X-Git-Url: http://demsky.eecs.uci.edu/git/?a=blobdiff_plain;f=tools%2Flli%2Flli.cpp;h=50711e7a2ecd0e434f5bc79a64e7fbd4feda3fbb;hb=875710a2fd6b3c4f814961582594bd5c1cdb493a;hp=49fb852f2222c86c3260a671e3e237a5954c2a50;hpb=13ec702c430b91ee49b9e6d9581cd95412f216c8;p=oota-llvm.git diff --git a/tools/lli/lli.cpp b/tools/lli/lli.cpp index 49fb852f222..13472214dfb 100644 --- a/tools/lli/lli.cpp +++ b/tools/lli/lli.cpp @@ -2,35 +2,71 @@ // // The LLVM Compiler Infrastructure // -// This file was developed by the LLVM research group and is distributed under -// the University of Illinois Open Source License. See LICENSE.TXT for details. +// This file is distributed under the University of Illinois Open Source +// License. See LICENSE.TXT for details. // //===----------------------------------------------------------------------===// // // This utility provides a simple wrapper around the LLVM Execution Engines, // which allow the direct execution of LLVM programs through a Just-In-Time -// compiler, or through an intepreter if no JIT is available for this platform. +// compiler, or through an interpreter if no JIT is available for this platform. // //===----------------------------------------------------------------------===// -#include "llvm/Module.h" -#include "llvm/ModuleProvider.h" -#include "llvm/Type.h" -#include "llvm/Bytecode/Reader.h" -#include "llvm/Codegen/LinkAllCodegenComponents.h" -#include "llvm/ExecutionEngine/JIT.h" -#include "llvm/ExecutionEngine/Interpreter.h" +#include "llvm/IR/LLVMContext.h" +#include "RemoteMemoryManager.h" +#include "RemoteTarget.h" +#include "RemoteTargetExternal.h" +#include "llvm/ADT/Triple.h" +#include "llvm/Bitcode/ReaderWriter.h" +#include "llvm/CodeGen/LinkAllCodegenComponents.h" #include "llvm/ExecutionEngine/GenericValue.h" +#include "llvm/ExecutionEngine/Interpreter.h" +#include "llvm/ExecutionEngine/JITEventListener.h" +#include "llvm/ExecutionEngine/JITMemoryManager.h" +#include "llvm/ExecutionEngine/MCJIT.h" +#include "llvm/ExecutionEngine/ObjectCache.h" +#include "llvm/ExecutionEngine/SectionMemoryManager.h" +#include "llvm/IR/IRBuilder.h" +#include "llvm/IR/Module.h" +#include "llvm/IR/Type.h" +#include "llvm/IR/TypeBuilder.h" +#include "llvm/IRReader/IRReader.h" +#include "llvm/Object/Archive.h" +#include "llvm/Object/ObjectFile.h" #include "llvm/Support/CommandLine.h" +#include "llvm/Support/Debug.h" +#include "llvm/Support/DynamicLibrary.h" +#include "llvm/Support/Format.h" +#include "llvm/Support/ManagedStatic.h" +#include "llvm/Support/MathExtras.h" +#include "llvm/Support/Memory.h" +#include "llvm/Support/MemoryBuffer.h" #include "llvm/Support/PluginLoader.h" -#include "llvm/System/Signals.h" -#include +#include "llvm/Support/PrettyStackTrace.h" +#include "llvm/Support/Process.h" +#include "llvm/Support/Program.h" +#include "llvm/Support/Signals.h" +#include "llvm/Support/SourceMgr.h" +#include "llvm/Support/TargetSelect.h" +#include "llvm/Support/raw_ostream.h" +#include "llvm/Transforms/Instrumentation.h" +#include + +#ifdef __CYGWIN__ +#include +#if defined(CYGWIN_VERSION_DLL_MAJOR) && CYGWIN_VERSION_DLL_MAJOR<1007 +#define DO_NOTHING_ATEXIT 1 +#endif +#endif using namespace llvm; +#define DEBUG_TYPE "lli" + namespace { cl::opt - InputFile(cl::desc(""), cl::Positional, cl::init("-")); + InputFile(cl::desc(""), cl::Positional, cl::init("-")); cl::list InputArgv(cl::ConsumeAfter, cl::desc("...")); @@ -38,94 +74,624 @@ namespace { cl::opt ForceInterpreter("force-interpreter", cl::desc("Force interpretation: disable JIT"), cl::init(false)); + + cl::opt