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fe25521451
To support compressing the debug_line section that contains multiple fragments (due, I believe, to variation in choices of line table encoding depending on the size of instruction ranges in the actual program code) we needed to support compressing multiple MCFragments in a single pass. This patch implements that behavior by mutating the post-relaxed and relocated section to be the compressed form of its former self, including renaming the section. This is a more flexible (and less invasive, to a degree) implementation that will allow for other features such as "use compression only if it's smaller than the uncompressed data". Compressing debug_frame would be a possible further extension to this work, but I've left it for now. The hurdle there is alignment sections - which might require going as far as to refactor MCAssembler.cpp:writeFragment to handle writing to a byte buffer or an MCObjectWriter (there's already a virtual call there, so it shouldn't add substantial compile-time cost) which could in turn involve refactoring MCAsmBackend::writeNopData to use that same abstraction... which involves touching all the backends. This would remove the limited handling of fragment writing seen in ELFObjectWriter.cpp:getUncompressedData which would be nice - but it's more invasive. I did discover that I (perhaps obviously) don't need to handle relocations when I rewrite the fragments - since the relocations have already been applied and computed (and stored into ELFObjectWriter::Relocations) by this stage (necessarily, because we need to have written any immediate values or assembly-time relocations into the data already before we compress it, which we have). The test case doesn't necessarily cover that in detail - I can add more test coverage if that's preferred. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205990 91177308-0d34-0410-b5e6-96231b3b80d8 |
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| .. | ||
| MCDisassembler | ||
| MCParser | ||
| CMakeLists.txt | ||
| ELFObjectWriter.cpp | ||
| LLVMBuild.txt | ||
| MachObjectWriter.cpp | ||
| Makefile | ||
| MCAsmBackend.cpp | ||
| MCAsmInfo.cpp | ||
| MCAsmInfoCOFF.cpp | ||
| MCAsmInfoDarwin.cpp | ||
| MCAsmInfoELF.cpp | ||
| MCAsmStreamer.cpp | ||
| MCAssembler.cpp | ||
| MCAtom.cpp | ||
| MCCodeEmitter.cpp | ||
| MCCodeGenInfo.cpp | ||
| MCContext.cpp | ||
| MCDisassembler.cpp | ||
| MCDwarf.cpp | ||
| MCELF.cpp | ||
| MCELFObjectTargetWriter.cpp | ||
| MCELFStreamer.cpp | ||
| MCExpr.cpp | ||
| MCExternalSymbolizer.cpp | ||
| MCFixup.cpp | ||
| MCFunction.cpp | ||
| MCInst.cpp | ||
| MCInstPrinter.cpp | ||
| MCInstrAnalysis.cpp | ||
| MCLabel.cpp | ||
| MCLinkerOptimizationHint.cpp | ||
| MCMachObjectTargetWriter.cpp | ||
| MCMachOStreamer.cpp | ||
| MCModule.cpp | ||
| MCModuleYAML.cpp | ||
| MCNullStreamer.cpp | ||
| MCObjectDisassembler.cpp | ||
| MCObjectFileInfo.cpp | ||
| MCObjectStreamer.cpp | ||
| MCObjectSymbolizer.cpp | ||
| MCObjectWriter.cpp | ||
| MCRegisterInfo.cpp | ||
| MCRelocationInfo.cpp | ||
| MCSection.cpp | ||
| MCSectionCOFF.cpp | ||
| MCSectionELF.cpp | ||
| MCSectionMachO.cpp | ||
| MCStreamer.cpp | ||
| MCSubtargetInfo.cpp | ||
| MCSymbol.cpp | ||
| MCSymbolizer.cpp | ||
| MCValue.cpp | ||
| MCWin64EH.cpp | ||
| SubtargetFeature.cpp | ||
| WinCOFFObjectWriter.cpp | ||
| WinCOFFStreamer.cpp | ||