#define DEBUG_TYPE "asan"
+#include "BlackList.h"
+#include "llvm/Function.h"
+#include "llvm/IRBuilder.h"
+#include "llvm/InlineAsm.h"
+#include "llvm/IntrinsicInst.h"
+#include "llvm/LLVMContext.h"
+#include "llvm/Module.h"
+#include "llvm/Type.h"
#include "llvm/ADT/ArrayRef.h"
#include "llvm/ADT/OwningPtr.h"
#include "llvm/ADT/SmallSet.h"
#include "llvm/ADT/SmallString.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/ADT/StringExtras.h"
-#include "llvm/Function.h"
-#include "llvm/IntrinsicInst.h"
-#include "llvm/LLVMContext.h"
-#include "llvm/Module.h"
+#include "llvm/ADT/Triple.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Support/DataTypes.h"
#include "llvm/Support/Debug.h"
-#include "llvm/Support/IRBuilder.h"
-#include "llvm/Support/MemoryBuffer.h"
-#include "llvm/Support/Regex.h"
#include "llvm/Support/raw_ostream.h"
#include "llvm/Support/system_error.h"
-#include "llvm/Target/TargetData.h"
+#include "llvm/DataLayout.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Transforms/Instrumentation.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
#include "llvm/Transforms/Utils/ModuleUtils.h"
-#include "llvm/Type.h"
#include <string>
#include <algorithm>
static const uint64_t kDefaultShadowScale = 3;
static const uint64_t kDefaultShadowOffset32 = 1ULL << 29;
static const uint64_t kDefaultShadowOffset64 = 1ULL << 44;
+static const uint64_t kDefaultShadowOffsetAndroid = 0;
static const size_t kMaxStackMallocSize = 1 << 16; // 64K
static const uintptr_t kCurrentStackFrameMagic = 0x41B58AB3;
static const char *kAsanReportErrorTemplate = "__asan_report_";
static const char *kAsanRegisterGlobalsName = "__asan_register_globals";
static const char *kAsanUnregisterGlobalsName = "__asan_unregister_globals";
+static const char *kAsanPoisonGlobalsName = "__asan_before_dynamic_init";
+static const char *kAsanUnpoisonGlobalsName = "__asan_after_dynamic_init";
static const char *kAsanInitName = "__asan_init";
+static const char *kAsanHandleNoReturnName = "__asan_handle_no_return";
static const char *kAsanMappingOffsetName = "__asan_mapping_offset";
static const char *kAsanMappingScaleName = "__asan_mapping_scale";
static const char *kAsanStackMallocName = "__asan_stack_malloc";
static const int kAsanStackRightRedzoneMagic = 0xf3;
static const int kAsanStackPartialRedzoneMagic = 0xf4;
+// Accesses sizes are powers of two: 1, 2, 4, 8, 16.
+static const size_t kNumberOfAccessSizes = 5;
+
// Command-line flags.
// This flag may need to be replaced with -f[no-]asan-reads.
cl::desc("instrument read instructions"), cl::Hidden, cl::init(true));
static cl::opt<bool> ClInstrumentWrites("asan-instrument-writes",
cl::desc("instrument write instructions"), cl::Hidden, cl::init(true));
+static cl::opt<bool> ClInstrumentAtomics("asan-instrument-atomics",
+ cl::desc("instrument atomic instructions (rmw, cmpxchg)"),
+ cl::Hidden, cl::init(true));
+static cl::opt<bool> ClAlwaysSlowPath("asan-always-slow-path",
+ cl::desc("use instrumentation with slow path for all accesses"),
+ cl::Hidden, cl::init(false));
+// This flag limits the number of instructions to be instrumented
+// in any given BB. Normally, this should be set to unlimited (INT_MAX),
+// but due to http://llvm.org/bugs/show_bug.cgi?id=12652 we temporary
+// set it to 10000.
+static cl::opt<int> ClMaxInsnsToInstrumentPerBB("asan-max-ins-per-bb",
+ cl::init(10000),
+ cl::desc("maximal number of instructions to instrument in any given BB"),
+ cl::Hidden);
// This flag may need to be replaced with -f[no]asan-stack.
static cl::opt<bool> ClStack("asan-stack",
cl::desc("Handle stack memory"), cl::Hidden, cl::init(true));
// This flag may need to be replaced with -f[no]asan-globals.
static cl::opt<bool> ClGlobals("asan-globals",
cl::desc("Handle global objects"), cl::Hidden, cl::init(true));
+static cl::opt<bool> ClInitializers("asan-initialization-order",
+ cl::desc("Handle C++ initializer order"), cl::Hidden, cl::init(false));
static cl::opt<bool> ClMemIntrin("asan-memintrin",
cl::desc("Handle memset/memcpy/memmove"), cl::Hidden, cl::init(true));
// This flag may need to be replaced with -fasan-blacklist.
cl::Hidden, cl::init(-1));
namespace {
-
-// Blacklisted functions are not instrumented.
-// The blacklist file contains one or more lines like this:
-// ---
-// fun:FunctionWildCard
-// ---
-// This is similar to the "ignore" feature of ThreadSanitizer.
-// http://code.google.com/p/data-race-test/wiki/ThreadSanitizerIgnores
-class BlackList {
- public:
- BlackList(const std::string &Path);
- bool isIn(const Function &F);
- private:
- Regex *Functions;
-};
-
/// AddressSanitizer: instrument the code in module to find memory bugs.
