Add ABIOverride type for def field

Together with #54899, this PR is intending to replicate the functionality
of #54373, which allowed particular specializations to have a different
ABI signature than what would be suggested by the MethodInstance's
`specTypes` field. This PR handles that by adding a special `ABIOverwrite`
type, which, when placed in the `def` field of a `CodeInstance`
instructs the system to use the given signature instead.

Compiler/src/Compiler.jl

@@ -46,7 +46,7 @@ import Core: print, println, show, write, unsafe_write,
              MethodInstance, CodeInstance, MethodTable, MethodMatch, PartialOpaque,
              TypeofVararg, Core, SimpleVector, donotdelete, compilerbarrier,
              memoryref_isassigned, memoryrefnew, memoryrefoffset, memoryrefget,
-             memoryrefset!, typename
+             memoryrefset!, typename, ABIOverride
 
 using Base
 using Base: Ordering, vect, EffectsOverride, BitVector, @_gc_preserve_begin, @_gc_preserve_end, RefValue,

Compiler/src/abstractinterpretation.jl

@@ -2212,6 +2212,18 @@ function abstract_call_unionall(interp::AbstractInterpreter, argtypes::Vector{An
     return CallMeta(ret, Any, Effects(EFFECTS_TOTAL; nothrow), call.info)
 end
 
+function ci_abi(ci::CodeInstance)
+    def = ci.def
+    isa(def, ABIOverride) && return def.abi
+    (def::MethodInstance).specTypes
+end
+
+function get_ci_mi(ci::CodeInstance)
+    def = ci.def
+    isa(def, ABIOverride) && return def.def
+    return def::MethodInstance
+end
+
 function abstract_invoke(interp::AbstractInterpreter, arginfo::ArgInfo, si::StmtInfo, sv::AbsIntState)
     argtypes = arginfo.argtypes
     ft′ = argtype_by_index(argtypes, 2)
@@ -2223,12 +2235,12 @@ function abstract_invoke(interp::AbstractInterpreter, arginfo::ArgInfo, si::Stmt
         if isa(method_or_ci, CodeInstance)
             our_world = sv.world.this
             argtype = argtypes_to_type(pushfirst!(argtype_tail(argtypes, 4), ft))
-            specsig = method_or_ci.def.specTypes
-            defdef = method_or_ci.def.def
+            specsig = ci_abi(method_or_ci)
+            defdef = get_ci_mi(method_or_ci).def
             exct = method_or_ci.exctype
             if !hasintersect(argtype, specsig)
                 return Future(CallMeta(Bottom, TypeError, EFFECTS_THROWS, NoCallInfo()))
-            elseif !(argtype <: specsig) || (isa(defdef, Method) && !(argtype <: defdef.sig))
+            elseif !(argtype <: specsig) || ((!isa(method_or_ci.def, ABIOverride) && isa(defdef, Method)) && !(argtype <: defdef.sig))
                 exct = Union{exct, TypeError}
             end
             callee_valid_range = WorldRange(method_or_ci.min_world, method_or_ci.max_world)

Compiler/src/ssair/show.jl

@@ -100,11 +100,17 @@ function print_stmt(io::IO, idx::Int, @nospecialize(stmt), code::Union{IRCode,Co
         if !(mi isa Core.MethodInstance)
             mi = (mi::Core.CodeInstance).def
         end
+        if isa(mi, Core.ABIOverride)
+            abi = mi.abi
+            mi = mi.def
+        else
+            abi = mi.specTypes
+        end
         show_unquoted(io, stmt.args[2], indent)
         print(io, "(")
         # XXX: this is wrong if `sig` is not a concretetype method
         # more correct would be to use `fieldtype(sig, i)`, but that would obscure / discard Varargs information in show
-        sig = mi.specTypes == Tuple ? Core.svec() : Base.unwrap_unionall(mi.specTypes).parameters::Core.SimpleVector
+        sig = abi == Tuple ? Core.svec() : Base.unwrap_unionall(abi).parameters::Core.SimpleVector
         print_arg(i) = sprint(; context=io) do io
             show_unquoted(io, stmt.args[i], indent)
             if (i - 1) <= length(sig)

