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5483 Commits

Author SHA1 Message Date
Davide Italiano f7892a1f3a [ELF2] Constify member functions. 
llvm-svn: 248019
 2015-09-18 18:28:08 +00:00
Rafael Espindola 5c2310c30c Start adding support for creating the GOT. 
With this a program can call into a shared library with

  jmp *foo@GOTPCREL(%rip)

llvm-svn: 247992
 2015-09-18 14:40:19 +00:00
Davide Italiano b5b47b432b [ELF2] Fill up local symbols fields correctly. 
Differential Revision:	http://reviews.llvm.org/D12944

llvm-svn: 247960
 2015-09-18 01:08:17 +00:00
Rafael Espindola 8315b1c995 Remove dead member variable. 
llvm-svn: 247949
 2015-09-17 21:34:32 +00:00
Michael J. Spencer 2f0082424f [elf2] Combine adjacent compatible OutputSections in PT_LOADs. 
llvm-svn: 247925
 2015-09-17 19:58:07 +00:00
Rafael Espindola 40102eb27f Use a MapVector to output symbols in a deterministic order. 
We used to sort the symbols at the very end, but we need to know the order
earlier so that we can create reference to them in the dynamic relocations.

Thanks to Igor Kudrin for pointing out the problem.

llvm-svn: 247911
 2015-09-17 18:26:25 +00:00
Rafael Espindola 67a5da60ed Add support of Elf_Rel dynamic relocations. 
llvm-svn: 247888
 2015-09-17 14:02:10 +00:00
Denis Protivensky 18add764f0 [ELF2] Fix typo in RelocationSection::hasRelocs method 
llvm-svn: 247878
 2015-09-17 09:54:29 +00:00
Rafael Espindola eade07ba59 Start adding support for Elf_Rel. 
I don't intend to add full i686 support right now, just make sure we have all
the infrastructure in place for it.

llvm-svn: 247858
 2015-09-16 21:57:07 +00:00
Davide Italiano 6d328d3841 [ELF2] Initial support for local symbols. 
Symbol table is now populated correctly, but some fields are missing,
they'll be added in the future. This patch also adds --discard-all
flag, which was the default behavior until now.

Differential Revision:   http://reviews.llvm.org/D12874

llvm-svn: 247849
 2015-09-16 20:45:57 +00:00
Rafael Espindola 2b92d8f184 Move code computing NumEntries to finalize. 
When DynamicSection is constructed we still don't know if there will be
any dynamic relocations or not.

llvm-svn: 247838
 2015-09-16 19:26:31 +00:00
Rafael Espindola 3887ebfc21 Add DT_RELA and DT_RELASZ to the dynamic table. 
llvm-svn: 247837
 2015-09-16 18:52:42 +00:00
Rafael Espindola 19e3889dba Start creating dynamic relocations. 
For now we don't create got/plt and only Elf_Rela is supported.

llvm-svn: 247811
 2015-09-16 15:54:15 +00:00
Rafael Espindola 37ecff14f4 Remove redundant "protected:". 
llvm-svn: 247797
 2015-09-16 13:47:45 +00:00
Michael J. Spencer 141dd91ac5 [elf2] Simplify overflow checks. 
llvm-svn: 247768
 2015-09-16 02:02:04 +00:00
Michael J. Spencer 75e5fda3de [elf2] Add R_X86_64_32S. 
llvm-svn: 247758
 2015-09-16 00:24:19 +00:00
Michael J. Spencer dff84070da [elf2] Add error checking for the R_X86_64_32 relocation. 
llvm-svn: 247745
 2015-09-15 23:36:30 +00:00
Michael J. Spencer 3c1ac0a17a [elf2] Relocate absolute symbols. 
llvm-svn: 247738
 2015-09-15 23:12:02 +00:00
Rafael Espindola e6451d9e74 Replace isa+cast with dyn_cast. NFC. 
llvm-svn: 247691
 2015-09-15 14:08:11 +00:00
Rafael Espindola a5c97d9025 Add support for R_X86_64_64. 
llvm-svn: 247688
 2015-09-15 13:52:06 +00:00
Rafael Espindola 7d4038dc5a Use the same typedef style for all Elf_* types. 
llvm-svn: 247680
 2015-09-15 12:43:09 +00:00
Rui Ueyama b73002fb4e ELF2: Simplify by removing temporary variables. 
llvm-svn: 247652
 2015-09-15 01:03:58 +00:00
Rafael Espindola c92d28d427 Simplify, NFC. 
Thanks to Rui for the suggestion.

llvm-svn: 247637
 2015-09-14 23:28:02 +00:00
Rafael Espindola 80faee82e6 Add content to the .hash section. 
This also sets DT_HASH.

