//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
+//
+// The LLVM Compiler Infrastructure
//
-// 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.
+// 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 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 "ExecutionEngine.h"
-#include "Support/CommandLine.h"
-#include "llvm/Bytecode/Reader.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"
+
+using namespace llvm;
namespace {
cl::opt<std::string>
cl::list<std::string>
InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
+ cl::opt<bool> ForceInterpreter("force-interpreter",
+ cl::desc("Force interpretation: disable JIT"),
+ cl::init(false));
+
cl::opt<std::string>
- MainFunction ("f", cl::desc("Function to execute"), cl::init("main"),
- cl::value_desc("function name"));
+ FakeArgv0("fake-argv0",
+ cl::desc("Override the 'argv[0]' value passed into the executing"
+ " program"), cl::value_desc("executable"));
+}
- cl::opt<bool> TraceMode("trace", cl::desc("Enable Tracing"));
+static void *CreateArgv(ExecutionEngine *EE,
+ const std::vector<std::string> &InputArgv) {
+ unsigned PtrSize = EE->getTargetData().getPointerSize();
+ char *Result = new char[(InputArgv.size()+1)*PtrSize];
- cl::opt<bool> ForceInterpreter("force-interpreter",
- cl::desc("Force interpretation: disable JIT"),
- cl::init(false));
+ DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
+ const Type *SBytePtr = PointerType::get(Type::SByteTy);
+
+ 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*PtrSize),
+ SBytePtr);
+ }
+
+ // Null terminate it
+ EE->StoreValueToMemory(PTOGV(0),
+ (GenericValue*)(Result+InputArgv.size()*PtrSize),
+ SBytePtr);
+ return Result;
}
//===----------------------------------------------------------------------===//
// main Driver function
//
-int main(int argc, char** argv, const char ** envp) {
+int main(int argc, char **argv, char * const *envp) {
cl::ParseCommandLineOptions(argc, argv,
- " llvm interpreter & dynamic compiler\n");
+ " llvm interpreter & dynamic compiler\n");
// Load the bytecode...
std::string ErrorMsg;
- Module *M = ParseBytecodeFile(InputFile, &ErrorMsg);
- if (M == 0) {
- std::cout << "Error parsing '" << InputFile << "': "
- << ErrorMsg << "\n";
+ ModuleProvider *MP = 0;
+ try {
+ MP = getBytecodeModuleProvider(InputFile);
+ } catch (std::string &err) {
+ std::cerr << "Error loading program '" << InputFile << "': " << err << "\n";
exit(1);
}
ExecutionEngine *EE =
- ExecutionEngine::create (M, ForceInterpreter, TraceMode);
- assert (EE && "Couldn't create an ExecutionEngine, not even an interpreter?");
+ ExecutionEngine::create(MP, ForceInterpreter);
+ assert(EE && "Couldn't create an ExecutionEngine, not even an interpreter?");
- // Add the module's name to the start of the vector of arguments to main().
- // But delete .bc first, since programs (and users) might not expect to
- // see it.
- const std::string ByteCodeFileSuffix (".bc");
- if (InputFile.rfind (ByteCodeFileSuffix) ==
- InputFile.length () - ByteCodeFileSuffix.length ()) {
- InputFile.erase (InputFile.length () - ByteCodeFileSuffix.length ());
+ // 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);
- // Run the main function!
- int ExitCode = EE->run(MainFunction, InputArgv, envp);
+ // 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;
+ }
+
+ std::vector<GenericValue> GVArgs;
+ GenericValue GVArgc;
+ GVArgc.IntVal = InputArgv.size();
+ GVArgs.push_back(GVArgc); // Arg #0 = argc.
+ GVArgs.push_back(PTOGV(CreateArgv(EE, InputArgv))); // Arg #1 = argv.
+ assert(((char **)GVTOP(GVArgs[1]))[0] && "argv[0] was null after CreateArgv");
+
+ std::vector<std::string> EnvVars;
+ for (unsigned i = 0; envp[i]; ++i)
+ EnvVars.push_back(envp[i]);
+ GVArgs.push_back(PTOGV(CreateArgv(EE, EnvVars))); // Arg #2 = envp.
+ GenericValue Result = EE->runFunction(Fn, GVArgs);
+
+ // 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, 0);
+
+ GVArgs.clear();
+ GVArgs.push_back(Result);
+ EE->runFunction(Exit, GVArgs);
- // Now that we are done executing the program, shut down the execution engine
- delete EE;
- return ExitCode;
+ std::cerr << "ERROR: exit(" << Result.IntVal << ") returned!\n";
+ abort();
}
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