-//===-- CdsPass.cpp - xxx -------------------------------===//
-//
-// The LLVM Compiler Infrastructure
+//===-- CDSPass.cpp - xxx -------------------------------===//
//
+// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
+// See https://llvm.org/LICENSE.txt for license information.
+// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
#include "llvm/ADT/SmallString.h"
#include "llvm/Analysis/ValueTracking.h"
#include "llvm/Analysis/CaptureTracking.h"
+#include "llvm/Analysis/LoopInfo.h"
#include "llvm/IR/BasicBlock.h"
-#include "llvm/IR/CFG.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/IRBuilder.h"
#include "llvm/IR/Instructions.h"
+#include "llvm/IR/IntrinsicInst.h"
#include "llvm/IR/LLVMContext.h"
#include "llvm/IR/LegacyPassManager.h"
#include "llvm/IR/Module.h"
#include "llvm/Support/AtomicOrdering.h"
#include "llvm/Support/Debug.h"
#include "llvm/Transforms/Scalar.h"
-#include "llvm/Transforms/Utils/Local.h"
#include "llvm/Transforms/Utils/BasicBlockUtils.h"
+#include "llvm/Transforms/Utils/EscapeEnumerator.h"
#include "llvm/Transforms/IPO/PassManagerBuilder.h"
-#include <list>
#include <vector>
-// #include "llvm/Support/MathExtras.h"
-#define DEBUG_TYPE "CDS"
using namespace llvm;
-#define FUNCARRAYSIZE 4
+#define CDS_DEBUG
+#define DEBUG_TYPE "CDS"
+#include <llvm/IR/DebugLoc.h>
+
+static inline Value *getPosition( Instruction * I, IRBuilder <> IRB, bool print = false)
+{
+ const DebugLoc & debug_location = I->getDebugLoc ();
+ std::string position_string;
+ {
+ llvm::raw_string_ostream position_stream (position_string);
+ debug_location . print (position_stream);
+ }
+
+ if (print) {
+ errs() << position_string << "\n";
+ }
+
+ return IRB.CreateGlobalStringPtr (position_string);
+}
+
+static inline bool checkSignature(Function * func, Value * args[]) {
+ FunctionType * FType = func->getFunctionType();
+ for (unsigned i = 0 ; i < FType->getNumParams(); i++) {
+ if (FType->getParamType(i) != args[i]->getType()) {
+#ifdef CDS_DEBUG
+ errs() << "expects: " << *FType->getParamType(i)
+ << "\tbut receives: " << *args[i]->getType() << "\n";
+#endif
+ return false;
+ }
+ }
+
+ return true;
+}
STATISTIC(NumInstrumentedReads, "Number of instrumented reads");
STATISTIC(NumInstrumentedWrites, "Number of instrumented writes");
-// STATISTIC(NumInstrumentedVtableWrites, "Number of vtable ptr writes");
-// STATISTIC(NumInstrumentedVtableReads, "Number of vtable ptr reads");
-
STATISTIC(NumOmittedReadsBeforeWrite,
"Number of reads ignored due to following writes");
+STATISTIC(NumAccessesWithBadSize, "Number of accesses with bad size");
+// STATISTIC(NumInstrumentedVtableWrites, "Number of vtable ptr writes");
+// STATISTIC(NumInstrumentedVtableReads, "Number of vtable ptr reads");
STATISTIC(NumOmittedReadsFromConstantGlobals,
"Number of reads from constant globals");
STATISTIC(NumOmittedReadsFromVtable, "Number of vtable reads");
STATISTIC(NumOmittedNonCaptured, "Number of accesses ignored due to capturing");
-Type * Int8Ty;
-Type * Int16Ty;
-Type * Int32Ty;
-Type * Int64Ty;
-Type * OrdTy;
+// static const char *const kCDSModuleCtorName = "cds.module_ctor";
+// static const char *const kCDSInitName = "cds_init";
+Type * OrdTy;
+Type * IntPtrTy;
Type * Int8PtrTy;
Type * Int16PtrTy;
Type * Int32PtrTy;
Type * VoidTy;
-Constant * CdsLoad[FUNCARRAYSIZE];
-Constant * CdsStore[FUNCARRAYSIZE];
-Constant * CdsAtomicLoad[FUNCARRAYSIZE];
-Constant * CdsAtomicStore[FUNCARRAYSIZE];
-Constant * CdsAtomicRMW[AtomicRMWInst::LAST_BINOP + 1][FUNCARRAYSIZE];
-Constant * CdsAtomicCAS[FUNCARRAYSIZE];
-Constant * CdsAtomicThreadFence;
-
-int getAtomicOrderIndex(AtomicOrdering order){
- switch (order) {
- case AtomicOrdering::Monotonic:
- return (int)AtomicOrderingCABI::relaxed;
-// case AtomicOrdering::Consume: // not specified yet
-// return AtomicOrderingCABI::consume;
- case AtomicOrdering::Acquire:
- return (int)AtomicOrderingCABI::acquire;
- case AtomicOrdering::Release:
- return (int)AtomicOrderingCABI::release;
- case AtomicOrdering::AcquireRelease:
- return (int)AtomicOrderingCABI::acq_rel;
- case AtomicOrdering::SequentiallyConsistent:
- return (int)AtomicOrderingCABI::seq_cst;
- default:
- // unordered or Not Atomic
- return -1;
- }
+static const size_t kNumberOfAccessSizes = 4;
+
+int getAtomicOrderIndex(AtomicOrdering order) {
+ switch (order) {
+ case AtomicOrdering::Monotonic:
+ return (int)AtomicOrderingCABI::relaxed;
+ //case AtomicOrdering::Consume: // not specified yet
+ // return AtomicOrderingCABI::consume;
+ case AtomicOrdering::Acquire:
+ return (int)AtomicOrderingCABI::acquire;
+ case AtomicOrdering::Release:
+ return (int)AtomicOrderingCABI::release;
+ case AtomicOrdering::AcquireRelease:
+ return (int)AtomicOrderingCABI::acq_rel;
