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#include <sectionify/SectionifyPass.h>
using namespace llvm;
static cl::list<std::string>
sectionMapOpt("sectionify-section-map",
cl::desc("Specify all the comma-separated symbol_regex/section pairs which need to be sectionified. \"NULL\" section doesn't sectionify."),
cl::ZeroOrMore, cl::CommaSeparated, cl::NotHidden, cl::ValueRequired);
static cl::list<std::string>
functionSectionMapOpt("sectionify-function-section-map",
cl::desc("Specify all the comma-separated function_regex/section pairs which need to be sectionified"),
cl::ZeroOrMore, cl::CommaSeparated, cl::NotHidden, cl::ValueRequired);
static cl::list<std::string>
dataSectionMapOpt("sectionify-data-section-map",
cl::desc("Specify all the comma-separated data_regex/section pairs which need to be sectionified"),
cl::ZeroOrMore, cl::CommaSeparated, cl::NotHidden, cl::ValueRequired);
static cl::opt<std::string>
prefixOpt("sectionify-prefix",
cl::desc("Specify the prefix-string for prefixing names of global variables and functions"),
cl::Optional, cl::NotHidden, cl::ValueRequired);
static cl::opt<bool>
sectionifyExternalFunctions("sectionify-function-external",
llvm::cl::desc("Also sectionify external functions"),
cl::init(false));
static cl::opt<bool>
sectionifyExternalData("sectionify-data-external",
llvm::cl::desc("Also sectionify external data"),
cl::init(false));
static cl::opt<bool>
sectionifySkipReadOnlyData("sectionify-data-skip-read-only",
llvm::cl::desc("Don't sectionify read-only data"),
cl::init(false));
static cl::opt<bool>
sectionifyTLSData("sectionify-data-tls",
llvm::cl::desc("Also sectionify tls data"),
cl::init(false));
static cl::opt<bool>
sectionifyNoOverride("sectionify-no-override",
llvm::cl::desc("Do not override existing sections"),
cl::init(false));
STATISTIC(numSectionifiedGVs, "Number of sectionified global variables");
STATISTIC(numSectionifiedFuncs, "Number of sectionified functions");
namespace llvm {
//===----------------------------------------------------------------------===//
// Constructors, destructor, and operators
//===----------------------------------------------------------------------===//
SectionifyPass::SectionifyPass() : ModulePass(ID) {}
//===----------------------------------------------------------------------===//
// Public methods
//===----------------------------------------------------------------------===//
bool SectionifyPass::runOnModule(Module &M) {
bool sectionified = false;
Module::GlobalListType &globalList = M.getGlobalList();
Module::FunctionListType &functionList = M.getFunctionList();
functionSectionMapOpt.insert(functionSectionMapOpt.end(), sectionMapOpt.begin(), sectionMapOpt.end());
dataSectionMapOpt.insert(dataSectionMapOpt.end(), sectionMapOpt.begin(), sectionMapOpt.end());
parseAndInitRegexMap(functionSectionMapOpt, functionRegexList, functionRegexMap, "function");
parseAndInitRegexMap(dataSectionMapOpt, dataRegexList, dataRegexMap, "data");
moduleName = "";
if ("" != prefixOpt && "%MODULE_NAME%" == prefixOpt)
{
PassUtil::getModuleName(M, NULL, NULL, &moduleName);
}
for (Module::global_iterator it = globalList.begin(); it != globalList.end(); ++it) {
GlobalVariable *GV = it;
if (GV->isDeclaration() && !sectionifyExternalData) {
DEBUG(errs() << "Skipping external GlobalVariable " << GV->getName() << "\n");
continue;
}
if (GV->isConstant() && sectionifySkipReadOnlyData) {
DEBUG(errs() << "Skipping read-only GlobalVariable " << GV->getName() << "\n");
continue;
}
if (GV->isThreadLocal() && !sectionifyTLSData) {
DEBUG(errs() << "Skipping TLS GlobalVariable " << GV->getName() << "\n");
continue;
}
if (GV->hasSection() && sectionifyNoOverride) {
DEBUG(errs() << "Skipping sectionified GlobalVariable " << GV->getName() << "\n");
continue;
}
if (GV->getName().startswith("llvm.")) {
DEBUG(errs() << "Skipping LLVM instrinsic GlobalVariable " << GV->getName() << "\n");
continue;
}
if (sectionify(GV, dataRegexList, dataRegexMap)) {
numSectionifiedGVs++;
sectionified = true;
}
}
for (Module::iterator it = functionList.begin(); it != functionList.end(); ++it) {
Function *F = it;
if (F->isDeclaration() && !sectionifyExternalFunctions) {
