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CONSTRUCTOR: Add comments.

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From-SVN: r11075
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Per Bothner 1996-01-19 17:40:09 -08:00
parent b650314b84
commit 69b4bf9847
1 changed files with 17 additions and 1 deletions
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18
gcc/tree.def
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@ -365,10 +365,26 @@ DEFTREECODE (ARRAY_REF, "array_ref", "r", 2)
/* 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. */
made out of a chain of TREE_LIST nodes.
For ARRAY_TYPE:
The TREE_PURPOSE of each node is the corresponding index.
If the TREE_PURPOSE is a RANGE_EXPR, it is a short-hand for many nodes,
one for each index in the range. (If the corresponding TREE_VALUE
has side-effects, they are evaluated once for each element. Wrap the
value in a SAVE_EXPR if you want to evaluate side effects only once.)
For RECORD_TYPE, UNION_TYPE, or QUAL_UNION_TYPE:
The TREE_PURPOSE of each node is a FIELD_DECL.
For SET_TYPE:
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)
/* The expression types are mostly straightforward, with the fourth argument