[turbofan] Make the representation type component independent of the semantic component.

R=rossberg@chromium.org
BUG=

Review URL: https://codereview.chromium.org/904863002

Cr-Commit-Position: refs/heads/master@{#26621}

src/compiler/typer.cc

@@ -436,14 +436,14 @@ void Typer::Decorator::Decorate(Node* node, bool incomplete) {
 
 Bounds Typer::Visitor::TypeUnaryOp(Node* node, UnaryTyperFun f) {
   Bounds input = Operand(node, 0);
-  Type* upper = input.upper->Is(Type::None())
-      ? Type::None()
-      : f(input.upper, typer_);
-  Type* lower = input.lower->Is(Type::None())
-      ? Type::None()
-      : (input.lower == input.upper || upper->IsConstant())
-      ? upper  // TODO(neis): Extend this to Range(x,x), NaN, MinusZero, ...?
-      : f(input.lower, typer_);
+  Type* upper =
+      input.upper->IsInhabited() ? f(input.upper, typer_) : Type::None();
+  Type* lower = input.lower->IsInhabited()
+                    ? ((input.lower == input.upper || upper->IsConstant())
+                           ? upper  // TODO(neis): Extend this to Range(x,x),
+                                    // NaN, MinusZero, ...?
+                           : f(input.lower, typer_))
+                    : Type::None();
   // TODO(neis): Figure out what to do with lower bound.
   return Bounds(lower, upper);
 }
@@ -452,15 +452,16 @@ Bounds Typer::Visitor::TypeUnaryOp(Node* node, UnaryTyperFun f) {
 Bounds Typer::Visitor::TypeBinaryOp(Node* node, BinaryTyperFun f) {
   Bounds left = Operand(node, 0);
   Bounds right = Operand(node, 1);
-  Type* upper = left.upper->Is(Type::None()) || right.upper->Is(Type::None())
-      ? Type::None()
-      : f(left.upper, right.upper, typer_);
-  Type* lower = left.lower->Is(Type::None()) || right.lower->Is(Type::None())
-      ? Type::None()
-      : ((left.lower == left.upper && right.lower == right.upper) ||
+  Type* upper = left.upper->IsInhabited() && right.upper->IsInhabited()
+                    ? f(left.upper, right.upper, typer_)
+                    : Type::None();
+  Type* lower =
+      left.lower->IsInhabited() && right.lower->IsInhabited()
+          ? (((left.lower == left.upper && right.lower == right.upper) ||
               upper->IsConstant())
                  ? upper
-      : f(left.lower, right.lower, typer_);
+                 : f(left.lower, right.lower, typer_))
+          : Type::None();
   // TODO(neis): Figure out what to do with lower bound.
   return Bounds(lower, upper);
 }

src/hydrogen-types.cc

@@ -15,7 +15,7 @@ namespace internal {
 template <class T>
 HType HType::FromType(typename T::TypeHandle type) {
   if (T::Any()->Is(type)) return HType::Any();
-  if (type->Is(T::None())) return HType::None();
+  if (!type->IsInhabited()) return HType::None();
   if (type->Is(T::SignedSmall())) return HType::Smi();
   if (type->Is(T::Number())) return HType::TaggedNumber();
   if (type->Is(T::Null())) return HType::Null();

src/types.cc

@@ -28,7 +28,6 @@ typename TypeImpl<Config>::Limits TypeImpl<Config>::Intersect(
   Limits result(lhs);
   if (lhs.min < rhs.min) result.min = rhs.min;
   if (lhs.max > rhs.max) result.max = rhs.max;
-  result.representation = lhs.representation & rhs.representation;
   return result;
 }
 
@@ -43,10 +42,11 @@ template <class Config>
 typename TypeImpl<Config>::Limits TypeImpl<Config>::Union(Limits lhs,
                                                           Limits rhs) {
   DisallowHeapAllocation no_allocation;
+  if (IsEmpty(lhs)) return rhs;
+  if (IsEmpty(rhs)) return lhs;
   Limits result(lhs);
   if (lhs.min > rhs.min) result.min = rhs.min;
   if (lhs.max < rhs.max) result.max = rhs.max;
-  result.representation = lhs.representation | rhs.representation;
   return result;
 }
 
@@ -66,8 +66,7 @@ bool TypeImpl<Config>::Contains(
     typename TypeImpl<Config>::RangeType* lhs,
     typename TypeImpl<Config>::RangeType* rhs) {
   DisallowHeapAllocation no_allocation;
-  return BitsetType::Is(rhs->Bound(), lhs->Bound()) &&
-         lhs->Min() <= rhs->Min() && rhs->Max() <= lhs->Max();
+  return lhs->Min() <= rhs->Min() && rhs->Max() <= lhs->Max();
 }
 
 
@@ -76,7 +75,6 @@ bool TypeImpl<Config>::Contains(typename TypeImpl<Config>::RangeType* lhs,
                                 typename TypeImpl<Config>::ConstantType* rhs) {
   DisallowHeapAllocation no_allocation;
   return IsInteger(*rhs->Value()) &&
-         BitsetType::Is(rhs->Bound()->AsBitset(), lhs->Bound()) &&
          lhs->Min() <= rhs->Value()->Number() &&
          rhs->Value()->Number() <= lhs->Max();
 }
@@ -87,7 +85,6 @@ bool TypeImpl<Config>::Contains(
     typename TypeImpl<Config>::RangeType* range, i::Object* val) {
   DisallowHeapAllocation no_allocation;
   return IsInteger(val) &&
-         BitsetType::Is(BitsetType::Lub(val), range->Bound()) &&
          range->Min() <= val->Number() && val->Number() <= range->Max();
 }
 
@@ -97,7 +94,7 @@ bool TypeImpl<Config>::Contains(
 
 template<class Config>
 double TypeImpl<Config>::Min() {
-  DCHECK(this->Is(Number()));
+  DCHECK(this->SemanticIs(Number()));
   if (this->IsBitset()) return BitsetType::Min(this->AsBitset());
   if (this->IsUnion()) {
     double min = +V8_INFINITY;
@@ -115,7 +112,7 @@ double TypeImpl<Config>::Min() {
 
 template<class Config>
 double TypeImpl<Config>::Max() {
-  DCHECK(this->Is(Number()));
+  DCHECK(this->SemanticIs(Number()));
   if (this->IsBitset()) return BitsetType::Max(this->AsBitset());
   if (this->IsUnion()) {
     double max = -V8_INFINITY;
@@ -140,23 +137,19 @@ template<class Config>
 typename TypeImpl<Config>::bitset
 TypeImpl<Config>::BitsetType::Glb(TypeImpl* type) {
   DisallowHeapAllocation no_allocation;
+  // Fast case.
   if (type->IsBitset()) {
     return type->AsBitset();
   } else if (type->IsUnion()) {
     SLOW_DCHECK(type->AsUnion()->Wellformed());
     return type->AsUnion()->Get(0)->BitsetGlb() |
-           type->AsUnion()->Get(1)->BitsetGlb();  // Shortcut.
+           SEMANTIC(type->AsUnion()->Get(1)->BitsetGlb());  // Shortcut.
   } else if (type->IsRange()) {
     bitset glb = SEMANTIC(
         BitsetType::Glb(type->AsRange()->Min(), type->AsRange()->Max()));
-    if (glb == 0) {
-      return kNone;
-    } else {
     return glb | REPRESENTATION(type->BitsetLub());
-    }
   } else {
-    // (The remaining BitsetGlb's are None anyway).
-    return kNone;
+    return type->Representation();
   }
 }
 
