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hotspot/src/share/vm/opto/parseHelper.cpp

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+/*
+ * Copyright 1998-2007 Sun Microsystems, Inc.  All Rights Reserved.
+ * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
+ *
+ * This code is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License version 2 only, as
+ * published by the Free Software Foundation.
+ *
+ * This code is distributed in the hope that it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
+ * version 2 for more details (a copy is included in the LICENSE file that
+ * accompanied this code).
+ *
+ * You should have received a copy of the GNU General Public License version
+ * 2 along with this work; if not, write to the Free Software Foundation,
+ * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ */
+
+#include "incls/_precompiled.incl"
+#include "incls/_parseHelper.cpp.incl"
+
+//------------------------------make_dtrace_method_entry_exit ----------------
+// Dtrace -- record entry or exit of a method if compiled with dtrace support
+void GraphKit::make_dtrace_method_entry_exit(ciMethod* method, bool is_entry) {
+  const TypeFunc *call_type    = OptoRuntime::dtrace_method_entry_exit_Type();
+  address         call_address = is_entry ? CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_entry) :
+                                            CAST_FROM_FN_PTR(address, SharedRuntime::dtrace_method_exit);
+  const char     *call_name    = is_entry ? "dtrace_method_entry" : "dtrace_method_exit";
+
+  // Get base of thread-local storage area
+  Node* thread = _gvn.transform( new (C, 1) ThreadLocalNode() );
+
+  // Get method
+  const TypeInstPtr* method_type = TypeInstPtr::make(TypePtr::Constant, method->klass(), true, method, 0);
+  Node *method_node = _gvn.transform( new (C, 1) ConPNode(method_type) );
+
+  kill_dead_locals();
+
+  // For some reason, this call reads only raw memory.
+  const TypePtr* raw_adr_type = TypeRawPtr::BOTTOM;
+  make_runtime_call(RC_LEAF | RC_NARROW_MEM,
+                    call_type, call_address,
+                    call_name, raw_adr_type,
+                    thread, method_node);
+}
+
+
+//=============================================================================
+//------------------------------do_checkcast-----------------------------------
+void Parse::do_checkcast() {
+  bool will_link;
+  ciKlass* klass = iter().get_klass(will_link);
+
+  Node *obj = peek();
+
+  // Throw uncommon trap if class is not loaded or the value we are casting
+  // _from_ is not loaded, and value is not null.  If the value _is_ NULL,
+  // then the checkcast does nothing.
+  const TypeInstPtr *tp = _gvn.type(obj)->isa_instptr();
+  if (!will_link || (tp && !tp->is_loaded())) {
+    if (C->log() != NULL) {
+      if (!will_link) {
+        C->log()->elem("assert_null reason='checkcast' klass='%d'",
+                       C->log()->identify(klass));
+      }
+      if (tp && !tp->is_loaded()) {
+        // %%% Cannot happen?
+        C->log()->elem("assert_null reason='checkcast source' klass='%d'",
+                       C->log()->identify(tp->klass()));
+      }
+    }
+    do_null_assert(obj, T_OBJECT);
+    assert( stopped() || _gvn.type(peek())->higher_equal(TypePtr::NULL_PTR), "what's left behind is null" );
+    if (!stopped()) {
+      profile_null_checkcast();
+    }
+    return;
+  }
+
+  Node *res = gen_checkcast(obj, makecon(TypeKlassPtr::make(klass)) );
+
+  // Pop from stack AFTER gen_checkcast because it can uncommon trap and
+  // the debug info has to be correct.
+  pop();
+  push(res);
+}
+
+
+//------------------------------do_instanceof----------------------------------
+void Parse::do_instanceof() {
+  if (stopped())  return;
+  // We would like to return false if class is not loaded, emitting a
+  // dependency, but Java requires instanceof to load its operand.
+
+  // Throw uncommon trap if class is not loaded
+  bool will_link;
+  ciKlass* klass = iter().get_klass(will_link);
+
+  if (!will_link) {
+    if (C->log() != NULL) {
+      C->log()->elem("assert_null reason='instanceof' klass='%d'",
+                     C->log()->identify(klass));
+    }
+    do_null_assert(peek(), T_OBJECT);
+    assert( stopped() || _gvn.type(peek())->higher_equal(TypePtr::NULL_PTR), "what's left behind is null" );
+    if (!stopped()) {
+      // The object is now known to be null.
+      // Shortcut the effect of gen_instanceof and return "false" directly.
