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254 Commits

Author SHA1 Message Date
Daniel Dunbar 0ba6a671d4 MC: Simplify main section layout process by moving alignment into LayoutSection. 
llvm-svn: 99529
 2010-03-25 18:16:42 +00:00
Daniel Dunbar 25d114b2b2 MC: Sink Section address assignment into LayoutSection. 
llvm-svn: 99528
 2010-03-25 18:16:38 +00:00
Daniel Dunbar 4108802628 MC: Explicity track section and fragment ordinals. 
llvm-svn: 99500
 2010-03-25 07:10:11 +00:00
Daniel Dunbar 5b07334c0d MC: Route access to SectionData offset and file size through MCAsmLayout. 
llvm-svn: 99474
 2010-03-25 02:00:07 +00:00
Daniel Dunbar 2522dd1c49 MC: Route access to Fragment offset and effective size through MCAsmLayout. 
llvm-svn: 99473
 2010-03-25 02:00:02 +00:00
Daniel Dunbar 5d98824615 MC: Eliminate MC{Fragment,{Section,Symbol}Data}::getAddress. 
llvm-svn: 99467
 2010-03-25 01:03:24 +00:00
Daniel Dunbar 7c969558d9 MC: Direct all {fragment,section,symbol} address access through the MCAsmLayout object. 
llvm-svn: 99380
 2010-03-24 03:43:40 +00:00
Daniel Dunbar 5376c2a431 MC: Sprinkle in some more interesting statistics. 
llvm-svn: 99350
 2010-03-23 23:47:14 +00:00
Daniel Dunbar de04b3f62c MC: Switch to using MCInst fragments to do relaxation. 
Also, both MCMachOStreamer and MCAssembler are now target independent!

llvm-svn: 99256
 2010-03-23 05:09:03 +00:00
Daniel Dunbar 86face8333 MC: Add TargetAsmBackend::MayNeedRelaxation, for checking whether a particular instruction + fixups might need relaxation. 
llvm-svn: 99249
 2010-03-23 03:13:05 +00:00
Daniel Dunbar a9ae3ae698 MC: Add TargetAsmBackend::WriteNopData and use to eliminate some target dependencies in MCMachOStreamer and MCAssembler. 
llvm-svn: 99248
 2010-03-23 02:36:58 +00:00
Daniel Dunbar 16cbe95dd6 MC: Tweak MCInstFragment to include the encoded data and fixups, so that we don't need to recompute them during relaxation. I will revisit this once all the other pieces of fast relaxation are in place. 
llvm-svn: 99244
 2010-03-23 01:39:05 +00:00
Daniel Dunbar b31c49a70d MC: Add MCInstFragment, not used yet. 
llvm-svn: 99229
 2010-03-22 23:16:48 +00:00
Daniel Dunbar fdc7ccc4e4 MC: Fix a few more cases we were passing an MCDataFragment when a MCFragment would do, and sprinkle in some const. 
llvm-svn: 99218
 2010-03-22 21:49:41 +00:00
Daniel Dunbar 20ea02fde2 Simplify. 
llvm-svn: 99217
 2010-03-22 21:49:38 +00:00
Daniel Dunbar a0ab4bf989 MC: Change MCObjectWriter::RecordRelocation to take an MCFragment (instead of a MCDataFragment). Object files should only need the generic MCFragment features. 
llvm-svn: 99205
 2010-03-22 20:35:50 +00:00
Daniel Dunbar 9213355a91 MC: Eliminate MCFragment::getMaxFileSize. 
llvm-svn: 99203
 2010-03-22 20:35:43 +00:00
Daniel Dunbar 32ffc58ca9 MC: Share the MCAsmLayout object, although its still not used for anything important. 
llvm-svn: 99202
 2010-03-22 20:35:35 +00:00
Daniel Dunbar 4d7c8645fd MC: Add TargetAsmBackend::createObjectWriter. 
- MCAssembler is now object-file independent, although we will surely need more work to fully support ELF/COFF.

