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//===- tools/dsymutil/DebugMap.h - Generic debug map representation -------===//
//
// The LLVM Linker
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
///
/// \file
///
/// This file contains the class declaration of the DebugMap
/// entity. A DebugMap lists all the object files linked together to
/// produce an executable along with the linked address of all the
/// atoms used in these object files.
/// The DebugMap is an input to the DwarfLinker class that will
/// extract the Dwarf debug information from the referenced object
/// files and link their usefull debug info together.
///
//===----------------------------------------------------------------------===//
#ifndef LLVM_TOOLS_DSYMUTIL_DEBUGMAP_H
#define LLVM_TOOLS_DSYMUTIL_DEBUGMAP_H
#include "llvm/ADT/DenseMap.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/Triple.h"
#include "llvm/ADT/iterator_range.h"
#include "llvm/Object/ObjectFile.h"
#include "llvm/Support/ErrorOr.h"
#include "llvm/Support/Format.h"
#include <vector>
namespace llvm {
class raw_ostream;
namespace dsymutil {
class DebugMapObject;
/// \brief The DebugMap object stores the list of object files to
/// query for debug information along with the mapping between the
/// symbols' addresses in the object file to their linked address in
/// the linked binary.
///
/// A DebugMap producer could look like this:
/// DebugMap *DM = new DebugMap();
/// for (const auto &Obj: LinkedObjects) {
/// DebugMapObject &DMO = DM->addDebugMapObject(Obj.getPath());
/// for (const auto &Sym: Obj.getLinkedSymbols())
/// DMO.addSymbol(Sym.getName(), Sym.getObjectFileAddress(),
/// Sym.getBinaryAddress());
/// }
///
/// A DebugMap consumer can then use the map to link the debug
/// information. For example something along the lines of:
/// for (const auto &DMO: DM->objects()) {
/// auto Obj = createBinary(DMO.getObjectFilename());
/// for (auto &DIE: Obj.getDwarfDIEs()) {
/// if (SymbolMapping *Sym = DMO.lookup(DIE.getName()))
/// DIE.relocate(Sym->ObjectAddress, Sym->BinaryAddress);
/// else
/// DIE.discardSubtree();
/// }
/// }
class DebugMap {
Triple BinaryTriple;
typedef std::vector<std::unique_ptr<DebugMapObject>> ObjectContainer;
ObjectContainer Objects;
public:
DebugMap(const Triple &BinaryTriple) : BinaryTriple(BinaryTriple) {}
typedef ObjectContainer::const_iterator const_iterator;
iterator_range<const_iterator> objects() const {
return make_range(begin(), end());
}
const_iterator begin() const { return Objects.begin(); }
const_iterator end() const { return Objects.end(); }
/// This function adds an DebugMapObject to the list owned by this
/// debug map.
DebugMapObject &addDebugMapObject(StringRef ObjectFilePath);
const Triple &getTriple() { return BinaryTriple; }
void print(raw_ostream &OS) const;
#ifndef NDEBUG
void dump() const;
#endif
};
/// \brief The DebugMapObject represents one object file described by
/// the DebugMap. It contains a list of mappings between addresses in
/// the object file and in the linked binary for all the linked atoms
/// in this object file.
class DebugMapObject {
public:
struct SymbolMapping {
uint64_t ObjectAddress;
uint64_t BinaryAddress;
SymbolMapping(uint64_t ObjectAddress, uint64_t BinaryAddress)
: ObjectAddress(ObjectAddress), BinaryAddress(BinaryAddress) {}
};
typedef StringMapEntry<SymbolMapping> DebugMapEntry;
/// \brief Adds a symbol mapping to this DebugMapObject.
/// \returns false if the symbol was already registered. The request
/// is discarded in this case.
bool addSymbol(llvm::StringRef SymName, uint64_t ObjectAddress,
uint64_t LinkedAddress);
/// \brief Lookup a symbol mapping.
/// \returns null if the symbol isn't found.
const DebugMapEntry *lookupSymbol(StringRef SymbolName) const;
/// \brief Lookup an objectfile address.
/// \returns null if the address isn't found.
const DebugMapEntry *lookupObjectAddress(uint64_t Address) const;
llvm::StringRef getObjectFilename() const { return Filename; }
void print(raw_ostream &OS) const;
#ifndef NDEBUG
void dump() const;
#endif
private:
friend class DebugMap;
/// DebugMapObjects can only be constructed by the owning DebugMap.
DebugMapObject(StringRef ObjectFilename);
std::string Filename;
StringMap<SymbolMapping> Symbols;
DenseMap<uint64_t, DebugMapEntry *> AddressToMapping;
};
}
}
#endif // LLVM_TOOLS_DSYMUTIL_DEBUGMAP_H
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