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//===-- llvm/CodeGen/PseudoSourceValue.h ------------------------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file contains the declaration of the PseudoSourceValue class.
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_CODEGEN_PSEUDOSOURCEVALUE_H
#define LLVM_CODEGEN_PSEUDOSOURCEVALUE_H
#include "llvm/IR/Value.h"
namespace llvm {
class MachineFrameInfo;
class MachineMemOperand;
class raw_ostream;
raw_ostream &operator<<(raw_ostream &OS, const MachineMemOperand &MMO);
/// PseudoSourceValue - Special value supplied for machine level alias
/// analysis. It indicates that a memory access references the functions
/// stack frame (e.g., a spill slot), below the stack frame (e.g., argument
/// space), or constant pool.
class PseudoSourceValue {
private:
friend class MachineMemOperand; // For printCustom().
/// printCustom - Implement printing for PseudoSourceValue. This is called
/// from Value::print or Value's operator<<.
///
virtual void printCustom(raw_ostream &O) const;
public:
/// isFixed - Whether this is a FixedStackPseudoSourceValue.
bool isFixed;
explicit PseudoSourceValue(bool isFixed = false);
virtual ~PseudoSourceValue();
/// isConstant - Test whether the memory pointed to by this
/// PseudoSourceValue has a constant value.
///
virtual bool isConstant(const MachineFrameInfo *) const;
/// isAliased - Test whether the memory pointed to by this
/// PseudoSourceValue may also be pointed to by an LLVM IR Value.
virtual bool isAliased(const MachineFrameInfo *) const;
/// mayAlias - Return true if the memory pointed to by this
/// PseudoSourceValue can ever alias an LLVM IR Value.
virtual bool mayAlias(const MachineFrameInfo *) const;
/// A pseudo source value referencing a fixed stack frame entry,
/// e.g., a spill slot.
static const PseudoSourceValue *getFixedStack(int FI);
/// A pseudo source value referencing the area below the stack frame of
/// a function, e.g., the argument space.
static const PseudoSourceValue *getStack();
/// A pseudo source value referencing the global offset table
/// (or something the like).
static const PseudoSourceValue *getGOT();
/// A pseudo source value referencing the constant pool. Since constant
/// pools are constant, this doesn't need to identify a specific constant
/// pool entry.
static const PseudoSourceValue *getConstantPool();
/// A pseudo source value referencing a jump table. Since jump tables are
/// constant, this doesn't need to identify a specific jump table.
static const PseudoSourceValue *getJumpTable();
};
/// FixedStackPseudoSourceValue - A specialized PseudoSourceValue
/// for holding FixedStack values, which must include a frame
/// index.
class FixedStackPseudoSourceValue : public PseudoSourceValue {
const int FI;
public:
explicit FixedStackPseudoSourceValue(int fi) :
PseudoSourceValue(true), FI(fi) {}
/// classof - Methods for support type inquiry through isa, cast, and
/// dyn_cast:
///
static inline bool classof(const PseudoSourceValue *V) {
return V->isFixed == true;
}
bool isConstant(const MachineFrameInfo *MFI) const override;
bool isAliased(const MachineFrameInfo *MFI) const override;
bool mayAlias(const MachineFrameInfo *) const override;
void printCustom(raw_ostream &OS) const override;
int getFrameIndex() const { return FI; }
};
} // End llvm namespace
#endif
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