#include "elfcpp_swap.h"
#include "dwarf.h"
#include "object.h"
+#include "parameters.h"
#include "reloc.h"
#include "dwarf_reader.h"
}
template<int size, bool big_endian>
-Dwarf_line_info<size, big_endian>::Dwarf_line_info(
- Sized_relobj<size, big_endian>* object)
- : data_valid_(true), buffer_(NULL), symtab_buffer_(NULL),
- directories_(1), files_(1)
+Sized_dwarf_line_info<size, big_endian>::Sized_dwarf_line_info(Object* object)
+ : data_valid_(false), buffer_(NULL), symtab_buffer_(NULL),
+ directories_(), files_(), current_header_index_(-1)
{
unsigned int debug_shndx;
for (debug_shndx = 0; debug_shndx < object->shnum(); ++debug_shndx)
break;
}
if (this->buffer_ == NULL)
- {
- this->data_valid_ = false;
- return;
- }
+ 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();
break;
}
}
- if (!got_relocs)
- {
- this->data_valid_ = false;
- return;
- }
// Finally, we need the symtab section to interpret the relocs.
- unsigned int symtab_shndx;
- for (symtab_shndx = 0; symtab_shndx < object->shnum(); ++symtab_shndx)
- if (object->section_type(symtab_shndx) == elfcpp::SHT_SYMTAB)
- {
- off_t symtab_size;
- this->symtab_buffer_ = object->section_contents(
- symtab_shndx, &symtab_size, false);
- this->symtab_buffer_end_ = this->symtab_buffer_ + symtab_size;
- break;
- }
- if (this->symtab_buffer_ == NULL)
+ if (got_relocs)
{
- this->data_valid_ = false;
- return;
+ 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);
+ break;
+ }
+ if (this->symtab_buffer_ == NULL)
+ return;
}
// Now that we have successfully read all the data, parse the debug
// info.
+ this->data_valid_ = true;
this->read_line_mappings();
}
template<int size, bool big_endian>
const unsigned char*
-Dwarf_line_info<size, big_endian>::read_header_prolog(
+Sized_dwarf_line_info<size, big_endian>::read_header_prolog(
const unsigned char* lineptr)
{
uint32_t initial_length = elfcpp::Swap<32, big_endian>::readval(lineptr);
template<int size, bool big_endian>
const unsigned char*
-Dwarf_line_info<size, big_endian>::read_header_tables(
+Sized_dwarf_line_info<size, big_endian>::read_header_tables(
const unsigned char* lineptr)
{
+ ++this->current_header_index_;
+
+ // Create a new directories_ entry and a new files_ entry for our new
+ // header. We initialize each with a single empty element, because
+ // dwarf indexes directory and filenames starting at 1.
+ gold_assert(static_cast<int>(this->directories_.size())
+ == this->current_header_index_);
+ gold_assert(static_cast<int>(this->files_.size())
+ == this->current_header_index_);
+ this->directories_.push_back(std::vector<std::string>(1));
+ this->files_.push_back(std::vector<std::pair<int, std::string> >(1));
+
// It is legal for the directory entry table to be empty.
if (*lineptr)
{
int dirindex = 1;
while (*lineptr)
{
- const unsigned char* dirname = lineptr;
- gold_assert(dirindex == static_cast<int>(directories_.size()));
- directories_.push_back(reinterpret_cast<const char*>(dirname));
- lineptr += directories_.back().size() + 1;
+ const char* dirname = reinterpret_cast<const char*>(lineptr);
+ gold_assert(dirindex
+ == static_cast<int>(this->directories_.back().size()));
+ this->directories_.back().push_back(dirname);
+ lineptr += this->directories_.back().back().size() + 1;
dirindex++;
}
}
lineptr += strlen(filename) + 1;
uint64_t dirindex = read_unsigned_LEB_128(lineptr, &len);
- if (dirindex >= directories_.size())
- dirindex = 0;
lineptr += len;
+ if (dirindex >= this->directories_.back().size())
+ dirindex = 0;
+ int dirindexi = static_cast<int>(dirindex);
+
read_unsigned_LEB_128(lineptr, &len); // mod_time
lineptr += len;
read_unsigned_LEB_128(lineptr, &len); // filelength
lineptr += len;
- gold_assert(fileindex == static_cast<int>(files_.size()));
- files_.push_back(std::pair<int, std::string>(dirindex, filename));
+ gold_assert(fileindex
+ == static_cast<int>(this->files_.back().size()));
+ this->files_.back().push_back(std::make_pair(dirindexi, filename));
fileindex++;
}
}
template<int size, bool big_endian>
bool
-Dwarf_line_info<size, big_endian>::process_one_opcode(
+Sized_dwarf_line_info<size, big_endian>::process_one_opcode(
const unsigned char* start, struct LineStateMachine* lsm, size_t* len)
{
size_t oplen = 0;
switch (extended_op)
{
case elfcpp::DW_LNE_end_sequence:
+ // This means that the current byte is the one immediately
+ // after a set of instructions. Record the current line
+ // for up to one less than the current address.