DebugIR( + "debug-ir", cl::desc("Generate debug information to allow debugging IR."), + cl::init(false)); + + // The MCJIT supports building for a target address space separate from + // the JIT compilation process. Use a forked process and a copying + // memory manager with IPC to execute using this functionality. + cl::opt RemoteMCJIT("remote-mcjit", + cl::desc("Execute MCJIT'ed code in a separate process."), + cl::init(false)); + + // Manually specify the child process for remote execution. This overrides + // the simulated remote execution that allocates address space for child + // execution. The child process will be executed and will communicate with + // lli via stdin/stdout pipes. + cl::opt + ChildExecPath("mcjit-remote-process", + cl::desc("Specify the filename of the process to launch " + "for remote MCJIT execution. If none is specified," + "\n\tremote execution will be simulated in-process."), + cl::value_desc("filename"), cl::init("")); + + // Determine optimization level. + cl::opt + OptLevel("O", + cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] " + "(default = '-O2')"), + cl::Prefix, + cl::ZeroOrMore, + cl::init(' ')); + cl::opt TargetTriple("mtriple", cl::desc("Override target triple for module")); - + + cl::opt + MArch("march", + cl::desc("Architecture to generate assembly for (see --version)")); + + cl::opt + MCPU("mcpu", + cl::desc("Target a specific cpu type (-mcpu=help for details)"), + cl::value_desc("cpu-name"), + cl::init("")); + + cl::list + MAttrs("mattr", + cl::CommaSeparated, + cl::desc("Target specific attributes (-mattr=help for details)"), + cl::value_desc("a1,+a2,-a3,...")); + + cl::opt + EntryFunc("entry-function", + cl::desc("Specify the entry function (default = 'main') " + "of the executable"), + cl::value_desc("function"), + cl::init("main")); + + cl::list + ExtraModules("extra-module", + cl::desc("Extra modules to be loaded"), + cl::value_desc("input bitcode")); + + cl::list + ExtraObjects("extra-object", + cl::desc("Extra object files to be loaded"), + cl::value_desc("input object")); + + cl::list + ExtraArchives("extra-archive", + cl::desc("Extra archive files to be loaded"), + cl::value_desc("input archive")); + + cl::opt + EnableCacheManager("enable-cache-manager", + cl::desc("Use cache manager to save/load mdoules"), + cl::init(false)); + + cl::opt + ObjectCacheDir("object-cache-dir", + cl::desc("Directory to store cached object files " + "(must be user writable)"), + cl::init("")); + cl::opt FakeArgv0("fake-argv0", cl::desc("Override the 'argv[0]' value passed into the executing" " program"), cl::value_desc("executable")); + + cl::opt + DisableCoreFiles("disable-core-files", cl::Hidden, + cl::desc("Disable emission of core files if possible")); + + cl::opt + NoLazyCompilation("disable-lazy-compilation", + cl::desc("Disable JIT lazy compilation"), + cl::init(false)); + + cl::opt + RelocModel("relocation-model", + cl::desc("Choose relocation model"), + cl::init(Reloc::Default), + cl::values( + clEnumValN(Reloc::Default, "default", + "Target default relocation model"), + clEnumValN(Reloc::Static, "static", + "Non-relocatable code"), + clEnumValN(Reloc::PIC_, "pic", + "Fully relocatable, position independent code"), + clEnumValN(Reloc::DynamicNoPIC, "dynamic-no-pic", + "Relocatable external references, non-relocatable code"), + clEnumValEnd)); + + cl::opt + CMModel("code-model", + cl::desc("Choose code model"), + cl::init(CodeModel::JITDefault), + cl::values(clEnumValN(CodeModel::JITDefault, "default", + "Target default JIT code model"), + clEnumValN(CodeModel::Small, "small", + "Small code