1a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner//===-- llvm/MC/MCValue.h - MCValue class -----------------------*- C++ -*-===// 235d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner// 335d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner// The LLVM Compiler Infrastructure 435d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner// 535d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner// This file is distributed under the University of Illinois Open Source 635d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner// License. See LICENSE.TXT for details. 735d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner// 835d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner//===----------------------------------------------------------------------===// 935d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner// 10a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner// This file contains the declaration of the MCValue class. 1135d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner// 1235d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner//===----------------------------------------------------------------------===// 1335d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner 14a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner#ifndef LLVM_MC_MCVALUE_H 15a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner#define LLVM_MC_MCVALUE_H 1635d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner 171f6efa3996dd1929fbc129203ce5009b620e6969Michael J. Spencer#include "llvm/Support/DataTypes.h" 1815d170709608e2f1efcada74c297c10c8c71fdcfDaniel Dunbar#include "llvm/MC/MCSymbol.h" 1915d170709608e2f1efcada74c297c10c8c71fdcfDaniel Dunbar#include <cassert> 20dcee6847555373c6f352370042486ef904a3d55bBill Wendling 2135d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattnernamespace llvm { 2210b318bcb39218d2ed525e4862c854bc8d1baf63Chris Lattnerclass MCAsmInfo; 239a1d20042f6a6ec648a3588f9b13264a4570aab0Daniel Dunbarclass MCSymbol; 249a1d20042f6a6ec648a3588f9b13264a4570aab0Daniel Dunbarclass MCSymbolRefExpr; 252c11624b65a65fe487f335603dc0bf6372a50a89Daniel Dunbarclass raw_ostream; 2635d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner 27a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner/// MCValue - This represents an "assembler immediate". In its most general 28a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner/// form, this can hold "SymbolA - SymbolB + imm64". Not all targets supports 2935d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner/// relocations of this general form, but we need to represent this anyway. 30a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner/// 3115d170709608e2f1efcada74c297c10c8c71fdcfDaniel Dunbar/// In the general form, SymbolB can only be defined if SymbolA is, and both 32374d8bddacbffce7c82ce81103d30b5ee42032dfDaniel Dunbar/// must be in the same (non-external) section. The latter constraint is not 33374d8bddacbffce7c82ce81103d30b5ee42032dfDaniel Dunbar/// enforced, since a symbol's section may not be known at construction. 3415d170709608e2f1efcada74c297c10c8c71fdcfDaniel Dunbar/// 35a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner/// Note that this class must remain a simple POD value class, because we need 36a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner/// it to live in unions etc. 37a33ccc795659919b2c0d8575a704821eb1972149Chris Lattnerclass MCValue { 389a1d20042f6a6ec648a3588f9b13264a4570aab0Daniel Dunbar const MCSymbolRefExpr *SymA, *SymB; 3935d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner int64_t Cst; 4035d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattnerpublic: 4135d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner 427908a6a189d12c38269df2891a24382525d00591Daniel Dunbar int64_t getConstant() const { return Cst; } 439a1d20042f6a6ec648a3588f9b13264a4570aab0Daniel Dunbar const MCSymbolRefExpr *getSymA() const { return SymA; } 449a1d20042f6a6ec648a3588f9b13264a4570aab0Daniel Dunbar const MCSymbolRefExpr *getSymB() const { return SymB; } 457908a6a189d12c38269df2891a24382525d00591Daniel Dunbar 4680f62d0062a6008403eb889c35fa19939c5c50cfDaniel Dunbar /// isAbsolute - Is this an absolute (as opposed to relocatable) value. 4780f62d0062a6008403eb889c35fa19939c5c50cfDaniel Dunbar bool isAbsolute() const { return !SymA && !SymB; } 4815d170709608e2f1efcada74c297c10c8c71fdcfDaniel Dunbar 492c11624b65a65fe487f335603dc0bf6372a50a89Daniel Dunbar /// print - Print the value to the stream \arg OS. 50684c593d05db0bd277268fc9d8c05bce138c745aChris Lattner void print(raw_ostream &OS, const MCAsmInfo *MAI) const; 519a1d20042f6a6ec648a3588f9b13264a4570aab0Daniel Dunbar 522c11624b65a65fe487f335603dc0bf6372a50a89Daniel Dunbar /// dump - Print the value to stderr. 532c11624b65a65fe487f335603dc0bf6372a50a89Daniel Dunbar void dump() const; 542c11624b65a65fe487f335603dc0bf6372a50a89Daniel Dunbar 559a1d20042f6a6ec648a3588f9b13264a4570aab0Daniel Dunbar static MCValue get(const MCSymbolRefExpr *SymA, const MCSymbolRefExpr *SymB=0, 56d644c32a52c36c2e52c91512d156d4332772cb1fDaniel Dunbar int64_t Val = 0) { 57a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner MCValue R; 58374d8bddacbffce7c82ce81103d30b5ee42032dfDaniel Dunbar assert((!SymB || SymA) && "Invalid relocatable MCValue!"); 5935d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner R.Cst = Val; 6035d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner R.SymA = SymA; 6135d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner R.SymB = SymB; 6235d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner return R; 6335d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner } 649a1d20042f6a6ec648a3588f9b13264a4570aab0Daniel Dunbar 65a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner static MCValue get(int64_t Val) { 66a33ccc795659919b2c0d8575a704821eb1972149Chris Lattner MCValue R; 6735d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner R.Cst = Val; 6835d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner R.SymA = 0; 6935d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner R.SymB = 0; 7035d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner return R; 7135d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner } 729a1d20042f6a6ec648a3588f9b13264a4570aab0Daniel Dunbar 7335d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner}; 7435d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner 7535d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner} // end namespace llvm 7635d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner 7735d0e8793737201d9e24f8944f0ead5636a695f4Chris Lattner#endif 78