+ lsm->line_num = -1;
lsm->end_sequence = true;
*len = oplen;
return true;
case elfcpp::DW_LNE_set_address:
{
+ lsm->address = elfcpp::Swap<size, big_endian>::readval(start);
typename Reloc_map::const_iterator it
= reloc_map_.find(start - this->buffer_);
if (it != reloc_map_.end())
{
// value + addend.
- lsm->address =
- (elfcpp::Swap<size, big_endian>::readval(start)
- + it->second.second);
+ lsm->address += it->second.second;
lsm->shndx = it->second.first;
}
else
{
- // Every set_address should have an associated
- // relocation.
- this->data_valid_ = false;
+ // If we're a normal .o file, with relocs, every
+ // set_address should have an associated relocation.
+ if (this->input_is_relobj())
+ this->data_valid_ = false;
}
break;
}
start += templen;
uint64_t dirindex = read_unsigned_LEB_128(start, &templen);
- if (dirindex >= directories_.size())
- dirindex = 0;
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;
- files_.push_back(std::pair<int, std::string>(dirindex,
+ this->files_.back().push_back(std::make_pair(dirindexi,
filename));
}
break;
template<int size, bool big_endian>
unsigned const char*
-Dwarf_line_info<size, big_endian>::read_lines(unsigned const char* lineptr)
+Sized_dwarf_line_info<size, big_endian>::read_lines(unsigned const char* lineptr)
{
struct LineStateMachine lsm;
if (add_line)
{
Offset_to_lineno_entry entry
- = { lsm.address, lsm.file_num, lsm.line_num };
+ = { lsm.address, this->current_header_index_,
+ lsm.file_num, lsm.line_num };
line_number_map_[lsm.shndx].push_back(entry);
}
lineptr += oplength;
template<int size, bool big_endian>
unsigned int
-Dwarf_line_info<size, big_endian>::symbol_section(
+Sized_dwarf_line_info<size, big_endian>::symbol_section(
unsigned int sym,
typename elfcpp::Elf_types<size>::Elf_Addr* value)
{
const int symsize = elfcpp::Elf_sizes<size>::sym_size;
- gold_assert(this->symtab_buffer_ + sym * symsize < this->symtab_buffer_end_);
+ 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 elfsym.get_st_shndx();
template<int size, bool big_endian>
void
-Dwarf_line_info<size, big_endian>::read_relocs()
+Sized_dwarf_line_info<size, big_endian>::read_relocs()
{
if (this->symtab_buffer_ == NULL)
return;
template<int size, bool big_endian>
void
-Dwarf_line_info<size, big_endian>::read_line_mappings()
+Sized_dwarf_line_info<size, big_endian>::read_line_mappings()
{
- if (this->data_valid_ == false)
- return;
+ gold_assert(this->data_valid_ == true);
read_relocs();
while (this->buffer_ < this->buffer_end_)
std::sort(it->second.begin(), it->second.end());
}
+// Some processing depends on whether the input is a .o file or not.
+// For instance, .o files have relocs, and have .debug_lines
+// information on a per section basis. .so files, on the other hand,
+// lack relocs, and offsets are unique, so we can ignore the section
+// information.
+
+template<int size, bool big_endian>
+bool
+Sized_dwarf_line_info<size, big_endian>::input_is_relobj()
+{
+ // Only .o files have relocs and the symtab buffer that goes with them.
+ return this->symtab_buffer_ != NULL;
+}
+
+// Given an Offset_to_lineno_entry vector, and an offset, figure out
+// if the offset points into a function according to the vector (see
+// comments below for the algorithm). If it does, return an iterator
+// into the vector that points to the line-number that contains that
+// offset. If not, it returns vector::end().
+
+static std::vector<Offset_to_lineno_entry>::const_iterator
+offset_to_iterator(const std::vector<Offset_to_lineno_entry>* offsets,
+ off_t offset)
+{
+ const Offset_to_lineno_entry lookup_key = { offset, 0, 0, 0 };
+
+ // lower_bound() returns the smallest offset which is >= lookup_key.
+ // If no offset in offsets is >= lookup_key, returns end().
+ std::vector<Offset_to_lineno_entry>::const_iterator it
+ = std::lower_bound(offsets->begin(), offsets->end(), lookup_key);
+
+ // This code is easiest to understand with a concrete example.
