Start refactoring PIC16 TargetObjectFile code. Eventually, all the stuff from

PIC16Section will move to MCSectionPIC16.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@80021 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Target/PIC16/MCSectionPIC16.h

@@ -18,20 +18,65 @@
 
 namespace llvm {
 
+  /// MCSectionPIC16 - Represents a physical section in PIC16 COFF.
+  /// Contains data objects.
+  ///
   class MCSectionPIC16 : public MCSection {
+    /// Name of the section to uniquely identify it.
     std::string Name;
+
+    /// User can specify an address at which a section should be placed. 
+    /// Negative value here means user hasn't specified any. 
+    int Address; 
+
+    /// FIXME: Keep overlay information here. uncomment the decl below.
+    /// Overlay information - Sections with same color can be overlaid on
+    /// one another.
+    /// std::string Color; 
+
+    /// Conatined data objects.
+    std::vector<const GlobalVariable *>Items;
+
+    /// Total size of all data objects contained here.
+    unsigned Size;
     
-    MCSectionPIC16(const StringRef &name, SectionKind K)
-      : MCSection(K), Name(name) {
+    MCSectionPIC16(const StringRef &name, SectionKind K, int addr)
+      : MCSection(K), Name(name), Address(addr) {
     }
     
   public:
-    
+    /// Return the name of the section.
     const std::string &getName() const { return Name; }
+
+    /// Return the Address of the section.
+    int getAddress() const { return Address; }
+
+    /// PIC16 Terminology for section kinds is as below.
+    /// UDATA - BSS
+    /// IDATA - initialized data (equiv to Metadata) 
+    /// ROMDATA - ReadOnly.
+    /// UDATA_OVR - Sections that can be overlaid. Section of such type is
+    ///             used to contain function autos an frame. We can think of
+    ///             it as equiv to llvm ThreadBSS)
+    /// So, let's have some convenience functions to Map PIC16 Section types 
+    /// to SectionKind just for the sake of better readability.
+    static SectionKind UDATA_Kind() { return SectionKind::getBSS(); } 
+    static SectionKind IDATA_Kind() { return SectionKind::getMetadata(); }
+    static SectionKind ROMDATA_Kind() { return SectionKind::getReadOnly(); }
+    static SectionKind UDATA_OVR_Kind() { return SectionKind::getThreadBSS(); }
+
+    // If we could just do getKind() == UDATA_Kind() ?
+    bool isUDATA_Kind() { return getKind().isBSS(); }
+    bool isIDATA_Kind() { return getKind().isMetadata(); }
+    bool isROMDATA_Kind() { return getKind().isMetadata(); }
+    bool isUDATA_OVR_Kind() { return getKind().isThreadBSS(); }
+
+    /// This would be the only way to create a section. 
+    static MCSectionPIC16 *Create(const StringRef &Name, SectionKind K, 
+                                  int Address, MCContext &Ctx);
     
-    static MCSectionPIC16 *Create(const StringRef &Name, 
-                                  SectionKind K, MCContext &Ctx);
-    
+    /// Override this as PIC16 has its own way of printing switching
+    /// to a section.
     virtual void PrintSwitchToSection(const MCAsmInfo &MAI,
                                       raw_ostream &OS) const;
   };

lib/Target/PIC16/PIC16TargetObjectFile.cpp

@@ -19,9 +19,9 @@
 using namespace llvm;
 
 
-MCSectionPIC16 *MCSectionPIC16::Create(const StringRef &Name, 
-                                       SectionKind K, MCContext &Ctx) {
-  return new (Ctx) MCSectionPIC16(Name, K);
+MCSectionPIC16 *MCSectionPIC16::Create(const StringRef &Name, SectionKind K, 
+                                       int Address, MCContext &Ctx) {
+  return new (Ctx) MCSectionPIC16(Name, K, Address);
 }
 
 
@@ -38,12 +38,12 @@ PIC16TargetObjectFile::PIC16TargetObjectFile()
 }
 
 const MCSectionPIC16 *PIC16TargetObjectFile::
-getPIC16Section(const char *Name, SectionKind Kind) const {
+getPIC16Section(const char *Name, SectionKind Kind, int Address) const {
   MCSectionPIC16 *&Entry = SectionsByName[Name];
   if (Entry)
     return Entry;
 
-  return Entry = MCSectionPIC16::Create(Name, Kind, getContext());
+  return Entry = MCSectionPIC16::Create(Name, Kind, Address, getContext());
 }
 
 

lib/Target/PIC16/PIC16TargetObjectFile.h

@@ -53,7 +53,8 @@ namespace llvm {
     const TargetMachine *TM;
     
     const MCSectionPIC16 *getPIC16Section(const char *Name,
-                                          SectionKind K) const;
+                                          SectionKind K, 
+                                          int Address = -1) const;
   public:
     mutable std::vector<PIC16Section*> BSSSections;
     mutable std::vector<PIC16Section*> IDATASections;