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https://github.com/c64scene-ar/llvm-6502.git
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55e41ba3d2
* Internalize global variables with initializers * Add new stat to track global variable internalization * Only count functions that were not internal before in internalized function count git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@3163 91177308-0d34-0410-b5e6-96231b3b80d8
63 lines
2.3 KiB
C++
63 lines
2.3 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/StatisticReporter.h"
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namespace {
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Statistic<> NumFunctions("internalize\t- Number of functions internalized");
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Statistic<> NumGlobals ("internalize\t- 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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bool FoundMain = false; // Look for a function named main...
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (I->getName() == "main" && !I->isExternal() &&
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I->hasExternalLinkage()) {
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FoundMain = true;
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break;
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}
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if (!FoundMain) 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->getName() != "main" && // 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->setInternalLinkage(true);
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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->hasInitializer() && I->hasExternalLinkage()) {
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I->setInternalLinkage(true);
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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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