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//===- llvm-extract.cpp - LLVM function extraction utility ----------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This utility changes the input module to only contain a single function,
// which is primarily used for debugging transformations.
//
//===----------------------------------------------------------------------===//
#include "llvm/LLVMContext.h"
#include "llvm/Module.h"
#include "llvm/PassManager.h"
#include "llvm/Assembly/PrintModulePass.h"
#include "llvm/Bitcode/ReaderWriter.h"
#include "llvm/Transforms/IPO.h"
#include "llvm/Target/TargetData.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/IRReader.h"
#include "llvm/Support/ManagedStatic.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/PrettyStackTrace.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/SystemUtils.h"
#include "llvm/System/Signals.h"
#include <memory>
using namespace llvm;
// InputFilename - The filename to read from.
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bitcode file>"),
cl::init("-"), cl::value_desc("filename"));
static cl::opt<std::string>
OutputFilename("o", cl::desc("Specify output filename"),
cl::value_desc("filename"), cl::init("-"));
static cl::opt<bool>
Force("f", cl::desc("Enable binary output on terminals"));
static cl::opt<bool>
DeleteFn("delete", cl::desc("Delete specified Globals from Module"));
static cl::opt<bool>
Relink("relink",
cl::desc("Turn external linkage for callees of function to delete"));
// ExtractFunc - The function to extract from the module...
static cl::opt<std::string>
ExtractFunc("func", cl::desc("Specify function to extract"), cl::init(""),
cl::value_desc("function"));
// ExtractGlobal - The global to extract from the module...
static cl::opt<std::string>
ExtractGlobal("glob", cl::desc("Specify global to extract"), cl::init(""),
cl::value_desc("global"));
static cl::opt<bool>
OutputAssembly("S",
cl::desc("Write output as LLVM assembly"), cl::Hidden);
int main(int argc, char **argv) {
// Print a stack trace if we signal out.
sys::PrintStackTraceOnErrorSignal();
PrettyStackTraceProgram X(argc, argv);
LLVMContext &Context = getGlobalContext();
llvm_shutdown_obj Y; // Call llvm_shutdown() on exit.
cl::ParseCommandLineOptions(argc, argv, "llvm extractor\n");
SMDiagnostic Err;
std::auto_ptr<Module> M;
M.reset(ParseIRFile(InputFilename, Err, Context));
if (M.get() == 0) {
Err.Print(argv[0], errs());
return 1;
}
// Figure out which function we should extract
GlobalVariable *G = !ExtractGlobal.empty() ?
M.get()->getNamedGlobal(ExtractGlobal) : 0;
// Figure out which function we should extract
if (ExtractFunc.empty() && ExtractGlobal.empty()) ExtractFunc = "main";
Function *F = M.get()->getFunction(ExtractFunc);
if (F == 0 && G == 0) {
errs() << argv[0] << ": program doesn't contain function named '"
<< ExtractFunc << "' or a global named '" << ExtractGlobal << "'!\n";
return 1;
}
// In addition to deleting all other functions, we also want to spiff it
// up a little bit. Do this now.
PassManager Passes;
Passes.add(new TargetData(M.get())); // Use correct TargetData
// Either isolate the function or delete it from the Module
std::vector<GlobalValue*> GVs;
if (F) GVs.push_back(F);
if (G) GVs.push_back(G);
Passes.add(createGVExtractionPass(GVs, DeleteFn, Relink));
if (!DeleteFn)
Passes.add(createGlobalDCEPass()); // Delete unreachable globals
Passes.add(createDeadTypeEliminationPass()); // Remove dead types...
Passes.add(createStripDeadPrototypesPass()); // Remove dead func decls
// Make sure that the Output file gets unlinked from the disk if we get a
// SIGINT
sys::RemoveFileOnSignal(sys::Path(OutputFilename));
std::string ErrorInfo;
raw_fd_ostream Out(OutputFilename.c_str(), ErrorInfo,
raw_fd_ostream::F_Binary);
if (!ErrorInfo.empty()) {
errs() << ErrorInfo << '\n';
return 1;
}
if (OutputAssembly)
Passes.add(createPrintModulePass(&Out));
else if (Force || !CheckBitcodeOutputToConsole(Out, true))
Passes.add(createBitcodeWriterPass(Out));
Passes.run(*M.get());
return 0;
}
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