//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
//
-// This utility provides a way to execute LLVM bytecode without static
-// compilation. This consists of a very simple and slow (but portable)
-// interpreter, along with capability for system specific dynamic compilers. At
-// runtime, the fastest (stable) execution engine is selected to run the
-// program. This means the JIT compiler for the current platform if it's
-// available.
+// The LLVM Compiler Infrastructure
+//
+// 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 interpreter if no JIT is available for this platform.
//
//===----------------------------------------------------------------------===//
-#include "ExecutionEngine.h"
-#include "Support/CommandLine.h"
-#include "llvm/Bytecode/Reader.h"
+#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
-#include "llvm/Target/TargetMachineImpls.h"
+#include "llvm/ModuleProvider.h"
+#include "llvm/Type.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/CodeGen/LinkAllCodegenComponents.h"
+#include "llvm/ExecutionEngine/GenericValue.h"
+#include "llvm/ExecutionEngine/Interpreter.h"
+#include "llvm/ExecutionEngine/JIT.h"
+#include "llvm/ExecutionEngine/JITEventListener.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/PluginLoader.h"
+#include "llvm/Support/PrettyStackTrace.h"
+#include "llvm/System/Process.h"
+#include "llvm/System/Signals.h"
+#include "llvm/Target/TargetSelect.h"
+#include <iostream>
+#include <cerrno>
+using namespace llvm;
namespace {
cl::opt<std::string>
- InputFile(cl::desc("<input bytecode>"), cl::Positional, cl::init("-"));
+ InputFile(cl::desc("<input bitcode>"), cl::Positional, cl::init("-"));
cl::list<std::string>
InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
- cl::opt<std::string>
- MainFunction ("f", cl::desc("Function to execute"), cl::init("main"),
- cl::value_desc("function name"));
-
- cl::opt<bool> DebugMode("d", cl::desc("Start program in debugger"));
+ cl::opt<bool> ForceInterpreter("force-interpreter",
+ cl::desc("Force interpretation: disable JIT"),
+ cl::init(false));
+
+ // Determine optimization level.
+ cl::opt<char>
+ OptLevel("O",
+ cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
+ "(default = '-O2')"),
+ cl::Prefix,
+ cl::ZeroOrMore,
+ cl::init(' '));
- cl::opt<bool> TraceMode("trace", cl::desc("Enable Tracing"));
+ cl::opt<std::string>
+ TargetTriple("mtriple", cl::desc("Override target triple for module"));
- cl::opt<bool> ForceInterpreter("force-interpreter",
- cl::desc("Force interpretation: disable JIT"),
- cl::init(false));
+ cl::opt<std::string>
+ EntryFunc("entry-function",
+ cl::desc("Specify the entry function (default = 'main') "
+ "of the executable"),
+ cl::value_desc("function"),
+ cl::init("main"));
+
+ cl::opt<std::string>
+ FakeArgv0("fake-argv0",
+ cl::desc("Override the 'argv[0]' value passed into the executing"
+ " program"), cl::value_desc("executable"));
+
+ cl::opt<bool>
+ DisableCoreFiles("disable-core-files", cl::Hidden,
+ cl::desc("Disable emission of core files if possible"));
+
+ cl::opt<bool>
+ NoLazyCompilation("disable-lazy-compilation",
+ cl::desc("Disable JIT lazy compilation"),
+ cl::init(false));
}
-//===----------------------------------------------------------------------===//
-// ExecutionEngine Class Implementation
-//
+static ExecutionEngine *EE = 0;
-ExecutionEngine::~ExecutionEngine() {
- delete &CurMod;
+static void do_shutdown() {
+ delete EE;
+ llvm_shutdown();
}
//===----------------------------------------------------------------------===//
// main Driver function
//
-int main(int argc, char** argv) {
+int main(int argc, char **argv, char * const *envp) {
+ sys::PrintStackTraceOnErrorSignal();
+ PrettyStackTraceProgram X(argc, argv);
+
+ LLVMContext Context;
+ atexit(do_shutdown); // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv,
- " llvm interpreter & dynamic compiler\n");
+ "llvm interpreter & dynamic compiler\n");
- // Load the bytecode...
+ // If the user doesn't want core files, disable them.
