d821f4ac60
llvm-mc: Add a -mc-relax-all option, which relaxes every fixup. We always need
...
exactly two passes in that case, and don't ever need to recompute any layout,
so this is a nice baseline for relaxation performance.
llvm-svn: 99563
2010-03-25 22:49:09 +00:00
6432bd744e
MC: Stop restarting layout on every relaxation.
...
- Still O(N^2), just a faster form, and now its the MCAsmLayout's fault.
On the .s I am tuning against (combine.s from 403.gcc):
--
ddunbar@lordcrumb:MC$ diff stats-before.txt stats-after.txt
5,10c5,10
< 1728 assembler - Number of assembler layout and relaxation steps
< 7707 assembler - Number of emitted assembler fragments
< 120588 assembler - Number of emitted object file bytes
< 2233448 assembler - Number of evaluated fixups
< 1727 assembler - Number of relaxed instructions
< 6723845 mcexpr - Number of MCExpr evaluations
---
> 3 assembler - Number of assembler layout and relaxation steps
> 7707 assembler - Number of emitted assembler fragments
> 120588 assembler - Number of emitted object file bytes
> 14796 assembler - Number of evaluated fixups
> 1727 assembler - Number of relaxed instructions
> 67889 mcexpr - Number of MCExpr evaluations
--
Feel free to LOL at the -before numbers, if you like.
I am a little surprised we make more than 2 relaxation passes. It's pretty
trivial for us to do relaxation out-of-order if that would give a speedup.
llvm-svn: 99543
2010-03-25 19:35:56 +00:00
0ba6a671d4
MC: Simplify main section layout process by moving alignment into LayoutSection.
...
llvm-svn: 99529
2010-03-25 18:16:42 +00:00
25d114b2b2
MC: Sink Section address assignment into LayoutSection.
...
llvm-svn: 99528
2010-03-25 18:16:38 +00:00
4108802628
MC: Explicity track section and fragment ordinals.
...
llvm-svn: 99500
2010-03-25 07:10:11 +00:00
5b07334c0d
MC: Route access to SectionData offset and file size through MCAsmLayout.
...
llvm-svn: 99474
2010-03-25 02:00:07 +00:00
2522dd1c49
MC: Route access to Fragment offset and effective size through MCAsmLayout.
...
llvm-svn: 99473
2010-03-25 02:00:02 +00:00
5d98824615
MC: Eliminate MC{Fragment,{Section,Symbol}Data}::getAddress.
...
llvm-svn: 99467
2010-03-25 01:03:24 +00:00
7c969558d9
MC: Direct all {fragment,section,symbol} address access through the MCAsmLayout object.
...
llvm-svn: 99380
2010-03-24 03:43:40 +00:00
5376c2a431
MC: Sprinkle in some more interesting statistics.
...
llvm-svn: 99350
2010-03-23 23:47:14 +00:00
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
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
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
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
b31c49a70d
MC: Add MCInstFragment, not used yet.
...
llvm-svn: 99229
2010-03-22 23:16:48 +00:00
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
20ea02fde2
Simplify.
...
llvm-svn: 99217
2010-03-22 21:49:38 +00:00
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
9213355a91
MC: Eliminate MCFragment::getMaxFileSize.
...
llvm-svn: 99203
2010-03-22 20:35:43 +00:00
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
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
eaa367f5ae
MCCodeEmitter: Add target independent fixup flag for is-pc-relative.
...
llvm-svn: 98954
2010-03-19 10:43:23 +00:00
1bd7171c95
MC: Sink code emitter into MCAssembler.
...
llvm-svn: 98953
2010-03-19 10:43:18 +00:00
79e0e5a631
MC/Mach-O: Move to MachObjectWriter.{h,cpp}.
...
llvm-svn: 98952
2010-03-19 10:43:15 +00:00
c5084cccc8
MC: Add TargetAsmBackend::isVirtualSection hook.
...
llvm-svn: 98950
2010-03-19 09:29:03 +00:00
f027abf7de
MC: Split MCObjectWriter out of MCAssembler.cpp.
...
llvm-svn: 98949
2010-03-19 09:28:59 +00:00
49e5a8ac2a
MCAssembler: Pull out MCObjectWriter class.
...
llvm-svn: 98948
2010-03-19 09:28:55 +00:00
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
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
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
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
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
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
5ec4bdd1b3
MC/Mach-O: Factor out isScatteredFixupFullyResolvedSimple predicate, and fix some corner cases.
...
llvm-svn: 98924
2010-03-19 03:18:12 +00:00
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
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
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
232dc953ac
MC/Mach-O: Add MCSectionMachO::getType()
...
llvm-svn: 98582
2010-03-15 21:56:38 +00:00
7c1f3d8cad
MC/X86_64: Symbol support.
...
llvm-svn: 98456
2010-03-13 22:49:35 +00:00
56597588f0
MC/Mach-O: Initial x86_64 support.
...
llvm-svn: 98454
2010-03-13 22:10:17 +00:00
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
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
ea9e2f8a15
MC: Factor out MCAssembler::EvaluateFixup, and simplify.
...
llvm-svn: 98381
2010-03-12 21:00:49 +00:00
64b408b124
MC/Mach-O: Add MCSymbolData::getAddress() utility.
...
llvm-svn: 98266
2010-03-11 18:22:51 +00:00
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
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
c5ddbad237
MC: Provide MCAssembler with a TargetAsmBackend.
