+// Read the next name from the set.
+
+const char*
+Dwarf_pubnames_table::next_name(uint8_t* flag_byte)
+{
+ const unsigned char* pinfo = this->pinfo_;
+
+ // Check for end of list. The table should be terminated by an
+ // entry containing nothing but a DIE offset of 0.
+ if (pinfo + this->offset_size_ >= this->end_of_table_)
+ return NULL;
+
+ // Skip the offset within the CU. If this is zero, but we're not
+ // at the end of the table, then we have a real pubnames entry
+ // whose DIE offset is 0 (likely to be a GCC bug). Since we
+ // don't actually use the DIE offset in building .gdb_index,
+ // it's harmless.
+ pinfo += this->offset_size_;
+
+ if (this->is_gnu_style_)
+ *flag_byte = *pinfo++;
+ else
+ *flag_byte = 0;
+
+ // Return a pointer to the string at the current location,
+ // and advance the pointer to the next entry.
+ const char* ret = reinterpret_cast<const char*>(pinfo);
+ while (pinfo < this->buffer_end_ && *pinfo != '\0')
+ ++pinfo;
+ if (pinfo < this->buffer_end_)
+ ++pinfo;
+
+ this->pinfo_ = pinfo;
+ return ret;
+}
+
+// class Dwarf_die
+
+Dwarf_die::Dwarf_die(
+ Dwarf_info_reader* dwinfo,
+ off_t die_offset,
+ Dwarf_die* parent)
+ : dwinfo_(dwinfo), parent_(parent), die_offset_(die_offset),
+ child_offset_(0), sibling_offset_(0), abbrev_code_(NULL), attributes_(),
+ attributes_read_(false), name_(NULL), name_off_(-1), linkage_name_(NULL),
+ linkage_name_off_(-1), string_shndx_(0), specification_(0),
+ abstract_origin_(0)
+{
+ size_t len;
+ const unsigned char* pdie = dwinfo->buffer_at_offset(die_offset);
+ if (pdie == NULL)
+ return;
+ unsigned int code = read_unsigned_LEB_128(pdie, &len);
+ if (code == 0)
+ {
+ if (parent != NULL)
+ parent->set_sibling_offset(die_offset + len);
+ return;
+ }
+ this->attr_offset_ = len;
+
+ // Lookup the abbrev code in the abbrev table.
+ this->abbrev_code_ = dwinfo->get_abbrev(code);
+}
+
+// Read all the attributes of the DIE.
+
+bool
+Dwarf_die::read_attributes()
+{
+ if (this->attributes_read_)
+ return true;
+
+ gold_assert(this->abbrev_code_ != NULL);
+
+ const unsigned char* pdie =
+ this->dwinfo_->buffer_at_offset(this->die_offset_);
+ if (pdie == NULL)
+ return false;
+ const unsigned char* pattr = pdie + this->attr_offset_;
+
+ unsigned int nattr = this->abbrev_code_->attributes.size();
+ this->attributes_.reserve(nattr);
+ for (unsigned int i = 0; i < nattr; ++i)
+ {
+ size_t len;
+ unsigned int attr = this->abbrev_code_->attributes[i].attr;
+ unsigned int form = this->abbrev_code_->attributes[i].form;
+ if (form == elfcpp::DW_FORM_indirect)
+ {
+ form = read_unsigned_LEB_128(pattr, &len);
+ pattr += len;
+ }
+ off_t attr_off = this->die_offset_ + (pattr - pdie);
+ bool ref_form = false;
+ Attribute_value attr_value;
+ attr_value.attr = attr;
+ attr_value.form = form;
+ attr_value.aux.shndx = 0;
+ switch(form)
+ {
+ case elfcpp::DW_FORM_flag_present:
+ attr_value.val.intval = 1;
+ break;
+ case elfcpp::DW_FORM_strp:
+ {
+ off_t str_off;