@@ -168,9 +161,12 @@ TypeImpl<Config>::BitsetType::Lub(TypeImpl* type) {
   DisallowHeapAllocation no_allocation;
   if (type->IsBitset()) return type->AsBitset();
   if (type->IsUnion()) {
-    int bitset = kNone;
+    // Take the representation from the first element, which is always
+    // a bitset.
+    int bitset = type->AsUnion()->Get(0)->BitsetLub();
     for (int i = 0, n = type->AsUnion()->Length(); i < n; ++i) {
-      bitset |= type->AsUnion()->Get(i)->BitsetLub();
+      // Other elements only contribute their semantic part.
+      bitset |= SEMANTIC(type->AsUnion()->Get(i)->BitsetLub());
     }
     return bitset;
   }
@@ -407,7 +403,7 @@ typename TypeImpl<Config>::bitset TypeImpl<Config>::BitsetType::Glb(
 template <class Config>
 double TypeImpl<Config>::BitsetType::Min(bitset bits) {
   DisallowHeapAllocation no_allocation;
-  DCHECK(Is(bits, kNumber));
+  DCHECK(Is(SEMANTIC(bits), kNumber));
   const Boundary* mins = Boundaries();
   bool mz = SEMANTIC(bits & kMinusZero);
   for (size_t i = 0; i < BoundariesSize(); ++i) {
@@ -423,7 +419,7 @@ double TypeImpl<Config>::BitsetType::Min(bitset bits) {
 template<class Config>
 double TypeImpl<Config>::BitsetType::Max(bitset bits) {
   DisallowHeapAllocation no_allocation;
-  DCHECK(Is(bits, kNumber));
+  DCHECK(Is(SEMANTIC(bits), kNumber));
   const Boundary* mins = Boundaries();
   bool mz = SEMANTIC(bits & kMinusZero);
   if (BitsetType::Is(SEMANTIC(mins[BoundariesSize() - 1].bits), bits)) {
@@ -482,22 +478,55 @@ bool TypeImpl<Config>::SimplyEquals(TypeImpl* that) {
 }
 
 
+template <class Config>
+typename TypeImpl<Config>::bitset TypeImpl<Config>::Representation() {
+  return REPRESENTATION(this->BitsetLub());
+}
+
+
 // Check if [this] <= [that].
 template<class Config>
 bool TypeImpl<Config>::SlowIs(TypeImpl* that) {
   DisallowHeapAllocation no_allocation;
 
+  // Fast bitset cases
   if (that->IsBitset()) {
     return BitsetType::Is(this->BitsetLub(), that->AsBitset());
   }
+
   if (this->IsBitset()) {
     return BitsetType::Is(this->AsBitset(), that->BitsetGlb());
   }
 
+  // Check the representations.
+  if (!BitsetType::Is(Representation(), that->Representation())) {
+    return false;
+  }
+
+  // Check the semantic part.
+  return SemanticIs(that);
+}
+
+
+// Check if SEMANTIC([this]) <= SEMANTIC([that]). The result of the method
+// should be independent of the representation axis of the types.
+template <class Config>
+bool TypeImpl<Config>::SemanticIs(TypeImpl* that) {
+  DisallowHeapAllocation no_allocation;
+
+  if (this == that) return true;
+
+  if (that->IsBitset()) {
+    return BitsetType::Is(SEMANTIC(this->BitsetLub()), that->AsBitset());
+  }
+  if (this->IsBitset()) {
+    return BitsetType::Is(SEMANTIC(this->AsBitset()), that->BitsetGlb());
+  }
+
   // (T1 \/ ... \/ Tn) <= T  if  (T1 <= T) /\ ... /\ (Tn <= T)
   if (this->IsUnion()) {
     for (int i = 0, n = this->AsUnion()->Length(); i < n; ++i) {
-      if (!this->AsUnion()->Get(i)->Is(that)) return false;
+      if (!this->AsUnion()->Get(i)->SemanticIs(that)) return false;
     }
     return true;
   }
@@ -505,7 +534,7 @@ bool TypeImpl<Config>::SlowIs(TypeImpl* that) {
   // T <= (T1 \/ ... \/ Tn)  if  (T <= T1) \/ ... \/ (T <= Tn)
   if (that->IsUnion()) {
     for (int i = 0, n = that->AsUnion()->Length(); i < n; ++i) {
-      if (this->Is(that->AsUnion()->Get(i))) return true;
+      if (this->SemanticIs(that->AsUnion()->Get(i)->unhandle())) return true;
       if (i > 1 && this->IsRange()) return false;  // Shortcut.
     }
     return false;
@@ -558,10 +587,22 @@ template<class Config>
 bool TypeImpl<Config>::Maybe(TypeImpl* that) {
   DisallowHeapAllocation no_allocation;
 
+  // Take care of the representation part (and also approximate
+  // the semantic part).
+  if (!BitsetType::IsInhabited(this->BitsetLub() & that->BitsetLub()))
+    return false;
+
+  return SemanticMaybe(that);
+}
+
+template <class Config>
+bool TypeImpl<Config>::SemanticMaybe(TypeImpl* that) {
+  DisallowHeapAllocation no_allocation;
+
   // (T1 \/ ... \/ Tn) overlaps T  if  (T1 overlaps T) \/ ... \/ (Tn overlaps T)
   if (this->IsUnion()) {
     for (int i = 0, n = this->AsUnion()->Length(); i < n; ++i) {
-      if (this->AsUnion()->Get(i)->Maybe(that)) return true;
+      if (this->AsUnion()->Get(i)->SemanticMaybe(that)) return true;
     }
     return false;
   }
@@ -569,12 +610,12 @@ bool TypeImpl<Config>::Maybe(TypeImpl* that) {
   // T overlaps (T1 \/ ... \/ Tn)  if  (T overlaps T1) \/ ... \/ (T overlaps Tn)
   if (that->IsUnion()) {
     for (int i = 0, n = that->AsUnion()->Length(); i < n; ++i) {
-      if (this->Maybe(that->AsUnion()->Get(i))) return true;
+      if (this->SemanticMaybe(that->AsUnion()->Get(i)->unhandle())) return true;
     }
     return false;
   }
 