-struct AddressSanitizer : public ModulePass {
+struct AddressSanitizer : public FunctionPass {
AddressSanitizer();
virtual const char *getPassName() const;
void instrumentMop(Instruction *I);
void instrumentAddress(Instruction *OrigIns, IRBuilder<> &IRB,
Value *Addr, uint32_t TypeSize, bool IsWrite);
- Instruction *generateCrashCode(IRBuilder<> &IRB, Value *Addr,
- bool IsWrite, uint32_t TypeSize);
+ Value *createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong,
+ Value *ShadowValue, uint32_t TypeSize);
+ Instruction *generateCrashCode(Instruction *InsertBefore, Value *Addr,
+ bool IsWrite, size_t AccessSizeIndex);
bool instrumentMemIntrinsic(MemIntrinsic *MI);
void instrumentMemIntrinsicParam(Instruction *OrigIns, Value *Addr,
- Value *Size,
+ Value *Size,
Instruction *InsertBefore, bool IsWrite);
Value *memToShadow(Value *Shadow, IRBuilder<> &IRB);
- bool handleFunction(Module &M, Function &F);
- bool poisonStackInFunction(Module &M, Function &F);
- virtual bool runOnModule(Module &M);
+ bool runOnFunction(Function &F);
+ void createInitializerPoisonCalls(Module &M,
+ Value *FirstAddr, Value *LastAddr);
+ bool maybeInsertAsanInitAtFunctionEntry(Function &F);
+ bool poisonStackInFunction(Function &F);
+ virtual bool doInitialization(Module &M);
+ virtual bool doFinalization(Module &M);
bool insertGlobalRedzones(Module &M);
- BranchInst *splitBlockAndInsertIfThen(Instruction *SplitBefore, Value *Cmp);
static char ID; // Pass identification, replacement for typeid
private:
-
uint64_t getAllocaSizeInBytes(AllocaInst *AI) {
Type *Ty = AI->getAllocatedType();
- uint64_t SizeInBytes = TD->getTypeStoreSizeInBits(Ty) / 8;
+ uint64_t SizeInBytes = TD->getTypeAllocSize(Ty);
return SizeInBytes;
}
uint64_t getAlignedSize(uint64_t SizeInBytes) {
return getAlignedSize(SizeInBytes);
}
+ Function *checkInterfaceFunction(Constant *FuncOrBitcast);
+ bool ShouldInstrumentGlobal(GlobalVariable *G);
void PoisonStack(const ArrayRef<AllocaInst*> &AllocaVec, IRBuilder<> IRB,
Value *ShadowBase, bool DoPoison);
bool LooksLikeCodeInBug11395(Instruction *I);
+ void FindDynamicInitializers(Module &M);
+ bool HasDynamicInitializer(GlobalVariable *G);
- Module *CurrentModule;
LLVMContext *C;
- TargetData *TD;
+ DataLayout *TD;
uint64_t MappingOffset;
int MappingScale;
size_t RedzoneSize;
Type *IntptrPtrTy;
Function *AsanCtorFunction;
Function *AsanInitFunction;
+ Function *AsanStackMallocFunc, *AsanStackFreeFunc;
+ Function *AsanHandleNoReturnFunc;
Instruction *CtorInsertBefore;
OwningPtr<BlackList> BL;
+ // This array is indexed by AccessIsWrite and log2(AccessSize).
+ Function *AsanErrorCallback[2][kNumberOfAccessSizes];
+ InlineAsm *EmptyAsm;
+ SmallSet<GlobalValue*, 32> DynamicallyInitializedGlobals;
};
+
} // namespace
char AddressSanitizer::ID = 0;
INITIALIZE_PASS(AddressSanitizer, "asan",
"AddressSanitizer: detects use-after-free and out-of-bounds bugs.",
false, false)
-AddressSanitizer::AddressSanitizer() : ModulePass(ID) { }
-ModulePass *llvm::createAddressSanitizerPass() {
+AddressSanitizer::AddressSanitizer() : FunctionPass(ID) { }
+FunctionPass *llvm::createAddressSanitizerPass() {
return new AddressSanitizer();
}
return "AddressSanitizer";
}
+static size_t TypeSizeToSizeIndex(uint32_t TypeSize) {
+ size_t Res = CountTrailingZeros_32(TypeSize / 8);
+ assert(Res < kNumberOfAccessSizes);
+ return Res;
+}
+
// Create a constant for Str so that we can pass it to the run-time lib.
static GlobalVariable *createPrivateGlobalForString(Module &M, StringRef Str) {
- Constant *StrConst = ConstantArray::get(M.getContext(), Str);
+ Constant *StrConst = ConstantDataArray::getString(M.getContext(), Str);
return new GlobalVariable(M, StrConst->getType(), true,
GlobalValue::PrivateLinkage, StrConst, "");
}
// Split the basic block and insert an if-then code.
// Before:
// Head
-// SplitBefore
+// Cmp
// Tail
// After:
// Head
// if (Cmp)
-// NewBasicBlock
-// SplitBefore
+// ThenBlock
// Tail
//
-// Returns the NewBasicBlock's terminator.
-BranchInst *AddressSanitizer::splitBlockAndInsertIfThen(
- Instruction *SplitBefore, Value *Cmp) {
+// ThenBlock block is created and its terminator is returned.
+// If Unreachable, ThenBlock is terminated with UnreachableInst, otherwise
+// it is terminated with BranchInst to Tail.
+static TerminatorInst *splitBlockAndInsertIfThen(Value *Cmp, bool Unreachable) {
+ Instruction *SplitBefore = cast<Instruction>(Cmp)->getNextNode();
BasicBlock *Head = SplitBefore->getParent();
BasicBlock *Tail = Head->splitBasicBlock(SplitBefore);
TerminatorInst *HeadOldTerm = Head->getTerminator();
- BasicBlock *NewBasicBlock =
- BasicBlock::Create(*C, "", Head->getParent());
- BranchInst *HeadNewTerm = BranchInst::Create(/*ifTrue*/NewBasicBlock,
- /*ifFalse*/Tail,
- Cmp);
+ LLVMContext &C = Head->getParent()->getParent()->getContext();
+ BasicBlock *ThenBlock = BasicBlock::Create(C, "", Head->getParent(), Tail);
+ TerminatorInst *CheckTerm;
+ if (Unreachable)
+ CheckTerm = new UnreachableInst(C, ThenBlock);
+ else
+ CheckTerm = BranchInst::Create(Tail, ThenBlock);
+ BranchInst *HeadNewTerm =
+ BranchInst::Create(/*ifTrue*/ThenBlock, /*ifFalse*/Tail, Cmp);
ReplaceInstWithInst(HeadOldTerm, HeadNewTerm);
-
- BranchInst *CheckTerm = BranchInst::Create(Tail, NewBasicBlock);
return CheckTerm;
}
MappingOffset));
}
-void AddressSanitizer::instrumentMemIntrinsicParam(Instruction *OrigIns,
+void AddressSanitizer::instrumentMemIntrinsicParam(
+ Instruction *OrigIns,
Value *Addr, Value *Size, Instruction *InsertBefore, bool IsWrite) {
// Check the first byte.
