#ifndef LLVM_ADT_POINTERINTPAIR_H
#define LLVM_ADT_POINTERINTPAIR_H
+#include "llvm/Support/Compiler.h"
#include "llvm/Support/PointerLikeTypeTraits.h"
#include <cassert>
+#include <limits>
namespace llvm {
/// on the number of bits available according to PointerLikeTypeTraits for the
/// type.
///
-/// Note that PointerIntPair always puts the Int part in the highest bits
+/// Note that PointerIntPair always puts the IntVal part in the highest bits
/// possible. For example, PointerIntPair<void*, 1, bool> will put the bit for
/// the bool into bit #2, not bit #0, which allows the low two bits to be used
/// for something else. For example, this allows:
typename PtrTraits = PointerLikeTypeTraits<PointerTy> >
class PointerIntPair {
intptr_t Value;
- enum {
+ static_assert(PtrTraits::NumLowBitsAvailable <
+ std::numeric_limits<uintptr_t>::digits,
+ "cannot use a pointer type that has all bits free");
+ static_assert(IntBits <= PtrTraits::NumLowBitsAvailable,
+ "PointerIntPair with integer size too large for pointer");
+ enum : uintptr_t {
/// PointerBitMask - The bits that come from the pointer.
PointerBitMask =
~(uintptr_t)(((intptr_t)1 << PtrTraits::NumLowBitsAvailable)-1),
/// IntShift - The number of low bits that we reserve for other uses, and
/// keep zero.
- IntShift = (uintptr_t)PtrTraits::NumLowBitsAvailable-IntBits,
-
+ IntShift = (uintptr_t)PtrTraits::NumLowBitsAvailable - IntBits,
+
/// IntMask - This is the unshifted mask for valid bits of the int type.
- IntMask = (uintptr_t)(((intptr_t)1 << IntBits)-1),
-
+ IntMask = (uintptr_t)(((intptr_t)1 << IntBits) - 1),
+
// ShiftedIntMask - This is the bits for the integer shifted in place.
ShiftedIntMask = (uintptr_t)(IntMask << IntShift)
};
+
public:
PointerIntPair() : Value(0) {}
- PointerIntPair(PointerTy Ptr, IntType Int) {
- assert(IntBits <= PtrTraits::NumLowBitsAvailable &&
- "PointerIntPair formed with integer size too large for pointer");
- setPointerAndInt(Ptr, Int);
+ PointerIntPair(PointerTy PtrVal, IntType IntVal) {
+ setPointerAndInt(PtrVal, IntVal);
}
- explicit PointerIntPair(PointerTy Ptr) {
- initWithPointer(Ptr);
+ explicit PointerIntPair(PointerTy PtrVal) {
+ initWithPointer(PtrVal);
}
PointerTy getPointer() const {
return (IntType)((Value >> IntShift) & IntMask);
}
- void setPointer(PointerTy Ptr) {
- intptr_t PtrVal
- = reinterpret_cast<intptr_t>(PtrTraits::getAsVoidPointer(Ptr));
- assert((PtrVal & ((1 << PtrTraits::NumLowBitsAvailable)-1)) == 0 &&
+ void setPointer(PointerTy PtrVal) {
+ intptr_t PtrWord
+ = reinterpret_cast<intptr_t>(PtrTraits::getAsVoidPointer(PtrVal));
+ assert((PtrWord & ~PointerBitMask) == 0 &&
"Pointer is not sufficiently aligned");
// Preserve all low bits, just update the pointer.
- Value = PtrVal | (Value & ~PointerBitMask);
+ Value = PtrWord | (Value & ~PointerBitMask);
}
- void setInt(IntType Int) {
- intptr_t IntVal = Int;
- assert(IntVal < (1 << IntBits) && "Integer too large for field");
-
+ void setInt(IntType IntVal) {
+ intptr_t IntWord = static_cast<intptr_t>(IntVal);
+ assert((IntWord & ~IntMask) == 0 && "Integer too large for field");
+
// Preserve all bits other than the ones we are updating.
Value &= ~ShiftedIntMask; // Remove integer field.
- Value |= IntVal << IntShift; // Set new integer.
+ Value |= IntWord << IntShift; // Set new integer.
}
- void initWithPointer(PointerTy Ptr) {
- intptr_t PtrVal
- = reinterpret_cast<intptr_t>(PtrTraits::getAsVoidPointer(Ptr));
- assert((PtrVal & ((1 << PtrTraits::NumLowBitsAvailable)-1)) == 0 &&
+ void initWithPointer(PointerTy PtrVal) {
+ intptr_t PtrWord
+ = reinterpret_cast<intptr_t>(PtrTraits::getAsVoidPointer(PtrVal));
+ assert((PtrWord & ~PointerBitMask) == 0 &&
"Pointer is not sufficiently aligned");
- Value = PtrVal;
+ Value = PtrWord;
}
- void setPointerAndInt(PointerTy Ptr, IntType Int) {
- intptr_t PtrVal
- = reinterpret_cast<intptr_t>(PtrTraits::getAsVoidPointer(Ptr));
- assert((PtrVal & ((1 << PtrTraits::NumLowBitsAvailable)-1)) == 0 &&
+ void setPointerAndInt(PointerTy PtrVal, IntType IntVal) {
+ intptr_t PtrWord
+ = reinterpret_cast<intptr_t>(PtrTraits::getAsVoidPointer(PtrVal));
+ assert((PtrWord & ~PointerBitMask) == 0 &&
"Pointer is not sufficiently aligned");
- intptr_t IntVal = Int;
- assert(IntVal < (1 << IntBits) && "Integer too large for field");
+ intptr_t IntWord = static_cast<intptr_t>(IntVal);
+ assert((IntWord & ~IntMask) == 0 && "Integer too large for field");
- Value = PtrVal | (IntVal << IntShift);
+ Value = PtrWord | (IntWord << IntShift);
}
PointerTy const *getAddrOfPointer() const {
void setFromOpaqueValue(void *Val) { Value = reinterpret_cast<intptr_t>(Val);}
static PointerIntPair getFromOpaqueValue(void *V) {
- PointerIntPair P; P.setFromOpaqueValue(V); return P;
+ PointerIntPair P;
+ P.setFromOpaqueValue(V);
+ return P;
}
// Allow PointerIntPairs to be created from const void * if and only if the
struct isPodLike<PointerIntPair<PointerTy, IntBits, IntType> > {
static const bool value = true;
};
-
+
// Provide specialization of DenseMapInfo for PointerIntPair.
template<typename PointerTy, unsigned IntBits, typename IntType>
struct DenseMapInfo<PointerIntPair<PointerTy, IntBits, IntType> > {
typedef PointerIntPair<PointerTy, IntBits, IntType> Ty;
static Ty getEmptyKey() {
uintptr_t Val = static_cast<uintptr_t>(-1);
- Val <<= PointerLikeTypeTraits<PointerTy>::NumLowBitsAvailable;
- return Ty(reinterpret_cast<PointerTy>(Val), IntType((1 << IntBits)-1));
+ Val <<= PointerLikeTypeTraits<Ty>::NumLowBitsAvailable;
+ return Ty::getFromOpaqueValue(reinterpret_cast<void *>(Val));
}
static Ty getTombstoneKey() {
uintptr_t Val = static_cast<uintptr_t>(-2);
Val <<= PointerLikeTypeTraits<PointerTy>::NumLowBitsAvailable;
- return Ty(reinterpret_cast<PointerTy>(Val), IntType(0));
+ return Ty::getFromOpaqueValue(reinterpret_cast<void *>(Val));
}
static unsigned getHashValue(Ty V) {
uintptr_t IV = reinterpret_cast<uintptr_t>(V.getOpaqueValue());