llvm-svn: 98955
 2010-03-19 10:43:26 +00:00
Daniel Dunbar eaa367f5ae MCCodeEmitter: Add target independent fixup flag for is-pc-relative. 
llvm-svn: 98954
 2010-03-19 10:43:23 +00:00
Daniel Dunbar 1bd7171c95 MC: Sink code emitter into MCAssembler. 
llvm-svn: 98953
 2010-03-19 10:43:18 +00:00
Daniel Dunbar 79e0e5a631 MC/Mach-O: Move to MachObjectWriter.{h,cpp}. 
llvm-svn: 98952
 2010-03-19 10:43:15 +00:00
Daniel Dunbar c5084cccc8 MC: Add TargetAsmBackend::isVirtualSection hook. 
llvm-svn: 98950
 2010-03-19 09:29:03 +00:00
Daniel Dunbar f027abf7de MC: Split MCObjectWriter out of MCAssembler.cpp. 
llvm-svn: 98949
 2010-03-19 09:28:59 +00:00
Daniel Dunbar 49e5a8ac2a MCAssembler: Pull out MCObjectWriter class. 
llvm-svn: 98948
 2010-03-19 09:28:55 +00:00
Daniel Dunbar f0517efc6c MCAssembler: Move ApplyFixup to the TargetAsmBackend, this is a target specific not object writer specific task. 
llvm-svn: 98947
 2010-03-19 09:28:12 +00:00
Daniel Dunbar 3cab275783 MC/Mach-O: Lift the fixup evaluation and application up (to the same place), and eliminate MCAsmFixup::FixedValue. 
llvm-svn: 98944
 2010-03-19 07:09:47 +00:00
Daniel Dunbar d84d196a86 MC/Mach-O: Factor out ExecutePostLayoutBinding, to separate the post-layout changes the object writer may need to make to the assembler from the actual .o writing. 
llvm-svn: 98943
 2010-03-19 07:09:33 +00:00
Daniel Dunbar 563d40eda6 MC/Mach-O: Lift relocation emission logic a bit higher to separate evaluation / relocation handling from the actual .o writing. 
llvm-svn: 98942
 2010-03-19 07:09:18 +00:00
Daniel Dunbar 0f7fbb3d00 MC/Mach-O: Add isScatteredFixupFullyResolved, which implements the correct algorithm (used on x86_64) for determining whether an evaluated fixup is fully resolved (doesn't need relocation). 
- Test cases will follow, once we have x86_64 relocation support.

llvm-svn: 98926
 2010-03-19 03:18:18 +00:00
Daniel Dunbar 6e13bb07fb MC/Mach-O/x86_64: Add getAtom[ForAddress]. 
- These find the defining symbol which identifies the containing atom for a symbol or address. They are currently very slow, but will be eliminated eventually.

llvm-svn: 98925
 2010-03-19 03:18:15 +00:00
Daniel Dunbar 5ec4bdd1b3 MC/Mach-O: Factor out isScatteredFixupFullyResolvedSimple predicate, and fix some corner cases. 
llvm-svn: 98924
 2010-03-19 03:18:12 +00:00
Daniel Dunbar c558ec211f MC/Mach-O: Factor out isSymbolLinkerVisible method; "linker visible" is a made up term to refer to non-temporary labels + temporary labels in sections-which-require symbols. For Darwin, it corresponds to symbols which effectively define an atom. 
llvm-svn: 98923
 2010-03-19 03:18:09 +00:00
Daniel Dunbar 9c64ec0a7e MCValue: Change to holding MCSymbolRefExprs instead of MCSymbols, we will need this for accessing to symbol modifiers. 
llvm-svn: 98791
 2010-03-18 00:59:10 +00:00
Daniel Dunbar fe8d866fc7 MC/Mach-O/x86_64: Temporary labels in cstring sections require symbols (and external relocations, but we don't have x86_64 relocations yet). 
llvm-svn: 98583
 2010-03-15 21:56:50 +00:00
Daniel Dunbar 232dc953ac MC/Mach-O: Add MCSectionMachO::getType() 
llvm-svn: 98582
 2010-03-15 21:56:38 +00:00
Daniel Dunbar 7c1f3d8cad MC/X86_64: Symbol support. 
llvm-svn: 98456
 2010-03-13 22:49:35 +00:00
Daniel Dunbar 56597588f0 MC/Mach-O: Initial x86_64 support. 
llvm-svn: 98454
 2010-03-13 22:10:17 +00:00
Daniel Dunbar 34b8e553ea MC/Mach-O: PCrel relocations weren't using the right base address, they are 
relative to the fragment address, not its offset. This was masked by the text
section normally being at address 0.

