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llvm-for-llvmta/include/llvm/DWARFLinker/DWARFLinker.h

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//===- DWARFLinker.h --------------------------------------------*- C++ -*-===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#ifndef LLVM_DWARFLINKER_DWARFLINKER_H
#define LLVM_DWARFLINKER_DWARFLINKER_H
#include "llvm/CodeGen/AccelTable.h"
#include "llvm/CodeGen/NonRelocatableStringpool.h"
#include "llvm/DWARFLinker/DWARFLinkerDeclContext.h"
#include "llvm/DebugInfo/DWARF/DWARFCompileUnit.h"
#include "llvm/DebugInfo/DWARF/DWARFContext.h"
#include "llvm/MC/MCDwarf.h"
#include <map>
namespace llvm {
enum class DwarfLinkerClient { Dsymutil, LLD, General };
/// The kind of accelerator tables we should emit.
enum class AccelTableKind {
Apple, ///< .apple_names, .apple_namespaces, .apple_types, .apple_objc.
Dwarf, ///< DWARF v5 .debug_names.
Default, ///< Dwarf for DWARF5 or later, Apple otherwise.
};
/// Partial address range. Besides an offset, only the
/// HighPC is stored. The structure is stored in a map where the LowPC is the
/// key.
struct ObjFileAddressRange {
/// Function HighPC.
uint64_t HighPC;
/// Offset to apply to the linked address.
/// should be 0 for not-linked object file.
int64_t Offset;
ObjFileAddressRange(uint64_t EndPC, int64_t Offset)
: HighPC(EndPC), Offset(Offset) {}
ObjFileAddressRange() : HighPC(0), Offset(0) {}
};
/// Map LowPC to ObjFileAddressRange.
using RangesTy = std::map<uint64_t, ObjFileAddressRange>;
/// AddressesMap represents information about valid addresses used
/// by debug information. Valid addresses are those which points to
/// live code sections. i.e. relocations for these addresses point
/// into sections which would be/are placed into resulting binary.
class AddressesMap {
public:
virtual ~AddressesMap();
/// Returns true if represented addresses are from linked file.
/// Returns false if represented addresses are from not-linked
/// object file.
virtual bool areRelocationsResolved() const = 0;
/// Checks that there are valid relocations against a .debug_info
/// section. Reset current relocation pointer if neccessary.
virtual bool hasValidRelocs(bool ResetRelocsPtr = true) = 0;
/// Checks that the specified DIE has a DW_AT_Location attribute
/// that references into a live code section. This function
/// must be called with DIE offsets in strictly ascending order.
virtual bool hasLiveMemoryLocation(const DWARFDie &DIE,
CompileUnit::DIEInfo &Info) = 0;
/// Checks that the specified DIE has a DW_AT_Low_pc attribute
/// that references into a live code section. This function
/// must be called with DIE offsets in strictly ascending order.
virtual bool hasLiveAddressRange(const DWARFDie &DIE,
CompileUnit::DIEInfo &Info) = 0;
/// Apply the valid relocations to the buffer \p Data, taking into
/// account that Data is at \p BaseOffset in the debug_info section.
///
/// This function must be called with monotonic \p BaseOffset values.
///
/// \returns true whether any reloc has been applied.
virtual bool applyValidRelocs(MutableArrayRef<char> Data, uint64_t BaseOffset,
bool IsLittleEndian) = 0;
/// Relocate the given address offset if a valid relocation exists.
virtual llvm::Expected<uint64_t> relocateIndexedAddr(uint64_t Offset) = 0;
/// Returns all valid functions address ranges(i.e., those ranges
/// which points to sections with code).
virtual RangesTy &getValidAddressRanges() = 0;
/// Erases all data.
virtual void clear() = 0;
};
/// DwarfEmitter presents interface to generate all debug info tables.
class DwarfEmitter {
public:
virtual ~DwarfEmitter();
/// Emit DIE containing warnings.
virtual void emitPaperTrailWarningsDie(DIE &Die) = 0;
/// Emit section named SecName with data SecData.
