1 //===- opt.cpp - The LLVM Modular Optimizer -------------------------------===//
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 // Optimizations may be specified an arbitrary number of times on the command
11 // line, They are run in the order specified.
13 //===----------------------------------------------------------------------===//
15 #include "llvm/Module.h"
16 #include "llvm/PassManager.h"
17 #include "llvm/Bytecode/Reader.h"
18 #include "llvm/Bytecode/WriteBytecodePass.h"
19 #include "llvm/Bitcode/ReaderWriter.h"
20 #include "llvm/Assembly/PrintModulePass.h"
21 #include "llvm/Analysis/Verifier.h"
22 #include "llvm/Analysis/LoopPass.h"
23 #include "llvm/Target/TargetData.h"
24 #include "llvm/Target/TargetMachine.h"
25 #include "llvm/Support/PassNameParser.h"
26 #include "llvm/System/Signals.h"
27 #include "llvm/Support/ManagedStatic.h"
28 #include "llvm/Support/MemoryBuffer.h"
29 #include "llvm/Support/PluginLoader.h"
30 #include "llvm/Support/Streams.h"
31 #include "llvm/Support/SystemUtils.h"
32 #include "llvm/LinkAllPasses.h"
33 #include "llvm/LinkAllVMCore.h"
40 static cl::opt<bool> Bitcode("bitcode");
42 // The OptimizationList is automatically populated with registered Passes by the
45 static cl::list<const PassInfo*, bool, PassNameParser>
46 PassList(cl::desc("Optimizations available:"));
48 static cl::opt<bool> NoCompress("disable-compression", cl::init(true),
49 cl::desc("Don't compress the generated bytecode"));
51 // Other command line options...
53 static cl::opt<std::string>
54 InputFilename(cl::Positional, cl::desc("<input bytecode file>"),
55 cl::init("-"), cl::value_desc("filename"));
57 static cl::opt<std::string>
58 OutputFilename("o", cl::desc("Override output filename"),
59 cl::value_desc("filename"), cl::init("-"));
62 Force("f", cl::desc("Overwrite output files"));
65 PrintEachXForm("p", cl::desc("Print module after each transformation"));
68 NoOutput("disable-output",
69 cl::desc("Do not write result bytecode file"), cl::Hidden);
72 NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
75 VerifyEach("verify-each", cl::desc("Verify after each transform"));
78 StripDebug("strip-debug",
79 cl::desc("Strip debugger symbol info from translation unit"));
82 DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
85 DisableOptimizations("disable-opt",
86 cl::desc("Do not run any optimization passes"));
89 StandardCompileOpts("std-compile-opts",
90 cl::desc("Include the standard compile time optimizations"));
93 Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
96 QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
99 AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
101 // ---------- Define Printers for module and function passes ------------
104 struct ModulePassPrinter : public ModulePass {
106 const PassInfo *PassToPrint;
107 ModulePassPrinter(const PassInfo *PI) : ModulePass((intptr_t)&ID),
110 virtual bool runOnModule(Module &M) {
112 cout << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
113 getAnalysisID<Pass>(PassToPrint).print(cout, &M);
116 // Get and print pass...
120 virtual const char *getPassName() const { return "'Pass' Printer"; }
122 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
123 AU.addRequiredID(PassToPrint);
124 AU.setPreservesAll();
128 char ModulePassPrinter::ID = 0;
129 struct FunctionPassPrinter : public FunctionPass {
130 const PassInfo *PassToPrint;
132 FunctionPassPrinter(const PassInfo *PI) : FunctionPass((intptr_t)&ID),
135 virtual bool runOnFunction(Function &F) {
137 cout << "Printing analysis '" << PassToPrint->getPassName()
138 << "' for function '" << F.getName() << "':\n";
140 // Get and print pass...
141 getAnalysisID<Pass>(PassToPrint).print(cout, F.getParent());
145 virtual const char *getPassName() const { return "FunctionPass Printer"; }
147 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
148 AU.addRequiredID(PassToPrint);
149 AU.setPreservesAll();
153 char FunctionPassPrinter::ID = 0;
154 struct BasicBlockPassPrinter : public BasicBlockPass {
155 const PassInfo *PassToPrint;
157 BasicBlockPassPrinter(const PassInfo *PI)
158 : BasicBlockPass((intptr_t)&ID), PassToPrint(PI) {}
160 virtual bool runOnBasicBlock(BasicBlock &BB) {
162 cout << "Printing Analysis info for BasicBlock '" << BB.getName()
163 << "': Pass " << PassToPrint->getPassName() << ":\n";
166 // Get and print pass...
