//===-- CDSPass.cpp - xxx -------------------------------===//
//
--// The LLVM Compiler Infrastructure
--//
++// 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/Transforms/IPO/PassManagerBuilder.h"
#include <vector>
--#define DEBUG_TYPE "CDS"
using namespace llvm;
-#include "getPosition.hpp"
-
-#define FUNCARRAYSIZE 4
++#define DEBUG_TYPE "CDS"
+#include <llvm/IR/DebugLoc.h>
+
+Value *getPosition( Instruction * I, IRBuilder <> IRB)
+{
+ const DebugLoc & debug_location = I->getDebugLoc ();
+ std::string position_string;
+ {
+ llvm::raw_string_ostream position_stream (position_string);
+ debug_location . print (position_stream);
+ }
+
+ return IRB . CreateGlobalStringPtr (position_string);
+}
- #define FUNCARRAYSIZE 4
-
STATISTIC(NumInstrumentedReads, "Number of instrumented reads");
STATISTIC(NumInstrumentedWrites, "Number of instrumented writes");
++STATISTIC(NumAccessesWithBadSize, "Number of accesses with bad size");
// STATISTIC(NumInstrumentedVtableWrites, "Number of vtable ptr writes");
// STATISTIC(NumInstrumentedVtableReads, "Number of vtable ptr reads");
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;
Type * Int8PtrTy;
Type * VoidTy;
--Constant * CDSLoad[FUNCARRAYSIZE];
--Constant * CDSStore[FUNCARRAYSIZE];
--Constant * CDSAtomicInit[FUNCARRAYSIZE];
--Constant * CDSAtomicLoad[FUNCARRAYSIZE];
--Constant * CDSAtomicStore[FUNCARRAYSIZE];
--Constant * CDSAtomicRMW[AtomicRMWInst::LAST_BINOP + 1][FUNCARRAYSIZE];
--Constant * CDSAtomicCAS_V1[FUNCARRAYSIZE];
--Constant * CDSAtomicCAS_V2[FUNCARRAYSIZE];
++static const size_t kNumberOfAccessSizes = 4;
++Constant * CDSLoad[kNumberOfAccessSizes];
++Constant * CDSStore[kNumberOfAccessSizes];
++Constant * CDSAtomicInit[kNumberOfAccessSizes];
++Constant * CDSAtomicLoad[kNumberOfAccessSizes];
++Constant * CDSAtomicStore[kNumberOfAccessSizes];
++Constant * CDSAtomicRMW[AtomicRMWInst::LAST_BINOP + 1][kNumberOfAccessSizes];
++Constant * CDSAtomicCAS_V1[kNumberOfAccessSizes];
++Constant * CDSAtomicCAS_V2[kNumberOfAccessSizes];
Constant * CDSAtomicThreadFence;
--bool start = false;
--
int getAtomicOrderIndex(AtomicOrdering order){
switch (order) {
case AtomicOrdering::Monotonic:
}
}
--int getTypeSize(Type* type) {
-- if (type == Int8PtrTy) {
-- return sizeof(char)*8;
-- } else if (type == Int16PtrTy) {
-- return sizeof(short)*8;
-- } else if (type == Int32PtrTy) {
-- return sizeof(int)*8;
-- } else if (type == Int64PtrTy) {
-- return sizeof(long long int)*8;
-- } else {
-- return sizeof(void*)*8;
-- }
--
-- return -1;
--}
--
--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;
--}
--
namespace {
struct CDSPass : public FunctionPass {
static char ID;
return false;
}
-#include "initializeCallbacks.hpp"
-#include "isAtomicCall.hpp"
