OpenE2K/gcc
2
0
Fork 0
Code Issues Pull Requests Projects Releases Wiki Activity

*** empty log message ***

Browse Source 
From-SVN: r451
This commit is contained in:
Richard Stallman 1992-03-12 04:27:36 +00:00
parent 1d0d98f38c
commit 4e4b555d33
1 changed files with 19 additions and 19 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

38
gcc/stor-layout.c
View File

@ -57,6 +57,11 @@ tree
get_pending_sizes ()
{
tree chain = pending_sizes;
tree t;
/* Put each SAVE_EXPR into the current function. */
for (t = chain; t; t = TREE_CHAIN (t))
SAVE_EXPR_CONTEXT (TREE_VALUE (t)) = current_function_decl;
pending_sizes = 0;
return chain;
}
@ -64,7 +69,7 @@ get_pending_sizes ()
/* Given a size SIZE that isn't constant, return a SAVE_EXPR
to serve as the actual size-expression for a type or decl. */
static tree
tree
variable_size (size)
tree size;
{
@ -686,15 +691,13 @@ layout_type (type)
= mode_for_size (TREE_INT_CST_LOW (TYPE_SIZE (type)),
MODE_INT, 1);
#ifdef STRICT_ALIGNMENT
if (TYPE_ALIGN (type) < BIGGEST_ALIGNMENT
if (STRICT_ALIGNMENT && TYPE_ALIGN (type) < BIGGEST_ALIGNMENT
&& TYPE_ALIGN (type) < TREE_INT_CST_LOW (TYPE_SIZE (type))
&& TYPE_MODE (type) != BLKmode)
{
TYPE_NO_FORCE_BLK (type) = 1;
TYPE_MODE (type) = BLKmode;
}
#endif
}
break;
}
@ -741,9 +744,10 @@ layout_type (type)
/* If structure's known alignment is less than
what the scalar mode would need, and it matters,
then stick with BLKmode. */
#ifdef STRICT_ALIGNMENT
if (! (TYPE_ALIGN (type) >= BIGGEST_ALIGNMENT
|| TYPE_ALIGN (type) >= TREE_INT_CST_LOW (TYPE_SIZE (type))))
if (STRICT_ALIGNMENT
&& ! (TYPE_ALIGN (type) >= BIGGEST_ALIGNMENT
|| (TYPE_ALIGN (type)
>= TREE_INT_CST_LOW (TYPE_SIZE (type)))))
{
if (TYPE_MODE (type) != BLKmode)
/* If this is the only reason this type is BLKmode,
@ -751,7 +755,7 @@ layout_type (type)
TYPE_NO_FORCE_BLK (type) = 1;
TYPE_MODE (type) = BLKmode;
}
#endif
record_lose: ;
}
@ -771,11 +775,9 @@ layout_type (type)
/* If structure's known alignment is less than
what the scalar mode would need, and it matters,
then stick with BLKmode. */
#ifdef STRICT_ALIGNMENT
&& (TYPE_ALIGN (type) >= BIGGEST_ALIGNMENT
|| TYPE_ALIGN (type) >= TREE_INT_CST_LOW (TYPE_SIZE (type)))
#endif
)
&& (! STRICT_ALIGNMENT
|| TYPE_ALIGN (type) >= BIGGEST_ALIGNMENT
|| TYPE_ALIGN (type) >= TREE_INT_CST_LOW (TYPE_SIZE (type))))
{
tree field;
/* A union which has any BLKmode members must itself be BLKmode;
@ -809,11 +811,9 @@ layout_type (type)
alignment. */
if (TYPE_MODE (type) != BLKmode && TYPE_MODE (type) != VOIDmode
#ifndef STRICT_ALIGNMENT
&& (TREE_CODE (type) != RECORD_TYPE && TREE_CODE (type) != UNION_TYPE
&& TREE_CODE (type) != ARRAY_TYPE)
#endif
)
&& (STRICT_ALIGNMENT
|| (TREE_CODE (type) != RECORD_TYPE && TREE_CODE (type) != UNION_TYPE
&& TREE_CODE (type) != ARRAY_TYPE)))
TYPE_ALIGN (type) = GET_MODE_ALIGNMENT (TYPE_MODE (type));
/* Evaluate nonconstant size only once, either now or as soon as safe. */
@ -971,7 +971,7 @@ get_best_mode (bitsize, bitpos, align, largest_mode, volatilep)
if (mode == MAX_MACHINE_MODE
/* It is tempting to omit the following line
if STRICT_ALIGNMENT is not defined.
if STRICT_ALIGNMENT is true.
But that is incorrect, since if the bitfield uses part of 3 bytes
and we use a 4-byte mode, we could get a spurious segv
if the extra 4th byte is past the end of memory.