{
bool AddressSanitizer::instrumentMemIntrinsic(MemIntrinsic *MI) {
Value *Dst = MI->getDest();
MemTransferInst *MemTran = dyn_cast<MemTransferInst>(MI);
- Value *Src = MemTran ? MemTran->getSource() : NULL;
+ Value *Src = MemTran ? MemTran->getSource() : 0;
Value *Length = MI->getLength();
Constant *ConstLength = dyn_cast<Constant>(Length);
IRBuilder<> IRB(InsertBefore);
Value *Cmp = IRB.CreateICmpNE(Length,
- Constant::getNullValue(Length->getType()));
- InsertBefore = splitBlockAndInsertIfThen(InsertBefore, Cmp);
+ Constant::getNullValue(Length->getType()));
+ InsertBefore = splitBlockAndInsertIfThen(Cmp, false);
}
instrumentMemIntrinsicParam(MI, Dst, Length, InsertBefore, true);
return true;
}
-static Value *getLDSTOperand(Instruction *I) {
+// If I is an interesting memory access, return the PointerOperand
+// and set IsWrite. Otherwise return NULL.
+static Value *isInterestingMemoryAccess(Instruction *I, bool *IsWrite) {
if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
+ if (!ClInstrumentReads) return NULL;
+ *IsWrite = false;
return LI->getPointerOperand();
}
- return cast<StoreInst>(*I).getPointerOperand();
+ if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
+ if (!ClInstrumentWrites) return NULL;
+ *IsWrite = true;
+ return SI->getPointerOperand();
+ }
+ if (AtomicRMWInst *RMW = dyn_cast<AtomicRMWInst>(I)) {
+ if (!ClInstrumentAtomics) return NULL;
+ *IsWrite = true;
+ return RMW->getPointerOperand();
+ }
+ if (AtomicCmpXchgInst *XCHG = dyn_cast<AtomicCmpXchgInst>(I)) {
+ if (!ClInstrumentAtomics) return NULL;
+ *IsWrite = true;
+ return XCHG->getPointerOperand();
+ }
+ return NULL;
}
-void AddressSanitizer::instrumentMop(Instruction *I) {
- int IsWrite = isa<StoreInst>(*I);
- Value *Addr = getLDSTOperand(I);
- if (ClOpt && ClOptGlobals && isa<GlobalVariable>(Addr)) {
- // We are accessing a global scalar variable. Nothing to catch here.
+void AddressSanitizer::FindDynamicInitializers(Module& M) {
+ // Clang generates metadata identifying all dynamically initialized globals.
+ NamedMDNode *DynamicGlobals =
+ M.getNamedMetadata("llvm.asan.dynamically_initialized_globals");
+ if (!DynamicGlobals)
return;
+ for (int i = 0, n = DynamicGlobals->getNumOperands(); i < n; ++i) {
+ MDNode *MDN = DynamicGlobals->getOperand(i);
+ assert(MDN->getNumOperands() == 1);
+ Value *VG = MDN->getOperand(0);
+ // The optimizer may optimize away a global entirely, in which case we
+ // cannot instrument access to it.
+ if (!VG)
+ continue;
+
+ GlobalVariable *G = cast<GlobalVariable>(VG);
+ DynamicallyInitializedGlobals.insert(G);
}
+}
+// Returns true if a global variable is initialized dynamically in this TU.
+bool AddressSanitizer::HasDynamicInitializer(GlobalVariable *G) {
+ return DynamicallyInitializedGlobals.count(G);
+}
+
+void AddressSanitizer::instrumentMop(Instruction *I) {
+ bool IsWrite = false;
+ Value *Addr = isInterestingMemoryAccess(I, &IsWrite);
+ assert(Addr);
+ if (ClOpt && ClOptGlobals) {
+ if (GlobalVariable *G = dyn_cast<GlobalVariable>(Addr)) {
+ // If initialization order checking is disabled, a simple access to a
+ // dynamically initialized global is always valid.
+ if (!ClInitializers)
+ return;
+ // If a global variable does not have dynamic initialization we don't
+ // have to instrument it. However, if a global has external linkage, we
+ // assume it has dynamic initialization, as it may have an initializer
+ // in a different TU.
+ if (G->getLinkage() != GlobalVariable::ExternalLinkage &&
+ !HasDynamicInitializer(G))
+ return;
+ }
+ }
+
Type *OrigPtrTy = Addr->getType();
Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType();
instrumentAddress(I, IRB, Addr, TypeSize, IsWrite);
}
+// Validate the result of Module::getOrInsertFunction called for an interface
+// function of AddressSanitizer. If the instrumented module defines a function
+// with the same name, their prototypes must match, otherwise
+// getOrInsertFunction returns a bitcast.
+Function *AddressSanitizer::checkInterfaceFunction(Constant *FuncOrBitcast) {
+ if (isa<Function>(FuncOrBitcast)) return cast<Function>(FuncOrBitcast);
+ FuncOrBitcast->dump();
+ report_fatal_error("trying to redefine an AddressSanitizer "
+ "interface function");
+}
+
Instruction *AddressSanitizer::generateCrashCode(
- IRBuilder<> &IRB, Value *Addr, bool IsWrite, uint32_t TypeSize) {
- // IsWrite and TypeSize are encoded in the function name.
- std::string FunctionName = std::string(kAsanReportErrorTemplate) +
- (IsWrite ? "store" : "load") + itostr(TypeSize / 8);
- Value *ReportWarningFunc = CurrentModule->getOrInsertFunction(
- FunctionName, IRB.getVoidTy(), IntptrTy, NULL);
- CallInst *Call = IRB.CreateCall(ReportWarningFunc, Addr);
- Call->setDoesNotReturn();
+ Instruction *InsertBefore, Value *Addr,
+ bool IsWrite, size_t AccessSizeIndex) {
+ IRBuilder<> IRB(InsertBefore);
+ CallInst *Call = IRB.CreateCall(AsanErrorCallback[IsWrite][AccessSizeIndex],
+ Addr);
+ // We don't do Call->setDoesNotReturn() because the BB already has
+ // UnreachableInst at the end.
+ // This EmptyAsm is required to avoid callback merge.
