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118 lines
3.9 KiB
C++
118 lines
3.9 KiB
C++
//===- llvm-extract.cpp - LLVM function extraction utility ----------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This utility changes the input module to only contain a single function,
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// which is primarily used for debugging transformations.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Bitcode/ReaderWriter.h"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/MemoryBuffer.h"
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#include "llvm/System/Signals.h"
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#include <iostream>
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#include <memory>
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#include <fstream>
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using namespace llvm;
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// InputFilename - The filename to read from.
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static cl::opt<std::string>
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InputFilename(cl::Positional, cl::desc("<input bytecode file>"),
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cl::init("-"), cl::value_desc("filename"));
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static cl::opt<std::string>
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OutputFilename("o", cl::desc("Specify output filename"),
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cl::value_desc("filename"), cl::init("-"));
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static cl::opt<bool>
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Force("f", cl::desc("Overwrite output files"));
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static cl::opt<bool>
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DeleteFn("delete", cl::desc("Delete specified function from Module"));
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static cl::opt<bool>
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Relink("relink",
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cl::desc("Turn external linkage for callees of function to delete"));
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// ExtractFunc - The function to extract from the module... defaults to main.
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static cl::opt<std::string>
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ExtractFunc("func", cl::desc("Specify function to extract"), cl::init("main"),
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cl::value_desc("function"));
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int main(int argc, char **argv) {
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llvm_shutdown_obj X; // Call llvm_shutdown() on exit.
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cl::ParseCommandLineOptions(argc, argv, " llvm extractor\n");
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sys::PrintStackTraceOnErrorSignal();
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std::auto_ptr<Module> M;
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MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename);
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if (Buffer == 0) {
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cerr << "Error reading file '" + InputFilename + "'";
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return 1;
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} else {
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M.reset(ParseBitcodeFile(Buffer));
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}
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delete Buffer;
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if (M.get() == 0) {
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cerr << argv[0] << ": bytecode didn't read correctly.\n";
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return 1;
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}
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// Figure out which function we should extract
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Function *F = M.get()->getFunction(ExtractFunc);
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if (F == 0) {
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cerr << argv[0] << ": program doesn't contain function named '"
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<< ExtractFunc << "'!\n";
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return 1;
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}
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// In addition to deleting all other functions, we also want to spiff it
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// up a little bit. Do this now.
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PassManager Passes;
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Passes.add(new TargetData(M.get())); // Use correct TargetData
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// Either isolate the function or delete it from the Module
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Passes.add(createFunctionExtractionPass(F, DeleteFn, Relink));
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if (!DeleteFn)
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Passes.add(createGlobalDCEPass()); // Delete unreachable globals
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Passes.add(createDeadTypeEliminationPass()); // Remove dead types...
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Passes.add(createStripDeadPrototypesPass()); // Remove dead func decls
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std::ostream *Out = 0;
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if (OutputFilename != "-") { // Not stdout?
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if (!Force && std::ifstream(OutputFilename.c_str())) {
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// If force is not specified, make sure not to overwrite a file!
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cerr << argv[0] << ": error opening '" << OutputFilename
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<< "': file exists!\n"
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<< "Use -f command line argument to force output\n";
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return 1;
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}
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std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
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std::ios::binary;
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Out = new std::ofstream(OutputFilename.c_str(), io_mode);
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} else { // Specified stdout
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// FIXME: cout is not binary!
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Out = &std::cout;
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}
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Passes.add(CreateBitcodeWriterPass(*Out));
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Passes.run(*M.get());
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if (Out != &std::cout)
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delete Out;
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return 0;
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}
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