//===- opt.cpp - The LLVM Modular Optimizer -------------------------------===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// Optimizations may be specified an arbitrary number of times on the command
-// line, they are run in the order specified.
+// line, They are run in the order specified.
//
//===----------------------------------------------------------------------===//
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Analysis/Verifier.h"
+#include "llvm/Analysis/LoopPass.h"
+#include "llvm/Target/TargetData.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Target/TargetMachineImpls.h"
#include "llvm/Support/PassNameParser.h"
#include "llvm/System/Signals.h"
-#include "Support/SystemUtils.h"
+#include "llvm/Support/ManagedStatic.h"
+#include "llvm/Support/PluginLoader.h"
+#include "llvm/Support/Streams.h"
+#include "llvm/Support/SystemUtils.h"
+#include "llvm/Support/Timer.h"
+#include "llvm/LinkAllPasses.h"
+#include "llvm/LinkAllVMCore.h"
+#include <iostream>
#include <fstream>
#include <memory>
#include <algorithm>
-
using namespace llvm;
// The OptimizationList is automatically populated with registered Passes by the
// PassNameParser.
//
-static cl::list<const PassInfo*, bool,
- FilteredPassNameParser<PassInfo::Optimization> >
-OptimizationList(cl::desc("Optimizations available:"));
+static cl::list<const PassInfo*, bool, PassNameParser>
+PassList(cl::desc("Optimizations available:"));
+static cl::opt<bool> NoCompress("disable-compression", cl::init(true),
+ cl::desc("Don't compress the generated bytecode"));
// Other command line options...
//
static cl::opt<std::string>
-InputFilename(cl::Positional, cl::desc("<input bytecode>"), cl::init("-"));
+InputFilename(cl::Positional, cl::desc("<input bytecode file>"),
+ cl::init("-"), cl::value_desc("filename"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Override output filename"),
NoVerify("disable-verify", cl::desc("Do not verify result module"), cl::Hidden);
static cl::opt<bool>
-Quiet("q", cl::desc("Don't print 'program modified' message"));
+VerifyEach("verify-each", cl::desc("Verify after each transform"));
+
+static cl::opt<bool>
+StripDebug("strip-debug",
+ cl::desc("Strip debugger symbol info from translation unit"));
+
+static cl::opt<bool>
+DisableInline("disable-inlining", cl::desc("Do not run the inliner pass"));
+
+static cl::opt<bool>
+DisableOptimizations("disable-opt",
+ cl::desc("Do not run any optimization passes"));
+
+static cl::opt<bool>
+StandardCompileOpts("std-compile-opts",
+ cl::desc("Include the standard compile time optimizations"));
+
+static cl::opt<bool>
+Quiet("q", cl::desc("Obsolete option"), cl::Hidden);
+
+static cl::alias
+QuietA("quiet", cl::desc("Alias for -q"), cl::aliasopt(Quiet));
+
+static cl::opt<bool>
+AnalyzeOnly("analyze", cl::desc("Only perform analysis, no optimization"));
+
+static Timer BytecodeLoadTimer("Bytecode Loader");
+
+// ---------- Define Printers for module and function passes ------------
+namespace {
+
+struct ModulePassPrinter : public ModulePass {
+ const PassInfo *PassToPrint;
+ ModulePassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
+
+ virtual bool runOnModule(Module &M) {
+ if (!Quiet) {
+ cout << "Printing analysis '" << PassToPrint->getPassName() << "':\n";
+ getAnalysisID<Pass>(PassToPrint).print(cout, &M);
+ }
+
+ // Get and print pass...
+ return false;
+ }
+
+ virtual const char *getPassName() const { return "'Pass' Printer"; }
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequiredID(PassToPrint);
+ AU.setPreservesAll();
+ }
+};
+
+struct FunctionPassPrinter : public FunctionPass {
+ const PassInfo *PassToPrint;
+ FunctionPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
+
+ virtual bool runOnFunction(Function &F) {
+ if (!Quiet) {
+ cout << "Printing analysis '" << PassToPrint->getPassName()
+ << "' for function '" << F.getName() << "':\n";
+ }
+ // Get and print pass...
