forked from OSchip/llvm-project
139 lines
4.5 KiB
C++
139 lines
4.5 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 is distributed under the University of Illinois Open Source
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// 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/LLVMContext.h"
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#include "llvm/Module.h"
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#include "llvm/PassManager.h"
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#include "llvm/Assembly/PrintModulePass.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/IRReader.h"
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#include "llvm/Support/ManagedStatic.h"
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#include "llvm/Support/PrettyStackTrace.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Support/SystemUtils.h"
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#include "llvm/System/Signals.h"
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#include <memory>
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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 bitcode 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("Enable binary output on terminals"));
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static cl::opt<bool>
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DeleteFn("delete", cl::desc("Delete specified Globals 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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// ExtractFuncs - The functions to extract from the module...
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static cl::list<std::string>
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ExtractFuncs("func", cl::desc("Specify function to extract"),
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cl::ZeroOrMore, cl::value_desc("function"));
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// ExtractGlobals - The globals to extract from the module...
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static cl::list<std::string>
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ExtractGlobals("glob", cl::desc("Specify global to extract"),
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cl::ZeroOrMore, cl::value_desc("global"));
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static cl::opt<bool>
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OutputAssembly("S",
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cl::desc("Write output as LLVM assembly"), cl::Hidden);
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int main(int argc, char **argv) {
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// Print a stack trace if we signal out.
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sys::PrintStackTraceOnErrorSignal();
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PrettyStackTraceProgram X(argc, argv);
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LLVMContext &Context = getGlobalContext();
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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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SMDiagnostic Err;
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std::auto_ptr<Module> M;
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M.reset(ParseIRFile(InputFilename, Err, Context));
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if (M.get() == 0) {
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Err.Print(argv[0], errs());
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return 1;
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}
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std::vector<GlobalValue *> GVs;
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// Figure out which globals we should extract.
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for (size_t i = 0, e = ExtractGlobals.size(); i != e; ++i) {
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GlobalValue *GV = M.get()->getNamedGlobal(ExtractGlobals[i]);
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if (!GV) {
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errs() << argv[0] << ": program doesn't contain global named '"
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<< ExtractGlobals[i] << "'!\n";
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return 1;
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}
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GVs.push_back(GV);
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}
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// Figure out which functions we should extract.
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for (size_t i = 0, e = ExtractFuncs.size(); i != e; ++i) {
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GlobalValue *GV = M.get()->getFunction(ExtractFuncs[i]);
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if (!GV) {
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errs() << argv[0] << ": program doesn't contain function named '"
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<< ExtractFuncs[i] << "'!\n";
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return 1;
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}
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GVs.push_back(GV);
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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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Passes.add(createGVExtractionPass(GVs, 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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// Make sure that the Output file gets unlinked from the disk if we get a
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// SIGINT
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sys::RemoveFileOnSignal(sys::Path(OutputFilename));
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std::string ErrorInfo;
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raw_fd_ostream Out(OutputFilename.c_str(), ErrorInfo,
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raw_fd_ostream::F_Binary);
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if (!ErrorInfo.empty()) {
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errs() << ErrorInfo << '\n';
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return 1;
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}
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if (OutputAssembly)
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Passes.add(createPrintModulePass(&Out));
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else if (Force || !CheckBitcodeOutputToConsole(Out, true))
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Passes.add(createBitcodeWriterPass(Out));
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Passes.run(*M.get());
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return 0;
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}
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