This patch rewrites the old VEC macro-based interface into a new one based on the template class 'vec'.

This patch rewrites the old VEC macro-based interface into a new one
based on the template class 'vec'.  The user-visible changes are
described in http://gcc.gnu.org/wiki/cxx-conversion/cxx-vec.

I have tested the patch pretty extensively:

- Regular bootstraps on x86_64, ppc, ia64, sparc and hppa.
- Bootstraps with --enable-checking=release
- Bootstraps with --enable-checking=gc,gcac
- Basic builds on all targets (using contrib/config-list.mk).

We no longer access the vectors via VEC_* macros.  The pattern is
"VEC_operation (T, A, V, args)" becomes "V.operation (args)".

The only thing I could not do is create proper ctors and dtors for the
vec class.  Since these vectors are stored in unions, we
have to keep them as PODs (C++03 does not allow non-PODs in unions).

This means that creation and destruction must be explicit.  There is a
new method vec<type, allocation, layout>::create() and another vec<type,
allocation, layout>::destroy() to allocate the internal vector.

For vectors that must be pointers, there is a family of free functions
that implement the operations that need to tolerate NULL vectors.
These functions all start with the prefix 'vec_safe_'.  See the wiki
page for details.

The gengtype change removes the special handling for VEC() that used
to exist in gengtype. Additionally, it allows gengtype to recognize
templates of more than one argument and introduces the concept of an
undefined type (useful for template arguments that may or may not be
types).

When a TYPE_UNDEFINED is reached, gengtype will ignore it if it
happens inside a type marked with GTY((user)).  Otherwise, it will
emit an error.

Finally, gengtype rejects root types marked GTY((user)) that are not
first class pointers.

2012-11-16  Diego Novillo  <dnovillo@google.com>

	VEC API overhaul (http://gcc.gnu.org/wiki/cxx-conversion/cxx-vec)

	* vec.c (register_overhead): Convert it into
	member function of vec_prefix.
	(release_overhead): Likewise.
	(calculate_allocation): Likewise.
	(vec_heap_free): Remove.
	(vec_gc_o_reserve_1): Remove.
	(vec_heap_o_reserve_1): Remove.
	(vec_stack_o_reserve_1): Remove.
	(vec_stack_o_reserve_exact): Remove.
	(register_stack_vec): New.
	(stack_vec_register_index): New.
	(unregister_stack_vec): New.
	(vec_assert_fail): Remove.
	* vec.h: Conditionally include ggc.h.  Document conditional
	hackery.
	Update top-level documentation.
	(ALONE_VEC_CHECK_INFO): Remove.
	(VEC_CHECK_INFO): Remove.
	(ALONE_VEC_CHECK_DECL): Remove.
	(VEC_CHECK_DECL): Remove.
	(ALONE_VEC_CHECK_PASS): Remove.
	(VEC_CHECK_PASS): Remove.
	(VEC_ASSERT): Remove.
	(vec_prefix): Add friends va_gc, va_gc_atomic, va_heap and
	va_stack.
	Mark fields alloc_ and num_ as protected.
	(struct vec_t): Remove.  Remove all function members.
	(struct vl_embed): Declare.
	(struct vl_ptr): Declare.
	(free): Remove.
	(reserve_exact): Remove.
	(reserve): Remove.
	(safe_splice): Remove.
	(safe_push): Remove.
	(safe_grow): Remove.
	(safe_grow_cleared): Remove.
	(safe_insert): Remove.
	(DEF_VEC_I): Remove.
	(DEF_VEC_ALLOC_I): Remove.
	(DEF_VEC_P): Remove.
	(DEF_VEC_ALLOC_P): Remove.
	(DEF_VEC_O): Remove.
	(DEF_VEC_ALLOC_O): Remove.
	(DEF_VEC_ALLOC_P_STACK): Remove.
	(DEF_VEC_ALLOC_O_STACK): Remove.
	(DEF_VEC_ALLOC_I_STACK): Remove.
	(DEF_VEC_A): Remove.
	(DEF_VEC_ALLOC_A): Remove.
	(vec_stack_p_reserve_exact_1): Remove.
	(vec_stack_o_reserve): Remove.
	(vec_stack_o_reserve_exact): Remove.
	(VEC_length): Remove.
	(VEC_empty): Remove.
	(VEC_address): Remove.
	(vec_address): Remove.
	(VEC_last): Remove.
	(VEC_index): Remove.
	(VEC_iterate): Remove.
	(VEC_embedded_size): Remove.
	(VEC_embedded_init): Remove.
	(VEC_free): Remove.
	(VEC_copy): Remove.
	(VEC_space): Remove.
	(VEC_reserve): Remove.
	(VEC_reserve_exact): Remove.
	(VEC_splice): Remove.
	(VEC_safe_splice): Remove.
	(VEC_quick_push): Remove.
	(VEC_safe_push): Remove.
	(VEC_pop): Remove.
	(VEC_truncate): Remove.
	(VEC_safe_grow): Remove.
	(VEC_replace): Remove.
	(VEC_quick_insert): Remove.
	(VEC_safe_insert): Remove.
	(VEC_ordered_remove): Remove.
	(VEC_unordered_remove): Remove.
	(VEC_block_remove): Remove.
	(VEC_lower_bound): Remove.
	(VEC_alloc): Remove.
	(VEC_qsort): Remove.

	(va_heap): Declare.
	(va_heap::default_layout): New typedef to vl_ptr.
	(va_heap::reserve): New.
	(va_heap::release): New.
	(va_gc): Declare.
	(va_gc::default_layout): New typedef to vl_embed.
	(va_gc::reserve): New.
	(va_gc::release): New.
	(va_gc_atomic): Declare.  Inherit from va_gc.
	(va_stack): Declare.
	(va_stack::default_layout): New typedef to vl_ptr.
	(va_stack::alloc): New.
	(va_stack::reserve): New.
	(va_stack::release): New.
	(register_stack_vec): Declare.
	(stack_vec_register_index): Declare.
	(unregister_stack_vec): Declare.

	(vec<T, A = va_heap, L = typename A::default_layout>): Declare
	empty vec template.
	(vec<T, A, vl_embed>): Partial specialization for embedded
	layout.
	(vec<T, A, vl_embed>::allocated): New.
	(vec<T, A, vl_embed>::length): New.
	(vec<T, A, vl_embed>::is_empty): New.
	(vec<T, A, vl_embed>::address): New.
	(vec<T, A, vl_embed>::operator[]): New.
	(vec<T, A, vl_embed>::last New.
	(vec<T, A, vl_embed>::space): New.
	(vec<T, A, vl_embed>::iterate): New.
	(vec<T, A, vl_embed>::iterate): New.
	(vec<T, A, vl_embed>::copy): New.
	(vec<T, A, vl_embed>::splice): New.
	(vec<T, A, vl_embed>::quick_push New.
	(vec<T, A, vl_embed>::pop New.
	(vec<T, A, vl_embed>::truncate): New.
	(vec<T, A, vl_embed>::quick_insert): New.
	(vec<T, A, vl_embed>::ordered_remove): New.
	(vec<T, A, vl_embed>::unordered_remove): New.
	(vec<T, A, vl_embed>::block_remove): New.
	(vec<T, A, vl_embed>::qsort): New.
	(vec<T, A, vl_embed>::lower_bound): New.
	(vec<T, A, vl_embed>::embedded_size): New.
	(vec<T, A, vl_embed>::embedded_init): New.
	(vec<T, A, vl_embed>::quick_grow): New.
	(vec<T, A, vl_embed>::quick_grow_cleared): New.
	(vec_safe_space): New.
	(vec_safe_length): New.
	(vec_safe_address): New.
	(vec_safe_is_empty): New.
	(vec_safe_reserve): New.
	(vec_safe_reserve_exact): New.
	(vec_alloc): New.
	(vec_free): New.
	(vec_safe_grow): New.
	(vec_safe_grow_cleared): New.
	(vec_safe_iterate): New.
	(vec_safe_push): New.
	(vec_safe_insert): New.
	(vec_safe_truncate): New.
	(vec_safe_copy): New.
	(vec_safe_splice): New.

	(vec<T, A, vl_ptr>): New partial specialization for the space
	efficient layout.
	(vec<T, A, vl_ptr>::exists): New.
	(vec<T, A, vl_ptr>::is_empty): New.
	(vec<T, A, vl_ptr>::length): New.
	(vec<T, A, vl_ptr>::address): New.
	(vec<T, A, vl_ptr>::operator[]): New.
	(vec<T, A, vl_ptr>::operator!=): New.
	(vec<T, A, vl_ptr>::operator==): New.
	(vec<T, A, vl_ptr>::last): New.
	(vec<T, A, vl_ptr>::space): New.
	(vec<T, A, vl_ptr>::iterate): New.
	(vec<T, A, vl_ptr>::copy): New.
	(vec<T, A, vl_ptr>::reserve): New.
	(vec<T, A, vl_ptr>::reserve_exact): New.
	(vec<T, A, vl_ptr>::splice): New.
	(vec<T, A, vl_ptr>::safe_splice): New.
	(vec<T, A, vl_ptr>::quick_push): New.
	(vec<T, A, vl_ptr>::safe_push): New.
	(vec<T, A, vl_ptr>::pop): New.
	(vec<T, A, vl_ptr>::truncate): New.
	(vec<T, A, vl_ptr>::safe_grow): New.
	(vec<T, A, vl_ptr>::safe_grow_cleared): New.
	(vec<T, A, vl_ptr>::quick_grow): New.
	(vec<T, A, vl_ptr>::quick_grow_cleared): New.
	(vec<T, A, vl_ptr>::quick_insert): New.
	(vec<T, A, vl_ptr>::safe_insert): New.
	(vec<T, A, vl_ptr>::ordered_remove): New.
	(vec<T, A, vl_ptr>::unordered_remove): New.
	(vec<T, A, vl_ptr>::block_remove): New.
	(vec<T, A, vl_ptr>::qsort): New.
	(vec<T, A, vl_ptr>::lower_bound): New.
	(vec_stack_alloc): Define.
	(FOR_EACH_VEC_SAFE_ELT): Define.
	* vecir.h: Remove.  Update all users.
	* vecprim.h: Remove.  Update all users.
	Move uchar to coretypes.h.