model"), + clEnumValN(CodeModel::Kernel, "kernel", + "Kernel code model"), + clEnumValN(CodeModel::Medium, "medium", + "Medium code model"), + clEnumValN(CodeModel::Large, "large", + "Large code model"), + clEnumValEnd)); + + cl::opt + GenerateSoftFloatCalls("soft-float", + cl::desc("Generate software floating point library calls"), + cl::init(false)); + + cl::opt + FloatABIForCalls("float-abi", + cl::desc("Choose float ABI type"), + cl::init(FloatABI::Default), + cl::values( + clEnumValN(FloatABI::Default, "default", + "Target default float ABI type"), + clEnumValN(FloatABI::Soft, "soft", + "Soft float ABI (implied by -soft-float)"), + clEnumValN(FloatABI::Hard, "hard", + "Hard float ABI (uses FP registers)"), + clEnumValEnd)); + cl::opt +// In debug builds, make this default to true. +#ifdef NDEBUG +#define EMIT_DEBUG false +#else +#define EMIT_DEBUG true +#endif + EmitJitDebugInfo("jit-emit-debug", + cl::desc("Emit debug information to debugger"), + cl::init(EMIT_DEBUG)); +#undef EMIT_DEBUG + + static cl::opt + EmitJitDebugInfoToDisk("jit-emit-debug-to-disk", + cl::Hidden, + cl::desc("Emit debug info objfiles to disk"), + cl::init(false)); } +//===----------------------------------------------------------------------===// +// Object cache +// +// This object cache implementation writes cached objects to disk to the +// directory specified by CacheDir, using a filename provided in the module +// descriptor. The cache tries to load a saved object using that path if the +// file exists. CacheDir defaults to "", in which case objects are cached +// alongside their originating bitcodes. +// +class LLIObjectCache : public ObjectCache { +public: + LLIObjectCache(const std::string& CacheDir) : CacheDir(CacheDir) { + // Add trailing '/' to cache dir if necessary. + if (!this->CacheDir.empty() && + this->CacheDir[this->CacheDir.size() - 1] != '/') + this->CacheDir += '/'; + } + virtual ~LLIObjectCache() {} + + void notifyObjectCompiled(const Module *M, const MemoryBuffer *Obj) override { + const std::string ModuleID = M->getModuleIdentifier(); + std::string CacheName; + if (!getCacheFilename(ModuleID, CacheName)) + return; + std::string errStr; + if (!CacheDir.empty()) { // Create user-defined cache dir. + SmallString<128> dir(CacheName); + sys::path::remove_filename(dir); + sys::fs::create_directories(Twine(dir)); + } + raw_fd_ostream outfile(CacheName.c_str(), errStr, sys::fs::F_None); + outfile.write(Obj->getBufferStart(), Obj->getBufferSize()); + outfile.close(); + } + + MemoryBuffer* getObject(const Module* M) override { + const std::string ModuleID = M->getModuleIdentifier(); + std::string CacheName; + if (!getCacheFilename(ModuleID, CacheName)) + return nullptr; + // Load the object from the cache filename + ErrorOr> IRObjectBuffer = + MemoryBuffer::getFile(CacheName.c_str(), -1, false); + // If the file isn't there, that's OK. + if (!IRObjectBuffer) + return nullptr; + // MCJIT will want to write into this buffer, and we don't want that + // because the file has probably just been mmapped. Instead we make + // a copy. The filed-based buffer will be released when it goes + // out of scope. + return MemoryBuffer::getMemBufferCopy(IRObjectBuffer.get()->getBuffer()); + } + +private: + std::string CacheDir; + + bool getCacheFilename(const std::string &ModID, std::string &CacheName) { + std::string Prefix("file:"); + size_t PrefixLength = Prefix.length(); + if (ModID.substr(0, PrefixLength) != Prefix) + return false; + std::string CacheSubdir = ModID.substr(PrefixLength); +#if defined(_WIN32) + // Transform "X:\foo" => "/X\foo" for