#38002

Committed 06 Feb 2025 06:14AM UTC coverage: 20.322% (-2.4%) from 22.722%

Build # #38002

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Commit Message

bpart: Fully switch to partitioned semantics (#57253)

This is the final PR in the binding partitions series (modulo bugs and
tweaks), i.e. it closes #54654 and thus closes #40399, which was the
original design sketch.

This thus activates the full designed semantics for binding partitions,
in particular allowing safe replacement of const bindings. It in
particular allows struct redefinitions. This thus closes
timholy/Revise.jl#18 and also closes #38584.

The biggest semantic change here is probably that this gets rid of the
notion of "resolvedness" of a binding. Previously, a lot of the behavior
of our implementation depended on when bindings were "resolved", which
could happen at basically an arbitrary point (in the compiler, in REPL
completion, in a different thread), making a lot of the semantics around
bindings ill- or at least implementation-defined. There are several
related issues in the bugtracker, so this closes #14055 closes #44604
closes #46354 closes #30277

It is also the last step to close #24569.
It also supports bindings for undef->defined transitions and thus closes
#53958 closes #54733 - however, this is not activated yet for
performance reasons and may need some further optimization.

Since resolvedness no longer exists, we need to replace it with some
hopefully more well-defined semantics. I will describe the semantics
below, but before I do I will make two notes:

1. There are a number of cases where these semantics will behave
slightly differently than the old semantics absent some other task going
around resolving random bindings.
2. The new behavior (except for the replacement stuff) was generally
permissible under the old semantics if the bindings happened to be
resolved at the right time.

With all that said, there are essentially three "strengths" of bindings:

1. Implicit Bindings: Anything implicitly obtained from `using Mod`, "no
binding", plus slightly more exotic corner cases around conflicts

2. Weakly declared bindin... (continued)

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31.18

/base/boot.jl

# This file is a part of Julia. License is MIT: https://julialang.org/license

# commented-out definitions are implemented in C

#abstract type Any <: Any end
#abstract type Type{T} end

#abstract type Vararg{T} end

#mutable struct Symbol
## opaque
#end

#mutable struct TypeName
#    name::Symbol
#end

#mutable struct DataType <: Type
#    name::TypeName
#    super::Type
#    parameters::Tuple
#    names::Tuple
#    types::Tuple
#    ctor
#    instance
#    size::Int32
#    abstract::Bool
#    mutable::Bool
#    pointerfree::Bool
#end

#struct Union <: Type
#    a
#    b
#end

#mutable struct TypeVar
#    name::Symbol
#    lb::Type
#    ub::Type
#end

#struct UnionAll
#    var::TypeVar
#    body
#end

#struct Nothing
#end
#const nothing = Nothing()

#abstract type AbstractArray{T,N} end
#abstract type DenseArray{T,N} <: AbstractArray{T,N} end

#primitive type AddrSpace{Backend::Module} 8 end
#const CPU = bitcast(AddrSpace{Core}, 0x00)

#struct GenericMemory{kind::Symbol, T, AS::AddrSpace}
#   length::Int
#   const data::Ptr{Cvoid} # make this GenericPtr{addrspace, Cvoid}
#   Union{ # hidden data
#       elements :: NTuple{length, T}
#       owner :: Any
#   }
#end

#struct GenericMemoryRef{kind::Symbol, T, AS::AddrSpace}
#    mem::GenericMemory{kind, T, AS}
#    data::Ptr{Cvoid} # make this GenericPtr{addrspace, Cvoid}
#end

#mutable struct Array{T,N} <: DenseArray{T,N}
#  ref::MemoryRef{T}
#  size::NTuple{N,Int}
#end

#mutable struct Module
## opaque
#end

#mutable struct SimpleVector
## opaque
#end

#mutable struct String
## opaque
#end

#mutable struct Method
#...
#end

#mutable struct MethodInstance
#...
#end

#mutable struct CodeInstance
#...
#end

#mutable struct CodeInfo
#...
#end

#mutable struct TypeMapLevel
#...
#end

#mutable struct TypeMapEntry
#...
#end

#abstract type Ref{T} end
#primitive type Ptr{T} <: Ref{T} {32|64} end

# types for the front end

#mutable struct Expr
#    head::Symbol
#    args::Array{Any,1}
#end

#struct LineNumberNode
#    line::Int
#    file::Union{Symbol,Nothing}
#end

#struct LegacyLineInfoNode end # only used internally during lowering

#struct DebugInfo
#    def::Any # (Union{Symbol, Method, MethodInstance})
#    linetable::Any # (Union{Nothing,DebugInfo})
#    edges::SimpleVector # Vector{DebugInfo}
#    codelocs::String # compressed Vector{UInt8}
#end

#struct GotoNode
#    label::Int
#end

#struct GotoIfNot
#    cond::Any
#    dest::Int
#end

#struct ReturnNode
#    val::Any
#end

#struct PiNode
#    val
#    typ
#end

#struct PhiNode
#    edges::Vector{Int32}
#    values::Vector{Any}
#end

#struct PhiCNode
#    values::Vector{Any}
#end

#struct UpsilonNode
#    val
#end

#struct QuoteNode
#    value
#end

#struct GlobalRef
#    mod::Module
#    name::Symbol
#end

#mutable struct Task
#    next::Any
#    queue::Any
#    storage::Any
#    donenotify::Any
#    result::Any
#    scope::Any
#    code::Any
#    @atomic _state::UInt8
#    sticky::UInt8
#    priority::UInt16
#    @atomic _isexception::UInt8
#    pad00::UInt8
#    pad01::UInt8
#    pad02::UInt8
#    rngState0::UInt64
#    rngState1::UInt64
#    rngState2::UInt64
#    rngState3::UInt64
#    rngState4::UInt64
#    const metrics_enabled::Bool
#    pad10::UInt8
#    pad11::UInt8
#    pad12::UInt8
#    @atomic first_enqueued_at::UInt64
#    @atomic last_started_running_at::UInt64
#    @atomic running_time_ns::UInt64
#    @atomic finished_at::UInt64
#end