	* Makefile.in (VEC_H): Add $(GGC_H).
	Remove vecir.h and vecprim.h dependencies everywhere.

2012-11-16  Diego Novillo  <dnovillo@google.com>

	* gengtype-lex.l (VEC): Remove.
	Add characters in the set [\!\>\.-].
	* gengtype-parse.c (token_names): Remove "VEC".
	(require_template_declaration): Remove handling of VEC_TOKEN.
	(type): Likewise.
	Call create_user_defined_type when parsing GTY((user)).
	* gengtype-state.c (type_lineloc): handle TYPE_UNDEFINED.
	(write_state_undefined_type): New.
	(write_state_type): Call write_state_undefined_type for
	TYPE_UNDEFINED.
	(read_state_type): Call read_state_undefined_type for
	TYPE_UNDEFINED.
	* gengtype.c (dbgprint_count_type_at): Handle TYPE_UNDEFINED.
	(create_user_defined_type): Make extern.
	(type_for_name): Factor out of resolve_typedef.
	(create_undefined_type): New
	(resolve_typedef): Call it when we cannot find a previous
	typedef and the type is not a template.
	(find_structure): Accept TYPE_UNDEFINED.
	(set_gc_used_type): Add argument ALLOWED_UNDEFINED_TYPES,
	default to false.
	Emit an error for TYPE_UNDEFINED unless LEVEL is GC_UNUSED or
	ALLOWED_UNDEFINED_TYPES is set.
	Set ALLOWED_UNDEFINED_TYPES to true for TYPE_USER_STRUCT.
	(filter_type_name): Accept templates with more than one
	argument.
	(output_mangled_typename): Handle TYPE_UNDEFINED
	(walk_type): Likewise.
	(write_types_process_field): Likewise.
	(write_func_for_structure): If CHAIN_NEXT is set, ORIG_S
	should not be a user-defined type.
	(write_types_local_user_process_field): Handle TYPE_ARRAY,
	TYPE_NONE and TYPE_UNDEFINED.
	(write_types_local_process_field): Likewise.
	(contains_scalar_p): Return 0 for TYPE_USER_STRUCT.
	(write_root): Reject user-defined types that are not pointers.
	Handle TYPE_NONE, TYPE_UNDEFINED, TYPE_UNION, TYPE_LANG_STRUCT
	and TYPE_PARAM_STRUCT.
	(output_typename): Handle TYPE_NONE, TYPE_UNDEFINED, and
	TYPE_ARRAY.
	(dump_typekind): Handle TYPE_UNDEFINED.
	* gengtype.h (enum typekind): Add TYPE_UNDEFINED.
	(create_user_defined_type): Declare.
	(enum gty_token): Remove VEC_TOKEN.

2012-11-16  Diego Novillo  <dnovillo@google.com>

	Adjust for new vec API (http://gcc.gnu.org/wiki/cxx-conversion/cxx-vec)

