-//===------------------------------------------------------------------------===
+//===----------------------------------------------------------------------===//
// LLVM 'OPT' UTILITY
//
-// This utility may be invoked in the following manner:
-// opt --help - Output information about command line switches
-// opt [options] -dce - Run a dead code elimination pass on input
-// bytecodes
-// opt [options] -constprop - Run a constant propogation pass on input
-// bytecodes
-// opt [options] -inline - Run a method inlining pass on input bytecodes
-// opt [options] -strip - Strip symbol tables out of methods
-// opt [options] -mstrip - Strip module & method symbol tables
-//
// Optimizations may be specified an arbitrary number of times on the command
// line, they are run in the order specified.
//
-// TODO: Add a -all option to keep applying all optimizations until the program
-// stops permuting.
-//
-//===------------------------------------------------------------------------===
+//===----------------------------------------------------------------------===//
-#include <iostream.h>
-#include <fstream.h>
#include "llvm/Module.h"
+#include "llvm/PassManager.h"
#include "llvm/Bytecode/Reader.h"
-#include "llvm/Bytecode/Writer.h"
-#include "llvm/Tools/CommandLine.h"
-#include "llvm/Opt/AllOpts.h"
+#include "llvm/Bytecode/WriteBytecodePass.h"
+#include "llvm/Assembly/PrintModulePass.h"
+#include "llvm/Analysis/Verifier.h"
+#include "llvm/Transforms/UnifyMethodExitNodes.h"
+#include "llvm/Transforms/ConstantMerge.h"
+#include "llvm/Transforms/CleanupGCCOutput.h"
+#include "llvm/Transforms/LevelChange.h"
+#include "llvm/Transforms/MethodInlining.h"
+#include "llvm/Transforms/SymbolStripping.h"
+#include "llvm/Transforms/ChangeAllocations.h"
+#include "llvm/Transforms/IPO/SimpleStructMutation.h"
+#include "llvm/Transforms/IPO/GlobalDCE.h"
+#include "llvm/Transforms/IPO/PoolAllocate.h"
+#include "llvm/Transforms/Scalar/DCE.h"
+#include "llvm/Transforms/Scalar/ConstantProp.h"
+#include "llvm/Transforms/Scalar/IndVarSimplify.h"
+#include "llvm/Transforms/Scalar/InstructionCombining.h"
+#include "llvm/Transforms/Scalar/PromoteMemoryToRegister.h"
+#include "llvm/Transforms/Scalar/DecomposeMultiDimRefs.h"
+#include "llvm/Transforms/Instrumentation/TraceValues.h"
+#include "llvm/Transforms/Instrumentation/ProfilePaths.h"
+#include "Support/CommandLine.h"
+#include <fstream>
+#include <memory>
+
+// Opts enum - All of the transformations we can do...
+enum Opts {
+ // Basic optimizations
+ dce, die, constprop, inlining, constmerge, strip, mstrip, mergereturn,
+
+ // Miscellaneous Transformations
+ raiseallocs, funcresolve, cleangcc, lowerrefs,
+
+ // Printing and verifying...
+ print, verify,
+
+ // More powerful optimizations
+ indvars, instcombine, sccp, adce, raise, mem2reg,
+
+ // Instrumentation
+ trace, tracem, paths,
+
+ // Interprocedural optimizations...
+ globaldce, swapstructs, sortstructs, poolalloc,
+};
+
+static Pass *createPrintMethodPass() {
+ return new PrintFunctionPass("Current Method: \n", &cerr);
+}
+// OptTable - Correlate enum Opts to Pass constructors...
