--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/include/llvm/MC/MCContext.h	Thu Dec 12 13:56:28 2013 +0900
@@ -0,0 +1,496 @@
+//===- MCContext.h - Machine Code Context -----------------------*- C++ -*-===//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCCONTEXT_H
+#define LLVM_MC_MCCONTEXT_H
+
+#include "llvm/ADT/DenseMap.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/ADT/SmallVector.h"
+#include "llvm/ADT/StringMap.h"
+#include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/SectionKind.h"
+#include "llvm/Support/Allocator.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/raw_ostream.h"
+#include <map>
+#include <vector> // FIXME: Shouldn't be needed.
+
+namespace llvm {
+  class MCAsmInfo;
+  class MCExpr;
+  class MCSection;
+  class MCSymbol;
+  class MCLabel;
+  class MCDwarfFile;
+  class MCDwarfLoc;
+  class MCObjectFileInfo;
+  class MCRegisterInfo;
+  class MCLineSection;
+  class SMLoc;
+  class StringRef;
+  class Twine;
+  class MCSectionMachO;
+  class MCSectionELF;
+  class MCSectionCOFF;
+
+  /// MCContext - Context object for machine code objects.  This class owns all
+  /// of the sections that it creates.
+  ///
+  class MCContext {
+    MCContext(const MCContext&) LLVM_DELETED_FUNCTION;
+    MCContext &operator=(const MCContext&) LLVM_DELETED_FUNCTION;
+  public:
+    typedef StringMap<MCSymbol*, BumpPtrAllocator&> SymbolTable;
+  private:
+    /// The SourceMgr for this object, if any.
+    const SourceMgr *SrcMgr;
+
+    /// The MCAsmInfo for this target.
+    const MCAsmInfo *MAI;
+
+    /// The MCRegisterInfo for this target.
+    const MCRegisterInfo *MRI;
+
+    /// The MCObjectFileInfo for this target.
+    const MCObjectFileInfo *MOFI;
+
+    /// Allocator - Allocator object used for creating machine code objects.
+    ///
+    /// We use a bump pointer allocator to avoid the need to track all allocated
+    /// objects.
+    BumpPtrAllocator Allocator;
+
+    /// Symbols - Bindings of names to symbols.
+    SymbolTable Symbols;
+
+    /// UsedNames - Keeps tracks of names that were used both for used declared
+    /// and artificial symbols.
+    StringMap<bool, BumpPtrAllocator&> UsedNames;
+
+    /// NextUniqueID - The next ID to dole out to an unnamed assembler temporary
+    /// symbol.
+    unsigned NextUniqueID;
+
+    /// Instances of directional local labels.
+    DenseMap<unsigned, MCLabel *> Instances;
+    /// NextInstance() creates the next instance of the directional local label
+    /// for the LocalLabelVal and adds it to the map if needed.
+    unsigned NextInstance(int64_t LocalLabelVal);
+    /// GetInstance() gets the current instance of the directional local label
+    /// for the LocalLabelVal and adds it to the map if needed.
+    unsigned GetInstance(int64_t LocalLabelVal);
+
+    /// The file name of the log file from the environment variable
+    /// AS_SECURE_LOG_FILE.  Which must be set before the .secure_log_unique
+    /// directive is used or it is an error.
+    char *SecureLogFile;
+    /// The stream that gets written to for the .secure_log_unique directive.
+    raw_ostream *SecureLog;
+    /// Boolean toggled when .secure_log_unique / .secure_log_reset is seen to
+    /// catch errors if .secure_log_unique appears twice without
+    /// .secure_log_reset appearing between them.
+    bool SecureLogUsed;
+
+    /// The compilation directory to use for DW_AT_comp_dir.
+    SmallString<128> CompilationDir;
+
+    /// The main file name if passed in explicitly.
+    std::string MainFileName;
+
+    /// The dwarf file and directory tables from the dwarf .file directive.
+    /// We now emit a line table for each compile unit. To reduce the prologue
+    /// size of each line table, the files and directories used by each compile
+    /// unit are separated.
+    typedef std::map<unsigned, SmallVector<MCDwarfFile *, 4> > MCDwarfFilesMap;
+    MCDwarfFilesMap MCDwarfFilesCUMap;
+    std::map<unsigned, SmallVector<StringRef, 4> > MCDwarfDirsCUMap;
+
+    /// The current dwarf line information from the last dwarf .loc directive.