	* coretypes.h (uchar): Define.
	* alias.c: Use new vec API in vec.h.
	* asan.c: Likewise.
	* attribs.c: Likewise.
	* basic-block.h: Likewise.
	* bb-reorder.c: Likewise.
	* builtins.c: Likewise.
	* calls.c: Likewise.
	* cfg.c: Likewise.
	* cfganal.c: Likewise.
	* cfgcleanup.c: Likewise.
	* cfgexpand.c: Likewise.
	* cfghooks.c: Likewise.
	* cfghooks.h: Likewise.
	* cfgloop.c: Likewise.
	* cfgloop.h: Likewise.
	* cfgloopanal.c: Likewise.
	* cfgloopmanip.c: Likewise.
	* cfgrtl.c: Likewise.
	* cgraph.c: Likewise.
	* cgraph.h: Likewise.
	* cgraphclones.c: Likewise.
	* cgraphunit.c: Likewise.
	* combine.c: Likewise.
	* compare-elim.c: Likewise.
	* coverage.c: Likewise.
	* cprop.c: Likewise.
	* data-streamer.h: Likewise.
	* dbxout.c: Likewise.
	* dce.c: Likewise.
	* df-core.c: Likewise.
	* df-problems.c: Likewise.
	* df-scan.c: Likewise.
	* dominance.c: Likewise.
	* domwalk.c: Likewise.
	* domwalk.h: Likewise.
	* dse.c: Likewise.
	* dwarf2cfi.c: Likewise.
	* dwarf2out.c: Likewise.
	* dwarf2out.h: Likewise.
	* emit-rtl.c: Likewise.
	* except.c: Likewise.
	* except.h: Likewise.
	* expr.c: Likewise.
	* expr.h: Likewise.
	* final.c: Likewise.
	* fold-const.c: Likewise.
	* function.c: Likewise.
	* function.h: Likewise.
	* fwprop.c: Likewise.
	* gcc.c: Likewise.
	* gcse.c: Likewise.
	* genattr.c: Likewise.
	* genattrtab.c: Likewise.
	* genautomata.c: Likewise.
	* genextract.c: Likewise.
	* genopinit.c: Likewise
	* ggc-common.c: Likewise.
	* ggc.h: Likewise.
	* gimple-low.c: Likewise.
	* gimple-ssa-strength-reduction.c: Likewise.
	* gimple-streamer-in.c: Likewise.
	* gimple.c: Likewise.
	* gimple.h: Likewise.
	* gimplify.c: Likewise.
	* graph.c: Likewise.
	* graphds.c: Likewise.
	* graphds.h: Likewise.
	* graphite-blocking.c: Likewise.
	* graphite-clast-to-gimple.c: Likewise.
	* graphite-dependences.c: Likewise.
	* graphite-interchange.c: Likewise.
	* graphite-optimize-isl.c: Likewise.
	* graphite-poly.c: Likewise.
	* graphite-poly.h: Likewise.
	* graphite-scop-detection.c: Likewise.
	* graphite-scop-detection.h: Likewise.
	* graphite-sese-to-poly.c: Likewise.
	* graphite.c: Likewise.
	* godump.c: Likewise.
	* haifa-sched.c: Likewise.
	* hw-doloop.c: Likewise.
	* hw-doloop.h: Likewise.
	* ifcvt.c: Likewise.
	* insn-addr.h: Likewise.
	* ipa-cp.c: Likewise.
	* ipa-inline-analysis.c: Likewise.
	* ipa-inline-transform.c: Likewise.
	* ipa-inline.c: Likewise.
	* ipa-inline.h: Likewise.
	* ipa-prop.c: Likewise.
	* ipa-prop.h: Likewise.
	* ipa-pure-const.c: Likewise.
	* ipa-ref-inline.h: Likewise.
	* ipa-ref.c: Likewise.
	* ipa-ref.h: Likewise.
	* ipa-reference.c: Likewise.
	* ipa-split.c: Likewise.
	* ipa-utils.c: Likewise.
	* ipa-utils.h: Likewise.
	* ipa.c: Likewise.
	* ira-build.c: Likewise.
	* ira-color.c: Likewise.
	* ira-emit.c: Likewise.
	* ira-int.h: Likewise.
	* ira.c: Likewise.
	* loop-invariant.c: Likewise.
	* loop-unroll.c: Likewise.
	* lower-subreg.c: Likewise.
	* lra-lives.c: Likewise.
	* lra.c: Likewise.
	* lto-cgraph.c: Likewise.
	* lto-section-out.c: Likewise.
	* lto-streamer-in.c: Likewise.
	* lto-streamer-out.c: Likewise.
	* lto-streamer.h: Likewise.
	* lto-symtab.c: Likewise.
	* mcf.c: Likewise.
	* modulo-sched.c: Likewise.
	* omp-low.c: Likewise.
	* opts-common.c: Likewise.
	* opts-global.c: Likewise.
	* opts.c: Likewise.
	* opts.h: Likewise.
	* passes.c: Likewise.
	* predict.c: Likewise.
	* print-tree.c: Likewise.
	* profile.c: Likewise.
	* profile.h: Likewise.
	* read-rtl.c: Likewise.
	* ree.c: Likewise.
	* reg-stack.c: Likewise.
	* regrename.c: Likewise.
	* regrename.h: Likewise.
	* reload.c: Likewise.
