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 interpreter if no JIT is available for this platform.
14 //===----------------------------------------------------------------------===//
16 #include "llvm/LLVMContext.h"
17 #include "llvm/Module.h"
18 #include "llvm/Type.h"
19 #include "llvm/ADT/Triple.h"
20 #include "llvm/Bitcode/ReaderWriter.h"
21 #include "llvm/CodeGen/LinkAllCodegenComponents.h"
22 #include "llvm/ExecutionEngine/GenericValue.h"
23 #include "llvm/ExecutionEngine/Interpreter.h"
24 #include "llvm/ExecutionEngine/JIT.h"
25 #include "llvm/ExecutionEngine/JITEventListener.h"
26 #include "llvm/Support/CommandLine.h"
27 #include "llvm/Support/IRReader.h"
28 #include "llvm/Support/ManagedStatic.h"
29 #include "llvm/Support/MemoryBuffer.h"
30 #include "llvm/Support/PluginLoader.h"
31 #include "llvm/Support/PrettyStackTrace.h"
32 #include "llvm/Support/raw_ostream.h"
33 #include "llvm/System/Process.h"
34 #include "llvm/System/Signals.h"
35 #include "llvm/Target/TargetSelect.h"
39 #include <cygwin/version.h>
40 #if defined(CYGWIN_VERSION_DLL_MAJOR) && CYGWIN_VERSION_DLL_MAJOR<1007
41 #define DO_NOTHING_ATEXIT 1
49 InputFile(cl::desc("<input bitcode>"), cl::Positional, cl::init("-"));
52 InputArgv(cl::ConsumeAfter, cl::desc("<program arguments>..."));
54 cl::opt<bool> ForceInterpreter("force-interpreter",
55 cl::desc("Force interpretation: disable JIT"),
58 cl::opt<bool> UseMCJIT(
59 "use-mcjit", cl::desc("Enable use of the MC-based JIT (if available)"),
62 // Determine optimization level.
65 cl::desc("Optimization level. [-O0, -O1, -O2, or -O3] "
72 TargetTriple("mtriple", cl::desc("Override target triple for module"));
76 cl::desc("Architecture to generate assembly for (see --version)"));
80 cl::desc("Target a specific cpu type (-mcpu=help for details)"),
81 cl::value_desc("cpu-name"),
87 cl::desc("Target specific attributes (-mattr=help for details)"),
88 cl::value_desc("a1,+a2,-a3,..."));
91 EntryFunc("entry-function",
92 cl::desc("Specify the entry function (default = 'main') "
94 cl::value_desc("function"),
98 FakeArgv0("fake-argv0",
99 cl::desc("Override the 'argv[0]' value passed into the executing"
100 " program"), cl::value_desc("executable"));
103 DisableCoreFiles("disable-core-files", cl::Hidden,
104 cl::desc("Disable emission of core files if possible"));
107 NoLazyCompilation("disable-lazy-compilation",
108 cl::desc("Disable JIT lazy compilation"),
112 static ExecutionEngine *EE = 0;
114 static void do_shutdown() {
115 // Cygwin-1.5 invokes DLL's dtors before atexit handler.
116 #ifndef DO_NOTHING_ATEXIT
122 //===----------------------------------------------------------------------===//
123 // main Driver function
125 int main(int argc, char **argv, char * const *envp) {
126 sys::PrintStackTraceOnErrorSignal();
127 PrettyStackTraceProgram X(argc, argv);
129 LLVMContext &Context = getGlobalContext();
130 atexit(do_shutdown); // Call llvm_shutdown() on exit.
132 // If we have a native target, initialize it to ensure it is linked in and
133 // usable by the JIT.
134 InitializeNativeTarget();
136 cl::ParseCommandLineOptions(argc, argv,
137 "llvm interpreter & dynamic compiler\n");
139 // If the user doesn't want core files, disable them.
140 if (DisableCoreFiles)
141 sys::Process::PreventCoreFiles();
143 // Load the bitcode...
