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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86251 91177308-0d34-0410-b5e6-96231b3b80d8
160 lines
6.0 KiB
C++
160 lines
6.0 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/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 MCExpr;
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class MCSection;
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class MCSymbol;
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class StringRef;
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class Twine;
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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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/// 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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/// 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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public:
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MCContext();
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~MCContext();
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/// @name Symbol Managment
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/// @{
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/// CreateSymbol - Create a new symbol with the specified @param Name.
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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 *CreateSymbol(StringRef Name);
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/// GetOrCreateSymbol - Lookup the symbol inside with the specified
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/// @param 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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/// @param IsTemporary - Whether this symbol is an assembler temporary,
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/// which should not survive into the symbol table for the translation unit.
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MCSymbol *GetOrCreateSymbol(StringRef Name);
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MCSymbol *GetOrCreateSymbol(const Twine &Name);
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/// CreateTemporarySymbol - Create a new temporary symbol with the specified
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/// @param Name.
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///
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/// @param Name - The symbol name, for debugging purposes only, temporary
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/// symbols do not surive assembly. If non-empty the name must be unique
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/// across all symbols.
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MCSymbol *CreateTemporarySymbol(StringRef Name = "");
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/// LookupSymbol - Get the symbol for @param Name, or null.
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MCSymbol *LookupSymbol(StringRef Name) const;
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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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