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-rw-r--r--contrib/llvm/lib/MC/MCContext.cpp501
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diff --git a/contrib/llvm/lib/MC/MCContext.cpp b/contrib/llvm/lib/MC/MCContext.cpp
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+++ b/contrib/llvm/lib/MC/MCContext.cpp
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+//===- lib/MC/MCContext.cpp - Machine Code Context ------------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#include "llvm/MC/MCContext.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/Twine.h"
+#include "llvm/MC/MCAssembler.h"
+#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/MCLabel.h"
+#include "llvm/MC/MCObjectFileInfo.h"
+#include "llvm/MC/MCRegisterInfo.h"
+#include "llvm/MC/MCSectionCOFF.h"
+#include "llvm/MC/MCSectionELF.h"
+#include "llvm/MC/MCSectionMachO.h"
+#include "llvm/MC/MCStreamer.h"
+#include "llvm/MC/MCSymbolCOFF.h"
+#include "llvm/MC/MCSymbolELF.h"
+#include "llvm/MC/MCSymbolMachO.h"
+#include "llvm/Support/COFF.h"
+#include "llvm/Support/ELF.h"
+#include "llvm/Support/ErrorHandling.h"
+#include "llvm/Support/FileSystem.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/Signals.h"
+#include "llvm/Support/SourceMgr.h"
+#include <map>
+
+using namespace llvm;
+
+MCContext::MCContext(const MCAsmInfo *mai, const MCRegisterInfo *mri,
+ const MCObjectFileInfo *mofi, const SourceMgr *mgr,
+ bool DoAutoReset)
+ : SrcMgr(mgr), MAI(mai), MRI(mri), MOFI(mofi), Allocator(),
+ Symbols(Allocator), UsedNames(Allocator),
+ CurrentDwarfLoc(0, 0, 0, DWARF2_FLAG_IS_STMT, 0, 0), DwarfLocSeen(false),
+ GenDwarfForAssembly(false), GenDwarfFileNumber(0), DwarfVersion(4),
+ AllowTemporaryLabels(true), DwarfCompileUnitID(0),
+ AutoReset(DoAutoReset), HadError(false) {
+
+ std::error_code EC = llvm::sys::fs::current_path(CompilationDir);
+ if (EC)
+ CompilationDir.clear();
+
+ SecureLogFile = getenv("AS_SECURE_LOG_FILE");
+ SecureLog = nullptr;
+ SecureLogUsed = false;
+
+ 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();
+
+ MCSubtargetAllocator.DestroyAll();
+ UsedNames.clear();
+ Symbols.clear();
+ SectionSymbols.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);
+
+ MachOUniquingMap.clear();
+ ELFUniquingMap.clear();
+ COFFUniquingMap.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;
+}
+
+MCSymbolELF *MCContext::getOrCreateSectionSymbol(const MCSectionELF &Section) {
+ MCSymbolELF *&Sym = SectionSymbols[&Section];
+ if (Sym)
+ return Sym;
+
+ StringRef Name = Section.getSectionName();
+
+ MCSymbol *&OldSym = Symbols[Name];
+ if (OldSym && OldSym->isUndefined()) {
+ Sym = cast<MCSymbolELF>(OldSym);
+ return Sym;
+ }
+
+ auto NameIter = UsedNames.insert(std::make_pair(Name, true)).first;
+ Sym = new (&*NameIter, *this) MCSymbolELF(&*NameIter, /*isTemporary*/ false);
+
+ if (!OldSym)
+ OldSym = Sym;
+
+ 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);
+ }
+ }
+ 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 an user writter 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];
+ for (;;) {
+ if (AddSuffix) {
+ NewName.resize(Name.size());
+ raw_svector_ostream(NewName) << NextUniqueID++;
+ }
+ auto NameEntry = UsedNames.insert(std::make_pair(NewName, true));
+ if (NameEntry.second) {
+ // Ok, we found a name. 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);
+}
+
+//===----------------------------------------------------------------------===//
+// 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::createELFRelSection(StringRef Name, unsigned Type,
+ unsigned Flags, unsigned EntrySize,
+ const MCSymbolELF *Group,
+ const MCSectionELF *Associated) {
+ StringMap<bool>::iterator I;
+ bool Inserted;
+ std::tie(I, Inserted) = ELFRelSecNames.insert(std::make_pair(Name, true));
+
+ return new (ELFAllocator.Allocate())
+ MCSectionELF(I->getKey(), Type, Flags, SectionKind::getReadOnly(),
+ EntrySize, Group, true, nullptr, Associated);
+}
+
+MCSectionELF *MCContext::getELFSection(StringRef Section, unsigned Type,
+ unsigned Flags, unsigned EntrySize,
+ StringRef Group, unsigned UniqueID,
+ const char *BeginSymName) {
+ MCSymbolELF *GroupSym = nullptr;