+ if (this->dwinfo_->offset_size() == 4)
+ str_off = this->dwinfo_->read_from_pointer<32>(&pattr);
+ else
+ str_off = this->dwinfo_->read_from_pointer<64>(&pattr);
+ unsigned int shndx =
+ this->dwinfo_->lookup_reloc(attr_off, &str_off);
+ attr_value.aux.shndx = shndx;
+ attr_value.val.refval = str_off;
+ break;
+ }
+ case elfcpp::DW_FORM_sec_offset:
+ {
+ off_t sec_off;
+ if (this->dwinfo_->offset_size() == 4)
+ sec_off = this->dwinfo_->read_from_pointer<32>(&pattr);
+ else
+ sec_off = this->dwinfo_->read_from_pointer<64>(&pattr);
+ unsigned int shndx =
+ this->dwinfo_->lookup_reloc(attr_off, &sec_off);
+ attr_value.aux.shndx = shndx;
+ attr_value.val.refval = sec_off;
+ ref_form = true;
+ break;
+ }
+ case elfcpp::DW_FORM_addr:
+ {
+ off_t sec_off;
+ if (this->dwinfo_->address_size() == 4)
+ sec_off = this->dwinfo_->read_from_pointer<32>(&pattr);
+ else
+ sec_off = this->dwinfo_->read_from_pointer<64>(&pattr);
+ unsigned int shndx =
+ this->dwinfo_->lookup_reloc(attr_off, &sec_off);
+ attr_value.aux.shndx = shndx;
+ attr_value.val.refval = sec_off;
+ ref_form = true;
+ break;
+ }
+ case elfcpp::DW_FORM_ref_addr:
+ {
+ off_t sec_off;
+ if (this->dwinfo_->ref_addr_size() == 4)
+ sec_off = this->dwinfo_->read_from_pointer<32>(&pattr);
+ else
+ sec_off = this->dwinfo_->read_from_pointer<64>(&pattr);
+ unsigned int shndx =
+ this->dwinfo_->lookup_reloc(attr_off, &sec_off);
+ attr_value.aux.shndx = shndx;
+ attr_value.val.refval = sec_off;
+ ref_form = true;
+ break;
+ }
+ case elfcpp::DW_FORM_block1:
+ attr_value.aux.blocklen = *pattr++;
+ attr_value.val.blockval = pattr;
+ pattr += attr_value.aux.blocklen;
+ break;
+ case elfcpp::DW_FORM_block2:
+ attr_value.aux.blocklen =
+ this->dwinfo_->read_from_pointer<16>(&pattr);
+ attr_value.val.blockval = pattr;
+ pattr += attr_value.aux.blocklen;
+ break;
+ case elfcpp::DW_FORM_block4:
+ attr_value.aux.blocklen =
+ this->dwinfo_->read_from_pointer<32>(&pattr);
+ attr_value.val.blockval = pattr;
+ pattr += attr_value.aux.blocklen;
+ break;
+ case elfcpp::DW_FORM_block:
+ case elfcpp::DW_FORM_exprloc:
+ attr_value.aux.blocklen = read_unsigned_LEB_128(pattr, &len);
+ attr_value.val.blockval = pattr + len;
+ pattr += len + attr_value.aux.blocklen;
+ break;
+ case elfcpp::DW_FORM_data1:
+ case elfcpp::DW_FORM_flag:
+ attr_value.val.intval = *pattr++;
+ break;
+ case elfcpp::DW_FORM_ref1:
+ attr_value.val.refval = *pattr++;
+ ref_form = true;
+ break;
+ case elfcpp::DW_FORM_data2:
+ attr_value.val.intval =
+ this->dwinfo_->read_from_pointer<16>(&pattr);
+ break;
+ case elfcpp::DW_FORM_ref2:
+ attr_value.val.refval =
+ this->dwinfo_->read_from_pointer<16>(&pattr);
+ ref_form = true;
+ break;
+ case elfcpp::DW_FORM_data4:
+ {
+ off_t sec_off;
+ sec_off = this->dwinfo_->read_from_pointer<32>(&pattr);
+ unsigned int shndx =
+ this->dwinfo_->lookup_reloc(attr_off, &sec_off);
+ attr_value.aux.shndx = shndx;
+ attr_value.val.intval = sec_off;
+ break;
+ }
+ case elfcpp::DW_FORM_ref4:
