#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringMap.h"
#include "llvm/ADT/Triple.h"
+#include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
#include "llvm/ExecutionEngine/RuntimeDyld.h"
#include "llvm/ExecutionEngine/RuntimeDyldChecker.h"
#include "llvm/Object/ObjectFile.h"
namespace llvm {
+ // Helper for extensive error checking in debug builds.
+inline std::error_code Check(std::error_code Err) {
+ if (Err) {
+ report_fatal_error(Err.message());
+ }
+ return Err;
+}
+
class Twine;
/// SectionEntry - represents a section emitted into memory by the dynamic
/// linker.
class SectionEntry {
-public:
/// Name - section name.
- StringRef Name;
+ std::string Name;
/// Address - address in the linker's memory where the section resides.
uint8_t *Address;
/// relocations (like ARM).
uintptr_t StubOffset;
+ /// The total amount of space allocated for this section. This includes the
+ /// section size and the maximum amount of space that the stubs can occupy.
+ size_t AllocationSize;
+
/// ObjAddress - address of the section in the in-memory object file. Used
/// for calculating relocations in some object formats (like MachO).
uintptr_t ObjAddress;
+public:
SectionEntry(StringRef name, uint8_t *address, size_t size,
- uintptr_t objAddress)
+ size_t allocationSize, uintptr_t objAddress)
: Name(name), Address(address), Size(size),
LoadAddress(reinterpret_cast<uintptr_t>(address)), StubOffset(size),
- ObjAddress(objAddress) {}
+ AllocationSize(allocationSize), ObjAddress(objAddress) {}
+
+ StringRef getName() const { return Name; }
+
+ uint8_t *getAddress() const { return Address; }
+
+ /// \brief Return the address of this section with an offset.
+ uint8_t *getAddressWithOffset(unsigned OffsetBytes) const {
+ assert(OffsetBytes <= AllocationSize && "Offset out of bounds!");
+ return Address + OffsetBytes;
+ }
+
+ size_t getSize() const { return Size; }
+
+ uint64_t getLoadAddress() const { return LoadAddress; }
+ void setLoadAddress(uint64_t LA) { LoadAddress = LA; }
+
+ /// \brief Return the load address of this section with an offset.
+ uint64_t getLoadAddressWithOffset(unsigned OffsetBytes) const {
+ assert(OffsetBytes <= AllocationSize && "Offset out of bounds!");
+ return LoadAddress + OffsetBytes;
+ }
+
+ uintptr_t getStubOffset() const { return StubOffset; }
+
+ void advanceStubOffset(unsigned StubSize) {
+ StubOffset += StubSize;
+ assert(StubOffset <= AllocationSize && "Not enough space allocated!");
+ }
+
+ uintptr_t getObjAddress() const { return ObjAddress; }
};
/// RelocationEntry - used to represent relocations internally in the dynamic
}
};
+/// @brief Symbol info for RuntimeDyld.
+class SymbolTableEntry : public JITSymbolBase {
+public:
+ SymbolTableEntry()
+ : JITSymbolBase(JITSymbolFlags::None), Offset(0), SectionID(0) {}
+
+ SymbolTableEntry(unsigned SectionID, uint64_t Offset, JITSymbolFlags Flags)
+ : JITSymbolBase(Flags), Offset(Offset), SectionID(SectionID) {}
+
+ unsigned getSectionID() const { return SectionID; }
+ uint64_t getOffset() const { return Offset; }
+
+private:
+ uint64_t Offset;
+ unsigned SectionID;
+};
+
+typedef StringMap<SymbolTableEntry> RTDyldSymbolTable;
+
class RuntimeDyldImpl {
friend class RuntimeDyld::LoadedObjectInfo;
friend class RuntimeDyldCheckerImpl;
protected:
+ static const unsigned AbsoluteSymbolSection = ~0U;
+
// The MemoryManager to load objects into.
- RTDyldMemoryManager *MemMgr;
+ RuntimeDyld::MemoryManager &MemMgr;
+
+ // The symbol resolver to use for external symbols.
+ RuntimeDyld::SymbolResolver &Resolver;
// Attached RuntimeDyldChecker instance. Null if no instance attached.
RuntimeDyldCheckerImpl *Checker;
SectionList Sections;
typedef unsigned SID; // Type for SectionIDs
-#define RTDYLD_INVALID_SECTION_ID ((SID)(-1))
+#define RTDYLD_INVALID_SECTION_ID ((RuntimeDyldImpl::SID)(-1))
// Keep a map of sections from object file to the SectionID which
// references it.
typedef std::map<SectionRef, unsigned> ObjSectionToIDMap;
- // A global symbol table for symbols from all loaded modules. Maps the
- // symbol name to a (SectionID, offset in section) pair.
- typedef std::pair<unsigned, uintptr_t> SymbolLoc;
- typedef StringMap<SymbolLoc> SymbolTableMap;
- SymbolTableMap GlobalSymbolTable;
+ // A global symbol table for symbols from all loaded modules.
+ RTDyldSymbolTable GlobalSymbolTable;
- // Pair representing the size and alignment requirement for a common symbol.
