From eff2ab61b5d411fe64ba601d402b7c549644b590 Mon Sep 17 00:00:00 2001
From: Devang Patel <dpatel@apple.com>
Date: Wed, 29 Jul 2009 00:34:02 +0000
Subject: [PATCH] Parse named metadata.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@77410 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/AsmParser/LLLexer.cpp  | 18 +++++++++++++++++-
 lib/AsmParser/LLLexer.h    |  1 +
 lib/AsmParser/LLParser.cpp | 36 ++++++++++++++++++++++++++++++++++++
 lib/AsmParser/LLParser.h   |  1 +
 lib/AsmParser/LLToken.h    |  1 +
 5 files changed, 56 insertions(+), 1 deletion(-)

diff --git a/lib/AsmParser/LLLexer.cpp b/lib/AsmParser/LLLexer.cpp
index c9b28212435..4a7e1230938 100644
--- a/lib/AsmParser/LLLexer.cpp
+++ b/lib/AsmParser/LLLexer.cpp
@@ -253,7 +253,7 @@ lltok::Kind LLLexer::LexToken() {
   case ';':
     SkipLineComment();
     return LexToken();
-  case '!': return lltok::Metadata;
+  case '!': return LexMetadata();
   case '0': case '1': case '2': case '3': case '4':
   case '5': case '6': case '7': case '8': case '9':
   case '-':
@@ -421,7 +421,23 @@ static bool JustWhitespaceNewLine(const char *&Ptr) {
   return false;
 }
 
+/// LexMetadata:
+///    !{...}
+///    !42
+///    !foo
+lltok::Kind LLLexer::LexMetadata() {
+  if (isalpha(CurPtr[0])) {
+    ++CurPtr;
+    while (isalnum(CurPtr[0]) || CurPtr[0] == '-' || CurPtr[0] == '$' ||
+           CurPtr[0] == '.' || CurPtr[0] == '_')
+      ++CurPtr;
 
+    StrVal.assign(TokStart+1, CurPtr);   // Skip !
+    return lltok::NamedMD;
+  }
+  return lltok::Metadata;
+}
+  
 /// LexIdentifier: Handle several related productions:
 ///    Label           [-a-zA-Z$._0-9]+:
 ///    IntegerType     i[0-9]+
diff --git a/lib/AsmParser/LLLexer.h b/lib/AsmParser/LLLexer.h
index 4e054639414..de39272f45e 100644
--- a/lib/AsmParser/LLLexer.h
+++ b/lib/AsmParser/LLLexer.h
@@ -75,6 +75,7 @@ namespace llvm {
     lltok::Kind LexDigitOrNegative();
     lltok::Kind LexPositive();
     lltok::Kind LexAt();
+    lltok::Kind LexMetadata();
     lltok::Kind LexPercent();
     lltok::Kind LexQuote();
     lltok::Kind Lex0x();
diff --git a/lib/AsmParser/LLParser.cpp b/lib/AsmParser/LLParser.cpp
index b2d2b51b6c7..36f714b38e3 100644
--- a/lib/AsmParser/LLParser.cpp
+++ b/lib/AsmParser/LLParser.cpp
@@ -121,6 +121,7 @@ bool LLParser::ParseTopLevelEntities() {
     case lltok::LocalVar:   if (ParseNamedType()) return true; break;
     case lltok::GlobalVar:  if (ParseNamedGlobal()) return true; break;
     case lltok::Metadata:   if (ParseStandaloneMetadata()) return true; break;
+    case lltok::NamedMD:    if (ParseNamedMetadata()) return true; break;
 
     // The Global variable production with no name can have many different
     // optional leading prefixes, the production is:
@@ -409,6 +410,41 @@ bool LLParser::ParseMDNode(MetadataBase *&Node) {
   return false;
 }    
 
+///ParseNamedMetadata:
+///   !foo = !{ !1, !2 }
+bool LLParser::ParseNamedMetadata() {
+  assert(Lex.getKind() == lltok::NamedMD);
+  Lex.Lex();
+  std::string Name = Lex.getStrVal();
+
+  if (ParseToken(lltok::equal, "expected '=' here"))
+    return true;
+
+  if (Lex.getKind() != lltok::Metadata)
+    return TokError("Expected '!' here");
+  Lex.Lex();
+
+  if (Lex.getKind() != lltok::lbrace)
+    return TokError("Expected '{' here");
+  Lex.Lex();
+  SmallVector<MetadataBase *, 8> Elts;
+  do {
+    if (Lex.getKind() != lltok::Metadata)
+      return TokError("Expected '!' here");
+    Lex.Lex();
+    MetadataBase *N = 0;
+    if (ParseMDNode(N)) return true;
+    Elts.push_back(N);
+  } while (EatIfPresent(lltok::comma));
+
+  if (ParseToken(lltok::rbrace, "expected end of metadata node"))
+    return true;
+
+  NamedMDNode::Create(Name.c_str(), Name.length(),
+                      Elts.data(), Elts.size(), M);
+  return false;
+}
+
 /// ParseStandaloneMetadata:
 ///   !42 = !{...} 
 bool LLParser::ParseStandaloneMetadata() {
diff --git a/lib/AsmParser/LLParser.h b/lib/AsmParser/LLParser.h
index c77ef9d6d11..40848cfe77c 100644
--- a/lib/AsmParser/LLParser.h
+++ b/lib/AsmParser/LLParser.h
@@ -148,6 +148,7 @@ namespace llvm {
                      bool HasLinkage, unsigned Visibility);
     bool ParseAlias(const std::string &Name, LocTy Loc, unsigned Visibility);
     bool ParseStandaloneMetadata();
+    bool ParseNamedMetadata();
     bool ParseMDString(MetadataBase *&S);
     bool ParseMDNode(MetadataBase *&N);
 
diff --git a/lib/AsmParser/LLToken.h b/lib/AsmParser/LLToken.h
index 75cc1db8ad9..a49d05442bc 100644
--- a/lib/AsmParser/LLToken.h
+++ b/lib/AsmParser/LLToken.h
@@ -125,6 +125,7 @@ namespace lltok {
     GlobalVar,         // @foo @"foo"
     LocalVar,          // %foo %"foo"
     StringConstant,    // "foo"
+    NamedMD,           // !foo
 
     // Metadata valued tokens.
     Metadata,          // !"foo" !{i8 42}
-- 
2.34.1