virtual void emitSectionContents(StringRef SecData, StringRef SecName) = 0;
/// Emit the abbreviation table \p Abbrevs to the debug_abbrev section.
virtual void
emitAbbrevs(const std::vector<std::unique_ptr<DIEAbbrev>> &Abbrevs,
unsigned DwarfVersion) = 0;
/// Emit the string table described by \p Pool.
virtual void emitStrings(const NonRelocatableStringpool &Pool) = 0;
/// Emit DWARF debug names.
virtual void
emitDebugNames(AccelTable<DWARF5AccelTableStaticData> &Table) = 0;
/// Emit Apple namespaces accelerator table.
virtual void
emitAppleNamespaces(AccelTable<AppleAccelTableStaticOffsetData> &Table) = 0;
/// Emit Apple names accelerator table.
virtual void
emitAppleNames(AccelTable<AppleAccelTableStaticOffsetData> &Table) = 0;
/// Emit Apple Objective-C accelerator table.
virtual void
emitAppleObjc(AccelTable<AppleAccelTableStaticOffsetData> &Table) = 0;
/// Emit Apple type accelerator table.
virtual void
emitAppleTypes(AccelTable<AppleAccelTableStaticTypeData> &Table) = 0;
/// Emit debug_ranges for \p FuncRange by translating the
/// original \p Entries.
virtual void emitRangesEntries(
int64_t UnitPcOffset, uint64_t OrigLowPc,
const FunctionIntervals::const_iterator &FuncRange,
const std::vector<DWARFDebugRangeList::RangeListEntry> &Entries,
unsigned AddressSize) = 0;
/// Emit debug_aranges entries for \p Unit and if \p DoRangesSection is true,
/// also emit the debug_ranges entries for the DW_TAG_compile_unit's
/// DW_AT_ranges attribute.
virtual void emitUnitRangesEntries(CompileUnit &Unit,
bool DoRangesSection) = 0;
/// Copy the debug_line over to the updated binary while unobfuscating the
/// file names and directories.
virtual void translateLineTable(DataExtractor LineData, uint64_t Offset) = 0;
/// Emit the line table described in \p Rows into the debug_line section.
virtual void emitLineTableForUnit(MCDwarfLineTableParams Params,
StringRef PrologueBytes,
unsigned MinInstLength,
std::vector<DWARFDebugLine::Row> &Rows,
unsigned AdddressSize) = 0;
/// Emit the .debug_pubnames contribution for \p Unit.
virtual void emitPubNamesForUnit(const CompileUnit &Unit) = 0;
/// Emit the .debug_pubtypes contribution for \p Unit.
virtual void emitPubTypesForUnit(const CompileUnit &Unit) = 0;
/// Emit a CIE.
virtual void emitCIE(StringRef CIEBytes) = 0;
/// Emit an FDE with data \p Bytes.
virtual void emitFDE(uint32_t CIEOffset, uint32_t AddreSize, uint32_t Address,
StringRef Bytes) = 0;
/// Emit the debug_loc contribution for \p Unit by copying the entries from
/// \p Dwarf and offsetting them. Update the location attributes to point to
/// the new entries.
virtual void emitLocationsForUnit(
const CompileUnit &Unit, DWARFContext &Dwarf,
std::function<void(StringRef, SmallVectorImpl<uint8_t> &)>
ProcessExpr) = 0;
/// Emit the compilation unit header for \p Unit in the
/// debug_info section.
