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//===-- SpecialCaseList.cpp - special case list for sanitizers ------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This is a utility class for instrumentation passes (like AddressSanitizer
// or ThreadSanitizer) to avoid instrumenting some functions or global
// variables, or to instrument some functions or global variables in a specific
// way, based on a user-supplied list.
//
//===----------------------------------------------------------------------===//
#include "llvm/Transforms/Utils/SpecialCaseList.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/STLExtras.h"
#include "llvm/ADT/StringExtras.h"
#include "llvm/IR/DerivedTypes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalVariable.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/MemoryBuffer.h"
#include "llvm/Support/Regex.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
#include <string>
#include <utility>
namespace llvm {
SpecialCaseList::SpecialCaseList(const StringRef Path) {
// Validate and open blacklist file.
if (Path.empty()) return;
OwningPtr<MemoryBuffer> File;
if (error_code EC = MemoryBuffer::getFile(Path, File)) {
report_fatal_error("Can't open blacklist file: " + Path + ": " +
EC.message());
}
init(File.get());
}
SpecialCaseList::SpecialCaseList(const MemoryBuffer *MB) {
init(MB);
}
void SpecialCaseList::init(const MemoryBuffer *MB) {
// Iterate through each line in the blacklist file.
SmallVector<StringRef, 16> Lines;
SplitString(MB->getBuffer(), Lines, "\n\r");
StringMap<StringMap<std::string> > Regexps;
for (SmallVectorImpl<StringRef>::iterator I = Lines.begin(), E = Lines.end();
I != E; ++I) {
// Ignore empty lines and lines starting with "#"
if (I->empty() || I->startswith("#"))
continue;
// Get our prefix and unparsed regexp.
std::pair<StringRef, StringRef> SplitLine = I->split(":");
StringRef Prefix = SplitLine.first;
if (SplitLine.second.empty()) {
// Missing ':' in the line.
report_fatal_error("malformed blacklist line: " + SplitLine.first);
}
std::pair<StringRef, StringRef> SplitRegexp = SplitLine.second.split("=");
std::string Regexp = SplitRegexp.first;
StringRef Category = SplitRegexp.second;
// Backwards compatibility.
if (Prefix == "global-init") {
Prefix = "global";
Category = "init";
} else if (Prefix == "global-init-type") {
Prefix = "type";
Category = "init";
} else if (Prefix == "global-init-src") {
Prefix = "src";
Category = "init";
}
// Replace * with .*
for (size_t pos = 0; (pos = Regexp.find("*", pos)) != std::string::npos;
pos += strlen(".*")) {
Regexp.replace(pos, strlen("*"), ".*");
}
// Check that the regexp is valid.
Regex CheckRE(Regexp);
std::string Error;
if (!CheckRE.isValid(Error)) {
report_fatal_error("malformed blacklist regex: " + SplitLine.second +
": " + Error);
}
// Add this regexp into the proper group by its prefix.
if (!Regexps[Prefix][Category].empty())
Regexps[Prefix][Category] += "|";
Regexps[Prefix][Category] += Regexp;
}
// Iterate through each of the prefixes, and create Regexs for them.
for (StringMap<StringMap<std::string> >::const_iterator I = Regexps.begin(),
E = Regexps.end();
I != E; ++I) {
for (StringMap<std::string>::const_iterator II = I->second.begin(),
IE = I->second.end();
II != IE; ++II) {
Entries[I->getKey()][II->getKey()] = new Regex(II->getValue());
}
}
}
SpecialCaseList::~SpecialCaseList() {
for (StringMap<StringMap<Regex*> >::iterator I = Entries.begin(),
E = Entries.end();
I != E; ++I) {
DeleteContainerSeconds(I->second);
}
}
bool SpecialCaseList::findCategory(const Function &F,
StringRef &Category) const {
return findCategory(*F.getParent(), Category) ||
findCategory("fun", F.getName(), Category);
}
bool SpecialCaseList::isIn(const Function& F, const StringRef Category) const {
return isIn(*F.getParent(), Category) ||
inSectionCategory("fun", F.getName(), Category);
}
static StringRef GetGVTypeString(const GlobalVariable &G) {
// Types of GlobalVariables are always pointer types.
Type *GType = G.getType()->getElementType();
// For now we support blacklisting struct types only.
if (StructType *SGType = dyn_cast<StructType>(GType)) {
if (!SGType->isLiteral())
return SGType->getName();
}
return "<unknown type>";
}
bool SpecialCaseList::findCategory(const GlobalVariable &G,
StringRef &Category) const {
return findCategory(*G.getParent(), Category) ||
findCategory("global", G.getName(), Category) ||
findCategory("type", GetGVTypeString(G), Category);
}
bool SpecialCaseList::isIn(const GlobalVariable &G,
const StringRef Category) const {
return isIn(*G.getParent(), Category) ||
inSectionCategory("global", G.getName(), Category) ||
inSectionCategory("type", GetGVTypeString(G), Category);
}
bool SpecialCaseList::findCategory(const Module &M, StringRef &Category) const {
return findCategory("src", M.getModuleIdentifier(), Category);
}
bool SpecialCaseList::isIn(const Module &M, const StringRef Category) const {
return inSectionCategory("src", M.getModuleIdentifier(), Category);
}
bool SpecialCaseList::findCategory(const StringRef Section,
const StringRef Query,
StringRef &Category) const {
StringMap<StringMap<Regex *> >::const_iterator I = Entries.find(Section);
if (I == Entries.end()) return false;
for (StringMap<Regex *>::const_iterator II = I->second.begin(),
IE = I->second.end();
II != IE; ++II) {
Regex *FunctionRegex = II->getValue();
if (FunctionRegex->match(Query)) {
Category = II->first();
return true;
}
}
return false;
}
bool SpecialCaseList::inSectionCategory(const StringRef Section,
const StringRef Query,
const StringRef Category) const {
StringMap<StringMap<Regex *> >::const_iterator I = Entries.find(Section);
if (I == Entries.end()) return false;
StringMap<Regex *>::const_iterator II = I->second.find(Category);
if (II == I->second.end()) return false;
Regex *FunctionRegex = II->getValue();
return FunctionRegex->match(Query);
}
} // namespace llvm
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