From a27c26e7d87488c80221158dbe321fbd2df508a8 Mon Sep 17 00:00:00 2001
From: Richard Smith <richard-llvm@metafoo.co.uk>
Date: Sun, 27 Jul 2014 04:19:32 +0000
Subject: [PATCH] [modules] Add abbreviation for ImplicitCastExpr. This is the
 most common record type in LLVM's IR module.

llvm-svn: 214048
---
 clang/include/clang/Serialization/ASTWriter.h | 16 ++++++++++------
 clang/lib/Serialization/ASTWriter.cpp         |  7 ++++---
 clang/lib/Serialization/ASTWriterDecl.cpp     | 18 ++++++++++++++++++
 clang/lib/Serialization/ASTWriterStmt.cpp     |  4 ++++
 4 files changed, 36 insertions(+), 9 deletions(-)

diff --git a/clang/include/clang/Serialization/ASTWriter.h b/clang/include/clang/Serialization/ASTWriter.h
index 8ecdda4..cb7c9e5 100644
--- a/clang/include/clang/Serialization/ASTWriter.h
+++ b/clang/include/clang/Serialization/ASTWriter.h
@@ -499,10 +499,7 @@ private:
   unsigned DeclContextLexicalAbbrev;
   unsigned DeclContextVisibleLookupAbbrev;
   unsigned UpdateVisibleAbbrev;
-  unsigned DeclRefExprAbbrev;
-  unsigned CharacterLiteralAbbrev;
   unsigned DeclRecordAbbrev;
-  unsigned IntegerLiteralAbbrev;
   unsigned DeclTypedefAbbrev;
   unsigned DeclVarAbbrev;
   unsigned DeclFieldAbbrev;
@@ -510,6 +507,11 @@ private:
   unsigned DeclObjCIvarAbbrev;
   unsigned DeclCXXMethodAbbrev;
 
+  unsigned DeclRefExprAbbrev;
+  unsigned CharacterLiteralAbbrev;
+  unsigned IntegerLiteralAbbrev;
+  unsigned ExprImplicitCastAbbrev;
+
   void WriteDeclAbbrevs();
   void WriteDecl(ASTContext &Context, Decl *D);
   void AddFunctionDefinition(const FunctionDecl *FD, RecordData &Record);
@@ -745,10 +747,7 @@ public:
   }
 
   unsigned getDeclParmVarAbbrev() const { return DeclParmVarAbbrev; }
-  unsigned getDeclRefExprAbbrev() const { return DeclRefExprAbbrev; }
-  unsigned getCharacterLiteralAbbrev() const { return CharacterLiteralAbbrev; }
   unsigned getDeclRecordAbbrev() const { return DeclRecordAbbrev; }
-  unsigned getIntegerLiteralAbbrev() const { return IntegerLiteralAbbrev; }
   unsigned getDeclTypedefAbbrev() const { return DeclTypedefAbbrev; }
   unsigned getDeclVarAbbrev() const { return DeclVarAbbrev; }
   unsigned getDeclFieldAbbrev() const { return DeclFieldAbbrev; }
@@ -756,6 +755,11 @@ public:
   unsigned getDeclObjCIvarAbbrev() const { return DeclObjCIvarAbbrev; }
   unsigned getDeclCXXMethodAbbrev() const { return DeclCXXMethodAbbrev; }
 
+  unsigned getDeclRefExprAbbrev() const { return DeclRefExprAbbrev; }
+  unsigned getCharacterLiteralAbbrev() const { return CharacterLiteralAbbrev; }
+  unsigned getIntegerLiteralAbbrev() const { return IntegerLiteralAbbrev; }
+  unsigned getExprImplicitCastAbbrev() const { return ExprImplicitCastAbbrev; }
+
   bool hasChain() const { return Chain; }
 
