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5609 Commits

Author SHA1 Message Date
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