With this simple shared libraries created by lld can be loaded by the dynamic
linker.

llvm-svn: 247625
 2015-09-14 22:08:55 +00:00
Rui Ueyama 9078f73fa0 Use C++11 member initializers. NFC. 
llvm-svn: 247613
 2015-09-14 20:32:41 +00:00
Rafael Espindola 601771ebc0 Start adding the .hash output section. 
It is still empty. Content will be added in the next patch.

llvm-svn: 247609
 2015-09-14 20:20:34 +00:00
Rafael Espindola bfcdfb32af Correctly align sections. 
We have to align the start, not the end.

This should fix crashes on systems where memcpy enforces the expected
alignment.

llvm-svn: 247599
 2015-09-14 19:00:35 +00:00
Rafael Espindola 4340aad144 Start adding support for creating shared libraries. 
They are not fully functional yet, but this implements enough support for lld
itself to read them.

With that, delete the .so binary we were using for tests and start eating our
own dog food.

llvm-svn: 247487
 2015-09-11 22:42:45 +00:00
Rafael Espindola 1d12ab3db1 Fix handling of _start being undefined. 
We were crashing before.

llvm-svn: 247481
 2015-09-11 21:44:55 +00:00
Rafael Espindola 92b6c15cce Fix a copy and paste error. Sorry about that. 
llvm-svn: 247478
 2015-09-11 21:26:42 +00:00
Rafael Espindola 2e9eac13c7 Implement -rpath. 
llvm-svn: 247475
 2015-09-11 21:18:56 +00:00
Rafael Espindola 7010776db7 Implement the -dynamic-linker option. 
With this dynamic executables can be executed with just ./t instead of
/lib64/ld-2.20.so ./t

llvm-svn: 247446
 2015-09-11 18:49:42 +00:00
Rafael Espindola d67bb26642 Add more information to a comment. 
llvm-svn: 247408
 2015-09-11 13:20:07 +00:00
Rafael Espindola 243d90f549 Add a DT_SYMTAB entry in the dynamic section. 
With this a trivial shared binary runs with the glibc dynamic linker:

LD_LIBRARY_PATH=.  /lib64/ld-2.20.so ./t

llvm-svn: 247370
 2015-09-11 01:14:39 +00:00
Rafael Espindola fb815282d5 Create a dynamic symbol table. 
For now it includes every symbol in the regular table. Since we don't
create dynamic relocations yet, we don't have a good way of knowing which
symbols are actually needed.

llvm-svn: 247365
 2015-09-11 00:30:13 +00:00
Rafael Espindola 24d07fdd27 Cache the bss output section in the writer, not in the symbol table. 
There is soon going to be two symbol tables, but there will still be only one
output bss.

llvm-svn: 247363
 2015-09-11 00:10:11 +00:00
Rafael Espindola dd34a4d3c5 Make a few details of the string and symbol table private. 
This is in preparation to adding a dynamic string table.

llvm-svn: 247355
 2015-09-10 22:49:06 +00:00
Rafael Espindola 65db630fe7 Fix a warning when building with gcc. 
It was

/Writer.cpp:119:45: warning: enumeral and non-enumeral type in conditional expression

llvm-svn: 247330
 2015-09-10 20:02:22 +00:00
Rafael Espindola 0a2e211ace Create a PT_LOAD program header for the start of the file. 
With this a trivial dynamic program works with the musl dynamic linker:

LD_LIBRARY_PATH=.  ~/musl/lib/libc.so ./t

llvm-svn: 247290
 2015-09-10 15:41:34 +00:00
Rafael Espindola 60252d8feb Change the load addr into something that works on linux x86_64. 
With this simple static programs run again.

llvm-svn: 247205
 2015-09-09 22:53:55 +00:00
Michael J. Spencer 1d299a8a9d [elf2] Assign output sections to PHDRs. 
This is a minimal implementation to produce legal output. Future patches will combine multiple compatible PT_LOADs.

llvm-svn: 247185
 2015-09-09 20:48:09 +00:00
Rafael Espindola 778562fc78 Add the DT_NEEDED entries to the dynamic table. 
llvm-svn: 247181
 2015-09-09 20:26:23 +00:00
Rui Ueyama d5004e1c69 Fix indentation. 
llvm-svn: 247169
 2015-09-09 18:02:23 +00:00
Rui Ueyama 6666f6ad73 ELF2: Reduce nesting by returning early. NFC. 
llvm-svn: 247168
 2015-09-09 17:55:09 +00:00
Rui Ueyama 7da94a58a0 ELF2: Return early. NFC. 
llvm-svn: 247165
 2015-09-09 17:40:51 +00:00
Rafael Espindola 3f4228f613 Start adding content to the dynamic section. 
With this patch we create a dynamic string table (it is allocated, unlike
the regular one) and the dynamic section has a DT_STRTAB pointing to it.

llvm-svn: 247155
 2015-09-09 15:33:08 +00:00
Rafael Espindola e438e07856 Create a dynamic segment. 
It is still empty. I will add content next.

llvm-svn: 247097
 2015-09-08 22:55:28 +00:00
Michael J. Spencer ac5f048e09 [lld][elf2] Address review comments. 
llvm-svn: 247096
 2015-09-08 22:51:46 +00:00
Michael J. Spencer 546c64c733 [lld][elf2] Fix hard coded entry address. 
llvm-svn: 247089
 2015-09-08 22:34:57 +00:00
Rafael Espindola 18608a0a55 Simplify using namespaces and typedefs. NFC. 
llvm-svn: 247079
 2015-09-08 21:57:31 +00:00
Rafael Espindola b9fe03d4a9 Revert "[lld][elf2] Fix hard coded entry address." 
This reverts commit r247073.

It broke

    lld :: elf2/basic32be.s
    lld :: elf2/basic64be.s

llvm-svn: 247077
 2015-09-08 21:32:44 +00:00
Michael J. Spencer 8be15899b4 [lld][elf2] Fix hard coded entry address. 
llvm-svn: 247073
 2015-09-08 21:11:25 +00:00
Michael J. Spencer 88f0d63bea [lld][elf2] Fix style. 
llvm-svn: 247064
 2015-09-08 20:36:20 +00:00
Rafael Espindola 740fafe54d Start creating the .dynamic section. 
For now it is always empty.

llvm-svn: 247056
 2015-09-08 19:43:27 +00:00
Rafael Espindola 57b2592ace Don't treat the string table index specially. NFC. 
We assign the string table section an index like every other section, we can
use it from there.

llvm-svn: 247051
 2015-09-08 19:23:30 +00:00
Rafael Espindola b01b57486d Bug fix: Assign output section indexes *after* sorting them. 
llvm-svn: 247037
 2015-09-08 18:08:57 +00:00
Rafael Espindola 5f55387251 Every output section should be added to the OutputSecitons vector. 
Simplify.

llvm-svn: 247032
 2015-09-08 17:39:39 +00:00
Rafael Espindola 18173d420e Start adding support for symbols in shared libraries. 
llvm-svn: 247019
 2015-09-08 15:50:05 +00:00
Rafael Espindola 4f624b9581 Simplify reporting of undefined symbols. 
llvm-svn: 247016
 2015-09-08 14:32:29 +00:00
Rafael Espindola a4dd7c1d38 Revert "[elf2] Add 32S and 64 relocations (needed for musl)." 
This reverts commit r246902. It had uncessary use of yaml.

llvm-svn: 247014
 2015-09-08 13:52:31 +00:00
Michael J. Spencer 1b3fffa6e0 [elf2] Add 32S and 64 relocations (needed for musl). 
It wasn't obvious what the assembly was to generate these relocations, so I did the test with yaml.

llvm-svn: 246902
 2015-09-05 00:36:03 +00:00
Michael J. Spencer baae538cc6 [elf2] Correctly handle sections with an alignment of 0. Spec says to treat it as an alignment of 1. 
llvm-svn: 246901
 2015-09-05 00:25:33 +00:00
Michael J. Spencer f832541066 [elf2] Fix include order. 
llvm-svn: 246892
 2015-09-04 22:48:30 +00:00
Michael J. Spencer 1b348a68e5 [elf2] Add basic archive file support. 
llvm-svn: 246886
 2015-09-04 22:28:10 +00:00
Davide Italiano ad6c81c628 [ELF2] Writer: Fold variables, use setVisibility(). NFCI. 
llvm-svn: 246861
 2015-09-04 19:42:14 +00:00
Rafael Espindola 824d1a975f Add a template helper to avoid multiple switches over the ELF kind. NFC. 
llvm-svn: 246823
 2015-09-04 00:09:43 +00:00
Rafael Espindola 55eed7efcd Avoid gcc warning. 
llvm-svn: 246811
 2015-09-03 22:25:11 +00:00
Davide Italiano 34812ba258 [ELF2] Don't allocate more SymbolBodies than needed. 
Differential Revision:	http://reviews.llvm.org/D12605

llvm-svn: 246802
 2015-09-03 20:25:54 +00:00
Rafael Espindola f98d6d84cd Start adding support for shared libraries. 
This just adds the types and enough support to detect incompatibilities among
shared libraries and object files.