+ case AtomicOrdering::SequentiallyConsistent:
+ return (int)AtomicOrderingCABI::seq_cst;
+ default:
+ // unordered or Not Atomic
+ return -1;
+ }
}
-int getTypeSize(Type* type) {
- if (type==Int32PtrTy) {
- return sizeof(int)*8;
- } else if (type==Int8PtrTy) {
- return sizeof(char)*8;
- } else if (type==Int16PtrTy) {
- return sizeof(short)*8;
- } else if (type==Int64PtrTy) {
- return sizeof(long long int)*8;
- } else {
- return sizeof(void*)*8;
- }
-
- return -1;
+AtomicOrderingCABI indexToAtomicOrder(int index) {
+ switch (index) {
+ case 0:
+ return AtomicOrderingCABI::relaxed;
+ case 1:
+ return AtomicOrderingCABI::consume;
+ case 2:
+ return AtomicOrderingCABI::acquire;
+ case 3:
+ return AtomicOrderingCABI::release;
+ case 4:
+ return AtomicOrderingCABI::acq_rel;
+ case 5:
+ return AtomicOrderingCABI::seq_cst;
+ default:
+ errs() << "Bad Atomic index\n";
+ return AtomicOrderingCABI::seq_cst;
+ }
}
-static int sizetoindex(int size) {
- switch(size) {
- case 8: return 0;
- case 16: return 1;
- case 32: return 2;
- case 64: return 3;
- }
- return -1;
+/* According to atomic_base.h: __cmpexch_failure_order */
+int AtomicCasFailureOrderIndex(int index) {
+ AtomicOrderingCABI succ_order = indexToAtomicOrder(index);
+ AtomicOrderingCABI fail_order;
+ if (succ_order == AtomicOrderingCABI::acq_rel)
+ fail_order = AtomicOrderingCABI::acquire;
+ else if (succ_order == AtomicOrderingCABI::release)
+ fail_order = AtomicOrderingCABI::relaxed;
+ else
+ fail_order = succ_order;
+
+ return (int) fail_order;
+}
+
+/* The original function checkSanitizerInterfaceFunction was defined
+ * in llvm/Transforms/Utils/ModuleUtils.h
+ */
+static Function * checkCDSPassInterfaceFunction(Constant *FuncOrBitcast) {
+ if (isa<Function>(FuncOrBitcast))
+ return cast<Function>(FuncOrBitcast);
+ FuncOrBitcast->print(errs());
+ errs() << "\n";
+ std::string Err;
+ raw_string_ostream Stream(Err);
+ Stream << "CDSPass interface function redefined: " << *FuncOrBitcast;
+ report_fatal_error(Err);
}
namespace {
- struct CdsPass : public FunctionPass {
- static char ID;
- CdsPass() : FunctionPass(ID) {}
- bool runOnFunction(Function &F) override;
-
- private:
- void initializeCallbacks(Module &M);
- bool instrumentLoadOrStore(Instruction *I, const DataLayout &DL);
- bool instrumentAtomic(Instruction *I);
- void chooseInstructionsToInstrument(SmallVectorImpl<Instruction *> &Local,
- SmallVectorImpl<Instruction *> &All,
- const DataLayout &DL);
- bool addrPointsToConstantData(Value *Addr);
- };
+ struct CDSPass : public FunctionPass {
+ CDSPass() : FunctionPass(ID) {}
+ StringRef getPassName() const override;
+ bool runOnFunction(Function &F) override;
+ bool doInitialization(Module &M) override;
+ static char ID;
+
+ private:
+ void initializeCallbacks(Module &M);
+ bool instrumentLoadOrStore(Instruction *I, const DataLayout &DL);
+ bool instrumentVolatile(Instruction *I, const DataLayout &DL);
+ bool instrumentMemIntrinsic(Instruction *I);
+ bool instrumentAtomic(Instruction *I, const DataLayout &DL);
+ bool shouldInstrumentBeforeAtomics(Instruction *I);
+ void chooseInstructionsToInstrument(SmallVectorImpl<Instruction *> &Local,
+ SmallVectorImpl<Instruction *> &All,
+ const DataLayout &DL);
+ bool addrPointsToConstantData(Value *Addr);
+ int getMemoryAccessFuncIndex(Value *Addr, const DataLayout &DL);
+
+ Function * CDSFuncEntry;
+ Function * CDSFuncExit;
+
+ Function * CDSLoad[kNumberOfAccessSizes];
+ Function * CDSStore[kNumberOfAccessSizes];
+ Function * CDSVolatileLoad[kNumberOfAccessSizes];
+ Function * CDSVolatileStore[kNumberOfAccessSizes];
+ Function * CDSAtomicInit[kNumberOfAccessSizes];
+ Function * CDSAtomicLoad[kNumberOfAccessSizes];
+ Function * CDSAtomicStore[kNumberOfAccessSizes];
+ Function * CDSAtomicRMW[AtomicRMWInst::LAST_BINOP + 1][kNumberOfAccessSizes];
+ Function * CDSAtomicCAS_V1[kNumberOfAccessSizes];
+ Function * CDSAtomicCAS_V2[kNumberOfAccessSizes];
+ Function * CDSAtomicThreadFence;
+ Function * MemmoveFn, * MemcpyFn, * MemsetFn;
+ // Function * CDSCtorFunction;
+
+ std::vector<StringRef> AtomicFuncNames;
+ std::vector<StringRef> PartialAtomicFuncNames;
+ };
+}
+
+StringRef CDSPass::getPassName() const {
+ return "CDSPass";
}
-void CdsPass::initializeCallbacks(Module &M) {
- LLVMContext &Ctx = M.getContext();
-
- Int8Ty = Type::getInt8Ty(Ctx);
- Int16Ty = Type::getInt16Ty(Ctx);
- Int32Ty = Type::getInt32Ty(Ctx);
- Int64Ty = Type::getInt64Ty(Ctx);
- OrdTy = Type::getInt32Ty(Ctx);
-
- Int8PtrTy = Type::getInt8PtrTy(Ctx);
- Int16PtrTy = Type::getInt16PtrTy(Ctx);
- Int32PtrTy = Type::getInt32PtrTy(Ctx);
- Int64PtrTy = Type::getInt64PtrTy(Ctx);
-
- VoidTy = Type::getVoidTy(Ctx);
-
-
- // Get the function to call from our untime library.
