1 //===-- llvm-rtdyld.cpp - MCJIT Testing Tool ------------------------------===//
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 // This is a testing tool for use with the MC-JIT LLVM components.
12 //===----------------------------------------------------------------------===//
14 #include "llvm/ADT/OwningPtr.h"
15 #include "llvm/ADT/StringMap.h"
16 #include "llvm/DebugInfo/DIContext.h"
17 #include "llvm/ExecutionEngine/ObjectBuffer.h"
18 #include "llvm/ExecutionEngine/ObjectImage.h"
19 #include "llvm/ExecutionEngine/RuntimeDyld.h"
20 #include "llvm/Object/MachO.h"
21 #include "llvm/Support/CommandLine.h"
22 #include "llvm/Support/ManagedStatic.h"
23 #include "llvm/Support/Memory.h"
24 #include "llvm/Support/MemoryBuffer.h"
25 #include "llvm/Support/raw_ostream.h"
26 #include "llvm/Support/system_error.h"
28 using namespace llvm::object;
30 static cl::list<std::string>
31 InputFileList(cl::Positional, cl::ZeroOrMore,
32 cl::desc("<input file>"));
39 static cl::opt<ActionType>
40 Action(cl::desc("Action to perform:"),
42 cl::values(clEnumValN(AC_Execute, "execute",
43 "Load, link, and execute the inputs."),
44 clEnumValN(AC_PrintLineInfo, "printline",
45 "Load, link, and print line information for each function."),
48 static cl::opt<std::string>
50 cl::desc("Function to call as entry point."),
55 // A trivial memory manager that doesn't do anything fancy, just uses the
56 // support library allocation routines directly.
57 class TrivialMemoryManager : public RTDyldMemoryManager {
59 SmallVector<sys::MemoryBlock, 16> FunctionMemory;
60 SmallVector<sys::MemoryBlock, 16> DataMemory;
62 uint8_t *allocateCodeSection(uintptr_t Size, unsigned Alignment,
63 unsigned SectionID, StringRef SectionName);
64 uint8_t *allocateDataSection(uintptr_t Size, unsigned Alignment,
65 unsigned SectionID, StringRef SectionName,
68 virtual void *getPointerToNamedFunction(const std::string &Name,
69 bool AbortOnFailure = true) {
73 bool finalizeMemory(std::string *ErrMsg) { return false; }
75 // Invalidate instruction cache for sections with execute permissions.
76 // Some platforms with separate data cache and instruction cache require
77 // explicit cache flush, otherwise JIT code manipulations (like resolved
78 // relocations) will get to the data cache but not to the instruction cache.
79 virtual void invalidateInstructionCache();
82 uint8_t *TrivialMemoryManager::allocateCodeSection(uintptr_t Size,
85 StringRef SectionName) {
86 sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, 0, 0);
87 FunctionMemory.push_back(MB);
88 return (uint8_t*)MB.base();
91 uint8_t *TrivialMemoryManager::allocateDataSection(uintptr_t Size,
94 StringRef SectionName,
96 sys::MemoryBlock MB = sys::Memory::AllocateRWX(Size, 0, 0);
97 DataMemory.push_back(MB);
98 return (uint8_t*)MB.base();
101 void TrivialMemoryManager::invalidateInstructionCache() {
102 for (int i = 0, e = FunctionMemory.size(); i != e; ++i)
103 sys::Memory::InvalidateInstructionCache(FunctionMemory[i].base(),
104 FunctionMemory[i].size());
106 for (int i = 0, e = DataMemory.size(); i != e; ++i)
107 sys::Memory::InvalidateInstructionCache(DataMemory[i].base(),
108 DataMemory[i].size());
111 static const char *ProgramName;
113 static void Message(const char *Type, const Twine &Msg) {
114 errs() << ProgramName << ": " << Type << ": " << Msg << "\n";
117 static int Error(const Twine &Msg) {
118 Message("error", Msg);
124 static int printLineInfoForInput() {
125 // If we don't have any input files, read from stdin.
126 if (!InputFileList.size())
127 InputFileList.push_back("-");
128 for(unsigned i = 0, e = InputFileList.size(); i != e; ++i) {
129 // Instantiate a dynamic linker.