+ if (DisableCoreFiles)
+ sys::Process::PreventCoreFiles();
+
+ // Load the bitcode...
std::string ErrorMsg;
- Module *M = ParseBytecodeFile(InputFile, &ErrorMsg);
- if (M == 0) {
- std::cout << "Error parsing '" << InputFile << "': "
- << ErrorMsg << "\n";
+ ModuleProvider *MP = NULL;
+ if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFile,&ErrorMsg)){
+ MP = getBitcodeModuleProvider(Buffer, Context, &ErrorMsg);
+ if (!MP) delete Buffer;
+ }
+
+ if (!MP) {
+ errs() << argv[0] << ": error loading program '" << InputFile << "': "
+ << ErrorMsg << "\n";
exit(1);
}
-#if 0
- // Link in the runtime library for LLI...
- std::string RuntimeLib = getCurrentExecutablePath();
- if (!RuntimeLib.empty()) RuntimeLib += "/";
- RuntimeLib += "RuntimeLib.bc";
+ // Get the module as the MP could go away once EE takes over.
+ Module *Mod = NoLazyCompilation
+ ? MP->materializeModule(&ErrorMsg) : MP->getModule();
+ if (!Mod) {
+ errs() << argv[0] << ": bitcode didn't read correctly.\n";
+ errs() << "Reason: " << ErrorMsg << "\n";
+ exit(1);
+ }
- if (Module *SupportLib = ParseBytecodeFile(RuntimeLib, &ErrorMsg)) {
- if (LinkModules(M, SupportLib, &ErrorMsg))
- std::cerr << "Error Linking runtime library into current module: "
- << ErrorMsg << "\n";
- } else {
- std::cerr << "Error loading runtime library '"+RuntimeLib+"': "
- << ErrorMsg << "\n";
+ // If we are supposed to override the target triple, do so now.
+ if (!TargetTriple.empty())
+ Mod->setTargetTriple(TargetTriple);
+
+ 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':
+ case '2': OLvl = CodeGenOpt::Default; break;
+ case '3': OLvl = CodeGenOpt::Aggressive; break;
+ }
+
+ // If we have a native target, initialize it to ensure it is linked in and
+ // usable by the JIT.
+ InitializeNativeTarget();
+
+ EE = ExecutionEngine::create(MP, ForceInterpreter, &ErrorMsg, OLvl);
+ if (!EE) {
+ if (!ErrorMsg.empty())
+ errs() << argv[0] << ": error creating EE: " << ErrorMsg << "\n";
+ else
+ errs() << argv[0] << ": unknown error creating EE!\n";
+ exit(1);
}
-#endif
- unsigned Config = (M->isLittleEndian() ? TM::LittleEndian : TM::BigEndian) |
- (M->has32BitPointers() ? TM::PtrSize32 : TM::PtrSize64);
- ExecutionEngine *EE = 0;
+ EE->RegisterJITEventListener(createMacOSJITEventListener());
+ EE->RegisterJITEventListener(createOProfileJITEventListener());
- // If there is nothing that is forcing us to use the interpreter, make a JIT.
- if (!ForceInterpreter && !DebugMode && !TraceMode)
- EE = ExecutionEngine::createJIT(M, Config);
+ if (NoLazyCompilation)
+ EE->DisableLazyCompilation();
- // If we can't make a JIT, make an interpreter instead.
- if (EE == 0)
- EE = ExecutionEngine::createInterpreter(M, Config, DebugMode, TraceMode);
+ // 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);
+ }
- // Add the module name to the start of the argv vector...
+ // Add the module's name to the start of the vector of arguments to main().
InputArgv.insert(InputArgv.begin(), InputFile);
- // Run the main function!
- int ExitCode = EE->run(MainFunction, InputArgv);
+ // 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;
+ }
- // Now that we are done executing the program, shut down the execution engine
- delete EE;
- return ExitCode;
+ // 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::VoidTy,
+ Type::Int32Ty, NULL);
+
+ // Reset errno to zero on entry to main.
+ errno = 0;
+
+ // Run static constructors.
+ EE->runStaticConstructorsDestructors(false);
+
+ if (NoLazyCompilation) {
+ for (Module::iterator I = Mod->begin(), E = Mod->end(); I != E; ++I) {
+ Function *Fn = &*I;
+ if (Fn != EntryFn && !Fn->isDeclaration())
+ EE->getPointerToFunction(Fn);
+ }
+ }
+
+ // Run main.
+ int Result = EE->runFunctionAsMain(EntryFn, InputArgv, envp);
+
+ // Run static destructors.
+ EE->runStaticConstructorsDestructors(true);
+
+ // 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<Function>(Exit)) {
+ std::vector<GenericValue> 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();
+ }
}
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