+ getAnalysisID<Pass>(PassToPrint).print(cout, F.getParent());
+ return false;
+ }
+
+ virtual const char *getPassName() const { return "FunctionPass Printer"; }
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequiredID(PassToPrint);
+ AU.setPreservesAll();
+ }
+};
+
+struct BasicBlockPassPrinter : public BasicBlockPass {
+ const PassInfo *PassToPrint;
+ BasicBlockPassPrinter(const PassInfo *PI) : PassToPrint(PI) {}
+
+ virtual bool runOnBasicBlock(BasicBlock &BB) {
+ if (!Quiet) {
+ cout << "Printing Analysis info for BasicBlock '" << BB.getName()
+ << "': Pass " << PassToPrint->getPassName() << ":\n";
+ }
+
+ // Get and print pass...
+ getAnalysisID<Pass>(PassToPrint).print(cout, BB.getParent()->getParent());
+ return false;
+ }
+
+ virtual const char *getPassName() const { return "BasicBlockPass Printer"; }
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.addRequiredID(PassToPrint);
+ AU.setPreservesAll();
+ }
+};
+
+inline void addPass(PassManager &PM, Pass *P) {
+ // Add the pass to the pass manager...
+ PM.add(P);
+
+ // If we are verifying all of the intermediate steps, add the verifier...
+ if (VerifyEach) PM.add(createVerifierPass());
+}
+
+void AddStandardCompilePasses(PassManager &PM) {
+ PM.add(createVerifierPass()); // Verify that input is correct
+
+ addPass(PM, createLowerSetJmpPass()); // Lower llvm.setjmp/.longjmp
+
+ // If the -strip-debug command line option was specified, do it.
+ if (StripDebug)
+ addPass(PM, createStripSymbolsPass(true));
+
+ if (DisableOptimizations) return;
+
+ addPass(PM, createRaiseAllocationsPass()); // call %malloc -> malloc inst
+ addPass(PM, createCFGSimplificationPass()); // Clean up disgusting code
+ addPass(PM, createPromoteMemoryToRegisterPass());// Kill useless allocas
+ addPass(PM, createGlobalOptimizerPass()); // Optimize out global vars
+ addPass(PM, createGlobalDCEPass()); // Remove unused fns and globs
+ addPass(PM, createIPConstantPropagationPass());// IP Constant Propagation
+ addPass(PM, createDeadArgEliminationPass()); // Dead argument elimination
+ addPass(PM, createInstructionCombiningPass()); // Clean up after IPCP & DAE
+ addPass(PM, createCFGSimplificationPass()); // Clean up after IPCP & DAE
+
+ addPass(PM, createPruneEHPass()); // Remove dead EH info
+
+ if (!DisableInline)
+ addPass(PM, createFunctionInliningPass()); // Inline small functions
+ addPass(PM, createArgumentPromotionPass()); // Scalarize uninlined fn args
+
+ addPass(PM, createTailDuplicationPass()); // Simplify cfg by copying code
+ addPass(PM, createInstructionCombiningPass()); // Cleanup for scalarrepl.
+ addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
+ addPass(PM, createScalarReplAggregatesPass()); // Break up aggregate allocas
+ addPass(PM, createInstructionCombiningPass()); // Combine silly seq's
+ addPass(PM, createCondPropagationPass()); // Propagate conditionals
+
+ addPass(PM, createTailCallEliminationPass()); // Eliminate tail calls
+ addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
+ addPass(PM, createReassociatePass()); // Reassociate expressions
+ addPass(PM, createLoopRotatePass());
+ addPass(PM, createLICMPass()); // Hoist loop invariants
+ addPass(PM, createLoopUnswitchPass()); // Unswitch loops.
+ addPass(PM, createInstructionCombiningPass()); // Clean up after LICM/reassoc
+ addPass(PM, createIndVarSimplifyPass()); // Canonicalize indvars
+ addPass(PM, createLoopUnrollPass()); // Unroll small loops
+ addPass(PM, createInstructionCombiningPass()); // Clean up after the unroller
+ addPass(PM, createLoadValueNumberingPass()); // GVN for load instructions
+ addPass(PM, createGCSEPass()); // Remove common subexprs
+ addPass(PM, createSCCPPass()); // Constant prop with SCCP
+
+ // Run instcombine after redundancy elimination to exploit opportunities
+ // opened up by them.