- for (unsigned i = 0; i < FUNCARRAYSIZE; i++) {
- const unsigned ByteSize = 1U << i;
- const unsigned BitSize = ByteSize * 8;
-// errs() << BitSize << "\n";
- std::string ByteSizeStr = utostr(ByteSize);
- std::string BitSizeStr = utostr(BitSize);
-
- Type *Ty = Type::getIntNTy(Ctx, BitSize);
- Type *PtrTy = Ty->getPointerTo();
-
- // uint8_t cds_atomic_load8 (void * obj, int atomic_index)
- // void cds_atomic_store8 (void * obj, int atomic_index, uint8_t val)
- SmallString<32> LoadName("cds_load" + BitSizeStr);
- SmallString<32> StoreName("cds_store" + BitSizeStr);
- SmallString<32> AtomicLoadName("cds_atomic_load" + BitSizeStr);
- SmallString<32> AtomicStoreName("cds_atomic_store" + BitSizeStr);
-
-// CdsLoad[i] = M.getOrInsertFunction(LoadName, Ty, PtrTy);
-// CdsStore[i] = M.getOrInsertFunction(StoreName, VoidTy, PtrTy, Ty);
- CdsLoad[i] = M.getOrInsertFunction(LoadName, VoidTy, PtrTy);
- CdsStore[i] = M.getOrInsertFunction(StoreName, VoidTy, PtrTy);
- CdsAtomicLoad[i] = M.getOrInsertFunction(AtomicLoadName, Ty, PtrTy, OrdTy);
- CdsAtomicStore[i] = M.getOrInsertFunction(AtomicStoreName, VoidTy, PtrTy, OrdTy, Ty);
-
- for (int op = AtomicRMWInst::FIRST_BINOP; op <= AtomicRMWInst::LAST_BINOP; ++op) {
- CdsAtomicRMW[op][i] = nullptr;
- std::string NamePart;
-
- if (op == AtomicRMWInst::Xchg)
- NamePart = "_exchange";
- else if (op == AtomicRMWInst::Add)
- NamePart = "_fetch_add";
- else if (op == AtomicRMWInst::Sub)
- NamePart = "_fetch_sub";
- else if (op == AtomicRMWInst::And)
- NamePart = "_fetch_and";
- else if (op == AtomicRMWInst::Or)
- NamePart = "_fetch_or";
- else if (op == AtomicRMWInst::Xor)
- NamePart = "_fetch_xor";
- else
- continue;
-
- SmallString<32> AtomicRMWName("cds_atomic" + NamePart + BitSizeStr);
- CdsAtomicRMW[op][i] = M.getOrInsertFunction(AtomicRMWName, Ty, PtrTy, OrdTy, Ty);
- }
-
- // only supportes strong version
- SmallString<32> AtomicCASName("cds_atomic_compare_exchange" + BitSizeStr);
- CdsAtomicCAS[i] = M.getOrInsertFunction(AtomicCASName, Ty, PtrTy, Ty, Ty, OrdTy, OrdTy);
- }
-
- CdsAtomicThreadFence = M.getOrInsertFunction("cds_atomic_thread_fence", VoidTy, OrdTy);
+void CDSPass::initializeCallbacks(Module &M) {
+ LLVMContext &Ctx = M.getContext();
+ AttributeList Attr;
+ Attr = Attr.addAttribute(Ctx, AttributeList::FunctionIndex,
+ Attribute::NoUnwind);
+
+ Type * Int1Ty = Type::getInt1Ty(Ctx);
+ Type * Int32Ty = Type::getInt32Ty(Ctx);
+ OrdTy = Type::getInt32Ty(Ctx);
+
+ Int8PtrTy = Type::getInt8PtrTy(Ctx);
+ Int16PtrTy = Type::getInt16PtrTy(Ctx);
+ Int32PtrTy = Type::getInt32PtrTy(Ctx);
+ Int64PtrTy = Type::getInt64PtrTy(Ctx);
+
+ VoidTy = Type::getVoidTy(Ctx);
+
+ CDSFuncEntry = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction("cds_func_entry",
+ Attr, VoidTy, Int8PtrTy));
+ CDSFuncExit = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction("cds_func_exit",
+ Attr, VoidTy, Int8PtrTy));
+
+ // Get the function to call from our untime library.
+ for (unsigned i = 0; i < kNumberOfAccessSizes; i++) {
+ const unsigned ByteSize = 1U << i;
+ const unsigned BitSize = ByteSize * 8;
+
+ std::string ByteSizeStr = utostr(ByteSize);
+ std::string BitSizeStr = utostr(BitSize);
+
+ Type *Ty = Type::getIntNTy(Ctx, BitSize);
+ Type *PtrTy = Ty->getPointerTo();
+
+ // uint8_t cds_atomic_load8 (void * obj, int atomic_index)
+ // void cds_atomic_store8 (void * obj, int atomic_index, uint8_t val)
+ SmallString<32> LoadName("cds_load" + BitSizeStr);
+ SmallString<32> StoreName("cds_store" + BitSizeStr);
+ SmallString<32> VolatileLoadName("cds_volatile_load" + BitSizeStr);
+ SmallString<32> VolatileStoreName("cds_volatile_store" + BitSizeStr);
+ SmallString<32> AtomicInitName("cds_atomic_init" + BitSizeStr);
+ SmallString<32> AtomicLoadName("cds_atomic_load" + BitSizeStr);
+ SmallString<32> AtomicStoreName("cds_atomic_store" + BitSizeStr);
+
+ CDSLoad[i] = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction(LoadName, Attr, VoidTy, Int8PtrTy));
+ CDSStore[i] = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction(StoreName, Attr, VoidTy, Int8PtrTy));
+ CDSVolatileLoad[i] = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction(VolatileLoadName,
+ Attr, Ty, PtrTy, Int8PtrTy));
+ CDSVolatileStore[i] = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction(VolatileStoreName,
+ Attr, VoidTy, PtrTy, Ty, Int8PtrTy));
+ CDSAtomicInit[i] = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction(AtomicInitName,
+ Attr, VoidTy, PtrTy, Ty, Int8PtrTy));
+ CDSAtomicLoad[i] = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction(AtomicLoadName,
+ Attr, Ty, PtrTy, OrdTy, Int8PtrTy));
+ CDSAtomicStore[i] = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction(AtomicStoreName,
+ Attr, VoidTy, PtrTy, Ty, OrdTy, Int8PtrTy));
+
+ for (int op = AtomicRMWInst::FIRST_BINOP;
+ op <= AtomicRMWInst::LAST_BINOP; ++op) {
+ CDSAtomicRMW[op][i] = nullptr;
+ std::string NamePart;
+
+ if (op == AtomicRMWInst::Xchg)
+ NamePart = "_exchange";
+ else if (op == AtomicRMWInst::Add)
+ NamePart = "_fetch_add";
+ else if (op == AtomicRMWInst::Sub)
+ NamePart = "_fetch_sub";
+ else if (op == AtomicRMWInst::And)
+ NamePart = "_fetch_and";
+ else if (op == AtomicRMWInst::Or)
+ NamePart = "_fetch_or";
+ else if (op == AtomicRMWInst::Xor)
+ NamePart = "_fetch_xor";
+ else
+ continue;
+
+ SmallString<32> AtomicRMWName("cds_atomic" + NamePart + BitSizeStr);
+ CDSAtomicRMW[op][i] = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction(AtomicRMWName,
+ Attr, Ty, PtrTy, Ty, OrdTy, Int8PtrTy));
+ }
+
+ // only supportes strong version
+ SmallString<32> AtomicCASName_V1("cds_atomic_compare_exchange" + BitSizeStr + "_v1");
+ SmallString<32> AtomicCASName_V2("cds_atomic_compare_exchange" + BitSizeStr + "_v2");
+ CDSAtomicCAS_V1[i] = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction(AtomicCASName_V1,
+ Attr, Ty, PtrTy, Ty, Ty, OrdTy, OrdTy, Int8PtrTy));
+ CDSAtomicCAS_V2[i] = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction(AtomicCASName_V2,
+ Attr, Int1Ty, PtrTy, PtrTy, Ty, OrdTy, OrdTy, Int8PtrTy));
+ }
+
+ CDSAtomicThreadFence = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction("cds_atomic_thread_fence", Attr, VoidTy, OrdTy, Int8PtrTy));
+
+ MemmoveFn = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction("memmove", Attr, Int8PtrTy, Int8PtrTy,
+ Int8PtrTy, IntPtrTy));
+ MemcpyFn = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction("memcpy", Attr, Int8PtrTy, Int8PtrTy,
+ Int8PtrTy, IntPtrTy));
+ MemsetFn = checkCDSPassInterfaceFunction(
+ M.getOrInsertFunction("memset", Attr, Int8PtrTy, Int8PtrTy,
+ Int32Ty, IntPtrTy));
+}
+
+bool CDSPass::doInitialization(Module &M) {
+ const DataLayout &DL = M.getDataLayout();
+ IntPtrTy = DL.getIntPtrType(M.getContext());
+
+ // createSanitizerCtorAndInitFunctions is defined in "llvm/Transforms/Utils/ModuleUtils.h"
+ // We do not support it yet
+ /*
+ std::tie(CDSCtorFunction, std::ignore) = createSanitizerCtorAndInitFunctions(
+ M, kCDSModuleCtorName, kCDSInitName, {}, {});
+
+ appendToGlobalCtors(M, CDSCtorFunction, 0);
+ */
+
+ AtomicFuncNames =
+ {
+ "atomic_init", "atomic_load", "atomic_store",
+ "atomic_fetch_", "atomic_exchange", "atomic_compare_exchange_"
+ };
+
+ PartialAtomicFuncNames =
+ {
+ "load", "store", "fetch", "exchange", "compare_exchange_"
+ };
+
+ return true;
}
static bool isVtableAccess(Instruction *I) {
- if (MDNode *Tag = I->getMetadata(LLVMContext::MD_tbaa))
- return Tag->isTBAAVtableAccess();
- return false;
+ if (MDNode *Tag = I->getMetadata(LLVMContext::MD_tbaa))
+ return Tag->isTBAAVtableAccess();
+ return false;
}
+// Do not instrument known races/"benign races" that come from compiler
+// instrumentatin. The user has no way of suppressing them.
