Import prebuilt clang toolchain for linux.
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+//===- MCAssembler.h - Object File Generation -------------------*- C++ -*-===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+
+#ifndef LLVM_MC_MCASSEMBLER_H
+#define LLVM_MC_MCASSEMBLER_H
+
+#include "llvm/ADT/ArrayRef.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/ADT/SmallPtrSet.h"
+#include "llvm/ADT/StringRef.h"
+#include "llvm/ADT/iterator.h"
+#include "llvm/ADT/iterator_range.h"
+#include "llvm/BinaryFormat/MachO.h"
+#include "llvm/MC/MCDirectives.h"
+#include "llvm/MC/MCDwarf.h"
+#include "llvm/MC/MCFixup.h"
+#include "llvm/MC/MCFragment.h"
+#include "llvm/MC/MCLinkerOptimizationHint.h"
+#include "llvm/MC/MCSymbol.h"
+#include <cassert>
+#include <cstddef>
+#include <cstdint>
+#include <string>
+#include <utility>
+#include <vector>
+
+namespace llvm {
+
+class MCAsmBackend;
+class MCAsmLayout;
+class MCContext;
+class MCCodeEmitter;
+class MCFragment;
+class MCObjectWriter;
+class MCSection;
+class MCValue;
+
+// FIXME: This really doesn't belong here. See comments below.
+struct IndirectSymbolData {
+ MCSymbol *Symbol;
+ MCSection *Section;
+};
+
+// FIXME: Ditto this. Purely so the Streamer and the ObjectWriter can talk
+// to one another.
+struct DataRegionData {
+ // This enum should be kept in sync w/ the mach-o definition in
+ // llvm/Object/MachOFormat.h.
+ enum KindTy { Data = 1, JumpTable8, JumpTable16, JumpTable32 } Kind;
+ MCSymbol *Start;
+ MCSymbol *End;
+};
+
+class MCAssembler {
+ friend class MCAsmLayout;
+
+public:
+ using SectionListType = std::vector<MCSection *>;
+ using SymbolDataListType = std::vector<const MCSymbol *>;
+
+ using const_iterator = pointee_iterator<SectionListType::const_iterator>;
+ using iterator = pointee_iterator<SectionListType::iterator>;
+
+ using const_symbol_iterator =
+ pointee_iterator<SymbolDataListType::const_iterator>;
+ using symbol_iterator = pointee_iterator<SymbolDataListType::iterator>;
+
+ using symbol_range = iterator_range<symbol_iterator>;
+ using const_symbol_range = iterator_range<const_symbol_iterator>;
+
+ using const_indirect_symbol_iterator =
+ std::vector<IndirectSymbolData>::const_iterator;
+ using indirect_symbol_iterator = std::vector<IndirectSymbolData>::iterator;
+
+ using const_data_region_iterator =
+ std::vector<DataRegionData>::const_iterator;
+ using data_region_iterator = std::vector<DataRegionData>::iterator;
+
+ /// MachO specific deployment target version info.
+ // A Major version of 0 indicates that no version information was supplied
+ // and so the corresponding load command should not be emitted.
+ using VersionInfoType = struct {
+ bool EmitBuildVersion;
+ union {
+ MCVersionMinType Type; ///< Used when EmitBuildVersion==false.
+ MachO::PlatformType Platform; ///< Used when EmitBuildVersion==true.
+ } TypeOrPlatform;
+ unsigned Major;
+ unsigned Minor;
+ unsigned Update;
+ };
+
+private:
+ MCContext &Context;
+
+ MCAsmBackend &Backend;
+
+ MCCodeEmitter &Emitter;
+
+ MCObjectWriter &Writer;
+
+ SectionListType Sections;
+
+ SymbolDataListType Symbols;
+
+ std::vector<IndirectSymbolData> IndirectSymbols;
+
+ std::vector<DataRegionData> DataRegions;
+
+ /// The list of linker options to propagate into the object file.
+ std::vector<std::vector<std::string>> LinkerOptions;
+
+ /// List of declared file names
+ std::vector<std::string> FileNames;
+
+ MCDwarfLineTableParams LTParams;
+
+ /// The set of function symbols for which a .thumb_func directive has
+ /// been seen.
+ //
+ // FIXME: We really would like this in target specific code rather than
+ // here. Maybe when the relocation stuff moves to target specific,
+ // this can go with it? The streamer would need some target specific
+ // refactoring too.
