct cu *cu)
{
struct inline_expansion *exp = tag__alloc(cu, sizeof(*exp));
if (exp != NULL) {
struct dwarf_tag *dtag = exp->ip.tag.priv;
tag__init(&exp->ip.tag, cu, die);
dtag->decl_file =
strings__add(strings, attr_string(die, DW_AT_call_file));
dtag->decl_line = attr_numeric(die, DW_AT_call_line);
dtag->type = attr_type(die, DW_AT_abstract_origin);
exp->ip.addr = 0;
exp->high_pc = 0;
if (!cu->has_addr_info)
goto out;
if (dwarf_lowpc(die, &exp->ip.addr))
exp->ip.addr = 0;
if (dwarf_lowpc(die, &exp->high_pc))
exp->high_pc = 0;
exp->size = exp->high_pc - exp->ip.addr;
if (exp->size == 0) {
Dwarf_Addr base, start;
ptrdiff_t offset = 0;
while (1) {
offset = dwarf_ranges(die, offset, &base, &start,
&exp->high_pc);
start = (unsigned long)start;
exp->high_pc = (unsigned long)exp->high_pc;
if (offset <= 0)
break;
exp->size += exp->high_pc - start;
if (exp->ip.addr == 0)
exp->ip.addr = start;
}
}
}
out:
return exp;
}
static struct label *label__new(Dwarf_Die *die, struct cu *cu)
{
struct label *label = tag__alloc(cu, sizeof(*label));
if (label != NULL) {
tag__init(&label->ip.tag, cu, die);
label->name = strings__add(strings, attr_string(die, DW_AT_name));
if (!cu->has_addr_info || dwarf_lowpc(die, &label->ip.addr))
label->ip.addr = 0;
}
return label;
}
static struct class *class__new(Dwarf_Die *die, struct cu *cu)
{
struct class *class = tag__alloc_with_spec(cu, sizeof(*class));
if (class != NULL) {
type__init(&class->type, die, cu);
INIT_LIST_HEAD(&class->vtable);
class->nr_vtable_entries =
class->nr_holes =
class->nr_bit_holes =
class->padding =
class->bit_padding = 0;
class->priv = NULL;
}
return class;
}
static void lexblock__init(struct lexblock *block, struct cu *cu,
Dwarf_Die *die)
{
Dwarf_Off high_pc;
if (!cu->has_addr_info || dwarf_lowpc(die, &block->ip.addr)) {
block->ip.addr = 0;
block->size = 0;
} else if (dwarf_highpc(die, &high_pc))
block->size = 0;
else
block->size = high_pc - block->ip.addr;
INIT_LIST_HEAD(&block->tags);
block->size_inline_expansions =
block->nr_inline_expansions =
block->nr_labels =
block->nr_lexblocks =
block->nr_variables = 0;
}
static struct lexblock *lexblock__new(Dwarf_Die *die, struct cu *cu)
{
struct lexblock *block = tag__alloc(cu, sizeof(*block));
if (block != NULL) {
tag__init(&block->ip.tag, cu, die);
lexblock__init(block, cu, die);
}
return block;
}
static void ftype__init(struct ftype *ftype, Dwarf_Die *die, struct cu *cu)
{
const uint16_t tag = dwarf_tag(die);
assert(tag == DW_TAG_subprogram || tag == DW_TAG_subroutine_type);
tag__init(&ftype->tag, cu, die);
INIT_LIST_HEAD(&ftype->parms);
ftype->nr_parms = 0;
ftype->unspec_parms = 0;
}
static struct ftype *ftype__new(Dwarf_Die *die, struct cu *cu)
{
struct ftype *ftype = tag__alloc(cu, sizeof(*ftype));
if (ftype != NULL)
ftype__init(ftype, die, cu);
return ftype;
}
static struct function *function__new(Dwarf_Die *die, struct cu *cu)
{
struct function *func = tag__alloc_with_spec(cu, sizeof(*func));
if (func != NULL) {
ftype__init(&func->proto, die, cu);
lexblock__init(&func->lexblock, cu, die);
func->name = strings__add(strings, attr_string(die, DW_AT_name));
func->linkage_name = strings__add(strings, attr_string(die, DW_AT_MIPS_linkage_name));
func->inlined = attr_numeric(die, DW_AT_inline);
func->declaration = dwarf_hasattr(die, DW_AT_declaration);
func->external = dwarf_hasattr(die, DW_AT_external);
func->abstract_origin = dwarf_hasattr(die, DW_AT_abstract_origin);
dwarf_tag__set_spec(func->proto.tag.priv,
attr_type(die, DW_AT_specification));
func->accessibility = attr_numeric(die, DW_AT_accessibility);
func->virtuality = attr_numeric(die, DW_AT_virtuality);
INIT_LIST_HEAD(&func->vtable_node);
INIT_LIST_HEAD(&func->tool_node);
func->vtable_entry = -1;
if (dwarf_hasattr(die, DW_AT_vtable_elem_location))
func->vtable_entry = attr_offset(die, DW_AT_vtable_elem_location);
func->cu_total_size_inline_expansions = 0;
func->cu_total_nr_inline_expansions = 0;
func->priv = NULL;
}
return func;
}
static uint64_t attr_upper_bound(Dwarf_Die *die)
{
Dwarf_Attribute attr;
if (dwarf_attr(die, DW_AT_upper_bound, &attr) != NULL) {
Dwarf_Word num;
if (dwarf_formudata(&attr, &num) == 0) {
return (uintmax_t)num + 1;
}
} else if (dwarf_attr(die, DW_AT_count, &attr) != NULL) {
Dwarf_Word num;
if (dwarf_formudata(&attr, &num) == 0) {
return (uintmax_t)num;
}
}
return 0;
}
static void __cu__tag_not_handled(Dwarf_Die *die, const char *fn)
{
uint32_t tag = dwarf_tag(die);