-  if (!BitsetType::IsInhabited(this->BitsetLub() & that->BitsetLub()))
+  if (!BitsetType::SemanticIsInhabited(this->BitsetLub() & that->BitsetLub()))
     return false;
 
   if (this->IsBitset() && that->IsBitset()) return true;
@@ -599,7 +640,7 @@ bool TypeImpl<Config>::Maybe(TypeImpl* that) {
     }
   }
   if (that->IsRange()) {
-    return that->Maybe(this);  // This case is handled above.
+    return that->SemanticMaybe(this);  // This case is handled above.
   }
 
   if (this->IsBitset() || that->IsBitset()) return true;
@@ -639,28 +680,27 @@ bool TypeImpl<Config>::UnionType::Wellformed() {
   DisallowHeapAllocation no_allocation;
   // This checks the invariants of the union representation:
   // 1. There are at least two elements.
-  // 2. At most one element is a bitset, and it must be the first one.
-  // 3. At most one element is a range, and it must be the second one
-  //    (even when the first element is not a bitset).
+  // 2. The first element is a bitset, no other element is a bitset.
+  // 3. At most one element is a range, and it must be the second one.
   // 4. No element is itself a union.
-  // 5. No element is a subtype of any other.
+  // 5. No element (except the bitset) is a subtype of any other.
   // 6. If there is a range, then the bitset type does not contain
   //    plain number bits.
   DCHECK(this->Length() >= 2);  // (1)
-
-  bitset number_bits = this->Get(0)->IsBitset()
-      ? BitsetType::NumberBits(this->Get(0)->AsBitset()) : 0;
-  USE(number_bits);
+  DCHECK(this->Get(0)->IsBitset());  // (2a)
 
   for (int i = 0; i < this->Length(); ++i) {
-    if (i != 0) DCHECK(!this->Get(i)->IsBitset());  // (2)
+    if (i != 0) DCHECK(!this->Get(i)->IsBitset());  // (2b)
     if (i != 1) DCHECK(!this->Get(i)->IsRange());   // (3)
     DCHECK(!this->Get(i)->IsUnion());               // (4)
     for (int j = 0; j < this->Length(); ++j) {
-      if (i != j) DCHECK(!this->Get(i)->Is(this->Get(j)));  // (5)
+      if (i != j && i != 0)
+        DCHECK(!this->Get(i)->SemanticIs(this->Get(j)->unhandle()));  // (5)
     }
   }
-  DCHECK(!this->Get(1)->IsRange() || (number_bits == 0));  // (6)
+  DCHECK(!this->Get(1)->IsRange() ||
+         (BitsetType::NumberBits(this->Get(0)->AsBitset()) ==
+          BitsetType::kNone));  // (6)
   return true;
 }
 
@@ -679,12 +719,10 @@ static bool AddIsSafe(int x, int y) {
 template<class Config>
 typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Intersect(
     TypeHandle type1, TypeHandle type2, Region* region) {
-  bitset bits = type1->BitsetGlb() & type2->BitsetGlb();
-  if (!BitsetType::IsInhabited(bits)) bits = BitsetType::kNone;
 
   // Fast case: bit sets.
   if (type1->IsBitset() && type2->IsBitset()) {
-    return BitsetType::New(bits, region);
+    return BitsetType::New(type1->AsBitset() & type2->AsBitset(), region);
   }
 
   // Fast case: top or bottom types.
@@ -696,6 +734,26 @@ typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Intersect(
   if (type2->Is(type1)) return type2;
 
   // Slow case: create union.
+
+  // Figure out the representation of the result first.
+  // The rest of the method should not change this representation and
+  // it should not make any decisions based on representations (i.e.,
+  // it should only use the semantic part of types).
+  const bitset representation =
+      type1->Representation() & type2->Representation();
+
+  // Semantic subtyping check - this is needed for consistency with the
+  // semi-fast case above - we should behave the same way regardless of
+  // representations. Intersection with a universal bitset should only update
+  // the representations.
+  if (type1->SemanticIs(type2->unhandle())) {
+    type2 = Any(region);
+  } else if (type2->SemanticIs(type1->unhandle())) {
+    type1 = Any(region);
+  }
+
+  bitset bits =
+      SEMANTIC(type1->BitsetGlb() & type2->BitsetGlb()) | representation;
   int size1 = type1->IsUnion() ? type1->AsUnion()->Length() : 1;
   int size2 = type2->IsUnion() ? type2->AsUnion()->Length() : 1;
   if (!AddIsSafe(size1, size2)) return Any(region);
@@ -707,8 +765,6 @@ typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Intersect(
 
   // Deal with bitsets.
   result->Set(size++, BitsetType::New(bits, region));
-  // Insert a placeholder for the range.
-  result->Set(size++, None(region));
 
   Limits lims = Limits::Empty(region);
   size = IntersectAux(type1, type2, result, size, &lims, region);
@@ -716,14 +772,12 @@ typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Intersect(
   // If the range is not empty, then insert it into the union and
   // remove the number bits from the bitset.
   if (!IsEmpty(lims)) {
-    size = UpdateRange(RangeType::New(lims, region), result, size, region);
+    size = UpdateRange(RangeType::New(lims, representation, region), result,
+                       size, region);
 
     // Remove the number bits.
     bitset number_bits = BitsetType::NumberBits(bits);
     bits &= ~number_bits;
-    if (SEMANTIC(bits) == BitsetType::kNone) {
-      bits = BitsetType::kNone;
-    }
     result->Set(0, BitsetType::New(bits, region));
   }
   return NormalizeUnion(result, size);
@@ -733,18 +787,17 @@ typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Intersect(
 template<class Config>
 int TypeImpl<Config>::UpdateRange(
     RangeHandle range, UnionHandle result, int size, Region* region) {
-  TypeHandle old_range = result->Get(1);
-  DCHECK(old_range->IsRange() || old_range->IsNone());
-  if (range->Is(old_range)) return size;
-  if (!old_range->Is(range->unhandle())) {
-    range = RangeType::New(
-        Union(Limits(range->AsRange()), Limits(old_range->AsRange())), region);
-  }
+  if (size == 1) {
+    result->Set(size++, range);
+  } else {
+    // Make space for the range.
+    result->Set(size++, result->Get(1));
     result->Set(1, range);
+  }
 
   // Remove any components that just got subsumed.
   for (int i = 2; i < size; ) {
-    if (result->Get(i)->Is(range->unhandle())) {
+    if (result->Get(i)->SemanticIs(range->unhandle())) {
       result->Set(i, result->Get(--size));
     } else {
       ++i;
@@ -757,15 +810,13 @@ int TypeImpl<Config>::UpdateRange(
 template <class Config>
 typename TypeImpl<Config>::Limits TypeImpl<Config>::ToLimits(bitset bits,
                                                              Region* region) {
-  bitset representation = REPRESENTATION(bits);
   bitset number_bits = BitsetType::NumberBits(bits);
 
-  if (representation == BitsetType::kNone && number_bits == BitsetType::kNone) {
+  if (number_bits == BitsetType::kNone) {
     return Limits::Empty(region);
   }
 
-  return Limits(BitsetType::Min(number_bits), BitsetType::Max(number_bits),
-                representation);
+  return Limits(BitsetType::Min(number_bits), BitsetType::Max(number_bits));
 }
 
 
@@ -797,7 +848,7 @@ int TypeImpl<Config>::IntersectAux(TypeHandle lhs, TypeHandle rhs,
     return size;
   }
 
-  if (!BitsetType::IsInhabited(lhs->BitsetLub() & rhs->BitsetLub())) {
+  if (!BitsetType::SemanticIsInhabited(lhs->BitsetLub() & rhs->BitsetLub())) {
     return size;
   }
 
@@ -857,9 +908,8 @@ typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::NormalizeRangeAndBitset(
 