	* reload.h: Likewise.
	* reload1.c: Likewise.
	* rtl.h: Likewise.
	* sched-deps.c: Likewise.
	* sched-int.h: Likewise.
	* sdbout.c: Likewise.
	* sel-sched-dump.c: Likewise.
	* sel-sched-ir.c: Likewise.
	* sel-sched-ir.h: Likewise.
	* sel-sched.c: Likewise.
	* sese.c: Likewise.
	* sese.h: Likewise.
	* statistics.h: Likewise.
	* stmt.c: Likewise.
	* stor-layout.c: Likewise.
	* store-motion.c: Likewise.
	* tlink.c: Likewise.
	* toplev.c: Likewise.
	* trans-mem.c: Likewise.
	* tree-browser.c: Likewise.
	* tree-call-cdce.c: Likewise.
	* tree-cfg.c: Likewise.
	* tree-cfgcleanup.c: Likewise.
	* tree-chrec.c: Likewise.
	* tree-chrec.h: Likewise.
	* tree-complex.c: Likewise.
	* tree-data-ref.c: Likewise.
	* tree-data-ref.h: Likewise.
	* tree-dfa.c: Likewise.
	* tree-diagnostic.c: Likewise.
	* tree-dump.c: Likewise.
	* tree-eh.c: Likewise.
	* tree-emutls.c: Likewise.
	* tree-flow.h: Likewise.
	* tree-if-conv.c: Likewise.
	* tree-inline.c: Likewise.
	* tree-inline.h: Likewise.
	* tree-into-ssa.c: Likewise.
	* tree-iterator.c: Likewise.
	* tree-loop-distribution.c: Likewise.
	* tree-mudflap.c: Likewise.
	* tree-optimize.c: Likewise.
	* tree-outof-ssa.c: Likewise.
	* tree-parloops.c: Likewise.
	* tree-phinodes.c: Likewise.
	* tree-predcom.c: Likewise.
	* tree-pretty-print.c: Likewise.
	* tree-scalar-evolution.c: Likewise.
	* tree-sra.c: Likewise.
	* tree-ssa-address.c: Likewise.
	* tree-ssa-alias.c: Likewise.
	* tree-ssa-ccp.c: Likewise.
	* tree-ssa-coalesce.c: Likewise.
	* tree-ssa-dce.c: Likewise.
	* tree-ssa-dom.c: Likewise.
	* tree-ssa-forwprop.c: Likewise.
	* tree-ssa-live.c: Likewise.
	* tree-ssa-live.h: Likewise.
	* tree-ssa-loop-im.c: Likewise.
	* tree-ssa-loop-ivcanon.c: Likewise.
	* tree-ssa-loop-ivopts.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-operands.c: Likewise.
	* tree-ssa-phiopt.c: Likewise.
	* tree-ssa-phiprop.c: Likewise.
	* tree-ssa-pre.c: Likewise.
	* tree-ssa-propagate.c: Likewise.
	* tree-ssa-reassoc.c: Likewise.
	* tree-ssa-sccvn.c: Likewise.
	* tree-ssa-sccvn.h: Likewise.
	* tree-ssa-strlen.c: Likewise.
	* tree-ssa-structalias.c: Likewise.
	* tree-ssa-tail-merge.c: Likewise.
	* tree-ssa-threadedge.c: Likewise.
	* tree-ssa-threadupdate.c: Likewise.
	* tree-ssa-uncprop.c: Likewise.
	* tree-ssa-uninit.c: Likewise.
	* tree-ssa.c: Likewise.
	* tree-ssanames.c: Likewise.
	* tree-stdarg.c: Likewise.
	* tree-streamer-in.c: Likewise.
	* tree-streamer-out.c: Likewise.
	* tree-streamer.c: Likewise.
	* tree-streamer.h: Likewise.
	* tree-switch-conversion.c: Likewise.
	* tree-vect-data-refs.c: Likewise.
	* tree-vect-generic.c: Likewise.
	* tree-vect-loop-manip.c: Likewise.
	* tree-vect-loop.c: Likewise.
	* tree-vect-patterns.c: Likewise.
	* tree-vect-slp.c: Likewise.
	* tree-vect-stmts.c: Likewise.
	* tree-vectorizer.c: Likewise.
	* tree-vectorizer.h: Likewise.
	* tree-vrp.c: Likewise.
	* tree.c: Likewise.
	* tree.h: Likewise.
	* value-prof.c: Likewise.
	* value-prof.h: Likewise.
	* var-tracking.c: Likewise.
	* varasm.c: Likewise.
	* varpool.c: Likewise.
	* vmsdbgout.c: Likewise.
	* config/bfin/bfin.c: Likewise.
	* config/c6x/c6x.c: Likewise.
	* config/darwin.c: Likewise.
	* config/i386/i386.c: Likewise.
	* config/ia64/ia64.c: Likewise.
	* config/mep/mep.c: Likewise.
	* config/mips/mips.c: Likewise.
	* config/pa/pa.c: Likewise.
	* config/rs6000/rs6000-c.c: Likewise.
	* config/rs6000/rs6000.c: Likewise.
	* config/rx/rx.c: Likewise.
	* config/spu/spu-c.c: Likewise.
	* config/vms/vms.c: Likewise.
	* config/vxworks.c: Likewise.
	* config/epiphany/resolve-sw-modes.c: Likewise.