+//
struct {
- const string ArgName, Name;
- bool (*OptPtr)(Module *C);
+ enum Opts OptID;
+ Pass * (*PassCtor)();
} OptTable[] = {
- { "-dce" , "Dead Code Elimination", DoDeadCodeElimination },
- { "-constprop" , "Constant Propogation", DoConstantPropogation },
- { "-inline" , "Method Inlining", DoMethodInlining },
- { "-strip" , "Strip Symbols", DoSymbolStripping },
- { "-mstrip" , "Strip Module Symbols", DoFullSymbolStripping },
- { "-indvars" , "Simplify Induction Vars",DoInductionVariableCannonicalize },
- { "-sccp" , "Sparse Conditional Constant Prop", DoSCCP<Module> },
- { "-cpm" , "Constant Pool Merging", DoConstantPoolMerging },
+ { dce , createDeadCodeEliminationPass },
+ { die , createDeadInstEliminationPass },
+ { constprop , createConstantPropogationPass },
+ { inlining , createMethodInliningPass },
+ { constmerge , createConstantMergePass },
+ { strip , createSymbolStrippingPass },
+ { mstrip , createFullSymbolStrippingPass },
+ { mergereturn, createUnifyMethodExitNodesPass },
+
+ { indvars , createIndVarSimplifyPass },
+ { instcombine, createInstructionCombiningPass },
+ { sccp , createSCCPPass },
+ { adce , createAgressiveDCEPass },
+ { raise , createRaisePointerReferencesPass },
+ { mem2reg , createPromoteMemoryToRegister },
+ { lowerrefs, createDecomposeMultiDimRefsPass },
+
+ { trace , createTraceValuesPassForBasicBlocks },
+ { tracem , createTraceValuesPassForMethod },
+ { paths , createProfilePathsPass },
+
+ { print , createPrintMethodPass },
+ { verify , createVerifierPass },
+
+ { raiseallocs, createRaiseAllocationsPass },
+ { cleangcc , createCleanupGCCOutputPass },
+ { funcresolve, createFunctionResolvingPass },
+ { globaldce , createGlobalDCEPass },
+ { swapstructs, createSwapElementsPass },
+ { sortstructs, createSortElementsPass },
+ { poolalloc , createPoolAllocatePass },
};
+
+// Command line option handling code...
+//
+cl::String InputFilename ("", "Load <arg> file to optimize", cl::NoFlags, "-");
+cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
+cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false);
+cl::Flag PrintEachXForm("p", "Print module after each transformation");
+cl::Flag Quiet ("q", "Don't print modifying pass names", 0, false);
+cl::Alias QuietA ("quiet", "Alias for -q", cl::NoFlags, Quiet);
+cl::EnumList<enum Opts> OptimizationList(cl::NoFlags,
+ clEnumVal(dce , "Dead Code Elimination"),
+ clEnumVal(die , "Dead Instruction Elimination"),
+ clEnumVal(constprop , "Simple constant propogation"),
+ clEnumValN(inlining , "inline", "Method integration"),
+ clEnumVal(constmerge , "Merge identical global constants"),
+ clEnumVal(strip , "Strip symbols"),
+ clEnumVal(mstrip , "Strip module symbols"),
+ clEnumVal(mergereturn, "Unify method exit nodes"),
+
+ clEnumVal(indvars , "Simplify Induction Variables"),
+ clEnumVal(instcombine, "Combine redundant instructions"),
+ clEnumVal(sccp , "Sparse Conditional Constant Propogation"),
+ clEnumVal(adce , "Agressive DCE"),
+ clEnumVal(mem2reg , "Promote alloca locations to registers"),
+
+ clEnumVal(globaldce , "Remove unreachable globals"),
+ clEnumVal(swapstructs, "Swap structure types around"),
+ clEnumVal(sortstructs, "Sort structure elements"),
+ clEnumVal(poolalloc , "Pool allocate disjoint datastructures"),
+
+ clEnumVal(raiseallocs, "Raise allocations from calls to instructions"),
+ clEnumVal(cleangcc , "Cleanup GCC Output"),
+ clEnumVal(funcresolve, "Resolve calls to foo(...) to foo(<concrete types>)"),
+ clEnumVal(raise , "Raise to Higher Level"),
+ clEnumVal(trace , "Insert BB & Method trace code"),
+ clEnumVal(tracem , "Insert Method trace code only"),
+ clEnumVal(paths , "Insert path profiling instrumentation"),
+ clEnumVal(print , "Print working method to stderr"),
+ clEnumVal(verify , "Verify module is well formed"),
+ clEnumVal(lowerrefs , "Decompose multi-dimensional structure/array refs to use one index per instruction"),
+0);
+
+
+
int main(int argc, char **argv) {
- ToolCommandLine Opts(argc, argv, false);
- bool Quiet = false;
-
- for (int i = 1; i < argc; i++) {
- if (string(argv[i]) == string("--help")) {
- cerr << argv[0] << " usage:\n"
- << " " << argv[0] << " --help - Print this usage information\n";
- for (unsigned j = 0; j < sizeof(OptTable)/sizeof(OptTable[0]); ++j) {
- cerr << "\t" << OptTable[j].ArgName << "\t - Enable "
- << OptTable[j].Name << endl;
- }
- return 1;
- } else if (string(argv[i]) == string("-q")) {
- Quiet = true; argv[i] = 0;
- }
- }
-
- ostream *Out = &cout; // Default to printing to stdout...