static bool shouldInstrumentReadWriteFromAddress(const Module *M, Value *Addr) {
- // Peel off GEPs and BitCasts.
- Addr = Addr->stripInBoundsOffsets();
-
- if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Addr)) {
- if (GV->hasSection()) {
- StringRef SectionName = GV->getSection();
- // Check if the global is in the PGO counters section.
- auto OF = Triple(M->getTargetTriple()).getObjectFormat();
- if (SectionName.endswith(
- getInstrProfSectionName(IPSK_cnts, OF, /*AddSegmentInfo=*/false)))
- return false;
- }
-
- // Check if the global is private gcov data.
- if (GV->getName().startswith("__llvm_gcov") ||
- GV->getName().startswith("__llvm_gcda"))
- return false;
- }
-
- // Do not instrument acesses from different address spaces; we cannot deal
- // with them.
- if (Addr) {
- Type *PtrTy = cast<PointerType>(Addr->getType()->getScalarType());
- if (PtrTy->getPointerAddressSpace() != 0)
- return false;
- }
-
- return true;
+ // Peel off GEPs and BitCasts.
+ Addr = Addr->stripInBoundsOffsets();
+
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Addr)) {
+ if (GV->hasSection()) {
+ StringRef SectionName = GV->getSection();
+ // Check if the global is in the PGO counters section.
+ auto OF = Triple(M->getTargetTriple()).getObjectFormat();
+ if (SectionName.endswith(
+ getInstrProfSectionName(IPSK_cnts, OF, /*AddSegmentInfo=*/false)))
+ return false;
+ }
+
+ // Check if the global is private gcov data.
+ if (GV->getName().startswith("__llvm_gcov") ||
+ GV->getName().startswith("__llvm_gcda"))
+ return false;
+ }
+
+ // Do not instrument acesses from different address spaces; we cannot deal
+ // with them.
+ if (Addr) {
+
Type *PtrTy = cast<PointerType>(Addr->getType()->getScalarType());
+ if (PtrTy->getPointerAddressSpace() != 0)
+ return false;
+ }
+
+ return true;
}
-bool CdsPass::addrPointsToConstantData(Value *Addr) {
- // If this is a GEP, just analyze its pointer operand.
- if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Addr))
- Addr = GEP->getPointerOperand();
-
- if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Addr)) {
- if (GV->isConstant()) {
- // Reads from constant globals can not race with any writes.
- NumOmittedReadsFromConstantGlobals++;
- return true;
- }
- } else if (LoadInst *L = dyn_cast<LoadInst>(Addr)) {
- if (isVtableAccess(L)) {
- // Reads from a vtable pointer can not race with any writes.
- NumOmittedReadsFromVtable++;
- return true;
- }
- }
- return false;
+bool CDSPass::addrPointsToConstantData(Value *Addr) {
+ // If this is a GEP, just analyze its pointer operand.
+ if (GetElementPtrInst *GEP = dyn_cast<GetElementPtrInst>(Addr))
+ Addr = GEP->getPointerOperand();
+
+ if (GlobalVariable *GV = dyn_cast<GlobalVariable>(Addr)) {
+ if (GV->isConstant()) {
+ // Reads from constant globals can not race with any writes.
+ NumOmittedReadsFromConstantGlobals++;
+ return true;
+ }
+ } else if (LoadInst *L = dyn_cast<LoadInst>(Addr)) {
+ if (isVtableAccess(L)) {
+ // Reads from a vtable pointer can not race with any writes.