From-SVN: r193595

1 files changed, 40 insertions, 44 deletions

diff --git a/gcc/ipa-split.c b/gcc/ipa-split.c
index 440b3f9..ceed8d2 100644
--- a/gcc/ipa-split.c
+++ b/gcc/ipa-split.c
@@ -99,10 +99,8 @@ typedef struct
   unsigned int size;
   unsigned int time;
 } bb_info;
-DEF_VEC_O(bb_info);
-DEF_VEC_ALLOC_O(bb_info,heap);
 
-static VEC(bb_info, heap) *bb_info_vec;
+static vec<bb_info> bb_info_vec;
 
 /* Description of split point.  */
 
@@ -192,7 +190,7 @@ verify_non_ssa_vars (struct split_point *current, bitmap non_ssa_vars,
 		     basic_block return_bb)
 {
   bitmap seen = BITMAP_ALLOC (NULL);
-  VEC (basic_block,heap) *worklist = NULL;
+  vec<basic_block> worklist = vec<basic_block>();
   edge e;
   edge_iterator ei;
   bool ok = true;
@@ -201,14 +199,14 @@ verify_non_ssa_vars (struct split_point *current, bitmap non_ssa_vars,
     if (e->src != ENTRY_BLOCK_PTR
 	&& !bitmap_bit_p (current->split_bbs, e->src->index))
       {
-        VEC_safe_push (basic_block, heap, worklist, e->src);
+        worklist.safe_push (e->src);
 	bitmap_set_bit (seen, e->src->index);
       }
 
-  while (!VEC_empty (basic_block, worklist))
+  while (!worklist.is_empty ())
     {
       gimple_stmt_iterator bsi;
-      basic_block bb = VEC_pop (basic_block, worklist);
+      basic_block bb = worklist.pop ();
 
       FOR_EACH_EDGE (e, ei, bb->preds)
 	if (e->src != ENTRY_BLOCK_PTR
@@ -216,7 +214,7 @@ verify_non_ssa_vars (struct split_point *current, bitmap non_ssa_vars,
 	  {
 	    gcc_checking_assert (!bitmap_bit_p (current->split_bbs,
 					        e->src->index));
-	    VEC_safe_push (basic_block, heap, worklist, e->src);
+	    worklist.safe_push (e->src);
 	  }
       for (bsi = gsi_start_bb (bb); !gsi_end_p (bsi); gsi_next (&bsi))
 	{
@@ -271,7 +269,7 @@ verify_non_ssa_vars (struct split_point *current, bitmap non_ssa_vars,
     }
 done:
   BITMAP_FREE (seen);
-  VEC_free (basic_block, heap, worklist);
+  worklist.release ();
   return ok;
 }
 
@@ -868,8 +866,6 @@ typedef struct
   /* When false we can not split on this BB.  */
   bool can_split;
 } stack_entry;
-DEF_VEC_O(stack_entry);
-DEF_VEC_ALLOC_O(stack_entry,heap);
 
 
 /* Find all articulations and call consider_split on them.
@@ -893,7 +889,7 @@ static void
 find_split_points (int overall_time, int overall_size)
 {
   stack_entry first;
-  VEC(stack_entry, heap) *stack = NULL;
+  vec<stack_entry> stack = vec<stack_entry>();
   basic_block bb;
   basic_block return_bb = find_return_bb ();
   struct split_point current;
@@ -912,12 +908,12 @@ find_split_points (int overall_time, int overall_size)
   first.set_ssa_names = 0;
   first.used_ssa_names = 0;
   first.bbs_visited = 0;
-  VEC_safe_push (stack_entry, heap, stack, first);
+  stack.safe_push (first);
   ENTRY_BLOCK_PTR->aux = (void *)(intptr_t)-1;
 
-  while (!VEC_empty (stack_entry, stack))
+  while (!stack.is_empty ())
     {
-      stack_entry *entry = &VEC_last (stack_entry, stack);
+      stack_entry *entry = &stack.last ();
 
