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320 Commits

Author SHA1 Message Date
Daniel Dunbar fe0c28f4db MC: Simplify Mach-O and ELF object writer implementations. 
- What was I thinking?????

llvm-svn: 118992
 2010-11-13 07:33:40 +00:00
Benjamin Kramer dcc7732f88 MCELF: Copy the symbol name only if we're going to modify it. 
llvm-svn: 118920
 2010-11-12 19:26:04 +00:00
Rafael Espindola a3e9a2298d Initial comdat implementation. 
llvm-svn: 118805
 2010-11-11 18:13:52 +00:00
Rafael Espindola fb6540c112 Make AliasedSymbol able to handle MCTargetExpr. They can get here if 
a weakref is used with a VariantKind.

llvm-svn: 118798
 2010-11-11 17:24:43 +00:00
Rafael Espindola fa7b55754c Fix the symbol index of weak references. Also make RecordRelocation a bit 
easier to read by having const references to the symbol, aliased symbol and
renamed symbol.

llvm-svn: 118793
 2010-11-11 16:48:11 +00:00
Rafael Espindola 19fa38000a Remove some explicit arguments to getELFSection. This is 
a leftover from the removal of isExplicit.

llvm-svn: 118774
 2010-11-11 03:40:25 +00:00
Rafael Espindola 5a8d781caa Factor some code into WriteSection. 
llvm-svn: 118733
 2010-11-10 23:36:59 +00:00
Rafael Espindola eb97f59753 Update the section index map after we add the medatada sections. 
llvm-svn: 118728
 2010-11-10 22:34:07 +00:00
Rafael Espindola 1801410fa8 Use SectionIndexMap in WriteSymbolTable to make it a little less brittle. 
llvm-svn: 118725
 2010-11-10 22:16:43 +00:00
Rafael Espindola d634003ebd Factor some code into ComputeIndexMap. 
llvm-svn: 118722
 2010-11-10 21:51:05 +00:00
Rafael Espindola 51d68339a2 Change the String<size> methods to take a fragment instead of a buffer. 
llvm-svn: 118709
 2010-11-10 20:02:59 +00:00
Rafael Espindola 36ef57d2eb Use MCSectionELF in places we know we have an ELF section. 
llvm-svn: 118699
 2010-11-10 19:05:07 +00:00
Rafael Espindola 9bb44a5ce8 Fixed version of 118639 with an extra assert to catch similar problems 
earlier. Implicit bool -> int conversions are evil!

llvm-svn: 118651
 2010-11-09 23:42:07 +00:00
Rafael Espindola 33048f069f Revert previous patch. Missed a case. 
llvm-svn: 118645
 2010-11-09 22:54:38 +00:00
Rafael Espindola 4bdd2724e3 Remove IsExplicit. It was always false. 
llvm-svn: 118639
 2010-11-09 22:37:44 +00:00
Rafael Espindola 1614597873 Implement .weakref. 
llvm-svn: 117911
 2010-11-01 14:28:48 +00:00
Rafael Espindola 3fe87a1eed Add support for files with more than 65280 sections. No testcase since 
it would be a bit too big :-)

llvm-svn: 117849
 2010-10-31 00:16:26 +00:00
Rafael Espindola 45834a0065 Be more strict on when we produce an undefined reference. In gas a file with 
just

.type   foo,@object

will produce an undefined reference to foo. On the other hand, a file with
just

.weakref bar, foo

will not. It is somewhat hard to support both in MC since both statements
should create the symbols. It should be possible if we really need to by
adding to the flags, but hopefully that is not necessary.

With this patch we do not produce a undefined reference in any of those cases.
The assembly file needs an actual use for the undefined reference to be
present.