///
/// As a side effect, this also switches the current Dwarf version
/// of the MC layer to the one of U.getOrigUnit().
virtual void emitCompileUnitHeader(CompileUnit &Unit,
unsigned DwarfVersion) = 0;
/// Recursively emit the DIE tree rooted at \p Die.
virtual void emitDIE(DIE &Die) = 0;
/// Returns size of generated .debug_line section.
virtual uint64_t getLineSectionSize() const = 0;
/// Returns size of generated .debug_frame section.
virtual uint64_t getFrameSectionSize() const = 0;
/// Returns size of generated .debug_ranges section.
virtual uint64_t getRangesSectionSize() const = 0;
/// Returns size of generated .debug_info section.
virtual uint64_t getDebugInfoSectionSize() const = 0;
};
using UnitListTy = std::vector<std::unique_ptr<CompileUnit>>;
/// this class represents DWARF information for source file
/// and it`s address map.
class DWARFFile {
public:
DWARFFile(StringRef Name, DWARFContext *Dwarf, AddressesMap *Addresses,
const std::vector<std::string> &Warnings)
: FileName(Name), Dwarf(Dwarf), Addresses(Addresses), Warnings(Warnings) {
}
/// object file name.
StringRef FileName;
/// source DWARF information.
DWARFContext *Dwarf = nullptr;
/// helpful address information(list of valid address ranges, relocations).
AddressesMap *Addresses = nullptr;
/// warnings for object file.
const std::vector<std::string> &Warnings;
};
typedef std::function<void(const Twine &Warning, StringRef Context,
const DWARFDie *DIE)>
messageHandler;
typedef std::function<ErrorOr<DWARFFile &>(StringRef ContainerName,
StringRef Path)>
objFileLoader;
typedef std::map<std::string, std::string> swiftInterfacesMap;
typedef std::map<std::string, std::string> objectPrefixMap;
/// The core of the Dwarf linking logic.
///
/// The generation of the dwarf information from the object files will be
/// driven by the selection of 'root DIEs', which are DIEs that
/// describe variables or functions that resolves to the corresponding
/// code section(and thus have entries in the Addresses map). All the debug
/// information that will be generated(the DIEs, but also the line
/// tables, ranges, ...) is derived from that set of root DIEs.
///
/// The root DIEs are identified because they contain relocations that
/// points to code section(the low_pc for a function, the location for
/// a variable). These relocations are called ValidRelocs in the
/// AddressesInfo and are gathered as a very first step when we start
/// processing a object file.
class DWARFLinker {
public:
DWARFLinker(DwarfEmitter *Emitter,
DwarfLinkerClient ClientID = DwarfLinkerClient::General)
: TheDwarfEmitter(Emitter), DwarfLinkerClientID(ClientID) {}
/// Add object file to be linked.
void addObjectFile(DWARFFile &File);
/// Link debug info for added objFiles. Object
/// files are linked all together.
bool link();
/// A number of methods setting various linking options:
/// Allows to generate log of linking process to the standard output.
void setVerbosity(bool Verbose) { Options.Verbose = Verbose; }
/// Print statistics to standard output.
void setStatistics(bool Statistics) { Options.Statistics = Statistics; }
/// Do not emit linked dwarf info.
void setNoOutput(bool NoOut) { Options.NoOutput = NoOut; }
/// Do not unique types according to ODR.
void setNoODR(bool NoODR) { Options.NoODR = NoODR; }
/// update existing DWARF info(for the linked binary).
void setUpdate(bool Update) { Options.Update = Update; }
/// Use specified number of threads for parallel files linking.
void setNumThreads(unsigned NumThreads) { Options.Threads = NumThreads; }
/// Set kind of accelerator tables to be generated.
void setAccelTableKind(AccelTableKind Kind) {
Options.TheAccelTableKind = Kind;
}
/// Set prepend path for clang modules.
void setPrependPath(const std::string &Ppath) { Options.PrependPath = Ppath; }
/// Set translator which would be used for strings.
void
setStringsTranslator(std::function<StringRef(StringRef)> StringsTranslator) {
this->StringsTranslator = StringsTranslator;
}
/// Set estimated objects files amount, for preliminary data allocation.
void setEstimatedObjfilesAmount(unsigned ObjFilesNum) {
ObjectContexts.reserve(ObjFilesNum);
}
/// Set warning handler which would be used to report warnings.
void setWarningHandler(messageHandler Handler) {
Options.WarningHandler = Handler;
}
/// Set error handler which would be used to report errors.
