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//===- DWARFDebugLoc.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_DWARFDEBUGLOC_H
#define LLVM_DEBUGINFO_DWARF_DWARFDEBUGLOC_H
#include "llvm/ADT/SmallVector.h"
#include "llvm/DebugInfo/DWARF/DWARFDataExtractor.h"
#include "llvm/Support/Errc.h"
#include <cstdint>
namespace llvm {
class DWARFUnit;
class MCRegisterInfo;
class raw_ostream;
class DWARFObject;
struct DIDumpOptions;
struct DWARFLocationExpression;
namespace object {
struct SectionedAddress;
}
/// A single location within a location list. Entries are stored in the DWARF5
/// form even if they originally come from a DWARF<=4 location list.
struct DWARFLocationEntry {
/// The entry kind (DW_LLE_***).
uint8_t Kind;
/// The first value of the location entry (if applicable).
uint64_t Value0;
/// The second value of the location entry (if applicable).
uint64_t Value1;
/// The index of the section this entry is relative to (if applicable).
uint64_t SectionIndex;
/// The location expression itself (if applicable).
SmallVector<uint8_t, 4> Loc;
};
/// An abstract base class for various kinds of location tables (.debug_loc,
/// .debug_loclists, and their dwo variants).
class DWARFLocationTable {
public:
DWARFLocationTable(DWARFDataExtractor Data) : Data(std::move(Data)) {}
virtual ~DWARFLocationTable() = default;
/// Call the user-provided callback for each entry (including the end-of-list
/// entry) in the location list starting at \p Offset. The callback can return
/// false to terminate the iteration early. Returns an error if it was unable
/// to parse the entire location list correctly. Upon successful termination
/// \p Offset will be updated point past the end of the list.
virtual Error visitLocationList(
uint64_t *Offset,
function_ref<bool(const DWARFLocationEntry &)> Callback) const = 0;
/// Dump the location list at the given \p Offset. The function returns true
/// iff it has successfully reched the end of the list. This means that one
/// can attempt to parse another list after the current one (\p Offset will be
/// updated to point past the end of the current list).
bool dumpLocationList(uint64_t *Offset, raw_ostream &OS,
std::optional<object::SectionedAddress> BaseAddr,
const DWARFObject &Obj, DWARFUnit *U,
DIDumpOptions DumpOpts, unsigned Indent) const;
Error visitAbsoluteLocationList(
uint64_t Offset, std::optional<object::SectionedAddress> BaseAddr,
std::function<std::optional<object::SectionedAddress>(uint32_t)>
LookupAddr,
function_ref<bool(Expected<DWARFLocationExpression>)> Callback) const;
const DWARFDataExtractor &getData() { return Data; }
protected:
DWARFDataExtractor Data;
virtual void dumpRawEntry(const DWARFLocationEntry &Entry, raw_ostream &OS,
unsigned Indent, DIDumpOptions DumpOpts,
const DWARFObject &Obj) const = 0;
};
class DWARFDebugLoc final : public DWARFLocationTable {
public:
/// A list of locations that contain one variable.
struct LocationList {
/// The beginning offset where this location list is stored in the debug_loc
/// section.
uint64_t Offset;
/// All the locations in which the variable is stored.
SmallVector<DWARFLocationEntry, 2> Entries;
};
private:
using LocationLists = SmallVector<LocationList, 4>;
/// A list of all the variables in the debug_loc section, each one describing
/// the locations in which the variable is stored.
LocationLists Locations;
public:
DWARFDebugLoc(DWARFDataExtractor Data)
: DWARFLocationTable(std::move(Data)) {}
/// Print the location lists found within the debug_loc section.
void dump(raw_ostream &OS, const DWARFObject &Obj, DIDumpOptions DumpOpts,
std::optional<uint64_t> Offset) const;
Error visitLocationList(
uint64_t *Offset,
function_ref<bool(const DWARFLocationEntry &)> Callback) const override;
protected:
void dumpRawEntry(const DWARFLocationEntry &Entry, raw_ostream &OS,
unsigned Indent, DIDumpOptions DumpOpts,
const DWARFObject &Obj) const override;
};
class DWARFDebugLoclists final : public DWARFLocationTable {
public:
DWARFDebugLoclists(DWARFDataExtractor Data, uint16_t Version)
: DWARFLocationTable(std::move(Data)), Version(Version) {}
Error visitLocationList(
uint64_t *Offset,
function_ref<bool(const DWARFLocationEntry &)> Callback) const override;
/// Dump all location lists within the given range.
void dumpRange(uint64_t StartOffset, uint64_t Size, raw_ostream &OS,
const DWARFObject &Obj, DIDumpOptions DumpOpts);
protected:
void dumpRawEntry(const DWARFLocationEntry &Entry, raw_ostream &OS,
unsigned Indent, DIDumpOptions DumpOpts,
const DWARFObject &Obj) const override;
private:
uint16_t Version;
};
class ResolverError : public ErrorInfo<ResolverError> {
public:
static char ID;
ResolverError(uint32_t Index, dwarf::LoclistEntries Kind) : Index(Index), Kind(Kind) {}
void log(raw_ostream &OS) const override;
std::error_code convertToErrorCode() const override {
return llvm::errc::invalid_argument;
}
private:
uint32_t Index;
dwarf::LoclistEntries Kind;
};
} // end namespace llvm
#endif // LLVM_DEBUGINFO_DWARF_DWARFDEBUGLOC_H
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