8279822: CI: Constant pool entries in error state are not supported

Reviewed-by: kvn, thartmann

Author: Vladimir Ivanov

src/hotspot/share/ci/bcEscapeAnalyzer.cpp

@@ -416,11 +416,11 @@ void BCEscapeAnalyzer::iterate_one_block(ciBlock *blk, StateInfo &state, Growabl
         // Avoid calling get_constant() which will try to allocate
         // unloaded constant. We need only constant's type.
         int index = s.get_constant_pool_index();
-        constantTag tag = s.get_constant_pool_tag(index);
-        if (tag.is_long() || tag.is_double()) {
+        BasicType con_bt = s.get_basic_type_for_constant_at(index);
+        if (con_bt == T_LONG || con_bt == T_DOUBLE) {
           // Only longs and doubles use 2 stack slots.
           state.lpush();
-        } else if (tag.basic_type() == T_OBJECT) {
+        } else if (con_bt == T_OBJECT) {
           state.apush(unknown_obj);
         } else {
           state.spush();

src/hotspot/share/ci/ciConstant.hpp

@@ -127,6 +127,17 @@ class ciConstant {
   bool is_valid() const {
     return basic_type() != T_ILLEGAL;
   }
+
+  bool is_loaded() const {
+    if (is_valid()) {
+      if (is_reference_type(basic_type())) {
+        return as_object()->is_loaded();
+      } else {
+        return true;
+      }
+    }
+    return false;
+  }
   // Debugging output
   void print();
 };

src/hotspot/share/ci/ciEnv.cpp

@@ -503,13 +503,6 @@ ciKlass* ciEnv::get_klass_by_name_impl(ciKlass* accessing_klass,
     domain = Handle(current, accessing_klass->protection_domain());
   }
 
-  // setup up the proper type to return on OOM
-  ciKlass* fail_type;
-  if (sym->char_at(0) == JVM_SIGNATURE_ARRAY) {
-    fail_type = _unloaded_ciobjarrayklass;
-  } else {
-    fail_type = _unloaded_ciinstance_klass;
-  }
   Klass* found_klass;
   {
     ttyUnlocker ttyul;  // release tty lock to avoid ordering problems
@@ -591,15 +584,14 @@ ciKlass* ciEnv::get_klass_by_index_impl(const constantPoolHandle& cpool,
                                         int index,
                                         bool& is_accessible,
                                         ciInstanceKlass* accessor) {
-  EXCEPTION_CONTEXT;
   Klass* klass = NULL;
   Symbol* klass_name = NULL;
 
