1 /* 2 * Copyright (c) 2005, Oracle and/or its affiliates. All rights reserved. 3 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. 4 * 5 * This code is free software; you can redistribute it and/or modify it 6 * under the terms of the GNU General Public License version 2 only, as 7 * published by the Free Software Foundation. 8 * 9 * This code is distributed in the hope that it will be useful, but WITHOUT 10 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 11 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License 12 * version 2 for more details (a copy is included in the LICENSE file that 13 * accompanied this code). 14 * 15 * You should have received a copy of the GNU General Public License version 16 * 2 along with this work; if not, write to the Free Software Foundation, 17 * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. 18 * 19 * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA 20 * or visit www.oracle.com if you need additional information or have any 21 * questions. 22 * 23 */ 24 25 // Simulates the FPU stack and maintains mapping [fpu-register -> stack offset] 26 // FPU registers are described as numbers from 0..nof_fpu_regs-1 27 28 class Compilation; 29 30 class FpuStackSim VALUE_OBJ_CLASS_SPEC { 31 private: 32 Compilation* _compilation; 33 int _stack_size; 34 int _regs[FrameMap::nof_fpu_regs]; 35 36 int tos_index() const { return _stack_size - 1; } 37 38 int regs_at(int i) const; 39 void set_regs_at(int i, int val); 40 void dec_stack_size(); 41 void inc_stack_size(); 42 43 // unified bailout support 44 Compilation* compilation() const { return _compilation; } 45 void bailout(const char* msg) const { compilation()->bailout(msg); } 46 bool bailed_out() const { return compilation()->bailed_out(); } 47 48 public: 49 FpuStackSim(Compilation* compilation); 50 void pop (); 51 void pop (int rnr); // rnr must be on tos 52 void push(int rnr); 53 void swap(int offset); // exchange tos with tos + offset 54 int offset_from_tos(int rnr) const; // return the offset of the topmost instance of rnr from TOS 55 int get_slot(int tos_offset) const; // return the entry at the given offset from TOS 56 void set_slot(int tos_offset, int rnr); // set the entry at the given offset from TOS 57 void rename(int old_rnr, int new_rnr); // rename all instances of old_rnr to new_rnr 58 bool contains(int rnr); // debugging support only 59 bool is_empty(); 60 bool slot_is_empty(int tos_offset); 61 int stack_size() const { return _stack_size; } 62 void clear(); 63 intArray* write_state(); 64 void read_state(intArray* fpu_stack_state); 65 66 void print() PRODUCT_RETURN; 67 };