// dwarf_reader.cc -- parse dwarf2/3 debug information
-// Copyright 2007, 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
+// Copyright (C) 2007-2023 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include "gold.h"
#include <algorithm>
+#include <utility>
#include <vector>
+#include "debug.h"
#include "elfcpp_swap.h"
#include "dwarf.h"
#include "object.h"
-#include "parameters.h"
#include "reloc.h"
#include "dwarf_reader.h"
#include "int_encoding.h"
namespace gold {
+// Class Sized_elf_reloc_mapper
+
+// Initialize the relocation tracker for section RELOC_SHNDX.
+
+template<int size, bool big_endian>
+bool
+Sized_elf_reloc_mapper<size, big_endian>::do_initialize(
+ unsigned int reloc_shndx, unsigned int reloc_type)
+{
+ this->reloc_type_ = reloc_type;
+ return this->track_relocs_.initialize(this->object_, reloc_shndx,
+ reloc_type);
+}
+
+// Looks in the symtab to see what section a symbol is in.
+
+template<int size, bool big_endian>
+unsigned int
+Sized_elf_reloc_mapper<size, big_endian>::symbol_section(
+ unsigned int symndx, Address* value, bool* is_ordinary)
+{
+ const int symsize = elfcpp::Elf_sizes<size>::sym_size;
+ gold_assert(static_cast<off_t>((symndx + 1) * symsize) <= this->symtab_size_);
+ elfcpp::Sym<size, big_endian> elfsym(this->symtab_ + symndx * symsize);
+ *value = elfsym.get_st_value();
+ return this->object_->adjust_sym_shndx(symndx, elfsym.get_st_shndx(),
+ is_ordinary);
+}
+
+// Return the section index and offset within the section of
+// the target of the relocation for RELOC_OFFSET.
+
+template<int size, bool big_endian>
+unsigned int
+Sized_elf_reloc_mapper<size, big_endian>::do_get_reloc_target(
+ off_t reloc_offset, off_t* target_offset)
+{
+ this->track_relocs_.advance(reloc_offset);
+ if (reloc_offset != this->track_relocs_.next_offset())
+ return 0;
+ unsigned int symndx = this->track_relocs_.next_symndx();
+ typename elfcpp::Elf_types<size>::Elf_Addr value;
+ bool is_ordinary;
+ unsigned int target_shndx = this->symbol_section(symndx, &value,
+ &is_ordinary);
+ if (!is_ordinary)
+ return 0;
+ if (this->reloc_type_ == elfcpp::SHT_RELA)
+ value += this->track_relocs_.next_addend();
+ *target_offset = value;
+ return target_shndx;
+}
+
+static inline Elf_reloc_mapper*
+make_elf_reloc_mapper(Relobj* object, const unsigned char* symtab,
+ off_t symtab_size)
+{
+ if (object->elfsize() == 32)
+ {
+ if (object->is_big_endian())
+ {
+#ifdef HAVE_TARGET_32_BIG
+ return new Sized_elf_reloc_mapper<32, true>(object, symtab,
+ symtab_size);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_32_LITTLE
+ return new Sized_elf_reloc_mapper<32, false>(object, symtab,
+ symtab_size);
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else if (object->elfsize() == 64)
+ {
+ if (object->is_big_endian())
+ {
+#ifdef HAVE_TARGET_64_BIG
+ return new Sized_elf_reloc_mapper<64, true>(object, symtab,
+ symtab_size);
+#else
+ gold_unreachable();
+#endif
+ }
+ else
+ {
+#ifdef HAVE_TARGET_64_LITTLE
+ return new Sized_elf_reloc_mapper<64, false>(object, symtab,
+ symtab_size);
+#else
+ gold_unreachable();
+#endif
+ }
+ }
+ else
+ gold_unreachable();
+}
+
+// class Dwarf_abbrev_table
+
+void
+Dwarf_abbrev_table::clear_abbrev_codes()
+{
+ for (unsigned int code = 0; code < this->low_abbrev_code_max_; ++code)
+ {
+ if (this->low_abbrev_codes_[code] != NULL)
+ {
+ delete this->low_abbrev_codes_[code];
+ this->low_abbrev_codes_[code] = NULL;
+ }
+ }
+ for (Abbrev_code_table::iterator it = this->high_abbrev_codes_.begin();
+ it != this->high_abbrev_codes_.end();
+ ++it)
+ {
+ if (it->second != NULL)
+ delete it->second;
+ }
+ this->high_abbrev_codes_.clear();
+}
+
+// Read the abbrev table from an object file.
+
+bool
+Dwarf_abbrev_table::do_read_abbrevs(
+ Relobj* object,
+ unsigned int abbrev_shndx,
+ off_t abbrev_offset)
+{
+ this->clear_abbrev_codes();
+
+ // If we don't have relocations, abbrev_shndx will be 0, and
+ // we'll have to hunt for the .debug_abbrev section.
+ if (abbrev_shndx == 0 && this->abbrev_shndx_ > 0)
+ abbrev_shndx = this->abbrev_shndx_;
+ else if (abbrev_shndx == 0)
+ {
+ for (unsigned int i = 1; i < object->shnum(); ++i)
+ {
+ std::string name = object->section_name(i);
+ if (name == ".debug_abbrev" || name == ".zdebug_abbrev")
+ {
+ abbrev_shndx = i;
+ // 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.
+ abbrev_offset -= object->output_section_offset(i);
+ break;
+ }
+ }
+ if (abbrev_shndx == 0)
+ return false;
+ }
+
+ // Get the section contents and decompress if necessary.
+ if (abbrev_shndx != this->abbrev_shndx_)
+ {
+ if (this->owns_buffer_ && this->buffer_ != NULL)
+ {
+ delete[] this->buffer_;
+ this->owns_buffer_ = false;
+ }
+
+ section_size_type buffer_size;
+ this->buffer_ =
+ object->decompressed_section_contents(abbrev_shndx,
+ &buffer_size,
+ &this->owns_buffer_);
+ this->buffer_end_ = this->buffer_ + buffer_size;
+ this->abbrev_shndx_ = abbrev_shndx;
+ }
+
+ this->buffer_pos_ = this->buffer_ + abbrev_offset;
+ return true;
+}
+
+// Lookup the abbrev code entry for CODE. This function is called
+// only when the abbrev code is not in the direct lookup table.
+// It may be in the hash table, it may not have been read yet,
+// or it may not exist in the abbrev table.
+
+const Dwarf_abbrev_table::Abbrev_code*
+Dwarf_abbrev_table::do_get_abbrev(unsigned int code)
+{
+ // See if the abbrev code is already in the hash table.
