Use normal RuntimeGeneratedFunction constructor rather than macro

Now that users need to manually call init(), this macro really doesn't
do much and obscures the scope which the function will pull global
symbols from.

src/RuntimeGeneratedFunctions.jl

@@ -2,31 +2,16 @@ module RuntimeGeneratedFunctions
 
 using ExprTools, Serialization, SHA
 
-export @RuntimeGeneratedFunction
+export RuntimeGeneratedFunction, @RuntimeGeneratedFunction
 
 
 """
-    RuntimeGeneratedFunction
+    RuntimeGeneratedFunction(module, function_expression)
 
-This type should be constructed via the macro @RuntimeGeneratedFunction.
-"""
-struct RuntimeGeneratedFunction{argnames,moduletag,id} <: Function
-    body::Expr
-    function RuntimeGeneratedFunction(moduletag, ex)
-        def = splitdef(ex)
-        args, body = normalize_args(def[:args]), def[:body]
-        id = expr_to_id(body)
-        cached_body = _cache_body(moduletag, id, body)
-        new{Tuple(args),moduletag,id}(cached_body)
-    end
-end
-
-"""
-    @RuntimeGeneratedFunction(function_expression)
-
-Construct a function from `function_expression` which can be called immediately
-without world age problems. Somewhat like using `eval(function_expression)` and
-then calling the resulting function. The differences are:
+Construct a function from `function_expression` in the scope of `module` which
+can be called immediately without world age problems. Somewhat like using
+`eval(function_expression)` and then calling the resulting function. The
+differences are:
 
 * The result can be called immediately (immune to world age errors)
 * The result is not a named generic function, and doesn't participate in
@@ -41,21 +26,32 @@ RuntimeGeneratedFunctions.init(@__MODULE__) # Required at module top-level
 
