'<' for codes for comparison expressions.
'1' for codes for unary arithmetic expressions.
'2' for codes for binary arithmetic expressions.
- 's' for codes for expressions with inherent side effects.
+ 's' for codes for "statement" expressions, which have side-effects,
+ but usually no interesting value.
'e' for codes for other kinds of expressions. */
-/* For `r', `e', `<', `1', `2', `s' and `x' nodes,
- the 4th element is the number of argument slots to allocate.
- This determines the size of the tree node object. */
+/* For `r', `e', `<', `1', `2', and `s' nodes, which use struct
+ tree_exp, the 4th element is the number of argument slots to
+ allocate. This determines the size of the tree node object.
+ Other nodes use different structures, and the size is determined
+ by the tree_union member structure; the 4th element should be
+ zero. Languages that define language-specific 'x' or 'c' codes
+ must define the tree_size langhook to say how big they are. */
/* Any erroneous construct is parsed into a node of this type.
This type of node is accepted without complaint in all contexts
Internally it looks like a STRING_CST node.
There is only one IDENTIFIER_NODE ever made for any particular name.
Use `get_identifier' to get it (or create it, the first time). */
-DEFTREECODE (IDENTIFIER_NODE, "identifier_node", 'x', ((LANG_HOOKS_IDENTIFIER_SIZE - sizeof (struct tree_common) + sizeof (tree) - 1) / sizeof (tree)))
+DEFTREECODE (IDENTIFIER_NODE, "identifier_node", 'x', 0)
/* Has the TREE_VALUE and TREE_PURPOSE fields. */
/* These nodes are made into lists by chaining through the
TREE_CHAIN field. The elements of the list live in the
TREE_VALUE fields, while TREE_PURPOSE fields are occasionally
used as well to get the effect of Lisp association lists. */
-DEFTREECODE (TREE_LIST, "tree_list", 'x', 2)
+DEFTREECODE (TREE_LIST, "tree_list", 'x', 0)
/* These nodes contain an array of tree nodes. */
-DEFTREECODE (TREE_VEC, "tree_vec", 'x', 2)
+DEFTREECODE (TREE_VEC, "tree_vec", 'x', 0)
/* A symbol binding block. These are arranged in a tree,
where the BLOCK_SUBBLOCKS field contains a chain of subblocks
Note: constants of type char in Pascal are INTEGER_CST,
and so are pointer constants such as nil in Pascal or NULL in C.
`(int *) 1' in C also results in an INTEGER_CST. */
-DEFTREECODE (INTEGER_CST, "integer_cst", 'c', 2)
+DEFTREECODE (INTEGER_CST, "integer_cst", 'c', 0)
-/* Contents are in TREE_REAL_CST field. Also there is TREE_CST_RTL. */
-DEFTREECODE (REAL_CST, "real_cst", 'c', 3)
+/* Contents are in TREE_REAL_CST field. */
+DEFTREECODE (REAL_CST, "real_cst", 'c', 0)
/* Contents are in TREE_REALPART and TREE_IMAGPART fields,
- whose contents are other constant nodes.
- Also there is TREE_CST_RTL. */
-DEFTREECODE (COMPLEX_CST, "complex_cst", 'c', 3)
+ whose contents are other constant nodes. */
+DEFTREECODE (COMPLEX_CST, "complex_cst", 'c', 0)
/* Contents are in TREE_VECTOR_CST_ELTS field. */
-DEFTREECODE (VECTOR_CST, "vector_cst", 'c', 3)
+DEFTREECODE (VECTOR_CST, "vector_cst", 'c', 0)
-/* Contents are TREE_STRING_LENGTH and TREE_STRING_POINTER fields.
- Also there is TREE_CST_RTL. */
-DEFTREECODE (STRING_CST, "string_cst", 'c', 3)
+/* Contents are TREE_STRING_LENGTH and TREE_STRING_POINTER fields. */
+DEFTREECODE (STRING_CST, "string_cst", 'c', 0)
/* Declarations. All references to names are represented as ..._DECL nodes.
The decls in one binding context are chained through the TREE_CHAIN field.
/* Constructor: return an aggregate value made from specified components.
In C, this is used only for structure and array initializers.
Also used for SET_TYPE in Chill (and potentially Pascal).
- The first "operand" is really a pointer to the RTL,
- for constant constructors only.
- The second operand is a list of component values
- made out of a chain of TREE_LIST nodes.
+ The operand is a list of component values made out of a chain of
+ TREE_LIST nodes.
For ARRAY_TYPE:
The TREE_PURPOSE of each node is the corresponding index.
The TREE_VALUE specifies a value (index) in the set that is true.
If TREE_PURPOSE is non-NULL, it specifies the lower limit of a
range of true values. Elements not listed are false (not in the set). */
-DEFTREECODE (CONSTRUCTOR, "constructor", 'e', 2)
+DEFTREECODE (CONSTRUCTOR, "constructor", 'e', 1)
/* The expression types are mostly straightforward, with the fourth argument
of DEFTREECODE saying how many operands there are.
/* Evaluate the first operand.
The second operand is a cleanup expression which is evaluated
- before an exit (normal, exception, or jump out) from this expression.
-
- Like a CLEANUP_POINT_EXPR/WITH_CLEANUP_EXPR combination, but those
- always copy the cleanup expression where needed. In contrast,
- TRY_FINALLY_EXPR generates a jump to a cleanup subroutine.
- (At least conceptually; the optimizer could inline the cleanup
- subroutine in the same way it could inline normal subroutines.)
- TRY_FINALLY_EXPR should be used when the cleanup is actual statements
- in the source of the current function (which people might want to
- set breakpoints in). */
+ on any exit (normal, exception, or jump out) from this expression. */
DEFTREECODE (TRY_FINALLY_EXPR, "try_finally", 'e', 2)
/* Used internally for cleanups in the implementation of TRY_FINALLY_EXPR.
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