+ Abbrev_code_table::const_iterator it = this->high_abbrev_codes_.find(code);
+ if (it != this->high_abbrev_codes_.end())
+ return it->second;
+
+ // Read and store abbrev code definitions until we find the
+ // one we're looking for.
+ for (;;)
+ {
+ // Read the abbrev code. A zero here indicates the end of the
+ // abbrev table.
+ size_t len;
+ if (this->buffer_pos_ >= this->buffer_end_)
+ return NULL;
+ uint64_t nextcode = read_unsigned_LEB_128(this->buffer_pos_, &len);
+ if (nextcode == 0)
+ {
+ this->buffer_pos_ = this->buffer_end_;
+ return NULL;
+ }
+ this->buffer_pos_ += len;
+
+ // Read the tag.
+ if (this->buffer_pos_ >= this->buffer_end_)
+ return NULL;
+ uint64_t tag = read_unsigned_LEB_128(this->buffer_pos_, &len);
+ this->buffer_pos_ += len;
+
+ // Read the has_children flag.
+ if (this->buffer_pos_ >= this->buffer_end_)
+ return NULL;
+ bool has_children = *this->buffer_pos_ == elfcpp::DW_CHILDREN_yes;
+ this->buffer_pos_ += 1;
+
+ // Read the list of (attribute, form) pairs.
+ Abbrev_code* entry = new Abbrev_code(tag, has_children);
+ for (;;)
+ {
+ // Read the attribute.
+ if (this->buffer_pos_ >= this->buffer_end_)
+ return NULL;
+ uint64_t attr = read_unsigned_LEB_128(this->buffer_pos_, &len);
+ this->buffer_pos_ += len;
+
+ // Read the form.
+ if (this->buffer_pos_ >= this->buffer_end_)
+ return NULL;
+ uint64_t form = read_unsigned_LEB_128(this->buffer_pos_, &len);
+ this->buffer_pos_ += len;
+
+ // For DW_FORM_implicit_const, read the constant.
+ int64_t implicit_const = 0;
+ if (form == elfcpp::DW_FORM_implicit_const)
+ {
+ implicit_const = read_signed_LEB_128(this->buffer_pos_, &len);
+ this->buffer_pos_ += len;
+ }
+
+ // A (0,0) pair terminates the list.
+ if (attr == 0 && form == 0)
+ break;
+
+ if (attr == elfcpp::DW_AT_sibling)
+ entry->has_sibling_attribute = true;
+
+ entry->add_attribute(attr, form, implicit_const);
+ }
+
+ this->store_abbrev(nextcode, entry);
+ if (nextcode == code)
+ return entry;
+ }
+
+ return NULL;
+}
+
+// class Dwarf_ranges_table
+
+// Read the ranges table from an object file.
+
+bool
+Dwarf_ranges_table::read_ranges_table(
+ Relobj* object,
+ const unsigned char* symtab,
+ off_t symtab_size,
+ unsigned int ranges_shndx,
+ unsigned int version)
+{
+ const std::string section_name(version < 5
+ ? ".debug_ranges"
+ : ".debug_rnglists");
+ const std::string compressed_section_name(version < 5
+ ? ".zdebug_ranges"
+ : ".zdebug_rnglists");
+
+ // If we've already read this abbrev table, return immediately.
+ if (this->ranges_shndx_ > 0
+ && this->ranges_shndx_ == ranges_shndx)
+ return true;
+
+ // If we don't have relocations, ranges_shndx will be 0, and
+ // we'll have to hunt for the .debug_ranges section.
+ if (ranges_shndx == 0 && this->ranges_shndx_ > 0)
+ ranges_shndx = this->ranges_shndx_;
+ else if (ranges_shndx == 0)
+ {
+ for (unsigned int i = 1; i < object->shnum(); ++i)
+ {
+ std::string name = object->section_name(i);
+ if (name == section_name || name == compressed_section_name)
+ {
+ ranges_shndx = i;
+ this->output_section_offset_ = object->output_section_offset(i);
+ break;
+ }
+ }
+ if (ranges_shndx == 0)
+ return false;
+ }
+
+ // Get the section contents and decompress if necessary.
+ if (ranges_shndx != this->ranges_shndx_)
+ {
+ if (this->owns_ranges_buffer_ && this->ranges_buffer_ != NULL)
+ {
+ delete[] this->ranges_buffer_;
+ this->owns_ranges_buffer_ = false;
+ }
+
+ section_size_type buffer_size;
+ this->ranges_buffer_ =
+ object->decompressed_section_contents(ranges_shndx,
+ &buffer_size,
+ &this->owns_ranges_buffer_);
+ this->ranges_buffer_end_ = this->ranges_buffer_ + buffer_size;
+ this->ranges_shndx_ = ranges_shndx;
+ }
+
+ if (this->ranges_reloc_mapper_ != NULL)
+ {
+ delete this->ranges_reloc_mapper_;
+ this->ranges_reloc_mapper_ = NULL;
+ }
+
+ // For incremental objects, we have no relocations.
+ if (object->is_incremental())
+ return true;
+
+ // Find the relocation section for ".debug_ranges".
+ unsigned int reloc_shndx = 0;
+ unsigned int reloc_type = 0;
+ for (unsigned int i = 0; i < object->shnum(); ++i)
+ {
+ reloc_type = object->section_type(i);
+ if ((reloc_type == elfcpp::SHT_REL
+ || reloc_type == elfcpp::SHT_RELA)
+ && object->section_info(i) == ranges_shndx)
+ {
+ reloc_shndx = i;
+ break;
+ }
+ }
+
+ this->ranges_reloc_mapper_ = make_elf_reloc_mapper(object, symtab,
+ symtab_size);
+ this->ranges_reloc_mapper_->initialize(reloc_shndx, reloc_type);
+ this->reloc_type_ = reloc_type;
+
+ return true;
+}
+
+// Read a range list from section RANGES_SHNDX at offset RANGES_OFFSET.
+
+Dwarf_range_list*
+Dwarf_ranges_table::read_range_list(
+ Relobj* object,
+ const unsigned char* symtab,
+ off_t symtab_size,
+ unsigned int addr_size,
+ unsigned int ranges_shndx,
+ off_t offset)
+{
+ Dwarf_range_list* ranges;
+
+ if (!this->read_ranges_table(object, symtab, symtab_size, ranges_shndx, 4))
+ 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.
+ offset -= this->output_section_offset_;
+
+ // Read the range list at OFFSET.
+ ranges = new Dwarf_range_list();
+ off_t base = 0;
+ for (;
+ this->ranges_buffer_ + offset < this->ranges_buffer_end_;
+ offset += 2 * addr_size)
+ {
+ off_t start;
+ off_t end;
+
+ // Read the raw contents of the section.
