-//===-- llvm/Target/TargetLoweringObjectFile.h - Object Info ----*- C++ -*-===//
+//===-- llvm/MC/SectionKind.h - Classification of sections ------*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// 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
/// in order to explain the predicates below.
///
class SectionKind {
-public:
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,
- /// MergeableCString - This is a special section for nul-terminated
- /// strings. The linker can unique the C strings, knowing their
- /// semantics. Because it uniques based on the nul terminators, the
- /// compiler can't put strings in this section that have embeded nuls
- /// in them.
- MergeableCString,
-
+ /// 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,
+ /// BSSLocal - This is BSS (zero initialized and writable) data
+ /// which has local linkage.
+ BSSLocal,
- /// 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,
+ /// BSSExtern - This is BSS data with normal external linkage.
+ BSSExtern,
- /// DataNoRel - This is writeable data that has a non-zero
- /// initializer, but whose initializer is known to have no
- /// relocations.
- DataNoRel,
+ /// Common - Data with common linkage. These represent tentative
+ /// definitions, which always have a zero initializer and are never
+ /// marked 'constant'.
+ Common,
+
+ /// This is writeable data that has a non-zero initializer.
+ Data,
/// ReadOnlyWithRel - These are global variables that are never
/// written to by the program, but that have relocations, so they
/// 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
-
- };
-
-protected:
- Kind K : 8;
-
+ ReadOnlyWithRel
+ } K : 8;
public:
-
+
bool isMetadata() const { return K == Metadata; }
bool isText() const { return K == Text; }
-
+
bool isReadOnly() const {
- return K == ReadOnly || K == MergeableCString || isMergeableConst();
+ 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 isMergeableCString() const { return K == MergeableCString; }
bool isMergeableConst() const {
- return K == MergeableConst || K == MergeableConst4 ||
- K == MergeableConst8 || K == MergeableConst16;
+ return 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 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;
+ return isBSS() || isCommon() || isData() || isReadOnlyWithRel();
}
- bool isDataNoRel() const { return K == DataNoRel; }
-
- bool isReadOnlyWithRel() const {
- return K == ReadOnlyWithRel || K == ReadOnlyWithRelLocal;
- }
+ bool isBSS() const { return K == BSS || K == BSSLocal || K == BSSExtern; }
+ bool isBSSLocal() const { return K == BSSLocal; }
+ bool isBSSExtern() const { return K == BSSExtern; }
- bool isReadOnlyWithRelLocal() const {
- return K == ReadOnlyWithRelLocal;
+ bool isCommon() const { return K == Common; }
+
+ bool isData() const { return K == Data; }
+
+ bool isReadOnlyWithRel() const {
+ return K == ReadOnlyWithRel;
}
-
+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 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 getBSSLocal() { return get(BSSLocal); }
+ static SectionKind getBSSExtern() { return get(BSSExtern); }
+ static SectionKind getCommon() { return get(Common); }
+ static SectionKind getData() { return get(Data); }
+ static SectionKind getReadOnlyWithRel() { return get(ReadOnlyWithRel); }
};
-
+
} // end namespace llvm
#endif
projects / oota-llvm.git / blobdiff