#include "object.h"
#include "dynobj.h"
#include "plugin.h"
+#include "compressed_output.h"
+#include "incremental.h"
namespace gold
{
+// Struct Read_symbols_data.
+
+// Destroy any remaining File_view objects.
+
+Read_symbols_data::~Read_symbols_data()
+{
+ if (this->section_headers != NULL)
+ delete this->section_headers;
+ if (this->section_names != NULL)
+ delete this->section_names;
+ if (this->symbols != NULL)
+ delete this->symbols;
+ if (this->symbol_names != NULL)
+ delete this->symbol_names;
+ if (this->versym != NULL)
+ delete this->versym;
+ if (this->verdef != NULL)
+ delete this->verdef;
+ if (this->verneed != NULL)
+ delete this->verneed;
+}
+
// Class Xindex.
// Initialize the symtab_xindex_ array. Find the SHT_SYMTAB_SHNDX
return false;
}
+// Finalize the incremental relocation information. Allocates a block
+// of relocation entries for each symbol, and sets the reloc_bases_
+// array to point to the first entry in each block. Returns the next
+// available reloation index.
+
+void
+Relobj::finalize_incremental_relocs(Layout* layout)
+{
+ unsigned int nsyms = this->get_global_symbols()->size();
+ this->reloc_bases_ = new unsigned int[nsyms];
+
+ gold_assert(this->reloc_bases_ != NULL);
+ gold_assert(layout->incremental_inputs() != NULL);
+
+ unsigned int rindex = layout->incremental_inputs()->get_reloc_count();
+ for (unsigned int i = 0; i < nsyms; ++i)
+ {
+ this->reloc_bases_[i] = rindex;
+ rindex += this->reloc_counts_[i];
+ this->reloc_counts_[i] = 0;
+ }
+ layout->incremental_inputs()->set_reloc_count(rindex);
+}
+
// Class Sized_relobj.
template<int size, bool big_endian>
local_dynsym_offset_(0),
local_values_(),
local_got_offsets_(),
+ local_plt_offsets_(),
kept_comdat_sections_(),
has_eh_frame_(false),
- discarded_eh_frame_shndx_(-1U)
+ discarded_eh_frame_shndx_(-1U),
+ deferred_layout_(),
+ deferred_layout_relocs_(),
+ compressed_sections_()
{
}
return false;
}
+// Build a table for any compressed debug sections, mapping each section index
+// to the uncompressed size.
+
+template<int size, bool big_endian>
+Compressed_section_map*
+build_compressed_section_map(
+ const unsigned char* pshdrs,
+ unsigned int shnum,
+ const char* names,
+ section_size_type names_size,
+ Sized_relobj<size, big_endian>* obj)
+{
+ Compressed_section_map* uncompressed_sizes = new Compressed_section_map();
+ const unsigned int shdr_size = elfcpp::Elf_sizes<size>::shdr_size;
+ const unsigned char* p = pshdrs + shdr_size;
+ for (unsigned int i = 1; i < shnum; ++i, p += shdr_size)
+ {
+ typename elfcpp::Shdr<size, big_endian> shdr(p);
+ if (shdr.get_sh_type() == elfcpp::SHT_PROGBITS
+ && (shdr.get_sh_flags() & elfcpp::SHF_ALLOC) == 0)
+ {
+ if (shdr.get_sh_name() >= names_size)
+ {
+ obj->error(_("bad section name offset for section %u: %lu"),
+ i, static_cast<unsigned long>(shdr.get_sh_name()));
+ continue;
+ }
+
+ const char* name = names + shdr.get_sh_name();
+ if (is_compressed_debug_section(name))
+ {
+ section_size_type len;
+ const unsigned char* contents =
+ obj->section_contents(i, &len, false);
+ uint64_t uncompressed_size = get_uncompressed_size(contents, len);
+ if (uncompressed_size != -1ULL)
+ (*uncompressed_sizes)[i] =
+ convert_to_section_size_type(uncompressed_size);
+ }
+ }
+ }
+ return uncompressed_sizes;
+}
+
// Read the sections and symbols from an object file.
template<int size, bool big_endian>
if (this->find_eh_frame(pshdrs, names, sd->section_names_size))
this->has_eh_frame_ = true;
}
+ if (memmem(names, sd->section_names_size, ".zdebug_", 8) != NULL)
+ this->compressed_sections_ =
+ build_compressed_section_map(pshdrs, this->shnum(), names,
+ sd->section_names_size, this);
sd->symbols = NULL;
sd->symbols_size = 0;
}
}
+ // Add the section to the incremental inputs layout.
