From d7392bd3aec5ca3d017745f1a47b38df9ddaf968 Mon Sep 17 00:00:00 2001
From: Patrick Walton <pcwalton@mimiga.net>
Date: Fri, 20 Dec 2013 20:33:22 -0800
Subject: [PATCH] librustc: De-`@mut` `FunctionContext::llenv`

---
 src/librustc/middle/trans/base.rs    | 10 +++++-----
 src/librustc/middle/trans/closure.rs |  2 +-
 src/librustc/middle/trans/common.rs  |  2 +-
 3 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/src/librustc/middle/trans/base.rs b/src/librustc/middle/trans/base.rs
index e4dc991938b7..9a9bb9197cfe 100644
--- a/src/librustc/middle/trans/base.rs
+++ b/src/librustc/middle/trans/base.rs
@@ -69,7 +69,7 @@ use util::sha2::Sha256;
 use middle::trans::type_::Type;
 
 use std::c_str::ToCStr;
-use std::cell::RefCell;
+use std::cell::{Cell, RefCell};
 use std::hashmap::HashMap;
 use std::libc::c_uint;
 use std::vec;
@@ -1683,7 +1683,7 @@ pub fn new_fn_ctxt_w_id(ccx: @CrateContext,
     let fcx = @mut FunctionContext {
           llfn: llfndecl,
           llenv: unsafe {
-              llvm::LLVMGetUndef(Type::i8p().to_ref())
+              Cell::new(llvm::LLVMGetUndef(Type::i8p().to_ref()))
           },
           llretptr: None,
           entry_bcx: None,
@@ -1702,9 +1702,9 @@ pub fn new_fn_ctxt_w_id(ccx: @CrateContext,
           ccx: ccx,
           debug_context: debug_context,
     };
-    fcx.llenv = unsafe {
+    fcx.llenv.set(unsafe {
           llvm::LLVMGetParam(llfndecl, fcx.env_arg_pos() as c_uint)
-    };
+    });
 
     unsafe {
         let entry_bcx = top_scope_block(fcx, opt_node_info);
@@ -1759,7 +1759,7 @@ pub fn create_llargs_for_fn_args(cx: @mut FunctionContext,
     match self_arg {
       impl_self(tt, self_mode) => {
         cx.llself = Some(ValSelfData {
-            v: cx.llenv,
+            v: cx.llenv.get(),
             t: tt,
             is_copy: self_mode == ty::ByCopy
         });
diff --git a/src/librustc/middle/trans/closure.rs b/src/librustc/middle/trans/closure.rs
index 2fc821f53269..668864262800 100644
--- a/src/librustc/middle/trans/closure.rs
+++ b/src/librustc/middle/trans/closure.rs
@@ -307,7 +307,7 @@ pub fn load_environment(fcx: @mut FunctionContext,
     let bcx = fcx.entry_bcx.unwrap();
 
     // Load a pointer to the closure data, skipping over the box header:
-    let llcdata = opaque_box_body(bcx, cdata_ty, fcx.llenv);
+    let llcdata = opaque_box_body(bcx, cdata_ty, fcx.llenv.get());
 
     // Store the pointer to closure data in an alloca for debug info because that's what the
     // llvm.dbg.declare intrinsic expects
diff --git a/src/librustc/middle/trans/common.rs b/src/librustc/middle/trans/common.rs
index bc5c9f8500f7..7766e0420538 100644
--- a/src/librustc/middle/trans/common.rs
+++ b/src/librustc/middle/trans/common.rs
@@ -206,7 +206,7 @@ pub struct FunctionContext {
 
     // The implicit environment argument that arrives in the function we're
     // creating.
-    llenv: ValueRef,
+    llenv: Cell<ValueRef>,
 
     // The place to store the return value. If the return type is immediate,
     // this is an alloca in the function. Otherwise, it's the hidden first