Mercurial > jdk8-mips64-public > hotspot / file revision

 /*

  * Copyright (c) 1999, 2012, Oracle and/or its affiliates. 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 Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #include "precompiled.hpp"

 #include "c1/c1_IR.hpp"

 #include "c1/c1_InstructionPrinter.hpp"

 #include "c1/c1_ValueStack.hpp"

 // Implementation of ValueStack

 ValueStack::ValueStack(IRScope* scope, ValueStack* caller_state)

 : _scope(scope)

 , _caller_state(caller_state)

 , _bci(-99)

 , _kind(Parsing)

 , _locals(scope->method()->max_locals(), NULL)

 , _stack(scope->method()->max_stack())

 , _locks()

 {

   verify();

 }

 ValueStack::ValueStack(ValueStack* copy_from, Kind kind, int bci)

   : _scope(copy_from->scope())

   , _caller_state(copy_from->caller_state())

   , _bci(bci)

   , _kind(kind)

   , _locals()

   , _stack()

   , _locks(copy_from->locks_size())

 {

   assert(kind != EmptyExceptionState || !Compilation::current()->env()->should_retain_local_variables(), "need locals");

   if (kind != EmptyExceptionState) {

     // only allocate space if we need to copy the locals-array

     _locals = Values(copy_from->locals_size());

     _locals.appendAll(&copy_from->_locals);

   }

   if (kind != ExceptionState && kind != EmptyExceptionState) {

     if (kind == Parsing) {

       // stack will be modified, so reserve enough space to avoid resizing

       _stack = Values(scope()->method()->max_stack());

     } else {

       // stack will not be modified, so do not waste space

       _stack = Values(copy_from->stack_size());

     }

     _stack.appendAll(&copy_from->_stack);

   }

   _locks.appendAll(&copy_from->_locks);

   verify();

 }

 bool ValueStack::is_same(ValueStack* s) {

   if (scope() != s->scope()) return false;

   if (caller_state() != s->caller_state()) return false;

   if (locals_size() != s->locals_size()) return false;

   if (stack_size() != s->stack_size()) return false;

   if (locks_size() != s->locks_size()) return false;

   // compare each stack element with the corresponding stack element of s

   int index;

   Value value;

   for_each_stack_value(this, index, value) {

     if (value->type()->tag() != s->stack_at(index)->type()->tag()) return false;

   }

   for_each_lock_value(this, index, value) {

     if (value != s->lock_at(index)) return false;

   }

   return true;

 }

 void ValueStack::clear_locals() {

   for (int i = _locals.length() - 1; i >= 0; i--) {

     _locals.at_put(i, NULL);

   }

 }

 void ValueStack::pin_stack_for_linear_scan() {

   for_each_state_value(this, v,

     if (v->as_Constant() == NULL && v->as_Local() == NULL) {

       v->pin(Instruction::PinStackForStateSplit);

     }

   );

 }

 // apply function to all values of a list; factored out from values_do(f)

 void ValueStack::apply(Values list, ValueVisitor* f) {

   for (int i = 0; i < list.length(); i++) {

     Value* va = list.adr_at(i);

     Value v0 = *va;

     if (v0 != NULL && !v0->type()->is_illegal()) {

       f->visit(va);

 #ifdef ASSERT

       Value v1 = *va;

       assert(v1->type()->is_illegal() || v0->type()->tag() == v1->type()->tag(), "types must match");

       assert(!v1->type()->is_double_word() || list.at(i + 1) == NULL, "hi-word of doubleword value must be NULL");

 #endif

       if (v0->type()->is_double_word()) i++;

     }

   }

 }

 void ValueStack::values_do(ValueVisitor* f) {

   ValueStack* state = this;

   for_each_state(state) {

     apply(state->_locals, f);

     apply(state->_stack, f);

     apply(state->_locks, f);

   }

 }

 Values* ValueStack::pop_arguments(int argument_size) {

   assert(stack_size() >= argument_size, "stack too small or too many arguments");

   int base = stack_size() - argument_size;

   Values* args = new Values(argument_size);

   for (int i = base; i < stack_size();) args->push(stack_at_inc(i));

   truncate_stack(base);

   return args;