   if (cpool->tag_at(index).is_symbol()) {
     klass_name = cpool->symbol_at(index);
   } else {
     // Check if it's resolved if it's not a symbol constant pool entry.
-    klass =  ConstantPool::klass_at_if_loaded(cpool, index);
+    klass = ConstantPool::klass_at_if_loaded(cpool, index);
     // Try to look it up by name.
     if (klass == NULL) {
       klass_name = cpool->klass_name_at(index);
@@ -666,7 +658,6 @@ ciConstant ciEnv::get_constant_by_index_impl(const constantPoolHandle& cpool,
                                              int pool_index, int cache_index,
                                              ciInstanceKlass* accessor) {
   bool ignore_will_link;
-  EXCEPTION_CONTEXT;
   int index = pool_index;
   if (cache_index >= 0) {
     assert(index < 0, "only one kind of index at a time");
@@ -677,12 +668,14 @@ ciConstant ciEnv::get_constant_by_index_impl(const constantPoolHandle& cpool,
         return ciConstant(T_OBJECT, get_object(NULL));
       }
       BasicType bt = T_OBJECT;
-      if (cpool->tag_at(index).is_dynamic_constant())
+      if (cpool->tag_at(index).is_dynamic_constant()) {
         bt = Signature::basic_type(cpool->uncached_signature_ref_at(index));
-      if (is_reference_type(bt)) {
-      } else {
+      }
+      if (!is_reference_type(bt)) {
         // we have to unbox the primitive value
-        if (!is_java_primitive(bt))  return ciConstant();
+        if (!is_java_primitive(bt)) {
+          return ciConstant();
+        }
         jvalue value;
         BasicType bt2 = java_lang_boxing_object::get_value(obj, &value);
         assert(bt2 == bt, "");
@@ -717,6 +710,7 @@ ciConstant ciEnv::get_constant_by_index_impl(const constantPoolHandle& cpool,
   } else if (tag.is_double()) {
     return ciConstant((jdouble)cpool->double_at(index));
   } else if (tag.is_string()) {
+    EXCEPTION_CONTEXT;
     oop string = NULL;
     assert(cache_index >= 0, "should have a cache index");
     string = cpool->string_at(index, cache_index, THREAD);
@@ -733,24 +727,18 @@ ciConstant ciEnv::get_constant_by_index_impl(const constantPoolHandle& cpool,
       return ciConstant(T_OBJECT, constant);
     }
   } else if (tag.is_unresolved_klass_in_error()) {
-    return ciConstant();
+    return ciConstant(T_OBJECT, get_unloaded_klass_mirror(NULL));
   } else if (tag.is_klass() || tag.is_unresolved_klass()) {
-    // 4881222: allow ldc to take a class type
     ciKlass* klass = get_klass_by_index_impl(cpool, index, ignore_will_link, accessor);
-    if (HAS_PENDING_EXCEPTION) {
-      CLEAR_PENDING_EXCEPTION;
-      record_out_of_memory_failure();
-      return ciConstant();
-    }
     assert (klass->is_instance_klass() || klass->is_array_klass(),
             "must be an instance or array klass ");
     return ciConstant(T_OBJECT, klass->java_mirror());
-  } else if (tag.is_method_type()) {
+  } else if (tag.is_method_type() || tag.is_method_type_in_error()) {
     // must execute Java code to link this CP entry into cache[i].f1
     ciSymbol* signature = get_symbol(cpool->method_type_signature_at(index));
     ciObject* ciobj = get_unloaded_method_type_constant(signature);
     return ciConstant(T_OBJECT, ciobj);
-  } else if (tag.is_method_handle()) {
+  } else if (tag.is_method_handle() || tag.is_method_handle_in_error()) {
     // must execute Java code to link this CP entry into cache[i].f1
     int ref_kind        = cpool->method_handle_ref_kind_at(index);
     int callee_index    = cpool->method_handle_klass_index_at(index);
@@ -759,10 +747,10 @@ ciConstant ciEnv::get_constant_by_index_impl(const constantPoolHandle& cpool,
     ciSymbol* signature = get_symbol(cpool->method_handle_signature_ref_at(index));
     ciObject* ciobj     = get_unloaded_method_handle_constant(callee, name, signature, ref_kind);
     return ciConstant(T_OBJECT, ciobj);
-  } else if (tag.is_dynamic_constant()) {
-    return ciConstant();
+  } else if (tag.is_dynamic_constant() || tag.is_dynamic_constant_in_error()) {
+    return ciConstant(); // not supported
   } else {
-    ShouldNotReachHere();
+    assert(false, "unknown tag: %d (%s)", tag.value(), tag.internal_name());
     return ciConstant();
   }
 }

src/hotspot/share/ci/ciStreams.cpp

@@ -251,6 +251,14 @@ constantTag ciBytecodeStream::get_constant_pool_tag(int index) const {
   return _method->get_Method()->constants()->constant_tag_at(index);
 }
 
+// ------------------------------------------------------------------
+// ciBytecodeStream::get_basic_type_for_constant_at
+//
+BasicType ciBytecodeStream::get_basic_type_for_constant_at(int index) const {
+  VM_ENTRY_MARK;
+  return _method->get_Method()->constants()->basic_type_for_constant_at(index);
+}
+
 // ------------------------------------------------------------------
 // ciBytecodeStream::get_field_index
 //

src/hotspot/share/ci/ciStreams.hpp

@@ -140,7 +140,7 @@ class ciBytecodeStream : StackObj {
 
   bool is_wide() const { return ( _pc == _was_wide ); }
 
-  // Does this instruction contain an index which refes into the CP cache?
+  // Does this instruction contain an index which refers into the CP cache?
   bool has_cache_index() const { return Bytecodes::uses_cp_cache(cur_bc_raw()); }
 
   int get_index_u1() const {
@@ -226,18 +226,27 @@ class ciBytecodeStream : StackObj {
   // constant.  Do not attempt to resolve it, since that would require
   // execution of Java code.  If it is not resolved, return an unloaded
   // object (ciConstant.as_object()->is_loaded() == false).
-  ciConstant get_constant();
+  ciConstant  get_constant();
   constantTag get_constant_pool_tag(int index) const;
+  BasicType   get_basic_type_for_constant_at(int index) const;
 
   // True if the klass-using bytecode points to an unresolved klass
   bool is_unresolved_klass() const {
     constantTag tag = get_constant_pool_tag(get_klass_index());
     return tag.is_unresolved_klass();
   }
 