167 getAnalysisID<Pass>(PassToPrint).print(cout, BB.getParent()->getParent());
171 virtual const char *getPassName() const { return "BasicBlockPass Printer"; }
173 virtual void getAnalysisUsage(AnalysisUsage &AU) const {
174 AU.addRequiredID(PassToPrint);
175 AU.setPreservesAll();
179 char BasicBlockPassPrinter::ID = 0;
180 inline void addPass(PassManager &PM, Pass *P) {
181 // Add the pass to the pass manager...
184 // If we are verifying all of the intermediate steps, add the verifier...
185 if (VerifyEach) PM.add(createVerifierPass());
188 void AddStandardCompilePasses(PassManager &PM) {
189 PM.add(createVerifierPass()); // Verify that input is correct
191 addPass(PM, createLowerSetJmpPass()); // Lower llvm.setjmp/.longjmp
193 // If the -strip-debug command line option was specified, do it.
195 addPass(PM, createStripSymbolsPass(true));
197 if (DisableOptimizations) return;
199 addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
200 addPass(PM, createCFGSimplificationPass()); // Clean up disgusting code
201 addPass(PM, createPromoteMemoryToRegisterPass());// Kill useless allocas
202 addPass(PM, createGlobalOptimizerPass()); // Optimize out global vars
203 addPass(PM, createGlobalDCEPass()); // Remove unused fns and globs
204 addPass(PM, createIPConstantPropagationPass());// IP Constant Propagation
205 addPass(PM, createDeadArgEliminationPass()); // Dead argument elimination
206 addPass(PM, createInstructionCombiningPass()); // Clean up after IPCP & DAE
207 addPass(PM, createCFGSimplificationPass()); // Clean up after IPCP & DAE
209 addPass(PM, createPruneEHPass()); // Remove dead EH info
212 addPass(PM, createFunctionInliningPass()); // Inline small functions
213 addPass(PM, createArgumentPromotionPass()); // Scalarize uninlined fn args
215 addPass(PM, createTailDuplicationPass()); // Simplify cfg by copying code
216 addPass(PM, createInstructionCombiningPass()); // Cleanup for scalarrepl.
217 addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
218 addPass(PM, createScalarReplAggregatesPass()); // Break up aggregate allocas
219 addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
220 addPass(PM, createCondPropagationPass()); // Propagate conditionals
222 addPass(PM, createTailCallEliminationPass()); // Eliminate tail calls
223 addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
224 addPass(PM, createReassociatePass()); // Reassociate expressions
225 addPass(PM, createLoopRotatePass());
226 addPass(PM, createLICMPass()); // Hoist loop invariants
227 addPass(PM, createLoopUnswitchPass()); // Unswitch loops.
228 addPass(PM, createInstructionCombiningPass()); // Clean up after LICM/reassoc
229 addPass(PM, createIndVarSimplifyPass()); // Canonicalize indvars
230 addPass(PM, createLoopUnrollPass()); // Unroll small loops
231 addPass(PM, createInstructionCombiningPass()); // Clean up after the unroller
232 addPass(PM, createLoadValueNumberingPass()); // GVN for load instructions
233 addPass(PM, createGCSEPass()); // Remove common subexprs
234 addPass(PM, createSCCPPass()); // Constant prop with SCCP
236 // Run instcombine after redundancy elimination to exploit opportunities
237 // opened up by them.
238 addPass(PM, createInstructionCombiningPass());
239 addPass(PM, createCondPropagationPass()); // Propagate conditionals
241 addPass(PM, createDeadStoreEliminationPass()); // Delete dead stores
242 addPass(PM, createAggressiveDCEPass()); // SSA based 'Aggressive DCE'
243 addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
244 addPass(PM, createSimplifyLibCallsPass()); // Library Call Optimizations
245 addPass(PM, createDeadTypeEliminationPass()); // Eliminate dead types
246 addPass(PM, createConstantMergePass()); // Merge dup global constants
249 } // anonymous namespace
252 //===----------------------------------------------------------------------===//
255 int main(int argc, char **argv) {
256 llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
258 cl::ParseCommandLineOptions(argc, argv,
259 " llvm .bc -> .bc modular optimizer and analysis printer \n");
260 sys::PrintStackTraceOnErrorSignal();
262 // Allocate a full target machine description only if necessary.