+ NumOmittedReadsFromVtable++;
+ return true;
+ }
+ }
+ return false;
}
-bool CdsPass::runOnFunction(Function &F) {
- if (F.getName() == "main")
- F.setName("user_main");
-
- initializeCallbacks( *F.getParent() );
-
- SmallVector<Instruction*, 8> AllLoadsAndStores;
- SmallVector<Instruction*, 8> LocalLoadsAndStores;
- SmallVector<Instruction*, 8> AtomicAccesses;
-
- std::vector<Instruction *> worklist;
-
- bool Res = false;
- const DataLayout &DL = F.getParent()->getDataLayout();
-
- errs() << "Before\n";
- F.dump();
-
- for (auto &B : F) {
- for (auto &I : B) {
- if ( (&I)->isAtomic() ) {
- AtomicAccesses.push_back(&I);
- } else if (isa<LoadInst>(I) || isa<StoreInst>(I)) {
- LocalLoadsAndStores.push_back(&I);
- }
- }
- chooseInstructionsToInstrument(LocalLoadsAndStores, AllLoadsAndStores, DL);
- }
-
- for (auto Inst : AllLoadsAndStores) {
- Res |= instrumentLoadOrStore(Inst, DL);
- }
-
- for (auto Inst : AtomicAccesses) {
- Res |= instrumentAtomic(Inst);
- }
-
- errs() << "After\n";
- F.dump();
-
- return false;
+bool CDSPass::shouldInstrumentBeforeAtomics(Instruction * Inst) {
+ if (LoadInst *LI = dyn_cast<LoadInst>(Inst)) {
+ AtomicOrdering ordering = LI->getOrdering();
+ if ( isAtLeastOrStrongerThan(ordering, AtomicOrdering::Acquire) )
+ return true;
+ } else if (StoreInst *SI = dyn_cast<StoreInst>(Inst)) {
+ AtomicOrdering ordering = SI->getOrdering();
+ if ( isAtLeastOrStrongerThan(ordering, AtomicOrdering::Acquire) )
+ return true;
+ } else if (AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(Inst)) {
+ AtomicOrdering ordering = RMWI->getOrdering();
+ if ( isAtLeastOrStrongerThan(ordering, AtomicOrdering::Acquire) )
+ return true;
+ } else if (AtomicCmpXchgInst *CASI = dyn_cast<AtomicCmpXchgInst>(Inst)) {
+ AtomicOrdering ordering = CASI->getSuccessOrdering();
+ if ( isAtLeastOrStrongerThan(ordering, AtomicOrdering::Acquire) )
+ return true;
+ } else if (FenceInst *FI = dyn_cast<FenceInst>(Inst)) {
+ AtomicOrdering ordering = FI->getOrdering();
+ if ( isAtLeastOrStrongerThan(ordering, AtomicOrdering::Acquire) )
+ return true;
+ }
+
+ return false;
}
-void CdsPass::chooseInstructionsToInstrument(
- SmallVectorImpl<Instruction *> &Local, SmallVectorImpl<Instruction *> &All,
- const DataLayout &DL) {
- SmallPtrSet<Value*, 8> WriteTargets;
- // Iterate from the end.
- for (Instruction *I : reverse(Local)) {
- if (StoreInst *Store = dyn_cast<StoreInst>(I)) {
- Value *Addr = Store->getPointerOperand();
- if (!shouldInstrumentReadWriteFromAddress(I->getModule(), Addr))
- continue;
- WriteTargets.insert(Addr);
- } else {
- LoadInst *Load = cast<LoadInst>(I);
- Value *Addr = Load->getPointerOperand();
- if (!shouldInstrumentReadWriteFromAddress(I->getModule(), Addr))
- continue;
- if (WriteTargets.count(Addr)) {
- // We will write to this temp, so no reason to analyze the read.
- NumOmittedReadsBeforeWrite++;
- continue;
- }
- if (addrPointsToConstantData(Addr)) {
- // Addr points to some constant data -- it can not race with any writes.
- continue;
- }
- }
- Value *Addr = isa<StoreInst>(*I)
- ? cast<StoreInst>(I)->getPointerOperand()
- : cast<LoadInst>(I)->getPointerOperand();
- if (isa<AllocaInst>(GetUnderlyingObject(Addr, DL)) &&
- !PointerMayBeCaptured(Addr, true, true)) {
- // The variable is addressable but not captured, so it cannot be
- // referenced from a different thread and participate in a data race
- // (see llvm/Analysis/CaptureTracking.h for details).
- NumOmittedNonCaptured++;
- continue;
- }
- All.push_back(I);
- }
- Local.clear();
+void CDSPass::chooseInstructionsToInstrument(
+ SmallVectorImpl<Instruction *> &Local, SmallVectorImpl<Instruction *> &All,
+ const DataLayout &DL) {
+ SmallPtrSet<Value*, 8> WriteTargets;
+ // Iterate from the end.
+ for (Instruction *I : reverse(Local)) {
+ if (StoreInst *Store = dyn_cast<StoreInst>(I)) {
+ Value *Addr = Store->getPointerOperand();
+ if (!shouldInstrumentReadWriteFromAddress(I->getModule(), Addr))
+ continue;
+ WriteTargets.insert(Addr);
+ } else {
+ LoadInst *Load = cast<LoadInst>(I);
+ Value *Addr = Load->getPointerOperand();
+ if (!shouldInstrumentReadWriteFromAddress(I->getModule(), Addr))
+ continue;
+ if (WriteTargets.count(Addr)) {
+ // We will write to this temp, so no reason to analyze the read.
+ NumOmittedReadsBeforeWrite++;
+ continue;
+ }
+ if (addrPointsToConstantData(Addr)) {
+ // Addr points to some constant data -- it can not race with any writes.
+ continue;
+ }
+ }
+ Value *Addr = isa<StoreInst>(*I)
+ ? cast<StoreInst>(I)->getPointerOperand()
+ : cast<LoadInst>(I)->getPointerOperand();
+
if (isa<AllocaInst>(GetUnderlyingObject(Addr, DL)) &&
+ !PointerMayBeCaptured(Addr, true, true)) {
+ // The variable is addressable but not captured, so it cannot be
+ // referenced from a different thread and participate in a data race
+ // (see llvm/Analysis/CaptureTracking.h for details).
+ NumOmittedNonCaptured++;
+ continue;
+ }
+ All.push_back(I);
+ }
+ Local.clear();
}
+/* Not implemented
+void CDSPass::InsertRuntimeIgnores(Function &F) {
+ IRBuilder<> IRB(F.getEntryBlock().getFirstNonPHI());
+ IRB.CreateCall(CDSIgnoreBegin);
+ EscapeEnumerator EE(F, "cds_ignore_cleanup", ClHandleCxxExceptions);
+ while (IRBuilder<> *AtExit = EE.Next()) {
+ AtExit->CreateCall(CDSIgnoreEnd);
+ }
+}*/
+
+bool CDSPass::runOnFunction(Function &F) {
+ initializeCallbacks( *F.getParent() );
+ SmallVector<Instruction*, 8> AllLoadsAndStores;
