From 47598145be96f39a73809240153e5af12bfbcedd Mon Sep 17 00:00:00 2001
From: Michael Matz <matz@suse.de>
Date: Tue, 8 Nov 2011 16:47:16 +0000
Subject: gengtype.c (write_field_root): Avoid out-of-scope access of newv.

	* gengtype.c (write_field_root): Avoid out-of-scope access of newv.

	* tree-stdarg.c (execute_optimize_stdarg): Accept clobbers.

	* tree.h (TREE_CLOBBER_P): New macro.
	* gimple.h (gimple_clobber_p): New inline function.
	* gimplify.c (gimplify_bind_expr): Add clobbers for all variables
	that go out of scope and live in memory.
	* tree-ssa-operands.c (get_expr_operands): Transfer volatility also
	for constructors.
	* cfgexpand.c (decl_to_stack_part): New static variable.
	(add_stack_var): Allocate it, and remember mapping.
	(fini_vars_expansion): Deallocate it.
	(stack_var_conflict_p): Add early outs.
	(visit_op, visit_conflict, add_scope_conflicts_1,
	add_scope_conflicts): New static functions.
	(expand_used_vars_for_block): Don't call add_stack_var_conflict, tidy.
	(expand_used_vars): Add scope conflicts.
	(expand_gimple_stmt_1): Expand clobbers to nothing.
	(expand_debug_expr): Ditto.

	* tree-pretty-print.c (dump_generic_node): Dump clobbers nicely.
	* tree-ssa-live.c (remove_unused_locals): Remove clobbers that
	refer to otherwise unused locals.
	* tree-sra.c (build_accesses_from_assign): Ignore clobbers.
	* tree-ssa-dce.c (mark_stmt_if_obviously_necessary): Clobbers of
	SSA names aren't necessary.
	(propagate_necessity): Accept and ignore constructors on the rhs,
	tidy.
	* gimple.c (walk_gimple_op): Accept constructors like mem_rhs.
	* tree-ssa-structalias.c (find_func_aliases): Clobbers don't store
	any known value.
	* tree-ssa-sccvn.c (vn_reference_lookup_3): Ditto, in particular they
	don't zero-initialize something.
	* tree-ssa-phiopt.c (cond_if_else_store_replacement_1): Ignore
	clobber RHS, we don't want PHI nodes with those.

testsuite/
	* gcc.dg/tree-ssa/20031015-1.c: Adjust.
	* g++.dg/tree-ssa/ehcleanup-1.C: Ditto.
	* g++.dg/eh/builtin1.C: Rewrite to not use local variables.
	* g++.dg/eh/builtin2.C: Ditto.
	* g++.dg/eh/builtin3.C: Ditto.

From-SVN: r181172
---
 gcc/gimple.h | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'gcc/gimple.h')

diff --git a/gcc/gimple.h b/gcc/gimple.h
index ffecc26..8536c70 100644
--- a/gcc/gimple.h
+++ b/gcc/gimple.h
@@ -2053,6 +2053,14 @@ gimple_assign_cast_p (gimple s)
   return false;
 }
 
+/* Return true if S is a clobber statement.  */
+
+static inline bool
+gimple_clobber_p (gimple s)
+{
+  return gimple_assign_single_p (s)
+         && TREE_CLOBBER_P (gimple_assign_rhs1 (s));
+}
 
 /* Return true if GS is a GIMPLE_CALL.  */
 
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