From 732cf2d598b4c9ca47e9c32fbd2e7732d971bda6 Mon Sep 17 00:00:00 2001
From: Rafael Espindola <rafael.espindola@gmail.com>
Date: Thu, 14 Nov 2013 06:05:49 +0000
Subject: [PATCH] Don't mangle \n and "

There is nothing special about quotes and newlines from the object
file point of view, only the assembler has to worry about expanding
the \n and \".

This patch then removes the special handling from the Mangler.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@194667 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/MC/MCSymbol.cpp                   | 17 ++++++++++---
 lib/Target/Mangler.cpp                | 36 +--------------------------
 test/CodeGen/X86/newline-and-quote.ll |  6 +++++
 3 files changed, 21 insertions(+), 38 deletions(-)
 create mode 100644 test/CodeGen/X86/newline-and-quote.ll

diff --git a/lib/MC/MCSymbol.cpp b/lib/MC/MCSymbol.cpp
index b973c57f7b8..24165254e56 100644
--- a/lib/MC/MCSymbol.cpp
+++ b/lib/MC/MCSymbol.cpp
@@ -68,12 +68,23 @@ void MCSymbol::print(raw_ostream &OS) const {
   // The name for this MCSymbol is required to be a valid target name.  However,
   // some targets support quoting names with funny characters.  If the name
   // contains a funny character, then print it quoted.
-  if (!NameNeedsQuoting(getName())) {
-    OS << getName();
+  StringRef Name = getName();
+  if (!NameNeedsQuoting(Name)) {
+    OS << Name;
     return;
   }
 
-  OS << '"' << getName() << '"';
+  OS << '"';
+  for (unsigned I = 0, E = Name.size(); I != E; ++I) {
+    char C = Name[I];
+    if (C == '\n')
+      OS << "\\n";
+    else if (C == '"')
+      OS << "\\\"";
+    else
+      OS << C;
+  }
+  OS << '"';
 }
 
 #if !defined(NDEBUG) || defined(LLVM_ENABLE_DUMP)
diff --git a/lib/Target/Mangler.cpp b/lib/Target/Mangler.cpp
index 0fc1f2356f8..38be25c330a 100644
--- a/lib/Target/Mangler.cpp
+++ b/lib/Target/Mangler.cpp
@@ -23,31 +23,6 @@
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;
 
-static char HexDigit(int V) {
-  return V < 10 ? V+'0' : V+'A'-10;
-}
-
-static void MangleLetter(SmallVectorImpl<char> &OutName, unsigned char C) {
-  OutName.push_back('_');
-  OutName.push_back(HexDigit(C >> 4));
-  OutName.push_back(HexDigit(C & 15));
-  OutName.push_back('_');
-}
-
-/// appendMangledQuotedName - On systems that support quoted symbols, we still
-/// have to escape some (obscure) characters like " and \n which would break the
-/// assembler's lexing.
-static void appendMangledQuotedName(SmallVectorImpl<char> &OutName,
-                                   StringRef Str) {
-  for (unsigned i = 0, e = Str.size(); i != e; ++i) {
-    if (Str[i] == '"' || Str[i] == '\n')
-      MangleLetter(OutName, Str[i]);
-    else
-      OutName.push_back(Str[i]);
-  }
-}
-
-
 /// getNameWithPrefix - Fill OutName with the name of the appropriate prefix
 /// and the specified name as the global variable name.  GVName must not be
 /// empty.
@@ -85,16 +60,7 @@ void Mangler::getNameWithPrefix(SmallVectorImpl<char> &OutName,
   }
 
   // If this is a simple string that doesn't need escaping, just append it.
-  // Quotes can be used unless the string contains a quote or newline.
-  if (Name.find_first_of("\n\"") == StringRef::npos) {
-    OutName.append(Name.begin(), Name.end());
-    return;
-  }
-
-  // Okay, the system allows quoted strings.  We can quote most anything, the
-  // only characters that need escaping are " and \n.
-  assert(Name.find_first_of("\n\"") != StringRef::npos);
-  return appendMangledQuotedName(OutName, Name);
+  OutName.append(Name.begin(), Name.end());
 }
 
 /// AddFastCallStdCallSuffix - Microsoft fastcall and stdcall functions require
diff --git a/test/CodeGen/X86/newline-and-quote.ll b/test/CodeGen/X86/newline-and-quote.ll
new file mode 100644
index 00000000000..9206e9f398e
--- /dev/null
+++ b/test/CodeGen/X86/newline-and-quote.ll
@@ -0,0 +1,6 @@
+; RUN: llc < %s -mtriple=x86_64-pc-linux-gnu | FileCheck %s
+@"foo\22bar" = global i32 42
+; CHECK: .globl "foo\"bar"
+
+@"foo\0abar" = global i32 42
+; CHECK: .globl "foo\nbar"
-- 
2.34.1