+ Incremental_inputs* incremental_inputs = layout->incremental_inputs();
+ if (incremental_inputs != NULL)
+ incremental_inputs->report_input_section(this, i,
+ discard ? NULL : name,
+ shdr.get_sh_size());
+
if (discard)
{
// Do not include this section in the link.
}
}
- if (!is_gc_pass_one)
+ if (!is_gc_pass_two)
layout->layout_gnu_stack(seen_gnu_stack, gnu_stack_flags);
// When doing a relocatable link handle the reloc sections at the
}
Output_section* data_section = out_sections[data_shndx];
+ if (data_section == reinterpret_cast<Output_section*>(2))
+ {
+ // The layout for the data section was deferred, so we need
+ // to defer the relocation section, too.
+ const char* name = pnames + shdr.get_sh_name();
+ this->deferred_layout_relocs_.push_back(
+ Deferred_layout(i, name, pshdr, 0, elfcpp::SHT_NULL));
+ out_sections[i] = reinterpret_cast<Output_section*>(2);
+ out_section_offsets[i] = invalid_address;
+ continue;
+ }
if (data_section == NULL)
{
out_sections[i] = NULL;
gold_assert(external_symbols_offset != 0);
unsigned int i = *p;
- const unsigned char *pshdr;
+ const unsigned char* pshdr;
pshdr = section_headers_data + i * This::shdr_size;
typename This::Shdr shdr(pshdr);
++deferred)
{
typename This::Shdr shdr(deferred->shdr_data_);
+ // If the section is not included, it is because the garbage collector
+ // decided it is not needed. Avoid reverting that decision.
+ if (!this->is_section_included(deferred->shndx_))
+ continue;
+
this->layout_section(layout, deferred->shndx_, deferred->name_.c_str(),
shdr, deferred->reloc_shndx_, deferred->reloc_type_);
}
this->deferred_layout_.clear();
+
+ // Now handle the deferred relocation sections.
+
+ Output_sections& out_sections(this->output_sections());
+ std::vector<Address>& out_section_offsets(this->section_offsets_);
+
+ for (deferred = this->deferred_layout_relocs_.begin();
+ deferred != this->deferred_layout_relocs_.end();
+ ++deferred)
+ {
+ unsigned int shndx = deferred->shndx_;
+ typename This::Shdr shdr(deferred->shdr_data_);
+ unsigned int data_shndx = this->adjust_shndx(shdr.get_sh_info());
+
+ Output_section* data_section = out_sections[data_shndx];
+ if (data_section == NULL)
+ {
+ out_sections[shndx] = NULL;
+ out_section_offsets[shndx] = invalid_address;
+ continue;
+ }
+
+ Relocatable_relocs* rr = new Relocatable_relocs();
+ this->set_relocatable_relocs(shndx, rr);
+
+ Output_section* os = layout->layout_reloc(this, shndx, shdr,
+ data_section, rr);
+ out_sections[shndx] = os;
+ out_section_offsets[shndx] = invalid_address;
+ }
}
// Add the symbols to the symbol table.
sd->symbol_names = NULL;
}
+// Find out if this object, that is a member of a lib group, should be included
+// in the link. We check every symbol defined by this object. If the symbol
+// table has a strong undefined reference to that symbol, we have to include
+// the object.