DEBUG(errs() << "Skipping external Function " << F->getName() << "\n");
continue;
}
if (F->hasSection() && sectionifyNoOverride) {
DEBUG(errs() << "Skipping sectionified Function " << F->getName() << "\n");
continue;
}
if (F->getName().startswith("llvm.")) {
DEBUG(errs() << "Skipping LLVM instrinsic Function " << F->getName() << "\n");
continue;
}
if (sectionify(F, functionRegexList, functionRegexMap)) {
numSectionifiedFuncs++;
sectionified = true;
}
}
return sectionified;
}
bool SectionifyPass::sectionifyFromRegex(GlobalObject *value, Regex *regex, std::string §ion)
{
bool returnValue = false;
if("NULL" != section && regex->match(value->getName(), NULL)) {
std::string trgSection = section;
std::string valueStrPrefix = "";
GlobalVariable *GV = dyn_cast<GlobalVariable>(value);
if (GV && GV->isConstant()) {
trgSection += "_ro";
valueStrPrefix = "read-only ";
}
DEBUG(errs() << "Sectionified " << valueStrPrefix << (isa<Function>(value) ? "Function " : "GlobalVariable ") << value->getName() << " with section " << trgSection << "\n");
value->setSection(trgSection);
if (value->hasCommonLinkage()) {
value->setLinkage(GlobalObject::WeakAnyLinkage);
}
returnValue = true;
}
if ("" != prefixOpt)
{
std::string originalName = value->getName();
std::string prefixString = "";
if ("" != moduleName)
{
prefixString = moduleName;
}
else
{
prefixString = prefixOpt;
}
DEBUG(errs() << "Prefixing the " << (isa<Function>(value) ? "Function name " : "GlobalVariable name ") << originalName << " with " << prefixString << "\n");
std::string prefixedName = prefixString + originalName;
value->setName(prefixedName);
returnValue = true;
}
return returnValue;
}
bool SectionifyPass::sectionify(GlobalObject *value, std::vector<Regex*> ®exList, std::map<Regex*, std::string> ®exMap)
{
std::map<Regex*, std::string>::iterator regexMapIt;
for (std::vector<Regex*>::iterator it = regexList.begin(); it != regexList.end(); ++it) {
Regex *regex = *it;
regexMapIt = regexMap.find(regex);
assert(regexMapIt != regexMap.end());
std::string section = regexMapIt->second;
if (sectionifyFromRegex(value, regex, section)) {
return true;
}
}
return false;
}
bool SectionifyPass::parseStringMapOpt(std::map<std::string, std::string> &map, std::vector<std::string> &keyList, std::vector<std::string> &stringList)
{
for (std::vector<std::string>::iterator it = stringList.begin(); it != stringList.end(); ++it) {
StringRef token = *it;
SmallVector< StringRef, 2 > tokenVector;
token.split(tokenVector, "/");
if(tokenVector.size() != 2) {
return false;
}
StringRef value = tokenVector.pop_back_val();
StringRef key = tokenVector.pop_back_val();
map.insert( std::pair<std::string, std::string>(key, value) );
keyList.push_back(key);
}
return true;
}
void SectionifyPass::parseAndInitRegexMap(cl::list<std::string> &stringListOpt, std::vector<Regex*> ®exList, std::map<Regex*, std::string> ®exMap, std::string regexType)
{
std::map<std::string, std::string> sectionMap;
std::vector<std::string> sectionList;
if (!parseStringMapOpt(sectionMap, sectionList, stringListOpt) || !initRegexMap(regexMap, regexList, sectionMap, sectionList, regexType)) {
stringListOpt.error("Invalid format!");
exit(1);
}
}
bool SectionifyPass::initRegexMap(std::map<Regex*, std::string> ®exMap, std::vector<Regex*> ®exList, std::map<std::string, std::string> &stringMap, std::vector<std::string> &stringList, std::string regexType)
{
std::map<std::string, std::string>::iterator stringMapIt;
for (std::vector<std::string>::iterator it = stringList.begin(); it != stringList.end(); ++it) {
std::string key = *it;
stringMapIt = stringMap.find(key);
assert(stringMapIt != stringMap.end());
std::string value = stringMapIt->second;
std::string error;
Regex *regex = new Regex(key, 0);
if(!regex->isValid(error)) {
return false;
}
DEBUG(errs() << "Using " << regexType << " regex " << key << " with section " << value << "\n");
regexMap.insert(std::pair<Regex*, std::string>(regex, value));
regexList.push_back(regex);
}
return true;
}
} // end namespace
char SectionifyPass::ID = 1;
static RegisterPass<SectionifyPass> AP("sectionify", "Sectionify Pass");
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