llvm-svn: 98420
 2010-03-13 02:38:00 +00:00
Daniel Dunbar 12f1e32d59 MC/Mach-O: Implement initial support for relaxation. 
- The implementation is currently very brain dead and inefficient, but I have a
   clear plan on how to fix it.

 - The good news is, it works and correctly assembles 403.gcc (when built with
   Clang, at '-Os', '-Os -g', and '-O3'). Even better, at '-Os' and '-Os -g',
   the resulting binary is exactly equivalent to that when built with the system
   assembler. So it probably works! :)

llvm-svn: 98396
 2010-03-12 22:07:14 +00:00
Daniel Dunbar ea9e2f8a15 MC: Factor out MCAssembler::EvaluateFixup, and simplify. 
llvm-svn: 98381
 2010-03-12 21:00:49 +00:00
Daniel Dunbar 64b408b124 MC/Mach-O: Add MCSymbolData::getAddress() utility. 
llvm-svn: 98266
 2010-03-11 18:22:51 +00:00
Daniel Dunbar 5c5228a8f6 MC/Mach-O: Implement "absolutizing" semantics of .set, by evaluating the assembly time value of variables. 
llvm-svn: 98241
 2010-03-11 05:53:37 +00:00
Daniel Dunbar cf55f96214 MC/Mach-O: Start passing in the basic MCAsmLayout object. 
- Also, drop the current location part of AsmLayout, I think I prefer to implement this via explicit symbols.

llvm-svn: 98240
 2010-03-11 05:53:33 +00:00
Daniel Dunbar c5ddbad237 MC: Provide MCAssembler with a TargetAsmBackend. 
llvm-svn: 98222
 2010-03-11 01:34:27 +00:00
Daniel Dunbar dc765e9f03 MC/Mach-O: Use the MCAssembler symbol map instead of reconstructing. 
llvm-svn: 98187
 2010-03-10 20:58:31 +00:00
Daniel Dunbar 46ed804180 MC/Mach-O: Resolve a FIXME; these relocation types are no longer semanticaly different. 
llvm-svn: 98120
 2010-03-10 02:10:29 +00:00
Daniel Dunbar 27b984ac85 MC/Mach-O: Use the SECTDIFF relocation type for (A - B + constant) where A is external. 
- I'm not sure why, but this is what 'as' does.

llvm-svn: 98115
 2010-03-10 00:58:25 +00:00
Daniel Dunbar 3dde457b94 MC/Mach-O: For PCrel relocations, we need to compensate for the PCrel adjustment when determining if we need a scattered relocation. 
llvm-svn: 98082
 2010-03-09 21:27:58 +00:00
Daniel Dunbar d49794e703 MC/Mach-O: Also set the PCrel bit in the second half of paired relocation entries. 
llvm-svn: 98081
 2010-03-09 21:27:47 +00:00
Daniel Dunbar 4680000b27 MC/Mach-O: Don't generate relocations for PCrel fixups to local labels. 
llvm-svn: 98080
 2010-03-09 21:27:30 +00:00
Daniel Dunbar cb01210eca MC/Mach-O: Tweak .dump() formatting. 
llvm-svn: 98028
 2010-03-09 01:12:23 +00:00
Daniel Dunbar 97d64717c4 MC/Mach-O: Don't adjust section sizes when aligning zero fill sections, just pad the address. 
llvm-svn: 98027
 2010-03-09 01:12:20 +00:00
Daniel Dunbar 3a3f472cb4 MC/Macho-O: Align the zerofill section itself to the maximum alignment. 
llvm-svn: 97991
 2010-03-08 22:03:42 +00:00
Daniel Dunbar 6622fe7873 MC/Mach-O: Fix address compution for zero fill sections. 
llvm-svn: 97984
 2010-03-08 21:10:42 +00:00
Daniel Dunbar c6ac7940d9 MC/Mach-O: Error out instead of crashing on invalid scattered relocation expressions. 
llvm-svn: 97983
 2010-03-08 21:10:39 +00:00
Kevin Enderby c26ddccf38 This is the second patch to allow x86 code to be aligned with optimal nops. 
With the compiler changed to use EmitCodeAlignment() it does change the
functionality.  But X86 assembly code assembled with llvm-mc does not change
its output.  For that we will eventually change the assembler frontend to
detect a '.align x, 0x90' when used in a section that 'hasInstructions' and use
EmitCodeAlignment, but will wait until we have better target hooks.

