forked from OSchip/llvm-project
110 lines
3.1 KiB
C++
110 lines
3.1 KiB
C++
//===-- llvm-rtdyld.cpp - MCJIT Testing Tool ------------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This is a testing tool for use with the MC-JIT LLVM components.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/ADT/StringMap.h"
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#include "llvm/ADT/OwningPtr.h"
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#include "llvm/ExecutionEngine/JITMemoryManager.h"
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#include "llvm/ExecutionEngine/RuntimeDyld.h"
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#include "llvm/Object/MachOObject.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/Memory.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/system_error.h"
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using namespace llvm;
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using namespace llvm::object;
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static cl::opt<std::string>
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InputFile(cl::Positional, cl::desc("<input file>"), cl::init("-"));
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enum ActionType {
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AC_Execute
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};
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static cl::opt<ActionType>
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Action(cl::desc("Action to perform:"),
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cl::init(AC_Execute),
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cl::values(clEnumValN(AC_Execute, "execute",
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"Load, link, and execute the inputs."),
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clEnumValEnd));
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/* *** */
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static const char *ProgramName;
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static void Message(const char *Type, const Twine &Msg) {
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errs() << ProgramName << ": " << Type << ": " << Msg << "\n";
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}
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static int Error(const Twine &Msg) {
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Message("error", Msg);
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return 1;
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}
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/* *** */
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static int executeInput() {
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// Load the input memory buffer.
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OwningPtr<MemoryBuffer> InputBuffer;
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if (error_code ec = MemoryBuffer::getFileOrSTDIN(InputFile, InputBuffer))
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return Error("unable to read input: '" + ec.message() + "'");
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// Instantiate a dynamic linker.
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RuntimeDyld Dyld(JITMemoryManager::CreateDefaultMemManager());
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// Load the object file into it.
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if (Dyld.loadObject(InputBuffer.take())) {
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return Error(Dyld.getErrorString());
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}
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// Get the address of "_main".
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void *MainAddress = Dyld.getSymbolAddress("_main");
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if (MainAddress == 0)
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return Error("no definition for '_main'");
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// Invalidate the instruction cache.
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sys::MemoryBlock Data = Dyld.getMemoryBlock();
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sys::Memory::InvalidateInstructionCache(Data.base(), Data.size());
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// Make sure the memory is executable.
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std::string ErrorStr;
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if (!sys::Memory::setExecutable(Data, &ErrorStr))
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return Error("unable to mark function executable: '" + ErrorStr + "'");
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// Dispatch to _main().
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errs() << "loaded '_main' at: " << MainAddress << "\n";
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int (*Main)(int, const char**) =
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(int(*)(int,const char**)) uintptr_t(MainAddress);
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const char **Argv = new const char*[2];
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Argv[0] = InputFile.c_str();
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Argv[1] = 0;
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return Main(1, Argv);
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}
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int main(int argc, char **argv) {
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ProgramName = argv[0];
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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cl::ParseCommandLineOptions(argc, argv, "llvm MC-JIT tool\n");
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switch (Action) {
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default:
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case AC_Execute:
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return executeInput();
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}
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return 0;
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}
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