Implement function prefix data as an IR feature.

Previous discussion:
http://lists.cs.uiuc.edu/pipermail/llvmdev/2013-July/063909.html

Differential Revision: http://llvm-reviews.chandlerc.com/D1191

llvm-svn: 190773

3 files changed, 8 insertions, 2 deletions

diff --git a/llvm/lib/AsmParser/LLLexer.cpp b/llvm/lib/AsmParser/LLLexer.cpp
index de29c8d9a25..99bff45792c 100644
--- a/llvm/lib/AsmParser/LLLexer.cpp
+++ b/llvm/lib/AsmParser/LLLexer.cpp
@@ -540,6 +540,7 @@ lltok::Kind LLLexer::LexIdentifier() {
   KEYWORD(alignstack);
   KEYWORD(inteldialect);
   KEYWORD(gc);
+  KEYWORD(prefix);
 
   KEYWORD(ccc);
   KEYWORD(fastcc);
diff --git a/llvm/lib/AsmParser/LLParser.cpp b/llvm/lib/AsmParser/LLParser.cpp
index 8fa010441a6..336518c4017 100644
--- a/llvm/lib/AsmParser/LLParser.cpp
+++ b/llvm/lib/AsmParser/LLParser.cpp
@@ -2922,7 +2922,7 @@ bool LLParser::ParseTypeAndBasicBlock(BasicBlock *&BB, LocTy &Loc,
 /// FunctionHeader
 ///   ::= OptionalLinkage OptionalVisibility OptionalCallingConv OptRetAttrs
 ///       OptUnnamedAddr Type GlobalName '(' ArgList ')' OptFuncAttrs OptSection
-///       OptionalAlign OptGC
+///       OptionalAlign OptGC OptionalPrefix
 bool LLParser::ParseFunctionHeader(Function *&Fn, bool isDefine) {
   // Parse the linkage.
   LocTy LinkageLoc = Lex.getLoc();
@@ -3001,6 +3001,7 @@ bool LLParser::ParseFunctionHeader(Function *&Fn, bool isDefine) {
   std::string GC;
   bool UnnamedAddr;
   LocTy UnnamedAddrLoc;
+  Constant *Prefix = 0;
 
   if (ParseArgumentList(ArgList, isVarArg) ||
       ParseOptionalToken(lltok::kw_unnamed_addr, UnnamedAddr,
@@ -3011,7 +3012,9 @@ bool LLParser::ParseFunctionHeader(Function *&Fn, bool isDefine) {
        ParseStringConstant(Section)) ||
       ParseOptionalAlignment(Alignment) ||
       (EatIfPresent(lltok::kw_gc) &&
-       ParseStringConstant(GC)))
+       ParseStringConstant(GC)) ||
+      (EatIfPresent(lltok::kw_prefix) &&
+       ParseGlobalTypeAndValue(Prefix)))
     return true;
 
   if (FuncAttrs.contains(Attribute::Builtin))
@@ -3109,6 +3112,7 @@ bool LLParser::ParseFunctionHeader(Function *&Fn, bool isDefine) {
   Fn->setAlignment(Alignment);
   Fn->setSection(Section);
   if (!GC.empty()) Fn->setGC(GC.c_str());
+  Fn->setPrefixData(Prefix);
   ForwardRefAttrGroups[Fn] = FwdRefAttrGrps;
 
   // Add all of the arguments we parsed to the function.
diff --git a/llvm/lib/AsmParser/LLToken.h b/llvm/lib/AsmParser/LLToken.h
index 9a6799d7d2c..e1382fdb597 100644
--- a/llvm/lib/AsmParser/LLToken.h
+++ b/llvm/lib/AsmParser/LLToken.h
@@ -81,6 +81,7 @@ namespace lltok {
     kw_alignstack,
     kw_inteldialect,
     kw_gc,
+    kw_prefix,
     kw_c,
 
     kw_cc, kw_ccc, kw_fastcc, kw_coldcc,