//
//===----------------------------------------------------------------------===//
//
-// 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 and all
-// global variables with initializers are marked as internal.
+// This pass loops over all of the functions and variables in the input module.
+// If the function or variable is not in the list of external names given to
+// the pass it is marked as internal.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "internalize"
#include "llvm/Transforms/IPO.h"
+#include "llvm/ADT/Statistic.h"
+#include "llvm/Analysis/CallGraph.h"
+#include "llvm/IR/Module.h"
#include "llvm/Pass.h"
-#include "llvm/Module.h"
#include "llvm/Support/CommandLine.h"
-#include "llvm/Support/Compiler.h"
#include "llvm/Support/Debug.h"
-#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/raw_ostream.h"
#include <fstream>
#include <set>
using namespace llvm;
+STATISTIC(NumAliases , "Number of aliases internalized");
STATISTIC(NumFunctions, "Number of functions internalized");
STATISTIC(NumGlobals , "Number of global vars internalized");
cl::CommaSeparated);
namespace {
- class VISIBILITY_HIDDEN InternalizePass : public ModulePass {
+ class InternalizePass : public ModulePass {
std::set<std::string> ExternalNames;
- /// If no api symbols were specified and a main function is defined,
- /// assume the main function is the only API
- bool AllButMain;
public:
static char ID; // Pass identification, replacement for typeid
- explicit InternalizePass(bool InternalizeEverything = true);
- explicit InternalizePass(const std::vector <const char *>& exportList);
+ explicit InternalizePass();
+ explicit InternalizePass(ArrayRef<const char *> exportList);
void LoadFile(const char *Filename);
+ void ClearExportList();
+ void AddToExportList(const std::string &val);
virtual bool runOnModule(Module &M);
+
+ virtual void getAnalysisUsage(AnalysisUsage &AU) const {
+ AU.setPreservesCFG();
+ AU.addPreserved<CallGraph>();
+ }
};
} // end anonymous namespace
char InternalizePass::ID = 0;
-static RegisterPass<InternalizePass>
-X("internalize", "Internalize Global Symbols");
+INITIALIZE_PASS(InternalizePass, "internalize",
+ "Internalize Global Symbols", false, false)
-InternalizePass::InternalizePass(bool AllButMain)
- : ModulePass((intptr_t)&ID), AllButMain(AllButMain){
+InternalizePass::InternalizePass()
+ : ModulePass(ID) {
+ initializeInternalizePassPass(*PassRegistry::getPassRegistry());
if (!APIFile.empty()) // If a filename is specified, use it.
LoadFile(APIFile.c_str());
if (!APIList.empty()) // If a list is specified, use it as well.
ExternalNames.insert(APIList.begin(), APIList.end());
}
-InternalizePass::InternalizePass(const std::vector<const char *>&exportList)
- : ModulePass((intptr_t)&ID), AllButMain(false){
- for(std::vector<const char *>::const_iterator itr = exportList.begin();
+InternalizePass::InternalizePass(ArrayRef<const char *> exportList)
+ : ModulePass(ID){
+ initializeInternalizePassPass(*PassRegistry::getPassRegistry());
+ for(ArrayRef<const char *>::const_iterator itr = exportList.begin();
itr != exportList.end(); itr++) {
ExternalNames.insert(*itr);
}
// Load the APIFile...
std::ifstream In(Filename);
if (!In.good()) {
- cerr << "WARNING: Internalize couldn't load file '" << Filename
+ errs() << "WARNING: Internalize couldn't load file '" << Filename
<< "'! Continuing as if it's empty.\n";
return; // Just continue as if the file were empty
}
}
}
+void InternalizePass::ClearExportList() {
+ ExternalNames.clear();
+}
+
+void InternalizePass::AddToExportList(const std::string &val) {
+ ExternalNames.insert(val);
+}
+
bool InternalizePass::runOnModule(Module &M) {
- if (ExternalNames.empty()) {
- // Return if we're not in 'all but main' mode and have no external api
- if (!AllButMain)
- return false;
- // If no list or file of symbols was specified, check to see if there is a
- // "main" symbol defined in the module. If so, use it, otherwise do not
- // internalize the module, it must be a library or something.
- //
- Function *MainFunc = M.getFunction("main");
- if (MainFunc == 0 || MainFunc->isDeclaration())
- return false; // No main found, must be a library...