This is in preparation for a patch implementing .weakref.

llvm-svn: 117735
 2010-10-29 23:09:31 +00:00
Rafael Espindola 3c5a54e4b9 Defined weak symbols should have non-zero value. 
llvm-svn: 117585
 2010-10-28 19:39:57 +00:00
Rafael Espindola 29f70afbae Fix relocations with renamed symbols. 
llvm-svn: 117575
 2010-10-28 19:08:03 +00:00
Rafael Espindola 6cd76e63f8 Aliases defined with .symver should copy the binding of the symbols they alias. 
Move the existing patching for undefined symbols so that all the patching
is done in the same function.

llvm-svn: 117570
 2010-10-28 18:33:03 +00:00
Rafael Espindola 936ba3af28 Implement R_X86_64_DTPOFF32. 
llvm-svn: 117548
 2010-10-28 15:11:03 +00:00
Rafael Espindola 2dbec3f762 Implement TLSLD. 
llvm-svn: 117547
 2010-10-28 15:02:40 +00:00
Rafael Espindola e8f08be11c Implement DTPOFF. 
llvm-svn: 117546
 2010-10-28 14:48:59 +00:00
Rafael Espindola 6f23eb380d Implement TLSLDM. 
llvm-svn: 117544
 2010-10-28 14:37:09 +00:00
Rafael Espindola b3b49bbc39 Implement VK_GOTNTPOFF and switch RelocNeedsGOT to use VariantKind. 
llvm-svn: 117543
 2010-10-28 14:22:44 +00:00
Rafael Espindola f8537165bd Add support for R_386_TLS_GD, R_386_TLS_LE_32, R_386_TLS_IE and R_386_TLS_LE. 
llvm-svn: 117494
 2010-10-27 21:23:52 +00:00
Rafael Espindola 24c8b04d5f Implement R_X86_64_GOTTPOFF, R_X86_64_TLSGD and R_X86_64_TPOFF32. 
llvm-svn: 117481
 2010-10-27 20:28:07 +00:00
Benjamin Kramer 14807270be Replace pointer arithmetic with StringRef::substr. 
llvm-svn: 117477
 2010-10-27 19:53:52 +00:00
Rafael Espindola 26496e6835 Produce an error for an invalid use of .symver. 
llvm-svn: 117462
 2010-10-27 17:56:18 +00:00
Rafael Espindola cc1b168ef6 Symbols defined as the difference of other two end up in the ABS section. 
llvm-svn: 117451
 2010-10-27 16:04:30 +00:00
Rafael Espindola eb0c2c170d Add support for the .symver directive. This is really ugly, but most of it is 
contained in the ELF object writer.

llvm-svn: 117448
 2010-10-27 15:18:17 +00:00
Rafael Espindola a5efd6a27c Move more logic to isInSymtab and simplify. 
llvm-svn: 117447
 2010-10-27 14:44:52 +00:00
Rafael Espindola 0ed1543d4e Add support for emitting ARM file attributes. 
llvm-svn: 117275
 2010-10-25 17:50:35 +00:00
Rafael Espindola 800fd3533c Add X86::reloc_global_offset_table and use it to have a single place where 
we check for _GLOBAL_OFFSET_TABLE_.

llvm-svn: 117241
 2010-10-24 17:35:42 +00:00
Wesley Peck 1851090515 Making the e_machine configurable by the target backend in ELFObjectWriter. 
llvm-svn: 117099
 2010-10-22 15:52:49 +00:00
Rafael Espindola ee8d15157a Small cleanups and fixes in preparation for fixing _GLOBAL_OFFSET_TABLE_. 
llvm-svn: 116848
 2010-10-19 19:31:37 +00:00
Rafael Espindola fba9f74932 Implement R_386_GOT32. 
llvm-svn: 116744
 2010-10-18 20:47:21 +00:00
Rafael Espindola 0a5314fdb3 Relocate with .bss instead of using the symbol. Matches gas behavior. 
llvm-svn: 116741
 2010-10-18 20:25:33 +00:00
Rafael Espindola 3604d4441a Reenable assert. 
llvm-svn: 116738
 2010-10-18 19:33:01 +00:00
Rafael Espindola e3dc9e2ea1 Produce ELF::R_386_GOTPC relocations. 
llvm-svn: 116728
 2010-10-18 18:36:12 +00:00
Rafael Espindola 257374bb0f Make the bots happy. 
llvm-svn: 116719
 2010-10-18 18:03:28 +00:00
Rafael Espindola 3521f8467d Produce a R_386_PLT32 when needed. Moved the default cases of switches to the 
start for consistency.

