diff options
Diffstat (limited to 'lib/Transforms/Utils/SpecialCaseList.cpp')
-rw-r--r-- | lib/Transforms/Utils/SpecialCaseList.cpp | 126 |
1 files changed, 126 insertions, 0 deletions
diff --git a/lib/Transforms/Utils/SpecialCaseList.cpp b/lib/Transforms/Utils/SpecialCaseList.cpp new file mode 100644 index 0000000000..a1083e3611 --- /dev/null +++ b/lib/Transforms/Utils/SpecialCaseList.cpp @@ -0,0 +1,126 @@ +//===-- SpecialCaseList.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 "llvm/Transforms/Utils/SpecialCaseList.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 { + +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()); + } + + // Iterate through each line in the blacklist file. + SmallVector<StringRef, 16> Lines; + SplitString(File.take()->getBuffer(), Lines, "\n\r"); + 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; + 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>::const_iterator I = Regexps.begin(), + E = Regexps.end(); I != E; ++I) { + Entries[I->getKey()] = new Regex(I->getValue()); + } +} + +bool SpecialCaseList::isIn(const Function &F) const { + return isIn(*F.getParent()) || inSection("fun", F.getName()); +} + +bool SpecialCaseList::isIn(const GlobalVariable &G) const { + return isIn(*G.getParent()) || inSection("global", G.getName()); +} + +bool SpecialCaseList::isIn(const Module &M) const { + 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 SpecialCaseList::isInInit(const GlobalVariable &G) const { + return (isIn(*G.getParent()) || + inSection("global-init", G.getName()) || + inSection("global-init-type", GetGVTypeString(G)) || + inSection("global-init-src", G.getParent()->getModuleIdentifier())); +} + +bool SpecialCaseList::inSection(const StringRef Section, + const StringRef Query) const { + StringMap<Regex*>::const_iterator I = Entries.find(Section); + if (I == Entries.end()) return false; + + Regex *FunctionRegex = I->getValue(); + return FunctionRegex->match(Query); +} + +} // namespace llvm |