David Peixotto 1edc33b924 ARM integrated assembler generates incorrect nop opcode ... This patch fixes a bug in the assembler that was causing bad code to be emitted. When switching modes in an assembly file (e.g. arm to thumb mode) we would always emit the opcode from the original mode. Consider this small example: $ cat align.s .code 16 foo: add r0, r0 .align 3 add r0, r0 $ llvm-mc -triple armv7-none-linux align.s -filetype=obj -o t.o $ llvm-objdump -triple thumbv7 -d t.o Disassembly of section .text: foo: 0: 00 44 add r0, r0 2: 00 f0 20 e3 blx #4195904 6: 00 00 movs r0, r0 8: 00 44 add r0, r0 This shows that we have actually emitted an arm nop (e320f000) instead of a thumb nop. Unfortunately, this encodes to a thumb branch which causes bad things to happen when compiling assembly code with align directives. The fix is to notify the ARMAsmBackend when we switch mode. The MCMachOStreamer was already doing this correctly. This patch makes the same change for the MCElfStreamer. There is still a bug in the way nops are emitted for alignment because the MCAlignment fragment does not store the correct mode. The ARMAsmBackend will emit nops for the last mode it knew about. In the example above, we still generate an arm nop if we add a `.code 32` to the end of the file. PR18019 git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@195677 91177308-0d34-0410-b5e6-96231b3b80d8		2013-11-25 19:11:13 +00:00
..
MCDisassembler
MCParser	Support multiple COFF sections with the same name but different COMDAT.	2013-11-19 19:52:52 +00:00
CMakeLists.txt
ELFObjectWriter.cpp	Move the STT_FILE symbols out of the normal symbol table processing for	2013-10-29 01:06:17 +00:00
LLVMBuild.txt
MachObjectWriter.cpp
Makefile
MCAsmBackend.cpp
MCAsmInfo.cpp	Remove AllowQuotesInName and friends from MCAsmInfo.	2013-11-13 14:01:59 +00:00
MCAsmInfoCOFF.cpp	Remove AllowQuotesInName and friends from MCAsmInfo.	2013-11-13 14:01:59 +00:00
MCAsmInfoDarwin.cpp	Remove AllowQuotesInName and friends from MCAsmInfo.	2013-11-13 14:01:59 +00:00
MCAsmInfoELF.cpp
MCAsmStreamer.cpp	MCStreamer: Reimplement the virtual EmitRawText as a protected member, EmitRawTextImpl, to avoid string literal ambiguities	2013-10-24 22:43:10 +00:00
MCAssembler.cpp
MCAtom.cpp	[weak vtables] Remove a bunch of weak vtables	2013-11-19 00:57:56 +00:00
MCCodeEmitter.cpp
MCCodeGenInfo.cpp
MCContext.cpp	Support multiple COFF sections with the same name but different COMDAT.	2013-11-19 19:52:52 +00:00
MCDisassembler.cpp
MCDwarf.cpp
MCELF.cpp	Move the STT_FILE symbols out of the normal symbol table processing for	2013-10-29 01:06:17 +00:00
MCELFObjectTargetWriter.cpp
MCELFStreamer.cpp	ARM integrated assembler generates incorrect nop opcode	2013-11-25 19:11:13 +00:00
MCExpr.cpp
MCExternalSymbolizer.cpp	Add to the disassembler C API output reference types for	2013-11-01 00:00:07 +00:00
MCFunction.cpp
MCInst.cpp
MCInstPrinter.cpp
MCInstrAnalysis.cpp
MCLabel.cpp
MCMachObjectTargetWriter.cpp
MCMachOStreamer.cpp
MCModule.cpp
MCModuleYAML.cpp
MCNullStreamer.cpp
MCObjectDisassembler.cpp
MCObjectFileInfo.cpp	Add a method to get the object-file appropriate stack map section.	2013-11-08 22:14:49 +00:00
MCObjectStreamer.cpp	Emit DWARF line entries for all data in the instruction stream.	2013-10-20 02:16:18 +00:00
MCObjectSymbolizer.cpp
MCObjectWriter.cpp
MCPureStreamer.cpp
MCRegisterInfo.cpp
MCRelocationInfo.cpp
MCSection.cpp
MCSectionCOFF.cpp
MCSectionELF.cpp	Remove AllowQuotesInName and friends from MCAsmInfo.	2013-11-13 14:01:59 +00:00
MCSectionMachO.cpp
MCStreamer.cpp	[weak vtables] Remove a bunch of weak vtables	2013-11-19 00:57:56 +00:00
MCSubtargetInfo.cpp
MCSymbol.cpp	Don't mangle \n and "	2013-11-14 06:05:49 +00:00
MCSymbolizer.cpp
MCValue.cpp
MCWin64EH.cpp
SubtargetFeature.cpp
WinCOFFObjectWriter.cpp	[weak vtables] Remove a bunch of weak vtables	2013-11-19 00:57:56 +00:00
WinCOFFStreamer.cpp	Fix .comm and .lcomm on COFF.	2013-11-25 16:06:04 +00:00