void setErrorHandler(messageHandler Handler) {
Options.ErrorHandler = Handler;
}
/// Set object files loader which would be used to load
/// additional objects for splitted dwarf.
void setObjFileLoader(objFileLoader Loader) {
Options.ObjFileLoader = Loader;
}
/// Set map for Swift interfaces.
void setSwiftInterfacesMap(swiftInterfacesMap *Map) {
Options.ParseableSwiftInterfaces = Map;
}
/// Set prefix map for objects.
void setObjectPrefixMap(objectPrefixMap *Map) {
Options.ObjectPrefixMap = Map;
}
private:
/// Flags passed to DwarfLinker::lookForDIEsToKeep
enum TraversalFlags {
TF_Keep = 1 << 0, ///< Mark the traversed DIEs as kept.
TF_InFunctionScope = 1 << 1, ///< Current scope is a function scope.
TF_DependencyWalk = 1 << 2, ///< Walking the dependencies of a kept DIE.
TF_ParentWalk = 1 << 3, ///< Walking up the parents of a kept DIE.
TF_ODR = 1 << 4, ///< Use the ODR while keeping dependents.
TF_SkipPC = 1 << 5, ///< Skip all location attributes.
};
/// The distinct types of work performed by the work loop.
enum class WorklistItemType {
/// Given a DIE, look for DIEs to be kept.
LookForDIEsToKeep,
/// Given a DIE, look for children of this DIE to be kept.
LookForChildDIEsToKeep,
/// Given a DIE, look for DIEs referencing this DIE to be kept.
LookForRefDIEsToKeep,
/// Given a DIE, look for parent DIEs to be kept.
LookForParentDIEsToKeep,
/// Given a DIE, update its incompleteness based on whether its children are
/// incomplete.
UpdateChildIncompleteness,
/// Given a DIE, update its incompleteness based on whether the DIEs it
/// references are incomplete.
UpdateRefIncompleteness,
};
/// This class represents an item in the work list. The type defines what kind
/// of work needs to be performed when processing the current item. The flags
/// and info fields are optional based on the type.
struct WorklistItem {
DWARFDie Die;
WorklistItemType Type;
CompileUnit &CU;
unsigned Flags;
union {
const unsigned AncestorIdx;
CompileUnit::DIEInfo *OtherInfo;
};
WorklistItem(DWARFDie Die, CompileUnit &CU, unsigned Flags,
WorklistItemType T = WorklistItemType::LookForDIEsToKeep)
: Die(Die), Type(T), CU(CU), Flags(Flags), AncestorIdx(0) {}
WorklistItem(DWARFDie Die, CompileUnit &CU, WorklistItemType T,
CompileUnit::DIEInfo *OtherInfo = nullptr)
: Die(Die), Type(T), CU(CU), Flags(0), OtherInfo(OtherInfo) {}
WorklistItem(unsigned AncestorIdx, CompileUnit &CU, unsigned Flags)
: Die(), Type(WorklistItemType::LookForParentDIEsToKeep), CU(CU),
Flags(Flags), AncestorIdx(AncestorIdx) {}
};
/// returns true if we need to translate strings.
bool needToTranslateStrings() { return StringsTranslator != nullptr; }
void reportWarning(const Twine &Warning, const DWARFFile &File,
const DWARFDie *DIE = nullptr) const {
if (Options.WarningHandler != nullptr)
Options.WarningHandler(Warning, File.FileName, DIE);
}
void reportError(const Twine &Warning, const DWARFFile &File,
const DWARFDie *DIE = nullptr) const {
if (Options.ErrorHandler != nullptr)
Options.ErrorHandler(Warning, File.FileName, DIE);
}
/// Remembers the oldest and newest DWARF version we've seen in a unit.
void updateDwarfVersion(unsigned Version) {
MaxDwarfVersion = std::max(MaxDwarfVersion, Version);
MinDwarfVersion = std::min(MinDwarfVersion, Version);
}
/// Remembers the kinds of accelerator tables we've seen in a unit.