+ mutable SmallPtrSet<const MCSymbol *, 32> ThumbFuncs;
+
+ /// \brief The bundle alignment size currently set in the assembler.
+ ///
+ /// By default it's 0, which means bundling is disabled.
+ unsigned BundleAlignSize;
+
+ bool RelaxAll : 1;
+ bool SubsectionsViaSymbols : 1;
+ bool IncrementalLinkerCompatible : 1;
+
+ /// ELF specific e_header flags
+ // It would be good if there were an MCELFAssembler class to hold this.
+ // ELF header flags are used both by the integrated and standalone assemblers.
+ // Access to the flags is necessary in cases where assembler directives affect
+ // which flags to be set.
+ unsigned ELFHeaderEFlags;
+
+ /// Used to communicate Linker Optimization Hint information between
+ /// the Streamer and the .o writer
+ MCLOHContainer LOHContainer;
+
+ VersionInfoType VersionInfo;
+
+ /// Evaluate a fixup to a relocatable expression and the value which should be
+ /// placed into the fixup.
+ ///
+ /// \param Layout The layout to use for evaluation.
+ /// \param Fixup The fixup to evaluate.
+ /// \param DF The fragment the fixup is inside.
+ /// \param Target [out] On return, the relocatable expression the fixup
+ /// evaluates to.
+ /// \param Value [out] On return, the value of the fixup as currently laid
+ /// out.
+ /// \return Whether the fixup value was fully resolved. This is true if the
+ /// \p Value result is fixed, otherwise the value may change due to
+ /// relocation.
+ bool evaluateFixup(const MCAsmLayout &Layout, const MCFixup &Fixup,
+ const MCFragment *DF, MCValue &Target,
+ uint64_t &Value) const;
+
+ /// Check whether a fixup can be satisfied, or whether it needs to be relaxed
+ /// (increased in size, in order to hold its value correctly).
+ bool fixupNeedsRelaxation(const MCFixup &Fixup, const MCRelaxableFragment *DF,
+ const MCAsmLayout &Layout) const;
+
+ /// Check whether the given fragment needs relaxation.
+ bool fragmentNeedsRelaxation(const MCRelaxableFragment *IF,
+ const MCAsmLayout &Layout) const;
+
+ /// \brief Perform one layout iteration and return true if any offsets
+ /// were adjusted.
+ bool layoutOnce(MCAsmLayout &Layout);
+
+ /// \brief Perform one layout iteration of the given section and return true
+ /// if any offsets were adjusted.
+ bool layoutSectionOnce(MCAsmLayout &Layout, MCSection &Sec);
+
+ bool relaxInstruction(MCAsmLayout &Layout, MCRelaxableFragment &IF);
+
+ bool relaxPaddingFragment(MCAsmLayout &Layout, MCPaddingFragment &PF);
+
+ bool relaxLEB(MCAsmLayout &Layout, MCLEBFragment &IF);
+
+ bool relaxDwarfLineAddr(MCAsmLayout &Layout, MCDwarfLineAddrFragment &DF);
+ bool relaxDwarfCallFrameFragment(MCAsmLayout &Layout,
+ MCDwarfCallFrameFragment &DF);
+ bool relaxCVInlineLineTable(MCAsmLayout &Layout,
+ MCCVInlineLineTableFragment &DF);
+ bool relaxCVDefRange(MCAsmLayout &Layout, MCCVDefRangeFragment &DF);
+
+ /// finishLayout - Finalize a layout, including fragment lowering.
+ void finishLayout(MCAsmLayout &Layout);
+
+ std::tuple<MCValue, uint64_t, bool>
+ handleFixup(const MCAsmLayout &Layout, MCFragment &F, const MCFixup &Fixup);
+
+public:
+ std::vector<std::pair<StringRef, const MCSymbol *>> Symvers;
+
+ /// Construct a new assembler instance.
+ //
+ // FIXME: How are we going to parameterize this? Two obvious options are stay
+ // concrete and require clients to pass in a target like object. The other
+ // option is to make this abstract, and have targets provide concrete
+ // implementations as we do with AsmParser.
