1 //===- lli.cpp - LLVM Interpreter / Dynamic compiler ----------------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // 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/Bitcode/ReaderWriter.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/ManagedStatic.h"
26 #include "llvm/Support/MemoryBuffer.h"
27 #include "llvm/Support/PluginLoader.h"
28 #include "llvm/System/Process.h"
29 #include "llvm/System/Signals.h"
36 InputFile(cl::desc("<input bitcode>"), cl::Positional, cl::init("-"));
39 InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
41 cl::opt<bool> ForceInterpreter("force-interpreter",
42 cl::desc("Force interpretation: disable JIT"),
45 TargetTriple("mtriple", cl::desc("Override target triple for module"));
48 FakeArgv0("fake-argv0",
49 cl::desc("Override the 'argv[0]' value passed into the executing"
50 " program"), cl::value_desc("executable"));
53 DisableCoreFiles("disable-core-files", cl::Hidden,
54 cl::desc("Disable emission of core files if possible"));
57 NoLazyCompilation("disable-lazy-compilation",
58 cl::desc("Disable JIT lazy compilation"),
62 static ExecutionEngine *EE = 0;
64 static void do_shutdown() {
69 //===----------------------------------------------------------------------===//
70 // main Driver function
72 int main(int argc, char **argv, char * const *envp) {
73 atexit(do_shutdown); // Call llvm_shutdown() on exit.
74 cl::ParseCommandLineOptions(argc, argv,
75 "llvm interpreter & dynamic compiler\n");
76 sys::PrintStackTraceOnErrorSignal();
78 // If the user doesn't want core files, disable them.
80 sys::Process::PreventCoreFiles();
82 // Load the bitcode...
84 ModuleProvider *MP = NULL;
85 if (MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFile,&ErrorMsg)) {
86 MP = getBitcodeModuleProvider(Buffer, &ErrorMsg);
87 if (!MP) delete Buffer;
91 std::cerr << argv[0] << ": error loading program '" << InputFile << "': "
96 // Get the module as the MP could go away once EE takes over.
97 Module *Mod = NoLazyCompilation
98 ? MP->materializeModule(&ErrorMsg) : MP->getModule();
100 std::cerr << argv[0] << ": bitcode didn't read correctly.\n";
101 std::cerr << "Reason: " << ErrorMsg << "\n";
105 // If we are supposed to override the target triple, do so now.
106 if (!TargetTriple.empty())
107 Mod->setTargetTriple(TargetTriple);
109 EE = ExecutionEngine::create(MP, ForceInterpreter, &ErrorMsg);
110 if (!EE && !ErrorMsg.empty()) {
111 std::cerr << argv[0] << ":error creating EE: " << ErrorMsg << "\n";
115 if (NoLazyCompilation)
116 EE->DisableLazyCompilation();
118 // If the user specifically requested an argv[0] to pass into the program,
120 if (!FakeArgv0.empty()) {
121 InputFile = FakeArgv0;
123 // Otherwise, if there is a .bc suffix on the executable strip it off, it
124 // might confuse the program.
125 if (InputFile.rfind(".bc") == InputFile.length() - 3)
126 InputFile.erase(InputFile.length() - 3);
129 // Add the module's name to the start of the vector of arguments to main().
130 InputArgv.insert(InputArgv.begin(), InputFile);
132 // Call the main function from M as if its signature were:
133 // int main (int argc, char **argv, const char **envp)
134 // using the contents of Args to determine argc & argv, and the contents of
135 // EnvVars to determine envp.
137 Function *MainFn = Mod->getFunction("main");
139 std::cerr << "'main' function not found in module.\n";
143 // If the program doesn't explicitly call exit, we will need the Exit
144 // function later on to make an explicit call, so get the function now.
145 Constant *Exit = Mod->getOrInsertFunction("exit", Type::VoidTy,
146 Type::Int32Ty, NULL);
148 // Reset errno to zero on entry to main.
151 // Run static constructors.
152 EE->runStaticConstructorsDestructors(false);
154 if (NoLazyCompilation) {
155 for (Module::iterator I = Mod->begin(), E = Mod->end(); I != E; ++I) {
157 if (Fn != MainFn && !Fn->isDeclaration())
158 EE->getPointerToFunction(Fn);
163 int Result = EE->runFunctionAsMain(MainFn, InputArgv, envp);
165 // Run static destructors.
166 EE->runStaticConstructorsDestructors(true);
168 // If the program didn't call exit explicitly, we should call it now.
169 // This ensures that any atexit handlers get called correctly.
170 if (Function *ExitF = dyn_cast<Function>(Exit)) {
171 std::vector<GenericValue> Args;
172 GenericValue ResultGV;
173 ResultGV.IntVal = APInt(32, Result);
174 Args.push_back(ResultGV);
175 EE->runFunction(ExitF, Args);
176 std::cerr << "ERROR: exit(" << Result << ") returned!\n";
179 std::cerr << "ERROR: exit defined with wrong prototype!\n";