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"
25 /// MCSection - Instances of this class represent a uniqued identifier for a
26 /// section in the current translation unit. The MCContext class uniques and
37 MCSection(const MCSection&) LLVM_DELETED_FUNCTION;
38 void operator=(const MCSection&) LLVM_DELETED_FUNCTION;
40 MCSection(SectionVariant V, SectionKind K) : Variant(V), Kind(K) {}
41 SectionVariant Variant;
46 SectionKind getKind() const { return Kind; }
48 SectionVariant getVariant() const { return Variant; }
50 virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
51 raw_ostream &OS) const = 0;
53 // Convenience routines to get label names for the beginning/end of a
55 virtual std::string getLabelBeginName() const = 0;
56 virtual std::string getLabelEndName() const = 0;
58 /// isBaseAddressKnownZero - Return true if we know that this section will
59 /// get a base address of zero. In cases where we know that this is true we
60 /// can emit section offsets as direct references to avoid a subtraction
61 /// from the base of the section, saving a relocation.
62 virtual bool isBaseAddressKnownZero() const {
66 // UseCodeAlign - Return true if a .align directive should use
67 // "optimized nops" to fill instead of 0s.
68 virtual bool UseCodeAlign() const = 0;
70 /// isVirtualSection - Check whether this section is "virtual", that is
71 /// has no actual object file contents.
72 virtual bool isVirtualSection() const = 0;
75 } // end namespace llvm