+ // Here's a possible offsets array:
+ // {{offset = 3211, header_num = 0, file_num = 1, line_num = 16}, // 0
+ // {offset = 3224, header_num = 0, file_num = 1, line_num = 20}, // 1
+ // {offset = 3226, header_num = 0, file_num = 1, line_num = 22}, // 2
+ // {offset = 3231, header_num = 0, file_num = 1, line_num = 25}, // 3
+ // {offset = 3232, header_num = 0, file_num = 1, line_num = -1}, // 4
+ // {offset = 3232, header_num = 0, file_num = 1, line_num = 65}, // 5
+ // {offset = 3235, header_num = 0, file_num = 1, line_num = 66}, // 6
+ // {offset = 3236, header_num = 0, file_num = 1, line_num = -1}, // 7
+ // {offset = 5764, header_num = 0, file_num = 1, line_num = 47}, // 8
+ // {offset = 5765, header_num = 0, file_num = 1, line_num = 48}, // 9
+ // {offset = 5767, header_num = 0, file_num = 1, line_num = 49}, // 10
+ // {offset = 5768, header_num = 0, file_num = 1, line_num = 50}, // 11
+ // {offset = 5773, header_num = 0, file_num = 1, line_num = -1}, // 12
+ // {offset = 5787, header_num = 1, file_num = 1, line_num = 19}, // 13
+ // {offset = 5790, header_num = 1, file_num = 1, line_num = 20}, // 14
+ // {offset = 5793, header_num = 1, file_num = 1, line_num = 67}, // 15
+ // {offset = 5793, header_num = 1, file_num = 1, line_num = -1}, // 16
+ // {offset = 5795, header_num = 1, file_num = 1, line_num = 68}, // 17
+ // {offset = 5798, header_num = 1, file_num = 1, line_num = -1}, // 18
+ // The entries with line_num == -1 mark the end of a function: the
+ // associated offset is one past the last instruction in the
+ // function. This can correspond to the beginning of the next
+ // function (as is true for offset 3232); alternately, there can be
+ // a gap between the end of one function and the start of the next
+ // (as is true for some others, most obviously from 3236->5764).
+ //
+ // Case 1: lookup_key has offset == 10. lower_bound returns
+ // offsets[0]. Since it's not an exact match and we're
+ // at the beginning of offsets, we return end() (invalid).
+ // Case 2: lookup_key has offset 10000. lower_bound returns
+ // offset[19] (end()). We return end() (invalid).
+ // Case 3: lookup_key has offset == 3211. lower_bound matches
+ // offsets[0] exactly, and that's the entry we return.
+ // Case 4: lookup_key has offset == 3232. lower_bound returns
+ // offsets[4]. That's an exact match, but indicates
+ // end-of-function. We check if offsets[5] is also an
+ // exact match but not end-of-function. It is, so we
+ // return offsets[5].
+ // Case 5: lookup_key has offset == 3214. lower_bound returns
+ // offsets[1]. Since it's not an exact match, we back
+ // up to the offset that's < lookup_key, offsets[0].
+ // We note offsets[0] is a valid entry (not end-of-function),
+ // so that's the entry we return.
+ // Case 6: lookup_key has offset == 4000. lower_bound returns
+ // offsets[8]. Since it's not an exact match, we back
+ // up to offsets[7]. Since offsets[7] indicates
+ // end-of-function, we know lookup_key is between
+ // functions, so we return end() (not a valid offset).
+ // Case 7: lookup_key has offset == 5794. lower_bound returns
+ // offsets[17]. Since it's not an exact match, we back
+ // up to offsets[15]. Note we back up to the *first*
+ // entry with offset 5793, not just offsets[17-1].
+ // We note offsets[15] is a valid entry, so we return it.
+ // If offsets[15] had had line_num == -1, we would have
+ // checked offsets[16]. The reason for this is that
+ // 15 and 16 can be in an arbitrary order, since we sort
+ // only by offset. (Note it doesn't help to use line_number
+ // as a secondary sort key, since sometimes we want the -1
+ // to be first and sometimes we want it to be last.)
+
+ // This deals with cases (1) and (2).
+ if ((it == offsets->begin() && offset < it->offset)
+ || it == offsets->end())
+ return offsets->end();
+
+ // This deals with cases (3) and (4).
+ if (offset == it->offset)
+ {
+ while (it != offsets->end()
+ && it->offset == offset
+ && it->line_num == -1)
+ ++it;
+ if (it == offsets->end() || it->offset != offset)
+ return offsets->end();
+ else
+ return it;
+ }
+
+ // This handles the first part of case (7) -- we back up to the
+ // *first* entry that has the offset that's behind us.
+ gold_assert(it != offsets->begin());
+ std::vector<Offset_to_lineno_entry>::const_iterator range_end = it;
+ --it;
+ const off_t range_value = it->offset;
+ while (it != offsets->begin() && (it-1)->offset == range_value)
+ --it;
+
+ // This handles cases (5), (6), and (7): if any entry in the
+ // equal_range [it, range_end) has a line_num != -1, it's a valid
+ // match. If not, we're not in a function.