llvm-svn: 96988
 2010-02-23 21:41:24 +00:00
Kevin Enderby e83d74f626 This is the first patch to put the needed bits in place to eventually allow code 
to be aligned with optimal nops.  This patch does not change any functionality
and when the compiler is changed to use EmitCodeAlignment() it should also not
change the resulting output.  Once the compiler change is made and everything
looks good the next patch with the table of optimal X86 nops will be added to
WriteNopData() changing the output.  There are many FIXMEs in this patch which
will be removed when we have better target hooks (coming soon I hear).

llvm-svn: 96963
 2010-02-23 18:26:34 +00:00
Daniel Dunbar 1d7179ad63 MC/Mach-O: Update fixup values for change to X86 offsets. 
llvm-svn: 96532
 2010-02-17 23:45:16 +00:00
Duncan Sands fe562b6598 Pacify gcc-4.5, which warns (correctly) that these switches have 
cases that are not part of the enum.

llvm-svn: 96477
 2010-02-17 14:52:22 +00:00
Daniel Dunbar 8408c126c1 MCAssembler: Fix pcrel relocations. Oh and, 
--
ddunbar@ozzy:tmp$ clang -m32 -integrated-as hello.c && ./a.out
hello world!
--

llvm-svn: 96096
 2010-02-13 09:45:59 +00:00
Daniel Dunbar 1e2fad3de8 MC/Mach-O: Start emitting fixups/relocations for instructions. 
llvm-svn: 96095
 2010-02-13 09:29:02 +00:00
Daniel Dunbar 3374835b46 MCAssembler: Switch MCAsmFixup to storing MCFixupKind instead of just a size. 
llvm-svn: 96094
 2010-02-13 09:28:54 +00:00
Daniel Dunbar 97867a9cfc MCAssembler: Sink fixup list into MCDataFragment. 
llvm-svn: 96093
 2010-02-13 09:28:43 +00:00
Daniel Dunbar 056bc60336 MCAssembler: Switch MCFillFragment to only taking constant values. Symbolic expressions can always be emitted as data + fixups. 
llvm-svn: 96092
 2010-02-13 09:28:32 +00:00
Daniel Dunbar 8e53203154 MCAssembler: Start applying fixups in the data section. 
llvm-svn: 96090
 2010-02-13 09:28:15 +00:00
Daniel Dunbar bedf1d4a41 MCAssembler: Add assorted dump() methods. 
llvm-svn: 96089
 2010-02-13 09:28:03 +00:00
Daniel Dunbar 1d34759721 MC: Move assembler-backend's fixup list into the fragment. 
llvm-svn: 95926
 2010-02-11 21:29:46 +00:00
Daniel Dunbar ee82e763e6 MC: Move MCSectionData::Fixup out to MCAsmFixup. 
llvm-svn: 95925
 2010-02-11 21:29:29 +00:00
Daniel Dunbar 9a0a46163d llvm-mc: Add --show-fixups option, for displaying the instruction fixup information in the asm comments. 
llvm-svn: 95710
 2010-02-09 23:00:14 +00:00
Daniel Dunbar 255a8c8b13 MC/Mach-O: Set SOME_INSTRUCTIONS bit for sections. 
llvm-svn: 95135
 2010-02-02 21:44:01 +00:00
Chris Lattner 809ae81ff9 Add a new top-level MachO.h file for manifest constants, fixing 
a layering violation from MC -> Target.

