From 5ff3664fbfebff6fa2f364d3ef7aa51a931d4e31 Mon Sep 17 00:00:00 2001
From: Dan Gohman <sunfish@mozilla.com>
Date: Tue, 4 Mar 2014 14:57:57 -0800
Subject: Handle name prefixing in sanitizeGlobal/sanitizeLocal.

In the case of sanitizeGlobal, "_" was being prefixed in two different
places; this factors it out into one place.
---
 lib/Target/JSBackend/JSBackend.cpp | 14 +++++++++++---
 1 file changed, 11 insertions(+), 3 deletions(-)

diff --git a/lib/Target/JSBackend/JSBackend.cpp b/lib/Target/JSBackend/JSBackend.cpp
index f1a6aa59ee..b2ef5975cc 100644
--- a/lib/Target/JSBackend/JSBackend.cpp
+++ b/lib/Target/JSBackend/JSBackend.cpp
@@ -431,6 +431,10 @@ static inline char halfCharToHex(unsigned char half) {
 }
 
 static inline void sanitizeGlobal(std::string& str) {
+  // Global names are prefixed with "_" to prevent them from colliding with
+  // names of things in normal JS.
+  str = "_" + str;
+
   // functions and globals should already be in C-style format,
   // in addition to . for llvm intrinsics and possibly $ and so forth.
   // There is a risk of collisions here, we just lower all these
@@ -444,6 +448,10 @@ static inline void sanitizeGlobal(std::string& str) {
 }
 
 static inline void sanitizeLocal(std::string& str) {
+  // Local names are prefixed with "$" to prevent them from colliding with
+  // global names.
+  str = "$" + str;
+
   // We need to convert every string that is not a valid JS identifier into
   // a valid one, without collisions - we cannot turn "x.a" into "x_a" while
   // also leaving "x_a" as is, for example.
@@ -568,10 +576,10 @@ const std::string &JSWriter::getJSName(const Value* val) {
   std::string name;
   if (val->hasName()) {
     if (isa<Function>(val) || isa<Constant>(val)) {
-      name = std::string("_") + val->getName().str();
+      name = val->getName().str();
       sanitizeGlobal(name);
     } else {
-      name = std::string("$") + val->getName().str();
+      name = val->getName().str();
       sanitizeLocal(name);
     }
   } else {
@@ -1867,7 +1875,7 @@ void JSWriter::printFunction(const Function *F) {
 
   std::string Name = F->getName();
   sanitizeGlobal(Name);
-  Out << "function _" << Name << "(";
+  Out << "function " << Name << "(";
   for (Function::const_arg_iterator AI = F->arg_begin(), AE = F->arg_end();
        AI != AE; ++AI) {
     if (AI != F->arg_begin()) Out << ",";
-- 
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