fprintf(stderr, "%s: DW_TAG_%s (%#x) @ <%#llx> not handled!\n",
fn, dwarf_tag_name(tag), tag,
(unsigned long long)dwarf_dieoffset(die));
}
static struct tag unsupported_tag;
#define cu__tag_not_handled(die) __cu__tag_not_handled(die, __FUNCTION__)
static struct tag *__die__process_tag(Dwarf_Die *die, struct cu *cu,
int toplevel, const char *fn);
#define die__process_tag(die, cu, toplevel) \
__die__process_tag(die, cu, toplevel, __FUNCTION__)
static struct tag *die__create_new_tag(Dwarf_Die *die, struct cu *cu)
{
struct tag *tag = tag__new(die, cu);
if (tag != NULL) {
if (dwarf_haschildren(die))
fprintf(stderr, "%s: %s WITH children!\n", __func__,
dwarf_tag_name(tag->tag));
}
return tag;
}
static struct tag *die__create_new_ptr_to_member_type(Dwarf_Die *die,
struct cu *cu)
{
struct ptr_to_member_type *ptr = ptr_to_member_type__new(die, cu);
return ptr ? &ptr->tag : NULL;
}
static int die__process_class(Dwarf_Die *die,
struct type *class, struct cu *cu);
static struct tag *die__create_new_class(Dwarf_Die *die, struct cu *cu)
{
Dwarf_Die child;
struct class *class = class__new(die, cu);
if (class != NULL &&
dwarf_haschildren(die) != 0 &&
dwarf_child(die, &child) == 0) {
if (die__process_class(&child, &class->type, cu) != 0) {
class__delete(class, cu);
class = NULL;
}
}
return class ? &class->type.namespace.tag : NULL;
}
static int die__process_namespace(Dwarf_Die *die, struct namespace *namespace,
struct cu *cu);
static struct tag *die__create_new_namespace(Dwarf_Die *die, struct cu *cu)
{
Dwarf_Die child;
struct namespace *namespace = namespace__new(die, cu);
if (namespace != NULL &&
dwarf_haschildren(die) != 0 &&
dwarf_child(die, &child) == 0) {
if (die__process_namespace(&child, namespace, cu) != 0) {
namespace__delete(namespace, cu);
namespace = NULL;
}
}
return namespace ? &namespace->tag : NULL;
}
static struct tag *die__create_new_union(Dwarf_Die *die, struct cu *cu)
{
Dwarf_Die child;
struct type *utype = type__new(die, cu);
if (utype != NULL &&
dwarf_haschildren(die) != 0 &&
dwarf_child(die, &child) == 0) {
if (die__process_class(&child, utype, cu) != 0) {
type__delete(utype, cu);
utype = NULL;
}
}
return utype ? &utype->namespace.tag : NULL;
}
static struct tag *die__create_new_base_type(Dwarf_Die *die, struct cu *cu)
{
struct base_type *base = base_type__new(die, cu);
if (base == NULL)
return NULL;
if (dwarf_haschildren(die))
fprintf(stderr, "%s: DW_TAG_base_type WITH children!\n",
__func__);
return &base->tag;
}
static struct tag *die__create_new_typedef(Dwarf_Die *die, struct cu *cu)
{
struct type *tdef = type__new(die, cu);
if (tdef == NULL)
return NULL;
if (dwarf_haschildren(die)) {
struct dwarf_tag *dtag = tdef->namespace.tag.priv;
fprintf(stderr, "%s: DW_TAG_typedef %llx WITH children!\n",
__func__, (unsigned long long)dtag->id);
}
return &tdef->namespace.tag;
}
static struct tag *die__create_new_array(Dwarf_Die *die, struct cu *cu)
{
Dwarf_Die child;
/* "64 dimensions will be enough for everybody." acme, 2006 */
const uint8_t max_dimensions = 64;
uint32_t nr_entries[max_dimensions];
struct array_type *array = array_type__new(die, cu);
if (array == NULL)
return NULL;
if (!dwarf_haschildren(die) || dwarf_child(die, &child) != 0)
return &array->tag;
die = &child;
do {
if (dwarf_tag(die) == DW_TAG_subrange_type) {
nr_entries[array->dimensions++] = attr_upper_bound(die);
if (array->dimensions == max_dimensions) {
fprintf(stderr, "%s: only %u dimensions are "
"supported!\n",
__FUNCTION__, max_dimensions);
break;
}
} else
cu__tag_not_handled(die);
} while (dwarf_siblingof(die, die) == 0);
array->nr_entries = memdup(nr_entries,
array->dimensions * sizeof(uint32_t), cu);
if (array->nr_entries == NULL)
goto out_free;
return &array->tag;
out_free:
obstack_free(&cu->obstack, array);
return NULL;
}
static struct tag *die__create_new_parameter(Dwarf_Die *die,
struct ftype *ftype,
struct lexblock *lexblock,
struct cu *cu)
{
struct parameter *parm = parameter__new(die, cu);
if (parm == NULL)
return NULL;
if (ftype != NULL)
ftype__add_parameter(ftype, parm);
else {
/*
* DW_TAG_formal_parameters on a non DW_TAG_subprogram nor
* DW_TAG_subroutine_type tag happens sometimes, likely due to
* compiler optimizing away a inline expansion (at least this
* was observed in some cases, such as in the Linux kernel
* current_kernel_time function circa 2.6.20-rc5), keep it in
* the lexblock tag list because it can be referenced as an
* DW_AT_abstract_origin in another DW_TAG_formal_parameter.
