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_RT_DYLD_MEMORY_MANAGER_H
15 #define LLVM_EXECUTIONENGINE_RT_DYLD_MEMORY_MANAGER_H
17 #include "llvm-c/ExecutionEngine.h"
18 #include "llvm/ADT/StringRef.h"
19 #include "llvm/Support/CBindingWrapping.h"
20 #include "llvm/Support/Memory.h"
24 class ExecutionEngine;
27 // RuntimeDyld clients often want to handle the memory management of
28 // what gets placed where. For JIT clients, this is the subset of
29 // JITMemoryManager required for dynamic loading of binaries.
31 // FIXME: As the RuntimeDyld fills out, additional routines will be needed
32 // for the varying types of objects to be allocated.
33 class RTDyldMemoryManager {
34 RTDyldMemoryManager(const RTDyldMemoryManager&) LLVM_DELETED_FUNCTION;
35 void operator=(const RTDyldMemoryManager&) LLVM_DELETED_FUNCTION;
37 RTDyldMemoryManager() {}
38 virtual ~RTDyldMemoryManager();
40 /// Allocate a memory block of (at least) the given size suitable for
41 /// executable code. The SectionID is a unique identifier assigned by the JIT
42 /// engine, and optionally recorded by the memory manager to access a loaded
44 virtual uint8_t *allocateCodeSection(
45 uintptr_t Size, unsigned Alignment, unsigned SectionID,
46 StringRef SectionName) = 0;
48 /// Allocate a memory block of (at least) the given size suitable for data.
49 /// The SectionID is a unique identifier assigned by the JIT engine, and
50 /// optionally recorded by the memory manager to access a loaded section.
51 virtual uint8_t *allocateDataSection(
52 uintptr_t Size, unsigned Alignment, unsigned SectionID,
53 StringRef SectionName, bool IsReadOnly) = 0;
55 /// Register the EH frames with the runtime so that c++ exceptions work.
57 /// \p Addr parameter provides the local address of the EH frame section
58 /// data, while \p LoadAddr provides the address of the data in the target
59 /// address space. If the section has not been remapped (which will usually
60 /// be the case for local execution) these two values will be the same.
61 virtual void registerEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size);
63 virtual void deregisterEHFrames(uint8_t *Addr, uint64_t LoadAddr, size_t Size);
65 /// This method returns the address of the specified function or variable.
66 /// It is used to resolve symbols during module linking.
67 virtual uint64_t getSymbolAddress(const std::string &Name);
69 /// This method returns the address of the specified function. As such it is
70 /// only useful for resolving library symbols, not code generated symbols.
72 /// If \p AbortOnFailure is false and no function with the given name is
73 /// found, this function returns a null pointer. Otherwise, it prints a
74 /// message to stderr and aborts.
76 /// This function is deprecated for memory managers to be used with
77 /// MCJIT or RuntimeDyld. Use getSymbolAddress instead.
78 virtual void *getPointerToNamedFunction(const std::string &Name,
79 bool AbortOnFailure = true);
81 /// This method is called after an object has been loaded into memory but
82 /// before relocations are applied to the loaded sections. The object load
83 /// may have been initiated by MCJIT to resolve an external symbol for another
84 /// object that is being finalized. In that case, the object about which
85 /// the memory manager is being notified will be finalized immediately after
86 /// the memory manager returns from this call.
88 /// Memory managers which are preparing code for execution in an external
89 /// address space can use this call to remap the section addresses for the
90 /// newly loaded object.
91 virtual void notifyObjectLoaded(ExecutionEngine *EE,
92 const ObjectImage *) {}
94 /// This method is called when object loading is complete and section page
95 /// permissions can be applied. It is up to the memory manager implementation
96 /// to decide whether or not to act on this method. The memory manager will
97 /// typically allocate all sections as read-write and then apply specific
98 /// permissions when this method is called. Code sections cannot be executed
99 /// until this function has been called. In addition, any cache coherency
100 /// operations needed to reliably use the memory are also performed.
102 /// Returns true if an error occurred, false otherwise.
103 virtual bool finalizeMemory(std::string *ErrMsg = 0) = 0;
106 // Create wrappers for C Binding types (see CBindingWrapping.h).
107 DEFINE_SIMPLE_CONVERSION_FUNCTIONS(
108 RTDyldMemoryManager, LLVMMCJITMemoryManagerRef)
112 #endif // LLVM_EXECUTIONENGINE_RT_DYLD_MEMORY_MANAGER_H