-  bool is_unresolved_klass_in_error() const {
-    constantTag tag = get_constant_pool_tag(get_klass_index());
-    return tag.is_unresolved_klass_in_error();
+  bool is_in_error() const {
+    assert(cur_bc() == Bytecodes::_ldc    ||
+           cur_bc() == Bytecodes::_ldc_w  ||
+           cur_bc() == Bytecodes::_ldc2_w, "not supported: %s", Bytecodes::name(cur_bc()));
+
+    int index = get_constant_pool_index();
+    constantTag tag = get_constant_pool_tag(index);
+    return tag.is_unresolved_klass_in_error() ||
+           tag.is_method_handle_in_error()    ||
+           tag.is_method_type_in_error()      ||
+           tag.is_dynamic_constant_in_error();
   }
 
   // If this bytecode is one of get_field, get_static, put_field,

src/hotspot/share/ci/ciTypeFlow.cpp

@@ -720,6 +720,11 @@ void ciTypeFlow::StateVector::do_jsr(ciBytecodeStream* str) {
 // ------------------------------------------------------------------
 // ciTypeFlow::StateVector::do_ldc
 void ciTypeFlow::StateVector::do_ldc(ciBytecodeStream* str) {
+  if (str->is_in_error()) {
+    trap(str, NULL, Deoptimization::make_trap_request(Deoptimization::Reason_unhandled,
+                                                      Deoptimization::Action_none));
+    return;
+  }
   ciConstant con = str->get_constant();
   if (con.is_valid()) {
     BasicType basic_type = con.basic_type();
@@ -735,14 +740,10 @@ void ciTypeFlow::StateVector::do_ldc(ciBytecodeStream* str) {
       push_translate(ciType::make(basic_type));
     }
   } else {
-    if (str->is_unresolved_klass_in_error()) {
-      trap(str, NULL, Deoptimization::make_trap_request(Deoptimization::Reason_unhandled,
-                                                        Deoptimization::Action_none));
-    } else {
-      // OutOfMemoryError in the CI while loading constant
-      push_null();
-      outer()->record_failure("ldc did not link");
-    }
+    // OutOfMemoryError in the CI while loading constant.
+    // Unresolved condy also lands here (not yet supported).
+    push_null();
+    outer()->record_failure("ldc did not link");
   }
 }
 
@@ -2173,7 +2174,7 @@ bool ciTypeFlow::can_trap(ciBytecodeStream& str) {
     case Bytecodes::_ldc:
     case Bytecodes::_ldc_w:
     case Bytecodes::_ldc2_w:
-      return str.is_unresolved_klass_in_error();
+      return str.is_in_error();
 
     case Bytecodes::_aload_0:
       // These bytecodes can trap for rewriting.  We need to assume that

src/hotspot/share/oops/constantPool.cpp

@@ -885,11 +885,9 @@ void ConstantPool::save_and_throw_exception(const constantPoolHandle& this_cp, i
 
 constantTag ConstantPool::constant_tag_at(int which) {
   constantTag tag = tag_at(which);
-  if (tag.is_dynamic_constant() ||
-      tag.is_dynamic_constant_in_error()) {
+  if (tag.is_dynamic_constant()) {
     BasicType bt = basic_type_for_constant_at(which);
-    // dynamic constant could return an array, treat as object
-    return constantTag::ofBasicType(is_reference_type(bt) ? T_OBJECT : bt);
+    return constantTag(constantTag::type2tag(bt));
   }
   return tag;
 }
@@ -976,7 +974,6 @@ oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
   switch (tag.value()) {
 
   case JVM_CONSTANT_UnresolvedClass:
-  case JVM_CONSTANT_UnresolvedClassInError:
   case JVM_CONSTANT_Class:
     {
       assert(cache_index == _no_index_sentinel, "should not have been set");
@@ -1044,14 +1041,6 @@ oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
     result_oop = string_at_impl(this_cp, index, cache_index, CHECK_NULL);
     break;
 
-  case JVM_CONSTANT_DynamicInError:
-  case JVM_CONSTANT_MethodHandleInError:
-  case JVM_CONSTANT_MethodTypeInError:
-    {
-      throw_resolution_error(this_cp, index, CHECK_NULL);
-      break;
-    }
-
   case JVM_CONSTANT_MethodHandle:
     {
       int ref_kind                 = this_cp->method_handle_ref_kind_at(index);
@@ -1065,11 +1054,14 @@ oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
                               callee_index, name->as_C_string(), signature->as_C_string());
       }
 
-      Klass* callee = klass_at_impl(this_cp, callee_index, CHECK_NULL);
+      Klass* callee = klass_at_impl(this_cp, callee_index, THREAD);
+      if (HAS_PENDING_EXCEPTION) {
+        save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
+      }
 
