2002-12-23 23:59:41 +00:00
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//===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
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2003-10-20 17:47:21 +00:00
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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2001-08-23 17:05:04 +00:00
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//
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2002-12-23 23:59:41 +00:00
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// This utility provides a way to execute LLVM bytecode without static
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// compilation. This consists of a very simple and slow (but portable)
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// interpreter, along with capability for system specific dynamic compilers. At
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// runtime, the fastest (stable) execution engine is selected to run the
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// program. This means the JIT compiler for the current platform if it's
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// available.
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2001-08-23 17:05:04 +00:00
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//
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//===----------------------------------------------------------------------===//
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2003-09-05 20:08:15 +00:00
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#include "llvm/DerivedTypes.h"
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#include "llvm/Module.h"
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2003-10-14 21:39:53 +00:00
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#include "llvm/ModuleProvider.h"
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2003-09-05 20:08:15 +00:00
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#include "llvm/Bytecode/Reader.h"
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2003-09-05 19:42:34 +00:00
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#include "llvm/ExecutionEngine/ExecutionEngine.h"
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#include "llvm/ExecutionEngine/GenericValue.h"
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2002-12-23 23:59:41 +00:00
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#include "llvm/Target/TargetMachineImpls.h"
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2003-09-05 18:42:01 +00:00
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#include "llvm/Target/TargetData.h"
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2003-09-05 20:08:15 +00:00
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#include "Support/CommandLine.h"
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#include "Support/Debug.h"
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2003-10-14 21:39:53 +00:00
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#include "Support/SystemUtils.h"
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2001-08-23 17:05:04 +00:00
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2003-11-11 22:41:34 +00:00
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using namespace llvm;
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2002-12-23 23:59:41 +00:00
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namespace {
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cl::opt<std::string>
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InputFile(cl::desc("<input bytecode>"), cl::Positional, cl::init("-"));
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2002-07-22 02:10:13 +00:00
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2002-12-23 23:59:41 +00:00
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cl::list<std::string>
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InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
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2002-07-22 02:10:13 +00:00
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2002-12-23 23:59:41 +00:00
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cl::opt<std::string>
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2003-09-25 18:10:34 +00:00
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MainFunction("f", cl::desc("Function to execute"), cl::init("main"),
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cl::value_desc("function name"));
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2002-07-22 02:10:13 +00:00
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2002-12-23 23:59:41 +00:00
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cl::opt<bool> ForceInterpreter("force-interpreter",
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cl::desc("Force interpretation: disable JIT"),
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cl::init(false));
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2003-10-28 22:51:44 +00:00
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cl::opt<std::string>
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FakeArgv0("fake-argv0",
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cl::desc("Override the 'argv[0]' value passed into the executing"
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" program"), cl::value_desc("executable"));
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2002-12-23 23:59:41 +00:00
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}
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2001-10-27 08:43:52 +00:00
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2003-10-14 21:39:53 +00:00
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static std::vector<std::string> makeStringVector(char * const *envp) {
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2003-09-05 18:42:01 +00:00
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std::vector<std::string> rv;
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for (unsigned i = 0; envp[i]; ++i)
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rv.push_back(envp[i]);
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2003-09-05 18:42:01 +00:00
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return rv;
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}
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static void *CreateArgv(ExecutionEngine *EE,
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const std::vector<std::string> &InputArgv) {
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if (EE->getTargetData().getPointerSize() == 8) { // 64 bit target?
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PointerTy *Result = new PointerTy[InputArgv.size()+1];
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DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
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for (unsigned i = 0; i < InputArgv.size(); ++i) {
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unsigned Size = InputArgv[i].size()+1;
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char *Dest = new char[Size];
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DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
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std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
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Dest[Size-1] = 0;
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// Endian safe: Result[i] = (PointerTy)Dest;
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EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i),
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Type::LongTy);
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2003-09-05 18:42:01 +00:00
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}
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Result[InputArgv.size()] = 0;
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return Result;
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} else { // 32 bit target?
