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", 0, "-");
57 cl::String OutputFilename("o", "Override output filename", 0, "");
58 cl::Flag Force ("f", "Overwrite output files", 0, false);
59 cl::Flag Quiet ("q", "Don't print modifying pass names", 0, false);
60 cl::EnumList<enum Opts> OptimizationList(cl::NoFlags,
61 clEnumVal(dce , "Dead Code Elimination"),
62 clEnumVal(constprop, "Simple Constant Propogation"),
63 clEnumValN(inlining , "inline", "Method Inlining"),
64 clEnumVal(strip , "Strip Symbols"),
65 clEnumVal(mstrip , "Strip Module Symbols"),
66 clEnumVal(indvars , "Simplify Induction Variables"),
67 clEnumVal(sccp , "Sparse Conditional Constant Propogation"),
68 clEnumVal(cpm , "Constant Pool Merging"),
69 clEnumVal(adce , "Agressive DCE"),
70 clEnumVal(raise , "Raise to Higher Level"),
74 int main(int argc, char **argv) {
75 cl::ParseCommandLineOptions(argc, argv,
76 " llvm .bc -> .bc modular optimizer\n");
78 Module *C = ParseBytecodeFile(InputFilename.getValue());
80 cerr << "bytecode didn't read correctly.\n";
84 for (unsigned i = 0; i < OptimizationList.size(); ++i) {
85 enum Opts Opt = OptimizationList[i];
88 for (j = 0; j < sizeof(OptTable)/sizeof(OptTable[0]); ++j) {
89 if (Opt == OptTable[j].OptID) {
90 if (OptTable[j].OptPtr(C) && !Quiet)
91 cerr << OptimizationList.getArgName(Opt)
92 << " pass made modifications!\n";
97 if (j == sizeof(OptTable)/sizeof(OptTable[0]))
98 cerr << "Optimization tables inconsistent!!\n";
101 ostream *Out = &cout; // Default to printing to stdout...
102 if (OutputFilename.getValue() != "") {
103 Out = new ofstream(OutputFilename.getValue().c_str(),
104 (Force.getValue() ? 0 : ios::noreplace)|ios::out);
106 cerr << "Error opening " << OutputFilename.getValue() << "!\n";
112 // Okay, we're done now... write out result...
113 WriteBytecodeToFile(C, *Out);
116 if (Out != &cout) delete Out;