*/
lexblock__add_tag(lexblock, &parm->tag);
}
return &parm->tag;
}
static struct tag *die__create_new_label(Dwarf_Die *die,
struct lexblock *lexblock,
struct cu *cu)
{
struct label *label = label__new(die, cu);
if (label == NULL)
return NULL;
lexblock__add_label(lexblock, label);
return &label->ip.tag;
}
static struct tag *die__create_new_variable(Dwarf_Die *die, struct cu *cu)
{
struct variable *var = variable__new(die, cu);
return var ? &var->ip.tag : NULL;
}
static struct tag *die__create_new_subroutine_type(Dwarf_Die *die,
struct cu *cu)
{
Dwarf_Die child;
struct ftype *ftype = ftype__new(die, cu);
struct tag *tag;
if (ftype == NULL)
return NULL;
if (!dwarf_haschildren(die) || dwarf_child(die, &child) != 0)
goto out;
die = &child;
do {
uint32_t id;
switch (dwarf_tag(die)) {
case DW_TAG_formal_parameter:
tag = die__create_new_parameter(die, ftype, NULL, cu);
break;
case DW_TAG_unspecified_parameters:
ftype->unspec_parms = 1;
continue;
default:
tag = die__process_tag(die, cu, 0);
if (tag == NULL)
goto out_delete;
if (cu__add_tag(cu, tag, &id) < 0)
goto out_delete_tag;
goto hash;
}
if (tag == NULL)
goto out_delete;
if (cu__table_add_tag(cu, tag, &id) < 0)
goto out_delete_tag;
hash:
cu__hash(cu, tag);
struct dwarf_tag *dtag = tag->priv;
dtag->small_id = id;
} while (dwarf_siblingof(die, die) == 0);
out:
return &ftype->tag;
out_delete_tag:
tag__delete(tag, cu);
out_delete:
ftype__delete(ftype, cu);
return NULL;
}
static struct tag *die__create_new_enumeration(Dwarf_Die *die, struct cu *cu)
{
Dwarf_Die child;
struct type *enumeration = type__new(die, cu);
if (enumeration == NULL)
return NULL;
if (enumeration->size == 0)
enumeration->size = sizeof(int) * 8;
else
enumeration->size *= 8;
if (!dwarf_haschildren(die) || dwarf_child(die, &child) != 0) {
/* Seen on libQtCore.so.4.3.4.debug,
* class QAbstractFileEngineIterator, enum EntryInfoType */
goto out;
}
die = &child;
do {
struct enumerator *enumerator;
if (dwarf_tag(die) != DW_TAG_enumerator) {
cu__tag_not_handled(die);
continue;
}
enumerator = enumerator__new(die, cu);
if (enumerator == NULL)
goto out_delete;
enumeration__add(enumeration, enumerator);
} while (dwarf_siblingof(die, die) == 0);
out:
return &enumeration->namespace.tag;
out_delete:
enumeration__delete(enumeration, cu);
return NULL;
}
static int die__process_class(Dwarf_Die *die, struct type *class,
struct cu *cu)
{
const bool is_union = tag__is_union(&class->namespace.tag);
do {
switch (dwarf_tag(die)) {
#ifdef STB_GNU_UNIQUE
case DW_TAG_GNU_formal_parameter_pack:
case DW_TAG_GNU_template_parameter_pack:
case DW_TAG_GNU_template_template_param:
#endif
case DW_TAG_template_type_parameter:
case DW_TAG_template_value_parameter:
/*
* FIXME: probably we'll have to attach this as a list of
* template parameters to use at class__fprintf time...
*
* See:
* https://gcc.gnu.org/wiki/TemplateParmsDwarf
*/
tag__print_not_supported(dwarf_tag(die));
continue;
case DW_TAG_inheritance:
case DW_TAG_member: {
struct class_member *member = class_member__new(die, cu, is_union);
if (member == NULL)
return -ENOMEM;
if (cu__is_c_plus_plus(cu)) {
uint32_t id;
if (cu__table_add_tag(cu, &member->tag, &id) < 0) {
class_member__delete(member, cu);
return -ENOMEM;
}
struct dwarf_tag *dtag = member->tag.priv;
dtag->small_id = id;
}
type__add_member(class, member);
cu__hash(cu, &member->tag);
}
continue;
default: {
struct tag *tag = die__process_tag(die, cu, 0);
if (tag == NULL)
return -ENOMEM;
uint32_t id;
if (cu__table_add_tag(cu, tag, &id) < 0) {
tag__delete(tag, cu);
return -ENOMEM;
}
struct dwarf_tag *dtag = tag->priv;
dtag->small_id = id;
namespace__add_tag(&class->namespace, tag);
cu__hash(cu, tag);
if (tag__is_function(tag)) {
struct function *fself = tag__function(tag);
if (fself->vtable_entry != -1)
class__add_vtable_entry(type__class(class), fself);
}
continue;
}
}
} while (dwarf_siblingof(die, die) == 0);
return 0;
}
static int die__process_namespace(Dwarf_Die *die, struct namespace *namespace,
struct cu *cu)
{
struct tag *tag;
do {
tag = die__process_tag(die, cu, 0);
if (tag == NULL)
goto out_enomem;
uint32_t id;
if (cu__table_add_tag(cu, tag, &id) < 0)
goto out_delete_tag;
struct dwarf_tag *dtag = tag->priv;
dtag->small_id = id;
namespace__add_tag(namespace, tag);
cu__hash(cu, tag);
} while (dwarf_siblingof(die, die) == 0);
return 0;
out_delete_tag:
tag__delete(tag, cu);
out_enomem:
return -ENOMEM;
}
static int die__process_function(Dwarf_Die *die, struct ftype *ftype,
struct lexblock *lexblock, struct cu *cu);
static int die__create_new_lexblock(Dwarf_Die *die,
struct cu *cu, struct lexblock *father)
{
struct lexblock *lexblock = lexblock__new(die, cu);
if (lexblock != NULL) {
if (die__process_function(die, NULL, lexblock, cu) != 0)
goto out_delete;
}
if (father != NULL)
lexblock__add_lexblock(father, lexblock);
return 0;
out_delete:
lexblock__delete(lexblock, cu);
return -ENOMEM;
}
static struct tag *die__create_new_inline_expansion(Dwarf_Die *die,
struct lexblock *lexblock,
struct cu *cu);
static int die__process_inline_expansion(Dwarf_Die *die, struct lexblock *lexblock, struct cu *cu)
{
Dwarf_Die child;
struct tag *tag;
if (!dwarf_haschildren(die) || dwarf_child(die, &child) != 0)
return 0;
die = &child;
do {
uint32_t id;
switch (dwarf_tag(die)) {
case DW_TAG_GNU_call_site:
case DW_TAG_GNU_call_site_parameter:
/*
* FIXME: read http://www.dwarfstd.org/ShowIssue.php?issue=100909.2&type=open
* and write proper support.
*
* From a quick read there is not much we can use in
* the existing dwarves tools, so just stop warning the user,
* developers will find these notes if wanting to use in a
* new tool.
*/
continue;
case DW_TAG_lexical_block:
if (die__create_new_lexblock(die, cu, lexblock) != 0)
goto out_enomem;
continue;
case DW_TAG_formal_parameter:
/*
* FIXME:
* So far DW_TAG_inline_routine had just an
* abstract origin, but starting with
* /usr/lib/openoffice.org/basis3.0/program/libdbalx.so
* I realized it really has to be handled as a
* DW_TAG_function... Lets just get the types
* for 1.8, then fix this properly.
