From 4d226e8f17d2b0eb424486b965f95e42a89389b9 Mon Sep 17 00:00:00 2001
From: bjorn3 <bjorn3@users.noreply.github.com>
Date: Fri, 13 Mar 2020 11:01:39 +0100
Subject: [PATCH] Hash trap message symbol nameThis saves ~7% of disk space

---
 src/trap.rs | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/src/trap.rs b/src/trap.rs
index 6ce5be0009f..5d306490683 100644
--- a/src/trap.rs
+++ b/src/trap.rs
@@ -1,3 +1,6 @@
+use std::collections::hash_map::DefaultHasher;
+use std::hash::{Hash, Hasher};
+
 use crate::prelude::*;
 
 fn codegen_print(fx: &mut FunctionCx<'_, '_, impl cranelift_module::Backend>, msg: &str) {
@@ -21,12 +24,15 @@ fn codegen_print(fx: &mut FunctionCx<'_, '_, impl cranelift_module::Backend>, ms
 
     let symbol_name = fx.tcx.symbol_name(fx.instance);
     let real_msg = format!("trap at {:?} ({}): {}\0", fx.instance, symbol_name, msg);
+    let mut hasher = DefaultHasher::new();
+    real_msg.hash(&mut hasher);
+    let msg_hash = hasher.finish();
     let mut data_ctx = DataContext::new();
     data_ctx.define(real_msg.as_bytes().to_vec().into_boxed_slice());
     let msg_id = fx
         .module
         .declare_data(
-            &(symbol_name.name.as_str().to_string() + msg),
+            &format!("__trap_{:08x}", msg_hash),
             Linkage::Local,
             false,
             false,