       // Check constant pool method consistency
       if ((callee->is_interface() && m_tag.is_method()) ||
-          ((!callee->is_interface() && m_tag.is_interface_method()))) {
+          (!callee->is_interface() && m_tag.is_interface_method())) {
         ResourceMark rm(THREAD);
         stringStream ss;
         ss.print("Inconsistent constant pool data in classfile for class %s. "
@@ -1081,17 +1073,18 @@ oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
                  index,
                  callee->is_interface() ? "CONSTANT_MethodRef" : "CONSTANT_InterfaceMethodRef",
                  callee->is_interface() ? "CONSTANT_InterfaceMethodRef" : "CONSTANT_MethodRef");
-        THROW_MSG_NULL(vmSymbols::java_lang_IncompatibleClassChangeError(), ss.as_string());
+        Exceptions::fthrow(THREAD_AND_LOCATION, vmSymbols::java_lang_IncompatibleClassChangeError(), "%s", ss.as_string());
+        save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
       }
 
       Klass* klass = this_cp->pool_holder();
       Handle value = SystemDictionary::link_method_handle_constant(klass, ref_kind,
                                                                    callee, name, signature,
                                                                    THREAD);
-      result_oop = value();
       if (HAS_PENDING_EXCEPTION) {
         save_and_throw_exception(this_cp, index, tag, CHECK_NULL);
       }
+      result_oop = value();
       break;
     }
 
@@ -1136,10 +1129,15 @@ oop ConstantPool::resolve_constant_at_impl(const constantPoolHandle& this_cp,
     result_oop = java_lang_boxing_object::create(T_DOUBLE, &prim_value, CHECK_NULL);
     break;
 
+  case JVM_CONSTANT_UnresolvedClassInError:
+  case JVM_CONSTANT_DynamicInError:
+  case JVM_CONSTANT_MethodHandleInError:
+  case JVM_CONSTANT_MethodTypeInError:
+    throw_resolution_error(this_cp, index, CHECK_NULL);
+    break;
+
   default:
-    DEBUG_ONLY( tty->print_cr("*** %p: tag at CP[%d/%d] = %d",
-                              this_cp(), index, cache_index, tag.value()));
-    assert(false, "unexpected constant tag");
+    fatal("unexpected constant tag at CP %p[%d/%d] = %d", this_cp(), index, cache_index, tag.value());
     break;
   }
 

src/hotspot/share/opto/parse2.cpp

@@ -1865,33 +1865,35 @@ void Parse::do_one_bytecode() {
   case Bytecodes::_bipush:   push(intcon(iter().get_constant_u1())); break;
   case Bytecodes::_sipush:   push(intcon(iter().get_constant_u2())); break;
   case Bytecodes::_aconst_null: push(null());  break;
+
   case Bytecodes::_ldc:
   case Bytecodes::_ldc_w:
-  case Bytecodes::_ldc2_w:
-    // If the constant is unresolved, run this BC once in the interpreter.
-    {
-      ciConstant constant = iter().get_constant();
-      if (!constant.is_valid() ||
-          (constant.basic_type() == T_OBJECT &&
-           !constant.as_object()->is_loaded())) {
-        int index = iter().get_constant_pool_index();
-        constantTag tag = iter().get_constant_pool_tag(index);
-        uncommon_trap(Deoptimization::make_trap_request
-                      (Deoptimization::Reason_unloaded,
-                       Deoptimization::Action_reinterpret,
-                       index),
-                      NULL, tag.internal_name());
-        break;
-      }
+  case Bytecodes::_ldc2_w: {
+    ciConstant constant = iter().get_constant();
+    if (constant.is_loaded()) {
       assert(constant.basic_type() != T_OBJECT || constant.as_object()->is_instance(),
              "must be java_mirror of klass");
       const Type* con_type = Type::make_from_constant(constant);
       if (con_type != NULL) {
         push_node(con_type->basic_type(), makecon(con_type));
       }
-    }
+    } else {
+      // If the constant is unresolved or in error state, run this BC in the interpreter.
+      if (iter().is_in_error()) {
+        uncommon_trap(Deoptimization::make_trap_request(Deoptimization::Reason_unhandled,
+                                                        Deoptimization::Action_none),
+                      NULL, "constant in error state", true /* must_throw */);
 
+      } else {
+        int index = iter().get_constant_pool_index();
+        uncommon_trap(Deoptimization::make_trap_request(Deoptimization::Reason_unloaded,
+                                                        Deoptimization::Action_reinterpret,
+                                                        index),
+                      NULL, "unresolved constant", false /* must_throw */);
+      }
+    }
     break;
+  }
 
   case Bytecodes::_aload_0:
     push( local(0) );