OpenJDK / valhalla / valhalla

changeset 53561:530ea41023b2 lworld

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8216270: [lworld] C2 compilation fails with Error mixing types: NULL and valuetype[3]
author thartmann
date Tue, 08 Jan 2019 17:09:51 +0100
parents 09d9f9085910
children 5e2f5c15f970
files src/hotspot/share/opto/callnode.cpp src/hotspot/share/opto/compile.cpp src/hotspot/share/opto/macro.cpp src/hotspot/share/opto/parse1.cpp src/hotspot/share/opto/valuetypenode.cpp src/hotspot/share/opto/valuetypenode.hpp test/hotspot/jtreg/compiler/valhalla/valuetypes/TestCallingConvention.java
diffstat 7 files changed, 65 insertions(+), 77 deletions(-) [+]
line wrap: on
line diff
--- a/src/hotspot/share/opto/callnode.cpp	Mon Jan 07 10:53:29 2019 +0100
+++ b/src/hotspot/share/opto/callnode.cpp	Tue Jan 08 17:09:51 2019 +0100
@@ -1194,31 +1194,7 @@
 //------------------------------Ideal------------------------------------------
 // Skip over any collapsed Regions
 Node *SafePointNode::Ideal(PhaseGVN *phase, bool can_reshape) {
-  if (remove_dead_region(phase, can_reshape)) {
-    return this;
-  }
-  if (jvms() != NULL) {
-    bool progress = false;
-    // A ValueTypeNode that was already heap allocated in the debug
-    // info?  Reference the object directly. Helps removal of useless
-    // value type allocations with incremental inlining.
-    for (uint i = jvms()->debug_start(); i < jvms()->debug_end(); i++) {
-      Node *arg = in(i);
-      if (arg->is_ValueType()) {
-        ValueTypeNode* vt = arg->as_ValueType();
-        Node* in_oop = vt->get_oop();
-        const Type* oop_type = phase->type(in_oop);
-        if (!TypePtr::NULL_PTR->higher_equal(oop_type)) {
-          set_req(i, in_oop);
-          progress = true;
-        }
-      }
-    }
-    if (progress) {
-      return this;
-    }
-  }
-  return NULL;
+  return remove_dead_region(phase, can_reshape) ? this : NULL;
 }
 
 //------------------------------Identity---------------------------------------
--- a/src/hotspot/share/opto/compile.cpp	Mon Jan 07 10:53:29 2019 +0100
+++ b/src/hotspot/share/opto/compile.cpp	Tue Jan 08 17:09:51 2019 +0100
@@ -2071,7 +2071,7 @@
   // Make value types scalar in safepoints
   while (_value_type_nodes->size() != 0) {
     ValueTypeBaseNode* vt = _value_type_nodes->pop()->as_ValueTypeBase();
-    vt->make_scalar_in_safepoints(igvn.C->root(), &igvn);
+    vt->make_scalar_in_safepoints(&igvn);
     if (vt->is_ValueTypePtr()) {
       igvn.replace_node(vt, vt->get_oop());
     }
--- a/src/hotspot/share/opto/macro.cpp	Mon Jan 07 10:53:29 2019 +0100
+++ b/src/hotspot/share/opto/macro.cpp	Tue Jan 08 17:09:51 2019 +0100
@@ -966,7 +966,7 @@
   // Scalarize value types that were added to the safepoint
   for (uint i = 0; i < value_worklist.size(); ++i) {
     Node* vt = value_worklist.at(i);
-    vt->as_ValueType()->make_scalar_in_safepoints(C->root(), &_igvn);
+    vt->as_ValueType()->make_scalar_in_safepoints(&_igvn);
   }
   return true;
 }
--- a/src/hotspot/share/opto/parse1.cpp	Mon Jan 07 10:53:29 2019 +0100
+++ b/src/hotspot/share/opto/parse1.cpp	Tue Jan 08 17:09:51 2019 +0100
@@ -1118,12 +1118,7 @@
       BasicType ret_bt = method()->return_type()->basic_type();
       ret_phi = mask_int_value(ret_phi, ret_bt, &_gvn);
     }
-    if (_caller->has_method() && ret_type->is_valuetypeptr()) {
-      // Inlined methods return a ValueTypeNode
-      _exits.push_node(T_VALUETYPE, ret_phi);
-    } else {
-      _exits.push_node(ret_type->basic_type(), ret_phi);
-    }
+    _exits.push_node(ret_type->basic_type(), ret_phi);
   }
 
