// dwarf_reader.h -- parse dwarf2/3 debug information for gold -*- C++ -*-
-// Copyright 2007, 2008, 2009 Free Software Foundation, Inc.
+// Copyright (C) 2007-2021 Free Software Foundation, Inc.
// Written by Ian Lance Taylor <iant@google.com>.
// This file is part of gold.
#include <vector>
#include <map>
+#include <limits.h>
+#include <sys/types.h>
#include "elfcpp.h"
#include "elfcpp_swap.h"
namespace gold
{
-template<int size, bool big_endian>
-class Track_relocs;
+class Dwarf_info_reader;
struct LineStateMachine;
-uint64_t
-read_unsigned_LEB_128(const unsigned char* buffer, size_t* len);
+// This class is used to extract the section index and offset of
+// the target of a relocation for a given offset within the section.
+
+class Elf_reloc_mapper
+{
+ public:
+ Elf_reloc_mapper()
+ { }
+
+ virtual
+ ~Elf_reloc_mapper()
+ { }
+
+ // Initialize the relocation tracker for section RELOC_SHNDX.
+ bool
+ initialize(unsigned int reloc_shndx, unsigned int reloc_type)
+ { return this->do_initialize(reloc_shndx, reloc_type); }
+
+ // Return the next reloc_offset.
+ off_t
+ next_offset()
+ { return this->do_next_offset(); }
+
+ // Advance to the next relocation past OFFSET.
+ void
+ advance(off_t offset)
+ { this->do_advance(offset); }
+
+ // Return the section index and offset within the section of the target
+ // of the relocation for RELOC_OFFSET in the referring section.
+ unsigned int
+ get_reloc_target(off_t reloc_offset, off_t* target_offset)
+ { return this->do_get_reloc_target(reloc_offset, target_offset); }
+
+ // Checkpoint the current position in the reloc section.
+ uint64_t
+ checkpoint() const
+ { return this->do_checkpoint(); }
+
+ // Reset the current position to the CHECKPOINT.
+ void
+ reset(uint64_t checkpoint)
+ { this->do_reset(checkpoint); }
+
+ protected:
+ virtual bool
+ do_initialize(unsigned int, unsigned int) = 0;
+
+ // Return the next reloc_offset.
+ virtual off_t
+ do_next_offset() = 0;
+
+ // Advance to the next relocation past OFFSET.
+ virtual void
+ do_advance(off_t offset) = 0;
+
+ virtual unsigned int
+ do_get_reloc_target(off_t reloc_offset, off_t* target_offset) = 0;
+
+ // Checkpoint the current position in the reloc section.
+ virtual uint64_t
+ do_checkpoint() const = 0;
+
+ // Reset the current position to the CHECKPOINT.
+ virtual void
+ do_reset(uint64_t checkpoint) = 0;
+};
+
+template<int size, bool big_endian>
+class Sized_elf_reloc_mapper : public Elf_reloc_mapper
+{
+ public:
+ Sized_elf_reloc_mapper(Object* object, const unsigned char* symtab,
+ off_t symtab_size)
+ : object_(object), symtab_(symtab), symtab_size_(symtab_size),
+ reloc_type_(0), track_relocs_()
+ { }
+
+ protected:
+ bool
+ do_initialize(unsigned int reloc_shndx, unsigned int reloc_type);
+
+ // Return the next reloc_offset.
+ virtual off_t
+ do_next_offset()
+ { return this->track_relocs_.next_offset(); }
+
+ // Advance to the next relocation past OFFSET.
+ virtual void
+ do_advance(off_t offset)
+ { this->track_relocs_.advance(offset); }
+
+ unsigned int
+ do_get_reloc_target(off_t reloc_offset, off_t* target_offset);
+
+ // Checkpoint the current position in the reloc section.
+ uint64_t
+ do_checkpoint() const
+ { return this->track_relocs_.checkpoint(); }
+
+ // Reset the current position to the CHECKPOINT.
+ void
+ do_reset(uint64_t checkpoint)
+ { this->track_relocs_.reset(checkpoint); }
-int64_t
-read_signed_LEB_128(const unsigned char* buffer, size_t* len);
+ private:
+ typedef typename elfcpp::Elf_types<size>::Elf_Addr Address;
+
+ // Return the section index of symbol SYMNDX, and copy its value to *VALUE.
+ // Set *IS_ORDINARY true if the section index is an ordinary section index.
+ unsigned int
+ symbol_section(unsigned int symndx, Address* value, bool* is_ordinary);
+
+ // The object file.