       /* We are walking an acyclic graph, so edge_num counts
 	 succ and pred edges together.  However when considering
@@ -926,7 +922,7 @@ find_split_points (int overall_time, int overall_size)
       if (entry->edge_num == EDGE_COUNT (entry->bb->succs)
 	  && entry->bb != ENTRY_BLOCK_PTR)
 	{
-	  int pos = VEC_length (stack_entry, stack);
+	  int pos = stack.length ();
 	  entry->can_split &= visit_bb (entry->bb, return_bb,
 					entry->set_ssa_names,
 					entry->used_ssa_names,
@@ -984,9 +980,9 @@ find_split_points (int overall_time, int overall_size)
 	      new_entry.bb = dest;
 	      new_entry.edge_num = 0;
 	      new_entry.overall_time
-		 = VEC_index (bb_info, bb_info_vec, dest->index).time;
+		 = bb_info_vec[dest->index].time;
 	      new_entry.overall_size
-		 = VEC_index (bb_info, bb_info_vec, dest->index).size;
+		 = bb_info_vec[dest->index].size;
 	      new_entry.earliest = INT_MAX;
 	      new_entry.set_ssa_names = BITMAP_ALLOC (NULL);
 	      new_entry.used_ssa_names = BITMAP_ALLOC (NULL);
@@ -994,8 +990,8 @@ find_split_points (int overall_time, int overall_size)
 	      new_entry.non_ssa_vars = BITMAP_ALLOC (NULL);
 	      new_entry.can_split = true;
 	      bitmap_set_bit (new_entry.bbs_visited, dest->index);
-	      VEC_safe_push (stack_entry, heap, stack, new_entry);
-	      dest->aux = (void *)(intptr_t)VEC_length (stack_entry, stack);
+	      stack.safe_push (new_entry);
+	      dest->aux = (void *)(intptr_t)stack.length ();
 	    }
 	  /* Back edge found, record the earliest point.  */
 	  else if ((intptr_t)dest->aux > 0
@@ -1006,8 +1002,7 @@ find_split_points (int overall_time, int overall_size)
 	 and merge stuff we accumulate during the walk.  */
       else if (entry->bb != ENTRY_BLOCK_PTR)
 	{
-	  stack_entry *prev = &VEC_index (stack_entry, stack,
-					  VEC_length (stack_entry, stack) - 2);
+	  stack_entry *prev = &stack[stack.length () - 2];
 
 	  entry->bb->aux = (void *)(intptr_t)-1;
 	  prev->can_split &= entry->can_split;
@@ -1026,15 +1021,15 @@ find_split_points (int overall_time, int overall_size)
 	  BITMAP_FREE (entry->used_ssa_names);
 	  BITMAP_FREE (entry->bbs_visited);
 	  BITMAP_FREE (entry->non_ssa_vars);
-	  VEC_pop (stack_entry, stack);
+	  stack.pop ();
 	}
       else
-        VEC_pop (stack_entry, stack);
+        stack.pop ();
     }
   ENTRY_BLOCK_PTR->aux = NULL;
   FOR_EACH_BB (bb)
     bb->aux = NULL;
-  VEC_free (stack_entry, heap, stack);
+  stack.release ();
   BITMAP_FREE (current.ssa_names_to_pass);
 }
 
@@ -1043,7 +1038,7 @@ find_split_points (int overall_time, int overall_size)
 static void
 split_function (struct split_point *split_point)
 {
-  VEC (tree, heap) *args_to_pass = NULL;
+  vec<tree> args_to_pass = vec<tree>();
   bitmap args_to_skip;
   tree parm;
   int num = 0;
@@ -1059,7 +1054,7 @@ split_function (struct split_point *split_point)
   gimple last_stmt = NULL;
   unsigned int i;
   tree arg, ddef;
-  VEC(tree, gc) **debug_args = NULL;
+  vec<tree, va_gc> **debug_args = NULL;
 
   if (dump_file)
     {
@@ -1092,7 +1087,7 @@ split_function (struct split_point *split_point)
 
 	if (!useless_type_conversion_p (DECL_ARG_TYPE (parm), TREE_TYPE (arg)))
 	  arg = fold_convert (DECL_ARG_TYPE (parm), arg);
-	VEC_safe_push (tree, heap, args_to_pass, arg);
+	args_to_pass.safe_push (arg);
       }
 
   /* See if the split function will return.  */
@@ -1188,7 +1183,9 @@ split_function (struct split_point *split_point)
 
   /* Now create the actual clone.  */
   rebuild_cgraph_edges ();
-  node = cgraph_function_versioning (cur_node, NULL, NULL, args_to_skip,
+  node = cgraph_function_versioning (cur_node, vec<cgraph_edge_p>(),
+				     NULL,
+				     args_to_skip,
 				     !split_part_return_p,
 				     split_point->split_bbs,
 				     split_point->entry_bb, "part");
@@ -1222,16 +1219,16 @@ split_function (struct split_point *split_point)
 
   /* Produce the call statement.  */
   gsi = gsi_last_bb (call_bb);
-  FOR_EACH_VEC_ELT (tree, args_to_pass, i, arg)
+  FOR_EACH_VEC_ELT (args_to_pass, i, arg)
     if (!is_gimple_val (arg))
       {
 	arg = force_gimple_operand_gsi (&gsi, arg, true, NULL_TREE,
 					false, GSI_CONTINUE_LINKING);
-	VEC_replace (tree, args_to_pass, i, arg);
+	args_to_pass[i] = arg;
       }
   call = gimple_build_call_vec (node->symbol.decl, args_to_pass);
   gimple_set_block (call, DECL_INITIAL (current_function_decl));
-  VEC_free (tree, heap, args_to_pass);
+  args_to_pass.release ();
 
   /* For optimized away parameters, add on the caller side
      before the call
@@ -1261,8 +1258,8 @@ split_function (struct split_point *split_point)
 	  DECL_ARTIFICIAL (ddecl) = 1;
 	  TREE_TYPE (ddecl) = TREE_TYPE (parm);
 	  DECL_MODE (ddecl) = DECL_MODE (parm);
-	  VEC_safe_push (tree, gc, *debug_args, DECL_ORIGIN (parm));
-	  VEC_safe_push (tree, gc, *debug_args, ddecl);
+	  vec_safe_push (*debug_args, DECL_ORIGIN (parm));
+	  vec_safe_push (*debug_args, ddecl);
 	  def_temp = gimple_build_debug_bind (ddecl, unshare_expr (arg),
 					      call);
 	  gsi_insert_after (&gsi, def_temp, GSI_NEW_STMT);
@@ -1284,19 +1281,18 @@ split_function (struct split_point *split_point)
 
       push_cfun (DECL_STRUCT_FUNCTION (node->symbol.decl));
       var = BLOCK_VARS (DECL_INITIAL (node->symbol.decl));
-      i = VEC_length (tree, *debug_args);
+      i = vec_safe_length (*debug_args);
       cgsi = gsi_after_labels (single_succ (ENTRY_BLOCK_PTR));
       do
 	{
 	  i -= 2;
 	  while (var != NULL_TREE
-		 && DECL_ABSTRACT_ORIGIN (var)
-		    != VEC_index (tree, *debug_args, i))
+		 && DECL_ABSTRACT_ORIGIN (var) != (**debug_args)[i])
 	    var = TREE_CHAIN (var);
 	  if (var == NULL_TREE)
 	    break;
 	  vexpr = make_node (DEBUG_EXPR_DECL);
-	  parm = VEC_index (tree, *debug_args, i);
+	  parm = (**debug_args)[i];
 	  DECL_ARTIFICIAL (vexpr) = 1;
 	  TREE_TYPE (vexpr) = TREE_TYPE (parm);
 	  DECL_MODE (vexpr) = DECL_MODE (parm);
@@ -1475,7 +1471,8 @@ execute_split_functions (void)
     }
   /* This can be relaxed; function might become inlinable after splitting
      away the uninlinable part.  */
-  if (inline_edge_summary_vec && !inline_summary (node)->inlinable)
+  if (inline_edge_summary_vec.exists ()
+      && !inline_summary (node)->inlinable)
     {
       if (dump_file)
 	fprintf (dump_file, "Not splitting: not inlinable.\n");
@@ -1537,7 +1534,7 @@ execute_split_functions (void)
   calculate_dominance_info (CDI_DOMINATORS);
 
   /* Compute local info about basic blocks and determine function size/time.  */
-  VEC_safe_grow_cleared (bb_info, heap, bb_info_vec, last_basic_block + 1);
+  bb_info_vec.safe_grow_cleared (last_basic_block + 1);
   memset (&best_split_point, 0, sizeof (best_split_point));
   FOR_EACH_BB (bb)
     {
@@ -1568,8 +1565,8 @@ execute_split_functions (void)
 	}
       overall_time += time;
       overall_size += size;
-      VEC_index (bb_info, bb_info_vec, bb->index).time = time;
-      VEC_index (bb_info, bb_info_vec, bb->index).size = size;
+      bb_info_vec[bb->index].time = time;
+      bb_info_vec[bb->index].size = size;
     }
   find_split_points (overall_time, overall_size);
   if (best_split_point.split_bbs)
@@ -1580,8 +1577,7 @@ execute_split_functions (void)
       todo = TODO_update_ssa | TODO_cleanup_cfg;
     }
   BITMAP_FREE (forbidden_dominators);
-  VEC_free (bb_info, heap, bb_info_vec);
-  bb_info_vec = NULL;
+  bb_info_vec.release ();
   return todo;
 }