+ MCAssembler(MCContext &Context, MCAsmBackend &Backend,
+ MCCodeEmitter &Emitter, MCObjectWriter &Writer);
+ MCAssembler(const MCAssembler &) = delete;
+ MCAssembler &operator=(const MCAssembler &) = delete;
+ ~MCAssembler();
+
+ /// Compute the effective fragment size assuming it is laid out at the given
+ /// \p SectionAddress and \p FragmentOffset.
+ uint64_t computeFragmentSize(const MCAsmLayout &Layout,
+ const MCFragment &F) const;
+
+ /// Find the symbol which defines the atom containing the given symbol, or
+ /// null if there is no such symbol.
+ const MCSymbol *getAtom(const MCSymbol &S) const;
+
+ /// Check whether a particular symbol is visible to the linker and is required
+ /// in the symbol table, or whether it can be discarded by the assembler. This
+ /// also effects whether the assembler treats the label as potentially
+ /// defining a separate atom.
+ bool isSymbolLinkerVisible(const MCSymbol &SD) const;
+
+ /// Emit the section contents using the given object writer.
+ void writeSectionData(const MCSection *Section,
+ const MCAsmLayout &Layout) const;
+
+ /// Check whether a given symbol has been flagged with .thumb_func.
+ bool isThumbFunc(const MCSymbol *Func) const;
+
+ /// Flag a function symbol as the target of a .thumb_func directive.
+ void setIsThumbFunc(const MCSymbol *Func) { ThumbFuncs.insert(Func); }
+
+ /// ELF e_header flags
+ unsigned getELFHeaderEFlags() const { return ELFHeaderEFlags; }
+ void setELFHeaderEFlags(unsigned Flags) { ELFHeaderEFlags = Flags; }
+
+ /// MachO deployment target version information.
+ const VersionInfoType &getVersionInfo() const { return VersionInfo; }
+ void setVersionMin(MCVersionMinType Type, unsigned Major, unsigned Minor,
+ unsigned Update) {
+ VersionInfo.EmitBuildVersion = false;
+ VersionInfo.TypeOrPlatform.Type = Type;
+ VersionInfo.Major = Major;
+ VersionInfo.Minor = Minor;
+ VersionInfo.Update = Update;
+ }
+ void setBuildVersion(MachO::PlatformType Platform, unsigned Major,
+ unsigned Minor, unsigned Update) {
+ VersionInfo.EmitBuildVersion = true;
+ VersionInfo.TypeOrPlatform.Platform = Platform;
+ VersionInfo.Major = Major;
+ VersionInfo.Minor = Minor;
+ VersionInfo.Update = Update;
+ }
+
+ /// Reuse an assembler instance
+ ///
+ void reset();
+
+ MCContext &getContext() const { return Context; }
+
+ MCAsmBackend &getBackend() const { return Backend; }
+
+ MCCodeEmitter &getEmitter() const { return Emitter; }
+
+ MCObjectWriter &getWriter() const { return Writer; }
+
+ MCDwarfLineTableParams getDWARFLinetableParams() const { return LTParams; }
+ void setDWARFLinetableParams(MCDwarfLineTableParams P) { LTParams = P; }
+
+ /// Finish - Do final processing and write the object to the output stream.
+ /// \p Writer is used for custom object writer (as the MCJIT does),
+ /// if not specified it is automatically created from backend.
+ void Finish();
+
+ // Layout all section and prepare them for emission.
+ void layout(MCAsmLayout &Layout);
+
+ // FIXME: This does not belong here.