+ IRB.CreateCall(EmptyAsm);
return Call;
}
+Value *AddressSanitizer::createSlowPathCmp(IRBuilder<> &IRB, Value *AddrLong,
+ Value *ShadowValue,
+ uint32_t TypeSize) {
+ size_t Granularity = 1 << MappingScale;
+ // Addr & (Granularity - 1)
+ Value *LastAccessedByte = IRB.CreateAnd(
+ AddrLong, ConstantInt::get(IntptrTy, Granularity - 1));
+ // (Addr & (Granularity - 1)) + size - 1
+ if (TypeSize / 8 > 1)
+ LastAccessedByte = IRB.CreateAdd(
+ LastAccessedByte, ConstantInt::get(IntptrTy, TypeSize / 8 - 1));
+ // (uint8_t) ((Addr & (Granularity-1)) + size - 1)
+ LastAccessedByte = IRB.CreateIntCast(
+ LastAccessedByte, ShadowValue->getType(), false);
+ // ((uint8_t) ((Addr & (Granularity-1)) + size - 1)) >= ShadowValue
+ return IRB.CreateICmpSGE(LastAccessedByte, ShadowValue);
+}
+
void AddressSanitizer::instrumentAddress(Instruction *OrigIns,
IRBuilder<> &IRB, Value *Addr,
uint32_t TypeSize, bool IsWrite) {
IRB.CreateIntToPtr(ShadowPtr, ShadowPtrTy));
Value *Cmp = IRB.CreateICmpNE(ShadowValue, CmpVal);
-
- Instruction *CheckTerm = splitBlockAndInsertIfThen(
- cast<Instruction>(Cmp)->getNextNode(), Cmp);
- IRBuilder<> IRB2(CheckTerm);
-
+ size_t AccessSizeIndex = TypeSizeToSizeIndex(TypeSize);
size_t Granularity = 1 << MappingScale;
- if (TypeSize < 8 * Granularity) {
- // Addr & (Granularity - 1)
- Value *Lower3Bits = IRB2.CreateAnd(
- AddrLong, ConstantInt::get(IntptrTy, Granularity - 1));
- // (Addr & (Granularity - 1)) + size - 1
- Value *LastAccessedByte = IRB2.CreateAdd(
- Lower3Bits, ConstantInt::get(IntptrTy, TypeSize / 8 - 1));
- // (uint8_t) ((Addr & (Granularity-1)) + size - 1)
- LastAccessedByte = IRB2.CreateIntCast(
- LastAccessedByte, IRB.getInt8Ty(), false);
- // ((uint8_t) ((Addr & (Granularity-1)) + size - 1)) >= ShadowValue
- Value *Cmp2 = IRB2.CreateICmpSGE(LastAccessedByte, ShadowValue);
-
- CheckTerm = splitBlockAndInsertIfThen(CheckTerm, Cmp2);
- }
-
- IRBuilder<> IRB1(CheckTerm);
- Instruction *Crash = generateCrashCode(IRB1, AddrLong, IsWrite, TypeSize);
+ TerminatorInst *CrashTerm = 0;
+
+ if (ClAlwaysSlowPath || (TypeSize < 8 * Granularity)) {
+ TerminatorInst *CheckTerm = splitBlockAndInsertIfThen(Cmp, false);
+ assert(dyn_cast<BranchInst>(CheckTerm)->isUnconditional());
+ BasicBlock *NextBB = CheckTerm->getSuccessor(0);
+ IRB.SetInsertPoint(CheckTerm);
+ Value *Cmp2 = createSlowPathCmp(IRB, AddrLong, ShadowValue, TypeSize);
+ BasicBlock *CrashBlock =
+ BasicBlock::Create(*C, "", NextBB->getParent(), NextBB);
+ CrashTerm = new UnreachableInst(*C, CrashBlock);
+ BranchInst *NewTerm = BranchInst::Create(CrashBlock, NextBB, Cmp2);
+ ReplaceInstWithInst(CheckTerm, NewTerm);
+ } else {
+ CrashTerm = splitBlockAndInsertIfThen(Cmp, true);
+ }
+
+ Instruction *Crash =
+ generateCrashCode(CrashTerm, AddrLong, IsWrite, AccessSizeIndex);
Crash->setDebugLoc(OrigIns->getDebugLoc());
- ReplaceInstWithInst(CheckTerm, new UnreachableInst(*C));
}
-// This function replaces all global variables with new variables that have
-// trailing redzones. It also creates a function that poisons
-// redzones and inserts this function into llvm.global_ctors.
-bool AddressSanitizer::insertGlobalRedzones(Module &M) {
- SmallVector<GlobalVariable *, 16> GlobalsToChange;
+void AddressSanitizer::createInitializerPoisonCalls(Module &M,
+ Value *FirstAddr,
+ Value *LastAddr) {
+ // We do all of our poisoning and unpoisoning within _GLOBAL__I_a.
+ Function *GlobalInit = M.getFunction("_GLOBAL__I_a");
+ // If that function is not present, this TU contains no globals, or they have
+ // all been optimized away
+ if (!GlobalInit)
+ return;
- for (Module::GlobalListType::iterator G = M.getGlobalList().begin(),
- E = M.getGlobalList().end(); G != E; ++G) {
- Type *Ty = cast<PointerType>(G->getType())->getElementType();
- DEBUG(dbgs() << "GLOBAL: " << *G);
-
- if (!Ty->isSized()) continue;
- if (!G->hasInitializer()) continue;
- // Touch only those globals that will not be defined in other modules.
- // Don't handle ODR type linkages since other modules may be built w/o asan.
- if (G->getLinkage() != GlobalVariable::ExternalLinkage &&
- G->getLinkage() != GlobalVariable::PrivateLinkage &&
- G->getLinkage() != GlobalVariable::InternalLinkage)
- continue;
- // Two problems with thread-locals:
- // - The address of the main thread's copy can't be computed at link-time.
- // - Need to poison all copies, not just the main thread's one.
- if (G->isThreadLocal())
- continue;
- // For now, just ignore this Alloca if the alignment is large.
- if (G->getAlignment() > RedzoneSize) continue;
-
- // Ignore all the globals with the names starting with "\01L_OBJC_".
- // Many of those are put into the .cstring section. The linker compresses
- // that section by removing the spare \0s after the string terminator, so
- // our redzones get broken.
- if ((G->getName().find("\01L_OBJC_") == 0) ||
- (G->getName().find("\01l_OBJC_") == 0)) {
- DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G);
- continue;
+ // Set up the arguments to our poison/unpoison functions.