+ Object* object_;
+ // The ELF symbol table.
+ const unsigned char* symtab_;
+ // The size of the ELF symbol table.
+ off_t symtab_size_;
+ // Type of the relocation section (SHT_REL or SHT_RELA).
+ unsigned int reloc_type_;
+ // Relocations for the referring section.
+ Track_relocs<size, big_endian> track_relocs_;
+};
+
+// This class is used to read the abbreviations table from the
+// .debug_abbrev section of the object file.
+
+class Dwarf_abbrev_table
+{
+ public:
+ // An attribute list entry.
+ struct Attribute
+ {
+ Attribute(unsigned int a, unsigned int f)
+ : attr(a), form(f)
+ { }
+ unsigned int attr;
+ unsigned int form;
+ };
+
+ // An abbrev code entry.
+ struct Abbrev_code
+ {
+ Abbrev_code(unsigned int t, bool hc)
+ : tag(t), has_children(hc), has_sibling_attribute(false), attributes()
+ {
+ this->attributes.reserve(10);
+ }
+
+ void
+ add_attribute(unsigned int attr, unsigned int form)
+ {
+ this->attributes.push_back(Attribute(attr, form));
+ }
+
+ // The DWARF tag.
+ unsigned int tag;
+ // True if the DIE has children.
+ bool has_children : 1;
+ // True if the DIE has a sibling attribute.
+ bool has_sibling_attribute : 1;
+ // The list of attributes and forms.
+ std::vector<Attribute> attributes;
+ };
+
+ Dwarf_abbrev_table()
+ : abbrev_shndx_(0), abbrev_offset_(0), buffer_(NULL), buffer_end_(NULL),
+ owns_buffer_(false), buffer_pos_(NULL), high_abbrev_codes_()
+ {
+ memset(this->low_abbrev_codes_, 0, sizeof(this->low_abbrev_codes_));
+ }
+
+ ~Dwarf_abbrev_table()
+ {
+ if (this->owns_buffer_ && this->buffer_ != NULL)
+ delete[] this->buffer_;
+ this->clear_abbrev_codes();
+ }
+
+ // Read the abbrev table from an object file.
+ bool
+ read_abbrevs(Relobj* object,
+ unsigned int abbrev_shndx,
+ off_t abbrev_offset)
+ {
+ // If we've already read this abbrev table, return immediately.
+ if (this->abbrev_shndx_ > 0
+ && this->abbrev_shndx_ == abbrev_shndx
+ && this->abbrev_offset_ == abbrev_offset)
+ return true;
+ return this->do_read_abbrevs(object, abbrev_shndx, abbrev_offset);
+ }
+
+ // Return the abbrev code entry for CODE. This is a fast path for
+ // abbrev codes that are in the direct lookup table. If not found
+ // there, we call do_get_abbrev() to do the hard work.
+ const Abbrev_code*
+ get_abbrev(unsigned int code)
+ {
+ if (code < this->low_abbrev_code_max_
+ && this->low_abbrev_codes_[code] != NULL)
+ return this->low_abbrev_codes_[code];
+ return this->do_get_abbrev(code);
+ }
+
+ private:
+ // Read the abbrev table from an object file.
+ bool
+ do_read_abbrevs(Relobj* object,
+ unsigned int abbrev_shndx,
+ off_t abbrev_offset);
+
+ // Lookup the abbrev code entry for CODE.
+ const Abbrev_code*
+ do_get_abbrev(unsigned int code);
+
+ // Store an abbrev code entry for CODE.
+ void
+ store_abbrev(unsigned int code, const Abbrev_code* entry)
+ {
+ if (code < this->low_abbrev_code_max_)
+ this->low_abbrev_codes_[code] = entry;
+ else
+ this->high_abbrev_codes_[code] = entry;
+ }
+
+ // Clear the abbrev code table and release the memory it uses.
+ void
+ clear_abbrev_codes();
+
+ typedef Unordered_map<unsigned int, const Abbrev_code*> Abbrev_code_table;
+
+ // The section index of the current abbrev table.
+ unsigned int abbrev_shndx_;
+ // The offset within the section of the current abbrev table.
+ off_t abbrev_offset_;
+ // The buffer containing the .debug_abbrev section.
+ const unsigned char* buffer_;
+ const unsigned char* buffer_end_;
+ // True if this object owns the buffer and needs to delete it.
+ bool owns_buffer_;
+ // Pointer to the current position in the buffer.