   // If the range is contained within the bitset, return an empty range
   // (but make sure we take the representation).
-  bitset range_lub = range->BitsetLub();
+  bitset range_lub = SEMANTIC(range->BitsetLub());
   if (BitsetType::Is(BitsetType::NumberBits(range_lub), *bits)) {
-    *bits |= range_lub;
     return None(region);
   }
 
@@ -870,19 +920,10 @@ typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::NormalizeRangeAndBitset(
   double range_min = range->Min();
   double range_max = range->Max();
 
-  bitset range_representation = REPRESENTATION(range->BitsetLub());
-  bitset bits_representation = REPRESENTATION(*bits);
-  bitset representation =
-      (bits_representation | range_representation) & BitsetType::kNumber;
-
   // Remove the number bits from the bitset, they would just confuse us now.
   *bits &= ~number_bits;
-  if (bits_representation == *bits) {
-    *bits = BitsetType::kNone;
-  }
 
-  if (representation == range_representation && range_min <= bitset_min &&
-      range_max >= bitset_max) {
+  if (range_min <= bitset_min && range_max >= bitset_max) {
     // Bitset is contained within the range, just return the range.
     return range;
   }
@@ -894,14 +935,13 @@ typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::NormalizeRangeAndBitset(
     range_max = bitset_max;
   }
   return RangeType::New(range_min, range_max,
-                        BitsetType::New(representation, region), region);
+                        BitsetType::New(BitsetType::kNone, region), region);
 }
 
 
 template<class Config>
 typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Union(
     TypeHandle type1, TypeHandle type2, Region* region) {
-
   // Fast case: bit sets.
   if (type1->IsBitset() && type2->IsBitset()) {
     return BitsetType::New(type1->AsBitset() | type2->AsBitset(), region);
@@ -915,6 +955,13 @@ typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Union(
   if (type1->Is(type2)) return type2;
   if (type2->Is(type1)) return type1;
 
+  // Figure out the representation of the result.
+  // The rest of the method should not change this representation and
+  // it should make any decisions based on representations (i.e.,
+  // it should only use the semantic part of types).
+  const bitset representation =
+      type1->Representation() | type2->Representation();
+
   // Slow case: create union.
   int size1 = type1->IsUnion() ? type1->AsUnion()->Length() : 1;
   int size2 = type2->IsUnion() ? type2->AsUnion()->Length() : 1;
@@ -926,7 +973,7 @@ typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Union(
   size = 0;
 
   // Compute the new bitset.
-  bitset new_bitset = type1->BitsetGlb() | type2->BitsetGlb();
+  bitset new_bitset = SEMANTIC(type1->BitsetGlb() | type2->BitsetGlb());
 
   // Deal with ranges.
   TypeHandle range = None(region);
@@ -934,16 +981,17 @@ typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Union(
   RangeType* range2 = type2->GetRange();
   if (range1 != NULL && range2 != NULL) {
     Limits lims = Union(Limits(range1), Limits(range2));
-    RangeHandle union_range = RangeType::New(lims, region);
+    RangeHandle union_range = RangeType::New(lims, representation, region);
     range = NormalizeRangeAndBitset(union_range, &new_bitset, region);
   } else if (range1 != NULL) {
     range = NormalizeRangeAndBitset(handle(range1), &new_bitset, region);
   } else if (range2 != NULL) {
     range = NormalizeRangeAndBitset(handle(range2), &new_bitset, region);
   }
+  new_bitset = SEMANTIC(new_bitset) | representation;
   TypeHandle bits = BitsetType::New(new_bitset, region);
   result->Set(size++, bits);
-  result->Set(size++, range);
+  if (!range->IsNone()) result->Set(size++, range);
 
   size = AddToUnion(type1, result, size, region);
   size = AddToUnion(type2, result, size, region);
@@ -964,7 +1012,7 @@ int TypeImpl<Config>::AddToUnion(
     return size;
   }
   for (int i = 0; i < size; ++i) {
-    if (type->Is(result->Get(i))) return size;
+    if (type->SemanticIs(result->Get(i)->unhandle())) return size;
   }
   result->Set(size++, type);
   return size;
@@ -974,22 +1022,47 @@ int TypeImpl<Config>::AddToUnion(
 template<class Config>
 typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::NormalizeUnion(
     UnionHandle unioned, int size) {
-  DCHECK(size >= 2);
-  // If range is subsumed by bitset, use its place for a different type.
-  if (unioned->Get(1)->Is(unioned->Get(0))) {
-    unioned->Set(1, unioned->Get(--size));
+  DCHECK(size >= 1);
+  DCHECK(unioned->Get(0)->IsBitset());
+  // If the union has just one element, return it.
+  if (size == 1) {
+    return unioned->Get(0);
+  }
+  bitset bits = unioned->Get(0)->AsBitset();
+  // If the union only consists of a range, we can get rid of the union.
+  if (size == 2 && SEMANTIC(bits) == BitsetType::kNone) {
+    bitset representation = REPRESENTATION(bits);
+    if (representation == unioned->Get(1)->Representation()) {
+      return unioned->Get(1);
     }
-  // If bitset is None, use its place for a different type.
-  if (size >= 2 && unioned->Get(0)->IsNone()) {
-    unioned->Set(0, unioned->Get(--size));
+    // TODO(jarin) If the element at 1 is range of constant, slap
+    // the representation on it and return that.
   }
-  if (size == 1) return unioned->Get(0);
   unioned->Shrink(size);
   SLOW_DCHECK(unioned->Wellformed());
   return unioned;
 }
 
 
+// -----------------------------------------------------------------------------
+// Component extraction
+
+// static
+template <class Config>
+typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Representation(
+    TypeHandle t, Region* region) {
+  return BitsetType::New(t->Representation(), region);
+}
+
+
+// static
+template <class Config>
+typename TypeImpl<Config>::TypeHandle TypeImpl<Config>::Semantic(
+    TypeHandle t, Region* region) {
+  return Intersect(t, BitsetType::New(BitsetType::kSemantic, region), region);
+}
+
+
 // -----------------------------------------------------------------------------
 // Iteration.
 

src/types.h

@@ -430,8 +430,11 @@ class TypeImpl : public Config::Base {
     return Of(*value, region);
   }
 
-  // Predicates.
+  // Extraction of components.
+  static TypeHandle Representation(TypeHandle t, Region* region);
+  static TypeHandle Semantic(TypeHandle t, Region* region);
 
+  // Predicates.
   bool IsInhabited() { return BitsetType::IsInhabited(this->BitsetLub()); }
 
   bool Is(TypeImpl* that) { return this == that || this->SlowIs(that); }
@@ -563,12 +566,16 @@ class TypeImpl : public Config::Base {
   }
   UnionType* AsUnion() { return UnionType::cast(this); }
 