   // ASTDeserializationListener implementation
diff --git a/clang/lib/Serialization/ASTWriter.cpp b/clang/lib/Serialization/ASTWriter.cpp
index 2b096fc..de270f3 100644
--- a/clang/lib/Serialization/ASTWriter.cpp
+++ b/clang/lib/Serialization/ASTWriter.cpp
@@ -4055,10 +4055,11 @@ ASTWriter::ASTWriter(llvm::BitstreamWriter &Stream)
       NextCXXBaseSpecifiersID(1), TypeExtQualAbbrev(0),
       TypeFunctionProtoAbbrev(0), DeclParmVarAbbrev(0),
       DeclContextLexicalAbbrev(0), DeclContextVisibleLookupAbbrev(0),
-      UpdateVisibleAbbrev(0), DeclRefExprAbbrev(0), CharacterLiteralAbbrev(0),
-      DeclRecordAbbrev(0), IntegerLiteralAbbrev(0), DeclTypedefAbbrev(0),
+      UpdateVisibleAbbrev(0), DeclRecordAbbrev(0), DeclTypedefAbbrev(0),
       DeclVarAbbrev(0), DeclFieldAbbrev(0), DeclEnumAbbrev(0),
-      DeclObjCIvarAbbrev(0), DeclCXXMethodAbbrev(0) {}
+      DeclObjCIvarAbbrev(0), DeclCXXMethodAbbrev(0), DeclRefExprAbbrev(0),
+      CharacterLiteralAbbrev(0), IntegerLiteralAbbrev(0),
+      ExprImplicitCastAbbrev(0) {}
 
 ASTWriter::~ASTWriter() {
   llvm::DeleteContainerSeconds(FileDeclIDs);
diff --git a/clang/lib/Serialization/ASTWriterDecl.cpp b/clang/lib/Serialization/ASTWriterDecl.cpp
index 1c69834..dca7796 100644
--- a/clang/lib/Serialization/ASTWriterDecl.cpp
+++ b/clang/lib/Serialization/ASTWriterDecl.cpp
@@ -1860,6 +1860,24 @@ void ASTWriter::WriteDeclAbbrevs() {
   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 2)); // getKind
   CharacterLiteralAbbrev = Stream.EmitAbbrev(Abv);
 
+  // Abbreviation for EXPR_IMPLICIT_CAST
+  Abv = new BitCodeAbbrev();
+  Abv->Add(BitCodeAbbrevOp(serialization::EXPR_IMPLICIT_CAST));
+  // Stmt
+  // Expr
+  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::VBR, 6)); // Type
+  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //TypeDependent
+  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //ValueDependent
+  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //InstantiationDependent
+  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 1)); //UnexpandedParamPack
+  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetValueKind
+  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 3)); //GetObjectKind
+  // CastExpr
+  Abv->Add(BitCodeAbbrevOp(0)); // PathSize
+  Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Fixed, 6)); // CastKind
+  // ImplicitCastExpr
+  ExprImplicitCastAbbrev = Stream.EmitAbbrev(Abv);
+
   Abv = new BitCodeAbbrev();
   Abv->Add(BitCodeAbbrevOp(serialization::DECL_CONTEXT_LEXICAL));
   Abv->Add(BitCodeAbbrevOp(BitCodeAbbrevOp::Blob));
diff --git a/clang/lib/Serialization/ASTWriterStmt.cpp b/clang/lib/Serialization/ASTWriterStmt.cpp
index cee94c4..462271a 100644
--- a/clang/lib/Serialization/ASTWriterStmt.cpp
+++ b/clang/lib/Serialization/ASTWriterStmt.cpp
@@ -635,6 +635,10 @@ ASTStmtWriter::VisitBinaryConditionalOperator(BinaryConditionalOperator *E) {
 
 void ASTStmtWriter::VisitImplicitCastExpr(ImplicitCastExpr *E) {
   VisitCastExpr(E);
+
+  if (E->path_size() == 0)
+    AbbrevToUse = Writer.getExprImplicitCastAbbrev();
+
   Code = serialization::EXPR_IMPLICIT_CAST;
 }
 
-- 
2.7.4