+ {
+ off_t sec_off;
+ sec_off = this->dwinfo_->read_from_pointer<32>(&pattr);
+ unsigned int shndx =
+ this->dwinfo_->lookup_reloc(attr_off, &sec_off);
+ attr_value.aux.shndx = shndx;
+ attr_value.val.refval = sec_off;
+ ref_form = true;
+ break;
+ }
+ case elfcpp::DW_FORM_data8:
+ {
+ off_t sec_off;
+ sec_off = this->dwinfo_->read_from_pointer<64>(&pattr);
+ unsigned int shndx =
+ this->dwinfo_->lookup_reloc(attr_off, &sec_off);
+ attr_value.aux.shndx = shndx;
+ attr_value.val.intval = sec_off;
+ break;
+ }
+ case elfcpp::DW_FORM_ref_sig8:
+ attr_value.val.uintval =
+ this->dwinfo_->read_from_pointer<64>(&pattr);
+ break;
+ case elfcpp::DW_FORM_ref8:
+ {
+ off_t sec_off;
+ sec_off = this->dwinfo_->read_from_pointer<64>(&pattr);
+ unsigned int shndx =
+ this->dwinfo_->lookup_reloc(attr_off, &sec_off);
+ attr_value.aux.shndx = shndx;
+ attr_value.val.refval = sec_off;
+ ref_form = true;
+ break;
+ }
+ case elfcpp::DW_FORM_ref_udata:
+ attr_value.val.refval = read_unsigned_LEB_128(pattr, &len);
+ ref_form = true;
+ pattr += len;
+ break;
+ case elfcpp::DW_FORM_udata:
+ case elfcpp::DW_FORM_GNU_addr_index:
+ case elfcpp::DW_FORM_GNU_str_index:
+ attr_value.val.uintval = read_unsigned_LEB_128(pattr, &len);
+ pattr += len;
+ break;
+ case elfcpp::DW_FORM_sdata:
+ attr_value.val.intval = read_signed_LEB_128(pattr, &len);
+ pattr += len;
+ break;
+ case elfcpp::DW_FORM_string:
+ attr_value.val.stringval = reinterpret_cast<const char*>(pattr);
+ len = strlen(attr_value.val.stringval);
+ pattr += len + 1;
+ break;
+ default:
+ return false;
+ }
+
+ // Cache the most frequently-requested attributes.
+ switch (attr)
+ {
+ case elfcpp::DW_AT_name:
+ if (form == elfcpp::DW_FORM_string)
+ this->name_ = attr_value.val.stringval;
+ else if (form == elfcpp::DW_FORM_strp)
+ {
+ // All indirect strings should refer to the same
+ // string section, so we just save the last one seen.
+ this->string_shndx_ = attr_value.aux.shndx;
+ this->name_off_ = attr_value.val.refval;
+ }
+ break;
+ case elfcpp::DW_AT_linkage_name:
+ case elfcpp::DW_AT_MIPS_linkage_name:
+ if (form == elfcpp::DW_FORM_string)
+ this->linkage_name_ = attr_value.val.stringval;
+ else if (form == elfcpp::DW_FORM_strp)
+ {
+ // All indirect strings should refer to the same
+ // string section, so we just save the last one seen.
+ this->string_shndx_ = attr_value.aux.shndx;
+ this->linkage_name_off_ = attr_value.val.refval;
+ }
+ break;
+ case elfcpp::DW_AT_specification:
+ if (ref_form)
+ this->specification_ = attr_value.val.refval;
+ break;
+ case elfcpp::DW_AT_abstract_origin:
+ if (ref_form)
+ this->abstract_origin_ = attr_value.val.refval;
+ break;
+ case elfcpp::DW_AT_sibling:
+ if (ref_form && attr_value.aux.shndx == 0)
+ this->sibling_offset_ = attr_value.val.refval;
+ default:
+ break;
+ }
+
+ this->attributes_.push_back(attr_value);
+ }
+
+ // Now that we know where the next DIE begins, record the offset
+ // to avoid later recalculation.
