mirror of
https://github.com/RPCS3/llvm-mirror.git
synced 2024-11-25 04:02:41 +01:00
241 lines
8.8 KiB
C++
241 lines
8.8 KiB
C++
//===-- 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,
|
|
|
|
/// BSSLocal - This is BSS (zero initialized and writable) data
|
|
/// which has local linkage.
|
|
BSSLocal,
|
|
|
|
/// BSSExtern - This is BSS data with normal external linkage.
|
|
BSSExtern,
|
|
|
|
/// Common - Data with common linkage. These represent tentative
|
|
/// definitions, which always have a zero initializer and are never
|
|
/// marked 'constant'.
|
|
Common,
|
|
|
|
/// 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() || isCommon() || isDataRel() || isReadOnlyWithRel();
|
|
}
|
|
|
|
bool isBSS() const { return K == BSS || K == BSSLocal || K == BSSExtern; }
|
|
bool isBSSLocal() const { return K == BSSLocal; }
|
|
bool isBSSExtern() const { return K == BSSExtern; }
|
|
|
|
bool isCommon() const { return K == Common; }
|
|
|
|
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 getBSSLocal() { return get(BSSLocal); }
|
|
static SectionKind getBSSExtern() { return get(BSSExtern); }
|
|
static SectionKind getCommon() { return get(Common); }
|
|
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
|