export
    # key types
    Any, DataType, Vararg, NTuple,
    Tuple, Type, UnionAll, TypeVar, Union, Nothing, Cvoid,
    AbstractArray, DenseArray, NamedTuple, Pair,
    # special objects
    Function, Method, Module, Symbol, Task, UndefInitializer, undef, WeakRef, VecElement,
    Array, Memory, MemoryRef, AtomicMemory, AtomicMemoryRef, GenericMemory, GenericMemoryRef,
    # numeric types
    Number, Real, Integer, Bool, Ref, Ptr,
    AbstractFloat, Float16, Float32, Float64,
    Signed, Int, Int8, Int16, Int32, Int64, Int128,
    Unsigned, UInt, UInt8, UInt16, UInt32, UInt64, UInt128,
    # string types
    AbstractChar, Char, AbstractString, String, IO,
    # errors
    ErrorException, BoundsError, DivideError, DomainError, Exception,
    InterruptException, InexactError, OutOfMemoryError, ReadOnlyMemoryError,
    OverflowError, StackOverflowError, SegmentationFault, UndefRefError, UndefVarError,
    TypeError, ArgumentError, MethodError, AssertionError, LoadError, InitError,
    UndefKeywordError, ConcurrencyViolationError, FieldError,
    # AST representation
    Expr, QuoteNode, LineNumberNode, GlobalRef,
    # object model functions
    fieldtype, getfield, setfield!, swapfield!, modifyfield!, replacefield!, setfieldonce!,
    nfields, throw, tuple, ===, isdefined,
    # access to globals
    getglobal, setglobal!, swapglobal!, modifyglobal!, replaceglobal!, setglobalonce!, isdefinedglobal,
    # ifelse, sizeof    # not exported, to avoid conflicting with Base
    # type reflection
    <:, typeof, isa, typeassert,
    # method reflection
    applicable, invoke,
    # constants
    nothing, Main

const getproperty = getfield # TODO: use `getglobal` for modules instead
const setproperty! = setfield!

abstract type Number end
abstract type Real     <: Number end
abstract type AbstractFloat <: Real end
abstract type Integer  <: Real end
abstract type Signed   <: Integer end
abstract type Unsigned <: Integer end

primitive type Float16 <: AbstractFloat 16 end
primitive type Float32 <: AbstractFloat 32 end
primitive type Float64 <: AbstractFloat 64 end

primitive type BFloat16 <: AbstractFloat 16 end

#primitive type Bool <: Integer 8 end
abstract type AbstractChar end
primitive type Char <: AbstractChar 32 end

primitive type Int8    <: Signed   8 end
#primitive type UInt8   <: Unsigned 8 end
primitive type Int16   <: Signed   16 end
#primitive type UInt16  <: Unsigned 16 end
#primitive type Int32   <: Signed   32 end
#primitive type UInt32  <: Unsigned 32 end
#primitive type Int64   <: Signed   64 end
#primitive type UInt64  <: Unsigned 64 end
primitive type Int128  <: Signed   128 end
primitive type UInt128 <: Unsigned 128 end

if Int === Int64
    const UInt = UInt64
else
    const UInt = UInt32
end

function Typeof end
ccall(:jl_toplevel_eval_in, Any, (Any, Any),
      Core, quote
      (f::typeof(Typeof))(x) = ($(_expr(:meta,:nospecialize,:x)); isa(x,Type) ? Type{x} : typeof(x))
      end)

function iterate end

macro nospecialize(x)
    _expr(:meta, :nospecialize, x)
end
Expr(@nospecialize args...) = _expr(args...)

macro latestworld() Expr(:latestworld) end

_is_internal(__module__) = __module__ === Core
# can be used in place of `@assume_effects :total` (supposed to be used for bootstrapping)
macro _total_meta()
    return _is_internal(__module__) && Expr(:meta, Expr(:purity,
        #=:consistent=#true,
        #=:effect_free=#true,
        #=:nothrow=#true,
        #=:terminates_globally=#true,
        #=:terminates_locally=#false,
        #=:notaskstate=#true,
        #=:inaccessiblememonly=#true,
        #=:noub=#true,
        #=:noub_if_noinbounds=#false,
        #=:consistent_overlay=#false,
        #=:nortcall=#true))
end
# can be used in place of `@assume_effects :foldable` (supposed to be used for bootstrapping)
macro _foldable_meta()
    return _is_internal(__module__) && Expr(:meta, Expr(:purity,
        #=:consistent=#true,
        #=:effect_free=#true,
        #=:nothrow=#false,
        #=:terminates_globally=#true,
        #=:terminates_locally=#false,
        #=:notaskstate=#true,
        #=:inaccessiblememonly=#true,
        #=:noub=#true,
        #=:noub_if_noinbounds=#false,
        #=:consistent_overlay=#false,
        #=:nortcall=#true))
end

macro inline()   Expr(:meta, :inline)   end
macro noinline() Expr(:meta, :noinline) end

macro _boundscheck() Expr(:boundscheck) end

# n.b. the effects and model of these is refined in inference abstractinterpretation.jl
TypeVar(@nospecialize(n)) = _typevar(n::Symbol, Union{}, Any)
TypeVar(@nospecialize(n), @nospecialize(ub)) = _typevar(n::Symbol, Union{}, ub)
TypeVar(@nospecialize(n), @nospecialize(lb), @nospecialize(ub)) = _typevar(n::Symbol, lb, ub)
UnionAll(@nospecialize(v), @nospecialize(t)) = ccall(:jl_type_unionall, Any, (Any, Any), v::TypeVar, t)

const Memory{T} = GenericMemory{:not_atomic, T, CPU}
const MemoryRef{T} = GenericMemoryRef{:not_atomic, T, CPU}

# simple convert for use by constructors of types in Core
# note that there is no actual conversion defined here,
# so the methods and ccall's in Core aren't permitted to use convert
convert(::Type{Any}, @nospecialize(x)) = x
convert(::Type{T}, x::T) where {T} = x
cconvert(::Type{T}, x) where {T} = convert(T, x)
unsafe_convert(::Type{T}, x::T) where {T} = x

# will be inserted by the frontend for closures
_typeof_captured_variable(@nospecialize t) = (@_total_meta; t isa Type && has_free_typevars(t) ? typeof(t) : Typeof(t))

has_free_typevars(@nospecialize t) = (@_total_meta; ccall(:jl_has_free_typevars, Int32, (Any,), t) === Int32(1))

# dispatch token indicating a kwarg (keyword sorter) call
function kwcall end
# deprecated internal functions:
kwfunc(@nospecialize(f)) = kwcall
kwftype(@nospecialize(t)) = typeof(kwcall)

# Let the compiler assume that calling Union{} as a constructor does not need
# to be considered ever (which comes up often as Type{<:T} inference, and
# occasionally in user code from eltype).
Union{}(a...) = throw(ArgumentError("cannot construct a value of type Union{} for return result"))
kwcall(kwargs, ::Type{Union{}}, a...) = Union{}(a...)

