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Update CLEANUP_POINT_EXPR docs. 

From-SVN: r9118
This commit is contained in:
Jason Merrill 1995-03-03 03:45:02 +00:00
parent f283f66b1f
commit 8736e83608
1 changed files with 14 additions and 2 deletions
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gcc/tree.def
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@ -444,8 +444,20 @@ DEFTREECODE (METHOD_CALL_EXPR, "method_call_expr", "e", 4)
DEFTREECODE (WITH_CLEANUP_EXPR, "with_cleanup_expr", "e", 3)
/* Specify a cleanup point.
Operand 0 is the expression that has cleanups that we want ensure are
cleaned up. */
Operand 0 is an expression that may have cleanups. If it does, those
cleanups are executed after the expression is expanded.
Note that if the expression is a reference to storage, it is forced out
of memory before the cleanups are run. This is necessary to handle
cases where the cleanups modify the storage referenced; in the
expression 't.i', if 't' is a struct with an integer member 'i' and a
cleanup which modifies 'i', the value of the expression depends on
whether the cleanup is run before or after 't.i' is evaluated. When
expand_expr is run on 't.i', it returns a MEM. This is not good enough;
the value of 't.i' must be forced out of memory.
As a consequence, the operand of a CLEANUP_POINT_EXPR must not have
BLKmode, because it will not be forced out of memory. */
DEFTREECODE (CLEANUP_POINT_EXPR, "cleanup_point_expr", "e", 1)
/* The following two codes are used in languages that have types where