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57 Commits

Author SHA1 Message Date
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
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
f3837074cc Set the symbol value in the symbol table. 
llvm-svn: 245943
 2015-08-25 15:53:17 +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
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
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
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
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
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
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
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
87ee8dcb64 Use ELFOSABI_NONE. This matches both bfd ld and gold. 
llvm-svn: 244033
 2015-08-05 11:55:52 +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
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