 }

 int ValueStack::total_locks_size() const {

   int num_locks = 0;

   const ValueStack* state = this;

   for_each_state(state) {

     num_locks += state->locks_size();

   }

   return num_locks;

 }

 int ValueStack::lock(Value obj) {

   _locks.push(obj);

   int num_locks = total_locks_size();

   scope()->set_min_number_of_locks(num_locks);

   return num_locks - 1;

 }

 int ValueStack::unlock() {

   _locks.pop();

   return total_locks_size();

 }

 void ValueStack::setup_phi_for_stack(BlockBegin* b, int index) {

   assert(stack_at(index)->as_Phi() == NULL || stack_at(index)->as_Phi()->block() != b, "phi function already created");

   ValueType* t = stack_at(index)->type();

   Value phi = new Phi(t, b, -index - 1);

   _stack[index] = phi;

   assert(!t->is_double_word() || _stack.at(index + 1) == NULL, "hi-word of doubleword value must be NULL");

 }

 void ValueStack::setup_phi_for_local(BlockBegin* b, int index) {

   assert(local_at(index)->as_Phi() == NULL || local_at(index)->as_Phi()->block() != b, "phi function already created");

   ValueType* t = local_at(index)->type();

   Value phi = new Phi(t, b, index);

   store_local(index, phi);

 }

 #ifndef PRODUCT

 void ValueStack::print() {

   scope()->method()->print_name();

   tty->cr();

   if (stack_is_empty()) {

     tty->print_cr("empty stack");

   } else {

     InstructionPrinter ip;

     for (int i = 0; i < stack_size();) {

       Value t = stack_at_inc(i);

       tty->print("%2d  ", i);

       tty->print("%c%d ", t->type()->tchar(), t->id());

       ip.print_instr(t);

       tty->cr();

     }

   }

   if (!no_active_locks()) {

     InstructionPrinter ip;

     for (int i = 0; i < locks_size(); i++) {

       Value t = lock_at(i);

       tty->print("lock %2d  ", i);

       if (t == NULL) {

         tty->print("this");

       } else {

         tty->print("%c%d ", t->type()->tchar(), t->id());

         ip.print_instr(t);

       }

       tty->cr();

     }

   }

   if (locals_size() > 0) {

     InstructionPrinter ip;

     for (int i = 0; i < locals_size();) {

       Value l = _locals[i];

       tty->print("local %d ", i);

       if (l == NULL) {

         tty->print("null");

         i ++;

       } else {

         tty->print("%c%d ", l->type()->tchar(), l->id());

         ip.print_instr(l);

         if (l->type()->is_illegal() || l->type()->is_single_word()) i ++; else i += 2;

       }

       tty->cr();

     }

   }

   if (caller_state() != NULL) {

     caller_state()->print();

   }

 }

 void ValueStack::verify() {

   assert(scope() != NULL, "scope must exist");

   if (caller_state() != NULL) {

     assert(caller_state()->scope() == scope()->caller(), "invalid caller scope");

     caller_state()->verify();

   }

   if (kind() == Parsing) {

     assert(bci() == -99, "bci not defined during parsing");

   } else {

     assert(bci() >= -1, "bci out of range");

     assert(bci() < scope()->method()->code_size(), "bci out of range");

     assert(bci() == SynchronizationEntryBCI || Bytecodes::is_defined(scope()->method()->java_code_at_bci(bci())), "make sure bci points at a real bytecode");

     assert(scope()->method()->liveness_at_bci(bci()).is_valid(), "liveness at bci must be valid");

   }

   int i;

   for (i = 0; i < stack_size(); i++) {

     Value v = _stack.at(i);

     if (v == NULL) {

       assert(_stack.at(i - 1)->type()->is_double_word(), "only hi-words are NULL on stack");

     } else if (v->type()->is_double_word()) {

       assert(_stack.at(i + 1) == NULL, "hi-word must be NULL");

     }

   }

   for (i = 0; i < locals_size(); i++) {

     Value v = _locals.at(i);

     if (v != NULL && v->type()->is_double_word()) {

       assert(_locals.at(i + 1) == NULL, "hi-word must be NULL");

     }

   }

   for_each_state_value(this, v,

     assert(v != NULL, "just test if state-iteration succeeds");

   );

 }

 #endif // PRODUCT