class RuntimeDyldImpl;
class MemoryBuffer;
-class JITMemoryManager;
+
+// RuntimeDyld clients often want to handle the memory management of
+// what gets placed where. For JIT clients, this is an abstraction layer
+// over the JITMemoryManager, which references objects by their source
+// representations in LLVM IR.
+// FIXME: As the RuntimeDyld fills out, additional routines will be needed
+// for the varying types of objects to be allocated.
+class RTDyldMemoryManager {
+ RTDyldMemoryManager(const RTDyldMemoryManager&); // DO NOT IMPLEMENT
+ void operator=(const RTDyldMemoryManager&); // DO NOT IMPLEMENT
+public:
+ RTDyldMemoryManager() {}
+ virtual ~RTDyldMemoryManager();
+
+ /// allocateCodeSection - Allocate a memory block of (at least) the given
+ /// size suitable for executable code.
+ virtual uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
+ unsigned SectionID) = 0;
+
+ /// allocateDataSection - Allocate a memory block of (at least) the given
+ /// size suitable for data.
+ virtual uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
+ unsigned SectionID) = 0;
+
+ virtual void *getPointerToNamedFunction(const std::string &Name,
+ bool AbortOnFailure = true) = 0;
+};
class RuntimeDyld {
RuntimeDyld(const RuntimeDyld &); // DO NOT IMPLEMENT
// RuntimeDyldImpl is the actual class. RuntimeDyld is just the public
// interface.
RuntimeDyldImpl *Dyld;
+ RTDyldMemoryManager *MM;
+protected:
+ // Change the address associated with a section when resolving relocations.
+ // Any relocations already associated with the symbol will be re-resolved.
+ void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
public:
- RuntimeDyld(JITMemoryManager*);
+ RuntimeDyld(RTDyldMemoryManager*);
~RuntimeDyld();
+ /// Load an in-memory object file into the dynamic linker.
bool loadObject(MemoryBuffer *InputBuffer);
+
+ /// Get the address of our local copy of the symbol. This may or may not
+ /// be the address used for relocation (clients can copy the data around
+ /// and resolve relocatons based on where they put it).
void *getSymbolAddress(StringRef Name);
- // FIXME: Should be parameterized to get the memory block associated with
- // a particular loaded object.
- sys::MemoryBlock getMemoryBlock();
+
+ /// Resolve the relocations for all symbols we currently know about.
+ void resolveRelocations();
+
+ /// mapSectionAddress - map a section to its target address space value.
+ /// Map the address of a JIT section as returned from the memory manager
+ /// to the address in the target process as the running code will see it.
+ /// This is the address which will be used for relocation resolution.
+ void mapSectionAddress(void *LocalAddress, uint64_t TargetAddress);
+
StringRef getErrorString();
};