Compiler/src/stmtinfo.jl

@@ -71,7 +71,7 @@ function _add_edges_impl(edges::Vector{Any}, info::MethodMatchInfo, mi_edge::Boo
             mi = specialize_method(m) # don't allow `Method`-edge for this optimized format
             edge = mi
         else
-            mi = edge.def
+            mi = edge.def::MethodInstance
         end
         if mi.specTypes === m.spec_types
             add_one_edge!(edges, edge)
@@ -103,7 +103,7 @@ function add_one_edge!(edges::Vector{Any}, edge::MethodInstance)
     while i <= length(edges)
         edgeᵢ = edges[i]
         edgeᵢ isa Int && (i += 2 + edgeᵢ; continue)
-        edgeᵢ isa CodeInstance && (edgeᵢ = edgeᵢ.def)
+        edgeᵢ isa CodeInstance && (edgeᵢ = get_ci_mi(edgeᵢ))
         edgeᵢ isa MethodInstance || (i += 1; continue)
         if edgeᵢ === edge && !(i > 1 && edges[i-1] isa Type)
             return # found existing covered edge
@@ -118,7 +118,7 @@ function add_one_edge!(edges::Vector{Any}, edge::CodeInstance)
     while i <= length(edges)
         edgeᵢ_orig = edgeᵢ = edges[i]
         edgeᵢ isa Int && (i += 2 + edgeᵢ; continue)
-        edgeᵢ isa CodeInstance && (edgeᵢ = edgeᵢ.def)
+        edgeᵢ isa CodeInstance && (edgeᵢ = get_ci_mi(edgeᵢ))
         edgeᵢ isa MethodInstance || (i += 1; continue)
         if edgeᵢ === edge.def && !(i > 1 && edges[i-1] isa Type)
             if edgeᵢ_orig isa MethodInstance
@@ -385,7 +385,7 @@ function add_inlining_edge!(edges::Vector{Any}, edge::CodeInstance)
         i += 1
     end
     # add_invoke_edge alone
-    push!(edges, (edge.def.def::Method).sig)
+    push!(edges, (get_ci_mi(edge).def::Method).sig)
     push!(edges, edge)
     nothing
 end

Compiler/src/typeinfer.jl

@@ -528,7 +528,7 @@ function store_backedges(caller::CodeInstance, edges::SimpleVector)
                 i += 2
                 continue
             elseif isa(callee, CodeInstance)
-                callee = callee.def
+                callee = get_ci_mi(callee)
             end
             ccall(:jl_method_instance_add_backedge, Cvoid, (Any, Any, Any), callee, item, caller)
             i += 2

base/arrayshow.jl

@@ -41,7 +41,7 @@ Accept keyword args `c` for alternate single character marker.
 """
 function replace_with_centered_mark(s::AbstractString;c::AbstractChar = '⋅')
     N = textwidth(ANSIIterator(s))
-    return join(setindex!([" " for i=1:N],string(c),ceil(Int,N/2)))
+    return N == 0 ? string(c) : join(setindex!([" " for i=1:N],string(c),ceil(Int,N/2)))
 end
 
 const undef_ref_alignment = (3,3)

base/boot.jl

@@ -465,6 +465,12 @@ struct InitError <: WrappedException
     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
@@ -552,7 +558,7 @@ end
 
 
 function CodeInstance(
-    mi::MethodInstance, owner, @nospecialize(rettype), @nospecialize(exctype), @nospecialize(inferred_const),
+    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),
     relocatability::UInt8, di::Union{DebugInfo,Nothing}, edges::SimpleVector)

base/show.jl

@@ -1353,7 +1353,13 @@ end
 show(io::IO, mi::Core.MethodInstance) = show_mi(io, mi)
 function show(io::IO, codeinst::Core.CodeInstance)
     print(io, "CodeInstance for ")
-    show_mi(io, codeinst.def)
+    def = codeinst.def
+    if isa(def, Core.ABIOverride)
+        show_mi(io, def.def)
+        print(io, " (ABI Overridden)")
+    else
+        show_mi(io, def::MethodInstance)
+    end
 end
 