+
+template<int size, bool big_endian>
+Archive::Should_include
+Sized_relobj<size, big_endian>::do_should_include_member(Symbol_table* symtab,
+ Layout* layout,
+ Read_symbols_data* sd,
+ std::string* why)
+{
+ char* tmpbuf = NULL;
+ size_t tmpbuflen = 0;
+ const char* sym_names =
+ reinterpret_cast<const char*>(sd->symbol_names->data());
+ const unsigned char* syms =
+ sd->symbols->data() + sd->external_symbols_offset;
+ const int sym_size = elfcpp::Elf_sizes<size>::sym_size;
+ size_t symcount = ((sd->symbols_size - sd->external_symbols_offset)
+ / sym_size);
+
+ const unsigned char* p = syms;
+
+ for (size_t i = 0; i < symcount; ++i, p += sym_size)
+ {
+ elfcpp::Sym<size, big_endian> sym(p);
+ unsigned int st_shndx = sym.get_st_shndx();
+ if (st_shndx == elfcpp::SHN_UNDEF)
+ continue;
+
+ unsigned int st_name = sym.get_st_name();
+ const char* name = sym_names + st_name;
+ Symbol* symbol;
+ Archive::Should_include t = Archive::should_include_member(symtab,
+ layout,
+ name,
+ &symbol, why,
+ &tmpbuf,
+ &tmpbuflen);
+ if (t == Archive::SHOULD_INCLUDE_YES)
+ {
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ return t;
+ }
+ }
+ if (tmpbuf != NULL)
+ free(tmpbuf);
+ return Archive::SHOULD_INCLUDE_UNKNOWN;
+}
+
+// Return whether the local symbol SYMNDX has a PLT offset.
+
+template<int size, bool big_endian>
+bool
+Sized_relobj<size, big_endian>::local_has_plt_offset(unsigned int symndx) const
+{
+ typename Local_plt_offsets::const_iterator p =
+ this->local_plt_offsets_.find(symndx);
+ return p != this->local_plt_offsets_.end();
+}
+
+// Get the PLT offset of a local symbol.
+
+template<int size, bool big_endian>
+unsigned int
+Sized_relobj<size, big_endian>::local_plt_offset(unsigned int symndx) const
+{
+ typename Local_plt_offsets::const_iterator p =
+ this->local_plt_offsets_.find(symndx);
+ gold_assert(p != this->local_plt_offsets_.end());
+ return p->second;
+}
+
+// Set the PLT offset of a local symbol.
+
+template<int size, bool big_endian>
+void
+Sized_relobj<size, big_endian>::set_local_plt_offset(unsigned int symndx,
+ unsigned int plt_offset)
+{
+ std::pair<typename Local_plt_offsets::iterator, bool> ins =
+ this->local_plt_offsets_.insert(std::make_pair(symndx, plt_offset));
+ gold_assert(ins.second);
+}
+
// First pass over the local symbols. Here we add their names to
// *POOL and *DYNPOOL, and we store the symbol value in
// THIS->LOCAL_VALUES_. This function is always called from a
lv.set_is_section_symbol();
else if (sym.get_st_type() == elfcpp::STT_TLS)
lv.set_is_tls_symbol();
+ else if (sym.get_st_type() == elfcpp::STT_GNU_IFUNC)
+ lv.set_is_ifunc_symbol();
// Save the input symbol value for use in do_finalize_local_symbols().
lv.set_input_value(sym.get_st_value());
++dyncount;
}
- if (discard_all)
+ if (discard_all && lv.may_be_discarded_from_output_symtab())
{
lv.set_no_output_symtab_entry();
continue;
if (discard_locals
&& sym.get_st_type() != elfcpp::STT_FILE
&& !lv.needs_output_dynsym_entry()
+ && lv.may_be_discarded_from_output_symtab()
&& parameters->target().is_local_label_name(name))
{
lv.set_no_output_symtab_entry();
this->output_local_dynsym_count_ = dyncount;
}
+// Compute the final value of a local symbol.
+
+template<int size, bool big_endian>
+typename Sized_relobj<size, big_endian>::Compute_final_local_value_status
+Sized_relobj<size, big_endian>::compute_final_local_value_internal(
+ unsigned int r_sym,
+ const Symbol_value<size>* lv_in,
+ Symbol_value<size>* lv_out,
+ bool relocatable,
+ const Output_sections& out_sections,
+ const std::vector<Address>& out_offsets,
+ const Symbol_table* symtab)
+{
+ // We are going to overwrite *LV_OUT, if it has a merged symbol value,
+ // we may have a memory leak.
+ gold_assert(lv_out->has_output_value());
+
+ bool is_ordinary;
+ unsigned int shndx = lv_in->input_shndx(&is_ordinary);
+
+ // Set the output symbol value.