+  bitset Representation();
+
   // Auxiliary functions.
+  bool SemanticMaybe(TypeImpl* that);
 
   bitset BitsetGlb() { return BitsetType::Glb(this); }
   bitset BitsetLub() { return BitsetType::Lub(this); }
 
   bool SlowIs(TypeImpl* that);
+  bool SemanticIs(TypeImpl* that);
 
   static bool IsInteger(double x) {
     return nearbyint(x) == x && !i::IsMinusZero(x);  // Allows for infinities.
@@ -580,16 +587,9 @@ class TypeImpl : public Config::Base {
   struct Limits {
     double min;
     double max;
-    bitset representation;
-    Limits(double min, double max, bitset representation)
-        : min(min), max(max), representation(representation) {}
-    explicit Limits(RangeType* range)
-        : min(range->Min()),
-          max(range->Max()),
-          representation(REPRESENTATION(range->Bound())) {}
-    static Limits Empty(Region* region) {
-      return Limits(1, 0, BitsetType::kNone);
-    }
+    Limits(double min, double max) : min(min), max(max) {}
+    explicit Limits(RangeType* range) : min(range->Min()), max(range->Max()) {}
+    static Limits Empty(Region* region) { return Limits(1, 0); }
   };
 
   static bool IsEmpty(Limits lim);
@@ -649,11 +649,13 @@ class TypeImpl<Config>::BitsetType : public TypeImpl<Config> {
     if (FLAG_enable_slow_asserts) CheckNumberBits(bits);
     return Config::from_bitset(bits, region);
   }
-  // TODO(neis): Eventually allow again for types with empty semantics
-  // part and modify intersection and possibly subtyping accordingly.
 
   static bool IsInhabited(bitset bits) {
-    return bits & kSemantic;
+    return SEMANTIC(bits) != kNone && REPRESENTATION(bits) != kNone;
+  }
+
+  static bool SemanticIsInhabited(bitset bits) {
+    return SEMANTIC(bits) != kNone;
   }
 
   static bool Is(bitset bits1, bitset bits2) {
@@ -855,8 +857,8 @@ class TypeImpl<Config>::RangeType : public TypeImpl<Config> {
     return Config::template cast<RangeType>(Config::from_range(range));
   }
 
-  static RangeHandle New(Limits lim, Region* region) {
-    return New(lim.min, lim.max, BitsetType::New(lim.representation, region),
+  static RangeHandle New(Limits lim, bitset representation, Region* region) {
+    return New(lim.min, lim.max, BitsetType::New(representation, region),
                region);
   }
 
@@ -866,7 +868,6 @@ class TypeImpl<Config>::RangeType : public TypeImpl<Config> {
   }
 };
 // TODO(neis): Also cache min and max values.
-// TODO(neis): Allow restricting the representation.
 
 
 // -----------------------------------------------------------------------------

test/cctest/cctest.gyp

@@ -88,7 +88,6 @@
         'compiler/test-run-stackcheck.cc',
         'compiler/test-run-variables.cc',
         'compiler/test-simplified-lowering.cc',
-        'compiler/test-typer.cc',
         'cctest.cc',
         'gay-fixed.cc',
         'gay-precision.cc',

test/cctest/test-types.cc

@@ -109,7 +109,8 @@ struct Tests : Rep {
       : isolate(CcTest::i_isolate()),
         scope(isolate),
         zone(),
-        T(Rep::ToRegion(&zone, isolate), isolate) {}
+        T(Rep::ToRegion(&zone, isolate), isolate,
+          isolate->random_number_generator()) {}
 
   bool Equal(TypeHandle type1, TypeHandle type2) {
     return
@@ -234,14 +235,82 @@ struct Tests : Rep {
       for (TypeIterator it2 = T.types.begin(); it2 != T.types.end(); ++it2) {
         TypeHandle type1 = *it1;
         TypeHandle type2 = *it2;
-        TypeHandle intersect12 = T.Intersect(type1, type2);
         if (this->IsBitset(type1) && this->IsBitset(type2)) {
+          TypeHandle intersect12 = T.Intersect(type1, type2);
           bitset bits = this->AsBitset(type1) & this->AsBitset(type2);
-          CHECK(
-              (Rep::BitsetType::IsInhabited(bits) ? bits : 0) ==
-              this->AsBitset(intersect12));
+          CHECK(bits == this->AsBitset(intersect12));
+        }
+      }
     }
   }
+
+  void PointwiseRepresentation() {
+    // Check we can decompose type into semantics and representation and
+    // then compose it back to get an equivalent type.
+    int counter = 0;
+    for (TypeIterator it1 = T.types.begin(); it1 != T.types.end(); ++it1) {
+      counter++;
+      printf("Counter: %i\n", counter);
+      fflush(stdout);
+      TypeHandle type1 = *it1;
+      TypeHandle representation = T.Representation(type1);
+      TypeHandle semantic = T.Semantic(type1);
+      TypeHandle composed = T.Union(representation, semantic);
+      CHECK(type1->Equals(composed));
+    }
+
+    // Pointwiseness of Union.
+    for (TypeIterator it1 = T.types.begin(); it1 != T.types.end(); ++it1) {
+      for (TypeIterator it2 = T.types.begin(); it2 != T.types.end(); ++it2) {
+        TypeHandle type1 = *it1;
+        TypeHandle type2 = *it2;
+        TypeHandle representation1 = T.Representation(type1);
+        TypeHandle semantic1 = T.Semantic(type1);
+        TypeHandle representation2 = T.Representation(type2);
+        TypeHandle semantic2 = T.Semantic(type2);
+        TypeHandle direct_union = T.Union(type1, type2);
+        TypeHandle representation_union =
+            T.Union(representation1, representation2);
+        TypeHandle semantic_union = T.Union(semantic1, semantic2);
+        TypeHandle composed_union =
+            T.Union(representation_union, semantic_union);
+        CHECK(direct_union->Equals(composed_union));
+      }
+    }
+
+    // Pointwiseness of Intersect.
+    for (TypeIterator it1 = T.types.begin(); it1 != T.types.end(); ++it1) {
+      for (TypeIterator it2 = T.types.begin(); it2 != T.types.end(); ++it2) {
+        TypeHandle type1 = *it1;
+        TypeHandle type2 = *it2;
+        TypeHandle representation1 = T.Representation(type1);
+        TypeHandle semantic1 = T.Semantic(type1);
+        TypeHandle representation2 = T.Representation(type2);
+        TypeHandle semantic2 = T.Semantic(type2);
+        TypeHandle direct_intersection = T.Intersect(type1, type2);
+        TypeHandle representation_intersection =
+            T.Intersect(representation1, representation2);
+        TypeHandle semantic_intersection = T.Intersect(semantic1, semantic2);
+        TypeHandle composed_intersection =
+            T.Union(representation_intersection, semantic_intersection);
+        CHECK(direct_intersection->Equals(composed_intersection));
+      }
+    }
+
+    // Pointwiseness of Is.
+    for (TypeIterator it1 = T.types.begin(); it1 != T.types.end(); ++it1) {
+      for (TypeIterator it2 = T.types.begin(); it2 != T.types.end(); ++it2) {
+        TypeHandle type1 = *it1;
+        TypeHandle type2 = *it2;
+        TypeHandle representation1 = T.Representation(type1);
+        TypeHandle semantic1 = T.Semantic(type1);
+        TypeHandle representation2 = T.Representation(type2);
+        TypeHandle semantic2 = T.Semantic(type2);
+        bool representation_is = representation1->Is(representation2);
+        bool semantic_is = semantic1->Is(semantic2);
+        bool direct_is = type1->Is(type2);
+        CHECK(direct_is == (semantic_is && representation_is));
+      }
     }
   }
 
