llvm-6502/lib/Transforms/IPO/Internalize.cpp

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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 are marked
// as internal.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/IPO/Internalize.h"
#include "llvm/Pass.h"
#include "llvm/Module.h"
#include "llvm/Function.h"
class InternalizePass : public Pass {
const char *getPassName() const { return "Internalize Functions"; }
virtual bool run(Module *M) {
bool FoundMain = false; // Look for a function named main...
for (Module::iterator I = M->begin(), E = M->end(); I != E; ++I)
if ((*I)->getName() == "main" && !(*I)->isExternal()) {
FoundMain = true;
break;
}
if (!FoundMain) return false; // No main found, must be a library...
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)->getName() != "main" && // Leave the main function external
!(*I)->isExternal()) // Function must be defined here
(*I)->setInternalLinkage(Changed = true);
return Changed;
}
};
Pass *createInternalizePass() {
return new InternalizePass();
}