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241 lines
8.9 KiB
C++
241 lines
8.9 KiB
C++
//===-- llvm/Target/TargetLoweringObjectFile.h - Object Info ----*- C++ -*-===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This file implements classes used to handle lowerings specific to common
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// object file formats.
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//
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_MC_SECTIONKIND_H
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#define LLVM_MC_SECTIONKIND_H
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namespace llvm {
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/// SectionKind - This is a simple POD value that classifies the properties of
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/// a section. A section is classified into the deepest possible
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/// classification, and then the target maps them onto their sections based on
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/// what capabilities they have.
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///
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/// The comments below describe these as if they were an inheritance hierarchy
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/// in order to explain the predicates below.
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///
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class SectionKind {
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enum Kind {
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/// Metadata - Debug info sections or other metadata.
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Metadata,
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/// Text - Text section, used for functions and other executable code.
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Text,
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/// ReadOnly - Data that is never written to at program runtime by the
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/// program or the dynamic linker. Things in the top-level readonly
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/// SectionKind are not mergeable.
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ReadOnly,
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/// MergableCString - Any null-terminated string which allows merging.
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/// These values are known to end in a nul value of the specified size,
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/// not otherwise contain a nul value, and be mergable. This allows the
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/// linker to unique the strings if it so desires.
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/// Mergeable1ByteCString - 1 byte mergable, null terminated, string.
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Mergeable1ByteCString,
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/// Mergeable2ByteCString - 2 byte mergable, null terminated, string.
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Mergeable2ByteCString,
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/// Mergeable4ByteCString - 4 byte mergable, null terminated, string.
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Mergeable4ByteCString,
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/// MergeableConst - These are sections for merging fixed-length
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/// constants together. For example, this can be used to unique
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/// constant pool entries etc.
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MergeableConst,
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/// MergeableConst4 - This is a section used by 4-byte constants,
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/// for example, floats.
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MergeableConst4,
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/// MergeableConst8 - This is a section used by 8-byte constants,
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/// for example, doubles.
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MergeableConst8,
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/// MergeableConst16 - This is a section used by 16-byte constants,
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/// for example, vectors.
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MergeableConst16,
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/// Writeable - This is the base of all segments that need to be written
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/// to during program runtime.
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/// ThreadLocal - This is the base of all TLS segments. All TLS
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/// objects must be writeable, otherwise there is no reason for them to
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/// be thread local!
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/// ThreadBSS - Zero-initialized TLS data objects.
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ThreadBSS,
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/// ThreadData - Initialized TLS data objects.
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ThreadData,
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/// GlobalWriteableData - Writeable data that is global (not thread
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/// local).
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/// BSS - Zero initialized writeable data.
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BSS,
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/// BSSLocal - This is BSS (zero initialized and writable) data
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/// which has local linkage.
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BSSLocal,
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/// BSSExtern - This is BSS data with normal external linkage.
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BSSExtern,
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/// Common - Data with common linkage. These represent tentative
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/// definitions, which always have a zero initializer and are never
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/// marked 'constant'.
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Common,
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/// DataRel - This is the most general form of data that is written
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/// to by the program, it can have random relocations to arbitrary
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/// globals.
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DataRel,
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/// DataRelLocal - This is writeable data that has a non-zero
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/// initializer and has relocations in it, but all of the
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/// relocations are known to be within the final linked image
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/// the global is linked into.
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DataRelLocal,
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/// DataNoRel - This is writeable data that has a non-zero
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/// initializer, but whose initializer is known to have no
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/// relocations.
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DataNoRel,
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/// ReadOnlyWithRel - These are global variables that are never
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/// written to by the program, but that have relocations, so they
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/// must be stuck in a writeable section so that the dynamic linker
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/// can write to them. If it chooses to, the dynamic linker can
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/// mark the pages these globals end up on as read-only after it is
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/// done with its relocation phase.
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ReadOnlyWithRel,
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/// ReadOnlyWithRelLocal - This is data that is readonly by the
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/// program, but must be writeable so that the dynamic linker
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/// can perform relocations in it. This is used when we know
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/// that all the relocations are to globals in this final
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/// linked image.
