From 48ee81c6798a415bc592255f385bdb8427b9ebcf Mon Sep 17 00:00:00 2001
From: Saleem Abdulrasool <compnerd@compnerd.org>
Date: Sat, 5 Apr 2014 20:51:58 +0000
Subject: [PATCH] AsmParser: restore LLVM IR compatibility for
 linker_private{,_weak}

This restores the linker_private and linker_private_weak lexemes to permit
translation of the deprecated lexmes.  The behaviour is identical to the bitcode
handling: linker_private and linker_private_weak are handled as if private had
been specified.  This enables compatibility with IR generated by LLVM 3.4.

Reported on IRC by ki9a!

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@205675 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/AsmParser/LLLexer.cpp                           |  2 ++
 lib/AsmParser/LLParser.cpp                          | 13 +++++++++++++
 lib/AsmParser/LLToken.h                             |  2 ++
 ...deprecated-linker_private-linker_private_weak.ll |  8 ++++++++
 4 files changed, 25 insertions(+)
 create mode 100644 test/Bitcode/deprecated-linker_private-linker_private_weak.ll

diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index 1a5eec3db7d..4fec7e60fa6 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -481,6 +481,8 @@ lltok::Kind LLLexer::LexIdentifier() {
 
   KEYWORD(private);
   KEYWORD(internal);
+  KEYWORD(linker_private);        // NOTE: deprecated, for parser compatibility
+  KEYWORD(linker_private_weak);   // NOTE: deprecated, for parser compatibility
   KEYWORD(available_externally);
   KEYWORD(linkonce);
   KEYWORD(linkonce_odr);
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index 37151e68cb2..b53b4ce7c0e 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -247,6 +247,8 @@ bool LLParser::ParseTopLevelEntities() {
     //               ('constant'|'global') ...
     case lltok::kw_private:             // OptionalLinkage
     case lltok::kw_internal:            // OptionalLinkage
+    case lltok::kw_linker_private:      // Obsolete OptionalLinkage
+    case lltok::kw_linker_private_weak: // Obsolete OptionalLinkage
     case lltok::kw_weak:                // OptionalLinkage
     case lltok::kw_weak_odr:            // OptionalLinkage
     case lltok::kw_linkonce:            // OptionalLinkage
@@ -1286,6 +1288,10 @@ bool LLParser::ParseOptionalReturnAttrs(AttrBuilder &B) {
 ///   ::= 'common'
 ///   ::= 'extern_weak'
 ///   ::= 'external'
+///
+///   Deprecated Values:
+///     ::= 'linker_private'
+///     ::= 'linker_private_weak'
 bool LLParser::ParseOptionalLinkage(unsigned &Res, bool &HasLinkage) {
   HasLinkage = false;
   switch (Lex.getKind()) {
@@ -1303,6 +1309,13 @@ bool LLParser::ParseOptionalLinkage(unsigned &Res, bool &HasLinkage) {
   case lltok::kw_common:         Res = GlobalValue::CommonLinkage;        break;
   case lltok::kw_extern_weak:    Res = GlobalValue::ExternalWeakLinkage;  break;
   case lltok::kw_external:       Res = GlobalValue::ExternalLinkage;      break;
+
+  case lltok::kw_linker_private:
+  case lltok::kw_linker_private_weak:
+    Lex.Lex();
+    // treat linker_private and linker_private_weak as PrivateLinkage
+    Res = GlobalValue::PrivateLinkage;
+    return false;
   }
   Lex.Lex();
   HasLinkage = true;
diff --git a/lib/AsmParser/LLToken.h b/lib/AsmParser/LLToken.h
index 532e896b182..00f7fe8c120 100644
--- a/lib/AsmParser/LLToken.h
+++ b/lib/AsmParser/LLToken.h
@@ -39,6 +39,8 @@ namespace lltok {
 
     kw_private,
     kw_internal,
+    kw_linker_private,          // NOTE: deprecated, for parser compatibility
+    kw_linker_private_weak,     // NOTE: deprecated, for parser compatibility
     kw_linkonce, kw_linkonce_odr,
     kw_weak, kw_weak_odr, kw_appending,
     kw_dllimport, kw_dllexport, kw_common, kw_available_externally,
diff --git a/test/Bitcode/deprecated-linker_private-linker_private_weak.ll b/test/Bitcode/deprecated-linker_private-linker_private_weak.ll
new file mode 100644
index 00000000000..538f6419a14
--- /dev/null
+++ b/test/Bitcode/deprecated-linker_private-linker_private_weak.ll
@@ -0,0 +1,8 @@
+; RUN: llvm-as -o - %s | llvm-dis | FileCheck %s
+
+@.linker_private = linker_private unnamed_addr constant [15 x i8] c"linker_private\00", align 64
+@.linker_private_weak = linker_private_weak unnamed_addr constant [20 x i8] c"linker_private_weak\00", align 64
+
+; CHECK: @.linker_private = private unnamed_addr constant [15 x i8] c"linker_private\00", align 64
+; CHECK: @.linker_private_weak = private unnamed_addr constant [20 x i8] c"linker_private_weak\00", align 64
+