Reed Kotler 2c3a4641a7 This patch is needed to make c++ exceptions work for mips16. ... Mips16 is really a processor decoding mode (ala thumb 1) and in the same program, mips16 and mips32 functions can exist and can call each other. If a jal type instruction encounters an address with the lower bit set, then the processor switches to mips16 mode (if it is not already in it). If the lower bit is not set, then it switches to mips32 mode. The linker knows which functions are mips16 and which are mips32. When relocation is performed on code labels, this lower order bit is set if the code label is a mips16 code label. In general this works just fine, however when creating exception handling tables and dwarf, there are cases where you don't want this lower order bit added in. This has been traditionally distinguished in gas assembly source by using a different syntax for the label. lab1: ; this will cause the lower order bit to be added lab2=. ; this will not cause the lower order bit to be added In some cases, it does not matter because in dwarf and debug tables the difference of two labels is used and in that case the lower order bits subtract each other out. To fix this, I have added to mcstreamer the notion of a debuglabel. The default is for label and debug label to be the same. So calling EmitLabel and EmitDebugLabel produce the same result. For various reasons, there is only one set of labels that needs to be modified for the mips exceptions to work. These are the "$eh_func_beginXXX" labels. Mips overrides the debug label suffix from ":" to "=." . This initial patch fixes exceptions. More changes most likely will be needed to DwarfCFException to make all of this work for actual debugging. These changes will be to emit debug labels in some places where a simple label is emitted now. Some historical discussion on this from gcc can be found at: http://gcc.gnu.org/ml/gcc-patches/2008-08/msg00623.html http://gcc.gnu.org/ml/gcc-patches/2008-11/msg01273.html git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@170279 91177308-0d34-0410-b5e6-96231b3b80d8		2012-12-16 04:00:45 +00:00
..
MCDisassembler	Add C API for specifying CPU to the disassembler.	2012-12-07 23:53:27 +00:00
MCParser	[ms-inline asm] Make sure we fail gracefully on parse errors. Parse errors	2012-12-12 22:45:52 +00:00
CMakeLists.txt	Give MCRegisterInfo an implementation file.	2012-07-27 16:25:20 +00:00
ELFObjectWriter.cpp	Make the contents of encoded sections SmallVector<char, N> instead of	2012-12-07 22:06:56 +00:00
LLVMBuild.txt	LLVMBuild: Introduce a common section which currently has a list of the	2011-12-12 22:45:54 +00:00
MachObjectWriter.cpp	Add more reset methods to make all objects that the backend may use for outputting code have a reset, some are not used but were declared for completeness	2012-12-14 18:52:11 +00:00
Makefile
MCAsmBackend.cpp	MachO: direct-to-object attribute for data-in-code markers.	2012-10-01 22:20:54 +00:00
MCAsmInfo.cpp	This patch is needed to make c++ exceptions work for mips16.	2012-12-16 04:00:45 +00:00
MCAsmInfoCOFF.cpp	Fix alignment of .comm and .lcomm on mingw32.	2012-09-07 21:08:01 +00:00
MCAsmInfoDarwin.cpp	Fix alignment of .comm and .lcomm on mingw32.	2012-09-07 21:08:01 +00:00
MCAsmStreamer.cpp	This patch is needed to make c++ exceptions work for mips16.	2012-12-16 04:00:45 +00:00
MCAssembler.cpp	Add more reset methods to make all objects that the backend may use for outputting code have a reset, some are not used but were declared for completeness	2012-12-14 18:52:11 +00:00
MCAtom.cpp
MCCodeEmitter.cpp
MCCodeGenInfo.cpp	Sink codegen optimization level into MCCodeGenInfo along side relocation model	2011-11-16 08:38:26 +00:00
MCContext.cpp	Make the MCStreamer have a reset method and call that after finalization of the asm printer,	2012-12-12 22:59:46 +00:00
MCDisassembler.cpp
MCDwarf.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
MCELF.cpp	Added Mapping Symbols for ARM ELF	2012-12-07 16:50:23 +00:00
MCELFObjectTargetWriter.cpp	Initial TOC support for PowerPC64 object creation	2012-10-25 12:27:42 +00:00
MCELFStreamer.cpp	This patch is needed to make c++ exceptions work for mips16.	2012-12-16 04:00:45 +00:00
MCExpr.cpp	This patch improves the 64-bit PowerPC InitialExec TLS support by providing	2012-12-14 17:02:38 +00:00
MCInst.cpp	Release build: guard dump functions with	2012-09-12 05:06:18 +00:00
MCInstPrinter.cpp	Try to unbreak the build on hosts that don't transitively pull in a definition for int64_t.	2012-12-05 18:31:11 +00:00
MCInstrAnalysis.cpp
MCLabel.cpp	Release build: guard dump functions with	2012-09-12 05:06:18 +00:00
MCMachObjectTargetWriter.cpp
MCMachOStreamer.cpp	This patch is needed to make c++ exceptions work for mips16.	2012-12-16 04:00:45 +00:00
MCModule.cpp
MCNullStreamer.cpp	This patch is needed to make c++ exceptions work for mips16.	2012-12-16 04:00:45 +00:00
MCObjectFileInfo.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
MCObjectStreamer.cpp	This patch is needed to make c++ exceptions work for mips16.	2012-12-16 04:00:45 +00:00
MCObjectWriter.cpp	Move [SU]LEB128 encoding to a utility header.	2012-08-08 23:56:06 +00:00
MCPureStreamer.cpp	This patch is needed to make c++ exceptions work for mips16.	2012-12-16 04:00:45 +00:00
MCRegisterInfo.cpp	Add MCRI::getNumSubRegIndices() and start checking SubRegIndex ranges.	2012-09-11 16:34:02 +00:00
MCSection.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
MCSectionCOFF.cpp	Tidy up. Trailing whitespace.	2012-05-11 01:41:30 +00:00
MCSectionELF.cpp	Tidy up. Trailing whitespace.	2012-05-11 01:41:30 +00:00
MCSectionMachO.cpp
MCStreamer.cpp	This patch is needed to make c++ exceptions work for mips16.	2012-12-16 04:00:45 +00:00
MCSubtargetInfo.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
MCSymbol.cpp	Fix Doxygen issues:	2012-09-14 14:57:36 +00:00
MCTargetAsmLexer.cpp
MCValue.cpp	Release build: guard dump functions with	2012-09-12 05:06:18 +00:00
MCWin64EH.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
SubtargetFeature.cpp	Symbol hygiene: Make sure declarations and definitions match, make helper functions static.	2012-10-20 12:53:26 +00:00
WinCOFFObjectWriter.cpp	Use the new script to sort the includes of every file under lib.	2012-12-03 16:50:05 +00:00
WinCOFFStreamer.cpp	This patch is needed to make c++ exceptions work for mips16.	2012-12-16 04:00:45 +00:00