//===-- Internalize.cpp - Mark functions internal -------------------------===//
//
+// The LLVM Compiler Infrastructure
+//
+// 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.
//
//===----------------------------------------------------------------------===//
+#define DEBUG_TYPE "internalize"
#include "llvm/Transforms/IPO.h"
#include "llvm/Pass.h"
#include "llvm/Module.h"
-#include "Support/CommandLine.h"
-#include "Support/Debug.h"
-#include "Support/Statistic.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/Compiler.h"
+#include "llvm/Support/Debug.h"
+#include "llvm/ADT/Statistic.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(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.
+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"));
- // 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"));
+// 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);
- // 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);
-
- class InternalizePass : public Pass {
+namespace {
+ class VISIBILITY_HIDDEN 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:
- 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());
- }
-
- 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);
- }
- }
+ static char ID; // Pass identification, replacement for typeid
+ explicit InternalizePass(bool InternalizeEverything = true);
+ explicit InternalizePass(const std::vector <const char *>& exportList);
+ void LoadFile(const char *Filename);
+ virtual bool runOnModule(Module &M);
+ };
+} // end anonymous namespace
- virtual bool run(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...
+char InternalizePass::ID = 0;
+static RegisterPass<InternalizePass>
+X("internalize", "Internalize Global Symbols");
- // Preserve main, internalize all else.
- ExternalNames.insert(MainFunc->getName());
- }
+InternalizePass::InternalizePass(bool AllButMain)
+ : ModulePass((intptr_t)&ID), AllButMain(AllButMain){
+ 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());
+}
- 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");
- }
+InternalizePass::InternalizePass(const std::vector<const char *>&exportList)
+ : ModulePass((intptr_t)&ID), AllButMain(false){
+ for(std::vector<const char *>::const_iterator itr = exportList.begin();
+ itr != exportList.end(); itr++) {
+ ExternalNames.insert(*itr);
+ }
+}
- // 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->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);
+void InternalizePass::LoadFile(const char *Filename) {
+ // Load the APIFile...
+ std::ifstream In(Filename);
+ if (!In.good()) {
+ cerr << "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);
+ }
+}
- I->setLinkage(GlobalValue::InternalLinkage);
- Changed = true;
- ++NumGlobals;
- DEBUG(std::cerr << "Internalizing gvar " << I->getName() << "\n");
- }
+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());
+ }
+
+ bool Changed = false;
+
+ // Mark all functions not in the api as internal.
+ 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
+ !ExternalNames.count(I->getName())) {// Not marked to keep external?
+ I->setLinkage(GlobalValue::InternalLinkage);
+ Changed = true;
+ ++NumFunctions;
+ DOUT << "Internalizing func " << I->getName() << "\n";
+ }
+
+ // Never internalize the llvm.used symbol. It is used to implement
+ // attribute((used)).
+ ExternalNames.insert("llvm.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");
- return Changed;
+ // Mark all global variables with initializers that are not in the api as
+ // internal as well.
+ for (Module::global_iterator I = M.global_begin(), E = M.global_end();
+ I != E; ++I)
+ if (!I->isDeclaration() && !I->hasInternalLinkage() &&
+ !ExternalNames.count(I->getName())) {
+ I->setLinkage(GlobalValue::InternalLinkage);
+ Changed = true;
+ ++NumGlobals;
+ DOUT << "Internalized gvar " << I->getName() << "\n";
}
- };
+
+ return Changed;
+}
- RegisterOpt<InternalizePass> X("internalize", "Internalize Global Symbols");
-} // end anonymous namespace
+ModulePass *llvm::createInternalizePass(bool InternalizeEverything) {
+ return new InternalizePass(InternalizeEverything);
+}
-Pass *createInternalizePass() {
- return new InternalizePass();
+ModulePass *llvm::createInternalizePass(const std::vector <const char *> &el) {
+ return new InternalizePass(el);
}
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