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