*
* cu__tag_not_handled(die);
*/
continue;
case DW_TAG_inlined_subroutine:
tag = die__create_new_inline_expansion(die, lexblock, cu);
break;
case DW_TAG_label:
tag = die__create_new_label(die, lexblock, cu);
break;
default:
tag = die__process_tag(die, cu, 0);
if (tag == NULL)
goto out_enomem;
if (tag == &unsupported_tag)
continue;
if (cu__add_tag(cu, tag, &id) < 0)
goto out_delete_tag;
goto hash;
}
if (tag == NULL)
goto out_enomem;
if (cu__table_add_tag(cu, tag, &id) < 0)
goto out_delete_tag;
hash:
cu__hash(cu, tag);
struct dwarf_tag *dtag = tag->priv;
dtag->small_id = id;
} while (dwarf_siblingof(die, die) == 0);
return 0;
out_delete_tag:
tag__delete(tag, cu);
out_enomem:
return -ENOMEM;
}
static struct tag *die__create_new_inline_expansion(Dwarf_Die *die,
struct lexblock *lexblock,
struct cu *cu)
{
struct inline_expansion *exp = inline_expansion__new(die, cu);
if (exp == NULL)
return NULL;
if (die__process_inline_expansion(die, lexblock, cu) != 0) {
obstack_free(&cu->obstack, exp);
return NULL;
}
if (lexblock != NULL)
lexblock__add_inline_expansion(lexblock, exp);
return &exp->ip.tag;
}
static int die__process_function(Dwarf_Die *die, struct ftype *ftype,
struct lexblock *lexblock, struct cu *cu)
{
Dwarf_Die child;
struct tag *tag;
if (!dwarf_haschildren(die) || dwarf_child(die, &child) != 0)
return 0;
die = &child;
do {
uint32_t id;
switch (dwarf_tag(die)) {
case DW_TAG_GNU_call_site:
case DW_TAG_GNU_call_site_parameter:
/*
* XXX: read http://www.dwarfstd.org/ShowIssue.php?issue=100909.2&type=open
* and write proper support.
*
* From a quick read there is not much we can use in
* the existing dwarves tools, so just stop warning the user,
* developers will find these notes if wanting to use in a
* new tool.
*/
continue;
case DW_TAG_dwarf_procedure:
/*
* Ignore it, just scope expressions, that we have no use for (so far).
*/
continue;
#ifdef STB_GNU_UNIQUE
case DW_TAG_GNU_formal_parameter_pack:
case DW_TAG_GNU_template_parameter_pack:
case DW_TAG_GNU_template_template_param:
#endif
case DW_TAG_template_type_parameter:
case DW_TAG_template_value_parameter:
/* FIXME: probably we'll have to attach this as a list of
* template parameters to use at class__fprintf time...
* See die__process_class */
tag__print_not_supported(dwarf_tag(die));
continue;
case DW_TAG_formal_parameter:
tag = die__create_new_parameter(die, ftype, lexblock, cu);
break;
case DW_TAG_variable:
tag = die__create_new_variable(die, cu);
if (tag == NULL)
goto out_enomem;
lexblock__add_variable(lexblock, tag__variable(tag));
break;
case DW_TAG_unspecified_parameters:
if (ftype != NULL)
ftype->unspec_parms = 1;
continue;
case DW_TAG_label:
tag = die__create_new_label(die, lexblock, cu);
break;
case DW_TAG_inlined_subroutine:
tag = die__create_new_inline_expansion(die, lexblock, cu);
break;
case DW_TAG_lexical_block:
if (die__create_new_lexblock(die, cu, lexblock) != 0)
goto out_enomem;
continue;
default:
tag = die__process_tag(die, cu, 0);
if (tag == NULL)
goto out_enomem;
if (tag == &unsupported_tag)
continue;
if (cu__add_tag(cu, tag, &id) < 0)
goto out_delete_tag;
goto hash;
}
if (tag == NULL)
goto out_enomem;
if (cu__table_add_tag(cu, tag, &id) < 0)
goto out_delete_tag;
hash:
cu__hash(cu, tag);
struct dwarf_tag *dtag = tag->priv;
dtag->small_id = id;
} while (dwarf_siblingof(die, die) == 0);
return 0;
out_delete_tag:
tag__delete(tag, cu);
out_enomem:
return -ENOMEM;
}
static struct tag *die__create_new_function(Dwarf_Die *die, struct cu *cu)
{
struct function *function = function__new(die, cu);
if (function != NULL &&
die__process_function(die, &function->proto,
&function->lexblock, cu) != 0) {
function__delete(function, cu);
function = NULL;
}
return function ? &function->proto.tag : NULL;
}
static struct tag *__die__process_tag(Dwarf_Die *die, struct cu *cu,
int top_level, const char *fn)
{
struct tag *tag;
switch (dwarf_tag(die)) {
case DW_TAG_array_type:
tag = die__create_new_array(die, cu); break;
case DW_TAG_base_type:
tag = die__create_new_base_type(die, cu); break;
case DW_TAG_const_type:
case DW_TAG_imported_declaration:
case DW_TAG_imported_module:
case DW_TAG_pointer_type:
case DW_TAG_reference_type:
case DW_TAG_restrict_type:
case DW_TAG_unspecified_type:
case DW_TAG_volatile_type:
tag = die__create_new_tag(die, cu); break;
case DW_TAG_ptr_to_member_type:
tag = die__create_new_ptr_to_member_type(die, cu); break;
case DW_TAG_enumeration_type:
tag = die__create_new_enumeration(die, cu); break;
case DW_TAG_namespace:
tag = die__create_new_namespace(die, cu); break;
case DW_TAG_class_type:
case DW_TAG_interface_type:
case DW_TAG_structure_type:
tag = die__create_new_class(die, cu); break;
case DW_TAG_subprogram:
tag = die__create_new_function(die, cu); break;
case DW_TAG_subroutine_type:
tag = die__create_new_subroutine_type(die, cu); break;
case DW_TAG_rvalue_reference_type:
case DW_TAG_typedef:
tag = die__create_new_typedef(die, cu); break;
case DW_TAG_union_type:
tag = die__create_new_union(die, cu); break;
case DW_TAG_variable:
tag = die__create_new_variable(die, cu); break;
default:
__cu__tag_not_handled(die, fn);
/* fall thru */
case DW_TAG_dwarf_procedure:
/*
* Ignore it, just scope expressions, that we have no use for (so far).