+      pop();                   // pop the null
+      push(_gvn.intcon(0));    // push false answer
+    }
+    return;
+  }
+
+  // Push the bool result back on stack
+  push( gen_instanceof( pop(), makecon(TypeKlassPtr::make(klass)) ) );
+}
+
+//------------------------------array_store_check------------------------------
+// pull array from stack and check that the store is valid
+void Parse::array_store_check() {
+
+  // Shorthand access to array store elements
+  Node *obj = stack(_sp-1);
+  Node *idx = stack(_sp-2);
+  Node *ary = stack(_sp-3);
+
+  if (_gvn.type(obj) == TypePtr::NULL_PTR) {
+    // There's never a type check on null values.
+    // This cutout lets us avoid the uncommon_trap(Reason_array_check)
+    // below, which turns into a performance liability if the
+    // gen_checkcast folds up completely.
+    return;
+  }
+
+  // Extract the array klass type
+  int klass_offset = oopDesc::klass_offset_in_bytes();
+  Node* p = basic_plus_adr( ary, ary, klass_offset );
+  // p's type is array-of-OOPS plus klass_offset
+  Node* array_klass = _gvn.transform(new (C, 3) LoadKlassNode(0, immutable_memory(), p, TypeInstPtr::KLASS));
+  // Get the array klass
+  const TypeKlassPtr *tak = _gvn.type(array_klass)->is_klassptr();
+
+  // array_klass's type is generally INexact array-of-oop.  Heroically
+  // cast the array klass to EXACT array and uncommon-trap if the cast
+  // fails.
+  bool always_see_exact_class = false;
+  if (MonomorphicArrayCheck
+      && !too_many_traps(Deoptimization::Reason_array_check)) {
+    always_see_exact_class = true;
+    // (If no MDO at all, hope for the best, until a trap actually occurs.)
+  }
+
+  // Is the array klass is exactly its defined type?
+  if (always_see_exact_class && !tak->klass_is_exact()) {
+    // Make a constant out of the inexact array klass
+    const TypeKlassPtr *extak = tak->cast_to_exactness(true)->is_klassptr();
+    Node* con = makecon(extak);
+    Node* cmp = _gvn.transform(new (C, 3) CmpPNode( array_klass, con ));
+    Node* bol = _gvn.transform(new (C, 2) BoolNode( cmp, BoolTest::eq ));
+    Node* ctrl= control();
+    { BuildCutout unless(this, bol, PROB_MAX);
+      uncommon_trap(Deoptimization::Reason_array_check,
+                    Deoptimization::Action_maybe_recompile,
+                    tak->klass());
+    }
+    if (stopped()) {          // MUST uncommon-trap?
+      set_control(ctrl);      // Then Don't Do It, just fall into the normal checking
+    } else {                  // Cast array klass to exactness:
+      // Use the exact constant value we know it is.
+      replace_in_map(array_klass,con);
+      CompileLog* log = C->log();
+      if (log != NULL) {
+        log->elem("cast_up reason='monomorphic_array' from='%d' to='(exact)'",
+                  log->identify(tak->klass()));
+      }
+      array_klass = con;      // Use cast value moving forward
+    }
+  }
+
+  // Come here for polymorphic array klasses
+
+  // Extract the array element class
+  int element_klass_offset = objArrayKlass::element_klass_offset_in_bytes() + sizeof(oopDesc);
+  Node *p2 = basic_plus_adr(array_klass, array_klass, element_klass_offset);
+  Node *a_e_klass = _gvn.transform(new (C, 3) LoadKlassNode(0, immutable_memory(), p2, tak));
+
+  // Check (the hard way) and throw if not a subklass.
+  // Result is ignored, we just need the CFG effects.
+  gen_checkcast( obj, a_e_klass );
+}
+
+
+//------------------------------do_new-----------------------------------------
+void Parse::do_new() {
+  kill_dead_locals();
+
+  bool will_link;
+  ciInstanceKlass* klass = iter().get_klass(will_link)->as_instance_klass();
+  assert(will_link, "_new: typeflow responsibility");
+
+  // Should initialize, or throw an InstantiationError?
