Add a pass to do call graph analyis to overlay the autos and frame sections of

leaf functions. This pass will be extended to color other nodes of the call tree 
as well in future.

llvm-svn: 79631

1 files changed, 29 insertions, 0 deletions

diff --git a/llvm/lib/Target/PIC16/PIC16TargetObjectFile.cpp b/llvm/lib/Target/PIC16/PIC16TargetObjectFile.cpp
index 3ff27a9ae7f..4c2349f9ee4 100644
--- a/llvm/lib/Target/PIC16/PIC16TargetObjectFile.cpp
+++ b/llvm/lib/Target/PIC16/PIC16TargetObjectFile.cpp
@@ -82,6 +82,35 @@ getSectionForFunctionFrame(const std::string &FnName) const {
   return getPIC16Section(T.c_str(), SectionKind::getDataRel());
 }
 
+std::string PIC16TargetObjectFile::getNameForFunctFrame(const Function *F,
+                                                          bool IsAutosSection) {
+  std::string SectionName = F->getName();
+  if (F->hasSection()) {
+    std::string Sectn = F->getSection();
+    std::string StrToFind = "Overlay=";
+    unsigned Pos = Sectn.find(StrToFind);
+    if (Pos != std::string::npos) {
+      Pos += StrToFind.length();
+      std::string Color = "";
+      char c = Sectn.at(Pos);
+      // A Color can only consist on upper case letters or underscore.
+      while ((c >= 'A' && c<= 'Z') || c == '_') {
+        Color.append(1,c);
+        Pos++;
+        if (Pos >= Sectn.length())
+          break;
+        c = Sectn.at(Pos);
+      }
+      // Autos Section need to be given a different name from function frame. 
+      if (IsAutosSection)
+        SectionName = PAN::getAutosSectionForColor(Color);
+      else
+        SectionName = Color;
+    }
+  }
+  return SectionName;
+}
+
 const MCSection *
 PIC16TargetObjectFile::getBSSSectionForGlobal(const GlobalVariable *GV) const {
   assert(GV->hasInitializer() && "This global doesn't need space");