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int *Result = new int[InputArgv.size()+1];
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DEBUG(std::cerr << "ARGV = " << (void*)Result << "\n");
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for (unsigned i = 0; i < InputArgv.size(); ++i) {
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unsigned Size = InputArgv[i].size()+1;
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char *Dest = new char[Size];
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DEBUG(std::cerr << "ARGV[" << i << "] = " << (void*)Dest << "\n");
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std::copy(InputArgv[i].begin(), InputArgv[i].end(), Dest);
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Dest[Size-1] = 0;
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// Endian safe: Result[i] = (PointerTy)Dest;
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EE->StoreValueToMemory(PTOGV(Dest), (GenericValue*)(Result+i),
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Type::IntTy);
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2003-09-05 18:42:01 +00:00
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}
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Result[InputArgv.size()] = 0; // null terminate it
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return Result;
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}
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}
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/// callAsMain - Call the function named FnName from M as if its
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/// signature were int main (int argc, char **argv, const char
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/// **envp), using the contents of Args to determine argc & argv, and
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/// the contents of EnvVars to determine envp. Returns the result
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/// from calling FnName, or -1 and prints an error msg. if the named
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/// function cannot be found.
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///
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int callAsMain(ExecutionEngine *EE, ModuleProvider *MP,
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const std::string &FnName,
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const std::vector<std::string> &Args,
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const std::vector<std::string> &EnvVars) {
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Function *Fn = MP->getModule()->getNamedFunction(FnName);
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if (!Fn) {
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std::cerr << "Function '" << FnName << "' not found in module.\n";
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return -1;
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}
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std::vector<GenericValue> GVArgs;
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GenericValue GVArgc;
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2003-09-25 18:10:34 +00:00
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GVArgc.IntVal = Args.size();
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GVArgs.push_back(GVArgc); // Arg #0 = argc.
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GVArgs.push_back(PTOGV(CreateArgv(EE, Args))); // Arg #1 = argv.
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GVArgs.push_back(PTOGV(CreateArgv(EE, EnvVars))); // Arg #2 = envp.
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return EE->run(Fn, GVArgs).IntVal;
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2003-09-05 18:42:01 +00:00
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}
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2001-08-23 17:05:04 +00:00
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//===----------------------------------------------------------------------===//
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// main Driver function
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//
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2003-10-14 21:39:53 +00:00
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int main(int argc, char **argv, char * const *envp) {
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cl::ParseCommandLineOptions(argc, argv,
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" llvm interpreter & dynamic compiler\n");
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2002-12-23 23:59:41 +00:00
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// Load the bytecode...
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2002-12-24 00:39:16 +00:00
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std::string ErrorMsg;
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ModuleProvider *MP = 0;
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try {
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MP = getBytecodeModuleProvider(InputFile);
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} catch (std::string &err) {
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std::cerr << "Error parsing '" << InputFile << "': " << err << "\n";
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2002-12-23 23:59:41 +00:00
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exit(1);
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}
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2003-09-03 20:34:19 +00:00
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ExecutionEngine *EE =
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2003-10-24 20:00:17 +00:00
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ExecutionEngine::create(MP, ForceInterpreter);
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assert(EE && "Couldn't create an ExecutionEngine, not even an interpreter?");
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2001-08-23 17:05:04 +00:00
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2003-10-28 22:51:44 +00:00
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// If the user specifically requested an argv[0] to pass into the program, do
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// it now.
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if (!FakeArgv0.empty()) {
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InputFile = FakeArgv0;
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} else {
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// Otherwise, if there is a .bc suffix on the executable strip it off, it
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// might confuse the program.
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if (InputFile.rfind(".bc") == InputFile.length() - 3)
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InputFile.erase(InputFile.length() - 3);
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2003-05-23 20:28:07 +00:00
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}
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2003-10-28 22:51:44 +00:00
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// Add the module's name to the start of the vector of arguments to main().
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2002-07-22 02:10:13 +00:00
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InputArgv.insert(InputArgv.begin(), InputFile);
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2002-12-23 23:59:41 +00:00
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// Run the main function!
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int ExitCode = callAsMain(EE, MP, MainFunction, InputArgv,
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makeStringVector(envp));
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2001-08-23 17:05:04 +00:00
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2002-12-23 23:59:41 +00:00
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// Now that we are done executing the program, shut down the execution engine
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delete EE;
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return ExitCode;
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2001-08-23 17:05:04 +00:00
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}
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