+ const unsigned char* buffer_pos_;
+ // The table of abbrev codes.
+ // We use a direct-lookup array for low abbrev codes,
+ // and store the rest in a hash table.
+ static const unsigned int low_abbrev_code_max_ = 256;
+ const Abbrev_code* low_abbrev_codes_[low_abbrev_code_max_];
+ Abbrev_code_table high_abbrev_codes_;
+};
+
+// A DWARF range list. The start and end offsets are relative
+// to the input section SHNDX. Each range must lie entirely
+// within a single section.
+
+class Dwarf_range_list
+{
+ public:
+ struct Range
+ {
+ Range(unsigned int a_shndx, off_t a_start, off_t a_end)
+ : shndx(a_shndx), start(a_start), end(a_end)
+ { }
+
+ unsigned int shndx;
+ off_t start;
+ off_t end;
+ };
+
+ Dwarf_range_list()
+ : range_list_()
+ { }
+
+ void
+ add(unsigned int shndx, off_t start, off_t end)
+ { this->range_list_.push_back(Range(shndx, start, end)); }
+
+ size_t
+ size() const
+ { return this->range_list_.size(); }
+
+ const Range&
+ operator[](off_t i) const
+ { return this->range_list_[i]; }
+
+ private:
+ std::vector<Range> range_list_;
+};
+
+// This class is used to read the ranges table from the
+// .debug_ranges section of the object file.
+
+class Dwarf_ranges_table
+{
+ public:
+ Dwarf_ranges_table(Dwarf_info_reader* dwinfo)
+ : dwinfo_(dwinfo), ranges_shndx_(0), ranges_buffer_(NULL),
+ ranges_buffer_end_(NULL), owns_ranges_buffer_(false),
+ ranges_reloc_mapper_(NULL), reloc_type_(0), output_section_offset_(0)
+ { }
+
+ ~Dwarf_ranges_table()
+ {
+ if (this->owns_ranges_buffer_ && this->ranges_buffer_ != NULL)
+ delete[] this->ranges_buffer_;
+ if (this->ranges_reloc_mapper_ != NULL)
+ delete this->ranges_reloc_mapper_;
+ }
+
+ // Read the ranges table from an object file.
+ bool
+ read_ranges_table(Relobj* object,
+ const unsigned char* symtab,
+ off_t symtab_size,
+ unsigned int ranges_shndx);
+
+ // Read the range table from an object file.
+ Dwarf_range_list*
+ read_range_list(Relobj* object,
+ const unsigned char* symtab,
+ off_t symtab_size,
+ unsigned int address_size,
+ unsigned int ranges_shndx,
+ off_t ranges_offset);
+
+ // Look for a relocation at offset OFF in the range table,
+ // and return the section index and offset of the target.
+ unsigned int
+ lookup_reloc(off_t off, off_t* target_off);
+
+ private:
+ // The Dwarf_info_reader, for reading data.
+ Dwarf_info_reader* dwinfo_;
+ // The section index of the ranges table.
+ unsigned int ranges_shndx_;
+ // The buffer containing the .debug_ranges section.
+ const unsigned char* ranges_buffer_;
+ const unsigned char* ranges_buffer_end_;
+ // True if this object owns the buffer and needs to delete it.
+ bool owns_ranges_buffer_;
+ // Relocation mapper for the .debug_ranges section.
+ Elf_reloc_mapper* ranges_reloc_mapper_;
+ // Type of the relocation section (SHT_REL or SHT_RELA).
+ unsigned int reloc_type_;
+ // For incremental update links, this will hold the offset of the
+ // input section within the output section. Offsets read from
+ // relocated data will be relative to the output section, and need
+ // to be corrected before reading data from the input section.
+ uint64_t output_section_offset_;
+};
+
+// This class is used to read the pubnames and pubtypes tables from the
+// .debug_pubnames and .debug_pubtypes sections of the object file.
+
+class Dwarf_pubnames_table
+{
+ public:
+ Dwarf_pubnames_table(Dwarf_info_reader* dwinfo, bool is_pubtypes)
+ : dwinfo_(dwinfo), buffer_(NULL), buffer_end_(NULL), owns_buffer_(false),
+ offset_size_(0), pinfo_(NULL), end_of_table_(NULL),
+ is_pubtypes_(is_pubtypes), is_gnu_style_(false),
+ unit_length_(0), cu_offset_(0)
+ { }
+
+ ~Dwarf_pubnames_table()
+ {
+ if (this->owns_buffer_ && this->buffer_ != NULL)
+ delete[] this->buffer_;
+ }
+
+ // Read the pubnames section from the object file, using the symbol
+ // table for relocating it.