llvm-svn: 116715
 2010-10-18 16:58:03 +00:00
Rafael Espindola 4464e0858f Handle GOTOFF correctly on i386. 
llvm-svn: 116711
 2010-10-18 16:38:04 +00:00
Benjamin Kramer 77414757f6 Fix a typo and silence unused variable warnings in -Asserts build. 
llvm-svn: 116685
 2010-10-17 07:38:40 +00:00
Rafael Espindola 4262a22225 Add a MCObjectFormat class so that code common to all targets that use a 
single object format can be shared.

This also adds support for

mov zed+(bar-foo), %eax

on ELF and COFF targets.

llvm-svn: 116675
 2010-10-16 18:23:53 +00:00
Rafael Espindola 84378f0f53 Refactor alias handling to AliasedSymbol. 
llvm-svn: 116600
 2010-10-15 18:25:33 +00:00
Rafael Espindola fbcf0db7ee Refactor code a bit and avoid creating unnecessary entries in the string 
map.

llvm-svn: 116579
 2010-10-15 15:39:06 +00:00
Rafael Espindola bee6e9f8e0 Remove some code duplication. 
llvm-svn: 116484
 2010-10-14 16:34:44 +00:00
Rafael Espindola 883936ce0b Another case of 256 sections not being enough :-) 
llvm-svn: 115858
 2010-10-06 22:28:19 +00:00
Rafael Espindola 5f2d6a5cd9 Get binding and visibility info from the the alias, but Type from the symbol 
being aliased.

llvm-svn: 115836
 2010-10-06 21:02:29 +00:00
Rafael Espindola d444577382 If a symbol is global, reloc against it even if it is in a mergeable section. 
llvm-svn: 115817
 2010-10-06 19:27:21 +00:00
Rafael Espindola 83b2a3337f Make sure weak symbols are listed after the local ones. 
llvm-svn: 115795
 2010-10-06 16:47:31 +00:00
Rafael Espindola 8f3d2c9058 Correctly handle GOTPCREL relocations. 
llvm-svn: 115793
 2010-10-06 16:23:36 +00:00
Rafael Espindola d7565c3a06 Use a relocation against the symbol if it is a PLT and the symbol is in another 
section. Common because of linkonce sections.

llvm-svn: 115718
 2010-10-05 23:57:26 +00:00
Rafael Espindola 0ad137e98e Implement more alias cases. 
llvm-svn: 115699
 2010-10-05 22:26:43 +00:00
Rafael Espindola 3844da781f 256 sections should be enough for anyone... 
llvm-svn: 115687
 2010-10-05 21:20:07 +00:00
Rafael Espindola c58a37ea51 Don't crash in a strange .size directive. 
llvm-svn: 115684
 2010-10-05 21:02:45 +00:00
Rafael Espindola b1d0789357 Implement a simple alias case and refactor the code a bit so that the 
isInSymtab and isLocal logic in the two loops don't get easily out of sync.

llvm-svn: 115643
 2010-10-05 18:01:23 +00:00
Rafael Espindola d03e81dba8 Produce a undefined reference to _GLOBAL_OFFSET_TABLE_ when needed. 
llvm-svn: 115623
 2010-10-05 15:48:37 +00:00
Rafael Espindola bce26a1ee0 On ELF we need to know which symbols are used in relocations to decide if 
they should be in the symbol table or not. Instead of "guessing", just compute
the symbol table after the relocations are known.