+  if (!klass->is_initialized() ||
+      klass->is_abstract() || klass->is_interface() ||
+      klass->name() == ciSymbol::java_lang_Class() ||
+      iter().is_unresolved_klass()) {
+    uncommon_trap(Deoptimization::Reason_uninitialized,
+                  Deoptimization::Action_reinterpret,
+                  klass);
+    return;
+  }
+
+  Node* kls = makecon(TypeKlassPtr::make(klass));
+  Node* obj = new_instance(kls);
+
+  // Push resultant oop onto stack
+  push(obj);
+}
+
+#ifndef PRODUCT
+//------------------------------dump_map_adr_mem-------------------------------
+// Debug dump of the mapping from address types to MergeMemNode indices.
+void Parse::dump_map_adr_mem() const {
+  tty->print_cr("--- Mapping from address types to memory Nodes ---");
+  MergeMemNode *mem = map() == NULL ? NULL : (map()->memory()->is_MergeMem() ?
+                                      map()->memory()->as_MergeMem() : NULL);
+  for (uint i = 0; i < (uint)C->num_alias_types(); i++) {
+    C->alias_type(i)->print_on(tty);
+    tty->print("\t");
+    // Node mapping, if any
+    if (mem && i < mem->req() && mem->in(i) && mem->in(i) != mem->empty_memory()) {
+      mem->in(i)->dump();
+    } else {
+      tty->cr();
+    }
+  }
+}
+
+#endif
+
+
+//=============================================================================
+//
+// parser methods for profiling
+
+
+//----------------------test_counter_against_threshold ------------------------
+void Parse::test_counter_against_threshold(Node* cnt, int limit) {
+  // Test the counter against the limit and uncommon trap if greater.
+
+  // This code is largely copied from the range check code in
+  // array_addressing()
+
+  // Test invocation count vs threshold
+  Node *threshold = makecon(TypeInt::make(limit));
+  Node *chk   = _gvn.transform( new (C, 3) CmpUNode( cnt, threshold) );
+  BoolTest::mask btest = BoolTest::lt;
+  Node *tst   = _gvn.transform( new (C, 2) BoolNode( chk, btest) );
+  // Branch to failure if threshold exceeded
+  { BuildCutout unless(this, tst, PROB_ALWAYS);
+    uncommon_trap(Deoptimization::Reason_age,
+                  Deoptimization::Action_maybe_recompile);
+  }
+}
+
+//----------------------increment_and_test_invocation_counter-------------------
+void Parse::increment_and_test_invocation_counter(int limit) {
+  if (!count_invocations()) return;
+
+  // Get the methodOop node.
+  const TypePtr* adr_type = TypeOopPtr::make_from_constant(method());
+  Node *methodOop_node = makecon(adr_type);
+
+  // Load the interpreter_invocation_counter from the methodOop.
+  int offset = methodOopDesc::interpreter_invocation_counter_offset_in_bytes();
+  Node* adr_node = basic_plus_adr(methodOop_node, methodOop_node, offset);
+  Node* cnt = make_load(NULL, adr_node, TypeInt::INT, T_INT, adr_type);
+
+  test_counter_against_threshold(cnt, limit);
+
+  // Add one to the counter and store
+  Node* incr = _gvn.transform(new (C, 3) AddINode(cnt, _gvn.intcon(1)));
+  store_to_memory( NULL, adr_node, incr, T_INT, adr_type );
+}
+
+//----------------------------method_data_addressing---------------------------
+Node* Parse::method_data_addressing(ciMethodData* md, ciProfileData* data, ByteSize counter_offset, Node* idx, uint stride) {
+  // Get offset within methodDataOop of the data array
+  ByteSize data_offset = methodDataOopDesc::data_offset();
+
+  // Get cell offset of the ProfileData within data array
+  int cell_offset = md->dp_to_di(data->dp());
+
+  // Add in counter_offset, the # of bytes into the ProfileData of counter or flag
+  int offset = in_bytes(data_offset) + cell_offset + in_bytes(counter_offset);
+
+  const TypePtr* adr_type = TypeOopPtr::make_from_constant(md);
