// Copyright 2019 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.

intrinsic %FromConstexpr<To: type, From: type>(b: From): To;
macro FromConstexpr<To: type, From: type>(o: From): To;
FromConstexpr<int31, constexpr int31>(i: constexpr int31): int31 {
  return %FromConstexpr<int31>(i);
}
FromConstexpr<int32, constexpr int31>(i: constexpr int31): int32 {
  return %FromConstexpr<int32>(i);
}
FromConstexpr<int32, constexpr int32>(i: constexpr int32): int32 {
  return %FromConstexpr<int32>(i);
}
FromConstexpr<intptr, constexpr int31>(i: constexpr int31): intptr {
  return %FromConstexpr<intptr>(i);
}
FromConstexpr<intptr, constexpr int32>(i: constexpr int32): intptr {
  return %FromConstexpr<intptr>(i);
}
FromConstexpr<intptr, constexpr intptr>(i: constexpr intptr): intptr {
  return %FromConstexpr<intptr>(i);
}
FromConstexpr<uintptr, constexpr uintptr>(i: constexpr uintptr): uintptr {
  return %FromConstexpr<uintptr>(i);
}
FromConstexpr<Smi, constexpr int31>(i: constexpr int31): Smi {
  return %FromConstexpr<Smi>(i);
}
FromConstexpr<PositiveSmi, constexpr int31>(i: constexpr int31): PositiveSmi {
  assert(i >= 0);
  return %FromConstexpr<PositiveSmi>(i);
}
FromConstexpr<String, constexpr string>(s: constexpr string): String {
  return %FromConstexpr<String>(s);
}
FromConstexpr<Number, constexpr uint32>(i: constexpr uint32): Number {
  return %FromConstexpr<Number>(i);
}
FromConstexpr<Number, constexpr int32>(i: constexpr int32): Number {
  return %FromConstexpr<Number>(i);
}
FromConstexpr<Number, constexpr float64>(f: constexpr float64): Number {
  return %FromConstexpr<Number>(f);
}
FromConstexpr<Number, constexpr int31>(i: constexpr int31): Number {
  return %FromConstexpr<Number>(i);
}
FromConstexpr<uint8, constexpr int31>(i: constexpr int31): uint8 {
  const i: uint32 = i;
  static_assert(i <= 255);
  return %RawDownCast<uint8>(i);
}
FromConstexpr<int8, constexpr int31>(i: constexpr int31): int8 {
  const i: int32 = i;
  static_assert(-128 <= i && i <= 127);
  return %RawDownCast<int8>(i);
}
FromConstexpr<char8, constexpr int31>(i: constexpr int31): char8 {
  const i: int32 = i;
  static_assert(i <= 255);
  static_assert(0 <= i);
  return %RawDownCast<char8>(i);
}
FromConstexpr<Number, constexpr Smi>(s: constexpr Smi): Number {
  return SmiConstant(s);
}
FromConstexpr<Smi, constexpr Smi>(s: constexpr Smi): Smi {
  return SmiConstant(s);
}
FromConstexpr<uint32, constexpr int31>(i: constexpr int31): uint32 {
  return Unsigned(Int32Constant(i));
}
FromConstexpr<uint32, constexpr uint32>(i: constexpr uint32): uint32 {
  return Unsigned(%FromConstexpr<int32>(i));
}
FromConstexpr<uintptr, constexpr int31>(i: constexpr int31): uintptr {
  return ChangeUint32ToWord(i);
}
FromConstexpr<float64, constexpr int31>(i: constexpr int31): float64 {
  return Float64Constant(i);
}
FromConstexpr<float64, constexpr float64>(i: constexpr float64): float64 {
  return Float64Constant(i);
}
FromConstexpr<bool, constexpr bool>(b: constexpr bool): bool {
  return BoolConstant(b);
}
FromConstexpr<Object, constexpr string>(s: constexpr string): Object {
  return StringConstant(s);
}
FromConstexpr<JSAny, constexpr string>(s: constexpr string): JSAny {
  return StringConstant(s);
}
FromConstexpr<ContextSlot, constexpr ContextSlot>(c: constexpr ContextSlot):
    ContextSlot {
  return IntPtrConstant(c);
}
FromConstexpr<LanguageModeSmi, constexpr LanguageMode>(
    c: constexpr LanguageMode): LanguageModeSmi {
  return %RawDownCast<LanguageModeSmi>(SmiConstant(c));
}
FromConstexpr<PromiseState, constexpr PromiseState>(c: constexpr PromiseState):
    PromiseState {
  return %RawDownCast<PromiseState>(Int32Constant(c));
}
FromConstexpr<InstanceType, constexpr InstanceType>(c: constexpr InstanceType):
    InstanceType {
  return %RawDownCast<InstanceType>(Uint16Constant(c));
}