+ bool
+ read_section(Relobj* object, const unsigned char* symbol_table,
+ off_t symtab_size);
+
+ // Read the header for the set at OFFSET.
+ bool
+ read_header(off_t offset);
+
+ // Return the offset to the cu within the info or types section.
+ off_t
+ cu_offset()
+ { return this->cu_offset_; }
+
+ // Return the size of this subsection of the table. The unit length
+ // doesn't include the size of its own field.
+ off_t
+ subsection_size()
+ { return this->unit_length_; }
+
+ // Read the next name from the set. If the pubname table is gnu-style,
+ // FLAG_BYTE is set to the high-byte of a gdb_index version 7 cu_index.
+ const char*
+ next_name(uint8_t* flag_byte);
+
+ private:
+ // The Dwarf_info_reader, for reading data.
+ Dwarf_info_reader* dwinfo_;
+ // The buffer containing the .debug_ranges section.
+ const unsigned char* buffer_;
+ const unsigned char* buffer_end_;
+ // True if this object owns the buffer and needs to delete it.
+ bool owns_buffer_;
+ // The size of a DWARF offset for the current set.
+ unsigned int offset_size_;
+ // The current position within the buffer.
+ const unsigned char* pinfo_;
+ // The end of the current pubnames table.
+ const unsigned char* end_of_table_;
+ // TRUE if this is a .debug_pubtypes section.
+ bool is_pubtypes_;
+ // Gnu-style pubnames table. This style has an extra flag byte between the
+ // offset and the name, and is used for generating version 7 of gdb-index.
+ bool is_gnu_style_;
+ // Fields read from the header.
+ uint64_t unit_length_;
+ off_t cu_offset_;
+
+ // Track relocations for this table so we can find the CUs that
+ // correspond to the subsections.
+ Elf_reloc_mapper* reloc_mapper_;
+ // Type of the relocation section (SHT_REL or SHT_RELA).
+ unsigned int reloc_type_;
+};
+
+// This class represents a DWARF Debug Info Entry (DIE).
+
+class Dwarf_die
+{
+ public:
+ // An attribute value.
+ struct Attribute_value
+ {
+ unsigned int attr;
+ unsigned int form;
+ union
+ {
+ int64_t intval;
+ uint64_t uintval;
+ const char* stringval;
+ const unsigned char* blockval;
+ off_t refval;
+ } val;
+ union
+ {
+ // Section index for reference forms.
+ unsigned int shndx;
+ // Block length for block forms.
+ unsigned int blocklen;
+ // Attribute offset for DW_FORM_strp.
+ unsigned int attr_off;
+ } aux;
+ };
+
+ // A list of attribute values.
+ typedef std::vector<Attribute_value> Attributes;
+
+ Dwarf_die(Dwarf_info_reader* dwinfo,
+ off_t die_offset,
+ Dwarf_die* parent);
+
+ // Return the DWARF tag for this DIE.
+ unsigned int
+ tag() const
+ {
+ if (this->abbrev_code_ == NULL)
+ return 0;
+ return this->abbrev_code_->tag;
+ }
+
+ // Return true if this DIE has children.
+ bool
+ has_children() const
+ {
+ gold_assert(this->abbrev_code_ != NULL);
+ return this->abbrev_code_->has_children;
+ }
+
+ // Return true if this DIE has a sibling attribute.
+ bool
+ has_sibling_attribute() const
+ {
+ gold_assert(this->abbrev_code_ != NULL);
+ return this->abbrev_code_->has_sibling_attribute;
+ }
+
+ // Return the value of attribute ATTR.
+ const Attribute_value*
+ attribute(unsigned int attr);
+
+ // Return the value of the DW_AT_name attribute.
+ const char*
+ name()
+ {
+ if (this->name_ == NULL)
+ this->set_name();
+ return this->name_;
+ }
+
+ // Return the value of the DW_AT_linkage_name
+ // or DW_AT_MIPS_linkage_name attribute.
+ const char*
+ linkage_name()
+ {
+ if (this->linkage_name_ == NULL)
+ this->set_linkage_name();
+ return this->linkage_name_;
+ }
+
+ // Return the value of the DW_AT_specification attribute.
+ off_t
+ specification()
+ {
+ if (!this->attributes_read_)
+ this->read_attributes();
+ return this->specification_;
+ }
+
+ // Return the value of the DW_AT_abstract_origin attribute.
