//
// The LLVM Compiler Infrastructure
//
-// This file was developed by the LLVM research group and is distributed under
-// the University of Illinois Open Source License. See LICENSE.TXT for details.
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
-// 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/Debug.h"
-#include "llvm/ADT/Statistic.h"
+#include "llvm/Support/raw_ostream.h"
#include <fstream>
#include <set>
using namespace llvm;
-namespace {
- Statistic<> NumFunctions("internalize", "Number of functions internalized");
- Statistic<> NumGlobals ("internalize", "Number of global vars internalized");
+STATISTIC(NumAliases , "Number of aliases internalized");
+STATISTIC(NumFunctions, "Number of functions internalized");
+STATISTIC(NumGlobals , "Number of global vars internalized");
- // APIFile - A file which contains a list of symbols that should not be marked
- // external.
- cl::opt<std::string>
- APIFile("internalize-public-api-file", cl::value_desc("filename"),
- cl::desc("A file containing list of symbol names to preserve"));
+// APIFile - A file which contains a list of symbols that should not be marked
+// external.
+static cl::opt<std::string>
+APIFile("internalize-public-api-file", cl::value_desc("filename"),
+ cl::desc("A file containing list of symbol names to preserve"));
- // APIList - A list of symbols that should not be marked internal.
- cl::list<std::string>
- APIList("internalize-public-api-list", cl::value_desc("list"),
- cl::desc("A list of symbol names to preserve"),
- cl::CommaSeparated);
+// APIList - A list of symbols that should not be marked internal.
+static cl::list<std::string>
+APIList("internalize-public-api-list", cl::value_desc("list"),
+ cl::desc("A list of symbol names to preserve"),
+ cl::CommaSeparated);
+namespace {
class InternalizePass : public ModulePass {
std::set<std::string> ExternalNames;
public:
- InternalizePass() {
- if (!APIFile.empty()) // If a filename is specified, use it
- LoadFile(APIFile.c_str());
- else // Else, if a list is specified, use it.
- ExternalNames.insert(APIList.begin(), APIList.end());
+ static char ID; // Pass identification, replacement for typeid
+ 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;
+INITIALIZE_PASS(InternalizePass, "internalize",
+ "Internalize Global Symbols", false, false)
+
+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(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);
+ }
+}
+
+void InternalizePass::LoadFile(const char *Filename) {
+ // Load the APIFile...
+ std::ifstream In(Filename);
+ if (!In.good()) {
+ errs() << "WARNING: Internalize couldn't load file '" << Filename
+ << "'! Continuing as if it's empty.\n";
+ return; // Just continue as if the file were empty
+ }
+ while (In) {
+ std::string Symbol;
+ In >> Symbol;
+ if (!Symbol.empty())
+ ExternalNames.insert(Symbol);
+ }
+}
+
+void InternalizePass::ClearExportList() {
+ ExternalNames.clear();
+}
+
+void InternalizePass::AddToExportList(const std::string &val) {
+ ExternalNames.insert(val);
+}
+
+bool InternalizePass::runOnModule(Module &M) {
+ 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
+ // 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;
+ DEBUG(dbgs() << "Internalizing func " << I->getName() << "\n");
}
- void LoadFile(const char *Filename) {
- // Load the APIFile...
- std::ifstream In(Filename);
- if (!In.good()) {
- std::cerr << "WARNING: Internalize couldn't load file '" << Filename
- << "'!\n";
- return; // Do not internalize anything...
- }
- while (In) {
- std::string Symbol;
- In >> Symbol;
- if (!Symbol.empty())
- ExternalNames.insert(Symbol);
- }
+ // 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.global_ctors");
+ ExternalNames.insert("llvm.global_dtors");
+ 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->hasLocalLinkage() &&
+ // Available externally is really just a "declaration with a body".
+ !I->hasAvailableExternallyLinkage() &&
+ !ExternalNames.count(I->getName())) {
+ I->setLinkage(GlobalValue::InternalLinkage);
+ Changed = true;
+ ++NumGlobals;
+ DEBUG(dbgs() << "Internalized gvar " << I->getName() << "\n");
}
- virtual bool runOnModule(Module &M) {
- // 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.
- //
- if (ExternalNames.empty()) {
- Function *MainFunc = M.getMainFunction();
- if (MainFunc == 0 || MainFunc->isExternal())
- return false; // No main found, must be a library...
-
- // Preserve main, internalize all else.
- ExternalNames.insert(MainFunc->getName());
- }
-
- 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->isExternal() && // Function must be defined here
- !I->hasInternalLinkage() && // Can't already have internal linkage
- !ExternalNames.count(I->getName())) {// Not marked to keep external?
- I->setLinkage(GlobalValue::InternalLinkage);
- Changed = true;
- ++NumFunctions;
- DEBUG(std::cerr << "Internalizing func " << I->getName() << "\n");
- }
-
- // Mark all global variables with initializers as internal as well...
- for (Module::global_iterator I = M.global_begin(), E = M.global_end(); I != E; ++I)
- if (!I->isExternal() && !I->hasInternalLinkage() &&
- !ExternalNames.count(I->getName())) {
- // Special case handling of the global ctor and dtor list. When we
- // internalize it, we mark it constant, which allows elimination of
- // the list if it's empty.
- //
- if (I->hasAppendingLinkage() && (I->getName() == "llvm.global_ctors"||
- I->getName() == "llvm.global_dtors"))
- I->setConstant(true);
-
- I->setLinkage(GlobalValue::InternalLinkage);
- Changed = true;
- ++NumGlobals;
- DEBUG(std::cerr << "Internalizing gvar " << I->getName() << "\n");
- }
-
- return Changed;
+ // 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");
}
- };
- RegisterOpt<InternalizePass> X("internalize", "Internalize Global Symbols");
-} // end anonymous namespace
+ return Changed;
+}
ModulePass *llvm::createInternalizePass() {
return new InternalizePass();
}
+
+ModulePass *llvm::createInternalizePass(ArrayRef<const char *> el) {
+ return new InternalizePass(el);
+}
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