cgraph.c (cgraph_node::create_indirect_edge): Copy speculative data.

	* cgraph.c (cgraph_node::create_indirect_edge): Copy speculative data.
	* cgraph.h (cgraph_indirect_call_info): Add speculative data.
	* gimple-fold.c (fold_gimple_assign): Fix check for virtual
	call.
	* ipa-devirt.c (ipa_dummy_polymorphic_call_context): Update
	(contains_type_p): Forward declare.
	(polymorphic_call_target_hasher::hash): Hash speculative info.
	(polymorphic_call_target_hasher::equal): Compare speculative info.
	(get_class_context): Handle speuclation.
	(contains_type_p): Update.
	(get_polymorphic_call_info_for_decl): Update.
	(walk_ssa_copies): Break out from ...
	(get_polymorphic_call_info): ... here; set speculative context
	before giving up.
	* ipa-prop.c (ipa_write_indirect_edge_info, ipa_read_indirect_edge_info):
	Stream speculative context.
	* ipa-utils.h (ipa_polymorphic_call_context): Add speculative info
	(SPECULATIVE_OFFSET, SPECULATIVE_OUTER_TYPE,
	SPECULATIVE_MAYBE_DERIVED_TYPE).
	(possible_polymorphic_call_targets overriders): Update.
	(dump_possible_polymorphic_call_targets overriders): Update.
	(dump_possible_polymorphic_call_target_p overriders): Update.

From-SVN: r213152

1 files changed, 20 insertions, 6 deletions

diff --git a/gcc/ipa-utils.h b/gcc/ipa-utils.h
index bb2e0d5..1254304 100644
--- a/gcc/ipa-utils.h
+++ b/gcc/ipa-utils.h
@@ -38,13 +38,19 @@ struct ipa_dfs_info {
    type inheritance graph.  */
 struct ipa_polymorphic_call_context {
   /* The called object appears in an object of type OUTER_TYPE
-     at offset OFFSET.  */
+     at offset OFFSET.  When information is not 100% reliable, we
+     use SPECULATIVE_OUTER_TYPE and SPECULATIVE_OFFSET. */
   HOST_WIDE_INT offset;
+  HOST_WIDE_INT speculative_offset;
   tree outer_type;
+  tree speculative_outer_type;
   /* True if outer object may be in construction or destruction.  */
   bool maybe_in_construction;
   /* True if outer object may be of derived type.  */
   bool maybe_derived_type;
+  /* True if speculative outer object may be of derived type.  We always
+     speculate that construction does not happen.  */
+  bool speculative_maybe_derived_type;
 };
 
 /* Context representing "I know nothing".  */
@@ -89,6 +95,7 @@ tree get_polymorphic_call_info (tree, tree, tree *,
 				HOST_WIDE_INT *,
 				ipa_polymorphic_call_context *,
 				gimple call = NULL);
+bool get_dynamic_type (tree, ipa_polymorphic_call_context *, tree, gimple);
 bool get_polymorphic_call_info_from_invariant (ipa_polymorphic_call_context *,
 					       tree, tree, HOST_WIDE_INT);
 bool decl_maybe_in_construction_p (tree, tree, gimple, tree);
@@ -114,9 +121,12 @@ possible_polymorphic_call_targets (struct cgraph_edge *e,
 {
   gcc_checking_assert (e->indirect_info->polymorphic);
   ipa_polymorphic_call_context context = {e->indirect_info->offset,
+					  e->indirect_info->speculative_offset,
 					  e->indirect_info->outer_type,
+					  e->indirect_info->speculative_outer_type,
 					  e->indirect_info->maybe_in_construction,
-					  e->indirect_info->maybe_derived_type};
+					  e->indirect_info->maybe_derived_type,
+					  e->indirect_info->speculative_maybe_derived_type};
   return possible_polymorphic_call_targets (e->indirect_info->otr_type,
 					    e->indirect_info->otr_token,
 					    context,
@@ -153,9 +163,12 @@ dump_possible_polymorphic_call_targets (FILE *f, struct cgraph_edge *e)
 {
   gcc_checking_assert (e->indirect_info->polymorphic);
   ipa_polymorphic_call_context context = {e->indirect_info->offset,
+					  e->indirect_info->speculative_offset,
 					  e->indirect_info->outer_type,
+					  e->indirect_info->speculative_outer_type,
 					  e->indirect_info->maybe_in_construction,
-					  e->indirect_info->maybe_derived_type};
+					  e->indirect_info->maybe_derived_type,
+					  e->indirect_info->speculative_maybe_derived_type};
   dump_possible_polymorphic_call_targets (f, e->indirect_info->otr_type,
 					  e->indirect_info->otr_token,
 					  context);
@@ -168,10 +181,11 @@ inline bool
 possible_polymorphic_call_target_p (struct cgraph_edge *e,
 				    struct cgraph_node *n)
 {
-  ipa_polymorphic_call_context context = {e->indirect_info->offset,
-					  e->indirect_info->outer_type,
+  ipa_polymorphic_call_context context = {e->indirect_info->offset, 0,
+					  e->indirect_info->outer_type, NULL,
 					  e->indirect_info->maybe_in_construction,
-					  e->indirect_info->maybe_derived_type};
+					  e->indirect_info->maybe_derived_type,
+					  false};
   return possible_polymorphic_call_target_p (e->indirect_info->otr_type,
 					     e->indirect_info->otr_token,
 					     context, n);