+ IRBuilder<> IRB(GlobalInit->begin()->getFirstInsertionPt());
+
+ // Declare our poisoning and unpoisoning functions.
+ Function *AsanPoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction(
+ kAsanPoisonGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL));
+ AsanPoisonGlobals->setLinkage(Function::ExternalLinkage);
+ Function *AsanUnpoisonGlobals = checkInterfaceFunction(M.getOrInsertFunction(
+ kAsanUnpoisonGlobalsName, IRB.getVoidTy(), NULL));
+ AsanUnpoisonGlobals->setLinkage(Function::ExternalLinkage);
+
+ // Add a call to poison all external globals before the given function starts.
+ IRB.CreateCall2(AsanPoisonGlobals, FirstAddr, LastAddr);
+
+ // Add calls to unpoison all globals before each return instruction.
+ for (Function::iterator I = GlobalInit->begin(), E = GlobalInit->end();
+ I != E; ++I) {
+ if (ReturnInst *RI = dyn_cast<ReturnInst>(I->getTerminator())) {
+ CallInst::Create(AsanUnpoisonGlobals, "", RI);
}
+ }
+}
+bool AddressSanitizer::ShouldInstrumentGlobal(GlobalVariable *G) {
+ Type *Ty = cast<PointerType>(G->getType())->getElementType();
+ DEBUG(dbgs() << "GLOBAL: " << *G << "\n");
+
+ if (BL->isIn(*G)) return false;
+ if (!Ty->isSized()) return false;
+ if (!G->hasInitializer()) return false;
+ // Touch only those globals that will not be defined in other modules.
+ // Don't handle ODR type linkages since other modules may be built w/o asan.
+ if (G->getLinkage() != GlobalVariable::ExternalLinkage &&
+ G->getLinkage() != GlobalVariable::PrivateLinkage &&
+ G->getLinkage() != GlobalVariable::InternalLinkage)
+ return false;
+ // Two problems with thread-locals:
+ // - The address of the main thread's copy can't be computed at link-time.
+ // - Need to poison all copies, not just the main thread's one.
+ if (G->isThreadLocal())
+ return false;
+ // For now, just ignore this Alloca if the alignment is large.
+ if (G->getAlignment() > RedzoneSize) return false;
+
+ // Ignore all the globals with the names starting with "\01L_OBJC_".
+ // Many of those are put into the .cstring section. The linker compresses
+ // that section by removing the spare \0s after the string terminator, so
+ // our redzones get broken.
+ if ((G->getName().find("\01L_OBJC_") == 0) ||
+ (G->getName().find("\01l_OBJC_") == 0)) {
+ DEBUG(dbgs() << "Ignoring \\01L_OBJC_* global: " << *G);
+ return false;
+ }
+
+ if (G->hasSection()) {
+ StringRef Section(G->getSection());
// Ignore the globals from the __OBJC section. The ObjC runtime assumes
// those conform to /usr/lib/objc/runtime.h, so we can't add redzones to
// them.
- if (G->hasSection()) {
- StringRef Section(G->getSection());
- if ((Section.find("__OBJC,") == 0) ||
- (Section.find("__DATA, __objc_") == 0)) {
- DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G);
- continue;
- }
+ if ((Section.find("__OBJC,") == 0) ||
+ (Section.find("__DATA, __objc_") == 0)) {
+ DEBUG(dbgs() << "Ignoring ObjC runtime global: " << *G);
+ return false;
+ }
+ // See http://code.google.com/p/address-sanitizer/issues/detail?id=32
+ // Constant CFString instances are compiled in the following way:
+ // -- the string buffer is emitted into
+ // __TEXT,__cstring,cstring_literals
+ // -- the constant NSConstantString structure referencing that buffer
+ // is placed into __DATA,__cfstring
+ // Therefore there's no point in placing redzones into __DATA,__cfstring.
+ // Moreover, it causes the linker to crash on OS X 10.7
+ if (Section.find("__DATA,__cfstring") == 0) {
+ DEBUG(dbgs() << "Ignoring CFString: " << *G);
+ return false;
}
+ }
+
+ return true;
+}
- GlobalsToChange.push_back(G);
+// This function replaces all global variables with new variables that have
+// trailing redzones. It also creates a function that poisons
+// redzones and inserts this function into llvm.global_ctors.
+bool AddressSanitizer::insertGlobalRedzones(Module &M) {
+ SmallVector<GlobalVariable *, 16> GlobalsToChange;
+
+ for (Module::GlobalListType::iterator G = M.global_begin(),
+ E = M.global_end(); G != E; ++G) {
+ if (ShouldInstrumentGlobal(G))
+ GlobalsToChange.push_back(G);
}
size_t n = GlobalsToChange.size();
// size_t size;
// size_t size_with_redzone;
// const char *name;
+ // size_t has_dynamic_init;
// We initialize an array of such structures and pass it to a run-time call.
StructType *GlobalStructTy = StructType::get(IntptrTy, IntptrTy,
- IntptrTy, IntptrTy, NULL);
- SmallVector<Constant *, 16> Initializers(n);
+ IntptrTy, IntptrTy,
+ IntptrTy, NULL);
+ SmallVector<Constant *, 16> Initializers(n), DynamicInit;
IRBuilder<> IRB(CtorInsertBefore);
+ if (ClInitializers)
+ FindDynamicInitializers(M);
+
+ // The addresses of the first and last dynamically initialized globals in
+ // this TU. Used in initialization order checking.
+ Value *FirstDynamic = 0, *LastDynamic = 0;
+
for (size_t i = 0; i < n; i++) {
GlobalVariable *G = GlobalsToChange[i];
PointerType *PtrTy = cast<PointerType>(G->getType());
Type *Ty = PtrTy->getElementType();
- uint64_t SizeInBytes = TD->getTypeStoreSizeInBits(Ty) / 8;
+ uint64_t SizeInBytes = TD->getTypeAllocSize(Ty);
uint64_t RightRedzoneSize = RedzoneSize +
(RedzoneSize - (SizeInBytes % RedzoneSize));
Type *RightRedZoneTy = ArrayType::get(IRB.getInt8Ty(), RightRedzoneSize);
+ // Determine whether this global should be poisoned in initialization.
+ bool GlobalHasDynamicInitializer = HasDynamicInitializer(G);
+ // Don't check initialization order if this global is blacklisted.
