1 //===-- Internalize.cpp - Mark functions internal -------------------------===//
3 // This pass loops over all of the functions in the input module, looking for a
4 // main function. If a main function is found, all other functions and all
5 // global variables with initializers are marked as internal.
7 //===----------------------------------------------------------------------===//
9 #include "llvm/Transforms/IPO.h"
10 #include "llvm/Pass.h"
11 #include "llvm/Module.h"
12 #include "Support/Statistic.h"
13 #include "Support/CommandLine.h"
18 Statistic<> NumFunctions("internalize", "Number of functions internalized");
19 Statistic<> NumGlobals ("internalize", "Number of global vars internalized");
21 // APIFile - A file which contains a list of symbols that should not be marked
24 APIFile("internalize-public-api-file", cl::value_desc("filename"),
25 cl::desc("A file containing list of globals to not internalize"));
27 class InternalizePass : public Pass {
28 std::set<std::string> ExternalNames;
32 LoadFile(APIFile.c_str());
34 ExternalNames.insert("main");
37 void LoadFile(const char *Filename) {
38 // Load the APIFile...
39 std::ifstream In(Filename);
41 std::cerr << "WARNING: Internalize couldn't load file '" << Filename
42 << "'!: Not internalizing.\n";
43 return; // Do not internalize anything...
49 ExternalNames.insert(Symbol);
53 virtual bool run(Module &M) {
54 if (ExternalNames.empty()) return false; // Error loading file...
57 // Found a main function, mark all functions not named main as internal.
58 for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
59 if (!I->isExternal() && // Function must be defined here
60 !I->hasInternalLinkage() && // Can't already have internal linkage
61 !ExternalNames.count(I->getName())) {// Not marked to keep external?
62 I->setLinkage(GlobalValue::InternalLinkage);
65 DEBUG(std::cerr << "Internalizing func " << I->getName() << "\n");
68 // Mark all global variables with initializers as internal as well...
69 for (Module::giterator I = M.gbegin(), E = M.gend(); I != E; ++I)
70 if (!I->isExternal() && !I->hasInternalLinkage() &&
71 !ExternalNames.count(I->getName())) {
72 I->setLinkage(GlobalValue::InternalLinkage);
75 DEBUG(std::cerr << "Internalizing gvar " << I->getName() << "\n");
82 RegisterOpt<InternalizePass> X("internalize", "Internalize Global Symbols");
83 } // end anonymous namespace
85 Pass *createInternalizePass() {
86 return new InternalizePass();