-#include "instrumentAtomicCall.hpp"
+void CDSPass::initializeCallbacks(Module &M) {
+ LLVMContext &Ctx = M.getContext();
+
+ Type * Int1Ty = Type::getInt1Ty(Ctx);
- 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++) {
++ 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> AtomicInitName("cds_atomic_init" + BitSizeStr);
+ SmallString<32> AtomicLoadName("cds_atomic_load" + BitSizeStr);
+ SmallString<32> AtomicStoreName("cds_atomic_store" + BitSizeStr);
+
+ CDSLoad[i] = M.getOrInsertFunction(LoadName, VoidTy, PtrTy);
+ CDSStore[i] = M.getOrInsertFunction(StoreName, VoidTy, PtrTy);
+ CDSAtomicInit[i] = M.getOrInsertFunction(AtomicInitName,
+ VoidTy, PtrTy, Ty, Int8PtrTy);
+ CDSAtomicLoad[i] = M.getOrInsertFunction(AtomicLoadName,
+ Ty, PtrTy, OrdTy, Int8PtrTy);
+ CDSAtomicStore[i] = M.getOrInsertFunction(AtomicStoreName,
+ 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] = M.getOrInsertFunction(AtomicRMWName,
+ 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] = M.getOrInsertFunction(AtomicCASName_V1,
+ Ty, PtrTy, Ty, Ty, OrdTy, OrdTy, Int8PtrTy);
+ CDSAtomicCAS_V2[i] = M.getOrInsertFunction(AtomicCASName_V2,
+ Int1Ty, PtrTy, PtrTy, Ty, OrdTy, OrdTy, Int8PtrTy);
+ }
+
+ CDSAtomicThreadFence = M.getOrInsertFunction("cds_atomic_thread_fence",
+ VoidTy, OrdTy, Int8PtrTy);
+}
+
+void printArgs(CallInst *);
+
- bool isAtomicCall(Instruction *I)
- {
++bool isAtomicCall(Instruction *I) {
+ if ( auto *CI = dyn_cast<CallInst>(I) ) {
+ Function *fun = CI->getCalledFunction();
+ if (fun == NULL)
+ return false;
+
+ StringRef funName = fun->getName();
-
- if ( (CI->isTailCall() && funName.contains("atomic_")) ||
- funName.contains("atomic_compare_exchange_") ) {
- // printArgs(CI);
- return true;
++ // todo: come up with better rules for function name checking
++ if ( funName.contains("atomic_") ) {
++ return true;
++ } else if (funName.contains("atomic") ) {
++ return true;
+ }
+ }
+
+ return false;
+}
+
- void printArgs (CallInst *CI)
- {
++void printArgs (CallInst *CI) {
+ Function *fun = CI->getCalledFunction();
+ StringRef funName = fun->getName();
+
+ User::op_iterator begin = CI->arg_begin();
+ User::op_iterator end = CI->arg_end();
+
+ if ( funName.contains("atomic_") ) {
+ std::vector<Value *> parameters;
+
+ for (User::op_iterator it = begin; it != end; ++it) {
+ Value *param = *it;
+ parameters.push_back(param);
+ errs() << *param << " type: " << *param->getType() << "\n";
+ }
+ }
+
+}
+
+bool CDSPass::instrumentAtomicCall(CallInst *CI, const DataLayout &DL) {
+ IRBuilder<> IRB(CI);
+ Function *fun = CI->getCalledFunction();
+ StringRef funName = fun->getName();
+ std::vector<Value *> parameters;
+
+ User::op_iterator begin = CI->arg_begin();
+ User::op_iterator end = CI->arg_end();
+ for (User::op_iterator it = begin; it != end; ++it) {
+ Value *param = *it;
+ parameters.push_back(param);
+ }
+
+ // obtain source line number of the CallInst
+ Value *position = getPosition(CI, IRB);
+
+ // the pointer to the address is always the first argument
+ Value *OrigPtr = parameters[0];
+ int Idx = getMemoryAccessFuncIndex(OrigPtr, 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();
+
+ // atomic_init; args = {obj, order}
+ if (funName.contains("atomic_init")) {
+ Value *ptr = IRB.CreatePointerCast(OrigPtr, PtrTy);
+ Value *val = IRB.CreateBitOrPointerCast(parameters[1], Ty);
+ Value *args[] = {ptr, val, position};
+
+ Instruction* funcInst=CallInst::Create(CDSAtomicInit[Idx], args);
+ ReplaceInstWithInst(CI, funcInst);
+
+ return true;
+ }
+
+ // atomic_load; args = {obj, order}
+ if (funName.contains("atomic_load")) {
+ bool isExplicit = funName.contains("atomic_load_explicit");
+
+ Value *ptr = IRB.CreatePointerCast(OrigPtr, PtrTy);
+ Value *order;
+ if (isExplicit)
+ order = IRB.CreateBitOrPointerCast(parameters[1], OrdTy);
+ else
+ order = ConstantInt::get(OrdTy,
+ (int) AtomicOrderingCABI::seq_cst);
+ Value *args[] = {ptr, order, position};
+
+ Instruction* funcInst=CallInst::Create(CDSAtomicLoad[Idx], args);
+ ReplaceInstWithInst(CI, funcInst);
+
+ return true;
- }
++ } else if (funName.contains("atomic") &&
++ funName.contains("load")) {
++ // does this version of call always have an atomic order as an argument?
++ Value *ptr = IRB.CreatePointerCast(OrigPtr, PtrTy);
++ Value *order = IRB.CreateBitOrPointerCast(parameters[1], OrdTy);
++ Value *args[] = {ptr, order, position};
++
++ //Instruction* funcInst=CallInst::Create(CDSAtomicLoad[Idx], args);
++ CallInst *funcInst = IRB.CreateCall(CDSAtomicLoad[Idx], args);
++ Value *RetVal = IRB.CreateIntToPtr(funcInst, CI->getType());
++
++ CI->replaceAllUsesWith(RetVal);
++ CI->eraseFromParent();
++
++ return true;
++ }
+
+ // atomic_store; args = {obj, val, order}
+ if (funName.contains("atomic_store")) {
+ bool isExplicit = funName.contains("atomic_store_explicit");
+ Value *OrigVal = parameters[1];
+
+ Value *ptr = IRB.CreatePointerCast(OrigPtr, PtrTy);
+ Value *val = IRB.CreatePointerCast(OrigVal, Ty);
+ Value *order;
+ if (isExplicit)
+ order = IRB.CreateBitOrPointerCast(parameters[2], OrdTy);
+ else
+ order = ConstantInt::get(OrdTy,
+ (int) AtomicOrderingCABI::seq_cst);
+ Value *args[] = {ptr, val, order, position};
+
+ Instruction* funcInst=CallInst::Create(CDSAtomicStore[Idx], args);
+ ReplaceInstWithInst(CI, funcInst);
+
+ return true;
- }
++ } else if (funName.contains("atomic") &&
++ funName.contains("EEEE5store")) {
++ // does this version of call always have an atomic order as an argument?
