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