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re PR tree-optimization/49618 (When building uClibc with GCC 4.6.1 old_atexit is miscompiled)

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PR tree-optimization/49618
	* tree-eh.c (tree_could_trap_p) <case CALL_EXPR>: For DECL_WEAK
	t recurse on the decl.
	<case FUNCTION_DECL, case VAR_DECL>: For DECL_WEAK decls
	return true if expr isn't known to be defined in current
	TU or some other LTO partition.

From-SVN: r175884
This commit is contained in:
Jakub Jelinek 2011-07-05 20:43:04 +02:00 • committed by Jakub Jelinek
parent 49bf9170eb
commit f2c3a8ce9c
2 changed files with 44 additions and 1 deletions
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9
gcc/ChangeLog
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@ -1,3 +1,12 @@
2011-07-05 Jakub Jelinek <jakub@redhat.com>
PR tree-optimization/49618
* tree-eh.c (tree_could_trap_p) <case CALL_EXPR>: For DECL_WEAK
t recurse on the decl.
<case FUNCTION_DECL, case VAR_DECL>: For DECL_WEAK decls
return true if expr isn't known to be defined in current
TU or some other LTO partition.
2011-07-05 Michael Meissner <meissner@linux.vnet.ibm.com>
* params.def (PARAM_CASE_VALUES_THRESHOLD): New parameter to

36
gcc/tree-eh.c
View file

@ -2449,8 +2449,42 @@ tree_could_trap_p (tree expr)
case CALL_EXPR:
t = get_callee_fndecl (expr);
/* Assume that calls to weak functions may trap. */
if (!t || !DECL_P (t) || DECL_WEAK (t))
if (!t || !DECL_P (t))
return true;
if (DECL_WEAK (t))
return tree_could_trap_p (t);
return false;
case FUNCTION_DECL:
/* Assume that accesses to weak functions may trap, unless we know
they are certainly defined in current TU or in some other
LTO partition. */
if (DECL_WEAK (expr))
{
struct cgraph_node *node;
if (!DECL_EXTERNAL (expr))
return false;
node = cgraph_function_node (cgraph_get_node (expr), NULL);
if (node && node->in_other_partition)
return false;
return true;
}
return false;
case VAR_DECL:
/* Assume that accesses to weak vars may trap, unless we know
they are certainly defined in current TU or in some other
LTO partition. */
if (DECL_WEAK (expr))
{
struct varpool_node *node;
if (!DECL_EXTERNAL (expr))
return false;
node = varpool_variable_node (varpool_get_node (expr), NULL);
if (node && node->in_other_partition)
return false;
return true;
}
return false;
default: