1 //===------------------------------------------------------------------------===
4 // This utility may be invoked in the following manner:
5 // opt --help - Output information about command line switches
6 // opt [options] -dce - Run a dead code elimination pass on input
8 // opt [options] -constprop - Run a constant propogation pass on input
10 // opt [options] -inline - Run a method inlining pass on input bytecodes
11 // opt [options] -strip - Strip symbol tables out of methods
12 // opt [options] -mstrip - Strip module & method symbol tables
14 // Optimizations may be specified an arbitrary number of times on the command
15 // line, they are run in the order specified.
17 // TODO: Add a -all option to keep applying all optimizations until the program
20 //===------------------------------------------------------------------------===
24 #include "llvm/Module.h"
25 #include "llvm/Bytecode/Reader.h"
26 #include "llvm/Bytecode/Writer.h"
27 #include "llvm/Support/CommandLine.h"
28 #include "llvm/Optimizations/AllOpts.h"
33 // Basic optimizations
34 dce, constprop, inlining, strip, mstrip,
36 // More powerful optimizations
37 indvars, sccp, cpm, adce, raise,
42 bool (*OptPtr)(Module *C);
44 { dce , DoDeadCodeElimination },
45 { constprop, DoConstantPropogation },
46 { inlining , DoMethodInlining },
47 { strip , DoSymbolStripping },
48 { mstrip , DoFullSymbolStripping },
49 { indvars , DoInductionVariableCannonicalize },
51 { cpm , DoConstantPoolMerging },
53 { raise , DoRaiseRepresentation },
56 cl::String InputFilename ("", "Load <arg> file to optimize", cl::NoFlags, "-");
57 cl::String OutputFilename("o", "Override output filename", cl::NoFlags, "");
58 cl::Flag Force ("f", "Overwrite output files", cl::NoFlags, false);
59 cl::Flag Quiet ("q", "Don't print modifying pass names", 0, false);
60 cl::Alias QuietA ("quiet", "Alias for -q", cl::NoFlags, Quiet);
61 cl::EnumList<enum Opts> OptimizationList(cl::NoFlags,
62 clEnumVal(dce , "Dead Code Elimination"),
63 clEnumVal(constprop, "Simple Constant Propogation"),
64 clEnumValN(inlining , "inline", "Method Integration"),
65 clEnumVal(strip , "Strip Symbols"),
66 clEnumVal(mstrip , "Strip Module Symbols"),
67 clEnumVal(indvars , "Simplify Induction Variables"),
68 clEnumVal(sccp , "Sparse Conditional Constant Propogation"),
69 clEnumVal(cpm , "Constant Pool Merging"),
70 clEnumVal(adce , "Agressive DCE"),
71 clEnumVal(raise , "Raise to Higher Level"),
75 int main(int argc, char **argv) {
76 cl::ParseCommandLineOptions(argc, argv,
77 " llvm .bc -> .bc modular optimizer\n");
79 Module *C = ParseBytecodeFile(InputFilename);
81 cerr << "bytecode didn't read correctly.\n";
85 for (unsigned i = 0; i < OptimizationList.size(); ++i) {
86 enum Opts Opt = OptimizationList[i];
89 for (j = 0; j < sizeof(OptTable)/sizeof(OptTable[0]); ++j) {
90 if (Opt == OptTable[j].OptID) {
91 if (OptTable[j].OptPtr(C) && !Quiet)
92 cerr << OptimizationList.getArgName(Opt)
93 << " pass made modifications!\n";
98 if (j == sizeof(OptTable)/sizeof(OptTable[0]))
99 cerr << "Optimization tables inconsistent!!\n";
102 ostream *Out = &cout; // Default to printing to stdout...
103 if (OutputFilename != "") {
104 Out = new ofstream(OutputFilename.c_str(),
105 (Force ? 0 : ios::noreplace)|ios::out);
107 cerr << "Error opening " << OutputFilename << "!\n";
113 // Okay, we're done now... write out result...
114 WriteBytecodeToFile(C, *Out);
117 if (Out != &cout) delete Out;