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(layout_type... 

(layout_type, case ARRAY_TYPE): Compute length using MAX of length and
zero if sizetype signed and neither bound constant.

From-SVN: r9668
This commit is contained in:
Richard Kenner 1995-05-12 18:31:57 -04:00
parent 74a35b2b7d
commit 36427b78ad
1 changed files with 10 additions and 1 deletions
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11
gcc/stor-layout.c
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@ -1,5 +1,5 @@
/* C-compiler utilities for types and variables storage layout
Copyright (C) 1987, 1988, 1992, 1993, 1994, 1995 Free Software Foundation, Inc.
Copyright (C) 1987, 88, 92, 93, 94, 1995 Free Software Foundation, Inc.
This file is part of GNU CC.
@ -740,6 +740,15 @@ layout_type (type)
size_binop (MINUS_EXPR, TYPE_MAX_VALUE (index),
TYPE_MIN_VALUE (index)));
/* If neither bound is a constant and sizetype is signed, make
sure the size is never negative. We should really do this
if *either* bound is non-constant, but this is the best
compromise between C and Ada. */
if (! TREE_UNSIGNED (sizetype)
&& TREE_CODE (TYPE_MIN_VALUE (index)) != INTEGER_CST
&& TREE_CODE (TYPE_MAX_VALUE (index)) != INTEGER_CST)
length = size_binop (MAX_EXPR, length, size_zero_node);
TYPE_SIZE (type) = size_binop (MULT_EXPR, length,
TYPE_SIZE (element));
}