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Diffstat (limited to 'include/llvm/MC/SectionKind.h')
| -rw-r--r-- | include/llvm/MC/SectionKind.h | 221 |
1 files changed, 221 insertions, 0 deletions
diff --git a/include/llvm/MC/SectionKind.h b/include/llvm/MC/SectionKind.h new file mode 100644 index 0000000..945cff7 --- /dev/null +++ b/include/llvm/MC/SectionKind.h @@ -0,0 +1,221 @@ +//===-- llvm/Target/TargetLoweringObjectFile.h - Object Info ----*- C++ -*-===// +// +// The LLVM Compiler Infrastructure +// +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. +// +//===----------------------------------------------------------------------===// +// +// This file implements classes used to handle lowerings specific to common +// object file formats. +// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_MC_SECTIONKIND_H +#define LLVM_MC_SECTIONKIND_H + +namespace llvm { + +/// SectionKind - This is a simple POD value that classifies the properties of +/// a section. A section is classified into the deepest possible +/// classification, and then the target maps them onto their sections based on +/// what capabilities they have. +/// +/// The comments below describe these as if they were an inheritance hierarchy +/// in order to explain the predicates below. +/// +class SectionKind { + enum Kind { + /// Metadata - Debug info sections or other metadata. + Metadata, + + /// Text - Text section, used for functions and other executable code. + Text, + + /// ReadOnly - Data that is never written to at program runtime by the + /// program or the dynamic linker. Things in the top-level readonly + /// SectionKind are not mergeable. + ReadOnly, + + /// MergableCString - Any null-terminated string which allows merging. + /// These values are known to end in a nul value of the specified size, + /// not otherwise contain a nul value, and be mergable. This allows the + /// linker to unique the strings if it so desires. + + /// Mergeable1ByteCString - 1 byte mergable, null terminated, string. + Mergeable1ByteCString, + + /// Mergeable2ByteCString - 2 byte mergable, null terminated, string. + Mergeable2ByteCString, + + /// Mergeable4ByteCString - 4 byte mergable, null terminated, string. + Mergeable4ByteCString, + + /// MergeableConst - These are sections for merging fixed-length + /// constants together. For example, this can be used to unique + /// constant pool entries etc. + MergeableConst, + + /// MergeableConst4 - This is a section used by 4-byte constants, + /// for example, floats. + MergeableConst4, + + /// MergeableConst8 - This is a section used by 8-byte constants, + /// for example, doubles. + MergeableConst8, + + /// MergeableConst16 - This is a section used by 16-byte constants, + /// for example, vectors. + MergeableConst16, + + /// Writeable - This is the base of all segments that need to be written + /// to during program runtime. + + /// ThreadLocal - This is the base of all TLS segments. All TLS + /// objects must be writeable, otherwise there is no reason for them to + /// be thread local! + + /// ThreadBSS - Zero-initialized TLS data objects. + ThreadBSS, + + /// ThreadData - Initialized TLS data objects. + ThreadData, + + /// GlobalWriteableData - Writeable data that is global (not thread + /// local). + + /// BSS - Zero initialized writeable data. + BSS, + + /// DataRel - This is the most general form of data that is written + /// to by the program, it can have random relocations to arbitrary + /// globals. + DataRel, + + /// DataRelLocal - This is writeable data that has a non-zero + /// initializer and has relocations in it, but all of the + /// relocations are known to be within the final linked image + /// the global is linked into. + DataRelLocal, + + /// DataNoRel - This is writeable data that has a non-zero + /// initializer, but whose initializer is known to have no + /// relocations. + DataNoRel, + + /// ReadOnlyWithRel - These are global variables that are never + /// written to by the program, but that have relocations, so they + /// must be stuck in a writeable section so that the dynamic linker + /// can write to them. If it chooses to, the dynamic linker can + /// mark the pages these globals end up on as read-only after it is + /// done with its relocation phase. + ReadOnlyWithRel, + + /// ReadOnlyWithRelLocal - This is data that is readonly by the + /// program, but must be writeable so that the dynamic linker + /// can perform relocations in it. This is used when we know + /// that all the relocations are to globals in this final + /// linked image. + ReadOnlyWithRelLocal + + } K : 8; +public: + + bool isMetadata() const { return K == Metadata; } + bool isText() const { return K == Text; } + + bool isReadOnly() const { + return K == ReadOnly || isMergeableCString() || + isMergeableConst(); + } + + bool isMergeableCString() const { + return K == Mergeable1ByteCString || K == Mergeable2ByteCString || + K == Mergeable4ByteCString; + } + bool isMergeable1ByteCString() const { return K == Mergeable1ByteCString; } + bool isMergeable2ByteCString() const { return K == Mergeable2ByteCString; } + bool isMergeable4ByteCString() const { return K == Mergeable4ByteCString; } + + bool isMergeableConst() const { + return K == MergeableConst || K == MergeableConst4 || + K == MergeableConst8 || K == MergeableConst16; + } + bool isMergeableConst4() const { return K == MergeableConst4; } + bool isMergeableConst8() const { return K == MergeableConst8; } + bool isMergeableConst16() const { return K == MergeableConst16; } + + bool isWriteable() const { + return isThreadLocal() || isGlobalWriteableData(); + } + + bool isThreadLocal() const { + return K == ThreadData || K == ThreadBSS; + } + + bool isThreadBSS() const { return K == ThreadBSS; } + bool isThreadData() const { return K == ThreadData; } + + bool isGlobalWriteableData() const { + return isBSS() || isDataRel() || isReadOnlyWithRel(); + } + + bool isBSS() const { return K == BSS; } + + bool isDataRel() const { + return K == DataRel || K == DataRelLocal || K == DataNoRel; + } + + bool isDataRelLocal() const { + return K == DataRelLocal || K == DataNoRel; + } + + bool isDataNoRel() const { return K == DataNoRel; } + + bool isReadOnlyWithRel() const { + return K == ReadOnlyWithRel || K == ReadOnlyWithRelLocal; + } + + bool isReadOnlyWithRelLocal() const { + return K == ReadOnlyWithRelLocal; + } +private: + static SectionKind get(Kind K) { + SectionKind Res; + Res.K = K; + return Res; + } +public: + + static SectionKind getMetadata() { return get(Metadata); } + static SectionKind getText() { return get(Text); } + static SectionKind getReadOnly() { return get(ReadOnly); } + static SectionKind getMergeable1ByteCString() { + return get(Mergeable1ByteCString); + } + static SectionKind getMergeable2ByteCString() { + return get(Mergeable2ByteCString); + } + static SectionKind getMergeable4ByteCString() { + return get(Mergeable4ByteCString); + } + static SectionKind getMergeableConst() { return get(MergeableConst); } + static SectionKind getMergeableConst4() { return get(MergeableConst4); } + static SectionKind getMergeableConst8() { return get(MergeableConst8); } + static SectionKind getMergeableConst16() { return get(MergeableConst16); } + static SectionKind getThreadBSS() { return get(ThreadBSS); } + static SectionKind getThreadData() { return get(ThreadData); } + static SectionKind getBSS() { return get(BSS); } + static SectionKind getDataRel() { return get(DataRel); } + static SectionKind getDataRelLocal() { return get(DataRelLocal); } + static SectionKind getDataNoRel() { return get(DataNoRel); } + static SectionKind getReadOnlyWithRel() { return get(ReadOnlyWithRel); } + static SectionKind getReadOnlyWithRelLocal(){ + return get(ReadOnlyWithRelLocal); + } +}; + +} // end namespace llvm + +#endif |
