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114 lines
4.3 KiB
C++
114 lines
4.3 KiB
C++
//==- llvm/CodeGen/MachineMemOperand.h - MachineMemOperand class -*- 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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//
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// This file contains the declaration of the MachineMemOperand class, which is a
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// description of a memory reference. It is used to help track dependencies
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// in the backend.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_CODEGEN_MACHINEMEMOPERAND_H
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#define LLVM_CODEGEN_MACHINEMEMOPERAND_H
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#include "llvm/System/DataTypes.h"
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namespace llvm {
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class Value;
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class FoldingSetNodeID;
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class raw_ostream;
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//===----------------------------------------------------------------------===//
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/// MachineMemOperand - A description of a memory reference used in the backend.
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/// Instead of holding a StoreInst or LoadInst, this class holds the address
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/// Value of the reference along with a byte size and offset. This allows it
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/// to describe lowered loads and stores. Also, the special PseudoSourceValue
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/// objects can be used to represent loads and stores to memory locations
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/// that aren't explicit in the regular LLVM IR.
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///
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class MachineMemOperand {
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int64_t Offset;
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uint64_t Size;
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const Value *V;
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unsigned int Flags;
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public:
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/// Flags values. These may be or'd together.
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enum MemOperandFlags {
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/// The memory access reads data.
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MOLoad = 1,
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/// The memory access writes data.
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MOStore = 2,
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/// The memory access is volatile.
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MOVolatile = 4,
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/// The memory access is non-temporal.
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MONonTemporal = 8,
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// This is the number of bits we need to represent flags.
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MOMaxBits = 4
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};
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/// MachineMemOperand - Construct an MachineMemOperand object with the
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/// specified address Value, flags, offset, size, and base alignment.
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MachineMemOperand(const Value *v, unsigned int f, int64_t o, uint64_t s,
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unsigned int base_alignment);
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/// getValue - Return the base address of the memory access. This may either
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/// be a normal LLVM IR Value, or one of the special values used in CodeGen.
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/// Special values are those obtained via
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/// PseudoSourceValue::getFixedStack(int), PseudoSourceValue::getStack, and
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/// other PseudoSourceValue member functions which return objects which stand
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/// for frame/stack pointer relative references and other special references
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/// which are not representable in the high-level IR.
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const Value *getValue() const { return V; }
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/// getFlags - Return the raw flags of the source value, \see MemOperandFlags.
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unsigned int getFlags() const { return Flags & ((1 << MOMaxBits) - 1); }
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/// getOffset - For normal values, this is a byte offset added to the base
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/// address. For PseudoSourceValue::FPRel values, this is the FrameIndex
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/// number.
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int64_t getOffset() const { return Offset; }
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/// getSize - Return the size in bytes of the memory reference.
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uint64_t getSize() const { return Size; }
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/// getAlignment - Return the minimum known alignment in bytes of the
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/// actual memory reference.
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uint64_t getAlignment() const;
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/// getBaseAlignment - Return the minimum known alignment in bytes of the
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/// base address, without the offset.
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uint64_t getBaseAlignment() const { return (1u << (Flags >> MOMaxBits)) >> 1; }
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bool isLoad() const { return Flags & MOLoad; }
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bool isStore() const { return Flags & MOStore; }
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bool isVolatile() const { return Flags & MOVolatile; }
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bool isNonTemporal() const { return Flags & MONonTemporal; }
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/// refineAlignment - Update this MachineMemOperand to reflect the alignment
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/// of MMO, if it has a greater alignment. This must only be used when the
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/// new alignment applies to all users of this MachineMemOperand.
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void refineAlignment(const MachineMemOperand *MMO);
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/// setValue - Change the SourceValue for this MachineMemOperand. This
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/// should only be used when an object is being relocated and all references
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/// to it are being updated.
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void setValue(const Value *NewSV) { V = NewSV; }
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/// Profile - Gather unique data for the object.
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///
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void Profile(FoldingSetNodeID &ID) const;
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};
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raw_ostream &operator<<(raw_ostream &OS, const MachineMemOperand &MRO);
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} // End llvm namespace
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#endif
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