abstract type Exception end
struct ErrorException <: Exception
    msg::AbstractString
end

struct BoundsError <: Exception
    a::Any
    i::Any
    BoundsError() = new()
    BoundsError(@nospecialize(a)) = (@noinline; new(a))
    BoundsError(@nospecialize(a), i) = (@noinline; new(a,i))
end
struct DivideError         <: Exception end
struct OutOfMemoryError    <: Exception end
struct ReadOnlyMemoryError <: Exception end
struct SegmentationFault   <: Exception end
struct StackOverflowError  <: Exception end
struct UndefRefError       <: Exception end
struct UndefVarError <: Exception
    var::Symbol
    world::UInt
    scope # a Module or Symbol or other object describing the context where this variable was looked for (e.g. Main or :local or :static_parameter)
    UndefVarError(var::Symbol) = new(var, ccall(:jl_get_tls_world_age, UInt, ()))
    UndefVarError(var::Symbol, @nospecialize scope) = new(var, ccall(:jl_get_tls_world_age, UInt, ()), scope)
end
struct ConcurrencyViolationError <: Exception
    msg::AbstractString
end
struct MissingCodeError <: Exception
    mi::MethodInstance
end
struct InterruptException <: Exception end
struct DomainError <: Exception
    val
    msg::AbstractString
    DomainError(@nospecialize(val)) = (@noinline; new(val, ""))
    DomainError(@nospecialize(val), @nospecialize(msg)) = (@noinline; new(val, msg))
end
struct TypeError <: Exception
    # `func` is the name of the builtin function that encountered a type error,
    # the name of the type that hit an error in its definition or application, or
    # some other brief description of where the error happened.
    # `context` optionally adds extra detail, e.g. the name of the type parameter
    # that got a bad value.
    func::Symbol
    context::Union{AbstractString,Symbol}
    expected::Type
    got
    TypeError(func, context, @nospecialize(expected::Type), @nospecialize(got)) =
        new(func, context, expected, got)
end
TypeError(where, @nospecialize(expected::Type), @nospecialize(got)) =
    TypeError(Symbol(where), "", expected, got)
struct InexactError <: Exception
    func::Symbol
    args
    InexactError(f::Symbol, @nospecialize(args...)) = (@noinline; new(f, args))
end
struct OverflowError <: Exception
    msg::AbstractString
end

struct ArgumentError <: Exception
    msg::AbstractString
end
struct UndefKeywordError <: Exception
    var::Symbol
end

const typemax_UInt = Intrinsics.sext_int(UInt, 0xFF)
const typemax_Int = Core.Intrinsics.udiv_int(Core.Intrinsics.sext_int(Int, 0xFF), 2)

struct MethodError <: Exception
    f
    args
    world::UInt
    MethodError(@nospecialize(f), @nospecialize(args), world::UInt) = new(f, args, world)
end
MethodError(@nospecialize(f), @nospecialize(args)) = MethodError(f, args, typemax_UInt)

struct AssertionError <: Exception
    msg::AbstractString
end
AssertionError() = AssertionError("")

struct FieldError <: Exception
    type::DataType
    field::Symbol
end

abstract type WrappedException <: Exception end

struct LoadError <: WrappedException
    file::AbstractString
    line::Int
    error
end

struct InitError <: WrappedException
    mod::Symbol
    error
end

struct ABIOverride
    abi::Type
    def::MethodInstance
    ABIOverride(@nospecialize(abi::Type), def::MethodInstance) = new(abi, def)
end

struct PrecompilableError <: Exception end

String(s::String) = s  # no constructor yet

const Cvoid = Nothing
Nothing() = nothing

# This should always be inlined
getptls() = ccall(:jl_get_ptls_states, Ptr{Cvoid}, ())

include(m::Module, fname::String) = (@noinline; ccall(:jl_load_, Any, (Any, Any), m, fname))
eval(m::Module, @nospecialize(e)) = (@noinline; ccall(:jl_toplevel_eval_in, Any, (Any, Any), m, e))

struct EvalInto <: Function
    m::Module
end
(this::EvalInto)(@nospecialize(e)) = eval(this.m, e)

mutable struct Box
    contents::Any
    Box(@nospecialize(x)) = new(x)
    Box() = new()
end

# constructors for built-in types

mutable struct WeakRef
    value
    WeakRef() = WeakRef(nothing)
    WeakRef(@nospecialize(v)) = ccall(:jl_gc_new_weakref_th, Ref{WeakRef},
                                      (Ptr{Cvoid}, Any), getptls(), v)
end

Tuple{}() = ()

struct VecElement{T}
    value::T
    VecElement{T}(value::T) where {T} = new(value) # disable converting constructor in Core
end
VecElement(arg::T) where {T} = VecElement{T}(arg)

eval(Core, quote
    GotoNode(label::Int) = $(Expr(:new, :GotoNode, :label))
    NewvarNode(slot::SlotNumber) = $(Expr(:new, :NewvarNode, :slot))
    QuoteNode(@nospecialize value) = $(Expr(:new, :QuoteNode, :value))
    SSAValue(id::Int) = $(Expr(:new, :SSAValue, :id))
    Argument(n::Int) = $(Expr(:new, :Argument, :n))
    ReturnNode(@nospecialize val) = $(Expr(:new, :ReturnNode, :val))
    ReturnNode() = $(Expr(:new, :ReturnNode)) # unassigned val indicates unreachable
    GotoIfNot(@nospecialize(cond), dest::Int) = $(Expr(:new, :GotoIfNot, :cond, :dest))
    EnterNode(dest::Int) = $(Expr(:new, :EnterNode, :dest))
    EnterNode(dest::Int, @nospecialize(scope)) = $(Expr(:new, :EnterNode, :dest, :scope))
    LineNumberNode(l::Int) = $(Expr(:new, :LineNumberNode, :l, nothing))
    function LineNumberNode(l::Int, @nospecialize(f))
        isa(f, String) && (f = Symbol(f))
        return $(Expr(:new, :LineNumberNode, :l, :f))
    end
    DebugInfo(def::Union{Method,MethodInstance,Symbol}, linetable::Union{Nothing,DebugInfo}, edges::SimpleVector, codelocs::String) =
        $(Expr(:new, :DebugInfo, :def, :linetable, :edges, :codelocs))
    DebugInfo(def::Union{Method,MethodInstance,Symbol}) =
        $(Expr(:new, :DebugInfo, :def, nothing, Core.svec(), ""))
    SlotNumber(n::Int) = $(Expr(:new, :SlotNumber, :n))
    PhiNode(edges::Array{Int32, 1}, values::Array{Any, 1}) = $(Expr(:new, :PhiNode, :edges, :values))
    PiNode(@nospecialize(val), @nospecialize(typ)) = $(Expr(:new, :PiNode, :val, :typ))
    PhiCNode(values::Array{Any, 1}) = $(Expr(:new, :PhiCNode, :values))
    UpsilonNode(@nospecialize(val)) = $(Expr(:new, :UpsilonNode, :val))
    UpsilonNode() = $(Expr(:new, :UpsilonNode))
    Const(@nospecialize(v)) = $(Expr(:new, :Const, :v))
    _PartialStruct(@nospecialize(typ), fields::Array{Any, 1}) = $(Expr(:new, :PartialStruct, :typ, :fields))
    PartialOpaque(@nospecialize(typ), @nospecialize(env), parent::MethodInstance, source) = $(Expr(:new, :PartialOpaque, :typ, :env, :parent, :source))
    InterConditional(slot::Int, @nospecialize(thentype), @nospecialize(elsetype)) = $(Expr(:new, :InterConditional, :slot, :thentype, :elsetype))
    MethodMatch(@nospecialize(spec_types), sparams::SimpleVector, method::Method, fully_covers::Bool) = $(Expr(:new, :MethodMatch, :spec_types, :sparams, :method, :fully_covers))
end)