+ off_t
+ abstract_origin()
+ {
+ if (!this->attributes_read_)
+ this->read_attributes();
+ return this->abstract_origin_;
+ }
+
+ // Return the value of attribute ATTR as a string.
+ const char*
+ string_attribute(unsigned int attr);
+
+ // Return the value of attribute ATTR as an integer.
+ int64_t
+ int_attribute(unsigned int attr);
+
+ // Return the value of attribute ATTR as an unsigned integer.
+ uint64_t
+ uint_attribute(unsigned int attr);
+
+ // Return the value of attribute ATTR as a reference.
+ off_t
+ ref_attribute(unsigned int attr, unsigned int* shndx);
+
+ // Return the value of attribute ATTR as a address.
+ off_t
+ address_attribute(unsigned int attr, unsigned int* shndx);
+
+ // Return the value of attribute ATTR as a flag.
+ bool
+ flag_attribute(unsigned int attr)
+ { return this->int_attribute(attr) != 0; }
+
+ // Return true if this DIE is a declaration.
+ bool
+ is_declaration()
+ { return this->flag_attribute(elfcpp::DW_AT_declaration); }
+
+ // Return the parent of this DIE.
+ Dwarf_die*
+ parent() const
+ { return this->parent_; }
+
+ // Return the offset of this DIE.
+ off_t
+ offset() const
+ { return this->die_offset_; }
+
+ // Return the offset of this DIE's first child.
+ off_t
+ child_offset();
+
+ // Set the offset of this DIE's next sibling.
+ void
+ set_sibling_offset(off_t sibling_offset)
+ { this->sibling_offset_ = sibling_offset; }
+
+ // Return the offset of this DIE's next sibling.
+ off_t
+ sibling_offset();
+
+ private:
+ typedef Dwarf_abbrev_table::Abbrev_code Abbrev_code;
+
+ // Read all the attributes of the DIE.
+ bool
+ read_attributes();
+
+ // Set the name of the DIE if present.
+ void
+ set_name();
+
+ // Set the linkage name if present.
+ void
+ set_linkage_name();
+
+ // Skip all the attributes of the DIE and return the offset
+ // of the next DIE.
+ off_t
+ skip_attributes();
+
+ // The Dwarf_info_reader, for reading attributes.
+ Dwarf_info_reader* dwinfo_;
+ // The parent of this DIE.
+ Dwarf_die* parent_;
+ // Offset of this DIE within its compilation unit.
+ off_t die_offset_;
+ // Offset of the first attribute, relative to the beginning of the DIE.
+ off_t attr_offset_;
+ // Offset of the first child, relative to the compilation unit.
+ off_t child_offset_;
+ // Offset of the next sibling, relative to the compilation unit.
+ off_t sibling_offset_;
+ // The abbreviation table entry.
+ const Abbrev_code* abbrev_code_;
+ // The list of attributes.
+ Attributes attributes_;
+ // True if the attributes have been read.
+ bool attributes_read_;
+ // The following fields hold common attributes to avoid a linear
+ // search through the attribute list.
+ // The DIE name (DW_AT_name).
+ const char* name_;
+ // Offset of the name in the string table (for DW_FORM_strp).
+ off_t name_off_;
+ // The linkage name (DW_AT_linkage_name or DW_AT_MIPS_linkage_name).
+ const char* linkage_name_;
+ // Offset of the linkage name in the string table (for DW_FORM_strp).
+ off_t linkage_name_off_;
+ // Section index of the string table (for DW_FORM_strp).
+ unsigned int string_shndx_;
+ // The value of a DW_AT_specification attribute.
+ off_t specification_;
+ // The value of a DW_AT_abstract_origin attribute.
+ off_t abstract_origin_;
+};
+
+// This class is used to read the debug info from the .debug_info
+// or .debug_types sections. This is a base class that implements
+// the generic parsing of the compilation unit header and DIE
+// structure. The parse() method parses the entire section, and
+// calls the various visit_xxx() methods for each header. Clients
+// should derive a new class from this one and implement the
+// visit_compilation_unit() and visit_type_unit() functions.
