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//===- DWARFContext.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_DEBUGINFO_DWARF_DWARFCONTEXT_H
#define LLVM_DEBUGINFO_DWARF_DWARFCONTEXT_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/DebugInfo/DIContext.h"
#include "llvm/DebugInfo/DWARF/DWARFDebugLine.h"
#include "llvm/DebugInfo/DWARF/DWARFDie.h"
#include "llvm/DebugInfo/DWARF/DWARFObject.h"
#include "llvm/DebugInfo/DWARF/DWARFUnit.h"
#include "llvm/Object/Binary.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/DataExtractor.h"
#include "llvm/Support/Error.h"
#include "llvm/TargetParser/Host.h"
#include <cstdint>
#include <memory>
#include <mutex>
namespace llvm {
class MemoryBuffer;
class AppleAcceleratorTable;
class DWARFCompileUnit;
class DWARFDebugAbbrev;
class DWARFDebugAranges;
class DWARFDebugFrame;
class DWARFDebugLoc;
class DWARFDebugMacro;
class DWARFDebugNames;
class DWARFGdbIndex;
class DWARFTypeUnit;
class DWARFUnitIndex;
/// DWARFContext
/// This data structure is the top level entity that deals with dwarf debug
/// information parsing. The actual data is supplied through DWARFObj.
class DWARFContext : public DIContext {
public:
/// DWARFContextState
/// This structure contains all member variables for DWARFContext that need
/// to be protected in multi-threaded environments. Threading support can be
/// enabled by setting the ThreadSafe to true when constructing a
/// DWARFContext to allow DWARRContext to be able to be used in a
/// multi-threaded environment, or not enabled to allow for maximum
/// performance in single threaded environments.
class DWARFContextState {
protected:
/// Helper enum to distinguish between macro[.dwo] and macinfo[.dwo]
/// section.
enum MacroSecType {
MacinfoSection,
MacinfoDwoSection,
MacroSection,
MacroDwoSection
};
DWARFContext &D;
public:
DWARFContextState(DWARFContext &DC) : D(DC) {}
virtual ~DWARFContextState() = default;
virtual DWARFUnitVector &getNormalUnits() = 0;
virtual DWARFUnitVector &getDWOUnits(bool Lazy = false) = 0;
virtual const DWARFDebugAbbrev *getDebugAbbrevDWO() = 0;
virtual const DWARFUnitIndex &getCUIndex() = 0;
virtual const DWARFUnitIndex &getTUIndex() = 0;
virtual DWARFGdbIndex &getGdbIndex() = 0;
virtual const DWARFDebugAbbrev *getDebugAbbrev() = 0;
virtual const DWARFDebugLoc *getDebugLoc() = 0;
virtual const DWARFDebugAranges *getDebugAranges() = 0;
virtual Expected<const DWARFDebugLine::LineTable *>
getLineTableForUnit(DWARFUnit *U,
function_ref<void(Error)> RecoverableErrHandler) = 0;
virtual void clearLineTableForUnit(DWARFUnit *U) = 0;
virtual Expected<const DWARFDebugFrame *> getDebugFrame() = 0;
virtual Expected<const DWARFDebugFrame *> getEHFrame() = 0;
virtual const DWARFDebugMacro *getDebugMacinfo() = 0;
virtual const DWARFDebugMacro *getDebugMacinfoDWO() = 0;
virtual const DWARFDebugMacro *getDebugMacro() = 0;
virtual const DWARFDebugMacro *getDebugMacroDWO() = 0;
virtual const DWARFDebugNames &getDebugNames() = 0;
virtual const AppleAcceleratorTable &getAppleNames() = 0;
virtual const AppleAcceleratorTable &getAppleTypes() = 0;
virtual const AppleAcceleratorTable &getAppleNamespaces() = 0;
virtual const AppleAcceleratorTable &getAppleObjC() = 0;
virtual std::shared_ptr<DWARFContext>
getDWOContext(StringRef AbsolutePath) = 0;
virtual const DenseMap<uint64_t, DWARFTypeUnit *> &
getTypeUnitMap(bool IsDWO) = 0;
virtual bool isThreadSafe() const = 0;
/// Parse a macro[.dwo] or macinfo[.dwo] section.
std::unique_ptr<DWARFDebugMacro>
parseMacroOrMacinfo(MacroSecType SectionType);
};
friend class DWARFContextState;
private:
/// All important state for a DWARFContext that needs to be threadsafe needs
/// to go into DWARFContextState.
std::unique_ptr<DWARFContextState> State;
/// The maximum DWARF version of all units.
unsigned MaxVersion = 0;
std::function<void(Error)> RecoverableErrorHandler =
WithColor::defaultErrorHandler;
std::function<void(Error)> WarningHandler = WithColor::defaultWarningHandler;
/// Read compile units from the debug_info.dwo section (if necessary)
/// and type units from the debug_types.dwo section (if necessary)
/// and store them in DWOUnits.
