Introduce vNULL to use as a nil initializer for vec<>.

This patch implements Jakub's idea of adding an empty struct with
a typecast operator that returns nil vectors.  This is useful to
shorten all the initializers when declaring vec instances or passing
nil vectors as function arguments.

2012-11-20  Diego Novillo  <dnovillo@google.com>
	    Jakub Jelinek  <jakub@redhat.com>

ChangeLog
	* vec.h (struct vnull): Declare.
	(vNULL): Declare.
	* vec.c (vNULL): Define.
	* bb-reorder.c: Replace all vec<T, A>() initializers with vNULL.
	* cfgexpand.c: Likewise.
	* cfgloop.c: Likewise.
	* cfgloopanal.c: Likewise.
	* cfgloopmanip.c: Likewise.
	* cgraph.c: Likewise.
	* config/c6x/c6x.c: Likewise.
	* config/i386/i386.c: Likewise.
	* df-core.c: Likewise.
	* dominance.c: Likewise.
	* dwarf2out.c: Likewise.
	* except.c: Likewise.
	* function.c: Likewise.
	* gcse.c: Likewise.
	* genautomata.c: Likewise.
	* graphds.c: Likewise.
	* graphite-scop-detection.c: Likewise.
	* graphite.c: Likewise.
	* haifa-sched.c: Likewise.
	* ifcvt.c: Likewise.
	* ipa-cp.c: Likewise.
	* ipa-inline-analysis.c: Likewise.
	* ipa-inline-transform.c: Likewise.
	* ipa-inline.c: Likewise.
	* ipa-prop.c: Likewise.
	* ipa-split.c: Likewise.
	* ipa-utils.c: Likewise.
	* ira-build.c: Likewise.
	* lto-cgraph.c: Likewise.
	* lto-streamer-in.c: Likewise.
	* lto-symtab.c: Likewise.
	* opts-global.c: Likewise.
	* passes.c: Likewise.
	* ree.c: Likewise.
	* sched-deps.c: Likewise.
	* sel-sched-ir.c: Likewise.
	* sel-sched-ir.h: Likewise.
	* sel-sched.c: Likewise.
	* stor-layout.c: Likewise.
	* trans-mem.c: Likewise.
	* tree-call-cdce.c: Likewise.
	* tree-cfg.c: Likewise.
	* tree-data-ref.c: Likewise.
	* tree-diagnostic.c: Likewise.
	* tree-eh.c: Likewise.
	* tree-loop-distribution.c: Likewise.
	* tree-predcom.c: Likewise.
	* tree-ssa-loop-im.c: Likewise.
	* tree-ssa-loop-ivcanon.c: Likewise.
	* tree-ssa-loop-manip.c: Likewise.
	* tree-ssa-loop-niter.c: Likewise.
	* tree-ssa-loop-prefetch.c: Likewise.
	* tree-ssa-math-opts.c: Likewise.
	* tree-ssa-phiopt.c: Likewise.
	* tree-ssa-pre.c: Likewise.
	* tree-ssa-propagate.c: Likewise.
	* tree-ssa-reassoc.c: Likewise.
	* tree-ssa-sccvn.c: Likewise.
	* tree-ssa-structalias.c: Likewise.
	* tree-ssa-threadedge.c: Likewise.
	* tree-ssa-uninit.c: Likewise.
	* tree-stdarg.c: Likewise.
	* tree-switch-conversion.c: Likewise.
	* tree-vect-data-refs.c: Likewise.
	* tree-vect-loop.c: Likewise.
	* tree-vect-slp.c: Likewise.
	* tree-vect-stmts.c: Likewise.
	* value-prof.c: Likewise.
	* varasm.c: Likewise.

ada/ChangeLog
	* gcc-interface/decl.c: Replace all vec<T,A>()
	initializers with vNULL.

cp/ChangeLog
	* name-lookup.c: Replace all vec<T, A>() initializers
	with vNULL.
	* semantics.c: Likewise.

fortran/ChangeLog
	* trans-openmp.c: Replace all vec<T, A>() initializers
	with vNULL.

lto/ChangeLog
	* lto.c: Replace all vec<T, A>() initializers with vNULL.

objc/ChangeLog
	* objc-act.c: Replace all vec<T, A>() initializers with vNULL.

git-svn-id: https://gcc.gnu.org/svn/gcc/trunk@193677 138bc75d-0d04-0410-961f-82ee72b054a4

2 files changed, 8 insertions, 3 deletions

diff --git a/gcc/lto/ChangeLog b/gcc/lto/ChangeLog
index 841d2500561..9e0de2a0691 100644
--- a/gcc/lto/ChangeLog
+++ b/gcc/lto/ChangeLog
@@ -1,3 +1,8 @@
+2012-11-20  Diego Novillo  <dnovillo@google.com>
+	    Jakub Jelinek  <jakub@redhat.com>
+
+	* lto.c: Replace all vec<T, A>() initializers with vNULL.
+
 2012-11-16  Diego Novillo  <dnovillo@google.com>
 
 	Adjust for new vec API (http://gcc.gnu.org/wiki/cxx-conversion/cxx-vec)
diff --git a/gcc/lto/lto.c b/gcc/lto/lto.c
index da55b7efbbe..376af85a704 100644
--- a/gcc/lto/lto.c
+++ b/gcc/lto/lto.c
@@ -873,7 +873,7 @@ pop:
 static bool
 gimple_types_compatible_p (tree t1, tree t2)
 {
-  vec<type_pair_t> sccstack = vec<type_pair_t>();
+  vec<type_pair_t> sccstack = vNULL;
   struct pointer_map_t *sccstate;
   struct obstack sccstate_obstack;
   type_pair_t p = NULL;
@@ -1298,7 +1298,7 @@ static hashval_t
 gimple_type_hash (const void *p)
 {
   const_tree t = (const_tree) p;
-  vec<tree> sccstack = vec<tree>();
+  vec<tree> sccstack = vNULL;
   struct pointer_map_t *sccstate;
   struct obstack sccstate_obstack;
   hashval_t val;
@@ -2318,7 +2318,7 @@ lto_file_finalize (struct lto_file_decl_data *file_data, lto_file *file)
   const char *data;
   size_t len;
   vec<ld_plugin_symbol_resolution_t>
-	resolutions = vec<ld_plugin_symbol_resolution_t>();
+	resolutions = vNULL;
   int i;
   res_pair *rp;