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https://github.com/RPCS3/llvm-mirror.git
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fa4f750f3e
llvm-svn: 5786
57 lines
2.1 KiB
C++
57 lines
2.1 KiB
C++
//===-- Internalize.cpp - Mark functions internal -------------------------===//
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//
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// This pass loops over all of the functions in the input module, looking for a
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// main function. If a main function is found, all other functions and all
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// global variables with initializers are marked as internal.
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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 "Support/Statistic.h"
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namespace {
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Statistic<> NumFunctions("internalize", "Number of functions internalized");
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Statistic<> NumGlobals ("internalize", "Number of global vars internalized");
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class InternalizePass : public Pass {
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virtual bool run(Module &M) {
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Function *MainFunc = M.getMainFunction();
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if (MainFunc == 0 || MainFunc->isExternal())
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return false; // No main found, must be a library...
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bool Changed = false;
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// Found a main function, mark all functions not named main as internal.
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (&*I != MainFunc && // Leave the main function external
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!I->isExternal() && // Function must be defined here
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!I->hasInternalLinkage()) { // Can't already have internal linkage
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I->setLinkage(GlobalValue::InternalLinkage);
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Changed = true;
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++NumFunctions;
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DEBUG(std::cerr << "Internalizing func " << I->getName() << "\n");
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}
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// Mark all global variables with initializers as internal as well...
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for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
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if (!I->isExternal() && I->hasExternalLinkage()) {
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I->setLinkage(GlobalValue::InternalLinkage);
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Changed = true;
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++NumGlobals;
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DEBUG(std::cerr << "Internalizing gvar " << I->getName() << "\n");
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}
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return Changed;
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}
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};
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RegisterOpt<InternalizePass> X("internalize", "Internalize Functions");
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} // end anonymous namespace
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Pass *createInternalizePass() {
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return new InternalizePass();
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}
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