FromConstexpr<IterationKind, constexpr IterationKind>(
    c: constexpr IterationKind): IterationKind {
  return %RawDownCast<IterationKind>(Unsigned(%FromConstexpr<int32>(c)));
}

FromConstexpr<string::TrimMode, string::constexpr TrimMode>(
    c: string::constexpr TrimMode): string::TrimMode {
  return %RawDownCast<string::TrimMode>(Unsigned(%FromConstexpr<int32>(c)));
}

macro Convert<To: type, From: type>(i: From): To {
  return i;
}

macro Convert<To: type, From: type>(i: From): To labels Overflow {
  return i;
}

Convert<Boolean, bool>(b: bool): Boolean {
  return b ? True : False;
}
extern macro ConvertElementsKindToInt(ElementsKind): int32;
Convert<int32, ElementsKind>(elementsKind: ElementsKind): int32 {
  return ConvertElementsKindToInt(elementsKind);
}
Convert<Number, int32>(i: int32): Number {
  return ChangeInt32ToTagged(i);
}
Convert<intptr, int32>(i: int32): intptr {
  return ChangeInt32ToIntPtr(i);
}
Convert<intptr, int31>(i: int31): intptr {
  return ChangeInt32ToIntPtr(i);
}
Convert<intptr, uint32>(i: uint32): intptr {
  return Signed(ChangeUint32ToWord(i));
}
Convert<Smi, int32>(i: int32): Smi {
  return SmiFromInt32(i);
}
Convert<Number, uint32>(ui: uint32): Number {
  return ChangeUint32ToTagged(ui);
}
Convert<Smi, uint32>(ui: uint32): Smi {
  return SmiFromUint32(ui);
}
Convert<uintptr, uint32>(ui: uint32): uintptr {
  return ChangeUint32ToWord(ui);
}
Convert<intptr, uint16>(ui: uint16): intptr {
  return Signed(ChangeUint32ToWord(ui));
}
Convert<intptr, uint8>(ui: uint8): intptr {
  return Signed(ChangeUint32ToWord(ui));
}
Convert<uint8, intptr>(i: intptr): uint8 {
  return %RawDownCast<uint8>(Unsigned(TruncateIntPtrToInt32(i)) & 0xFF);
}
Convert<int8, intptr>(i: intptr): int8 {
  return %RawDownCast<int8>(TruncateIntPtrToInt32(i) << 24 >> 24);
}
Convert<int32, uint8>(i: uint8): int32 {
  return Signed(Convert<uint32>(i));
}
Convert<int32, uint16>(i: uint16): int32 {
  return Signed(Convert<uint32>(i));
}
Convert<int32, uint31>(i: uint31): int32 {
  return Signed(Convert<uint32>(i));
}
Convert<int32, intptr>(i: intptr): int32 {
  return TruncateIntPtrToInt32(i);
}
Convert<int32, Number>(n: Number): int32 {
  typeswitch (n) {
    case (s: Smi): {
      return Convert<int32>(s);
    }
    case (h: HeapNumber): {
      return TruncateHeapNumberValueToWord32(h);
    }
  }
}

