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Diffstat (limited to 'llvm/lib/MC/MCContext.cpp')
| -rw-r--r-- | llvm/lib/MC/MCContext.cpp | 724 |
1 files changed, 724 insertions, 0 deletions
diff --git a/llvm/lib/MC/MCContext.cpp b/llvm/lib/MC/MCContext.cpp new file mode 100644 index 000000000000..a69ee19e1a1a --- /dev/null +++ b/llvm/lib/MC/MCContext.cpp @@ -0,0 +1,724 @@ +//===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// + +#include "llvm/MC/MCContext.h" +#include "llvm/ADT/Optional.h" +#include "llvm/ADT/SmallString.h" +#include "llvm/ADT/SmallVector.h" +#include "llvm/ADT/StringMap.h" +#include "llvm/ADT/StringRef.h" +#include "llvm/ADT/Twine.h" +#include "llvm/BinaryFormat/COFF.h" +#include "llvm/BinaryFormat/ELF.h" +#include "llvm/MC/MCAsmInfo.h" +#include "llvm/MC/MCCodeView.h" +#include "llvm/MC/MCDwarf.h" +#include "llvm/MC/MCExpr.h" +#include "llvm/MC/MCFragment.h" +#include "llvm/MC/MCLabel.h" +#include "llvm/MC/MCObjectFileInfo.h" +#include "llvm/MC/MCSectionCOFF.h" +#include "llvm/MC/MCSectionELF.h" +#include "llvm/MC/MCSectionMachO.h" +#include "llvm/MC/MCSectionWasm.h" +#include "llvm/MC/MCSectionXCOFF.h" +#include "llvm/MC/MCStreamer.h" +#include "llvm/MC/MCSymbol.h" +#include "llvm/MC/MCSymbolCOFF.h" +#include "llvm/MC/MCSymbolELF.h" +#include "llvm/MC/MCSymbolMachO.h" +#include "llvm/MC/MCSymbolWasm.h" +#include "llvm/MC/MCSymbolXCOFF.h" +#include "llvm/MC/SectionKind.h" +#include "llvm/Support/Casting.h" +#include "llvm/Support/CommandLine.h" +#include "llvm/Support/ErrorHandling.h" +#include "llvm/Support/MemoryBuffer.h" +#include "llvm/Support/Path.h" +#include "llvm/Support/Signals.h" +#include "llvm/Support/SourceMgr.h" +#include "llvm/Support/raw_ostream.h" +#include <cassert> +#include <cstdlib> +#include <tuple> +#include <utility> + +using namespace llvm; + +static cl::opt<char*> +AsSecureLogFileName("as-secure-log-file-name", + cl::desc("As secure log file name (initialized from " + "AS_SECURE_LOG_FILE env variable)"), + cl::init(getenv("AS_SECURE_LOG_FILE")), cl::Hidden); + +MCContext::MCContext(const MCAsmInfo *mai, const MCRegisterInfo *mri, + const MCObjectFileInfo *mofi, const SourceMgr *mgr, + MCTargetOptions const *TargetOpts, bool DoAutoReset) + : SrcMgr(mgr), InlineSrcMgr(nullptr), MAI(mai), MRI(mri), MOFI(mofi), + Symbols(Allocator), UsedNames(Allocator), + InlineAsmUsedLabelNames(Allocator), + CurrentDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0), + AutoReset(DoAutoReset), TargetOptions(TargetOpts) { + SecureLogFile = AsSecureLogFileName; + + if (SrcMgr && SrcMgr->getNumBuffers()) + MainFileName = + SrcMgr->getMemoryBuffer(SrcMgr->getMainFileID())->getBufferIdentifier(); +} + +MCContext::~MCContext() { + if (AutoReset) + reset(); + + // NOTE: The symbols are all allocated out of a bump pointer allocator, + // we don't need to free them here. +} + +//===----------------------------------------------------------------------===// +// Module Lifetime Management +//===----------------------------------------------------------------------===// + +void MCContext::reset() { + // Call the destructors so the fragments are freed + COFFAllocator.DestroyAll(); + ELFAllocator.DestroyAll(); + MachOAllocator.DestroyAll(); + XCOFFAllocator.DestroyAll(); + + MCSubtargetAllocator.DestroyAll(); + InlineAsmUsedLabelNames.clear(); + UsedNames.clear(); + Symbols.clear(); + Allocator.Reset(); + Instances.clear(); + CompilationDir.clear(); + MainFileName.clear(); + MCDwarfLineTablesCUMap.clear(); + SectionsForRanges.clear(); + MCGenDwarfLabelEntries.clear(); + DwarfDebugFlags = StringRef(); + DwarfCompileUnitID = 0; + CurrentDwarfLoc = MCDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0); + + CVContext.reset(); + + MachOUniquingMap.clear(); + ELFUniquingMap.clear(); + COFFUniquingMap.clear(); + WasmUniquingMap.clear(); + XCOFFUniquingMap.clear(); + + NextID.clear(); + AllowTemporaryLabels = true; + DwarfLocSeen = false; + GenDwarfForAssembly = false; + GenDwarfFileNumber = 0; + + HadError = false; +} + +//===----------------------------------------------------------------------===// +// Symbol Manipulation +//===----------------------------------------------------------------------===// + +MCSymbol *MCContext::getOrCreateSymbol(const Twine &Name) { + SmallString<128> NameSV; + StringRef NameRef = Name.toStringRef(NameSV); + + assert(!NameRef.empty() && "Normal symbols cannot be unnamed!"); + + MCSymbol *&Sym = Symbols[NameRef]; + if (!Sym) + Sym = createSymbol(NameRef, false, false); + + return Sym; +} + +MCSymbol *MCContext::getOrCreateFrameAllocSymbol(StringRef FuncName, + unsigned Idx) { + return getOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + FuncName + + "$frame_escape_" + Twine(Idx)); +} + +MCSymbol *MCContext::getOrCreateParentFrameOffsetSymbol(StringRef FuncName) { + return getOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + FuncName + + "$parent_frame_offset"); +} + +MCSymbol *MCContext::getOrCreateLSDASymbol(StringRef FuncName) { + return getOrCreateSymbol(Twine(MAI->getPrivateGlobalPrefix()) + "__ehtable$" + + FuncName); +} + +MCSymbol *MCContext::createSymbolImpl(const StringMapEntry<bool> *Name, + bool IsTemporary) { + if (MOFI) { + switch (MOFI->getObjectFileType()) { + case MCObjectFileInfo::IsCOFF: + return new (Name, *this) MCSymbolCOFF(Name, IsTemporary); + case MCObjectFileInfo::IsELF: + return new (Name, *this) MCSymbolELF(Name, IsTemporary); + case MCObjectFileInfo::IsMachO: + return new (Name, *this) MCSymbolMachO(Name, IsTemporary); + case MCObjectFileInfo::IsWasm: + return new (Name, *this) MCSymbolWasm(Name, IsTemporary); + case MCObjectFileInfo::IsXCOFF: + return new (Name, *this) MCSymbolXCOFF(Name, IsTemporary); + } + } + return new (Name, *this) MCSymbol(MCSymbol::SymbolKindUnset, Name, + IsTemporary); +} + +MCSymbol *MCContext::createSymbol(StringRef Name, bool AlwaysAddSuffix, + bool CanBeUnnamed) { + if (CanBeUnnamed && !UseNamesOnTempLabels) + return createSymbolImpl(nullptr, true); + + // Determine whether this is a user written assembler temporary or normal + // label, if used. + bool IsTemporary = CanBeUnnamed; + if (AllowTemporaryLabels && !IsTemporary) + IsTemporary = Name.startswith(MAI->getPrivateGlobalPrefix()); + + SmallString<128> NewName = Name; + bool AddSuffix = AlwaysAddSuffix; + unsigned &NextUniqueID = NextID[Name]; + while (true) { + if (AddSuffix) { + NewName.resize(Name.size()); + raw_svector_ostream(NewName) << NextUniqueID++; + } + auto NameEntry = UsedNames.insert(std::make_pair(NewName, true)); + if (NameEntry.second || !NameEntry.first->second) { + // Ok, we found a name. + // Mark it as used for a non-section symbol. + NameEntry.first->second = true; + // Have the MCSymbol object itself refer to the copy of the string that is + // embedded in the UsedNames entry. + return createSymbolImpl(&*NameEntry.first, IsTemporary); + } + assert(IsTemporary && "Cannot rename non-temporary symbols"); + AddSuffix = true; + } + llvm_unreachable("Infinite