+ if (this->has_children())
+ this->child_offset_ = this->die_offset_ + (pattr - pdie);
+ else
+ this->sibling_offset_ = this->die_offset_ + (pattr - pdie);
+
+ this->attributes_read_ = true;
+ return true;
+}
+
+// Skip all the attributes of the DIE and return the offset of the next DIE.
+
+off_t
+Dwarf_die::skip_attributes()
+{
+ gold_assert(this->abbrev_code_ != NULL);
+
+ const unsigned char* pdie =
+ this->dwinfo_->buffer_at_offset(this->die_offset_);
+ if (pdie == NULL)
+ return 0;
+ const unsigned char* pattr = pdie + this->attr_offset_;
+
+ for (unsigned int i = 0; i < this->abbrev_code_->attributes.size(); ++i)
+ {
+ size_t len;
+ unsigned int form = this->abbrev_code_->attributes[i].form;
+ if (form == elfcpp::DW_FORM_indirect)
+ {
+ form = read_unsigned_LEB_128(pattr, &len);
+ pattr += len;
+ }
+ switch(form)
+ {
+ case elfcpp::DW_FORM_flag_present:
+ break;
+ case elfcpp::DW_FORM_strp:
+ case elfcpp::DW_FORM_sec_offset:
+ pattr += this->dwinfo_->offset_size();
+ break;
+ case elfcpp::DW_FORM_addr:
+ pattr += this->dwinfo_->address_size();
+ break;
+ case elfcpp::DW_FORM_ref_addr:
+ pattr += this->dwinfo_->ref_addr_size();
+ break;
+ case elfcpp::DW_FORM_block1:
+ pattr += 1 + *pattr;
+ break;
+ case elfcpp::DW_FORM_block2:
+ {
+ uint16_t block_size;
+ block_size = this->dwinfo_->read_from_pointer<16>(&pattr);
+ pattr += block_size;
+ break;
+ }
+ case elfcpp::DW_FORM_block4:
+ {
+ uint32_t block_size;
+ block_size = this->dwinfo_->read_from_pointer<32>(&pattr);
+ pattr += block_size;
+ break;
+ }
+ case elfcpp::DW_FORM_block:
+ case elfcpp::DW_FORM_exprloc:
+ {
+ uint64_t block_size;
+ block_size = read_unsigned_LEB_128(pattr, &len);
+ pattr += len + block_size;
+ break;
+ }
+ case elfcpp::DW_FORM_data1:
+ case elfcpp::DW_FORM_ref1:
+ case elfcpp::DW_FORM_flag:
+ pattr += 1;
+ break;
+ case elfcpp::DW_FORM_data2:
+ case elfcpp::DW_FORM_ref2:
+ pattr += 2;
+ break;
+ case elfcpp::DW_FORM_data4:
+ case elfcpp::DW_FORM_ref4:
+ pattr += 4;
+ break;
+ case elfcpp::DW_FORM_data8:
+ case elfcpp::DW_FORM_ref8:
+ case elfcpp::DW_FORM_ref_sig8:
+ pattr += 8;
+ break;
+ case elfcpp::DW_FORM_ref_udata:
+ case elfcpp::DW_FORM_udata:
+ case elfcpp::DW_FORM_GNU_addr_index:
+ case elfcpp::DW_FORM_GNU_str_index:
+ read_unsigned_LEB_128(pattr, &len);
+ pattr += len;
+ break;
+ case elfcpp::DW_FORM_sdata:
+ read_signed_LEB_128(pattr, &len);
+ pattr += len;
+ break;
+ case elfcpp::DW_FORM_string:
+ len = strlen(reinterpret_cast<const char*>(pattr));
+ pattr += len + 1;
+ break;
+ default:
+ return 0;
+ }
+ }
+
+ return this->die_offset_ + (pattr - pdie);
+}
+
+// Get the name of the DIE and cache it.
+
+void
+Dwarf_die::set_name()
+{
+ if (this->name_ != NULL || !this->read_attributes())
+ return;
+ if (this->name_off_ != -1)
+ this->name_ = this->dwinfo_->get_string(this->name_off_,
+ this->string_shndx_);
+}
+
+// Get the linkage name of the DIE and cache it.
