--- a/src/share/vm/adlc/adlparse.cpp	Fri Nov 15 14:09:26 2013 -0500
+++ b/src/share/vm/adlc/adlparse.cpp	Fri Nov 15 12:01:00 2013 -0800
@@ -3996,13 +3996,11 @@
 //------------------------------expand_parse-----------------------------------
 ExpandRule* ADLParser::expand_parse(InstructForm *instr) {
   char         *ident, *ident2;
-  OperandForm  *oper;
-  InstructForm *ins;
   NameAndList  *instr_and_operands = NULL;
   ExpandRule   *exp = new ExpandRule();
 
-  // Expand is a block containing an ordered list of instructions, each of
-  // which has an ordered list of operands.
+  // Expand is a block containing an ordered list of operands with initializers,
+  // or instructions, each of which has an ordered list of operands.
   // Check for block delimiter
   skipws();                        // Skip leading whitespace
   if ((_curchar != '%')
@@ -4016,12 +4014,30 @@
     if (ident == NULL) {
       parse_err(SYNERR, "identifier expected at %c\n", _curchar);
       continue;
-    }                              // Check that you have a valid instruction
+    }
+
+    // Check whether we should parse an instruction or operand.
     const Form *form = _globalNames[ident];
-    ins = form ? form->is_instruction() : NULL;
-    if (ins == NULL) {
+    bool parse_oper = false;
+    bool parse_ins  = false;
+    if (form == NULL) {
+      skipws();
+      // Check whether this looks like an instruction specification.  If so,
+      // just parse the instruction.  The declaration of the instruction is
+      // not needed here.
+      if (_curchar == '(') parse_ins = true;
+    } else if (form->is_instruction()) {
+      parse_ins = true;
+    } else if (form->is_operand()) {
+      parse_oper = true;
+    } else {
+      parse_err(SYNERR, "instruction/operand name expected at %s\n", ident);
+      continue;
+    }
+
+    if (parse_oper) {
       // This is a new operand
-      oper = form ? form->is_operand() : NULL;
+      OperandForm *oper = form->is_operand();
       if (oper == NULL) {
         parse_err(SYNERR, "instruction/operand name expected at %s\n", ident);
         continue;
@@ -4056,6 +4072,7 @@
       skipws();
     }
     else {
+      assert(parse_ins, "sanity");
       // Add instruction to list
       instr_and_operands = new NameAndList(ident);
       // Grab operands, build nameList of them, and then put into dictionary
@@ -4079,7 +4096,7 @@
           parse_err(SYNERR, "operand name expected at %s\n", ident2);
           continue;
         }
-        oper = form2->is_operand();
+        OperandForm *oper = form2->is_operand();
         if (oper == NULL && !form2->is_opclass()) {
           parse_err(SYNERR, "operand name expected at %s\n", ident2);
           continue;

--- a/src/share/vm/adlc/formssel.cpp	Fri Nov 15 14:09:26 2013 -0500
+++ b/src/share/vm/adlc/formssel.cpp	Fri Nov 15 12:01:00 2013 -0800
@@ -1276,11 +1276,11 @@
     return;
   }
   if (strcmp(rep_var, "constantoffset") == 0) {
-    fprintf(fp, "st->print(\"#%%d\", constant_offset());\n");
+    fprintf(fp, "st->print(\"#%%d\", constant_offset_unchecked());\n");
     return;
   }
   if (strcmp(rep_var, "constantaddress") == 0) {
-    fprintf(fp, "st->print(\"constant table base + #%%d\", constant_offset());\n");
+    fprintf(fp, "st->print(\"constant table base + #%%d\", constant_offset_unchecked());\n");
     return;
   }
 

--- a/src/share/vm/adlc/output_c.cpp	Fri Nov 15 14:09:26 2013 -0500
+++ b/src/share/vm/adlc/output_c.cpp	Fri Nov 15 12:01:00 2013 -0800
@@ -1570,6 +1570,13 @@
       new_id = expand_instr->name();
 
       InstructForm* expand_instruction = (InstructForm*)globalAD->globalNames()[new_id];
+
+      if (!expand_instruction) {
+        globalAD->syntax_err(node->_linenum, "In %s: instruction %s used in expand not declared\n",
+                             node->_ident, new_id);
+        continue;
+      }
+
       if (expand_instruction->has_temps()) {
         globalAD->syntax_err(node->_linenum, "In %s: expand rules using instructs with TEMPs aren't supported: %s",
                              node->_ident, new_id);
@@ -1628,6 +1635,13 @@
         // Use 'parameter' at current position in list of new instruction's formals
         // instead of 'opid' when looking up info internal to new_inst
         const char *parameter = formal_lst->iter();
+        if (!parameter) {
+          globalAD->syntax_err(node->_linenum, "Operand %s of expand instruction %s has"
+                               " no equivalent in new instruction %s.",
+                               opid, node->_ident, new_inst->_ident);
+          assert(0, "Wrong expand");
+        }
+
         // Check for an operand which is created in the expand rule
         if ((exp_pos = node->_exprule->_newopers.index(opid)) != -1) {
           new_pos = new_inst->operand_position(parameter,Component::USE);
@@ -2103,16 +2117,21 @@
         if (strcmp(rep_var,"$reg") == 0 || reg_conversion(rep_var) != NULL) {
           _reg_status  = LITERAL_ACCESSED;
         } else {
+          _AD.syntax_err(_encoding._linenum,
+                         "Invalid access to literal register parameter '%s' in %s.\n",
+                         rep_var, _encoding._name);
           assert( false, "invalid access to literal register parameter");
         }
       }
       // literal constant parameters must be accessed as a 'constant' field
-      if ( _constant_status != LITERAL_NOT_SEEN ) {
-        assert( _constant_status == LITERAL_SEEN, "Must have seen constant literal before now");
-        if( strcmp(rep_var,"$constant") == 0 ) {
-          _constant_status  = LITERAL_ACCESSED;
+      if (_constant_status != LITERAL_NOT_SEEN) {
+        assert(_constant_status == LITERAL_SEEN, "Must have seen constant literal before now");
+        if (strcmp(rep_var,"$constant") == 0) {
+          _constant_status = LITERAL_ACCESSED;
         } else {
-          assert( false, "invalid access to literal constant parameter");
+          _AD.syntax_err(_encoding._linenum,
+                         "Invalid access to literal constant parameter '%s' in %s.\n",
+                         rep_var, _encoding._name);
         }
       }
     } // end replacement and/or subfield

--- a/src/share/vm/opto/machnode.cpp	Fri Nov 15 14:09:26 2013 -0500
+++ b/src/share/vm/opto/machnode.cpp	Fri Nov 15 12:01:00 2013 -0800
@@ -505,6 +505,9 @@
   return _constant.offset();
 }
 
+int MachConstantNode::constant_offset_unchecked() const {
+  return _constant.offset();
+}
 
 //=============================================================================
 #ifndef PRODUCT

--- a/src/share/vm/opto/machnode.hpp	Fri Nov 15 14:09:26 2013 -0500
+++ b/src/share/vm/opto/machnode.hpp	Fri Nov 15 12:01:00 2013 -0800
@@ -416,6 +416,8 @@
 
   int  constant_offset();
   int  constant_offset() const { return ((MachConstantNode*) this)->constant_offset(); }
+  // Unchecked version to avoid assertions in debug output.
+  int  constant_offset_unchecked() const;
 };
 
 //------------------------------MachUEPNode-----------------------------------