+    MCDwarfLoc CurrentDwarfLoc;
+    bool DwarfLocSeen;
+
+    /// Generate dwarf debugging info for assembly source files.
+    bool GenDwarfForAssembly;
+
+    /// The current dwarf file number when generate dwarf debugging info for
+    /// assembly source files.
+    unsigned GenDwarfFileNumber;
+
+    /// The default initial text section that we generate dwarf debugging line
+    /// info for when generating dwarf assembly source files.
+    const MCSection *GenDwarfSection;
+    /// Symbols created for the start and end of this section.
+    MCSymbol *GenDwarfSectionStartSym, *GenDwarfSectionEndSym;
+
+    /// The information gathered from labels that will have dwarf label
+    /// entries when generating dwarf assembly source files.
+    std::vector<const MCGenDwarfLabelEntry *> MCGenDwarfLabelEntries;
+
+    /// The string to embed in the debug information for the compile unit, if
+    /// non-empty.
+    StringRef DwarfDebugFlags;
+
+    /// The string to embed in as the dwarf AT_producer for the compile unit, if
+    /// non-empty.
+    StringRef DwarfDebugProducer;
+
+    /// Honor temporary labels, this is useful for debugging semantic
+    /// differences between temporary and non-temporary labels (primarily on
+    /// Darwin).
+    bool AllowTemporaryLabels;
+
+    /// The dwarf line information from the .loc directives for the sections
+    /// with assembled machine instructions have after seeing .loc directives.
+    DenseMap<const MCSection *, MCLineSection *> MCLineSections;
+    /// We need a deterministic iteration order, so we remember the order
+    /// the elements were added.
+    std::vector<const MCSection *> MCLineSectionOrder;
+    /// The Compile Unit ID that we are currently processing.
+    unsigned DwarfCompileUnitID;
+    /// The line table start symbol for each Compile Unit.
+    DenseMap<unsigned, MCSymbol *> MCLineTableSymbols;
+
+    void *MachOUniquingMap, *ELFUniquingMap, *COFFUniquingMap;
+
+    /// Do automatic reset in destructor
+    bool AutoReset;
+
+    MCSymbol *CreateSymbol(StringRef Name);
+
+  public:
+    explicit MCContext(const MCAsmInfo *MAI, const MCRegisterInfo *MRI,
+                       const MCObjectFileInfo *MOFI, const SourceMgr *Mgr = 0,
+                       bool DoAutoReset = true);
+    ~MCContext();
+
+    const SourceMgr *getSourceManager() const { return SrcMgr; }
+
+    const MCAsmInfo *getAsmInfo() const { return MAI; }
+
+    const MCRegisterInfo *getRegisterInfo() const { return MRI; }
+
+    const MCObjectFileInfo *getObjectFileInfo() const { return MOFI; }
+
+    void setAllowTemporaryLabels(bool Value) { AllowTemporaryLabels = Value; }
+
+    /// @name Module Lifetime Management
+    /// @{
+
+    /// reset - return object to right after construction state to prepare
+    /// to process a new module
+    void reset();
+
+    /// @}
+
+    /// @name Symbol Management
+    /// @{
+
+    /// CreateTempSymbol - Create and return a new assembler temporary symbol
+    /// with a unique but unspecified name.
+    MCSymbol *CreateTempSymbol();
+
+    /// getUniqueSymbolID() - Return a unique identifier for use in constructing
+    /// symbol names.
+    unsigned getUniqueSymbolID() { return NextUniqueID++; }
+
+    /// CreateDirectionalLocalSymbol - Create the definition of a directional
+    /// local symbol for numbered label (used for "1:" definitions).
+    MCSymbol *CreateDirectionalLocalSymbol(int64_t LocalLabelVal);
+
+    /// GetDirectionalLocalSymbol - Create and return a directional local
+    /// symbol for numbered label (used for "1b" or 1f" references).
+    MCSymbol *GetDirectionalLocalSymbol(int64_t LocalLabelVal, int bORf);
+
+    /// GetOrCreateSymbol - Lookup the symbol inside with the specified
+    /// @p Name.  If it exists, return it.  If not, create a forward
+    /// reference and return it.
