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 /*

  * Copyright (c) 2005, 2010, 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.

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  */

 #include "precompiled.hpp"

 #include "c1/c1_FpuStackSim.hpp"

 #include "c1/c1_FrameMap.hpp"

 #include "utilities/array.hpp"

 #include "utilities/ostream.hpp"

 //--------------------------------------------------------

 //               FpuStackSim

 //--------------------------------------------------------

 // This class maps the FPU registers to their stack locations; it computes

 // the offsets between individual registers and simulates the FPU stack.

 const int EMPTY = -1;

 int FpuStackSim::regs_at(int i) const {

   assert(i >= 0 && i < FrameMap::nof_fpu_regs, "out of bounds");

   return _regs[i];

 }

 void FpuStackSim::set_regs_at(int i, int val) {

   assert(i >= 0 && i < FrameMap::nof_fpu_regs, "out of bounds");

   _regs[i] = val;

 }

 void FpuStackSim::dec_stack_size() {

   _stack_size--;

   assert(_stack_size >= 0, "FPU stack underflow");

 }

 void FpuStackSim::inc_stack_size() {

   _stack_size++;

   assert(_stack_size <= FrameMap::nof_fpu_regs, "FPU stack overflow");

 }

 FpuStackSim::FpuStackSim(Compilation* compilation)

  : _compilation(compilation)

 {

   _stack_size = 0;

   for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {

     set_regs_at(i, EMPTY);

   }

 }

 void FpuStackSim::pop() {

   if (TraceFPUStack) { tty->print("FPU-pop "); print(); tty->cr(); }

   set_regs_at(tos_index(), EMPTY);

   dec_stack_size();

 }

 void FpuStackSim::pop(int rnr) {

   if (TraceFPUStack) { tty->print("FPU-pop %d", rnr); print(); tty->cr(); }

   assert(regs_at(tos_index()) == rnr, "rnr is not on TOS");

   set_regs_at(tos_index(), EMPTY);

   dec_stack_size();

 }

 void FpuStackSim::push(int rnr) {

   if (TraceFPUStack) { tty->print("FPU-push %d", rnr); print(); tty->cr(); }

   assert(regs_at(stack_size()) == EMPTY, "should be empty");

   set_regs_at(stack_size(), rnr);

   inc_stack_size();

 }

 void FpuStackSim::swap(int offset) {

   if (TraceFPUStack) { tty->print("FPU-swap %d", offset); print(); tty->cr(); }

   int t = regs_at(tos_index() - offset);

   set_regs_at(tos_index() - offset, regs_at(tos_index()));

   set_regs_at(tos_index(), t);

 }

 int FpuStackSim::offset_from_tos(int rnr) const {

   for (int i = tos_index(); i >= 0; i--) {

     if (regs_at(i) == rnr) {

       return tos_index() - i;

     }

   }

   assert(false, "FpuStackSim: register not found");

   BAILOUT_("FpuStackSim: register not found", 0);

 }

 int FpuStackSim::get_slot(int tos_offset) const {

   return regs_at(tos_index() - tos_offset);

 }

 void FpuStackSim::set_slot(int tos_offset, int rnr) {

   set_regs_at(tos_index() - tos_offset, rnr);

 }

 void FpuStackSim::rename(int old_rnr, int new_rnr) {

   if (TraceFPUStack) { tty->print("FPU-rename %d %d", old_rnr, new_rnr); print(); tty->cr(); }

   if (old_rnr == new_rnr)

     return;

   bool found = false;

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

     assert(regs_at(i) != new_rnr, "should not see old occurrences of new_rnr on the stack");

     if (regs_at(i) == old_rnr) {

       set_regs_at(i, new_rnr);

       found = true;

     }

   }

   assert(found, "should have found at least one instance of old_rnr");

 }

 bool FpuStackSim::contains(int rnr) {

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

     if (regs_at(i) == rnr) {

       return true;

     }

   }

   return false;

 }

 bool FpuStackSim::is_empty() {

 #ifdef ASSERT

   if (stack_size() == 0) {

     for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {

       assert(regs_at(i) == EMPTY, "must be empty");

     }

   }

 #endif

   return stack_size() == 0;

 }

 bool FpuStackSim::slot_is_empty(int tos_offset) {

   return (regs_at(tos_index() - tos_offset) == EMPTY);

 }

 void FpuStackSim::clear() {

   if (TraceFPUStack) { tty->print("FPU-clear"); print(); tty->cr(); }

   for (int i = tos_index(); i >= 0; i--) {

     set_regs_at(i, EMPTY);

   }

   _stack_size = 0;

 }

 intArray* FpuStackSim::write_state() {

   intArray* res = new intArray(1 + FrameMap::nof_fpu_regs);

   (*res)[0] = stack_size();

   for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {

     (*res)[1 + i] = regs_at(i);

   }

   return res;

 }

 void FpuStackSim::read_state(intArray* fpu_stack_state) {

   _stack_size = (*fpu_stack_state)[0];

   for (int i = 0; i < FrameMap::nof_fpu_regs; i++) {

     set_regs_at(i, (*fpu_stack_state)[1 + i]);

   }

 }

 #ifndef PRODUCT

 void FpuStackSim::print() {

   tty->print(" N=%d[", stack_size());\

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

     int reg = regs_at(i);

     if (reg != EMPTY) {

       tty->print("%d", reg);

     } else {

       tty->print("_");

     }

   };

   tty->print(" ]");

 }

 #endif