+ addPass(PM, createInstructionCombiningPass());
+ addPass(PM, createCondPropagationPass()); // Propagate conditionals
+
+ addPass(PM, createDeadStoreEliminationPass()); // Delete dead stores
+ addPass(PM, createAggressiveDCEPass()); // SSA based 'Aggressive DCE'
+ addPass(PM, createCFGSimplificationPass()); // Merge & remove BBs
+ addPass(PM, createSimplifyLibCallsPass()); // Library Call Optimizations
+ addPass(PM, createDeadTypeEliminationPass()); // Eliminate dead types
+ addPass(PM, createConstantMergePass()); // Merge dup global constants
+}
+
+} // anonymous namespace
//===----------------------------------------------------------------------===//
// main for opt
//
int main(int argc, char **argv) {
- cl::ParseCommandLineOptions(argc, argv,
- " llvm .bc -> .bc modular optimizer\n");
- PrintStackTraceOnErrorSignal();
-
- // Allocate a full target machine description only if necessary...
- // FIXME: The choice of target should be controllable on the command line.
- std::auto_ptr<TargetMachine> target;
-
- TargetMachine* TM = NULL;
- std::string ErrorMessage;
-
- // Load the input module...
- std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename, &ErrorMessage));
- if (M.get() == 0) {
- std::cerr << argv[0] << ": ";
- if (ErrorMessage.size())
- std::cerr << ErrorMessage << "\n";
- else
- std::cerr << "bytecode didn't read correctly.\n";
- return 1;
- }
+ llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
+ try {
+ cl::ParseCommandLineOptions(argc, argv,
+ " llvm .bc -> .bc modular optimizer and analysis printer \n");
+ sys::PrintStackTraceOnErrorSignal();
+
+ // Allocate a full target machine description only if necessary.
+ // FIXME: The choice of target should be controllable on the command line.
+ std::auto_ptr<TargetMachine> target;
+
+ std::string ErrorMessage;
- // Figure out what stream we are supposed to write to...
- std::ostream *Out = &std::cout; // Default to printing to stdout...
- if (OutputFilename != "-") {
- if (!Force && std::ifstream(OutputFilename.c_str())) {
- // If force is not specified, make sure not to overwrite a file!
- std::cerr << argv[0] << ": error opening '" << OutputFilename
- << "': file exists!\n"
- << "Use -f command line argument to force output\n";
+ // Load the input module...
+ std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename,
+ Compressor::decompressToNewBuffer, &ErrorMessage));
+ if (M.get() == 0) {
+ cerr << argv[0] << ": ";
+ if (ErrorMessage.size())
+ cerr << ErrorMessage << "\n";
+ else
+ cerr << "bytecode didn't read correctly.\n";
return 1;
}
- Out = new std::ofstream(OutputFilename.c_str());
- if (!Out->good()) {
- std::cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
- return 1;
+ // Figure out what stream we are supposed to write to...
+ // FIXME: cout is not binary!
+ std::ostream *Out = &std::cout; // Default to printing to stdout...
+ if (OutputFilename != "-") {
+ if (!Force && std::ifstream(OutputFilename.c_str())) {
+ // If force is not specified, make sure not to overwrite a file!
+ cerr << argv[0] << ": error opening '" << OutputFilename
+ << "': file exists!\n"
+ << "Use -f command line argument to force output\n";
+ return 1;
+ }
+ std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
+ std::ios::binary;
+ Out = new std::ofstream(OutputFilename.c_str(), io_mode);
+
+ if (!Out->good()) {
+ cerr << argv[0] << ": error opening " << OutputFilename << "!\n";
+ return 1;
+ }
+
+ // Make sure that the Output file gets unlinked from the disk if we get a
+ // SIGINT
+ sys::RemoveFileOnSignal(sys::Path(OutputFilename));
}
- // Make sure that the Output file gets unlinked from the disk if we get a
- // SIGINT
- RemoveFileOnSignal(OutputFilename);
- }
+ // If the output is set to be emitted to standard out, and standard out is a
+ // console, print out a warning message and refuse to do it. We don't
+ // impress anyone by spewing tons of binary goo to a terminal.
