llvm-6502/lib/Target/PowerPC/MCTargetDesc
Rafael Espindola 8093abb745 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.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@225048 91177308-0d34-0410-b5e6-96231b3b80d8
2014-12-31 17:19:34 +00:00
..
CMakeLists.txt [CMake] Let add_public_tablegen_target responsible to provide dependency to CommonTableGen. 2013-11-28 17:04:04 +00:00
LLVMBuild.txt
Makefile
PPCAsmBackend.cpp [PowerPC] ELFv2 MC support for .localentry directive 2014-07-20 23:06:03 +00:00
PPCELFObjectWriter.cpp Add support for small-model PIC for PowerPC. 2014-11-12 15:16:30 +00:00
PPCFixupKinds.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
PPCMachObjectWriter.cpp Add r224985 back with a fix. 2014-12-31 17:19:34 +00:00
PPCMCAsmInfo.cpp Target triple OS detection tidyup. NFC 2014-11-29 19:18:21 +00:00
PPCMCAsmInfo.h Refactor duplicated code. 2014-12-29 15:18:31 +00:00
PPCMCCodeEmitter.cpp Add support for SPE load/store from memory. 2014-08-08 16:43:49 +00:00
PPCMCExpr.cpp @l and friends adjust their value depending the context used in. 2014-08-10 12:41:50 +00:00
PPCMCExpr.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
PPCMCTargetDesc.cpp [PowerPC] Fix PR 21652 - copy st_other bits on symbol assignment 2014-11-24 18:09:47 +00:00
PPCMCTargetDesc.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00
PPCPredicates.cpp Add CR-bit tracking to the PowerPC backend for i1 values 2014-02-28 00:27:01 +00:00
PPCPredicates.h Canonicalize header guards into a common format. 2014-08-13 16:26:38 +00:00