/// If \p Lazy is true, set up to parse but don't actually parse them.
enum { EagerParse = false, LazyParse = true };
DWARFUnitVector &getDWOUnits(bool Lazy = false);
std::unique_ptr<const DWARFObject> DObj;
// When set parses debug_info.dwo/debug_abbrev.dwo manually and populates CU
// Index, and TU Index for DWARF5.
bool ParseCUTUIndexManually = false;
public:
DWARFContext(std::unique_ptr<const DWARFObject> DObj,
std::string DWPName = "",
std::function<void(Error)> RecoverableErrorHandler =
WithColor::defaultErrorHandler,
std::function<void(Error)> WarningHandler =
WithColor::defaultWarningHandler,
bool ThreadSafe = false);
~DWARFContext() override;
DWARFContext(DWARFContext &) = delete;
DWARFContext &operator=(DWARFContext &) = delete;
const DWARFObject &getDWARFObj() const { return *DObj; }
static bool classof(const DIContext *DICtx) {
return DICtx->getKind() == CK_DWARF;
}
/// Dump a textual representation to \p OS. If any \p DumpOffsets are present,
/// dump only the record at the specified offset.
void dump(raw_ostream &OS, DIDumpOptions DumpOpts,
std::array<std::optional<uint64_t>, DIDT_ID_Count> DumpOffsets);
void dump(raw_ostream &OS, DIDumpOptions DumpOpts) override {
std::array<std::optional<uint64_t>, DIDT_ID_Count> DumpOffsets;
dump(OS, DumpOpts, DumpOffsets);
}
bool verify(raw_ostream &OS, DIDumpOptions DumpOpts = {}) override;
using unit_iterator_range = DWARFUnitVector::iterator_range;
using compile_unit_range = DWARFUnitVector::compile_unit_range;
/// Get units from .debug_info in this context.
unit_iterator_range info_section_units() {
DWARFUnitVector &NormalUnits = State->getNormalUnits();
return unit_iterator_range(NormalUnits.begin(),
NormalUnits.begin() +
NormalUnits.getNumInfoUnits());
}
const DWARFUnitVector &getNormalUnitsVector() {
return State->getNormalUnits();
}
/// Get units from .debug_types in this context.
unit_iterator_range types_section_units() {
DWARFUnitVector &NormalUnits = State->getNormalUnits();
return unit_iterator_range(
NormalUnits.begin() + NormalUnits.getNumInfoUnits(), NormalUnits.end());
}
/// Get compile units in this context.
compile_unit_range compile_units() {
return make_filter_range(info_section_units(), isCompileUnit);
}
// If you want type_units(), it'll need to be a concat iterator of a filter of
// TUs in info_section + all the (all type) units in types_section
/// Get all normal compile/type units in this context.
unit_iterator_range normal_units() {
DWARFUnitVector &NormalUnits = State->getNormalUnits();
return unit_iterator_range(NormalUnits.begin(), NormalUnits.end());
}
/// Get units from .debug_info..dwo in the DWO context.
unit_iterator_range dwo_info_section_units() {
DWARFUnitVector &DWOUnits = State->getDWOUnits();
return unit_iterator_range(DWOUnits.begin(),
DWOUnits.begin() + DWOUnits.getNumInfoUnits());
}
const DWARFUnitVector &getDWOUnitsVector() {
return State->getDWOUnits();
}
/// Get units from .debug_types.dwo in the DWO context.
unit_iterator_range dwo_types_section_units() {
DWARFUnitVector &DWOUnits = State->getDWOUnits();
return unit_iterator_range(DWOUnits.begin() + DWOUnits.getNumInfoUnits(),
DWOUnits.end());
}
/// Get compile units in the DWO context.
compile_unit_range dwo_compile_units() {
return make_filter_range(dwo_info_section_units(), isCompileUnit);
}
// If you want dwo_type_units(), it'll need to be a concat iterator of a
// filter of TUs in dwo_info_section + all the (all type) units in
// dwo_types_section.
/// Get all units in the DWO context.
unit_iterator_range dwo_units() {
DWARFUnitVector &DWOUnits = State->getDWOUnits();
return unit_iterator_range(DWOUnits.begin(), DWOUnits.end());
}
/// Get the number of compile units in this context.
unsigned getNumCompileUnits() {
return State->getNormalUnits().getNumInfoUnits();
}
/// Get the number of type units in this context.
unsigned getNumTypeUnits() {
return State->getNormalUnits().getNumTypesUnits();
}
/// Get the number of compile units in the DWO context.
unsigned getNumDWOCompileUnits() {
return State->getDWOUnits().getNumInfoUnits();
}
/// Get the number of type units in the DWO context.
unsigned getNumDWOTypeUnits() {
return State->getDWOUnits().getNumTypesUnits();
}
/// Get the unit at the specified index.
