X-Git-Url: http://plrg.eecs.uci.edu/git/?p=oota-llvm.git;a=blobdiff_plain;f=lib%2FMC%2FMCWin64EH.cpp;h=1b73b7afb6a00ef28248b7792fad2759dfba2e68;hp=c05b4b17fc3e6c0c85e4004e477d5d5517206ed5;hb=ae65a7a88e8cf63c9ad01e1483181cb7e7bf6f55;hpb=0a0e50cd1812a42d7f06baab7001f99c82b1ef5f diff --git a/lib/MC/MCWin64EH.cpp b/lib/MC/MCWin64EH.cpp index c05b4b17fc3..1b73b7afb6a 100644 --- a/lib/MC/MCWin64EH.cpp +++ b/lib/MC/MCWin64EH.cpp @@ -8,148 +8,159 @@ //===----------------------------------------------------------------------===// #include "llvm/MC/MCWin64EH.h" -#include "llvm/MC/MCStreamer.h" +#include "llvm/ADT/Twine.h" #include "llvm/MC/MCContext.h" +#include "llvm/MC/MCExpr.h" #include "llvm/MC/MCObjectFileInfo.h" -#include "llvm/MC/MCSymbol.h" #include "llvm/MC/MCSectionCOFF.h" -#include "llvm/MC/MCExpr.h" -#include "llvm/ADT/Twine.h" +#include "llvm/MC/MCStreamer.h" +#include "llvm/MC/MCSymbol.h" +#include "llvm/Support/Win64EH.h" namespace llvm { // NOTE: All relocations generated here are 4-byte image-relative. -static uint8_t CountOfUnwindCodes(std::vector &instArray){ - uint8_t count = 0; - for (std::vector::const_iterator I = instArray.begin(), - E = instArray.end(); I != E; ++I) { - switch (I->getOperation()) { +static uint8_t CountOfUnwindCodes(std::vector &Insns) { + uint8_t Count = 0; + for (const auto &I : Insns) { + switch (static_cast(I.Operation)) { case Win64EH::UOP_PushNonVol: case Win64EH::UOP_AllocSmall: case Win64EH::UOP_SetFPReg: case Win64EH::UOP_PushMachFrame: - count += 1; + Count += 1; break; case Win64EH::UOP_SaveNonVol: case Win64EH::UOP_SaveXMM128: - count += 2; + Count += 2; break; case Win64EH::UOP_SaveNonVolBig: case Win64EH::UOP_SaveXMM128Big: - count += 3; + Count += 3; break; case Win64EH::UOP_AllocLarge: - if (I->getSize() > 512*1024-8) - count += 3; - else - count += 2; + Count += (I.Offset > 512 * 1024 - 8) ? 3 : 2; break; } } - return count; + return Count; } -static void EmitAbsDifference(MCStreamer &streamer, MCSymbol *lhs, - MCSymbol *rhs) { - MCContext &context = streamer.getContext(); - const MCExpr *diff = MCBinaryExpr::CreateSub(MCSymbolRefExpr::Create( - lhs, context), - MCSymbolRefExpr::Create( - rhs, context), - context); - streamer.EmitAbsValue(diff, 1); - +static void EmitAbsDifference(MCStreamer &Streamer, const MCSymbol *LHS, + const MCSymbol *RHS) { + MCContext &Context = Streamer.getContext(); + const MCExpr *Diff = + MCBinaryExpr::createSub(MCSymbolRefExpr::create(LHS, Context), + MCSymbolRefExpr::create(RHS, Context), Context); + Streamer.EmitValue(Diff, 1); } -static void EmitUnwindCode(MCStreamer &streamer, MCSymbol *begin, - MCWin64EHInstruction &inst) { - uint8_t b1, b2; +static void EmitUnwindCode(MCStreamer &streamer, const MCSymbol *begin, + WinEH::Instruction &inst) { + uint8_t b2; uint16_t w; - b2 = (inst.getOperation() & 0x0F); - switch (inst.getOperation()) { + b2 = (inst.Operation & 0x0F); + switch (static_cast(inst.Operation)) { case Win64EH::UOP_PushNonVol: - EmitAbsDifference(streamer, inst.getLabel(), begin); - b2 |= (inst.getRegister() & 0x0F) << 4; + EmitAbsDifference(streamer, inst.Label, begin); + b2 |= (inst.Register & 0x0F) << 4; streamer.EmitIntValue(b2, 1); break; case Win64EH::UOP_AllocLarge: - EmitAbsDifference(streamer, inst.getLabel(), begin); - if (inst.getSize() > 512*1024-8) { + EmitAbsDifference(streamer, inst.Label, begin); + if (inst.Offset > 512 * 1024 - 8) { b2 |= 0x10; streamer.EmitIntValue(b2, 1); - w = inst.getSize() & 0xFFF8; + w = inst.Offset & 0xFFF8; streamer.EmitIntValue(w, 2); - w = inst.getSize() >> 16; + w = inst.Offset >> 16; } else { streamer.EmitIntValue(b2, 1); - w = inst.getSize() >> 3; + w = inst.Offset >> 3; } streamer.EmitIntValue(w, 2); break; case Win64EH::UOP_AllocSmall: - b2 |= (((inst.getSize()-8) >> 3) & 0x0F) << 4; - EmitAbsDifference(streamer, inst.getLabel(), begin); + b2 |= (((inst.Offset - 8) >> 3) & 0x0F) << 4; + EmitAbsDifference(streamer, inst.Label, begin); streamer.EmitIntValue(b2, 1); break; case Win64EH::UOP_SetFPReg: - b1 = inst.getOffset() & 0xF0; - streamer.EmitIntValue(b1, 1); + EmitAbsDifference(streamer, inst.Label, begin); streamer.EmitIntValue(b2, 1); break; case Win64EH::UOP_SaveNonVol: case Win64EH::UOP_SaveXMM128: - b2 |= (inst.getRegister() & 0x0F) << 4; - EmitAbsDifference(streamer, inst.getLabel(), begin); + b2 |= (inst.Register & 0x0F) << 4; + EmitAbsDifference(streamer, inst.Label, begin); streamer.EmitIntValue(b2, 1); - w = inst.getOffset() >> 3; - if (inst.getOperation() == Win64EH::UOP_SaveXMM128) + w = inst.Offset >> 3; + if (inst.Operation == Win64EH::UOP_SaveXMM128) w >>= 1; streamer.EmitIntValue(w, 2); break; case Win64EH::UOP_SaveNonVolBig: case Win64EH::UOP_SaveXMM128Big: - b2 |= (inst.getRegister() & 0x0F) << 4; - EmitAbsDifference(streamer, inst.getLabel(), begin); + b2 |= (inst.Register & 0x0F) << 4; + EmitAbsDifference(streamer, inst.Label, begin); streamer.EmitIntValue(b2, 1); - if (inst.getOperation() == Win64EH::UOP_SaveXMM128Big) - w = inst.getOffset() & 0xFFF0; + if (inst.Operation == Win64EH::UOP_SaveXMM128Big) + w = inst.Offset & 0xFFF0; else - w = inst.getOffset() & 0xFFF8; + w = inst.Offset & 0xFFF8; streamer.EmitIntValue(w, 2); - w = inst.getOffset() >> 16; + w = inst.Offset >> 16; streamer.EmitIntValue(w, 2); break; case Win64EH::UOP_PushMachFrame: - if (inst.isPushCodeFrame()) + if (inst.Offset == 1) b2 |= 0x10; - EmitAbsDifference(streamer, inst.getLabel(), begin); + EmitAbsDifference(streamer, inst.Label, begin); streamer.EmitIntValue(b2, 1); break; } } +static void EmitSymbolRefWithOfs(MCStreamer &streamer, + const MCSymbol *Base, + const MCSymbol *Other) { + MCContext &Context = streamer.getContext(); + const MCSymbolRefExpr *BaseRef = MCSymbolRefExpr::create(Base, Context); + const MCSymbolRefExpr *OtherRef = MCSymbolRefExpr::create(Other, Context); + const MCExpr *Ofs = MCBinaryExpr::createSub(OtherRef, BaseRef, Context); + const MCSymbolRefExpr *BaseRefRel = MCSymbolRefExpr::create(Base, + MCSymbolRefExpr::VK_COFF_IMGREL32, + Context); + streamer.EmitValue(MCBinaryExpr::createAdd(BaseRefRel, Ofs, Context), 4); +} + static void EmitRuntimeFunction(MCStreamer &streamer, - const MCWin64EHUnwindInfo *info) { + const WinEH::FrameInfo *info) { MCContext &context = streamer.getContext(); streamer.EmitValueToAlignment(4); - streamer.EmitValue(MCSymbolRefExpr::Create(info->Begin, context), 4); - streamer.EmitValue(MCSymbolRefExpr::Create(info->End, context), 