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https://github.com/c64scene-ar/llvm-6502.git
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1e78f36127
args as the objects they represent and the "right thing" will happen git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@283 91177308-0d34-0410-b5e6-96231b3b80d8
119 lines
3.9 KiB
C++
119 lines
3.9 KiB
C++
//===------------------------------------------------------------------------===
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// LLVM 'OPT' UTILITY
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//
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// This utility may be invoked in the following manner:
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// opt --help - Output information about command line switches
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// opt [options] -dce - Run a dead code elimination pass on input
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// bytecodes
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// opt [options] -constprop - Run a constant propogation pass on input
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// bytecodes
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// opt [options] -inline - Run a method inlining pass on input bytecodes
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// opt [options] -strip - Strip symbol tables out of methods
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// opt [options] -mstrip - Strip module & method symbol tables
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//
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// Optimizations may be specified an arbitrary number of times on the command
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// line, they are run in the order specified.
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//
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// TODO: Add a -all option to keep applying all optimizations until the program
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// stops permuting.
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//
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//===------------------------------------------------------------------------===
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#include <iostream.h>
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#include <fstream.h>
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#include "llvm/Module.h"
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#include "llvm/Bytecode/Reader.h"
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#include "llvm/Bytecode/Writer.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Optimizations/AllOpts.h"
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using namespace opt;
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enum Opts {
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// Basic optimizations
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dce, constprop, inlining, strip, mstrip,
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// More powerful optimizations
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indvars, sccp, cpm, adce, raise,
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};
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struct {
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enum Opts OptID;
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bool (*OptPtr)(Module *C);
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} OptTable[] = {
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{ dce , DoDeadCodeElimination },
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{ constprop, DoConstantPropogation },
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{ inlining , DoMethodInlining },
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{ strip , DoSymbolStripping },
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{ mstrip , DoFullSymbolStripping },
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{ indvars , DoInductionVariableCannonicalize },
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{ sccp , DoSCCP },
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{ cpm , DoConstantPoolMerging },
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{ adce , DoADCE },
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{ raise , DoRaiseRepresentation },
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};
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cl::String InputFilename ("", "Load <arg> file to optimize", 0, "-");
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cl::String OutputFilename("o", "Override output filename", 0, "");
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cl::Flag Force ("f", "Overwrite output files", 0, false);
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cl::Flag Quiet ("q", "Don't print modifying pass names", 0, false);
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cl::EnumList<enum Opts> OptimizationList(cl::NoFlags,
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clEnumVal(dce , "Dead Code Elimination"),
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clEnumVal(constprop, "Simple Constant Propogation"),
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clEnumValN(inlining , "inline", "Method Inlining"),
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clEnumVal(strip , "Strip Symbols"),
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clEnumVal(mstrip , "Strip Module Symbols"),
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clEnumVal(indvars , "Simplify Induction Variables"),
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clEnumVal(sccp , "Sparse Conditional Constant Propogation"),
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clEnumVal(cpm , "Constant Pool Merging"),
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clEnumVal(adce , "Agressive DCE"),
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clEnumVal(raise , "Raise to Higher Level"),
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0);
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int main(int argc, char **argv) {
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cl::ParseCommandLineOptions(argc, argv,
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" llvm .bc -> .bc modular optimizer\n");
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Module *C = ParseBytecodeFile(InputFilename);
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if (C == 0) {
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cerr << "bytecode didn't read correctly.\n";
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return 1;
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}
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for (unsigned i = 0; i < OptimizationList.size(); ++i) {
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enum Opts Opt = OptimizationList[i];
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unsigned j;
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for (j = 0; j < sizeof(OptTable)/sizeof(OptTable[0]); ++j) {
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if (Opt == OptTable[j].OptID) {
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if (OptTable[j].OptPtr(C) && !Quiet)
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cerr << OptimizationList.getArgName(Opt)
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<< " pass made modifications!\n";
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break;
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}
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}
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if (j == sizeof(OptTable)/sizeof(OptTable[0]))
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cerr << "Optimization tables inconsistent!!\n";
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}
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ostream *Out = &cout; // Default to printing to stdout...
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if (OutputFilename != "") {
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Out = new ofstream(OutputFilename.c_str(),
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(Force ? 0 : ios::noreplace)|ios::out);
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if (!Out->good()) {
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cerr << "Error opening " << OutputFilename << "!\n";
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delete C;
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return 1;
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}
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}
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// Okay, we're done now... write out result...
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WriteBytecodeToFile(C, *Out);
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delete C;
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if (Out != &cout) delete Out;
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return 0;
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}
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