   // Note:  Logic for creating and optimizing the ReturnNode is in Compile.
@@ -2329,20 +2324,23 @@
   // frame pointer is always same, already captured
   if (value != NULL) {
     Node* phi = _exits.argument(0);
-    const TypeOopPtr* tr = phi->bottom_type()->isa_oopptr();
-    if (tf()->returns_value_type_as_fields() && !_caller->has_method() && !value->is_ValueType()) {
-      // TODO there should be a checkcast in between, right?
-      value = ValueTypeNode::make_from_oop(this, value, phi->bottom_type()->is_valuetype()->value_klass());
-    }
-    if (value->is_ValueType() && !_caller->has_method()) {
-      // Value type is returned as oop from root method
-      if (tf()->returns_value_type_as_fields()) {
-        // Make sure non-flattened value type fields are allocated
+    const Type* return_type = phi->bottom_type();
+    const TypeOopPtr* tr = return_type->isa_oopptr();
+    if (return_type->isa_valuetype()) {
+      // Value type is returned as fields, make sure it is scalarized
+      if (!value->is_ValueType()) {
+        value = ValueTypeNode::make_from_oop(this, value, return_type->is_valuetype()->value_klass());
+      }
+      if (!_caller->has_method()) {
+        // Value type is returned as fields from root method, make
+        // sure all non-flattened value type fields are allocated.
+        assert(tf()->returns_value_type_as_fields(), "must be returned as fields");
         value = value->as_ValueType()->allocate_fields(this);
-      } else {
-        // Make sure value type is allocated
-        value = value->as_ValueType()->allocate(this)->get_oop();
       }
+    } else if (value->is_ValueType()) {
+      // Value type is returned as oop, make sure it is allocated
+      assert(tr && tr->can_be_value_type(), "must return a value type pointer");
+      value = ValueTypePtrNode::make_from_value_type(this, value->as_ValueType());
     } else if (tr && tr->isa_instptr() && tr->klass()->is_loaded() && tr->klass()->is_interface()) {
       // If returning oops to an interface-return, there is a silent free
       // cast from oop to interface allowed by the Verifier. Make it explicit here.
@@ -2358,10 +2356,10 @@
       // Handle returns of oop-arrays to an arrays-of-interface return
       const TypeInstPtr* phi_tip;
       const TypeInstPtr* val_tip;
-      Type::get_arrays_base_elements(phi->bottom_type(), value->bottom_type(), &phi_tip, &val_tip);
+      Type::get_arrays_base_elements(return_type, value->bottom_type(), &phi_tip, &val_tip);
       if (phi_tip != NULL && phi_tip->is_loaded() && phi_tip->klass()->is_interface() &&
           val_tip != NULL && val_tip->is_loaded() && !val_tip->klass()->is_interface()) {
-        value = _gvn.transform(new CheckCastPPNode(0, value, phi->bottom_type()));
+        value = _gvn.transform(new CheckCastPPNode(0, value, return_type));
       }
     }
     phi->add_req(value);
--- a/src/hotspot/share/opto/valuetypenode.cpp	Mon Jan 07 10:53:29 2019 +0100
+++ b/src/hotspot/share/opto/valuetypenode.cpp	Tue Jan 08 17:09:51 2019 +0100
@@ -195,7 +195,7 @@
   return field->is_flattenable();
 }
 
-int ValueTypeBaseNode::make_scalar_in_safepoint(Unique_Node_List& worklist, SafePointNode* sfpt, Node* root, PhaseGVN* gvn) {
+int ValueTypeBaseNode::make_scalar_in_safepoint(PhaseIterGVN* igvn, Unique_Node_List& worklist, SafePointNode* sfpt) {
   ciValueKlass* vk = value_klass();
   uint nfields = vk->nof_nonstatic_fields();
   JVMState* jvms = sfpt->jvms();
@@ -209,48 +209,45 @@
                                                                   NULL,
 #endif
                                                                   first_ind, nfields);
-  sobj->init_req(0, root);
+  sobj->init_req(0, igvn->C->root());
   // Iterate over the value type fields in order of increasing
   // offset and add the field values to the safepoint.
   for (uint j = 0; j < nfields; ++j) {
     int offset = vk->nonstatic_field_at(j)->offset();
     Node* value = field_value_by_offset(offset, true /* include flattened value type fields */);
     if (value->is_ValueType()) {
-      if (value->as_ValueType()->is_allocated(gvn)) {
-        value = value->as_ValueType()->get_oop();
-      } else {
-        // Add non-flattened value type field to the worklist to process later
-        worklist.push(value);
-      }
+      // Add value type field to the worklist to process later
+      worklist.push(value);
     }
     sfpt->add_req(value);
   }
   jvms->set_endoff(sfpt->req());
-  if (gvn != NULL) {
-    sobj = gvn->transform(sobj)->as_SafePointScalarObject();
-    gvn->igvn_rehash_node_delayed(sfpt);
-  }
+  sobj = igvn->transform(sobj)->as_SafePointScalarObject();
+  igvn->rehash_node_delayed(sfpt);
   return sfpt->replace_edges_in_range(this, sobj, start, end);
 }
 
