2007-02-05 20:24:25 +00:00
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//===-- StripDeadPrototypes.cpp - Removed unused function declarations ----===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by Reid Spencer and is distributed under the
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// University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass loops over all of the functions in the input module, looking for
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// dead declarations and removes them.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Pass.h"
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#include "llvm/Module.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/Debug.h"
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#include <vector>
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using namespace llvm;
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STATISTIC(NumDeadPrototypes, "Number of dead prototypes removed");
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namespace {
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/// @brief Pass to remove unused function declarations.
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2007-02-05 21:45:12 +00:00
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class VISIBILITY_HIDDEN StripDeadPrototypesPass : public ModulePass {
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2007-02-05 20:24:25 +00:00
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public:
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StripDeadPrototypesPass() { }
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virtual bool runOnModule(Module &M);
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};
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RegisterPass<StripDeadPrototypesPass> X("strip-dead-prototypes",
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"Strip Unused Function Prototypes");
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2007-02-05 21:45:12 +00:00
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} // end anonymous namespace
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2007-02-05 20:24:25 +00:00
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bool StripDeadPrototypesPass::runOnModule(Module &M) {
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// Collect all the functions we want to erase
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std::vector<Function*> FuncsToErase;
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (I->isDeclaration() && // Function must be only a prototype
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I->use_empty()) { // Function must not be used
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FuncsToErase.push_back(&(*I));
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}
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// Erase the functions
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for (std::vector<Function*>::iterator I = FuncsToErase.begin(),
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E = FuncsToErase.end(); I != E; ++I )
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(*I)->eraseFromParent();
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// Increment the statistic
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NumDeadPrototypes += FuncsToErase.size();
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// Return an indication of whether we changed anything or not.
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return !FuncsToErase.empty();
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}
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ModulePass *llvm::createStripDeadPrototypesPass() {
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return new StripDeadPrototypesPass();
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}
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