llvm-svn: 95113
 2010-02-02 19:38:14 +00:00
Nate Begeman e945172ba4 Remove this fixme, looking at the linker source, all targets pad to 4 bytes. 
llvm-svn: 93835
 2010-01-19 01:32:44 +00:00
Daniel Dunbar ad36e8aceb Pass StringRef by value. 
llvm-svn: 86251
 2009-11-06 10:58:06 +00:00
Daniel Dunbar e024def785 Minor formatting tweaks. 
llvm-svn: 84235
 2009-10-16 01:58:15 +00:00
Daniel Dunbar 8e6d889d4c MC: Switch assembler API to using MCExpr instead of MCValue. 
llvm-svn: 84234
 2009-10-16 01:58:03 +00:00
Daniel Dunbar 4fa0595b94 llvm-mc: Store MCSymbolData value as a pointer (to make MSVC happy). 
llvm-svn: 80652
 2009-09-01 04:09:03 +00:00
Daniel Dunbar 945e257e99 llvm-mc: Make MCSymbolData symbol member const. 
llvm-svn: 80573
 2009-08-31 08:08:06 +00:00
Daniel Dunbar 02c7254f6d llvm-mc: Add MCContext to MCAssembler. 
llvm-svn: 80572
 2009-08-31 08:07:55 +00:00
Daniel Dunbar 2701eee0ad llvm-mc: Support .comm emission. 
llvm-svn: 80351
 2009-08-28 07:08:35 +00:00
Daniel Dunbar 42a39d038a llvm-mc: Support .zerofill emission. 
- I'm still trying to figure out the cleanest way to implement this and match the assembler, currently there are some substantial differences.

llvm-svn: 80347
 2009-08-28 05:49:21 +00:00
Daniel Dunbar a468a12dfa llvm-mc: Tweak section alignment and size computation to match 'as' closer. 
llvm-svn: 80345
 2009-08-28 05:49:04 +00:00
Daniel Dunbar 93665faad0 llvm-mc: Fix thinko in emitting values. 
llvm-svn: 80340
 2009-08-28 05:48:10 +00:00
Daniel Dunbar 47f11ac5b5 Try to make MSVC just a little happier. 
llvm-svn: 80187
 2009-08-27 00:38:04 +00:00
Daniel Dunbar e73b267301 llvm-mc/Mach-O: Don't put assembler temporary labels in the symbol table. 
- I moved section creation back into AsmParser. I think policy decisions like
   this should be pushed higher, not lower, when possible (in addition the
   assembler has flags which change this behavior, for example).

llvm-svn: 80162
 2009-08-26 22:13:22 +00:00
Daniel Dunbar e2697738a4 llvm-mc/Mach-O: Set .subsections_via_symbols flag properly. 
llvm-svn: 80144
 2009-08-26 21:22:22 +00:00
Daniel Dunbar c4581eaca8 llvm-mc/Mach-O: Add support for relocations. 
- I haven't really tried to find the "right" way to store the fixups or apply
   them, yet. This works, but isn't particularly elegant or fast.

 - Still no evaluation support, so we don't actually ever not turn a fixup into
   a relocation entry.

llvm-svn: 80089
 2009-08-26 13:58:10 +00:00
Daniel Dunbar a9eeb78ed5 llvm-mc/Mach-O: Move symbol indices into the MCSymbolData structure. 
llvm-svn: 80088
 2009-08-26 13:57:54 +00:00
Daniel Dunbar 066d0f93bf llvm-mc/Mach-O: Add section padding where needed (to align the next section). 
Also, simplify some of Mach-O writer code which can now use section addresses.

llvm-svn: 80067
 2009-08-26 04:13:32 +00:00
Daniel Dunbar aef5317edd llvm-mc/Mach-O: Set addresses for symbols. 
llvm-svn: 80065
 2009-08-26 02:48:04 +00:00
Daniel Dunbar c2c0bf961f llvm-mc: Improve indirect symbol support (add the indirect index table). 
llvm-svn: 80059
 2009-08-26 00:18:21 +00:00
Daniel Dunbar 5a07d6a9c6 llvm-mc: Add statistic for number of fragments emitted by the assembler. 
llvm-svn: 80033
 2009-08-25 21:10:45 +00:00
Daniel Dunbar 582d61026d llvm-mc/Mach-O: Preliminary support for indirect symbols. 
- The indirect table itself isn't being filled in yet.

