* findvar.c, value.h (symbol_read_needs_frame): New function.

* c-exp.y, m2-exp.y: Call it instead of having our own switch on
	the symbol's class.
	* valops.c (value_of_variable): Use symbol_read_needs_frame to
	decide whether we care about finding a frame.

gdb/ChangeLog

@@ -1,3 +1,11 @@
+Fri Oct  8 14:56:21 1993  Jim Kingdon  (kingdon@lioth.cygnus.com)
+
+	* findvar.c, value.h (symbol_read_needs_frame): New function.
+	* c-exp.y, m2-exp.y: Call it instead of having our own switch on
+	the symbol's class.
+	* valops.c (value_of_variable): Use symbol_read_needs_frame to
+	decide whether we care about finding a frame.
+
 Fri Oct  8 02:34:21 1993  Peter Schauer  (pes@regent.e-technik.tu-muenchen.de)
 
 	* blockframe.c (get_frame_block):  Do not adjust pc if the frame

gdb/c-exp.y

@@ -659,41 +659,14 @@ variable:	name_not_typename
 
 			  if (sym)
 			    {
-			      switch (SYMBOL_CLASS (sym))
+			      if (symbol_read_needs_frame (sym))
 				{
-				case LOC_REGISTER:
-				case LOC_ARG:
-				case LOC_REF_ARG:
-				case LOC_REGPARM:
-				case LOC_REGPARM_ADDR:
-				case LOC_LOCAL:
-				case LOC_LOCAL_ARG:
-				case LOC_BASEREG:
-				case LOC_BASEREG_ARG:
 				  if (innermost_block == 0 ||
 				      contained_in (block_found, 
 						    innermost_block))
 				    innermost_block = block_found;
-				case LOC_UNDEF:
-				case LOC_CONST:
-				case LOC_STATIC:
-				case LOC_TYPEDEF:
-				case LOC_LABEL:
-				case LOC_BLOCK:
-				case LOC_CONST_BYTES:
-				case LOC_OPTIMIZED_OUT:
-
-				  /* In this case the expression can
-				     be evaluated regardless of what
-				     frame we are in, so there is no
-				     need to check for the
-				     innermost_block.  These cases are
-				     listed so that gcc -Wall will
-				     report types that may not have
-				     been considered.  */
-
-				  break;
 				}
+
 			      write_exp_elt_opcode (OP_VAR_VALUE);
 			      /* We want to use the selected frame, not
 				 another more inner frame which happens to

gdb/findvar.c

@@ -467,7 +467,7 @@ read_register (regno)
 void
 write_register (regno, val)
      int regno;
-     long val;
+     LONGEST val;
 {
   PTR buf;
   int size;
@@ -518,6 +518,45 @@ supply_register (regno, val)
 #endif
 }
 
+/* Will calling read_var_value or locate_var_value on SYM end
+   up caring what frame it is being evaluated relative to?  SYM must
+   be non-NULL.  */
+int
+symbol_read_needs_frame (sym)
+     struct symbol *sym;
+{
+  switch (SYMBOL_CLASS (sym))
+    {
+      /* All cases listed explicitly so that gcc -Wall will detect it if
+	 we failed to consider one.  */
+    case LOC_REGISTER:
+    case LOC_ARG:
+    case LOC_REF_ARG:
+    case LOC_REGPARM:
+    case LOC_REGPARM_ADDR:
+    case LOC_LOCAL:
+    case LOC_LOCAL_ARG:
+    case LOC_BASEREG:
+    case LOC_BASEREG_ARG:
+      return 1;
+
+    case LOC_UNDEF:
+    case LOC_CONST:
+    case LOC_STATIC:
+    case LOC_TYPEDEF:
+
+    case LOC_LABEL:
+      /* Getting the address of a label can be done independently of the block,
+	 even if some *uses* of that address wouldn't work so well without
+	 the right frame.  */
+
+    case LOC_BLOCK:
+    case LOC_CONST_BYTES:
+    case LOC_OPTIMIZED_OUT:
+      return 0;
+    }
+}
+
 /* Given a struct symbol for a variable,
    and a stack frame id, read the value of the variable
    and return a (pointer to a) struct value containing the value. 

gdb/m2-exp.y

@@ -599,35 +599,14 @@ variable:	NAME
 					       NULL);
 			  if (sym)
 			    {
-			      switch (sym->class)
+			      if (symbol_read_needs_frame (sym))
 				{
-				case LOC_REGISTER:
-				case LOC_ARG:
-				case LOC_LOCAL:
-				case LOC_REF_ARG:
-				case LOC_REGPARM:
-				case LOC_REGPARM_ADDR:
-				case LOC_LOCAL_ARG:
-				case LOC_BASEREG:
-				case LOC_BASEREG_ARG:
 				  if (innermost_block == 0 ||
-				      contained_in (block_found,
+				      contained_in (block_found, 
 						    innermost_block))
 				    innermost_block = block_found;
-				  break;
-
-				case LOC_UNDEF:
-				case LOC_CONST:
-				case LOC_STATIC:
-				case LOC_TYPEDEF:
-				case LOC_LABEL:	/* maybe should go above? */
-				case LOC_BLOCK:
-				case LOC_CONST_BYTES:
-				case LOC_OPTIMIZED_OUT:
-				  /* These are listed so gcc -Wall will reveal
-				     un-handled cases.  */
-				  break;
 				}
+
 			      write_exp_elt_opcode (OP_VAR_VALUE);
 			      /* We want to use the selected frame, not
 				 another more inner frame which happens to

gdb/valops.c

@@ -511,7 +511,7 @@ value_of_variable (var, b)
   else
     {
       fr = block_innermost_frame (b);
-      if (fr == NULL)
+      if (fr == NULL && symbol_read_needs_frame (var))
 	{
 	  if (BLOCK_FUNCTION (b) != NULL
 	      && SYMBOL_NAME (BLOCK_FUNCTION (b)) != NULL)