llvm-svn: 246797
 2015-09-03 20:03:54 +00:00
Rafael Espindola 8aeb13fec1 Add a helper function for getting the first object file. 
Also preparation for shared objects. It will become the first ELF file.

llvm-svn: 246796
 2015-09-03 19:13:13 +00:00
Rafael Espindola 222edc66d6 Make ObjectFiles private. NFC. 
Just preparation for adding support for shared libraries.

llvm-svn: 246793
 2015-09-03 18:56:20 +00:00
Rafael Espindola 8788e1a630 Make getSymbols non-virtual. NFC. 
llvm-svn: 246731
 2015-09-02 23:01:37 +00:00
Rafael Espindola 905ad3442d Split out the ELF kind from the InputFile Kind. 
There were at least two issues with having them together:
* For compatibility checks, we only want to look at the ELF kind.
* Adding support for shared libraries should introduce one InputFile kind,
  not 4.

llvm-svn: 246707
 2015-09-02 20:43:43 +00:00
Rafael Espindola 78471f0ec1 Merge visibility from all symbols with the same name. 
The ELF spec says:

... if any reference to or definition of a name is a symbol with a
non-default visibility attribute, the visibility attribute must be
propagated to the resolving symbol in the linked object. If different
visibility attributes are specified for distinct references to or
definitions of a symbol, the most constraining visibility attribute
must be propagated to the resolving symbol in the linked object. The
attributes, ordered from least to most constraining, are:
STV_PROTECTED, STV_HIDDEN and STV_INTERNAL.

llvm-svn: 246603
 2015-09-01 23:12:52 +00:00
Rafael Espindola ee1364f7f6 Don't leave unused strings in the string table. 
llvm-svn: 246593
 2015-09-01 21:47:21 +00:00
Rafael Espindola 5b3942f54a Don't include hidden or internal symbols in the symbol table. 
llvm-svn: 246583
 2015-09-01 20:36:51 +00:00
Rafael Espindola 7f37775e56 Every symbol now has an Elf_Sym. Simplify. NFC. 
llvm-svn: 246581
 2015-09-01 20:30:52 +00:00
Rafael Espindola 06c3a6d676 Start recording st_other (i.e. visibility). 
llvm-svn: 246577
 2015-09-01 19:42:38 +00:00
Rafael Espindola f31f9617ca Remember the maximum alignment used to refer to a common symbol. 
llvm-svn: 246517
 2015-09-01 01:19:12 +00:00
Rafael Espindola b56cb9437f Sort common symbols by alignment. 
llvm-svn: 246511
 2015-09-01 00:16:38 +00:00
Rafael Espindola ce8c9c0548 Set the correct value for the common symbols. 
In the relocatable object it is the alignment, but in the linked file it is
a regular address.

llvm-svn: 246505
 2015-08-31 22:55:21 +00:00
Rafael Espindola 8b09d68447 Assign common symbols to the .bss output section. 
llvm-svn: 246503
 2015-08-31 22:33:21 +00:00
Rafael Espindola 0518574a73 Start allocating space for common symbols. 
llvm-svn: 246496
 2015-08-31 22:07:18 +00:00
Rafael Espindola 058f343246 Don't allocate space for SHT_NOBITS sections. 
llvm-svn: 246480
 2015-08-31 20:23:57 +00:00
Rafael Espindola f7d45f0869 Delete SyntheticUndefined. 
Now that resolved is templated anyway, we can use the regular Undefined.

llvm-svn: 246407
 2015-08-31 01:46:20 +00:00
Rafael Espindola daa92a6193 Keep the largest common symbol. 
This requires templating some functions over ELFT, but that opens other cleanup
opportunities for future patches.

llvm-svn: 246405
 2015-08-31 01:16:19 +00:00
Rafael Espindola 30e1797b38 Turn resolution.s into an exhaustive testcase. 
Now that we print a symbol table and all symbol kinds are at least declared,
we can test all combinations that don't produce an error.

This also includes a few fixes to keep the test passing:

* Keep the strong symbol in a weak X strong pair
* Handle common symbols.