+ for (; it != range_end; ++it)
+ if (it->line_num != -1)
+ return it;
+ return offsets->end();
+}
+
// Return a string for a file name and line number.
template<int size, bool big_endian>
std::string
-Dwarf_line_info<size, big_endian>::addr2line(unsigned int shndx, off_t offset)
+Sized_dwarf_line_info<size, big_endian>::do_addr2line(unsigned int shndx,
+ off_t offset)
{
if (this->data_valid_ == false)
return "";
- const Offset_to_lineno_entry lookup_key = { offset, 0, 0 };
- std::vector<Offset_to_lineno_entry>& offsets = this->line_number_map_[shndx];
- if (offsets.empty())
+ const std::vector<Offset_to_lineno_entry>* offsets;
+ // If we do not have reloc information, then our input is a .so or
+ // some similar data structure where all the information is held in
+ // the offset. In that case, we ignore the input shndx.
+ if (this->input_is_relobj())
+ offsets = &this->line_number_map_[shndx];
+ else
+ offsets = &this->line_number_map_[-1U];
+ if (offsets->empty())
return "";
typename std::vector<Offset_to_lineno_entry>::const_iterator it
- = std::lower_bound(offsets.begin(), offsets.end(), lookup_key);
-
- // If we found an exact match, great, otherwise find the last entry
- // before the passed-in offset.
- if (it->offset > offset)
- {
- if (it == offsets.begin())
- return "";
- --it;
- gold_assert(it->offset < offset);
- }
+ = offset_to_iterator(offsets, offset);
+ if (it == offsets->end())
+ return "";
// Convert the file_num + line_num into a string.
std::string ret;
- gold_assert(it->file_num < static_cast<int>(files_.size()));
- const std::pair<int, std::string>& filename_pair = files_[it->file_num];
- gold_assert(filename_pair.first < static_cast<int>(directories_.size()));
- const std::string& dirname = directories_[filename_pair.first];
+
+ gold_assert(it->header_num < static_cast<int>(this->files_.size()));
+ gold_assert(it->file_num
+ < static_cast<int>(this->files_[it->header_num].size()));
+ const std::pair<int, std::string>& filename_pair
+ = this->files_[it->header_num][it->file_num];
const std::string& filename = filename_pair.second;
+
+ gold_assert(it->header_num < static_cast<int>(this->directories_.size()));
+ gold_assert(filename_pair.first
+ < static_cast<int>(this->directories_[it->header_num].size()));
+ const std::string& dirname
+ = this->directories_[it->header_num][filename_pair.first];
+
if (!dirname.empty())
{
ret += dirname;
return ret;
}
+// Dwarf_line_info routines.
+
+std::string
+Dwarf_line_info::one_addr2line(Object* object,
+ unsigned int shndx, off_t offset)
+{
+ if (parameters->get_size() == 32 && !parameters->is_big_endian())
+#ifdef HAVE_TARGET_32_LITTLE
+ return Sized_dwarf_line_info<32, false>(object).addr2line(shndx, offset);
+#else
+ gold_unreachable();
+#endif
+ else if (parameters->get_size() == 32 && parameters->is_big_endian())
+#ifdef HAVE_TARGET_32_BIG
+ return Sized_dwarf_line_info<32, true>(object).addr2line(shndx, offset);
+#else
+ gold_unreachable();
+#endif
+ else if (parameters->get_size() == 64 && !parameters->is_big_endian())
+#ifdef HAVE_TARGET_64_LITTLE
+ return Sized_dwarf_line_info<64, false>(object).addr2line(shndx, offset);
+#else
+ gold_unreachable();
+#endif
+ else if (parameters->get_size() == 64 && parameters->is_big_endian())
+#ifdef HAVE_TARGET_64_BIT
+ return Sized_dwarf_line_info<64, true>(object).addr2line(shndx, offset);
+#else
+ gold_unreachable();
+#endif
+ else
+ gold_unreachable();
+}
+
#ifdef HAVE_TARGET_32_LITTLE
template
-class Dwarf_line_info<32, false>;
+class Sized_dwarf_line_info<32, false>;
#endif
#ifdef HAVE_TARGET_32_BIG
template
-class Dwarf_line_info<32, true>;
+class Sized_dwarf_line_info<32, true>;
#endif
#ifdef HAVE_TARGET_64_LITTLE
template
-class Dwarf_line_info<64, false>;
+class Sized_dwarf_line_info<64, false>;
#endif
#ifdef HAVE_TARGET_64_BIG
template
-class Dwarf_line_info<64, true>;
+class Sized_dwarf_line_info<64, true>;
#endif
} // End namespace gold.
projects / deliverable / binutils-gdb.git / blobdiff