*/
tag = &unsupported_tag;
break;
}
if (tag != NULL)
tag->top_level = top_level;
return tag;
}
static int die__process_unit(Dwarf_Die *die, struct cu *cu)
{
do {
struct tag *tag = die__process_tag(die, cu, 1);
if (tag == NULL)
return -ENOMEM;
if (tag == &unsupported_tag)
continue;
uint32_t id;
cu__add_tag(cu, tag, &id);
cu__hash(cu, tag);
struct dwarf_tag *dtag = tag->priv;
dtag->small_id = id;
} while (dwarf_siblingof(die, die) == 0);
return 0;
}
static void __tag__print_type_not_found(struct tag *tag, const char *func)
{
struct dwarf_tag *dtag = tag->priv;
fprintf(stderr, "%s: couldn't find %#llx type for %#llx (%s)!\n", func,
(unsigned long long)dtag->type.off, (unsigned long long)dtag->id,
dwarf_tag_name(tag->tag));
}
#define tag__print_type_not_found(tag) \
__tag__print_type_not_found(tag, __func__)
static void ftype__recode_dwarf_types(struct tag *tag, struct cu *cu);
static int namespace__recode_dwarf_types(struct tag *tag, struct cu *cu)
{
struct tag *pos;
struct dwarf_cu *dcu = cu->priv;
struct namespace *ns = tag__namespace(tag);
namespace__for_each_tag(ns, pos) {
struct dwarf_tag *dtype;
struct dwarf_tag *dpos = pos->priv;
if (tag__has_namespace(pos)) {
if (namespace__recode_dwarf_types(pos, cu))
return -1;
continue;
}
switch (pos->tag) {
case DW_TAG_member: {
struct class_member *member = tag__class_member(pos);
/*
* We may need to recode the type, possibly creating a
* suitably sized new base_type
*/
if (member->bitfield_size != 0 && !no_bitfield_type_recode) {
if (class_member__dwarf_recode_bitfield(member, cu))
return -1;
continue;
}
}
break;
case DW_TAG_subroutine_type:
case DW_TAG_subprogram:
ftype__recode_dwarf_types(pos, cu);
break;
case DW_TAG_imported_module:
dtype = dwarf_cu__find_tag_by_ref(dcu, &dpos->type);
goto check_type;
/* Can be for both types and non types */
case DW_TAG_imported_declaration:
dtype = dwarf_cu__find_tag_by_ref(dcu, &dpos->type);
if (dtype != NULL)
goto next;
goto find_type;
}
if (dpos->type.off == 0) /* void */
continue;
find_type:
dtype = dwarf_cu__find_type_by_ref(dcu, &dpos->type);
check_type:
if (dtype == NULL) {
tag__print_type_not_found(pos);
continue;
}
next:
pos->type = dtype->small_id;
}
return 0;
}
static void type__recode_dwarf_specification(struct tag *tag, struct cu *cu)
{
struct dwarf_tag *dtype;
struct type *t = tag__type(tag);
dwarf_off_ref specification = dwarf_tag__spec(tag->priv);
if (t->namespace.name != 0 || specification.off == 0)
return;
dtype = dwarf_cu__find_type_by_ref(cu->priv, &specification);
if (dtype != NULL)
t->namespace.name = tag__namespace(dtype->tag)->name;
else {
struct dwarf_tag *dtag = tag->priv;
fprintf(stderr,
"%s: couldn't find name for "
"class %#llx, specification=%#llx\n", __func__,
(unsigned long long)dtag->id,
(unsigned long long)specification.off);
}
}
static void __tag__print_abstract_origin_not_found(struct tag *tag,
const char *func)
{
struct dwarf_tag *dtag = tag->priv;
fprintf(stderr,
"%s: couldn't find %#llx abstract_origin for %#llx (%s)!\n",
func, (unsigned long long)dtag->abstract_origin.off,
(unsigned long long)dtag->id,
dwarf_tag_name(tag->tag));
}
#define tag__print_abstract_origin_not_found(tag ) \
__tag__print_abstract_origin_not_found(tag, __func__)
static void ftype__recode_dwarf_types(struct tag *tag, struct cu *cu)
{
struct parameter *pos;
struct dwarf_cu *dcu = cu->priv;
struct ftype *type = tag__ftype(tag);
ftype__for_each_parameter(type, pos) {
struct dwarf_tag *dpos = pos->tag.priv;
struct dwarf_tag *dtype;
if (dpos->type.off == 0) {
if (dpos->abstract_origin.off == 0) {
/* Function without parameters */
pos->tag.type = 0;
continue;
}
dtype = dwarf_cu__find_tag_by_ref(dcu, &dpos->abstract_origin);
if (dtype == NULL) {
tag__print_abstract_origin_not_found(&pos->tag);
continue;
}
pos->name = tag__parameter(dtype->tag)->name;
pos->tag.type = dtype->tag->type;
continue;
}
dtype = dwarf_cu__find_type_by_ref(dcu, &dpos->type);
if (dtype == NULL) {
tag__print_type_not_found(&pos->tag);
continue;
}
pos->tag.type = dtype->small_id;
}
}
static void lexblock__recode_dwarf_types(struct lexblock *tag, struct cu *cu)
{
struct tag *pos;
struct dwarf_cu *dcu = cu->priv;
list_for_each_entry(pos, &tag->tags, node) {
struct dwarf_tag *dpos = pos->priv;
struct dwarf_tag *dtype;
switch (pos->tag) {
case DW_TAG_lexical_block:
lexblock__recode_dwarf_types(tag__lexblock(pos), cu);
continue;
case DW_TAG_inlined_subroutine:
dtype = dwarf_cu__find_tag_by_ref(dcu, &dpos->type);
if (dtype == NULL) {
tag__print_type_not_found(pos);
continue;
}
ftype__recode_dwarf_types(dtype->tag, cu);
continue;
case DW_TAG_formal_parameter:
if (dpos->type.off != 0)
break;
