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gfc-internals.texi (gfc_code): Document BLOCK and ASSOCIATE.

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2010-07-04  Daniel Kraft  <d@domob.eu>

	* gfc-internals.texi (gfc_code): Document BLOCK and ASSOCIATE.

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Daniel Kraft 2010-07-04 20:59:10 +02:00 committed by Daniel Kraft
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gcc/fortran/ChangeLog
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@ -1,3 +1,7 @@
2010-07-04 Daniel Kraft <d@domob.eu>
* gfc-internals.texi (gfc_code): Document BLOCK and ASSOCIATE.
2010-07-04 Paul Thomas <pault@gcc.gnu.org>
PR fortran/44596

27
gcc/fortran/gfc-internals.texi
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@ -406,6 +406,33 @@ case-block, and @code{extx.case_list} contains the case-values this block
corresponds to. The @code{block} member links to the next case in the list.
@subsection @code{BLOCK} and @code{ASSOCIATE}
The code related to a @code{BLOCK} statement is stored inside an
@code{gfc_code} structure (say @var{c})
with @code{c.op} set to @code{EXEC_BLOCK}. The
@code{gfc_namespace} holding the locally defined variables of the
@code{BLOCK} is stored in @code{c.ext.block.ns}. The code inside the
construct is in @code{c.code}.
@code{ASSOCIATE} constructs are based on @code{BLOCK} and thus also have
the internal storage structure described above (including @code{EXEC_BLOCK}).
However, for them @code{c.ext.block.assoc} is set additionally and points
to a linked list of @code{gfc_association_list} structures. Those
structures basically store a link of associate-names to target expressions.
The associate-names themselves are still also added to the @code{BLOCK}'s
namespace as ordinary symbols, but they have their @code{gfc_symbol}'s
member @code{assoc} set also pointing to the association-list structure.
This way associate-names can be distinguished from ordinary variables
and their target expressions identified.
For association to expressions (as opposed to variables), at the very beginning
of the @code{BLOCK} construct assignments are automatically generated to
set the corresponding variables to their target expressions' values, and
later on the compiler simply disallows using such associate-names in contexts
that may change the value.
@c gfc_expr
@c --------