convenience. + if (isalpha(CacheSubdir[0]) && CacheSubdir[1] == ':') { + CacheSubdir[1] = CacheSubdir[0]; + CacheSubdir[0] = '/'; + } +#endif + CacheName = CacheDir + CacheSubdir; + size_t pos = CacheName.rfind('.'); + CacheName.replace(pos, CacheName.length() - pos, ".o"); + return true; + } +}; + +static ExecutionEngine *EE = nullptr; +static LLIObjectCache *CacheManager = nullptr; + +static void do_shutdown() { + // Cygwin-1.5 invokes DLL's dtors before atexit handler. +#ifndef DO_NOTHING_ATEXIT + delete EE; + if (CacheManager) + delete CacheManager; + llvm_shutdown(); +#endif +} + +// On Mingw and Cygwin, an external symbol named '__main' is called from the +// generated 'main' function to allow static intialization. To avoid linking +// problems with remote targets (because lli's remote target support does not +// currently handle external linking) we add a secondary module which defines +// an empty '__main' function. +static void addCygMingExtraModule(ExecutionEngine *EE, + LLVMContext &Context, + StringRef TargetTripleStr) { + IRBuilder<> Builder(Context); + Triple TargetTriple(TargetTripleStr); + + // Create a new module. + Module *M = new Module("CygMingHelper", Context); + M->setTargetTriple(TargetTripleStr); + + // Create an empty function named "__main". + Function *Result; + if (TargetTriple.isArch64Bit()) { + Result = Function::Create( + TypeBuilder::get(Context), + GlobalValue::ExternalLinkage, "__main", M); + } else { + Result = Function::Create( + TypeBuilder::get(Context), + GlobalValue::ExternalLinkage, "__main", M); + } + BasicBlock *BB = BasicBlock::Create(Context, "__main", Result); + Builder.SetInsertPoint(BB); + Value *ReturnVal; + if (TargetTriple.isArch64Bit()) + ReturnVal = ConstantInt::get(Context, APInt(64, 0)); + else + ReturnVal = ConstantInt::get(Context, APInt(32, 0)); + Builder.CreateRet(ReturnVal); + + // Add this new module to the ExecutionEngine. + EE->addModule(M); +} + + //===----------------------------------------------------------------------===// // main Driver function // int main(int argc, char **argv, char * const *envp) { - try { - cl::ParseCommandLineOptions(argc, argv, - " llvm interpreter & dynamic compiler\n"); - sys::PrintStackTraceOnErrorSignal(); - - // Load the bytecode... - std::string ErrorMsg; - ModuleProvider *MP = 0; - try { - MP = getBytecodeModuleProvider(InputFile); - } catch (std::string &err) { - std::cerr << "Error loading program '" << InputFile << "': " - << err << "\n"; + sys::PrintStackTraceOnErrorSignal(); + PrettyStackTraceProgram X(argc, argv); + + LLVMContext &Context = getGlobalContext(); + atexit(do_shutdown); // Call llvm_shutdown() on exit. + + // If we have a native target, initialize it to ensure it is linked in and + // usable by the JIT. + InitializeNativeTarget(); + InitializeNativeTargetAsmPrinter(); + InitializeNativeTargetAsmParser(); + + cl::ParseCommandLineOptions(argc, argv, + "llvm interpreter & dynamic compiler\n"); + + // If the user doesn't want core files, disable them. + if (DisableCoreFiles) + sys::Process::PreventCoreFiles(); + + // Load the bitcode... + SMDiagnostic Err; + Module *Mod = ParseIRFile(InputFile, Err, Context); + if (!Mod) { + Err.print(argv[0], errs()); + return 1; + } + + if (EnableCacheManager) { + std::string CacheName("file:"); + CacheName.append(InputFile); + Mod->setModuleIdentifier(CacheName); + } + + // If not jitting lazily, load the whole bitcode file eagerly too. + if (NoLazyCompilation) { + if (std::error_code EC = Mod->materializeAllPermanently()) { + errs() << argv[0] << ": bitcode didn't read correctly.