4); - streamer.EmitValue(MCSymbolRefExpr::Create(info->Symbol, context), 4); + EmitSymbolRefWithOfs(streamer, info->Function, info->Begin); + EmitSymbolRefWithOfs(streamer, info->Function, info->End); + streamer.EmitValue(MCSymbolRefExpr::create(info->Symbol, + MCSymbolRefExpr::VK_COFF_IMGREL32, + context), 4); } -static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info) { +static void EmitUnwindInfo(MCStreamer &streamer, WinEH::FrameInfo *info) { // If this UNWIND_INFO already has a symbol, it's already been emitted. - if (info->Symbol) return; + if (info->Symbol) + return; MCContext &context = streamer.getContext(); + MCSymbol *Label = context.createTempSymbol(); + streamer.EmitValueToAlignment(4); + streamer.EmitLabel(Label); + info->Symbol = Label; + // Upper 3 bits are the version number (currently 1). uint8_t flags = 0x01; - info->Symbol = context.CreateTempSymbol(); - streamer.EmitLabel(info->Symbol); - if (info->ChainedParent) flags |= Win64EH::UNW_ChainInfo << 3; else { @@ -170,109 +181,72 @@ static void EmitUnwindInfo(MCStreamer &streamer, MCWin64EHUnwindInfo *info) { uint8_t frame = 0; if (info->LastFrameInst >= 0) { - MCWin64EHInstruction &frameInst = info->Instructions[info->LastFrameInst]; - assert(frameInst.getOperation() == Win64EH::UOP_SetFPReg); - frame = (frameInst.getRegister() & 0x0F) | - (frameInst.getOffset() & 0xF0); + WinEH::Instruction &frameInst = info->Instructions[info->LastFrameInst]; + assert(frameInst.Operation == Win64EH::UOP_SetFPReg); + frame = (frameInst.Register & 0x0F) | (frameInst.Offset & 0xF0); } streamer.EmitIntValue(frame, 1); // Emit unwind instructions (in reverse order). uint8_t numInst = info->Instructions.size(); for (uint8_t c = 0; c < numInst; ++c) { - MCWin64EHInstruction inst = info->Instructions.back(); + WinEH::Instruction inst = info->Instructions.back(); info->Instructions.pop_back(); EmitUnwindCode(streamer, info->Begin, inst); } + // For alignment purposes, the instruction array will always have an even + // number of entries, with the final entry potentially unused (in which case + // the array will be one longer than indicated by the count of unwind codes + // field). + if (numCodes & 1) { + streamer.EmitIntValue(0, 2); + } + if (flags & (Win64EH::UNW_ChainInfo << 3)) EmitRuntimeFunction(streamer, info->ChainedParent); else if (flags & ((Win64EH::UNW_TerminateHandler|Win64EH::UNW_ExceptionHandler) << 3)) - streamer.EmitValue(MCSymbolRefExpr::Create(info->ExceptionHandler, context), - 4); - else if (numCodes < 2) { + streamer.EmitValue(MCSymbolRefExpr::create(info->ExceptionHandler, + MCSymbolRefExpr::VK_COFF_IMGREL32, + context), 4); + else if (numCodes == 0) { // The minimum size of an UNWIND_INFO struct is 8 bytes. If we're not // a chained unwind info, if there is no handler, and if there are fewer // than 2 slots used in the unwind code array, we have to pad to 8 bytes. - if (numCodes == 1) - streamer.EmitIntValue(0, 2); - else - streamer.EmitIntValue(0, 4); + streamer.EmitIntValue(0, 4); } } -StringRef MCWin64EHUnwindEmitter::GetSectionSuffix(const MCSymbol *func) { - if (!func || !func->isInSection()) return ""; - const MCSection *section = &func->getSection(); - const MCSectionCOFF *COFFSection; - if ((COFFSection = dyn_cast(section))) { - StringRef name = COFFSection->getSectionName(); - size_t dollar = name.find('$'); - size_t dot = name.find('.', 1); - if (dollar == StringRef::npos && dot == StringRef::npos) - return ""; - if (dot == StringRef::npos) - return name.substr(dollar); - if (dollar == StringRef::npos || dot < dollar) - return name.substr(dot); - return name.substr(dollar); - } - return ""; -} +namespace Win64EH { +void UnwindEmitter::Emit(MCStreamer &Streamer) const { + MCContext &Context = Streamer.getContext(); -static const MCSection *getWin64EHTableSection(StringRef suffix, - MCContext &context) { - if (suffix == "") - return context.getObjectFileInfo()->getXDataSection(); - - return context.getCOFFSection((".xdata"+suffix).str(), - COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | - COFF::IMAGE_SCN_MEM_READ, - SectionKind::getDataRel()); -} + // Emit the unwind info structs first. + for (const auto &CFI : Streamer.getWinFrameInfos()) { + MCSection *XData = getXDataSection(CFI->Function, Context); + Streamer.SwitchSection(XData); + EmitUnwindInfo(Streamer, CFI); + } -static const MCSection *getWin64EHFuncTableSection(StringRef suffix, - MCContext &context) { - if (suffix == "") - return context.getObjectFileInfo()->getPDataSection(); - return context.getCOFFSection((".pdata"+suffix).str(), - COFF::IMAGE_SCN_CNT_INITIALIZED_DATA | - COFF::IMAGE_SCN_MEM_READ, - SectionKind::getDataRel()); + // Now emit RUNTIME_FUNCTION entries. + for (const auto &CFI : Streamer.getWinFrameInfos()) { + MCSection *PData = getPDataSection(CFI->Function, Context); + Streamer.SwitchSection(PData); + EmitRuntimeFunction(Streamer, CFI); + } } -void MCWin64EHUnwindEmitter::EmitUnwindInfo(MCStreamer &streamer, - MCWin64EHUnwindInfo *info) { +void UnwindEmitter::EmitUnwindInfo(MCStreamer &Streamer, + WinEH::FrameInfo *info) const { // Switch sections (the static function above is meant to be called from // here and from Emit(). - MCContext &context = streamer.getContext(); - const MCSection *xdataSect = - getWin64EHTableSection(GetSectionSuffix(info->Function), context); - streamer.SwitchSection(xdataSect); + MCContext &context = Streamer.getContext(); + MCSection *xdataSect = getXDataSection(info->Function, context); + Streamer.SwitchSection(xdataSect); - llvm::EmitUnwindInfo(streamer, info); + llvm::EmitUnwindInfo(Streamer, info); } - -void MCWin64EHUnwindEmitter::Emit(MCStreamer &streamer) { - MCContext &context = streamer.getContext(); - // Emit the unwind info structs first. - for (unsigned i = 0; i < streamer.getNumW64UnwindInfos(); ++i) { - MCWin64EHUnwindInfo &info = streamer.getW64UnwindInfo(i); - const MCSection *xdataSect = - getWin64EHTableSection(GetSectionSuffix(info.Function), context); - streamer.SwitchSection(xdataSect); - llvm::EmitUnwindInfo(streamer, &info); - } - // Now emit RUNTIME_FUNCTION entries. - for (unsigned i = 0; i < streamer.getNumW64UnwindInfos(); ++i) { - MCWin64EHUnwindInfo &info = streamer.getW64UnwindInfo(i); - const MCSection *pdataSect = - getWin64EHFuncTableSection(GetSectionSuffix(info.Function), context); - streamer.SwitchSection(pdataSect); - EmitRuntimeFunction(streamer, &info); - } } - } // End of namespace llvm