+ bool getSubsectionsViaSymbols() const { return SubsectionsViaSymbols; }
+ void setSubsectionsViaSymbols(bool Value) { SubsectionsViaSymbols = Value; }
+
+ bool isIncrementalLinkerCompatible() const {
+ return IncrementalLinkerCompatible;
+ }
+ void setIncrementalLinkerCompatible(bool Value) {
+ IncrementalLinkerCompatible = Value;
+ }
+
+ bool getRelaxAll() const { return RelaxAll; }
+ void setRelaxAll(bool Value) { RelaxAll = Value; }
+
+ bool isBundlingEnabled() const { return BundleAlignSize != 0; }
+
+ unsigned getBundleAlignSize() const { return BundleAlignSize; }
+
+ void setBundleAlignSize(unsigned Size) {
+ assert((Size == 0 || !(Size & (Size - 1))) &&
+ "Expect a power-of-two bundle align size");
+ BundleAlignSize = Size;
+ }
+
+ /// \name Section List Access
+ /// @{
+
+ iterator begin() { return Sections.begin(); }
+ const_iterator begin() const { return Sections.begin(); }
+
+ iterator end() { return Sections.end(); }
+ const_iterator end() const { return Sections.end(); }
+
+ size_t size() const { return Sections.size(); }
+
+ /// @}
+ /// \name Symbol List Access
+ /// @{
+ symbol_iterator symbol_begin() { return Symbols.begin(); }
+ const_symbol_iterator symbol_begin() const { return Symbols.begin(); }
+
+ symbol_iterator symbol_end() { return Symbols.end(); }
+ const_symbol_iterator symbol_end() const { return Symbols.end(); }
+
+ symbol_range symbols() { return make_range(symbol_begin(), symbol_end()); }
+ const_symbol_range symbols() const {
+ return make_range(symbol_begin(), symbol_end());
+ }
+
+ size_t symbol_size() const { return Symbols.size(); }
+
+ /// @}
+ /// \name Indirect Symbol List Access
+ /// @{
+
+ // FIXME: This is a total hack, this should not be here. Once things are
+ // factored so that the streamer has direct access to the .o writer, it can
+ // disappear.
+ std::vector<IndirectSymbolData> &getIndirectSymbols() {
+ return IndirectSymbols;
+ }
+
+ indirect_symbol_iterator indirect_symbol_begin() {
+ return IndirectSymbols.begin();
+ }
+ const_indirect_symbol_iterator indirect_symbol_begin() const {
+ return IndirectSymbols.begin();
+ }
+
+ indirect_symbol_iterator indirect_symbol_end() {
+ return IndirectSymbols.end();
+ }
+ const_indirect_symbol_iterator indirect_symbol_end() const {
+ return IndirectSymbols.end();
+ }
+
+ size_t indirect_symbol_size() const { return IndirectSymbols.size(); }
+
+ /// @}
+ /// \name Linker Option List Access
+ /// @{
+
+ std::vector<std::vector<std::string>> &getLinkerOptions() {
+ return LinkerOptions;
+ }
+
+ /// @}
+ /// \name Data Region List Access
+ /// @{
+
+ // FIXME: This is a total hack, this should not be here. Once things are
+ // factored so that the streamer has direct access to the .o writer, it can
+ // disappear.
+ std::vector<DataRegionData> &getDataRegions() { return DataRegions; }
+
+ data_region_iterator data_region_begin() { return DataRegions.begin(); }
+ const_data_region_iterator data_region_begin() const {
+ return DataRegions.begin();
+ }
+
+ data_region_iterator data_region_end() { return DataRegions.end(); }
+ const_data_region_iterator data_region_end() const {
+ return DataRegions.end();
+ }
+
+ size_t data_region_size() const { return DataRegions.size(); }
+
+ /// @}
+ /// \name Data Region List Access
+ /// @{
+
+ // FIXME: This is a total hack, this should not be here. Once things are
+ // factored so that the streamer has direct access to the .o writer, it can
+ // disappear.
+ MCLOHContainer &getLOHContainer() { return LOHContainer; }
+ const MCLOHContainer &getLOHContainer() const {
+ return const_cast<MCAssembler *>(this)->getLOHContainer();
+ }
+ /// @}
+ /// \name Backend Data Access
+ /// @{
+
+ bool registerSection(MCSection &Section);
+
+ void registerSymbol(const MCSymbol &Symbol, bool *Created = nullptr);
+
+ ArrayRef<std::string> getFileNames() { return FileNames; }
+
+ void addFileName(StringRef FileName) {
+ if (!is_contained(FileNames, FileName))
+ FileNames.push_back(FileName);
+ }
+
+ /// \brief Write the necessary bundle padding to the given object writer.
+ /// Expects a fragment \p F containing instructions and its size \p FSize.
+ void writeFragmentPadding(const MCFragment &F, uint64_t FSize,
+ MCObjectWriter *OW) const;
+
+ /// @}
+
+ void dump() const;
+};
+
+/// \brief Compute the amount of padding required before the fragment \p F to
+/// obey bundling restrictions, where \p FOffset is the fragment's offset in
+/// its section and \p FSize is the fragment's size.
+uint64_t computeBundlePadding(const MCAssembler &Assembler, const MCFragment *F,
+ uint64_t FOffset, uint64_t FSize);
+
+} // end namespace llvm
+
+#endif // LLVM_MC_MCASSEMBLER_H