+ if (!Group.empty())
+ GroupSym = cast<MCSymbolELF>(getOrCreateSymbol(Group));
+
+ return getELFSection(Section, Type, Flags, EntrySize, GroupSym, UniqueID,
+ BeginSymName, nullptr);
+}
+
+MCSectionELF *MCContext::getELFSection(StringRef Section, unsigned Type,
+ unsigned Flags, unsigned EntrySize,
+ const MCSymbolELF *GroupSym,
+ unsigned UniqueID,
+ const char *BeginSymName,
+ const MCSectionELF *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, Group, UniqueID}, nullptr));
+ auto &Entry = *IterBool.first;
+ if (!IterBool.second)
+ return Entry.second;
+
+ StringRef CachedName = Entry.first.SectionName;
+
+ SectionKind Kind;
+ if (Flags & ELF::SHF_EXECINSTR)
+ Kind = SectionKind::getText();
+ else
+ Kind = SectionKind::getReadOnly();
+
+ MCSymbol *Begin = nullptr;
+ if (BeginSymName)
+ Begin = createTempSymbol(BeginSymName, false);
+
+ MCSectionELF *Result = new (ELFAllocator.Allocate())
+ MCSectionELF(CachedName, Type, Flags, Kind, EntrySize, GroupSym, UniqueID,
+ Begin, Associated);
+ Entry.second = Result;
+ return Result;
+}
+
+MCSectionELF *MCContext::createELFGroupSection(const MCSymbolELF *Group) {
+ MCSectionELF *Result = new (ELFAllocator.Allocate())
+ MCSectionELF(".group", ELF::SHT_GROUP, 0, SectionKind::getReadOnly(), 4,
+ Group, ~0, nullptr, nullptr);
+ return Result;
+}
+
+MCSectionCOFF *MCContext::getCOFFSection(StringRef Section,
+ unsigned Characteristics,
+ SectionKind Kind,
+ StringRef COMDATSymName, int Selection,
+ 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};
+ 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, BeginSymName);
+}
+
+MCSectionCOFF *MCContext::getCOFFSection(StringRef Section) {
+ COFFSectionKey T{Section, "", 0};
+ auto Iter = COFFUniquingMap.find(T);
+ if (Iter == COFFUniquingMap.end())
+ return nullptr;
+ return Iter->second;
+}
+
+MCSectionCOFF *MCContext::getAssociativeCOFFSection(MCSectionCOFF *Sec,
+ const MCSymbol *KeySym) {
+ // Return the normal section if we don't have to be associative.
+ if (!KeySym)
+ return Sec;
+
+ // Make an associative section with the same name and kind as the normal
+ // section.
+ unsigned Characteristics =
+ Sec->getCharacteristics() | COFF::IMAGE_SCN_LNK_COMDAT;
+ return getCOFFSection(Sec->getSectionName(), Characteristics, Sec->getKind(),
+ KeySym->getName(),
+ COFF::IMAGE_COMDAT_SELECT_ASSOCIATIVE);
+}
+
+MCSubtargetInfo &MCContext::getSubtargetCopy(const MCSubtargetInfo &STI) {
+ return *new (MCSubtargetAllocator.Allocate()) MCSubtargetInfo(STI);
+}
+
+//===----------------------------------------------------------------------===//
+// Dwarf Management
+//===----------------------------------------------------------------------===//
+
+/// getDwarfFile - takes a file name an 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.
+unsigned MCContext::getDwarfFile(StringRef Directory, StringRef FileName,
+ unsigned FileNumber, unsigned CUID) {
+ MCDwarfLineTable &Table = MCDwarfLineTablesCUMap[CUID];
+ return Table.getFile(Directory, FileName, 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 SmallVectorImpl<MCDwarfFile> &MCDwarfFiles = getMCDwarfFiles(CUID);
+ if (FileNumber == 0 || FileNumber >= MCDwarfFiles.size())
+ return false;
+
+ return !MCDwarfFiles[FileNumber].Name.empty();
+}
+
+/// Remove empty sections from SectionStartEndSyms, to avoid generating
+/// useless debug info for them.
+void MCContext::finalizeDwarfSections(MCStreamer &MCOS) {
+ SectionsForRanges.remove_if(
+ [&](MCSection *Sec) { return !MCOS.mayHaveInstructions(*Sec); });
+}
+
+//===----------------------------------------------------------------------===//
+// Error Reporting
+//===----------------------------------------------------------------------===//
+
+void MCContext::reportError(SMLoc Loc, const Twine &Msg) {
+ HadError = true;
+
+ // If we have a source manager use it. Otherwise just use the generic
+ // report_fatal_error().
+ if (!SrcMgr)
+ report_fatal_error(Msg, false);
+
+ // Use the source manager to print the message.
+ SrcMgr->PrintMessage(Loc, SourceMgr::DK_Error, 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);
+}
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