//
//===----------------------------------------------------------------------===//
-#ifndef LLVM_EXECUTIONENGINE_RT_DYLD_MEMORY_MANAGER_H
-#define LLVM_EXECUTIONENGINE_RT_DYLD_MEMORY_MANAGER_H
+#ifndef LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
+#define LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
+#include "RuntimeDyld.h"
+#include "llvm-c/ExecutionEngine.h"
#include "llvm/ADT/StringRef.h"
#include "llvm/Support/CBindingWrapping.h"
#include "llvm/Support/Memory.h"
-#include "llvm-c/ExecutionEngine.h"
namespace llvm {
+class ExecutionEngine;
+
+ namespace object {
+ class ObjectFile;
+ }
+
+class MCJITMemoryManager : public RuntimeDyld::MemoryManager {
+public:
+ /// This method is called after an object has been loaded into memory but
+ /// before relocations are applied to the loaded sections. The object load
+ /// may have been initiated by MCJIT to resolve an external symbol for another
+ /// object that is being finalized. In that case, the object about which
+ /// the memory manager is being notified will be finalized immediately after
+ /// the memory manager returns from this call.
+ ///
+ /// Memory managers which are preparing code for execution in an external
+ /// address space can use this call to remap the section addresses for the
+ /// newly loaded object.
+ virtual void notifyObjectLoaded(ExecutionEngine *EE,
+ const object::ObjectFile &) {}
+};
+
// RuntimeDyld clients often want to handle the memory management of
// what gets placed where. For JIT clients, this is the subset of
// JITMemoryManager required for dynamic loading of binaries.
//
// 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&) LLVM_DELETED_FUNCTION;
- void operator=(const RTDyldMemoryManager&) LLVM_DELETED_FUNCTION;
+class RTDyldMemoryManager : public MCJITMemoryManager,
+ public RuntimeDyld::SymbolResolver {
+ RTDyldMemoryManager(const RTDyldMemoryManager&) = delete;
+ void operator=(const RTDyldMemoryManager&) = delete;
public:
RTDyldMemoryManager() {}
- virtual ~RTDyldMemoryManager();
-
- /// Allocate a memory block of (at least) the given size suitable for
- /// executable code. The SectionID is a unique identifier assigned by the JIT
- /// engine, and optionally recorded by the memory manager to access a loaded
- /// section.
- virtual uint8_t *allocateCodeSection(
- uintptr_t Size, unsigned Alignment, unsigned SectionID,
- StringRef SectionName) = 0;
-
- /// Allocate a memory block of (at least) the given size suitable for data.
- /// The SectionID is a unique identifier assigned by the JIT engine, and
- /// optionally recorded by the memory manager to access a loaded section.
- virtual uint8_t *allocateDataSection(
- uintptr_t Size, unsigned Alignment, unsigned SectionID,
- StringRef SectionName, bool IsReadOnly) = 0;
-
- /// Register the EH frames with the runtime so that c++ exceptions work.
- virtual void registerEHFrames(StringRef SectionData);
+ ~RTDyldMemoryManager() override;
+
+ void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size) override;
+ void deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size) override;
+ /// This method returns the address of the specified function or variable in
+ /// the current process.
+ static uint64_t getSymbolAddressInProcess(const std::string &Name);
+
+ /// Legacy symbol lookup - DEPRECATED! Please override findSymbol instead.
+ ///
/// This method returns the address of the specified function or variable.
/// It is used to resolve symbols during module linking.
- virtual uint64_t getSymbolAddress(const std::string &Name);
+ virtual uint64_t getSymbolAddress(const std::string &Name) {
+ return getSymbolAddressInProcess(Name);
+ }
+
+ /// This method returns a RuntimeDyld::SymbolInfo for the specified function
+ /// or variable. It is used to resolve symbols during module linking.
+ ///
+ /// By default this falls back on the legacy lookup method:
+ /// 'getSymbolAddress'. The address returned by getSymbolAddress is treated as
+ /// a strong, exported symbol, consistent with historical treatment by
+ /// RuntimeDyld.
+ ///
+ /// Clients writing custom RTDyldMemoryManagers are encouraged to override
+ /// this method and return a SymbolInfo with the flags set correctly. This is
+ /// necessary for RuntimeDyld to correctly handle weak and non-exported symbols.
+ RuntimeDyld::SymbolInfo findSymbol(const std::string &Name) override {
+ return RuntimeDyld::SymbolInfo(getSymbolAddress(Name),
+ JITSymbolFlags::Exported);
+ }
+
+ /// Legacy symbol lookup -- DEPRECATED! Please override
+ /// findSymbolInLogicalDylib instead.
+ ///
+ /// Default to treating all modules as separate.
+ virtual uint64_t getSymbolAddressInLogicalDylib(const std::string &Name) {
+ return 0;
+ }
+
+ /// Default to treating all modules as separate.
+ ///
+ /// By default this falls back on the legacy lookup method:
+ /// 'getSymbolAddressInLogicalDylib'. The address returned by
+ /// getSymbolAddressInLogicalDylib is treated as a strong, exported symbol,
+ /// consistent with historical treatment by RuntimeDyld.
+ ///
+ /// Clients writing custom RTDyldMemoryManagers are encouraged to override
+ /// this method and return a SymbolInfo with the flags set correctly. This is
+ /// necessary for RuntimeDyld to correctly handle weak and non-exported symbols.
+ RuntimeDyld::SymbolInfo
+ findSymbolInLogicalDylib(const std::string &Name) override {
+ return RuntimeDyld::SymbolInfo(getSymbolAddressInLogicalDylib(Name),
+ JITSymbolFlags::Exported);
+ }
/// This method returns the address of the specified function. As such it is
/// only useful for resolving library symbols, not code generated symbols.
/// found, this function returns a null pointer. Otherwise, it prints a
/// message to stderr and aborts.
///
- /// This function is deprecated for memory managers used to be used with
+ /// This function is deprecated for memory managers to be used with
/// MCJIT or RuntimeDyld. Use getSymbolAddress instead.
virtual void *getPointerToNamedFunction(const std::string &Name,
bool AbortOnFailure = true);
-
- /// This method is called when object loading is complete and section page
- /// permissions can be applied. It is up to the memory manager implementation
- /// to decide whether or not to act on this method. The memory manager will
- /// typically allocate all sections as read-write and then apply specific
- /// permissions when this method is called. Code sections cannot be executed
- /// until this function has been called. In addition, any cache coherency
- /// operations needed to reliably use the memory are also performed.
- ///
- /// Returns true if an error occurred, false otherwise.
- virtual bool finalizeMemory(std::string *ErrMsg = 0) = 0;
};
// Create wrappers for C Binding types (see CBindingWrapping.h).
} // namespace llvm
-#endif // LLVM_EXECUTIONENGINE_RT_DYLD_MEMORY_MANAGER_H
+
+#endif
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