+ GlobalHasDynamicInitializer &= !BL->isInInit(*G);
StructType *NewTy = StructType::get(Ty, RightRedZoneTy, NULL);
Constant *NewInitializer = ConstantStruct::get(
// Create a new global variable with enough space for a redzone.
GlobalVariable *NewGlobal = new GlobalVariable(
M, NewTy, G->isConstant(), G->getLinkage(),
- NewInitializer, "", G, G->isThreadLocal());
+ NewInitializer, "", G, G->getThreadLocalMode());
NewGlobal->copyAttributesFrom(G);
NewGlobal->setAlignment(RedzoneSize);
Indices2[1] = IRB.getInt32(0);
G->replaceAllUsesWith(
- ConstantExpr::getGetElementPtr(NewGlobal, Indices2, 2));
+ ConstantExpr::getGetElementPtr(NewGlobal, Indices2, true));
NewGlobal->takeName(G);
G->eraseFromParent();
ConstantInt::get(IntptrTy, SizeInBytes),
ConstantInt::get(IntptrTy, SizeInBytes + RightRedzoneSize),
ConstantExpr::getPointerCast(Name, IntptrTy),
+ ConstantInt::get(IntptrTy, GlobalHasDynamicInitializer),
NULL);
- DEBUG(dbgs() << "NEW GLOBAL:\n" << *NewGlobal);
+
+ // Populate the first and last globals declared in this TU.
+ if (ClInitializers && GlobalHasDynamicInitializer) {
+ LastDynamic = ConstantExpr::getPointerCast(NewGlobal, IntptrTy);
+ if (FirstDynamic == 0)
+ FirstDynamic = LastDynamic;
+ }
+
+ DEBUG(dbgs() << "NEW GLOBAL: " << *NewGlobal << "\n");
}
ArrayType *ArrayOfGlobalStructTy = ArrayType::get(GlobalStructTy, n);
M, ArrayOfGlobalStructTy, false, GlobalVariable::PrivateLinkage,
ConstantArray::get(ArrayOfGlobalStructTy, Initializers), "");
- Function *AsanRegisterGlobals = cast<Function>(M.getOrInsertFunction(
- kAsanRegisterGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL));
+ // Create calls for poisoning before initializers run and unpoisoning after.
+ if (ClInitializers && FirstDynamic && LastDynamic)
+ createInitializerPoisonCalls(M, FirstDynamic, LastDynamic);
+
+ Function *AsanRegisterGlobals = checkInterfaceFunction(M.getOrInsertFunction(
+ kAsanRegisterGlobalsName, IRB.getVoidTy(),
+ IntptrTy, IntptrTy, NULL));
AsanRegisterGlobals->setLinkage(Function::ExternalLinkage);
IRB.CreateCall2(AsanRegisterGlobals,
GlobalValue::InternalLinkage, kAsanModuleDtorName, &M);
BasicBlock *AsanDtorBB = BasicBlock::Create(*C, "", AsanDtorFunction);
IRBuilder<> IRB_Dtor(ReturnInst::Create(*C, AsanDtorBB));
- Function *AsanUnregisterGlobals = cast<Function>(M.getOrInsertFunction(
- kAsanUnregisterGlobalsName, IRB.getVoidTy(), IntptrTy, IntptrTy, NULL));
+ Function *AsanUnregisterGlobals =
+ checkInterfaceFunction(M.getOrInsertFunction(
+ kAsanUnregisterGlobalsName,
+ IRB.getVoidTy(), IntptrTy, IntptrTy, NULL));
AsanUnregisterGlobals->setLinkage(Function::ExternalLinkage);
IRB_Dtor.CreateCall2(AsanUnregisterGlobals,
}
// virtual
-bool AddressSanitizer::runOnModule(Module &M) {
+bool AddressSanitizer::doInitialization(Module &M) {
// Initialize the private fields. No one has accessed them before.
- TD = getAnalysisIfAvailable<TargetData>();
+ TD = getAnalysisIfAvailable<DataLayout>();
+
if (!TD)
return false;
BL.reset(new BlackList(ClBlackListFile));
- CurrentModule = &M;
C = &(M.getContext());
- LongSize = TD->getPointerSizeInBits();
+ LongSize = TD->getPointerSizeInBits(0);
IntptrTy = Type::getIntNTy(*C, LongSize);
IntptrPtrTy = PointerType::get(IntptrTy, 0);
// call __asan_init in the module ctor.
IRBuilder<> IRB(CtorInsertBefore);
- AsanInitFunction = cast<Function>(
+ AsanInitFunction = checkInterfaceFunction(
M.getOrInsertFunction(kAsanInitName, IRB.getVoidTy(), NULL));
AsanInitFunction->setLinkage(Function::ExternalLinkage);
IRB.CreateCall(AsanInitFunction);
- MappingOffset = LongSize == 32
- ? kDefaultShadowOffset32 : kDefaultShadowOffset64;
+ // Create __asan_report* callbacks.
+ for (size_t AccessIsWrite = 0; AccessIsWrite <= 1; AccessIsWrite++) {
+ for (size_t AccessSizeIndex = 0; AccessSizeIndex < kNumberOfAccessSizes;
+ AccessSizeIndex++) {
+ // IsWrite and TypeSize are encoded in the function name.
+ std::string FunctionName = std::string(kAsanReportErrorTemplate) +
+ (AccessIsWrite ? "store" : "load") + itostr(1 << AccessSizeIndex);
+ // If we are merging crash callbacks, they have two parameters.
+ AsanErrorCallback[AccessIsWrite][AccessSizeIndex] = cast<Function>(
+ M.getOrInsertFunction(FunctionName, IRB.getVoidTy(), IntptrTy, NULL));
+ }
+ }
+
+ AsanStackMallocFunc = checkInterfaceFunction(M.getOrInsertFunction(
+ kAsanStackMallocName, IntptrTy, IntptrTy, IntptrTy, NULL));
+ AsanStackFreeFunc = checkInterfaceFunction(M.getOrInsertFunction(
+ kAsanStackFreeName, IRB.getVoidTy(),
+ IntptrTy, IntptrTy, IntptrTy, NULL));
+ AsanHandleNoReturnFunc = checkInterfaceFunction(M.getOrInsertFunction(
+ kAsanHandleNoReturnName, IRB.getVoidTy(), NULL));
+
+ // We insert an empty inline asm after __asan_report* to avoid callback merge.