\n"; + errs() << "Reason: " << EC.message() << "\n"; exit(1); } + } - // If we are supposed to override the target triple, do so now. - if (!TargetTriple.empty()) - MP->getModule()->setTargetTriple(TargetTriple); - - ExecutionEngine *EE = ExecutionEngine::create(MP, ForceInterpreter); - assert(EE &&"Couldn't create an ExecutionEngine, not even an interpreter?"); - - // If the user specifically requested an argv[0] to pass into the program, - // do it now. - if (!FakeArgv0.empty()) { - InputFile = FakeArgv0; - } else { - // Otherwise, if there is a .bc suffix on the executable strip it off, it - // might confuse the program. - if (InputFile.rfind(".bc") == InputFile.length() - 3) - InputFile.erase(InputFile.length() - 3); + if (DebugIR) { + ModulePass *DebugIRPass = createDebugIRPass(); + DebugIRPass->runOnModule(*Mod); + } + + std::string ErrorMsg; + EngineBuilder builder(Mod); + builder.setMArch(MArch); + builder.setMCPU(MCPU); + builder.setMAttrs(MAttrs); + builder.setRelocationModel(RelocModel); + builder.setCodeModel(CMModel); + builder.setErrorStr(&ErrorMsg); + builder.setEngineKind(ForceInterpreter + ? EngineKind::Interpreter + : EngineKind::JIT); + + // If we are supposed to override the target triple, do so now. + if (!TargetTriple.empty()) + Mod->setTargetTriple(Triple::normalize(TargetTriple)); + + // Enable MCJIT if desired. + RTDyldMemoryManager *RTDyldMM = nullptr; + if (!ForceInterpreter) { + if (RemoteMCJIT) + RTDyldMM = new RemoteMemoryManager(); + else + RTDyldMM = new SectionMemoryManager(); + builder.setMCJITMemoryManager(RTDyldMM); + } else { + if (RemoteMCJIT) { + errs() << "error: Remote process execution requires -use-mcjit\n"; + exit(1); } + builder.setJITMemoryManager(ForceInterpreter ? nullptr : + JITMemoryManager::CreateDefaultMemManager()); + } - // Add the module's name to the start of the vector of arguments to main(). - InputArgv.insert(InputArgv.begin(), InputFile); + CodeGenOpt::Level OLvl = CodeGenOpt::Default; + switch (OptLevel) { + default: + errs() << argv[0] << ": invalid optimization level.\n"; + return 1; + case ' ': break; + case '0': OLvl = CodeGenOpt::None; break; + case '1': OLvl = CodeGenOpt::Less; break; + case '2': OLvl = CodeGenOpt::Default; break; + case '3': OLvl = CodeGenOpt::Aggressive; break; + } + builder.setOptLevel(OLvl); - // Call the main function from M as if its signature were: - // int main (int argc, char **argv, const char **envp) - // using the contents of Args to determine argc & argv, and the contents of - // EnvVars to determine envp. - // - Function *Fn = MP->getModule()->getMainFunction(); - if (!Fn) { - std::cerr << "'main' function not found in module.\n"; - return -1; + TargetOptions Options; + Options.UseSoftFloat = GenerateSoftFloatCalls; + if (FloatABIForCalls != FloatABI::Default) + Options.FloatABIType = FloatABIForCalls; + if (GenerateSoftFloatCalls) + FloatABIForCalls = FloatABI::Soft; + + // Remote target execution doesn't handle EH or debug registration. + if (!RemoteMCJIT) { + Options.JITEmitDebugInfo = EmitJitDebugInfo; + Options.JITEmitDebugInfoToDisk = EmitJitDebugInfoToDisk; + } + + builder.setTargetOptions(Options); + + EE = builder.create(); + if (!EE) { + if (!ErrorMsg.empty()) + errs() << argv[0] << ": error creating EE: " << ErrorMsg << "\n"; + else + errs() << argv[0] << ": unknown error creating EE!