+//===- 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 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.
//
//===----------------------------------------------------------------------===//
-#include "Interpreter.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/Module.h"
+#include "llvm/ModuleProvider.h"
+#include "llvm/Bytecode/Reader.h"
+#include "llvm/ExecutionEngine/ExecutionEngine.h"
+#include "llvm/ExecutionEngine/GenericValue.h"
+#include "llvm/Target/TargetMachineImpls.h"
+#include "llvm/Target/TargetData.h"
#include "Support/CommandLine.h"
+#include "Support/Debug.h"
+#include "Support/SystemUtils.h"
-static cl::opt<std::string>
-InputFile(cl::desc("<input bytecode>"), cl::Positional, cl::init("-"));
+using namespace llvm;
-static cl::list<std::string>
-InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
+namespace {
+ cl::opt<std::string>
+ InputFile(cl::desc("<input bytecode>"), cl::Positional, cl::init("-"));
-static cl::opt<std::string>
-MainFunction ("f", cl::desc("Function to execute"), cl::init("main"),
- cl::value_desc("function name"));
+ cl::list<std::string>
+ InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
-static cl::opt<bool>
-DebugMode("d", cl::desc("Start program in debugger"));
+ cl::opt<std::string>
+ MainFunction("f", cl::desc("Function to execute"), cl::init("main"),
+ cl::value_desc("function name"));
-static cl::opt<bool>
-TraceMode("trace", cl::desc("Enable Tracing"));
+ cl::opt<bool> ForceInterpreter("force-interpreter",
+ cl::desc("Force interpretation: disable JIT"),
+ cl::init(false));
-static cl::opt<bool>
-ProfileMode("profile", cl::desc("Enable Profiling [unimp]"));
+ cl::opt<std::string>
+ FakeArgv0("fake-argv0",
+ cl::desc("Override the 'argv[0]' value passed into the executing"
+ " program"), cl::value_desc("executable"));
+}
+static std::vector<std::string> makeStringVector(char * const *envp) {
+ std::vector<std::string> rv;
+ for (unsigned i = 0; envp[i]; ++i)
+ rv.push_back(envp[i]);
+ return rv;
+}
-//===----------------------------------------------------------------------===//
-// Interpreter ctor - Initialize stuff
-//
-Interpreter::Interpreter() : ExitCode(0), Profile(ProfileMode),
- Trace(TraceMode), CurFrame(-1) {
- CurMod = 0;
- loadModule(InputFile);
-
- // Initialize the "backend"
- initializeExecutionEngine();
- initializeExternalMethods();
+static void *CreateArgv(ExecutionEngine *EE,
+ const std::vector<std::string> &InputArgv) {
+ if (EE->getTargetData().getPointerSize() == 8) { // 64 bit target?
+ PointerTy *Result = new PointerTy[InputArgv.size()+1];
+ DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
+
+ for (unsigned i = 0; i < InputArgv.size(); ++i) {
+ unsigned Size = InputArgv[i].size()+1;
+ char *Dest = new char[Size];
+ DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
+
+ std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
+ Dest[Size-1] = 0;
+
+ // Endian safe: Result[i] = (PointerTy)Dest;
+ EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i),
+ Type::LongTy);
+ }
+ Result[InputArgv.size()] = 0;
+ return Result;
+ } else { // 32 bit target?
+ int *Result = new int[InputArgv.size()+1];
+ DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
+
+ for (unsigned i = 0; i < InputArgv.size(); ++i) {
+ unsigned Size = InputArgv[i].size()+1;
+ char *Dest = new char[Size];
+ DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
+
+ std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
+ Dest[Size-1] = 0;
+
+ // Endian safe: Result[i] = (PointerTy)Dest;
+ EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i),
+ Type::IntTy);
+ }
+ Result[InputArgv.size()] = 0; // null terminate it
+ return Result;
+ }
+}
+
+/// callAsMain - Call the function named FnName 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. Returns the result
+/// from calling FnName, or -1 and prints an error msg. if the named
+/// function cannot be found.
+///
+int callAsMain(ExecutionEngine *EE, ModuleProvider *MP,
+ const std::string &FnName,
+ const std::vector<std::string> &Args,
+ const std::vector<std::string> &EnvVars) {
+ Function *Fn = MP->getModule()->getNamedFunction(FnName);
+ if (!Fn) {
+ std::cerr << "Function '" << FnName << "' not found in module.\n";
+ return -1;
+ }
+ std::vector<GenericValue> GVArgs;
+ GenericValue GVArgc;
+ GVArgc.IntVal = Args.size();
+ GVArgs.push_back(GVArgc); // Arg #0 = argc.
+ GVArgs.push_back(PTOGV(CreateArgv(EE, Args))); // Arg #1 = argv.
+ assert(((char **)GVTOP(GVArgs[1]))[0] && "argv[0] was null after CreateArgv");
+ GVArgs.push_back(PTOGV(CreateArgv(EE, EnvVars))); // Arg #2 = envp.
+ return EE->run(Fn, GVArgs).IntVal;
}
//===----------------------------------------------------------------------===//
// main Driver function
//
-int main(int argc, char** argv) {
- cl::ParseCommandLineOptions(argc, argv, " llvm interpreter\n");
-
- // Add the module name to the start of the argv vector...
- //
- InputArgv.insert(InputArgv.begin(), InputFile);
+int main(int argc, char **argv, char * const *envp) {
+ cl::ParseCommandLineOptions(argc, argv,
+ " llvm interpreter & dynamic compiler\n");
+
+ // 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";
+ exit(1);
+ }
- // Create the interpreter...
- Interpreter I;
-
- // 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;
-
- // If running with the profiler, enable it now...
- if (ProfileMode) I.enableProfiling();
- if (TraceMode) I.enableTracing();
-
- // Start interpreter into the main function...
- //
- if (!I.callMainMethod(MainFunction, InputArgv) && !DebugMode) {
- // If not in debug mode and if the call succeeded, run the code now...
- I.run();
+ 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 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();
+ // 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 = callAsMain(EE, MP, MainFunction, InputArgv,
+ makeStringVector(envp));
- // Return the status code of the program executed...
- return I.getExitCode();
+ // Now that we are done executing the program, shut down the execution engine
+ delete EE;
+ return ExitCode;
}
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