 function foo()
     expression = :((x,y)->x+y+1) # May be generated dynamically
-    f = @RuntimeGeneratedFunction(expression)
+    f = RuntimeGeneratedFunction(@__MODULE__, expression)
     f(1,2) # May be called immediately
 end
 ```
 """
-macro RuntimeGeneratedFunction(ex)
-    quote
-        if !($(esc(:(@isdefined($_tagname)))))
+struct RuntimeGeneratedFunction{argnames,moduletag,id} <: Function
+    body::Expr
+    function RuntimeGeneratedFunction(mod::Module, ex)
+        if !isdefined(mod, _tagname)
             error("""You must use `RuntimeGeneratedFunctions.init(@__MODULE__)` at module
                      top level before using runtime generated functions""")
         end
-        RuntimeGeneratedFunction(
-            $(esc(_tagname)),
-            $(esc(ex))
-        )
+        moduletag = getfield(mod, _tagname)
+        def = splitdef(ex)
+        args, body = normalize_args(def[:args]), def[:body]
+        id = expr_to_id(body)
+        cached_body = _cache_body(moduletag, id, body)
+        new{Tuple(args),moduletag,id}(cached_body)
+    end
+end
+
+
+macro RuntimeGeneratedFunction(ex)
+    Base.depwarn("`@RuntimeGeneratedFunction(ex)` is deprecated, use `RuntimeGeneratedFunction(@__MODULE__, ex)` instead.", :RuntimeGeneratedFunction)
+    quote
+        RuntimeGeneratedFunction(@__MODULE__, $(esc(ex)))
     end
 end
 
@@ -68,7 +64,7 @@ end
 (f::RuntimeGeneratedFunction)(args::Vararg{Any,N}) where N = generated_callfunc(f, args...)
 
 # We'll generate a method of this function in every module which wants to use
-# @RuntimeGeneratedFunction
+# RuntimeGeneratedFunction
 function generated_callfunc end
 
 function generated_callfunc_body(argnames, moduletag, id, __args)
@@ -138,7 +134,7 @@ end
     RuntimeGeneratedFunctions.init(mod)
 
 Use this at top level to set up your module `mod` before using
-`@RuntimeGeneratedFunction`.
+`RuntimeGeneratedFunction(mod, ...)`.
 """
 function init(mod)
     lock(_cache_lock) do

test/precomp/RGFPrecompTest.jl

@@ -2,5 +2,5 @@ module RGFPrecompTest
     using RuntimeGeneratedFunctions
     RuntimeGeneratedFunctions.init(@__MODULE__)
 
-    f = @RuntimeGeneratedFunction(:((x,y)->x+y))
+    f = RuntimeGeneratedFunction(@__MODULE__, :((x,y)->x+y))
 end

test/runtests.jl

@@ -27,9 +27,9 @@ ex3 = :(function (_du::T,_u::Vector{E},_p::P,_t::Any) where {T<:Vector,E,P}
     nothing
 end)
 
-f1 = @RuntimeGeneratedFunction(ex1)
-f2 = @RuntimeGeneratedFunction(ex2)
-f3 = @RuntimeGeneratedFunction(ex3)
+f1 = RuntimeGeneratedFunction(@__MODULE__, ex1)
+f2 = RuntimeGeneratedFunction(@__MODULE__, ex2)
+f3 = RuntimeGeneratedFunction(@__MODULE__, ex3)
 
 @test f1 isa Function
 
@@ -62,7 +62,7 @@ function no_worldage()
         @inbounds _du[2] = _u[2]
         nothing
     end)
-    f1 = @RuntimeGeneratedFunction(ex)
+    f1 = RuntimeGeneratedFunction(@__MODULE__, ex)
     du = rand(2)
     u = rand(2)
     p = nothing
@@ -72,7 +72,7 @@ end
 @test no_worldage() === nothing
 
 # Test show()
-@test sprint(show, @RuntimeGeneratedFunction(Base.remove_linenums!(:((x,y)->x+y+1)))) ==
+@test sprint(show, RuntimeGeneratedFunction(@__MODULE__, Base.remove_linenums!(:((x,y)->x+y+1)))) ==
      """
      RuntimeGeneratedFunction(#=in $(@__MODULE__)=#, :((x, y)->begin
                x + y + 1
@@ -86,9 +86,9 @@ using RGFPrecompTest
 
 # Test that RuntimeGeneratedFunction with identical body expressions (but
 # allocated separately) don't clobber each other when one is GC'd.
-f_gc = @RuntimeGeneratedFunction(Base.remove_linenums!(:((x,y)->x+y+100001)))
+f_gc = RuntimeGeneratedFunction(@__MODULE__, Base.remove_linenums!(:((x,y)->x+y+100001)))
 let
-    @RuntimeGeneratedFunction(Base.remove_linenums!(:((x,y)->x+y+100001)))
+    RuntimeGeneratedFunction(@__MODULE__, Base.remove_linenums!(:((x,y)->x+y+100001)))
 end
 GC.gc()
 @test f_gc(1,-1) == 100001
@@ -100,7 +100,7 @@ for k=1:4
         t = Threads.@spawn begin
             r = Bool[]
             for i=1:100
-                f = @RuntimeGeneratedFunction(Base.remove_linenums!(:((x,y)->x+y+$i*$k)))
+                f = RuntimeGeneratedFunction(@__MODULE__, Base.remove_linenums!(:((x,y)->x+y+$i*$k)))
                 x = 1; y = 2;
                 push!(r, f(x,y) == x + y + i*k)
             end
@@ -119,13 +119,13 @@ module GlobalsTest
     RuntimeGeneratedFunctions.init(@__MODULE__)
 
     y = 40
-    f = @RuntimeGeneratedFunction(:(x->x+y))
+    f = RuntimeGeneratedFunction(@__MODULE__, :(x->x+y))
 end
 
 @test GlobalsTest.f(2) == 42
 
 @test_throws ErrorException @eval(module NotInitTest
     using RuntimeGeneratedFunctions
     # RuntimeGeneratedFunctions.init(@__MODULE__) # <-- missing
-    f = @RuntimeGeneratedFunction(:(x->x+y))
+    f = RuntimeGeneratedFunction(@__MODULE__, :(x->x+y))
 end)