\n"; + exit(1); + } + + if (EnableCacheManager) { + CacheManager = new LLIObjectCache(ObjectCacheDir); + EE->setObjectCache(CacheManager); + } + + // Load any additional modules specified on the command line. + for (unsigned i = 0, e = ExtraModules.size(); i != e; ++i) { + Module *XMod = ParseIRFile(ExtraModules[i], Err, Context); + if (!XMod) { + Err.print(argv[0], errs()); + return 1; + } + if (EnableCacheManager) { + std::string CacheName("file:"); + CacheName.append(ExtraModules[i]); + XMod->setModuleIdentifier(CacheName); + } + EE->addModule(XMod); + } + + for (unsigned i = 0, e = ExtraObjects.size(); i != e; ++i) { + ErrorOr> Obj = + object::ObjectFile::createObjectFile(ExtraObjects[i]); + if (!Obj) { + Err.print(argv[0], errs()); + return 1; + } + EE->addObjectFile(std::move(Obj.get())); + } + + for (unsigned i = 0, e = ExtraArchives.size(); i != e; ++i) { + ErrorOr> ArBuf = + MemoryBuffer::getFileOrSTDIN(ExtraArchives[i]); + if (!ArBuf) { + Err.print(argv[0], errs()); + return 1; + } + + ErrorOr> ArOrErr = + object::Archive::create(std::move(ArBuf.get())); + if (std::error_code EC = ArOrErr.getError()) { + errs() << EC.message(); + return 1; } + EE->addArchive(std::move(ArOrErr.get())); + } + + // If the target is Cygwin/MingW and we are generating remote code, we + // need an extra module to help out with linking. + if (RemoteMCJIT && Triple(Mod->getTargetTriple()).isOSCygMing()) { + addCygMingExtraModule(EE, Context, Mod->getTargetTriple()); + } + + // The following functions have no effect if their respective profiling + // support wasn't enabled in the build configuration. + EE->RegisterJITEventListener( + JITEventListener::createOProfileJITEventListener()); + EE->RegisterJITEventListener( + JITEventListener::createIntelJITEventListener()); + + if (!NoLazyCompilation && RemoteMCJIT) { + errs() << "warning: remote mcjit does not support lazy compilation\n"; + NoLazyCompilation = true; + } + EE->DisableLazyCompilation(NoLazyCompilation); + + // If the user specifically requested an argv[0] to pass into the program, + // do it now. + if (!FakeArgv0.empty()) { + InputFile = FakeArgv0; + } else { + // Otherwise, if there is a .bc suffix on the executable strip it off, it + // might confuse the program. + if (StringRef(InputFile).endswith(".bc")) + InputFile.erase(InputFile.length() - 3); + } + + // Add the module's name to the start of the vector of arguments to main(). + InputArgv.insert(InputArgv.begin(), InputFile); + + // Call the main function from M as if its signature were: + // int main (int argc, char **argv, const char **envp) + // using the contents of Args to determine argc & argv, and the contents of + // EnvVars to determine envp. + // + Function *EntryFn = Mod->getFunction(EntryFunc); + if (!EntryFn) { + errs() << '\'' << EntryFunc << "\' function not found in module.\n"; + return -1; + } + + // Reset errno to zero on entry to main. + errno = 0; + + int Result; + + if (!RemoteMCJIT) { + // If the program doesn't explicitly call exit, we will need the Exit + // function later on to make an explicit call, so get the function now. + Constant *Exit = Mod->getOrInsertFunction("exit", Type::getVoidTy(Context), + Type::getInt32Ty(Context), + NULL); // Run static constructors. + if (!ForceInterpreter) { + // Give MCJIT a chance to apply relocations and set page permissions. + EE->finalizeObject(); + } EE->runStaticConstructorsDestructors(false); - + + // Trigger compilation separately so code regions that need to be + // invalidated will be known. + (void)EE->getPointerToFunction(EntryFn); + // Clear instruction cache before code will be executed. + if (RTDyldMM) + static_cast(RTDyldMM)->invalidateInstructionCache(); + // Run main. - int Result = EE->runFunctionAsMain(Fn, InputArgv, envp); + Result = EE->runFunctionAsMain(EntryFn, InputArgv, envp); // Run