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//===-- Internalize.cpp - Mark functions internal -------------------------===//
//
// This pass loops over all of the functions in the input module, looking for a
// main function. If a main function is found, all other functions and all
// global variables with initializers are marked as internal.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/IPO.h"
#include "llvm/Pass.h"
#include "llvm/Module.h"
#include "Support/Statistic.h"
#include "Support/CommandLine.h"
#include <fstream>
#include <set>
namespace {
Statistic<> NumFunctions("internalize", "Number of functions internalized");
Statistic<> NumGlobals ("internalize", "Number of global vars internalized");
// APIFile - A file which contains a list of symbols that should not be marked
// external.
cl::opt<std::string>
APIFile("internalize-public-api-file", cl::value_desc("filename"),
cl::desc("A file containing list of globals to not internalize"));
class InternalizePass : public Pass {
std::set<std::string> ExternalNames;
public:
InternalizePass() {
if (!APIFile.empty())
LoadFile(APIFile.c_str());
else
ExternalNames.insert("main");
}
void LoadFile(const char *Filename) {
// Load the APIFile...
std::ifstream In(Filename);
if (!In.good()) {
std::cerr << "WARNING: Internalize couldn't load file '" << Filename
<< "'!: Not internalizing.\n";
return; // Do not internalize anything...
}
while (In) {
std::string Symbol;
In >> Symbol;
if (!Symbol.empty())
ExternalNames.insert(Symbol);
}
}
virtual bool run(Module &M) {
if (ExternalNames.empty()) return false; // Error loading file...
bool Changed = false;
// Found a main function, mark all functions not named main as internal.
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (!I->isExternal() && // Function must be defined here
!I->hasInternalLinkage() && // Can't already have internal linkage
!ExternalNames.count(I->getName())) {// Not marked to keep external?
I->setLinkage(GlobalValue::InternalLinkage);
Changed = true;
++NumFunctions;
DEBUG(std::cerr << "Internalizing func " << I->getName() << "\n");
}
// Mark all global variables with initializers as internal as well...
for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
if (!I->isExternal() && !I->hasInternalLinkage() &&
!ExternalNames.count(I->getName())) {
I->setLinkage(GlobalValue::InternalLinkage);
Changed = true;
++NumGlobals;
DEBUG(std::cerr << "Internalizing gvar " << I->getName() << "\n");
}
return Changed;
}
};
RegisterOpt<InternalizePass> X("internalize", "Internalize Global Symbols");
} // end anonymous namespace
Pass *createInternalizePass() {
return new InternalizePass();
}
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