From 7f3b28a7867a35ec56a4ed80546e64995d69483e Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Fri, 13 Mar 2009 21:33:17 +0000
Subject: [PATCH] Fix escaping in asm string literals correctly by having
 tblgen unescape them, then the asmprinter emitter reescape them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@66958 91177308-0d34-0410-b5e6-96231b3b80d8
---
 utils/TableGen/AsmWriterEmitter.cpp | 19 ++++++++++++++-----
 utils/TableGen/TGLexer.cpp          |  4 ++--
 2 files changed, 16 insertions(+), 7 deletions(-)

diff --git a/utils/TableGen/AsmWriterEmitter.cpp b/utils/TableGen/AsmWriterEmitter.cpp
index e7fe8c369bd..93ef6c86a6b 100644
--- a/utils/TableGen/AsmWriterEmitter.cpp
+++ b/utils/TableGen/AsmWriterEmitter.cpp
@@ -130,11 +130,20 @@ AsmWriterInst::AsmWriterInst(const CodeGenInstruction &CGI, unsigned Variant) {
 
     // Emit a constant string fragment.
     if (DollarPos != LastEmitted) {
-      // TODO: this should eventually handle escaping.
-      if (CurVariant == Variant || CurVariant == ~0U)
-        AddLiteralString(std::string(AsmString.begin()+LastEmitted,
-                                     AsmString.begin()+DollarPos));
-      LastEmitted = DollarPos;
+      if (CurVariant == Variant || CurVariant == ~0U) {
+        for (; LastEmitted != DollarPos; ++LastEmitted)
+          switch (AsmString[LastEmitted]) {
+          case '\n': AddLiteralString("\\n"); break;
+          case '\t': AddLiteralString("\\t"); break;
+          case '"': AddLiteralString("\\\""); break;
+          case '\\': AddLiteralString("\\\\"); break;
+          default:
+            AddLiteralString(std::string(1, AsmString[LastEmitted]));
+            break;
+          }
+      } else {
+        LastEmitted = DollarPos;
+      }
     } else if (AsmString[DollarPos] == '\\') {
       if (DollarPos+1 != AsmString.size() &&
           (CurVariant == Variant || CurVariant == ~0U)) {
diff --git a/utils/TableGen/TGLexer.cpp b/utils/TableGen/TGLexer.cpp
index 03bf0ceaa6b..79982aa05f5 100644
--- a/utils/TableGen/TGLexer.cpp
+++ b/utils/TableGen/TGLexer.cpp
@@ -174,11 +174,11 @@ tgtok::TokKind TGLexer::LexString() {
       CurStrVal += *CurPtr++;
       break;
     case 't':
-      CurStrVal += "\\t";
+      CurStrVal += '\t';
       ++CurPtr;
       break;
     case 'n':
-      CurStrVal += "\\n";
+      CurStrVal += '\n';
       ++CurPtr;
       break;