const NullDebugInfo = DebugInfo(:none)

struct LineInfoNode # legacy support for aiding Serializer.deserialize of old IR
    mod::Module
    method
    file::Symbol
    line::Int32
    inlined_at::Int32
    LineInfoNode(mod::Module, @nospecialize(method), file::Symbol, line::Int32, inlined_at::Int32) = new(mod, method, file, line, inlined_at)
end


function CodeInstance(
    mi::Union{MethodInstance, ABIOverride}, owner, @nospecialize(rettype), @nospecialize(exctype), @nospecialize(inferred_const),
    @nospecialize(inferred), const_flags::Int32, min_world::UInt, max_world::UInt,
    effects::UInt32, @nospecialize(analysis_results),
    di::Union{DebugInfo,Nothing}, edges::SimpleVector)
    return ccall(:jl_new_codeinst, Ref{CodeInstance},
        (Any, Any, Any, Any, Any, Any, Int32, UInt, UInt, UInt32, Any, Any, Any),
        mi, owner, rettype, exctype, inferred_const, inferred, const_flags, min_world, max_world,
        effects, analysis_results, di, edges)
end
GlobalRef(m::Module, s::Symbol) = ccall(:jl_module_globalref, Ref{GlobalRef}, (Any, Any), m, s)
Module(name::Symbol=:anonymous, std_imports::Bool=true, default_names::Bool=true) = ccall(:jl_f_new_module, Ref{Module}, (Any, Bool, Bool), name, std_imports, default_names)

function _Task(@nospecialize(f), reserved_stack::Int, completion_future)
    return ccall(:jl_new_task, Ref{Task}, (Any, Any, Int), f, completion_future, reserved_stack)
end

const NTuple{N,T} = Tuple{Vararg{T,N}}

## primitive Array constructors
struct UndefInitializer end
const undef = UndefInitializer()

# type and dimensionality specified
(self::Type{GenericMemory{kind,T,addrspace}})(::UndefInitializer, m::Int) where {T,addrspace,kind} = memorynew(self, m)
(self::Type{GenericMemory{kind,T,addrspace}})(::UndefInitializer, d::NTuple{1,Int}) where {T,kind,addrspace} = self(undef, getfield(d,1))
# empty vector constructor
(self::Type{GenericMemory{kind,T,addrspace}})() where {T,kind,addrspace} = self(undef, 0)

memoryref(mem::GenericMemory) = memoryrefnew(mem)
memoryref(mem::GenericMemory, i::Integer) = memoryrefnew(memoryrefnew(mem), Int(i), @_boundscheck)
memoryref(ref::GenericMemoryRef, i::Integer) = memoryrefnew(ref, Int(i), @_boundscheck)
GenericMemoryRef(mem::GenericMemory) = memoryref(mem)
GenericMemoryRef(mem::GenericMemory, i::Integer) = memoryref(mem, i)
GenericMemoryRef(mem::GenericMemoryRef, i::Integer) = memoryref(mem, i)

const AtomicMemory{T} = GenericMemory{:atomic, T, CPU}
const AtomicMemoryRef{T} = GenericMemoryRef{:atomic, T, CPU}

# construction helpers for Array
new_as_memoryref(self::Type{GenericMemoryRef{kind,T,addrspace}}, m::Int) where {T,kind,addrspace} = memoryref(fieldtype(self, :mem)(undef, m))

# checked-multiply intrinsic function for dimensions
_checked_mul_dims() = 1, false
_checked_mul_dims(m::Int) = m, Intrinsics.ule_int(typemax_Int, m) # equivalently: (m + 1) < 1
function _checked_mul_dims(m::Int, n::Int)
    b = Intrinsics.checked_smul_int(m, n)
    a = getfield(b, 1)
    ovflw = getfield(b, 2)
    ovflw = Intrinsics.or_int(ovflw, Intrinsics.ule_int(typemax_Int, m))
    ovflw = Intrinsics.or_int(ovflw, Intrinsics.ule_int(typemax_Int, n))
    return a, ovflw
end
function _checked_mul_dims(m::Int, d::Int...)
    @_foldable_meta # the compiler needs to know this loop terminates
    a = m
    i = 1
    ovflw = false
    neg = Intrinsics.ule_int(typemax_Int, m)
    zero = false # if m==0 we won't have overflow since we go left to right
    while Intrinsics.sle_int(i, nfields(d))
        di = getfield(d, i)
        b = Intrinsics.checked_smul_int(a, di)
        zero = Intrinsics.or_int(zero, di === 0)
        ovflw = Intrinsics.or_int(ovflw, getfield(b, 2))
        neg = Intrinsics.or_int(neg, Intrinsics.ule_int(typemax_Int, di))
        a = getfield(b, 1)
        i = Intrinsics.add_int(i, 1)
   end
   return a, Intrinsics.or_int(neg, Intrinsics.and_int(ovflw, Intrinsics.not_int(zero)))
end