+
+class Dwarf_info_reader
+{
+ public:
+ Dwarf_info_reader(bool is_type_unit,
+ Relobj* object,
+ const unsigned char* symtab,
+ off_t symtab_size,
+ unsigned int shndx,
+ unsigned int reloc_shndx,
+ unsigned int reloc_type)
+ : is_type_unit_(is_type_unit), object_(object), symtab_(symtab),
+ symtab_size_(symtab_size), shndx_(shndx), reloc_shndx_(reloc_shndx),
+ reloc_type_(reloc_type), abbrev_shndx_(0), string_shndx_(0),
+ buffer_(NULL), buffer_end_(NULL), cu_offset_(0), cu_length_(0),
+ offset_size_(0), address_size_(0), cu_version_(0),
+ abbrev_table_(), ranges_table_(this),
+ reloc_mapper_(NULL), string_buffer_(NULL), string_buffer_end_(NULL),
+ owns_string_buffer_(false), string_output_section_offset_(0)
+ { }
+
+ virtual
+ ~Dwarf_info_reader()
+ {
+ if (this->reloc_mapper_ != NULL)
+ delete this->reloc_mapper_;
+ if (this->owns_string_buffer_ && this->string_buffer_ != NULL)
+ delete[] this->string_buffer_;
+ }
+
+ // 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
+ parse();
+
+ // Return the abbrev code entry for a CODE.
+ const Dwarf_abbrev_table::Abbrev_code*
+ get_abbrev(unsigned int code)
+ { return this->abbrev_table_.get_abbrev(code); }
+
+ // Return a pointer to the DWARF info buffer at OFFSET.
+ const unsigned char*
+ buffer_at_offset(off_t offset) const
+ {
+ const unsigned char* p = this->buffer_ + this->cu_offset_ + offset;
+ if (this->check_buffer(p + 1))
+ return p;
+ return NULL;
+ }
+
+ // Read a possibly unaligned integer of SIZE.
+ template <int valsize>
+ inline typename elfcpp::Valtype_base<valsize>::Valtype
+ read_from_pointer(const unsigned char* source);
+
+ // Read a possibly unaligned integer of SIZE. Update SOURCE after read.
+ template <int valsize>
+ inline typename elfcpp::Valtype_base<valsize>::Valtype
+ read_from_pointer(const unsigned char** source);
+
+ // Look for a relocation at offset ATTR_OFF in the dwarf info,
+ // and return the section index and offset of the target.
+ unsigned int
+ lookup_reloc(off_t attr_off, off_t* target_off);
+
+ // Return a string from the DWARF string table.
+ const char*
+ get_string(off_t str_off, unsigned int string_shndx);
+
+ // Return the size of a DWARF offset.
+ unsigned int
+ offset_size() const
+ { return this->offset_size_; }
+
+ // Return the size of an address.
+ unsigned int
+ address_size() const
+ { return this->address_size_; }
+
+ // Return the size of a DW_FORM_ref_addr.
+ // In DWARF v2, this was the size of an address; in DWARF v3 and later,
+ // it is the size of an DWARF offset.
+ unsigned int
+ ref_addr_size() const
+ { return this->cu_version_ > 2 ? this->offset_size_ : this->address_size_; }
+
+ // Set the section index of the .debug_abbrev section.
+ // We use this if there are no relocations for the .debug_info section.
+ // If not set, the code parse() routine will search for the section by name.
+ void
+ set_abbrev_shndx(unsigned int abbrev_shndx)
+ { this->abbrev_shndx_ = abbrev_shndx; }
+
+ // Return a pointer to the object file's ELF symbol table.
+ const unsigned char*
+ symtab() const
+ { return this->symtab_; }
+
+ // Return the size of the object file's ELF symbol table.
+ off_t
+ symtab_size() const
+ { return this->symtab_size_; }
+
+ // Return the offset of the current compilation unit.
+ off_t
+ cu_offset() const
+ { return this->cu_offset_; }
+
+ protected:
+ // 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.
+ template<bool big_endian>
+ void
+ do_parse();
+
+ // The following methods are hooks that are meant to be implemented
+ // by a derived class. A default, do-nothing, implementation of
+ // each is provided for this base class.
+
+ // Visit a compilation unit.
+ virtual void
+ visit_compilation_unit(off_t cu_offset, off_t cu_length, Dwarf_die* root_die);
+
+ // Visit a type unit.
+ virtual void
+ visit_type_unit(off_t tu_offset, off_t tu_length, off_t type_offset,
+ uint64_t signature, Dwarf_die* root_die);
+
+ // Read the range table.
+ Dwarf_range_list*
+ read_range_list(unsigned int ranges_shndx, off_t ranges_offset)
+ {
+ return this->ranges_table_.read_range_list(this->object_,
+ this->symtab_,
+ this->symtab_size_,
+ this->address_size_,
+ ranges_shndx,
+ ranges_offset);
+ }
+
+ // Return the object.