+  Node* mdo = makecon(adr_type);
+  Node* ptr = basic_plus_adr(mdo, mdo, offset);
+
+  if (stride != 0) {
+    Node* str = _gvn.MakeConX(stride);
+    Node* scale = _gvn.transform( new (C, 3) MulXNode( idx, str ) );
+    ptr   = _gvn.transform( new (C, 4) AddPNode( mdo, ptr, scale ) );
+  }
+
+  return ptr;
+}
+
+//--------------------------increment_md_counter_at----------------------------
+void Parse::increment_md_counter_at(ciMethodData* md, ciProfileData* data, ByteSize counter_offset, Node* idx, uint stride) {
+  Node* adr_node = method_data_addressing(md, data, counter_offset, idx, stride);
+
+  const TypePtr* adr_type = _gvn.type(adr_node)->is_ptr();
+  Node* cnt  = make_load(NULL, adr_node, TypeInt::INT, T_INT, adr_type);
+  Node* incr = _gvn.transform(new (C, 3) AddINode(cnt, _gvn.intcon(DataLayout::counter_increment)));
+  store_to_memory(NULL, adr_node, incr, T_INT, adr_type );
+}
+
+//--------------------------test_for_osr_md_counter_at-------------------------
+void Parse::test_for_osr_md_counter_at(ciMethodData* md, ciProfileData* data, ByteSize counter_offset, int limit) {
+  Node* adr_node = method_data_addressing(md, data, counter_offset);
+
+  const TypePtr* adr_type = _gvn.type(adr_node)->is_ptr();
+  Node* cnt  = make_load(NULL, adr_node, TypeInt::INT, T_INT, adr_type);
+
+  test_counter_against_threshold(cnt, limit);
+}
+
+//-------------------------------set_md_flag_at--------------------------------
+void Parse::set_md_flag_at(ciMethodData* md, ciProfileData* data, int flag_constant) {
+  Node* adr_node = method_data_addressing(md, data, DataLayout::flags_offset());
+
+  const TypePtr* adr_type = _gvn.type(adr_node)->is_ptr();
+  Node* flags = make_load(NULL, adr_node, TypeInt::BYTE, T_BYTE, adr_type);
+  Node* incr = _gvn.transform(new (C, 3) OrINode(flags, _gvn.intcon(flag_constant)));
+  store_to_memory(NULL, adr_node, incr, T_BYTE, adr_type);
+}
+
+//----------------------------profile_taken_branch-----------------------------
+void Parse::profile_taken_branch(int target_bci, bool force_update) {
+  // This is a potential osr_site if we have a backedge.
+  int cur_bci = bci();
+  bool osr_site =
+    (target_bci <= cur_bci) && count_invocations() && UseOnStackReplacement;
+
+  // If we are going to OSR, restart at the target bytecode.
+  set_bci(target_bci);
+
+  // To do: factor out the the limit calculations below. These duplicate
+  // the similar limit calculations in the interpreter.
+
+  if (method_data_update() || force_update) {
+    ciMethodData* md = method()->method_data();
+    assert(md != NULL, "expected valid ciMethodData");
+    ciProfileData* data = md->bci_to_data(cur_bci);
+    assert(data->is_JumpData(), "need JumpData for taken branch");
+    increment_md_counter_at(md, data, JumpData::taken_offset());
+  }
+
+  // In the new tiered system this is all we need to do. In the old
+  // (c2 based) tiered sytem we must do the code below.
+#ifndef TIERED
+  if (method_data_update()) {
+    ciMethodData* md = method()->method_data();
+    if (osr_site) {
+      ciProfileData* data = md->bci_to_data(cur_bci);
+      int limit = (CompileThreshold
+                   * (OnStackReplacePercentage - InterpreterProfilePercentage)) / 100;
+      test_for_osr_md_counter_at(md, data, JumpData::taken_offset(), limit);
+    }
+  } else {
+    // With method data update off, use the invocation counter to trigger an
+    // OSR compilation, as done in the interpreter.
+    if (osr_site) {
+      int limit = (CompileThreshold * OnStackReplacePercentage) / 100;
+      increment_and_test_invocation_counter(limit);
+    }
+  }
+#endif // TIERED
+
+  // Restore the original bytecode.
