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
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/MC/SectionKind.h"
19 #include "llvm/Support/Compiler.h"
26 /// MCSection - Instances of this class represent a uniqued identifier for a
27 /// section in the current translation unit. The MCContext class uniques and
38 MCSection(const MCSection&) = delete;
39 void operator=(const MCSection&) = delete;
41 MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {}
42 SectionVariant Variant;
47 SectionKind getKind() const { return Kind; }
49 SectionVariant getVariant() const { return Variant; }
51 virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
53 const MCExpr *Subsection) const = 0;
55 // Convenience routines to get label names for the beginning/end of a
57 virtual std::string getLabelBeginName() const = 0;
59 /// isBaseAddressKnownZero - Return true if we know that this section will
60 /// get a base address of zero. In cases where we know that this is true we
61 /// can emit section offsets as direct references to avoid a subtraction
62 /// from the base of the section, saving a relocation.
63 virtual bool isBaseAddressKnownZero() const {
67 // UseCodeAlign - Return true if a .align directive should use
68 // "optimized nops" to fill instead of 0s.
69 virtual bool UseCodeAlign() const = 0;
71 /// isVirtualSection - Check whether this section is "virtual", that is
72 /// has no actual object file contents.
73 virtual bool isVirtualSection() const = 0;
76 } // end namespace llvm