StripDeadPrototypes.cpp [plain text]
#include "llvm/Transforms/IPO/StripDeadPrototypes.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
#include "llvm/Transforms/IPO.h"
using namespace llvm;
#define DEBUG_TYPE "strip-dead-prototypes"
STATISTIC(NumDeadPrototypes, "Number of dead prototypes removed");
static bool stripDeadPrototypes(Module &M) {
bool MadeChange = false;
for (Module::iterator I = M.begin(), E = M.end(); I != E; ) {
Function *F = &*I++;
if (F->isDeclaration() && F->use_empty()) {
F->eraseFromParent();
++NumDeadPrototypes;
MadeChange = true;
}
}
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ) {
GlobalVariable *GV = &*I++;
if (GV->isDeclaration() && GV->use_empty())
GV->eraseFromParent();
}
return MadeChange;
}
PreservedAnalyses StripDeadPrototypesPass::run(Module &M) {
if (stripDeadPrototypes(M))
return PreservedAnalyses::none();
return PreservedAnalyses::all();
}
namespace {
class StripDeadPrototypesLegacyPass : public ModulePass {
public:
static char ID; StripDeadPrototypesLegacyPass() : ModulePass(ID) {
initializeStripDeadPrototypesLegacyPassPass(
*PassRegistry::getPassRegistry());
}
bool runOnModule(Module &M) override {
return stripDeadPrototypes(M);
}
};
}
char StripDeadPrototypesLegacyPass::ID = 0;
INITIALIZE_PASS(StripDeadPrototypesLegacyPass, "strip-dead-prototypes",
"Strip Unused Function Prototypes", false, false)
ModulePass *llvm::createStripDeadPrototypesPass() {
return new StripDeadPrototypesLegacyPass();
}