struct parameter *fp = tag__parameter(pos);
dtype = dwarf_cu__find_tag_by_ref(dcu,
&dpos->abstract_origin);
if (dtype == NULL) {
tag__print_abstract_origin_not_found(pos);
continue;
}
fp->name = tag__parameter(dtype->tag)->name;
pos->type = dtype->tag->type;
continue;
case DW_TAG_variable:
if (dpos->type.off != 0)
break;
struct variable *var = tag__variable(pos);
if (dpos->abstract_origin.off == 0) {
/*
* DW_TAG_variable completely empty was
* found on libQtGui.so.4.3.4.debug
* <3><d6ea1>: Abbrev Number: 164 (DW_TAG_variable)
*/
continue;
}
dtype = dwarf_cu__find_tag_by_ref(dcu,
&dpos->abstract_origin);
if (dtype == NULL) {
tag__print_abstract_origin_not_found(pos);
continue;
}
var->name = tag__variable(dtype->tag)->name;
pos->type = dtype->tag->type;
continue;
case DW_TAG_label: {
struct label *l = tag__label(pos);
if (dpos->abstract_origin.off == 0)
continue;
dtype = dwarf_cu__find_tag_by_ref(dcu, &dpos->abstract_origin);
if (dtype != NULL)
l->name = tag__label(dtype->tag)->name;
else
tag__print_abstract_origin_not_found(pos);
}
continue;
}
dtype = dwarf_cu__find_type_by_ref(dcu, &dpos->type);
if (dtype == NULL) {
tag__print_type_not_found(pos);
continue;
}
pos->type = dtype->small_id;
}
}
static int tag__recode_dwarf_type(struct tag *tag, struct cu *cu)
{
struct dwarf_tag *dtag = tag->priv;
struct dwarf_tag *dtype;
/* Check if this is an already recoded bitfield */
if (dtag == NULL)
return 0;
if (tag__is_type(tag))
type__recode_dwarf_specification(tag, cu);
if (tag__has_namespace(tag))
return namespace__recode_dwarf_types(tag, cu);
switch (tag->tag) {
case DW_TAG_subprogram: {
struct function *fn = tag__function(tag);
if (fn->name == 0) {
dwarf_off_ref specification = dwarf_tag__spec(dtag);
if (dtag->abstract_origin.off == 0 &&
specification.off == 0) {
/*
* Found on libQtGui.so.4.3.4.debug
* <3><1423de>: Abbrev Number: 209 (DW_TAG_subprogram)
* <1423e0> DW_AT_declaration : 1
*/
return 0;
}
dtype = dwarf_cu__find_tag_by_ref(cu->priv, &dtag->abstract_origin);
if (dtype == NULL)
dtype = dwarf_cu__find_tag_by_ref(cu->priv, &specification);
if (dtype != NULL)
fn->name = tag__function(dtype->tag)->name;
else {
fprintf(stderr,
"%s: couldn't find name for "
"function %#llx, abstract_origin=%#llx,"
" specification=%#llx\n", __func__,
(unsigned long long)dtag->id,
(unsigned long long)dtag->abstract_origin.off,
(unsigned long long)specification.off);
}
}
lexblock__recode_dwarf_types(&fn->lexblock, cu);
}
/* Fall thru */
case DW_TAG_subroutine_type:
ftype__recode_dwarf_types(tag, cu);
/* Fall thru, for the function return type */
break;
case DW_TAG_lexical_block:
lexblock__recode_dwarf_types(tag__lexblock(tag), cu);
return 0;
case DW_TAG_ptr_to_member_type: {
struct ptr_to_member_type *pt = tag__ptr_to_member_type(tag);
dtype = dwarf_cu__find_type_by_ref(cu->priv, &dtag->containing_type);
if (dtype != NULL)
pt->containing_type = dtype->small_id;
else {
fprintf(stderr,
"%s: couldn't find type for "
"containing_type %#llx, containing_type=%#llx\n",
__func__,
(unsigned long long)dtag->id,
(unsigned long long)dtag->containing_type.off);
}
}
break;
case DW_TAG_namespace:
return namespace__recode_dwarf_types(tag, cu);
/* Damn, DW_TAG_inlined_subroutine is an special case
as dwarf_tag->id is in fact an abtract origin, i.e. must be
looked up in the tags_table, not in the types_table.
The others also point to routines, so are in tags_table */
case DW_TAG_inlined_subroutine:
case DW_TAG_imported_module:
dtype = dwarf_cu__find_tag_by_ref(cu->priv, &dtag->type);
goto check_type;
/* Can be for both types and non types */
case DW_TAG_imported_declaration:
dtype = dwarf_cu__find_tag_by_ref(cu->priv, &dtag->type);
if (dtype != NULL)
goto out;
goto find_type;
}
if (dtag->type.off == 0) {
tag->type = 0; /* void */
return 0;
}
find_type:
dtype = dwarf_cu__find_type_by_ref(cu->priv, &dtag->type);
check_type:
if (dtype == NULL) {
tag__print_type_not_found(tag);
return 0;
}
out:
tag->type = dtype->small_id;
return 0;
}
static int cu__recode_dwarf_types_table(struct cu *cu,
struct ptr_table *pt,
uint32_t i)
{
for (; i < pt->nr_entries; ++i) {
struct tag *tag = pt->entries[i];
if (tag != NULL) /* void, see cu__new */
if (tag__recode_dwarf_type(tag, cu))
return -1;
}
return 0;
}
static int cu__recode_dwarf_types(struct cu *cu)
{
if (cu__recode_dwarf_types_table(cu, &cu->types_table, 1) ||
cu__recode_dwarf_types_table(cu, &cu->tags_table, 0) ||
cu__recode_dwarf_types_table(cu, &cu->functions_table, 0))
return -1;
return 0;
}
static const char *dwarf_tag__decl_file(const struct tag *tag,
const struct cu *cu)
{
struct dwarf_tag *dtag = tag->priv;
return cu->extra_dbg_info ?