+  set_bci(cur_bci);
+}
+
+//--------------------------profile_not_taken_branch---------------------------
+void Parse::profile_not_taken_branch(bool force_update) {
+
+  if (method_data_update() || force_update) {
+    ciMethodData* md = method()->method_data();
+    assert(md != NULL, "expected valid ciMethodData");
+    ciProfileData* data = md->bci_to_data(bci());
+    assert(data->is_BranchData(), "need BranchData for not taken branch");
+    increment_md_counter_at(md, data, BranchData::not_taken_offset());
+  }
+
+}
+
+//---------------------------------profile_call--------------------------------
+void Parse::profile_call(Node* receiver) {
+  if (!method_data_update()) return;
+
+  profile_generic_call();
+
+  switch (bc()) {
+  case Bytecodes::_invokevirtual:
+  case Bytecodes::_invokeinterface:
+    profile_receiver_type(receiver);
+    break;
+  case Bytecodes::_invokestatic:
+  case Bytecodes::_invokespecial:
+    break;
+  default: fatal("unexpected call bytecode");
+  }
+}
+
+//------------------------------profile_generic_call---------------------------
+void Parse::profile_generic_call() {
+  assert(method_data_update(), "must be generating profile code");
+
+  ciMethodData* md = method()->method_data();
+  assert(md != NULL, "expected valid ciMethodData");
+  ciProfileData* data = md->bci_to_data(bci());
+  assert(data->is_CounterData(), "need CounterData for not taken branch");
+  increment_md_counter_at(md, data, CounterData::count_offset());
+}
+
+//-----------------------------profile_receiver_type---------------------------
+void Parse::profile_receiver_type(Node* receiver) {
+  assert(method_data_update(), "must be generating profile code");
+
+  // Skip if we aren't tracking receivers
+  if (TypeProfileWidth < 1) return;
+
+  ciMethodData* md = method()->method_data();
+  assert(md != NULL, "expected valid ciMethodData");
+  ciProfileData* data = md->bci_to_data(bci());
+  assert(data->is_ReceiverTypeData(), "need ReceiverTypeData here");
+  ciReceiverTypeData* rdata = (ciReceiverTypeData*)data->as_ReceiverTypeData();
+
+  Node* method_data = method_data_addressing(md, rdata, in_ByteSize(0));
+
+  // Using an adr_type of TypePtr::BOTTOM to work around anti-dep problems.
+  // A better solution might be to use TypeRawPtr::BOTTOM with RC_NARROW_MEM.
+  make_runtime_call(RC_LEAF, OptoRuntime::profile_receiver_type_Type(),
+                    CAST_FROM_FN_PTR(address,
+                                     OptoRuntime::profile_receiver_type_C),
+                    "profile_receiver_type_C",
+                    TypePtr::BOTTOM,
+                    method_data, receiver);
+}
+
+//---------------------------------profile_ret---------------------------------
+void Parse::profile_ret(int target_bci) {
+  if (!method_data_update()) return;
+
+  // Skip if we aren't tracking ret targets
+  if (TypeProfileWidth < 1) return;
+
+  ciMethodData* md = method()->method_data();
+  assert(md != NULL, "expected valid ciMethodData");
+  ciProfileData* data = md->bci_to_data(bci());
+  assert(data->is_RetData(), "need RetData for ret");
+  ciRetData* ret_data = (ciRetData*)data->as_RetData();
+
+  // Look for the target_bci is already in the table
+  uint row;
+  bool table_full = true;
+  for (row = 0; row < ret_data->row_limit(); row++) {
+    int key = ret_data->bci(row);
+    table_full &= (key != RetData::no_bci);
+    if (key == target_bci) break;
+  }
+
+  if (row >= ret_data->row_limit()) {
+    // The target_bci was not found in the table.
+    if (!table_full) {
+      // XXX: Make slow call to update RetData
+    }
+    return;
+  }
+
+  // the target_bci is already in the table
+  increment_md_counter_at(md, data, RetData::bci_count_offset(row));
+}
+
+//--------------------------profile_null_checkcast----------------------------
+void Parse::profile_null_checkcast() {
+  // Set the null-seen flag, done in conjunction with the usual null check. We
+  // never unset the flag, so this is a one-way switch.
+  if (!method_data_update()) return;
+
+  ciMethodData* md = method()->method_data();
+  assert(md != NULL, "expected valid ciMethodData");
+  ciProfileData* data = md->bci_to_data(bci());
+  assert(data->is_BitData(), "need BitData for checkcast");
+  set_md_flag_at(md, data, BitData::null_seen_byte_constant());
+}
+
+//-----------------------------profile_switch_case-----------------------------
+void Parse::profile_switch_case(int table_index) {
+  if (!method_data_update()) return;
+
+  ciMethodData* md = method()->method_data();
+  assert(md != NULL, "expected valid ciMethodData");
+
+  ciProfileData* data = md->bci_to_data(bci());
+  assert(data->is_MultiBranchData(), "need MultiBranchData for switch case");
+  if (table_index >= 0) {
+    increment_md_counter_at(md, data, MultiBranchData::case_count_offset(table_index));
+  } else {
+    increment_md_counter_at(md, data, MultiBranchData::default_count_offset());
+  }
+}