@@ -657,11 +726,11 @@ struct Tests : Rep {
       }
     }
 
-    // Rangification: If T->Is(Range(-inf,+inf)) and !T->Is(None), then
+    // Rangification: If T->Is(Range(-inf,+inf)) and T is inhabited, then
     // T->Is(Range(T->Min(), T->Max())).
     for (TypeIterator it = T.types.begin(); it != T.types.end(); ++it) {
       TypeHandle type = *it;
-      CHECK(!(type->Is(T.Integer) && !type->Is(T.None)) ||
+      CHECK(!type->Is(T.Integer) || !type->IsInhabited() ||
             type->Is(T.Range(type->Min(), type->Max())));
     }
   }
@@ -801,7 +870,7 @@ struct Tests : Rep {
               (type1->IsContext() && type2->IsContext()) ||
               (type1->IsArray() && type2->IsArray()) ||
               (type1->IsFunction() && type2->IsFunction()) ||
-              type1->Equals(T.None));
+              !type1->IsInhabited());
       }
     }
   }
@@ -1305,7 +1374,7 @@ struct Tests : Rep {
     CheckDisjoint(T.SignedFunction1, T.MethodFunction);
     CheckOverlap(T.ObjectConstant1, T.ObjectClass);  // !!!
     CheckOverlap(T.ObjectConstant2, T.ObjectClass);  // !!!
-    CheckOverlap(T.NumberClass, T.Intersect(T.Number, T.Untagged));  // !!!
+    CheckOverlap(T.NumberClass, T.Intersect(T.Number, T.Tagged));  // !!!
   }
 
   void Union1() {
@@ -1694,24 +1763,24 @@ struct Tests : Rep {
 
     // Bitset-class
     CheckEqual(T.Intersect(T.ObjectClass, T.Object), T.ObjectClass);
-    CheckEqual(T.Intersect(T.ObjectClass, T.Array), T.None);
-    CheckEqual(T.Intersect(T.ObjectClass, T.Number), T.None);
+    CheckEqual(T.Semantic(T.Intersect(T.ObjectClass, T.Array)), T.None);
+    CheckEqual(T.Semantic(T.Intersect(T.ObjectClass, T.Number)), T.None);
 
     // Bitset-array
     CheckEqual(T.Intersect(T.NumberArray, T.Object), T.NumberArray);
-    CheckEqual(T.Intersect(T.AnyArray, T.Proxy), T.None);
+    CheckEqual(T.Semantic(T.Intersect(T.AnyArray, T.Proxy)), T.None);
 
     // Bitset-function
     CheckEqual(T.Intersect(T.MethodFunction, T.Object), T.MethodFunction);
-    CheckEqual(T.Intersect(T.NumberFunction1, T.Proxy), T.None);
+    CheckEqual(T.Semantic(T.Intersect(T.NumberFunction1, T.Proxy)), T.None);
 
     // Bitset-union
     CheckEqual(
         T.Intersect(T.Object, T.Union(T.ObjectConstant1, T.ObjectClass)),
         T.Union(T.ObjectConstant1, T.ObjectClass));
-    CHECK(
-        !T.Intersect(T.Union(T.ArrayClass, T.ObjectConstant1), T.Number)
-            ->IsInhabited());
+    CheckEqual(T.Semantic(T.Intersect(T.Union(T.ArrayClass, T.ObjectConstant1),
+                                      T.Number)),
+               T.None);
 
     // Class-constant
     CHECK(T.Intersect(T.ObjectConstant1, T.ObjectClass)->IsInhabited());  // !!!
@@ -1867,8 +1936,9 @@ struct Tests : Rep {
 
   template<class Type2, class TypeHandle2, class Region2, class Rep2>
   void Convert() {
-    Types<Type2, TypeHandle2, Region2> T2(
-        Rep2::ToRegion(&zone, isolate), isolate);
+    Types<Type2, TypeHandle2, Region2> T2(Rep2::ToRegion(&zone, isolate),
+                                          isolate,
+                                          isolate->random_number_generator());
     for (TypeIterator it = T.types.begin(); it != T.types.end(); ++it) {
       TypeHandle type1 = *it;
       TypeHandle2 type2 = T2.template Convert<Type>(type1);
@@ -1901,6 +1971,13 @@ TEST(IsSomeType) {
 }
 
 
+TEST(PointwiseRepresentation) {
+  CcTest::InitializeVM();
+  // ZoneTests().PointwiseRepresentation();
+  HeapTests().PointwiseRepresentation();
+}
+
+
 TEST(BitsetType) {
   CcTest::InitializeVM();
   ZoneTests().Bitset();

test/cctest/types-fuzz.h

@@ -28,6 +28,7 @@
 #ifndef V8_TEST_CCTEST_TYPES_H_
 #define V8_TEST_CCTEST_TYPES_H_
 
+#include "src/base/utils/random-number-generator.h"
 #include "src/v8.h"
 
 namespace v8 {
@@ -37,8 +38,8 @@ namespace internal {
 template<class Type, class TypeHandle, class Region>
 class Types {
  public:
-  Types(Region* region, Isolate* isolate)
-      : region_(region), rng_(isolate->random_number_generator()) {
+  Types(Region* region, Isolate* isolate, v8::base::RandomNumberGenerator* rng)
+      : region_(region), rng_(rng) {
     #define DECLARE_TYPE(name, value) \
       name = Type::name(region);      \
       types.push_back(name);
@@ -132,6 +133,10 @@ class Types {
   #define DECLARE_TYPE(name, value) TypeHandle name;
   PROPER_BITSET_TYPE_LIST(DECLARE_TYPE)
   #undef DECLARE_TYPE
+
+#define DECLARE_TYPE(name, value) TypeHandle Mask##name##ForTesting;
+  MASK_BITSET_TYPE_LIST(DECLARE_TYPE)
+#undef DECLARE_TYPE
   TypeHandle SignedSmall;
   TypeHandle UnsignedSmall;
 
@@ -212,10 +217,19 @@ class Types {
   TypeHandle Union(TypeHandle t1, TypeHandle t2) {
     return Type::Union(t1, t2, region_);
   }
+
   TypeHandle Intersect(TypeHandle t1, TypeHandle t2) {
     return Type::Intersect(t1, t2, region_);
   }
 
+  TypeHandle Representation(TypeHandle t) {
+    return Type::Representation(t, region_);
+  }
+
+  // TypeHandle Semantic(TypeHandle t) { return Intersect(t,
+  // MaskSemanticForTesting); }
+  TypeHandle Semantic(TypeHandle t) { return Type::Semantic(t, region_); }
+
   template<class Type2, class TypeHandle2>
   TypeHandle Convert(TypeHandle2 t) {
     return Type::template Convert<Type2>(t, region_);

test/cctest/compiler/test-typer.cc → test/unittests/compiler/typer-unittest.cc

-// Copyright 2014 the V8 project authors. All rights reserved.
+// Copyright 2015 the V8 project authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
@@ -7,27 +7,22 @@
 #include "src/codegen.h"
 #include "src/compiler/js-operator.h"
 #include "src/compiler/node-properties.h"
-#include "src/compiler/typer.h"
-#include "test/cctest/cctest.h"
-#include "test/cctest/compiler/graph-builder-tester.h"
 #include "test/cctest/types-fuzz.h"
+#include "test/unittests/compiler/graph-unittest.h"
 
 using namespace v8::internal;
 using namespace v8::internal::compiler;
 