- typedef std::pair<unsigned, unsigned> CommonSymbolInfo;
// Keep a map of common symbols to their info pairs
- typedef std::map<SymbolRef, CommonSymbolInfo> CommonSymbolMap;
+ typedef std::vector<SymbolRef> CommonSymbolList;
// For each symbol, keep a list of relocations based on it. Anytime
// its address is reassigned (the JIT re-compiled the function, e.g.),
Triple::ArchType Arch;
bool IsTargetLittleEndian;
+ bool IsMipsO32ABI;
+ bool IsMipsN64ABI;
// True if all sections should be passed to the memory manager, false if only
// sections containing relocations should be. Defaults to 'false'.
}
uint64_t getSectionLoadAddress(unsigned SectionID) const {
- return Sections[SectionID].LoadAddress;
+ return Sections[SectionID].getLoadAddress();
}
uint8_t *getSectionAddress(unsigned SectionID) const {
- return (uint8_t *)Sections[SectionID].Address;
+ return Sections[SectionID].getAddress();
}
void writeInt16BE(uint8_t *Addr, uint16_t Value) {
*(Addr + 7) = Value & 0xFF;
}
+ virtual void setMipsABI(const ObjectFile &Obj) {
+ IsMipsO32ABI = false;
+ IsMipsN64ABI = false;
+ }
+
/// Endian-aware read Read the least significant Size bytes from Src.
uint64_t readBytesUnaligned(uint8_t *Src, unsigned Size) const;
/// \brief Given the common symbols discovered in the object file, emit a
/// new section for them and update the symbol mappings in the object and
/// symbol table.
- void emitCommonSymbols(const ObjectFile &Obj,
- const CommonSymbolMap &CommonSymbols,
- uint64_t TotalSize, SymbolTableMap &SymbolTable);
+ void emitCommonSymbols(const ObjectFile &Obj, CommonSymbolList &CommonSymbols);
/// \brief Emits section data from the object file to the MemoryManager.
/// \param IsCode if it's true then allocateCodeSection() will be
virtual relocation_iterator
processRelocationRef(unsigned SectionID, relocation_iterator RelI,
const ObjectFile &Obj, ObjSectionToIDMap &ObjSectionToID,
- const SymbolTableMap &Symbols, StubMap &Stubs) = 0;
+ StubMap &Stubs) = 0;
/// \brief Resolve relocations to external symbols.
void resolveExternalSymbols();
- /// \brief Update GOT entries for external symbols.
- // The base class does nothing. ELF overrides this.
- virtual void updateGOTEntries(StringRef Name, uint64_t Addr) {}
-
// \brief Compute an upper bound of the memory that is required to load all
// sections
void computeTotalAllocSize(const ObjectFile &Obj, uint64_t &CodeSize,
const SectionRef &Section);
// \brief Implementation of the generic part of the loadObject algorithm.
- std::pair<unsigned, unsigned> loadObjectImpl(const object::ObjectFile &Obj);
+ ObjSectionToIDMap loadObjectImpl(const object::ObjectFile &Obj);
+
+ // \brief Return true if the relocation R may require allocating a stub.
+ virtual bool relocationNeedsStub(const RelocationRef &R) const {
+ return true; // Conservative answer
+ }
public:
- RuntimeDyldImpl(RTDyldMemoryManager *mm)
- : MemMgr(mm), Checker(nullptr), ProcessAllSections(false), HasError(false) {
+ RuntimeDyldImpl(RuntimeDyld::MemoryManager &MemMgr,
+ RuntimeDyld::SymbolResolver &Resolver)
+ : MemMgr(MemMgr), Resolver(Resolver), Checker(nullptr),
+ ProcessAllSections(false), HasError(false) {
}
virtual ~RuntimeDyldImpl();
virtual std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
loadObject(const object::ObjectFile &Obj) = 0;
- uint8_t* getSymbolAddress(StringRef Name) const {
+ uint8_t* getSymbolLocalAddress(StringRef Name) const {
// FIXME: Just look up as a function for now. Overly simple of course.
// Work in progress.
- SymbolTableMap::const_iterator pos = GlobalSymbolTable.find(Name);
+ RTDyldSymbolTable::const_iterator pos = GlobalSymbolTable.find(Name);
if (pos == GlobalSymbolTable.end())
return nullptr;
- SymbolLoc Loc = pos->second;
- return getSectionAddress(Loc.first) + Loc.second;
+ const auto &SymInfo = pos->second;
+ // Absolute symbols do not have a local address.
+ if (SymInfo.getSectionID() == AbsoluteSymbolSection)
+ return nullptr;
+ return getSectionAddress(SymInfo.getSectionID()) + SymInfo.getOffset();
}
- uint64_t getSymbolLoadAddress(StringRef Name) const {
+ RuntimeDyld::SymbolInfo getSymbol(StringRef Name) const {
// FIXME: Just look up as a function for now. Overly simple of course.
// Work in progress.
- SymbolTableMap::const_iterator pos = GlobalSymbolTable.find(Name);
+ RTDyldSymbolTable::const_iterator pos = GlobalSymbolTable.find(Name);
if (pos == GlobalSymbolTable.end())
- return 0;
- SymbolLoc Loc = pos->second;
- return getSectionLoadAddress(Loc.first) + Loc.second;
+ return nullptr;
+ const auto &SymEntry = pos->second;
+ uint64_t SectionAddr = 0;
+ if (SymEntry.getSectionID() != AbsoluteSymbolSection)
+ SectionAddr = getSectionLoadAddress(SymEntry.getSectionID());
+ uint64_t TargetAddr = SectionAddr + SymEntry.getOffset();
+ return RuntimeDyld::SymbolInfo(TargetAddr, SymEntry.getFlags());
}
void resolveRelocations();
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