r243729 - in /trunk/gcc/go/gofrontend: MERGE ex...

[ian@gcc.gnu.org]

Author: ian
Date: Thu Dec 15 22:47:43 2016
New Revision: 243729

URL: https://gcc.gnu.org/viewcvs?rev=243729&root=gcc&view=rev
Log:
	PR go/78763
    compiler: call determine_types even for constant expressions
    
    We need to call determine_types even for constant expressions, since a
    constant expression may include code like unsafe.Sizeof(0).  Something
    needs to determine the type of the untyped 0, and that should be the
    determine_types pass.
    
    Implementing that triggered a compiler crash on test/const1.go because
    it permitted some erroneous constants to make it all the way to the
    backend.  Catch that case by checking whether we get a constant
    overflow error, and marking the expression invalid if we do.  This is
    a good change in any case, as previously we reported the same constant
    overflow error multiple times, and now we only report it once.
    
    Fixes GCC PR 78763.
    
    Reviewed-on: https://go-review.googlesource.com/34496

Modified:
    trunk/gcc/go/gofrontend/MERGE
    trunk/gcc/go/gofrontend/expressions.cc
    trunk/gcc/go/gofrontend/expressions.h