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initialize method, which can be called when an MCContext is available. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77687 91177308-0d34-0410-b5e6-96231b3b80d8
397 lines
14 KiB
C++
397 lines
14 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_TARGET_TARGETLOWERINGOBJECTFILE_H
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#define LLVM_TARGET_TARGETLOWERINGOBJECTFILE_H
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// FIXME: Switch to MC.
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#include "llvm/Target/TargetAsmInfo.h"
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namespace llvm {
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class MCContext;
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/// SectionKind - This is a simple POD value that classifies the properties of
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/// a section. A global variable 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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class SectionKind {
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public:
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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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/// MergeableCString - This is a special section for nul-terminated
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/// strings. The linker can unique the C strings, knowing their
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/// semantics. Because it uniques based on the nul terminators, the
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/// compiler can't put strings in this section that have embeded nuls
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/// in them.
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MergeableCString,
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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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/// 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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};
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private:
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Kind K : 6;
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/// Weak - This is true if the referenced symbol is weak (i.e. linkonce,
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/// weak, weak_odr, etc). This is orthogonal from the categorization.
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bool Weak : 1;
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/// ExplicitSection - This is true if the global had a section explicitly
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/// specified on it.
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bool ExplicitSection : 1;
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public:
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// FIXME: REMOVE.
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Kind getKind() const { return K; }
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bool isWeak() const { return Weak; }
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bool hasExplicitSection() const { return ExplicitSection; }
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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 || K == MergeableCString || isMergeableConst();
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}
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bool isMergeableCString() const { return K == MergeableCString; }
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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() || isDataRel() || isReadOnlyWithRel();
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}
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bool isBSS() const { return K == BSS; }
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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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static SectionKind get(Kind K, bool isWeak = false,
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bool hasExplicitSection = false) {
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SectionKind Res;
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Res.K = K;
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Res.Weak = isWeak;
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Res.ExplicitSection = hasExplicitSection;
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return Res;
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}
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};
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class Section {
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public:
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std::string Name;
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SectionKind Kind;
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explicit Section() { }
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Section(const std::string &N, SectionKind K) : Name(N), Kind(K) {}
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const std::string &getName() const { return Name; }
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SectionKind getKind() const { return Kind; }
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};
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class TargetLoweringObjectFile {
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private:
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mutable StringMap<Section> Sections;
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protected:
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TargetLoweringObjectFile();
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/// TextSection - Section directive for standard text.
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///
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const Section *TextSection; // Defaults to ".text".
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/// DataSection - Section directive for standard data.
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///
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const Section *DataSection; // Defaults to ".data".
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// FIXME: SINK THESE.
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const Section *BSSSection_;
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/// ReadOnlySection - This is the directive that is emitted to switch to a
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/// read-only section for constant data (e.g. data declared const,
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/// jump tables).
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const Section *ReadOnlySection; // Defaults to NULL
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/// TLSDataSection - Section directive for Thread Local data.
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///
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const Section *TLSDataSection; // Defaults to ".tdata".
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/// TLSBSSSection - Section directive for Thread Local uninitialized data.
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/// Null if this target doesn't support a BSS section.
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///
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const Section *TLSBSSSection; // Defaults to ".tbss".
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const Section *CStringSection_;
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public:
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// FIXME: NONPUB.
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const Section *getOrCreateSection(const char *Name,
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bool isDirective,
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SectionKind::Kind K) const;
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public:
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virtual ~TargetLoweringObjectFile();
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/// Initialize - this method must be called before any actual lowering is
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/// done. This specifies the current context for codegen, and gives the
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/// lowering implementations a chance to set up their default sections.
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virtual void Initialize(MCContext &Ctx, const TargetMachine &TM) {}
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const Section *getTextSection() const { return TextSection; }
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const Section *getDataSection() const { return DataSection; }
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/// getSectionForMergeableConstant - Given a mergeable constant with the
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/// specified size and relocation information, return a section that it
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/// should be placed in.