+ if (addr_size == 4)
+ {
+ start = this->dwinfo_->read_from_pointer<32>(this->ranges_buffer_
+ + offset);
+ end = this->dwinfo_->read_from_pointer<32>(this->ranges_buffer_
+ + offset + 4);
+ }
+ else
+ {
+ start = this->dwinfo_->read_from_pointer<64>(this->ranges_buffer_
+ + offset);
+ end = this->dwinfo_->read_from_pointer<64>(this->ranges_buffer_
+ + offset + 8);
+ }
+
+ // Check for relocations and adjust the values.
+ unsigned int shndx1 = 0;
+ unsigned int shndx2 = 0;
+ if (this->ranges_reloc_mapper_ != NULL)
+ {
+ shndx1 = this->lookup_reloc(offset, &start);
+ shndx2 = this->lookup_reloc(offset + addr_size, &end);
+ }
+
+ // End of list is marked by a pair of zeroes.
+ if (shndx1 == 0 && start == 0 && end == 0)
+ break;
+
+ // A "base address selection entry" is identified by
+ // 0xffffffff for the first value of the pair. The second
+ // value is used as a base for subsequent range list entries.
+ if (shndx1 == 0 && start == -1)
+ base = end;
+ else if (shndx1 == shndx2)
+ {
+ if (shndx1 == 0 || object->is_section_included(shndx1))
+ ranges->add(shndx1, base + start, base + end);
+ }
+ else
+ gold_warning(_("%s: DWARF info may be corrupt; offsets in a "
+ "range list entry are in different sections"),
+ object->name().c_str());
+ }
+
+ return ranges;
+}
+
+// Read a DWARF 5 range list from section RANGES_SHNDX at offset RANGES_OFFSET.
+
+Dwarf_range_list*
+Dwarf_ranges_table::read_range_list_v5(
+ Relobj* object,
+ const unsigned char* symtab,
+ off_t symtab_size,
+ unsigned int addr_size,
+ unsigned int ranges_shndx,
+ off_t offset)
+{
+ Dwarf_range_list* ranges;
+
+ if (!this->read_ranges_table(object, symtab, symtab_size, ranges_shndx, 5))
+ return NULL;
+
+ ranges = new Dwarf_range_list();
+ off_t base = 0;
+ unsigned int shndx0 = 0;
+
+ // 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.
+ offset -= this->output_section_offset_;
+
+ // Read the range list at OFFSET.
+ const unsigned char* prle = this->ranges_buffer_ + offset;
+ while (prle < this->ranges_buffer_end_)
+ {
+ off_t start;
+ off_t end;
+ unsigned int shndx1 = 0;
+ unsigned int shndx2 = 0;
+ size_t len;
+
+ // Read the entry type.
+ unsigned int rle_type = *prle++;
+ offset += 1;
+
+ if (rle_type == elfcpp::DW_RLE_end_of_list)
+ break;
+
+ switch (rle_type)
+ {
+ case elfcpp::DW_RLE_base_address:
+ if (addr_size == 4)
+ base = this->dwinfo_->read_from_pointer<32>(prle);
+ else
+ base = this->dwinfo_->read_from_pointer<64>(prle);
+ if (this->ranges_reloc_mapper_ != NULL)
+ shndx0 = this->lookup_reloc(offset, &base);
+ prle += addr_size;
+ offset += addr_size;
+ break;
+
+ case elfcpp::DW_RLE_offset_pair:
+ start = read_unsigned_LEB_128(prle, &len);
+ prle += len;
+ offset += len;
+ end = read_unsigned_LEB_128(prle, &len);
+ prle += len;
+ offset += len;
+ if (shndx0 == 0 || object->is_section_included(shndx0))
+ ranges->add(shndx0, base + start, base + end);
+ break;
+
+ case elfcpp::DW_RLE_start_end:
+ if (addr_size == 4)
+ {
+ start = this->dwinfo_->read_from_pointer<32>(prle);
+ end = this->dwinfo_->read_from_pointer<32>(prle + 4);
+ }
+ else
+ {
+ start = this->dwinfo_->read_from_pointer<64>(prle);
+ end = this->dwinfo_->read_from_pointer<64>(prle + 8);
+ }
+ if (this->ranges_reloc_mapper_ != NULL)
+ {
+ shndx1 = this->lookup_reloc(offset, &start);
+ shndx2 = this->lookup_reloc(offset + addr_size, &end);
+ if (shndx1 != shndx2)
+ gold_warning(_("%s: DWARF info may be corrupt; offsets in a "
+ "range list entry are in different sections"),
+ object->name().c_str());
+ }
+ prle += addr_size * 2;
+ offset += addr_size * 2;
+ if (shndx1 == 0 || object->is_section_included(shndx1))
+ ranges->add(shndx1, start, end);
+ break;
+
+ case elfcpp::DW_RLE_start_length:
+ if (addr_size == 4)
+ start = this->dwinfo_->read_from_pointer<32>(prle);
+ else
+ start = this->dwinfo_->read_from_pointer<64>(prle);
+ if (this->ranges_reloc_mapper_ != NULL)
+ shndx1 = this->lookup_reloc(offset, &start);
+ prle += addr_size;
+ offset += addr_size;
+ end = start + read_unsigned_LEB_128(prle, &len);
+ prle += len;
+ offset += len;
+ if (shndx1 == 0 || object->is_section_included(shndx1))
+ ranges->add(shndx1, start, end);
+ break;
+
+ default:
+ gold_warning(_("%s: DWARF range list contains "
+ "unsupported entry type (%d)"),
+ object->name().c_str(), rle_type);
+ break;
+ }
+ }
+
+ return ranges;
+}
+
+// Look for a relocation at offset OFF in the range table,
+// and return the section index and offset of the target.
+
+unsigned int
+Dwarf_ranges_table::lookup_reloc(off_t off, off_t* target_off)
+{
+ off_t value;
+ unsigned int shndx =
+ this->ranges_reloc_mapper_->get_reloc_target(off, &value);
+ if (shndx == 0)
+ return 0;
+ if (this->reloc_type_ == elfcpp::SHT_REL)
+ *target_off += value;
+ else
+ *target_off = value;
+ return shndx;
+}
+
+// class Dwarf_pubnames_table
+
+// Read the pubnames section from the object file.