+ Relobj*
+ object() const
+ { return this->object_; }
+
+ // Checkpoint the relocation tracker.
+ uint64_t
+ get_reloc_checkpoint() const
+ { return this->reloc_mapper_->checkpoint(); }
+
+ // Reset the relocation tracker to the CHECKPOINT.
+ void
+ reset_relocs(uint64_t checkpoint)
+ { this->reloc_mapper_->reset(checkpoint); }
+
+ private:
+ // Print a warning about a corrupt debug section.
+ void
+ warn_corrupt_debug_section() const;
+
+ // Check that P is within the bounds of the current section.
+ bool
+ check_buffer(const unsigned char* p) const
+ {
+ if (p > this->buffer_ + this->cu_offset_ + this->cu_length_)
+ {
+ this->warn_corrupt_debug_section();
+ return false;
+ }
+ return true;
+ }
+
+ // Read the DWARF string table.
+ bool
+ read_string_table(unsigned int string_shndx)
+ {
+ // If we've already read this string table, return immediately.
+ if (this->string_shndx_ > 0 && this->string_shndx_ == string_shndx)
+ return true;
+ if (string_shndx == 0 && this->string_shndx_ > 0)
+ return true;
+ return this->do_read_string_table(string_shndx);
+ }
+
+ bool
+ do_read_string_table(unsigned int string_shndx);
+
+ // True if this is a type unit; false for a compilation unit.
+ bool is_type_unit_;
+ // The object containing the .debug_info or .debug_types input section.
+ Relobj* object_;
+ // The ELF symbol table.
+ const unsigned char* symtab_;
+ // The size of the ELF symbol table.
+ off_t symtab_size_;
+ // Index of the .debug_info or .debug_types section.
+ unsigned int shndx_;
+ // Index of the relocation section.
+ unsigned int reloc_shndx_;
+ // Type of the relocation section (SHT_REL or SHT_RELA).
+ unsigned int reloc_type_;
+ // Index of the .debug_abbrev section (0 if not known).
+ unsigned int abbrev_shndx_;
+ // Index of the .debug_str section.
+ unsigned int string_shndx_;
+ // The buffer for the debug info.
+ const unsigned char* buffer_;
+ const unsigned char* buffer_end_;
+ // Offset of the current compilation unit.
+ off_t cu_offset_;
+ // Length of the current compilation unit.
+ off_t cu_length_;
+ // Size of a DWARF offset for the current compilation unit.
+ unsigned int offset_size_;
+ // Size of an address for the target architecture.
+ unsigned int address_size_;
+ // Compilation unit version number.
+ unsigned int cu_version_;
+ // Abbreviations table for current compilation unit.
+ Dwarf_abbrev_table abbrev_table_;
+ // Ranges table for the current compilation unit.
+ Dwarf_ranges_table ranges_table_;
+ // Relocation mapper for the section.
+ Elf_reloc_mapper* reloc_mapper_;
+ // The buffer for the debug string table.
+ const char* string_buffer_;
+ const char* string_buffer_end_;
+ // True if this object owns the buffer and needs to delete it.
+ bool owns_string_buffer_;
+ // For incremental update links, this will hold the offset of the
+ // input .debug_str section within the output section. Offsets read
+ // from relocated data will be relative to the output section, and need
+ // to be corrected before reading data from the input section.
+ uint64_t string_output_section_offset_;
+};
// We can't do better than to keep the offsets in a sorted vector.
// Here, offset is the key, and file_num/line_num is the value.
{
off_t offset;
int header_num; // which file-list to use (i.e. which .o file are we in)
- int file_num; // a pointer into files_
- int line_num; // the line number in the source file
- // Offsets are unique within a section, so that's a sufficient sort key.
+ // A pointer into files_.
+ unsigned int file_num : sizeof(int) * CHAR_BIT - 1;
+ // True if this was the last entry for the current offset, meaning
+ // it's the line that actually applies.
+ unsigned int last_line_for_offset : 1;
+ // The line number in the source file. -1 to indicate end-of-function.
+ int line_num;
+
+ // This sorts by offsets first, and then puts the correct line to
+ // report for a given offset at the beginning of the run of equal
+ // offsets (so that asking for 1 line gives the best answer). This
+ // is not a total ordering.
bool operator<(const Offset_to_lineno_entry& that) const
- { return this->offset < that.offset; }
+ {
+ if (this->offset != that.offset)
+ return this->offset < that.offset;
+ // Note the '>' which makes this sort 'true' first.