llvm-svn: 115619
 2010-10-05 15:11:03 +00:00
Rafael Espindola fd1fff8b19 Implement ELF::R_X86_64_GOTPCREL. 
llvm-svn: 115547
 2010-10-04 19:51:39 +00:00
Rafael Espindola 308363336b Move isFixupKindX86PCRel. 
llvm-svn: 115545
 2010-10-04 19:46:28 +00:00
Rafael Espindola baadbd554a Produce a R_X86_64_PLT32 when needed. 
llvm-svn: 115541
 2010-10-04 19:04:13 +00:00
Rafael Espindola b2c4ca6433 Produce a R_X86_64_GOT32 when needed. 
llvm-svn: 115537
 2010-10-04 18:44:25 +00:00
Rafael Espindola da0e3d07b2 Include the section address in the computation of the relocation. 
llvm-svn: 115509
 2010-10-04 15:59:01 +00:00
Rafael Espindola 7c48b06930 Correctly compute the relocation when it is not in the first fragment. 
llvm-svn: 115506
 2010-10-04 15:28:43 +00:00
Rafael Espindola f70b4e0c2e Implement a very basic PIC case. 
llvm-svn: 115454
 2010-10-03 00:46:57 +00:00
Rafael Espindola f987d5ea1c Factor some logic into ShouldRelocOnSymbol. This simplifies the code and 
fixes some cases where we were producing relocations with at symbol that
should use a section instead.

llvm-svn: 115194
 2010-09-30 20:18:35 +00:00
Rafael Espindola 70d6e0e0ff Correctly produce R_X86_64_32 or R_X86_64_32S. 
With this patch in

movq    $foo, foo(%rip)
foo:
.long   foo

We produce a R_X86_64_32S for the first relocation and R_X86_64_32 for the
second one.

llvm-svn: 115134
 2010-09-30 03:11:42 +00:00
Rafael Espindola 2ebaee9c75 Make it possible for the MCObjectWriter to decide if a given fixup is fully 
resolved or not. Different object files have different restrictions and
different native assemblers have different idiosyncrasies we want to emulate
for now.

Move the existing MachO logic to the new place and implement an ELF one that
gets fixups to globals right.

llvm-svn: 115131
 2010-09-30 02:22:20 +00:00
Rafael Espindola 01d20a76fe On elf, undefined symbols can start with .L. 
llvm-svn: 114958
 2010-09-28 16:19:11 +00:00
Rafael Espindola 96bfb50c03 Write relocations in the end of the file. This matches what gas does and 
makes files easier to diff.

llvm-svn: 114898
 2010-09-27 22:04:54 +00:00
Rafael Espindola 9735f4ff8d Factor symbol value computation into a function. 
llvm-svn: 114891
 2010-09-27 21:23:02 +00:00
Rafael Espindola 75d65b9a03 Move ELF to HasReliableSymbolDifference=true. Also take the opportunity to put 
symbols defined in merge sections in independent atoms.

llvm-svn: 114786
 2010-09-25 05:42:19 +00:00
Rafael Espindola cf1f985838 Reapply 114678 and 114667. Reverting them did not fix the bot: 
http://google1.osuosl.org:8011/builders/llvm-gcc-i386-linux-selfhost/builds/69

llvm-svn: 114761
 2010-09-24 21:19:03 +00:00
Rafael Espindola 3843bb9d2c Revert 114678 and 114667 to see if 
http://google1.osuosl.org:8011/builders/llvm-gcc-i386-linux-selfhost

gets happy.

llvm-svn: 114742
 2010-09-24 18:48:08 +00:00
Rafael Espindola f458f04eb1 Correctly handle weak undefined symbols. Before we would get a invalid binding 
(2 == STB_WEAK | STB_GLOBAL).

llvm-svn: 114690
 2010-09-23 19:55:14 +00:00
Rafael Espindola 6366d1b858 Correctly compute the offset of the symbol. Forgot these bits from the 
last commit.

llvm-svn: 114678
 2010-09-23 18:01:31 +00:00
Rafael Espindola 48e108753b Represent relocations against local symbols as relocations against the section 
they are in. Both ways should be equivalent, but gas produces relocations
against the section.