+
+bool
+Dwarf_pubnames_table::read_section(Relobj* object, const unsigned char* symtab,
+ off_t symtab_size)
+{
+ section_size_type buffer_size;
+ unsigned int shndx = 0;
+ const char* name = this->is_pubtypes_ ? "pubtypes" : "pubnames";
+ const char* gnu_name = (this->is_pubtypes_
+ ? "gnu_pubtypes"
+ : "gnu_pubnames");
+
+ for (unsigned int i = 1; i < object->shnum(); ++i)
+ {
+ std::string section_name = object->section_name(i);
+ const char* section_name_suffix = section_name.c_str();
+ if (is_prefix_of(".debug_", section_name_suffix))
+ section_name_suffix += 7;
+ else if (is_prefix_of(".zdebug_", section_name_suffix))
+ section_name_suffix += 8;
+ else
+ continue;
+ if (strcmp(section_name_suffix, name) == 0)
+ {
+ shndx = i;
+ break;
+ }
+ else if (strcmp(section_name_suffix, gnu_name) == 0)
+ {
+ shndx = i;
+ this->is_gnu_style_ = true;
+ break;
+ }
+ }
+ if (shndx == 0)
+ return false;
+
+ this->buffer_ = object->decompressed_section_contents(shndx,
+ &buffer_size,
+ &this->owns_buffer_);
+ if (this->buffer_ == NULL)
+ return false;
+ this->buffer_end_ = this->buffer_ + buffer_size;
+
+ // For incremental objects, we have no relocations.
+ if (object->is_incremental())
+ return true;
+
+ // Find the relocation section
+ unsigned int reloc_shndx = 0;
+ unsigned int reloc_type = 0;
+ for (unsigned int i = 0; i < object->shnum(); ++i)
+ {
+ reloc_type = object->section_type(i);
+ if ((reloc_type == elfcpp::SHT_REL
+ || reloc_type == elfcpp::SHT_RELA)
+ && object->section_info(i) == shndx)
+ {
+ reloc_shndx = i;
+ break;
+ }
+ }
+
+ this->reloc_mapper_ = make_elf_reloc_mapper(object, symtab, symtab_size);
+ this->reloc_mapper_->initialize(reloc_shndx, reloc_type);
+ this->reloc_type_ = reloc_type;
+
+ return true;
+}
+
+// Read the header for the set at OFFSET.
+
+bool
+Dwarf_pubnames_table::read_header(off_t offset)
+{
+ // Make sure we have actually read the section.
+ gold_assert(this->buffer_ != NULL);
+
+ if (offset < 0 || offset + 14 >= this->buffer_end_ - this->buffer_)
+ return false;
+
+ const unsigned char* pinfo = this->buffer_ + offset;
+
+ // Read the unit_length field.
+ uint64_t unit_length = this->dwinfo_->read_from_pointer<32>(pinfo);
+ pinfo += 4;
+ if (unit_length == 0xffffffff)
+ {
+ unit_length = this->dwinfo_->read_from_pointer<64>(pinfo);
+ this->unit_length_ = unit_length + 12;
+ pinfo += 8;
+ this->offset_size_ = 8;
+ }
+ else
+ {
+ this->unit_length_ = unit_length + 4;
+ this->offset_size_ = 4;
+ }
+ this->end_of_table_ = pinfo + unit_length;
+
+ // If unit_length is too big, maybe we should reject the whole table,
+ // but in cases we know about, it seems OK to assume that the table
+ // is valid through the actual end of the section.
+ if (this->end_of_table_ > this->buffer_end_)
+ this->end_of_table_ = this->buffer_end_;
+
+ // Check the version.
+ unsigned int version = this->dwinfo_->read_from_pointer<16>(pinfo);
+ pinfo += 2;
+ if (version != 2)
+ return false;
+
+ this->reloc_mapper_->get_reloc_target(pinfo - this->buffer_,
+ &this->cu_offset_);
+
+ // Skip the debug_info_offset and debug_info_size fields.
+ pinfo += 2 * this->offset_size_;
+
+ if (pinfo >= this->buffer_end_)
+ return false;
+
+ this->pinfo_ = pinfo;
+ return true;
+}
+
+// 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_implicit_const:
+ attr_value.val.intval =
+ this->abbrev_code_->attributes[i].implicit_const;
+ break;
+ case elfcpp::DW_FORM_strp:
+ case elfcpp::DW_FORM_strp_sup:
+ case elfcpp::DW_FORM_line_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_strx:
+ case elfcpp::DW_FORM_GNU_str_index:
+ attr_value.val.uintval = read_unsigned_LEB_128(pattr, &len);
+ pattr += len;
+ break;
+ case elfcpp::DW_FORM_strx1:
+ attr_value.val.uintval = *pattr++;
+ break;
+ case elfcpp::DW_FORM_strx2:
+ attr_value.val.uintval =
+ this->dwinfo_->read_from_pointer<16>(&pattr);
+ break;
+ case elfcpp::DW_FORM_strx3:
+ attr_value.val.uintval =
+ this->dwinfo_->read_3bytes_from_pointer(&pattr);
+ break;
+ case elfcpp::DW_FORM_strx4:
+ attr_value.val.uintval =
+ this->dwinfo_->read_from_pointer<32>(&pattr);
+ 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;
+ 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:
+ case elfcpp::DW_FORM_ref_sup4:
+ {
+ 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_data16:
+ {
+ // For now, treat this as a 16-byte block.