static destructors. EE->runStaticConstructorsDestructors(true); - - // If the program didn't explicitly call exit, call exit now, for the - // program. This ensures that any atexit handlers get called correctly. - Function *Exit = MP->getModule()->getOrInsertFunction("exit", Type::VoidTy, - Type::IntTy, - (Type *)0); - - std::vector Args; - GenericValue ResultGV; - ResultGV.IntVal = Result; - Args.push_back(ResultGV); - EE->runFunction(Exit, Args); - - std::cerr << "ERROR: exit(" << Result << ") returned!\n"; - abort(); - } catch (const std::string& msg) { - std::cerr << argv[0] << ": " << msg << "\n"; - } catch (...) { - std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n"; - } - abort(); + + // If the program didn't call exit explicitly, we should call it now. + // This ensures that any atexit handlers get called correctly. + if (Function *ExitF = dyn_cast(Exit)) { + std::vector Args; + GenericValue ResultGV; + ResultGV.IntVal = APInt(32, Result); + Args.push_back(ResultGV); + EE->runFunction(ExitF, Args); + errs() << "ERROR: exit(" << Result << ") returned!\n"; + abort(); + } else { + errs() << "ERROR: exit defined with wrong prototype!\n"; + abort(); + } + } else { + // else == "if (RemoteMCJIT)" + + // Remote target MCJIT doesn't (yet) support static constructors. No reason + // it couldn't. This is a limitation of the LLI implemantation, not the + // MCJIT itself. FIXME. + // + RemoteMemoryManager *MM = static_cast(RTDyldMM); + // Everything is prepared now, so lay out our program for the target + // address space, assign the section addresses to resolve any relocations, + // and send it to the target. + + std::unique_ptr Target; + if (!ChildExecPath.empty()) { // Remote execution on a child process +#ifndef LLVM_ON_UNIX + // FIXME: Remove this pointless fallback mode which causes tests to "pass" + // on platforms where they should XFAIL. + errs() << "Warning: host does not support external remote targets.\n" + << " Defaulting to simulated remote execution\n"; + Target.reset(new RemoteTarget); +#else + if (!sys::fs::can_execute(ChildExecPath)) { + errs() << "Unable to find usable child executable: '" << ChildExecPath + << "'\n"; + return -1; + } + Target.reset(new RemoteTargetExternal(ChildExecPath)); +#endif + } else { + // No child process name provided, use simulated remote execution. + Target.reset(new RemoteTarget); + } + + // Give the memory manager a pointer to our remote target interface object. + MM->setRemoteTarget(Target.get()); + + // Create the remote target. + if (!Target->create()) { + errs() << "ERROR: " << Target->getErrorMsg() << "\n"; + return EXIT_FAILURE; + } + + // Since we're executing in a (at least simulated) remote address space, + // we can't use the ExecutionEngine::runFunctionAsMain(). We have to + // grab the function address directly here and tell the remote target + // to execute the function. + // + // Our memory manager will map generated code into the remote address + // space as it is loaded and copy the bits over during the finalizeMemory + // operation. + // + // FIXME: argv and envp handling. + uint64_t Entry = EE->getFunctionAddress(EntryFn->getName().str()); + + DEBUG(dbgs() << "Executing '" << EntryFn->getName() << "' at 0x" + << format("%llx", Entry) << "\n"); + + if (!Target->executeCode(Entry, Result)) + errs() << "ERROR: " << Target->getErrorMsg() << "\n"; + + // Like static constructors, the remote target MCJIT support doesn't handle + // this yet. It could. FIXME. + + // Stop the remote target + Target->stop(); + } + + return Result; }