+
+ if (!is_ordinary)
+ {
+ if (shndx == elfcpp::SHN_ABS || Symbol::is_common_shndx(shndx))
+ lv_out->set_output_value(lv_in->input_value());
+ else
+ {
+ this->error(_("unknown section index %u for local symbol %u"),
+ shndx, r_sym);
+ lv_out->set_output_value(0);
+ return This::CFLV_ERROR;
+ }
+ }
+ else
+ {
+ if (shndx >= this->shnum())
+ {
+ this->error(_("local symbol %u section index %u out of range"),
+ r_sym, shndx);
+ lv_out->set_output_value(0);
+ return This::CFLV_ERROR;
+ }
+
+ Output_section* os = out_sections[shndx];
+ Address secoffset = out_offsets[shndx];
+ if (symtab->is_section_folded(this, shndx))
+ {
+ gold_assert(os == NULL && secoffset == invalid_address);
+ // Get the os of the section it is folded onto.
+ Section_id folded = symtab->icf()->get_folded_section(this,
+ shndx);
+ gold_assert(folded.first != NULL);
+ Sized_relobj<size, big_endian>* folded_obj = reinterpret_cast
+ <Sized_relobj<size, big_endian>*>(folded.first);
+ os = folded_obj->output_section(folded.second);
+ gold_assert(os != NULL);
+ secoffset = folded_obj->get_output_section_offset(folded.second);
+
+ // This could be a relaxed input section.
+ if (secoffset == invalid_address)
+ {
+ const Output_relaxed_input_section* relaxed_section =
+ os->find_relaxed_input_section(folded_obj, folded.second);
+ gold_assert(relaxed_section != NULL);
+ secoffset = relaxed_section->address() - os->address();
+ }
+ }
+
+ if (os == NULL)
+ {
+ // This local symbol belongs to a section we are discarding.
+ // In some cases when applying relocations later, we will
+ // attempt to match it to the corresponding kept section,
+ // so we leave the input value unchanged here.
+ return This::CFLV_DISCARDED;
+ }
+ else if (secoffset == invalid_address)
+ {
+ uint64_t start;
+
+ // This is a SHF_MERGE section or one which otherwise
+ // requires special handling.
+ if (shndx == this->discarded_eh_frame_shndx_)
+ {
+ // This local symbol belongs to a discarded .eh_frame
+ // section. Just treat it like the case in which
+ // os == NULL above.
+ gold_assert(this->has_eh_frame_);
+ return This::CFLV_DISCARDED;
+ }
+ else if (!lv_in->is_section_symbol())
+ {
+ // This is not a section symbol. We can determine
+ // the final value now.
+ lv_out->set_output_value(
+ os->output_address(this, shndx, lv_in->input_value()));
+ }
+ else if (!os->find_starting_output_address(this, shndx, &start))
+ {
+ // This is a section symbol, but apparently not one in a
+ // merged section. First check to see if this is a relaxed
+ // input section. If so, use its address. Otherwise just
+ // use the start of the output section. This happens with
+ // relocatable links when the input object has section
+ // symbols for arbitrary non-merge sections.
+ const Output_section_data* posd =
+ os->find_relaxed_input_section(this, shndx);
+ if (posd != NULL)
+ {
+ Address relocatable_link_adjustment =
+ relocatable ? os->address() : 0;
+ lv_out->set_output_value(posd->address()
+ - relocatable_link_adjustment);
+ }
+ else
+ lv_out->set_output_value(os->address());
+ }
+ else
+ {
+ // We have to consider the addend to determine the
+ // value to use in a relocation. START is the start
+ // of this input section. If we are doing a relocatable
+ // link, use offset from start output section instead of
+ // address.
+ Address adjusted_start =
+ relocatable ? start - os->address() : start;
+ Merged_symbol_value<size>* msv =
+ new Merged_symbol_value<size>(lv_in->input_value(),
+ adjusted_start);
+ lv_out->set_merged_symbol_value(msv);
+ }
+ }
+ else if (lv_in->is_tls_symbol())
+ lv_out->set_output_value(os->tls_offset()
+ + secoffset
+ + lv_in->input_value());
+ else
+ lv_out->set_output_value((relocatable ? 0 : os->address())
+ + secoffset
+ + lv_in->input_value());
+ }
+ return This::CFLV_OK;
+}
+
+// Compute final local symbol value. R_SYM is the index of a local
+// symbol in symbol table. LV points to a symbol value, which is
+// expected to hold the input value and to be over-written by the
+// final value. SYMTAB points to a symbol table. Some targets may want
+// to know would-be-finalized local symbol values in relaxation.
