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the Transforms library. This reduces debug library size by 132 KB, debug binary size by 376 KB, and reduces link time for llvm tools slightly. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33939 91177308-0d34-0410-b5e6-96231b3b80d8
168 lines
6.1 KiB
C++
168 lines
6.1 KiB
C++
//===-- Internalize.cpp - Mark functions internal -------------------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file was developed by the LLVM research group and is distributed under
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// the University of Illinois Open Source License. See LICENSE.TXT for details.
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//
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//===----------------------------------------------------------------------===//
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//
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// This pass loops over all of the functions in the input module, looking for a
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// main function. If a main function is found, all other functions and all
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// global variables with initializers are marked as internal.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "internalize"
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#include "llvm/Transforms/IPO.h"
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#include "llvm/Pass.h"
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#include "llvm/Module.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/Compiler.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/ADT/Statistic.h"
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#include <fstream>
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#include <set>
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using namespace llvm;
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STATISTIC(NumFunctions, "Number of functions internalized");
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STATISTIC(NumGlobals , "Number of global vars internalized");
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namespace {
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// APIFile - A file which contains a list of symbols that should not be marked
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// external.
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cl::opt<std::string>
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APIFile("internalize-public-api-file", cl::value_desc("filename"),
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cl::desc("A file containing list of symbol names to preserve"));
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// APIList - A list of symbols that should not be marked internal.
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cl::list<std::string>
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APIList("internalize-public-api-list", cl::value_desc("list"),
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cl::desc("A list of symbol names to preserve"),
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cl::CommaSeparated);
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class VISIBILITY_HIDDEN InternalizePass : public ModulePass {
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std::set<std::string> ExternalNames;
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bool DontInternalize;
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public:
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InternalizePass(bool InternalizeEverything = true);
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InternalizePass(const std::vector <const char *>& exportList);
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void LoadFile(const char *Filename);
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virtual bool runOnModule(Module &M);
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};
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RegisterPass<InternalizePass> X("internalize", "Internalize Global Symbols");
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} // end anonymous namespace
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InternalizePass::InternalizePass(bool InternalizeEverything)
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: DontInternalize(false){
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if (!APIFile.empty()) // If a filename is specified, use it
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LoadFile(APIFile.c_str());
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else if (!APIList.empty()) // Else, if a list is specified, use it.
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ExternalNames.insert(APIList.begin(), APIList.end());
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else if (!InternalizeEverything)
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// Finally, if we're allowed to, internalize all but main.
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DontInternalize = true;
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}
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InternalizePass::InternalizePass(const std::vector<const char *>&exportList)
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: DontInternalize(false){
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for(std::vector<const char *>::const_iterator itr = exportList.begin();
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itr != exportList.end(); itr++) {
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ExternalNames.insert(*itr);
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}
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}
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void InternalizePass::LoadFile(const char *Filename) {
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// Load the APIFile...
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std::ifstream In(Filename);
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if (!In.good()) {
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cerr << "WARNING: Internalize couldn't load file '" << Filename << "'!\n";
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return; // Do not internalize anything...
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}
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while (In) {
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std::string Symbol;
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In >> Symbol;
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if (!Symbol.empty())
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ExternalNames.insert(Symbol);
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}
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}
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bool InternalizePass::runOnModule(Module &M) {
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if (DontInternalize) return false;
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// If no list or file of symbols was specified, check to see if there is a
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// "main" symbol defined in the module. If so, use it, otherwise do not
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// internalize the module, it must be a library or something.
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//
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if (ExternalNames.empty()) {
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Function *MainFunc = M.getFunction("main");
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if (MainFunc == 0 || MainFunc->isDeclaration())
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return false; // No main found, must be a library...
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// Preserve main, internalize all else.
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ExternalNames.insert(MainFunc->getName());
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}
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bool Changed = false;
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// Found a main function, mark all functions not named main as internal.
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for (Module::iterator I = M.begin(), E = M.end(); I != E; ++I)
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if (!I->isDeclaration() && // Function must be defined here
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!I->hasInternalLinkage() && // Can't already have internal linkage
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!ExternalNames.count(I->getName())) {// Not marked to keep external?
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I->setLinkage(GlobalValue::InternalLinkage);
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Changed = true;
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++NumFunctions;
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DOUT << "Internalizing func " << I->getName() << "\n";
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}
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// Never internalize the llvm.used symbol. It is used to implement
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// attribute((used)).
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ExternalNames.insert("llvm.used");
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// Never internalize anchors used by the machine module info, else the info
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// won't find them. (see MachineModuleInfo.)
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ExternalNames.insert("llvm.dbg.compile_units");
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ExternalNames.insert("llvm.dbg.global_variables");
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ExternalNames.insert("llvm.dbg.subprograms");
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// Mark all global variables with initializers as internal as well.
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for (Module::global_iterator I = M.global_begin(), E = M.global_end();
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I != E; ++I)
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if (!I->isDeclaration() && !I->hasInternalLinkage() &&
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!ExternalNames.count(I->getName())) {
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// Special case handling of the global ctor and dtor list. When we
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// internalize it, we mark it constant, which allows elimination of
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// the list if it's empty.
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//
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if (I->hasAppendingLinkage() && (I->getName() == "llvm.global_ctors" ||
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I->getName() == "llvm.global_dtors")) {
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// If the global ctors/dtors list has no uses, do not internalize it, as
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// there is no __main in this program, so the asmprinter should handle
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// it.
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if (I->use_empty()) continue;
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// Otherwise, also mark the list constant, as we know that it will not
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// be mutated any longer, and the makes simple IPO xforms automatically
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// better.
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I->setConstant(true);
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}
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I->setLinkage(GlobalValue::InternalLinkage);
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Changed = true;
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++NumGlobals;
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DOUT << "Internalized gvar " << I->getName() << "\n";
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}
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return Changed;
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}
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ModulePass *llvm::createInternalizePass(bool InternalizeEverything) {
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return new InternalizePass(InternalizeEverything);
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}
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ModulePass *llvm::createInternalizePass(const std::vector <const char *> &el) {
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return new InternalizePass(el);
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}
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