1 //===----------------------------------------------------------------------===//
4 // Optimizations may be specified an arbitrary number of times on the command
5 // line, they are run in the order specified.
7 //===----------------------------------------------------------------------===//
9 #include "llvm/Module.h"
10 #include "llvm/PassManager.h"
11 #include "llvm/Bytecode/Reader.h"
12 #include "llvm/Bytecode/WriteBytecodePass.h"
13 #include "llvm/Assembly/PrintModulePass.h"
14 #include "llvm/Analysis/Verifier.h"
15 #include "llvm/Transforms/UnifyFunctionExitNodes.h"
16 #include "llvm/Transforms/ConstantMerge.h"
17 #include "llvm/Transforms/CleanupGCCOutput.h"
18 #include "llvm/Transforms/LevelChange.h"
19 #include "llvm/Transforms/FunctionInlining.h"
20 #include "llvm/Transforms/SymbolStripping.h"
21 #include "llvm/Transforms/ChangeAllocations.h"
22 #include "llvm/Transforms/IPO/SimpleStructMutation.h"
23 #include "llvm/Transforms/IPO/GlobalDCE.h"
24 #include "llvm/Transforms/IPO/PoolAllocate.h"
25 #include "llvm/Transforms/Scalar/DCE.h"
26 #include "llvm/Transforms/Scalar/ConstantProp.h"
27 #include "llvm/Transforms/Scalar/GCSE.h"
28 #include "llvm/Transforms/Scalar/IndVarSimplify.h"
29 #include "llvm/Transforms/Scalar/InstructionCombining.h"
30 #include "llvm/Transforms/Scalar/PromoteMemoryToRegister.h"
31 #include "llvm/Transforms/Scalar/DecomposeMultiDimRefs.h"
32 #include "llvm/Transforms/Instrumentation/TraceValues.h"
33 #include "llvm/Transforms/Instrumentation/ProfilePaths.h"
34 #include "Support/CommandLine.h"
35 #include "Support/Signals.h"
39 // Opts enum - All of the transformations we can do...
41 // Basic optimizations
42 dce, die, constprop, gcse, inlining, constmerge, strip, mstrip, mergereturn,
44 // Miscellaneous Transformations
45 raiseallocs, funcresolve, cleangcc, lowerrefs,
47 // Printing and verifying...
48 print, printm, verify,
50 // More powerful optimizations
51 indvars, instcombine, sccp, adce, raise, mem2reg,
56 // Interprocedural optimizations...
57 globaldce, swapstructs, sortstructs, poolalloc,
60 static Pass *createPrintFunctionPass() {
61 return new PrintFunctionPass("Current Function: \n", &cerr);
64 static Pass *createPrintModulePass() {
65 return new PrintModulePass(&cerr);
68 // OptTable - Correlate enum Opts to Pass constructors...
74 { dce , createDeadCodeEliminationPass },
75 { die , createDeadInstEliminationPass },
76 { constprop , createConstantPropogationPass },
77 { gcse , createGCSEPass },
78 { inlining , createFunctionInliningPass },
79 { constmerge , createConstantMergePass },
80 { strip , createSymbolStrippingPass },
81 { mstrip , createFullSymbolStrippingPass },
82 { mergereturn, createUnifyFunctionExitNodesPass },
84 { indvars , createIndVarSimplifyPass },
85 { instcombine, createInstructionCombiningPass },
86 { sccp , createSCCPPass },
87 { adce , createAgressiveDCEPass },
88 { raise , createRaisePointerReferencesPass },
89 { mem2reg , createPromoteMemoryToRegister },
90 { lowerrefs, createDecomposeMultiDimRefsPass },
92 { trace , createTraceValuesPassForBasicBlocks },
93 { tracem , createTraceValuesPassForFunction },
94 { paths , createProfilePathsPass },
96 { print , createPrintFunctionPass },
97 { printm , createPrintModulePass },
98 { verify , createVerifierPass },
100 { raiseallocs, createRaiseAllocationsPass },
101 { cleangcc , createCleanupGCCOutputPass },
102 { funcresolve, createFunctionResolvingPass },
103 { globaldce , createGlobalDCEPass },
104 { swapstructs, createSwapElementsPass },
105 { sortstructs, createSortElementsPass },
106 { poolalloc , createPoolAllocatePass },
110 // Command line option handling code...