+// Hence we provide this method. Since this method updates *LV, a
+// callee should make a copy of the original local symbol value and
+// use the copy instead of modifying an object's local symbols before
+// everything is finalized. The caller should also free up any allocated
+// memory in the return value in *LV.
+template<int size, bool big_endian>
+typename Sized_relobj<size, big_endian>::Compute_final_local_value_status
+Sized_relobj<size, big_endian>::compute_final_local_value(
+ unsigned int r_sym,
+ const Symbol_value<size>* lv_in,
+ Symbol_value<size>* lv_out,
+ const Symbol_table* symtab)
+{
+ // This is just a wrapper of compute_final_local_value_internal.
+ const bool relocatable = parameters->options().relocatable();
+ const Output_sections& out_sections(this->output_sections());
+ const std::vector<Address>& out_offsets(this->section_offsets_);
+ return this->compute_final_local_value_internal(r_sym, lv_in, lv_out,
+ relocatable, out_sections,
+ out_offsets, symtab);
+}
+
// Finalize the local symbols. Here we set the final value in
// THIS->LOCAL_VALUES_ and set their output symbol table indexes.
// This function is always called from a singleton thread. The actual
const bool relocatable = parameters->options().relocatable();
const Output_sections& out_sections(this->output_sections());
const std::vector<Address>& out_offsets(this->section_offsets_);
- unsigned int shnum = this->shnum();
for (unsigned int i = 1; i < loccount; ++i)
{
- Symbol_value<size>& lv(this->local_values_[i]);
-
- bool is_ordinary;
- unsigned int shndx = lv.input_shndx(&is_ordinary);
+ Symbol_value<size>* lv = &this->local_values_[i];
- // Set the output symbol value.
-
- if (!is_ordinary)
- {
- if (shndx == elfcpp::SHN_ABS || Symbol::is_common_shndx(shndx))
- lv.set_output_value(lv.input_value());
- else
- {
- this->error(_("unknown section index %u for local symbol %u"),
- shndx, i);
- lv.set_output_value(0);
- }
- }
- else
+ Compute_final_local_value_status cflv_status =
+ this->compute_final_local_value_internal(i, lv, lv, relocatable,
+ out_sections, out_offsets,
+ symtab);
+ switch (cflv_status)
{
- if (shndx >= shnum)
- {
- this->error(_("local symbol %u section index %u out of range"),
- i, shndx);
- shndx = 0;
- }
-
- Output_section* os = out_sections[shndx];
- Address secoffset = out_offsets[shndx];
- if (symtab->is_section_folded(this, shndx))
- {
- gold_assert (os == NULL && secoffset == invalid_address);
- // Get the os of the section it is folded onto.
- Section_id folded = symtab->icf()->get_folded_section(this,
- shndx);
- gold_assert(folded.first != NULL);
- Sized_relobj<size, big_endian>* folded_obj = reinterpret_cast
- <Sized_relobj<size, big_endian>*>(folded.first);
- os = folded_obj->output_section(folded.second);
- gold_assert(os != NULL);
- secoffset = folded_obj->get_output_section_offset(folded.second);
-
- // This could be a relaxed input section.
- if (secoffset == invalid_address)
- {
- const Output_relaxed_input_section* relaxed_section =
- os->find_relaxed_input_section(folded_obj, folded.second);
- gold_assert(relaxed_section != NULL);
- secoffset = relaxed_section->address() - os->address();
- }
- }
-
- if (os == NULL)
- {
- // This local symbol belongs to a section we are discarding.
- // In some cases when applying relocations later, we will
- // attempt to match it to the corresponding kept section,
- // so we leave the input value unchanged here.
- continue;
- }
- else if (secoffset == invalid_address)
+ case CFLV_OK:
+ if (!lv->is_output_symtab_index_set())
{
- uint64_t start;
-
- // This is a SHF_MERGE section or one which otherwise
- // requires special handling.
