codegen.c (mrb_last_insn): no previous instruction on top.

f85c5054 · Yukihiro "Matz" Matsumoto · 938af8a8 · f85c5054
Unverified Commit f85c5054 authored Sep 20, 2021 by Yukihiro "Matz" Matsumoto
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mrbgems/mruby-compiler/core/codegen.c mrbgems/mruby-compiler/core/codegen.c +4 -0

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--- a/mrbgems/mruby-compiler/core/codegen.c
+++ b/mrbgems/mruby-compiler/core/codegen.c
@@ -467,6 +467,10 @@ mrb_prev_pc(codegen_scope *s, const mrb_code *pc)
 static struct mrb_insn_data
 mrb_last_insn(codegen_scope *s)
 {
+  if (s->pc == 0) {
+    struct mrb_insn_data data = { OP_NOP, 0 };
+    return data;
+  }
  return mrb_decode_insn(&s->iseq[s->lastpc]);
 }