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/StringMap.h"
15 #include "llvm/ADT/OwningPtr.h"
16 #include "llvm/ExecutionEngine/RuntimeDyld.h"
17 #include "llvm/Object/MachOObject.h"
18 #include "llvm/Support/CommandLine.h"
19 #include "llvm/Support/ManagedStatic.h"
20 #include "llvm/Support/Memory.h"
21 #include "llvm/Support/MemoryBuffer.h"
22 #include "llvm/Support/raw_ostream.h"
23 #include "llvm/Support/system_error.h"
25 using namespace llvm::object;
27 static cl::opt<std::string>
28 InputFile(cl::Positional, cl::desc("<input file>"), cl::init("-"));
34 static cl::opt<ActionType>
35 Action(cl::desc("Action to perform:"),
37 cl::values(clEnumValN(AC_Execute, "execute",
38 "Load, link, and execute the inputs."),
43 // A trivial memory manager that doesn't do anything fancy, just uses the
44 // support library allocation routines directly.
45 class TrivialMemoryManager : public RTDyldMemoryManager {
47 uint8_t *startFunctionBody(const char *Name, uintptr_t &Size);
48 void endFunctionBody(const char *Name, uint8_t *FunctionStart,
49 uint8_t *FunctionEnd) {}
52 uint8_t *TrivialMemoryManager::startFunctionBody(const char *Name,
54 return (uint8_t*)sys::Memory::AllocateRWX(Size, 0, 0).base();
57 static const char *ProgramName;
59 static void Message(const char *Type, const Twine &Msg) {
60 errs() << ProgramName << ": " << Type << ": " << Msg << "\n";
63 static int Error(const Twine &Msg) {
64 Message("error", Msg);
70 static int executeInput() {
71 // Load the input memory buffer.
72 OwningPtr<MemoryBuffer> InputBuffer;
73 if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFile, InputBuffer))
74 return Error("unable to read input: '" + ec.message() + "'");
76 // Instantiate a dynamic linker.
77 RuntimeDyld Dyld(new TrivialMemoryManager);
79 // Load the object file into it.
80 if (Dyld.loadObject(InputBuffer.take())) {
81 return Error(Dyld.getErrorString());
84 // Get the address of "_main".
85 void *MainAddress = Dyld.getSymbolAddress("_main");
87 return Error("no definition for '_main'");
89 // Invalidate the instruction cache.
90 sys::MemoryBlock Data = Dyld.getMemoryBlock();
91 sys::Memory::InvalidateInstructionCache(Data.base(), Data.size());
93 // Make sure the memory is executable.
95 if (!sys::Memory::setExecutable(Data, &ErrorStr))
96 return Error("unable to mark function executable: '" + ErrorStr + "'");
98 // Dispatch to _main().
99 errs() << "loaded '_main' at: " << (void*)MainAddress << "\n";
101 int (*Main)(int, const char**) =
102 (int(*)(int,const char**)) uintptr_t(MainAddress);
103 const char **Argv = new const char*[2];
104 Argv[0] = InputFile.c_str();
106 return Main(1, Argv);
109 int main(int argc, char **argv) {
110 ProgramName = argv[0];
111 llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
113 cl::ParseCommandLineOptions(argc, argv, "llvm MC-JIT tool\n");
118 return executeInput();