From 932abd0cb2ba2ee894901e614943d388a5d46bf9 Mon Sep 17 00:00:00 2001
From: Jur van den Berg <Jurl.berg@gmail.com>
Date: Thu, 18 Apr 2019 00:20:37 +0200
Subject: [PATCH] Fix disassembly INVOKEVIRTUAL without symbols

If there were no debug symbols, the constant pool isn't extended to hold
all methods. This caused a method name resolution to fail if main called
a method. This change takes care of this edge case and immediately
resolves to None, causing the default placeholders to be generated.
---
 src/disassembler.rs | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/src/disassembler.rs b/src/disassembler.rs
index f5cf1ce..eefeef0 100644
--- a/src/disassembler.rs
+++ b/src/disassembler.rs
@@ -54,6 +54,9 @@ impl DebugSymbols {
     }
 
     fn lookup_method_idx(&self, idx: usize) -> Option<String> {
+        if idx >= self.constants.len() {
+            return None;
+        }
         match self.methods.get(&self.constants[idx]) {
             Some(name) => Some(name.to_string()),
             None => None,