2005-04-24 17:36:05 +00:00
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//===- llvm-extract.cpp - LLVM function extraction utility ----------------===//
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2005-04-22 00:00:37 +00:00
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//
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2003-10-20 17:47:21 +00:00
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// The LLVM Compiler Infrastructure
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//
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2007-12-29 20:44:31 +00:00
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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2005-04-22 00:00:37 +00:00
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//
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2003-10-20 17:47:21 +00:00
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//===----------------------------------------------------------------------===//
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2002-05-22 20:27:00 +00:00
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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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2009-07-01 16:58:40 +00:00
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#include "llvm/LLVMContext.h"
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2002-05-22 20:27:00 +00:00
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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2007-05-06 05:13:17 +00:00
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#include "llvm/Bitcode/ReaderWriter.h"
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2002-07-23 22:04:40 +00:00
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#include "llvm/Transforms/IPO.h"
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2003-10-28 22:22:16 +00:00
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#include "llvm/Target/TargetData.h"
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2004-09-01 22:55:40 +00:00
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#include "llvm/Support/CommandLine.h"
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2006-12-06 01:18:01 +00:00
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#include "llvm/Support/ManagedStatic.h"
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2007-05-06 05:13:17 +00:00
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#include "llvm/Support/MemoryBuffer.h"
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2009-03-06 05:34:10 +00:00
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#include "llvm/Support/PrettyStackTrace.h"
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2009-07-15 17:29:42 +00:00
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#include "llvm/Support/raw_ostream.h"
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2004-05-27 05:41:36 +00:00
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#include "llvm/System/Signals.h"
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2002-05-22 20:27:00 +00:00
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#include <memory>
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2003-11-11 22:41:34 +00:00
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using namespace llvm;
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2002-07-22 02:10:13 +00:00
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// InputFilename - The filename to read from.
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2002-07-25 16:31:09 +00:00
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static cl::opt<std::string>
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2007-07-05 17:07:56 +00:00
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InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
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2002-07-22 02:10:13 +00:00
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cl::init("-"), cl::value_desc("filename"));
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2005-04-22 00:00:37 +00:00
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2004-02-18 16:53:59 +00:00
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static cl::opt<std::string>
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2005-04-22 00:00:37 +00:00
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OutputFilename("o", cl::desc("Specify output filename"),
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2004-02-18 16:53:59 +00:00
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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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2002-07-22 02:10:13 +00:00
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2004-04-22 23:07:39 +00:00
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static cl::opt<bool>
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2008-03-07 19:51:57 +00:00
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DeleteFn("delete", cl::desc("Delete specified Globals from Module"));
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2004-04-22 23:07:39 +00:00
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2007-01-28 13:31:35 +00:00
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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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2008-03-07 19:51:57 +00:00
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// ExtractFunc - The function to extract from the module...
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2002-07-25 16:31:09 +00:00
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static cl::opt<std::string>
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2008-03-07 19:51:57 +00:00
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ExtractFunc("func", cl::desc("Specify function to extract"), cl::init(""),
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2002-07-22 02:10:13 +00:00
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cl::value_desc("function"));
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2008-03-07 19:51:57 +00:00
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// ExtractGlobal - The global to extract from the module...
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static cl::opt<std::string>
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ExtractGlobal("glob", cl::desc("Specify global to extract"), cl::init(""),
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cl::value_desc("global"));
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2002-05-22 20:27:00 +00:00
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int main(int argc, char **argv) {
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2009-03-06 05:34:10 +00:00
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// Print a stack trace if we signal out.
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2007-05-06 05:13:17 +00:00
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sys::PrintStackTraceOnErrorSignal();
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2009-03-06 05:34:10 +00:00
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PrettyStackTraceProgram X(argc, argv);
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2009-07-01 16:58:40 +00:00
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2009-07-15 22:16:10 +00:00
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LLVMContext &Context = getGlobalContext();
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2009-03-06 05:34:10 +00:00
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llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
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cl::ParseCommandLineOptions(argc, argv, "llvm extractor\n");
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2002-05-22 20:27:00 +00:00
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2007-05-06 05:13:17 +00:00
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std::auto_ptr<Module> M;
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2007-05-06 23:45:49 +00:00
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MemoryBuffer *Buffer = MemoryBuffer::getFileOrSTDIN(InputFilename);
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2007-05-06 09:29:57 +00:00
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if (Buffer == 0) {
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2009-07-16 15:30:09 +00:00
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errs() << argv[0] << ": Error reading file '" + InputFilename + "'\n";
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2007-05-06 09:29:57 +00:00
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return 1;
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2007-05-06 05:13:17 +00:00
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} else {
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2009-07-01 21:22:36 +00:00
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M.reset(ParseBitcodeFile(Buffer, Context));
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2007-05-06 05:13:17 +00:00
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}
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2007-05-06 09:29:57 +00:00
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delete Buffer;
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2007-05-06 05:13:17 +00:00
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if (M.get() == 0) {
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2009-07-16 15:30:09 +00:00
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errs() << argv[0] << ": bitcode didn't read correctly.\n";
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2007-05-06 05:13:17 +00:00
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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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2009-04-20 16:19:02 +00:00
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GlobalVariable *G = !ExtractGlobal.empty() ?
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2008-03-07 19:51:57 +00:00
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M.get()->getNamedGlobal(ExtractGlobal) : 0;
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// Figure out which function we should extract
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2009-04-20 16:19:02 +00:00
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if (ExtractFunc.empty() && ExtractGlobal.empty()) ExtractFunc = "main";
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2008-03-07 20:07:24 +00:00
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Function *F = M.get()->getFunction(ExtractFunc);
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2008-03-07 19:51:57 +00:00
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if (F == 0 && G == 0) {
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2009-07-16 15:30:09 +00:00
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errs() << argv[0] << ": program doesn't contain function named '"
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<< ExtractFunc << "' or a global named '" << ExtractGlobal << "'!\n";
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2007-05-06 05:13:17 +00:00
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return 1;
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}
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2002-11-19 18:42:59 +00:00
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2007-05-06 05:13:17 +00:00
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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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2008-03-07 19:51:57 +00:00
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std::vector<GlobalValue*> GVs;
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if (F) GVs.push_back(F);
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if (G) GVs.push_back(G);
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Passes.add(createGVExtractionPass(GVs, DeleteFn, Relink));
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2007-05-06 05:13:17 +00:00
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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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2009-08-23 02:56:05 +00:00
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std::string ErrorInfo;
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std::auto_ptr<raw_fd_ostream>
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Out(new raw_fd_ostream(OutputFilename.c_str(), ErrorInfo,
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raw_fd_ostream::F_Binary |
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(Force ? raw_fd_ostream::F_Force : 0)));
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if (!ErrorInfo.empty()) {
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errs() << ErrorInfo << '\n';
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if (!Force)
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errs() << "Use -f command line argument to force output\n";
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return 1;
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2007-05-06 05:13:17 +00:00
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}
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2004-02-18 16:53:59 +00:00
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2009-07-15 17:29:42 +00:00
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Passes.add(createBitcodeWriterPass(*Out));
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2007-05-06 05:13:17 +00:00
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Passes.run(*M.get());
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return 0;
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2002-05-22 20:27:00 +00:00
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}
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