From c76f67329dc55a406f2f2f255da9949947f72ffa Mon Sep 17 00:00:00 2001
From: amimo <61569276@qq.com>
Date: Mon, 28 Oct 2019 21:53:58 +0800
Subject: [PATCH] delete unused decrypt fucntion

---
 llvm/lib/Transforms/Obfuscation/StringEncryption.cpp | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/llvm/lib/Transforms/Obfuscation/StringEncryption.cpp b/llvm/lib/Transforms/Obfuscation/StringEncryption.cpp
index 5e483d84e..387d460fa 100644
--- a/llvm/lib/Transforms/Obfuscation/StringEncryption.cpp
+++ b/llvm/lib/Transforms/Obfuscation/StringEncryption.cpp
@@ -191,6 +191,11 @@ bool StringEncryption::runOnModule(Module &M) {
 
   // delete unused global variables
   deleteUnusedGlobalVariable();
+  for (CSPEntry *Entry: ConstantStringPool) {
+    if (Entry->DecFunc->use_empty()) {
+      Entry->DecFunc->eraseFromParent();
+    }
+  }
   return Changed;
 }