# convert a set of dims to a length, with overflow checking
checked_dims() = 1
checked_dims(m::Int) = m # defer this check to Memory constructor instead
function checked_dims(d::Int...)
    b = _checked_mul_dims(d...)
    getfield(b, 2) && throw(ArgumentError("invalid Array dimensions"))
    return getfield(b, 1)
end

# type and dimensionality specified, accepting dims as series of Ints
eval(Core, :(function (self::Type{Array{T,1}})(::UndefInitializer, m::Int) where {T}
    mem = fieldtype(fieldtype(self, :ref), :mem)(undef, m)
    return $(Expr(:new, :self, :(memoryref(mem)), :((m,))))
end))
eval(Core, :(function (self::Type{Array{T,2}})(::UndefInitializer, m::Int, n::Int) where {T}
    return $(Expr(:new, :self, :(new_as_memoryref(fieldtype(self, :ref), checked_dims(m, n))), :((m, n))))
end))
eval(Core, :(function (self::Type{Array{T,3}})(::UndefInitializer, m::Int, n::Int, o::Int) where {T}
    return $(Expr(:new, :self, :(new_as_memoryref(fieldtype(self, :ref), checked_dims(m, n, o))), :((m, n, o))))
end))
eval(Core, :(function (self::Type{Array{T, N}})(::UndefInitializer, d::Vararg{Int, N}) where {T, N}
    return $(Expr(:new, :self, :(new_as_memoryref(fieldtype(self, :ref), checked_dims(d...))), :d))
end))
# type and dimensionality specified, accepting dims as tuples of Ints
(self::Type{Array{T,1}})(::UndefInitializer, d::NTuple{1, Int}) where {T} = self(undef, getfield(d, 1))
(self::Type{Array{T,2}})(::UndefInitializer, d::NTuple{2, Int}) where {T} = self(undef, getfield(d, 1), getfield(d, 2))
(self::Type{Array{T,3}})(::UndefInitializer, d::NTuple{3, Int}) where {T} = self(undef, getfield(d, 1), getfield(d, 2), getfield(d, 3))
(self::Type{Array{T,N}})(::UndefInitializer, d::NTuple{N, Int}) where {T, N} = self(undef, d...)
# type but not dimensionality specified
Array{T}(::UndefInitializer, m::Int) where {T} = Array{T, 1}(undef, m)
Array{T}(::UndefInitializer, m::Int, n::Int) where {T} = Array{T, 2}(undef, m, n)
Array{T}(::UndefInitializer, m::Int, n::Int, o::Int) where {T} = Array{T, 3}(undef, m, n, o)
Array{T}(::UndefInitializer, d::NTuple{N, Int}) where {T, N} = Array{T, N}(undef, d)
# empty vector constructor
(self::Type{Array{T, 1}})() where {T} = self(undef, 0)

(Array{T, N} where T)(x::AbstractArray{S, N}) where {S, N} = Array{S, N}(x)

Array(A::AbstractArray{T, N})    where {T, N}   = Array{T, N}(A)
Array{T}(A::AbstractArray{S, N}) where {T, N, S} = Array{T, N}(A)

AbstractArray{T}(A::AbstractArray{S, N}) where {T, S, N} = AbstractArray{T, N}(A)

# primitive Symbol constructors

## Helper for proper GC rooting without unsafe_convert
eval(Core, quote
    _Symbol(ptr::Ptr{UInt8}, sz::Int, root::Any) = $(Expr(:foreigncall, QuoteNode(:jl_symbol_n),
        Ref{Symbol}, svec(Ptr{UInt8}, Int), 0, QuoteNode(:ccall), :ptr, :sz, :root))
end)

function Symbol(s::String)
    @_foldable_meta
    @noinline
    return _Symbol(ccall(:jl_string_ptr, Ptr{UInt8}, (Any,), s), sizeof(s), s)
end
function Symbol(a::Array{UInt8, 1})
    @noinline
    return _Symbol(bitcast(Ptr{UInt8}, a.ref.ptr_or_offset), getfield(a.size, 1), a.ref.mem)
end
Symbol(s::Symbol) = s

# module providing the IR object model
module IR

export CodeInfo, MethodInstance, CodeInstance, GotoNode, GotoIfNot, ReturnNode,
    NewvarNode, SSAValue, SlotNumber, Argument,
    PiNode, PhiNode, PhiCNode, UpsilonNode, DebugInfo,
    Const, PartialStruct, InterConditional, EnterNode, memoryref

using Core: CodeInfo, MethodInstance, CodeInstance, GotoNode, GotoIfNot, ReturnNode,
    NewvarNode, SSAValue, SlotNumber, Argument,
    PiNode, PhiNode, PhiCNode, UpsilonNode, DebugInfo,
    Const, PartialStruct, InterConditional, EnterNode, memoryref

end # module IR

# docsystem basics
macro doc(x...)
    docex = atdoc(__source__, __module__, x...)
    isa(docex, Expr) && docex.head === :escape && return docex
    return Expr(:escape, Expr(:var"hygienic-scope", docex, typeof(atdoc).name.module, __source__))
end
macro __doc__(x)
    return Expr(:escape, Expr(:block, Expr(:meta, :doc), x))
end

isbasicdoc(@nospecialize x) = (isa(x, Expr) && x.head === :.) || isa(x, Union{QuoteNode, Symbol})
firstarg(arg1, args...) = arg1
iscallexpr(ex::Expr) = (isa(ex, Expr) && ex.head === :where) ? iscallexpr(firstarg(ex.args...)) : (isa(ex, Expr) && ex.head === :call)
iscallexpr(ex) = false
function ignoredoc(source, mod, str, expr)
    (isbasicdoc(expr) || iscallexpr(expr)) && return Expr(:escape, nothing)
    Expr(:escape, expr)
end

global atdoc = ignoredoc
atdoc!(λ)    = global atdoc = λ

# macros for big integer syntax
macro int128_str end
macro uint128_str end
macro big_str end

# macro for command syntax
macro cmd end


# simple stand-alone print definitions for debugging
abstract type IO end
struct CoreSTDOUT <: IO end
struct CoreSTDERR <: IO end
const stdout = CoreSTDOUT()
const stderr = CoreSTDERR()
io_pointer(::CoreSTDOUT) = Intrinsics.pointerref(Intrinsics.cglobal(:jl_uv_stdout, Ptr{Cvoid}), 1, 1)
io_pointer(::CoreSTDERR) = Intrinsics.pointerref(Intrinsics.cglobal(:jl_uv_stderr, Ptr{Cvoid}), 1, 1)