DWARFUnit *getUnitAtIndex(unsigned index) {
return State->getNormalUnits()[index].get();
}
/// Get the unit at the specified index for the DWO units.
DWARFUnit *getDWOUnitAtIndex(unsigned index) {
return State->getDWOUnits()[index].get();
}
DWARFCompileUnit *getDWOCompileUnitForHash(uint64_t Hash);
DWARFTypeUnit *getTypeUnitForHash(uint16_t Version, uint64_t Hash, bool IsDWO);
/// Return the compile unit that includes an offset (relative to .debug_info).
DWARFCompileUnit *getCompileUnitForOffset(uint64_t Offset);
/// Get a DIE given an exact offset.
DWARFDie getDIEForOffset(uint64_t Offset);
unsigned getMaxVersion() {
// Ensure info units have been parsed to discover MaxVersion
info_section_units();
return MaxVersion;
}
unsigned getMaxDWOVersion() {
// Ensure DWO info units have been parsed to discover MaxVersion
dwo_info_section_units();
return MaxVersion;
}
void setMaxVersionIfGreater(unsigned Version) {
if (Version > MaxVersion)
MaxVersion = Version;
}
const DWARFUnitIndex &getCUIndex();
DWARFGdbIndex &getGdbIndex();
const DWARFUnitIndex &getTUIndex();
/// Get a pointer to the parsed DebugAbbrev object.
const DWARFDebugAbbrev *getDebugAbbrev();
/// Get a pointer to the parsed DebugLoc object.
const DWARFDebugLoc *getDebugLoc();
/// Get a pointer to the parsed dwo abbreviations object.
const DWARFDebugAbbrev *getDebugAbbrevDWO();
/// Get a pointer to the parsed DebugAranges object.
const DWARFDebugAranges *getDebugAranges();
/// Get a pointer to the parsed frame information object.
Expected<const DWARFDebugFrame *> getDebugFrame();
/// Get a pointer to the parsed eh frame information object.
Expected<const DWARFDebugFrame *> getEHFrame();
/// Get a pointer to the parsed DebugMacinfo information object.
const DWARFDebugMacro *getDebugMacinfo();
/// Get a pointer to the parsed DebugMacinfoDWO information object.
const DWARFDebugMacro *getDebugMacinfoDWO();
/// Get a pointer to the parsed DebugMacro information object.
const DWARFDebugMacro *getDebugMacro();
/// Get a pointer to the parsed DebugMacroDWO information object.
const DWARFDebugMacro *getDebugMacroDWO();
/// Get a reference to the parsed accelerator table object.
const DWARFDebugNames &getDebugNames();
/// Get a reference to the parsed accelerator table object.
const AppleAcceleratorTable &getAppleNames();
/// Get a reference to the parsed accelerator table object.
const AppleAcceleratorTable &getAppleTypes();
/// Get a reference to the parsed accelerator table object.
const AppleAcceleratorTable &getAppleNamespaces();
/// Get a reference to the parsed accelerator table object.
const AppleAcceleratorTable &getAppleObjC();
/// Get a pointer to a parsed line table corresponding to a compile unit.
/// Report any parsing issues as warnings on stderr.
const DWARFDebugLine::LineTable *getLineTableForUnit(DWARFUnit *U);
/// Get a pointer to a parsed line table corresponding to a compile unit.
/// Report any recoverable parsing problems using the handler.
Expected<const DWARFDebugLine::LineTable *>
getLineTableForUnit(DWARFUnit *U,
function_ref<void(Error)> RecoverableErrorHandler);
// Clear the line table object corresponding to a compile unit for memory
// management purpose. When it's referred to again, it'll be re-populated.
void clearLineTableForUnit(DWARFUnit *U);
DataExtractor getStringExtractor() const {
return DataExtractor(DObj->getStrSection(), false, 0);
}
DataExtractor getStringDWOExtractor() const {
return DataExtractor(DObj->getStrDWOSection(), false, 0);
}
DataExtractor getLineStringExtractor() const {
return DataExtractor(DObj->getLineStrSection(), false, 0);
}
/// Wraps the returned DIEs for a given address.
struct DIEsForAddress {
DWARFCompileUnit *CompileUnit = nullptr;
DWARFDie FunctionDIE;
DWARFDie BlockDIE;
explicit operator bool() const { return CompileUnit != nullptr; }
};
/// Get the compilation unit, the function DIE and lexical block DIE for the
/// given address where applicable.
/// TODO: change input parameter from "uint64_t Address"
/// into "SectionedAddress Address"
/// \param[in] CheckDWO If this is false then only search for address matches
/// in the current context's DIEs. If this is true, then each
/// DWARFUnit that has a DWO file will have the debug info in the
/// DWO file searched as well. This allows for lookups to succeed
/// by searching the split DWARF debug info when using the main
/// executable's debug info.