++ Value *OrigVal = parameters[1];
++
++ Value *ptr = IRB.CreatePointerCast(OrigPtr, PtrTy);
++ Value *val = IRB.CreatePointerCast(OrigVal, Ty);
++ Value *order = IRB.CreateBitOrPointerCast(parameters[1], OrdTy);
++ Value *args[] = {ptr, val, order, position};
++
++ Instruction* funcInst = CallInst::Create(CDSAtomicStore[Idx], args);
++ ReplaceInstWithInst(CI, funcInst);
++
++ return true;
++ }
++
+
+ // atomic_fetch_*; args = {obj, val, order}
+ if (funName.contains("atomic_fetch_") ||
+ funName.contains("atomic_exchange") ) {
+ bool isExplicit = funName.contains("_explicit");
+ Value *OrigVal = parameters[1];
+
+ int op;
+ if ( funName.contains("_fetch_add") )
+ op = AtomicRMWInst::Add;
+ else if ( funName.contains("_fetch_sub") )
+ op = AtomicRMWInst::Sub;
+ else if ( funName.contains("_fetch_and") )
+ op = AtomicRMWInst::And;
+ else if ( funName.contains("_fetch_or") )
+ op = AtomicRMWInst::Or;
+ else if ( funName.contains("_fetch_xor") )
+ op = AtomicRMWInst::Xor;
+ else if ( funName.contains("atomic_exchange") )
+ op = AtomicRMWInst::Xchg;
+ else {
+ errs() << "Unknown atomic read modify write operation\n";
+ return false;
+ }
+
+ Value *ptr = IRB.CreatePointerCast(OrigPtr, PtrTy);
+ Value *val = IRB.CreatePointerCast(OrigVal, Ty);
+ Value *order;
+ if (isExplicit)
+ order = IRB.CreateBitOrPointerCast(parameters[2], OrdTy);
+ else
+ order = ConstantInt::get(OrdTy,
+ (int) AtomicOrderingCABI::seq_cst);
+ Value *args[] = {ptr, val, order, position};
+
+ Instruction* funcInst=CallInst::Create(CDSAtomicRMW[op][Idx], args);
+ ReplaceInstWithInst(CI, funcInst);
+
+ return true;
- }
++ } else if (funName.contains("fetch")) {
++ errs() << "atomic exchange captured. Not implemented yet. ";
++ errs() << "See source file :";
++ getPositionPrint(CI, IRB);
++ } else if (funName.contains("exchange") &&
++ !funName.contains("compare_exchange") ) {
++ errs() << "atomic exchange captured. Not implemented yet. ";
++ errs() << "See source file :";
++ getPositionPrint(CI, IRB);
++ }
+
+ /* atomic_compare_exchange_*;
+ args = {obj, expected, new value, order1, order2}
+ */
+ if ( funName.contains("atomic_compare_exchange_") ) {
+ bool isExplicit = funName.contains("_explicit");
+
+ Value *Addr = IRB.CreatePointerCast(OrigPtr, PtrTy);
+ Value *CmpOperand = IRB.CreatePointerCast(parameters[1], PtrTy);
+ Value *NewOperand = IRB.CreateBitOrPointerCast(parameters[2], Ty);
+
+ Value *order_succ, *order_fail;
+ if (isExplicit) {
+ order_succ = IRB.CreateBitOrPointerCast(parameters[3], OrdTy);
+ order_fail = IRB.CreateBitOrPointerCast(parameters[4], OrdTy);
+ } else {
+ order_succ = ConstantInt::get(OrdTy,
+ (int) AtomicOrderingCABI::seq_cst);
+ order_fail = ConstantInt::get(OrdTy,
+ (int) AtomicOrderingCABI::seq_cst);
+ }
+
+ Value *args[] = {Addr, CmpOperand, NewOperand,
+ order_succ, order_fail, position};
+
+ Instruction* funcInst=CallInst::Create(CDSAtomicCAS_V2[Idx], args);
+ ReplaceInstWithInst(CI, funcInst);
+
+ return true;
- }
++ } else if ( funName.contains("compare_exchange_strong") ||
++ funName.contains("compare_exchange_weak") ) {
++ Value *Addr = IRB.CreatePointerCast(OrigPtr, PtrTy);
++ Value *CmpOperand = IRB.CreatePointerCast(parameters[1], PtrTy);
++ Value *NewOperand = IRB.CreateBitOrPointerCast(parameters[2], Ty);
++
++ Value *order_succ, *order_fail;
++ order_succ = IRB.CreateBitOrPointerCast(parameters[3], OrdTy);
++ order_fail = IRB.CreateBitOrPointerCast(parameters[4], OrdTy);
++
++ Value *args[] = {Addr, CmpOperand, NewOperand,
++ order_succ, order_fail, position};
++ Instruction* funcInst=CallInst::Create(CDSAtomicCAS_V2[Idx], args);
++ ReplaceInstWithInst(CI, funcInst);
++
++ return true;
++ }
++
+
+ return false;
+}
static bool shouldInstrumentReadWriteFromAddress(const Module *M, Value *Addr) {
// Peel off GEPs and BitCasts.
