- // Read the ivar from the extended table

- ctx_stack_pop(ctx, 1);

-/*

-{

- VALUE comptime_val_klass = CLASS_OF(comptime_receiver);

- const ctx_t starting_context = *ctx; // make a copy for use with jit_chain_guard

-

- // If the class uses the default allocator, instances should all be T_OBJECT

- // NOTE: This assumes nobody changes the allocator of the class after allocation.

- // Eventually, we can encode whether an object is T_OBJECT or not

- // inside object shapes.

- if (rb_get_alloc_func(comptime_val_klass) != rb_class_allocate_instance) {

- GEN_COUNTER_INC(cb, setivar_not_object);

- return YJIT_CANT_COMPILE;

- }

- RUBY_ASSERT(BUILTIN_TYPE(comptime_receiver) == T_OBJECT); // because we checked the allocator

-

- // ID for the name of the ivar

- ID id = ivar_name;

- struct rb_iv_index_tbl_entry *ent;

- struct st_table *iv_index_tbl = ROBJECT_IV_INDEX_TBL(comptime_receiver);

-

- // Lookup index for the ivar the instruction loads

- if (iv_index_tbl && rb_iv_index_tbl_lookup(iv_index_tbl, id, &ent)) {

- uint32_t ivar_index = ent->index;

-

- val_type_t val_type = ctx_get_opnd_type(ctx, OPND_STACK(0));

- x86opnd_t val_to_write = ctx_stack_opnd(ctx, 0);

- mov(cb, REG1, val_to_write);

-

- // Bail if the value to write is a heap object, because this needs a write barrier

- if (!val_type.is_imm) {

- ADD_COMMENT(cb, "guard value is immediate");

- test(cb, REG1, imm_opnd(RUBY_IMMEDIATE_MASK));

- jz_ptr(cb, COUNTED_EXIT(side_exit, setivar_val_heapobject));

- ctx_upgrade_opnd_type(ctx, OPND_STACK(0), TYPE_IMM);

- }

-

- // Pop the value to write

- ctx_stack_pop(ctx, 1);

-

- // Bail if this object is frozen

- ADD_COMMENT(cb, "guard self is not frozen");

- x86opnd_t flags_opnd = member_opnd(REG0, struct RBasic, flags);

- test(cb, flags_opnd, imm_opnd(RUBY_FL_FREEZE));

- jnz_ptr(cb, COUNTED_EXIT(side_exit, setivar_frozen));

-

- // Pop receiver if it's on the temp stack

- if (!reg0_opnd.is_self) {

- (void)ctx_stack_pop(ctx, 1);

- }

-

- // Compile time self is embedded and the ivar index lands within the object

- if (RB_FL_TEST_RAW(comptime_receiver, ROBJECT_EMBED) && ivar_index < ROBJECT_EMBED_LEN_MAX) {

- // See ROBJECT_IVPTR() from include/ruby/internal/core/robject.h

-

- // Guard that self is embedded

- // TODO: BT and JC is shorter

- ADD_COMMENT(cb, "guard embedded setivar");

- test(cb, flags_opnd, imm_opnd(ROBJECT_EMBED));

- jit_chain_guard(JCC_JZ, jit, &starting_context, max_chain_depth, side_exit);

-

- // Store the ivar on the object

- x86opnd_t ivar_opnd = mem_opnd(64, REG0, offsetof(struct RObject, as.ary) + ivar_index * SIZEOF_VALUE);

- mov(cb, ivar_opnd, REG1);

-

- // Push the ivar on the stack

- // For attr_writer we'll need to push the value on the stack

- //x86opnd_t out_opnd = ctx_stack_push(ctx, TYPE_UNKNOWN);

- }

- else {

- // Compile time value is *not* embeded.

-

- // Guard that value is *not* embedded

- // See ROBJECT_IVPTR() from include/ruby/internal/core/robject.h

- ADD_COMMENT(cb, "guard extended setivar");

- x86opnd_t flags_opnd = member_opnd(REG0, struct RBasic, flags);

- test(cb, flags_opnd, imm_opnd(ROBJECT_EMBED));

- jit_chain_guard(JCC_JNZ, jit, &starting_context, max_chain_depth, side_exit);

-

- // check that the extended table is big enough

- if (ivar_index >= ROBJECT_EMBED_LEN_MAX + 1) {

- // Check that the slot is inside the extended table (num_slots > index)

- ADD_COMMENT(cb, "check index in extended table");

- x86opnd_t num_slots = mem_opnd(32, REG0, offsetof(struct RObject, as.heap.numiv));

- cmp(cb, num_slots, imm_opnd(ivar_index));

- jle_ptr(cb, COUNTED_EXIT(side_exit, setivar_idx_out_of_range));

- }

-

- // Get a pointer to the extended table

- x86opnd_t tbl_opnd = mem_opnd(64, REG0, offsetof(struct RObject, as.heap.ivptr));

- mov(cb, REG0, tbl_opnd);

-

- // Write the ivar to the extended table

- x86opnd_t ivar_opnd = mem_opnd(64, REG0, sizeof(VALUE) * ivar_index);

- mov(cb, ivar_opnd, REG1);

- }

-

- // Jump to next instruction. This allows guard chains to share the same successor.

- jit_jump_to_next_insn(jit, ctx);

- return YJIT_END_BLOCK;

- }

-

- GEN_COUNTER_INC(cb, setivar_name_not_mapped);

- return YJIT_CANT_COMPILE;

-}

-*/

-