+ attr_value.val.blockval = pattr;
+ attr_value.aux.blocklen = 16;
+ pattr += 16;
+ break;
+ }
+ case elfcpp::DW_FORM_ref_sig8:
+ attr_value.val.uintval =
+ this->dwinfo_->read_from_pointer<64>(&pattr);
+ break;
+ case elfcpp::DW_FORM_ref8:
+ case elfcpp::DW_FORM_ref_sup8:
+ {
+ 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:
+ attr_value.val.uintval = read_unsigned_LEB_128(pattr, &len);
+ pattr += len;
+ break;
+ case elfcpp::DW_FORM_addrx:
+ case elfcpp::DW_FORM_GNU_addr_index:
+ attr_value.val.uintval = read_unsigned_LEB_128(pattr, &len);
+ pattr += len;
+ break;
+ case elfcpp::DW_FORM_addrx1:
+ attr_value.val.uintval = *pattr++;
+ break;
+ case elfcpp::DW_FORM_addrx2:
+ attr_value.val.uintval =
+ this->dwinfo_->read_from_pointer<16>(&pattr);
+ break;
+ case elfcpp::DW_FORM_addrx3:
+ attr_value.val.uintval =
+ this->dwinfo_->read_3bytes_from_pointer(&pattr);
+ break;
+ case elfcpp::DW_FORM_addrx4:
+ attr_value.val.uintval =
+ this->dwinfo_->read_from_pointer<32>(&pattr);
+ 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;
+ case elfcpp::DW_FORM_loclistx:
+ case elfcpp::DW_FORM_rnglistx:
+ attr_value.val.uintval = read_unsigned_LEB_128(pattr, &len);
+ pattr += len;
+ 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:
+ case elfcpp::DW_FORM_implicit_const:
+ break;
+ case elfcpp::DW_FORM_strp:
+ case elfcpp::DW_FORM_sec_offset:
+ case elfcpp::DW_FORM_strp_sup:
+ case elfcpp::DW_FORM_line_strp:
+ 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:
+ case elfcpp::DW_FORM_strx1:
+ case elfcpp::DW_FORM_addrx1:
+ pattr += 1;
+ break;
+ case elfcpp::DW_FORM_data2:
+ case elfcpp::DW_FORM_ref2:
+ case elfcpp::DW_FORM_strx2:
+ case elfcpp::DW_FORM_addrx2:
+ pattr += 2;
+ break;
+ case elfcpp::DW_FORM_strx3:
+ case elfcpp::DW_FORM_addrx3:
+ pattr += 3;
+ break;
+ case elfcpp::DW_FORM_data4:
+ case elfcpp::DW_FORM_ref4:
+ case elfcpp::DW_FORM_ref_sup4:
+ case elfcpp::DW_FORM_strx4:
+ case elfcpp::DW_FORM_addrx4:
+ pattr += 4;
+ break;
+ case elfcpp::DW_FORM_data8:
+ case elfcpp::DW_FORM_ref8:
+ case elfcpp::DW_FORM_ref_sig8:
+ case elfcpp::DW_FORM_ref_sup8:
+ pattr += 8;
+ break;
+ case elfcpp::DW_FORM_data16:
+ pattr += 16;
+ break;
+ case elfcpp::DW_FORM_ref_udata:
+ case elfcpp::DW_FORM_udata:
+ case elfcpp::DW_FORM_addrx:
+ case elfcpp::DW_FORM_strx:
+ case elfcpp::DW_FORM_loclistx:
+ case elfcpp::DW_FORM_rnglistx:
+ 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;
+
+ // DWARF 5: Read the unit type (1 byte) and address size (1 byte).
+ if (this->cu_version_ >= 5)
+ {
+ this->unit_type_ = *pinfo++;
+ this->address_size_ = *pinfo++;
+ }
+
+ // 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_;
+
+ // DWARF 2-4: Read address_size (1 byte).
+ if (this->cu_version_ < 5)
+ 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;
+}
+
+// Read a 3-byte integer. Update SOURCE after read.
+inline typename elfcpp::Valtype_base<32>::Valtype
+Dwarf_info_reader::read_3bytes_from_pointer(const unsigned char** source)
+{
+ typename elfcpp::Valtype_base<32>::Valtype return_value;
+ if (this->object_->is_big_endian())
+ return_value = ((*source)[0] << 16) | ((*source)[1] << 8) | (*source)[2];
+ else
+ return_value = ((*source)[2] << 16) | ((*source)[1] << 8) | (*source)[0];
+ *source += 3;
+ 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
+
struct LineStateMachine
{
int file_num;
Object* object,
unsigned int read_shndx)
: data_valid_(false), buffer_(NULL), buffer_start_(NULL),
- symtab_buffer_(NULL), directories_(), files_(), current_header_index_(-1)
+ str_buffer_(NULL), str_buffer_start_(NULL),
+ reloc_mapper_(NULL), symtab_buffer_(NULL), directories_(), files_(),
+ current_header_index_(-1), reloc_map_(), line_number_map_()
{
- unsigned int debug_shndx;
+ unsigned int debug_line_shndx = 0;
+ unsigned int debug_line_str_shndx = 0;
- for (debug_shndx = 1; debug_shndx < object->shnum(); ++debug_shndx)
+ for (unsigned int i = 1; i < object->shnum(); ++i)
{
+ section_size_type buffer_size;
+ bool is_new = false;
+
// FIXME: do this more efficiently: section_name() isn't super-fast
- std::string name = object->section_name(debug_shndx);
+ std::string name = object->section_name(i);
if (name == ".debug_line" || name == ".zdebug_line")
{
- section_size_type buffer_size;
- bool is_new = false;
- this->buffer_ = object->decompressed_section_contents(debug_shndx,
- &buffer_size,
- &is_new);
+ this->buffer_ =
+ object->decompressed_section_contents(i, &buffer_size, &is_new);
if (is_new)
this->buffer_start_ = this->buffer_;
this->buffer_end_ = this->buffer_ + buffer_size;
- break;
+ debug_line_shndx = i;
+ }
+ else if (name == ".debug_line_str" || name == ".zdebug_line_str")
+ {
+ this->str_buffer_ =
+ object->decompressed_section_contents(i, &buffer_size, &is_new);
+ if (is_new)
+ this->str_buffer_start_ = this->str_buffer_;
+ this->str_buffer_end_ = this->str_buffer_ + buffer_size;
+ debug_line_str_shndx = i;
}
+ if (debug_line_shndx > 0 && debug_line_str_shndx > 0)
+ break;
}
if (this->buffer_ == NULL)
return;
// Find the relocation section for ".debug_line".
// We expect these for relobjs (.o's) but not dynobjs (.so's).
- bool got_relocs = false;
- for (unsigned int reloc_shndx = 0;
- reloc_shndx < object->shnum();
- ++reloc_shndx)
+ unsigned int reloc_shndx = 0;
+ for (unsigned int i = 0; i < object->shnum(); ++i)
{
- unsigned int reloc_sh_type = object->section_type(reloc_shndx);
+ unsigned int reloc_sh_type = object->section_type(i);
if ((reloc_sh_type == elfcpp::SHT_REL
|| reloc_sh_type == elfcpp::SHT_RELA)
- && object->section_info(reloc_shndx) == debug_shndx)
+ && object->section_info(i) == debug_line_shndx)
{
- got_relocs = this->track_relocs_.initialize(object, reloc_shndx,
- reloc_sh_type);
+ reloc_shndx = i;
this->track_relocs_type_ = reloc_sh_type;
break;
}
}
// Finally, we need the symtab section to interpret the relocs.
