From b66e58d6c9cb1684bac548406f6a950bf0eb65e3 Mon Sep 17 00:00:00 2001
From: Christian <c@ethdev.com>
Date: Thu, 6 Nov 2014 16:43:20 +0100
Subject: [PATCH] Prevent optimizer from changing certain parts of the code.

---
 Compiler.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/Compiler.cpp b/Compiler.cpp
index 571a62d72..93cb172d8 100644
--- a/Compiler.cpp
+++ b/Compiler.cpp
@@ -89,10 +89,11 @@ void Compiler::appendFunctionSelector(vector<ASTPointer<FunctionDefinition>> con
 	eth::AssemblyItem jumpTableStart = m_context.pushNewTag();
 	m_context << eth::Instruction::ADD << eth::Instruction::JUMP;
 
-	// jump table @todo it could be that the optimizer destroys this
-	m_context << jumpTableStart;
+	// jump table, tell the optimizer not to remove the JUMPDESTs
+	m_context << eth::AssemblyItem(eth::NoOptimizeBegin) << jumpTableStart;
 	for (pair<string, pair<FunctionDefinition const*, eth::AssemblyItem>> const& f: publicFunctions)
 		m_context.appendJumpTo(f.second.second) << eth::Instruction::JUMPDEST;
+	m_context << eth::AssemblyItem(eth::NoOptimizeEnd);
 
 	m_context << returnTag << eth::Instruction::STOP;