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213 lines
8.1 KiB
C++
213 lines
8.1 KiB
C++
//===- MCContext.h - Machine Code Context -----------------------*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_MCCONTEXT_H
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#define LLVM_MC_MCCONTEXT_H
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#include "llvm/MC/SectionKind.h"
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#include "llvm/ADT/DenseMap.h"
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#include "llvm/ADT/StringMap.h"
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#include "llvm/Support/Allocator.h"
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namespace llvm {
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class MCAsmInfo;
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class MCExpr;
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class MCSection;
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class MCSymbol;
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class MCLabel;
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class StringRef;
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class Twine;
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class MCSectionMachO;
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/// MCContext - Context object for machine code objects. This class owns all
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/// of the sections that it creates.
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///
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class MCContext {
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MCContext(const MCContext&); // DO NOT IMPLEMENT
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MCContext &operator=(const MCContext&); // DO NOT IMPLEMENT
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/// The MCAsmInfo for this target.
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const MCAsmInfo &MAI;
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/// Sections - Bindings of names to allocated sections.
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StringMap<MCSection*> Sections;
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/// Symbols - Bindings of names to symbols.
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StringMap<MCSymbol*> Symbols;
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/// NextUniqueID - The next ID to dole out to an unnamed assembler temporary
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/// symbol.
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unsigned NextUniqueID;
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/// Instances of directional local labels.
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DenseMap<unsigned, MCLabel *> Instances;
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/// NextInstance() creates the next instance of the directional local label
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/// for the LocalLabelVal and adds it to the map if needed.
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unsigned NextInstance(int64_t LocalLabelVal);
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/// GetInstance() gets the current instance of the directional local label
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/// for the LocalLabelVal and adds it to the map if needed.
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unsigned GetInstance(int64_t LocalLabelVal);
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/// Allocator - Allocator object used for creating machine code objects.
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///
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/// We use a bump pointer allocator to avoid the need to track all allocated
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/// objects.
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BumpPtrAllocator Allocator;
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void *MachOUniquingMap, *ELFUniquingMap, *COFFUniquingMap;
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public:
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explicit MCContext(const MCAsmInfo &MAI);
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~MCContext();
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const MCAsmInfo &getAsmInfo() const { return MAI; }
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/// @name Symbol Managment
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/// @{
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/// CreateTempSymbol - Create and return a new assembler temporary symbol
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/// with a unique but unspecified name.
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MCSymbol *CreateTempSymbol();
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/// CreateDirectionalLocalSymbol - Create the defintion of a directional
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/// local symbol for numbered label (used for "1:" defintions).
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MCSymbol *CreateDirectionalLocalSymbol(int64_t LocalLabelVal);
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/// GetDirectionalLocalSymbol - Create and return a directional local
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/// symbol for numbered label (used for "1b" or 1f" references).
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MCSymbol *GetDirectionalLocalSymbol(int64_t LocalLabelVal, int bORf);
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/// GetOrCreateSymbol - Lookup the symbol inside with the specified
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/// @p Name. If it exists, return it. If not, create a forward
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/// reference and return it.
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///
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/// @param Name - The symbol name, which must be unique across all symbols.
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MCSymbol *GetOrCreateSymbol(StringRef Name);
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MCSymbol *GetOrCreateSymbol(const Twine &Name);
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/// LookupSymbol - Get the symbol for \p Name, or null.
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MCSymbol *LookupSymbol(StringRef Name) const;
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/// @}
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/// @name Section Managment
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/// @{
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/// getMachOSection - Return the MCSection for the specified mach-o section.
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/// This requires the operands to be valid.