- if (got_relocs)
+ if (reloc_shndx != 0)
{
unsigned int symtab_shndx;
for (symtab_shndx = 0; symtab_shndx < object->shnum(); ++symtab_shndx)
if (object->section_type(symtab_shndx) == elfcpp::SHT_SYMTAB)
{
- this->symtab_buffer_ = object->section_contents(
- symtab_shndx, &this->symtab_buffer_size_, false);
+ this->symtab_buffer_ = object->section_contents(
+ symtab_shndx, &this->symtab_buffer_size_, false);
break;
}
if (this->symtab_buffer_ == NULL)
return;
}
+ this->reloc_mapper_ =
+ new Sized_elf_reloc_mapper<size, big_endian>(object,
+ this->symtab_buffer_,
+ this->symtab_buffer_size_);
+ if (!this->reloc_mapper_->initialize(reloc_shndx, this->track_relocs_type_))
+ return;
+
// Now that we have successfully read all the data, parse the debug
// info.
this->data_valid_ = true;
- this->read_line_mappings(object, read_shndx);
+ this->read_line_mappings(read_shndx);
}
// Read the DWARF header.
uint32_t initial_length = elfcpp::Swap_unaligned<32, big_endian>::readval(lineptr);
lineptr += 4;
- // In DWARF2/3, if the initial length is all 1 bits, then the offset
+ // In DWARF, if the initial length is all 1 bits, then the offset
// size is 8 and we need to read the next 8 bytes for the real length.
if (initial_length == 0xffffffff)
{
- header_.offset_size = 8;
+ this->header_.offset_size = 8;
initial_length = elfcpp::Swap_unaligned<64, big_endian>::readval(lineptr);
lineptr += 8;
}
else
- header_.offset_size = 4;
+ this->header_.offset_size = 4;
- header_.total_length = initial_length;
+ this->header_.total_length = initial_length;
- gold_assert(lineptr + header_.total_length <= buffer_end_);
+ this->end_of_unit_ = lineptr + initial_length;
+ gold_assert(this->end_of_unit_ <= buffer_end_);
- header_.version = elfcpp::Swap_unaligned<16, big_endian>::readval(lineptr);
+ this->header_.version =
+ elfcpp::Swap_unaligned<16, big_endian>::readval(lineptr);
lineptr += 2;
- if (header_.offset_size == 4)
- header_.prologue_length = elfcpp::Swap_unaligned<32, big_endian>::readval(lineptr);
+ // We can only read versions 2-5 of the DWARF line number table.
+ // For other versions, just skip the entire line number table.
+ if (this->header_.version < 2 || this->header_.version > 5)
+ return this->end_of_unit_;
+
+ // DWARF 5 only: address size and segment selector.
+ if (this->header_.version >= 5)
+ {
+ this->header_.address_size = *lineptr;
+ // We ignore the segment selector.
+ lineptr += 2;
+ }
+
+ if (this->header_.offset_size == 4)
+ this->header_.prologue_length =
+ elfcpp::Swap_unaligned<32, big_endian>::readval(lineptr);
else
- header_.prologue_length = elfcpp::Swap_unaligned<64, big_endian>::readval(lineptr);
- lineptr += header_.offset_size;
+ this->header_.prologue_length =
+ elfcpp::Swap_unaligned<64, big_endian>::readval(lineptr);
+ lineptr += this->header_.offset_size;
- header_.min_insn_length = *lineptr;
+ this->end_of_header_length_ = lineptr;
+
+ this->header_.min_insn_length = *lineptr;
lineptr += 1;
- header_.default_is_stmt = *lineptr;
+ if (this->header_.version < 4)
+ this->header_.max_ops_per_insn = 1;
+ else
+ {
+ // DWARF 4 added the maximum_operations_per_instruction field.
+ this->header_.max_ops_per_insn = *lineptr;
+ lineptr += 1;
+ // TODO: Add support for values other than 1.
+ gold_assert(this->header_.max_ops_per_insn == 1);
+ }
+
+ this->header_.default_is_stmt = *lineptr;
lineptr += 1;
- header_.line_base = *reinterpret_cast<const signed char*>(lineptr);
+ this->header_.line_base = *reinterpret_cast<const signed char*>(lineptr);
lineptr += 1;
- header_.line_range = *lineptr;
+ this->header_.line_range = *lineptr;
lineptr += 1;
- header_.opcode_base = *lineptr;
+ this->header_.opcode_base = *lineptr;
lineptr += 1;
- header_.std_opcode_lengths.resize(header_.opcode_base + 1);
- header_.std_opcode_lengths[0] = 0;
- for (int i = 1; i < header_.opcode_base; i++)
+ this->header_.std_opcode_lengths.resize(this->header_.opcode_base + 1);
+ this->header_.std_opcode_lengths[0] = 0;
+ for (int i = 1; i < this->header_.opcode_base; i++)
{
- header_.std_opcode_lengths[i] = *lineptr;
+ this->header_.std_opcode_lengths[i] = *lineptr;
lineptr += 1;
}
// The header for a debug_line section is mildly complicated, because
// the line info is very tightly encoded.
+// This routine is for DWARF versions 2, 3, and 4.
template<int size, bool big_endian>
const unsigned char*
-Sized_dwarf_line_info<size, big_endian>::read_header_tables(
+Sized_dwarf_line_info<size, big_endian>::read_header_tables_v2(
const unsigned char* lineptr)
{
++this->current_header_index_;
return lineptr;
}
+// This routine is for DWARF version 5.
+
+template<int size, bool big_endian>
+const unsigned char*
+Sized_dwarf_line_info<size, big_endian>::read_header_tables_v5(
+ const unsigned char* lineptr)
+{
+ size_t len;
+
+ ++this->current_header_index_;
+
+ gold_assert(static_cast<int>(this->directories_.size())
+ == this->current_header_index_);
+ gold_assert(static_cast<int>(this->files_.size())
+ == this->current_header_index_);
+
+ // Read the directory list.
+ unsigned int format_count = *lineptr;
+ lineptr += 1;
+
+ unsigned int *types = new unsigned int[format_count];
+ unsigned int *forms = new unsigned int[format_count];
+
+ for (unsigned int i = 0; i < format_count; i++)
+ {
+ types[i] = read_unsigned_LEB_128(lineptr, &len);
+ lineptr += len;
+ forms[i] = read_unsigned_LEB_128(lineptr, &len);
+ lineptr += len;
+ }
+
+ uint64_t entry_count = read_unsigned_LEB_128(lineptr, &len);
+ lineptr += len;
+ this->directories_.push_back(std::vector<std::string>(0));
+ std::vector<std::string>& dir_list = this->directories_.back();
+
+ for (unsigned int j = 0; j < entry_count; j++)
+ {
+ std::string dirname;
+
+ for (unsigned int i = 0; i < format_count; i++)
+ {
+ if (types[i] == elfcpp::DW_LNCT_path)
+ {
+ if (forms[i] == elfcpp::DW_FORM_string)
+ {
+ dirname = reinterpret_cast<const char*>(lineptr);
+ lineptr += dirname.size() + 1;
+ }
+ else if (forms[i] == elfcpp::DW_FORM_line_strp)
+ {
+ uint64_t offset;
+ if (this->header_.offset_size == 4)
+ offset =
+ elfcpp::Swap_unaligned<32, big_endian>::readval(lineptr);
+ else
+ offset =
+ elfcpp::Swap_unaligned<64, big_endian>::readval(lineptr);
+ typename Reloc_map::const_iterator it
+ = this->reloc_map_.find(lineptr - this->buffer_);
+ if (it != reloc_map_.end())
+ {
+ if (this->track_relocs_type_ == elfcpp::SHT_RELA)
+ offset = 0;
+ offset += it->second.second;
+ }
+ lineptr += this->header_.offset_size;
+ dirname = reinterpret_cast<const char*>(this->str_buffer_
+ + offset);
+ }
+ else
+ return lineptr;
+ }
+ else
+ return lineptr;
+ }
+ dir_list.push_back(dirname);
+ }
+
+ delete[] types;
+ delete[] forms;
+
+ // Read the filenames list.