unsafe_write(io::IO, x::Ptr{UInt8}, nb::UInt) =
    (ccall(:jl_uv_puts, Cvoid, (Ptr{Cvoid}, Ptr{UInt8}, UInt), io_pointer(io), x, nb); nb)
unsafe_write(io::IO, x::Ptr{UInt8}, nb::Int) =
    (ccall(:jl_uv_puts, Cvoid, (Ptr{Cvoid}, Ptr{UInt8}, Int), io_pointer(io), x, nb); nb)
write(io::IO, x::UInt8) =
    (ccall(:jl_uv_putb, Cvoid, (Ptr{Cvoid}, UInt8), io_pointer(io), x); 1)
function write(io::IO, x::String)
    nb = sizeof(x)
    unsafe_write(io, ccall(:jl_string_ptr, Ptr{UInt8}, (Any,), x), nb)
    return nb
end

show(io::IO, @nospecialize x) = ccall(:jl_static_show, Cvoid, (Ptr{Cvoid}, Any), io_pointer(io), x)
print(io::IO, x::AbstractChar) = ccall(:jl_uv_putc, Cvoid, (Ptr{Cvoid}, Char), io_pointer(io), x)
print(io::IO, x::String) = (write(io, x); nothing)
print(io::IO, @nospecialize x) = show(io, x)
print(io::IO, @nospecialize(x), @nospecialize a...) = (print(io, x); print(io, a...))
println(io::IO) = (write(io, 0x0a); nothing) # 0x0a = '\n'
println(io::IO, @nospecialize x...) = (print(io, x...); println(io))

show(@nospecialize a) = show(stdout, a)
print(@nospecialize a...) = print(stdout, a...)
println(@nospecialize a...) = println(stdout, a...)

struct GeneratedFunctionStub
    gen
    argnames::SimpleVector
    spnames::SimpleVector
end

# If the generator is a subtype of this trait, inference caches the generated unoptimized
# code, sacrificing memory space to improve the performance of subsequent inferences.
# This tradeoff is not appropriate in general cases (e.g., for `GeneratedFunctionStub`s
# generated from the front end), but it can be justified for generators involving complex
# code transformations, such as a Cassette-like system.
abstract type CachedGenerator end

NamedTuple() = NamedTuple{(),Tuple{}}(())

eval(Core, :(NamedTuple{names}(args::Tuple) where {names} =
             $(Expr(:splatnew, :(NamedTuple{names,typeof(args)}), :args))))

using .Intrinsics: sle_int, add_int

eval(Core, :((NT::Type{NamedTuple{names,T}})(args::T) where {names, T <: Tuple} =
             $(Expr(:splatnew, :NT, :args))))

# constructors for built-in types

import .Intrinsics: eq_int, trunc_int, lshr_int, sub_int, shl_int, bitcast, sext_int, zext_int, and_int

function is_top_bit_set(x)
    @inline
    eq_int(trunc_int(UInt8, lshr_int(x, sub_int(shl_int(sizeof(x), 3), 1))), trunc_int(UInt8, 1))
end

function is_top_bit_set(x::Union{Int8,UInt8})
    @inline
    eq_int(lshr_int(x, 7), trunc_int(typeof(x), 1))
end

# n.b. This function exists for CUDA to overload to configure error behavior (see #48097)
throw_inexacterror(func::Symbol, to, val) = throw(InexactError(func, to, val))

function check_sign_bit(::Type{To}, x) where {To}
    @inline
    # the top bit is the sign bit of x but "sign bit" sounds better in stacktraces
    # n.b. if x is signed, then sizeof(x) === sizeof(To), otherwise sizeof(x) >= sizeof(To)
    is_top_bit_set(x) && throw_inexacterror(sizeof(x) === sizeof(To) ? :convert : :trunc, To, x)
    x
end

function checked_trunc_sint(::Type{To}, x::From) where {To,From}
    @inline
    y = trunc_int(To, x)
    back = sext_int(From, y)
    eq_int(x, back) || throw_inexacterror(:trunc, To, x)
    y
end

function checked_trunc_uint(::Type{To}, x::From) where {To,From}
    @inline
    y = trunc_int(To, x)
    back = zext_int(From, y)
    eq_int(x, back) || throw_inexacterror(:trunc, To, x)
    y
end

