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 170064e85050e3a324aa66ee29af56546e0c31f6ccChris Lattner#include "llvm/MC/SectionKind.h" 181f7210e808373fa92be3a2d4fa653a6f79d5088bCraig Topper#include "llvm/Support/Compiler.h" 19ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar 20ed47a0409b187d5dcd2bddfd054326fc809d00aeChris Lattnernamespace llvm { 21af76e592c7f9deff0e55c13dbb4a34f07f1c7f64Chris Lattner class MCAsmInfo; 22892e18239308f8a02a4c83758616be84a459c19dChris Lattner class raw_ostream; 23dd2ad8432f104282ff43c94457f474ea0a264175Mikhail Glushenkov 24a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner /// MCSection - Instances of this class represent a uniqued identifier for a 25a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner /// section in the current translation unit. The MCContext class uniques and 26a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner /// creates these. 27ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar class MCSection { 289a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar public: 299a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar enum SectionVariant { 309a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar SV_COFF = 0, 319a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar SV_ELF, 328b8825ac164c2e7cce8b6987cea78cd8b301360dShih-wei Liao SV_MachO, 338b8825ac164c2e7cce8b6987cea78cd8b301360dShih-wei Liao SV_LDContext 349a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar }; 359a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar 369a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar private: 371f7210e808373fa92be3a2d4fa653a6f79d5088bCraig Topper MCSection(const MCSection&) LLVM_DELETED_FUNCTION; 381f7210e808373fa92be3a2d4fa653a6f79d5088bCraig Topper void operator=(const MCSection&) LLVM_DELETED_FUNCTION; 39ed47a0409b187d5dcd2bddfd054326fc809d00aeChris Lattner protected: 409a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {} 419a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar SectionVariant Variant; 42a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner SectionKind Kind; 43a0faf7ae555eacf75f5a482968b27e447d71c99fChris Lattner public: 44ed47a0409b187d5dcd2bddfd054326fc809d00aeChris Lattner virtual ~MCSection(); 45a11af531ec48ad84f790b9511f003ac5c934a999Daniel Dunbar 46a87dea4f8c546ca748f1777a8d1cabcc06515d91Chris Lattner SectionKind getKind() const { return Kind; } 479a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar 489a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar SectionVariant getVariant() const { return Variant; } 49dd2ad8432f104282ff43c94457f474ea0a264175Mikhail Glushenkov 5033adcfb4d217f5f23d9bde8ba02b8e48f9605fc5Chris Lattner virtual void PrintSwitchToSection(const MCAsmInfo &MAI, 51892e18239308f8a02a4c83758616be84a459c19dChris Lattner raw_ostream &OS) const = 0; 523d2251361171b1a41bdb2ac71882e69d48617f49Chris Lattner 53ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands /// isBaseAddressKnownZero - Return true if we know that this section will 54ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands /// get a base address of zero. In cases where we know that this is true we 55ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands /// can emit section offsets as direct references to avoid a subtraction 56ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands /// from the base of the section, saving a relocation. 57ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands virtual bool isBaseAddressKnownZero() const { 58ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands return false; 59ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands } 60ba9934648f1b8f5b1749548963f385f1147c1f68Duncan Sands 61083cf1574facc9ce468fba1735c794bd7e520108Jan Wen Voung // UseCodeAlign - Return true if a .align directive should use 62083cf1574facc9ce468fba1735c794bd7e520108Jan Wen Voung // "optimized nops" to fill instead of 0s. 63083cf1574facc9ce468fba1735c794bd7e520108Jan Wen Voung virtual bool UseCodeAlign() const = 0; 64083cf1574facc9ce468fba1735c794bd7e520108Jan Wen Voung 65f2dc4aa562e2478a73fe5aeeeec16b1e496a0642Rafael Espindola /// isVirtualSection - Check whether this section is "virtual", that is 66f2dc4aa562e2478a73fe5aeeeec16b1e496a0642Rafael Espindola /// has no actual object file contents. 67f2dc4aa562e2478a73fe5aeeeec16b1e496a0642Rafael Espindola virtual bool isVirtualSection() const = 0; 68f2dc4aa562e2478a73fe5aeeeec16b1e496a0642Rafael Espindola 699a744e38607bc3046dffea56efec0b2dfc51d5e4Daniel Dunbar static bool classof(const MCSection *) { return true; } 70ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar }; 71dd2ad8432f104282ff43c94457f474ea0a264175Mikhail Glushenkov 72ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar} // end namespace llvm 73ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar 74ecc63f8687c4eb746b69336316685fe9b224adfbDaniel Dunbar#endif 75