130 TrivialMemoryManager MemMgr;
131 RuntimeDyld Dyld(&MemMgr);
133 // Load the input memory buffer.
134 OwningPtr<MemoryBuffer> InputBuffer;
135 OwningPtr<ObjectImage> LoadedObject;
136 if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFileList[i],
138 return Error("unable to read input: '" + ec.message() + "'");
140 // Load the object file
141 LoadedObject.reset(Dyld.loadObject(new ObjectBuffer(InputBuffer.take())));
143 return Error(Dyld.getErrorString());
146 // Resolve all the relocations we can.
147 Dyld.resolveRelocations();
149 OwningPtr<DIContext> Context(DIContext::getDWARFContext(LoadedObject->getObjectFile()));
151 // Use symbol info to iterate functions in the object.
153 for (object::symbol_iterator I = LoadedObject->begin_symbols(),
154 E = LoadedObject->end_symbols();
157 object::SymbolRef::Type SymType;
158 if (I->getType(SymType)) continue;
159 if (SymType == object::SymbolRef::ST_Function) {
163 if (I->getName(Name)) continue;
164 if (I->getAddress(Addr)) continue;
165 if (I->getSize(Size)) continue;
167 outs() << "Function: " << Name << ", Size = " << Size << "\n";
169 DILineInfoTable Lines = Context->getLineInfoForAddressRange(Addr, Size);
170 DILineInfoTable::iterator Begin = Lines.begin();
171 DILineInfoTable::iterator End = Lines.end();
172 for (DILineInfoTable::iterator It = Begin; It != End; ++It) {
173 outs() << " Line info @ " << It->first - Addr << ": "
174 << It->second.getFileName()
175 << ", line:" << It->second.getLine() << "\n";
184 static int executeInput() {
185 // Instantiate a dynamic linker.
186 TrivialMemoryManager MemMgr;
187 RuntimeDyld Dyld(&MemMgr);
189 // If we don't have any input files, read from stdin.
190 if (!InputFileList.size())
191 InputFileList.push_back("-");
192 for(unsigned i = 0, e = InputFileList.size(); i != e; ++i) {
193 // Load the input memory buffer.
194 OwningPtr<MemoryBuffer> InputBuffer;
195 OwningPtr<ObjectImage> LoadedObject;
196 if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFileList[i],
198 return Error("unable to read input: '" + ec.message() + "'");
200 // Load the object file
201 LoadedObject.reset(Dyld.loadObject(new ObjectBuffer(InputBuffer.take())));
203 return Error(Dyld.getErrorString());
207 // Resolve all the relocations we can.
208 Dyld.resolveRelocations();
209 // Clear instruction cache before code will be executed.
210 MemMgr.invalidateInstructionCache();
212 // FIXME: Error out if there are unresolved relocations.
214 // Get the address of the entry point (_main by default).
215 void *MainAddress = Dyld.getSymbolAddress(EntryPoint);
216 if (MainAddress == 0)
217 return Error("no definition for '" + EntryPoint + "'");
219 // Invalidate the instruction cache for each loaded function.
220 for (unsigned i = 0, e = MemMgr.FunctionMemory.size(); i != e; ++i) {
221 sys::MemoryBlock &Data = MemMgr.FunctionMemory[i];
222 // Make sure the memory is executable.
223 std::string ErrorStr;
224 sys::Memory::InvalidateInstructionCache(Data.base(), Data.size());
225 if (!sys::Memory::setExecutable(Data, &ErrorStr))
226 return Error("unable to mark function executable: '" + ErrorStr + "'");
229 // Dispatch to _main().
230 errs() << "loaded '" << EntryPoint << "' at: " << (void*)MainAddress << "\n";
232 int (*Main)(int, const char**) =
233 (int(*)(int,const char**)) uintptr_t(MainAddress);
234 const char **Argv = new const char*[2];
235 // Use the name of the first input object module as argv[0] for the target.
236 Argv[0] = InputFileList[0].c_str();
238 return Main(1, Argv);
241 int main(int argc, char **argv) {
242 ProgramName = argv[0];
243 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
245 cl::ParseCommandLineOptions(argc, argv, "llvm MC-JIT tool\n");
249 return executeInput();
250 case AC_PrintLineInfo:
251 return printLineInfoForInput();