 - This isn't factored properly and is rather FIXMEd, but at the moment I'm more
   focused on figuring out what it needs to do.

llvm-svn: 79910
 2009-08-24 11:56:58 +00:00
Daniel Dunbar 04a1158d13 llvm-mc/Mach-O: Support symbol attributes. 
- This is mostly complete, the main thing missing is .indirect_symbol support
   (which would be straight-forward, except that the way it is implemented in
   'as' makes getting an exact .o match interesting).

llvm-svn: 79899
 2009-08-24 08:40:12 +00:00
Daniel Dunbar d341e781da llvm-mc: Tweak undefined symbol handling. 
llvm-svn: 79898
 2009-08-24 08:39:57 +00:00
Chris Lattner 06fa176862 prune the #includes in raw_ostream.h by moving a 
member out of line. ftostr is not particularly speedy,
so that method is presumably not perf sensitive.

llvm-svn: 79885
 2009-08-24 03:52:50 +00:00
Chris Lattner 8f816e7d68 tweak #includes 
llvm-svn: 79744
 2009-08-22 19:19:12 +00:00
Daniel Dunbar d1859474a7 llvm-mc/Mach-O: Improve symbol table support: 
- Honor .globl.

 - Set symbol type and section correctly ('nm' now works), and order symbols
   appropriately.

 - Take care to the string table so that the .o matches 'as' exactly (for ease
   of testing).

llvm-svn: 79740
 2009-08-22 11:41:10 +00:00
Daniel Dunbar ff3eafd39d llvm-mc/Mach-O: Sketch symbol table support. 
- The only .s syntax this honors right now is emitting labels, and some parts
   of the symbol table generation are wrong or faked.

 - This is enough to get nm to report such symbols... incorrectly, but still.

Also, fixed byte emission to extend the previous fragment if possible.

llvm-svn: 79739
 2009-08-22 10:13:24 +00:00
Daniel Dunbar 38728fe481 llvm-mc/Mach-O: Move more logic for writing the Mach-O file into the writer 
class, and kill off MCSectionData::FileOffset.

llvm-svn: 79735
 2009-08-22 08:28:27 +00:00
Daniel Dunbar fef19ffe3a llvm-mc: Rename / redefine MCFragment::FileOffset to MCFragment::Offset (the 
section offset).

llvm-svn: 79734
 2009-08-22 08:27:54 +00:00
Daniel Dunbar b1068e4fe3 llvm-mc/Mach-O: Support .o emission for .org and .align. 
llvm-svn: 79684
 2009-08-21 23:07:38 +00:00
Daniel Dunbar 4ef7fb9530 llvm-mc/Mach-O: Support byte and fill value emission. 
llvm-svn: 79652
 2009-08-21 18:29:01 +00:00
Daniel Dunbar 3016db39dd llvm-mc: Start MCAssembler and MCMachOStreamer. 
- Together these form the (Mach-O) back end of the assembler.

 - MCAssembler is the actual assembler backend, which is designed to have a
   reasonable API. This will eventually grow to support multiple object file
   implementations, but for now its Mach-O/i386 only.

 - MCMachOStreamer adapts the MCStreamer "actions" API to the MCAssembler API,
   e.g. converting the various directives into fragments, managing state like
   the current section, and so on.

 - llvm-mc will use the new backend via '-filetype=obj', which may eventually
   be, but is not yet, since I hear that people like assemblers which actually
   assemble.

 - The only thing that works at the moment is changing sections. For the time
   being I have a Python Mach-O dumping tool in test/scripts so this stuff can
   be easily tested, eventually I expect to replace this with a real LLVM tool.

 - More doxyments to come.

I assume that since this stuff doesn't touch any of the things which are part of
2.6 that it is ok to put this in not so long before the freeze, but if someone
objects let me know, I can pull it.

llvm-svn: 79612
 2009-08-21 09:11:24 +00:00