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virtual const Section *
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getSectionForMergeableConstant(SectionKind Kind) const;
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/// getKindForNamedSection - If this target wants to be able to override
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/// section flags based on the name of the section specified for a global
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/// variable, it can implement this. This is used on ELF systems so that
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/// ".tbss" gets the TLS bit set etc.
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virtual SectionKind::Kind getKindForNamedSection(const char *Section,
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SectionKind::Kind K) const{
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return K;
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}
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/// SectionForGlobal - This method computes the appropriate section to emit
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/// the specified global variable or function definition. This should not
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/// be passed external (or available externally) globals.
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const Section *SectionForGlobal(const GlobalValue *GV,
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Mangler *Mang,
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const TargetMachine &TM) const;
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/// getSpecialCasedSectionGlobals - Allow the target to completely override
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/// section assignment of a global.
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/// FIXME: ELIMINATE this by making PIC16 implement ADDRESS with
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/// getFlagsForNamedSection.
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virtual const Section *
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getSpecialCasedSectionGlobals(const GlobalValue *GV, Mangler *Mang,
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SectionKind Kind) const {
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return 0;
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}
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/// getSectionFlagsAsString - Turn the flags in the specified SectionKind
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/// into a string that can be printed to the assembly file after the
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/// ".section foo" part of a section directive.
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virtual void getSectionFlagsAsString(SectionKind Kind,
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SmallVectorImpl<char> &Str) const {
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}
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protected:
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virtual const Section *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const;
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};
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class TargetLoweringObjectFileELF : public TargetLoweringObjectFile {
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bool AtIsCommentChar; // True if @ is the comment character on this target.
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bool HasCrazyBSS;
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public:
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/// ELF Constructor - AtIsCommentChar is true if the CommentCharacter from TAI
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/// is "@".
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TargetLoweringObjectFileELF(bool atIsCommentChar = false,
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// FIXME: REMOVE AFTER UNIQUING IS FIXED.
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bool hasCrazyBSS = false)
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: AtIsCommentChar(atIsCommentChar), HasCrazyBSS(hasCrazyBSS) {}
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virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
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/// getSectionForMergeableConstant - Given a mergeable constant with the
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/// specified size and relocation information, return a section that it
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/// should be placed in.
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virtual const Section *
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getSectionForMergeableConstant(SectionKind Kind) const;
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virtual SectionKind::Kind getKindForNamedSection(const char *Section,
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SectionKind::Kind K) const;
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void getSectionFlagsAsString(SectionKind Kind,
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SmallVectorImpl<char> &Str) const;
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virtual const Section *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const;
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protected:
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const Section *DataRelSection;
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const Section *DataRelLocalSection;
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const Section *DataRelROSection;
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const Section *DataRelROLocalSection;
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const Section *MergeableConst4Section;
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const Section *MergeableConst8Section;
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const Section *MergeableConst16Section;
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};
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class TargetLoweringObjectFileMachO : public TargetLoweringObjectFile {
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const Section *TextCoalSection;
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const Section *ConstTextCoalSection;
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const Section *ConstDataCoalSection;
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const Section *ConstDataSection;
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const Section *DataCoalSection;
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const Section *FourByteConstantSection;
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const Section *EightByteConstantSection;
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const Section *SixteenByteConstantSection;
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public:
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virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
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virtual const Section *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const;
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virtual const Section *
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getSectionForMergeableConstant(SectionKind Kind) const;
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};
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class TargetLoweringObjectFileCOFF : public TargetLoweringObjectFile {
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public:
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virtual void Initialize(MCContext &Ctx, const TargetMachine &TM);
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virtual void getSectionFlagsAsString(SectionKind Kind,
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SmallVectorImpl<char> &Str) const;
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virtual const Section *
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SelectSectionForGlobal(const GlobalValue *GV, SectionKind Kind,
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Mangler *Mang, const TargetMachine &TM) const;
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};
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} // end namespace llvm
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#endif
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