toInt8(x::Int8)       = x
toInt8(x::Int16)      = checked_trunc_sint(Int8, x)
toInt8(x::Int32)      = checked_trunc_sint(Int8, x)
toInt8(x::Int64)      = checked_trunc_sint(Int8, x)
toInt8(x::Int128)     = checked_trunc_sint(Int8, x)
toInt8(x::UInt8)      = bitcast(Int8, check_sign_bit(Int8, x))
toInt8(x::UInt16)     = checked_trunc_sint(Int8, check_sign_bit(Int8, x))
toInt8(x::UInt32)     = checked_trunc_sint(Int8, check_sign_bit(Int8, x))
toInt8(x::UInt64)     = checked_trunc_sint(Int8, check_sign_bit(Int8, x))
toInt8(x::UInt128)    = checked_trunc_sint(Int8, check_sign_bit(Int8, x))
toInt8(x::Bool)       = and_int(bitcast(Int8, x), Int8(1))
toInt16(x::Int8)      = sext_int(Int16, x)
toInt16(x::Int16)     = x
toInt16(x::Int32)     = checked_trunc_sint(Int16, x)
toInt16(x::Int64)     = checked_trunc_sint(Int16, x)
toInt16(x::Int128)    = checked_trunc_sint(Int16, x)
toInt16(x::UInt8)     = zext_int(Int16, x)
toInt16(x::UInt16)    = bitcast(Int16, check_sign_bit(Int16, x))
toInt16(x::UInt32)    = checked_trunc_sint(Int16, check_sign_bit(Int16, x))
toInt16(x::UInt64)    = checked_trunc_sint(Int16, check_sign_bit(Int16, x))
toInt16(x::UInt128)   = checked_trunc_sint(Int16, check_sign_bit(Int16, x))
toInt16(x::Bool)      = and_int(zext_int(Int16, x), Int16(1))
toInt32(x::Int8)      = sext_int(Int32, x)
toInt32(x::Int16)     = sext_int(Int32, x)
toInt32(x::Int32)     = x
toInt32(x::Int64)     = checked_trunc_sint(Int32, x)
toInt32(x::Int128)    = checked_trunc_sint(Int32, x)
toInt32(x::UInt8)     = zext_int(Int32, x)
toInt32(x::UInt16)    = zext_int(Int32, x)
toInt32(x::UInt32)    = bitcast(Int32, check_sign_bit(Int32, x))
toInt32(x::UInt64)    = checked_trunc_sint(Int32, check_sign_bit(Int32, x))
toInt32(x::UInt128)   = checked_trunc_sint(Int32, check_sign_bit(Int32, x))
toInt32(x::Bool)      = and_int(zext_int(Int32, x), Int32(1))
toInt64(x::Int8)      = sext_int(Int64, x)
toInt64(x::Int16)     = sext_int(Int64, x)
toInt64(x::Int32)     = sext_int(Int64, x)
toInt64(x::Int64)     = x
toInt64(x::Int128)    = checked_trunc_sint(Int64, x)
toInt64(x::UInt8)     = zext_int(Int64, x)
toInt64(x::UInt16)    = zext_int(Int64, x)
toInt64(x::UInt32)    = zext_int(Int64, x)
toInt64(x::UInt64)    = bitcast(Int64, check_sign_bit(Int64, x))
toInt64(x::UInt128)   = checked_trunc_sint(Int64, check_sign_bit(Int64, x))
toInt64(x::Bool)      = and_int(zext_int(Int64, x), Int64(1))
toInt128(x::Int8)     = sext_int(Int128, x)
toInt128(x::Int16)    = sext_int(Int128, x)
toInt128(x::Int32)    = sext_int(Int128, x)
toInt128(x::Int64)    = sext_int(Int128, x)
toInt128(x::Int128)   = x
toInt128(x::UInt8)    = zext_int(Int128, x)
toInt128(x::UInt16)   = zext_int(Int128, x)
toInt128(x::UInt32)   = zext_int(Int128, x)
toInt128(x::UInt64)   = zext_int(Int128, x)
toInt128(x::UInt128)  = bitcast(Int128, check_sign_bit(Int128, x))
toInt128(x::Bool)     = and_int(zext_int(Int128, x), Int128(1))
toUInt8(x::Int8)      = bitcast(UInt8, check_sign_bit(UInt8, x))
toUInt8(x::Int16)     = checked_trunc_uint(UInt8, x)
toUInt8(x::Int32)     = checked_trunc_uint(UInt8, x)
toUInt8(x::Int64)     = checked_trunc_uint(UInt8, x)
toUInt8(x::Int128)    = checked_trunc_uint(UInt8, x)
toUInt8(x::UInt8)     = x
toUInt8(x::UInt16)    = checked_trunc_uint(UInt8, x)
toUInt8(x::UInt32)    = checked_trunc_uint(UInt8, x)
toUInt8(x::UInt64)    = checked_trunc_uint(UInt8, x)
toUInt8(x::UInt128)   = checked_trunc_uint(UInt8, x)
toUInt8(x::Bool)      = and_int(bitcast(UInt8, x), UInt8(1))
toUInt16(x::Int8)     = sext_int(UInt16, check_sign_bit(UInt16, x))
toUInt16(x::Int16)    = bitcast(UInt16, check_sign_bit(UInt16, x))
toUInt16(x::Int32)    = checked_trunc_uint(UInt16, x)
toUInt16(x::Int64)    = checked_trunc_uint(UInt16, x)
toUInt16(x::Int128)   = checked_trunc_uint(UInt16, x)
toUInt16(x::UInt8)    = zext_int(UInt16, x)
toUInt16(x::UInt16)   = x
toUInt16(x::UInt32)   = checked_trunc_uint(UInt16, x)
toUInt16(x::UInt64)   = checked_trunc_uint(UInt16, x)
toUInt16(x::UInt128)  = checked_trunc_uint(UInt16, x)
toUInt16(x::Bool)     = and_int(zext_int(UInt16, x), UInt16(1))
toUInt32(x::Int8)     = sext_int(UInt32, check_sign_bit(UInt32, x))
toUInt32(x::Int16)    = sext_int(UInt32, check_sign_bit(UInt32, x))
toUInt32(x::Int32)    = bitcast(UInt32, check_sign_bit(UInt32, x))
toUInt32(x::Int64)    = checked_trunc_uint(UInt32, x)
toUInt32(x::Int128)   = checked_trunc_uint(UInt32, x)
toUInt32(x::UInt8)    = zext_int(UInt32, x)
toUInt32(x::UInt16)   = zext_int(UInt32, x)
toUInt32(x::UInt32)   = x
toUInt32(x::UInt64)   = checked_trunc_uint(UInt32, x)
toUInt32(x::UInt128)  = checked_trunc_uint(UInt32, x)
toUInt32(x::Bool)     = and_int(zext_int(UInt32, x), UInt32(1))
toUInt64(x::Int8)     = sext_int(UInt64, check_sign_bit(UInt64, x))
toUInt64(x::Int16)    = sext_int(UInt64, check_sign_bit(UInt64, x))
toUInt64(x::Int32)    = sext_int(UInt64, check_sign_bit(UInt64, x))
toUInt64(x::Int64)    = bitcast(UInt64, check_sign_bit(UInt64, x))
toUInt64(x::Int128)   = checked_trunc_uint(UInt64, x)
toUInt64(x::UInt8)    = zext_int(UInt64, x)
toUInt64(x::UInt16)   = zext_int(UInt64, x)
toUInt64(x::UInt32)   = zext_int(UInt64, x)
toUInt64(x::UInt64)   = x
toUInt64(x::UInt128)  = checked_trunc_uint(UInt64, x)
toUInt64(x::Bool)     = and_int(zext_int(UInt64, x), UInt64(1))
toUInt128(x::Int8)    = sext_int(UInt128, check_sign_bit(UInt128, x))
toUInt128(x::Int16)   = sext_int(UInt128, check_sign_bit(UInt128, x))
toUInt128(x::Int32)   = sext_int(UInt128, check_sign_bit(UInt128, x))
toUInt128(x::Int64)   = sext_int(UInt128, check_sign_bit(UInt128, x))
toUInt128(x::Int128)  = bitcast(UInt128, check_sign_bit(UInt128, x))
toUInt128(x::UInt8)   = zext_int(UInt128, x)
toUInt128(x::UInt16)  = zext_int(UInt128, x)
toUInt128(x::UInt32)  = zext_int(UInt128, x)
toUInt128(x::UInt64)  = zext_int(UInt128, x)
toUInt128(x::UInt128) = x
toUInt128(x::Bool)    = and_int(zext_int(UInt128, x), UInt128(1))