+
+void
+Dwarf_die::set_linkage_name()
+{
+ if (this->linkage_name_ != NULL || !this->read_attributes())
+ return;
+ if (this->linkage_name_off_ != -1)
+ this->linkage_name_ = this->dwinfo_->get_string(this->linkage_name_off_,
+ this->string_shndx_);
+}
+
+// Return the value of attribute ATTR.
+
+const Dwarf_die::Attribute_value*
+Dwarf_die::attribute(unsigned int attr)
+{
+ if (!this->read_attributes())
+ return NULL;
+ for (unsigned int i = 0; i < this->attributes_.size(); ++i)
+ {
+ if (this->attributes_[i].attr == attr)
+ return &this->attributes_[i];
+ }
+ return NULL;
+}
+
+const char*
+Dwarf_die::string_attribute(unsigned int attr)
+{
+ const Attribute_value* attr_val = this->attribute(attr);
+ if (attr_val == NULL)
+ return NULL;
+ switch (attr_val->form)
+ {
+ case elfcpp::DW_FORM_string:
+ return attr_val->val.stringval;
+ case elfcpp::DW_FORM_strp:
+ return this->dwinfo_->get_string(attr_val->val.refval,
+ attr_val->aux.shndx);
+ default:
+ return NULL;
+ }
+}
+
+int64_t
+Dwarf_die::int_attribute(unsigned int attr)
+{
+ const Attribute_value* attr_val = this->attribute(attr);
+ if (attr_val == NULL)
+ return 0;
+ switch (attr_val->form)
+ {
+ case elfcpp::DW_FORM_flag_present:
+ case elfcpp::DW_FORM_data1:
+ case elfcpp::DW_FORM_flag:
+ case elfcpp::DW_FORM_data2:
+ case elfcpp::DW_FORM_data4:
+ case elfcpp::DW_FORM_data8:
+ case elfcpp::DW_FORM_sdata:
+ return attr_val->val.intval;
+ default:
+ return 0;
+ }
+}
+
+uint64_t
+Dwarf_die::uint_attribute(unsigned int attr)
+{
+ const Attribute_value* attr_val = this->attribute(attr);
+ if (attr_val == NULL)
+ return 0;
+ switch (attr_val->form)
+ {
+ case elfcpp::DW_FORM_flag_present:
+ case elfcpp::DW_FORM_data1:
+ case elfcpp::DW_FORM_flag:
+ case elfcpp::DW_FORM_data4:
+ case elfcpp::DW_FORM_data8:
+ case elfcpp::DW_FORM_ref_sig8:
+ case elfcpp::DW_FORM_udata:
+ return attr_val->val.uintval;
+ default:
+ return 0;
+ }
+}
+
+off_t
+Dwarf_die::ref_attribute(unsigned int attr, unsigned int* shndx)
+{
+ const Attribute_value* attr_val = this->attribute(attr);
+ if (attr_val == NULL)
+ return -1;
+ switch (attr_val->form)
+ {
+ case elfcpp::DW_FORM_sec_offset:
+ case elfcpp::DW_FORM_addr:
+ case elfcpp::DW_FORM_ref_addr:
+ case elfcpp::DW_FORM_ref1:
+ case elfcpp::DW_FORM_ref2:
+ case elfcpp::DW_FORM_ref4:
+ case elfcpp::DW_FORM_ref8:
+ case elfcpp::DW_FORM_ref_udata:
+ *shndx = attr_val->aux.shndx;
+ return attr_val->val.refval;
+ case elfcpp::DW_FORM_ref_sig8:
+ *shndx = attr_val->aux.shndx;
+ return attr_val->val.uintval;
+ case elfcpp::DW_FORM_data4:
+ case elfcpp::DW_FORM_data8:
+ *shndx = attr_val->aux.shndx;
+ return attr_val->val.intval;
+ default:
+ return -1;
+ }
+}
+
+off_t
+Dwarf_die::address_attribute(unsigned int attr, unsigned int* shndx)
+{
+ const Attribute_value* attr_val = this->attribute(attr);
+ if (attr_val == NULL || attr_val->form != elfcpp::DW_FORM_addr)
+ return -1;
+
+ *shndx = attr_val->aux.shndx;
+ return attr_val->val.refval;
+}
+
+// Return the offset of this DIE's first child.