+ EmptyAsm = InlineAsm::get(FunctionType::get(IRB.getVoidTy(), false),
+ StringRef(""), StringRef(""),
+ /*hasSideEffects=*/true);
+
+ llvm::Triple targetTriple(M.getTargetTriple());
+ bool isAndroid = targetTriple.getEnvironment() == llvm::Triple::Android;
+
+ MappingOffset = isAndroid ? kDefaultShadowOffsetAndroid :
+ (LongSize == 32 ? kDefaultShadowOffset32 : kDefaultShadowOffset64);
if (ClMappingOffsetLog >= 0) {
if (ClMappingOffsetLog == 0) {
// special case
// For scales 6 and 7, the redzone has to be 64 and 128 bytes respectively.
RedzoneSize = std::max(32, (int)(1 << MappingScale));
- bool Res = false;
- if (ClGlobals)
- Res |= insertGlobalRedzones(M);
+ if (ClMappingOffsetLog >= 0) {
+ // Tell the run-time the current values of mapping offset and scale.
+ GlobalValue *asan_mapping_offset =
+ new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage,
+ ConstantInt::get(IntptrTy, MappingOffset),
+ kAsanMappingOffsetName);
+ // Read the global, otherwise it may be optimized away.
+ IRB.CreateLoad(asan_mapping_offset, true);
+ }
+ if (ClMappingScale) {
+ GlobalValue *asan_mapping_scale =
+ new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage,
+ ConstantInt::get(IntptrTy, MappingScale),
+ kAsanMappingScaleName);
+ // Read the global, otherwise it may be optimized away.
+ IRB.CreateLoad(asan_mapping_scale, true);
+ }
- // Tell the run-time the current values of mapping offset and scale.
- GlobalValue *asan_mapping_offset =
- new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage,
- ConstantInt::get(IntptrTy, MappingOffset),
- kAsanMappingOffsetName);
- GlobalValue *asan_mapping_scale =
- new GlobalVariable(M, IntptrTy, true, GlobalValue::LinkOnceODRLinkage,
- ConstantInt::get(IntptrTy, MappingScale),
- kAsanMappingScaleName);
- // Read these globals, otherwise they may be optimized away.
- IRB.CreateLoad(asan_mapping_scale, true);
- IRB.CreateLoad(asan_mapping_offset, true);
+ appendToGlobalCtors(M, AsanCtorFunction, kAsanCtorAndCtorPriority);
+ return true;
+}
- for (Module::iterator F = M.begin(), E = M.end(); F != E; ++F) {
- if (F->isDeclaration()) continue;
- Res |= handleFunction(M, *F);
- }
+bool AddressSanitizer::doFinalization(Module &M) {
+ // We transform the globals at the very end so that the optimization analysis
+ // works on the original globals.
+ if (ClGlobals)
+ return insertGlobalRedzones(M);
+ return false;
+}
- appendToGlobalCtors(M, AsanCtorFunction, kAsanCtorAndCtorPriority);
- return Res;
+bool AddressSanitizer::maybeInsertAsanInitAtFunctionEntry(Function &F) {
+ // For each NSObject descendant having a +load method, this method is invoked
+ // by the ObjC runtime before any of the static constructors is called.
+ // Therefore we need to instrument such methods with a call to __asan_init
+ // at the beginning in order to initialize our runtime before any access to
+ // the shadow memory.
+ // We cannot just ignore these methods, because they may call other
+ // instrumented functions.
+ if (F.getName().find(" load]") != std::string::npos) {
+ IRBuilder<> IRB(F.begin()->begin());
+ IRB.CreateCall(AsanInitFunction);
+ return true;
+ }
+ return false;
}
-bool AddressSanitizer::handleFunction(Module &M, Function &F) {
+bool AddressSanitizer::runOnFunction(Function &F) {
if (BL->isIn(F)) return false;
if (&F == AsanCtorFunction) return false;
+ DEBUG(dbgs() << "ASAN instrumenting:\n" << F << "\n");
+
+ // If needed, insert __asan_init before checking for AddressSafety attr.
+ maybeInsertAsanInitAtFunctionEntry(F);
+
+ if (!F.getFnAttributes().hasAttribute(Attributes::AddressSafety))
+ return false;
if (!ClDebugFunc.empty() && ClDebugFunc != F.getName())
return false;
- // We want to instrument every address only once per basic block
- // (unless there are calls between uses).
+
+ // We want to instrument every address only once per basic block (unless there
+ // are calls between uses).
SmallSet<Value*, 16> TempsToInstrument;
SmallVector<Instruction*, 16> ToInstrument;
+ SmallVector<Instruction*, 8> NoReturnCalls;
+ bool IsWrite;
// Fill the set of memory operations to instrument.
for (Function::iterator FI = F.begin(), FE = F.end();
FI != FE; ++FI) {
TempsToInstrument.clear();
+ int NumInsnsPerBB = 0;
for (BasicBlock::iterator BI = FI->begin(), BE = FI->end();
BI != BE; ++BI) {
if (LooksLikeCodeInBug11395(BI)) return false;
- if ((isa<LoadInst>(BI) && ClInstrumentReads) ||
- (isa<StoreInst>(BI) && ClInstrumentWrites)) {
- Value *Addr = getLDSTOperand(BI);
+ if (Value *Addr = isInterestingMemoryAccess(BI, &IsWrite)) {
if (ClOpt && ClOptSameTemp) {
if (!TempsToInstrument.insert(Addr))
continue; // We've seen this temp in the current BB.
} else if (isa<MemIntrinsic>(BI) && ClMemIntrin) {
// ok, take it.
} else {
- if (isa<CallInst>(BI)) {
+ if (CallInst *CI = dyn_cast<CallInst>(BI)) {
// A call inside BB.