+ SmallVector<Instruction*, 8> LocalLoadsAndStores;
+ SmallVector<Instruction*, 8> VolatileLoadsAndStores;
+ SmallVector<Instruction*, 8> AtomicAccesses;
+ SmallVector<Instruction*, 8> MemIntrinCalls;
+
+ bool Res = false;
+ bool HasAtomic = false;
+ bool HasVolatile = false;
+ const DataLayout &DL = F.getParent()->getDataLayout();
+
+ for (auto &BB : F) {
+ for (auto &Inst : BB) {
+ if ( (&Inst)->isAtomic() ) {
+ AtomicAccesses.push_back(&Inst);
+ HasAtomic = true;
+
+ if (shouldInstrumentBeforeAtomics(&Inst)) {
+ chooseInstructionsToInstrument(LocalLoadsAndStores, AllLoadsAndStores,
+ DL);
+ }
+ } else if (isa<LoadInst>(Inst) || isa<StoreInst>(Inst)) {
+ LoadInst *LI = dyn_cast<LoadInst>(&Inst);
+ StoreInst *SI = dyn_cast<StoreInst>(&Inst);
+ bool isVolatile = ( LI ? LI->isVolatile() : SI->isVolatile() );
+
+ if (isVolatile) {
+ VolatileLoadsAndStores.push_back(&Inst);
+ HasVolatile = true;
+ } else
+ LocalLoadsAndStores.push_back(&Inst);
+ } else if (isa<CallInst>(Inst) || isa<InvokeInst>(Inst)) {
+ if (isa<MemIntrinsic>(Inst))
+ MemIntrinCalls.push_back(&Inst);
+
+ /*if (CallInst *CI = dyn_cast<CallInst>(&Inst))
+ maybeMarkSanitizerLibraryCallNoBuiltin(CI, TLI);
+ */
+
+ chooseInstructionsToInstrument(LocalLoadsAndStores, AllLoadsAndStores,
+ DL);
+ }
+ }
+
+ chooseInstructionsToInstrument(LocalLoadsAndStores, AllLoadsAndStores, DL);
+ }
+
+ for (auto Inst : AllLoadsAndStores) {
+ Res |= instrumentLoadOrStore(Inst, DL);
+ }
+
+ for (auto Inst : VolatileLoadsAndStores) {
+ Res |= instrumentVolatile(Inst, DL);
+ }
+
+ for (auto Inst : AtomicAccesses) {
+ Res |= instrumentAtomic(Inst, DL);
+ }
+
+ for (auto Inst : MemIntrinCalls) {
+ Res |= instrumentMemIntrinsic(Inst);
+ }
+
+ // Instrument function entry and exit for functions containing atomics or volatiles
+ if (Res && ( HasAtomic || HasVolatile) ) {
+ IRBuilder<> IRB(F.getEntryBlock().getFirstNonPHI());
+ /* Unused for now
+ Value *ReturnAddress = IRB.CreateCall(
+ Intrinsic::getDeclaration(F.getParent(), Intrinsic::returnaddress),
+ IRB.getInt32(0));
+ */
+
+ Value * FuncName = IRB.CreateGlobalStringPtr(F.getName());
+ IRB.CreateCall(CDSFuncEntry, FuncName);
+
+ EscapeEnumerator EE(F, "cds_cleanup", true);
+ while (IRBuilder<> *AtExit = EE.Next()) {
+ AtExit->CreateCall(CDSFuncExit, FuncName);
+ }
+
+ Res = true;
+ }
+
+ return false;
+}
-bool CdsPass::instrumentLoadOrStore(Instruction *I,
- const DataLayout &DL) {
- IRBuilder<> IRB(I);
- bool IsWrite = isa<StoreInst>(*I);
- Value *Addr = IsWrite
- ? cast<StoreInst>(I)->getPointerOperand()
- : cast<LoadInst>(I)->getPointerOperand();
-
- // swifterror memory addresses are mem2reg promoted by instruction selection.
- // As such they cannot have regular uses like an instrumentation function and
- // it makes no sense to track them as memory.
- if (Addr->isSwiftError())
- return false;
-
- int size = getTypeSize(Addr->getType());
- int index = sizetoindex(size);
-
-// not supported by Cds yet
-/* if (IsWrite && isVtableAccess(I)) {
- LLVM_DEBUG(dbgs() << " VPTR : " << *I << "\n");
- Value *StoredValue = cast<StoreInst>(I)->getValueOperand();
- // StoredValue may be a vector type if we are storing several vptrs at once.
- // In this case, just take the first element of the vector since this is
- // enough to find vptr races.
- if (isa<VectorType>(StoredValue->getType()))
- StoredValue = IRB.CreateExtractElement(
- StoredValue, ConstantInt::get(IRB.getInt32Ty(), 0));
- if (StoredValue->getType()->isIntegerTy())
- StoredValue = IRB.CreateIntToPtr(StoredValue, IRB.getInt8PtrTy());
- // Call TsanVptrUpdate.
- IRB.CreateCall(TsanVptrUpdate,
- {IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()),
- IRB.CreatePointerCast(StoredValue, IRB.getInt8PtrTy())});
- NumInstrumentedVtableWrites++;
- return true;
- }
-
- if (!IsWrite && isVtableAccess(I)) {
- IRB.CreateCall(TsanVptrLoad,
- IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()));
- NumInstrumentedVtableReads++;
- return true;
- }
-*/
-
- Value *OnAccessFunc = nullptr;
- OnAccessFunc = IsWrite ? CdsStore[index] : CdsLoad[index];
-
- IRB.CreateCall(OnAccessFunc, IRB.CreatePointerCast(Addr, Addr->getType()));
- if (IsWrite) NumInstrumentedWrites++;
- else NumInstrumentedReads++;
- return true;
+bool CDSPass::instrumentLoadOrStore(Instruction *I,
+ const DataLayout &DL) {
+ IRBuilder<> IRB(I);
+ bool IsWrite = isa<StoreInst>(*I);
+ Value *Addr = IsWrite
+ ? cast<StoreInst>(I)->getPointerOperand()
+ : cast<LoadInst>(I)->getPointerOperand();
+
+ // swifterror memory addresses are mem2reg promoted by instruction selection.
+ // As such they cannot have regular uses like an instrumentation function and
+ // it makes no sense to track them as memory.
+ if (Addr->isSwiftError())
+ return false;
+
+ int Idx = getMemoryAccessFuncIndex(Addr, DL);
+ if (Idx < 0)
+ return false;
+
+ if (IsWrite && isVtableAccess(I)) {
+ /* TODO
+ LLVM_DEBUG(dbgs() << " VPTR : " << *I << "\n");
+ Value *StoredValue = cast<StoreInst>(I)->getValueOperand();
+ // StoredValue may be a vector type if we are storing several vptrs at once.
+ // In this case, just take the first element of the vector since this is
+ // enough to find vptr races.
+ if (isa<VectorType>(StoredValue->getType()))
+ StoredValue = IRB.CreateExtractElement(
+ StoredValue, ConstantInt::get(IRB.getInt32Ty(), 0));
+ if (StoredValue->getType()->isIntegerTy())
+ StoredValue = IRB.CreateIntToPtr(StoredValue, IRB.getInt8PtrTy());
+ // Call TsanVptrUpdate.
