[Bug binutils/17677] _bfd_elf_get_synthetic_symtab runs in O(n^2) complexity

[cvs-commit at gcc dot gnu.org]

https://sourceware.org/bugzilla/show_bug.cgi?id=17677

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https://sourceware.org/git/gitweb.cgi?p=binutils-gdb.git;h=cd4294b2619e6b0e1ea0e553dbdfab40db814485

commit cd4294b2619e6b0e1ea0e553dbdfab40db814485
Author: H.J. Lu <address@hidden>
Date:   Thu Dec 4 14:19:41 2014 -0800

    Add _bfd_elf_ifunc_get_synthetic_symtab

    In i386 and x86-64 binaries with ifunc, relocations against .got.plt
    section may not be in the same order as entries in PLT section.  This
    patch adds _bfd_elf_ifunc_get_synthetic_symtab.  It takes a function
    pointer which returns an array of PLT entry symbol values.  It calls
    the function pointer to get the PLT entry symbol value array indexed
    by relocation index, instead of calling plt_sym_val on each relocation
    index.

        PR binutils/17677
        * elf-bfd.h (_bfd_elf_ifunc_get_synthetic_symtab): New prototype.
        * elf-ifunc.c (_bfd_elf_ifunc_get_synthetic_symtab): New
        function.
        * elf32-i386.c (elf_i386_plt_sym_val): Removed.
        (elf_backend_plt_sym_val): Likewise.
        (elf_i386_get_plt_sym_val): New.
        (elf_i386_get_synthetic_symtab): Likewise.
        (bfd_elf32_get_synthetic_symtab): Likewise.
        * elf64-x86-64.c (elf_x86_64_plt_sym_val): Removed.
        (elf_x86_64_plt_sym_val_offset_plt_bnd): Likewise.
        (elf_backend_plt_sym_val): Likewise.
        (elf_x86_64_get_plt_sym_val): New.
        (bfd_elf32_get_synthetic_symtab): Likewise.
        (elf_x86_64_get_synthetic_symtab): Use
        _bfd_elf_ifunc_get_synthetic_symtab.
        (bfd_elf64_get_synthetic_symtab): Don't undefine for NaCl.

-----------------------------------------------------------------------

Summary of changes:
 bfd/ChangeLog      |   23 +++++
 bfd/elf-bfd.h      |    3 +
 bfd/elf-ifunc.c    |  125 +++++++++++++++++++++++++++
 bfd/elf32-i386.c   |  101 ++++++++++++++++-------
 bfd/elf64-x86-64.c |  237 +++++++++++++++++-----------------------------------
 5 files changed, 298 insertions(+), 191 deletions(-)

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