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const MCSectionMachO *getMachOSection(StringRef Segment,
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StringRef Section,
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unsigned TypeAndAttributes,
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unsigned Reserved2,
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SectionKind K);
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const MCSectionMachO *getMachOSection(StringRef Segment,
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StringRef Section,
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unsigned TypeAndAttributes,
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SectionKind K) {
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return getMachOSection(Segment, Section, TypeAndAttributes, 0, K);
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}
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const MCSection *getELFSection(StringRef Section, unsigned Type,
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unsigned Flags, SectionKind Kind,
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bool IsExplicit = false);
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const MCSection *getCOFFSection(StringRef Section, unsigned Characteristics,
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int Selection, SectionKind Kind);
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const MCSection *getCOFFSection(StringRef Section, unsigned Characteristics,
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SectionKind Kind) {
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return getCOFFSection (Section, Characteristics, 0, Kind);
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}
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/// @}
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void *Allocate(unsigned Size, unsigned Align = 8) {
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return Allocator.Allocate(Size, Align);
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}
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void Deallocate(void *Ptr) {
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}
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};
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} // end namespace llvm
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// operator new and delete aren't allowed inside namespaces.
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// The throw specifications are mandated by the standard.
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/// @brief Placement new for using the MCContext's allocator.
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///
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/// This placement form of operator new uses the MCContext's allocator for
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/// obtaining memory. It is a non-throwing new, which means that it returns
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/// null on error. (If that is what the allocator does. The current does, so if
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/// this ever changes, this operator will have to be changed, too.)
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/// Usage looks like this (assuming there's an MCContext 'Context' in scope):
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/// @code
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/// // Default alignment (16)
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/// IntegerLiteral *Ex = new (Context) IntegerLiteral(arguments);
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/// // Specific alignment
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/// IntegerLiteral *Ex2 = new (Context, 8) IntegerLiteral(arguments);
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/// @endcode
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/// Please note that you cannot use delete on the pointer; it must be
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/// deallocated using an explicit destructor call followed by
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/// @c Context.Deallocate(Ptr).
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///
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/// @param Bytes The number of bytes to allocate. Calculated by the compiler.
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/// @param C The MCContext that provides the allocator.
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/// @param Alignment The alignment of the allocated memory (if the underlying
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/// allocator supports it).
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/// @return The allocated memory. Could be NULL.
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inline void *operator new(size_t Bytes, llvm::MCContext &C,
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size_t Alignment = 16) throw () {
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return C.Allocate(Bytes, Alignment);
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}
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/// @brief Placement delete companion to the new above.
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///
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/// This operator is just a companion to the new above. There is no way of
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/// invoking it directly; see the new operator for more details. This operator
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/// is called implicitly by the compiler if a placement new expression using
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/// the MCContext throws in the object constructor.
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inline void operator delete(void *Ptr, llvm::MCContext &C, size_t)
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throw () {
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C.Deallocate(Ptr);
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}
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/// This placement form of operator new[] uses the MCContext's allocator for
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/// obtaining memory. It is a non-throwing new[], which means that it returns
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/// null on error.
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/// Usage looks like this (assuming there's an MCContext 'Context' in scope):
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/// @code
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/// // Default alignment (16)
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/// char *data = new (Context) char[10];
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/// // Specific alignment
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/// char *data = new (Context, 8) char[10];
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/// @endcode
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/// Please note that you cannot use delete on the pointer; it must be
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/// deallocated using an explicit destructor call followed by
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/// @c Context.Deallocate(Ptr).
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///
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/// @param Bytes The number of bytes to allocate. Calculated by the compiler.
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/// @param C The MCContext that provides the allocator.
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/// @param Alignment The alignment of the allocated memory (if the underlying
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/// allocator supports it).
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/// @return The allocated memory. Could be NULL.
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inline void *operator new[](size_t Bytes, llvm::MCContext& C,
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size_t Alignment = 16) throw () {
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return C.Allocate(Bytes, Alignment);
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}
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/// @brief Placement delete[] companion to the new[] above.
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///
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/// This operator is just a companion to the new[] above. There is no way of
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/// invoking it directly; see the new[] operator for more details. This operator
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/// is called implicitly by the compiler if a placement new[] expression using
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/// the MCContext throws in the object constructor.
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inline void operator delete[](void *Ptr, llvm::MCContext &C) throw () {
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C.Deallocate(Ptr);
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}
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#endif
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