loop"); +} + +MCSymbol *MCContext::createTempSymbol(const Twine &Name, bool AlwaysAddSuffix, + bool CanBeUnnamed) { + SmallString<128> NameSV; + raw_svector_ostream(NameSV) << MAI->getPrivateGlobalPrefix() << Name; + return createSymbol(NameSV, AlwaysAddSuffix, CanBeUnnamed); +} + +MCSymbol *MCContext::createLinkerPrivateTempSymbol() { + SmallString<128> NameSV; + raw_svector_ostream(NameSV) << MAI->getLinkerPrivateGlobalPrefix() << "tmp"; + return createSymbol(NameSV, true, false); +} + +MCSymbol *MCContext::createTempSymbol(bool CanBeUnnamed) { + return createTempSymbol("tmp", true, CanBeUnnamed); +} + +unsigned MCContext::NextInstance(unsigned LocalLabelVal) { + MCLabel *&Label = Instances[LocalLabelVal]; + if (!Label) + Label = new (*this) MCLabel(0); + return Label->incInstance(); +} + +unsigned MCContext::GetInstance(unsigned LocalLabelVal) { + MCLabel *&Label = Instances[LocalLabelVal]; + if (!Label) + Label = new (*this) MCLabel(0); + return Label->getInstance(); +} + +MCSymbol *MCContext::getOrCreateDirectionalLocalSymbol(unsigned LocalLabelVal, + unsigned Instance) { + MCSymbol *&Sym = LocalSymbols[std::make_pair(LocalLabelVal, Instance)]; + if (!Sym) + Sym = createTempSymbol(false); + return Sym; +} + +MCSymbol *MCContext::createDirectionalLocalSymbol(unsigned LocalLabelVal) { + unsigned Instance = NextInstance(LocalLabelVal); + return getOrCreateDirectionalLocalSymbol(LocalLabelVal, Instance); +} + +MCSymbol *MCContext::getDirectionalLocalSymbol(unsigned LocalLabelVal, + bool Before) { + unsigned Instance = GetInstance(LocalLabelVal); + if (!Before) + ++Instance; + return getOrCreateDirectionalLocalSymbol(LocalLabelVal, Instance); +} + +MCSymbol *MCContext::lookupSymbol(const Twine &Name) const { + SmallString<128> NameSV; + StringRef NameRef = Name.toStringRef(NameSV); + return Symbols.lookup(NameRef); +} + +void MCContext::setSymbolValue(MCStreamer &Streamer, + StringRef Sym, + uint64_t Val) { + auto Symbol = getOrCreateSymbol(Sym); + Streamer.EmitAssignment(Symbol, MCConstantExpr::create(Val, *this)); +} + +void MCContext::registerInlineAsmLabel(MCSymbol *Sym) { + InlineAsmUsedLabelNames[Sym->getName()] = Sym; +} + +//===----------------------------------------------------------------------===// +// Section Management +//===----------------------------------------------------------------------===// + +MCSectionMachO *MCContext::getMachOSection(StringRef Segment, StringRef Section, + unsigned TypeAndAttributes, + unsigned Reserved2, SectionKind Kind, + const char *BeginSymName) { + // We unique sections by their segment/section pair. The returned section + // may not have the same flags as the requested section, if so this should be + // diagnosed by the client as an error. + + // Form the name to look up. + SmallString<64> Name; + Name += Segment; + Name.push_back(','); + Name += Section; + + // Do the lookup, if we have a hit, return it. + MCSectionMachO *&Entry = MachOUniquingMap[Name]; + if (Entry) + return Entry; + + MCSymbol *Begin = nullptr; + if (BeginSymName) + Begin = createTempSymbol(BeginSymName, false); + + // Otherwise, return a new section. + return Entry = new (MachOAllocator.Allocate()) MCSectionMachO( + Segment, Section, TypeAndAttributes, Reserved2, Kind, Begin); +} + +void MCContext::renameELFSection(MCSectionELF *Section, StringRef Name) { + StringRef GroupName; + if (const MCSymbol *Group = Section->getGroup()) + GroupName = Group->getName(); + + unsigned UniqueID = Section->getUniqueID(); + ELFUniquingMap.erase( + ELFSectionKey{Section->getSectionName(), GroupName, UniqueID}); + auto I = ELFUniquingMap.insert(std::make_pair( + ELFSectionKey{Name, GroupName, UniqueID}, + Section)) + .first; + StringRef CachedName = I->first.SectionName; + const_cast<MCSectionELF *>(Section)->setSectionName(CachedName); +} + +MCSectionELF *MCContext::createELFSectionImpl(StringRef Section, unsigned Type, + unsigned Flags, SectionKind K, + unsigned EntrySize, + const MCSymbolELF *Group, + unsigned UniqueID, + const MCSymbolELF *Associated) { + MCSymbolELF *R; + MCSymbol *&Sym = Symbols[Section]; + // A section symbol can not redefine regular symbols. There may be multiple + // sections with the same name, in which case the first such section wins. + if (Sym && Sym->isDefined() && + (!Sym->isInSection() || Sym->getSection().getBeginSymbol() != Sym)) + reportError(SMLoc(), "invalid symbol redefinition"); + if (Sym && Sym->isUndefined()) { + R = cast<MCSymbolELF>(Sym); + } else { + auto NameIter = UsedNames.insert(std::make_pair(Section, false)).first; + R = new (&*NameIter, *this) MCSymbolELF(&*NameIter, /*isTemporary*/ false); + if (!Sym) + Sym = R; + } + R->setBinding(ELF::STB_LOCAL); + R->setType(ELF::STT_SECTION); + + auto *Ret = new (ELFAllocator.Allocate()) MCSectionELF( + Section, Type, Flags, K, EntrySize, Group, UniqueID, R, Associated); + + auto *F = new MCDataFragment(); + Ret->getFragmentList().insert(Ret->begin(), F); + F->setParent(Ret); + R->setFragment(F); + + return Ret; +} + +MCSectionELF *MCContext::createELFRelSection(const Twine &Name, unsigned Type, + unsigned Flags, unsigned EntrySize, + const MCSymbolELF *Group, + const MCSectionELF *RelInfoSection) { + StringMap<bool>::iterator I; + bool Inserted; + std::tie(I, Inserted) = + RelSecNames.insert(std::make_pair(Name.str(), true)); + + return createELFSectionImpl( + I->getKey(), Type, Flags, SectionKind::getReadOnly(), EntrySize, Group, + true, cast<MCSymbolELF>(RelInfoSection->getBeginSymbol())); +} + +MCSectionELF *MCContext::getELFNamedSection(const Twine &Prefix, + const Twine &Suffix, unsigned Type, + unsigned Flags, + unsigned EntrySize) { + return getELFSection(Prefix + "." + Suffix, Type, Flags, EntrySize, Suffix); +} + +MCSectionELF *MCContext::getELFSection(const Twine &Section, unsigned Type, + unsigned Flags, unsigned EntrySize, + const Twine &Group, unsigned UniqueID, + const MCSymbolELF *Associated) { + MCSymbolELF *GroupSym = nullptr; + if (!Group.isTriviallyEmpty() && !Group.str().empty()) + GroupSym = cast<MCSymbolELF>(getOrCreateSymbol(Group)); + + return getELFSection(Section, Type, Flags, EntrySize, GroupSym, UniqueID, + Associated); +} + +MCSectionELF *MCContext::getELFSection(const Twine &Section, unsigned Type, + unsigned Flags, unsigned EntrySize, + const MCSymbolELF *GroupSym, + unsigned UniqueID, + const MCSymbolELF *Associated) { + StringRef Group = ""; + if (GroupSym) + Group = GroupSym->getName(); + // Do the lookup, if we have a hit, return it. + auto IterBool = ELFUniquingMap.insert( + std::make_pair(ELFSectionKey{Section.str(), Group, UniqueID}, nullptr)); + auto &Entry = *IterBool.first; + if (!IterBool.second) + return Entry.second; + + StringRef CachedName = Entry.first.SectionName; + + SectionKind Kind; + if (Flags & ELF::SHF_ARM_PURECODE) + Kind = SectionKind::getExecuteOnly(); + else if (Flags & ELF::SHF_EXECINSTR) + Kind = SectionKind::getText(); + else + Kind = SectionKind::getReadOnly(); + + MCSectionELF *Result = createELFSectionImpl( + CachedName, Type, Flags, Kind, EntrySize, GroupSym, UniqueID, Associated); + Entry.second = Result; + return Result; +} + +MCSectionELF *MCContext::createELFGroupSection(const MCSymbolELF *Group) { + return createELFSectionImpl(".group", ELF::SHT_GROUP, 0, + SectionKind::getReadOnly(), 4, Group, ~0, + nullptr); +} + +MCSectionCOFF *MCContext::getCOFFSection(StringRef Section, + unsigned Characteristics, + SectionKind Kind, + StringRef COMDATSymName, int Selection, + unsigned UniqueID, + const char *BeginSymName) { + MCSymbol *COMDATSymbol = nullptr; + if (!COMDATSymName.empty()) { + COMDATSymbol = getOrCreateSymbol(COMDATSymName); + COMDATSymName = COMDATSymbol->getName(); + } + + + // Do the lookup, if we have a hit, return it. + COFFSectionKey T{Section, COMDATSymName, Selection, UniqueID}; + auto IterBool = COFFUniquingMap.insert(std::make_pair(T, nullptr)); + auto Iter = IterBool.first; + if (!IterBool.second) + return Iter->second; + + MCSymbol *Begin = nullptr; + if (BeginSymName) + Begin = createTempSymbol(BeginSymName, false); + + StringRef CachedName = Iter->first.SectionName; + MCSectionCOFF *Result = new (COFFAllocator.Allocate()) MCSectionCOFF( + CachedName, Characteristics, COMDATSymbol, Selection, Kind, Begin); + + Iter->second = Result; + return Result; +} + +MCSectionCOFF *MCContext::getCOFFSection(StringRef Section, + unsigned Characteristics, + SectionKind Kind, + const char *BeginSymName) { + return getCOFFSection(Section, Characteristics, Kind, "", 0, GenericSectionID, + BeginSymName); +} + +MCSectionCOFF *MCContext::getAssociativeCOFFSection(MCSectionCOFF *Sec, + const MCSymbol *KeySym, + unsigned UniqueID) { + // Return the normal section if we don't have to be associative or unique. + if (!KeySym && UniqueID == GenericSectionID) + return Sec; + + // If we have a key symbol, make an associative section with the same name and + // kind as the normal section. + unsigned Characteristics = Sec->getCharacteristics(); + if (KeySym) { + Characteristics |= COFF::IMAGE_SCN_LNK_COMDAT; + return getCOFFSection(Sec->getSectionName(), Characteristics, + Sec->getKind(), KeySym->getName(), + COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE, UniqueID); + } + + return getCOFFSection(Sec->getSectionName(), Characteristics, Sec->getKind(), + "", 0, UniqueID); +} + +MCSectionWasm *MCContext::getWasmSection(const Twine &Section, SectionKind K, + const Twine &Group, unsigned UniqueID, + const char *BeginSymName) { + MCSymbolWasm *GroupSym = nullptr; + if (!Group.isTriviallyEmpty() && !Group.str().empty()) { + GroupSym = cast<MCSymbolWasm>(getOrCreateSymbol(Group)); + GroupSym->setComdat(true); + } + + return getWasmSection(Section, K, GroupSym, UniqueID, BeginSymName); +} + +MCSectionWasm *MCContext::getWasmSection(const Twine &Section, SectionKind Kind, + const MCSymbolWasm *GroupSym, + unsigned UniqueID, + const char *BeginSymName) { + StringRef Group = ""; + if (GroupSym) + Group = GroupSym->getName(); + // Do the lookup, if we have a hit, return it. + auto IterBool = WasmUniquingMap.insert( + std::make_pair(WasmSectionKey{Section.str(), Group, UniqueID}, nullptr)); + auto &Entry = *IterBool.first; + if (!IterBool.second) + return Entry.second; + + StringRef CachedName = Entry.first.SectionName; + + MCSymbol *Begin = createSymbol(CachedName, false, false); + cast<MCSymbolWasm>(Begin)->setType(wasm::WASM_SYMBOL_TYPE_SECTION); + + MCSectionWasm *Result = new (WasmAllocator.Allocate()) + MCSectionWasm(CachedName, Kind, GroupSym, UniqueID, Begin); + Entry.second = Result; + + auto *F = new MCDataFragment(); + Result->getFragmentList().insert(Result->begin(), F); + F->setParent(Result); + Begin->setFragment(F); + + return Result; +} + +MCSectionXCOFF *MCContext::getXCOFFSection(StringRef Section, + XCOFF::StorageMappingClass SMC, + XCOFF::SymbolType Type, + XCOFF::StorageClass SC, + SectionKind Kind, + const char *BeginSymName) { + // Do the lookup. If we have a hit, return it. + auto IterBool = XCOFFUniquingMap.insert( + std::make_pair(XCOFFSectionKey{Section.str(), SMC}, nullptr)); + auto &Entry = *IterBool.first; + if (!IterBool.second) + return Entry.second; + + // Otherwise, return a new section. + StringRef CachedName = Entry.first.SectionName; + + MCSymbol *Begin = nullptr; + if (BeginSymName) + Begin = createTempSymbol(BeginSymName, false); + + MCSectionXCOFF *Result = new (XCOFFAllocator.Allocate()) + MCSectionXCOFF(CachedName, SMC, Type, SC, Kind, Begin); + Entry.second = Result; + + auto *F = new MCDataFragment(); + Result->getFragmentList().insert(Result->begin(), F); + F->setParent(Result); + + if (Begin) + Begin->setFragment(F); + + return Result; +} + +MCSubtargetInfo &MCContext::getSubtargetCopy(const MCSubtargetInfo &STI) { + return *new (MCSubtargetAllocator.Allocate()) MCSubtargetInfo(STI); +} + +void MCContext::addDebugPrefixMapEntry(const std::string &From, + const std::string &To) { + DebugPrefixMap.insert(std::make_pair(From, To)); +} + +void MCContext::RemapDebugPaths() { + const auto &DebugPrefixMap = this->DebugPrefixMap; + const auto RemapDebugPath = [&DebugPrefixMap](std::string &Path) { + for (const auto &Entry : DebugPrefixMap) + if (StringRef(Path).startswith(Entry.first)) { + std::string RemappedPath = + (Twine(Entry.second) + Path.substr(Entry.first.size())).str(); + Path.swap(RemappedPath); + } + }; + + // Remap compilation directory. + std::string CompDir = CompilationDir.str(); + RemapDebugPath(CompDir); + CompilationDir = CompDir; + + // Remap MCDwarfDirs in all compilation units. + for (auto &CUIDTablePair : MCDwarfLineTablesCUMap) + for (auto &Dir : CUIDTablePair.second.getMCDwarfDirs()) + RemapDebugPath(Dir); +} + +//===----------------------------------------------------------------------===// +// Dwarf Management +//===----------------------------------------------------------------------===// + +void MCContext::setGenDwarfRootFile(StringRef InputFileName, StringRef Buffer) { + // MCDwarf needs the root file as well as the compilation directory. + // If we find a '.file 0' directive that will supersede these values. + Optional<MD5::MD5Result> Cksum; + if (getDwarfVersion() >= 5) { + MD5 Hash; + MD5::MD5Result Sum; + Hash.update(Buffer); + Hash.final(Sum); + Cksum = Sum; + } + // Canonicalize the root filename. It cannot be empty, and should not + // repeat the compilation dir. + // The MCContext ctor initializes MainFileName to the name associated with + // the SrcMgr's main file ID, which might be the same as InputFileName (and + // possibly include directory components). + // Or, MainFileName might have been overridden by a -main-file-name option, + // which is supposed to be just a base filename with no directory component. + // So, if the InputFileName and MainFileName are not equal, assume + // MainFileName is a substitute basename and replace the last component. + SmallString<1024> FileNameBuf = InputFileName; + if (FileNameBuf.empty() || FileNameBuf == "-") + FileNameBuf = "<stdin>"; + if (!getMainFileName().empty() && FileNameBuf != getMainFileName()) { + llvm::sys::path::remove_filename(FileNameBuf); + llvm::sys::path::append(FileNameBuf, getMainFileName()); + } + StringRef FileName = FileNameBuf; + if (FileName.consume_front(getCompilationDir())) + if (llvm::sys::path::is_separator(FileName.front())) + FileName = FileName.drop_front(); + assert(!FileName.empty()); + setMCLineTableRootFile( + /*CUID=*/0, getCompilationDir(), FileName, Cksum, None); +} + +/// getDwarfFile - takes a file name and number to place in the dwarf file and +/// directory tables. If the file number has already been allocated it is an +/// error and zero is returned and the client reports the error, else the +/// allocated file number is returned. The file numbers may be in any order. +Expected<unsigned> MCContext::getDwarfFile(StringRef Directory, + StringRef FileName, + unsigned FileNumber, + Optional<MD5::MD5Result> Checksum, + Optional<StringRef> Source, + unsigned CUID) { + MCDwarfLineTable &Table = MCDwarfLineTablesCUMap[CUID]; + return Table.tryGetFile(Directory, FileName, Checksum, Source, DwarfVersion, + FileNumber); +} + +/// isValidDwarfFileNumber - takes a dwarf file number and returns true if it +/// currently is assigned and false otherwise. +bool MCContext::isValidDwarfFileNumber(unsigned FileNumber, unsigned CUID) { + const MCDwarfLineTable &LineTable = getMCDwarfLineTable(CUID); + if (FileNumber == 0) + return getDwarfVersion() >= 5; + if (FileNumber >= LineTable.getMCDwarfFiles().size()) + return false; + + return !LineTable.getMCDwarfFiles()[FileNumber].Name.empty(); +} + +/// Remove empty sections from SectionsForRanges, to avoid generating +/// useless debug info for them. +void MCContext::finalizeDwarfSections(MCStreamer &MCOS) { + SectionsForRanges.remove_if( + [&](MCSection *Sec) { return !MCOS.mayHaveInstructions(*Sec); }); +} + +CodeViewContext &MCContext::getCVContext() { + if (!CVContext.get()) + CVContext.reset(new CodeViewContext); + return *CVContext.get(); +} + +//===----------------------------------------------------------------------===// +// Error Reporting +//===----------------------------------------------------------------------===// + +void MCContext::reportError(SMLoc Loc, const Twine &Msg) { + HadError = true; + + // If we have a source manager use it. Otherwise, try using the inline source + // manager. + // If that fails, use the generic report_fatal_error(). + if (SrcMgr) + SrcMgr->PrintMessage(Loc, SourceMgr::DK_Error, Msg); + else if (InlineSrcMgr) + InlineSrcMgr->PrintMessage(Loc, SourceMgr::DK_Error, Msg); + else + report_fatal_error(Msg, false); +} + +void MCContext::reportWarning(SMLoc Loc, const Twine &Msg) { + if (TargetOptions && TargetOptions->MCNoWarn) + return; + if (TargetOptions && TargetOptions->MCFatalWarnings) + reportError(Loc, Msg); + else { + // If we have a source manager use it. Otherwise, try using the inline + // source manager. + if (SrcMgr) + SrcMgr->PrintMessage(Loc, SourceMgr::DK_Warning, Msg); + else if (InlineSrcMgr) + InlineSrcMgr->PrintMessage(Loc, SourceMgr::DK_Warning, Msg); + } +} + +void MCContext::reportFatalError(SMLoc Loc, const Twine &Msg) { + reportError(Loc, Msg); + + // If we reached here, we are failing ungracefully. Run the interrupt handlers + // to make sure any special cleanups get done, in particular that we remove + // files registered with RemoveFileOnSignal. + sys::RunInterruptHandlers(); + exit(1); +} |