- if (shndx == this->discarded_eh_frame_shndx_)
- {
- // This local symbol belongs to a discarded .eh_frame
- // section. Just treat it like the case in which
- // os == NULL above.
- gold_assert(this->has_eh_frame_);
- continue;
- }
- else if (!lv.is_section_symbol())
- {
- // This is not a section symbol. We can determine
- // the final value now.
- lv.set_output_value(os->output_address(this, shndx,
- lv.input_value()));
- }
- else if (!os->find_starting_output_address(this, shndx, &start))
- {
- // This is a section symbol, but apparently not one in a
- // merged section. First check to see if this is a relaxed
- // input section. If so, use its address. Otherwise just
- // use the start of the output section. This happens with
- // relocatable links when the input object has section
- // symbols for arbitrary non-merge sections.
- const Output_section_data* posd =
- os->find_relaxed_input_section(this, shndx);
- if (posd != NULL)
- lv.set_output_value(posd->address());
- else
- lv.set_output_value(os->address());
- }
- else
- {
- // We have to consider the addend to determine the
- // value to use in a relocation. START is the start
- // of this input section.
- Merged_symbol_value<size>* msv =
- new Merged_symbol_value<size>(lv.input_value(), start);
- lv.set_merged_symbol_value(msv);
- }
+ lv->set_output_symtab_index(index);
+ ++index;
}
- else if (lv.is_tls_symbol())
- lv.set_output_value(os->tls_offset()
- + secoffset
- + lv.input_value());
- else
- lv.set_output_value((relocatable ? 0 : os->address())
- + secoffset
- + lv.input_value());
+ break;
+ case CFLV_DISCARDED:
+ case CFLV_ERROR:
+ // Do nothing.
+ break;
+ default:
+ gold_unreachable();
}
-
- if (lv.needs_output_symtab_entry())
- {
- lv.set_output_symtab_index(index);
- ++index;
- }
}
return index;
}
Sized_relobj<size, big_endian>::do_section_entsize(unsigned int shndx)
{
Symbols_data* sd = this->get_symbols_data();
- gold_assert (sd != NULL);
+ gold_assert(sd != NULL);
const unsigned char* pshdrs = sd->section_headers_data
+ This::shdr_size * shndx;
return shdr.get_sh_entsize();
}
-
// Write out the local symbols.
template<int size, bool big_endian>
st_shndx = out_sections[st_shndx]->out_shndx();
if (st_shndx >= elfcpp::SHN_LORESERVE)
{
- if (lv.needs_output_symtab_entry() && !strip_all)
+ if (lv.has_output_symtab_entry())
symtab_xindex->add(lv.output_symtab_index(), st_shndx);
- if (lv.needs_output_dynsym_entry())
+ if (lv.has_output_dynsym_entry())
dynsym_xindex->add(lv.output_dynsym_index(), st_shndx);
st_shndx = elfcpp::SHN_XINDEX;
}
}
// Write the symbol to the output symbol table.
- if (!strip_all && lv.needs_output_symtab_entry())
+ if (lv.has_output_symtab_entry())
{
elfcpp::Sym_write<size, big_endian> osym(ov);
}
// Write the symbol to the output dynamic symbol table.
- if (lv.needs_output_dynsym_entry())
+ if (lv.has_output_dynsym_entry())
{
gold_assert(dyn_ov < dyn_oview + dyn_output_size);
elfcpp::Sym_write<size, big_endian> osym(dyn_ov);
(*p)->set_has_unknown_needed_entries(!found_all);
// --copy-dt-needed-entries aka --add-needed is a GNU ld option
- // --that gold does not support. However, they cause no trouble
- // --unless there is a DT_NEEDED entry that we don't know about;
- // --warn only in that case.
+ // that gold does not support. However, they cause no trouble
+ // unless there is a DT_NEEDED entry that we don't know about;
+ // warn only in that case.
if (!found_all
&& !issued_copy_dt_needed_error
&& (parameters->options().copy_dt_needed_entries()
bool
is_elf_object(Input_file* input_file, off_t offset,
- const unsigned char** start, int *read_size)
+ const unsigned char** start, int* read_size)
{
off_t filesize = input_file->file().filesize();
int want = elfcpp::Elf_recognizer::max_header_size;
projects / deliverable / binutils-gdb.git / blobdiff