# TODO: this is here to work around the 4 method limit in inference (#23210).
const BuiltinInts = Union{Int128, Int16, Int32, Int64, Int8, UInt128, UInt16, UInt32, UInt64, UInt8, Bool}
Int8(x::BuiltinInts)    = toInt8(x)::Int8
Int16(x::BuiltinInts)   = toInt16(x)::Int16
Int32(x::BuiltinInts)   = toInt32(x)::Int32
Int64(x::BuiltinInts)   = toInt64(x)::Int64
Int128(x::BuiltinInts)  = toInt128(x)::Int128
UInt8(x::BuiltinInts)   = toUInt8(x)::UInt8
UInt16(x::BuiltinInts)  = toUInt16(x)::UInt16
UInt32(x::BuiltinInts)  = toUInt32(x)::UInt32
UInt64(x::BuiltinInts)  = toUInt64(x)::UInt64
UInt128(x::BuiltinInts) = toUInt128(x)::UInt128

(::Type{T})(x::T) where {T<:Number} = x

Int(x::Ptr)  = bitcast(Int, x)
UInt(x::Ptr) = bitcast(UInt, x)
if Int === Int32
Int64(x::Ptr) = Int64(UInt32(x))
UInt64(x::Ptr) = UInt64(UInt32(x))
end
(PT::Type{Ptr{T}} where T)(x::Union{Int,UInt,Ptr}=0) = bitcast(PT, x)
(AS::Type{AddrSpace{Backend}} where Backend)(x::UInt8) = bitcast(AS, x)

Signed(x::UInt8)    = Int8(x)
Unsigned(x::Int8)   = UInt8(x)
Signed(x::UInt16)   = Int16(x)
Unsigned(x::Int16)  = UInt16(x)
Signed(x::UInt32)   = Int32(x)
Unsigned(x::Int32)  = UInt32(x)
Signed(x::UInt64)   = Int64(x)
Unsigned(x::Int64)  = UInt64(x)
Signed(x::UInt128)  = Int128(x)
Unsigned(x::Int128) = UInt128(x)

Signed(x::Union{Float16, Float32, Float64, Bool})   = Int(x)
Unsigned(x::Union{Float16, Float32, Float64, Bool}) = UInt(x)

Integer(x::Integer) = x
Integer(x::Union{Float16, Float32, Float64}) = Int(x)

# During definition of struct type `B`, if an `A.B` expression refers to
# the eventual global name of the struct, then return the partially-initialized
# type object.
# TODO: remove. This is a shim for backwards compatibility.
function struct_name_shim(@nospecialize(x), name::Symbol, mod::Module, @nospecialize(t))
    return x === mod ? t : getfield(x, name)
end

# Binding for the julia parser, called as
#
#    Core._parse(text, filename, lineno, offset, options)
#
# Parse Julia code from the buffer `text`, starting at `offset` and attributing
# it to `filename`. `text` may be a `String` or `svec(ptr::Ptr{UInt8},
# len::Int)` for a raw unmanaged buffer. `options` should be one of `:atom`,
# `:statement` or `:all`, indicating how much the parser will consume.
#
# `_parse` must return an `svec` containing an `Expr` and the new offset as an
# `Int`.
#
# The internal jl_parse will call into Core._parse if not `nothing`.
_parse = nothing

_setparser!(parser) = setglobal!(Core, :_parse, parser)

# support for deprecated uses of internal _apply function
_apply(x...) = Core._apply_iterate(Main.Base.iterate, x...)

struct Pair{A, B}
    first::A
    second::B
    # if we didn't inline this, it's probably because the callsite was actually dynamic
    # to avoid potentially compiling many copies of this, we mark the arguments with `@nospecialize`
    # but also mark the whole function with `@inline` to ensure we will inline it whenever possible
    # (even if `convert(::Type{A}, a::A)` for some reason was expensive)
    Pair(a, b) = new{typeof(a), typeof(b)}(a, b)
    function Pair{A, B}(@nospecialize(a), @nospecialize(b)) where {A, B}
        @inline
        return new(a::A, b::B)
    end
end

function _hasmethod(@nospecialize(tt)) # this function has a special tfunc
    world = ccall(:jl_get_tls_world_age, UInt, ()) # tls_world_age()
    return Intrinsics.not_int(ccall(:jl_gf_invoke_lookup, Any, (Any, Any, UInt), tt, nothing, world) === nothing)
end

# for backward compat
arrayref(inbounds::Bool, A::Array, i::Int...) = Main.Base.getindex(A, i...)
const_arrayref(inbounds::Bool, A::Array, i::Int...) = Main.Base.getindex(A, i...)
arrayset(inbounds::Bool, A::Array{T}, x::Any, i::Int...) where {T} = Main.Base.setindex!(A, x::T, i...)
arraysize(a::Array) = a.size
arraysize(a::Array, i::Int) = sle_int(i, nfields(a.size)) ? getfield(a.size, i) : 1
export arrayref, arrayset, arraysize, const_arrayref
const check_top_bit = check_sign_bit

# For convenience
EnterNode(old::EnterNode, new_dest::Int) = isdefined(old, :scope) ?
    EnterNode(new_dest, old.scope) : EnterNode(new_dest)

# typename(_).constprop_heuristic
const FORCE_CONST_PROP      = 0x1
const ARRAY_INDEX_HEURISTIC = 0x2
const ITERATE_HEURISTIC     = 0x3
const SAMETYPE_HEURISTIC    = 0x4

# `typename` has special tfunc support in inference to improve
# the result for `Type{Union{...}}`. It is defined here, so that the Compiler
# can look it up by value.
struct TypeNameError <: Exception
    a
    TypeNameError(@nospecialize(a)) = new(a)
end

typename(a) = throw(TypeNameError(a))
typename(a::DataType) = a.name
function typename(a::Union)
    ta = typename(a.a)
    tb = typename(a.b)
    ta === tb || throw(TypeNameError(a))
    return tb
end
typename(union::UnionAll) = typename(union.body)

# Special inference support to avoid execess specialization of these methods.
# TODO: Replace this by a generic heuristic.
(>:)(@nospecialize(a), @nospecialize(b)) = (b <: a)
(!==)(@nospecialize(a), @nospecialize(b)) = Intrinsics.not_int(a === b)

include(Core, "optimized_generics.jl")

ccall(:jl_set_istopmod, Cvoid, (Any, Bool), Core, true)

JuliaLang / julia / #38002

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