+ IRB.CreateCall(TsanVptrUpdate,
+ {IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()),
+ IRB.CreatePointerCast(StoredValue, IRB.getInt8PtrTy())});
+ NumInstrumentedVtableWrites++;
+ */
+ return true;
+ }
+
+ if (!IsWrite && isVtableAccess(I)) {
+ /* TODO
+ IRB.CreateCall(TsanVptrLoad,
+ IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()));
+ NumInstrumentedVtableReads++;
+ */
+ return true;
+ }
+
+ // TODO: unaligned reads and writes
+ Value *OnAccessFunc = nullptr;
+ OnAccessFunc = IsWrite ? CDSStore[Idx] : CDSLoad[Idx];
+ IRB.CreateCall(OnAccessFunc, IRB.CreatePointerCast(Addr, IRB.getInt8PtrTy()));
+ if (IsWrite) NumInstrumentedWrites++;
+ else NumInstrumentedReads++;
+ return true;
}
+bool CDSPass::instrumentVolatile(Instruction * I, const DataLayout &DL) {
+ IRBuilder<> IRB(I);
+ Value *position = getPosition(I, IRB);
+
+ if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
+ Value *Addr = LI->getPointerOperand();
+ int Idx=getMemoryAccessFuncIndex(Addr, DL);
+ if (Idx < 0)
+ return false;
+ const unsigned ByteSize = 1U << Idx;
+ const unsigned BitSize = ByteSize * 8;
+ Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize);
+ Type *PtrTy = Ty->getPointerTo();
+ Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy), position};
+
+ Type *OrigTy = cast<PointerType>(Addr->getType())->getElementType();
+ Value *C = IRB.CreateCall(CDSVolatileLoad[Idx], Args);
+ Value *Cast = IRB.CreateBitOrPointerCast(C, OrigTy);
+ I->replaceAllUsesWith(Cast);
+ } else if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
+ Value *Addr = SI->getPointerOperand();
+ int Idx=getMemoryAccessFuncIndex(Addr, DL);
+ if (Idx < 0)
+ return false;
+ const unsigned ByteSize = 1U << Idx;
+ const unsigned BitSize = ByteSize * 8;
+ Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize);
+ Type *PtrTy = Ty->getPointerTo();
+ Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy),
+ IRB.CreateBitOrPointerCast(SI->getValueOperand(), Ty),
+ position};
+ CallInst *C = CallInst::Create(CDSVolatileStore[Idx], Args);
+ ReplaceInstWithInst(I, C);
+ } else {
+ return false;
+ }
+
+ return true;
+}
-bool CdsPass::instrumentAtomic(Instruction * I) {
- IRBuilder<> IRB(I);
- // LLVMContext &Ctx = IRB.getContext();
-
- if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
- int atomic_order_index = getAtomicOrderIndex(SI->getOrdering());
-
- Value *val = SI->getValueOperand();
- Value *ptr = SI->getPointerOperand();
- Value *order = ConstantInt::get(OrdTy, atomic_order_index);
- Value *args[] = {ptr, order, val};
-
- int size=getTypeSize(ptr->getType());
- int index=sizetoindex(size);
-
- Instruction* funcInst=CallInst::Create(CdsAtomicStore[index], args,"");
- ReplaceInstWithInst(SI, funcInst);
- errs() << "Store replaced\n";
- } else if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
- int atomic_order_index = getAtomicOrderIndex(LI->getOrdering());
-
- Value *ptr = LI->getPointerOperand();
- Value *order = ConstantInt::get(OrdTy, atomic_order_index);
- Value *args[] = {ptr, order};
-
- int size=getTypeSize(ptr->getType());
- int index=sizetoindex(size);
-
- Instruction* funcInst=CallInst::Create(CdsAtomicLoad[index], args, "");
- ReplaceInstWithInst(LI, funcInst);
- errs() << "Load Replaced\n";
- } else if (AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(I)) {
- int atomic_order_index = getAtomicOrderIndex(RMWI->getOrdering());
-
- Value *val = RMWI->getValOperand();
- Value *ptr = RMWI->getPointerOperand();
- Value *order = ConstantInt::get(OrdTy, atomic_order_index);
- Value *args[] = {ptr, order, val};
-
- int size = getTypeSize(ptr->getType());
- int index = sizetoindex(size);
-
- Instruction* funcInst = CallInst::Create(CdsAtomicRMW[RMWI->getOperation()][index], args, "");
- ReplaceInstWithInst(RMWI, funcInst);
- errs() << RMWI->getOperationName(RMWI->getOperation());
- errs() << " replaced\n";
- } else if (AtomicCmpXchgInst *CASI = dyn_cast<AtomicCmpXchgInst>(I)) {
- IRBuilder<> IRB(CASI);
-
- Value *Addr = CASI->getPointerOperand();
-
- int size = getTypeSize(Addr->getType());
- int index = sizetoindex(size);
- const unsigned ByteSize = 1U << index;
- const unsigned BitSize = ByteSize * 8;
- Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize);
- Type *PtrTy = Ty->getPointerTo();
-
- Value *CmpOperand = IRB.CreateBitOrPointerCast(CASI->getCompareOperand(), Ty);
- Value *NewOperand = IRB.CreateBitOrPointerCast(CASI->getNewValOperand(), Ty);
-
- int atomic_order_index_succ = getAtomicOrderIndex(CASI->getSuccessOrdering());
- int atomic_order_index_fail = getAtomicOrderIndex(CASI->getFailureOrdering());
- Value *order_succ = ConstantInt::get(OrdTy, atomic_order_index_succ);
- Value *order_fail = ConstantInt::get(OrdTy, atomic_order_index_fail);
-
- Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy),
- CmpOperand, NewOperand,
- order_succ, order_fail};
-
- CallInst *funcInst = IRB.CreateCall(CdsAtomicCAS[index], Args);
- Value *Success = IRB.CreateICmpEQ(funcInst, CmpOperand);
-
- Value *OldVal = funcInst;
- Type *OrigOldValTy = CASI->getNewValOperand()->getType();
- if (Ty != OrigOldValTy) {
- // The value is a pointer, so we need to cast the return value.
