+//===- extract.cpp - LLVM function extraction utility ---------------------===//
+//
+// The LLVM Compiler Infrastructure
+//
+// This file was developed by the LLVM research group and is distributed under
+// the University of Illinois Open Source License. See LICENSE.TXT for details.
+//
//===----------------------------------------------------------------------===//
-// LLVM extract Utility
//
// This utility changes the input module to only contain a single function,
// which is primarily used for debugging transformations.
#include "llvm/Bytecode/Reader.h"
#include "llvm/Bytecode/WriteBytecodePass.h"
#include "llvm/Transforms/IPO.h"
-#include "Support/CommandLine.h"
+#include "llvm/Target/TargetData.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/System/Signals.h"
#include <memory>
+#include <fstream>
+using namespace llvm;
// InputFilename - The filename to read from.
static cl::opt<std::string>
InputFilename(cl::Positional, cl::desc("<input bytecode file>"),
cl::init("-"), cl::value_desc("filename"));
-
-// ExtractFunc - The function to extract from the module... defaults to main.
static cl::opt<std::string>
-ExtractFunc("func", cl::desc("Specify function to extract"), cl::init("main"),
- cl::value_desc("function"));
+OutputFilename("o", cl::desc("Specify output filename"),
+ cl::value_desc("filename"), cl::init("-"));
+static cl::opt<bool>
+Force("f", cl::desc("Overwrite output files"));
-struct FunctionExtractorPass : public Pass {
- bool run(Module &M) {
- // Mark all global variables to be internal
- for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
- if (!I->isExternal()) {
- I->setInitializer(0); // Make all variables external
- I->setInternalLinkage(false); // Make sure it's not internal
- }
-
- Function *Named = 0;
+static cl::opt<bool>
+DeleteFn("delete", cl::desc("Delete specified function from Module"));
- // Loop over all of the functions in the module, dropping all references in
- // functions that are not the named function.
- for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
- // Check to see if this is the named function!
- if (I->getName() == ExtractFunc && !I->isExternal()) {
- if (Named) { // Two functions, same name?
- std::cerr << "extract ERROR: Two functions named: '" << ExtractFunc
- << "' found!\n";
- exit(1);
- }
-
- // Yes, it is. Keep track of it...
- Named = I;
+// ExtractFunc - The function to extract from the module... defaults to main.
+static cl::opt<std::string>
+ExtractFunc("func", cl::desc("Specify function to extract"), cl::init("main"),
+ cl::value_desc("function"));
- // Make sure it's globally accessable...
- Named->setInternalLinkage(false);
- }
-
- if (Named == 0) {
- std::cerr << "Warning: Function '" << ExtractFunc << "' not found!\n";
- return false;
+int main(int argc, char **argv) {
+ try {
+ cl::ParseCommandLineOptions(argc, argv, " llvm extractor\n");
+ sys::PrintStackTraceOnErrorSignal();
+
+ std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
+ if (M.get() == 0) {
+ std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
+ return 1;
}
-
- // All of the functions may be used by global variables or the named
- // function. Loop through them and create a new, external functions that
- // can be "used", instead of ones with bodies.
- //
- std::vector<Function*> NewFunctions;
-
- Function *Last = &M.back(); // Figure out where the last real fn is...
- for (Module::iterator I = M.begin(); ; ++I) {
- if (I->getName() != ExtractFunc) {
- Function *New = new Function(I->getFunctionType(), false, I->getName());
- I->setName(""); // Remove Old name
-
- // If it's not the named function, delete the body of the function
- I->dropAllReferences();
-
- M.getFunctionList().push_back(New);
- NewFunctions.push_back(New);
- }
-
- if (&*I == Last) break; // Stop after processing the last function
+ // Figure out which function we should extract
+ Function *F = M.get()->getNamedFunction(ExtractFunc);
+ if (F == 0) {
+ std::cerr << argv[0] << ": program doesn't contain function named '"
+ << ExtractFunc << "'!\n";
+ return 1;
}
- // Now that we have replacements all set up, loop through the module,
- // deleting the old functions, replacing them with the newly created
- // functions.
- if (!NewFunctions.empty()) {
- unsigned FuncNum = 0;
- Module::iterator I = M.begin();
- do {
- if (I->getName() != ExtractFunc) {
- // Make everything that uses the old function use the new dummy fn
- I->replaceAllUsesWith(NewFunctions[FuncNum++]);
-
- Function *Old = I;
- ++I; // Move the iterator to the new function
-
- // Delete the old function!
- M.getFunctionList().erase(Old);
-
- } else {
- ++I; // Skip the function we are extracting
- }
- } while (&*I != NewFunctions[0]);
+ // 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("extract", M.get())); // Use correct TargetData
+ // Either isolate the function or delete it from the Module
+ Passes.add(createFunctionExtractionPass(F, DeleteFn));
+ Passes.add(createGlobalDCEPass()); // Delete unreachable globals
+ Passes.add(createFunctionResolvingPass()); // Delete prototypes
+ Passes.add(createDeadTypeEliminationPass()); // Remove dead types...
+
+ std::ostream *Out = 0;
+
+ if (OutputFilename != "-") { // Not stdout?
+ if (!Force && std::ifstream(OutputFilename.c_str())) {
+ // If force is not specified, make sure not to overwrite a file!
+ std::cerr << argv[0] << ": error opening '" << OutputFilename
+ << "': file exists!\n"
+ << "Use -f command line argument to force output\n";
+ return 1;
+ }
+ std::ios::openmode io_mode = std::ios::out | std::ios::trunc |
+ std::ios::binary;
+ Out = new std::ofstream(OutputFilename.c_str(), io_mode);
+ } else { // Specified stdout
+ // FIXME: cout is not binary!
+ Out = &std::cout;
}
-
- return true;
- }
-};
-
-static RegisterPass<FunctionExtractorPass> X("extract", "Function Extractor");
+ Passes.add(new WriteBytecodePass(Out)); // Write bytecode to file...
+ Passes.run(*M.get());
-
-int main(int argc, char **argv) {
- cl::ParseCommandLineOptions(argc, argv, " llvm extractor\n");
-
- std::auto_ptr<Module> M(ParseBytecodeFile(InputFilename));
- if (M.get() == 0) {
- std::cerr << argv[0] << ": bytecode didn't read correctly.\n";
- return 1;
+ if (Out != &std::cout)
+ delete Out;
+ return 0;
+ } catch (const std::string& msg) {
+ std::cerr << argv[0] << ": " << msg << "\n";
+ } catch (...) {
+ std::cerr << argv[0] << ": Unexpected unknown exception occurred.\n";
}
-
- // In addition to just parsing the input from GCC, we also want to spiff it up
- // a little bit. Do this now.
- //
- PassManager Passes;
- Passes.add(new FunctionExtractorPass());
- Passes.add(createGlobalDCEPass()); // Delete unreachable globals
- Passes.add(createFunctionResolvingPass()); // Delete prototypes
- Passes.add(createConstantMergePass()); // Merge dup global constants
- Passes.add(createDeadTypeEliminationPass()); // Remove dead types...
- Passes.add(new WriteBytecodePass(&std::cout)); // Write bytecode to file...
-
- Passes.run(*M.get());
- return 0;
+ return 1;
}
projects / oota-llvm.git / blobdiff