MCSection.h revision ba9934648f1b8f5b1749548963f385f1147c1f68
1ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar//===- MCSection.h - Machine Code Sections ----------------------*- C++ -*-===// 2ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar// 3ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar// The LLVM Compiler Infrastructure 4ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar// 5ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar// This file is distributed under the University of Illinois Open Source 6ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar// License. See LICENSE.TXT for details. 7ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar// 8ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar//===----------------------------------------------------------------------===// 9a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner// 10a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner// This file declares the MCSection class. 11a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner// 12a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner//===----------------------------------------------------------------------===// 13ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar 14ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar#ifndef LLVM_MC_MCSECTION_H 15ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar#define LLVM_MC_MCSECTION_H 16ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar 17ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar#include <string> 18b5261ebabb215330d6549048b825d236fb3c9b6bDaniel Dunbar#include "llvm/ADT/StringRef.h" 190064e85050e3a324aa66ee29af56546e0c31f6ccChris Lattner#include "llvm/MC/SectionKind.h" 209a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar#include "llvm/Support/Casting.h" 21ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar 22ed47a0409b187d5dcd2bddfd054326fc809d00aeChris Lattnernamespace llvm { 23ed47a0409b187d5dcd2bddfd054326fc809d00aeChris Lattner class MCContext; 24af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner class MCAsmInfo; 25892e18239308f8a02a4c83758616be84a459c19dChris Lattner class raw_ostream; 26dd2ad8432f104282ff43c94457f474ea0a264175Mikhail Glushenkov 27a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner /// MCSection - Instances of this class represent a uniqued identifier for a 28a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner /// section in the current translation unit. The MCContext class uniques and 29a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner /// creates these. 30ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar class MCSection { 319a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar public: 329a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar enum SectionVariant { 339a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar SV_COFF = 0, 349a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar SV_ELF, 3560cb528246dd01b80b1b1260a2a877ea488e620aChris Lattner SV_MachO 369a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar }; 379a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar 389a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar private: 39a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner MCSection(const MCSection&); // DO NOT IMPLEMENT 40a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner void operator=(const MCSection&); // DO NOT IMPLEMENT 41ed47a0409b187d5dcd2bddfd054326fc809d00aeChris Lattner protected: 429a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {} 439a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar SectionVariant Variant; 44a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner SectionKind Kind; 45a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner public: 46ed47a0409b187d5dcd2bddfd054326fc809d00aeChris Lattner virtual ~MCSection(); 47a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar 48a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner SectionKind getKind() const { return Kind; } 499a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar 509a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar SectionVariant getVariant() const { return Variant; } 51dd2ad8432f104282ff43c94457f474ea0a264175Mikhail Glushenkov 5233adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner virtual void PrintSwitchToSection(const MCAsmInfo &MAI, 53892e18239308f8a02a4c83758616be84a459c19dChris Lattner raw_ostream &OS) const = 0; 543d2251361171b1a41bdb2ac71882e69d48617f49Chris Lattner 55ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands /// isBaseAddressKnownZero - Return true if we know that this section will 56ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands /// get a base address of zero. In cases where we know that this is true we 57ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands /// can emit section offsets as direct references to avoid a subtraction 58ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands /// from the base of the section, saving a relocation. 59ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands virtual bool isBaseAddressKnownZero() const { 60ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands return false; 61ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands } 62ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands 63083cf1574facc9ce468fba1735c794bd7e520108Jan Wen Voung // UseCodeAlign - Return true if a .align directive should use 64083cf1574facc9ce468fba1735c794bd7e520108Jan Wen Voung // "optimized nops" to fill instead of 0s. 65083cf1574facc9ce468fba1735c794bd7e520108Jan Wen Voung virtual bool UseCodeAlign() const = 0; 66083cf1574facc9ce468fba1735c794bd7e520108Jan Wen Voung 67f2dc4aa562e2478a73fe5aeeeec16b1e496a0642Rafael Espindola /// isVirtualSection - Check whether this section is "virtual", that is 68f2dc4aa562e2478a73fe5aeeeec16b1e496a0642Rafael Espindola /// has no actual object file contents. 69f2dc4aa562e2478a73fe5aeeeec16b1e496a0642Rafael Espindola virtual bool isVirtualSection() const = 0; 70f2dc4aa562e2478a73fe5aeeeec16b1e496a0642Rafael Espindola 719a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar static bool classof(const MCSection *) { return true; } 72ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar }; 73dd2ad8432f104282ff43c94457f474ea0a264175Mikhail Glushenkov 74ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar} // end namespace llvm 75ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar 76ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar#endif 77