The common X common case will be finished in a followup patch.

llvm-svn: 246401
 2015-08-30 23:17:30 +00:00
Davide Italiano 94f183a696 [ELFv2] Implement R_X86_64_32 relocation. 
Differential Revision:	http://reviews.llvm.org/D12436

llvm-svn: 246362
 2015-08-29 13:15:42 +00:00
Rafael Espindola 51d4690b6e Start adding support for common symbols. 
For now this just recognizes the special section number.

llvm-svn: 246332
 2015-08-28 21:26:51 +00:00
Rafael Espindola 3a63f3fb22 Add support for weak absolute symbols. 
On ELF being weak is independent of what we call the kind of the symbol. So
this also makes the code simpler.

llvm-svn: 246326
 2015-08-28 20:19:34 +00:00
Rafael Espindola 871765c321 Make sure we output symbols in the same order on 32 and 64 bit builds. 
llvm-svn: 246264
 2015-08-28 02:46:41 +00:00
Rafael Espindola f2f41a9f97 Fix the gcc build: 
InputFiles.h:98:53: error: invalid use of incomplete type ‘class lld::elf2::SymbolBody’
     return SymbolBodies[SymbolIndex - FirstNonLocal]->getReplacement();

llvm-svn: 246262
 2015-08-28 02:40:04 +00:00
Michael J. Spencer 67bc8d6b3f [elf2] Add basic relocation support for x86-64. 
This currently doesn't handle local symbols.

Differential Revision: http://reviews.llvm.org/D11612

llvm-svn: 246234
 2015-08-27 23:15:56 +00:00
Rafael Espindola 0e0c1901c9 Start adding support for absolute symbols. 
llvm-svn: 246147
 2015-08-27 12:40:06 +00:00
Rafael Espindola e11c6d2d6f Set the symbol size in the symbol table. 
llvm-svn: 246086
 2015-08-26 21:46:24 +00:00
Rafael Espindola 034e2e7a8e Define types close to use. NFC. 
llvm-svn: 246085
 2015-08-26 21:42:36 +00:00
Rafael Espindola b85b4079f1 git-clang-format the constructor to reduce the diff in a merge. 
llvm-svn: 246076
 2015-08-26 20:46:55 +00:00
Rafael Espindola f3837074cc Set the symbol value in the symbol table. 
llvm-svn: 245943
 2015-08-25 15:53:17 +00:00
Rafael Espindola 5cd113df01 Diagnose symbols with invalid section indexes. 
llvm-svn: 245884
 2015-08-24 22:00:25 +00:00
Rafael Espindola 2034822981 Add support for reading files with more than 0xff00 sections. 
llvm-svn: 245880
 2015-08-24 21:43:25 +00:00
Rafael Espindola 832b93f219 Start recording the section of symbols in the symbol table. 
Support for more than 64 K sections to follow shortly.

llvm-svn: 245868
 2015-08-24 20:06:32 +00:00
Rafael Espindola c5c82916e4 Read the alignment only when used. 
The rest of the header was already read lazily, no point in having align be
special.

llvm-svn: 245863
 2015-08-24 19:28:31 +00:00
Rafael Espindola e6f52102a3 Remove a duplicated member variable. NFC. 
This just makes it clear that, for now, there is only one symbol table.

llvm-svn: 245844
 2015-08-24 14:48:18 +00:00
Rui Ueyama 570752c7ac Do not use unique pointers. NFC. 
These unique pointers have the exact same lifetime as automatic
variables, so use automatic variables instead.

llvm-svn: 245281
 2015-08-18 09:13:25 +00:00
Rafael Espindola 1bd885aba4 ELF: Also record the type of undefined symbols. 
Tested with a weak undefined. Testing with a plain undefined will have to wait
for support for -shared.

llvm-svn: 245069
 2015-08-14 16:46:28 +00:00
Rafael Espindola bd481b8f89 Fix the build with gcc. 
llvm-svn: 245060
 2015-08-14 15:20:34 +00:00
Rafael Espindola c44d17ad45 Add the type of the symbols to the symbol table. 
For now only defined symbols are covered. I will add undefined ones in the
next patch.

llvm-svn: 245057
 2015-08-14 15:10:49 +00:00
Rafael Espindola 457c940835 Delete dead code. 
llvm-svn: 245056
 2015-08-14 14:58:57 +00:00
Rafael Espindola 4c3aa0f228 Delete unused forward declarations. 
llvm-svn: 245055
 2015-08-14 14:51:11 +00:00
Rafael Espindola 3bf356ee9c Remove unused default values. 
llvm-svn: 245053
 2015-08-14 14:38:44 +00:00
Rafael Espindola beee25e484 Make these headers as being c++. 
llvm-svn: 245050
 2015-08-14 14:12:54 +00:00
Rafael Espindola 383c323d4d ELF: Set the correct symbol binding. 
llvm-svn: 245049
 2015-08-14 13:52:36 +00:00
Rafael Espindola 62b81b875a Start populating the symbol table. 
With this patch only the name is set. I will set the other fields shortly.

