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thirdparty/clang/include/llvm/CodeGen/PseudoSourceValue.h

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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 raw_ostream;
+
+  /// 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 : public Value {
+  private:
+    /// printCustom - Implement printing for PseudoSourceValue. This is called
+    /// from Value::print or Value's operator<<.
+    ///
+    virtual void printCustom(raw_ostream &O) const;
+
+  public:
+    explicit PseudoSourceValue(enum ValueTy Subclass = PseudoSourceValueVal);
+
+    /// 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 a LLVM IR Value.
+    virtual bool mayAlias(const MachineFrameInfo *) const;
+
+    /// classof - Methods for support type inquiry through isa, cast, and
+    /// dyn_cast:
+    ///
+    static inline bool classof(const Value *V) {
+      return V->getValueID() == PseudoSourceValueVal ||
+             V->getValueID() == FixedStackPseudoSourceValueVal;
+    }
+
+    /// 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(FixedStackPseudoSourceValueVal), FI(fi) {}
+
+    /// classof - Methods for support type inquiry through isa, cast, and
+    /// dyn_cast:
+    ///
+    static inline bool classof(const Value *V) {
+      return V->getValueID() == FixedStackPseudoSourceValueVal;
+    }
+
+    virtual bool isConstant(const MachineFrameInfo *MFI) const;
+
+    virtual bool isAliased(const MachineFrameInfo *MFI) const;
+
+    virtual bool mayAlias(const MachineFrameInfo *) const;
+
+    virtual void printCustom(raw_ostream &OS) const;
+
+    int getFrameIndex() const { return FI; }
+  };
+} // End llvm namespace
+
+#endif