 
 // TODO(titzer): generate a large set of deterministic inputs for these tests.
-class TyperTester : public HandleAndZoneScope, public GraphAndBuilders {
+class TyperTest : public TypedGraphTest {
  public:
-  TyperTester()
-      : GraphAndBuilders(main_zone()),
-        types_(main_zone(), isolate()),
-        typer_(isolate(), graph(), MaybeHandle<Context>()),
-        javascript_(main_zone()) {
-    Node* s = graph()->NewNode(common()->Start(3));
-    graph()->SetStart(s);
+  TyperTest()
+      : TypedGraphTest(3),
+        types_(zone(), isolate(), random_number_generator()),
+        javascript_(zone()) {
     context_node_ = graph()->NewNode(common()->Parameter(2), graph()->start());
-    rng_ = isolate()->random_number_generator();
+    rng_ = random_number_generator();
 
     integers.push_back(0);
     integers.push_back(0);
@@ -54,28 +49,19 @@ class TyperTester : public HandleAndZoneScope, public GraphAndBuilders {
   }
 
   Types<Type, Type*, Zone> types_;
-  Typer typer_;
   JSOperatorBuilder javascript_;
   Node* context_node_;
   v8::base::RandomNumberGenerator* rng_;
   std::vector<double> integers;
   std::vector<double> int32s;
 
-  Isolate* isolate() { return main_isolate(); }
-  Graph* graph() { return main_graph_; }
-  CommonOperatorBuilder* common() { return &main_common_; }
-
-  Node* Parameter(int index = 0) {
-    return graph()->NewNode(common()->Parameter(index), graph()->start());
-  }
-
   Type* TypeBinaryOp(const Operator* op, Type* lhs, Type* rhs) {
     Node* p0 = Parameter(0);
     Node* p1 = Parameter(1);
     NodeProperties::SetBounds(p0, Bounds(lhs));
     NodeProperties::SetBounds(p1, Bounds(rhs));
-    Node* n = graph()->NewNode(
-        op, p0, p1, context_node_, graph()->start(), graph()->start());
+    Node* n = graph()->NewNode(op, p0, p1, context_node_, graph()->start(),
+                               graph()->start());
     return NodeProperties::GetBounds(n).upper;
   }
 
@@ -88,14 +74,17 @@ class TyperTester : public HandleAndZoneScope, public GraphAndBuilders {
 
   Type* NewRange(double i, double j) {
     if (i > j) std::swap(i, j);
-    return Type::Range(i, j, main_zone());
+    return Type::Range(i, j, zone());
   }
 
   double RandomInt(double min, double max) {
     switch (rng_->NextInt(4)) {
-      case 0: return min;
-      case 1: return max;
-      default: break;
+      case 0:
+        return min;
+      case 1:
+        return max;
+      default:
+        break;
     }
     if (min == +V8_INFINITY) return +V8_INFINITY;
     if (max == -V8_INFINITY) return -V8_INFINITY;
@@ -130,8 +119,8 @@ class TyperTester : public HandleAndZoneScope, public GraphAndBuilders {
             for (int x2 = rmin; x2 < rmin + width; x2++) {
               double result_value = opfun(x1, x2);
               Type* result_type = Type::Constant(
-                  isolate()->factory()->NewNumber(result_value), main_zone());
-              CHECK(result_type->Is(expected_type));
+                  isolate()->factory()->NewNumber(result_value), zone());
+              EXPECT_TRUE(result_type->Is(expected_type));
             }
           }
         }
@@ -151,8 +140,8 @@ class TyperTester : public HandleAndZoneScope, public GraphAndBuilders {
         double x2 = RandomInt(r2);
         double result_value = opfun(x1, x2);
         Type* result_type = Type::Constant(
-            isolate()->factory()->NewNumber(result_value), main_zone());
-        CHECK(result_type->Is(expected_type));
+            isolate()->factory()->NewNumber(result_value), zone());
+        EXPECT_TRUE(result_type->Is(expected_type));
       }
     }
   }
@@ -170,8 +159,8 @@ class TyperTester : public HandleAndZoneScope, public GraphAndBuilders {
         Type* result_type =
             Type::Constant(result_value ? isolate()->factory()->true_value()
                                         : isolate()->factory()->false_value(),
-                           main_zone());
-        CHECK(result_type->Is(expected_type));
+                           zone());
+        EXPECT_TRUE(result_type->Is(expected_type));
       }
     }
   }
@@ -187,8 +176,8 @@ class TyperTester : public HandleAndZoneScope, public GraphAndBuilders {
         int32_t x2 = static_cast<int32_t>(RandomInt(r2));
         double result_value = opfun(x1, x2);
         Type* result_type = Type::Constant(
-            isolate()->factory()->NewNumber(result_value), main_zone());
-        CHECK(result_type->Is(expected_type));
+            isolate()->factory()->NewNumber(result_value), zone());
+        EXPECT_TRUE(result_type->Is(expected_type));
       }
     }
   }
@@ -206,20 +195,26 @@ class TyperTester : public HandleAndZoneScope, public GraphAndBuilders {
       Type* type1 = types_.Fuzz();
       Type* type2 = types_.Fuzz();
       Type* type = TypeBinaryOp(op, type1, type2);
-      Type* subtype1 = RandomSubtype(type1);;
-      Type* subtype2 = RandomSubtype(type2);;
+      Type* subtype1 = RandomSubtype(type1);
+      ;
+      Type* subtype2 = RandomSubtype(type2);
+      ;
       Type* subtype = TypeBinaryOp(op, subtype1, subtype2);
-      CHECK(subtype->Is(type));
+      EXPECT_TRUE(subtype->Is(type));
     }
   }
 };
 
 
-static int32_t shift_left(int32_t x, int32_t y) { return x << y; }
-static int32_t shift_right(int32_t x, int32_t y) { return x >> y; }
-static int32_t bit_or(int32_t x, int32_t y) { return x | y; }
-static int32_t bit_and(int32_t x, int32_t y) { return x & y; }
-static int32_t bit_xor(int32_t x, int32_t y) { return x ^ y; }
+namespace {
+
+int32_t shift_left(int32_t x, int32_t y) { return x << y; }
+int32_t shift_right(int32_t x, int32_t y) { return x >> y; }
+int32_t bit_or(int32_t x, int32_t y) { return x | y; }
+int32_t bit_and(int32_t x, int32_t y) { return x & y; }
+int32_t bit_xor(int32_t x, int32_t y) { return x ^ y; }
+
+}  // namespace
 
 
 //------------------------------------------------------------------------------
@@ -229,115 +224,96 @@ static int32_t bit_xor(int32_t x, int32_t y) { return x ^ y; }
 //   to ranges as input types.
 