For now the table doesn't include local symbols. This is equivalent to using
--discard-all with gnu ld. This is OK for now since the symbols are not
needed for execution and for testing symbol resolution we only need the
global symbols.

llvm-svn: 245044
 2015-08-14 13:07:05 +00:00
Rui Ueyama 8050d32b13 ELF2: Rename a function to make it the same as the COFF's counterpart. 
llvm-svn: 245030
 2015-08-14 05:17:30 +00:00
Rafael Espindola f763ca3c9c ELF: Create a symbol table. 
For now it is empty. I will add the symbols in a followup patch.

llvm-svn: 245008
 2015-08-14 02:42:20 +00:00
Rafael Espindola 83b0dc6392 ELF: Drop the Chunk base class. 
With OutputSection being a virtual interface, each concrete OutputSection
handles only one type of chunk and we don't need a base Chunk class.

So for we have a class that handles input sections and one that handles
the string table, but this extends naturally for other outputs (symbol table,
merging of SHF_MERGE sections, etc.).

llvm-svn: 244972
 2015-08-13 22:21:37 +00:00
Rafael Espindola ebd2108215 Make OutputSection virtual and use that for creating the string table. 
We were creating the string table in a completely ad hoc way. Now the
string table is an output section and gets its output offset set just like
any other section.

This opens the way for other linker created sections like the symbol table.

llvm-svn: 244969
 2015-08-13 22:14:37 +00:00
Rafael Espindola 2db634d8f1 Correctly align output sections. 
They don't need to be aligned to page boundaries. Only segments need that.

llvm-svn: 244942
 2015-08-13 20:24:18 +00:00
Rafael Espindola 0160a281c2 Record the alignment of the output sections. 
llvm-svn: 244941
 2015-08-13 20:13:39 +00:00
Rafael Espindola 5d83ccd55b Make getSectionName non virtual. NFC. 
llvm-svn: 244939
 2015-08-13 19:18:30 +00:00
Rafael Espindola ea133eaa39 Delete dead code. 
llvm-svn: 244938
 2015-08-13 19:00:23 +00:00
Rafael Espindola a175eb6ca6 Template OutputSection only over Is64Bit. 
This is a bit more c++ code, but:
* It is less machine code: lld's text is 44688 bytes smaller.
* It should be a bit more efficient in the non native endian case.
* It should be a bit more efficient on architectures with slow unaligned access.

llvm-svn: 244934
 2015-08-13 18:37:23 +00:00
Rafael Espindola 184d94e009 Define trivial methods inline. NFC. 
llvm-svn: 244930
 2015-08-13 18:25:47 +00:00
Rafael Espindola 64e888ba5f Set the file offset of zero sized sections. 
There is no reason not to do it and this matches what gold and bfd ld do.

llvm-svn: 244929
 2015-08-13 18:23:43 +00:00
Rafael Espindola 29e8d343e4 Rename addSectionChunk to addChunk now that it can handle any Chunk. 
llvm-svn: 244919
 2015-08-13 17:35:13 +00:00
Rafael Espindola 375a508234 Pass the type and flags to the OutputSection constructor. NFC. 
This will allow further cleanups.

llvm-svn: 244918
 2015-08-13 17:32:30 +00:00
Rafael Espindola a7471795ae Take name, type and flags in consideration when concatenating sections. 
This is mandated by the ELF spec.

llvm-svn: 244911
 2015-08-13 17:04:50 +00:00
Rafael Espindola 674b5d570f Store the offset in the output section, no in the file. 
That is the value that is stable as the we layout the output sections.

llvm-svn: 244904
 2015-08-13 15:54:36 +00:00
Rafael Espindola ef1ac01c2e Don't give an address to sections that are not allocated. 
llvm-svn: 244900
 2015-08-13 15:31:17 +00:00
Rafael Espindola abad6186c3 Place SHF_ALLOC sections first in the output. 
Having them in the middle of the file complicates the creation of segments.

llvm-svn: 244898
 2015-08-13 15:23:46 +00:00
Rafael Espindola 25f51850a4 Delete dead code. 
llvm-svn: 244896
 2015-08-13 14:48:49 +00:00
Rafael Espindola cde251370a Include non-alloca sections in the link. 
llvm-svn: 244895
 2015-08-13 14:45:44 +00:00
Rafael Espindola bdc8f2fb83 Update for llvm api change. 
llvm-svn: 244849
 2015-08-13 00:31:46 +00:00
Rafael Espindola 372889a8e6 Fix an use of uninitialized. 
Should fix some tests on windows.

llvm-svn: 244834
 2015-08-12 23:25:42 +00:00
Rafael Espindola 91009b3856 Fix the alignment of the section headers. 
Thanks a lot to Rui for noticing it.

llvm-svn: 244711
 2015-08-12 01:45:28 +00:00
Rafael Espindola 6b83b90b6a ELF: Create a string table. 
For now only the sections are in it, but it already makes the output easier
to read and test.

