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1 /*
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2 * Copyright 2005 Sun Microsystems, Inc. All Rights Reserved.
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3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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4 *
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5 * This code is free software; you can redistribute it and/or modify it
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6 * under the terms of the GNU General Public License version 2 only, as
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7 * published by the Free Software Foundation.
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8 *
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9 * This code is distributed in the hope that it will be useful, but WITHOUT
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10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
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11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
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12 * version 2 for more details (a copy is included in the LICENSE file that
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13 * accompanied this code).
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14 *
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15 * You should have received a copy of the GNU General Public License version
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16 * 2 along with this work; if not, write to the Free Software Foundation,
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17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
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18 *
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19 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
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20 * CA 95054 USA or visit www.sun.com if you need additional information or
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21 * have any questions.
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22 *
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23 */
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24
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25 // Simulates the FPU stack and maintains mapping [fpu-register -> stack offset]
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26 // FPU registers are described as numbers from 0..nof_fpu_regs-1
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27
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28 class Compilation;
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29
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30 class FpuStackSim VALUE_OBJ_CLASS_SPEC {
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31 private:
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32 Compilation* _compilation;
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33 int _stack_size;
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34 int _regs[FrameMap::nof_fpu_regs];
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35
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36 int tos_index() const { return _stack_size - 1; }
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37
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38 int regs_at(int i) const;
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39 void set_regs_at(int i, int val);
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40 void dec_stack_size();
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41 void inc_stack_size();
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42
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43 // unified bailout support
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44 Compilation* compilation() const { return _compilation; }
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45 void bailout(const char* msg) const { compilation()->bailout(msg); }
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46 bool bailed_out() const { return compilation()->bailed_out(); }
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47
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48 public:
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49 FpuStackSim(Compilation* compilation);
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50 void pop ();
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51 void pop (int rnr); // rnr must be on tos
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52 void push(int rnr);
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53 void swap(int offset); // exchange tos with tos + offset
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54 int offset_from_tos(int rnr) const; // return the offset of the topmost instance of rnr from TOS
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55 int get_slot(int tos_offset) const; // return the entry at the given offset from TOS
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56 void set_slot(int tos_offset, int rnr); // set the entry at the given offset from TOS
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57 void rename(int old_rnr, int new_rnr); // rename all instances of old_rnr to new_rnr
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58 bool contains(int rnr); // debugging support only
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59 bool is_empty();
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60 bool slot_is_empty(int tos_offset);
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61 int stack_size() const { return _stack_size; }
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62 void clear();
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63 intArray* write_state();
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64 void read_state(intArray* fpu_stack_state);
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65
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66 void print() PRODUCT_RETURN;
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67 };
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