263 // FIXME: The choice of target should be controllable on the command line.
264 std::auto_ptr<TargetMachine> target;
266 std::string ErrorMessage;
268 // Load the input module...
269 std::auto_ptr<Module> M;
271 MemoryBuffer *Buffer;
272 if (InputFilename == "-") {
273 Buffer = MemoryBuffer::getSTDIN();
275 Buffer = MemoryBuffer::getFile(&InputFilename[0], InputFilename.size());
279 ErrorMessage = "Error reading file '" + InputFilename + "'";
281 M.reset(ParseBitcodeFile(Buffer, &ErrorMessage));
285 M.reset(ParseBytecodeFile(InputFilename,
286 Compressor::decompressToNewBuffer,
290 cerr << argv[0] << ": ";
291 if (ErrorMessage.size())
292 cerr << ErrorMessage << "\n";
294 cerr << "bytecode didn't read correctly.\n";
298 // Figure out what stream we are supposed to write to...
299 // FIXME: cout is not binary!
300 std::ostream *Out = &std::cout; // Default to printing to stdout...
301 if (OutputFilename != "-") {
302 if (!Force && std::ifstream(OutputFilename.c_str())) {
303 // If force is not specified, make sure not to overwrite a file!
304 cerr << argv[0] << ": error opening '" << OutputFilename
305 << "': file exists!\n"
306 << "Use -f command line argument to force output\n";
309 std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
311 Out = new std::ofstream(OutputFilename.c_str(), io_mode);
314 cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
318 // Make sure that the Output file gets unlinked from the disk if we get a
320 sys::RemoveFileOnSignal(sys::Path(OutputFilename));
323 // If the output is set to be emitted to standard out, and standard out is a
324 // console, print out a warning message and refuse to do it. We don't
325 // impress anyone by spewing tons of binary goo to a terminal.
326 if (!Force && !NoOutput && CheckBytecodeOutputToConsole(Out,!Quiet)) {
330 // Create a PassManager to hold and optimize the collection of passes we are
335 // Add an appropriate TargetData instance for this module...
336 Passes.add(new TargetData(M.get()));
338 // If -std-compile-opts is given, add in all the standard compilation
339 // optimizations first. This will handle -strip-debug, -disable-inline,
340 // and -disable-opt as well.
341 if (StandardCompileOpts)
342 AddStandardCompilePasses(Passes);
344 // otherwise if the -strip-debug command line option was specified, add it.
346 addPass(Passes, createStripSymbolsPass(true));
348 // Create a new optimization pass for each one specified on the command line
349 for (unsigned i = 0; i < PassList.size(); ++i) {
350 const PassInfo *PassInf = PassList[i];
352 if (PassInf->getNormalCtor())
353 P = PassInf->getNormalCtor()();
355 cerr << argv[0] << ": cannot create pass: "
356 << PassInf->getPassName() << "\n";
361 if (dynamic_cast<BasicBlockPass*>(P))
362 Passes.add(new BasicBlockPassPrinter(PassInf));
363 else if (dynamic_cast<FunctionPass*>(P))
364 Passes.add(new FunctionPassPrinter(PassInf));
366 Passes.add(new ModulePassPrinter(PassInf));
371 Passes.add(new PrintModulePass(&cerr));
374 // Check that the module is well formed on completion of optimization
375 if (!NoVerify && !VerifyEach)
376 Passes.add(createVerifierPass());
378 // Write bytecode out to disk or cout as the last step...
380 if (!NoOutput && !AnalyzeOnly) {
382 Passes.add(CreateBitcodeWriterPass(*Out));
384 Passes.add(new WriteBytecodePass(&L, false, !NoCompress));
387 // Now that we have all of the passes ready, run them.
388 Passes.run(*M.get());
392 } catch (const std::string& msg) {
393 cerr << argv[0] << ": " << msg << "\n";
395 cerr << argv[0] << ": Unexpected unknown exception occurred.\n";