106 lines
3.8 KiB
C++
106 lines
3.8 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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#include "Support/CommandLine.h"
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#include <fstream>
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#include <set>
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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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// APIFile - A file which contains a list of symbols that should not be marked
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// external.
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cl::opt<std::string>
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APIFile("internalize-public-api-file", cl::value_desc("filename"),
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cl::desc("A file containing list of symbol names to preserve"));
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// APIList - A list of symbols that should not be marked internal.
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cl::list<std::string>
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APIList("internalize-public-api-list", cl::value_desc("list"),
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cl::desc("A list of symbol names to preserve"),
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cl::CommaSeparated);
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class InternalizePass : public Pass {
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std::set<std::string> ExternalNames;
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public:
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InternalizePass() {
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if (!APIFile.empty()) // If a filename is specified, use it
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LoadFile(APIFile.c_str());
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else // Else, if a list is specified, use it.
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ExternalNames.insert(APIList.begin(), APIList.end());
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}
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void LoadFile(const char *Filename) {
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// Load the APIFile...
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std::ifstream In(Filename);
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if (!In.good()) {
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std::cerr << "WARNING: Internalize couldn't load file '" << Filename
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<< "'!\n";
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return; // Do not internalize anything...
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}
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while (In) {
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std::string Symbol;
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In >> Symbol;
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if (!Symbol.empty())
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ExternalNames.insert(Symbol);
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}
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}
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virtual bool run(Module &M) {
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// If no list or file of symbols was specified, check to see if there is a
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// "main" symbol defined in the module. If so, use it, otherwise do not
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// internalize the module, it must be a library or something.
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//
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if (ExternalNames.empty()) {
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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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// Preserve main, internalize all else.
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ExternalNames.insert(MainFunc->getName());
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}
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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->isExternal() && // Function must be defined here
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!I->hasInternalLinkage() && // Can't already have internal linkage
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!ExternalNames.count(I->getName())) {// Not marked to keep external?
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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->hasInternalLinkage() &&
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!ExternalNames.count(I->getName())) {
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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 Global Symbols");
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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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