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Re: [gortran, PATCH] Fix PR 18937


Tobias Schlüter wrote:

Of course, life is not as simple as one would hope: in order to determine if a branch is valid we have to know if the branch target is an END {DO,SELECT,IF} statement (can someone point me to the relevant quote in the standard, I couldn't seem to find it.

Quoting the 2003 Standard:


IF statement (page 156-157):

An ELSE IF statement or an ELSE statement shall not be a branch target statement. It is permissible to branch to an END IF statement only from with its IF construct.

CASE statement (page 159):

A CASE statement shall not be a branch target statement. It is permissible to branch to an [END SELECT statement] only from within its CASE construct.

DO statement (page 167):

In a block DO construct, a transfer of control to the [END DO statement] has the same effect as execution of a CYCLE statement belonging to that construct.

(page 168):

(4) Transfer of control from a statement within the range of a DO
    construct to a statement that is neither the [END DO statement]
    nor within the range of the same DO construct [terminates the
    loop].

I think I've got them all ...

Cheers,

--
Toon Moene - e-mail: toon@moene.indiv.nluug.nl - phone: +31 346 214290
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Who's working on GNU Fortran: http://gcc.gnu.org/ml/gcc/2007-01/msg00059.html



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