1 //===-- RuntimeDyld.h - Run-time dynamic linker 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 for the runtime dynamic linker facilities of the MC-JIT.
12 //===----------------------------------------------------------------------===//
14 #ifndef LLVM_EXECUTIONENGINE_RUNTIMEDYLD_H
15 #define LLVM_EXECUTIONENGINE_RUNTIMEDYLD_H
17 #include "llvm/ADT/StringRef.h"
18 #include "llvm/ExecutionEngine/ObjectBuffer.h"
19 #include "llvm/ExecutionEngine/RTDyldMemoryManager.h"
20 #include "llvm/Support/Memory.h"
28 class RuntimeDyldImpl;
32 friend class RuntimeDyldChecker;
34 RuntimeDyld(const RuntimeDyld &) LLVM_DELETED_FUNCTION;
35 void operator=(const RuntimeDyld &) LLVM_DELETED_FUNCTION;
37 // RuntimeDyldImpl is the actual class. RuntimeDyld is just the public
39 RuntimeDyldImpl *Dyld;
40 RTDyldMemoryManager *MM;
41 bool ProcessAllSections;
43 // Change the address associated with a section when resolving relocations.
44 // Any relocations already associated with the symbol will be re-resolved.
45 void reassignSectionAddress(unsigned SectionID, uint64_t Addr);
47 RuntimeDyld(RTDyldMemoryManager *);
50 /// Prepare the object contained in the input buffer for execution.
51 /// Ownership of the input buffer is transferred to the ObjectImage
52 /// instance returned from this function if successful. In the case of load
53 /// failure, the input buffer will be deleted.
54 ObjectImage *loadObject(ObjectBuffer *InputBuffer);
56 /// Prepare the referenced object file for execution.
57 /// Ownership of the input object is transferred to the ObjectImage
58 /// instance returned from this function if successful. In the case of load
59 /// failure, the input object will be deleted.
60 ObjectImage *loadObject(std::unique_ptr<object::ObjectFile> InputObject);
62 /// Get the address of our local copy of the symbol. This may or may not
63 /// be the address used for relocation (clients can copy the data around
64 /// and resolve relocatons based on where they put it).
65 void *getSymbolAddress(StringRef Name);
67 /// Get the address of the target copy of the symbol. This is the address
68 /// used for relocation.
69 uint64_t getSymbolLoadAddress(StringRef Name);
71 /// Resolve the relocations for all symbols we currently know about.
72 void resolveRelocations();
74 /// Map a section to its target address space value.
75 /// Map the address of a JIT section as returned from the memory manager
76 /// to the address in the target process as the running code will see it.
77 /// This is the address which will be used for relocation resolution.
78 void mapSectionAddress(const void *LocalAddress, uint64_t TargetAddress);
80 /// Register any EH frame sections that have been loaded but not previously
81 /// registered with the memory manager. Note, RuntimeDyld is responsible
82 /// for identifying the EH frame and calling the memory manager with the
83 /// EH frame section data. However, the memory manager itself will handle
84 /// the actual target-specific EH frame registration.
85 void registerEHFrames();
87 void deregisterEHFrames();
90 StringRef getErrorString();
92 /// By default, only sections that are "required for execution" are passed to
93 /// the RTDyldMemoryManager, and other sections are discarded. Passing 'true'
94 /// to this method will cause RuntimeDyld to pass all sections to its
95 /// memory manager regardless of whether they are "required to execute" in the
96 /// usual sense. This is useful for inspecting metadata sections that may not
97 /// contain relocations, E.g. Debug info, stackmaps.
99 /// Must be called before the first object file is loaded.
100 void setProcessAllSections(bool ProcessAllSections) {
101 assert(!Dyld && "setProcessAllSections must be called before loadObject.");
102 this->ProcessAllSections = ProcessAllSections;
106 } // end namespace llvm