if (Addr->isSwiftError())
return false;
-- int size = getTypeSize(Addr->getType());
-- int index = sizetoindex(size);
++ int Idx = getMemoryAccessFuncIndex(Addr, DL);
++
// not supported by CDS yet
/* if (IsWrite && isVtableAccess(I)) {
*/
Value *OnAccessFunc = nullptr;
-- OnAccessFunc = IsWrite ? CDSStore[index] : CDSLoad[index];
++ OnAccessFunc = IsWrite ? CDSStore[Idx] : CDSLoad[Idx];
Type *ArgType = IRB.CreatePointerCast(Addr, Addr->getType())->getType();
return true;
}
--// todo: replace getTypeSize with the getMemoryAccessFuncIndex
bool CDSPass::instrumentAtomic(Instruction * I, const DataLayout &DL) {
IRBuilder<> IRB(I);
// LLVMContext &Ctx = IRB.getContext();
Value *position = getPosition(I, IRB);
-- if (StoreInst *SI = dyn_cast<StoreInst>(I)) {
++ if (LoadInst *LI = dyn_cast<LoadInst>(I)) {
++ Value *Addr = LI->getPointerOperand();
++ int Idx=getMemoryAccessFuncIndex(Addr, DL);
++ 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);
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, val, order, position};
--
-- int size=getTypeSize(ptr->getType());
-- int index=sizetoindex(size);
--
-- Instruction* funcInst=CallInst::Create(CDSAtomicStore[index], args);
++ Value *args[] = {Addr, val, order, position};
++ Instruction* funcInst=CallInst::Create(CDSAtomicStore[Idx], 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, position};
--
-- 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)) {
++ Value *Addr = RMWI->getPointerOperand();
++ int Idx=getMemoryAccessFuncIndex(Addr, DL);
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, val, order, position};
--
-- int size = getTypeSize(ptr->getType());
-- int index = sizetoindex(size);
--
-- Instruction* funcInst = CallInst::Create(CDSAtomicRMW[RMWI->getOperation()][index], args);
++ Value *args[] = {Addr, val, order, position};
++ Instruction* funcInst = CallInst::Create(CDSAtomicRMW[RMWI->getOperation()][Idx], 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 Idx=getMemoryAccessFuncIndex(Addr, DL);
-- int size = getTypeSize(Addr->getType());
-- int index = sizetoindex(size);
-- const unsigned ByteSize = 1U << index;
++ const unsigned ByteSize = 1U << Idx;
const unsigned BitSize = ByteSize * 8;
Type *Ty = Type::getIntNTy(IRB.getContext(), BitSize);
Type *PtrTy = Ty->getPointerTo();
CmpOperand, NewOperand,
order_succ, order_fail, position};
-- CallInst *funcInst = IRB.CreateCall(CDSAtomicCAS_V1[index], Args);
++ CallInst *funcInst = IRB.CreateCall(CDSAtomicCAS_V1[Idx], Args);
Value *Success = IRB.CreateICmpEQ(funcInst, CmpOperand);
Value *OldVal = funcInst;
uint32_t TypeSize = DL.getTypeStoreSizeInBits(OrigTy);
if (TypeSize != 8 && TypeSize != 16 &&
TypeSize != 32 && TypeSize != 64 && TypeSize != 128) {
-- // NumAccessesWithBadSize++;
++ NumAccessesWithBadSize++;
// Ignore all unusual sizes.
return -1;
}
size_t Idx = countTrailingZeros(TypeSize / 8);
-- // assert(Idx < FUNCARRAYSIZE);
++ assert(Idx < kNumberOfAccessSizes);
return Idx;
}
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