[PATCH] [InputGraph][Gnu] Add Linkerscript support.

[Shankar Kalpathi Easwaran]

Hi Bigcheese, kledzik, ruiu,

This adds new functionality in the InputGraph to parse LinkerScripts.
    
a) Adds support to expand nodes in the InputGraph.
b) Support for Hidden nodes(Nodes that are internal to the InputGraph, and not part of resolution and parsing).
c) Adds a GnuLdScript/ELFGNULdScript node.

With this dynamic glibc helloworld runs fine(dynamic 'C').

As mentioned earlier by Bigcheese, it also links with libstdc++ with appropriate relocations (dynamic) but fails to run.

<-----------------snip---------------->
 $type g++
g++ is hashed (/usr/bin/g++)
$cat a.cpp
#include <iostream>
#include <stdio.h>

class A{
public:
  A() {
    std::cout << "A" << std::endl;
  }

  ~A() {
    std::cout << "~A" << std::endl;
  }
};

int main()
{
  A a;
  return 0;
}

$g++ -B`pwd` a.cpp
lld -flavor gnu --build-id --eh-frame-hdr -m elf_x86_64 --hash-style=both -dynamic-linker /lib64/ld-linux-x86-64.so.2 -z relro /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/crt1.o /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/crti.o /usr/lib/gcc/x86_64-linux-gnu/4.8/crtbegin.o -L/usr2/seaswara/tests/lld/extratests/dyncpp -L/usr/lib/gcc/x86_64-linux-gnu/4.8 -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib -L/lib/../lib -L/usr/lib/../lib -L/usr/lib/gcc/x86_64-linux-gnu/4.8/../../.. /tmp/ccPK1vpI.o -lstdc++ -lm -lgcc_s -lgcc -lc -lgcc_s -lgcc /usr/lib/gcc/x86_64-linux-gnu/4.8/crtend.o /usr/lib/gcc/x86_64-linux-gnu/4.8/../../../../lib/crtn.o

$readelf -r a.out

Relocation section '.rela.dyn' at offset 0x796 contains 1 entries:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
0000004b0298  000100000005 R_X86_64_COPY     00000000004b0298 _ZSt4cout + 0

Relocation section '.rela.plt' at offset 0x7ae contains 18 entries:
  Offset          Info           Type           Sym. Value    Sym. Name + Addend
0000004ac248  000d00000007 R_X86_64_JUMP_SLO 0000000000000000 _Unwind_Resume + 0
0000004ac250  000300000007 R_X86_64_JUMP_SLO 0000000000000000 _ZNSt8ios_base4InitC1E + 0
0000004ac258  000500000007 R_X86_64_JUMP_SLO 0000000000000000 _ZNSt8ios_base4InitD1E + 0
0000004ac260  000200000007 R_X86_64_JUMP_SLO 0000000000000000 _ZStlsISt11char_traits + 0
0000004ac268  000600000007 R_X86_64_JUMP_SLO 0000000000000000 _ZSt4endlIcSt11char_tr + 0
0000004ac270  000700000007 R_X86_64_JUMP_SLO 0000000000000000 _ZNSolsEPFRSoS_E + 0
0000004ac278  000800000007 R_X86_64_JUMP_SLO 0000000000000000 __gxx_personality_v0 + 0
0000004ac280  000000000025 R_X86_64_IRELATIV                    0000000000419300
0000004ac288  001700000007 R_X86_64_JUMP_SLO 0000000000000000 __gcc_personality_v0 + 0
0000004ac290  000000000025 R_X86_64_IRELATIV                    0000000000413860
0000004ac298  000000000025 R_X86_64_IRELATIV                    000000000042ef10
0000004ac2a0  000000000025 R_X86_64_IRELATIV                    0000000000421140
0000004ac2a8  000000000025 R_X86_64_IRELATIV                    000000000042b520
0000004ac2b0  000000000025 R_X86_64_IRELATIV                    0000000000432ba0
0000004ac2b8  000000000025 R_X86_64_IRELATIV                    00000000004668e0
0000004ac2c0  000000000025 R_X86_64_IRELATIV                    0000000000464e50
0000004ac2c8  001900000007 R_X86_64_JUMP_SLO 0000000000000000 _Unwind_Backtrace + 0
0000004ac2d0  001800000007 R_X86_64_JUMP_SLO 0000000000000000 _Unwind_GetIP + 0

$./a.out
unexpected reloc type in static binaryAborted

<------------------snip----------------->


http://llvm-reviews.chandlerc.com/D2225

Files:
  include/lld/Core/Error.h
  include/lld/Core/File.h
  include/lld/Core/InputGraph.h
  include/lld/Core/LinkingContext.h
  include/lld/Driver/GnuLdInputGraph.h
  include/lld/ReaderWriter/ELFLinkingContext.h
  include/lld/ReaderWriter/ReaderLinkerScript.h
  lib/Core/Error.cpp
  lib/Core/InputGraph.cpp
  lib/Core/Resolver.cpp
  lib/Driver/CMakeLists.txt
  lib/Driver/Driver.cpp
  lib/Driver/GnuLdDriver.cpp
  lib/Driver/GnuLdInputGraph.cpp
  lib/ReaderWriter/CMakeLists.txt
  lib/ReaderWriter/ELF/ELFLinkingContext.cpp
  lib/ReaderWriter/ReaderLinkerScript.cpp
  unittests/DriverTests/GnuLdDriverTest.cpp
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