ruby: get rid of RefCnt and Allocator stuff use base/refcnt.hh

This was somewhat tricky because the RefCnt API was somewhat odd.  The
biggest confusion was that the the RefCnt object's constructor that
took a TYPE& cloned the object.  I created an explicit virtual clone()
function for things that took advantage of this version of the
constructor.  I was conservative and used clone() when I was in doubt
of whether or not it was necessary.  I still think that there are
probably too many instances of clone(), but hopefully not too many.

I converted several instances of const MsgPtr & to a simple MsgPtr.
If the function wants to avoid the overhead of creating another
reference, then it should just use a regular pointer instead of a ref
counting ptr.

There were a couple of instances where refcounted objects were created
on the stack.  This seems pretty dangerous since if you ever
accidentally make a reference to that object with a ref counting
pointer, bad things are bound to happen.

2 files changed, 27 insertions, 36 deletions

diff --git a/src/mem/slicc/ast/EnqueueStatementAST.py b/src/mem/slicc/ast/EnqueueStatementAST.py
index faf966460..b27bff629 100644
--- a/src/mem/slicc/ast/EnqueueStatementAST.py
+++ b/src/mem/slicc/ast/EnqueueStatementAST.py
@@ -48,12 +48,12 @@ class EnqueueStatementAST(StatementAST):
         msg_type = self.type_ast.type
 
         # Add new local var to symbol table
-        v = Var(self.symtab, "out_msg", self.location, msg_type, "out_msg",
+        v = Var(self.symtab, "out_msg", self.location, msg_type, "*out_msg",
                 self.pairs)
         self.symtab.newSymbol(v)
 
         # Declare message
-        code("${{msg_type.ident}} out_msg;")
+        code("${{msg_type.ident}} *out_msg = new ${{msg_type.ident}};")
 
         # The other statements
         t = self.statements.generate(code, None)
diff --git a/src/mem/slicc/symbols/Type.py b/src/mem/slicc/symbols/Type.py
index c4b4d4275..cefae16ae 100644
--- a/src/mem/slicc/symbols/Type.py
+++ b/src/mem/slicc/symbols/Type.py
@@ -205,7 +205,6 @@ class Type(Symbol):
 #include <iostream>
 
 #include "mem/ruby/common/Global.hh"
-#include "mem/gems_common/Allocator.hh"
 ''')
 
         for dm in self.data_members.values():
@@ -242,6 +241,26 @@ $klass ${{self.c_ident}}$parent
             code.dedent()
         code('}')
 
+        # ******** Copy constructor ********
+        if not self.isGlobal:
+            code('${{self.c_ident}}(const ${{self.c_ident}}&other)')
+
+            # Call superclass constructor
+            if "interface" in self:
+                code('    : ${{self["interface"]}}(other)')
+
+            code('{')
+            code.indent()
+
+            for dm in self.data_members.values():
+                code('m_${{dm.ident}} = other.m_${{dm.ident}};')
+
+            if self.isMessage:
+                code('proc_id = other.proc_id;')
+
+            code.dedent()
+            code('}')
+
         # ******** Full init constructor ********
         if not self.isGlobal:
             params = [ 'const %s& local_%s' % (dm.type.c_ident, dm.ident) \
@@ -270,44 +289,18 @@ $klass ${{self.c_ident}}$parent
             code.dedent()
             code('}')
 
-        # create a static factory method
-        if "interface" in self:
-            code('''
-static ${{self["interface"]}}*
+        # create a static factory method and a clone member
+        code('''
+static ${{self.c_ident}}*
 create()
 {
     return new ${{self.c_ident}}();
 }
-''')
-
-        # ******** Message member functions ********
-        # FIXME: those should be moved into slicc file, slicc should
-        # support more of the c++ class inheritance
 
-        if self.isMessage:
-            code('''
-Message *
+${{self.c_ident}}*
 clone() const
 {
-    checkAllocator();
-    return s_allocator_ptr->allocate(*this);
-}
-
-void
-destroy()
-{
-    checkAllocator();
-    s_allocator_ptr->deallocate(this);
-}
-
-static Allocator<${{self.c_ident}}>* s_allocator_ptr;
-
-static void
-checkAllocator()
-{
-    if (s_allocator_ptr == NULL) {
-        s_allocator_ptr = new Allocator<${{self.c_ident}}>;
-    }
+     return new ${{self.c_ident}}(*this);
 }
 ''')
 
@@ -414,8 +407,6 @@ operator<<(std::ostream& out, const ${{self.c_ident}}& obj)
 using namespace std;
 ''')
 
-        if self.isMessage:
-            code('Allocator<${{self.c_ident}}>* ${{self.c_ident}}::s_allocator_ptr = NULL;')
         code('''
 /** \\brief Print the state of this object */
 void