1 //===-- RTDyldMemoryManager.cpp - Memory manager for MC-JIT -----*- C++ -*-===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // Interface of the runtime dynamic memory manager base class.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
15 #define LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H
17 #include "llvm-c/ExecutionEngine.h"
18 #include "llvm/ExecutionEngine/JITSymbol.h"
19 #include "llvm/ExecutionEngine/RuntimeDyld.h"
20 #include "llvm/Support/CBindingWrapping.h"
27 class ExecutionEngine;
31 } // end namespace object
33 class MCJITMemoryManager : public RuntimeDyld::MemoryManager {
35 // Don't hide the notifyObjectLoaded method from RuntimeDyld::MemoryManager.
36 using RuntimeDyld::MemoryManager::notifyObjectLoaded;
38 /// This method is called after an object has been loaded into memory but
39 /// before relocations are applied to the loaded sections. The object load
40 /// may have been initiated by MCJIT to resolve an external symbol for another
41 /// object that is being finalized. In that case, the object about which
42 /// the memory manager is being notified will be finalized immediately after
43 /// the memory manager returns from this call.
45 /// Memory managers which are preparing code for execution in an external
46 /// address space can use this call to remap the section addresses for the
47 /// newly loaded object.
48 virtual void notifyObjectLoaded(ExecutionEngine *EE,
49 const object::ObjectFile &) {}
52 // RuntimeDyld clients often want to handle the memory management of
53 // what gets placed where. For JIT clients, this is the subset of
54 // JITMemoryManager required for dynamic loading of binaries.
56 // FIXME: As the RuntimeDyld fills out, additional routines will be needed
57 // for the varying types of objects to be allocated.
58 class RTDyldMemoryManager : public MCJITMemoryManager,
59 public JITSymbolResolver {
61 RTDyldMemoryManager() = default;
62 RTDyldMemoryManager(const RTDyldMemoryManager&) = delete;
63 void operator=(const RTDyldMemoryManager&) = delete;
64 ~RTDyldMemoryManager() override;
66 /// Register EH frames in the current process.
67 static void registerEHFramesInProcess(uint8_t *Addr, size_t Size);
69 /// Deregister EH frames in the current proces.
70 static void deregisterEHFramesInProcess(uint8_t *Addr, size_t Size);
72 void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size) override;
73 void deregisterEHFrames() override;
75 /// This method returns the address of the specified function or variable in
76 /// the current process.
77 static uint64_t getSymbolAddressInProcess(const std::string &Name);
79 /// Legacy symbol lookup - DEPRECATED! Please override findSymbol instead.
81 /// This method returns the address of the specified function or variable.
82 /// It is used to resolve symbols during module linking.
83 virtual uint64_t getSymbolAddress(const std::string &Name) {
84 return getSymbolAddressInProcess(Name);
87 /// This method returns a RuntimeDyld::SymbolInfo for the specified function
88 /// or variable. It is used to resolve symbols during module linking.
90 /// By default this falls back on the legacy lookup method:
91 /// 'getSymbolAddress'. The address returned by getSymbolAddress is treated as
92 /// a strong, exported symbol, consistent with historical treatment by
95 /// Clients writing custom RTDyldMemoryManagers are encouraged to override
96 /// this method and return a SymbolInfo with the flags set correctly. This is
97 /// necessary for RuntimeDyld to correctly handle weak and non-exported symbols.
98 JITSymbol findSymbol(const std::string &Name) override {
99 return JITSymbol(getSymbolAddress(Name), JITSymbolFlags::Exported);
102 /// Legacy symbol lookup -- DEPRECATED! Please override
103 /// findSymbolInLogicalDylib instead.
105 /// Default to treating all modules as separate.
106 virtual uint64_t getSymbolAddressInLogicalDylib(const std::string &Name) {
110 /// Default to treating all modules as separate.
112 /// By default this falls back on the legacy lookup method:
113 /// 'getSymbolAddressInLogicalDylib'. The address returned by
114 /// getSymbolAddressInLogicalDylib is treated as a strong, exported symbol,
115 /// consistent with historical treatment by RuntimeDyld.
117 /// Clients writing custom RTDyldMemoryManagers are encouraged to override
118 /// this method and return a SymbolInfo with the flags set correctly. This is
119 /// necessary for RuntimeDyld to correctly handle weak and non-exported symbols.
121 findSymbolInLogicalDylib(const std::string &Name) override {
122 return JITSymbol(getSymbolAddressInLogicalDylib(Name),
123 JITSymbolFlags::Exported);
126 /// This method returns the address of the specified function. As such it is
127 /// only useful for resolving library symbols, not code generated symbols.
129 /// If \p AbortOnFailure is false and no function with the given name is
130 /// found, this function returns a null pointer. Otherwise, it prints a
131 /// message to stderr and aborts.
133 /// This function is deprecated for memory managers to be used with
134 /// MCJIT or RuntimeDyld. Use getSymbolAddress instead.
135 virtual void *getPointerToNamedFunction(const std::string &Name,
136 bool AbortOnFailure = true);
143 std::vector<EHFrame> EHFrames;
146 // Create wrappers for C Binding types (see CBindingWrapping.h).
147 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(
148 RTDyldMemoryManager, LLVMMCJITMemoryManagerRef)
150 } // end namespace llvm
152 #endif // LLVM_EXECUTIONENGINE_RTDYLDMEMORYMANAGER_H