DIEsForAddress getDIEsForAddress(uint64_t Address, bool CheckDWO = false);
DILineInfo getLineInfoForAddress(
object::SectionedAddress Address,
DILineInfoSpecifier Specifier = DILineInfoSpecifier()) override;
DILineInfo
getLineInfoForDataAddress(object::SectionedAddress Address) override;
DILineInfoTable getLineInfoForAddressRange(
object::SectionedAddress Address, uint64_t Size,
DILineInfoSpecifier Specifier = DILineInfoSpecifier()) override;
DIInliningInfo getInliningInfoForAddress(
object::SectionedAddress Address,
DILineInfoSpecifier Specifier = DILineInfoSpecifier()) override;
std::vector<DILocal>
getLocalsForAddress(object::SectionedAddress Address) override;
bool isLittleEndian() const { return DObj->isLittleEndian(); }
static unsigned getMaxSupportedVersion() { return 5; }
static bool isSupportedVersion(unsigned version) {
return version >= 2 && version <= getMaxSupportedVersion();
}
static SmallVector<uint8_t, 3> getSupportedAddressSizes() {
return {2, 4, 8};
}
static bool isAddressSizeSupported(unsigned AddressSize) {
return llvm::is_contained(getSupportedAddressSizes(), AddressSize);
}
template <typename... Ts>
static Error checkAddressSizeSupported(unsigned AddressSize,
std::error_code EC, char const *Fmt,
const Ts &...Vals) {
if (isAddressSizeSupported(AddressSize))
return Error::success();
std::string Buffer;
raw_string_ostream Stream(Buffer);
Stream << format(Fmt, Vals...)
<< " has unsupported address size: " << AddressSize
<< " (supported are ";
ListSeparator LS;
for (unsigned Size : DWARFContext::getSupportedAddressSizes())
Stream << LS << Size;
Stream << ')';
return make_error<StringError>(Buffer, EC);
}
std::shared_ptr<DWARFContext> getDWOContext(StringRef AbsolutePath);
function_ref<void(Error)> getRecoverableErrorHandler() {
return RecoverableErrorHandler;
}
function_ref<void(Error)> getWarningHandler() { return WarningHandler; }
enum class ProcessDebugRelocations { Process, Ignore };
static std::unique_ptr<DWARFContext>
create(const object::ObjectFile &Obj,
ProcessDebugRelocations RelocAction = ProcessDebugRelocations::Process,
const LoadedObjectInfo *L = nullptr, std::string DWPName = "",
std::function<void(Error)> RecoverableErrorHandler =
WithColor::defaultErrorHandler,
std::function<void(Error)> WarningHandler =
WithColor::defaultWarningHandler,
bool ThreadSafe = false);
static std::unique_ptr<DWARFContext>
create(const StringMap<std::unique_ptr<MemoryBuffer>> &Sections,
uint8_t AddrSize, bool isLittleEndian = sys::IsLittleEndianHost,
std::function<void(Error)> RecoverableErrorHandler =
WithColor::defaultErrorHandler,
std::function<void(Error)> WarningHandler =
WithColor::defaultWarningHandler,
bool ThreadSafe = false);
/// Get address size from CUs.
/// TODO: refactor compile_units() to make this const.
uint8_t getCUAddrSize();
Triple::ArchType getArch() const {
return getDWARFObj().getFile()->getArch();
}
/// Return the compile unit which contains instruction with provided
/// address.
/// TODO: change input parameter from "uint64_t Address"
/// into "SectionedAddress Address"
DWARFCompileUnit *getCompileUnitForCodeAddress(uint64_t Address);
/// Return the compile unit which contains data with the provided address.
/// Note: This is more expensive than `getCompileUnitForAddress`, as if
/// `Address` isn't found in the CU ranges (which is cheap), then it falls
/// back to an expensive O(n) walk of all CU's looking for data that spans the
/// address.
/// TODO: change input parameter from "uint64_t Address" into
/// "SectionedAddress Address"
DWARFCompileUnit *getCompileUnitForDataAddress(uint64_t Address);
/// Returns whether CU/TU should be populated manually. TU Index populated
/// manually only for DWARF5.
bool getParseCUTUIndexManually() const { return ParseCUTUIndexManually; }
/// Sets whether CU/TU should be populated manually. TU Index populated
/// manually only for DWARF5.
void setParseCUTUIndexManually(bool PCUTU) { ParseCUTUIndexManually = PCUTU; }
private:
void addLocalsForDie(DWARFCompileUnit *CU, DWARFDie Subprogram, DWARFDie Die,
std::vector<DILocal> &Result);
};
} // end namespace llvm
#endif // LLVM_DEBUGINFO_DWARF_DWARFCONTEXT_H
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