kotovalexarian-likes-github/ruby--ruby
1
0
Fork 0
mirror of https://github.com/ruby/ruby.git synced 2022-11-09 12:17:21 -05:00
Code Releases Activity

Correct margin for stack overflow test

Browse source 
In vm_push_frame(), the stack overflow test is done against a
decremented cfp. YJIT wasn't accounting for that in its stack overflow
tests.
This commit is contained in:
Alan Wu 2021-09-20 17:35:34 -04:00
parent 7482744e04
commit 6ef1609fab
1 changed files with 3 additions and 2 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
yjit_codegen.c
View file

@ -3132,7 +3132,7 @@ gen_send_cfunc(jitstate_t *jit, ctx_t *ctx, const struct rb_callinfo *ci, const
// Stack overflow check
// #define CHECK_VM_STACK_OVERFLOW0(cfp, sp, margin)
// REG_CFP <= REG_SP + 4 * sizeof(VALUE) + sizeof(rb_control_frame_t)
lea(cb, REG0, ctx_sp_opnd(ctx, sizeof(VALUE) * 4 + sizeof(rb_control_frame_t)));
lea(cb, REG0, ctx_sp_opnd(ctx, sizeof(VALUE) * 4 + 2 * sizeof(rb_control_frame_t)));
cmp(cb, REG_CFP, REG0);
jle_ptr(cb, COUNTED_EXIT(side_exit, send_se_cf_overflow));
@ -3428,9 +3428,10 @@ gen_send_iseq(jitstate_t *jit, ctx_t *ctx, const struct rb_callinfo *ci, const r
}
// Stack overflow check
// Note that vm_push_frame checks it against a decremented cfp, hence the multiply by 2.
// #define CHECK_VM_STACK_OVERFLOW0(cfp, sp, margin)
ADD_COMMENT(cb, "stack overflow check");
lea(cb, REG0, ctx_sp_opnd(ctx, sizeof(VALUE) * (num_locals + iseq->body->stack_max) + sizeof(rb_control_frame_t)));
lea(cb, REG0, ctx_sp_opnd(ctx, sizeof(VALUE) * (num_locals + iseq->body->stack_max) + 2 * sizeof(rb_control_frame_t)));
cmp(cb, REG_CFP, REG0);
jle_ptr(cb, COUNTED_EXIT(side_exit, send_se_cf_overflow));