+ format_count = *lineptr;
+ lineptr += 1;
+
+ types = new unsigned int[format_count];
+ forms = new unsigned int[format_count];
+
+ for (unsigned int i = 0; i < format_count; i++)
+ {
+ types[i] = read_unsigned_LEB_128(lineptr, &len);
+ lineptr += len;
+ forms[i] = read_unsigned_LEB_128(lineptr, &len);
+ lineptr += len;
+ }
+
+ entry_count = read_unsigned_LEB_128(lineptr, &len);
+ lineptr += len;
+ this->files_.push_back(
+ std::vector<std::pair<int, std::string> >(0));
+ std::vector<std::pair<int, std::string> >& file_list = this->files_.back();
+
+ for (unsigned int j = 0; j < entry_count; j++)
+ {
+ const char* path = NULL;
+ int dirindex = 0;
+
+ for (unsigned int i = 0; i < format_count; i++)
+ {
+ if (types[i] == elfcpp::DW_LNCT_path)
+ {
+ if (forms[i] == elfcpp::DW_FORM_string)
+ {
+ path = reinterpret_cast<const char*>(lineptr);
+ lineptr += strlen(path) + 1;
+ }
+ else if (forms[i] == elfcpp::DW_FORM_line_strp)
+ {
+ uint64_t offset;
+ if (this->header_.offset_size == 4)
+ offset = elfcpp::Swap_unaligned<32, big_endian>::readval(lineptr);
+ else
+ offset = elfcpp::Swap_unaligned<64, big_endian>::readval(lineptr);
+ typename Reloc_map::const_iterator it
+ = this->reloc_map_.find(lineptr - this->buffer_);
+ if (it != reloc_map_.end())
+ {
+ if (this->track_relocs_type_ == elfcpp::SHT_RELA)
+ offset = 0;
+ offset += it->second.second;
+ }
+ lineptr += this->header_.offset_size;
+ path = reinterpret_cast<const char*>(this->str_buffer_
+ + offset);
+ }
+ else
+ return lineptr;
+ }
+ else if (types[i] == elfcpp::DW_LNCT_directory_index)
+ {
+ if (forms[i] == elfcpp::DW_FORM_udata)
+ {
+ dirindex = read_unsigned_LEB_128(lineptr, &len);
+ lineptr += len;
+ }
+ else
+ return lineptr;
+ }
+ else
+ return lineptr;
+ }
+ gold_debug(DEBUG_LOCATION, "File %3d: %s",
+ static_cast<int>(file_list.size()), path);
+ file_list.push_back(std::make_pair(dirindex, path));
+ }
+
+ delete[] types;
+ delete[] forms;
+
+ return lineptr;
+}
+
// Process a single opcode in the .debug.line structure.
template<int size, bool big_endian>
// If the opcode is great than the opcode_base, it is a special
// opcode. Most line programs consist mainly of special opcodes.
- if (opcode >= header_.opcode_base)
+ if (opcode >= this->header_.opcode_base)
{
- opcode -= header_.opcode_base;
- const int advance_address = ((opcode / header_.line_range)
- * header_.min_insn_length);
+ opcode -= this->header_.opcode_base;
+ const int advance_address = ((opcode / this->header_.line_range)
+ * this->header_.min_insn_length);
lsm->address += advance_address;
- const int advance_line = ((opcode % header_.line_range)
- + header_.line_base);
+ const int advance_line = ((opcode % this->header_.line_range)
+ + this->header_.line_base);
lsm->line_num += advance_line;
lsm->basic_block = true;
*len = oplen;
const uint64_t advance_address
= read_unsigned_LEB_128(start, &templen);
oplen += templen;
- lsm->address += header_.min_insn_length * advance_address;
+ lsm->address += this->header_.min_insn_length * advance_address;
}
break;
case elfcpp::DW_LNS_advance_line:
{
- const uint64_t advance_line = read_signed_LEB_128(start, &templen);
+ const int64_t advance_line = read_signed_LEB_128(start, &templen);
oplen += templen;
lsm->line_num += advance_line;
}
case elfcpp::DW_LNS_const_add_pc:
{
- const int advance_address = (header_.min_insn_length
- * ((255 - header_.opcode_base)
- / header_.line_range));
+ const int advance_address = (this->header_.min_insn_length
+ * ((255 - this->header_.opcode_base)
+ / this->header_.line_range));
lsm->address += advance_address;
}
break;
start += templen;
uint64_t dirindex = read_unsigned_LEB_128(start, &templen);
- oplen += templen;
if (dirindex >= this->directories_.back().size())
dirindex = 0;
int dirindexi = static_cast<int>(dirindex);
- read_unsigned_LEB_128(start, &templen); // mod_time
- oplen += templen;
-
- read_unsigned_LEB_128(start, &templen); // filelength
- oplen += templen;
+ // This opcode takes two additional ULEB128 parameters
+ // (mod_time and filelength), but we don't use those
+ // values. Because OPLEN already tells us how far to
+ // skip to the next opcode, we don't need to read
+ // them at all.
this->files_.back().push_back(std::make_pair(dirindexi,
filename));
default:
{
// Ignore unknown opcode silently
- for (int i = 0; i < header_.std_opcode_lengths[opcode]; i++)
+ for (int i = 0; i < this->header_.std_opcode_lengths[opcode]; i++)
{
size_t templen;
read_unsigned_LEB_128(start, &templen);
template<int size, bool big_endian>
unsigned const char*
Sized_dwarf_line_info<size, big_endian>::read_lines(unsigned const char* lineptr,
+ unsigned const char* endptr,
unsigned int shndx)
{
struct LineStateMachine lsm;
- // LENGTHSTART is the place the length field is based on. It is the
- // point in the header after the initial length field.