+ if (!Force && !NoOutput && CheckBytecodeOutputToConsole(Out,!Quiet)) {
+ NoOutput = true;
+ }
- // If the output is set to be emitted to standard out, and standard out is a
- // console, print out a warning message and refuse to do it. We don't impress
- // anyone by spewing tons of binary goo to a terminal.
- if (Out == &std::cout && isStandardOutAConsole() && !Force && !NoOutput) {
- std::cerr << "WARNING: It looks like you're attempting to print out a "
- << "bytecode file. I'm\ngoing to pretend you didn't ask me to do"
- << " this (for your own good). If you\nREALLY want to taste LLVM"
- << " bytecode first hand, you can force output with the\n'-f'"
- << " option.\n\n";
- NoOutput = true;
- }
+ // Create a PassManager to hold and optimize the collection of passes we are
+ // about to build...
+ //
+ PassManager Passes;
- // Create a PassManager to hold and optimize the collection of passes we are
- // about to build...
- //
- PassManager Passes;
-
- // Add an appropriate TargetData instance for this module...
- Passes.add(new TargetData("opt", M.get()));
-
- // Create a new optimization pass for each one specified on the command line
- for (unsigned i = 0; i < OptimizationList.size(); ++i) {
- const PassInfo *Opt = OptimizationList[i];
-
- if (Opt->getNormalCtor())
- Passes.add(Opt->getNormalCtor()());
- else if (Opt->getTargetCtor()) {
-#if 0
- if (target.get() == NULL)
- target.reset(allocateSparcTargetMachine()); // FIXME: target option
-#endif
- assert(target.get() && "Could not allocate target machine!");
- Passes.add(Opt->getTargetCtor()(*target.get()));
- } else
- std::cerr << argv[0] << ": cannot create pass: " << Opt->getPassName()
- << "\n";
-
- if (PrintEachXForm)
- Passes.add(new PrintModulePass(&std::cerr));
- }
+ // Add an appropriate TargetData instance for this module...
+ Passes.add(new TargetData(M.get()));
- // Check that the module is well formed on completion of optimization
- if (!NoVerify)
- Passes.add(createVerifierPass());
+ // If -std-compile-opts is given, add in all the standard compilation
+ // optimizations first. This will handle -strip-debug, -disable-inline,
+ // and -disable-opt as well.
+ if (StandardCompileOpts)
+ AddStandardCompilePasses(Passes);
- // Write bytecode out to disk or cout as the last step...
- if (!NoOutput)
- Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
+ // otherwise if the -strip-debug command line option was specified, add it.
+ else if (StripDebug)
+ addPass(Passes, createStripSymbolsPass(true));
+
+ // Create a new optimization pass for each one specified on the command line
+ for (unsigned i = 0; i < PassList.size(); ++i) {
+ const PassInfo *PassInf = PassList[i];
+ Pass *P = 0;
+ if (PassInf->getNormalCtor())
+ P = PassInf->getNormalCtor()();
+ else
+ cerr << argv[0] << ": cannot create pass: "
+ << PassInf->getPassName() << "\n";
+ if (P) {
+ addPass(Passes, P);
+
+ if (AnalyzeOnly) {
+ if (dynamic_cast<BasicBlockPass*>(P))
+ Passes.add(new BasicBlockPassPrinter(PassInf));
+ else if (dynamic_cast<FunctionPass*>(P))
+ Passes.add(new FunctionPassPrinter(PassInf));
+ else
+ Passes.add(new ModulePassPrinter(PassInf));
+ }
+ }
+
+ if (PrintEachXForm)
+ Passes.add(new PrintModulePass(&cerr));
+ }
+
+ // Check that the module is well formed on completion of optimization
+ if (!NoVerify && !VerifyEach)
+ Passes.add(createVerifierPass());
+
+ // Write bytecode out to disk or cout as the last step...
+ OStream L(*Out);
+ if (!NoOutput && !AnalyzeOnly)
+ Passes.add(new WriteBytecodePass(&L, false, !NoCompress));
+
+ // Now that we have all of the passes ready, run them.
+ Passes.run(*M.get());
- // Now that we have all of the passes ready, run them.
- if (Passes.run(*M.get()))
return 0;
+ } catch (const std::string& msg) {
+ cerr << argv[0] << ": " << msg << "\n";
+ } catch (...) {
+ cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
+ }
+ llvm_shutdown();
return 1;
}
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