-void ValueTypeBaseNode::make_scalar_in_safepoints(Node* root, PhaseGVN* gvn) {
+void ValueTypeBaseNode::make_scalar_in_safepoints(PhaseIterGVN* igvn) {
   // Process all safepoint uses and scalarize value type
   Unique_Node_List worklist;
   for (DUIterator_Fast imax, i = fast_outs(imax); i < imax; i++) {
-    Node* u = fast_out(i);
-    if (u->is_SafePoint() && !u->is_CallLeaf() && (!u->is_Call() || u->as_Call()->has_debug_use(this))) {
-      SafePointNode* sfpt = u->as_SafePoint();
-      Node* in_oop = get_oop();
-      const Type* oop_type = in_oop->bottom_type();
-      assert(Opcode() == Op_ValueTypePtr || !isa_ValueType()->is_allocated(gvn), "already heap allocated value types should be linked directly");
-      int nb = make_scalar_in_safepoint(worklist, sfpt, root, gvn);
+    SafePointNode* sfpt = fast_out(i)->isa_SafePoint();
+    if (sfpt != NULL && !sfpt->is_CallLeaf() && (!sfpt->is_Call() || sfpt->as_Call()->has_debug_use(this))) {
+      int nb = 0;
+      if (is_allocated(igvn) && get_oop()->is_Con()) {
+        // Value type is allocated with a constant oop, link it directly
+        nb = sfpt->replace_edges_in_range(this, get_oop(), sfpt->jvms()->debug_start(), sfpt->jvms()->debug_end());
+        igvn->rehash_node_delayed(sfpt);
+      } else {
+        nb = make_scalar_in_safepoint(igvn, worklist, sfpt);
+      }
       --i; imax -= nb;
     }
   }
   // Now scalarize non-flattened fields
   for (uint i = 0; i < worklist.size(); ++i) {
     Node* vt = worklist.at(i);
-    vt->as_ValueType()->make_scalar_in_safepoints(root, gvn);
+    vt->as_ValueType()->make_scalar_in_safepoints(igvn);
   }
 }
 
@@ -810,13 +807,7 @@
                 StoreNode* store = addp->fast_out(k)->isa_Store();
                 if (store != NULL && store->outcnt() != 0) {
                   // Remove the useless store
-                  Node* mem = store->in(MemNode::Memory);
-                  Node* val = store->in(MemNode::ValueIn);
-                  val = val->is_EncodeP() ? val->in(1) : val;
-                  const Type* val_type = igvn->type(val);
-                  assert(val_type->is_zero_type() || (val->is_Con() && val_type->make_ptr()->is_valuetypeptr()),
-                         "must be zero-type or default value store");
-                  igvn->replace_in_uses(store, mem);
+                  igvn->replace_in_uses(store, store->in(MemNode::Memory));
                 }
               }
             }
--- a/src/hotspot/share/opto/valuetypenode.hpp	Mon Jan 07 10:53:29 2019 +0100
+++ b/src/hotspot/share/opto/valuetypenode.hpp	Tue Jan 08 17:09:51 2019 +0100
@@ -48,7 +48,7 @@
   // Get the klass defining the field layout of the value type
   virtual ciValueKlass* value_klass() const = 0;
 
-  int make_scalar_in_safepoint(Unique_Node_List& worklist, SafePointNode* sfpt, Node* root, PhaseGVN* gvn);
+  int make_scalar_in_safepoint(PhaseIterGVN* igvn, Unique_Node_List& worklist, SafePointNode* sfpt);
 
   // Initialize the value type fields with the inputs or outputs of a MultiNode
   void initialize(GraphKit* kit, MultiNode* multi, ciValueKlass* vk, int base_offset, uint& base_input, bool in);
@@ -78,7 +78,7 @@
   bool          field_is_flattenable(uint index) const;
 
   // Replace ValueTypeNodes in debug info at safepoints with SafePointScalarObjectNodes
-  void make_scalar_in_safepoints(Node* root, PhaseGVN* gvn);
+  void make_scalar_in_safepoints(PhaseIterGVN* igvn);
 
   // Store the value type as a flattened (headerless) representation
   void store_flattened(GraphKit* kit, Node* base, Node* ptr, ciInstanceKlass* holder = NULL, int holder_offset = 0) const;
--- a/test/hotspot/jtreg/compiler/valhalla/valuetypes/TestCallingConvention.java	Mon Jan 07 10:53:29 2019 +0100
+++ b/test/hotspot/jtreg/compiler/valhalla/valuetypes/TestCallingConvention.java	Tue Jan 08 17:09:51 2019 +0100
@@ -479,4 +479,27 @@
         MyValue2.box vt = test24();
         Asserts.assertEQ(vt, null);
     }
+
+    // Same as test24 but with control flow and inlining
+    @ForceInline
+    public MyValue2.box test26_callee(boolean b) {
+        if (b) {
+            return null;
+        } else {
+            return MyValue2.createWithFieldsInline(rI, true);
+        }
+    }
+
+    @Test
+    public MyValue2.box test26(boolean b) {
+        return test26_callee(b);
+    }
+
+    @DontCompile
+    public void test26_verifier(boolean warmup) {
+        MyValue2.box vt = test26(true);
+        Asserts.assertEQ(vt, null);
+        vt = test26(false);
+        Asserts.assertEQ(vt.hash(), MyValue2.createWithFieldsInline(rI, true).hash());
+    }
 }
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