Convert<Smi, intptr>(i: intptr): Smi {
  return SmiTag(i);
}
Convert<uint32, uintptr>(ui: uintptr): uint32 {
  return Unsigned(TruncateIntPtrToInt32(Signed(ui)));
}
Convert<intptr, Smi>(s: Smi): intptr {
  return SmiUntag(s);
}
Convert<uintptr, PositiveSmi>(ps: PositiveSmi): uintptr {
  return Unsigned(SmiUntag(ps));
}
Convert<intptr, TaggedIndex>(ti: TaggedIndex): intptr {
  return TaggedIndexToIntPtr(ti);
}
Convert<TaggedIndex, intptr>(i: intptr): TaggedIndex {
  return IntPtrToTaggedIndex(i);
}
Convert<intptr, uintptr>(ui: uintptr): intptr {
  const i = Signed(ui);
  assert(i >= 0);
  return i;
}
Convert<PositiveSmi, intptr>(i: intptr): PositiveSmi {
  assert(IsValidPositiveSmi(i));
  return %RawDownCast<PositiveSmi>(SmiTag(i));
}
Convert<PositiveSmi, uintptr>(ui: uintptr): PositiveSmi labels IfOverflow {
  if (ui > kSmiMaxValue) deferred {
      goto IfOverflow;
    }
  return %RawDownCast<PositiveSmi>(SmiTag(Signed(ui)));
}
Convert<PositiveSmi, intptr>(i: intptr): PositiveSmi labels IfOverflow {
  if (IsValidPositiveSmi(i)) {
    return %RawDownCast<PositiveSmi>(SmiTag(i));
  } else
    deferred {
      goto IfOverflow;
    }
}
Convert<PositiveSmi, uint32>(ui: uint32): PositiveSmi labels IfOverflow {
  return Convert<PositiveSmi>(Convert<uintptr>(ui)) otherwise IfOverflow;
}
Convert<int32, Smi>(s: Smi): int32 {
  return SmiToInt32(s);
}
Convert<float64, HeapNumber>(h: HeapNumber): float64 {
  return LoadHeapNumberValue(h);
}
Convert<float64, Number>(n: Number): float64 {
  return ChangeNumberToFloat64(n);
}
Convert<uintptr, Number>(n: Number): uintptr {
  return ChangeUintPtrNumberToUintPtr(n);
}
Convert<float64, int32>(f: int32): float64 {
  return ChangeInt32ToFloat64(f);
}
Convert<float64, float32>(f: float32): float64 {
  return ChangeFloat32ToFloat64(f);
}
Convert<float64_or_hole, float64>(f: float64): float64_or_hole {
  return float64_or_hole{is_hole: false, value: f};
}
Convert<float64_or_hole, Number>(n: Number): float64_or_hole {
  return Convert<float64_or_hole>(Convert<float64>(n));
}
Convert<float32, float64>(f: float64): float32 {
  return TruncateFloat64ToFloat32(f);
}
Convert<float32, Number>(n: Number): float32 {
  return Convert<float32>(ChangeNumberToFloat64(n));
}
Convert<Number, float64>(d: float64): Number {
  return ChangeFloat64ToTagged(d);
}
Convert<float64, uintptr>(ui: uintptr): float64 {
  return ChangeUintPtrToFloat64(ui);
}
Convert<Number, uintptr>(ui: uintptr): Number {
  return ChangeUintPtrToTagged(ui);
}
Convert<Number, intptr>(i: intptr): Number {
  return ChangeUintPtrToTagged(Unsigned(i));
}
Convert<uintptr, float64>(d: float64): uintptr {
  return ChangeFloat64ToUintPtr(d);
}
Convert<uintptr, intptr>(i: intptr): uintptr {
  return Unsigned(i);
}
Convert<uintptr, RawPtr>(r: RawPtr): uintptr {
  return Unsigned(r);
}
Convert<intptr, RawPtr>(r: RawPtr): intptr {
  return Signed(r);
}
Convert<intptr, Number>(n: Number): intptr {
  return ChangeFloat64ToIntPtr(ChangeNumberToFloat64(n));
}
Convert<bint, int32>(v: int32): bint {
  return IntPtrToBInt(Convert<intptr>(v));
}
extern macro IntPtrToBInt(intptr): bint;
Convert<bint, intptr>(v: intptr): bint {
  return IntPtrToBInt(v);
}
extern macro BIntToIntPtr(bint): intptr;
Convert<intptr, bint>(v: bint): intptr {
  return BIntToIntPtr(v);
}
extern macro SmiToBInt(Smi): bint;
Convert<bint, Smi>(v: Smi): bint {
  return SmiToBInt(v);
}
extern macro BIntToSmi(bint): Smi;
Convert<Smi, bint>(v: bint): Smi {
  return BIntToSmi(v);
}
Convert<PromiseState, int32>(s: int32): PromiseState {
  return %RawDownCast<PromiseState>(s);
}
Convert<ScopeFlags, Smi>(s: Smi): ScopeFlags {
  return %RawDownCast<ScopeFlags>(Unsigned(SmiToInt32(s)));
}