+    ///
+    /// @param Name - The symbol name, which must be unique across all symbols.
+    MCSymbol *GetOrCreateSymbol(StringRef Name);
+    MCSymbol *GetOrCreateSymbol(const Twine &Name);
+
+    /// LookupSymbol - Get the symbol for \p Name, or null.
+    MCSymbol *LookupSymbol(StringRef Name) const;
+    MCSymbol *LookupSymbol(const Twine &Name) const;
+
+    /// getSymbols - Get a reference for the symbol table for clients that
+    /// want to, for example, iterate over all symbols. 'const' because we
+    /// still want any modifications to the table itself to use the MCContext
+    /// APIs.
+    const SymbolTable &getSymbols() const {
+      return Symbols;
+    }
+
+    /// @}
+
+    /// @name Section Management
+    /// @{
+
+    /// getMachOSection - Return the MCSection for the specified mach-o section.
+    /// This requires the operands to be valid.
+    const MCSectionMachO *getMachOSection(StringRef Segment,
+                                          StringRef Section,
+                                          unsigned TypeAndAttributes,
+                                          unsigned Reserved2,
+                                          SectionKind K);
+    const MCSectionMachO *getMachOSection(StringRef Segment,
+                                          StringRef Section,
+                                          unsigned TypeAndAttributes,
+                                          SectionKind K) {
+      return getMachOSection(Segment, Section, TypeAndAttributes, 0, K);
+    }
+
+    const MCSectionELF *getELFSection(StringRef Section, unsigned Type,
+                                      unsigned Flags, SectionKind Kind);
+
+    const MCSectionELF *getELFSection(StringRef Section, unsigned Type,
+                                      unsigned Flags, SectionKind Kind,
+                                      unsigned EntrySize, StringRef Group);
+
+    const MCSectionELF *CreateELFGroupSection();
+
+    const MCSectionCOFF *getCOFFSection(StringRef Section,
+                                        unsigned Characteristics,
+                                        SectionKind Kind,
+                                        StringRef COMDATSymName,
+                                        int Selection,
+                                        const MCSectionCOFF *Assoc = 0);
+
+    const MCSectionCOFF *getCOFFSection(StringRef Section,
+                                        unsigned Characteristics,
+                                        SectionKind Kind);
+
+    const MCSectionCOFF *getCOFFSection(StringRef Section);
+
+    /// @}
+
+    /// @name Dwarf Management
+    /// @{
+
+    /// \brief Get the compilation directory for DW_AT_comp_dir
+    /// This can be overridden by clients which want to control the reported
+    /// compilation directory and have it be something other than the current
+    /// working directory.
+    StringRef getCompilationDir() const { return CompilationDir; }
+
+    /// \brief Set the compilation directory for DW_AT_comp_dir
+    /// Override the default (CWD) compilation directory.
+    void setCompilationDir(StringRef S) { CompilationDir = S.str(); }
+
+    /// \brief Get the main file name for use in error messages and debug
+    /// info. This can be set to ensure we've got the correct file name
+    /// after preprocessing or for -save-temps.
+    const std::string &getMainFileName() const { return MainFileName; }
+
+    /// \brief Set the main file name and override the default.
+    void setMainFileName(StringRef S) { MainFileName = S.str(); }
+
+    /// GetDwarfFile - creates an entry in the dwarf file and directory tables.
+    unsigned GetDwarfFile(StringRef Directory, StringRef FileName,
+                          unsigned FileNumber, unsigned CUID);
+
+    bool isValidDwarfFileNumber(unsigned FileNumber, unsigned CUID = 0);
+
+    bool hasDwarfFiles() const {
+      // Traverse MCDwarfFilesCUMap and check whether each entry is empty.
