1 //===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file was developed by the LLVM research group and is distributed under
6 // the University of Illinois Open Source License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 // This utility provides a simple wrapper around the LLVM Execution Engines,
11 // which allow the direct execution of LLVM programs through a Just-In-Time
12 // compiler, or through an intepreter if no JIT is available for this platform.
14 //===----------------------------------------------------------------------===//
16 #include "llvm/Module.h"
17 #include "llvm/ModuleProvider.h"
18 #include "llvm/Type.h"
19 #include "llvm/Bytecode/Reader.h"
20 #include "llvm/Codegen/LinkAllCodegenComponents.h"
21 #include "llvm/ExecutionEngine/JIT.h"
22 #include "llvm/ExecutionEngine/Interpreter.h"
23 #include "llvm/ExecutionEngine/GenericValue.h"
24 #include "llvm/Support/CommandLine.h"
25 #include "llvm/Support/PluginLoader.h"
26 #include "llvm/System/Signals.h"
33 InputFile(cl::desc("<input bytecode>"), cl::Positional, cl::init("-"));
36 InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
38 cl::opt<bool> ForceInterpreter("force-interpreter",
39 cl::desc("Force interpretation: disable JIT"),
42 TargetTriple("mtriple", cl::desc("Override target triple for module"));
45 FakeArgv0("fake-argv0",
46 cl::desc("Override the 'argv[0]' value passed into the executing"
47 " program"), cl::value_desc("executable"));
50 //===----------------------------------------------------------------------===//
51 // main Driver function
53 int main(int argc, char **argv, char * const *envp) {
55 cl::ParseCommandLineOptions(argc, argv,
56 " llvm interpreter & dynamic compiler\n");
57 sys::PrintStackTraceOnErrorSignal();
59 // Load the bytecode...
61 ModuleProvider *MP = 0;
63 MP = getBytecodeModuleProvider(InputFile);
64 } catch (std::string &err) {
65 std::cerr << "Error loading program '" << InputFile << "': "
70 // If we are supposed to override the target triple, do so now.
71 if (!TargetTriple.empty())
72 MP->getModule()->setTargetTriple(TargetTriple);
74 ExecutionEngine *EE = ExecutionEngine::create(MP, ForceInterpreter);
75 assert(EE &&"Couldn't create an ExecutionEngine, not even an interpreter?");
77 // If the user specifically requested an argv[0] to pass into the program,
79 if (!FakeArgv0.empty()) {
80 InputFile = FakeArgv0;
82 // Otherwise, if there is a .bc suffix on the executable strip it off, it
83 // might confuse the program.
84 if (InputFile.rfind(".bc") == InputFile.length() - 3)
85 InputFile.erase(InputFile.length() - 3);
88 // Add the module's name to the start of the vector of arguments to main().
89 InputArgv.insert(InputArgv.begin(), InputFile);
91 // Call the main function from M as if its signature were:
92 // int main (int argc, char **argv, const char **envp)
93 // using the contents of Args to determine argc & argv, and the contents of
94 // EnvVars to determine envp.
96 Function *Fn = MP->getModule()->getMainFunction();
98 std::cerr << "'main' function not found in module.\n";
102 // Run static constructors.
103 EE->runStaticConstructorsDestructors(false);
106 int Result = EE->runFunctionAsMain(Fn, InputArgv, envp);
108 // Run static destructors.
109 EE->runStaticConstructorsDestructors(true);
111 // If the program didn't explicitly call exit, call exit now, for the
112 // program. This ensures that any atexit handlers get called correctly.
113 Function *Exit = MP->getModule()->getOrInsertFunction("exit", Type::VoidTy,
117 std::vector<GenericValue> Args;
118 GenericValue ResultGV;
119 ResultGV.IntVal = Result;
120 Args.push_back(ResultGV);
121 EE->runFunction(Exit, Args);
123 std::cerr << "ERROR: exit(" << Result << ") returned!\n";
125 } catch (const std::string& msg) {
126 std::cerr << argv[0] << ": " << msg << "\n";
128 std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";