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Add fixes for feedback

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Aaron Patterson 2021-09-08 10:14:54 -07:00 committed by Alan Wu
parent f30f299060
commit f380856923
1 changed files with 2 additions and 108 deletions
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108
yjit_codegen.c
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@ -1544,7 +1544,7 @@ gen_set_ivar(jitstate_t *jit, ctx_t *ctx, const int max_chain_depth, VALUE compt
x86opnd_t tbl_opnd = mem_opnd(64, REG0, offsetof(struct RObject, as.heap.ivptr));
mov(cb, REG0, tbl_opnd);
// Read the ivar from the extended table
// Write ivar to the extended table
x86opnd_t ivar_opnd = mem_opnd(64, REG0, sizeof(VALUE) * ivar_index);
mov(cb, REG1, ctx_stack_pop(ctx, 1));
mov(cb, ivar_opnd, REG1);
@ -1571,112 +1571,6 @@ gen_set_ivar(jitstate_t *jit, ctx_t *ctx, const int max_chain_depth, VALUE compt
return YJIT_CANT_COMPILE;
}
/*
{
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;
}
*/
// Codegen for getting an instance variable.
// Preconditions:
// - receiver is in REG0