+      MCDwarfFilesMap::const_iterator MapB, MapE;
+      for (MapB = MCDwarfFilesCUMap.begin(), MapE = MCDwarfFilesCUMap.end();
+           MapB != MapE; MapB++)
+        if (!MapB->second.empty())
+           return true;
+      return false;
+    }
+
+    const SmallVectorImpl<MCDwarfFile *> &getMCDwarfFiles(unsigned CUID = 0) {
+      return MCDwarfFilesCUMap[CUID];
+    }
+    const SmallVectorImpl<StringRef> &getMCDwarfDirs(unsigned CUID = 0) {
+      return MCDwarfDirsCUMap[CUID];
+    }
+
+    const DenseMap<const MCSection *, MCLineSection *>
+    &getMCLineSections() const {
+      return MCLineSections;
+    }
+    const std::vector<const MCSection *> &getMCLineSectionOrder() const {
+      return MCLineSectionOrder;
+    }
+    void addMCLineSection(const MCSection *Sec, MCLineSection *Line) {
+      MCLineSections[Sec] = Line;
+      MCLineSectionOrder.push_back(Sec);
+    }
+    unsigned getDwarfCompileUnitID() {
+      return DwarfCompileUnitID;
+    }
+    void setDwarfCompileUnitID(unsigned CUIndex) {
+      DwarfCompileUnitID = CUIndex;
+    }
+    const DenseMap<unsigned, MCSymbol *> &getMCLineTableSymbols() const {
+      return MCLineTableSymbols;
+    }
+    MCSymbol *getMCLineTableSymbol(unsigned ID) const {
+      DenseMap<unsigned, MCSymbol *>::const_iterator CIter =
+        MCLineTableSymbols.find(ID);
+      if (CIter == MCLineTableSymbols.end())
+        return NULL;
+      return CIter->second;
+    }
+    void setMCLineTableSymbol(MCSymbol *Sym, unsigned ID) {
+      MCLineTableSymbols[ID] = Sym;
+    }
+
+    /// setCurrentDwarfLoc - saves the information from the currently parsed
+    /// dwarf .loc directive and sets DwarfLocSeen.  When the next instruction
+    /// is assembled an entry in the line number table with this information and
+    /// the address of the instruction will be created.
+    void setCurrentDwarfLoc(unsigned FileNum, unsigned Line, unsigned Column,
+                            unsigned Flags, unsigned Isa,
+                            unsigned Discriminator) {
+      CurrentDwarfLoc.setFileNum(FileNum);
+      CurrentDwarfLoc.setLine(Line);
+      CurrentDwarfLoc.setColumn(Column);
+      CurrentDwarfLoc.setFlags(Flags);
+      CurrentDwarfLoc.setIsa(Isa);
+      CurrentDwarfLoc.setDiscriminator(Discriminator);
+      DwarfLocSeen = true;
+    }
+    void ClearDwarfLocSeen() { DwarfLocSeen = false; }
+
+    bool getDwarfLocSeen() { return DwarfLocSeen; }
+    const MCDwarfLoc &getCurrentDwarfLoc() { return CurrentDwarfLoc; }
+
+    bool getGenDwarfForAssembly() { return GenDwarfForAssembly; }
+    void setGenDwarfForAssembly(bool Value) { GenDwarfForAssembly = Value; }
+    unsigned getGenDwarfFileNumber() { return GenDwarfFileNumber; }
+    unsigned nextGenDwarfFileNumber() { return ++GenDwarfFileNumber; }
+    const MCSection *getGenDwarfSection() { return GenDwarfSection; }
+    void setGenDwarfSection(const MCSection *Sec) { GenDwarfSection = Sec; }
+    MCSymbol *getGenDwarfSectionStartSym() { return GenDwarfSectionStartSym; }
+    void setGenDwarfSectionStartSym(MCSymbol *Sym) {
+      GenDwarfSectionStartSym = Sym;
+    }
+    MCSymbol *getGenDwarfSectionEndSym() { return GenDwarfSectionEndSym; }
+    void setGenDwarfSectionEndSym(MCSymbol *Sym) {
+      GenDwarfSectionEndSym = Sym;
+    }
+    const std::vector<const MCGenDwarfLabelEntry *>
+      &getMCGenDwarfLabelEntries() const {
+      return MCGenDwarfLabelEntries;
+    }
+    void addMCGenDwarfLabelEntry(const MCGenDwarfLabelEntry *E) {
+      MCGenDwarfLabelEntries.push_back(E);
+    }
+
+    void setDwarfDebugFlags(StringRef S) { DwarfDebugFlags = S; }
+    StringRef getDwarfDebugFlags() { return DwarfDebugFlags; }
+
+    void setDwarfDebugProducer(StringRef S) { DwarfDebugProducer = S; }
+    StringRef getDwarfDebugProducer() { return DwarfDebugProducer; }
+
+    /// @}
+
+    char *getSecureLogFile() { return SecureLogFile; }
+    raw_ostream *getSecureLog() { return SecureLog; }
+    bool getSecureLogUsed() { return SecureLogUsed; }
+    void setSecureLog(raw_ostream *Value) {
+      SecureLog = Value;
+    }
+    void setSecureLogUsed(bool Value) {
+      SecureLogUsed = Value;
+    }
+
+    void *Allocate(unsigned Size, unsigned Align = 8) {
+      return Allocator.Allocate(Size, Align);
+    }
+    void Deallocate(void *Ptr) {
+    }
+
+    // Unrecoverable error has occurred. Display the best diagnostic we can
+    // and bail via exit(1). For now, most MC backend errors are unrecoverable.