...
llvm-svn: 98222
2010-03-11 01:34:27 +00:00
dc765e9f03
MC/Mach-O: Use the MCAssembler symbol map instead of reconstructing.
...
llvm-svn: 98187
2010-03-10 20:58:31 +00:00
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
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
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
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
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
cb01210eca
MC/Mach-O: Tweak .dump() formatting.
...
llvm-svn: 98028
2010-03-09 01:12:23 +00:00
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
3a3f472cb4
MC/Macho-O: Align the zerofill section itself to the maximum alignment.
...
llvm-svn: 97991
2010-03-08 22:03:42 +00:00
6622fe7873
MC/Mach-O: Fix address compution for zero fill sections.
...
llvm-svn: 97984
2010-03-08 21:10:42 +00:00
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
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
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
1d7179ad63
MC/Mach-O: Update fixup values for change to X86 offsets.
...
llvm-svn: 96532
2010-02-17 23:45:16 +00:00
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
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
1e2fad3de8
MC/Mach-O: Start emitting fixups/relocations for instructions.
...
llvm-svn: 96095
2010-02-13 09:29:02 +00:00
3374835b46
MCAssembler: Switch MCAsmFixup to storing MCFixupKind instead of just a size.
...
llvm-svn: 96094
2010-02-13 09:28:54 +00:00
97867a9cfc
MCAssembler: Sink fixup list into MCDataFragment.
...
llvm-svn: 96093
2010-02-13 09:28:43 +00:00
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
8e53203154
MCAssembler: Start applying fixups in the data section.
...
llvm-svn: 96090
2010-02-13 09:28:15 +00:00
bedf1d4a41
MCAssembler: Add assorted dump() methods.
...
llvm-svn: 96089
2010-02-13 09:28:03 +00:00
1d34759721
MC: Move assembler-backend's fixup list into the fragment.
...
llvm-svn: 95926
2010-02-11 21:29:46 +00:00
ee82e763e6
MC: Move MCSectionData::Fixup out to MCAsmFixup.
...
llvm-svn: 95925
2010-02-11 21:29:29 +00:00
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
255a8c8b13
MC/Mach-O: Set SOME_INSTRUCTIONS bit for sections.
...
llvm-svn: 95135
2010-02-02 21:44:01 +00:00
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
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
ad36e8aceb
Pass StringRef by value.
...
llvm-svn: 86251
2009-11-06 10:58:06 +00:00
e024def785
Minor formatting tweaks.
...
llvm-svn: 84235
2009-10-16 01:58:15 +00:00
8e6d889d4c
MC: Switch assembler API to using MCExpr instead of MCValue.
...
llvm-svn: 84234
2009-10-16 01:58:03 +00:00
4fa0595b94
llvm-mc: Store MCSymbolData value as a pointer (to make MSVC happy).
...
llvm-svn: 80652
2009-09-01 04:09:03 +00:00
945e257e99
llvm-mc: Make MCSymbolData symbol member const.
...
llvm-svn: 80573
2009-08-31 08:08:06 +00:00
02c7254f6d
llvm-mc: Add MCContext to MCAssembler.
...
llvm-svn: 80572
2009-08-31 08:07:55 +00:00
2701eee0ad
llvm-mc: Support .comm emission.
...
llvm-svn: 80351
2009-08-28 07:08:35 +00:00
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
a468a12dfa
llvm-mc: Tweak section alignment and size computation to match 'as' closer.
...
llvm-svn: 80345
2009-08-28 05:49:04 +00:00
93665faad0
llvm-mc: Fix thinko in emitting values.
...
llvm-svn: 80340
2009-08-28 05:48:10 +00:00
47f11ac5b5
Try to make MSVC just a little happier.
...
llvm-svn: 80187
2009-08-27 00:38:04 +00:00
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
e2697738a4
llvm-mc/Mach-O: Set .subsections_via_symbols flag properly.
...
llvm-svn: 80144
2009-08-26 21:22:22 +00:00
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
a9eeb78ed5
llvm-mc/Mach-O: Move symbol indices into the MCSymbolData structure.
...
llvm-svn: 80088
2009-08-26 13:57:54 +00:00
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
aef5317edd
llvm-mc/Mach-O: Set addresses for symbols.
...
llvm-svn: 80065
2009-08-26 02:48:04 +00:00
c2c0bf961f
llvm-mc: Improve indirect symbol support (add the indirect index table).
...
llvm-svn: 80059
2009-08-26 00:18:21 +00:00
5a07d6a9c6
llvm-mc: Add statistic for number of fragments emitted by the assembler.
...
llvm-svn: 80033
2009-08-25 21:10:45 +00:00
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
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
d341e781da
llvm-mc: Tweak undefined symbol handling.
...
llvm-svn: 79898
2009-08-24 08:39:57 +00:00
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
8f816e7d68
tweak #includes
...
llvm-svn: 79744
2009-08-22 19:19:12 +00:00
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
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
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
fef19ffe3a
llvm-mc: Rename / redefine MCFragment::FileOffset to MCFragment::Offset (the
...
section offset).
llvm-svn: 79734
2009-08-22 08:27:54 +00:00
b1068e4fe3
llvm-mc/Mach-O: Support .o emission for .org and .align.
...
llvm-svn: 79684
2009-08-21 23:07:38 +00:00
4ef7fb9530
llvm-mc/Mach-O: Support byte and fill value emission.
...
llvm-svn: 79652
2009-08-21 18:29:01 +00:00
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
Daniel Dunbar