 
-TEST(TypeJSAdd) {
-  TyperTester t;
-  t.TestBinaryArithOp(t.javascript_.Add(), std::plus<double>());
+TEST_F(TyperTest, TypeJSAdd) {
+  TestBinaryArithOp(javascript_.Add(), std::plus<double>());
 }
 
 
-TEST(TypeJSSubtract) {
-  TyperTester t;
-  t.TestBinaryArithOp(t.javascript_.Subtract(), std::minus<double>());
+TEST_F(TyperTest, TypeJSSubtract) {
+  TestBinaryArithOp(javascript_.Subtract(), std::minus<double>());
 }
 
 
-TEST(TypeJSMultiply) {
-  TyperTester t;
-  t.TestBinaryArithOp(t.javascript_.Multiply(), std::multiplies<double>());
+TEST_F(TyperTest, TypeJSMultiply) {
+  TestBinaryArithOp(javascript_.Multiply(), std::multiplies<double>());
 }
 
 
-TEST(TypeJSDivide) {
-  TyperTester t;
-  t.TestBinaryArithOp(t.javascript_.Divide(), std::divides<double>());
+TEST_F(TyperTest, TypeJSDivide) {
+  TestBinaryArithOp(javascript_.Divide(), std::divides<double>());
 }
 
 
-TEST(TypeJSModulus) {
-  TyperTester t;
-  t.TestBinaryArithOp(t.javascript_.Modulus(), modulo);
+TEST_F(TyperTest, TypeJSModulus) {
+  TestBinaryArithOp(javascript_.Modulus(), modulo);
 }
 
 
-TEST(TypeJSBitwiseOr) {
-  TyperTester t;
-  t.TestBinaryBitOp(t.javascript_.BitwiseOr(), bit_or);
+TEST_F(TyperTest, TypeJSBitwiseOr) {
+  TestBinaryBitOp(javascript_.BitwiseOr(), bit_or);
 }
 
 
-TEST(TypeJSBitwiseAnd) {
-  TyperTester t;
-  t.TestBinaryBitOp(t.javascript_.BitwiseAnd(), bit_and);
+TEST_F(TyperTest, TypeJSBitwiseAnd) {
+  TestBinaryBitOp(javascript_.BitwiseAnd(), bit_and);
 }
 
 
-TEST(TypeJSBitwiseXor) {
-  TyperTester t;
-  t.TestBinaryBitOp(t.javascript_.BitwiseXor(), bit_xor);
+TEST_F(TyperTest, TypeJSBitwiseXor) {
+  TestBinaryBitOp(javascript_.BitwiseXor(), bit_xor);
 }
 
 
-TEST(TypeJSShiftLeft) {
-  TyperTester t;
-  t.TestBinaryBitOp(t.javascript_.ShiftLeft(), shift_left);
+TEST_F(TyperTest, TypeJSShiftLeft) {
+  TestBinaryBitOp(javascript_.ShiftLeft(), shift_left);
 }
 
 
-TEST(TypeJSShiftRight) {
-  TyperTester t;
-  t.TestBinaryBitOp(t.javascript_.ShiftRight(), shift_right);
+TEST_F(TyperTest, TypeJSShiftRight) {
+  TestBinaryBitOp(javascript_.ShiftRight(), shift_right);
 }
 
 
-TEST(TypeJSLessThan) {
-  TyperTester t;
-  t.TestBinaryCompareOp(t.javascript_.LessThan(), std::less<double>());
+TEST_F(TyperTest, TypeJSLessThan) {
+  TestBinaryCompareOp(javascript_.LessThan(), std::less<double>());
 }
 
 
-TEST(TypeJSLessThanOrEqual) {
-  TyperTester t;
-  t.TestBinaryCompareOp(
-      t.javascript_.LessThanOrEqual(), std::less_equal<double>());
+TEST_F(TyperTest, TypeJSLessThanOrEqual) {
+  TestBinaryCompareOp(javascript_.LessThanOrEqual(), std::less_equal<double>());
 }
 
 
-TEST(TypeJSGreaterThan) {
-  TyperTester t;
-  t.TestBinaryCompareOp(t.javascript_.GreaterThan(), std::greater<double>());
+TEST_F(TyperTest, TypeJSGreaterThan) {
+  TestBinaryCompareOp(javascript_.GreaterThan(), std::greater<double>());
 }
 
 
-TEST(TypeJSGreaterThanOrEqual) {
-  TyperTester t;
-  t.TestBinaryCompareOp(
-      t.javascript_.GreaterThanOrEqual(), std::greater_equal<double>());
+TEST_F(TyperTest, TypeJSGreaterThanOrEqual) {
+  TestBinaryCompareOp(javascript_.GreaterThanOrEqual(),
+                      std::greater_equal<double>());
 }
 
 
-TEST(TypeJSEqual) {
-  TyperTester t;
-  t.TestBinaryCompareOp(t.javascript_.Equal(), std::equal_to<double>());
+TEST_F(TyperTest, TypeJSEqual) {
+  TestBinaryCompareOp(javascript_.Equal(), std::equal_to<double>());
 }
 
 
-TEST(TypeJSNotEqual) {
-  TyperTester t;
-  t.TestBinaryCompareOp(t.javascript_.NotEqual(), std::not_equal_to<double>());
+TEST_F(TyperTest, TypeJSNotEqual) {
+  TestBinaryCompareOp(javascript_.NotEqual(), std::not_equal_to<double>());
 }
 
 
 // For numbers there's no difference between strict and non-strict equality.
-TEST(TypeJSStrictEqual) {
-  TyperTester t;
-  t.TestBinaryCompareOp(t.javascript_.StrictEqual(), std::equal_to<double>());
+TEST_F(TyperTest, TypeJSStrictEqual) {
+  TestBinaryCompareOp(javascript_.StrictEqual(), std::equal_to<double>());
 }
 
 
-TEST(TypeJSStrictNotEqual) {
-  TyperTester t;
-  t.TestBinaryCompareOp(
-      t.javascript_.StrictNotEqual(), std::not_equal_to<double>());
+TEST_F(TyperTest, TypeJSStrictNotEqual) {
+  TestBinaryCompareOp(javascript_.StrictNotEqual(),
+                      std::not_equal_to<double>());
 }
 
 
@@ -369,9 +345,22 @@ TEST(TypeJSStrictNotEqual) {
 
 
 #define TEST_FUNC(name)                         \
-  TEST(Monotonicity_##name) {                       \
-    TyperTester t;                                  \
-    t.TestBinaryMonotonicity(t.javascript_.name()); \
+  TEST_F(TyperTest, Monotonicity_##name) {      \
+    TestBinaryMonotonicity(javascript_.name()); \
   }
 JSBINOP_LIST(TEST_FUNC)
 #undef TEST_FUNC
+
+
+//------------------------------------------------------------------------------
+// Regression tests
+
+
+TEST_F(TyperTest, TypeRegressInt32Constant) {
+  int values[] = {-5, 10};
+  for (auto i : values) {
+    Node* c = graph()->NewNode(common()->Int32Constant(i));
+    Type* type = NodeProperties::GetBounds(c).upper;
+    EXPECT_TRUE(type->Is(NewRange(i, i)));
+  }
+}

test/unittests/unittests.gyp

@@ -73,6 +73,7 @@
         'compiler/scheduler-unittest.cc',
         'compiler/simplified-operator-reducer-unittest.cc',
         'compiler/simplified-operator-unittest.cc',
+        'compiler/typer-unittest.cc',
         'compiler/value-numbering-reducer-unittest.cc',
         'compiler/zone-pool-unittest.cc',
         'libplatform/default-platform-unittest.cc',