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82 lines
3.1 KiB
C++
82 lines
3.1 KiB
C++
//===-- CodeGen/MachineConstantPool.h - Abstract Constant Pool --*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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/// @file This file declares the MachineConstantPool class which is an abstract
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/// constant pool to keep track of constants referenced by a function.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINECONSTANTPOOL_H
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#define LLVM_CODEGEN_MACHINECONSTANTPOOL_H
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#include <vector>
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#include <iosfwd>
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namespace llvm {
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class Constant;
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class TargetData;
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/// This class is a data container for one entry in a MachineConstantPool.
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/// It contains a pointer to the value and an offset from the start of
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/// the constant pool.
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/// @brief An entry in a MachineConstantPool
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struct MachineConstantPoolEntry {
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Constant *Val; ///< The constant itself.
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unsigned Offset; ///< The offset of the constant from the start of the pool.
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MachineConstantPoolEntry(Constant *V, unsigned O) : Val(V), Offset(O) {}
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};
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/// The MachineConstantPool class keeps track of constants referenced by a
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/// function which must be spilled to memory. This is used for constants which
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/// are unable to be used directly as operands to instructions, which typically
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/// include floating point and large integer constants.
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///
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/// Instructions reference the address of these constant pool constants through
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/// the use of MO_ConstantPoolIndex values. When emitting assembly or machine
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/// code, these virtual address references are converted to refer to the
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/// address of the function constant pool values.
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/// @brief The machine constant pool.
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class MachineConstantPool {
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const TargetData *TD; ///< The machine's TargetData.
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unsigned PoolAlignment; ///< The alignment for the pool.
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std::vector<MachineConstantPoolEntry> Constants; ///< The pool of constants.
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public:
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/// @brief The only constructor.
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MachineConstantPool(const TargetData *td) : TD(td), PoolAlignment(1) {}
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/// getConstantPoolAlignment - Return the log2 of the alignment required by
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/// the whole constant pool, of which the first element must be aligned.
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unsigned getConstantPoolAlignment() const { return PoolAlignment; }
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/// getConstantPoolIndex - Create a new entry in the constant pool or return
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/// an existing one. User must specify an alignment in bytes for the object.
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unsigned getConstantPoolIndex(Constant *C, unsigned Alignment);
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/// isEmpty - Return true if this constant pool contains no constants.
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bool isEmpty() const { return Constants.empty(); }
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const std::vector<MachineConstantPoolEntry> &getConstants() const {
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return Constants;
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}
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/// print - Used by the MachineFunction printer to print information about
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/// constant pool objects. Implemented in MachineFunction.cpp
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///
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void print(std::ostream &OS) const;
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/// dump - Call print(std::cerr) to be called from the debugger.
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///
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void dump() const;
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};
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} // End llvm namespace
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#endif
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