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codegen.c: add a comment that notice rewind_pc calling convention.

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`rewind_pc` should not be called when `s->pc` is `0` (top).
This commit is contained in:
Yukihiro "Matz" Matsumoto
2021-08-13 10:11:36 +09:00
parent 9c3d305530
commit 7907c184be
1 changed files with 2 additions and 2 deletions
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mrbgems/mruby-compiler/core/codegen.c
+2 -2
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@@ -463,8 +463,8 @@ mrb_prev_pc(codegen_scope *s, const mrb_code *pc)
static void
rewind_pc(codegen_scope *s)
{
const mrb_code *pc = mrb_prev_pc(s, pc_addr(s));
s->pc = addr_pc(s, pc);
/* should not be called when s->pc is 0 (top) */
s->pc = addr_pc(s, mrb_prev_pc(s, pc_addr(s)));
}
static struct mrb_insn_data