MEM: Make port proxies use references rather than pointers

This patch is adding a clearer design intent to all objects that would
not be complete without a port proxy by making the proxies members
rathen than dynamically allocated. In essence, if NULL would not be a
valid value for the proxy, then we avoid using a pointer to make this
clear.

The same approach is used for the methods using these proxies, such as
loadSections, that now use references rather than pointers to better
reflect the fact that NULL would not be an acceptable value (in fact
the code would break and that is how this patch started out).

Overall the concept of "using a reference to express unconditional
composition where a NULL pointer is never valid" could be done on a
much broader scale throughout the code base, but for now it is only
done in the locations affected by the proxies.

6 files changed, 11 insertions, 11 deletions

diff --git a/src/base/loader/elf_object.cc b/src/base/loader/elf_object.cc
index 80800e862..e48678bbb 100644
--- a/src/base/loader/elf_object.cc
+++ b/src/base/loader/elf_object.cc
@@ -414,7 +414,7 @@ ElfObject::loadLocalSymbols(SymbolTable *symtab, Addr addrMask)
 }
 
 bool
-ElfObject::loadSections(PortProxy* memProxy, Addr addrMask)
+ElfObject::loadSections(PortProxy& memProxy, Addr addrMask)
 {
     if (!ObjectFile::loadSections(memProxy, addrMask))
         return false;
diff --git a/src/base/loader/elf_object.hh b/src/base/loader/elf_object.hh
index afb61c21d..350a80db1 100644
--- a/src/base/loader/elf_object.hh
+++ b/src/base/loader/elf_object.hh
@@ -65,7 +65,7 @@ class ElfObject : public ObjectFile
   public:
     virtual ~ElfObject() {}
 
-    bool loadSections(PortProxy *memProxy,
+    bool loadSections(PortProxy& memProxy,
             Addr addrMask = std::numeric_limits<Addr>::max());
     virtual bool loadGlobalSymbols(SymbolTable *symtab, Addr addrMask =
             std::numeric_limits<Addr>::max());
diff --git a/src/base/loader/hex_file.cc b/src/base/loader/hex_file.cc
index d38c0fb62..bfebc1b44 100755
--- a/src/base/loader/hex_file.cc
+++ b/src/base/loader/hex_file.cc
@@ -59,7 +59,7 @@ HexFile::~HexFile()
 }
 
 bool
-HexFile::loadSections(PortProxy* memProxy)
+HexFile::loadSections(PortProxy& memProxy)
 {
     char Line[64];
     Addr MemAddr;
@@ -71,7 +71,7 @@ HexFile::loadSections(PortProxy* memProxy)
         parseLine(Line, &MemAddr, &Data);
         if (MemAddr != 0) {
             // Now, write to memory
-            memProxy->writeBlob(MemAddr << 2, (uint8_t *)&Data, sizeof(Data));
+            memProxy.writeBlob(MemAddr << 2, (uint8_t *)&Data, sizeof(Data));
         }
     }
     return true;
diff --git a/src/base/loader/hex_file.hh b/src/base/loader/hex_file.hh
index 514a02a1e..fe34fddf0 100755
--- a/src/base/loader/hex_file.hh
+++ b/src/base/loader/hex_file.hh
@@ -52,7 +52,7 @@ class HexFile
     virtual ~HexFile();
 
     void close();
-    bool loadSections(PortProxy* memProxy);
+    bool loadSections(PortProxy& memProxy);
 };
 
 #endif // __BASE_LOADER_HEX_FILE_HH__
diff --git a/src/base/loader/object_file.cc b/src/base/loader/object_file.cc
index eaf0443bf..420611d83 100644
--- a/src/base/loader/object_file.cc
+++ b/src/base/loader/object_file.cc
@@ -65,16 +65,16 @@ ObjectFile::~ObjectFile()
 
 
 bool
-ObjectFile::loadSection(Section *sec, PortProxy* memProxy, Addr addrMask)
+ObjectFile::loadSection(Section *sec, PortProxy& memProxy, Addr addrMask)
 {
     if (sec->size != 0) {
         Addr addr = sec->baseAddr & addrMask;
         if (sec->fileImage) {
-            memProxy->writeBlob(addr, sec->fileImage, sec->size);
+            memProxy.writeBlob(addr, sec->fileImage, sec->size);
         }
         else {
             // no image: must be bss
-            memProxy->memsetBlob(addr, 0, sec->size);
+            memProxy.memsetBlob(addr, 0, sec->size);
         }
     }
     return true;
@@ -82,7 +82,7 @@ ObjectFile::loadSection(Section *sec, PortProxy* memProxy, Addr addrMask)
 
 
 bool
-ObjectFile::loadSections(PortProxy* memProxy, Addr addrMask)
+ObjectFile::loadSections(PortProxy& memProxy, Addr addrMask)
 {
     return (loadSection(&text, memProxy, addrMask)
             && loadSection(&data, memProxy, addrMask)
diff --git a/src/base/loader/object_file.hh b/src/base/loader/object_file.hh
index ce58a2c4f..2ec41bf12 100644
--- a/src/base/loader/object_file.hh
+++ b/src/base/loader/object_file.hh
@@ -83,7 +83,7 @@ class ObjectFile
 
     void close();
 
-    virtual bool loadSections(PortProxy *memProxy, Addr addrMask =
+    virtual bool loadSections(PortProxy& memProxy, Addr addrMask =
             std::numeric_limits<Addr>::max());
     virtual bool loadGlobalSymbols(SymbolTable *symtab, Addr addrMask =
             std::numeric_limits<Addr>::max()) = 0;
@@ -111,7 +111,7 @@ class ObjectFile
     Section data;
     Section bss;
 
-    bool loadSection(Section *sec, PortProxy* memProxy, Addr addrMask);
+    bool loadSection(Section *sec, PortProxy& memProxy, Addr addrMask);
     void setGlobalPointer(Addr global_ptr) { globalPtr = global_ptr; }
 
   public: