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//===-- BlackList.cpp - blacklist 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 based on a user-supplied blacklist.
//
//===----------------------------------------------------------------------===//
#include "BlackList.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallVector.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 {
BlackList::BlackList(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());
}
// Iterate through each line in the blacklist file.
SmallVector<StringRef, 16> Lines;
SplitString(File.take()->getBuffer(), Lines, "\n\r");
StringMap<std::string> Regexps;
for (SmallVector<StringRef, 16>::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;
std::string Regexp = SplitLine.second;
if (Regexp.empty()) {
// Missing ':' in the line.
report_fatal_error("malformed blacklist line: " + SplitLine.first);
}
// 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].empty())
Regexps[Prefix] += "|";
Regexps[Prefix] += Regexp;
}
// Iterate through each of the prefixes, and create Regexs for them.
for (StringMap<std::string>::iterator I = Regexps.begin(), E = Regexps.end();
I != E; ++I) {
Entries[I->getKey()] = new Regex(I->getValue());
}
}
bool BlackList::isIn(const Function &F) {
return isIn(*F.getParent()) || inSection("fun", F.getName());
}
bool BlackList::isIn(const GlobalVariable &G) {
return isIn(*G.getParent()) || inSection("global", G.getName());
}
bool BlackList::isIn(const Module &M) {
return inSection("src", M.getModuleIdentifier());
}
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 BlackList::isInInit(const GlobalVariable &G) {
return (isIn(*G.getParent()) ||
inSection("global-init", G.getName()) ||
inSection("global-init-type", GetGVTypeString(G)));
}
bool BlackList::inSection(const StringRef Section, const StringRef Query) {
StringMap<Regex*>::iterator I = Entries.find(Section);
if (I == Entries.end()) return false;
Regex *FunctionRegex = I->getValue();
return FunctionRegex->match(Query);
}
} // namespace llvm
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