strings__ptr(strings, dtag->decl_file) : NULL;
}
static uint32_t dwarf_tag__decl_line(const struct tag *tag,
const struct cu *cu)
{
struct dwarf_tag *dtag = tag->priv;
return cu->extra_dbg_info ? dtag->decl_line : 0;
}
static unsigned long long dwarf_tag__orig_id(const struct tag *tag,
const struct cu *cu)
{
struct dwarf_tag *dtag = tag->priv;
return cu->extra_dbg_info ? dtag->id : 0;
}
static const char *dwarf__strings_ptr(const struct cu *cu __unused,
strings_t s)
{
return strings__ptr(strings, s);
}
struct debug_fmt_ops dwarf__ops;
static int die__process(Dwarf_Die *die, struct cu *cu)
{
Dwarf_Die child;
const uint16_t tag = dwarf_tag(die);
if (tag != DW_TAG_compile_unit && tag != DW_TAG_type_unit && tag != DW_TAG_partial_unit) {
fprintf(stderr, "%s: DW_TAG_compile_unit, DW_TAG_type_unit or DW_TAG_partial_unit expected got %s!\n",
__FUNCTION__, dwarf_tag_name(tag));
return -EINVAL;
}
cu->language = attr_numeric(die, DW_AT_language);
if (dwarf_child(die, &child) == 0) {
int err = die__process_unit(&child, cu);
if (err)
return err;
}
if (dwarf_siblingof(die, die) == 0)
fprintf(stderr, "%s: got %s unexpected tag after "
"DW_TAG_compile_unit!\n",
__FUNCTION__, dwarf_tag_name(tag));
return 0;
}
static int die__process_and_recode(Dwarf_Die *die, struct cu *cu)
{
int ret = die__process(die, cu);
if (ret != 0)
return ret;
return cu__recode_dwarf_types(cu);
}
static int class_member__cache_byte_size(struct tag *tag, struct cu *cu,
void *cookie)
{
struct class_member *member = tag__class_member(tag);
struct conf_load *conf_load = cookie;
if (tag__is_class_member(tag)) {
if (member->is_static)
return 0;
} else if (tag->tag != DW_TAG_inheritance) {
return 0;
}
if (member->bitfield_size == 0) {
member->byte_size = tag__size(tag, cu);
member->bit_size = member->byte_size * 8;
return 0;
}
/*
* Try to figure out byte size, if it's not directly provided in DWARF
*/
if (member->byte_size == 0) {
struct tag *type = tag__strip_typedefs_and_modifiers(&member->tag, cu);
member->byte_size = tag__size(type, cu);
if (member->byte_size == 0) {
int bit_size;
if (tag__is_enumeration(type)) {
bit_size = tag__type(type)->size;
} else {
struct base_type *bt = tag__base_type(type);
bit_size = bt->bit_size ? bt->bit_size : base_type__name_to_size(bt, cu);
}
member->byte_size = (bit_size + 7) / 8 * 8;
}
}
member->bit_size = member->byte_size * 8;
/*
* XXX: after all the attemps to determine byte size, we might still
* be unsuccessful, because base_type__name_to_size doesn't know about
* the base_type name, so one has to add there when such base_type
* isn't found. pahole will put zero on the struct output so it should
* be easy to spot the name when such unlikely thing happens.
*/
if (member->byte_size == 0) {
member->bitfield_offset = 0;
return 0;
}
/*
* For little-endian architectures, DWARF data emitted by gcc/clang
* specifies bitfield offset as an offset from the highest-order bit
* of an underlying integral type (e.g., int) to a highest-order bit
* of a bitfield. E.g., for bitfield taking first 5 bits of int-backed
* bitfield, bit offset will be 27 (sizeof(int) - 0 offset - 5 bit
* size), which is very counter-intuitive and isn't a natural
* extension of byte offset, which on little-endian points to
* lowest-order byte. So here we re-adjust bitfield offset to be an
* offset from lowest-order bit of underlying integral type to
* a lowest-order bit of a bitfield. This makes bitfield offset
* a natural extension of byte offset for bitfields and is uniform
* with how big-endian bit offsets work.
*/
if (cu->little_endian) {
member->bitfield_offset = member->bit_size - member->bitfield_offset - member->bitfield_size;
}
member->bit_offset = member->byte_offset * 8 + member->bitfield_offset;
/* make sure bitfield offset is non-negative */
if (member->bitfield_offset < 0) {
member->bitfield_offset += member->bit_size;
member->byte_offset -= member->byte_size;
member->bit_offset = member->byte_offset * 8 + member->bitfield_offset;
}
/* align on underlying base type natural alignment boundary */
member->bitfield_offset += (member->byte_offset % member->byte_size) * 8;
member->byte_offset = member->bit_offset / member->bit_size * member->bit_size / 8;
if (member->bitfield_offset >= member->bit_size) {
member->bitfield_offset -= member->bit_size;
member->byte_offset += member->byte_size;
}
if (conf_load && conf_load->fixup_silly_bitfields &&
member->byte_size == 8 * member->bitfield_size) {
member->bitfield_size = 0;
member->bitfield_offset = 0;
}
return 0;
}
static int finalize_cu(struct cus *cus, struct cu *cu, struct dwarf_cu *dcu,
struct conf_load *conf)
{
base_type_name_to_size_table__init(strings);
cu__for_all_tags(cu, class_member__cache_byte_size, conf);
if (conf && conf->steal) {
return conf->steal(cu, conf);
}
return LSK__KEEPIT;
}
static int finalize_cu_immediately(struct cus *cus, struct cu *cu,
struct dwarf_cu *dcu,
struct conf_load *conf)
{
int lsk = finalize_cu(cus, cu, dcu, conf);
switch (lsk) {
case LSK__DELETE:
cu__delete(cu);
break;
case LSK__STOP_LOADING:
break;
case LSK__KEEPIT:
if (!cu->extra_dbg_info)
obstack_free(&dcu->obstack, NULL);
cus__add(cus, cu);
break;
}
return lsk;
}
static int cus__load_debug_types(struct cus *cus, struct conf_load *conf,
Dwfl_Module *mod, Dwarf *dw, Elf *elf,
const char *filename,
const unsigned char *build_id,
int build_id_len,
struct cu **cup, struct dwarf_cu *dcup)
{
Dwarf_Off off = 0, noff, type_off;
size_t cuhl;
uint8_t pointer_size, offset_size;
uint64_t signature;
*cup = NULL;
while (dwarf_next_unit(dw, off, &noff, &cuhl, NULL, NULL, &pointer_size,
&offset_size, &signature, &type_off)
== 0) {
if (*cup == NULL) {
struct cu *cu;