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ReadOnlyWithRelLocal
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} K : 8;
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public:
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bool isMetadata() const { return K == Metadata; }
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bool isText() const { return K == Text; }
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bool isReadOnly() const {
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return K == ReadOnly || isMergeableCString() ||
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isMergeableConst();
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}
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bool isMergeableCString() const {
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return K == Mergeable1ByteCString || K == Mergeable2ByteCString ||
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K == Mergeable4ByteCString;
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}
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bool isMergeable1ByteCString() const { return K == Mergeable1ByteCString; }
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bool isMergeable2ByteCString() const { return K == Mergeable2ByteCString; }
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bool isMergeable4ByteCString() const { return K == Mergeable4ByteCString; }
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bool isMergeableConst() const {
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return K == MergeableConst || K == MergeableConst4 ||
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K == MergeableConst8 || K == MergeableConst16;
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}
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bool isMergeableConst4() const { return K == MergeableConst4; }
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bool isMergeableConst8() const { return K == MergeableConst8; }
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bool isMergeableConst16() const { return K == MergeableConst16; }
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bool isWriteable() const {
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return isThreadLocal() || isGlobalWriteableData();
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}
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bool isThreadLocal() const {
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return K == ThreadData || K == ThreadBSS;
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}
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bool isThreadBSS() const { return K == ThreadBSS; }
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bool isThreadData() const { return K == ThreadData; }
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bool isGlobalWriteableData() const {
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return isBSS() || isCommon() || isDataRel() || isReadOnlyWithRel();
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}
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bool isBSS() const { return K == BSS || K == BSSLocal || K == BSSExtern; }
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bool isBSSLocal() const { return K == BSSLocal; }
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bool isBSSExtern() const { return K == BSSExtern; }
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bool isCommon() const { return K == Common; }
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bool isDataRel() const {
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return K == DataRel || K == DataRelLocal || K == DataNoRel;
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}
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bool isDataRelLocal() const {
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return K == DataRelLocal || K == DataNoRel;
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}
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bool isDataNoRel() const { return K == DataNoRel; }
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bool isReadOnlyWithRel() const {
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return K == ReadOnlyWithRel || K == ReadOnlyWithRelLocal;
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}
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bool isReadOnlyWithRelLocal() const {
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return K == ReadOnlyWithRelLocal;
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}
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private:
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static SectionKind get(Kind K) {
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SectionKind Res;
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Res.K = K;
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return Res;
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}
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public:
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static SectionKind getMetadata() { return get(Metadata); }
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static SectionKind getText() { return get(Text); }
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static SectionKind getReadOnly() { return get(ReadOnly); }
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static SectionKind getMergeable1ByteCString() {
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return get(Mergeable1ByteCString);
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}
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static SectionKind getMergeable2ByteCString() {
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return get(Mergeable2ByteCString);
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}
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static SectionKind getMergeable4ByteCString() {
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return get(Mergeable4ByteCString);
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}
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static SectionKind getMergeableConst() { return get(MergeableConst); }
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static SectionKind getMergeableConst4() { return get(MergeableConst4); }
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static SectionKind getMergeableConst8() { return get(MergeableConst8); }
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static SectionKind getMergeableConst16() { return get(MergeableConst16); }
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static SectionKind getThreadBSS() { return get(ThreadBSS); }
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static SectionKind getThreadData() { return get(ThreadData); }
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static SectionKind getBSS() { return get(BSS); }
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static SectionKind getBSSLocal() { return get(BSSLocal); }
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static SectionKind getBSSExtern() { return get(BSSExtern); }
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static SectionKind getCommon() { return get(Common); }
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static SectionKind getDataRel() { return get(DataRel); }
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static SectionKind getDataRelLocal() { return get(DataRelLocal); }
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static SectionKind getDataNoRel() { return get(DataNoRel); }
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static SectionKind getReadOnlyWithRel() { return get(ReadOnlyWithRel); }
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static SectionKind getReadOnlyWithRelLocal(){
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return get(ReadOnlyWithRelLocal);
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}
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};
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} // end namespace llvm
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#endif
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