void updateAccelKind(DWARFContext &Dwarf);
/// Emit warnings as Dwarf compile units to leave a trail after linking.
bool emitPaperTrailWarnings(const DWARFFile &File,
OffsetsStringPool &StringPool);
void copyInvariantDebugSection(DWARFContext &Dwarf);
/// Keeps track of data associated with one object during linking.
struct LinkContext {
DWARFFile &File;
UnitListTy CompileUnits;
bool Skip = false;
LinkContext(DWARFFile &File) : File(File) {}
/// Clear part of the context that's no longer needed when we're done with
/// the debug object.
void clear() {
CompileUnits.clear();
File.Addresses->clear();
}
};
/// Called before emitting object data
void cleanupAuxiliarryData(LinkContext &Context);
/// Look at the parent of the given DIE and decide whether they should be
/// kept.
void lookForParentDIEsToKeep(unsigned AncestorIdx, CompileUnit &CU,
unsigned Flags,
SmallVectorImpl<WorklistItem> &Worklist);
/// Look at the children of the given DIE and decide whether they should be
/// kept.
void lookForChildDIEsToKeep(const DWARFDie &Die, CompileUnit &CU,
unsigned Flags,
SmallVectorImpl<WorklistItem> &Worklist);
/// Look at DIEs referenced by the given DIE and decide whether they should be
/// kept. All DIEs referenced though attributes should be kept.
void lookForRefDIEsToKeep(const DWARFDie &Die, CompileUnit &CU,
unsigned Flags, const UnitListTy &Units,
const DWARFFile &File,
SmallVectorImpl<WorklistItem> &Worklist);
/// \defgroup FindRootDIEs Find DIEs corresponding to Address map entries.
///
/// @{
/// Recursively walk the \p DIE tree and look for DIEs to
/// keep. Store that information in \p CU's DIEInfo.
///
/// The return value indicates whether the DIE is incomplete.
void lookForDIEsToKeep(AddressesMap &RelocMgr, RangesTy &Ranges,
const UnitListTy &Units, const DWARFDie &DIE,
const DWARFFile &File, CompileUnit &CU,
unsigned Flags);
/// If this compile unit is really a skeleton CU that points to a
/// clang module, register it in ClangModules and return true.
///
/// A skeleton CU is a CU without children, a DW_AT_gnu_dwo_name
/// pointing to the module, and a DW_AT_gnu_dwo_id with the module
/// hash.
bool registerModuleReference(DWARFDie CUDie, const DWARFUnit &Unit,
const DWARFFile &File,
OffsetsStringPool &OffsetsStringPool,
DeclContextTree &ODRContexts,
uint64_t ModulesEndOffset, unsigned &UnitID,
bool IsLittleEndian, unsigned Indent = 0,
bool Quiet = false);
/// Recursively add the debug info in this clang module .pcm
/// file (and all the modules imported by it in a bottom-up fashion)
/// to Units.
Error loadClangModule(DWARFDie CUDie, StringRef FilePath,
StringRef ModuleName, uint64_t DwoId,
const DWARFFile &File,
OffsetsStringPool &OffsetsStringPool,
DeclContextTree &ODRContexts, uint64_t ModulesEndOffset,
unsigned &UnitID, bool IsLittleEndian,
unsigned Indent = 0, bool Quiet = false);
/// Mark the passed DIE as well as all the ones it depends on as kept.
void keepDIEAndDependencies(AddressesMap &RelocMgr, RangesTy &Ranges,
const UnitListTy &Units, const DWARFDie &DIE,
CompileUnit::DIEInfo &MyInfo,
const DWARFFile &File, CompileUnit &CU,
bool UseODR);
unsigned shouldKeepDIE(AddressesMap &RelocMgr, RangesTy &Ranges,
const DWARFDie &DIE, const DWARFFile &File,
CompileUnit &Unit, CompileUnit::DIEInfo &MyInfo,
unsigned Flags);
/// Check if a variable describing DIE should be kept.