+
+off_t
+Dwarf_die::child_offset()
+{
+ gold_assert(this->abbrev_code_ != NULL);
+ if (!this->has_children())
+ return 0;
+ if (this->child_offset_ == 0)
+ this->child_offset_ = this->skip_attributes();
+ return this->child_offset_;
+}
+
+// Return the offset of this DIE's next sibling.
+
+off_t
+Dwarf_die::sibling_offset()
+{
+ gold_assert(this->abbrev_code_ != NULL);
+
+ if (this->sibling_offset_ != 0)
+ return this->sibling_offset_;
+
+ if (!this->has_children())
+ {
+ this->sibling_offset_ = this->skip_attributes();
+ return this->sibling_offset_;
+ }
+
+ if (this->has_sibling_attribute())
+ {
+ if (!this->read_attributes())
+ return 0;
+ if (this->sibling_offset_ != 0)
+ return this->sibling_offset_;
+ }
+
+ // Skip over the children.
+ off_t child_offset = this->child_offset();
+ while (child_offset > 0)
+ {
+ Dwarf_die die(this->dwinfo_, child_offset, this);
+ // The Dwarf_die ctor will set this DIE's sibling offset
+ // when it reads a zero abbrev code.
+ if (die.tag() == 0)
+ break;
+ child_offset = die.sibling_offset();
+ }
+
+ // This should be set by now. If not, there was a problem reading
+ // the DWARF info, and we return 0.
+ return this->sibling_offset_;
+}
+
+// class Dwarf_info_reader
+
+// Begin parsing the debug info. This calls visit_compilation_unit()
+// or visit_type_unit() for each compilation or type unit found in the
+// section, and visit_die() for each top-level DIE.
+
+void
+Dwarf_info_reader::parse()
+{
+ if (this->object_->is_big_endian())
+ {
+#if defined(HAVE_TARGET_32_BIG) || defined(HAVE_TARGET_64_BIG)
+ this->do_parse<true>();
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#if defined(HAVE_TARGET_32_LITTLE) || defined(HAVE_TARGET_64_LITTLE)
+ this->do_parse<false>();
+#else
+ gold_unreachable();
+#endif
+ }
+}
+
+template<bool big_endian>
+void
+Dwarf_info_reader::do_parse()
+{
+ // Get the section contents and decompress if necessary.
+ section_size_type buffer_size;
+ bool buffer_is_new;
+ this->buffer_ = this->object_->decompressed_section_contents(this->shndx_,
+ &buffer_size,
+ &buffer_is_new);
+ if (this->buffer_ == NULL || buffer_size == 0)
+ return;
+ this->buffer_end_ = this->buffer_ + buffer_size;
+
+ // The offset of this input section in the output section.
+ off_t section_offset = this->object_->output_section_offset(this->shndx_);
+
+ // Start tracking relocations for this section.
+ this->reloc_mapper_ = make_elf_reloc_mapper(this->object_, this->symtab_,
+ this->symtab_size_);
+ this->reloc_mapper_->initialize(this->reloc_shndx_, this->reloc_type_);
+
+ // Loop over compilation units (or type units).
+ unsigned int abbrev_shndx = this->abbrev_shndx_;
+ off_t abbrev_offset = 0;
+ const unsigned char* pinfo = this->buffer_;
+ while (pinfo < this->buffer_end_)
+ {
+ // Read the compilation (or type) unit header.
+ const unsigned char* cu_start = pinfo;
+ this->cu_offset_ = cu_start - this->buffer_;
+ this->cu_length_ = this->buffer_end_ - cu_start;
+
+ // Read unit_length (4 or 12 bytes).