TempsToInstrument.clear();
+ if (CI->doesNotReturn()) {
+ NoReturnCalls.push_back(CI);
+ }
}
continue;
}
ToInstrument.push_back(BI);
+ NumInsnsPerBB++;
+ if (NumInsnsPerBB >= ClMaxInsnsToInstrumentPerBB)
+ break;
}
}
Instruction *Inst = ToInstrument[i];
if (ClDebugMin < 0 || ClDebugMax < 0 ||
(NumInstrumented >= ClDebugMin && NumInstrumented <= ClDebugMax)) {
- if (isa<StoreInst>(Inst) || isa<LoadInst>(Inst))
+ if (isInterestingMemoryAccess(Inst, &IsWrite))
instrumentMop(Inst);
else
instrumentMemIntrinsic(cast<MemIntrinsic>(Inst));
NumInstrumented++;
}
- DEBUG(dbgs() << F);
-
- bool ChangedStack = poisonStackInFunction(M, F);
+ bool ChangedStack = poisonStackInFunction(F);
- // For each NSObject descendant having a +load method, this method is invoked
- // by the ObjC runtime before any of the static constructors is called.
- // Therefore we need to instrument such methods with a call to __asan_init
- // at the beginning in order to initialize our runtime before any access to
- // the shadow memory.
- // We cannot just ignore these methods, because they may call other
- // instrumented functions.
- if (F.getName().find(" load]") != std::string::npos) {
- IRBuilder<> IRB(F.begin()->begin());
- IRB.CreateCall(AsanInitFunction);
+ // We must unpoison the stack before every NoReturn call (throw, _exit, etc).
+ // See e.g. http://code.google.com/p/address-sanitizer/issues/detail?id=37
+ for (size_t i = 0, n = NoReturnCalls.size(); i != n; i++) {
+ Instruction *CI = NoReturnCalls[i];
+ IRBuilder<> IRB(CI);
+ IRB.CreateCall(AsanHandleNoReturnFunc);
}
+ DEBUG(dbgs() << "ASAN done instrumenting:\n" << F << "\n");
- return NumInstrumented > 0 || ChangedStack;
+ return NumInstrumented > 0 || ChangedStack || !NoReturnCalls.empty();
}
static uint64_t ValueForPoison(uint64_t PoisonByte, size_t ShadowRedzoneSize) {
if (ShadowRedzoneSize == 4)
return (PoisonByte << 24) + (PoisonByte << 16) +
(PoisonByte << 8) + (PoisonByte);
- assert(0 && "ShadowRedzoneSize is either 1, 2 or 4");
- return 0;
+ llvm_unreachable("ShadowRedzoneSize is either 1, 2 or 4");
}
static void PoisonShadowPartialRightRedzone(uint8_t *Shadow,
// compiler hoists the load of the shadow value somewhere too high.
// This causes asan to report a non-existing bug on 453.povray.
// It sounds like an LLVM bug.
-bool AddressSanitizer::poisonStackInFunction(Module &M, Function &F) {
+bool AddressSanitizer::poisonStackInFunction(Function &F) {
if (!ClStack) return false;
SmallVector<AllocaInst*, 16> AllocaVec;
SmallVector<Instruction*, 8> RetVec;
Value *LocalStackBase = OrigStackBase;
if (DoStackMalloc) {
- Value *AsanStackMallocFunc = M.getOrInsertFunction(
- kAsanStackMallocName, IntptrTy, IntptrTy, IntptrTy, NULL);
LocalStackBase = IRB.CreateCall2(AsanStackMallocFunc,
ConstantInt::get(IntptrTy, LocalStackSize), OrigStackBase);
}
ConstantInt::get(IntptrTy, LongSize/8));
BasePlus1 = IRB.CreateIntToPtr(BasePlus1, IntptrPtrTy);
Value *Description = IRB.CreatePointerCast(
- createPrivateGlobalForString(M, StackDescription.str()),
+ createPrivateGlobalForString(*F.getParent(), StackDescription.str()),
IntptrTy);
IRB.CreateStore(Description, BasePlus1);
Value *ShadowBase = memToShadow(LocalStackBase, IRB);
PoisonStack(ArrayRef<AllocaInst*>(AllocaVec), IRB, ShadowBase, true);
- Value *AsanStackFreeFunc = NULL;
- if (DoStackMalloc) {
- AsanStackFreeFunc = M.getOrInsertFunction(
- kAsanStackFreeName, IRB.getVoidTy(),
- IntptrTy, IntptrTy, IntptrTy, NULL);
- }
-
// Unpoison the stack before all ret instructions.
for (size_t i = 0, n = RetVec.size(); i < n; i++) {
Instruction *Ret = RetVec[i];
}
}
+ // We are done. Remove the old unused alloca instructions.
+ for (size_t i = 0, n = AllocaVec.size(); i < n; i++)
+ AllocaVec[i]->eraseFromParent();
+
if (ClDebugStack) {
DEBUG(dbgs() << F);
}
return true;
}
-
-BlackList::BlackList(const std::string &Path) {
- Functions = NULL;
- const char *kFunPrefix = "fun:";
- if (!ClBlackListFile.size()) return;
- std::string Fun;
-
- OwningPtr<MemoryBuffer> File;
- if (error_code EC = MemoryBuffer::getFile(ClBlackListFile.c_str(), File)) {
- report_fatal_error("Can't open blacklist file " + ClBlackListFile + ": " +
- EC.message());
- }
- MemoryBuffer *Buff = File.take();
- const char *Data = Buff->getBufferStart();
- size_t DataLen = Buff->getBufferSize();
- SmallVector<StringRef, 16> Lines;
- SplitString(StringRef(Data, DataLen), Lines, "\n\r");
- for (size_t i = 0, numLines = Lines.size(); i < numLines; i++) {
- if (Lines[i].startswith(kFunPrefix)) {
- std::string ThisFunc = Lines[i].substr(strlen(kFunPrefix));
- std::string ThisFuncRE;
- // add ThisFunc replacing * with .*
- for (size_t j = 0, n = ThisFunc.size(); j < n; j++) {
- if (ThisFunc[j] == '*')
- ThisFuncRE += '.';
- ThisFuncRE += ThisFunc[j];
- }
- // Check that the regexp is valid.
- Regex CheckRE(ThisFuncRE);
- std::string Error;
- if (!CheckRE.isValid(Error))
- report_fatal_error("malformed blacklist regex: " + ThisFunc +
- ": " + Error);
- // Append to the final regexp.
- if (Fun.size())
- Fun += "|";
- Fun += ThisFuncRE;
- }
- }
- if (Fun.size()) {
- Functions = new Regex(Fun);
- }
-}
-
-bool BlackList::isIn(const Function &F) {
- if (Functions) {
- bool Res = Functions->match(F.getName());
- return Res;
- }
- return false;
-}
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