cu = cu__new("", pointer_size, build_id,
build_id_len, filename);
if (cu == NULL) {
return DWARF_CB_ABORT;
}
cu->uses_global_strings = true;
cu->elf = elf;
cu->dwfl = mod;
cu->extra_dbg_info = conf ? conf->extra_dbg_info : 0;
cu->has_addr_info = conf ? conf->get_addr_info : 0;
GElf_Ehdr ehdr;
if (gelf_getehdr(elf, &ehdr) == NULL) {
return DWARF_CB_ABORT;
}
cu->little_endian = ehdr.e_ident[EI_DATA] == ELFDATA2LSB;
dwarf_cu__init(dcup);
dcup->cu = cu;
/* Funny hack. */
dcup->type_unit = dcup;
cu->priv = dcup;
cu->dfops = &dwarf__ops;
*cup = cu;
}
Dwarf_Die die_mem;
Dwarf_Die *cu_die = dwarf_offdie_types(dw, off + cuhl,
&die_mem);
if (die__process(cu_die, *cup) != 0)
return DWARF_CB_ABORT;
off = noff;
}
if (*cup != NULL && cu__recode_dwarf_types(*cup) != 0)
return DWARF_CB_ABORT;
return 0;
}
static int cus__load_module(struct cus *cus, struct conf_load *conf,
Dwfl_Module *mod, Dwarf *dw, Elf *elf,
const char *filename)
{
Dwarf_Off off = 0, noff;
size_t cuhl;
GElf_Addr vaddr;
const unsigned char *build_id = NULL;
uint8_t pointer_size, offset_size;
#ifdef HAVE_DWFL_MODULE_BUILD_ID
int build_id_len = dwfl_module_build_id(mod, &build_id, &vaddr);
#else
int build_id_len = 0;
#endif
struct cu *type_cu;
struct dwarf_cu type_dcu;
int type_lsk = LSK__KEEPIT;
int res = cus__load_debug_types(cus, conf, mod, dw, elf, filename,
build_id, build_id_len,
&type_cu, &type_dcu);
if (res != 0) {
return res;
}
if (type_cu != NULL) {
type_lsk = finalize_cu(cus, type_cu, &type_dcu, conf);
if (type_lsk == LSK__KEEPIT) {
cus__add(cus, type_cu);
}
}
while (dwarf_nextcu(dw, off, &noff, &cuhl, NULL, &pointer_size,
&offset_size) == 0) {
Dwarf_Die die_mem;
Dwarf_Die *cu_die = dwarf_offdie(dw, off + cuhl, &die_mem);
/*
* DW_AT_name in DW_TAG_compile_unit can be NULL, first
* seen in:
* /usr/libexec/gcc/x86_64-redhat-linux/4.3.2/ecj1.debug
*/
const char *name = attr_string(cu_die, DW_AT_name);
struct cu *cu = cu__new(name ?: "", pointer_size,
build_id, build_id_len, filename);
if (cu == NULL)
return DWARF_CB_ABORT;
cu->uses_global_strings = true;
cu->elf = elf;
cu->dwfl = mod;
cu->extra_dbg_info = conf ? conf->extra_dbg_info : 0;
cu->has_addr_info = conf ? conf->get_addr_info : 0;
GElf_Ehdr ehdr;
if (gelf_getehdr(elf, &ehdr) == NULL) {
return DWARF_CB_ABORT;
}
cu->little_endian = ehdr.e_ident[EI_DATA] == ELFDATA2LSB;
struct dwarf_cu dcu;
dwarf_cu__init(&dcu);
dcu.cu = cu;
dcu.type_unit = type_cu ? &type_dcu : NULL;
cu->priv = &dcu;
cu->dfops = &dwarf__ops;
if (die__process_and_recode(cu_die, cu) != 0)
return DWARF_CB_ABORT;
if (finalize_cu_immediately(cus, cu, &dcu, conf)
== LSK__STOP_LOADING)
return DWARF_CB_ABORT;
off = noff;
}
if (type_lsk == LSK__DELETE)
cu__delete(type_cu);
return DWARF_CB_OK;
}
struct process_dwflmod_parms {
struct cus *cus;
struct conf_load *conf;
const char *filename;
uint32_t nr_dwarf_sections_found;
};
static int cus__process_dwflmod(Dwfl_Module *dwflmod,
void **userdata __unused,
const char *name __unused,
Dwarf_Addr base __unused,
void *arg)
{
struct process_dwflmod_parms *parms = arg;
struct cus *cus = parms->cus;
GElf_Addr dwflbias;
/*
* Does the relocation and saves the elf for later processing
* by the stealer, such as pahole_stealer, so that it don't
* have to create another Elf instance just to do things like
* reading this ELF file symtab to do CTF encoding of the
* DW_TAG_suprogram tags (functions).
*/
Elf *elf = dwfl_module_getelf(dwflmod, &dwflbias);
Dwarf_Addr dwbias;
Dwarf *dw = dwfl_module_getdwarf(dwflmod, &dwbias);
int err = DWARF_CB_OK;
if (dw != NULL) {
++parms->nr_dwarf_sections_found;
err = cus__load_module(cus, parms->conf, dwflmod, dw, elf,
parms->filename);
}
/*
* XXX We will fall back to try finding other debugging
* formats (CTF), so no point in telling this to the user
* Use for debugging.
* else
* fprintf(stderr,
* "%s: can't get debug context descriptor: %s\n",
* __func__, dwfl_errmsg(-1));
*/
return err;
}
static int cus__process_file(struct cus *cus, struct conf_load *conf, int fd,
const char *filename)
{
/* Duplicate an fd for dwfl_report_offline to swallow. */
int dwfl_fd = dup(fd);
if (dwfl_fd < 0)
return -1;
/*
* Use libdwfl in a trivial way to open the libdw handle for us.
* This takes care of applying relocations to DWARF data in ET_REL
* files.
*/
static const Dwfl_Callbacks callbacks = {
.section_address = dwfl_offline_section_address,
.find_debuginfo = dwfl_standard_find_debuginfo,
/* We use this table for core files too. */
.find_elf = dwfl_build_id_find_elf,
};
Dwfl *dwfl = dwfl_begin(&callbacks);
if (dwfl_report_offline(dwfl, filename, filename, dwfl_fd) == NULL)
return -1;
dwfl_report_end(dwfl, NULL, NULL);
struct process_dwflmod_parms parms = {
.cus = cus,
.conf = conf,
.filename = filename,
.nr_dwarf_sections_found = 0,
};
/* Process the one or more modules gleaned from this file. */
dwfl_getmodules(dwfl, cus__process_dwflmod, &parms, 0);
dwfl_end(dwfl);
return parms.nr_dwarf_sections_found ? 0 : -1;
}
static int dwarf__load_file(struct cus *cus, struct conf_load *conf,
const char *filename)
{
int fd, err;
elf_version(EV_CURRENT);
fd = open(filename, O_RDONLY);
if (fd == -1)
return -1;
err = cus__process_file(cus, conf, fd, filename);
close(fd);
return err;
}
static int dwarf__init(void)
{
strings = strings__new();
return strings != NULL ? 0 : -ENOMEM;
}
static void dwarf__exit(void)
{
strings__delete(strings);
strings = NULL;
}
struct debug_fmt_ops dwarf__ops = {
.name = "dwarf",
.init = dwarf__init,
.exit = dwarf__exit,
.load_file = dwarf__load_file,
.strings__ptr = dwarf__strings_ptr,
.tag__decl_file = dwarf_tag__decl_file,
.tag__decl_line = dwarf_tag__decl_line,
.tag__orig_id = dwarf_tag__orig_id,
.has_alignment_info = true,
};