/// \returns updated TraversalFlags.
unsigned shouldKeepVariableDIE(AddressesMap &RelocMgr, const DWARFDie &DIE,
CompileUnit::DIEInfo &MyInfo, unsigned Flags);
unsigned shouldKeepSubprogramDIE(AddressesMap &RelocMgr, RangesTy &Ranges,
const DWARFDie &DIE, const DWARFFile &File,
CompileUnit &Unit,
CompileUnit::DIEInfo &MyInfo,
unsigned Flags);
/// Resolve the DIE attribute reference that has been extracted in \p
/// RefValue. The resulting DIE might be in another CompileUnit which is
/// stored into \p ReferencedCU. \returns null if resolving fails for any
/// reason.
DWARFDie resolveDIEReference(const DWARFFile &File, const UnitListTy &Units,
const DWARFFormValue &RefValue,
const DWARFDie &DIE, CompileUnit *&RefCU);
/// @}
/// \defgroup Methods used to link the debug information
///
/// @{
struct DWARFLinkerOptions;
class DIECloner {
DWARFLinker &Linker;
DwarfEmitter *Emitter;
DWARFFile &ObjFile;
/// Allocator used for all the DIEValue objects.
BumpPtrAllocator &DIEAlloc;
std::vector<std::unique_ptr<CompileUnit>> &CompileUnits;
bool Update;
public:
DIECloner(DWARFLinker &Linker, DwarfEmitter *Emitter, DWARFFile &ObjFile,
BumpPtrAllocator &DIEAlloc,
std::vector<std::unique_ptr<CompileUnit>> &CompileUnits,
bool Update)
: Linker(Linker), Emitter(Emitter), ObjFile(ObjFile),
DIEAlloc(DIEAlloc), CompileUnits(CompileUnits), Update(Update) {}
/// Recursively clone \p InputDIE into an tree of DIE objects
/// where useless (as decided by lookForDIEsToKeep()) bits have been
/// stripped out and addresses have been rewritten according to the
/// address map.
///
/// \param OutOffset is the offset the cloned DIE in the output
/// compile unit.
/// \param PCOffset (while cloning a function scope) is the offset
/// applied to the entry point of the function to get the linked address.
/// \param Die the output DIE to use, pass NULL to create one.
/// \returns the root of the cloned tree or null if nothing was selected.
DIE *cloneDIE(const DWARFDie &InputDIE, const DWARFFile &File,
CompileUnit &U, OffsetsStringPool &StringPool,
int64_t PCOffset, uint32_t OutOffset, unsigned Flags,
bool IsLittleEndian, DIE *Die = nullptr);
/// Construct the output DIE tree by cloning the DIEs we
/// chose to keep above. If there are no valid relocs, then there's
/// nothing to clone/emit.
uint64_t cloneAllCompileUnits(DWARFContext &DwarfContext,
const DWARFFile &File,
OffsetsStringPool &StringPool,
bool IsLittleEndian);
private:
using AttributeSpec = DWARFAbbreviationDeclaration::AttributeSpec;
/// Information gathered and exchanged between the various
/// clone*Attributes helpers about the attributes of a particular DIE.
struct AttributesInfo {
/// Names.
DwarfStringPoolEntryRef Name, MangledName, NameWithoutTemplate;
/// Offsets in the string pool.
uint32_t NameOffset = 0;
uint32_t MangledNameOffset = 0;
/// Value of AT_low_pc in the input DIE
uint64_t OrigLowPc = std::numeric_limits<uint64_t>::max();
/// Value of AT_high_pc in the input DIE
uint64_t OrigHighPc = 0;
/// Value of DW_AT_call_return_pc in the input DIE
uint64_t OrigCallReturnPc = 0;
/// Value of DW_AT_call_pc in the input DIE
uint64_t OrigCallPc = 0;
/// Offset to apply to PC addresses inside a function.
int64_t PCOffset = 0;
/// Does the DIE have a low_pc attribute?
