+//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
+//
+// 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.
+//
//===----------------------------------------------------------------------===//
-// LLVM INTERPRETER/DEBUGGER/PROFILER UTILITY
//
-// This utility is an interactive frontend to almost all other LLVM
-// functionality. It may be used as an interpreter to run code, a debugger to
-// find problems, or a profiler to analyze execution frequencies.
+// 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.
//
//===----------------------------------------------------------------------===//
-#include "Interpreter.h"
+#include "llvm/Module.h"
+#include "llvm/ModuleProvider.h"
+#include "llvm/Type.h"
+#include "llvm/Bitcode/ReaderWriter.h"
+#include "llvm/CodeGen/LinkAllCodegenComponents.h"
+#include "llvm/ExecutionEngine/JIT.h"
+#include "llvm/ExecutionEngine/Interpreter.h"
+#include "llvm/ExecutionEngine/GenericValue.h"
#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/MemoryBuffer.h"
+#include "llvm/Support/PluginLoader.h"
+#include "llvm/System/Process.h"
+#include "llvm/System/Signals.h"
+#include <iostream>
+#include <cerrno>
+using namespace llvm;
-cl::StringList InputArgv("" , "Input command line", cl::ConsumeAfter);
-cl::String MainFunction ("f" , "Function to execute", cl::NoFlags, "main");
-cl::Flag DebugMode ("debug" , "Start program in debugger");
-cl::Alias DebugModeA ("d" , "Alias for -debug", cl::NoFlags, DebugMode);
-cl::Flag TraceMode ("trace" , "Enable Tracing");
-cl::Flag ProfileMode ("profile", "Enable Profiling [unimp]");
+namespace {
+ cl::opt<std::string>
+ InputFile(cl::desc("<input bitcode>"), cl::Positional, cl::init("-"));
+ cl::list<std::string>
+ InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
-//===----------------------------------------------------------------------===//
-// Interpreter ctor - Initialize stuff
-//
-Interpreter::Interpreter() : ExitCode(0), Profile(ProfileMode),
- Trace(TraceMode), CurFrame(-1) {
- CurMod = 0;
- loadModule(InputArgv.size() ? InputArgv[0] : "-");
+ cl::opt<bool> ForceInterpreter("force-interpreter",
+ cl::desc("Force interpretation: disable JIT"),
+ cl::init(false));
+ cl::opt<std::string>
+ TargetTriple("mtriple", cl::desc("Override target triple for module"));
+
+ 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"));
+}
- // Initialize the "backend"
- initializeExecutionEngine();
- initializeExternalMethods();
+static ExecutionEngine *EE = 0;
+
+static void do_shutdown() {
+ delete EE;
+ llvm_shutdown();
}
//===----------------------------------------------------------------------===//
// main Driver function
//
-int main(int argc, char** argv) {
- cl::ParseCommandLineOptions(argc, argv, " llvm interpreter\n");
+int main(int argc, char **argv, char * const *envp) {
+ atexit(do_shutdown); // Call llvm_shutdown() on exit.
+ cl::ParseCommandLineOptions(argc, argv,
+ "llvm interpreter & dynamic compiler\n");
+ sys::PrintStackTraceOnErrorSignal();
- // Create the interpreter...
- Interpreter I;
+ // If the user doesn't want core files, disable them.
+ if (DisableCoreFiles)
+ sys::Process::PreventCoreFiles();
+
+ // Load the bitcode...
+ std::string ErrorMsg;
+ ModuleProvider *MP = 0;
+ if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFile,&ErrorMsg)){
+ MP = getBitcodeModuleProvider(Buffer, &ErrorMsg);
+ if (!MP) delete Buffer;
+ }
+
+ if (!MP) {
+ std::cerr << argv[0] << ": error loading program '" << InputFile << "': "
+ << ErrorMsg << "\n";
+ exit(1);
+ }
- // Handle alternate names of the program. If started as llp, enable profiling
- // if started as ldb, enable debugging...
- //
- if (argv[0] == "ldb") // TODO: Obviously incorrect, but you get the idea
- DebugMode = true;
- else if (argv[0] == "llp")
- ProfileMode = true;
+ // Get the module as the MP could go away once EE takes over.
+ Module *Mod = MP->getModule();
- // If running with the profiler, enable it now...
- if (ProfileMode) I.enableProfiling();
- if (TraceMode) I.enableTracing();
+ // If we are supposed to override the target triple, do so now.
+ if (!TargetTriple.empty())
+ Mod->setTargetTriple(TargetTriple);
+
+ EE = ExecutionEngine::create(MP, ForceInterpreter, &ErrorMsg);
+ if (!EE && !ErrorMsg.empty()) {
+ std::cerr << argv[0] << ":error creating EE: " << ErrorMsg << "\n";
+ exit(1);
+ }
- // Ensure that there is at least one argument... the name of the program.
- // This is only unavailable if the program was read from stdin, instead of a
- // file.
- //
- if (InputArgv.empty())
- InputArgv.push_back("from-stdin-prog");
+ // 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's name to the start of the vector of arguments to main().
+ InputArgv.insert(InputArgv.begin(), InputFile);
- // Start interpreter into the main function...
+ // 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.
//
- if (!I.callMainMethod(MainFunction, InputArgv) && !DebugMode) {
- // If not in debug mode and if the call succeeded, run the code now...
- I.run();
+ Function *Fn = Mod->getFunction("main");
+ if (!Fn) {
+ std::cerr << "'main' function not found in module.\n";
+ return -1;
}
- // If debug mode, allow the user to interact... also, if the user pressed
- // ctrl-c or execution hit an error, enter the event loop...
- if (DebugMode || I.isStopped())
- I.handleUserInput();
+ // 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);
+
+ // Run main.
+ int Result = EE->runFunctionAsMain(Fn, InputArgv, envp);
- // Return the status code of the program executed...
- return I.getExitCode();
+ // 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);
+ std::cerr << "ERROR: exit(" << Result << ") returned!\n";
+ abort();
+ } else {
+ std::cerr << "ERROR: exit defined with wrong prototype!\n";
+ abort();
+ }
}
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