+ cl::ParseCommandLineOptions(argc, argv,
+ " llvm .bc -> .bc modular optimizer\n");
- Module *C = ParseBytecodeFile(Opts.getInputFilename());
- if (C == 0) {
+ // Load the input module...
+ std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
+ if (M.get() == 0) {
cerr << "bytecode didn't read correctly.\n";
return 1;
}
-
- for (int i = 1; i < argc; i++) {
- if (argv[i] == 0) continue;
- unsigned j;
- for (j = 0; j < sizeof(OptTable)/sizeof(OptTable[0]); j++) {
- if (string(argv[i]) == OptTable[j].ArgName) {
- if (OptTable[j].OptPtr(C) && !Quiet)
- cerr << OptTable[j].Name << " pass made modifications!\n";
- break;
- }
+ // 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!
+ cerr << "Error opening '" << OutputFilename << "': File exists!\n"
+ << "Use -f command line argument to force output\n";
+ return 1;
}
+ Out = new std::ofstream(OutputFilename.c_str());
- if (j == sizeof(OptTable)/sizeof(OptTable[0]))
- cerr << "'" << argv[i] << "' argument unrecognized: ignored\n";
- }
-
- if (Opts.getOutputFilename() != "-") {
- Out = new ofstream(Opts.getOutputFilename().c_str(),
- (Opts.getForce() ? 0 : ios::noreplace)|ios::out);
if (!Out->good()) {
- cerr << "Error opening " << Opts.getOutputFilename()
- << "!\n";
- delete C;
+ cerr << "Error opening " << OutputFilename << "!\n";
return 1;
}
}
- // Okay, we're done now... write out result...
- WriteBytecodeToFile(C, *Out);
- delete C;
+ // Create a PassManager to hold and optimize the collection of passes we are
+ // about to build...
+ //
+ PassManager Passes;
+
+ // Create a new optimization pass for each one specified on the command line
+ for (unsigned i = 0; i < OptimizationList.size(); ++i) {
+ enum Opts Opt = OptimizationList[i];
+ for (unsigned j = 0; j < sizeof(OptTable)/sizeof(OptTable[0]); ++j)
+ if (Opt == OptTable[j].OptID) {
+ Passes.add(OptTable[j].PassCtor());
+ break;
+ }
+
+ if (PrintEachXForm)
+ Passes.add(new PrintModulePass(&std::cerr));
+ }
+
+ // Check that the module is well formed on completion of optimization
+ Passes.add(createVerifierPass());
+
+ // Write bytecode out to disk or cout as the last step...
+ Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
+
+ // Now that we have all of the passes ready, run them.
+ if (Passes.run(M.get()) && !Quiet)
+ cerr << "Program modified.\n";
- if (Out != &cout) delete Out;
return 0;
}
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