aarch64/inst/unwind.rs: handle zero-length prologues correctly.

2020-11-12 17:01:30 +01:00
parent 19640367db
commit cbce34af0a
1 changed files with 6 additions and 1 deletions
--- a/cranelift/codegen/src/isa/aarch64/inst/unwind.rs
+++ b/cranelift/codegen/src/isa/aarch64/inst/unwind.rs
@@ -102,7 +102,12 @@ impl UnwindInfoGenerator<Inst> for AArch64UnwindInfo {

        // TODO epilogues

-        let prologue_size = context.insts_layout[context.prologue.end as usize - 1];
+        let prologue_size = if context.prologue.is_empty() {
+            0
+        } else {
+            context.insts_layout[context.prologue.end as usize - 1]
+        };
+
        Ok(Some(UnwindInfo {
            prologue_size,
            prologue_unwind_codes: codes,