- const unsigned char* lengthstart = buffer_;
-
- // In 64 bit dwarf, the initial length is 12 bytes, because of the
- // 0xffffffff at the start.
- if (header_.offset_size == 8)
- lengthstart += 12;
- else
- lengthstart += 4;
-
- while (lineptr < lengthstart + header_.total_length)
+ while (lineptr < endptr)
{
- ResetLineStateMachine(&lsm, header_.default_is_stmt);
+ ResetLineStateMachine(&lsm, this->header_.default_is_stmt);
while (!lsm.end_sequence)
{
size_t oplength;
+
+ if (lineptr >= endptr)
+ break;
+
bool add_line = this->process_one_opcode(lineptr, &lsm, &oplength);
+ lineptr += oplength;
+
if (add_line
&& (shndx == -1U || lsm.shndx == -1U || shndx == lsm.shndx))
{
map.back().last_line_for_offset = false;
map.push_back(entry);
}
- lineptr += oplength;
}
}
- return lengthstart + header_.total_length;
-}
-
-// Looks in the symtab to see what section a symbol is in.
-
-template<int size, bool big_endian>
-unsigned int
-Sized_dwarf_line_info<size, big_endian>::symbol_section(
- Object* object,
- unsigned int sym,
- typename elfcpp::Elf_types<size>::Elf_Addr* value,
- bool* is_ordinary)
-{
- const int symsize = elfcpp::Elf_sizes<size>::sym_size;
- gold_assert(sym * symsize < this->symtab_buffer_size_);
- elfcpp::Sym<size, big_endian> elfsym(this->symtab_buffer_ + sym * symsize);
- *value = elfsym.get_st_value();
- return object->adjust_sym_shndx(sym, elfsym.get_st_shndx(), is_ordinary);
+ return endptr;
}
// Read the relocations into a Reloc_map.
template<int size, bool big_endian>
void
-Sized_dwarf_line_info<size, big_endian>::read_relocs(Object* object)
+Sized_dwarf_line_info<size, big_endian>::read_relocs()
{
if (this->symtab_buffer_ == NULL)
return;
- typename elfcpp::Elf_types<size>::Elf_Addr value;
+ off_t value;
off_t reloc_offset;
- while ((reloc_offset = this->track_relocs_.next_offset()) != -1)
+ while ((reloc_offset = this->reloc_mapper_->next_offset()) != -1)
{
- const unsigned int sym = this->track_relocs_.next_symndx();
-
- bool is_ordinary;
- const unsigned int shndx = this->symbol_section(object, sym, &value,
- &is_ordinary);
+ const unsigned int shndx =
+ this->reloc_mapper_->get_reloc_target(reloc_offset, &value);
// There is no reason to record non-ordinary section indexes, or
// SHN_UNDEF, because they will never match the real section.
- if (is_ordinary && shndx != elfcpp::SHN_UNDEF)
- {
- value += this->track_relocs_.next_addend();
- this->reloc_map_[reloc_offset] = std::make_pair(shndx, value);
- }
+ if (shndx != 0)
+ this->reloc_map_[reloc_offset] = std::make_pair(shndx, value);
- this->track_relocs_.advance(reloc_offset + 1);
+ this->reloc_mapper_->advance(reloc_offset + 1);
}
}
template<int size, bool big_endian>
void
-Sized_dwarf_line_info<size, big_endian>::read_line_mappings(Object* object,
- unsigned int shndx)
+Sized_dwarf_line_info<size, big_endian>::read_line_mappings(unsigned int shndx)
{
gold_assert(this->data_valid_ == true);
- this->read_relocs(object);
+ this->read_relocs();
while (this->buffer_ < this->buffer_end_)
{
const unsigned char* lineptr = this->buffer_;
lineptr = this->read_header_prolog(lineptr);
- lineptr = this->read_header_tables(lineptr);
- lineptr = this->read_lines(lineptr, shndx);
- this->buffer_ = lineptr;
+ if (this->header_.version >= 2 && this->header_.version <= 4)
+ {
+ lineptr = this->read_header_tables_v2(lineptr);
+ lineptr = this->read_lines(lineptr, this->end_of_unit_, shndx);
+ }
+ else if (this->header_.version == 5)
+ {
+ lineptr = this->read_header_tables_v5(lineptr);
+ lineptr = this->read_lines(lineptr, this->end_of_unit_, shndx);
+ }
+ this->buffer_ = this->end_of_unit_;
}
// Sort the lines numbers, so addr2line can use binary search.
off_t offset,
std::vector<std::string>* other_lines)
{
+ gold_debug(DEBUG_LOCATION, "do_addr2line: shndx %u offset %08x",
+ shndx, static_cast<int>(offset));
+
if (this->data_valid_ == false)
return "";
return "";
std::string result = this->format_file_lineno(*it);
+ gold_debug(DEBUG_LOCATION, "do_addr2line: canonical result: %s",
+ result.c_str());
if (other_lines != NULL)
- for (++it; it != offsets->end() && it->offset == offset; ++it)
- {
- if (it->line_num == -1)
- continue; // The end of a previous function.
- other_lines->push_back(this->format_file_lineno(*it));
- }
+ {
+ unsigned int last_file_num = it->file_num;
+ int last_line_num = it->line_num;
+ // Return up to 4 more locations from the beginning of the function
+ // for fuzzy matching.
+ for (++it; it != offsets->end(); ++it)
+ {
+ if (it->offset == offset && it->line_num == -1)
+ continue; // The end of a previous function.
+ if (it->line_num == -1)
+ break; // The end of the current function.
+ if (it->file_num != last_file_num || it->line_num != last_line_num)
+ {
+ other_lines->push_back(this->format_file_lineno(*it));
+ gold_debug(DEBUG_LOCATION, "do_addr2line: other: %s",
+ other_lines->back().c_str());
+ last_file_num = it->file_num;
+ last_line_num = it->line_num;
+ }
+ if (it->offset > offset && other_lines->size() >= 4)
+ break;
+ }
+ }
+
return result;
}
gold_assert(loc.header_num < static_cast<int>(this->files_.size()));
gold_assert(loc.file_num
- < static_cast<int>(this->files_[loc.header_num].size()));
+ < static_cast<unsigned int>(this->files_[loc.header_num].size()));
const std::pair<int, std::string>& filename_pair
= this->files_[loc.header_num][loc.file_num];
const std::string& filename = filename_pair.second;
projects / thirdparty / binutils-gdb.git / blobdiff