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llvm-project/llvm/lib/MC
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Rafael Espindola 54b435ec3c Add r224985 back with a fix. 
The issues was that AArch64 has additional restrictions on when local
relocations can be used. We have to take those into consideration when
deciding to put a L symbol in the symbol table or not.

Original message:

Remove doesSectionRequireSymbols.

In an assembly expression like

bar:
.long L0 + 1

the intended semantics is that bar will contain a pointer one byte past L0.

In sections that are merged by content (strings, 4 byte constants, etc), a
single position in the section doesn't give the linker enough information.
For example, it would not be able to tell a relocation must point to the
end of a string, since that would look just like the start of the next.

The solution used in ELF to use relocation with symbols if there is a non-zero
addend.

In MachO before this patch we would just keep all symbols in some sections.

This would miss some cases (only cstrings on x86_64 were implemented) and was
inefficient since most relocations have an addend of 0 and can be represented
without the symbol.

This patch implements the non-zero addend logic for MachO too.

llvm-svn: 225048
 		2014-12-31 17:19:34 +00:00
..
MCDisassembler Fix a regression on the disassembling C API. 2014-11-13 16:52:07 +00:00
MCParser MC: Label definitions are permitted after .set directives 2014-12-24 10:27:50 +00:00
CMakeLists.txt Nuke MCAnalysis. 2014-09-02 22:32:20 +00:00
ConstantPools.cpp Fix build failure on windows 2014-07-18 16:41:58 +00:00
ELFObjectWriter.cpp Add r224985 back with a fix. 2014-12-31 17:19:34 +00:00
LLVMBuild.txt Nuke MCAnalysis. 2014-09-02 22:32:20 +00:00
MCAsmBackend.cpp Simplify a really complicated check for Arch == X86_64. 2014-03-11 21:22:57 +00:00
MCAsmInfo.cpp Refactor duplicated code. 2014-12-29 15:18:31 +00:00
MCAsmInfoCOFF.cpp Remove HasLEB128. 2014-08-15 14:01:07 +00:00
MCAsmInfoDarwin.cpp Add r224985 back with a fix. 2014-12-31 17:19:34 +00:00
MCAsmInfoELF.cpp Allow target to specify prefix for labels 2014-12-04 00:06:57 +00:00
MCAsmStreamer.cpp DebugInfo: Omit is_stmt from line table entries on the same line. 2014-12-30 22:47:13 +00:00
MCAssembler.cpp Add r224985 back with a fix. 2014-12-31 17:19:34 +00:00
MCCodeEmitter.cpp
…
MCCodeGenInfo.cpp
…
MCContext.cpp Remove StringMap::GetOrCreateValue in favor of StringMap::insert 2014-11-19 05:49:42 +00:00
MCDwarf.cpp Remove StringMap::GetOrCreateValue in favor of StringMap::insert 2014-11-19 05:49:42 +00:00
MCELF.cpp [MC] Constify MCELF::GetVisibility and MCELF::getOther 2014-07-11 17:34:44 +00:00
MCELFObjectTargetWriter.cpp [MC] Pass MCSymbolData to needsRelocateWithSymbol 2014-07-20 23:15:06 +00:00
MCELFStreamer.cpp Add back commits r219835 and a fixed version of r219829. 2014-10-17 01:48:58 +00:00
MCExpr.cpp Instead of explicitely comparing both lowercase and uppercase variants. 2014-12-18 23:12:34 +00:00
MCInst.cpp [C++11] More 'nullptr' conversion or in some cases just using a boolean check instead of comparing to nullptr. 2014-04-13 04:57:38 +00:00
MCInstPrinter.cpp [MC] When MCInstPrint::printAnnotation uses a comment stream, it has to ensure 2013-10-01 19:21:24 +00:00
MCInstrAnalysis.cpp MC: Disassembled CFG reconstruction. 2013-05-24 01:07:04 +00:00
MCLabel.cpp
…
MCLinkerOptimizationHint.cpp [ARM64][CollectLOH] Add some comments to explain how the LOHs 2014-04-02 01:02:28 +00:00
MCMachOStreamer.cpp Add and update reset() and doInitialization() methods to MC* and passes. 2014-09-17 09:25:36 +00:00
MCMachObjectTargetWriter.cpp
…
MCNullStreamer.cpp Remove method that is identical to the base class one. 2014-10-14 17:38:38 +00:00
MCObjectFileInfo.cpp Commit back the correct bits of r222760 (was r222538). 2014-11-27 17:13:56 +00:00
MCObjectStreamer.cpp Clean up static analyzer warnings. 2014-12-12 21:48:03 +00:00
MCObjectWriter.cpp
…
MCRegisterInfo.cpp Make SubRegIndex size mandatory, following r183020. 2013-05-31 23:45:26 +00:00
MCSection.cpp
…
MCSectionCOFF.cpp MC: Fix MCSectionCOFF::PrintSwitchToSection 2014-09-20 20:40:50 +00:00
MCSectionELF.cpp delete function name from comment 2014-10-09 21:23:39 +00:00
MCSectionMachO.cpp [C++11] More 'nullptr' conversion or in some cases just using a boolean check instead of comparing to nullptr. 2014-04-13 04:57:38 +00:00
MCStreamer.cpp Revert r221150, as it broke sanitizer tests 2014-11-03 12:19:03 +00:00
MCSubtargetInfo.cpp Change MCSchedModel to be a struct of statically initialized data. 2014-09-02 17:43:54 +00:00
MCSymbol.cpp Revert "Add back r203962, r204028 and r204059." 2014-03-19 00:13:43 +00:00
MCSymbolizer.cpp Move MCSymbolizer's constructor into header. It's trivial - there's no need for 2014-03-27 02:42:52 +00:00
MCTargetOptions.cpp Convert MC command line option for fatal assembler warnings into a 2014-08-26 18:39:50 +00:00
MCValue.cpp Fix pr19645. 2014-05-03 19:57:04 +00:00
MCWin64EH.cpp MC Win64: Put unwind info for COMDAT code into the same COMDAT group 2014-09-04 17:42:03 +00:00
MCWinEH.cpp Fix Windows unwind info for functions in sections other than .text 2014-12-22 22:10:08 +00:00
MachObjectWriter.cpp Add r224985 back with a fix. 2014-12-31 17:19:34 +00:00
Makefile Nuke MCAnalysis. 2014-09-02 22:32:20 +00:00
StringTableBuilder.cpp MachObjectWriter: optimize the string table for common suffices 2014-10-06 17:05:19 +00:00
SubtargetFeature.cpp Fix some cases where StringRef was being passed by const reference. Remove const from some other StringRefs since its implicitly const already. 2014-08-30 16:48:02 +00:00
WinCOFFObjectWriter.cpp Add r224985 back with a fix. 2014-12-31 17:19:34 +00:00
WinCOFFStreamer.cpp MC, COFF: Use relocations for function references inside the section 2014-11-11 08:43:57 +00:00
YAML.cpp Invert the MC -> Object dependency. 2014-07-03 02:01:39 +00:00