bool HasLowPc = false;
/// Does the DIE have a ranges attribute?
bool HasRanges = false;
/// Is this DIE only a declaration?
bool IsDeclaration = false;
AttributesInfo() = default;
};
/// Helper for cloneDIE.
unsigned cloneAttribute(DIE &Die, const DWARFDie &InputDIE,
const DWARFFile &File, CompileUnit &U,
OffsetsStringPool &StringPool,
const DWARFFormValue &Val,
const AttributeSpec AttrSpec, unsigned AttrSize,
AttributesInfo &AttrInfo, bool IsLittleEndian);
/// Clone a string attribute described by \p AttrSpec and add
/// it to \p Die.
/// \returns the size of the new attribute.
unsigned cloneStringAttribute(DIE &Die, AttributeSpec AttrSpec,
const DWARFFormValue &Val, const DWARFUnit &U,
OffsetsStringPool &StringPool,
AttributesInfo &Info);
/// Clone an attribute referencing another DIE and add
/// it to \p Die.
/// \returns the size of the new attribute.
unsigned cloneDieReferenceAttribute(DIE &Die, const DWARFDie &InputDIE,
AttributeSpec AttrSpec,
unsigned AttrSize,
const DWARFFormValue &Val,
const DWARFFile &File,
CompileUnit &Unit);
/// Clone a DWARF expression that may be referencing another DIE.
void cloneExpression(DataExtractor &Data, DWARFExpression Expression,
const DWARFFile &File, CompileUnit &Unit,
SmallVectorImpl<uint8_t> &OutputBuffer);
/// Clone an attribute referencing another DIE and add
/// it to \p Die.
/// \returns the size of the new attribute.
unsigned cloneBlockAttribute(DIE &Die, const DWARFFile &File,
CompileUnit &Unit, AttributeSpec AttrSpec,
const DWARFFormValue &Val, unsigned AttrSize,
bool IsLittleEndian);
/// Clone an attribute referencing another DIE and add
/// it to \p Die.
/// \returns the size of the new attribute.
unsigned cloneAddressAttribute(DIE &Die, AttributeSpec AttrSpec,
const DWARFFormValue &Val,
const CompileUnit &Unit,
AttributesInfo &Info);
/// Clone a scalar attribute and add it to \p Die.
/// \returns the size of the new attribute.
unsigned cloneScalarAttribute(DIE &Die, const DWARFDie &InputDIE,
const DWARFFile &File, CompileUnit &U,
AttributeSpec AttrSpec,
const DWARFFormValue &Val, unsigned AttrSize,
AttributesInfo &Info);
/// Get the potential name and mangled name for the entity
/// described by \p Die and store them in \Info if they are not
/// already there.
/// \returns is a name was found.
bool getDIENames(const DWARFDie &Die, AttributesInfo &Info,
OffsetsStringPool &StringPool, bool StripTemplate = false);
/// Create a copy of abbreviation Abbrev.
void copyAbbrev(const DWARFAbbreviationDeclaration &Abbrev, bool hasODR);
uint32_t hashFullyQualifiedName(DWARFDie DIE, CompileUnit &U,
const DWARFFile &File,
int RecurseDepth = 0);
/// Helper for cloneDIE.
void addObjCAccelerator(CompileUnit &Unit, const DIE *Die,
DwarfStringPoolEntryRef Name,
OffsetsStringPool &StringPool, bool SkipPubSection);
};
/// Assign an abbreviation number to \p Abbrev
void assignAbbrev(DIEAbbrev &Abbrev);
/// Compute and emit debug_ranges section for \p Unit, and
/// patch the attributes referencing it.
void patchRangesForUnit(const CompileUnit &Unit, DWARFContext &Dwarf,
const DWARFFile &File) const;
/// Generate and emit the DW_AT_ranges attribute for a compile_unit if it had
/// one.
void generateUnitRanges(CompileUnit &Unit) const;
/// Extract the line tables from the original dwarf, extract the relevant
/// parts according to the linked function ranges and emit the result in the
/// debug_line section.