+ if (!this->check_buffer(pinfo + 4))
+ break;
+ uint32_t unit_length =
+ elfcpp::Swap_unaligned<32, big_endian>::readval(pinfo);
+ pinfo += 4;
+ if (unit_length == 0xffffffff)
+ {
+ if (!this->check_buffer(pinfo + 8))
+ break;
+ unit_length = elfcpp::Swap_unaligned<64, big_endian>::readval(pinfo);
+ pinfo += 8;
+ this->offset_size_ = 8;
+ }
+ else
+ this->offset_size_ = 4;
+ if (!this->check_buffer(pinfo + unit_length))
+ break;
+ const unsigned char* cu_end = pinfo + unit_length;
+ this->cu_length_ = cu_end - cu_start;
+ if (!this->check_buffer(pinfo + 2 + this->offset_size_ + 1))
+ break;
+
+ // Read version (2 bytes).
+ this->cu_version_ =
+ elfcpp::Swap_unaligned<16, big_endian>::readval(pinfo);
+ pinfo += 2;
+
+ // Read debug_abbrev_offset (4 or 8 bytes).
+ if (this->offset_size_ == 4)
+ abbrev_offset = elfcpp::Swap_unaligned<32, big_endian>::readval(pinfo);
+ else
+ abbrev_offset = elfcpp::Swap_unaligned<64, big_endian>::readval(pinfo);
+ if (this->reloc_shndx_ > 0)
+ {
+ off_t reloc_offset = pinfo - this->buffer_;
+ off_t value;
+ abbrev_shndx =
+ this->reloc_mapper_->get_reloc_target(reloc_offset, &value);
+ if (abbrev_shndx == 0)
+ return;
+ if (this->reloc_type_ == elfcpp::SHT_REL)
+ abbrev_offset += value;
+ else
+ abbrev_offset = value;
+ }
+ pinfo += this->offset_size_;
+
+ // Read address_size (1 byte).
+ this->address_size_ = *pinfo++;
+
+ // For type units, read the two extra fields.
+ uint64_t signature = 0;
+ off_t type_offset = 0;
+ if (this->is_type_unit_)
+ {
+ if (!this->check_buffer(pinfo + 8 + this->offset_size_))
+ break;
+
+ // Read type_signature (8 bytes).
+ signature = elfcpp::Swap_unaligned<64, big_endian>::readval(pinfo);
+ pinfo += 8;
+
+ // Read type_offset (4 or 8 bytes).
+ if (this->offset_size_ == 4)
+ type_offset =
+ elfcpp::Swap_unaligned<32, big_endian>::readval(pinfo);
+ else
+ type_offset =
+ elfcpp::Swap_unaligned<64, big_endian>::readval(pinfo);
+ pinfo += this->offset_size_;
+ }
+
+ // Read the .debug_abbrev table.
+ this->abbrev_table_.read_abbrevs(this->object_, abbrev_shndx,
+ abbrev_offset);
+
+ // Visit the root DIE.
+ Dwarf_die root_die(this,
+ pinfo - (this->buffer_ + this->cu_offset_),
+ NULL);
+ if (root_die.tag() != 0)
+ {
+ // Visit the CU or TU.
+ if (this->is_type_unit_)
+ this->visit_type_unit(section_offset + this->cu_offset_,
+ cu_end - cu_start, type_offset, signature,
+ &root_die);
+ else
+ this->visit_compilation_unit(section_offset + this->cu_offset_,
+ cu_end - cu_start, &root_die);
+ }
+
+ // Advance to the next CU.
+ pinfo = cu_end;
+ }
+
+ if (buffer_is_new)
+ {
+ delete[] this->buffer_;
+ this->buffer_ = NULL;
+ }
+}
+
+// Read the DWARF string table.
+
+bool
+Dwarf_info_reader::do_read_string_table(unsigned int string_shndx)
+{
+ Relobj* object = this->object_;
+
+ // If we don't have relocations, string_shndx will be 0, and
+ // we'll have to hunt for the .debug_str section.
+ if (string_shndx == 0)
+ {
+ for (unsigned int i = 1; i < this->object_->shnum(); ++i)
+ {
+ std::string name = object->section_name(i);
+ if (name == ".debug_str" || name == ".zdebug_str")
+ {
+ string_shndx = i;
+ this->string_output_section_offset_ =
+ object->output_section_offset(i);
+ break;
+ }
+ }
+ if (string_shndx == 0)
+ return false;
+ }
+
+ if (this->owns_string_buffer_ && this->string_buffer_ != NULL)
+ {
+ delete[] this->string_buffer_;
+ this->owns_string_buffer_ = false;
+ }
+
+ // Get the secton contents and decompress if necessary.
