Reapply part of r237975, "Fix Clang -Wmissing-override warning", except for DIContext...

[oota-llvm.git] / lib / ExecutionEngine / RuntimeDyld / RuntimeDyldELF.h

diff --git a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
index e08f2ee43902d3242064b9d90417f100de30fba0..9a4a8630e4c403d3a29722f6788ad01f90ce4ae0 100644 (file)
--- a/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
+++ b/lib/ExecutionEngine/RuntimeDyld/RuntimeDyldELF.h
@@ -11,8 +11,8 @@
 //
 //===----------------------------------------------------------------------===//
 
-#ifndef LLVM_RUNTIME_DYLD_ELF_H
-#define LLVM_RUNTIME_DYLD_ELF_H
+#ifndef LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H
+#define LLVM_LIB_EXECUTIONENGINE_RUNTIMEDYLD_RUNTIMEDYLDELF_H
 
 #include "RuntimeDyldImpl.h"
 #include "llvm/ADT/DenseMap.h"
@@ -21,17 +21,8 @@ using namespace llvm;
 
 namespace llvm {
 
-namespace {
-// Helper for extensive error checking in debug builds.
-error_code Check(error_code Err) {
-  if (Err) {
-    report_fatal_error(Err.message());
-  }
-  return Err;
-}
-} // end anonymous namespace
-
 class RuntimeDyldELF : public RuntimeDyldImpl {
+
   void resolveRelocation(const SectionEntry &Section, uint64_t Offset,
                          uint64_t Value, uint32_t Type, int64_t Addend,
                          uint64_t SymOffset = 0);
@@ -59,7 +50,7 @@ class RuntimeDyldELF : public RuntimeDyldImpl {
                                 uint64_t Value, uint32_t Type, int64_t Addend);
 
   unsigned getMaxStubSize() override {
-    if (Arch == Triple::aarch64)
+    if (Arch == Triple::aarch64 || Arch == Triple::aarch64_be)
       return 20; // movz; movk; movk; movk; br
     if (Arch == Triple::arm || Arch == Triple::thumb)
       return 8; // 32-bit instruction and 32-bit address
@@ -82,20 +73,46 @@ class RuntimeDyldELF : public RuntimeDyldImpl {
       return 1;
   }
 
-  uint64_t findPPC64TOC() const;
-  void findOPDEntrySection(ObjectImage &Obj, ObjSectionToIDMap &LocalSections,
+  void findPPC64TOCSection(const ObjectFile &Obj,
+                           ObjSectionToIDMap &LocalSections,
+                           RelocationValueRef &Rel);
+  void findOPDEntrySection(const ObjectFile &Obj,
+                           ObjSectionToIDMap &LocalSections,
                            RelocationValueRef &Rel);
 
-  uint64_t findGOTEntry(uint64_t LoadAddr, uint64_t Offset);
   size_t getGOTEntrySize();
 
-  void updateGOTEntries(StringRef Name, uint64_t Addr) override;
+  SectionEntry &getSection(unsigned SectionID) { return Sections[SectionID]; }
+
+  // Allocate no GOT entries for use in the given section.
+  uint64_t allocateGOTEntries(unsigned SectionID, unsigned no);
+
+  // Resolve the relvative address of GOTOffset in Section ID and place
+  // it at the given Offset
+  void resolveGOTOffsetRelocation(unsigned SectionID, uint64_t Offset,
+                                  uint64_t GOTOffset);
 
-  // Relocation entries for symbols whose position-independent offset is
-  // updated in a global offset table.
-  typedef SmallVector<RelocationValueRef, 2> GOTRelocations;
-  GOTRelocations GOTEntries; // List of entries requiring finalization.
-  SmallVector<std::pair<SID, GOTRelocations>, 8> GOTs; // Allocated tables.
+  // For a GOT entry referenced from SectionID, compute a relocation entry
+  // that will place the final resolved value in the GOT slot
+  RelocationEntry computeGOTOffsetRE(unsigned SectionID,
+                                     uint64_t GOTOffset,
+                                     uint64_t SymbolOffset,
+                                     unsigned Type);
+
+  // Compute the address in memory where we can find the placeholder
+  void *computePlaceholderAddress(unsigned SectionID, uint64_t Offset) const;
+
+  // Split out common case for createing the RelocationEntry for when the relocation requires
+  // no particular advanced processing.
+  void processSimpleRelocation(unsigned SectionID, uint64_t Offset, unsigned RelType, RelocationValueRef Value);
+
+  // The tentative ID for the GOT section
+  unsigned GOTSectionID;
+
+  // Records the current number of allocated slots in the GOT
+  // (This would be equivalent to GOTEntries.size() were it not for relocations
+  // that consume more than one slot)
+  unsigned CurrentGOTIndex;
 
   // When a module is loaded we save the SectionID of the EH frame section
   // in a table until we receive a request to register all unregistered
@@ -104,22 +121,24 @@ class RuntimeDyldELF : public RuntimeDyldImpl {
   SmallVector<SID, 2> RegisteredEHFrameSections;
 
 public:
-  RuntimeDyldELF(RTDyldMemoryManager *mm) : RuntimeDyldImpl(mm) {}
+  RuntimeDyldELF(RuntimeDyld::MemoryManager &MemMgr,
+                 RuntimeDyld::SymbolResolver &Resolver);
+  ~RuntimeDyldELF() override;
+
+  std::unique_ptr<RuntimeDyld::LoadedObjectInfo>
+  loadObject(const object::ObjectFile &O) override;
 
   void resolveRelocation(const RelocationEntry &RE, uint64_t Value) override;
   relocation_iterator
   processRelocationRef(unsigned SectionID, relocation_iterator RelI,
-                       ObjectImage &Obj, ObjSectionToIDMap &ObjSectionToID,
-                       const SymbolTableMap &Symbols, StubMap &Stubs) override;
-  bool isCompatibleFormat(const ObjectBuffer *Buffer) const override;
-  bool isCompatibleFile(const object::ObjectFile *Buffer) const override;
+                       const ObjectFile &Obj,
+                       ObjSectionToIDMap &ObjSectionToID,
+                       StubMap &Stubs) override;
+  bool isCompatibleFile(const object::ObjectFile &Obj) const override;
   void registerEHFrames() override;
   void deregisterEHFrames() override;
-  void finalizeLoad(ObjSectionToIDMap &SectionMap) override;
-  virtual ~RuntimeDyldELF();
-
-  static ObjectImage *createObjectImage(ObjectBuffer *InputBuffer);
-  static ObjectImage *createObjectImageFromFile(std::unique_ptr<object::ObjectFile> Obj);
+  void finalizeLoad(const ObjectFile &Obj,
+                    ObjSectionToIDMap &SectionMap) override;
 };
 
 } // end namespace llvm