* Bringing over SKY PKE disassembler feature from sky branch.

[deliverable/binutils-gdb.git] / gdb / parse.c

diff --git a/gdb/parse.c b/gdb/parse.c
index ad38e8be6046fe4ba92cfcc3b84961320d6b70f2..edb374cea96f659ba9aa4989f46a13f94c057edd 100644 (file)
--- a/gdb/parse.c
+++ b/gdb/parse.c
@@ -59,9 +59,6 @@ free_funcalls PARAMS ((void));
 static void
 prefixify_expression PARAMS ((struct expression *));
 
-static int
-length_of_subexp PARAMS ((struct expression *, int));
-
 static void
 prefixify_subexp PARAMS ((struct expression *, struct expression *, int, int));
 
@@ -104,6 +101,44 @@ unsigned num_std_regs = (sizeof std_regs / sizeof std_regs[0]);
 
 #endif
 
+/* The generic method for targets to specify how their registers are named.
+   The mapping can be derived from three sources: reg_names; std_regs; or
+   a target specific alias hook. */
+
+int
+target_map_name_to_register (str, len)
+     char *str;
+     int len;
+{
+  int i;
+
+  /* First try target specific aliases. We try these first because on some 
+     systems standard names can be context dependent (eg. $pc on a 
+     multiprocessor can be could be any of several PCs).  */
+#ifdef REGISTER_NAME_ALIAS_HOOK
+  i =  REGISTER_NAME_ALIAS_HOOK (str, len);
+  if (i >= 0)
+    return i;
+#endif
+
+  /* Search architectural register name space. */
+  for (i = 0; i < NUM_REGS; i++)
+    if (reg_names[i] && len == strlen (reg_names[i])
+       && STREQN (str, reg_names[i], len))
+      {
+       return i;
+      }
+
+  /* Try standard aliases */
+  for (i = 0; i < num_std_regs; i++)
+    if (std_regs[i].name && len == strlen (std_regs[i].name)
+       && STREQN (str, std_regs[i].name, len))
+      {
+       return std_regs[i].regnum;
+      }
+
+  return -1;
+}
 
 /* Begin counting arguments for a function call,
    saving the data about any containing call.  */
@@ -215,7 +250,7 @@ write_exp_elt_longcst (expelt)
 
 void
 write_exp_elt_dblcst (expelt)
-     double expelt;
+     DOUBLEST expelt;
 {
   union exp_element tmp;
 
@@ -399,6 +434,87 @@ write_exp_msymbol (msymbol, text_symbol_type, data_symbol_type)
   write_exp_elt_opcode (UNOP_MEMVAL);
 }
 \f
+/* Recognize tokens that start with '$'.  These include:
+
+       $regname        A native register name or a "standard
+                       register name".
+
+       $variable       A convenience variable with a name chosen
+                       by the user.
+
+       $digits         Value history with index <digits>, starting
+                       from the first value which has index 1.
+
+       $$digits        Value history with index <digits> relative
+                       to the last value.  I.E. $$0 is the last
+                       value, $$1 is the one previous to that, $$2
+                       is the one previous to $$1, etc.
+
+       $ | $0 | $$0    The last value in the value history.
+
+       $$              An abbreviation for the second to the last
+                       value in the value history, I.E. $$1
+
+   */
+
+void
+write_dollar_variable (str)
+     struct stoken str;
+{
+  /* Handle the tokens $digits; also $ (short for $0) and $$ (short for $$1)
+     and $$digits (equivalent to $<-digits> if you could type that). */
+
+  int negate = 0;
+  int i = 1;
+  /* Double dollar means negate the number and add -1 as well.
+     Thus $$ alone means -1.  */
+  if (str.length >= 2 && str.ptr[1] == '$')
+    {
+      negate = 1;
+      i = 2;
+    }
+  if (i == str.length)
+    {
+      /* Just dollars (one or two) */
+      i = - negate;
+      goto handle_last;
+    }
+  /* Is the rest of the token digits?  */
+  for (; i < str.length; i++)
+    if (!(str.ptr[i] >= '0' && str.ptr[i] <= '9'))
+      break;
+  if (i == str.length)
+    {
+      i = atoi (str.ptr + 1 + negate);
+      if (negate)
+       i = - i;
+      goto handle_last;
+    }
+  
+  /* Handle tokens that refer to machine registers:
+     $ followed by a register name.  */
+  i = target_map_name_to_register( str.ptr + 1, str.length - 1 );
+  if( i >= 0 )
+    goto handle_register;
+
+  /* Any other names starting in $ are debugger internal variables.  */
+
+  write_exp_elt_opcode (OP_INTERNALVAR);
+  write_exp_elt_intern (lookup_internalvar (copy_name (str) + 1));
+  write_exp_elt_opcode (OP_INTERNALVAR); 
+  return;
+ handle_last:
+  write_exp_elt_opcode (OP_LAST);
+  write_exp_elt_longcst ((LONGEST) i);
+  write_exp_elt_opcode (OP_LAST);
+  return;
+ handle_register:
+  write_exp_elt_opcode (OP_REGISTER);
+  write_exp_elt_longcst (i);
+  write_exp_elt_opcode (OP_REGISTER); 
+  return;
+}
+\f
 /* Return a null-terminated temporary copy of the name
    of a string token.  */
 
@@ -434,7 +550,7 @@ prefixify_expression (expr)
 /* Return the number of exp_elements in the subexpression of EXPR
    whose last exp_element is at index ENDPOS - 1 in EXPR.  */
 
-static int
+int
 length_of_subexp (expr, endpos)
      register struct expression *expr;
      register int endpos;
@@ -512,6 +628,8 @@ length_of_subexp (expr, endpos)
       /* fall through */
     case OP_M2_STRING:
     case OP_STRING:
+    case OP_NAME:
+    case OP_EXPRSTRING:
       oplen = longest_to_int (expr->elts[endpos - 2].longconst);
       oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
       break;
@@ -649,6 +767,8 @@ prefixify_subexp (inexpr, outexpr, inend, outbeg)
       /* fall through */
     case OP_M2_STRING:
     case OP_STRING:
+    case OP_NAME:
+    case OP_EXPRSTRING:
       oplen = longest_to_int (inexpr->elts[inend - 2].longconst);
       oplen = 4 + BYTES_TO_EXP_ELEM (oplen + 1);
       break;