llvm-svn: 244702
 2015-08-12 00:00:24 +00:00
Rui Ueyama 4f89fdad9f ELF2: Make Defined{Regular,Weak} ctors look the same as other SymbolBody ctors. 
llvm-svn: 244701
 2015-08-11 23:37:25 +00:00
Rafael Espindola 021834046f Template ELF's OutputSection. 
This removes what I think is the last hard coded ELF64 structure.

llvm-svn: 244700
 2015-08-11 23:34:29 +00:00
Rafael Espindola 52a0f1e8c6 Move more code that is local to Writer.cpp to an anonymous namespace. 
llvm-svn: 244697
 2015-08-11 23:22:24 +00:00
Rafael Espindola 5211c2a1a0 Delete dead code. 
llvm-svn: 244696
 2015-08-11 23:19:06 +00:00
Rafael Espindola 98f6bd09e4 Be a bit more consistent about using uintX_t for offsets and sizes. NFC. 
llvm-svn: 244694
 2015-08-11 23:14:13 +00:00
Rui Ueyama 880632c458 ELF2: Remove unused global variable. 
A global variable "Driver" is to re-entry to the driver to parse a
.drectve section. Because the need is COFF-specific, we don't need
this variable for ELF.

llvm-svn: 244680
 2015-08-11 21:45:55 +00:00
Reid Kleckner f7b85e0ce2 Fix mismatched sign comparison 
llvm-svn: 244653
 2015-08-11 20:06:51 +00:00
Rafael Espindola 76e24ea955 Add support for weak undefined symbols. 
llvm-svn: 244640
 2015-08-11 17:57:05 +00:00
Rafael Espindola 791e9f9c59 Remove unused templating. 
llvm-svn: 244639
 2015-08-11 17:51:57 +00:00
Rafael Espindola b13df6582a Add support for weak symbols. 
llvm-svn: 244636
 2015-08-11 17:33:02 +00:00
Rafael Espindola ae1b23bd61 Use real values for DefindeFirst and DefinedLast. 
With this clang notices that switches are fully covered.

llvm-svn: 244632
 2015-08-11 17:10:02 +00:00
Rafael Espindola 9247f165ff Delete unused typedef. 
llvm-svn: 244628
 2015-08-11 16:55:28 +00:00
Rafael Espindola 7c388187c9 Don't report a conflict between two local symbols. 
llvm-svn: 244624
 2015-08-11 16:30:34 +00:00
Rafael Espindola d8340dae0c Don't depend on getDotSymtabSec. It is going away. 
llvm-svn: 244451
 2015-08-10 15:12:17 +00:00
Rafael Espindola 1a9344fa26 Use already available symbol tables. NFC. 
llvm-svn: 244336
 2015-08-07 17:16:28 +00:00
Rafael Espindola df1e05a26c Delete broken code. 
This was using a hard coded string table and getting it for every symbol.

The symbol name was already available.

llvm-svn: 244220
 2015-08-06 15:33:21 +00:00
Rafael Espindola 49a2ca6ddd bar 
llvm-svn: 244219
 2015-08-06 15:33:19 +00:00
Rafael Espindola 192e1fa59d Move the error handling functions to Error.h. NFC. 
llvm-svn: 244216
 2015-08-06 15:08:23 +00:00
Rui Ueyama cb8474edae COFF, ELF2: Pass output file path implicitly using Config global variable. 
Various parameters are passed implicitly using Config global variable
already. Output file path is no different from others, so there was no
special reason to handle that differnetly.

This patch changes the signature of writeResult(SymbolTable *, StringRef)
to writeResult(SymbolTable *).

llvm-svn: 244180
 2015-08-05 23:51:50 +00:00
Rui Ueyama afff74e228 ELF2: Simplify Writer interface. 
We are using Writer more like a function instead of a class.
This patch makes it a function to simplify the interface.
All details of Writer class is now hidden from other parts of the linker.

llvm-svn: 244169
 2015-08-05 23:24:46 +00:00
Rafael Espindola 4b7c2fc64e Add bare minimum to get a working i386 linux program. 
llvm-svn: 244050
 2015-08-05 15:08:40 +00:00
Rafael Espindola e7a00e326a For now we only have on Chunk type. Simplify. 
The others we have in sight are
* common symbols.
* entries in SHF_MERGE sections.

They will have a substantially different treatment. It is not clear if it is
worth it putting them all in a single list just to dispatch based on the kind on
the other side.

I hope to implement common symbols soon, and then we will be in a position
to have a concrete discussion. For now this is simpler for the the implemented
features.

llvm-svn: 244042
 2015-08-05 13:55:34 +00:00
Rafael Espindola e3335d8a66 Delete dead code. 
llvm-svn: 244040
 2015-08-05 13:26:54 +00:00
Rafael Espindola 3c9cb4b3d3 lld elf2: Diagnose trying to mix incompatible files. 
This is also a step in instantiating the writer with the correct template
argument.

llvm-svn: 244035
 2015-08-05 12:03:34 +00:00
Rafael Espindola 87ee8dcb64 Use ELFOSABI_NONE. This matches both bfd ld and gold. 
llvm-svn: 244033
 2015-08-05 11:55:52 +00:00
Rafael Espindola aefd5c1617 Create ObjectFile with the correct endian and word size. 
The writer is still hard coded to 64 bits le, but with this we can test for
invalid ELF files.

llvm-svn: 243993
 2015-08-04 15:45:54 +00:00
Rafael Espindola e0a5c09a5c Use make_unique. NFC. 
llvm-svn: 243988
 2015-08-04 15:06:36 +00:00
Rafael Espindola 2ffdd4d0e5 The SymbolTable doesn't need to be a template. 
It was already using just code that is common to all object files.

llvm-svn: 243985
 2015-08-04 14:29:01 +00:00
Rafael Espindola 602592a048 Remove a silly return. 
llvm-svn: 243983
 2015-08-04 14:08:11 +00:00
Rafael Espindola 30318518a5 This function never returns null, don't check it. 
llvm-svn: 243982
 2015-08-04 14:00:56 +00:00
Rafael Espindola b89951457d Remove SymbolTable::getChunks. 
When we were using a std::sort over all the chunks we needed to put them in a
single storage.

Now that we just iterate over them and use a map to find the output section,
we can avoid allocating the temporary storage.

llvm-svn: 243980
 2015-08-04 13:39:30 +00:00
Michael J. Spencer 44fc1c0a73 [ELF2] Templatize addChunk and handle section flags. 
llvm-svn: 243579
 2015-07-29 22:14:50 +00:00
Rui Ueyama b4731a5847 ELF2: Use DenseMap instead of std::map for a symbol table. 
We use DenseMap for COFF too.

llvm-svn: 243534
 2015-07-29 16:30:40 +00:00
Michael J. Spencer 5a6f5f178e [ELF2] Emit correct section types. 
llvm-svn: 243509
 2015-07-29 00:52:17 +00:00
Michael J. Spencer 8039dae26d [ELF2] Emit section table. 
llvm-svn: 243506
 2015-07-29 00:30:10 +00:00
Michael J. Spencer cdae0a4e2d [ELF2] Devirtualize SymbolBody. 
llvm-svn: 243496
 2015-07-28 22:58:25 +00:00
Rui Ueyama e44524de65 Use SmallDenseMap instead of std::map where we don't care about order of keys. 
llvm-svn: 243358
 2015-07-28 00:17:25 +00:00
Rui Ueyama fdbbcdad87 ELF2: Inline very small functions. 
llvm-svn: 243323
 2015-07-27 20:39:04 +00:00
Rui Ueyama a7ccb2926f ELF2: Devirtualize SymbolBody::compare. NFC. 
This is to make it consistent with COFF.

llvm-svn: 243321
 2015-07-27 20:39:01 +00:00
Rui Ueyama 06d7bd2e42 ELF2: Avoid calling std::sort to make output deterministic. 
llvm-svn: 243232
 2015-07-26 00:50:15 +00:00
Rui Ueyama 179cd7b82a ELF2: Remove dead code. 
llvm-svn: 243231
 2015-07-26 00:50:13 +00:00
Michael J. Spencer 84487f1174 [ELF2] Add a new ELF linker based on the new PE/COFF linker. 
Differential Revision: http://reviews.llvm.org/D11188

llvm-svn: 243161
 2015-07-24 21:03:07 +00:00
Michael J. Spencer bae540e945 Revert ELF port. Posting to mailing list. 
llvm-svn: 242118
 2015-07-14 04:49:48 +00:00
Michael J. Spencer 50ed5308d1 Fix warnings. 
llvm-svn: 242098
 2015-07-14 01:02:37 +00:00
Michael J. Spencer f754b1fe12 Put explicit template instantiations in the correct namespace. 
llvm-svn: 242093
 2015-07-14 00:22:00 +00:00
Michael J. Spencer 64661cdb4c Remove commented out code. 
llvm-svn: 242092
 2015-07-14 00:11:38 +00:00
Michael J. Spencer 8a4145411f Initial ELF port. 
This is a direct port of the new PE/COFF linker to ELF.

It can take a single object file and generate a valid executable that executes at the first byte in the text section.

llvm-svn: 242088
 2015-07-13 23:48:06 +00:00