1 //===- MCSection.h - Machine Code Sections ----------------------*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This file declares the MCSection class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_MC_MCSECTION_H
15 #define LLVM_MC_MCSECTION_H
18 #include "llvm/ADT/StringRef.h"
19 #include "llvm/MC/SectionKind.h"
20 #include "llvm/Support/Casting.h"
27 /// MCSection - Instances of this class represent a uniqued identifier for a
28 /// section in the current translation unit. The MCContext class uniques and
39 MCSection(const MCSection&); // DO NOT IMPLEMENT
40 void operator=(const MCSection&); // DO NOT IMPLEMENT
42 MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {}
43 SectionVariant Variant;
48 SectionKind getKind() const { return Kind; }
50 SectionVariant getVariant() const { return Variant; }
52 virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
53 raw_ostream &OS) const = 0;
55 /// isBaseAddressKnownZero - Return true if we know that this section will
56 /// get a base address of zero. In cases where we know that this is true we
57 /// can emit section offsets as direct references to avoid a subtraction
58 /// from the base of the section, saving a relocation.
59 virtual bool isBaseAddressKnownZero() const {
63 // UseCodeAlign - Return true if a .align directive should use
64 // "optimized nops" to fill instead of 0s.
65 virtual bool UseCodeAlign() const = 0;
67 /// isVirtualSection - Check whether this section is "virtual", that is
68 /// has no actual object file contents.
69 virtual bool isVirtualSection() const = 0;
71 static bool classof(const MCSection *) { return true; }
74 } // end namespace llvm