145 Module *Mod = ParseIRFile(InputFile, Err, Context);
147 Err.Print(argv[0], errs());
151 // If not jitting lazily, load the whole bitcode file eagerly too.
152 std::string ErrorMsg;
153 if (NoLazyCompilation) {
154 if (Mod->MaterializeAllPermanently(&ErrorMsg)) {
155 errs() << argv[0] << ": bitcode didn't read correctly.\n";
156 errs() << "Reason: " << ErrorMsg << "\n";
161 EngineBuilder builder(Mod);
162 builder.setMArch(MArch);
163 builder.setMCPU(MCPU);
164 builder.setMAttrs(MAttrs);
165 builder.setErrorStr(&ErrorMsg);
166 builder.setEngineKind(ForceInterpreter
167 ? EngineKind::Interpreter
170 // If we are supposed to override the target triple, do so now.
171 if (!TargetTriple.empty())
172 Mod->setTargetTriple(Triple::normalize(TargetTriple));
174 // Enable MCJIT, if desired.
176 builder.setUseMCJIT(true);
178 CodeGenOpt::Level OLvl = CodeGenOpt::Default;
181 errs() << argv[0] << ": invalid optimization level.\n";
184 case '0': OLvl = CodeGenOpt::None; break;
185 case '1': OLvl = CodeGenOpt::Less; break;
186 case '2': OLvl = CodeGenOpt::Default; break;
187 case '3': OLvl = CodeGenOpt::Aggressive; break;
189 builder.setOptLevel(OLvl);
191 EE = builder.create();
193 if (!ErrorMsg.empty())
194 errs() << argv[0] << ": error creating EE: " << ErrorMsg << "\n";
196 errs() << argv[0] << ": unknown error creating EE!\n";
200 EE->RegisterJITEventListener(createOProfileJITEventListener());
202 EE->DisableLazyCompilation(NoLazyCompilation);
204 // If the user specifically requested an argv[0] to pass into the program,
206 if (!FakeArgv0.empty()) {
207 InputFile = FakeArgv0;
209 // Otherwise, if there is a .bc suffix on the executable strip it off, it
210 // might confuse the program.
211 if (StringRef(InputFile).endswith(".bc"))
212 InputFile.erase(InputFile.length() - 3);
215 // Add the module's name to the start of the vector of arguments to main().
216 InputArgv.insert(InputArgv.begin(), InputFile);
218 // Call the main function from M as if its signature were:
219 // int main (int argc, char **argv, const char **envp)
220 // using the contents of Args to determine argc & argv, and the contents of
221 // EnvVars to determine envp.
223 Function *EntryFn = Mod->getFunction(EntryFunc);
225 errs() << '\'' << EntryFunc << "\' function not found in module.\n";
229 // If the program doesn't explicitly call exit, we will need the Exit
230 // function later on to make an explicit call, so get the function now.
231 Constant *Exit = Mod->getOrInsertFunction("exit", Type::getVoidTy(Context),
232 Type::getInt32Ty(Context),
235 // Reset errno to zero on entry to main.
238 // Run static constructors.
239 EE->runStaticConstructorsDestructors(false);
241 if (NoLazyCompilation) {
242 for (Module::iterator I = Mod->begin(), E = Mod->end(); I != E; ++I) {
244 if (Fn != EntryFn && !Fn->isDeclaration())
245 EE->getPointerToFunction(Fn);
250 int Result = EE->runFunctionAsMain(EntryFn, InputArgv, envp);
252 // Run static destructors.
253 EE->runStaticConstructorsDestructors(true);
255 // If the program didn't call exit explicitly, we should call it now.
256 // This ensures that any atexit handlers get called correctly.
257 if (Function *ExitF = dyn_cast<Function>(Exit)) {
258 std::vector<GenericValue> Args;
259 GenericValue ResultGV;
260 ResultGV.IntVal = APInt(32, Result);
261 Args.push_back(ResultGV);
262 EE->runFunction(ExitF, Args);
263 errs() << "ERROR: exit(" << Result << ") returned!\n";
266 errs() << "ERROR: exit defined with wrong prototype!\n";