From 3c2639ad5520434a37488cedf3917630e7266964 Mon Sep 17 00:00:00 2001
From: Ayke van Laethem <aykevanlaethem@gmail.com>
Date: Fri, 3 May 2019 22:09:22 +0200
Subject: [PATCH] compiler: insert nil checks when storing to a pointer

This does increase code size, but it is necessary to avoid undefined
behavior.
---
 compiler/compiler.go | 1 +
 1 file changed, 1 insertion(+)

diff --git a/compiler/compiler.go b/compiler/compiler.go
index 48a03550..db5d442c 100644
--- a/compiler/compiler.go
+++ b/compiler/compiler.go
@@ -1054,6 +1054,7 @@ func (c *Compiler) parseInstr(frame *Frame, instr ssa.Instruction) {
 	case *ssa.Store:
 		llvmAddr := c.getValue(frame, instr.Addr)
 		llvmVal := c.getValue(frame, instr.Val)
+		c.emitNilCheck(frame, llvmAddr, "store")
 		if c.targetData.TypeAllocSize(llvmVal.Type()) == 0 {
 			// nothing to store
 			return