Remove arraylist_t from external native code APIs. (#56693)

This makes them usable for external consumers like GPUCompiler.jl.

src/aotcompile.cpp

@@ -95,33 +95,55 @@ void jl_get_function_id_impl(void *native_code, jl_code_instance_t *codeinst,
     }
 }
 
-extern "C" JL_DLLEXPORT_CODEGEN
-void jl_get_llvm_mis_impl(void *native_code, arraylist_t* MIs)
+extern "C" JL_DLLEXPORT_CODEGEN void
+jl_get_llvm_mis_impl(void *native_code, size_t *num_elements, jl_method_instance_t **data)
 {
-    jl_native_code_desc_t *data = (jl_native_code_desc_t*)native_code;
-    auto map = data->jl_fvar_map;
+    jl_native_code_desc_t *desc = (jl_native_code_desc_t *)native_code;
+    auto &map = desc->jl_fvar_map;
+
+    if (data == NULL) {
+        *num_elements = map.size();
+        return;
+    }
+
+    assert(*num_elements == map.size());
+    size_t i = 0;
     for (auto &ci : map) {
-        jl_method_instance_t *mi = ci.first->def;
-        arraylist_push(MIs, mi);
+        data[i++] = ci.first->def;
     }
 }
 
-extern "C" JL_DLLEXPORT_CODEGEN
-void jl_get_llvm_gvs_impl(void *native_code, arraylist_t *gvs)
+extern "C" JL_DLLEXPORT_CODEGEN void jl_get_llvm_gvs_impl(void *native_code,
+                                                          size_t *num_elements, void **data)
 {
     // map a memory location (jl_value_t or jl_binding_t) to a GlobalVariable
-    jl_native_code_desc_t *data = (jl_native_code_desc_t*)native_code;
-    arraylist_grow(gvs, data->jl_value_to_llvm.size());
-    memcpy(gvs->items, data->jl_value_to_llvm.data(), gvs->len * sizeof(void*));
+    jl_native_code_desc_t *desc = (jl_native_code_desc_t *)native_code;
+    auto &value_map = desc->jl_value_to_llvm;
+
+    if (data == NULL) {
+        *num_elements = value_map.size();
+        return;
+    }
+
+    assert(*num_elements == value_map.size());
+    memcpy(data, value_map.data(), *num_elements * sizeof(void *));
 }
 
-extern "C" JL_DLLEXPORT_CODEGEN
-void jl_get_llvm_external_fns_impl(void *native_code, arraylist_t *external_fns)
+extern "C" JL_DLLEXPORT_CODEGEN void jl_get_llvm_external_fns_impl(void *native_code,
+                                                                   size_t *num_elements,
+                                                                   jl_code_instance_t *data)
 {
-    jl_native_code_desc_t *data = (jl_native_code_desc_t*)native_code;
-    arraylist_grow(external_fns, data->jl_external_to_llvm.size());
-    memcpy(external_fns->items, data->jl_external_to_llvm.data(),
-        external_fns->len * sizeof(jl_code_instance_t*));
+    jl_native_code_desc_t *desc = (jl_native_code_desc_t *)native_code;
+    auto &external_map = desc->jl_external_to_llvm;
+
+    if (data == NULL) {
+        *num_elements = external_map.size();
+        return;
+    }
+
+    assert(*num_elements == external_map.size());
+    memcpy((void *)data, (const void *)external_map.data(),
+           *num_elements * sizeof(jl_code_instance_t *));
 }
 
 extern "C" JL_DLLEXPORT_CODEGEN

src/julia_internal.h

@@ -1951,13 +1951,15 @@ JL_DLLIMPORT void *jl_create_native(jl_array_t *methods, LLVMOrcThreadSafeModule
 JL_DLLIMPORT void jl_dump_native(void *native_code,
         const char *bc_fname, const char *unopt_bc_fname, const char *obj_fname, const char *asm_fname,
         ios_t *z, ios_t *s, jl_emission_params_t *params);
-JL_DLLIMPORT void jl_get_llvm_gvs(void *native_code, arraylist_t *gvs);
-JL_DLLIMPORT void jl_get_llvm_external_fns(void *native_code, arraylist_t *gvs);
+JL_DLLIMPORT void jl_get_llvm_gvs(void *native_code, size_t *num_els, void **gvs);
+JL_DLLIMPORT void jl_get_llvm_external_fns(void *native_code, size_t *num_els,
+                                           jl_code_instance_t *gvs);
 JL_DLLIMPORT void jl_get_function_id(void *native_code, jl_code_instance_t *ncode,
         int32_t *func_idx, int32_t *specfunc_idx);
 JL_DLLIMPORT void jl_register_fptrs(uint64_t image_base, const struct _jl_image_fptrs_t *fptrs,
                                     jl_method_instance_t **linfos, size_t n);
-JL_DLLIMPORT void jl_get_llvm_mis(void *native_code, arraylist_t* MIs);
+JL_DLLIMPORT void jl_get_llvm_mis(void *native_code, size_t *num_els,
+                                  jl_method_instance_t *MIs);
 JL_DLLIMPORT void jl_init_codegen(void);
 JL_DLLIMPORT void jl_teardown_codegen(void) JL_NOTSAFEPOINT;
 JL_DLLIMPORT int jl_getFunctionInfo(jl_frame_t **frames, uintptr_t pointer, int skipC, int noInline) JL_NOTSAFEPOINT;

src/staticdata.c

@@ -2897,10 +2897,20 @@ static void jl_save_system_image_to_stream(ios_t *f, jl_array_t *mod_array,
 
     int en = jl_gc_enable(0);
     if (native_functions) {
-        jl_get_llvm_gvs(native_functions, &gvars);
-        jl_get_llvm_external_fns(native_functions, &external_fns);
-        if (jl_options.trim)
-            jl_get_llvm_mis(native_functions, &MIs);
+        size_t num_gvars, num_external_fns;
+        jl_get_llvm_gvs(native_functions, &num_gvars, NULL);
+        arraylist_grow(&gvars, num_gvars);
+        jl_get_llvm_gvs(native_functions, &num_gvars, gvars.items);
+        jl_get_llvm_external_fns(native_functions, &num_external_fns, NULL);
+        arraylist_grow(&external_fns, num_external_fns);
+        jl_get_llvm_external_fns(native_functions, &num_external_fns,
+                                 (jl_code_instance_t *)external_fns.items);
+        if (jl_options.trim) {
+            size_t num_mis;
+            jl_get_llvm_mis(native_functions, &num_mis, NULL);
+            arraylist_grow(&MIs, num_mis);
+            jl_get_llvm_mis(native_functions, &num_mis, (jl_method_instance_t *)MIs.items);
+        }
     }
     if (jl_options.trim) {
         jl_rebuild_methtables(&MIs, &new_methtables);