1 //===-- RuntimeDyld.cpp - 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 // Implementation of the MC-JIT runtime dynamic linker.
12 //===----------------------------------------------------------------------===//
14 #define DEBUG_TYPE "dyld"
15 #include "RuntimeDyldImpl.h"
16 #include "llvm/Support/Path.h"
18 using namespace llvm::object;
20 // Empty out-of-line virtual destructor as the key function.
21 RTDyldMemoryManager::~RTDyldMemoryManager() {}
22 RuntimeDyldImpl::~RuntimeDyldImpl() {}
26 void RuntimeDyldImpl::extractFunction(StringRef Name, uint8_t *StartAddress,
27 uint8_t *EndAddress) {
28 // FIXME: DEPRECATED in favor of by-section allocation.
29 // Allocate memory for the function via the memory manager.
30 uintptr_t Size = EndAddress - StartAddress + 1;
31 uintptr_t AllocSize = Size;
32 uint8_t *Mem = MemMgr->startFunctionBody(Name.data(), AllocSize);
33 assert(Size >= (uint64_t)(EndAddress - StartAddress + 1) &&
34 "Memory manager failed to allocate enough memory!");
35 // Copy the function payload into the memory block.
36 memcpy(Mem, StartAddress, Size);
37 MemMgr->endFunctionBody(Name.data(), Mem, Mem + Size);
38 // Remember where we put it.
39 unsigned SectionID = Sections.size();
40 Sections.push_back(sys::MemoryBlock(Mem, Size));
42 // Default the assigned address for this symbol to wherever this
44 SymbolTable[Name] = SymbolLoc(SectionID, 0);
45 DEBUG(dbgs() << " allocated to [" << Mem << ", " << Mem + Size << "]\n");
48 // Resolve the relocations for all symbols we currently know about.
49 void RuntimeDyldImpl::resolveRelocations() {
50 // Just iterate over the sections we have and resolve all the relocations
51 // in them. Gross overkill, but it gets the job done.
52 for (int i = 0, e = Sections.size(); i != e; ++i) {
53 reassignSectionAddress(i, SectionLoadAddress[i]);
57 //===----------------------------------------------------------------------===//
58 // RuntimeDyld class implementation
59 RuntimeDyld::RuntimeDyld(RTDyldMemoryManager *mm) {
64 RuntimeDyld::~RuntimeDyld() {
68 bool RuntimeDyld::loadObject(MemoryBuffer *InputBuffer) {
70 sys::LLVMFileType type = sys::IdentifyFileType(
71 InputBuffer->getBufferStart(),
72 static_cast<unsigned>(InputBuffer->getBufferSize()));
74 case sys::ELF_Relocatable_FileType:
75 case sys::ELF_Executable_FileType:
76 case sys::ELF_SharedObject_FileType:
77 case sys::ELF_Core_FileType:
78 Dyld = new RuntimeDyldELF(MM);
80 case sys::Mach_O_Object_FileType:
81 case sys::Mach_O_Executable_FileType:
82 case sys::Mach_O_FixedVirtualMemorySharedLib_FileType:
83 case sys::Mach_O_Core_FileType:
84 case sys::Mach_O_PreloadExecutable_FileType:
85 case sys::Mach_O_DynamicallyLinkedSharedLib_FileType:
86 case sys::Mach_O_DynamicLinker_FileType:
87 case sys::Mach_O_Bundle_FileType:
88 case sys::Mach_O_DynamicallyLinkedSharedLibStub_FileType:
89 case sys::Mach_O_DSYMCompanion_FileType:
90 Dyld = new RuntimeDyldMachO(MM);
92 case sys::Unknown_FileType:
93 case sys::Bitcode_FileType:
94 case sys::Archive_FileType:
95 case sys::COFF_FileType:
96 report_fatal_error("Incompatible object format!");
99 if (!Dyld->isCompatibleFormat(InputBuffer))
100 report_fatal_error("Incompatible object format!");
103 return Dyld->loadObject(InputBuffer);
106 void *RuntimeDyld::getSymbolAddress(StringRef Name) {
107 return Dyld->getSymbolAddress(Name);
110 void RuntimeDyld::resolveRelocations() {
111 Dyld->resolveRelocations();
114 void RuntimeDyld::reassignSectionAddress(unsigned SectionID,
116 Dyld->reassignSectionAddress(SectionID, Addr);
119 StringRef RuntimeDyld::getErrorString() {
120 return Dyld->getErrorString();
123 } // end namespace llvm