+ section_size_type buffer_size;
+ const unsigned char* buffer =
+ object->decompressed_section_contents(string_shndx,
+ &buffer_size,
+ &this->owns_string_buffer_);
+ this->string_buffer_ = reinterpret_cast<const char*>(buffer);
+ this->string_buffer_end_ = this->string_buffer_ + buffer_size;
+ this->string_shndx_ = string_shndx;
+ return true;
+}
+
+// Read a possibly unaligned integer of SIZE.
+template <int valsize>
+inline typename elfcpp::Valtype_base<valsize>::Valtype
+Dwarf_info_reader::read_from_pointer(const unsigned char* source)
+{
+ typename elfcpp::Valtype_base<valsize>::Valtype return_value;
+ if (this->object_->is_big_endian())
+ return_value = elfcpp::Swap_unaligned<valsize, true>::readval(source);
+ else
+ return_value = elfcpp::Swap_unaligned<valsize, false>::readval(source);
+ return return_value;
+}
+
+// Read a possibly unaligned integer of SIZE. Update SOURCE after read.
+template <int valsize>
+inline typename elfcpp::Valtype_base<valsize>::Valtype
+Dwarf_info_reader::read_from_pointer(const unsigned char** source)
+{
+ typename elfcpp::Valtype_base<valsize>::Valtype return_value;
+ if (this->object_->is_big_endian())
+ return_value = elfcpp::Swap_unaligned<valsize, true>::readval(*source);
+ else
+ return_value = elfcpp::Swap_unaligned<valsize, false>::readval(*source);
+ *source += valsize / 8;
+ return return_value;
+}
+
+// Look for a relocation at offset ATTR_OFF in the dwarf info,
+// and return the section index and offset of the target.
+
+unsigned int
+Dwarf_info_reader::lookup_reloc(off_t attr_off, off_t* target_off)
+{
+ off_t value;
+ attr_off += this->cu_offset_;
+ unsigned int shndx = this->reloc_mapper_->get_reloc_target(attr_off, &value);
+ if (shndx == 0)
+ return 0;
+ if (this->reloc_type_ == elfcpp::SHT_REL)
+ *target_off += value;
+ else
+ *target_off = value;
+ return shndx;
+}
+
+// Return a string from the DWARF string table.
+
+const char*
+Dwarf_info_reader::get_string(off_t str_off, unsigned int string_shndx)
+{
+ if (!this->read_string_table(string_shndx))
+ return NULL;
+
+ // Correct the offset. For incremental update links, we have a
+ // relocated offset that is relative to the output section, but
+ // here we need an offset relative to the input section.
+ str_off -= this->string_output_section_offset_;
+
+ const char* p = this->string_buffer_ + str_off;
+
+ if (p < this->string_buffer_ || p >= this->string_buffer_end_)
+ return NULL;
+
+ return p;
+}
+
+// The following are default, do-nothing, implementations of the
+// hook methods normally provided by a derived class. We provide
+// default implementations rather than no implementation so that
+// a derived class needs to implement only the hooks that it needs
+// to use.
+
+// Process a compilation unit and parse its child DIE.
+
+void
+Dwarf_info_reader::visit_compilation_unit(off_t, off_t, Dwarf_die*)
+{
+}
+
+// Process a type unit and parse its child DIE.
+
+void
+Dwarf_info_reader::visit_type_unit(off_t, off_t, off_t, uint64_t, Dwarf_die*)
+{
+}
+
+// Print a warning about a corrupt debug section.
+
+void
+Dwarf_info_reader::warn_corrupt_debug_section() const
+{
+ gold_warning(_("%s: corrupt debug info in %s"),
+ this->object_->name().c_str(),
+ this->object_->section_name(this->shndx_).c_str());
+}
+
+// class Sized_dwarf_line_info