+ return this->last_line_for_offset > that.last_line_for_offset;
+ }
};
// This class is used to read the line information from the debugging
// Given a section number and an offset, returns the associated
// file and line-number, as a string: "file:lineno". If unable
// to do the mapping, returns the empty string. You must call
- // read_line_mappings() before calling this function.
+ // read_line_mappings() before calling this function. If
+ // 'other_lines' is non-NULL, fills that in with other line
+ // numbers assigned to the same offset.
std::string
- addr2line(unsigned int shndx, off_t offset)
- { return do_addr2line(shndx, offset); }
+ addr2line(unsigned int shndx, off_t offset,
+ std::vector<std::string>* other_lines)
+ { return this->do_addr2line(shndx, offset, other_lines); }
// A helper function for a single addr2line lookup. It also keeps a
// cache of the last CACHE_SIZE Dwarf_line_info objects it created;
// NOTE: Not thread-safe, so only call from one thread at a time.
static std::string
one_addr2line(Object* object, unsigned int shndx, off_t offset,
- size_t cache_size);
+ size_t cache_size, std::vector<std::string>* other_lines);
// This reclaims all the memory that one_addr2line may have cached.
// Use this when you know you will not be calling one_addr2line again.
private:
virtual std::string
- do_addr2line(unsigned int shndx, off_t offset) = 0;
+ do_addr2line(unsigned int shndx, off_t offset,
+ std::vector<std::string>* other_lines) = 0;
};
template<int size, bool big_endian>
// information that pertains to the specified section.
Sized_dwarf_line_info(Object* object, unsigned int read_shndx = -1U);
+ virtual
+ ~Sized_dwarf_line_info()
+ {
+ if (this->buffer_start_ != NULL)
+ delete[] this->buffer_start_;
+ }
+
private:
std::string
- do_addr2line(unsigned int shndx, off_t offset);
+ do_addr2line(unsigned int shndx, off_t offset,
+ std::vector<std::string>* other_lines);
+
+ // Formats a file and line number to a string like "dirname/filename:lineno".
+ std::string
+ format_file_lineno(const Offset_to_lineno_entry& lineno) const;
// Start processing line info, and populates the offset_map_.
// If SHNDX is non-negative, only store debug information that
// pertains to the specified section.
void
- read_line_mappings(Object*, unsigned int shndx);
+ read_line_mappings(unsigned int shndx);
// Reads the relocation section associated with .debug_line and
// stores relocation information in reloc_map_.
void
- read_relocs(Object*);
-
- // Looks in the symtab to see what section a symbol is in.
- unsigned int
- symbol_section(Object*, unsigned int sym,
- typename elfcpp::Elf_types<size>::Elf_Addr* value,
- bool* is_ordinary);
+ read_relocs();
// Reads the DWARF2/3 header for this line info. Each takes as input
// a starting buffer position, and returns the ending position.
off_t total_length;
int version;
off_t prologue_length;
- int min_insn_length; // insn stands for instructin
+ int min_insn_length; // insn stands for instruction
+ int max_ops_per_insn; // Added in DWARF-4.
bool default_is_stmt; // stmt stands for statement
signed char line_base;
int line_range;
// the line info to read is.
const unsigned char* buffer_;
const unsigned char* buffer_end_;
+ // If the buffer was allocated temporarily, and therefore must be
+ // deallocated in the dtor, this contains a pointer to the start
+ // of the buffer.
+ const unsigned char* buffer_start_;
// This has relocations that point into buffer.
- Track_relocs<size, big_endian> track_relocs_;
+ Sized_elf_reloc_mapper<size, big_endian>* reloc_mapper_;
+ // The type of the reloc section in track_relocs_--SHT_REL or SHT_RELA.
+ unsigned int track_relocs_type_;
// This is used to figure out what section to apply a relocation to.
const unsigned char* symtab_buffer_;
// A sorted map from offset of the relocation target to the shndx
// and addend for the relocation.
- typedef std::map<typename elfcpp::Elf_types<size>::Elf_Addr,
- std::pair<unsigned int,
- typename elfcpp::Elf_types<size>::Elf_Swxword> >
+ typedef std::map<off_t, std::pair<unsigned int, off_t> >
Reloc_map;
Reloc_map reloc_map_;
projects / thirdparty / binutils-gdb.git / blobdiff