Roman wrote the patch, I added the test.

llvm-svn: 114667
 2010-09-23 17:25:18 +00:00
Rafael Espindola 2816588eb9 Fix the FIXME. 
llvm-svn: 114639
 2010-09-23 14:14:56 +00:00
Rafael Espindola 0e527b7ed5 Fix typo and add a FIXME. 
llvm-svn: 114570
 2010-09-22 19:04:41 +00:00
Rafael Espindola 461a692c7f Revert unrelated change that was accidentally included in the previous commit. 
llvm-svn: 114383
 2010-09-21 00:40:19 +00:00
Rafael Espindola f0591c1642 Implement support for .local and its "interesting" interactions with .comm. 
llvm-svn: 114382
 2010-09-21 00:24:38 +00:00
Rafael Espindola 32ab4558fe Produce a R_X86_64_32 when the value is >=0. 
llvm-svn: 114339
 2010-09-20 19:20:47 +00:00
Rafael Espindola 57e599a82a Make sure the STT_FILE symbol is the first one in the symbol table. 
llvm-svn: 114285
 2010-09-18 15:03:21 +00:00
Rafael Espindola 0ecde03e9f Avoid relocations in a common case. 
llvm-svn: 114229
 2010-09-17 22:34:41 +00:00
Rafael Espindola 44bf266111 Print the address of sections as 0 and create the metadata sections in the 
same order as gnu as.

llvm-svn: 114109
 2010-09-16 19:46:31 +00:00
Benjamin Kramer 6c3c349b2b MCELF: Write relocation fragments in the right endian. 
- This code is gross, but does the job for now.