- OldVal = IRB.CreateIntToPtr(funcInst, OrigOldValTy);
- }
-
- Value *Res =
- IRB.CreateInsertValue(UndefValue::get(CASI->getType()), OldVal, 0);
- Res = IRB.CreateInsertValue(Res, Success, 1);
-
- I->replaceAllUsesWith(Res);
- I->eraseFromParent();
- } else if (FenceInst *FI = dyn_cast<FenceInst>(I)) {
- int atomic_order_index = getAtomicOrderIndex(FI->getOrdering());
- Value *order = ConstantInt::get(OrdTy, atomic_order_index);
- Value *Args[] = {order};
-
- CallInst *funcInst = CallInst::Create(CdsAtomicThreadFence, Args);
- ReplaceInstWithInst(FI, funcInst);
- errs() << "Thread Fences replaced\n";
- }
- return true;
+bool CDSPass::instrumentMemIntrinsic(Instruction *I) {
+ IRBuilder<> IRB(I);
+ if (MemSetInst *M = dyn_cast<MemSetInst>(I)) {
+ IRB.CreateCall(
+ MemsetFn,
+ {IRB.CreatePointerCast(M->getArgOperand(0), IRB.getInt8PtrTy()),
+ IRB.CreateIntCast(M->getArgOperand(1), IRB.getInt32Ty(), false),
+ IRB.CreateIntCast(M->getArgOperand(2), IntPtrTy, false)});
+ I->eraseFromParent();
+ } else if (MemTransferInst *M = dyn_cast<MemTransferInst>(I)) {
+ IRB.CreateCall(
+ isa<MemCpyInst>(M) ? MemcpyFn : MemmoveFn,
+ {IRB.CreatePointerCast(M->getArgOperand(0), IRB.getInt8PtrTy()),
+ IRB.CreatePointerCast(M->getArgOperand(1), IRB.getInt8PtrTy()),
+ IRB.CreateIntCast(M->getArgOperand(2), IntPtrTy, false)});
+ I->eraseFromParent();
+ }
+ return false;
}
+bool CDSPass::instrumentAtomic(Instruction * I, const DataLayout &DL) {
+ IRBuilder<> IRB(I);
+ Value *position = getPosition(I, IRB);
+
+ if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
+ Value *Addr = LI->getPointerOperand();
+ int Idx=getMemoryAccessFuncIndex(Addr, DL);
+ if (Idx < 0)
+ return false;
+
+ int atomic_order_index = getAtomicOrderIndex(LI->getOrdering());
+ Value *order = ConstantInt::get(OrdTy, atomic_order_index);
+ Value *Args[] = {Addr, order, position};
+ Instruction* funcInst = CallInst::Create(CDSAtomicLoad[Idx], Args);
+ ReplaceInstWithInst(LI, funcInst);
+ } else if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
+ Value *Addr = SI->getPointerOperand();
+ int Idx=getMemoryAccessFuncIndex(Addr, DL);
+ if (Idx < 0)
+ return false;
+
+ int atomic_order_index = getAtomicOrderIndex(SI->getOrdering());
+ Value *val = SI->getValueOperand();
+ Value *order = ConstantInt::get(OrdTy, atomic_order_index);
+ Value *Args[] = {Addr, val, order, position};
+ Instruction* funcInst = CallInst::Create(CDSAtomicStore[Idx], Args);
+ ReplaceInstWithInst(SI, funcInst);
+ } else if (AtomicRMWInst *RMWI = dyn_cast<AtomicRMWInst>(I)) {
+ Value *Addr = RMWI->getPointerOperand();
+ int Idx=getMemoryAccessFuncIndex(Addr, DL);
+ if (Idx < 0)
+ return false;
+
+ int atomic_order_index = getAtomicOrderIndex(RMWI->getOrdering());
+ Value *val = RMWI->getValOperand();
+ Value *order = ConstantInt::get(OrdTy, atomic_order_index);
+ Value *Args[] = {Addr, val, order, position};
+ Instruction* funcInst = CallInst::Create(CDSAtomicRMW[RMWI->getOperation()][Idx], Args);
+ ReplaceInstWithInst(RMWI, funcInst);
+ } else if (AtomicCmpXchgInst *CASI = dyn_cast<AtomicCmpXchgInst>(I)) {
+ IRBuilder<> IRB(CASI);
+
+ Value *Addr = CASI->getPointerOperand();
+ int Idx=getMemoryAccessFuncIndex(Addr, DL);
+ if (Idx < 0)
+ return false;
+
+ const unsigned ByteSize = 1U << Idx;
+ const unsigned BitSize = ByteSize * 8;
+ Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize);
+ Type *PtrTy = Ty->getPointerTo();
+
+ Value *CmpOperand = IRB.CreateBitOrPointerCast(CASI->getCompareOperand(), Ty);
+ Value *NewOperand = IRB.CreateBitOrPointerCast(CASI->getNewValOperand(), Ty);
+
+ int atomic_order_index_succ = getAtomicOrderIndex(CASI->getSuccessOrdering());
+ int atomic_order_index_fail = getAtomicOrderIndex(CASI->getFailureOrdering());
+ Value *order_succ = ConstantInt::get(OrdTy, atomic_order_index_succ);
+ Value *order_fail = ConstantInt::get(OrdTy, atomic_order_index_fail);
+
+ Value *Args[] = {IRB.CreatePointerCast(Addr, PtrTy),
+ CmpOperand, NewOperand,
+ order_succ, order_fail, position};
+
+ CallInst *funcInst = IRB.CreateCall(CDSAtomicCAS_V1[Idx], Args);
+ Value *Success = IRB.CreateICmpEQ(funcInst, CmpOperand);
+
+ Value *OldVal = funcInst;
+ Type *OrigOldValTy = CASI->getNewValOperand()->getType();
+ if (Ty != OrigOldValTy) {
+ // The value is a pointer, so we need to cast the return value.
+ OldVal = IRB.CreateIntToPtr(funcInst, OrigOldValTy);
+ }
+
+ Value *Res =
+ IRB.CreateInsertValue(UndefValue::get(CASI->getType()), OldVal, 0);
+ Res = IRB.CreateInsertValue(Res, Success, 1);
+
+ I->replaceAllUsesWith(Res);
+ I->eraseFromParent();
+ } else if (FenceInst *FI = dyn_cast<FenceInst>(I)) {
+ int atomic_order_index = getAtomicOrderIndex(FI->getOrdering());
+ Value *order = ConstantInt::get(OrdTy, atomic_order_index);
+ Value *Args[] = {order, position};
+
+ CallInst *funcInst = CallInst::Create(CDSAtomicThreadFence, Args);
+ ReplaceInstWithInst(FI, funcInst);
+ // errs() << "Thread Fences replaced\n";
+ }
+ return true;
+}
+int CDSPass::getMemoryAccessFuncIndex(Value *Addr,
+ const DataLayout &DL) {
+ Type *OrigPtrTy = Addr->getType();
+ Type *OrigTy = cast<PointerType>(OrigPtrTy)->getElementType();
+ assert(OrigTy->isSized());
+ uint32_t TypeSize = DL.getTypeStoreSizeInBits(OrigTy);
+ if (TypeSize != 8 && TypeSize != 16 &&
+ TypeSize != 32 && TypeSize != 64 && TypeSize != 128) {
+ NumAccessesWithBadSize++;
+ // Ignore all unusual sizes.
+ return -1;
+ }
+ size_t Idx = countTrailingZeros(TypeSize / 8);
+ //assert(Idx < kNumberOfAccessSizes);
+ if (Idx >= kNumberOfAccessSizes) {
+ return -1;
+ }
+ return Idx;
+}
-char CdsPass::ID = 0;
+char CDSPass::ID = 0;
// Automatically enable the pass.
-// http://adriansampson.net/blog/clangpass.html
-static void registerCdsPass(const PassManagerBuilder &,
- legacy::PassManagerBase &PM) {
- PM.add(new CdsPass());
+static void registerCDSPass(const PassManagerBuilder &,
+ legacy::PassManagerBase &PM) {
+ PM.add(new CDSPass());
}
+
+/* Enable the pass when opt level is greater than 0 */
+static RegisterStandardPasses
+ RegisterMyPass1(PassManagerBuilder::EP_OptimizerLast,
+registerCDSPass);
+
+/* Enable the pass when opt level is 0 */
static RegisterStandardPasses
- RegisterMyPass(PassManagerBuilder::EP_EarlyAsPossible,
-registerCdsPass);
\ No newline at end of file
+ RegisterMyPass2(PassManagerBuilder::EP_EnabledOnOptLevel0,
+registerCDSPass);
projects / c11llvm.git / blobdiff