-/* Indexed by enum tree_code, contains a character which is
- `<' for a comparison expression, `1', for a unary arithmetic
- expression, `2' for a binary arithmetic expression, `e' for
- other types of expressions, `r' for a reference, `c' for a
- constant, `d' for a decl, `t' for a type, `s' for a statement,
- and `x' for anything else (TREE_LIST, IDENTIFIER, etc). */
+/* Tree code classes. */
+
+/* Each tree_code has an associated code class represented by a
+ TREE_CODE_CLASS. */
+
+enum tree_code_class {
+ tcc_exceptional, /* An exceptional code (fits no category). */
+ tcc_constant, /* A constant. */
+ /* Order of tcc_type and tcc_declaration is important. */
+ tcc_type, /* A type object code. */
+ tcc_declaration, /* A declaration (also serving as variable refs). */
+ tcc_reference, /* A reference to storage. */
+ tcc_comparison, /* A comparison expression. */
+ tcc_unary, /* A unary arithmetic expression. */
+ tcc_binary, /* A binary arithmetic expression. */
+ tcc_statement, /* A statement expression, which have side effects
+ but usually no interesting value. */
+ tcc_expression /* Any other expression. */
+};
+
+/* Each tree code class has an associated string representation.
+ These must correspond to the tree_code_class entries. */
+
+extern const char *const tree_code_class_strings[];
+
+/* Returns the string representing CLASS. */
+
+#define TREE_CODE_CLASS_STRING(CLASS)\
+ tree_code_class_strings[(int) (CLASS)]