void patchLineTableForUnit(CompileUnit &Unit, DWARFContext &OrigDwarf,
const DWARFFile &File);
/// Emit the accelerator entries for \p Unit.
void emitAcceleratorEntriesForUnit(CompileUnit &Unit);
void emitDwarfAcceleratorEntriesForUnit(CompileUnit &Unit);
void emitAppleAcceleratorEntriesForUnit(CompileUnit &Unit);
/// Patch the frame info for an object file and emit it.
void patchFrameInfoForObject(const DWARFFile &, RangesTy &Ranges,
DWARFContext &, unsigned AddressSize);
/// FoldingSet that uniques the abbreviations.
FoldingSet<DIEAbbrev> AbbreviationsSet;
/// Storage for the unique Abbreviations.
/// This is passed to AsmPrinter::emitDwarfAbbrevs(), thus it cannot be
/// changed to a vector of unique_ptrs.
std::vector<std::unique_ptr<DIEAbbrev>> Abbreviations;
/// DIELoc objects that need to be destructed (but not freed!).
std::vector<DIELoc *> DIELocs;
/// DIEBlock objects that need to be destructed (but not freed!).
std::vector<DIEBlock *> DIEBlocks;
/// Allocator used for all the DIEValue objects.
BumpPtrAllocator DIEAlloc;
/// @}
DwarfEmitter *TheDwarfEmitter;
std::vector<LinkContext> ObjectContexts;
unsigned MaxDwarfVersion = 0;
unsigned MinDwarfVersion = std::numeric_limits<unsigned>::max();
bool AtLeastOneAppleAccelTable = false;
bool AtLeastOneDwarfAccelTable = false;
/// The CIEs that have been emitted in the output section. The actual CIE
/// data serves a the key to this StringMap, this takes care of comparing the
/// semantics of CIEs defined in different object files.
StringMap<uint32_t> EmittedCIEs;
/// Offset of the last CIE that has been emitted in the output
/// debug_frame section.
uint32_t LastCIEOffset = 0;
/// Apple accelerator tables.
AccelTable<DWARF5AccelTableStaticData> DebugNames;
AccelTable<AppleAccelTableStaticOffsetData> AppleNames;
AccelTable<AppleAccelTableStaticOffsetData> AppleNamespaces;
AccelTable<AppleAccelTableStaticOffsetData> AppleObjc;
AccelTable<AppleAccelTableStaticTypeData> AppleTypes;
/// Mapping the PCM filename to the DwoId.
StringMap<uint64_t> ClangModules;
DwarfLinkerClient DwarfLinkerClientID;
std::function<StringRef(StringRef)> StringsTranslator = nullptr;
/// linking options
struct DWARFLinkerOptions {
/// Generate processing log to the standard output.
bool Verbose = false;
/// Print statistics.
bool Statistics = false;
/// Skip emitting output
bool NoOutput = false;
/// Do not unique types according to ODR
bool NoODR = false;
/// Update
bool Update = false;
/// Number of threads.
unsigned Threads = 1;
/// The accelerator table kind
AccelTableKind TheAccelTableKind = AccelTableKind::Default;
/// Prepend path for the clang modules.
std::string PrependPath;
// warning handler
messageHandler WarningHandler = nullptr;
// error handler
messageHandler ErrorHandler = nullptr;
objFileLoader ObjFileLoader = nullptr;
/// A list of all .swiftinterface files referenced by the debug
/// info, mapping Module name to path on disk. The entries need to
/// be uniqued and sorted and there are only few entries expected
/// per compile unit, which is why this is a std::map.
/// this is dsymutil specific fag.
swiftInterfacesMap *ParseableSwiftInterfaces = nullptr;
/// A list of remappings to apply to file paths.
objectPrefixMap *ObjectPrefixMap = nullptr;
} Options;
};
} // end namespace llvm
#endif // LLVM_DWARFLINKER_DWARFLINKER_H