| //===-- llvm/MC/MCValue.h - MCValue class -----------------------*- 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 MCValue class. |
| // |
| //===----------------------------------------------------------------------===// |
| |
| #ifndef LLVM_MC_MCVALUE_H |
| #define LLVM_MC_MCVALUE_H |
| |
| #include "llvm/Support/DataTypes.h" |
| #include "llvm/MC/MCSymbol.h" |
| #include <cassert> |
| |
| namespace llvm { |
| class MCAsmInfo; |
| class MCSymbol; |
| class MCSymbolRefExpr; |
| class raw_ostream; |
| |
| /// MCValue - This represents an "assembler immediate". In its most general |
| /// form, this can hold "SymbolA - SymbolB + imm64". Not all targets supports |
| /// relocations of this general form, but we need to represent this anyway. |
| /// |
| /// In the general form, SymbolB can only be defined if SymbolA is, and both |
| /// must be in the same (non-external) section. The latter constraint is not |
| /// enforced, since a symbol's section may not be known at construction. |
| /// |
| /// Note that this class must remain a simple POD value class, because we need |
| /// it to live in unions etc. |
| class MCValue { |
| const MCSymbolRefExpr *SymA, *SymB; |
| int64_t Cst; |
| public: |
| |
| int64_t getConstant() const { return Cst; } |
| const MCSymbolRefExpr *getSymA() const { return SymA; } |
| const MCSymbolRefExpr *getSymB() const { return SymB; } |
| |
| /// isAbsolute - Is this an absolute (as opposed to relocatable) value. |
| bool isAbsolute() const { return !SymA && !SymB; } |
| |
| /// print - Print the value to the stream \arg OS. |
| void print(raw_ostream &OS, const MCAsmInfo *MAI) const; |
| |
| /// dump - Print the value to stderr. |
| void dump() const; |
| |
| static MCValue get(const MCSymbolRefExpr *SymA, const MCSymbolRefExpr *SymB=0, |
| int64_t Val = 0) { |
| MCValue R; |
| assert((!SymB || SymA) && "Invalid relocatable MCValue!"); |
| R.Cst = Val; |
| R.SymA = SymA; |
| R.SymB = SymB; |
| return R; |
| } |
| |
| static MCValue get(int64_t Val) { |
| MCValue R; |
| R.Cst = Val; |
| R.SymA = 0; |
| R.SymB = 0; |
| return R; |
| } |
| |
| }; |
| |
| } // end namespace llvm |
| |
| #endif |