llvm-6502/lib/MC
Rafael Espindola a23cc6a1ea Add r224985 back with fixes.
The fixes are to note that AArch64 has additional restrictions on when local
relocations can be used. In particular, ld64 requires that relocations to
cstring/cfstrings use linker visible symbols.

Original message:

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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@226503 91177308-0d34-0410-b5e6-96231b3b80d8
2015-01-19 21:11:14 +00:00
..
MCDisassembler unique_ptrify the RelInfo parameter to TargetRegistry::createMCSymbolizer 2015-01-18 20:45:48 +00:00
MCParser Replace size method call of containers to empty method where appropriate 2015-01-15 11:41:30 +00:00
CMakeLists.txt
ConstantPools.cpp [cleanup] Re-sort all the #include lines in LLVM using 2015-01-14 11:23:27 +00:00
ELFObjectWriter.cpp Add r224985 back with fixes. 2015-01-19 21:11:14 +00:00
LLVMBuild.txt
MachObjectWriter.cpp Add r224985 back with fixes. 2015-01-19 21:11:14 +00:00
Makefile
MCAsmBackend.cpp
MCAsmInfo.cpp
MCAsmInfoCOFF.cpp
MCAsmInfoDarwin.cpp Add r224985 back with fixes. 2015-01-19 21:11:14 +00:00
MCAsmInfoELF.cpp
MCAsmStreamer.cpp [cleanup] Re-sort all the #include lines in LLVM using 2015-01-14 11:23:27 +00:00
MCAssembler.cpp Add r224985 back with fixes. 2015-01-19 21:11:14 +00:00
MCCodeEmitter.cpp
MCCodeGenInfo.cpp
MCContext.cpp
MCDwarf.cpp
MCELF.cpp
MCELFObjectTargetWriter.cpp
MCELFStreamer.cpp
MCExpr.cpp
MCInst.cpp
MCInstPrinter.cpp
MCInstrAnalysis.cpp
MCLabel.cpp
MCLinkerOptimizationHint.cpp [cleanup] Re-sort all the #include lines in LLVM using 2015-01-14 11:23:27 +00:00
MCMachObjectTargetWriter.cpp
MCMachOStreamer.cpp Replace size method call of containers to empty method where appropriate 2015-01-15 11:41:30 +00:00
MCNullStreamer.cpp
MCObjectFileInfo.cpp
MCObjectStreamer.cpp
MCObjectWriter.cpp
MCRegisterInfo.cpp
MCSection.cpp
MCSectionCOFF.cpp
MCSectionELF.cpp
MCSectionMachO.cpp
MCStreamer.cpp
MCSubtargetInfo.cpp
MCSymbol.cpp
MCSymbolizer.cpp
MCTargetOptions.cpp Migrate ABIName to MCTargetOptions so that it can be shared between 2015-01-14 00:50:31 +00:00
MCValue.cpp
MCWin64EH.cpp
MCWinEH.cpp
StringTableBuilder.cpp
SubtargetFeature.cpp
WinCOFFObjectWriter.cpp Add r224985 back with fixes. 2015-01-19 21:11:14 +00:00
WinCOFFStreamer.cpp [cleanup] Re-sort all the #include lines in LLVM using 2015-01-14 11:23:27 +00:00
YAML.cpp