llvm-svn: 113509
 2010-09-09 18:01:29 +00:00
Roman Divacky 3b727f55aa Make ELF OS ABI dependent on the OS from target triple. 
llvm-svn: 113508
 2010-09-09 17:57:50 +00:00
Roman Divacky 2ef1a589c5 ELF_STB_Local is 0 so setting and checking it must be done specially 
llvm-svn: 113375
 2010-09-08 18:08:40 +00:00
Roman Divacky 6c27de28b5 Unresolved weak symbols have value equal zero. 
llvm-svn: 113358
 2010-09-08 14:29:45 +00:00
Benjamin Kramer 3723ba1fe0 MCELF: Align symtab, relocation sections and section headers properly. Patch by Krister Wombell. 
llvm-svn: 113155
 2010-09-06 16:11:52 +00:00
Benjamin Kramer 4226198a1d Allow creation of SHT_NULL sections, from Roman Divacky. 
llvm-svn: 112605
 2010-08-31 17:03:33 +00:00
Benjamin Kramer b1b493bcab MCELF: The value of all common symbols is the offset from the start of the section. Patch by Roman Divacky. 
llvm-svn: 112492
 2010-08-30 17:20:17 +00:00
Benjamin Kramer 8199447851 The value is offset from the start of the section for non-common symbols, submitted by Jordan Gordeev. 
llvm-svn: 112473
 2010-08-30 12:00:16 +00:00
Benjamin Kramer f791b9fc56 Index external symbols by symbol table instead of parent section, by Roman Divacky. 
llvm-svn: 112472
 2010-08-30 11:59:29 +00:00
Chris Lattner 95bb297c26 squish dead code. 
llvm-svn: 112350
 2010-08-28 03:21:03 +00:00
Benjamin Kramer 05e22982c8 MCELF: Always overwrite FixedValue. 
llvm-svn: 112259
 2010-08-27 10:38:39 +00:00
Benjamin Kramer 2c45f431fa MCELF: Fix a thinko of mine. 
llvm-svn: 112203
 2010-08-26 18:12:04 +00:00
Benjamin Kramer 929cc7618f MCELF: Compensate for the addend on i386. Patch by Roman Divacky, with some cleanups. 
llvm-svn: 112197
 2010-08-26 17:23:02 +00:00
Benjamin Kramer 37b384cd66 MCELF: Use precomputed symbol indices, patch by Roman Divacky. 
llvm-svn: 112079
 2010-08-25 20:09:43 +00:00
Benjamin Kramer a536f077fe Relocate against parent if the symbol is not in section or it's a common symbol, from Roman Divacky. 
llvm-svn: 111925
 2010-08-24 17:34:39 +00:00
Benjamin Kramer d41b53c037 Fix thinko. Having no tests is great ... 
llvm-svn: 111848
 2010-08-23 21:32:00 +00:00
Benjamin Kramer c4809c930a Reduce code duplication. 
llvm-svn: 111846
 2010-08-23 21:23:52 +00:00
Benjamin Kramer 86511dce18 ELFObjectWriter: Run ComputeSymbolTable before recording relocations. This way we can use the information it has computed and don't have to recompute the same stuff over and over again. 
llvm-svn: 111844
 2010-08-23 21:19:37 +00:00
Benjamin Kramer 40f83489b4 Add the symbol offset to the relocation value when we relocate against section. By Roman Divacky. 
llvm-svn: 111824
 2010-08-23 19:05:46 +00:00
Benjamin Kramer 620b68e883 Use the proper relocation section + cleanup, from Roman Divacky. 
llvm-svn: 111819
 2010-08-23 18:24:20 +00:00
Benjamin Kramer 448886d5df MCELF: Count the section orders properly. Patch by Roman Divacky. 
llvm-svn: 111517
 2010-08-19 13:44:49 +00:00
Benjamin Kramer da7604f53d Remove dead code. Fixes a GCC warning. 
llvm-svn: 111271
 2010-08-17 19:45:05 +00:00
Benjamin Kramer 1afba421a9 Sketch i386 relocations handling, from Roman Divacky. 
Hello world builds & runs now on i386/ELF with -integrated-as.

llvm-svn: 111264
 2010-08-17 18:20:28 +00:00
Benjamin Kramer fd0541566b Use the correct entry size for relocation entries, from Roman Divacky. 
llvm-svn: 111259
 2010-08-17 17:56:13 +00:00
Benjamin Kramer 1fe76565d0 Differentiate between RELA and REL relocations, from Roman Divacky. 
llvm-svn: 111252
 2010-08-17 17:30:07 +00:00
Benjamin Kramer 896bd7e932 One baby step towards i386 ELF, from Roman Divacky. 
llvm-svn: 111247
 2010-08-17 17:02:29 +00:00
Benjamin Kramer b962ca0ce5 Try to silence a overeager GCC warning. 
llvm-svn: 111214
 2010-08-17 00:33:24 +00:00
Benjamin Kramer 5f237942f5 A round of minor cleanups for ELFObjectWriter. 
llvm-svn: 111213
 2010-08-17 00:00:46 +00:00
Benjamin Kramer be6cca2b7d Silence warnings and simplify code. Eliminate a 32/64 bit portability issue. 
llvm-svn: 111201
 2010-08-16 23:00:12 +00:00
Eli Friedman 1fe0d53aec Fixes for generation of ELF relocations. Patch by Roman Divacky. 
llvm-svn: 111183
 2010-08-16 21:17:09 +00:00
Eli Friedman b20b5249d2 Fix a few warnings in and detabify MCELFStreamer and ELFObjectWriter. 
llvm-svn: 111175
 2010-08-16 19:15:06 +00:00
Matt Fleming 6c1ad4835e Add ELF ObjectWriter and Streamer support. 
I forgot to add these files in commit 111172.

llvm-svn: 111174
 2010-08-16 18:57:57 +00:00