-
- // Preserve main, internalize all else.
- ExternalNames.insert(MainFunc->getName());
- }
-
+ CallGraph *CG = getAnalysisIfAvailable<CallGraph>();
+ CallGraphNode *ExternalNode = CG ? CG->getExternalCallingNode() : 0;
bool Changed = false;
-
+
+ // Never internalize functions which code-gen might insert.
+ // FIXME: We should probably add this (and the __stack_chk_guard) via some
+ // type of call-back in CodeGen.
+ ExternalNames.insert("__stack_chk_fail");
+
// Mark all functions not in the api as internal.
+ // FIXME: maybe use private linkage?
for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
if (!I->isDeclaration() && // Function must be defined here
- !I->hasInternalLinkage() && // Can't already have internal linkage
+ // Available externally is really just a "declaration with a body".
+ !I->hasAvailableExternallyLinkage() &&
+ !I->hasLocalLinkage() && // Can't already have internal linkage
!ExternalNames.count(I->getName())) {// Not marked to keep external?
I->setLinkage(GlobalValue::InternalLinkage);
+ // Remove a callgraph edge from the external node to this function.
+ if (ExternalNode) ExternalNode->removeOneAbstractEdgeTo((*CG)[I]);
Changed = true;
++NumFunctions;
- DOUT << "Internalizing func " << I->getName() << "\n";
+ DEBUG(dbgs() << "Internalizing func " << I->getName() << "\n");
}
-
+
// Never internalize the llvm.used symbol. It is used to implement
// attribute((used)).
+ // FIXME: Shouldn't this just filter on llvm.metadata section??
ExternalNames.insert("llvm.used");
-
+ ExternalNames.insert("llvm.compiler.used");
+
// Never internalize anchors used by the machine module info, else the info
// won't find them. (see MachineModuleInfo.)
- ExternalNames.insert("llvm.dbg.compile_units");
- ExternalNames.insert("llvm.dbg.global_variables");
- ExternalNames.insert("llvm.dbg.subprograms");
ExternalNames.insert("llvm.global_ctors");
ExternalNames.insert("llvm.global_dtors");
- ExternalNames.insert("llvm.noinline");
ExternalNames.insert("llvm.global.annotations");
-
+
+ // Never internalize symbols code-gen inserts.
+ ExternalNames.insert("__stack_chk_guard");
+
// Mark all global variables with initializers that are not in the api as
// internal as well.
+ // FIXME: maybe use private linkage?
for (Module::global_iterator I = M.global_begin(), E = M.global_end();
I != E; ++I)
- if (!I->isDeclaration() && !I->hasInternalLinkage() &&
+ if (!I->isDeclaration() && !I->hasLocalLinkage() &&
+ // Available externally is really just a "declaration with a body".
+ !I->hasAvailableExternallyLinkage() &&
!ExternalNames.count(I->getName())) {
I->setLinkage(GlobalValue::InternalLinkage);
Changed = true;
++NumGlobals;
- DOUT << "Internalized gvar " << I->getName() << "\n";
+ DEBUG(dbgs() << "Internalized gvar " << I->getName() << "\n");
+ }
+
+ // Mark all aliases that are not in the api as internal as well.
+ for (Module::alias_iterator I = M.alias_begin(), E = M.alias_end();
+ I != E; ++I)
+ if (!I->isDeclaration() && !I->hasInternalLinkage() &&
+ // Available externally is really just a "declaration with a body".
+ !I->hasAvailableExternallyLinkage() &&
+ !ExternalNames.count(I->getName())) {
+ I->setLinkage(GlobalValue::InternalLinkage);
+ Changed = true;
+ ++NumAliases;
+ DEBUG(dbgs() << "Internalized alias " << I->getName() << "\n");
}
-
+
return Changed;
}
-ModulePass *llvm::createInternalizePass(bool InternalizeEverything) {
- return new InternalizePass(InternalizeEverything);
+ModulePass *llvm::createInternalizePass() {
+ return new InternalizePass();
}
-ModulePass *llvm::createInternalizePass(const std::vector <const char *> &el) {
+ModulePass *llvm::createInternalizePass(ArrayRef<const char *> el) {
return new InternalizePass(el);
}
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