112 cl::String InputFilename ("", "Load <arg> file to optimize", cl::NoFlags, "-");
113 cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
114 cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false);
115 cl::Flag PrintEachXForm("p", "Print module after each transformation");
116 cl::Flag Quiet ("q", "Don't print modifying pass names", 0, false);
117 cl::Alias QuietA ("quiet", "Alias for -q", cl::NoFlags, Quiet);
118 cl::EnumList<enum Opts> OptimizationList(cl::NoFlags,
119 clEnumVal(dce , "Dead Code Elimination"),
120 clEnumVal(die , "Dead Instruction Elimination"),
121 clEnumVal(constprop , "Simple constant propogation"),
122 clEnumVal(gcse , "Global Common Subexpression Elimination"),
123 clEnumValN(inlining , "inline", "Function integration"),
124 clEnumVal(constmerge , "Merge identical global constants"),
125 clEnumVal(strip , "Strip symbols"),
126 clEnumVal(mstrip , "Strip module symbols"),
127 clEnumVal(mergereturn, "Unify function exit nodes"),
129 clEnumVal(indvars , "Simplify Induction Variables"),
130 clEnumVal(instcombine, "Combine redundant instructions"),
131 clEnumVal(sccp , "Sparse Conditional Constant Propogation"),
132 clEnumVal(adce , "Agressive DCE"),
133 clEnumVal(mem2reg , "Promote alloca locations to registers"),
135 clEnumVal(globaldce , "Remove unreachable globals"),
136 clEnumVal(swapstructs, "Swap structure types around"),
137 clEnumVal(sortstructs, "Sort structure elements"),
138 clEnumVal(poolalloc , "Pool allocate disjoint datastructures"),
140 clEnumVal(raiseallocs, "Raise allocations from calls to instructions"),
141 clEnumVal(cleangcc , "Cleanup GCC Output"),
142 clEnumVal(funcresolve, "Resolve calls to foo(...) to foo(<concrete types>)"),
143 clEnumVal(raise , "Raise to Higher Level"),
144 clEnumVal(trace , "Insert BB and Function trace code"),
145 clEnumVal(tracem , "Insert Function trace code only"),
146 clEnumVal(paths , "Insert path profiling instrumentation"),
147 clEnumVal(print , "Print working function to stderr"),
148 clEnumVal(printm , "Print working module to stderr"),
149 clEnumVal(verify , "Verify module is well formed"),
150 clEnumVal(lowerrefs , "Decompose multi-dimensional structure/array refs to use one index per instruction"),
155 int main(int argc, char **argv) {
156 cl::ParseCommandLineOptions(argc, argv,
157 " llvm .bc -> .bc modular optimizer\n");
159 // Load the input module...
160 std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
162 cerr << "bytecode didn't read correctly.\n";
166 // Figure out what stream we are supposed to write to...
167 std::ostream *Out = &std::cout; // Default to printing to stdout...
168 if (OutputFilename != "") {
169 if (!Force && std::ifstream(OutputFilename.c_str())) {
170 // If force is not specified, make sure not to overwrite a file!
171 cerr << "Error opening '" << OutputFilename << "': File exists!\n"
172 << "Use -f command line argument to force output\n";
175 Out = new std::ofstream(OutputFilename.c_str());
178 cerr << "Error opening " << OutputFilename << "!\n";
182 // Make sure that the Output file gets unlink'd from the disk if we get a
184 RemoveFileOnSignal(OutputFilename);
187 // Create a PassManager to hold and optimize the collection of passes we are
192 // Create a new optimization pass for each one specified on the command line
193 for (unsigned i = 0; i < OptimizationList.size(); ++i) {
194 enum Opts Opt = OptimizationList[i];
195 for (unsigned j = 0; j < sizeof(OptTable)/sizeof(OptTable[0]); ++j)
196 if (Opt == OptTable[j].OptID) {
197 Passes.add(OptTable[j].PassCtor());
202 Passes.add(new PrintModulePass(&std::cerr));
205 // Check that the module is well formed on completion of optimization
206 Passes.add(createVerifierPass());
208 // Write bytecode out to disk or cout as the last step...
209 Passes.add(new WriteBytecodePass(Out, Out != &std::cout));
211 // Now that we have all of the passes ready, run them.
212 if (Passes.run(M.get()) && !Quiet)
213 cerr << "Program modified.\n";