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opaque_closure.jl
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opaque_closure.jl
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# This file is a part of Julia. License is MIT: https://julialang.org/license
"""
@opaque ([type, ]args...) -> body
Marks a given closure as "opaque". Opaque closures capture the
world age of their creation (as opposed to their invocation).
This allows for more aggressive optimization of the capture
list, but trades off against the ability to inline opaque
closures at the call site, if their creation is not statically
visible.
An argument tuple type (`type`) may optionally be specified, to
specify allowed argument types in a more flexible way. In particular,
the argument type may be fixed length even if the function is variadic.
!!! warning
This interface is experimental and subject to change or removal without notice.
"""
macro opaque(ex)
esc(Expr(:opaque_closure, ex))
end
macro opaque(ty, ex)
esc(Expr(:opaque_closure, ty, ex))
end
# OpaqueClosure construction from pre-inferred CodeInfo/IRCode
using Core.Compiler: IRCode, SSAValue
using Core: CodeInfo
function compute_ir_rettype(ir::IRCode)
rt = Union{}
for i = 1:length(ir.stmts)
stmt = ir[SSAValue(i)][:stmt]
if isa(stmt, Core.Compiler.ReturnNode) && isdefined(stmt, :val)
rt = Core.Compiler.tmerge(Core.Compiler.argextype(stmt.val, ir), rt)
end
end
return Core.Compiler.widenconst(rt)
end
function compute_oc_signature(ir::IRCode, nargs::Int, isva::Bool)
argtypes = Vector{Any}(undef, nargs)
for i = 1:nargs
argtypes[i] = Core.Compiler.widenconst(ir.argtypes[i+1])
end
if isva
lastarg = pop!(argtypes)
if lastarg <: Tuple
append!(argtypes, lastarg.parameters)
else
push!(argtypes, Vararg{Any})
end
end
return Tuple{argtypes...}
end
function Core.OpaqueClosure(ir::IRCode, @nospecialize env...;
isva::Bool = false,
slotnames::Union{Nothing,Vector{Symbol}}=nothing,
kwargs...)
# NOTE: we need ir.argtypes[1] == typeof(env)
ir = Core.Compiler.copy(ir)
# if the user didn't specify a definition MethodInstance or filename Symbol to use for the debuginfo, set a filename now
ir.debuginfo.def === nothing && (ir.debuginfo.def = :var"generated IR for OpaqueClosure")
nargtypes = length(ir.argtypes)
nargs = nargtypes-1
sig = compute_oc_signature(ir, nargs, isva)
rt = compute_ir_rettype(ir)
src = ccall(:jl_new_code_info_uninit, Ref{CodeInfo}, ())
if slotnames === nothing
src.slotnames = fill(:none, nargtypes)
else
length(slotnames) == nargtypes || error("mismatched `argtypes` and `slotnames`")
src.slotnames = slotnames
end
src.slotflags = fill(zero(UInt8), nargtypes)
src.slottypes = copy(ir.argtypes)
src.isva = isva
src.nargs = nargtypes
src = Core.Compiler.ir_to_codeinf!(src, ir)
src.rettype = rt
return generate_opaque_closure(sig, Union{}, rt, src, nargs, isva, env...; kwargs...)
end
function Core.OpaqueClosure(src::CodeInfo, @nospecialize env...; rettype, sig, nargs, isva=false, kwargs...)
return generate_opaque_closure(sig, Union{}, rettype, src, nargs, isva, env...; kwargs...)
end
function generate_opaque_closure(@nospecialize(sig), @nospecialize(rt_lb), @nospecialize(rt_ub),
src::CodeInfo, nargs::Int, isva::Bool, @nospecialize env...;
mod::Module=@__MODULE__,
lineno::Int=0,
file::Union{Nothing,Symbol}=nothing,
do_compile::Bool=true,
isinferred::Bool=true)
return ccall(:jl_new_opaque_closure_from_code_info, Any, (Any, Any, Any, Any, Any, Cint, Any, Cint, Cint, Any, Cint, Cint),
sig, rt_lb, rt_ub, mod, src, lineno, file, nargs, isva, env, do_compile, isinferred)
end