+    // FIXME: We should really do something about that.
+    LLVM_ATTRIBUTE_NORETURN void FatalError(SMLoc L, const Twine &Msg);
+  };
+
+} // end namespace llvm
+
+// operator new and delete aren't allowed inside namespaces.
+// The throw specifications are mandated by the standard.
+/// @brief Placement new for using the MCContext's allocator.
+///
+/// This placement form of operator new uses the MCContext's allocator for
+/// obtaining memory. It is a non-throwing new, which means that it returns
+/// null on error. (If that is what the allocator does. The current does, so if
+/// this ever changes, this operator will have to be changed, too.)
+/// Usage looks like this (assuming there's an MCContext 'Context' in scope):
+/// @code
+/// // Default alignment (16)
+/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments);
+/// // Specific alignment
+/// IntegerLiteral *Ex2 = new (Context, 8) IntegerLiteral(arguments);
+/// @endcode
+/// Please note that you cannot use delete on the pointer; it must be
+/// deallocated using an explicit destructor call followed by
+/// @c Context.Deallocate(Ptr).
+///
+/// @param Bytes The number of bytes to allocate. Calculated by the compiler.
+/// @param C The MCContext that provides the allocator.
+/// @param Alignment The alignment of the allocated memory (if the underlying
+///                  allocator supports it).
+/// @return The allocated memory. Could be NULL.
+inline void *operator new(size_t Bytes, llvm::MCContext &C,
+                          size_t Alignment = 16) throw () {
+  return C.Allocate(Bytes, Alignment);
+}
+/// @brief Placement delete companion to the new above.
+///
+/// This operator is just a companion to the new above. There is no way of
+/// invoking it directly; see the new operator for more details. This operator
+/// is called implicitly by the compiler if a placement new expression using
+/// the MCContext throws in the object constructor.
+inline void operator delete(void *Ptr, llvm::MCContext &C, size_t)
+              throw () {
+  C.Deallocate(Ptr);
+}
+
+/// This placement form of operator new[] uses the MCContext's allocator for
+/// obtaining memory. It is a non-throwing new[], which means that it returns
+/// null on error.
+/// Usage looks like this (assuming there's an MCContext 'Context' in scope):
+/// @code
+/// // Default alignment (16)
+/// char *data = new (Context) char[10];
+/// // Specific alignment
+/// char *data = new (Context, 8) char[10];
+/// @endcode
+/// Please note that you cannot use delete on the pointer; it must be
+/// deallocated using an explicit destructor call followed by
+/// @c Context.Deallocate(Ptr).
+///
+/// @param Bytes The number of bytes to allocate. Calculated by the compiler.
+/// @param C The MCContext that provides the allocator.
+/// @param Alignment The alignment of the allocated memory (if the underlying
+///                  allocator supports it).
+/// @return The allocated memory. Could be NULL.
+inline void *operator new[](size_t Bytes, llvm::MCContext& C,
+                            size_t Alignment = 16) throw () {
+  return C.Allocate(Bytes, Alignment);
+}
+
+/// @brief Placement delete[] companion to the new[] above.
+///
+/// This operator is just a companion to the new[] above. There is no way of
+/// invoking it directly; see the new[] operator for more details. This operator
+/// is called implicitly by the compiler if a placement new[] expression using
+/// the MCContext throws in the object constructor.
+inline void operator delete[](void *Ptr, llvm::MCContext &C) throw () {
+  C.Deallocate(Ptr);
+}
+
+#endif