 function show_mi(io::IO, mi::Core.MethodInstance, from_stackframe::Bool=false)

src/aotcompile.cpp

@@ -105,7 +105,7 @@ jl_get_llvm_mis_impl(void *native_code, size_t *num_elements, jl_method_instance
     assert(*num_elements == map.size());
     size_t i = 0;
     for (auto &ci : map) {
-        data[i++] = ci.first->def;
+        data[i++] = jl_get_ci_mi(ci.first);
     }
 }
 
@@ -455,14 +455,14 @@ static void compile_workqueue(jl_codegen_params_t &params, egal_set &method_root
                 if ((policy != CompilationPolicy::Default || params.params->trim) &&
                     jl_atomic_load_relaxed(&codeinst->inferred) == jl_nothing) {
                     // XXX: SOURCE_MODE_FORCE_SOURCE is wrong here (neither sufficient nor necessary)
-                    codeinst = jl_type_infer(codeinst->def, jl_atomic_load_relaxed(&codeinst->max_world), SOURCE_MODE_FORCE_SOURCE);
+                    codeinst = jl_type_infer(jl_get_ci_mi(codeinst), jl_atomic_load_relaxed(&codeinst->max_world), SOURCE_MODE_FORCE_SOURCE);
                 }
                 if (codeinst) {
                     orc::ThreadSafeModule result_m =
-                        jl_create_ts_module(name_from_method_instance(codeinst->def),
+                        jl_create_ts_module(name_from_method_instance(jl_get_ci_mi(codeinst)),
                             params.tsctx, params.DL, params.TargetTriple);
                     auto decls = jl_emit_codeinst(result_m, codeinst, NULL, params);
-                    record_method_roots(method_roots, codeinst->def);
+                    record_method_roots(method_roots, jl_get_ci_mi(codeinst));
                     if (result_m)
                         it = compiled_functions.insert(std::make_pair(codeinst, std::make_pair(std::move(result_m), std::move(decls)))).first;
                 }
@@ -501,7 +501,7 @@ static void compile_workqueue(jl_codegen_params_t &params, egal_set &method_root
             proto.decl->setLinkage(GlobalVariable::InternalLinkage);
             //protodecl->setAlwaysInline();
             jl_init_function(proto.decl, params.TargetTriple);
-            jl_method_instance_t *mi = codeinst->def;
+            jl_method_instance_t *mi = jl_get_ci_mi(codeinst);
             size_t nrealargs = jl_nparams(mi->specTypes); // number of actual arguments being passed
             bool is_opaque_closure = jl_is_method(mi->def.value) && mi->def.method->is_for_opaque_closure;
             // TODO: maybe this can be cached in codeinst->specfptr?
@@ -641,12 +641,12 @@ void *jl_create_native_impl(jl_array_t *methods, LLVMOrcThreadSafeModuleRef llvm
                         data->jl_fvar_map[codeinst] = std::make_tuple((uint32_t)-3, (uint32_t)-3);
                     }
                     else {
-                        orc::ThreadSafeModule result_m = jl_create_ts_module(name_from_method_instance(codeinst->def),
+                        orc::ThreadSafeModule result_m = jl_create_ts_module(name_from_method_instance(jl_get_ci_mi(codeinst)),
                                 params.tsctx, clone.getModuleUnlocked()->getDataLayout(),
                                 Triple(clone.getModuleUnlocked()->getTargetTriple()));
                         jl_llvm_functions_t decls = jl_emit_codeinst(result_m, codeinst, NULL, params);
                         JL_GC_PROMISE_ROOTED(codeinst->def); // analyzer seems confused
-                        record_method_roots(method_roots, codeinst->def);
+                        record_method_roots(method_roots, jl_get_ci_mi(codeinst));
                         if (result_m)
                             compiled_functions[codeinst] = {std::move(result_m), std::move(decls)};
                         else if (jl_options.trim != JL_TRIM_NO) {
@@ -2267,7 +2267,7 @@ void jl_get_llvmf_defn_impl(jl_llvmf_dump_t* dump, jl_method_instance_t *mi, jl_
         // To get correct names in the IR this needs to be at least 2
         output.temporary_roots = jl_alloc_array_1d(jl_array_any_type, 0);
         JL_GC_PUSH1(&output.temporary_roots);
-        auto decls = jl_emit_code(m, mi, src, output);
+        auto decls = jl_emit_code(m, mi, src, NULL, output);
         output.temporary_roots = nullptr;
         JL_GC_POP(); // GC the global_targets array contents now since reflection doesn't need it
 

