Implementing unused function warning.

llvm-svn: 95940

2 files changed, 25 insertions, 0 deletions

diff --git a/clang/lib/Frontend/PCHReader.cpp b/clang/lib/Frontend/PCHReader.cpp
index 2a22132ea84..f6f4a78c13e 100644
--- a/clang/lib/Frontend/PCHReader.cpp
+++ b/clang/lib/Frontend/PCHReader.cpp
@@ -1332,6 +1332,14 @@ PCHReader::ReadPCHBlock() {
       TentativeDefinitions.swap(Record);
       break;
 
+    case pch::UNUSED_STATIC_FUNCS:
+      if (!UnusedStaticFuncs.empty()) {
+        Error("duplicate UNUSED_STATIC_FUNCS record in PCH file");
+        return Failure;
+      }
+      UnusedStaticFuncs.swap(Record);
+      break;
+        
     case pch::LOCALLY_SCOPED_EXTERNAL_DECLS:
       if (!LocallyScopedExternalDecls.empty()) {
         Error("duplicate LOCALLY_SCOPED_EXTERNAL_DECLS record in PCH file");
@@ -2479,6 +2487,13 @@ void PCHReader::InitializeSema(Sema &S) {
     VarDecl *Var = cast<VarDecl>(GetDecl(TentativeDefinitions[I]));
     SemaObj->TentativeDefinitions.push_back(Var);
   }
+  
+  // If there were any unused static functions, deserialize them and add to
+  // Sema's list of unused static functions.
+  for (unsigned I = 0, N = UnusedStaticFuncs.size(); I != N; ++I) {
+    FunctionDecl *FD = cast<FunctionDecl>(GetDecl(UnusedStaticFuncs[I]));
+    SemaObj->UnusedStaticFuncs.push_back(FD);
+  }
 
   // If there were any locally-scoped external declarations,
   // deserialize them and add them to Sema's table of locally-scoped
diff --git a/clang/lib/Frontend/PCHWriter.cpp b/clang/lib/Frontend/PCHWriter.cpp
index c7e6058d655..4c99dbe2450 100644
--- a/clang/lib/Frontend/PCHWriter.cpp
+++ b/clang/lib/Frontend/PCHWriter.cpp
@@ -545,6 +545,7 @@ void PCHWriter::WriteBlockInfoBlock() {
   RECORD(SPECIAL_TYPES);
   RECORD(STATISTICS);
   RECORD(TENTATIVE_DEFINITIONS);
+  RECORD(UNUSED_STATIC_FUNCS);
   RECORD(LOCALLY_SCOPED_EXTERNAL_DECLS);
   RECORD(SELECTOR_OFFSETS);
   RECORD(METHOD_POOL);
@@ -1982,6 +1983,11 @@ void PCHWriter::WritePCH(Sema &SemaRef, MemorizeStatCalls *StatCalls,
     AddDeclRef(SemaRef.TentativeDefinitions[i], TentativeDefinitions);
   }
 
+  // Build a record containing all of the static unused functions in this file.
+  RecordData UnusedStaticFuncs;
+  for (unsigned i=0, e = SemaRef.UnusedStaticFuncs.size(); i !=e; ++i) 
+    AddDeclRef(SemaRef.UnusedStaticFuncs[i], UnusedStaticFuncs);
+              
   // Build a record containing all of the locally-scoped external
   // declarations in this header file. Generally, this record will be
   // empty.
@@ -2083,6 +2089,10 @@ void PCHWriter::WritePCH(Sema &SemaRef, MemorizeStatCalls *StatCalls,
   if (!TentativeDefinitions.empty())
     Stream.EmitRecord(pch::TENTATIVE_DEFINITIONS, TentativeDefinitions);
 
+  // Write the record containing unused static functions.
+  if (!UnusedStaticFuncs.empty())
+    Stream.EmitRecord(pch::UNUSED_STATIC_FUNCS, UnusedStaticFuncs);
+  
   // Write the record containing locally-scoped external definitions.
   if (!LocallyScopedExternalDecls.empty())
     Stream.EmitRecord(pch::LOCALLY_SCOPED_EXTERNAL_DECLS,