src/builtins.c

@@ -1589,11 +1589,19 @@ JL_CALLABLE(jl_f_invoke)
         return jl_gf_invoke_by_method(m, args[0], &args[2], nargs - 1);
     } else if (jl_is_code_instance(argtypes)) {
         jl_code_instance_t *codeinst = (jl_code_instance_t*)args[1];
+        jl_method_instance_t *mi = jl_get_ci_mi(codeinst);
         jl_callptr_t invoke = jl_atomic_load_acquire(&codeinst->invoke);
         // N.B.: specTypes need not be a subtype of the method signature. We need to check both.
-        if (!jl_tuple1_isa(args[0], &args[2], nargs - 1, (jl_datatype_t*)codeinst->def->specTypes) ||
-            (jl_is_method(codeinst->def->def.value) && !jl_tuple1_isa(args[0], &args[2], nargs - 1, (jl_datatype_t*)codeinst->def->def.method->sig))) {
-            jl_type_error("invoke: argument type error", codeinst->def->specTypes, arg_tuple(args[0], &args[2], nargs - 1));
+        if (jl_is_abioverride(codeinst->def)) {
+            jl_datatype_t *abi = (jl_datatype_t*)((jl_abi_override_t*)(codeinst->def))->abi;
+            if (!jl_tuple1_isa(args[0], &args[2], nargs - 1, abi)) {
+                jl_type_error("invoke: argument type error (ABI overwrite)", (jl_value_t*)abi, arg_tuple(args[0], &args[2], nargs - 1));
+            }
+        } else {
+            if (!jl_tuple1_isa(args[0], &args[2], nargs - 1, (jl_datatype_t*)mi->specTypes) ||
+                (jl_is_method(mi->def.value) && !jl_tuple1_isa(args[0], &args[2], nargs - 1, (jl_datatype_t*)mi->def.method->sig))) {
+                jl_type_error("invoke: argument type error", mi->specTypes, arg_tuple(args[0], &args[2], nargs - 1));
+            }
         }
         if (jl_atomic_load_relaxed(&codeinst->min_world) > jl_current_task->world_age ||
             jl_current_task->world_age > jl_atomic_load_relaxed(&codeinst->max_world)) {
@@ -1609,7 +1617,7 @@ JL_CALLABLE(jl_f_invoke)
             if (codeinst->owner != jl_nothing) {
                 jl_error("Failed to invoke or compile external codeinst");
             }
-            return jl_invoke(args[0], &args[2], nargs - 1, codeinst->def);
+            return jl_invoke(args[0], &args[2], nargs - 1, mi);
         }
     }
     if (!jl_is_tuple_type(jl_unwrap_unionall(argtypes)))

src/clangsa/GCChecker.cpp

@@ -847,6 +847,7 @@ bool GCChecker::isGCTrackedType(QualType QT) {
                    Name.ends_with_insensitive("jl_vararg_t") ||
                    Name.ends_with_insensitive("jl_opaque_closure_t") ||
                    Name.ends_with_insensitive("jl_globalref_t") ||
+                   Name.ends_with_insensitive("jl_abi_override_t") ||
                    // Probably not technically true for these, but let's allow it as a root
                    Name.ends_with_insensitive("jl_ircode_state") ||
                    Name.ends_with_insensitive("typemap_intersection_env") ||